CN212902073U

CN212902073U - Geothermal utilization system based on underground continuous wall

Info

Publication number: CN212902073U
Application number: CN202021858807.6U
Authority: CN
Inventors: 胡敏云; 符东; 王捷; 张勇
Original assignee: Zhejiang University of Technology ZJUT
Current assignee: Zhejiang University of Technology ZJUT
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-04-06
Anticipated expiration: 2030-08-31

Abstract

A geothermal utilization system based on underground continuous walls comprises a water inlet pipe arranged on a first underground continuous wall and a third water outlet pipe arranged on a second underground continuous wall; the underground water layer is communicated with the water inlet end of the high-pressure water pump through a water inlet pipe, and the water outlet end of the high-pressure water pump is connected with the water inlet end of the first electric shunt valve; two water outlet ends of the first electric shunt valve are respectively connected with a second connecting pipe and a fourth connecting pipe, and a first grid type heat exchanger is arranged on the fourth connecting pipe; the water outlet end of the second connecting pipe is connected with the water inlet end of the first high-pressure heat energy conversion machine, the water outlet end of the first high-pressure heat energy conversion machine is connected with the water inlet end of the second electric shunting valve through a pipeline, the two water outlet ends of the second electric shunting valve are respectively connected with the third connecting pipe and the fifth connecting pipe, and the fifth connecting pipe is provided with a second grid type heat exchanger. The utility model has the advantages of large energy, easy utilization and the like, and reasonably utilizes geothermal resource energy to bring benefits to economy and environment.

Description

Geothermal utilization system based on underground continuous wall

Technical Field

The utility model relates to a geothermal utilization technical field especially relates to a geothermal utilization system based on underground continuous wall.

Background

With the development of foundation pit engineering, more and more foundation pits are biased to develop in deep, large and poor geological areas, and most of foundation pit enclosure structures of the foundation pits are made of reinforced concrete underground continuous walls. The underground continuous wall is used as a building enclosure of a foundation pit, and has the main advantages of good integrity, high rigidity, good impermeability and the like. The underground continuous wall enclosure structure of some deep and large foundation pits has deep soil body inserting depth, large cross section area and high cost, and only has lower utilization rate as an underground permanent enclosure structure. The geothermal energy is a novel renewable energy source, is mainly stored below a shallow earth surface, has wide distribution range and large energy, has much higher economic benefit than coal, petroleum and other non-renewable energy sources if being reasonably developed and utilized, and has smaller influence on the environment. The underground diaphragm wall and the geothermal energy are reasonably combined, so that the problem of low utilization rate of the underground diaphragm wall can be solved, and the environment can be better protected.

Disclosure of Invention

In order to overcome the problems, the utility model provides a terrestrial heat utilization system based on underground continuous wall and its utilization method with enclosure and terrestrial heat utilization dual function.

The utility model adopts the technical proposal that: a geothermal utilization system based on underground continuous walls comprises a first underground continuous wall and a second underground continuous wall which are adjacent, wherein underground water layers are arranged at the bottoms of the first underground continuous wall and the second underground continuous wall; a water inlet pipe vertically penetrating through the first underground continuous wall is arranged on the first underground continuous wall; a third water outlet pipe vertically penetrating through the second underground continuous wall is arranged on the second underground continuous wall;

the underground water layer is communicated with the water inlet end of the high-pressure water pump through a water inlet pipe, the high-pressure water pump is positioned above the first underground continuous wall, and the water outlet end of the high-pressure water pump is connected with the water inlet end of the first electric shunt valve through a first connecting pipe; the first electric shunt valve is provided with two water outlet ends, the two water outlet ends of the first electric shunt valve are respectively connected with the second connecting pipe and the fourth connecting pipe, and the fourth connecting pipe is positioned at the rear side of the first underground continuous wall; the fourth connecting pipe is a U-shaped bent pipe, and two pipe orifices of the fourth connecting pipe are vertically arranged along the vertical direction; the fourth connecting pipe is provided with a first grid heat exchanger, and the outer surface of the fourth connecting pipe is coated with a first heat preservation layer; the water outlet end of the fourth connecting pipe extends into the first underground continuous wall and is connected with the water inlet end of the first water outlet pipe, the first water outlet pipe is buried in the first underground continuous wall, and the water outlet end of the first water outlet pipe is communicated with the underground water layer;

