Numerical simulation of two stage entrained flow coal gasifier with recycled CO2 injection

Kenji Tanno, Hiroaki Watanabe, Hiroki Umetsu, Satoshi Umemoto

Research output: Contribution to conferencePaperpeer-review


In order to reduce CO2 emission from thermal power plants with keeping high thermal efficiency, a new concept of IGCC system, namely oxy-fuel IGCC, is recently proposed. CO2 is recycled in this system, hence the effect of CO2 recycle should be clarified. In this study, the effect of recycled CO2 injection on coal gasifier performance was investigated by means of three-dimensional RANS-based numerical simulation. In calculation of a coal gasifier, coal char gasification and water-gas shift reaction are important phenomena, therefore, the partially active site sharing coal gasification model and detailed chemistry of water-gas shift reaction model were implemented. The results show that recycled CO2 injection promotes coal gasification for the lower oxygen concentration condition in which gaseous concentration temperature is relatively high. On the other hand, for higher oxygen and CO2 concentration condition in which gaseous temperature level is relatively low, it is important that how much the higher gasification reactivity in a gasifier is exploited by optimizing local heat balance. It is essential to locally control exothermic gaseous and endothermic heterogeneous reaction in order to take advantage of recycled CO2 injection in the O2/CO2 blown gasifier system.

Original languageEnglish
Publication statusPublished - Jan 1 2015
EventInternational Conference on Power Engineering, ICOPE 2015 - Yokohama, Japan
Duration: Nov 30 2015Dec 4 2015


OtherInternational Conference on Power Engineering, ICOPE 2015

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology


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