燃煤电厂烟气污染控制系统的?分析
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摘要
为了获得燃煤电厂烟气污染控制系统运行过程中的物质消耗与能源利用的相关信息,利用Aspen Plus模拟软件对燃煤电厂烟气污染控制系统进行仿真模拟。在验证模型正确性的基础上,通过改变负荷条件,模拟电厂烟气污染控制系统在不同负荷下的运行特性,得到详细的热力学参数,并基于该模拟结果对系统开展?分析。结果表明,不同负荷下,除尘单元?损失变化不大,但负荷变化对GGH、SCR脱硝单元与FGD单元?损失变化影响较大,影响程度由大到小为FGD>SCR>GGH;同一负荷下,烟气污染控制系统各单元的?效率由高到低的排序为:WESP>ESP>GGH>SCR>FGD,除尘单元的?效率高达99%以上,而FGD单元?效率在89%～93%,是整个烟气污染控制系统中?效率最低的单元,是提高系统整体?效率的关键对象。
In order to study the relationship between material consumption and energy utilization during the operation of flue gas pollution control system of coal-fired power plants, it simulated the pollutants control process by the Aspen Plus software and the correctness of the model was verified by compare with the operation data of the 600 MW power plant.By changing the load conditions, the operating characteristics of the pollution control system under different working conditions were simulated, and the detailed thermodynamic parameters were obtained. Based on the simulation results,the exergy of the system was analyzed and calculated. The results showed that under different loads, the exergy loss of the dust removal system did not change much, while, that of the GGH、SCR denitration system and the FGD system changed distinctly, the degree of influence is(from large to small) FGD>SCR>GGH. Under the same load, the order of the exergy efficiency(from high to low)of each flue gas pollution control unit was: WESP>ESP >GGH>SCR>FGD. The dust removal efficiency of the dust removal system was over 99%, while the efficiency of the FGD system was mainly concentrated in 89%-93%. It was the lowest efficiency among the whole control system, and could be considered the key units to improve the exergy efficiency of the whole system.
In order to study the relationship between material consumption and energy utilization during the operation of flue gas pollution control system of coal-fired power plants, it simulated the pollutants control process by the Aspen Plus software and the correctness of the model was verified by compare with the operation data of the 600 MW power plant.By changing the load conditions, the operating characteristics of the pollution control system under different working conditions were simulated, and the detailed thermodynamic parameters were obtained. Based on the simulation results,the exergy of the system was analyzed and calculated. The results showed that under different loads, the exergy loss of the dust removal system did not change much, while, that of the GGH、SCR denitration system and the FGD system changed distinctly, the degree of influence is(from large to small) FGD>SCR>GGH. Under the same load, the order of the exergy efficiency(from high to low)of each flue gas pollution control unit was: WESP>ESP >GGH>SCR>FGD. The dust removal efficiency of the dust removal system was over 99%, while the efficiency of the FGD system was mainly concentrated in 89%-93%. It was the lowest efficiency among the whole control system, and could be considered the key units to improve the exergy efficiency of the whole system.
引文
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[3]李慧君,刘志申,张魁龙,等.纯热量法在火电厂热力系统局部定量分析中的应用[J].热力发电,2002,31(5):9~12.
[4]朱明善.能量系统的?分析[M].清华大学出版社,1988.
[5]XIONG J,ZHAO H,ZHENG C.Exergy Analysis of a 600 MWe Oxy-combustion Pulverized-Coal-Fired Power Plant[J].International Journal of Greenhouse Gas Control,2012,9(8):469~483.
[6]闫丽涛.300 MW火力发电机组热力系统(?)分析及优化研究[D].华北电力大学(保定),2009.
[7]甄静.超临界汽轮机热力系统?分析[D].陕西科技大学,2015.
[8]张丹,曾涛,徐明厚.燃烧后CO2捕集燃煤发电系统(?)分析[J].燃烧科学与技术,2013,19(3):220~226.
[9]刘福国,蒋学霞,李志.燃煤发电机组负荷率影响供电煤耗的研究[J].电站系统工程,2008,24(4):47~49.
[10]王临清,朱法华,赵秀勇.燃煤电厂超低排放的减排潜力及其PM2.5环境效益[J].中国电力,2014,47(11):150~154.
[11]HAN X,LIU M,WU K,et al.Exergy analysis of the flue gas pre-dried lignite-fired power system based on the boiler with open pulverizing system[J].Energy,2016,106:285~300.
[12]Hao Y,Huang Y,Gong M,et al.A polygeneration from a dual-gas partial catalytic oxidation coupling with an oxygen-permeable membrane reactor[J].Energy Conversion&Management,2015,106:466~478.
[13]张丹.基于热力学第二定律的减排CO2的燃煤发电系统技术经济分析及优化[D].华中科技大学,2013.
[14]韩旭,朱敬,李雄浩,等.具有负荷调节和烟气均流功能的脱硫喷淋塔.CN101298020[P].2008.
[15]孙克勤,钟秦.火电厂烟气脱硫系统设计、建造及运行[M].化学工业出版社,2005.