the second connecting pipe is a reducing pipe, the water outlet end of the second connecting pipe is connected with the water inlet end of the first high-pressure heat energy conversion machine, the water outlet end of the first high-pressure heat energy conversion machine is connected with the water inlet end of the second electric shunting valve through a pipeline, the second electric shunting valve is provided with two water outlet ends, the two water outlet ends of the second electric shunting valve are respectively connected with the third connecting pipe and the fifth connecting pipe, and the fifth connecting pipe is positioned on the rear side of the second underground continuous wall; the fifth connecting pipe is a U-shaped bent pipe, and two pipe orifices of the fifth connecting pipe are vertically arranged along the vertical direction; a second grid type heat exchanger is arranged on the fifth connecting pipe, and a second heat-insulating layer is coated on the outer surface of the fifth connecting pipe; the water outlet end of the fifth connecting pipe extends into the second underground continuous wall and is connected with the water inlet end of the second water outlet pipe, the second water outlet pipe is buried in the second underground continuous wall, and the water outlet end of the second water outlet pipe is communicated with the underground water layer;

the water outlet end of the third connecting pipe is connected with the water inlet end of the second high-pressure heat energy conversion machine, the water outlet end of the second high-pressure heat energy conversion machine is connected with the third water outlet pipe, and the water outlet end of the third water outlet pipe is communicated with the underground water layer;

the water inlet pipe is also provided with a first temperature sensor which is positioned at one end of the water inlet pipe close to the underground water layer; a first flow sensor is arranged on the first connecting pipe; a second temperature sensor is arranged on a pipeline between the first high-pressure heat energy converter and the second electric shunt valve; a second flow sensor is arranged on the first water outlet pipe, a third flow sensor is arranged on the second water outlet pipe, and a fourth flow sensor is arranged on the third water outlet pipe;

the first temperature sensor, the second temperature sensor, the first flow sensor, the second flow sensor, the third flow sensor, the fourth flow sensor, the first electric shunt valve, the second electric shunt valve, the first high-pressure heat energy converter, the second high-pressure heat energy converter and the high-pressure water pump are respectively electrically connected with the integrated controller; the integrated controller controls the actions of the first electric shunt valve, the second electric shunt valve, the first high-pressure heat energy converter, the second high-pressure heat energy converter and the high-pressure water pump according to the collected water temperature and flow information.

Furthermore, the diameter of the second connecting pipe is gradually reduced from the end close to the first electric shunt valve to the end far away from the first electric shunt valve, so that the water flow pressure at the water outlet end of the second connecting pipe is greater than the water flow pressure at the water inlet end of the second connecting pipe.

Furthermore, two first reserved holes used for installing the water inlet pipe and the first water outlet pipe respectively are formed in the first underground continuous wall, and two second reserved holes used for installing the second water outlet pipe and the third water outlet pipe respectively are formed in the second underground continuous wall.

The utility model has the advantages that:

(1) as a geothermal utilization system based on the underground continuous wall, the underground continuous wall is additionally provided with a plurality of devices through pipelines, so that the underground continuous wall serving as a foundation pit enclosure structure does not influence the strength, the rigidity, the water permeability and other important characteristics of the foundation pit enclosure structure.

(2) As a geothermal utilization system based on underground continuous walls, part of pipelines are arranged inside the underground continuous walls, so that the system is convenient to construct and cannot occupy other spaces, and the space utilization is maximized.

(3) The underground continuous wall is a foundation pit enclosure structure with the highest manufacturing cost at present, and meanwhile, the underground continuous wall is reasonably utilized as a permanent enclosure structure on the premise of not influencing some important characteristics of the underground continuous wall, so that the underground continuous wall can obtain the maximum economy.

(4) Geothermal resources are used as a novel renewable energy source, have the advantages of wide range, large energy, easy utilization and the like, and reasonably utilize the geothermal resources to bring great benefits to economy and environment.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a plan view of the present invention.

Fig. 3 is a side view of the present invention.

Fig. 4 is a front view of a first cascade plate.

Fig. 5 is a schematic view of the simple water flow path of the present invention.

Fig. 6 is a logic control schematic diagram of the present invention.

