2017年04期目次

  • Status and prospect of cleaning utilization of civil coal in China

    Wu Jianjun;Guo Fanhui;Sun Shaojie;Dong Jixiang;Jiang Yao;Zhang Yixin;School of Chemical Engineering & Technology,China University of Mining and Technology;National Engineering Research Center of Coal Preparation and Purification,China University of Mining and Technology;

    Origin and current situation of civil coal in China was discussed.The effects of characteristics of civil coal types and forms and combustion technologies on the pollutant emission were analyzed. Based on research status,the civilian coal clean utilization technologies were summarized from 3 aspects: pre-combustion processing,combustion technology and post-processing. The recommendations of civil coal clean utilization are proposed.The briquette with high sulfur retention rate should be developed based on the mechanism and influencing factors of sulfur retention.The biomass briquette with low cost,good mechanical performance and good applicability should be developed.The replacement of raw coal by briquette will be benefit to the environment.The developing of efficient,clean and low cost civil cooking stoves should be emphasized to improve the thermal efficiency of civil coal and achieve clean combustion.The civilian use of coal-fired flue gas purification system should be realized.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 296K]

  • Countermeasure of air pollutant controlled pollutation for civilian coal

    He Xuwen;School of Chemical and Environmental Engineering,China University of Mining and Technology (Beijing);

    Civilian coal occupies a large proportion of coal consumption in China,and the extensive and inefficient use of civilian coal leads to the discharge of a large number of gaseous pollutants,resulting in environmental pollution.Current situations of civil coal combustion and air pollutant discharge in China were introduced,through a literature survey and analyses of relevant data.According to the data investigation,the emission factors of main gas pollutants from civil coal combustion( particulate matter,SO_2,NO_x ,VOCs) are higher than those of the industrial pollution source.Therefore,the effective ways to reduce main atmospheric pollutant emissions of civil coal include the use of clean coal as an alternative and the application of efficient energy-saving stove.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 212K]

  • Treatment progress and standard modification suggestion for FGD wastewater from coal-fire power plants in China

    Ma Shuangchen;Wen Jiaqi;Wan Zhongcheng;Wu Kai;Chai Jin;Zhang Jingrui;Liu Qibin;College of Environmental Science and Engineering,North China Electric Power University;Sheng Environmental Technology Co.,Ltd.;

    At present,nearly 70 percent of domestic and foreign coal-fired power plants choose limestone-gypsum wet flue gas desulfurization as flue gas desulfurization( FGD) method,the desulfurization waste water produced by FGD has a complex composition and is difficult to dispose,so that makes it a current electric power environmental problem.Meanwhile,with the national environmental protection laws and regulations are becoming more stringent,waste water zero discharge technology will be complied into the technical specifications.As a huge water consumption unit,the effluent water quality and quantity of boiler system,water circulating system and environmental protection system in coal-fired power plants still need to be further studied.And considering the imperfection of existing waste water treatment technologies,it is recommended to revise the existing standard with the capability of waste water treatment by now. For example,drawing lessons from mature pollutants discharge standards of foreign developed countries,like transferring the focus from concentration control to total amount control.Treatment progresses for FGD waste water from coal-fired power plants,FGD waste water quality characteristics and source were summarized; and the domestic municipal sewage and industrial waste water discharge control standards and focal problems in the standard-setting process were concluded.In the very end,it is proposed that the total dissolved solids TDS( especially chloride ion),heavy metal ion pollution control level should be increased.Therefore,coal-fired power plants FGD waste water emission standard( 2006 edition)of power industry needs to keep its pace and respond positively to the national "Thirteen-Five"plans to promote and restrain the policy regulations in waste water zero-emission technology,and gradually improve the water environment in China.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 341K]

  • Review of regenerable sorbents for mercury removal from coal-fired flue gas

    Zhou Yuming;Yang Jianping;Zhao Yongchun;Zhang Junying;Zheng Chuguang;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology;

    Briefly reviewing the synergic mercury removal technology and regenerable sorbents for mercury removal from coal-fired flue gas especially those loaded with noble metals and metal oxides,the advantages and disadvantages were analyzed.A outlook of magnetic recyclable sorbents was given.A new idea that using magnetospheres from fly ash as recyclable sorbent was proposed to avoid the application limitations of the conventional mercury control technologies.The optimized method to produce Co_3O_4/CuCl_2 modified sorbent was investigated to improve the mercury removal efficiency and resistance of complicated flue gas with low HCl content. Finally,a feasible technological process for the application of magnetospheres was proposed. This process can achieve high efficiency mercury removal with low cost to avoid mercury pollution of environment.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 181K]

