Abstract
The organic Rankine cycle (ORC) is widely used to recover industrial waste heat. For an ORC system using industrial waste hot water as a heat source, a novel hot water split-flow dual-pressure organic Rankine cycle (SFD-ORC) system is developed to improve the performance of the ORC. The maximum net power output was selected to compare three ORC systems, including basic ORC (B-ORC), conventional dual-pressure ORC (CD-ORC) and SFD-ORC. A genetic algorithm (GA) was used to optimize the parameters to search the maximum net power output of ORCs. The maximum net output power was taken as the standard of performance evaluation. The results show that, under the same hot water inlet temperature condition, the optimal hot water outlet temperature of B-ORC is much higher than that of CD-ORC and SFD-ORC, which indicates that less thermal energy could be utilized to convert to power in B-ORC. The optimal hot water temperature at the outlet of evaporator 1 in SFD-ORC is higher than that in CD-ORC, which means SFD-ORC could make more efficient use of the high-grade thermal energy of hot water. The SFD-ORC could obtain the highest net output power under the optimal parameter conditions, followed by the CD-ORC system, while the B-ORC has the lowest net output power. Moreover, with the increase in the hot water inlet temperature, the advantage of SFD-ORC becomes increasingly obvious. When the hot water inlet temperature is 90 °C, the net output power of SFD-ORC at is 6.22% higher than that of CD-ORC. The net output power of SFD-ORC at 130 °C increases to 9.7% higher than that of CD-ORC. The SFD-ORC presents better system performance and has great engineering application potential.
Highlights
Industrial waste heat recovery technology has attracted great attention because it has great potential in reducing fuel consumption and environmental pollution
According to the previous research [36], the net output power of B-organic Rankine cycle (ORC) is related to the inlet temperature of hot water, ta, the pinch temperature difference of the evaporator, the evaporation temperature, tevap, and the condensation temperature, tcond
The inlet temperature of hot water is an input condition for basic ORC (B-ORC), the condensation temperature is determined by the temperature of cooling water, and the pinch temperature difference is related to the construction of the evaporator
Summary
Industrial waste heat recovery technology has attracted great attention because it has great potential in reducing fuel consumption and environmental pollution. The ORC system is an excellent performance system to recover industrial waste heat in order to generate electric energy or output mechanical power [3,4,5]. Many studies investigated the optimization algorithm for different ORC configurations to improve the thermal efficiency of heat recovery. Özkaraca et al [31] studied the maximum exergy efficiency by simulating the actual air-cooled ORC binary geothermal power plant using an artificial bee colony (ABC) algorithm. Compared with the conventional dual-pressure ORC (CD-ORC), the hot water splits into two flow directions in SFD-ORC to make more efficient use of high-grade thermal energy and obtain more net output power. The genetic algorithm was used to optimize the parameters of ORCs to find the maximum net power output
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