Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/143373
Title: A novel real-time monitoring and control system for waste-to-energy gasification process employing differential temperature profiling of a downdraft gasifier
Authors: Chan, Wei Ping
Veksha, Andrei
Lei, Junxi
Oh, Wen-Da
Dou, Xiaomin
Giannis, Apostolos
Lisak, Grzegorz
Lim, Teik-Thye
Keywords: Engineering::Environmental engineering
Issue Date: 2019
Source: Chan, W. P., Veksha, A., Lei, J., Oh, W.-D., Dou, X., Giannis, A., ... Lim, T.-T. (2019). A novel real-time monitoring and control system for waste-to-energy gasification process employing differential temperature profiling of a downdraft gasifier. Journal of Environmental Management, 234, 65-74. doi:10.1016/j.jenvman.2018.12.107
Journal: Journal of Environmental Management
Abstract: A novel, cost-effective and real-time process monitoring and control system was developed to maintain stable operation of waste-to-energy gasification process. It comprised a feedback loop control that utilized the differential temperatures of the oxidation and reduction zones in the gasifier to determine the regional heat-flow (endothermic or exothermic), to assess the availability of oxidizing agent (for instance, air or O2) at the char bed and to calculate the fuel feeding rate. Based on the correlations developed, the air-to-fuel ratio or the equivalence air ratio (ER) for air gasification could be instantaneously adjusted to maintain stable operation of the gasifier. This study demonstrated a simplification of complex reaction dynamics in the gasification process to differential temperature profiling of the gasifier. The monitoring and control system was tested for more than 70 h of continuous operation in a downdraft fixed-bed gasifier with refuse-derived fuel (RDF) prepared from municipal solid wastes (MSW). With the system, fuel feeding rate could be adjusted accurately to stabilize the operating temperature and ER in the gasifier and generate syngas with consistent properties. Significant reductions in the fluctuations of temperature profiles at oxidation and reduction zones (from higher than 100 °C to lower than 50 °C), differential temperatures (from ±200 to ±50 °C) in gasifier and the flow rate (from 16 ± 6.5 to 12 ± 1.8 L/min), composition of main gas components, LHV (from 6.2 ± 3.1 to 5.7 ± 1.6 MJ/Nm3) and tar content (from 8.0 ± 9.7 to 7.5 ± 4.2 g/Nm3) of syngas were demonstrated. The developed gasifier monitoring and control system is adaptable to various types (updraft, downdraft, and fluidized-bed) and scales (lab, pilot, large scale) of gasifiers with different types of fuel.
URI: https://hdl.handle.net/10356/143373
ISSN: 0301-4797
DOI: 10.1016/j.jenvman.2018.12.107
Rights: © 2018 Elsevier Ltd. All rights reserved. This paper was published in Journal of Environmental Management and is made available with permission of Elsevier Ltd.
Fulltext Permission: embargo_20211231
Fulltext Availability: With Fulltext
Appears in Collections:NEWRI Journal Articles

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