Pyrolysis of propane to acetylene using high-power rotating arc hydrogen plasma

doi:10.3969/j.issn.0438-1157.2013.11.021

Abstract

Abstract: A theoretical model used for selecting optimum experimental conditions was established by calculation of material and energy balance.Experimental conditions were determined according to this theoretical model.Pyrolysis of propane to acetylene was conducted in 1 MW plasma torch.Carbon hydrogen ratio and specific enthalpy of hydrogen were investigated,because they affected propane conversion efficiency,acetylene yield and specific energy of requirement; and the relationship among them were analyzed.The maximum input power in this experiment was 794.2 kW.The conversion efficiencies of propane were more than 99.8%, the highest concentration of acetylene was 12.65%.The best results of acetylene yield and specific energy of requirement could be found in this experimental range,when carbon hydrogen ratio changed.With the increase of specific enthalpy of hydrogen,there existed an optimum value of acetylene yield,while the value of specific energy of requirement increased.The highest acetylene yield obtained was 85.4% and the lowest specific energy of requirement was 8.85 kW·h·(kg C₂H₂)^-1.The theoretical model could be used for optimizing experimental conditions according to these results.

Key words: hydrogen plasma, rotating arc, propane, pyrolysis, acetylene, high-power

摘要： 通过合理的简化计算,建立了物料与能量衡算模型,优选工艺条件,并进行了MW级旋转弧氢等离子体裂解丙烷制乙炔的实验研究,考察了碳氢比与氢气比焓对裂解反应的影响。实验中输入功率的最大值为794.2 kW,实验结果表明:在实验范围内,丙烷的转化率维持在99.8%以上,裂解气中乙炔的最高含量达到了12.65%;碳氢比增加时,乙炔收率和比能耗均存在最佳点;氢气比焓增加时,乙炔收率存在最佳点,而比能耗则逐渐增加;实验中得到的最高乙炔收率为85.4%,最低比能耗为8.85 kW·h·(kg C₂H₂)^-1。实验结果验证了物料与能量衡算模型可以用于指导工艺条件的优选。

关键词: 氢等离子体, 旋转弧, 丙烷, 裂解, 乙炔, 大功率

CLC Number:

TQ211

SU Baogen, FANG Jianwei, WEN Guangdong, MA Jie, XING Huabin, REN Qilong. Pyrolysis of propane to acetylene using high-power rotating arc hydrogen plasma[J]. , 2013, 64(11): 4039-4045.

苏宝根, 房建威, 闻光东, 马杰, 邢华斌, 任其龙. 大功率旋转弧氢等离子体裂解丙烷制乙炔[J]. CIESC Journal, 2013, 64(11): 4039-4045.

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