CIESC Journal ›› 2018, Vol. 69 ›› Issue (2): 792-800.DOI: 10.11949/j.issn.0438-1157.20170903

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

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

  1. State Key Laboratory of Engines, Tianjin University, Tianjin 300350, China
  • Received:2017-07-13 Revised:2017-09-27 Online:2018-02-05 Published:2018-02-05
  • Supported by:

    supported by the National Natural Science Foundation of China (51676133).

基于内燃机余热回收联产系统变工况特性分析

田华, 井东湛, 王轩, 刘鹏, 喻志刚   

  1. 天津大学内燃机燃烧学国家重点实验室, 天津 300350
  • 通讯作者: 田华
  • 基金资助:

    国家自然科学基金项目(51676133)。

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.

Key words: waste heat recovery, Rankine cycle, absorption refrigeration cycle, mathematical modeling, part-load, crystallization

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。

关键词: 余热回收, 朗肯循环, 吸收式制冷循环, 数学模拟, 变工况, 结晶

CLC Number: