Title: Evaluation and comparison of exergy-based resource consumption for fly ash utilisation in a cement clinker production system and landfill disposal

Authors: Yanjing Wang; Suping Cui; Yu Liu; Boxue Sun; Xianzheng Gong; Feng Gao

Addresses: National Engineering Laboratory for Industrial Big-data Application Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China; Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China ' National Engineering Laboratory for Industrial Big-data Application Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China; Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China ' National Engineering Laboratory for Industrial Big-data Application Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China; Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China ' National Engineering Laboratory for Industrial Big-data Application Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China; Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China ' National Engineering Laboratory for Industrial Big-data Application Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China; Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China ' National Engineering Laboratory for Industrial Big-data Application Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China; Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

Abstract: It is unclear whether the utilisation of fly ash as valuable resource is preferable to landfill disposal from the resource perspective. The objective of this study was to evaluate and compare the resource consumption of fly ash utilisation in a cement clinker system compared to landfill disposal. The results indicated that when fly ash is used as substitute for clay, resource-saving potential of clinker system reached 147.47 MJ/t-clinker. The comparative analysis displayed that exergy-based resource consumption is reduced by 2,020.48 MJ when 1 t fly ash used in a clinker system instead of landfill.

Keywords: fly ash; cement clinker; landfill; cumulative exergy demand; CExD; land occupation.

DOI: 10.1504/IJEX.2021.118733

International Journal of Exergy, 2021 Vol.36 No.2/3/4, pp.414 - 429

Received: 10 Mar 2021
Accepted: 06 Jul 2021

Published online: 29 Oct 2021 *

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