A loop heat pipe geothermal mining system with adjustable working fluid circulation flow

Abstract

The invention discloses a loop heat pipe type terrestrial heat exploitation system with adjustable and controllable working medium circular flow. The loop heat pipe type terrestrial heat exploitation system comprises a casing pipe type loop heat pipe, an earth surface heat exchanger and a liquid storage box. The earth surface heat exchanger and the liquid storage box are both located on the ground. The casing pipe type loop heat pipe comprises an evaporation section, a heat insulation section and a backflow section. The evaporation section is located in a high temperature heat reservoir. The earth surface heat exchanger is provided with a condensation section, and the condensation section and the outside carry out heat exchange. A one-way valve or a steam pump is arranged between the heat insulation section and the condensation section. A one-way throttle valve is arranged between the liquid storage box and the backflow section. The evaporation section, the heat insulation section, the condensation section, the liquid storage box and the backflow section are communicated in sequence end to end. Working medium fluid of the liquid storage box enters the evaporation section through the backflow section, and the liquid working medium fluid entering the evaporation section generates film boiling after absorbing heat. According to the loop heat pipe type terrestrial heat exploitation system, the working medium fluid of the liquid storage box passes through the backflow section, the liquid phase backflow mode and the boiling mode of the evaporation section are controlled, the effective filling factor of the terrestrial heat pipe can be adjusted in real time, and therefore terrestrial heat energy is stably and efficiently extracted.

Description

technical field [0001] The invention relates to geothermal energy mining technology in the field of energy, in particular to a loop heat pipe type geothermal mining system with adjustable working fluid circulation flow. Background technique [0002] Geothermal energy is a clean and renewable energy. The development and utilization of geothermal energy, especially the development of deep geothermal resources, has gradually become one of the key directions of new energy development in the world. At present, the development and utilization of geothermal resources not only includes direct utilization such as heating and planting, but also can realize geothermal cooling and power generation of medium and high temperature geothermal resources. In addition, the development of geothermal resources has also developed from medium and shallow hydrothermal resources to deeper strata such as deep geothermal and hot dry rock resources. [0003] The heat pipe utilizes the phase change of ...

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Problems solved by technology

In addition, the liquid pool accumulated in the evaporation section is too deep, the pressure at the deeper liquid level is higher, and it is in a supercooled state, that is, a non-boiling state. This part of the evaporation section is filled with a non-boiling liquid column. The temperature of the rock reaches equilibrium, so that the large area at the bottom of the evaporation section will not absorb heat from the outside of the tube, resulting in low heat transfer efficiency

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