低氧气氛下煤粉燃烧特性  

Combustion characteristic of pulverized coal in hypoxic atmosphere

作　　者：程晓磊 

机构地区：[1]煤科院节能技术有限公司,北京100013 [2]煤炭资源高效开采与洁净利用国家重点试验室,北京100013 [3]国家能源煤炭高效利用与节能减排技术装备重点试验室,北京100013

出　　处：《洁净煤技术》2017年第3期71-75,80,共6页Clean Coal Technology

基　　金：北京市科技计划重大科技成果转化落地培育资助项目(Z161100004816012);煤炭科学技术研究院科技发展基金资助项目(2016JC04)

摘　　要：为研究煤粉低氮燃烧时CO_2成分在低氧含量气氛下对燃烧的作用,在热重分析仪上进行了煤粉低氧气氛下的燃烧试验。通过模拟真实燃烧反应中的反应气氛,研究了O_2/CO_2混合比例、升温速率对煤粉燃烧特性的影响。结果表明,在O_2/CO_2混合气氛下,温度为1 000℃以内均存在着燃烧反应和气化反应的竞争关系。CO_2含量高时,CO_2与煤粉的气化反应对煤粉燃烧反应抑制程度逐渐增加。O_2/CO_2比例降低,煤粉的燃尽温度升高幅度明显,煤粉难以燃尽;煤粉的点火温度受CO_2含量影响不大;升温速率由10℃/min升至20℃/min对煤粉可燃性和着火稳定性提升明显,20℃/min升至30℃/min影响不大。In order to investigate the effect of CO2 component to combustion in the hypoxic atmosphere, while realizing low NO~ combustion of pulverized coal,experiments of coal combustion in hypoxic atmosphere were conducted on thermogravimetric analyzer. To simulate the real reaction atmosphere,effects of different O2/CO2 mixing ratios and heating rates to the combustion characteristic were conducted. The results show that a competitive relation is found between combustion and gasification of coal in the 02/C0： mixing atmosphere, when the reaction temperature is below 1 000 ℃. Higher CO2 content will improve the restriction level of pulverized coal combustion by gasification reaction with coal. Lower 02/C02 mixing ratio will restrain the burnout of coal, while the ignition temperature is hardly impacted by the CO： content. A heating rate improvement of 10 ℃/min to 20 ℃/min will apparently enhance the ignition and combustion stability of coal, while improvement of 20 ℃/min to 30 ℃/min has no such influence.

关 键 词：低氮燃烧 还原气氛 燃烧特性 热重试验 升温速率 

分 类 号：TK16[动力工程及工程热物理—热能工程] X51[环境科学与工程—环境工程]