Gas switching reforming (GSR) for power generation with CO2 capture: Process efficiency improvement studies

This paper presents the process improvement studies of a combined cycle power plant integrated with a novel gas switching reforming (GSR) process for hydrogen production with integrated CO2 capture. The overall process is denoted as GSR-CC (gas switching reforming-combined cycle). Five cases are pre...

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Bibliographic Details
Published in:Energy (Oxford) 2019-01, Vol.167, p.757-765
Main Authors: Nazir, Shareq Mohd, Cloete, Jan Hendrik, Cloete, Schalk, Amini, Shahriar
Format: Article
Language:English
Subjects:
Combined cycle power plant
Gas-switching reforming
Heat integration
Net electrical efficiency
Pre-combustion capture
Process improvement
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Summary:This paper presents the process improvement studies of a combined cycle power plant integrated with a novel gas switching reforming (GSR) process for hydrogen production with integrated CO2 capture. The overall process is denoted as GSR-CC (gas switching reforming-combined cycle). Five cases are presented in which a systematic approach was adopted to improve the net electrical efficiency of the GSR-CC process. Two cases focus on reducing the number of unit operations and the other three cases focus on heat integration. The net electrical efficiency of the base case GSR-CC process is 45.8% whereas the improved GSR-CC has a net electrical efficiency of 51.1%. The efficiency penalty in the improved GSR-CC process is only 7.2 %-points with respect to the reference case natural gas combined cycle power plant without CO2 capture, and is less than post-combustion capture methods presented in literature. The CO2 avoidance in the GSR-CC is more than 95%. GSR-CC also gives a flexibility in the output from the plant in terms of pure H2 or electricity and the optimal plant configuration is designed to maximize this flexibility. •Process modelling of the gas switching reforming-combined cycle (GSR-CC) power plant is presented.•Efficiency is improved through power cycle modifications and heat integration.•The best performing configuration shows an energy penalty of only 7.2 %-points.•GSR-CC outperforms post-combustion capture in efficiency and CO2 avoidance.•GSR-CC also allows for flexibility between electricity and pure H2 production.
ISSN:0360-5442
DOI:10.1016/j.energy.2018.11.023