循环灰为热载体的移动床煤热解室数学模型

Mathematical Model of a Moving-bed Coal Pyrolysis Chamber with Cycling ash Serving as a Heat Carrier

以循环灰为热载体的移动床煤热解室 ,是煤气—蒸汽联产系统中的关键设备。基于煤的干燥与热解子模型、非烧结多孔介质内流动与传热理论、以及固体间接触导热等理论 ,结合“限制粒径”判据 ,建立了移动床煤热解室内煤热解过程的综合数学模型 ,并利用模型对龙口褐煤的热解过程进行了仿真计算 。

A moving-bed coal pyrolysis chamber with cycling ash serving as a heat carrier represents a key equipment item in a coal gas - steam cogeneration system. On the basis of the following factors set up is an integrated mathematical model for a moving-bed coal pyrolysis chamber. The factors include: a sub-model based on coal drying and pyrolysis, the theory of flow and heat transfer in non-sintered porous media as well as the theory of contact heat conduction between solids and the criteria of 'restricted particle diameter'. With the help of the above-cited model a simulation calculation was conducted of the pyrolysis process of Longkou lignite and satisfactory results were obtained.