摘要
燃煤烟气中SO_3由于其特有的化学性质,一直是国内外燃煤电厂污染物测试的难点之一。参照国内应用广泛的SO_3控制冷凝法,自制了一套SO_3采样系统,在综合考虑烟气SO_3采样过程中的各种影响因素后,通过试验模拟,确定了SO_3控制冷凝法采样系统最佳蛇形管内径、圈径和圈数,以及采样管、过滤器和循环水浴的伴热温度控制,从而提高了SO_3的捕集效率。利用该SO_3采样系统对烟气进行采样,测试燃煤锅炉烟气处理设备对SO_3的脱除能力,分析其影响因素及捕集机理。结果显示:SCR脱硝催化剂对SO_2具有一定的催化作用,且随烟气温度的升高,SO_2/SO_3转化率升高;对于SO_3的脱除效率(各设备进出口浓度对比),干式除尘设备可达80%以上,湿法脱硫设备为35%~40%;湿式电除尘器为70%~75%。
Due to its unique chemical properties,SO3 in coal-fired flue gas has been one of the difficult parts in pollutant testing in coal-fired power plants both at home and abroad.In this article,the SO3 testing system is developed by utilizing the widely used control-condensation method and taking various factors into consideration during the sampling process.The optimal inner diameter,ring diameter and the number of rings of snake-shaped tube in SO3 controlled condensation sampling system are determined through experimental simulation as well as the sampling tubes,the temperature control of filter and circulating water bath to improve the capture efficiency of SO3.This SO3 sampling system has been used to test the removal capability of the flue gas treatment equipment in the coal-fired boiler.The influencing factors and the trapping mechanism on SO3 by sampling the flue gas are also analyzed.It is showed that SCR catalyst had some catalytic effects on SO2,and the conversion rate of SO2/SO3 increases with higher flue gas temperature.As for the removal efficiency of SO3,based on the comparison results of the inlet and outlet concentration between each equipment,the dry dedusting equipment can reach more than 80%,while the wet desulphurization equipment is 35%~40%and the wet electrostatic precipitator is 70%~75%.
作者
杨丁
陈永强
陈威祥
郑芳
林启超
YANG Ding;CHEN Yongqiang;CHEN Weixiang;ZHENG Fang;LIN Qichao(School of Metallurgy,Northeastern University,Shenyang 210100,China;Fujian Longking Co.Ltd.,Longyan 364000,China)
出处
《中国电力》
CSCD
北大核心
2018年第7期157-161,共5页
Electric Power
关键词
燃煤电厂
烟气采样
SO3
控制冷凝法
SO2/SO3转化率
烟气处理设备
SO3脱除能力
coal-fired power plants
flue gas sampling
SO3
controlled condensation method
SO2/SO3 percent conversion
flue gas treatment equipment
SO3 removal ability