  • Numerical simulation of MILD combustion on coal-water slurry

    Duan Yansong;Zhang Liqi;Mao Zhihui;Zhu Xinyang;Hu Yi;Zheng Chuguang;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology;

    In order to solve the problems of poor operation stability of CWS( coal-water slurry) combustion,the MILD( moderate or intense low oxygen dilution) combustion characteristics of CWS were studied numerically based on the pilot-scale furnace of IFRF. Results show that under the same fuel input,the MILD combustion of CWS has extensive backflow region than the conventional swirl combustion,more intense flue gas circulation,lower and more uniform distribution of furnace temperature.The maximum peak temperature is reduced by 227 K.The rate of combustion reaction is slower,and the area of combustion reaction zone is larger.The whole furnace is in a low oxygen atmosphere,and the emission of NO_x is dramatically reduced by more than 50%.In addition,different concentrations CWS have little effect on flow distribution,but it can lower the temperature in the whole furnace and reduce the final NO_x emission.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 493K]

  • Interaction of blended-coal combustion process: Influence of excess air coefficient on burnout characteristics

    Ma Lun;Wang Tuwei;Fang Qingyan;Guo Anlong;Wang Tingxu;Tan Peng;Zhang Cheng;Chen Gang;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology;

    The experiment of the influence of excess air coefficient on the burnout characteristics are performed under four coals and their blended coals( 0%、25%、50%、75%、100%) The results show that the combustion of blended coal is impacted by two opposite effects: the promote function and the restrain function. Under the out-furnace coal blending method,the interaction of blended coal is obvious when low-volatile coal is blended with high-volatile coals( especially,under the blending ratio of 75%). Enhancing the excess air coefficient can weaken the restrain function. Under the in-furnace coal blending method,when low-volatile coal is blended with high-volatile coals,as increasing the excess air coefficient,the restrain function is also lower,and the combustion independence of individual coals gradually increases,and the burnout of blended coal approaches the linear value.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 349K]

  • Optimization of flow and ammonia injection by numerical simulation of SCR for a 660 MW coal-fired unit

    Li Zhuangyang;Su Lechun;Song Zijian;Tan Peng;Zhou Xu;Zhang Cheng;Sun Lushi;Chen Gang;Shajiao C Power Plant of Guangdong Yuedean Group Co.,Ltd;State Key Laboratory of Coal Combustion,School of Energy and Power Engineering,Huazhong University of Science and Technology;

    Selective catalytic reduction( SCR) is the most widely used denitration technology.A numerical study was carried out to evaluate the uniformity of gas flow and ammonia injection in the SCR denitration system of a 660 MW coal-fired unit.The influence of arrangement and structure of deflector on flow field in the system was investigated through comparing the uniformity of flue gas velocity and NH_3 concentration distribution in the top catalyst layer.The optimized ammonia injection mode was also studied based on the numerical simulation.Results show that the optimization of arrangement and structure of deflectors significantly improved the uniformity of flue field and NH_3 concentration distribution.The distribution of NH_3 concentration in the top catalyst layer was further optimized by the partitional ammonia injection mode,which produced through the simulation results.And the site tests verify that the outlet NO_x concentration of the SCR system was reduced by the control of the valve of ammonia injection grid.This paper aims to provide an optimized method of deflector and ammonia injection mode for the SCR system of power plant.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 382K]

  • Effect of steam on arsenic volatile characteristics during coal combustion

    Wang Hefei;Wang Chunbo;Zou Chan;Yue Shuang;Guo Hui;Department of Energy Power & Mechanical Engineering,North China Electric Power University;

    The combustion experiments of Qinghua coal were conducted on a customized isothemal thermogravimetric to study the effect of water on release characteristics of arsenic.Besides,XRD analysis was also used to make a further research on the mechanism of the effect of steam on release characteristics of arsenic.Results show that the presence of steam can accelerate the combustion rate of coal.At a certain temperature,the volatilization ratio of arsenic in steam atmosphere is larger than that without steam,and with the increase of steam concentration,the increase of arsenic volatilization ratio slow down.With the increase of temperature,volatilization ratio of arsenicincreased gradually,but the positive effect of steam on volatilization ratio of arsenic begins to weaken.Compared with air atmosphere,mineral compositionsin ash changed under the steam atmosphere,such as gypsum and other sulfate. It is mainly because the steam promoted the formation of gypsum and inhibited the formation of arsenate via avoiding the reaction between CaO and arsenic,resulting in the increase of arsenic volatilization ratio.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 214K]

