热等离子体裂解丙烷制乙炔数学模拟

Numerical Simulation of Propane Pyrolysis to Acetylene by Thermal Plasma

为了对反应器的停留时间进行合理优化,将旋转弧等离子体反应器视为一维平推流反应器网络模型,结合裂解反应动力学模型与反应器流动模型,采用CHEMKIN-PRO对丙烷的裂解过程进行数值模拟,用于分析热等离子体反应器内丙烷的裂解过程中产物的浓度分布及温度分布情况。反应动力学模型分别采用均相反应动力学模型和非均相反应动力学模型。模拟结果表明,包含结焦模型的非均相反应动力学模型与实验结果表现出更好的一致性,随着反应器长度的增加,乙炔浓度存在最佳点。通过降低反应器的停留时间至1.0 ms以下,能有效提升C_2H_2收率。

In order to rationally optimize the residence time of propane pyrolysis process in a thermal plasmareactor, the rotating arc plasma reactor was regarded as one-dimensional plug flow reactor network model toanalyze the concentration and temperature distributions of the propane pyrolysis in the thermal plasmareactor using the pyrolysis reaction kinetic model and the flow model of the reactor to mathematicallysimulate the pyrolysis process of propane by CHEMKIN-PRO software. The plasma pyrolysis process ofpropane was investigated from homogeneous and heterogeneous reaction models, respectively. Thesimulation results indicated that the heterogeneous reaction kinetic model with the soot formation model wasin agreement with the experimental results. With the increase of the reactor length, there was an optimumconcentration point of acetylene and the yield of acetylene could be efficiently improved by reducing theresidence time of plasma reactor to 1.0 ms.