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

doi:10.11949/j.issn.0438-1157.20170903

Abstract

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:

TK406

TIAN Hua, JING Dongzhan, WANG Xuan, LIU Peng, YU Zhigang. Part-load performance analysis of cogeneration system for engine waste heat recovery[J]. CIESC Journal, 2018, 69(2): 792-800.

田华, 井东湛, 王轩, 刘鹏, 喻志刚. 基于内燃机余热回收联产系统变工况特性分析[J]. 化工学报, 2018, 69(2): 792-800.

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