Description of reference numerals: 1a, a first underground continuous wall; 1b, a second underground continuous wall; 2. a groundwater layer; 3. a water inlet pipe; 4. a first water outlet pipe; 5. a second water outlet pipe; 6. a third water outlet pipe; 7. a first connecting pipe; 8. a second connecting pipe; 9. a third connecting pipe; 10. a high pressure water pump; 11. a first electrically operated shunt valve; 12. a second electrically operated shunt valve; 13. a first high pressure heat energy converter; 14. a second high pressure heat energy converter; 15. a first temperature sensor; 16. A second temperature sensor; 17. a first flow sensor; 18. a second flow sensor; 19. A third flow sensor; 20. a fourth flow sensor; 21. a fourth connecting pipe, 22 and a fifth connecting pipe; 23. a first grid heat exchanger; 24. a second grid heat exchanger; 25. a first insulating layer.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to the attached drawings, the geothermal utilization system based on the underground continuous wall comprises a first underground continuous wall 1a and a second underground continuous wall 1b which are adjacent, wherein the bottoms of the first underground continuous wall 1a and the second underground continuous wall 1b are provided with underground water layers; two first reserved holes of 12 centimeters are formed in the first underground continuous wall 1a, and two second reserved holes of 12 centimeters are formed in the second underground continuous wall 1 b; a water inlet pipe 3 and a first water outlet pipe 4 are respectively arranged in the two first reserved holes; a second water outlet pipe 5 and a third water outlet pipe 6 are respectively arranged in the two second reserved holes;

the underground water layer 2 is communicated with a water inlet end of a high-pressure water pump 10 through a water inlet pipe 3, the high-pressure water pump 10 is positioned above the first underground continuous wall 1a, and a water outlet end of the high-pressure water pump 10 is connected with a water inlet end of a first electric shunt valve 11 through a first connecting pipe 7; the first electric shunt valve 11 is provided with two water outlet ends, the two water outlet ends of the first electric shunt valve 11 are respectively connected with the second connecting pipe 8 and the fourth connecting pipe 21, and the fourth connecting pipe 21 is positioned at the rear side of the first underground continuous wall 1 a; the fourth connecting pipe 21 is a U-shaped bent pipe, and two pipe orifices of the fourth connecting pipe 21 are arranged up and down along the vertical direction; the fourth connecting pipe 21 is provided with a first grid heat exchanger 23, and the outer surface of the fourth connecting pipe 21 is coated with a first heat preservation layer 25; the water outlet end of the fourth connecting pipe 21 extends into the first underground continuous wall 1a and is connected with the water inlet end of the first water outlet pipe 4, the first water outlet pipe 4 is buried in the first underground continuous wall 1a, and the water outlet end of the first water outlet pipe 4 is communicated with the underground water layer 2;

the second connecting pipe 8 is a reducing pipe, the diameter of the second connecting pipe is larger and about 12 cm close to the first electric split-flow valve, the diameter of the second connecting pipe is smaller and about 8 cm close to the first high-pressure heat energy converter, the diameter changes to be linear gradual change, and the pipe diameter of the second connecting pipe is gradually reduced to play a role in simple pressurization; the water outlet end of the second connecting pipe 8 is connected with the water inlet end of the first high-pressure heat energy converter 13, the water outlet end of the first high-pressure heat energy converter 13 is connected with the water inlet end of the second electric shunt valve 12 through a pipeline, the second electric shunt valve 12 is provided with two water outlet ends, the two water outlet ends of the second electric shunt valve 12 are respectively connected with the third connecting pipe 9 and the fifth connecting pipe 22, and the fifth connecting pipe 22 is positioned at the rear side of the second underground continuous wall 1 b; the fifth connecting pipe 22 is a U-shaped bent pipe, and two pipe orifices of the fifth connecting pipe 22 are arranged up and down along the vertical direction; a second grid heat exchanger 24 is arranged on the fifth connecting pipe 22, and a second insulating layer is coated on the outer surface of the fifth connecting pipe 22; the water outlet end of the fifth connecting pipe 22 extends into the second underground continuous wall 1b to be connected with the water inlet end of the second water outlet pipe 5, the second water outlet pipe 5 is buried in the second underground continuous wall 1b, and the water outlet end of the second water outlet pipe 5 is communicated with the underground water layer 2;

the water outlet end of the third connecting pipe 9 is connected with the water inlet end of the second high-pressure heat energy conversion machine 14, the water outlet end of the second high-pressure heat energy conversion machine 14 is connected with the third water outlet pipe 6, and the water outlet end of the third water outlet pipe 6 is communicated with the underground water layer 2;

the water inlet pipe 3 is also provided with a first temperature sensor 15, and the first temperature sensor 15 is positioned at one end of the water inlet pipe 3 close to the groundwater layer; a first flow sensor 17 is arranged on the first connecting pipe 7; a second temperature sensor 16 is arranged on a pipeline between the first high-pressure heat energy converter 13 and the second electric shunt valve 12; a second flow sensor 18 is arranged on the first water outlet pipe 4, a third flow sensor 19 is arranged on the second water outlet pipe 5, and a fourth flow sensor 20 is arranged on the third water outlet pipe 6;

