Abstract

This article presents an analysis of the efficiency of the ORC power plant with a wet circulating medium. The power plant is supplied from two heat sources, which are geothermal water streams obtained from the Lower Triassic and Middle Triassic Reservoirs. In the ORC system, it was assumed that one of these streams is directed to the superheater and the other to the evaporator. In the work, two variants of ORC power supply were considered. The first one, in which the maximum stream of water from the Middle Triassic Reservoir ṁg2 = 55 kg/s at a temperature of ${\rm{T}}_{{\rm{g1}}}^2$ = 104°C powers the evaporator, while the water stream from the Lower Triassic Reservoir ṁg1 = 25 kg/s at a temperature of ${\rm{T}}_{{\rm{g1}}}^1$$ = 128°C powers the superheater. In the second variant, the maximum water stream from the Lower Triassic Reservoir ṁg1 = 25 kg/s and a temperature of ${\rm{T}}_{{\rm{g1}}}^1$$ = 128°C feeds the evaporator, while the water stream from the Middle Triassic Reservoir ṁg2 at a temperature of ${\rm{T}}_{{\rm{g1}}}^2$ = 104°C supplies the superheater. In both variants, the geothermal water stream directed to the superheater is the size resulting from ORC plant operation and cannot exceed the maximum flow value for a given geothermal reservoir. The following working substances were taken into account in the analysis: cyclopropane, R143a, R32, propylene, R22, propane, R134a. The analysis carried out showed that in the ORC power plant with a two-source supply the maximum system power was obtained in the case of the first variant for the working medium R143a.

Highlights

  • In recent years, we have been dealing with a constant increase in energy consumption [1]

  • This paper presents the evaluation of ORC power plant efficiency with a wet circulating factor, supplied from two heat sources, i.e. geothermal water obtained from the Lower Triassic Reservoir and the Middle Triassic Reservoir, including two variants of this power supply

  • Having at the disposal heat sources similar to those analyzed in this work, the heat carrier with lower temperature and higher mass stream should be directed to the ORC evaporator, and the heat carrier with a higher temperature to the superheater

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Summary

Introduction

We have been dealing with a constant increase in energy consumption [1]. This paper presents the evaluation of ORC power plant efficiency with a wet circulating factor, supplied from two heat sources, i.e. geothermal water obtained from the Lower Triassic Reservoir and the Middle Triassic Reservoir, including two variants of this power supply. The size of mass stream of geothermal water from the Lower Triassic Reservoir ṁ g1 with the supply temperature Tg11 supplying the superheater was adjusted to the operating parameters of the analyzed ORC plant. The size of this stream was determined from the dependence (7) presented in the calculation methodology, it cannot exceed the maximum mass stream ṁ g=25 kg/s. The condensate liquid by means of circulating pump 4 is conveyed into the preheater 5, where it is heated to the evaporation temperature and the cycle of particular transformations is repeated

System description
Methodology of calculations
Calculation results
Findings
Conclusion
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