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A thermodynamic performance analysis on influence parameters of COG-CCHP based on exergy

Hongbin Zhao (College of Machinery and Transportation Engineering, China University of Petroleum, Beijing, Peoples’ Republic of China and Beijing Key Laboratory of Process Fluid Filtration and Separation, Beijing, Peoples’ Republic of China)
Yu Cao (College of Machinery and Transportation Engineering, China University of Petroleum, Beijing, Peoples’ Republic of China and Beijing Key Laboratory of Process Fluid Filtration and Separation, Beijing, Peoples’ Republic of China)
Chang Liu (College of Machinery and Transportation Engineering, China University of Petroleum, Beijing, Peoples’ Republic of China and Beijing Key Laboratory of Process Fluid Filtration and Separation, Beijing, Peoples’ Republic of China)
Xiang Qi (College of Machinery and Transportation Engineering, China University of Petroleum, Beijing, Peoples’ Republic of China and Beijing Key Laboratory of Process Fluid Filtration and Separation, Beijing, Peoples’ Republic of China)

World Journal of Engineering

ISSN: 1708-5284

Article publication date: 3 December 2018

84

Abstract

Purpose

The purpose of this paper is to investigate the performance of coke oven gas (COG)-combined cooling, heating and power (CCHP) system and to mainly focus on studying the influence of the environmental conditions, operating conditions and gas conditions on the performance of the system and on quantifying the distribution of useful energy loss and the saving potential of the integrated system changing with different parameters.

Design/methodology/approach

The working process of COG-CCHP was simulated through the establishment of system flow and thermal analysis mathematical model. Using exergy analysis method, the COG-CCHP system’s energy consumption status and the performance changing rules were analyzed.

Findings

The results showed that the combustion chamber has the largest exergy loss among the thermal equipments. Reducing the environmental temperature and pressure can improve the entire system’s reasonable degree of energy. Higher temperature and pressure improved the system’s perfection degree of energy use. Relatively high level of hydrogen and low content of water in COG and an optimal range of CH4 volume fraction between 35 per cent and 46 per cent are required to ensure high exergy efficiency of this integration system.

Originality/value

This paper proposed a CCHP system with the utilization of coke oven gas (COG) and quantified the distribution of useful energy loss and the saving potential of the integrated system under different environmental, operating and gas conditions. The weak links of energy consumption within the system were analyzed, and the characteristics of COG in this way of using were illustrated. This study can provide certain guiding basis for further research and development of the CCHP system performance.

Keywords

Acknowledgements

The Project Supported by National Natural Science Foundation of China No. 51274224.

Citation

Zhao, H., Cao, Y., Liu, C. and Qi, X. (2018), "A thermodynamic performance analysis on influence parameters of COG-CCHP based on exergy", World Journal of Engineering, Vol. 15 No. 6, pp. 771-785. https://doi.org/10.1108/WJE-12-2017-0416

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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