A new geothermal and photothermal combined power generation system

Abstract

The invention relates to a novel geothermal and optothermal cogeneration system, which is characterized by comprising a geothermal evaporator, a solar overheater, a prime motor, a prime motor exhaust port, a working medium compression device, an air-cooling radiator, a liquid storage tank and a working medium booster pump. The solar overheater, the prime motor, the prime motor exhaust port, the working medium compression device, the air-cooling radiator, the liquid storage tank and the working medium booster pump are sequentially communicated with the geothermal evaporator; and the prime motor is respectively communicated with the working medium compression device and the air-cooling radiator through a three-way reversing valve. The invention has the advantages that a substance with a lowboiling point is used as a working medium for power and refrigeration circulation, the medium-temperature and low-temperature geothermal heat can be used as a heat source for evaporation of the working medium, solar energy is adopted as an overheating source for the working medium, and the geothermal evaporator is arranged in a downhole. The circulating working medium is delivered into the evaporator at the bottom of a geothermal well for evaporation to absorb heat of geothermal fluid, geothermal hot water needs not to be pumped to the surface, the evaporation temperature of the working medium can be increased, well backfilling can be eliminated, corrosion and scaling can be reduced, and the service life of the system can be prolonged. Moreover, the system has a simple and reasonable structure and good economical performance in heat for power generation.

Description

technical field [0001] The invention relates to the technical field of synergistic thermal power generation of various low-carbon energy sources, and is a new geothermal and photothermal combined power generation system. Background technique [0002] As a kind of natural energy, geothermal energy has many advantages: large reserves, low carbon, clean, and can be directly used. Its unique advantage for thermal power generation is that it is not affected by the change of day and night during the service life. It can supply continuously and stably; although its reserves are inferior to solar energy and wind energy, it is 170 million times the calorific value of global coal storage. Within 5 kilometers below the earth's land, the total heat content of rocks and groundwater above 15°C reaches 1.05×10 22 A kilojoule is equivalent to 99.5 trillion tons of standard coal. Calculated on the basis of the world's annual consumption of 10 billion tons of standard coal, it can meet the e...

AI Technical Summary

Problems solved by technology

The reasons for this severe asymmetry are, from a technical and economic point of view, first, the high-temperature resources in my country’s geothermal resources, with a temperature higher than 150°C, are limited to a few plateau mountainous areas such as Yangbajing, Yangyi, and Tengchong, Yunnan, and the rest are all high-temperature resources. It is a geothermal resource with a medium temperature of 90°C to 150°C and a low temperature of <90°C. The latter two are used as thermal power generation energy. The enthalpy drop of the working fluid of the steam turbine is very small and the thermal efficiency is very low (only 3% to 6%), so the thermal economy is low. very poor

The second is that the equipment is seriously corroded and will be perforated within a year; the dirt will accumulate very quickly and the pipeline will be blocked within a few years; the immature recharge technology will cause the heat production of geothermal fields to decrease year by year, and the effective service life will rarely exceed 30 years

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