中小型燃气锅炉烟气尿素喷射混合模拟研究  

作　　者：赵佳慧[1] 禚玉群[1] 李仲博[2] 王海鸿[2] 周宇涵[2] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室 [2]北京市热力集团有限责任公司

出　　处：《区域供热》2017年第4期129-134,共6页District Heating

基　　金：课题编号:Z141100002714012;课题名称:燃气锅炉NOX达标排放关键技术研究与示范

摘　　要：为了改善京津冀地区日益严重的雾霾状况,针对中小型锅炉,北京市在开展"煤改气"工作的同时,对燃气锅炉的氮氧化物排放进行了更严格控制。选择性催化还原脱硝技术成为燃气烟气脱硝的技术选择。实现还原剂与烟气均匀混合是这两项技术的关键。本文针对泰山集团40t/h的SZS29-1.6/130/70-Q锅炉,以已有热力计算的数据为基础,利用FLUENT软件对尿素喷射入烟气的热解和流动进行数值模拟。分别以尿素水溶液的喷射点位置,喷射方向以及烟气量为自变量,分析比较尿素的分解及与烟气的混合均匀性,为还原剂喷射系统的设计提供必要的参考依据。To improve the air pollution situation in Beijing-Tianjin-Hebei region, Beijing municipal government has replaced coal by natural gas in small/medium scale boilers, and required all the gas-burning boilers to achieve a much lower NOx emission limit. Thus, selective catalytic NOx reduction have become the technical choices to flue gas treatment. In these technologies, homogeneous mixing of reducing agent and flue gas is often the key. In this study, the mixing and thermal decomposition process of urea solution injected into a 40/h SZS29-1.6/130/70-Q boiler was numerically simulated by FLUENT. The influences of injection point, injection direction and flue gas amount on mixing uniformity was investigated, with the aim to provide useful information to engineering design.

关 键 词：燃气锅炉 尿素热解 数值模拟 

分 类 号：TU833.11[建筑科学—供热、供燃气、通风及空调工程] X701[环境科学与工程—环境工程]