循环流化床大气污染物机理模型及关键状态变量研究  

Study on Mechanism Model and Key State Variables of Air Pollutants in Circulating Fluidized Bed

作　　者：蒋海威 高明明[1] 张开萍 张一帆 岳光溪[2] JIANG Haiwei;GAO Mingming;ZHANG Kaiping;ZHANG Yifan;YUE Guangxi(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijng 102206,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206 [2]清华大学能源与动力工程系,北京100084

出　　处：《动力工程学报》2024年第4期622-631,共10页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发计划资助项目(2022YFB4100304);国家自然科学基金资助项目(62276096);华能集团总部科技项目基础能源科技研究专项资助项目(HNKJ21-H31)。

摘　　要：基于循环流化床机组炉内脱硫、炉内自脱硝和选择性非催化还原(SNCR)脱硝技术等,对循环流化床锅炉(CFB)机组大气污染物排放进行了研究,建立了CFB机组炉内燃烧模型以及污染物生成、脱除模型,并对影响污染物排放的关键状态变量进行了分析。结果表明:所建立的循环流化床机组SO_(2)和NO_(x)排放模型可以较好地拟合实际运行数据,且具有一定的预测效果和较强的模型通用性;即燃碳的燃烧影响了炉内还原气氛,其会显著影响炉内NO_(x)的还原;活性石灰石量以及炉膛温度是影响SO_(2)与活性石灰石固化反应的主要因素,相对较高的炉膛温度以及较少的活性石灰石存量均会使SO_(2)排放质量浓度升高,但温度越高,NO_(x)的排放水平越低。Based on the technology of desulfurization,self-denitrification and selective non-catalytic reduction(SNCR)denitrification in circulating fluidized bed(CFB),the emission of air pollutants from CFB units was studied.The combustion model,the pollutant generation and removal model in CFB units were established,and the key state variables affecting the emission of pollutants were analyzed.Results show that the established models of SO_(2)and NO_(x)emission of CFB units can fit the actual operation data well,and have certain prediction effect and strong model universality.The combustion of carbon affects the reduction atmosphere in the furnace,which significantly affects the reduction of NO_(x).The amount of active limestone and furnace temperature is the main factors affecting the curing reaction between SO_(2)and active limestone,while relatively high furnace temperature and less active limestone stock will both increase the concentration of SO_(2)emission,but the higher the temperature is,the lower the level of NO_(x)emission is.

关 键 词：循环流化床 氮氧化物 二氧化硫 即燃碳 活性石灰石 

分 类 号：TQ534[化学工程—煤化学工程]