Effect of operating conditions on the performance of riser reactor for oxidative coupling of methane--颗粒学报PARTICUOLOGY

Cai, M., Kong, S., Liu, M., & Lu, C. (2024). Effect of operating conditions on the performance of riser reactor for oxidative coupling of methane. Particuology, 91, 235-248. https://doi.org/10.1016/j.partic.2024.03.007

Effect of operating conditions on the performance of riser reactor for oxidative coupling of methane

Min Cai, Shuangzhu Kong, Mengxi Liu^*, Chunxi Lu

State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, China

10.1016/j.partic.2024.03.007

Volume 91, August 2024, Pages 235-248

Received 4 January 2024, Revised 18 March 2024, Accepted 26 March 2024, Available online 6 April 2024, Version of Record 12 April 2024.

E-mail: liumx@cup.edu.cn

Highlights

• Oxidative reactions occur within acceleration zone and developed flow zone.

• Effect of hydrodynamics on the reactor performance is investigated.

• Optimal operating condition is determined.

Abstract

Oxidative coupling of methane (OCM) is characterized by high temperature and strong heat released. A riser reactor is designed for the OCM process to improve gas-solid contacting and heat transfer. This work illustrates the effect of hydrodynamic conditions and feed gas composition on the performance of an OCM riser reactor. The findings suggest that oxidative reactions predominantly occur within the acceleration zone and developed flow zone. Furthermore, at the low superficial gas velocity accompanied by a high solid circulating rate, the C₂ yield initially increases in the acceleration zone, followed by a decrease in the developed flow zone and deceleration zone. The optimal operating conditions are a specific region corresponding to the solids holdup ranges from 0.015 to 0.02. Moreover, the C₂ yield can be elevated using an appropriate feed mixture.

Graphical abstract

Keywords

Oxidative coupling of methane; Riser; Hydrodynamics; Solids holdup

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