Clean Coal Technology

2018年S2期目次

Study on measures for preventing crushing of steam coal
WU Yaozu;CHEN Fan;Shendong Coal Preparation Center;
In order to reduce the crushing of block coal in the process of washing and transporting and to further improve the benefit of coal enterprises,the key factors affecting the crushing of block coal in the whole operation process of coal washing and processing were studied through mechanical analysis.The mechanism of impact velocity and impact time between coal particles in the process of block coal crushing was expounded.Based on the analysis of the whole process of bulk coal washing and shipping,the corresponding anti-crushing solution was put forward.The results show that the whole technological process combined with block coal crushing prevention technology can effectively reduce the limiting rate of thermal coal products and obtain considerable economic benefits.
2018 S2 v.24 [Abstract][OnlineView][Download 729K]

Combustion mechanism of pulverized coal injection by lanthanum oxide enhanced blast furnace
QIAO Junqiang;LI Yanjiang;Coal Quality Technology Department,Coal Distribution Center,Shendong Coal Group;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing;
Lanthanum oxide( La2 O3) has excellent chemical catalytic performance.The combustion mechanism of La2 O3 on coal powder was studied by using pulverized coal from a blast furnace production site as raw material. The high temperature and high pressure pulverized coal combustion device was used to simulate the combustion conditions of the blast furnace tuyere in the blast furnace.The pulverized coal combustion rate test was conducted and the unburned carbon residue was collected. The unburned carbon was analyzed by SEM,and the thermal weight-differential thermal analysis was used to analyze the coal by La2 O3.The results show that the combustion rate of pulverized coal is obviously improved after adding La2 O3.When the amount of La2 O3 is 1.5%,the burning rate of pulverized coal is increased by 12.33%.At this time,the average particle size of unburned carbon residue is larger than that of unburned carbon residue of raw coal.The average particle size is reduced by 14.5 μm and the appearance is extremely irregular.La2 O3 forms transient metal oxide La3+( CO-)3 on the surface of pulverized coal fixed carbon,weakens the bridge bond between carbon molecular structural units,improves the reaction rate of pulverized coal particles,promotes the early release of volatiles,and significantly improves coal. The combustion reactivity of the powder particles improves the combustion efficiency of the coal powder.
2018 S2 v.24 [Abstract][OnlineView][Download 1008K]

Optimization design and practice of quality improvement and efficiency enhancement process for end coal system
NIU Chao;Shendong Coal Preparation Center;
In order to solve the problem that the low efficiency of dehumidification of the coal system at the end of Wulanmulun coal preparation plant lead to the high pressure of the coal mud water system and the spiral separator often block the large block,which lead to the high failure rate of the equipment,a new type of sieve plate,castor crude device and water flushing device were independently researched and developed.Through the comprehensive application of the new process,the dehumidification efficiency of the last coal dredge is increased by 15%,the production efficiency is increased by 1.4%,the pressure of the coal mud water system is reduced,and the efficient and continuous benign operation of the washing system is guaranteed.
2018 S2 v.24 [Abstract][OnlineView][Download 993K]

Evaluation of production process in the southern part of Baode coal preparation plant
SHI Yawen;Shendong Coal Preparation Center;
The deterioration of raw coal quality,high content of gangue and the serious mud phenomenon has lead to separation system unable to effectively meet the production demand in the southern part of Baode coal preparation plant.Industrial analysis,sliming test and sieving floatation and sinking test of raw coal in southern area of Baode coal preparation plant were analysed,and separation process of lump coal,end coal,gangue re-separation,coarse slime and flexibility of production system were evaluated.Optimization suggestions for production system design was put forward. The raw coal has many fine materials and poor washability. Therefore,the lump coal is separated by shallow groove with heavy medium,and the final coal is separated by heavy medium cyclone,which fully meets the requirement of separation particle size.The heavy medium cyclone is used for the gangue reelection process.The clean coal is most sorted by the combination of water medium cyclone and spiral separator.Aiming at the phenomenon of gangue mudding in the raw coal in the southern part of Baode coal preparation plant,the desliming process of gangue is added,which can effectively reduce the medium loss and production cost,and realize the density stability of the gangue re-separation system.
2018 S2 v.24 [Abstract][OnlineView][Download 1119K]

Research on new additive process in coal-to-oil coal preparation plant
LI Peng;CHEN Xu;Shendong Coal Preparation Center;
In view of the problems existing in the traditional additive process of power coal preparation plant,a new additive process-dense medium system was developed through combination with the actual situation of Shendong coal-to-oil coal preparation plant.The automatic upgrading of additive system was carried out,and transformation effect was analyzed.A strong barrel is installed above the joint barrel,and the pipe is installed at the bottom of the dense barrel to the barrel.Proportional control valve is installed in the root canal of dense medium barrel.The liquid level sensor is installed in 1355 dense medium barrel,and the automatic control is realized by detecting the dense medium barrel,liquid level and density.Practice has proved that the automatic control system runs reliably,shortens the adjusting time of medium density,improves the production efficiency and stabilizes the quality of product clean coal.The annual output of coal preparation plant is4 million tons.After the transformation in 2017,the medium is saved by 1 120 tons compared with 2016.The total annual cost of the transformation for dense medium system is about 1.05 million yuan.The application of dense medium system in coal preparation plant optimizes human resources,reduces the labor intensity of employees,reduces the consumption of medium,improves the automation level of production system,stabilizes the quality of coal products,and provides users with better products.
2018 S2 v.24 [Abstract][OnlineView][Download 1155K]

