Influence of Potassic Additives on Sludge Gasification Under Model Flue Gas Atmosphere

In this study, the influence of potassic additives (K 2 CO 3 and biomass ash (BA)) on sludge gasification under model flue gases was investigated. Two model gases consisting of O 2 /CO 2 /N 2 and O 2 /CO 2 /H 2 O/N 2 were used as gasifying agents. Under O 2 /CO 2 /N 2 atmosphere, the lower heating v...

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Bibliographic Details
Published in:Waste and biomass valorization 2020-07, Vol.11 (7), p.3629-3637
Main Authors: Yan, Mi, Lin, Jie, Kanchanatip, Ekkachai, Zhang, Sicheng, Wang, Guobin, Hantoko, Dwi, Wibowo, Haryo, Hu, Yanjun
Format: Article
Language:English
Subjects:
Additives
Ashes
Atmosphere
Carbon dioxide
Cold gas
Dilution
Engineering
Environment
Environmental Engineering/Biotechnology
Flue gas
Free atmosphere
Gases
Gasification
Industrial Pollution Prevention
Original Paper
Potassium carbonate
Reaction time
Renewable and Green Energy
Sludge
Steam
Waste Management/Waste Technology
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Summary:In this study, the influence of potassic additives (K 2 CO 3 and biomass ash (BA)) on sludge gasification under model flue gases was investigated. Two model gases consisting of O 2 /CO 2 /N 2 and O 2 /CO 2 /H 2 O/N 2 were used as gasifying agents. Under O 2 /CO 2 /N 2 atmosphere, the lower heating values (LHV) of produced gas were in a range of 3.07–3.79 MJ/Nm 3 , and cold gas efficiency (CGE) were in a range of 47–66%. When steam was introduced into the gasification atmosphere, the efficiency of the process significantly improved. LHV of the produced gas under O 2 /CO 2 /H 2 O/N 2 atmosphere was in a range of 6.48–7.18 MJ/Nm 3 , and CGE was in a range of 73–88%. K 2 CO 3 had an obvious catalytic effect on sludge gasification process. Additionally, K 2 CO 3 had stronger catalytic effect under steam-free atmosphere and it was better in promoting CO generation when compared with BA. BA exhibited the ability to increase gas yield under steam-free atmosphere, while it only had a slight effect under steam-containing atmosphere. Based on continuous monitoring of gas during gasification process, LHV of the produced gas could be increased by nearly twofold, possibly up to 11.96 MJ/Nm 3 , by controlling the proper reaction time (10–12 min) to prevent the dilution effect from excessive gasifying agents.
ISSN:1877-2641
1877-265X
DOI:10.1007/s12649-019-00644-7