储能科学与技术

• 储能系统与工程 •    

耦合低温余热的HP-ORC热泵储电系统热经济性能研究

冯军胜1(), 严亚茹1, 王璐1, 赵亮2, 董辉2()   

  1. 1.安徽建筑大学环境与能源工程学院，安徽 合肥 230601
    2.东北大学冶金学院，辽宁 沈阳 110819
  • 收稿日期:2024-11-21 修回日期:2024-12-30
  • 通讯作者: 董辉 E-mail:fjsheng076@163.com;Dongh@mail.neu.edu.cn
  • 作者简介:冯军胜（1988—），男，博士，副教授，从事烧结余热回收利用、新型热力循环等方面的研究，E-mail：fjsheng076@163.com；
  • 基金资助:
    国家自然科学基金资助项目(51974087);安徽省高等学校科学研究项目(2022AH050262);安徽省自然科学基金资助项目(1908085QE203)

Research on thermal economic performance of HP-ORC pumped thermal energy storage system coupled with low-temperature waste heat

Junsheng FENG1(), Yaru YAN1, Lu WANG1, Liang ZHAO2, Hui DONG2()   

  1. 1.School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, Anhui, China
    2.School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
  • Received:2024-11-21 Revised:2024-12-30
  • Contact: Hui DONG E-mail:fjsheng076@163.com;Dongh@mail.neu.edu.cn

摘要：

针对钢铁行业低温烟气余热利用率低的现状，本文提出一种耦合低温余热的热泵-有机朗肯循环（HP-ORC）系统，并构建系统热力学模型和经济模型。设定R601a为热泵（HP）循环工质，并选取R1233zd(E)、R600a、R1336mzz(Z)、R1224yd(Z)作为有机朗肯循环（ORC）工质，研究不同ORC工质条件下HP冷凝温度、储热温度和ORC蒸发温度对HP-ORC系统热经济性能的影响。研究结果表明，降低HP冷凝温度、提高储热温度和ORC蒸发温度都可提高HP-ORC系统的功率效率（ηP2P）和㶲效率（ηex），而系统总的单位温度传热量（QUA）随着HP冷凝温度和储热温度的升高先减小后增大，随着ORC蒸发温度的升高而逐渐增大，且呈非线性增长的趋势。以工质R1233zd(E)为例，当HP冷凝温度升高2℃时，HP-ORC系统ηP2P和ηex分别平均减小1.54%和0.58%；当储热温度升高2℃时，系统ηP2P和ηex分别平均增加0.4%和0.15%；当ORC蒸发温度升高2℃时，系统ηP2P和ηex分别平均增加0.93%和0.64%。当系统热力学参数相同时，ORC子系统中工质R1233zd(E)具有最大的ηP2P和ηex，但采用R1233zd(E)作为ORC工质时系统经济性能相对较差，说明热力性能最好的工质可能不具有良好的经济性能。在实际操作过程中，存在适宜的热力参数和循环工质使得HP-ORC系统获得较大的ηP2P和ηex和较小的QUA。

关键词: 余热回收, 热泵, 有机朗肯循环, 热力学性能, 经济性能

Abstract:

Aiming at the current situation of the low waste heat utilization rate from low-temperature flue gas in the steel industry, the coupling system of heat pump-Organic Rankine cycle (HP-ORC) for low-temperature waste heat recovery was proposed in the current study, and the system thermal and economic models were constructed. The R601a was set as the circulating working medium of heat pump (HP), and the R1233zd(E), R600a, R1336mzz(Z), R1224yd(Z) were selected as the working mediums of organic Rankine cycle (ORC). The effects of HP condensation temperature, heat storage temperature and ORC evaporation temperature on the thermal economic performance of HP-ORC system under various ORC working mediums were investigated. The results indicate that decreasing HP condensation temperature and increasing heat storage temperature and ORC evaporation temperature could enhance the power-to-power efficiency (ηP2P) and exergy efficiency (ηex) of HP-ORC system, while the total heat transfer capacity per unit temperature (QUA) of HP-ORC system first decreases and then increases as the HP condensation temperature and heat storage temperature increase. Furthermore, the QUA of HP-ORC system increases gradually with the increase of ORC evaporation temperature, and the variation trend is nonlinear. Taking working medium with R1233zd(E) as an example, the ηP2P and ηex of HP-ORC system decrease the average of 1.54% and 0.58% respectively when the HP condensation temperature increases by 2℃. When the storage temperature increases by 2℃,the ηP2P and ηex increase the average of 0.4% and 0.15%, respectively. When the ORC evaporation temperature increases by 2℃, the ηP2P and ηex increase the average of 0.93% and 0.64%, respectively. For the fixed the thermal parameters of HP-ORC system, the working medium with R1233zd(E) has the largest ηP2P and ηex in the ORC subsystem, but the system economic performance is relatively poor by using the R1233zd(E) as the ORC working medium, which means that the working medium with the best thermal performance may not have good economic performance. In the actual operation process, there are suitable thermal parameters and circulating working medium, which make the HP-ORC system obtain the larger ηP2P and ηex and smaller QUA.

Key words: Waste heat recovery, Heat Pump, Organic Rankine Cycle, Thermal performance, Economic performance

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