Geothermal power generation system based on full-flow and triangular flash cycle coupling

Abstract

The invention provides a geothermal power generation system based on full-flow and triangular flash circulation coupling. The geothermal power generation system comprises a full-flow circulation system and a triangular flash circulation system. The full-flow circulation system comprises a medium-high temperature expansion machine and a heat exchanger, and a geothermal well, the medium-high temperature expansion machine, the heat exchanger and a recharge well are sequentially connected through pipelines; a throttling valve is arranged on the side, close to the geothermal well, of the pipeline, and a stop valve is arranged on the side, close to the inlet end of the medium-high temperature expansion machine, of the pipeline; a temperature sensor is arranged on the side close to the inlet end of the heat exchanger; the triangular flash circulation system comprises a variable-frequency working medium pump, a flash tank, a two-phase expansion machine and a condenser, and the outlet end of the condenser is sequentially connected with the variable-frequency working medium pump, the heat exchanger, the flash tank and the two-phase expansion machine; and the outlet end of the two-phase expansion machine is connected with the inlet end of the condenser to form a closed loop. According to the geothermal power generation system, heat exchange loss between systems is reduced, the problem that the efficiency of the expansion machine fluctuates due to unstable geothermal energy is effectively solved, and the utilization rate of the geothermal energy is increased.

Description

technical field [0001] The invention relates to the field of geothermal energy utilization, in particular to a geothermal energy power generation system based on the coupling of full-flow and triangular flash cycles. Background technique [0002] At present, the shortage of resources in the world is relatively serious. Although the utilization rate of traditional resources such as coal, oil, and natural gas is high, there are still difficult problems such as polluting the environment and being unable to regenerate. As a big energy-consuming country, our country needs to pay more attention to the utilization of resources. In recent years, as our country has paid more and more attention to the protection of the ecological environment, and based on the sustainable development strategy, the research on the development of renewable and clean energy has also gradually entered the stage. on track. Therefore, it is particularly important to improve the utilization rate of clean ene...

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Problems solved by technology

[0004] The organic Rankine cycle is one of the mainstream cycles for waste heat utilization. In recent years, many scholars have devoted themselves to the research of the organic Rankine cycle, but its thermal efficiency is still about 20%, and has not been improved significantly. Other new power generation cycles, such as Flash evaporation, dry steam power generation, etc., even if the geothermal energy cycle is used, the thermal efficiency cannot be greatly improved, so it is difficult to put it into commercial use

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