Conversion reaction of pure methane under plasma action

• Categories:Company Dynamics
• Author:plasma cleaning machine-surface treatment equipment-CRF plasma machine-Sing Fung Intelligent Manufacturing
• Origin:
• Time of issue:2020-11-11
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(Summary description)As early as the 1930s, Huels, a German company, began to study the pyrolysis of methane thermal plasma to produce acetylene. Methane is discharged in an electric field and transformed into black carbon, acetylene (C2H2), and hydrogen (H2). The key to this process is to make acetylene form and cool to the stable temperature of acetylene in a very short time. Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences has also carried out an amplification test of acetylene produced by natural gas plasma pyrolysis, with a production capacity of over 100T /a. Bao Weiren et al. used arc plasma to pyrolysis methane to produce acetylene, and obtained a small energy consumption of 9.68kW ·h/kg. The use of plasma low pressure cold plasmas for methane dehydrogenation to C2 hydrocarbon began in the early 1990s. Suib and Zerger applied microwave plasma technology to methane coupling reactions.   Methane can be converted to ethane (C2H6), ethylene (C2H4) and acetylene (C2H2) at system pressure of 4x102-6.7 x104Pa, plasma injection power of 40~ 80W, and gas flow rate of 50~500 mL /min. The conversion rate of methane was between 4% and 55%. The selectivity of ethane, ethylene and acetylene was 54%~ 75%, 13%~25% and 0~25%, respectively. Wang Baowei et al. from Tianjin University used asymmetric plasma technology to study the direct conversion of methane into C2 hydrocarbon (the mixture of C2H6, C2H4 and C2H2), and systematically investigated the influence of electrode structure, discharge voltage and reaction gas velocity on the reaction.   The atmospheric pressure DC pulse power supply USES the energy storage capacitor to discharge to the load through the rotating spark gap to generate the pulse high voltage, which has the characteristics of steep rising edge and narrow pulse width, so that the energy can be effectively injected into the reactor, and the energy consumption of the power supply is small. In the study of methane conversion reaction using pulsed corona discharge plasma, the main factors influencing methane conversion rate (Xcu4), C2 hydrocarbon selectivity (Sc2) and yield (Yc1) are plasma pulse peak voltage, electrode spacing and methane gas velocity.