Part-load performance analysis of cogeneration system for engine waste heat recovery

TIAN Hua; JING Dongzhan; WANG Xuan; LIU Peng; YU Zhigang

doi:10.11949/j.issn.0438-1157.20170903

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Part-load performance analysis of cogeneration system for engine waste heat recovery

更新时间：2025-12-10

- Part-load performance analysis of cogeneration system for engine waste heat recovery
- CIESC Journal Issue 2, Pages: 792-800(2018)
- 作者机构：
  
  天津大学内燃机燃烧学国家重点实验室,天津,300350
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20170903
  CLC： K406
- Online First：05 February 2018，
  
  Published：05 February 2018
- 稿件说明：
移动端阅览
TIAN Hua, JING Dongzhan, WANG Xuan, et al. Part-load performance analysis of cogeneration system for engine waste heat recovery[J]. CIESC Journal, 2018, (2): 792-800.
DOI：

TIAN Hua, JING Dongzhan, WANG Xuan, et al. Part-load performance analysis of cogeneration system for engine waste heat recovery[J]. CIESC Journal, 2018, (2): 792-800. DOI： 10.11949/j.issn.0438-1157.20170903.

摘要

回收天然气内燃机的排气余热是提高能源利用率的有效手段。提出一种回收排气余热的朗肯循环耦合吸收式制冷循环的联产系统，并针对内燃机多变工况特点，构建联产系统的变工况仿真模型开展变工况特性研究。结果表明，当内燃机工况从100%下降到40%时，联产系统的当量效率下降2.14%，系统总能效率增量仅下降1.64%，说明此联产系统具有很好的工况适应性。在40%工况下，制冷循环由于溴化锂溶液的结晶而不能正常运行。研究结果为联产系统的实际运行提供理论指导。

Abstract

Recovering exhaust waste heat of gas fuel engines is an effective way to improve energy utilization rate. A cogeneration system inclusive of a steam Rankine cycle and an absorption refrigeration cycle is proposed to recover exhaust waste heat of a gas fuel engine. An off-design simulation model is established to analyze part-load performance of the cogeneration system in connection with the characteristics of variable engine load. The results show that the equivalent efficiency of cogeneration system is reduced by 2.14% when the engine load drops from 100% to 40%. Moreover

the improvement of system's total efficiency reduces by only 1.64%. Therefore

the cogeneration system shows excellent part-load adaptability. It should be noted that the absorption refrigeration cycle cannot operate normally under 40% engine load due to the crystallization of H2O-LiBr solution

which can provide the reference for the practical operation.

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