Insights into thermodynamic characteristics of CO2/H2O(g) co-assist coke oven gas reforming using steel slag as heat carrier

Wenjun Duan, Xinyuan Dong, Lihua Gao, Zhimei Wang and Junhan Wang

Energy, 2025, vol. 328, issue C

Abstract: The efficient utilization of the coke oven gas and recovery of steel slag waste heat were difficult problem for iron and steel industry. An innovative integrated technology was put forward to produce syngas by CO2/H2O(g) co-assist coke oven gas reforming reaction with steel slag. A thermodynamic analysis based on the Gibbs free energy and exergy-exergy analysis were conducted for providing the theory guidance of practical application. The syngas could be obtained with main components of H2 and CO under the temperature of 1173 K and 0.10 MPa with different CO2/H2O(g). By adjusting the CO2/H2O(g) addition ratio, the yields of H2 and CO in the equilibrium syngas could be tuned to synthesize organic products. The system of coke oven gas reforming reaction with steel slag had well energy and exergy efficiency. The integrated energy efficiency and exergy efficiency were higher than 77 % and 71 %, respectively. The avoidable exergy loss was significantly greater than the unavoidable exergy loss. Economic feasibility of the technology was analyzed and the resulted significant economic benefits. The systematic research and development of CO2/H2O(g) co-assist coke oven gas reforming with steel slag could facilitate the efficient utilization of by-product and heat energy in the iron and steel industry.

Keywords: Thermodynamic; Energy and exergy; Coke oven gas; Steel slag; Co-assist reforming reaction (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:328:y:2025:i:c:s0360544225021541

DOI: 10.1016/j.energy.2025.136512

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