Analysis of influencing factors for coal slurry treatment and recovery and transformation in Buertai coal preparation plant
MA Wenjie;Buertai Coal Preparation Plant,Shendong Coal Preparation Center;
Aiming at the problems existing in coal slurry water treatment system and operation of Buertai coal preparation plant,effect of coal slurry characteristics on each link of coal slurry water treatment system was analysed,and the problems existing in combined recovery concentrate underflow process with pressure filter,plate-frame filter and sedimentation filter centrifuge in Buertai coal preparation plant were analyzed.Effect of each link in process of coal slurry recovery was adjusted,and improvement suggestions was put forward.After transformation,coal slurry treatment and recovery equipment is effectively adapted to the changes of coal quality and meets the production requirements.The discharging time of pressure filter is shortened by nearly 200 s,which greatly improves coal slurry recovery efficiency.
2018 S2 v.24 [Abstract][OnlineView][Download 1092K]

Pilot test on fine coal flotation of low rank power coal
ZHANG Jiabin;Shendong Coal Preparation Center;
In order to realize high value-added utilization of low rank slime,aiming at the problems of high ash content,high sulphur content and low value of slime in Buertai coal preparation plant,pilot test on flotation feasibility of fine slime was carried out to verify the actual separation effect of fine slime at industrial level,the consumption of reagents and the unit processing capacity,etc.The dewatering effect of flotation concentrate filter press and pressure filter were investigated.Direct flotation test shows that the slurry water runs roughly in the final coal system,accounting for a high proportion of less than 0.045 mm. The ash content of feed,clean coal and tailings are 20. 19%,5. 30% and 58.53%,respectively,and yield of clean coal is 72.03%.Pilot flotation column has good effect on direct flotation of coal slurry water in block end system. Thickening flotation test shows that slurry water in lump coal system can be effectively concentrated by deep cone concentrator,with feed concentration of 2. 13%,underflow concentration of 6. 57%,overflow concentration of 0. 20%,feed ash of31. 31%,flotation concentrate ash of 7.09%,flotation tailings ash of 76.83%,and flotation effect is good.Direct flotation test of slurry water shows that the ash content of flotation feed,concentrate,tailings are 27.79%,7.43% and 77.83%,respectively,and the yield of clean coal is 71.88%.Compared with pilot direct flotation and concentration flotation,concentration flotation has high flotation concentration and low medicament consumption.
2018 S2 v.24 [Abstract][OnlineView][Download 1246K]

Analysis of the cause of steel structure corrosion in coal preparation plant
WANG Zhenlong;BAI Feifei;Shendong Coal Preparation Center;Branch Institute of Mine Oil Products,China Coal Research Institute;
In order to find out the reason of steel structure corrosion in the workshop of Shendong coal preparation center,the changes of water quality,including electrical conductivity,p H,hardness and corrosion ion,were detected and analyzed.Based on the surface and quality changes of No.45 carbon steel in different corrosion solution,the influence of various corrosion factors on the corrosion of steel structure was studied and compared.The influence of temperature and humidity on the corrosion of steel structure was studied by measuring and comparing the temperature and humidity of different working areas in the workshop of coal preparation plant.The results show that the corrosion of steel structure in coal preparation plant is caused by many factors.The content of chloride ion and sulphate ion in water is high,and the average content is 391 mg/L.The measured temperature is 20-35 ℃ and the humidity is 80 ℃.This temperature and humidity accelerate the corrosion of steel structure.Controlling the temperature,humidity and the concentration of corrosion ion in water are the main measures to solve the corrosion of steel structure.
2018 S2 v.24 [Abstract][OnlineView][Download 1424K]

Feasibility study on synergistic transformation of coking coal blending in Baode coal preparation plant
ZHANG Jiabin;ZHU Ziqi;Shendong Coal Preparation Center;
In order to realize rational and optimal allocation of coal resources,aiming at the problems of simple process and single product in Baode coal preparation plant,the indexes of clean coal and the washability of raw coal were studied,and feasibility and effect of technological transformation were analysed.The results show that 8-1 raw coal belongs to gas coal with high metamorphic degree.Clean coal can meet the target requirements of coking coal blending,maximize the added value of coal products,and achieve the rational allocation of resources through coal separation. Selection of scheme 1 can improve by 175 million yuan per year efficiency. Compared with the existing mode,it has little influence on the system,and can easily restore the status quo after the transformation.The sorting system is flexible,and the production mode can be adjusted at any time.
2018 S2 v.24 [Abstract][OnlineView][Download 1360K]