  • Detection of SO3 in flue gas of coal-fired power plants with Controlled Cooling Method

    Wang Fengyang;Zhong Li;Lyu Haisheng;Han Lipeng;Jiang Jianzhong;Xiao Ping;Huaneng Clean Energy Research Institute;

    In order to evaluate the detection methods of SO_3 in flue gas of coal-fired power plants and the mitigation of SO_3,this research conducted the determination of SO_3 concentrations in a power plant with Controlled Cooling Method.It is found that:(1) the filtering equipment and the spiral centrifuge tube have significant influences on the sampling accuracy. The impacting and filtering dust collecting methods should be combined for sampling,and the cooling temperature should be adjusted in real time and accurately;(2) the concentrations of halogens in the solutions after sampling with Controlled Cooling Methods can reflect the sampling error in some degree,and the cooling temperature should be adjusted according to the concentrations of halogens;(3) the SO_2 can be strongly oxidized to SO_3 by SCR catalyst,and the concentration of SO_3 increases for 3 times through SCR.The removal efficiency of Air Preheater for SO_3 can reach 86%.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 146K]

  • Production and pilot-scale test of honeycomb DeNOx catalyst for low temperature flue gas from coking plant

    Li Changming;Xu Qicheng;Guo Feng;Tang Shibai;Yu Jian;State Key Laboratory of Multi-phase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences;

    The composition was optimized to obtain effective denitration catalyst for industrial application. The corresponding honeycomb catalyst was successfully produced in the continuous industrial production line by hydrothermal process of metatitanic acid,and the performance of the product was evaluated through 5 000 m~3/h pilot-scale test over flue gas from coking plant.The results demonstrate that the catalyst product have good low-temperature activity,strength,abrasion resistance as well as low cost.The catalyst exhibited excellent activity and stability with high SOxcontent( > 500×10~(-6)) at 300 ℃ or with low SOxcontent( < 200×10~(-6)) at 250 ℃ for two-week test in coking plant,respectively.NO_x emission concentration can be controlled below 250× 10~(-6)or 75× 10~(-6)with the ammonia escape less than 3×10~(-6)by modulation of ammonia nitrogen ratio.For the flue gas with high SOxcontent( > 500×10~(-6)) at 270 ℃,the catalyst is deactivated slowly during the one-week test,owing to the coverage of catalytic surface by ammonium sulphate species.The deactivated catalyst can be regenerated by high-temperature roasting.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 851K]

  • Separation behavior and Governance Research of halogen-bromine in coal combustion process

    Wang Wei;Qi Yun;Qi Qingjie;College of Safety Science and Engineering,Liaoning Technical University;Key Laboratory of Mine Thermodynamic disasters and Control of Ministry of Education (Liaoning Technical University);

    In order to solve emissions pollution problem of the trace halogen-bromine in coal combustion product,through fixed bed tube furnace coal combustion experiment,studied the impact on the precipitation of bromide while adding calcium matrix( CaO) as a solid bromide in the process of coal combustion.Results indicate that calcium substrate( CaO) can effectively reduce the amount of bromide,and it can absorb bromide to the maximum and reduce the emissions of bromide while the combination of pre-mixing and injection is used to add the strengthened bromide to the boiler in the process of coal combustion.In addition,the debromination efficiency of calcium bromide fixing agent is influenced by combustion temperature,retention time,quantity of calcium base solid bromide( CaO),and combustion atmosphere.The influence of such factors as the reasonable control of calcium in the process of coal matrix and the reaction conditions of bromide is helpful to improve the efficiency of calcium matrix debromination.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 238K]

  • Experimental study on improving the SO2 ultra low emission economy of 300 MWCFB boiler

    Jin Senwang;Liu Bin;Hui Yan;Gao Hongpei;Shi Zhenghai;Sun Xianbin;Xiao Ping;Yuan Ye;Tang Wei;Huaneng Clean Eneargy Research Institute Co.,Ltd.;

