等离子体辅助煤气化及影响因素

Plasma aided coal gasification and the variables in this process

应用等离子体辅助煤气化反应装置对大同煤进行了实验研究,考察了供气量、供粉速率、发生器输入功率、水蒸气压力以及添加不同质量分数的CaCO3和CaO对煤气化反应的影响,并对不同条件下产品气体的组成进行了分析。实验结果表明,装置的最佳工艺参数为供煤速率150g/m in、供气量18m3/h、等离子体发生器输出功率100kW、水蒸气出口压力0.3M Pa。加入添加剂CaCO3和CaO的质量分数分别为10%和5%时,催化效果最好。根据CaCO3和CaO的实验数据可知,在等离子体辅助煤气化过程中CaCO3起催化作用为主,CO2还原为辅。

In order to investigate the characters of plasma aided coal gasification in the industry-scale equipment, the tests with changing feeding rate, steam output pressure, feeding gas （air） flux, input power of plasma generator and the addictives （ CaO and CaCO3 ） were carded out with Datong coal. The produced gas components were analyzed by gas chromatography. And the optimal process conditions, such as, the feeding rate of 150 g/min, the feeding gas （air or oxygen） flow of 18 m^3/h, the output power of plasma generator of 100 kW, the steam output pressure of 0.3 MPa are obtained. When the contents of CaO and CaCO3 in the whole feed are 10% and 5% respectively, the experimental data show their catalytic effect is the best. Considering the molar mass of CaO and CaCO3 , it is concluded that the catalytic effect of CaO is more important than the reduction of CO2 in the gasification.