燃煤电厂烟气污染控制系统的[火用]分析  

Exergy Analysis of Flue Gas Pollutant Control System in Coal-fired Power Plants

作　　者：于荆鑫 王菁[1] 杨凤玲[1] 郝艳红[1] 程芳琴[1] YU Jing-xin;WANG Jing;YANG Feng-ling

机构地区：[1]山西大学山西低附加值煤基资源高值利用协同创新中心,国家环境保护煤炭废弃物资源化高效利用技术重点实验室

出　　处：《电站系统工程》2019年第2期1-5,共5页Power System Engineering

基　　金：山西省重点研发计划重点项目(201703D111018);NSFC-国家基金重点项目(U1610254);山西省自然科学基金(201701D121124)资助

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.

关 键 词：燃煤电厂 烟气污染控制系统 变负荷 [火用]损失 [火用]效率 

分 类 号：X773[环境科学与工程—环境工程]