480 t/h供热锅炉脱硝还原剂改造稀释风热源选择及控制技术探讨  

Discussion on Heat Source Selection and Control Technology of Dilution Air in Denitration Reducing Agent Renovation of 480 t/h Heat Supply Boiler

作　　者：徐灏 XU Hao(Zhejiang Tiandi Environmental Protection Technology Co.,Ltd.)

机构地区：[1]浙江天地环保科技股份有限公司

出　　处：《上海节能》2022年第7期892-896,共5页Shanghai Energy Saving

基　　金：浙江省能源集团有限公司科学技术项目(ZNKJ-2021-066)。

摘　　要：基于480 t/h供热锅炉采用尿素热解替代液氨工艺的改造设计,对其热源选择和稀释风控制技术进行探讨。对于采用气-气换热器进行稀释风加热的尿素热解系统,稀释风量的选取应以在锅炉低负荷运行工况时,满足尿素热解所需热量平衡的最小风量来计算。通过调节气-气换热器入口稀释风流量,对尿素热解器出口温度进行综合控制,可以满足锅炉不同运行负荷范围内脱硝性能的要求。Aiming at the reconstruction design of 480 t/h heating boiler using urea pyrolysis instead of liquid ammonia process,the selection of heat source and the technical characteristics of dilution air control are discussed.For the urea pyrolysis system heated by dilution air with gas-gas heat exchang-er,the selection of dilution air volume should be based on the minimum air volume to meet the heat balance required for urea pyrolysis under low load operation condition of boiler.By adjusting the dilu-tion air flow at the inlet of the gas-gas heat exchanger,the outlet temperature of the urea pyrolyzer can be comprehensively controlled,which can meet the requirements of denitration performance within different operation load range of the boiler.

关 键 词：供热锅炉 脱硝 尿素热解 稀释风热源 气-气换热器 控制 

分 类 号：X773[环境科学与工程—环境工程]