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Enhanced geothermal system heat removal working medium and determination method thereof

A technology to determine the method and thermal working medium, which is applied in the direction of instruments, electrical digital data processing, computer-aided design, etc., can solve the problems of not having heat transfer characteristics, and no thermal working medium has been found, so as to increase the production temperature of the system and improve Heat extraction effect, effect of improving heat extraction ability

Active Publication Date: 2021-04-09
TIANJIN UNIV
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Problems solved by technology

As far as the current knowledge is concerned, no use of helium as the heat extraction fluid for enhanced geothermal systems has been found, and most of the current research is a homogeneous working fluid, which does not have the excellent heat transfer characteristics of the mixture of the two working fluids

Method used

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  • Enhanced geothermal system heat removal working medium and determination method thereof
  • Enhanced geothermal system heat removal working medium and determination method thereof
  • Enhanced geothermal system heat removal working medium and determination method thereof

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Embodiment Construction

[0023] The present invention establishes a thermal-hydraulic coupling model of the hot dry rock based on the physical property parameters of the deep hot dry rock thermal reservoir obtained from petrophysical experiments, including temperature, density, thermal conductivity, specific heat, and the like. The heat flow and propagation law between the fissures of the hot dry rock and the heat-absorbing fluid are determined by simulation.

[0024] Firstly, a 50mm×50mm×50mm cube is constructed in Comsol Multiphysics as the rock matrix, and a parametric surface method is used in the middle of the rock matrix to construct a sinusoidal wave-shaped fracture channel with a height of 0.2mm. The fluid flows into the fracture channel along the horizontal direction for heat exchange. The specific shape parameters of the crack channel are:

[0025] (z 1 = 24.9 mm, z 2 =25.1mm)

[0026]

[0027] The physical model of the underground heating part of the enhanced geothermal system adop...

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Abstract

The invention provides a method for determining a heat removal working medium of an enhanced geothermal system, which comprises the following steps of: establishing a hot dry rock thermal-hydraulic coupling model on the basis of physical property parameters of deep hot dry rock thermal storage obtained by a rock physical experiment; constructing a cubic domain of a rock matrix, constructing a fracture channel with sinusoidal fluctuation morphology in the middle of the rock matrix by adopting a parameterized surface method, determining the height of the fracture channel, and enabling fluid to flow into the fracture channel along the horizontal direction for heat exchange; and carrying out analogue simulation by utilizing Comsol Multiphysics to obtain different production temperatures of different working media under the same recharge flow and temperature. According to the method, it is determined that the heat removal working medium capable of obtaining the high production temperature is the mixed working medium obtained by mixing supercritical carbon dioxide and helium according to the mass fraction of 9: 1.

Description

technical field [0001] The invention relates to a heat extraction working medium for an enhanced geothermal system used for the development and utilization of hot dry rock geothermal energy. The heat extraction medium is a mixture of two working fluids, which can achieve a higher production temperature and belongs to dry heat Fields of application of rock geothermal energy. Background technique [0002] The use of geothermal energy is of great significance to make up for the uneven distribution of traditional energy, alleviate the environmental pollution caused by the use of traditional energy, and adjust the energy structure. Geothermal energy is a clean renewable energy with abundant reserves. According to World Energy Council (WEC) estimates, the total available energy of geothermal is 5.4×10 27 J, If only 1% of geothermal energy is used, the energy demand of human beings for 20,000 years can be met. Compared with hydrothermal geothermal resources, hot dry rocks have l...

Claims

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Application Information

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IPC IPC(8): G06F30/28G06F113/08G06F119/08
CPCG06F30/28G06F2113/08G06F2119/08
Inventor 刘雪玲王源铭汪健生牛锦涛付伟娟
Owner TIANJIN UNIV
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