摘要
循环流化床煤气化技术近年来发展迅猛,飞灰中所含的气化残炭是煤气化的副产物,挥发分含量接近零,常规燃烧技术难以利用,实现气化残炭的高效清洁燃烧是煤梯级利用技术路线的重要补充和必要延伸。采用循环流化床预热燃烧技术,利用循环流化床预热室将气化残炭预热到800℃以上,再送入下行燃烧室燃烧,实现了稳定高效燃烧,同时对氮氧化物的排放特性开展了试验研究。结果表明,在循环流化床预热室中气化残炭可以通过预热和部分燃烧将自身温度加热到900℃,在下行燃烧室中可以稳定燃烧,燃烧的最高温度为1 126℃,燃烧效率为95.3%;预热和分级配风相结合的预热燃烧技术可以有效降低气化残炭燃烧NO_x的排放浓度,本试验中NO排放值为102 mg/m^3,燃料N向NO的转化率为7.92%。利用循环流化床预热燃烧技术,实现了气化残炭的高效低NO_x燃烧,为气化残炭燃烧技术的开发和应用提供了试验数据和理论支撑。
The technology of circulating fluidized bed （CFB） coal gasification is developing rapidly in recent years, and residual carbon in fly ash with approximately zero volatile is byproduct. The effective combustion of the residual carbon is an important supplementary to the path of coal cascading technology. The residual carbon was preheated to 800℃ using the CFB preheating technology, then it was transported to a down fired combustor continuing its combustion process. Nitrogen dioxide emissions were analyzed at the same time. The results showed that the residual carbon can be preheated to 900℃ by a CFB preheater with partial combustion, and it can burn well in the down fired combustor; The maximum combustion temperature of the residual carbon in the down fired combustor is 1 126℃and its combustion efficiency is 95.3%; NOxemission values can be declined by the combination of preheating and air classification NO emission value in the exhaust is 102 mg/m3 and the conversion ratio of fuel N to NO is 7.92%. The preheated combustion process can achieve high efficiency combustion and low NOx emission for the residual carbon.
出处
《锅炉技术》
北大核心
2015年第5期39-43,共5页
Boiler Technology
基金
中国科学院战略性先导科技专项(A类)资助(XDA07030100)
关键词
气化残炭
预热燃烧
氮氧化物
residual carbon
preheated combustion
NO emission
