摘要
为对火电脱硝技术进行科学评价,引入相离度理论改进了区间型指标的隶属函数,运用博弈论赋权法对指标体系进行集成赋权,建立了优化的脱硝技术评价模型。将该模型应用于国内完成炉内低氮改造的660 MW火电煤粉炉与流化床炉,综合评价选择性催化还原(SCR)、选择性非催化还原(SNCR)、SNCR-SCR联合3种脱硝技术。结果表明,在完成炉内低氮改造的条件下,额定负荷稳定运行的660 MW火电煤粉炉脱硝宜优先选用SCR技术,流化床炉应优先选用SNCR技术,为实现氮氧化物超低排放,必要时可选用SNCR-SCR联用技术,评价结果与《火电厂污染防治可行技术指南》的相关内容一致,验证了评价模型的合理性,额定负荷50%、75%工况下的评价结果表明,额定负荷50%工况下660 MW火电煤粉炉脱硝宜优先选用SNCR-SCR技术,其余低负荷工况的评价结果与额定工况一致,为火电脱硝技术的评价与选择提供了方法参考和理论依据。
In order to get scientific evaluation result of coal-fired power denitrification technologies,deviation degree theory was applied to construct subordinate function of interval index,besides,the game theory weighting method was used in index weight calculation and optimizing evaluation model of denitrification technologies.The model was applied to the pulverized coal fired boiler and fluidized bed boiler with low NO x burner of 660 MW coal-fired plant in China.Three kinds of denitration technology,i.e.,selective catalyst reduction(SCR),selective non-catalyst reduction (SNCR) and hybrid SNCR-SCR,were comprehensively evaluated.Results show that SCR technology should be preferred for denitration of 660 MW thermal power pulverized coal furnace with stable rated load under the condition of low nitrogen reformation in the furnace,SNCR should be preferentially selected for the fluidized bed boiler,SNCR-SCR technology can be used to realize ultra low emission.More importantly,the evaluation results are consistent with the feasible technical guide for prevention and control of pollution in thermal power plants,which verifies the rationality of the evaluation model.The evaluation results under 75% and 50% load show that SNCR-SCR technology should be preferentially selected for the pulverized coal fired boiler under 50% load.The evaluation results of the remaining low-load working conditions are consistent with the rated load working conditions,which provides a reference and theoretical basis for the evaluation and technical selection of denitrification technologies.
作者
许霁
王贲
于洁
孙路石
杨武
XU Ji;WANG Ben;YU Jie;SUN Lushi;YANG Wu(State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan430074,China)
出处
《洁净煤技术》
CAS
2019年第2期126-133,共8页
Clean Coal Technology
基金
国家重点研发计划资助项目(2018YFB0604202)
中央高校基本科研业务费专项资金资助项目(2017JYCXJJ035)
关键词
相离度
博弈论赋权法
脱硝
技术评价
隶属函数
deviation degree
game theory weighting method
denitration
technology evaluation
membership function
