Title: The up-to-date standard about exergy analysis and its implementation example in methanol synthesis process

Authors: Lejun Feng; Zhihao Fu; Xiaohui Chen; Weijia Huang

Addresses: Institute of Engineering Thermophysics, Chinese Academy of Sciences, 11 North Fourth Ring West Road, Beijing 100190, China; Institute of New Energy, Dong Guan, International Innovation and Entrepreneurship Community of Songshan Lake, Dongguan 523000, China ' Institute of Engineering Thermophysics, Chinese Academy of Sciences, 11 North Fourth Ring West Road, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China; Institute of New Energy, Dong Guan, International Innovation and Entrepreneurship Community of Songshan Lake, Dongguan 523000, China ' Guangdong Science and Technology Infrastructure Center, Guangzhou 510030, Guangdong, China ' School of Energy and Power Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Yangpu District, Shanghai City, China

Abstract: As an evaluation tool, exergy analysis method urgently requires the technical standard to perform energy management. However, the update of related standard is rarely found for more than a dozen years. China is issuing the third version of its exergy analysis standard (GB/T 14909-2021). As the members in the drafting group, authors of this work introduce the main amendments made in GB/T 14909-2021. First, the new environmental reference state was established, the new models to estimate the standard exergy and enthalpy of complex fuels were proposed, and the energy grade definition was adopted. Then, this work selected a typical methanol synthesis process as an example of implementing GB/T 14909-2021 for the first time that applies this standard. The rigorous procedure was complied with and the data of material, energy, and exergy balance was obtained. The indexes of energy grade, exergy efficiency, and local exergy loss ratio were evaluated. Finally, some technical measures were proposed to reduce energy loss and to improve the energy consumption level of the system. This implementation example can be referred to for other similar cases of energy and chemical industrial system.

Keywords: exergy analysis; standardisation; energy grade; methanol synthesis process.

DOI: 10.1504/IJEX.2023.135850

International Journal of Exergy, 2023 Vol.42 No.4, pp.364 - 382

Received: 21 Apr 2023
Accepted: 06 Jul 2023
Published online: 08 Jan 2024 *

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