Analyzing the Performance of a Dual Loop Organic Rankine Cycle System for Waste Heat Recovery of a Heavy-Duty Compressed Natural Gas Engine
Analyzing the Performance of a Dual Loop Organic Rankine Cycle System for Waste Heat Recovery of a Heavy-Duty Compressed Natural Gas Engine
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分析用于重型压缩天然气发动机余热回收的双回路有机朗肯循环系统的性能
DOI：
10.3390/en7117794
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发表时间：
2014-11
期刊：
影响因子：
3.2
通讯作者：
Yang Kai
中科院分区：
文献类型：
--
作者：
Yao Baofeng;Yang Fubin;Zhang Hongguang;Wang Enhua;Yang Kai
针对某重型压缩天然气发动机(CNGE)的余热回收问题，设计了一种双循环有机朗肯循环(DORC)系统，并对DORC-CNGE联合系统的性能进行了模拟和讨论。DORC系统包括高温(HT)和低温(LT)循环。高温循环从发动机排放的废气中回收能量，而低温循环从进气、发动机冷却液和预热器中的高温循环工质中回收能量。根据热力学第一定律和第二定律建立了系统的数学模型。根据发动机在不同工况下的试验数据，计算了CNGE的余热特性。并以R245fa为工质，对DORC CNGE组合系统的性能进行了仿真分析。结果表明，在发动机额定功率输出条件下，DORC系统的最大净功率为29.37kW，最大热效率为10.81%。与原CNG发动机相比，DORC-CNGE联合系统的最大功率增长率和最大制动比油耗改善率分别为33.73%和25%。
A dual loop organic Rankine cycle (DORC) system is designed to recover waste heat from a heavy-duty compressed natural gas engine (CNGE), and the performance of the DORC CNGE combined system is simulated and discussed. The DORC system includes high-temperature (HT) and low-temperature (LT) cycles. The HT cycle recovers energy from the exhaust gas emitted by the engine, whereas the LT cycle recovers energy from intake air, engine coolant, and the HT cycle working fluid in the preheater. The mathematical model of the system is established based on the first and second laws of thermodynamics. The characteristics of waste heat energy from the CNGE are calculated according to engine test data under various operating conditions. Moreover, the performance of the DORC CNGE combined system is simulated and analyzed using R245fa as the working fluid. Results show that the maximum net power output and the maximum thermal efficiency of the DORC system are 29.37 kW and 10.81%, respectively, under the rated power output condition of the engine. Compared with the original CNG engine, the maximum power output increase ratio and the maximum brake specific fuel consumption improvement ratio are 33.73% and 25%, respectively, in the DORC-CNGE combined system.
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