600 MW燃煤机组烟气污染物控制研究  

Study of Flue Gas Pollutant Control in a 600 MW Coal-Fired Unit

作　　者：张志勇[1] 莫华 王猛 帅伟 ZHANG Zhiyong;MO Hua;WANG Meng;SHUAI Wei(Inner Mongolia Electric Power Science&Research Institute,Hohhot 010020,China;Appraisal Center for Environment&Engineering,Ministry of Ecology and Environment of P.R.C,Beijing 100012,China)

机构地区：[1]内蒙古电力科学研究院,内蒙古呼和浩特010020 [2]生态环境部环境工程评估中心,北京100012

出　　处：《中国电力》2022年第5期204-210,共7页Electric Power

基　　金：内蒙古自治区自然科学基金资助项目(2019BS05023);内蒙古电力科学研究院自筹项目(2019-ZC-01)。

摘　　要：以某600 MW超临界燃煤机组为例,研究了燃用高硫、中高灰、特低挥发分煤的W火焰锅炉排放效果。机组采用“选择性非催化还原(selective non-catalytic reduction,SNCR)+选择性催化还原(selective catalytic reduction,SCR)脱硝+配高频电源和旋转电极的双室五电场电除尘器+双塔双循环技术的石灰石-石膏湿法脱硫(3+5层喷淋)”的超低排放技术路线,根据机组分散控制系统(distributed control system,DCS)和连续排放监测系统(continuous emission monitoring system,CEMS)数据,烟囱出口NOx、烟尘和SO2浓度均能稳定达到超低排放水平。SNCR装置运行状态良好,SCR装置氨逃逸较大,最大值为27.51 mg/m^(3),A、B侧超过设计值2.28 mg/m^(3)的概率分别为51.86%和45.96%,原因为脱硝系统浓度场分布不均。脱硫系统浆液密度控制较好,一级塔浆液pH值控制较好,二级塔浆液pH值控制偏低,未发挥出双塔双循环技术的优势。SO_(2)、NO_(x)和烟尘排放强度比2019年全国平均排放强度低48.7%、7.7%和28.9%。Taking a 600MW supercritical coal-fired unit as an example,the ultra-low emissions effect of W-flame boiler burning high sulfur,medium and high ash and low volatile coal was studied.The unit adopts the ultra-low emissions technology route of"selective non-catalytic reduction(SNCR)+selective catalytic reduction(SCR)denitrification,double-chamber five-electric field electrostatic precipitator with high-frequency power supply+rotating electrode,and double-tower double-cycle wet-FGD system(3+5 layer spray)".According to Distributed Control System(DCS)and Continuous Emission Monitoring System(CEMS)data of the unit,NOx,particulate matter and SO_(2) concentrations at chimney outlet can reach ultra-low emission level stably.The SNCR device is in good operating condition.The ammonia escape of SCR device is large,and the maximum ammonia escape reaches 27.51mg/m^(3).The probability of exceeding the designed value of 2.28mg/m^(3) on side A and side B is 51.86%and 45.96%,respectively.The reason is that the concentration field of denitration system is unevenly distributed.The slurry density of desulfurization system is well controlled.The pH value of the slurry in the first tower is well controlled,but the pH value in the second tower is relatively low.The emission intensity of SO_(2),NO_(x) and particulate matter is 48.7%,7.7%and 28.9%lower than the national average emission intensity in 2019.

关 键 词：超低排放 W火焰炉 高硫煤 双塔双循环系统 

分 类 号：X773[环境科学与工程—环境工程]