Geothermal tail water recharging device
By mixing the geothermal water in the geothermal water with the tail water in the reflow tank in the geothermal tail water in the geothermal tail water in the geothermal tail water refilling device, the tail water temperature is increased, and the heat energy waste and system imbalance caused by too low temperature during the geothermal tail water refilling process is solved, ensuring the normal production capacity of the geothermal field.
Patent Information
- Application Number
- CN202421989156.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-16
AI Technical Summary
During the process of geothermal tail water recharge, the temperature of the tail water is low, resulting in a decrease in the thermal storage of geothermal wells, resulting in waste of heat energy, and may cause imbalance in the geothermal system and affect the production capacity of geothermal fields.
A geothermal tail water recharge device is designed. By installing an external pipe between the geothermal pipe and the reflow tank, a part of the geothermal water in the geothermal pipe is transported to the reflow tank, mixed with the tail water, and raising the tail water temperature. The device is equipped with a mixing plate, a temperature sensor and a flow regulating valve to ensure that the tail water temperature meets the return injection standard and avoids waste of heat and system imbalance.
By mixing geothermal water and tailwater, the tailwater temperature is increased, heat waste and thermal storage of geothermal wells are avoided, and the balance of the geothermal system and the normal production capacity of geothermal fields are ensured.
Smart Images
Figure CN222912005U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of geothermal tail water treatment, and particularly relates to a geothermal tail water reinjection device. Background Technique
[0002] When a geothermal well is exploited, some combustible geothermal associated gases composed of methane, ethane, propane and other gases with low production, difficult to store and direct discharge wasting resources and polluting the environment will be exploited together. The treatment of these "embarrassing" geothermal associated gases is also a difficult problem in the exploitation of geothermal wells. At the same time, when using geothermal energy, in order to avoid thermal pollution and chemical pollution caused by direct discharge of geothermal wastewater and to maintain the heat storage pressure, it is necessary to reinject geothermal tail water.
[0003] At present, the geothermal tail water reinjection device usually directly introduces geothermal tail water into the reinjection well by using a reinjection pipe. During the reinjection process, the temperature of the geothermal tail water is relatively low. When directly introduced into the reinjection well, it is easy to cause a decrease in the heat storage of the geothermal well, resulting in waste of thermal energy. Moreover, when this low-temperature tail water is reinjected too quickly, it is extremely easy to cause imbalance of the geothermal system, and in severe cases, it will lead to the geothermal field losing production capacity. Content of the Utility Model
[0004] In order to solve the above technical problems, the utility model provides a geothermal tail water reinjection device, and the technical scheme adopted is as follows:
[0005] A geothermal tail water reinjection device includes an outer connecting pipe connected to one side of a geothermal pipe. The other end of the outer connecting pipe is connected to a spiral pipe installed inside a reflux tank. A one-way valve and a flow regulating valve are arranged in the outer connecting pipe between the geothermal pipe and the reflux tank; a collecting pipe is arranged at the upper end of the reflux tank, and the collecting pipe is connected to a shunt pipe installed at the upper end inside the reflux tank. A number of drain holes are opened below the shunt pipe; a reinjection pipe is connected to the lower end of the reflux tank.
[0006] Further, an opening communicating with the reflux tank is arranged at the upper end of the spiral pipe, which can mix part of the geothermal water in the geothermal pipe with the geothermal tail water in the reflux tank to increase the temperature of the geothermal tail water.
[0007] Further, a mixing plate is arranged inside the reflux tank and at the lower end of the spiral pipe. A number of openings are formed on the surface of the mixing plate, through which the geothermal tail water doped with geothermal water in the reflux tank can flow through the opening and into the reinjection pipe connected to the lower end of the reflux tank.
[0008] Further, a temperature sensor is arranged inside the reflux tank and at the lower end of the mixing plate, which can detect the temperature of the geothermal tail water after mixing with geothermal water.
[0009] Further, a filtering device for filtering impurities and waste gas in the geothermal tail water is connected to the front end of the collecting pipe to avoid blockage of the pipelines inside the reflux tank.
[0010] Compared with the prior art, the utility model has the following beneficial effects:
[0011] By installing an external connecting pipe between the geothermal pipe and the reflux tank, the utility model can convey a small part of the geothermal water inside the geothermal pipe to the inside of the reflux tank, mix it with the geothermal tail water in the reflux tank, so as to increase the temperature of the geothermal tail water; and a temperature sensor is arranged below the mixing plate in the reflux tank, which can detect the temperature of the mixed geothermal tail water, and the temperature of the mixed geothermal tail water in the reflux tank can be controlled and changed through a flow regulating valve, so that it reaches the re-injection standard, avoiding waste of heat energy caused by the low temperature of the geothermal tail water after re-injection and reducing the heat storage of the geothermal well.
[0012] The mixing plate set in the utility model can disperse the geothermal tail water doped with geothermal water while slowing down the re-injection speed, and mix it below the mixing plate, so that the geothermal water and the geothermal tail water are fully mixed, avoiding the imbalance of the heat system caused by the low temperature of the geothermal tail water and too fast re-injection speed after re-injection, and ensuring the normal production capacity of the geothermal field. Brief Description of the Drawings
[0013] Figure 1 is the overall structural schematic diagram of the utility model;
[0014] Figure 2 is the internal structural schematic diagram of the utility model;
[0015] Figure 3 is the structural schematic diagram of the shunt pipe of the utility model.
