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Waste Heat Recovery Turbine Exhaust Steam Heat Pump

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Waste Heat Recovery Turbine Exhaust Steam Heat Pump ( waste-heat-recovery-turbine-exhaust-steam-heat-pump )

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energies Article Theoretical Design and Analysis of the Waste Heat Recovery System of Turbine Exhaust Steam Using an Absorption Heat Pump for Heating Supply Jinshi Wang , Weiqi Liu, Guangyao Liu, Weijia Sun, Gen Li and Binbin Qiu * State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China; wangjinshi@mail.xjtu.edu.cn (J.W.); liuweiqi1995@stu.xjtu.edu.cn (W.L.); gyliu2012@stu.xjtu.edu.cn (G.L.); s694477433@stu.xjtu.edu.cn (W.S.); gen.li@mail.xjtu.edu.cn (G.L.) * Correspondence: qiubinbin@mail.xjtu.edu.cn; Tel.: +86-029-8266-5408 Received: 26 October 2020; Accepted: 25 November 2020; Published: 27 November 2020 􏰁􏰂􏰃 􏰅􏰆􏰇 􏰈􏰉􏰊􏰋􏰌􏰂􏰍 Abstract: In northern China, many thermal power plants use absorption heat pump to recover low-grade heat from turbine exhaust steam due to the irreplaceable advantages of the absorption heat pump in waste heat recovery. In the process of designing a waste heat recovery system, few researchers have considered the relationship between the design power of the heat pump and the actual heating load of the heating network. Based on the heating load characteristics, this paper puts forward a design idea which uses an absorption heat pump to recover waste heat from a steam turbine exhaust for heating supply. The operation mode of the system for different design powers of the heat pump was stated. An economic analysis model of the waste heat recovery system was proposed, and the optimal design power of the heat pump could be obtained. For a specific unit, the corresponding waste heat recovery system was designed, and various factors affecting the economy of the system were discussed and analyzed in detail. Keywords: absorption heat pump; heating load characteristics; design power; waste heat recovery 1. Introduction Recently, China’s urbanization rate has increased considerably and the demand for heating load has increased sharply, especially in large cities in northern China [1]. As an environmentally friendly, efficient energy conversion method, cogeneration can reduce the emission of pollutants and greatly improve the efficiency of primary energy utilization [2]. The central heating method based on cogeneration has been widely used in many cities. Until now, China’s urban central heating area has reached 8.78 billion square meters, with an annual growth rate of 12% [3], and the increased heating demand is mainly provided by coal-fired cogeneration plants [4]. In order to supply the increasing heating demand, the heating capacity must be improved [5]. However, constructing new thermal power plants in cities is difficult, owing to the restrictions of China’s urban environmental protection policies [6]. At the same time, the existing thermal power plants use large extraction condensing steam turbine units for heating. A great deal of waste heat from low-pressure stage exhaust steam is generally not utilized. Instead, it is discharged into the environment through the circulating cooling water system, resulting in enormous heat loss which accounts for more than 30% of the input energy of the thermal power plant [7,8]. Therefore, the utilization and recovery of waste heat from exhaust steam for heating can save fuel consumption and increase the heating capacity [9]. To date, two methods are mainly used to recover the condensing waste heat from thermal power plants and increase the heating capacity of the heating network substantially [10]. The first method is the low-vacuum operation technology of the steam turbine [9,11,12]. However, the low-vacuum heating operation technology of steam turbines faces two limitations. On the one Energies 2020, 13, 6256; doi:10.3390/en13236256 www.mdpi.com/journal/energies

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