Optimization of real-time coal blending system based on non-silos

Combined with the status of coal blending and management in fire-power plant,the shortcomings and unfitable elements in fuel management were analyzed.A design of intelligent fuel management and real-time coal blending system based on non-silos in power plant was proposed.The results showed that the pretreatment ditch and precise location based on calorific value and sulfur were set.With online monitoring and control system,the coal blending could be adjusted evenly,the particle size was less than 10 mm,the sulfur and calorific value of coal boiler could meet the design requirements,and it ensured the effective control of pollutants and the stable combustion of the boiler.A real-time fuel management solution and multi-channel separating and conveying device and control system of closed type coal blending based on non-silos was proposed.The solution could maximally reduce production cost and coal consumption,improve fund utilization rate and realize intelligent management of fuel.

Study on isothermal drying process and kinetics of lignite

For the research of lignite drying process,using the water quality analyzer and differential thermogravimetric analysis method,isothermal drying experiments were carried out on lignite with different grain sizes at different drying temperatures. The curves of moisture content and drying time and the curve of drying rate and water content were obtained.The moisture content conversion of lignite with different particle sizes was made by the size distribution coefficient,and the experimental data were fitted with different drying models.The drying equation and the kinetic parameters of the three drying stages were obtained at the medium temperature of 140 ℃.The results showed that the drying rate characteristics constant k,which was obtained by introducing the particle size distribution coefficient,was similar to that of the drying rate characteristic constant k with different particle sizes.According to the drying rate and moisture content of lignite,the drying process was divided into three stages.The drying equation model was obtained by using linear drying model,Wang empirical model and Page model respectively.According to the empirical formula of Arrhenius,the relationship between ln k and 1/T was established,and the activation energy of Eawas 17.088 k J/mol and the pre exponential factor A was 12.47 min~(-1).

Characteristics and cleanliness class of Binchang mining area No.4 coal seam

In order to use Binchang coal efficiently and cleanly,the coal rock and coal quality characteristics of the main mineable coal seam No.4 coal seam were systematically analyzed based on the past Binchang mining area exploration drilling coal quality testing statistics analysis.The distribution of sulfur,ash content,volatile matter,calorific value and harmful trace elements of No.4 coal seam were discussed.According to the new coal resource potential evaluation of the proposed clean coal classification scheme grade 6,the cleanliness of Binchang mining area No. 4 coal seam was drew primarily from the aspects of ash,sulfur,F,Cl,As and Pb. The low sulfur,low-medium ash,medium-high volatile,extra-high calorific value non-caking coals were the main coal types of No.4 coal seam,the weakly caking coal was a few.The cleanliness class of raw coal was Ⅲ which belonged to the better clean coal.The cleanliness class of float coal wasⅡwhich was good clean coal.The clean coal rank of No.4 coal seam in the whole mining area was mainly grade Ⅲ clean coal,the distribution area occupied 73.03% of the mining area,only a small range of Ⅳ grade in the area of Hongjia Town-Jujia Town and the Middle East clean coal distribution area,accounting for an area of 26.97%.

Technical and economic analysis of underground coal gasification combined synthetic liquefied natural gas

In order to analyze the economic feasibility of the technology of underground coal gasification combined synthetic liquefied natural gas( UCG-LNG),based on the experimental data,taking the UCG-LNG project with an annual output of 200 million cubic meters LNG as example,the project's total investment,items and percentage of each item in the engineering cost and LNG production cost were calculated,and the project's sensitivity was analyzed.The results showed that the total investment was about RMB 1.87 billion,of which 88.3% was engineering fee,while in the engineering fee,the total investment of air separation equipment,coal gas purification equipment and equipment of liquefied natural gas was up to 69.5%.In the condition of the LNG sale price was 3.21 $/m3,the project's pre-tax internal rate of return( IRR) was 10.90%,the investment recovery period was 9.85 years( including 3 years of construction period),it was economically feasible.Sensitivity analysis showed that the LNG's sales price had the most evident influence on the project's IRR.

