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

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Abstract

In this study, the influence of potassic additives (K2CO3 and biomass ash (BA)) on sludge gasification under model flue gases was investigated. Two model gases consisting of O2/CO2/N2 and O2/CO2/H2O/N2 were used as gasifying agents. Under O2/CO2/N2 atmosphere, the lower heating values (LHV) of produced gas were in a range of 3.07–3.79 MJ/Nm3, 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 O2/CO2/H2O/N2 atmosphere was in a range of 6.48–7.18 MJ/Nm3, and CGE was in a range of 73–88%. K2CO3 had an obvious catalytic effect on sludge gasification process. Additionally, K2CO3 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/Nm3, by controlling the proper reaction time (10–12 min) to prevent the dilution effect from excessive gasifying agents.

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Acknowledgements

This research work has been supported by the State International Cooperation Project (Project Numbers: 2017YFE0107600 and 2016YFE0202000) and the Zhejiang Natural Science Foundation Project (Project Number: LY17E060005).

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Authors and Affiliations

  1. Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou, 310014, China

    Mi Yan, Jie Lin, Ekkachai Kanchanatip, Sicheng Zhang, Guobin Wang, Dwi Hantoko, Haryo Wibowo & Yanjun Hu

  2. Center of Excellence in Environmental Catalysis and Adsorption, Thammasat University, Pathumthani, 12120, Thailand

    Ekkachai Kanchanatip

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  1. Mi Yan
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  2. Jie Lin
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  3. Ekkachai Kanchanatip
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Correspondence to Ekkachai Kanchanatip.

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Yan, M., Lin, J., Kanchanatip, E. et al. Influence of Potassic Additives on Sludge Gasification Under Model Flue Gas Atmosphere. Waste Biomass Valor 11, 3629–3637 (2020). https://doi.org/10.1007/s12649-019-00644-7

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