Low-temperate geothermal power generation system

Abstract

The invention discloses a low-temperate geothermal power generation system comprising a low-temperature geothermal well vertical shaft, a series pressure energy engine block and a low-speed generator unit. A closed well pipe is arranged in the vertical shaft. A complex liquid working medium is contained in the closed well pipe. The closed well pipe is connected with a gas output pipe through a gas input pipe, the engine block and an exhausted gas output pipe in sequence, so that a closed loop is formed. The engine block is connected with the low-speed generator unit. A liquid working medium condensing box is arranged between the exhausted gas outlet pipe and a gas output pipe. The low-temperate geothermal power generation system has the advantages of being ingenious in structural design, achieving liquid-gas two-phase flow work and operating safely and stably. By the adoption of the low-temperature geothermal power generation system, shallow low-temperature geotherm at the temperature of 30-80 DEG C can be used for generating power, and the well drilling cost and the power generation cost can be reduced; besides, due to a closed well, the well pipe is prevented from being scaled; meanwhile, geotherm instead of water is pumped from a geothermal well, and therefore the low-temperate geothermal power generation system is suitable for generating power through hot dry rock stratums accounting for 99% of geotherm.

Description

technical field [0001] The invention relates to a power generation system, in particular to a low-temperature geothermal power generation system. Background technique [0002] At present, geothermal power stations use relatively high geothermal temperature to generate electricity. According to the national geothermal standard GB11615-89, only when the geothermal temperature is between 90°C and 150°C can it be used for power generation. In other words, there are the following deficiencies: [0003] 1. High cost: When the temperature of existing geothermal power generation needs to reach 90°C-150°C, the drilling depth of the geothermal well will reach about 5,000 meters. Calculated on an average of 2,670 yuan / m, the drilling cost alone will reach 13.35 million yuan / hole, costly. [0004] 2. Double well operation: The existing geothermal power station pumps the hot water in the geothermal well to the ground, generates electricity through energy conversion, and t...

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Problems solved by technology

[0005] 3. Well pipe scaling: due to the large amount of CaCO contained in geothermal water 3 and other minerals, the geothermal water has been in a stable saturated state underground. Once the geothermal power station starts to operate, the temperature and pressure of the geothermal water will change accordingly in the system, making the geothermal water originally in a saturated solution physically If the temperature state of the minerals in the state is broken and becomes a supersaturated solution, precipitation and scaling will occur in geothermal wells, pipelines and equipment, thereby reducing the flow of hot water. In severe cases, pipelines will be blocked and the system will stop operating. problem occurs

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