Effects of moisture on pyrolysis products distribution of Shendong coal

To investigate the effects of moisture of feed coal on the pyrolysis products distribution of Shendong coal,Gray-King and kilogram-scale pyrolysis with solid heat carrier experiments were conducted to investigate the products distribution under different moisture.The results of Gray-King experiments showed that moisture had significant influence on the ratio of coal tar and pyrolysis gas.The tar yield percent decreased from 9.98% to 4.92% as moisture decreased,while pyrolysis gas yield increased from 8.47% to 11.07% and pyrolysis water yield increased from 2.74% to 5.94%.The results of kilogram-scale experimental equipment illustrated the similar tendency as the Gray-King experiments.As moisture decreased,the yield of tar decreased while the yield of pyrolysis gas increased.The pyrolysis tar yield of coal without drying treatment was 2.17% higher than that of coal with drying treatment,while the pyrolysis gas yield was 1.58% lower.The analysis results showed that the pyrolysis temperature had influence on the content of H2 and CO.The increasing moisture had benefit for the reduce of pyrolysis water and gas while yielding more tar.Therefore,the distribution of pyrolysis products could be adjusted by controlling the moisture of feed coal.

Experimental research on Shenhua coal blending combustion in a 1000MW tower type boiler unit

In order to study adaptability of Shenhua coal blending combustion in tower type boiler,the blending ratio of Shenhua coal was gradually raised by inner blended combustion and outer blended combustion.The security,economy and environmental protection of the tower type boiler were evaluated.The results showed that,with the increase of the blending ratio of Shenhua coal,the carbon content of ash decreased,the boiler efficiency increased.When the outer blending ratio of shenhua coal was less than 75% and the inner blended ratio less than 60%,the water and steam parameters is normal,no boiler slagging phenomenon,the boiler had good adaptability to the coal.When the outer blending ratio was higher than 75% and the inner blended ratio reached 60%,the local slagging appeared on the furnace waterwall,the boiler efficiency was higher than the outer blended combustion under the same coal proportion.Once the Shenhua coal was combusted for a long time,more attention should be payed to the primary superheater area and the burner area to prevent slagging.

Research on steam power system in larger scale coal to olefin plant

In order to solve the problems of steam power system in coal to olefins( CTO) project,like low steam parameters,high coal consumption and standby capacity,network imbalance,the characteristics of steam power system were analyzed. By introducing supercritical coal power units and a manifold steam pipe system,a new design concept in large-scale CTO project was presented. In a 1. 2 Mt/a CTO steam power system,a combination of two 350 MW supercritical coal power units with 8-9 regenerative and 1 reheat system,reduced coal consumption rate from 450 g/k Wh to 320 g/k Wh.A manifold steam pipe system helped to achieve flexible switching between units,to meet a 8 000 h/a high reliability standard with zero standby.System power output met the requirements of CTO project,and it could serve 255 MW to power grid.The system had good expansibility to meet different scale of the CTO project in the future.

Dissovled organic matters characteristics in coal gasification waste water

The dissolved organic matters( DOM) in coal gasification waste water determined the treatment agent and microbial growth,meanwhile,the effects of waste water treatment project were directly influenced by them.The spectral characterization of DOM reflected the oxidation,degradation and absorption characteristics of all kinds of the components.Some waste water after removing phenol ammonia from one urea production enterprise which adopted coal gasification technology was analyzed. The Ho A,Ho B,Ho N,Hi A,Hi B,Hi N in the waste water were separated with resin separation method.The waste water characteristics were tested by ultraviolet-visible spectrum and three dimensional fluorescence spectrum.The experimental results showed that the proportion of Ho A and Ho N components in DOM were up to43. 21% and 33. 65% respectively which meant there were many aromatic compounds with unsaturated structure in the waste water. The E300/E400 of 6 components in dephenolized waste water ranged from 2. 88 to 5. 00,the low value of E300/E400 showed the high humification degree of waste water and the main refractory organics with benzene ring structure.According to three dimensional fluorescence spectrum,the strongest fluorescence response region of 6 components in DOM mainly included 4 kinds of organics such as humic-like acid,fulviclike acid,tyrosine-like acid and tryptophan-like acid.All these analysis provided theoretical basis for controlling and treating the organic pollutants of the coal gasification waste water.

