Comparative study of alternative ORC-based combined power systems to exploit high temperature waste heat
Comparative study of alternative ORC-based combined power systems to exploit high temperature waste heat
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DOI：
10.1016/j.enconman.2014.10.020
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发表时间：
2015
影响因子：
10.4
通讯作者：
Chengyu Zhang;G. Shu;H. Tian;Haiqiao Wei;Xingyu Liang
中科院分区：
文献类型：
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作者：
Chengyu Zhang;G. Shu;H. Tian;Haiqiao Wei;Xingyu Liang
本文提出了以有机朗肯循环(ORC)为筑底循环回收发动机高温废热的各种联合动力系统。拔顶回收循环包括蒸汽朗肯循环(RC)、布雷顿循环(BC)和温差发电循环(TEG)。在从高负荷到低负荷的五种典型发动机工况下进行了综合评价，并从净输出功率、热效率、回收效率和(火用)效率等多个热力学指标来评价系统性能。此外，还详细讨论了各组分的不可逆性。考虑了ORC系统的R123、R245fa和R600a，分析了工质的影响。考虑到系统的技术经济性，选择了水轮机尺寸参数(SP)和换热能力(UA)作为关键指标。结果表明，与其他两种方法相比，DORC在整个运行区域内具有最高的能量开发能力，在额定工况下燃油经济性提高了5.57%，但其SP和UA值也较大。在相对较低的负载下，TAG-ORC变得很有吸引力。
In this paper, various combined power systems which regard organic Rankine cycle (ORC) as bottoming cycle to recover engine’s high temperature exhaust heat are proposed. The topping recovery cycle includes steam Rankine cycle (RC), Brayton cycle (BC) and thermoelectric generator (TEG). Comprehensive evaluations are conducted under five typical engine conditions, ranging from high load to low load, and system performance is assessed in terms of many thermodynamic indexes, such as net output power, thermal efficiency, recovery efficiency and exergy efficiency. Besides that, the irreversibility of each component is also discussed in detail. R123, R245fa and R600a for ORC system are considered to analyze the influence of working fluids. Considering the system techno-economy, the turbine size parameter (SP) and heat transfer capacity (UA) are chosen as key indicators. The results show that compared with the other two investigated approaches, dual-loop ORC (DORC) possesses the highest energy exploitation capacity under the whole operating region, with a 5.57% increase of fuel economy under the rated condition, but its values of SP and UA are large as well. TEG–ORC becomes appealing while under the relatively low load.