the first temperature sensor 15, the second temperature sensor 16, the first flow sensor 17, the second flow sensor 18, the third flow sensor 19, the fourth flow sensor 20, the first electric shunt valve 11, the second electric shunt valve 12, the first high-pressure heat energy converter 13, the second high-pressure heat energy converter 14 and the high-pressure water pump 10 are respectively electrically connected with the integrated controller; the integrated controller controls the actions of the first electric shunt valve 11, the second electric shunt valve 12, the first high-pressure heat energy converter 13, the second high-pressure heat energy converter 14 and the high-pressure water pump 10 according to the collected water temperature and flow information.

A control method of a geothermal utilization system based on underground continuous walls comprises the following steps:

step 1, a first temperature sensor transmits temperature data of water in an underground water layer to an integrated controller, the integrated controller compares the temperature data with a preset minimum utilization temperature, if the temperature data is lower than the preset minimum utilization temperature, the energy contained in the integrated controller is lower, the utilization cost is higher, the economical efficiency is poorer, and a geothermal utilization system is not started; otherwise, executing the step 2;

step 2, the integrated controller transmits a command to the high-pressure water pump, and the high-pressure water pump is started to pump water; when water flows through the first flow sensor, the first flow sensor measures the flow of the flowing water and transmits data to the integrated controller, the integrated controller compares the flow with the preset minimum utilization flow, if the flow is lower than the preset minimum utilization flow, the integrated controller transmits a command to the first electric shunt valve, the first electric shunt valve opens an outlet leading to the direction of the fourth connecting pipe and closes an outlet leading to the direction of the second connecting pipe, the water flow enters the first grid type heat exchanger for heat exchange, and flows out of the first water outlet pipe after the heat exchange is completed; otherwise, executing the step 3;

step 3, the integrated controller transmits commands to a first electric shunt valve and a first high-pressure heat energy converter, and the first electric shunt valve opens an outlet leading to the direction of the second connecting pipe and closes an outlet leading to the direction of the fourth connecting pipe; the first high-pressure heat energy conversion machine is started, water flows through the second connecting pipe to be secondarily pressurized and enters the first high-pressure heat energy conversion machine to generate electricity, the water flows are utilized by the first high-pressure heat energy conversion machine, then pass through the second temperature sensor and transmit temperature data to the integrated controller through the second temperature sensor, the integrated controller compares the temperature data with the preset lowest secondary utilization temperature, if the temperature data is lower than the lowest secondary utilization temperature, the second electric shunt valve is started to lead to an outlet in the direction of the fifth connecting pipe and the outlet in the direction of the third connecting pipe is closed, the water flows enter the second grid type heat exchanger to perform heat exchange action, and the water flows out through the second water outlet pipe after the heat exchange action is completed; otherwise, executing the step 4;

step 4, the integrated controller controls to transmit commands to a second electric shunt valve and a second high-pressure heat energy converter, and the second electric shunt valve opens an outlet leading to the direction of the third connecting pipe and closes an outlet leading to the direction of the second water outlet pipe; the second high-pressure heat energy conversion machine is started to carry out secondary power generation and utilization, the secondary utilization temperature is lower than the primary utilization temperature, generally, after the underground hot water is utilized twice, the energy contained in the temperature is greatly reduced, and the underground hot water does not need to be utilized for three times or more, and after the water flows through the second high-pressure heat energy conversion machine for utilization, the water flows to an underground water layer through a third water outlet pipe;

and 5, transmitting the recorded data to the integrated controller by the second flow sensor, the third flow sensor and the fourth flow sensor, and calculating the heat energy and the power generation utilization rate by the integrated controller.

The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather the scope of the invention is intended to include equivalent technical means as would be understood by those skilled in the art from the inventive concepts.

Claims

1. A geothermal utilization system based on underground continuous walls comprises a first underground continuous wall (1a) and a second underground continuous wall (1b) which are adjacent, wherein the bottoms of the first underground continuous wall (1a) and the second underground continuous wall (1b) are provided with a groundwater layer (2); the method is characterized in that: a water inlet pipe (3) vertically penetrating through the first underground continuous wall (1a) is arranged on the first underground continuous wall (1 a); a third water outlet pipe (6) vertically penetrating through the second underground continuous wall (1b) is arranged on the second underground continuous wall (1 b);