Experimental study on concentration treatment process of desulfurization waste water in coal-fired power plant

In order to reduce the processing cost of zero-discharge of desulfurization waste water from coal-fired power plant,through the experiment in this paper,the technical feasibility of process in concentrating desulfurization waste water throuth pretreatment of softening and tubular ultrafiltration and DTRO and evaporation and crystallizationby experiment were studied,the key operation of each process parameter were explored.The experimental results showed that the pretreatment of lime,p H varying from 10.5 to 11,magnesium ion removal effect was good,and it could remove most of heavy metals and fluoride,The anti fouling performance of tubular ultrafiltration and DTRO was better,and the waste water could be reduced and the recovery rate was controlled between 65% and 70%,and the system could be operated stably,concentrated water could be entered the evaporation and crystallization,the evaporation of water was reduced by 50%-60%,and the investment and operation cost were reduced to a certain extent.

Permeability characteristics and key controlling factors of low rank coal in Northeastern Erdos Basin

In order to discuss the impact of permeability of low-rank coal reservoirs on coalbed methane exploration area and productivity construction,the relationships between permeability and crustal stress,burial depth,micropetrological unit,coal rank,cleat spacing and coal structure were applied to analyze the control of permeability on the basis of coalbed methane reservoirs permeability characteristics in the northeastern margin of Ordos Basin.The results showed that the permeability in the area,higher than medium-high rank coal reservoirs permeability,was mainly controlled by coal rank,cleat spacing and crustal stress. Coal rank and cleat spacing affected permeability by changing coal mechanical property during coalification.Crustal stress influenced permeability by controlling the spacing and direction of cleat.Other parameters,such as burial depth,micropetrological unit,had insignificant influence on permeability in the area.

Evaluation of key industries associated with coal energy saving technologies based on industrial correlativeness degree analysis

In order to investigate some key energy saving technologies which were associated with coal industry,the key industries were determined through factor analysis and clustering analysis.The breadth and depth of industry contact were calculated.The using methods and advantages of the industries were analyzed.The SWOT method was adopted to analyze the lifetime of the energy saving technologies.The energy saving technologies associated with coal were that the products of the industries consumed coal directly or indirectly,coal industry consumed the products of the industries or the coal could be replaced by the products of the industries. The advantages of the energy saving technologies were that saving cost and energy,using sample technologies.The industries associated with coal contained four energy saving directions which were coal natural gas co-gasification to produce synthesis gas and coal gasification technology,secondary energy techologies,high efficient plastic and coal injection technologies,mixed coal combustion technologies.

Experimental test method for alkalinity of boiler water in industrial pulverized coal boiler

In order to use small amounts of indicators to measure alkalinity of boiler water in industrial pulverized coal boiler accurately,the effects of indicator dosage and boiler water sampling volume on boiler water alkalinity measurement results were studied.First,100 m L boiler water was sampled,the influence of phenolphthalein and methyl orange dosage on phenolphthalein alkalinity and total alkalinity measurement results were researched.Then,100 m L,50 m L and 25 m L boiler water were sampled respectively,and the effects of boiler water sampling volume and indicator dosage on boiler water alkalinity measurement results were compared.The results showed that,different dosage of phenolphthalein and methyl orange affected the color of the solutions,while it had no effect on alkalinity measurement results. The measurement results were basically the same when the sampling volume were 50 m L and 100 m L.However,there was higher error while the sampling volume were 25 m L.So 50 m L sampling volume,1 drop phenolphthalein indicator and 1 drop methyl orange indicator could obtain accurate results.

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