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More flexibility and waste heat recovery of a combined heat and power system for renewable consumption and higher efficiency

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  • Ao, Xuan
  • Zhang, Jing
  • Yan, Rujing
  • He, Yu
  • Long, Chuanyu
  • Geng, Xianxian
  • Zhang, Yan
  • Fan, Junqiu
  • Liu, Tianhao

Abstract

Improving energy efficiency and accommodating renewable energy are effective ways to reduce carbon emissions from hybrid coal-fired combined heat and power (CHP) system. Increasing the waste heat recovery and flexibility of the system is the essence of the two ways. In this study, electric heat pump (EHP) and absorption heat pump (AHP) are integrated into the CHP system to enhance its waste heat recovery and flexibility, achieving these goals. The optimal capacity of AHP is then determined, which aims to maximize waste heat recovery and minimize total costs. Next, an operation optimization model, which accounts for the penalties of renewable energy curtailment and load shedding is proposed. The evaluation indicators of the integrated systems are developed from the feasible operation region and system structure perspectives. Case study on a 350 MW coal-fired CHP system and 375 MW heating load demonstrates the efficacy of the model. The results show that the waste heat recovery rate for the CHP system integrated with an optimal capacity of AHP reaches 40.15 %. The maximum heat-electricity ratio and electricity adjustment capacity of the EHP-CHP system are 1.28 and 1.08 times greater, respectively, than those of the AHP-CHP system when addressing a heating load of 375 MW.

Suggested Citation

  • Ao, Xuan & Zhang, Jing & Yan, Rujing & He, Yu & Long, Chuanyu & Geng, Xianxian & Zhang, Yan & Fan, Junqiu & Liu, Tianhao, 2025. "More flexibility and waste heat recovery of a combined heat and power system for renewable consumption and higher efficiency," Energy, Elsevier, vol. 315(C).
    • Handle: RePEc:eee:energy:v:315:y:2025:i:c:s0360544225000349
    DOI: 10.1016/j.energy.2025.134392
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