张媛媛,曲江源,张锴

• 1:华北电力大学新能源学院
• 2:华北电力大学热电生产过程污染物监测与控制北京市重点实验室

摘要(Abstract)：

选择性催化还原（SCR）烟气脱硝效率与其内部烟气和还原剂流动的均匀性密切相关。在建立SCR烟气脱硝反应数学模型基础上，采用用户自定义子程序耦合了多组分烟气流动与反应过程；通过比较不同负荷下330 MW等级燃煤机组脱硝性能的实测与模拟数据验证了模型的可靠性和有效性，基于对反应器内烟气和还原剂流动及其反应特性的数值模拟分析，提出了喷氨格栅上游导流板结构优化方案，进而考察了操作条件对NO和NH_3排放质量浓度的影响。结果表明：喷氨格栅来流烟气速度分布的非均匀性是导致烟气与还原剂混合效果较差的主要原因，进而通过调整喷氨格栅上游导流板结构并在烟道壁面增设挡板可将脱硝效率提高约3.37%；为满足NO_x质量浓度为50 mg/m~3及NH_3质量浓度为2.5 mg/m~3的排放限值需选取适宜喷氨量，以所选取SCR烟气脱硝装置为例，当烟气初始NO质量浓度为650 mg/m~3,SCR烟气脱硝系统适宜氨氮摩尔比应约为0.94。

关键词(KeyWords)： 燃煤机组;烟气脱硝;SCR;流场优化;数值模拟

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目（2020YFB0606203）~~

作者(Author): 张媛媛,曲江源,张锴

DOI: 10.19666/j.rlfd.202212216

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