燃煤热电厂150 t/h循环流化床锅炉烟气超低排放技术应用  

Application of ultra-low emission technology of a 150 t/h CFB boiler in a coal-fired power plant

作　　者：张忠梅 楼军 盛洪产 周为莉 邹思敏 杨梦亚 李昌旭 吴祖良[2] ZHANG Zhong-mei;LOU Jun;SHENG Hong-chan(Zhejiang Fuchunjiang Environmental Thermoelectric Corporation Ltd, Hangzhou 311418, China)

机构地区：[1]浙江富春江环保热电股份有限公司,浙江杭州311418 [2]浙江工商大学环境科学与工程学院,浙江杭州310012

出　　处：《能源工程》2019年第4期78-82,共5页Energy Engineering

基　　金：浙江省大学生科技创新项目(2017R408013)

摘　　要：某燃煤热电厂采用低氮燃烧+SNCR脱硝+布袋除尘+湿法石灰石-石膏烟气脱硫+湿式静电的工艺对原有烟气净化设施进行改造,以实现烟气超低排放。工程实践表明:改造后脱硫塔出口SO2排放浓度较低,30 d内仅有三个时段超标,平均的SO2排放浓度仅有2.54 mg/m3。在低氮燃烧和SNCR脱硝后,30 mg/m3保证率为57.7%,整体NOx排放浓度偏高。但湿法脱硫塔后NOx浓度显著下降,这可能与燃烧过程掺加污泥有关。除尘效果较为理想,湿电出口所有时段的粉尘浓度都小于3 mg/m3。但实际运行中二次电压控制在35 kV左右,此二次电压下湿电的除尘效果不明显。A coal-fired power plant adopted a process including low NO x combustion + SNCR denitrification + fibre filter + wet limestone-gypsum flue gas desulfurization + wet electrostatics to modify the original flue gas purification facilities to achieve an ultra-low emission standards for flue gas of the coal-fired power plant. Application results showed that: the SO 2 emission concentration at the outlet of the desulfurization tower was lower after modification, and there were only three periods exceeding the standard in the 30 days. At the same time, the 30-day average SO 2 emission concentration was only 2.54 mg/m 3. From the perspective of low-nitrogen retrofit and SNCR performance, the assurance rate of 30 mg/m 3 was 57.7%, and the overall NO x emission concentration was little high. However, there was a significant drop of NO x concentration after the desulfurization tower, which might be related to the combustion process adding sludge. The dust removal effect of the whole dust removal system was ideal, and the dust concentration of all the time at the wet electrostatics outlet was less than 3 mg/m 3. However, in the actual operation, the secondary voltage was controlled at about 35 kV. The effect of dust removal under this secondary voltage was not obvious.

关 键 词：超低排放 湿法脱硫 SNCR 布袋除尘 湿电 

分 类 号：X51[环境科学与工程—环境工程]