低温等离子体转化瓦斯制备甲醇工艺参数的实验研究

Technical research on conversion of mine gas to methanol by low temperature plasma

为合理设计低温等离子体转化瓦斯制备甲醇实验,利用自制实验系统分析输入电压、放电频率、气体总流量、瓦斯中甲烷体积分数、水蒸气引入量对甲烷转化率及主要产物产率的影响,构建了甲醇产率与工艺参数关系的非线性回归模型,利用Matlab软件对回归系数及目标函数求解。结果表明,在输入电压75V、放电频率9.8kHz、气体总流量198mL/min、甲烷体积分数35.4%、水蒸气引入量31mL/min的条件下,甲醇产率最高,为2.47%,甲烷转化率为24.05%。各工艺参数对甲醇产率的影响由强到弱依次为输入电压、放电频率、气体总流量、甲烷体积分数、水蒸气引入量。该研究对低温等离子体转化瓦斯制备甲醇实验的优化设计具有借鉴意义。

This paper seeks to investigate the process parameters effects on mine gas conversion to methanol by low temperature plasma. The research involves identifying methanol synthesis from gas by plasma conversion using experimental system;analyzing effects of input voltage, discharge frequency, total gas flow rate, concentration of methane and water vapor intake on methane conversion and main product yield;developing the nonlinear regression model of the relationship between methanol yield and process parameters;and thereby achieving the solution of regression coefficient and object function using Matlab software. The results show that the highest methanol yield(2.47%)and methane conversion rate (24.05%)occur in the case of input voltage 75 V, discharge frequency 9.8 kHz, total gas flow rate 198 mL/min, concentration of methane 35.4%,and water vapor input 31 mL/min;and the influence of process parameters on methanol yield follows the order from strong to weak: input voltage, discharge frequency, total gas flow, concentration of methane and water vapor intake. The study could serve as a reference for optimizing the experiment of gas conversion by low temperature plasma to methanol.