Comparative analysis of biomass and coal based co-gasification processes with and without CO2 capture for HT-PEMFCs |
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| Affiliation: | 1. Department of Chemical Engineering, Faculty of Engineering, Srinakharinwirot University, Nakhon Nayok, 26120, Thailand;2. Department of Chemical Engineering, Faculty of Engineering, King Mongkut''s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand;3. Computational Process Engineering Research Unit, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand;4. Center of Excellence in Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand;1. Department of Chemical Engineering, Faculty of Engineering, King Mongkut''s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand;2. Computational Process Engineering Research Unit, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand;3. Center of Excellence in Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand;1. Department of Civil Engineering, Regional Campus Anna University, Tirunelveli, India;2. Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli, India;3. Institute of Chemistry, Bioscience and Environmental Engineering, Faculty of Science and Technology, University of Stavanger, Norway;4. Department of Environmental Energy Engineering, Kyonggi University, Suwon, Republic of Korea;2. Zhejiang Gongshang University Hangzhou College of Commerce, Hangzhou, 311501, China;3. Islamic Azad University, Karaj Branch, Iran |
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| Abstract: | With the seasonal availability and low energy density of biomass and the high environmental impact of coal, the co-gasification of biomass and coal is an alternative approach facilitating a trade-off between renewable and non-renewable resources. The aim of this study was to investigate hydrogen production from the co-gasification of biomass and coal integrated by means of the sorption-enhanced water gas shift reactor (G-SEWGS) for a high temperature proton exchange membrane fuel cell (HT-PEMFC). The effects of the gasifier temperature, the steam to fuel ratio (S/F ratio), and the equivalence ratio (ER) on the hydrogen production performance and environmental impact of the G-SEWGS were theoretically analysed and compared with the conventional gasifier integrated with the water gas shift reactor (G-WGS) and the sorption-enhanced gasifier integrated with the water gas shift reactor (SEG-WGS). As compared to the conventional water gas shift reactor, the addition of a CaO sorbent in the modified water gas shift reactor not only reduces the amount of the CO2 emission but also leads to an increase in the hydrogen concentration and hydrogen content. The G-SEWGS provides better performance in terms of its fuel processor efficiency and CO2 emission than the G-WGS and the SEG-WGS. Also, the problem of sulphur compound in the hydrogen-rich gas can be reduced by using of the sorption-enhanced water gas shift reactor (SEWGS). The best system exergy efficiency, which was around 22% for the power generation, was determined from the HT-PEMFC integrated with the G-SEWGS. The main exergy destruction of around 70% of the total loss was caused by hydrogen production processes. |
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| Keywords: | Co-gasification Sorption enhanced water gas shift Biomass Coal Exergy analysis |
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