Study on screening efficiency detection method of double-layer raw coal grading sieve
ZHOU Ruitong;Coal Quality Regulating Department,Shendong Coal Preparation Center;
Based on the fixed position of the double-layer raw coal grading screen used in the coal preparation plant,the space is limited.In the process of detecting the screening efficiency,there is a problem that the sampling point is far away from the screening machine or some data can not be obtained by sampling to obtain the screening data.The relationship between the comprehensive separation index and the screening efficiency was discussed.The theoretical error of screening efficiency was discussed.The difficulty of detecting the screening efficiency of the double-layer raw coal grading sieve in specific environment was analyzed,and the concept of breaking rate was introduced to determine the fracture.The test scheme of breaking rate was obtained.By correcting raw coal screening data and combined with the actual material amount of the graded sieve products,calculation method for estimating the screening efficiency of double-layer sieve is obtained.According to the screening test results of the double-layer relaxation sieve of the Halagou coal preparation plant,the calculation method can estimate the screening efficiency.
2018 S2 v.24 [Abstract][OnlineView][Download 1405K]

Effect of reagent selection on sedimentation performance of coal slime water
PAN Yuejun;Coal Preparation Center,Shendong Coal Group Co.,Ltd.;
In order to study the influence of different polymer flocculants and coagulants on the settlement performance of coal slime water in coal preparation plant,based on coal slime water in Bulianta coal preparation plant,effect of different reagent selection,ratio of reagents and reagent dosage on coal slime water settlement were studied.Results show that coal slime water settlement effect is better when the anionic polyacrylamide A100( imported coagulant) is used.The coal slime water settling speed is 116.13 mm/s,the clarification layer has low turbidity,and the coal slime is easy to dehydrate.Medicine cost is saved 1.282 yuan/t with A100,when gangue is muddy.
2018 S2 v.24 [Abstract][OnlineView][Download 1383K]

Experimental study on industry gasification of lump coal from Shendong mining area
WANG Zhenfei;LI Chenguang;Shendong Coal Distribution Center,Coal Group;School of Chemical Engineering & Technology,China University of Mining and Technology;
In view of"thinning,slagging"and large bed resistance of gasifier with low ash melting temperature coal in Shendong mining area,the gasification test of the Zhun lump coal in the Daliuta ore coal of Shendong mining area was carried out in four different proportions of 20%,30%,40% and 50%.The changes of blast pressure,gas composition,calorific value,coal consumption and gas yield were studied.The results show that quality of raw coal gasified with different proportions has little change with that without coal blending,but coal blending makes the gasification process go on smoothly,reduces the blast pressure at the bottom of the furnace,reduces the power consumption,and thus saves the cost.Four blending ratios of comprehensive gas production and gas quality can meet the production needs.Ash discharge of blending ratio 50% is larger,and coal cost reduction of blending ratio 20% is small due to small proportion of Zhun lump coal blending.Ash discharge of blending ratio 30% and 40% are in acceptable range that is better blending ratio.
2018 S2 v.24 [Abstract][OnlineView][Download 1610K]

Control of coarse slime dewatering process in final coal system of Daliuta coal preparation plant
KANG Xuegang;WANG Xiaoping;LYU Hongguang;BAI Jing;Daliuta Coal Preparation Plant,Shendong Coal Preparation Center;
In order to reduce the influence of coarse coal slime water on coal quality and coal preparation plant profit,effect of bottom diameter of secondary hydrocyclone,cyclone sieve bend angle,cyclone sieve seam,centrifuge seam,centrifuge condition check on the coarse coal slime product dehydration.The results show that in the tailings coal system of Daliuta coal preparation plant,bottom diameter of secondary hydrocyclone decreases from 90 mm to 75 mm,and the crude slime moisture decreases by 2.2% simultaneously.The mesh of cyclone sieve is increased from 0.35 mm to 0.5 mm,and the moisture of coarse coal mud decreases by 1.45%.The seam of coarse slime centrifuge increases from 0.35 mm to 0.5 mm,and the crude coal moisture decreases by 0.91%.
2018 S2 v.24 [Abstract][OnlineView][Download 1424K]

Research on demand oriented production optimization of Bulianta coal preparation plant
WANG Bin;ZHU Ziqi;Bulianta Coal Preparation Plant,Shendong Coal Preparation Center;Shendong Coal Preparation Center;
Acording to the change of raw coal quality in Bulianta coal preparation plant and the requirement of market for products,the existing production organization and market demand of Bulianta coal preparation plant were discussed. The system feasibility and economic benefit of the coal preparation plant were analyzed,and the production organization mode was determined.Results show that the best production mode are 25 mm classification,lump coal into the separation,all the final coal into the separation of 1-2 coal and 50 mm classification,lump coal into the separation,the final coal of 2-2 coal,which can increase profits by 29.67 million yuan and increase the selection rate by 30%.Through demand oriented production organization optimization,products meet market demand.At the same time,it can reduce the waste of product quality and cost,and ensure the maximum profit of coal preparation plant.
2018 S2 v.24 [Abstract][OnlineView][Download 1490K]

