直流等离子体法焦炉煤气制乙炔试验研究

Experimental study on coke oven gas pyrolysis to acetylene on DC-plasma

为替代污染严重的电石法制乙炔工艺,寻求一条洁净化乙炔生产工艺,利用100 k W直流等离子体装置进行了焦化厂焦炉煤气与解析气制乙炔的研究,分析了原料气流量、氢烷比、反应腔体直径对反应指标的影响。结果表明,随着原料气流量增大,焦炉煤气和解析气主要指标变化趋势相同,CH_4转化率、乙炔选择性、乙炔收率提高,能耗下降,其中焦炉煤气CH_4转化率为50.13%~62.95%,乙炔选择性为60.1%~71.3%,乙炔收率为30.1%~44.8%;解析气CH_4转化率为56.65%~69.56%,乙炔选择性为70.05%~83.33%,乙炔收率为39.6%~57.9%。随着氢烷比的提高,CH_4转化率、乙炔选择性和收率下降,且解析气中CO_2和O_2含量较高,促进了CH_4裂解,使解析气反应结果较好,CH_4转化率最高为69.56%,乙炔选择性83.33%,乙炔收率57.96%,乙炔能耗最低为13.66 k Wh/kg。反应腔体直径为16 mm时,反应结果优于直径17 mm。

In order to develop a clean acetylene production technology and reduce the pollution of calcium carbide method,the production of acetylene from coke oven gas and absorbed gas on a 100 k W DC-plasma was investigated.The effects of flow rate,H_2/ CH_4 ratio and reactor diameter on the reaction were analyzed.The results showed that there was a consistent tendency of coke oven gas and adsorbed gas.With the increase of flow rate,the conversion of methane,the selectivity and yield of acetylene were improved,and specific energy of requirement was decreased. The conversion of methane,the selectivity and yield of acetylene for coke oven gas were 50. 13% ~ 62. 95%,60. 1% ~ 71. 3%,30.1% ~ 44. 8%,and the conversion of methane,the selectivity and yield of acetylene for absorbed gas were 56. 65% ~69. 56%,70. 05% ~ 83. 33%,39. 6% ~ 57. 9%.The conversion of methane,the selectivity and yield of acetylene were declined with the increase of H2/ CH_4 ratio,and adsorbed gas had better performance because higher levels of CO_2 and O_2 could improve methane conversion.The conversion of methane,the selectivity and yield of acetylene,and specific energy of requirement were 69. 56%,83. 33%,57. 96%,13.66 k Wh / kg respectively.The results of Φ16 mm reactor was better thanΦ17 mm.