A novel hydrogen production system based on the three-step coal gasification technology thermally coupled with the chemical looping combustion process. (5th February 2022)

• Record Type: Journal Article
• Authors: He, Song; Gao, Lin; Dong, Rui; Li, Sheng
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 11(2022)
• Page Start: 7100
• Page End: 7112
• Publication Date: 2022-02-05
• Subjects: Hydrogen production -- Three-step coal gasification -- Chemical looping combustion -- CO2 capture; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.12.050
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Coal gasification technology is a significant process for the coal-based hydrogen production system and is considered as a key technology in the transition to "Hydrogen Economy". To decrease the exergy destruction and enhance the cold gas efficiency of the coal gasification process, a novel three-step gasification technology thermally coupled with the chemical looping combustion process is proposed. And the hydrogen production system with CO2 recovery is integrated based on the three-step gasification technology. Results indicated that the cold gas efficiency of the three-step coal gasification technology is 86.9%, which is 10.1% points enhanced compared with GE gasification technology. Besides, the novel system has an energy efficiency of 62.3%, which is 3.1% higher than that of the reference system. Exergy analysis presented that the employment of the three-step gasification technology contributed to the reduction of system exergy destruction by 4.2%. Furthermore, the energy utilization diagram (EUD) suggested that matching between endothermic reactions and exothermic reactions plays important role in the enhancement of cold gas efficiency. Highlights: A novel three-step coal gasification technology coupled with the chemical looping combustion process is proposed. The cold gas efficiency of the three-step gasification is 86.9%. Hydrogen production system based on the three-step gasification technology is integrated. Cold gas efficiency enhancement can be realized by good matching between exothermic reactions and endothermic reactions.