Optimization of production system in coal-to-oil coal preparation plant
HE Chuangku;SUN Guoxing;ZHANG Junjie;Coal-to-Oil Coal Preparation Plant,Shendong Coal Preparation Center;
In order to solve a series of problems caused by a large amount of secondary slime produced in the crushing process,the slime system was optimized on the basis of the existing production technology of Shendong coal-to-oil coal preparation plant.The effects of segmental modification of raw coal grading screen,replacement of duckbill desliming nozzle and use of new medicament on coal slurry production system were analysed.The results show that the amount of coal slime is reduced by about 16 000 tons per month,the daily operation time of the slime system is reduced by more than 6 hours,the coal medium consumption of washing ton is reduced from 1.35 kg/t to 0.87 kg/t,and the electricity consumption is reduced from 1.57 yuan to 1.43 yuan. It can increase economic benefit by more than 30 million yuan each year,and enhances the adaptability of the production system to the coal quality of raw coal.
2018 S2 v.24 [Abstract][OnlineView][Download 1558K]

Feasibility analysis of 4^-3 coal separation in Yujialiang coal preparation plant
TIAN Yanfeng;Shendong Coal Preparation Center;
In order to improve coal separation efficiency and product quality,aiming at the coal quality characteristics of 4~(-3) coal,the problems of blending 4~(-3) coal were analyzed,and optimization transformation and transformation effect were carried out.In view of high proportion of 4~(-3) coal slime and easy sliming characteristics,by changing storage form of raw coal into warehouse and analysing four main links of raw coal proportioning,screening efficiency,coal slime system and product into warehouse,4~(-3) coal is transformed from direct production to normal production,and 4~(-3) and 5-2 coal blending realize maximum selection with combination of proportioning and interval selection. The annual profit index is changed from loss of 102 million yuan to profit of 88.02 million yuan,and the profit maximization is realized.
2018 S2 v.24 [Abstract][OnlineView][Download 1591K]

Research on undrained magnetic separation technology in waste medium
ZHANG Shuai;Shendong Coal Preparation Center;
Aiming at the problems of high ash fine slime back blending mixed coal caused to secondary pollution to blended coal quality,increasing drug consumption and reducing separation accuracy in Ulanmulun coal preparation plant,dilute medium magnetic separation technology was analysed. Undrained magnetic separation technology in waste medium was studied and applied,and application effect of technology was anaylsed.The waste slurry can be separated from coal slurry products in time by undrained magnetic separation technology in waste medium,which shortens the residence time of waste slurry in coal slurry water system,reduces the ash content of fine coal slurry by 1%,effectively reduces reagents consumption,and strengthens the sedimentation effect of coal slurry water.After modification,the calorific value of blended coal increases by 54 k J/kg due to the reduction of ash content,and the economic benefit increases by 5.2 million yuan.The cation and anion consumption per ton of coal decrease by 10 g and 3 g,respectively,and the reagent cost is saved by 166 thousand yuan.
2018 S2 v.24 [Abstract][OnlineView][Download 1584K]

Study on flotation technology of low rank coal
CHEN Jianjun;ZHONG Shigang;Buertai Coal Preparation Plant,Shendong Coal Preparation Center;
Because of high gangue content of raw coal,the gangue in Buertai coal preparation plant is easy to slime,which makes coal slurry water difficult to settle and seriously restricts the capacity of final coal system.Aiming at the properties of raw coal in Buertai area,the slurry flotation was carried out by using newly developed special low rank slurry flotation collector and cyclone-static micro-bubble flotation column which belong to China University of Mining and Technology.By analyzing the properties of flotation clean coal,the possible ways of high-quality low-ash fine-grained coal development and utilization in the future were studied.The semi-industrial test shows that the better flotation effect can obtained with clean coal ash of 7.30%,tailings ash of 78.55% and recovery of combustible product of 89.13%,when the collector consumption is 2.5-3.0 kg/t.coal slurry has less mineral composition,finer particle size and higher calorific value after flotation.It can be used not only as power coal for power generation,but also as high-quality coal chemical raw material.The use of coal slurry has been broadened,and its utilization value has increased.
2018 S2 v.24 [Abstract][OnlineView][Download 1659K]

Experimental study on sedimentation characteristics of slime water in the Bulianta coal preparation plant
WANG Bin;SHANG Ming;ZHAO Huanyu;HAO Guoqing;YUAN Xiaoxia;Bulianta Coal Preparation Plant,Shendong Coal Preparation Center;Shendong Coal Preparation Center;
In order to solve the problem of settling the coal slime water,taking 1-2 coal slime water in Bulinta coal preparation plant as the research object,the coal quality characteristics and physicochemical properties of the coal slurry were analyzed,and the selective tests of coagulant and flocculant were carried out by single factor analysis method.The results show that the slurry has good settling effect with magnesium chloride as coagulant and anionic AL9020 as flocculant.The optimum experimental conditions is as follows: magnesium chloride/anionic AL9020 = 4 ∶ 0.6( volume ratio) after single factor selection of coagulant and flocculant.
2018 S2 v.24 [Abstract][OnlineView][Download 1844K]

