等离子体煤气化反应器内部流动数值模拟及设计优化的初步研究

本文对一种等离子体煤气化反应器内部湍流、两相流动和燃烧化学反应等复杂流动现象进行了三维数值模拟 ,得出了其内部的温度分布、速度分布和组分浓度分布 ,在对计算结果进行分析的基础上 ,提出了等离子体煤气化反应器的一种优化设计方案 ,并对此方案进行了不同等离子体流速下的数值模拟和比较分析 ,以确定气流参数的最佳匹配 ;数值分析结果表明 :改进的设计方案和气流参数匹配提高了等离子体热源利用的效率和煤气转化的效率

Primary Research on the Flow Simulation and Optimization Design of Plasma Reactors for Coal Gasification

A 3-D numerical simulation system has been developed to analyze the complex flow in plasma reactors for coal gasification,which involves the turbulence,two-phase flow and coal combustion reactions.The velocity field and the associated temperature and concentration distribution have been obtained.On the basis of the analytical results,a different plasma flow configuration scheme has been put forward.Numerical simulations for the new geometry model have been performed under different plasma flow velocities in order to optimize the flow parameters.The numerical results show that the thermal efficiency of plasma source and the conversion ratio of the gasification have been improved with this new scheme and the numerical system can be used for the optimization of the design of the plasma reactors.