the underground water layer (2) is communicated with the water inlet end of a high-pressure water pump (10) through a water inlet pipe (3), the high-pressure water pump (10) is positioned above the first underground continuous wall (1a), and the water outlet end of the high-pressure water pump (10) is connected with the water inlet end of a first electric shunt valve (11) through a first connecting pipe (7); the first electric shunt valve (11) is provided with two water outlet ends, the two water outlet ends of the first electric shunt valve (11) are respectively connected with the second connecting pipe (8) and the fourth connecting pipe (21), and the fourth connecting pipe (21) is positioned at the rear side of the first underground continuous wall (1 a); the fourth connecting pipe (21) is a U-shaped bent pipe, and two pipe orifices of the fourth connecting pipe (21) are vertically arranged along the vertical direction; a first grid type heat exchanger (23) is arranged on the fourth connecting pipe (21), and a first heat preservation layer (25) is coated on the outer surface of the fourth connecting pipe (21); the water outlet end of the fourth connecting pipe (21) extends into the first underground continuous wall (1a) and is connected with the water inlet end of the first water outlet pipe (4), the first water outlet pipe (4) is embedded in the first underground continuous wall (1a), and the water outlet end of the first water outlet pipe (4) is communicated with the underground water layer (2);

the second connecting pipe (8) is a reducing pipe, the water outlet end of the second connecting pipe (8) is connected with the water inlet end of the first high-pressure heat energy converter (13), the water outlet end of the first high-pressure heat energy converter (13) is connected with the water inlet end of the second electric shunting valve (12) through a pipeline, the second electric shunting valve (12) is provided with two water outlet ends, the two water outlet ends of the second electric shunting valve (12) are respectively connected with the third connecting pipe (9) and the fifth connecting pipe (22), and the fifth connecting pipe (22) is positioned on the rear side of the second underground continuous wall (1 b); the fifth connecting pipe (22) is a U-shaped bent pipe, and two pipe orifices of the fifth connecting pipe (22) are vertically arranged along the vertical direction; a second grid type heat exchanger (24) is arranged on the fifth connecting pipe (22), and a second insulating layer is coated on the outer surface of the fifth connecting pipe (22); the water outlet end of the fifth connecting pipe (22) extends into the second underground continuous wall (1b) and is connected with the water inlet end of the second water outlet pipe (5), the second water outlet pipe (5) is buried in the second underground continuous wall (1b), and the water outlet end of the second water outlet pipe (5) is communicated with the underground water layer (2);

the water outlet end of the third connecting pipe (9) is connected with the water inlet end of the second high-pressure heat energy conversion machine (14), the water outlet end of the second high-pressure heat energy conversion machine (14) is connected with the third water outlet pipe (6), and the water outlet end of the third water outlet pipe (6) is communicated with the underground water layer (2);

the water inlet pipe (3) is also provided with a first temperature sensor (15), and the first temperature sensor (15) is positioned at one end of the water inlet pipe (3) close to the underground water layer; a first flow sensor (17) is arranged on the first connecting pipe (7); a second temperature sensor (16) is arranged on a pipeline between the first high-pressure heat energy converter (13) and the second electric shunt valve (12); a second flow sensor (18) is arranged on the first water outlet pipe (4), a third flow sensor (19) is arranged on the second water outlet pipe (5), and a fourth flow sensor (20) is arranged on the third water outlet pipe (6);

the first temperature sensor (15), the second temperature sensor (16), the first flow sensor (17), the second flow sensor (18), the third flow sensor (19), the fourth flow sensor (20), the first electric shunt valve (11), the second electric shunt valve (12), the first high-pressure heat energy converter (13), the second high-pressure heat energy converter (14) and the high-pressure water pump (10) are respectively electrically connected with the integrated controller; the integrated controller controls the actions of the first electric shunt valve (11), the second electric shunt valve (12), the first high-pressure heat energy converter (13), the second high-pressure heat energy converter (14) and the high-pressure water pump (10) according to the collected water temperature and flow information.

2. The underground continuous wall-based geothermal utilization system of claim 1, wherein: the diameter of the second connecting pipe (8) is gradually reduced from one end close to the first electric shunt valve (11) to one end far away from the first electric shunt valve (11), so that the water flow pressure of the water outlet end of the second connecting pipe (8) is greater than that of the water inlet end of the second connecting pipe (8).

3. The underground continuous wall-based geothermal utilization system of claim 1, wherein: the first underground continuous wall (1a) is provided with two first reserved holes for mounting the water inlet pipe (3) and the first water outlet pipe (4) respectively, and the second underground continuous wall (1b) is provided with two second reserved holes for mounting the second water outlet pipe (5) and the third water outlet pipe (6) respectively.