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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.
In view of the change of the oxygen concentration in the environment, the reaction kinetic series and the mechanism of the pulverized coal flow will change. One-dimensional flame furnace is used to study the ignition mechanism of Shenmu bituminous coal under oxygen-enriched condition. The results show that: It is feasible to judge the ignition of the pulverized coal airstream when the flue gas is ignited by changing the volume fraction of CO and CO2. When the oxygen content in the environment increases from 21% to 40%, the ignition of Shenmu bituminous coal is completed from the homogeneous ignition The transition to multi-phase ignition, at the same time as the ignition temperature decreases, the ignition time, the rapid reduction of pyrolysis products in the flue gas.