Process simulation of coal-direct chemical looping gasification for syngas production

Lang Liu,Jian Yang,Dongran Ma,Qingcai Liu,Yan Cao

doi:10.1039/c7ra10808g

Abstract

The coal gasification process is used in the commercial production of syngas as a means toward the clean use of coal.

Highlights

Syngas, one of the most important energy carriers in sustainable energy systems, can be produced from carbonaceous materials, such as natural gas, oil, coal and biomass.[1,2,3] From these mentioned energy sources, coal has been regarded as the most attractive option, due to its relative rich abundance and low cost
The coal-direct chemical looping gasi cation (CDCLG) system is a promising technology for capturing post-combustion CO2 from power plants, in which the fuel reactor is regarded as the gasi er, producing syngas, and the air reactor is the combustor in the gasi cation process
We focused on a new con guration of chemical looping gasi cation, which featured high but not full carbon conversion in the fuel reactor, with residual carbon being combusted in the air reactor

Summary

Introduction

Chemical looping combustion and gasi cation (CLC&G9) has been suggested to be the most promising technology, which combines the inherent separation of CO2 with a reduced energy penalty.[10,11,12] Oxygen carriers (OC) and replacing air are used as the oxygen source to prevent mixing nitrogen with the CO2 stream. Simulation so ware has been widely employed to investigate the utilization of chemical looping strategies in coal gasi cation processes, such as optimizing syngas productivity, energy balances, the circulation rates of oxygen carriers, the oxygen carrier mass loadings, the carbon burnout, the oxygen partial pressure, etc.[16,17,18]. The coal-direct chemical looping gasi cation (CDCLG) system is a promising technology for capturing post-combustion CO2 from power plants, in which the fuel reactor is regarded as the gasi er, producing syngas, and the air reactor is the combustor in the gasi cation process. We focused on a new con guration of chemical looping gasi cation, which featured high but not full carbon conversion in the fuel reactor, with residual carbon being combusted in the air reactor. We proposed that the char residue should be removed from the gasi cation stage and considered in the combustion stage for the continuation of carbon conversion

Process descriptions

Operating conditions

Results and discussion

Conclusions