Design and application of raw coal sampling machine under scraper conveyor
JIANG Shuijun;Coal Distribution Center,Shendong Coal Group;
In order to solve the problems existing in the process of raw coal sample preparation in Shendong coal group company,through field investigation in several coal preparation plants,it was determined that the cut-off section of screen scraper conveyor was adopted in the screening workshop of coal preparation plant,and a complete set of " under scraper conveyor of coal preparation plant" was formed by combining with automatic control of the system and other means.Square raw coal sampling and sample machine.The breakthrough of artificial sampling for automatic sampling of raw coal machinery was realized,and the next improvement plan was proposed.
2018 S2 v.24 [Abstract][OnlineView][Download 1717K]

Measures for improving maintenance efficiency and quality of centrifuge in coal preparation plant
GAO Wenge;Shendong Coal Preparation Center;
After vibrating discharge centrifuge is installed and operated for a period of time,problems such as abnormal start-up,bearing damage,abnormal vibration and oil leakage often occur,which seriously affect the normal production of coal preparation plant.Based on the working principle of vibrating discharge centrifuge and fault analysis,measures to improve the maintenance efficiency and quality of centrifuge were analyzed from three aspects of personnel,equipment and management.By improving special tooling for dismantling screen basket,dismantling and assembling tool for disc spring lock mother,disassembling special tooling for buffer sleeve,dismantling and assembling special tooling for exciting beam,changing inner wall of centrifuge tank from ceramic block to rubber plate and changing hard anti-wear to soft contact,and improving the management of centrifuge maintenance,maintenance efficiency and quality of centrifuge are improved effectively.
2018 S2 v.24 [Abstract][OnlineView][Download 1767K]

Use status and rectification plan of online ash meter
YE E;Shendong Coal Preparation Center;
In order to solve the problem that online ash meter can't adjust production parameters accurately,the current situation of nline ash meter was analyzed.Combined with the management mode of Shendong Coal Group Co.,Ltd.,the principle and working conditions of online ash meter were studied,and corrective measures in terms of management and technological transformation were proposed.The results show that after revising the system and strengthening the management,the calibration number of the online ash meter is obviously increased,and calibration content is further enriched,which can be calibrated in time.The double source separation is transformed into double source overlapping type,and single-point ash measurement is changed into multi-point ash measurement,which make accuracy of online improve and realize the adjustment of separation density and other production parameters according to the ash change displayed by online ash meter.
2018 S2 v.24 [Abstract][OnlineView][Download 1656K]

Application of automatic monitoring and control of ultra low ash coal production in Bulianta coal preparation plant
TIAN Baoxiong;WANG Bin;Dispatching Center,Shendong Coal Preparation Center;Bulianta Coal Preparation Plant,Shendong Coal Preparation Center;
In order to meet the needs of coal market and customers for coal products,the cause of instability of qualified rate of ultra-low ash coal in Bulianta coal preparation plant was studied.Based on the single factor solution to the existing problems,an automatic monitoring and control scheme for the production of ultra-low ash coal in Bulianta coal preparation plant was proposed.The results show that the automatic monitoring and control system for the production of ultra-low ash coal is effective in controlling the production process of ultra-low ash coal.The qualified rate of the product exceeds 98%,and the economic benefit is increased by more than 8 million yuan.
2018 S2 v.24 [Abstract][OnlineView][Download 1643K]

Study on alternative application of imported weighing secondary instrument integrator
LI Tongpo;Shendong Coal Preparation Center;
In order to solve the problem of high failure rate of imported weighing secondary instrument totalizer used in equipment such as belt weighing,weighing bin,screw feeding weighing,quantitative stirring weighing and filling in industrial and mining enterprise production system,it is not suitable for repair after damage,and the cost is expensive,there are various drawbacks such as the use,maintenance,complicated calibration operation,high cost of spare parts procurement,long cycle,etc.After conducting in-depth research on the above-mentioned problem symmetric weight equipment,an alternative scheme is proposed,which is adopted in the belt scale.The weighing sensor is installed at the bottom of the weighing chamber,the spiral feeding scale,the quantitative stirring weighing and the like,and the pressure voltage signal is filtered and transmitted to the analog input end of the central processing unit CPU( small central computing unit or single chip module),and processed by the central processing unit. The unit( CPU) performs weighing and calibration algorithm operation processing,simplifies the hardware composition,and finally realizes functions such as automatic calibration,weighing operation,data conversion,and data output.According to the successful implementation of the alternative method of the imported weighing and weighing instrumentation totalizer in the production system of Daliuta Coal Preparation Plant and obtained the national patent,the results show that the research results can completely replace the current belt weigh,weighing bin,spiral The weighing system for the imported weighing and weighing secondary instrument accumulator with high failure rate in the equipment of weighing,quantitative stirring and weighing irrigation.This paper elaborates on the hardware composition,function and characteristics of the scheme.
2018 S2 v.24 [Abstract][OnlineView][Download 1896K]

