摘要
对深度空气分级改造后的某600 MW四角切圆锅炉运行氧量对出口烟气组分浓度和飞灰含碳量影响开展了现场试验研究。结果表明,(1)深度空气分级下NO_(x)浓度总体处于较低水平;运行氧量从1.5%增加到4.5%,SCR入口NO_(x)浓度基本呈现线性增加。(2)运行氧量从1.5%增加到2.5%,SCR入口CO浓度逐渐降低,但处于较高水平(平均值在3 000 ppm以上);当运行氧量增加到3.0%时,SCR入口CO浓度显著降低到1 000 ppm以下,进一步提高运行到4.5%,CO浓度轻微有所降低。(3)运行氧量从1.5%增加到4.5%,飞灰含碳量也基本呈现线性降低规律。为兼顾燃尽特性、CO排放浓度及燃烧经济性,建议实际运行过程中运行氧量设置在3.0%左右,既可保证燃烧效率又可控制NO_(x)生成。
This paper performs a field test research on the effect of operating oxygen on the flue gas component concentration and carbon content in fly ash at the outlet of a 600 MW tangentially-fired boiler after deep staging-air transformation.The results are shown as follows:(1)NO_(x)concentration is generally at a low level under deep staging-air condition;the NO_(x)concentration at the SCR inlet basically increases linearly when the operating oxygen content increases from 1.5% to 4.5%.(2)When the operating oxygen increases from 1.5% to 2.5%,the CO concentration at the SCR inlet gradually decreases,but still maintains at a high level(the average value above3 000 ppm);when the operating oxygen increases to 3.0%,CO concentration at the SCR inlet decreases significantly below 1 000 ppm;the operating oxygen further increases to 4.5%,and the CO concentration slightly reduces.(3)When the operating oxygen increases from 1.5% to 4.5%,the carbon content in fly ash shows a linear decrease.In order to take into account the burnout characteristics,CO emission concentration and combustion economy,the paper suggests that the operating oxygen be set at about 3.0% in the actual operation,which can not only ensure the combustion efficiency but also control the NO_(x)generation.
作者
蔡宏
马仑
谭鹏
CAI Hong;MA lun;TAN Peng(Shajiao C Power Plant of Guangdong Energy Group Co.,Ltd.,Dongguan Guangdong 523900,China;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan Hubei 430074,China)
出处
《湖北电力》
2022年第2期70-75,共6页
Hubei Electric Power
基金
中国博士后科学基金(项目编号:2019M652639)。
关键词
四角切圆锅炉
运行氧量
烟气成分浓度
飞灰含碳量
tangentially-fired boiler
operating oxygen
flue gas component concentration
carbon content in fly ash