[0016] In the figure:
[0017] 1 - geothermal pipe, 2 - external connecting pipe, 21 - one-way valve, 22 - flow regulating valve, 23 - spiral pipe, 3 - reflux tank, 31 - mixing plate, 4 - manifold, 41 - shunt pipe, 42 - drain hole, 5 - re-injection pipe. Detailed Embodiment
[0018] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solutions in the embodiments of the utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model.
[0019] As shown in the Figures 1-3 drawing.
[0020] A geothermal tail water recharge device includes an external connecting pipe 2 connected to one side of a geothermal pipe 1. The other end of the external connecting pipe 2 is connected to a spiral pipe 23 installed inside a reflux tank 3, and an opening is provided at the upper end of the spiral pipe 23. A one-way valve 21 and a flow regulating valve 22 are provided in the external connecting pipe 2 between the geothermal pipe 1 and the reflux tank 3. The flow rate of the geothermal water flowing into the reflux tank 3 can be controlled by the flow regulating valve 22, and the water in the reflux tank 3 can be prevented from flowing into the geothermal pipe 1 through the one-way valve 21.
[0021] A collecting pipe 4 is provided at the upper end of the reflux tank 3. The collecting pipe 4 is connected to a shunt pipe 41 installed at the upper end inside the reflux tank 3, and a number of drainage holes 42 for the geothermal tail water to flow into the reflux tank 3 are opened below the shunt pipe 41.
[0022] Through the above structural settings, the geothermal tail water can be mixed with a part of the geothermal water from inside the geothermal pipe 1 to increase the temperature of the geothermal tail water. A temperature sensor can be set inside the lower end of the reflux tank 3 to detect the temperature of the mixed geothermal tail water, and the temperature of the mixed geothermal tail water in the reflux tank 3 can be controlled and changed through the flow regulating valve 22 to meet the recharge standard.
[0023] The above-mentioned reflux tank 3 can be installed above the ground through a support frame for the control of the flow regulating valve.
[0024] The geothermal water in the geothermal pipe 1 is discharged through the opening at the upper end of the spiral pipe 23. Before being discharged, through the structural settings of the spiral pipe 23, heat exchange can also be carried out on the water flow in the reflux tank 3 to increase the temperature of the geothermal tail water.
[0025] A mixing plate 31 is provided inside the reflux tank 3 and at the lower end of the spiral pipe 23. A number of openings are provided on the surface of the mixing plate 31, so that the geothermal tail water doped with geothermal water in the reflux tank 3 can flow through the opening into the recharge pipe 5 connected to the lower end of the reflux tank 3.
[0026] When the geothermal tail water doped with geothermal water passes through the mixing plate 31, the water flow is blocked, which will slow down the recharge speed of the geothermal tail water and avoid the rapid decrease of the underground geothermal water temperature caused by the too fast recharge of the tail water.
[0027] At the same time, under the influence of the openings in the mixing plate 31, the geothermal tail water doped with geothermal water can be dispersed here and mixed again below the mixing plate 31, enabling the geothermal water and the geothermal tail water to be fully mixed to increase the temperature of the geothermal tail water and avoid the waste of heat energy caused by the low temperature of the geothermal tail water after recharge, resulting in the reduction of the heat storage of the geothermal well.
[0028] Under the dual effects of slowing down the recharge speed and increasing the temperature of the geothermal tail water, the imbalance of the geothermal system can be avoided, ensuring the normal production capacity of the geothermal field.
[0029] Any technical solution that makes use of the technical solution described in the present utility model, or is designed by those skilled in the art inspired by the technical solution of the present utility model and achieves the above technical effects, shall fall within the protection scope of the present utility model.
Claims
1. A geothermal tailwater reinjection device, comprising an external pipe (2) connected to one side of a geothermal pipe (1), characterized in that: The other end of the external pipe (2) is connected to a spiral pipe (23) installed inside the reflux tank (3); a one-way valve (21) and a flow regulating valve (22) are provided in the external pipe (2) between the geothermal pipe (1) and the reflux tank (3); a collecting pipe (4) is provided at the upper end of the reflux tank (3); the collecting pipe (4) is connected to a branch pipe (41) installed at the upper end of the reflux tank (3); a plurality of drainage holes (42) are provided below the branch pipe (41); and a recharging pipe (5) is connected to the lower end of the reflux tank (3).
2. A geothermal tailwater reinjection device according to claim 1, characterized in that: The upper end of the spiral tube (23) is provided with an opening connected to the reflux tank (3).
3. A geothermal tailwater reinjection device according to claim 1, characterized in that: A mixing plate (31) is provided inside the reflux tank (3) and at the lower end of the spiral tube (23).
4. A geothermal tail water reinjection device as claimed in claim 3, characterized in that: A plurality of openings are provided on the surface of the mixing plate (31).
5. A geothermal tail water reinjection device as claimed in claim 3, characterized in that: A temperature sensor is provided in the reflux tank (3) and at the lower end of the mixing plate (31).