    In order to improve the economy of SO_2 ultra low emission of boiler unit,a real boiler test has been carried out in a 300 MWCFB boiler.The two stage combined desulfurization technology combined with dry desulfurization and CFB-FGD desulfurization in CFB boiler has been studied.The results show that the best desulfurizer varieties in dry process desulfurization and CFB-FGD can be optimized by theoretical analysis and laboratory test.The change of load in the operation parameters of CFB boiler affects two stage desulfurization efficiency at the same time.With the increase of the boiler load,the boiler bed temperatrue and inlet temperature desulfurization tower all show an upward trend.The increase of bed temperature reduces the desulfurization efficiency in the furnace,and the increase of the inlet temperature of desulfurization tower improves desulfurization efficiency of CFB-FGD.In accordance with the recommended limestone and lime physical and chemical parameters and two stage desulfurization system matching operation,the SO_2 concentration in boiler flue gas meets the requirements of ultra-low emission limits.The dry desulfurization and CFB-FGD desulfurizer consumption in the furnace both decrease,and the economic efficiency of SO_2 ultra low emission is improved,and the desulfurization cost is reduced.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 240K]

  • Catalytic oxidative desulfurization and denitration of organic sulfoxide catalysts

    Xiong Yingying;Yang Yang;Bai Tao;Department of Power Engineering,Shanxi University;

    In order to develop a simple,effective and low-cost control method for coal-fired flue gas,the integrated technology of catalytic oxidative desulfurization and denitration of organic sulfoxide is based on the modeling test system. Results indicate that while the flue gas temperature is about 150 ℃,sulfoxide organic catalyst can remove elemental mercury and sulfur dioxide efficiently,and can remove a large number of nitrogen oxide in flue gas.Controlling system pH by adding ammonium hydroxide,the efficiency of mercury removal can reach 95%.When the pH value is greater than 6.3,the removal rate of sulfur dioxide is above 99.5%,and when the pH value is less than 4,the removal rate of sulfur dioxide is less than 60%.The removal of NO_x depends on the form of NO and NO_2 relatively in flue gas.In actual operation,the flue gas inlet is connected to the powerful oxidant O_3 to oxidize NO to be N_2O_3 and NO_2,then followed by subsequent removal.The removal efficiency of nitrogen oxide in flue gas can guarantee to 80% or higher.Results indicate that the use of organic sulfone catalysts is a feasible option for the treatment of various pollutants in coal combustion under low temperature.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 190K]

  • Prevention and control of air pollution from the household coal combustion Part Ⅰ:A comparative experimental on combustion characteristics of household coal stoves of different designs

    Liang Bin;Song Hua;Bai Haolong;Wu Qiong;Bai Jiangzhi;Yang Xiaohui;Lan Tian;Yankuang Group Co.Ltd.;Yankuang Technology Co.Ltd.;

    In order to improve the combustion efficiency of the furnace on the market,and reduce the discharge of pollutants from civilian coal,and obtain different combustion patterns on the market of civil combustion characteristics,the combustion characteristics of chemical additives containing bituminous coal briquettes,developed by Yankuang Group Company,were experimentally investigated in newly developed staged pyrolysis-semi coke combustion stove and 6 other commercial household coal stoves. Water boiling speed,fire intensity,flue gas temperature,thermal power output,and CO emissions were measured and compared.The coal stoves were classified into 3 categories according to the air-flue gas flow mode,namely,updraft stove,downdraft stove and pyrolysis-semi coke combustion staged stove. Results demonstrate that the updraft stoves have higer water boiling speed and fire intensity,respectively at 8 ℃/min and over 2 kW.But this type of stoves emit heavy black smokes from the stack,causing serious air pollution.The thermal efficiency of the updraft stoves is low,and it is difficult to control the thermal power output,primarily due to the high flue gas temperature,which is average as high as 300 ℃,resulting in it is required frequent coal addition,and thus the furnace combustion and pollutant emissions have a strong cyclical. For the downdraft stoves,most of them cannot provide cooking functionality because of the multi-upward/downward flue gas flow path designs.The downdraft stoves can achieve smokeless combustion and emission,contributing to reduction in the PM_(2.5) and VOCs emissions.The downdraft stoves require less frequent coal addition,and the combustion process is relatively stable.However,due to the air flows downward through the entire coal packed in the stove,the coal pack is easily burnt through,leading to emerging serious smoke. The decoupling stoves are designed by separation of air starving pyrolysis process and air – rich semi-coke combustion process,which leads to appreciable NO_x reduction. The decoupling stoves can be characterized by higher fire speed and intensity( higher than 6 ℃/min and 2 kW respectively),excellent cooking ability,stable heat supply and higher thermal efficiency as results of complete coal briquette combustion and lower flue gas temperature( less than 250 ℃).Smokeless emission is achieved throughout the combustion process.The thermal power output is easy to adjust,and coal addition is much less frequent.Benefited by appropriate air staging supply,the complete coal combustion results in lower CO emission compared to other types of coal stoves.It can be concluded that by adapting the"coal-stove matching"principle,the combustion of bituminous coals can achieve smokeless,along with the features of high fire speed and intensity,ease to use and thus customer adoption.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 228K]

