System and method for composite utilization of geothermal energy and solar energy

Abstract

The invention relates to the field of power generation, and aims to organically combine and utilize solar energy and geothermal energy, and provide a system and method for combined utilization of geothermal energy and solar energy. The composite utilization system of geothermal energy and solar energy includes: a turbine, which has a steam inlet and a steam inlet; a geothermal energy heat exchanger, which communicates with the steam inlet of the turbine through a steam inlet; a solar heat exchanger, which passes through The steam inlet pipe is connected to the steam inlet of the turbine; the steam inlet pipe is provided with a steam inlet valve capable of opening and closing the steam inlet pipe, and the steam inlet pipe is provided with a A steam inlet valve; a branch pipe is also provided, one end of the branch pipe communicates with the pipe section of the steam inlet pipe between the steam inlet valve and the steam inlet, and the other end of the branch pipe communicates with the steam supplement pipe. The beneficial effect of the invention is that solar energy and geothermal energy can be efficiently and rationally utilized at the same time.

Description

technical field [0001] The invention relates to the field of power generation, in particular to a combined utilization system and method of geothermal energy and solar energy. Background technique [0002] Geothermal resources are widely distributed, but the quality is different. There are high-temperature thermal fields, medium-high-temperature thermal fields, medium-low temperature thermal fields, and low-temperature thermal fields. my country's geothermal energy grade belongs to medium and low temperature geothermal energy. Because of its low grade, it is difficult to use heat energy. It is generally used for domestic heating, and the use of power generation is not as advantageous as high-temperature geothermal resources. The distribution of solar energy is also extensive, but due to its intermittent day and night, if the power generation system uses solar energy, the investment in energy storage equipment accounts for a very large proportion. [0003] Conventional dual-...

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Problems solved by technology

However, due to the limited heat source quality of geothermal sources, the parameters of low-boiling organic working fluids after heat exchange are still not high. After heating, the temperature of the organic working fluid is around 100°C, the work enthalpy drop section of the organic working fluid is very short, and the turbine power is small

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