46 MW燃煤层燃锅炉中NOx减排与节能提升的试验研究  

Experimental Study on NOx Emission Reduction and Energy Saving Improvement in 46 MW Coal-Fired Layer Combustion Boiler

作　　者：任庚坡 REN Gengpo(Shanghai Energy Saving Center)

机构地区：[1]上海市节能中心

出　　处：《上海节能》2023年第6期825-830,共6页Shanghai Energy Saving

摘　　要：在满负荷46 MW的层燃锅炉上,尝试了三种脱硝工艺并进行了效果对比分析。研究结果显示:采用烟气循环进入炉底一次风的技术,可以有效降低NOx,但是大渣的含碳量从8%提升到16%;采用烟气循环进入炉内,营造还原性气氛,实现NOx的有效降低,同时大渣含碳量与改造前相比,略有降低,该技术可以使层燃锅炉喉口下方烟气温度提升,出现更多的1 000~1 100℃的火焰范围;采用烟气循环进入炉内,并与SNCR协同的技术,可以使整体的脱硝效率达到71.9%;采用烟气循环+SNCR协同,不但可以保证大渣燃尽率,也可以减少21.1%尿素用量。降低了污染物减排的成本,促进了系统的节能,该技术有一定的工业应用价值。Three denitrification processes were attempted and their effects were compared and analyzed on a layer combustion boiler with a full load of 46 MW.The research results show that using the technology of circulating flue gas into the furnace bottom for primary air can effectively reduce NOx,but the carbon content of the large slag increases from 8%to 16%;Adopting flue gas circulation into the furnace to create a reducing atmosphere and effectively reduce NOx,while the carbon content of the large slag is slightly reduced compared to before the transformation.This technology can increase the temperature of the flue gas below the throat of the layer combustion boiler,resulting in more flame ranges of 1000~1100℃;The technology of circulating flue gas into the furnace and collaborating with SNCR can achieve an overall denitrification efficiency of 71.9%;By using flue gas circulation and SNCR synergy,not only can the burnout rate of large slag be ensured,but also the amount of urea used can be reduced by 21.1%.This technology reduces the cost of pollutant emission reduction and promotes energy conservation in the system,which has certain industrial application value.

关 键 词：层燃锅炉 NOX减排 节能 烟气循环 选择性非催化还原(SNCR) 

分 类 号：X701[环境科学与工程—环境工程]