  • Feasibility analysis of denitration by ozone oxidation and its application in coal fired industrial boilers

    Yan Lili;China Coal Research Institute Company of Energy Conservation;State Key Laboratory of Coal Mining and Environment Protection;Energy State Key Laboratory of Coal Efficient Utilization and Energy-Saving Equiment;

    Coal will still be the main part of the energy consumption structure in China in a short term,but the pollutants produced by its combustion bring serious environmental pollution problems. The existing desulfurization and denitration process generally occupies a large area,and the investment and operation cost is higher,which is not suitable for the application of pulverized coal industrial boilers.According to the mechanism of ozone oxidation,proposed an efficient boiler flue gas pollutants removal methods,and through literature research,proved that denitrification results of this method,analyzed the main factors affecting the pollutant removal efficiency,expoundel the application of technology in foreign countries.Finally introduced the existing flue gas purification technology pulverized coal industrial boiler system,the ozone oxidation coupling of China Coal Research Institute independent high rate ash calcium circulating flue gas desulfurization( NGD) technology,effective removal of nitrogen oxides and completd the high order acid gases such as SO_2,SO_3,and,heavy metal hg,As,to achieve ultra the effect of low emissions,is of great significance for the formation of the integration of flue gas with the characteristics of pulverized coal industrial boiler purification technology.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 183K]

  • Research and application of desulfurization technology in bituminous coal pyrolysis

    Wang Zhizheng;Pei Xianfeng;Beijing Research Institute of Coal Chemistry,China Coal Research Institute;State Key Laboratory of Coal Mining and Clean Utilization;National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control;

    In order to improve the quality and efficiency of pyrolysis production,from the viewpoint of desulfurization,the application and research status of desulfurization technology in various sections were reviewed for sorting out the whole process desulfurization of pyrolysis.The whole process of desulfurization of pyrolysis includes three parts: coal desulfurization,pyrolysis desulfurization and gas desulfurization.Some coal desulfurization technologies,such as heavy medium washing and flotation have been commercialized application; while others such as electric separation,magnetic separation,microbial and chemical desulfurization methods are still under development; Pyrolysis desulfurization technologies,including those in different atmospheres and those with different additives,are in the research stage; in contrast,wet oxidation methods are the most widely used gas desulfurization technology.In order to achieve the effective desulfurization of the whole process,the following aspects should be further strengthened,(1) increasing the application scope and research of pre-coking desulfurization technology;(2) strengthening the research and development of organic sulfur removal technology;(3) researching and developing the environment friendly technologies to reduce process pollution.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 116K]

  • Progress and situation analysis of coal fired industrial boilers in China

    Liu Jianhang;Coal Research Institute Energy Conservation Technology Co.,Ltd;State Key Laboratory of Coal Mining and Clean Utilization;National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control;

    In China,coal fired industrial boilers are dominated in industry.In order to provide the reference option for user choosing appropriate boilers in the project,the technical features and application status of three different types of coal fired industrial boilers were discussed.Circulating fluidized bed boiler and pulverized coal fired industrial boiler were analyzed in terms of combustion method and technical characteristics.It was thought that fluidized combustion is the basis of circulating fluidized bed boiler technology,and dense phase chamber combustion is the foundation of modern pulverized coal boiler.Relying on the huge heat capacity of dense bed,circulating fluidized bed boiler is suited for processing high ash fuel; and likely,dependent on low rank,high activity,and clean pulverized coal jet combustion ignition and fast response,pulverized coal fired industrial boiler is fit for oil( gas) boiler's backup and swapping.Therefore,circulating fluidized bed boilers and pulverized coal industrial boilers have their own scope of application,the two technologies are not trade-offs but complementary relationship.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 460K]

  • Investigation of the CO2 adsorption performance of ionic liquid polymer

    Guo Chenchen;Beijing Research Institute of Coal Chemistry,Coal Science and Technology Co.,Ltd.;State Key Laboratory of Coal Mining and Clean Utilization;Beijing Key Laboratory of Coal Based Carbon Materials;

