Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (5): 903-913.doi: 10.1016/j.cjche.2016.04.039

• Fluid Dynamics and Transport Phenomena • Previous Articles     Next Articles

CFD simulations of quenching process for partial oxidation of methane: Comparison of jet-in-cross-flow and impinging flow configurations

Xinyu Yu, Tianwen Chen, Qi Zhang, Tiefeng Wang   

  1. Beijing Key Laboratory of Green Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2016-01-07 Revised:2016-04-03 Online:2018-05-28 Published:2018-06-29
  • Contact: Tiefeng Wang,E-mail
  • Supported by:

    Supported by the National Natural Science Foundation of China (21276135) and the Project of Chinese Ministry of Education (113004A).

Abstract: A new quenching process using the cold pyrolysis gas has been proposed for the partial oxidation (POX) of methane to recover the heat. The mixing of hot product gas and cold pyrolysis gas in milliseconds is critical to this new approach. Two most widely-used rapid mixing configurations, i.e. the jet-in-cross-flow (JICF) and impinging flow configurations, are compared in terms of mixing and quenching performances using computational fluid dynamics (CFD) coupled with detailed reaction mechanism Leeds 1.5. The mixedness, residence time distribution, temperature decreasing rate and loss ratio of acetylene during the quenching are systematically studied. The results show that the impinging flow has a more uniform mixing and narrower residence time distribution than the JICF. However, the temperature decreasing rate of the mainstream is faster in the JICF than in the impinging flow. The loss ratio of acetylene in the quenching process is 2.89% for the JICF and 1.45% for the impinging flow, showing that the impinging flow configuration is better and feasible for the quenching of POX of methane.

Key words: Jet-in-cross-flow, Impinging flow, CFD simulations, Mixing behavior, Quenching of partial oxidation process