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A non-negative pressure geothermal recharge system and recharge method

A non-negative pressure, geothermal technology, applied in geothermal power generation, collectors using groundwater as working fluid, collector components, etc., can solve the problems of clogging the recharge channel, affecting the heating effect, and difficulty in geothermal dynamic monitoring. , to achieve the effect of prolonging life

Active Publication Date: 2022-03-01
HEBEI GREEN ENERGY GEOTHERMAL DEV CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the negative pressure recharge, the water absorption capacity of the formation is greater than the tail water flow of the system, often resulting in the formation of a vacuum column in the heating system, which affects the heating effect on the one hand, and brings difficulties to geothermal dynamic monitoring on the other hand. For example, the monitoring error of recharge flow is large
Because the conventional negative pressure suppressor will cause air to enter the recharge system, which will cause the water quality of the recharge tail water to change and block the recharge channel, so a device is urgently needed to ensure the pressure balance in the recharge system

Method used

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  • A non-negative pressure geothermal recharge system and recharge method
  • A non-negative pressure geothermal recharge system and recharge method
  • A non-negative pressure geothermal recharge system and recharge method

Examples

Experimental program
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specific Embodiment approach

[0026] A geothermal recharge method with no negative pressure, comprising the following steps:

[0027] S1: The geothermal tail water enters through the geothermal tail water inlet 5 and then enters the steady flow tank 1 through the inlet of the steady flow tank 1, and the flow rate at the inlet of the steady flow tank 1 measured by the first flowmeter 6 is Q 1 ;

[0028] S2: The geothermal tail water gathers in the lower part of the stabilization tank 1 and refills into the geothermal recharge well 7 through the outlet of the stabilization tank 1, the first electric control valve 10 and the second flow meter 11 in sequence, and passes through the second flow meter 11 The measured flow rate at the outlet of the stabilizing tank 1 is Q 2 ;

[0029] S3; judge Q 1 and Q 2 size; when Q 1 ≠Q 2 , the PLC central controller 15 controls the Q by adjusting the opening degree of the first electric control valve 10 1 =Q 2 , to ensure the stable operation of the system, when Q 1...

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Abstract

The invention discloses a non-negative pressure geothermal recharge system and a recharge method, wherein the recharge system comprises a steady flow tank and a nitrogen compensation device. The inlet of the tank is connected to the inlet of the geothermal tail water, a first flow meter is arranged between the inlet of the geothermal tail water and the inlet of the steady flow tank, the outlet of the steady flow tank is connected to the geothermal recharge well, and the The wellhead is provided with a sealed recharge wellhead device and a wellhead pressure gauge, a first electric control valve and a second flowmeter are arranged between the outlet of the steady flow tank and the geothermal recharge well in sequence, and the nitrogen compensation device passes nitrogen gas through the wellhead. The compensation pipelines are respectively connected to the steady flow tank and the geothermal recharge well. The invention converts the unstable pressure at the inlet of the geothermal tail water into a controllable pressure in the steady flow tank by setting the steady flow tank, and adjusts the steady flow through the nitrogen compensation device. The pressure in the tank and the geothermal recharge well is balanced, so as to ensure the steady operation of the recharge system.

Description

technical field [0001] The invention relates to the field of geothermal development, in particular to a non-negative pressure geothermal recharge system and a recharge method. Background technique [0002] Geothermal tail water recharge refers to a technology that reinjects the geothermal fluid whose temperature has dropped after utilization into the thermal reservoir through the recharge well. Geothermal tail water recharge is of great significance to prolong the service life of thermal fields, reduce environmental pollution caused by heating tail water discharge, and prevent land subsidence caused by mining. [0003] According to the different pressure methods of fluid injection into the reservoir, geothermal tail water recharge methods can be divided into pressurized recharge and negative pressure recharge. When the aquifer of the reinjection well has poor permeability and the water absorption capacity of the formation cannot meet the actual recharge demand, external for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24T10/20
CPCF24T10/20F24T2010/56Y02E10/10
Inventor 刘瑞军汪浩卢星辰李笑天王洪亮王荣康秦玉净
Owner HEBEI GREEN ENERGY GEOTHERMAL DEV CO LTD
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