适应深度调峰的循环流化床NO_(x)排放建模  

Modeling of nitrogen oxide emission in circulating fluidized bed for deep peak regulation

作　　者：高明明 郭炯楠 于浩洋 王亚柯 岳光溪[3] GAO Mingming;GUO Jiongnan;YU Haoyang;WANG Yake;YUE Guangxi(School of Control and Computer Engineering,North China Electric Power University,Beijing 102206,China;Huaneng Renewables Co.,Ltd.,Beijing 100036,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206 [2]华能新能源股份有限公司,北京100036 [3]清华大学能源与动力工程系,北京100084

出　　处：《洁净煤技术》2023年第6期24-31,共8页Clean Coal Technology

基　　金：国家重点研发计划资助项目(2022YFB4100304)。

摘　　要：为响应“十九大”绿色环保精神,满足循环流化床机组超低排放需求,建立准确的NO_(x)排放浓度机理控制模型对于设计循环流化床机组脱硝自动控制方法具有重大意义。从循环流化床锅炉燃烧机理切入,建立即燃碳模型,并将燃料氮分为挥发分氮与即燃碳氮2部分构建NO_(x)炉内自生成模型;考虑CO和即燃碳对NO_(x)的还原作用推导NO_(x)自还原模型;构建选择性非催化还原脱硝模型,综合以上模型建立了适应深度调峰的循环流化床NO_(x)排放模型。探究了机组深度调峰下运行参数与NO_(x)排放浓度的关系以及与选择性非催化还原脱硝效率的影响因素。仿真验证试验表明建立的循环流化床NO_(x)模型取得了较好仿真效果,稳态工况的模型计算值平均预测时间为114 s,与实测值的平均相对误差为2.50%;深度调峰下的模型计算值平均预测时间为126 s,与实测值的平均相对误差为5.42%。模型计算量较实测量提前2~3 min,具有一定预测效果。NO_(x)排放浓度模型可为今后循环流化床机组适应深度调峰、快速变负荷以及超低排放研究提供参考。In order to respond to the green environmental protection spirit of the 19th National Congress of the Communist Party of China and meet the ultra-low emission requirements of circulating fluidized bed units,it is of great significance to establish an accurate NO_(x) emission concentration mechanism control model for the design of denitrification automatic control method of circulating fluidized bed units.Based on the combustion mechanism of circulating fluidized bed boiler,the model of immediate combustion carbon was established,and the fuel nitrogen was divided into volatile nitrogen and immediate combustion carbon nitrogen to construct the self-generation model of NO_(x) in the furnace.The NO_(x) self-reduction model was derived by considering the reduction effect of CO and immediate combustion carbon on NO_(x).A selective non-catalytic reduction denitrification model was constructed,and a circulating fluidized bed nitrogen oxide emission model suitable for deep peak shaving was established based on the above models.The relationship between operating parameters and NO_(x) emission concentration under deep peak regulation and the influencing factors of selective non-catalytic reduction denitrification efficiency were explored.The simulation verification test shows that the established circulating fluidized bed NO_(x) model has achieved good simulation results.The average prediction time of the model calculation value under steady-state conditions is 114 s,and the average relative error with the measured value is 2.50%.The average prediction time of the model under deep peak shaving is 126 s,and the average relative error between the calculated value and the measured value is 5.42%.The calculation of the model is 2-3 minutes earlier than the actual measurement,which has a certain prediction effect.The designed NO_(x) emission concentration model in this paper can provide a reference for the future research of circulating fluidized bed units to adapt to deep peak regulation,rapid load change and ultra-low emission

关 键 词：循环流化床 NOX排放 深度调峰 机理模型 超低排放 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程] X511[环境科学与工程—环境工程]