    To improve the CO_2 adsorptive capacities of ionic liquid,the quaternary ammonium salt ionic liquid polymers were synthesized by free radical polymerization.Additionally,the porous ionic liquid polymers were achieved by two-staged seeded swelling polymerzation.The characteristics of the polymers were tested by SEM and DSC-TG.Adsorption isotherms of CO_2 on the polymers,which were synthesized by four different kinds of swelling agents,were investigated.The main findings are summarized as follows: the porous ionic liquid polymers have highly developed micro pore structure,and the pore widths have continuous distribution in the range of 0.4 ~ 0.8 nm.The pore widths mainly distribute in the range of 0.5 ~ 0.6 nm,which is up to 38%.The swelling agents had effect on pore size distribution and the cumulative pore volume,which is attributed to the difference of the solubility between the swelling agents and polymers.The pore size distribution of polymers is more uniform when using the mixed swelling agents.The cumulative pore volume decreases obviously when using the cyclic ethane swelling agents.The CO_2 adsorptive capacity is mainly affected by the cumulative pore volume.The polymers with equivalent cumulative pore volume have the similar CO_2 adsorptive capacity,which is about 1.1% at 273 K and 0.101 MPa.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 314K]

  • Effect of gravitational deposition on particle tube loss of sampling system

    Zhu Runru;Energy Conservation and Engineering Technology Research Institute,CCTEG Coal Research Institute;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;

    The effect of gravitational deposition on the transporting loss usually caused a system error in sampling tube according to the gravitational deposition theory.Thus,the measurement error of in-situ horizontal straight sampling tube was theoretically studied in this paper.Results show that with the particle diameter and the residence time increase,the transporting loss increases significantly. The online monitor standard of the ultra-low emission of particle should be less than 10 mg/m~3 when considering the transporting loss of the horizontal sampling tube in the in-situ external particle extraction sampling system. In addition,the extra particulate matter emission of a 600 MW coal-fired power plant is about 15. 5 t per year due to the effect of the transporting loss on the horizontal straight sampling tube measurement.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 141K]

  • Research on furnace explosion protection strategy of efficient pulverized coal fired boiler based on SVM

    Pan Hao;China Coal Research Institute Company of Energy Conservation Co.,Ltd.;State Key Laboratory of Coal Mining and Environmental Protection;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;

    In order to improve the combustion stability of pulverized coal fired boiler,a furnace explosion protection strategy based on Support Vector Machine( SVM) was proposed in the paper. The state vector was constructed with key parameters of the boiler; afterwards a system state classifier was generated by training off-line history data of boiler with SVM,applying radial basis function and grid search algorithm.Besides,the oxygen content factor was introduced to regulate the training model.During running time of boiler,the classifier predicted pre-furnace state from on-line data then executed protection program through PLC( Programmable Logic Controller) module. Results show that when the oxygen content factor takes value of 0.4,the maximum cross validation matching rate of the classifier is over 97%,the maximum predicting accuracy is over 95%,and mismatching rate is less than 10%.The protection strategy is able to identify the pre-furnace explosion state of boiler effectively as well as keeping low error judging rate under normal working state,and enhance the robustness of the system

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 157K]

  • Strategy and its application for the overall energy system optimization of coal to olefin plant

    Li Chufu;Yao Jinsong;Ba Liming;Gao Lijuan;Huang Feng;Zhang Zhaohuan;Zhang Feng;Jiang Xingjian;National Institute of Clean-and-Low-Carbon Energy,Shenhua Group Co.,Ltd.;Baotou Coal Chemical Branch,China Shenhua Coal Chemical Co.,Ltd.;

    To optimize the overall energy system of coal to olefins plant,a progressive and collaborative strategy based on the unit,subsystem and global division is proposed for overall energy system optimization of coal to olefins plant.The whole plant energy consumption analysis,process equipment energy efficiency improvement,heat-exchanger network optimization,low grade heat recovery and utilization optimization and the whole plant steam and power system optimization were systematically studied.Based on the strategy,an overall energy system of a coal to olefins plant with 600 thousand tons olefin output per year was optimized.Energy consumption proportion for all processes was obtained,and some optimization schemes for saving energy were proposed. Accordingly,heat exchanger network of methanol synthesis and MTO units and steam decompression in the steam power system and rational utilization of low grade heat were thus optimized.Theoretically,it can improve the overall energy efficiency of more than 3%,save over 100 thousand ton standard coal,and achieve the investment recovery period of less than 1 year.The optimization strategy can provide reference for energy saving and emission reduction in the coal to olefin industry.

    2017 04 v.23;No.110 [Abstract][OnlineView][HTML全文][Download 180K]
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