Gradient utilization enhanced hot dry rock geothermal system

A hot dry rock, enhanced technology, applied in the field of enhanced hot dry rock geothermal system, can solve the problems of low utilization rate and poor stability of the geothermal system, avoid damage to pipelines and heat exchange devices, reduce energy waste, and improve utilization rate effect

Pending Publication Date: 2020-04-10
河南省城乡规划设计研究总院股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies in the above-mentioned background technology, the present invention proposes an enhanced hot dry rock geothermal system with cascaded utilization, which solves the technical problems of low utilization rate and poor stability of the existing geothermal system

Method used

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  • Gradient utilization enhanced hot dry rock geothermal system
  • Gradient utilization enhanced hot dry rock geothermal system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, a kind of enhanced hot dry rock geothermal system of cascade utilization, such as figure 1 As shown, it includes the production well pipeline 12 and the reinjection well pipeline 14 connected with the underground hot dry rock. The production well pipeline 12 and the reinjection well pipeline 14 are connected or hydraulically fractured in the dry hot rock formation through the formation of the pipeline or through the formation void connection. The connection realizes communication, and the artificial heat reservoir 13 of low hot dry rock is established. The clean water source is used as the heating medium to inject into the reinjection well pipeline 14, and the working medium exchanges energy with the high-temperature rock mass in the hot dry rock artificial thermal reservoir 13, and then is extracted from the well for utilization.

[0021] The production well pipeline 12 and the reinjection well pipeline 14 are sequentially connected with a first-stage pla...

Embodiment 2

[0025] Embodiment 2, a kind of enhanced hot dry rock geothermal system of cascade utilization, such as figure 2 As shown, there is one production well pipeline 12 and at least two reinjection well pipelines 14 . The water injection pump 11 is arranged between the water return end of the three-stage plate heat exchanger 6 and the water separator 15 , and the water injection pump 11 can be used to pump water to multiple recharge well pipes 14 .

[0026] The method of multiple reinjection well pipelines 14 and one or a small number of production well pipelines 12 effectively avoids the shortcoming of unstable system operation for a period of time, and multiple reinjection well pipelines can be selected to be used at the same time or only through the water divider 15 one.

[0027] Other structures of this embodiment are the same as those of Embodiment 1.

Embodiment 3

[0028] Embodiment 3, an enhanced hot dry rock geothermal system for cascade utilization, a four-stage plate heat exchanger 8 is arranged between the three-stage plate heat exchanger 6 and the reinjection well pipeline 14, through which the four-stage plate heat exchanger The device 8 makes full use of the 40°C-45°C working fluid from the three-stage plate heat exchanger 6.

[0029] The heat exchange end of the four-stage plate heat exchanger 8 is connected with a heat pump unit 7 , and the heat pump unit 7 is connected with the radiant heating module 3 . The heat energy generated by the four-stage plate heat exchanger 8 and the heat energy generated by the heat pump unit 7 work together to provide auxiliary heat to the radiant heating module 3 to prevent the situation that the three-stage plate heat exchanger 6 cannot meet the normal use of the radiant heating module 3 .

[0030]The water separator 15 is arranged between the return water end of the four-stage plate heat exchan...

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Abstract

The invention discloses a gradient utilization enhanced hot dry rock geothermal system. The gradient utilization enhanced hot dry rock geothermal system comprises a production well pipeline and recharge well pipelines which are connected with underground hot dry rock, wherein a first-stage plate heat exchanger, a second-stage plate heat exchanger, a third-stage plate heat exchanger and a water injection pump are sequentially connected between the production well pipeline and the recharge well pipelines; the heat exchange end of the first-stage plate heat exchanger is connected with an organicRankine cycle generator set; the heat exchange end of the second-stage plate heat exchanger is connected with a heating module; and the heat exchange end of the third-stage plate heat exchanger is connected with a radiation heating module. The gradient utilization enhanced hot dry rock geothermal system effectively avoids the defect that the system is unstable after running for a period of time, and can select a plurality of recharge well pipelines to be used simultaneously or only one recharge well pipeline can be used through a water distributor. The gradient utilization enhanced hot dry rock geothermal system fully utilizes hot water of each temperature section, adopts multi-stage utilization modes such as power generation, heating and floor heating radiation, fully utilizes working media of each temperature range, can utilize heat energy of the hot dry rock to the maximum extent, reduces unnecessary energy waste, and improves the utilization rate of the whole system.

Description

technical field [0001] The invention relates to the technical field of geothermal systems, in particular to an enhanced hot dry rock geothermal system for cascade utilization. Background technique [0002] The enhanced geothermal system is a common method to utilize the thermal energy of hot dry rocks. Hot dry rocks are distributed all over the world. According to data from the China Geological Survey, the total amount of hot dry rock resources at a depth of 3-10km in mainland China is 2.5*10 25 J (856 trillion tons of standard coal), if 2% can be mined and utilized, it is equivalent to 5300 years of use based on the total national one-time consumption in 2010 (3.25 billion tons of standard coal). Moreover, the enhanced geothermal system utilizes hot dry rock, which has many advantages such as sustainability, environmental protection, and not being affected by day and night. The traditional enhanced geothermal system uses hot dry rock, and generally adopts a one-to-one prod...

Claims

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Application Information

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IPC IPC(8): F24T10/20F24D11/02
CPCF24D11/0214F24T10/20Y02B10/40Y02E10/10
Inventor 范运泽袁培申秀乾张忠林杨德民尹卫红麻永建雷正霖丁雪琳
Owner 河南省城乡规划设计研究总院股份有限公司
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