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Effect of reactant types (steam, CO 2 and steam + CO 2 ) on the gasification performance of coal using entrained flow gasifier
Author(s) -
Shahabuddin M.,
Bhattacharya Sankar
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6475
Subject(s) - syngas , wood gas generator , heat of combustion , char , integrated gasification combined cycle , chemical engineering , coal , coal gasification , carbon fibers , waste management , materials science , chemistry , combustion , hydrogen , organic chemistry , composite material , composite number , engineering
Summary This study investigates the gasification behaviour of bituminous coal using different reactants of CO 2 , steam and a mixture of CO 2 and steam under entrained flow gasification conditions at temperatures of 1000°C and 1200°C with atmospheric pressure. The major gas constituents of the syngas were measured using online micro‐GC with a model number Varian 490, whereas the minor pollutant gases were analysed using Kitagawa gas detection tubes. A maximum carbon conversion of 86% was achieved under steam gasification at a temperature of 1200°C compared to 74% from CO 2 gasification. The higher carbon conversion from steam gasification is due to the higher gasification reactivity than CO 2 gasification. At 1000°C, the lower heating value (LHV) from steam gasification was determined to be 60%, 70% and 80% higher than that of CO 2 gasification using the reactant concentrations of 10, 20 and 40 vol.%, respectively. Using a stoichiometric 50/50 ratio of CO 2 and steam, the yield of H 2 , CO and CH 4 were increased by 56%, 106% and 35% compared to that of pure CO 2 gasification. At 1000°C, the LHV under mixed reactant condition is close to the LHV from the pure steam gasification at 1200°C. In steam gasification, increasing the temperature by 200°C from 1000°C decreases the LHV by 17 and 10% using 10 and 20 vol.% steam. The higher heating value from steam gasification is due to the H 2 and CH 4 ‐rich syngas compared to CO‐rich syngas in CO 2 gasification. The BET surface area of the solid char from steam gasification is about 17 and two times higher than that of CO 2 gasification at 1000°C and 1200°C, respectively.