Gasification for SNG-power cogeneration using coal as material integrated with calcium looping for enhancing CO2 absorption

This paper studies the conversion of coal to energy vectors (power and SNG) through gasification simultaneously with a chemical looping process from a thermodynamic perspective. Water-gas shift with calcium looping CO2 absorption process is conducted as the substitute of traditional water-gas shift reaction (WGS) with amine sorbents. This novel technology includes six main parts: cryogenic air separation unit (CASU), coal gasification, the water-gas shift process with calcium looping for enhancement of CO2 absorption (WGS-CaL), methanation and heat recovery steam generation (HRSG). WGS-CaL is an efficient method for adjusting the ratio of CO and H2 as well as CO2 capturing. The simulation results are consistent with the industrial data. Moreover, the overall plant energy and economic performance are compared with traditional carbon capture technologies.