燃煤机组尾部烟道三氧化硫脱除数值模拟研究  

Numerical simulation study of sulfur trioxide removal from tail flue of coal-fired unit

作　　者：刘宏芳 吴贤豪 张光学[3] 陈子越 余文南 LIU Hongfang;WU Xianhao;ZHANG Guangxue;CHEN Ziyue;YU Wennan(Zhejiang Zheneng Electric Power Co.,Ltd.,Hangzhou 310000,China;Zhejiang Zheneng Technology Research Institute,Hangzhou 311121,China;Institute of Energy Engineering,China Jiliang University,Hangzhou 310018,China;Hangzhou Quanxin Technology Co.,Ltd.,Hangzhou 310000,China)

机构地区：[1]浙江浙能电力股份有限公司,浙江杭州310000 [2]浙江浙能技术研究院有限公司,浙江杭州311121 [3]中国计量大学能源工程研究所,浙江杭州310018 [4]杭州全信科技有限公司,浙江杭州310000

出　　处：《矿业安全与环保》2023年第6期85-91,共7页Mining Safety & Environmental Protection

基　　金：浙江省火力发电高效节能与污染物控制技术研究重点实验室开放课题(JSYJY-KJFW-2022-015)。

摘　　要：为减少燃煤电厂机组烟道尾气三氧化硫SO_(3)对环境的破坏和对燃煤机组日常运行的不利影响,对SO_(3)的脱除开展模拟研究。以燃煤机组尾部烟道为模拟对象,建立碱性吸收剂溶液吸收SO_(3)多相流全过程反应的数值模型;以碳酸钠Na_(2)CO_(3)溶液为碱性吸收剂,通过该模型研究碱性吸收剂吸收SO_(3)的基本特性,并探究碱性吸收剂各项参数对SO_(3)脱除效率的影响。研究结果表明,Na_(2)CO_(3)在烟道的主要存在方式为固相,烟气温度对SO_(3)脱除效率影响较小,喷枪系统不同布置方案的脱除效率不一,Na_(2)CO_(3)的质量浓度为100 g/L时效果较好,摩尔比与SO_(3)的脱除效率并非线性相关,喷雾粒径为40~70μm、雾化角度为60°时,效果较好。In order to reduce the damage of SO_(3)to the environment and the negative impact on the daily operation of coal-fired power plant units,a simulation study of SO_(3)removal was carried out.First,a numerical model of the whole process reaction of SO_(3)absorption by alkaline absorber in multiphase flow was established using the tail flue of a coal-fired unit as a simulation object.Then the basic characteristics of SO_(3)absorption by alkaline absorber were investigated by using sodium carbonate Na_(2)CO_(3)solution as alkaline absorber,and the effects of various parameters of alkaline absorber on SO_(3)removal efficiency were also investigated by the model.The results show that the main existence mode of Na_(2)CO_(3)in the flue is solid phase,and the flue gas temperature has a small effect on SO_(3)removal efficiency.The removal efficiency of the gun system varies with different arrangements.The removal efficiency is better when the mass concentration of Na_(2)CO_(3)is 100 g/L,and the molar ratio is not linearly correlated with the removal efficiency of SO_(3).When the spray particle size is 40μm to 70μm and the atomization angle is 60°,the effect is better.

关 键 词：燃煤机组 碱性吸收剂 NA2CO3 SO3 数值模拟 

分 类 号：X511[环境科学与工程—环境工程]