Title: Study on evaluation method for the rural solid waste fixed bed gasification using the AHP-FCE based on exergy analysis

Authors: Xuehua Zhou; Xianan Xiang; Chenhua Wang; Zhiya Deng; Deyong Peng; Yongsuo Li; Jun Zhou

Addresses: School of Municipal and Geomatics Engineering, Hunan City University, YiYang City, Hunan Province 413000, China ' School of Municipal and Geomatics Engineering, Hunan City University, YiYang City, Hunan Province 413000, China ' School of Civil Engineering, University of Tianjin, Tianjin City, 300072, China ' School of Municipal and Geomatics Engineering, Hunan City University, YiYang City, Hunan Province 413000, China ' School of Municipal and Geomatics Engineering, Hunan City University, YiYang City, Hunan Province 413000, China ' School of Municipal and Geomatics Engineering, Hunan City University, YiYang City, Hunan Province 413000, China ' School of Municipal and Geomatics Engineering, Hunan City University, YiYang City, Hunan Province 413000, China

Abstract: An analytic hierarchy process-fuzzy comprehensive evaluation method (AHP-FCE) based on exergy analysis is proposed to evaluate the rural solid waste fixed-bed gasification process. The influence of gasification temperature, equivalence ratio (ER) and gasification agent on the gasification evaluation score are studied. Firstly, the exergy efficiency of gasification system is calculated by exergy analysis. Secondly, the AHP method is used to establish the optimal gasification process model, and the weight of the selected evaluation indexes is determined. The evaluation indexes include exergy efficiency, gas production rate, lower heating value (LHV) of producer gas, greenhouse gas emissions and waste residue emissions. Finally, the priority ranking of different gasification processes is obtained by the FCE method. The results show that when the gasification temperature is 1,000°C and the ER is 0.35, the gasification score is the highest. The oxygen/steam gasification is better than steam gasification and air gasification.

Keywords: exergy; AHP-FCE; rural solid waste; gasification; fixed bed.

DOI: 10.1504/IJEX.2023.130363

International Journal of Exergy, 2023 Vol.40 No.4, pp.365 - 391

Received: 31 Jul 2022
Accepted: 22 Aug 2022
Published online: 18 Apr 2023 *

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