碱性吸收剂喷射脱除电厂烟气SO_3技术及理论模型  

Theoretical Model for SO_3 Removal from Flue Gas Using Alkali Sorbent Injection Technology in Power Plant

作　　者：姚宣[1] 杨建辉[1] 王洪亮[1] 段威[1] 松鹏[1] 张军[1] 路光杰[1] 郑鹏[1] YAO Xuan;YANG Jianhui;WANG Hongliang;DUAN Wei;SONG Peng;ZHANG Jun;LU Guangjie;ZHENG Peng(Beijing Guodian Longyuan Environmental Engineering Co.,Ltd.,Beijing 100039,China)

机构地区：[1]北京国电龙源环保工程有限公司,北京100039

出　　处：《中国电力》2018年第4期130-135,共6页Electric Power

基　　金：国家科技支撑计划资助项目(2015BAA05B01)~~

摘　　要：碱性吸收剂喷射技术是一种高效脱除电厂烟气中SO_3的新型技术。为推动国内燃煤电厂烟气SO_3脱除技术的发展,介绍了该技术的特点、系统运行特征和原理,建立了SO_3脱除反应理论模型,并对理论模型进行了实践验证。此外,对加入的碱性吸收剂是否会影响脱硝催化剂的活性进行了论证。研究结果表明:(1)碱性吸收剂颗粒终端沉降速度在0.01～0.10 m/s之间,远远小于烟气速度;(2)通过简化气固反应模型得到的理论SO_3脱除效率解析解,与工程实测值偏差在±5%以内;(3)SO_3脱除效率与烟气速度、烟气温度,吸收剂颗粒粒径、吸收剂与SO_3摩尔比等因素相关;(4)在工程设计过程中,将吸收剂与SO_3摩尔比设置在1.5以上,吸收剂粒径选择在30μm以下,吸收剂颗粒停留时间不小于4 s,可保证SO_3脱除效率在80%以上;(5)碱基吸收剂亚硫酸钠对脱硝催化剂的负面影响可忽略不计。Alkaline sorbent injection is a new technology to remove SO3 from flue gas in power plant.In this paper,the technical features,system operation characteristics and principles of SO3 removal using alkaline absorbent are introduced.Meanwhile,the theoretical model of SO3 removal reaction is established and verified through practice.Moreover,the impact of alkaline sorbent on the activity of catalyst is examined.The results show that the terminal settling velocity of absorbent is 0.01~0.1m/s,which is far less than that of flue gas.By simplifying the gas-solid reaction model,the deviation of theoretical SO3 removal efficiency from engineering measurement value is less than±5%,and the SO3 removal efficiency is related to the flue gas velocity,flue gas temperature,particle size,chemical equivalence ratio and so on.In the process of engineering design,in order to ensure the SO3 removal efficiency above 80%,the stoichiometric ratio must be set higher than 1.5,and the particle size of absorbent must be smaller than 30μm,while the retention time of absorbent particles should not be less than 4s.The side effects of sorbent sodium sulfite on denitration catalysts is negligible.

关 键 词：燃煤电厂 烟气 三氧化硫 硫酸雾 碱性吸收剂 亚硫酸钠 

分 类 号：TM621[电气工程—电力系统及自动化] X51[环境科学与工程—环境工程]