Study on automatic switching transformation of production system in Shangwan coal preparation plant
WANG Cheng;WANG Anjia;XUE Hongwei;Shendong Coal Preparation Center;
In order to solve the problems of slow switching speed of production system and unclear mode of production in Shangwan coal preparation plant,the main production methods according to the requirements of production needs and intelligent construction were summarized,and reformed the key gates in the production system. A small model of production system was established by taking the action of sluice plate and supporting hydraulic station and the starting and stopping of process system under the corresponding production mode into a logical locking relationship.The results show that the technical transformation can achieve the purpose of automatic switching and energy saving and consumption reduction of the production system.
2018 S2 v.24 [Abstract][OnlineView][Download 1819K]

Innovative practice of online grain size detection in Shangwan coal preparation plant
SU Cuihua;Shendong Coal Preparation Center;
In order to reduce the risk of coal quality accident caused by particle size exceeding the standard in the production process of coal preparation plant,the requirements of material size control for intermediate products or final products in each production link of Shangwan coal preparation plant was studied,and a method to realize on-line particle size detection by means of automation was put forward: An automatic on-line particle size detection device was developed. After parctical application of 251 mixing coal belt conveyor in Shangwan coal preparation plant,mixing rate exceeding the upper limit caused by coal accident is not occured.The results show that through the above innovative practices,the limitation and lag of traditional screening test method and artificial experience judgment method in judging material particle size exceeding the limit are broken,the labor intensity of coal preparation plant staff is reduced,and the coal quality index of commercial coal is improved.
2018 S2 v.24 [Abstract][OnlineView][Download 1829K]

Application of DF-5753D multi-point online ash meter in Shangwan coal preparation plant
ZHANG Xinyuan;WANG Zhenlong;Shendong Coal Preparation Center;
In order to improve the detection accuracy of commercial coal,timely guide the production of clean coal,and solve the problems existing in the detection of clean coal ash in the Shangwan coal preparation plant with the existing ash analyzer,a DF-5753 D multi-point online ash analyzer was selected.The application performance of the ash analyzer in the clean coal ash detection of Shangwan coal preparation plant was analyzed.The results show that the equipment can continuously detect the clean coal ash data with small error.The variance and tandard deviation was 0.188 9 and 0.366 4,respectively,with the average deviation of 0.The ideal application performance indicated that DF-5753 D multi-point online ash analyzer can effectively guide the production operation of the coal preparation plant.
2018 S2 v.24 [Abstract][OnlineView][Download 1986K]

Application of dust suppression agent automatic spraying system in Shigetai coal preparation plant
BAI Long;ZHAO Xinglei;Shigetai Coal Preparation Plant,Shendong Coal Preparation Center;
In order to improve the dust-reducing effect of coal transportation and improve the utilization efficiency of dust suppressant,an automatic spraying system for dust suppressant was developed and designed in Shijietai coal preparation plant,which realized automatic spraying of dust suppressant,and has spray flow and spray pressure.The feedback adjustment control automatic control function greatly improves the spray quality.The waste liquid recovery system and the cleaning system were designed to realize the waste liquid recycling and automatic cleaning function.
2018 S2 v.24 [Abstract][OnlineView][Download 2023K]

Optimization and practice of loading system in Bulianta coal preparation plant
GAO Jian;WANG Bin;DANG Yuanyuan;Bulianta Coal Preparation Plant,Shendong Coal Preparation Center;
In order to solve the problem of network impassability caused by the unit merging in the loading system of Bulianta coal preparation plant,the solution of single factor was adopted,the optimization of industrial control network,the optimization of equipment protection and the treatment of deviation of belt conveyor,etc were implemented.The results show that the unified dispatching command of the loading system in the coal preparation plant is realized,the loading situation is monitored in real time,the loading efficiency,the stability of the equipment and the safety and reliability of the daily production and maintenance of the loading system are improved.The equipment failure rate and fault handling time are reduced,and the annual cost can be saved more than 3 million yuan.
2018 S2 v.24 [Abstract][OnlineView][Download 1873K]

Analysis and treatment of common electrical faults in large coal preparation plants
LIU Feng;Bulianta Coal Preparation Plant,Shendong Coal Preparation Center;
In order to solve the problems of low efficiency of equipment operation caused by electrical faults in modern large-scale coal preparation plants,the common electrical faults in large scale coal preparation plants were analyzed by statistics and classification.,and the solution was put forward.The solutions effectively reduce the electrical failure rate.The methods to reduce the fault rate and affect the time management of the coal preparation plant was put forward,to further optimize the equipment performance and to improve the operation efficiency of the equipment in the coal preparation plant.
2018 S2 v.24 [Abstract][OnlineView][Download 1895K]

