摘要
针对环境氧浓度发生变化时,煤粉气流的反应动力学级数和机理都会发生变化的情况,采用一维火焰炉对神木烟煤在富氧条件下的着火机理进行了实验研究.结果表明:采用着火时烟气中CO和CO2体积分数的变化规律来判断煤粉气流的着火是可行的;当环境中氧气体积分数从21%升高到40%时,神木烟煤的着火完成了从均相着火向多相着火的转变,同时随着着火温度的降低,着火时刻烟气中热解产物的含量迅速降低.
Aiming at the fact that the order and mechanism of pulverized coal reaction kinetics vary with the environmental oxygen concentration,experimental studies were carried out on a one-dimensional flame furnace for the ignition mechanism of Shenmu bituminous coal under oxygen-enriched conditions.Results show that it is feasible to judge the ignition behavior of pulverized coal stream according to the variation pattern of volumetric fractions of CO and CO_2 in flue gas. When the volumetric fraction of O_2 in the environment increases from 21% to 40%,ignition of Shenmu bituminous coal changes from homogeneous to heterogeneous type.Meanwhile,with the decrease of ignition temperature,the content of pyrolysis products decreases rapidly.
出处
《动力工程学报》
CAS
CSCD
北大核心
2011年第1期33-36,共4页
Journal of Chinese Society of Power Engineering
关键词
煤粉
富氧
着火机理
一维火焰炉
pulverized coal
oxygen enrichment
ignition mechanism
one-dimensional flame furnace
