能源利用

Assessment of Flue Gas Reinjecting Operating Strategy in Performance of CCHP System using Energy Level Difference Analysis

  • WANG Zefeng ,
  • HAN Wei ,
  • LI Yimin
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  • 1. Beijing Huairou Laboratory, Beijing 101400, China 
    2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China

网络出版日期: 2023-11-28

基金资助

This study is supported by the National Natural Science Foundation of China (Grant No. 52006213).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

Assessment of Flue Gas Reinjecting Operating Strategy in Performance of CCHP System using Energy Level Difference Analysis

  • WANG Zefeng ,
  • HAN Wei ,
  • LI Yimin
Expand
  • 1. Beijing Huairou Laboratory, Beijing 101400, China 
    2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China

Online published: 2023-11-28

Supported by

This study is supported by the National Natural Science Foundation of China (Grant No. 52006213).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

摘要

合适的运行策略能够改善分布式冷热电联供系统的变工况性能,提高能源利用效率和降低排放。本文通过品位差图像分析方法确定部分负荷下系统不可逆损失,阐释了烟气回注运行策略下系统能效提升机理。与降低透平入口温度运行策略相比,由于减小了燃气轮机中能量转换过程品位差值,在85%负荷下,烟气回注策略减少了燃气轮机2.62%的㶲损失。当系统输出功率进一步降低,由于压气机进口温度的限制,烟气回注运行策略被降低透平入口温度运行策略所取代。然而,在余热利用装置中,㶲损失与能量品位差的变化规律与燃气轮机相反。引入功冷联供系统作为解决方案。此外,功冷联供系统的引入可以有效扩大系统冷电比的调节范围,改善系统运行的灵活特性。

本文引用格式

WANG Zefeng , HAN Wei , LI Yimin . Assessment of Flue Gas Reinjecting Operating Strategy in Performance of CCHP System using Energy Level Difference Analysis[J]. 热科学学报, 2023 , 32(1) : 125 -134 . DOI: 10.1007/s11630-022-1735-1

Abstract

A proper operating strategy is helpful to improve the off-design performance of combined cooling, heating and power (CCHP) systems, providing high efficiency and low emission. The energy level difference graphic analysis method is used to identify energy level as well as exergy destruction of the part-load process. This method illustrates the energy efficiency upgrading mechanism of the flue gas reinjecting (FGR) operating strategy. It is referenced to a reducing turbine inlet temperature (TIT) operating strategy. By comparison, the FGR operating strategy leads to a 2.62% exergy distribution reduction in a gas turbine at an 85% load level due to the decrease of the energy level difference. When the output power is reduced further, the FGR operating strategy is supplanted by the TIT operating strategy with the limit of compressor inlet temperature. However, the opposite results of exergy distribution are presented in the exhaust-heat recovery devices. A heat-driven refrigeration and power cycle is introduced in a typical CCHP system as a solution. Moreover, the results suggest that the operational flexibility of the CCHP system is improved by enlarging the ratio of cooling to electricity.

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