激光点火煤粒着火的模型分析

本文对颗粒煤在激光加热条件下的着火和燃烧进行了数值模拟。采用的是一个简单的煤粒着火与燃烧的一维模型。该模型采用了热解和双平行反应模型，考虑了煤粒表面的多相反应和气相的基元反应以及气相中的传热与传质。从获得的煤粒表面和气相空间的温度随时间的变化规律，可以判断不同煤种的着火方式。

IGNITION MODEL OF LASER-HEATED SINGLE COAL PARTICLES

We mathematically simulate the ignition and combustion of laser heated single coal particles. Applying a simple coal ignition and combustion one-dimension model whichuse two parallel reaction pyrolysis model and consider multiphase reaction on coal particlesurface and elementary reaction and heat and mass transfer in the gas phase. By solvingenergy equation, continuity equation, and conservative equation, we can get the temperaturefields in the gas phase varying with the time. From these data we can decide the ignitionmode of several kinds of coals. Low volatile Henan lean coal and Laiyang anthracite areof heterogeneous ignition and high volatile Qingshan bituminous coal is of homogeneousignition. From calculation we find that the volatile around the coal is very important to theignition mode. If volatile is bound enough to form a spherical membrane around the coal particle, it can prevent the oxygen to arrive at coal particle surface and then it is homogeneous ignition. Otherwise it is heterogeneous ignition.