Understanding CO<sub>2</sub> decomposition by thermal plasma with supersonic expansion quench

Tao YANG (杨涛); Jun SHEN (沈俊); Tangchun RAN (冉唐春); Jiao LI (李娇); Pan CHEN (陈攀); Yongxiang YIN (印永祥)

doi:10.1088/2058-6272/aaa969

Plasma Science and Technology > 2018 > 20(6): 65502-065502. > DOI: 10.1088/2058-6272/aaa969

Tao YANG (杨涛), Jun SHEN (沈俊), Tangchun RAN (冉唐春), Jiao LI (李娇), Pan CHEN (陈攀), Yongxiang YIN (印永祥). Understanding CO₂ decomposition by thermal plasma with supersonic expansion quench[J]. Plasma Science and Technology, 2018, 20(6): 65502-065502. DOI: 10.1088/2058-6272/aaa969

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Understanding CO₂ decomposition by thermal plasma with supersonic expansion quench

College of Chemical Engineering, Sichuan University, Chengdu 610065, People’s Republic of China

Funds: The authors gratefully acknowledge the funding of National Natural Science Foundation of China (Grant No. 11775155).

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Received Date: November 28, 2017

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Abstract

Abstract

CO₂ pyrolysis by thermal plasma was investigated, and a high conversion rate of 33% and energy efficiency of 17% were obtained. The high performance benefited from a novel quenching method, which synergizes the converging nozzle and cooling tube. To understand the synergy effect, a computational fluid dynamics simulation was carried out. A quick quenching rate of 10⁷ Ks⁻¹ could be expected when the pyrolysis gas temperature decreased from more than 3000 to 1000 K. According to the simulation results, the quenching mechanism was discussed as follows: first, the compressible fluid was adiabatically expanded in the converging nozzle and accelerated to sonic speed, and parts of the heat energy converted to convective kinetic energy; second, the sonic fluid jet into the cooling tube formed a strong eddy, which greatly enhanced the heat transfer between the inverse-flowing fluid and cooling tube. These two mechanisms ensure a quick quenching to prevent the reverse reaction of CO₂pyrolysis gas when it flows out from the thermal plasma reactor^.
- CO₂ conversion,
- thermal plasma,
- CFD,
- quench,
- gas dynamics

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