Improvement measures for inlet and exhaust air of compressor in coal preparation plant
WANG Pengfei;Shendong Coal Preparation Center;
In order to reduce the failure shutdown rate and energy consumption of low pressure fan in coal preparation plant,to raise the operation efficiency and production efficiency of high pressure fan,and to reduce the labor intensity of maintenance and repair,according to the poor intake air quality of the compressor in the actual production and operation process,the problems of high temperature fault shutdown and serious power waste were analyzed,it is concluded that improving the intake air quality of the high pressure fan is the key to ensure the normal operation of the compressor.Optimizing the intake and exhaust air pipe,controlling the starting and stopping mode can improve the production efficiency and save energy and reduce the consumption.Therefore,suggestions for improvement were put forward.The results of practical retrofit show that the optimized compressor has a remarkable improvement in operation,production efficiency,failure reduction and energy saving and consumption reduction,and the effect is obvious.
2018 S2 v.24 [Abstract][OnlineView][Download 1990K]

Research and practice of water reuse technology for plate and frame filtrate
NIU Chao;Shendong Coal Preparation Center;
In order to solve the problems of abundant water in production system of short service life of pump seal and large corrosion degree of equipment in Wulanmulun coal preparation plant,the plate and frame filtrate water were used instead of replenishing clean water and circulating water to improve the water quality.The service life of pump seal is prolonged and the corrosion rate of equipment is effectively alleviated,which ensures the realization of closed circuit circulation of washing water system in coal preparation plant.
2018 S2 v.24 [Abstract][OnlineView][Download 1914K]

Measures on reducing medium consumption in Shangwan coal preparation plant
ZHOU Zenghong;Shangwan Coal Preparation Plant,Shendong Coal Preparation Center;
In order to solve the problem of high medium consumption in Shangwan coal preparation plant,the causes of medium consumption were analyzed from two aspects of medium management loss and technical loss,and corresponding modification measures were put forward.Coal preparation plant are reformed by reducing coal block entering medium system,reforming addition mode,shunt adjustment,magnetic separation feeding,scraper modification and optimizing medium consumption management.After modification,the consumption of medium consumption is dropped from 0.6 kg/t to 0.52 kg/t.
2018 S2 v.24 [Abstract][OnlineView][Download 1888K]

Measures to reduce power consumption in coal-to-oil coal preparation plant
LI Peng;LI Hui;Shendong Coal Preparation Center;
Aiming at the problem of high power consumption in coal-to-oil coal preparation plant,the key measures were implemented by controlling and reforming the production links of coal preparation plant.The power consumption of coal preparation plant has been greatly reduced by shortening the start-up and shutdown time of whole system,optimizing the withdrawal of high-power equipment,retrofitting screening crusher,raw coal pre dedust and coal barrel self overflow,and optimization of start-up for pressure filtration system.The annual cost of electricity,materials and labor can be saved about 3.45 million yuan.At the same time,the quality of commercial coal has been further improved.
2018 S2 v.24 [Abstract][OnlineView][Download 1912K]

Effect of magnetic separator recovery rate on medium consumption in coal preparation plant
SU Jian;HE Chuangku;WANG Fangxia;WU Kui;YANG Zhen'e;Shendong Coal Preparation Center;
In order to improve the recovery rate and recovery effect of magnetic separator in coal preparation plant,the technological effect of magnetic separator recovery rate was analyzed and evaluated.The medium content of coal preparation intermediate product was tested,and the cause of medium loss was analyzed. Effect of magnetic separator recovery rate on medium recovery system was studied,and the measures to improve the recovery rate of magnetic separator and reduce medium consumption were put forward.The recovery rate of magnetic material is taken as the main evaluation index,and the removal rate of coal slime is taken as the auxiliary evaluation index to evaluate the actual application effect of a single magnetic separator.The main factors affecting the working effect of magnetic separator are feed concentration,magnetic material and slime content,magnetic declination angle,overflow weir height and scraping effect.Through reasonable selection of magnetic separation process and magnetic separator,debugging the structure and performance parameters of magnetic separator,strictly controlling the quality of medium selection,strengthening the evaluation and testing of magnetic separator process effect,improving the operation level of magnetic separator process,strengthening the daily inspection and maintenance management of magnetic separator,the recovery rate of magnetic separator can be improved,and medium consumption can be reduced.
2018 S2 v.24 [Abstract][OnlineView][Download 1893K]

Measures and analysis of power consumption reduction in coal preparation plant
ZHANG Xinming;YAN Jianhua;LIN E;Shendong Coal Preparation Center;
In order to complete the energy-saving target task of Shendong coal processing center in the 13 thFive-Year Plan and reduce the power consumption,reasons for higher electricity consumption was analyzed,and relationship between transformer load and principle,mode,sequence,time,and unit of starting and stopping for starting and stopping process of sorting system in coal preparation plant was researched.Through the above measures,the annual energy consumption index of raw coal reduces from 2.196 k Wh/t to 2.128 k Wh/t that reduces the electricity consumption by 3.2% and 12.953 2 million k Wh compared to last year.The energy saving index and power cost has dropped significantly.
2018 S2 v.24 [Abstract][OnlineView][Download 2082K]

Discussion and application of energy saving and consumption reduction in Shigetai coal preparation plant
BAI Long;CAO Xianchun;LI Peiqi;Shigetai Coal Preparation Plant,Shendong Coal Preparation Center;
In order to reduce the energy consumption of the coal preparation plant and save the production cost,the main energy consumption types and uses of the coal preparation plant was analyzed.Through theoretical research and on-site analysis,the way of energy conservation and consumption reduction were explored and the corresponding energy saving and consumption reduction were proposed. Through heating,thermal insulation system renovation,optimization and upgrading of electricity system,optimization of management system,and transformation of production water system,energy use efficiency are improved,and energy saving is achieved.
2018 S2 v.24 [Abstract][OnlineView][Download 1925K]

Research on optimization of material reserve and management in coal preparation enterprises
NAN Chaoyun;PANG Chengbin;CAO Xianchun;Shendong Coal Preparation Center;
In order to solve the problems of unscientific material reserve,low utilization rate and large capital occupation of coal preparation enterprises,the inventory status,inventory structure and spare parts consumption cycle of the existing reserve materials of coal preparation enterprises were analyzed. A series of measures such as intelligent information management,spare parts storage,system control,internal marketization and idle material transactions make the material reserve more scientificly,reasonably and standardly.The reserve amount of spare parts and overall inventory reserve have been effectively reduced by 15%,respectively,which optimize the management of material reserve management,and promote the economic benefits of coal preparation enterprises.
2018 S2 v.24 [Abstract][OnlineView][Download 1937K]

Analysis and prevention of noise pollution in coal preparation plant
MA Jinli;Shendong Coal Preparation Center;
In order to effectively reduce the noise in the workshop and the boundary of the coal preparation plant and make the noise index reach the national standard so as to reduce the harm of noise to the occupational health of the staff and the environmental pollution caused by noise discharge,the noise intensity was detected by analyzing the equipment and facilities,production technology and the environment of the plant,and the main noise to the coal preparation plant were also detected.Based on the analysis of sound sources,two noise reduction methods,noise source control and noise propagation control,were adopted.The main measures include installing shock absorber,installing sound absorption mechanism on the wall of workshop,changing ordinary doors and windows into sound insulation doors and windows,and installing sound insulation facilities at exhaust vents.Through the implementation of various measures,the results show that the noise control reaches the national standards.
2018 S2 v.24 [Abstract][OnlineView][Download 2071K]

Research on purchase inventory management in coal enterprises
XU Yan;Accounting Center,Shendong Coal Group;
Coal plays an important role in the energy structure of our country.With adjustment of energy structure,coal companies puts forward higher requirements for cost control and inventory risk management.In order to optimize purchase inventory management and solve the problem of difficult to meticulous management of purchase,optimization scheme was put forward through classifying the differences of business,comparing existing management concepts,means and methods of the same industry,and combining the practical application of ERP information system.Enterprises should make dynamic inventory equilibrium point to keep up with market changes,strengthen inventory guarantee mechanism management to strive for inventory coordination,establish warehouse age management mechanism,strengthen the optimization of the distribution of various profit centers,make full use of advantages of large data released by ERP system,establish emergency warning and emergency mechanism and other measures.It can realize scientifically manage and improve the economic benefits of enterprises.
2018 S2 v.24 [Abstract][OnlineView][Download 2024K]

Construction of safety risk precontrol management system in coal preparation plant
DU Rui;Shangwan Coal Preparation Plant,Shendong Coal Preparation Center;
In order to standardize the safety management of coal preparation plant,reduce the incidence of safety production accidents,the necessity and construction process of constructing safety risk precontrol management system in coal preparation plant were analysed.Construction process of safety risk precontrol management system in coal preparation plant includes preparation and start-up phase,basic knowledge and operation method training of safety risk precontrol,document writing and operation.It can standardize the safety management of coal preparation plant,and achieve all-round management from people,machines,rings and tubes. Hazard sources in each control link are controlled which can insure no dead angle,and realize zero loopholes in management,zero pollution in the environmentt,zero loophole of management and zero pollution of environment.
2018 S2 v.24 [Abstract][OnlineView][Download 2013K]

Comprehensive treatment of coal dust in Jinjie coal preparation plant
SUN Yadong;Shendong Coal Preparation Center;
In order to reduce the dust content in the workplace,coal dust control measures in coal preparation plant were analyzed,and effect of coal dust control was analyzed.Coal dust and physical and mental hazards of workers are reduced through optimizing production process,reforming dust removal facilities,adding new wet dust removal facilities and creating unmanned operation in Jinjie coal preparation plant.For the coal dust caused by large drop of coal flow and large wind force,it is appropriate to adopt the methods of sealing the guide trough,expanding the capacity and increasing the dust curtain to control it.Water spray and dust suppression methods should be adopted for coal dust produced by low surface moisture,coal bumps in the process of reloading and fine coal particles.After the comprehensive treatment of coal dust,the concentration of coal dust is reduced from above 30 mg/m3 to below 5 mg/m3.
2018 S2 v.24 [Abstract][OnlineView][Download 2008K]

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