CN221005530U - Geothermal pipeline system capable of taking heat without taking water - Google Patents

Abstract

The utility model relates to a geothermal pipeline system capable of taking heat without taking water. The well head recharging device comprises a well head recharging pipe, wherein a backwater liquid inlet pipe is connected to the upper part of the well head recharging pipe, a well pipe is arranged at the lower end part of the well pipe, and a tail pipe structure is arranged at the lower part of the well pipe; a water intake pipe is arranged in a passage formed by the tail pipe structure and the well pipe, and a water pump is arranged on the water intake pipe; a second sealing piece is arranged between the water intake pipe and the tail pipe structure, the second sealing piece divides the inner cavity of the tail pipe structure into a water return cavity and a water intake cavity, a plurality of groups of water outlet through holes are formed in the peripheral wall of the water return cavity, and a plurality of groups of water inlet through holes are formed in the peripheral wall of the water intake cavity; the cleaning device is arranged in the water taking cavity; the cleaning device comprises a rotary rotating shaft arranged in the water taking cavity, a cleaning brush and a cleaning scraping plate are arranged on the rotary rotating shaft, and a rotating shaft driving assembly is further arranged. The utility model can clean the water inlet at the lower end of the pipeline system, and avoid affecting the normal operation of the pipeline system due to blockage.

Description

Geothermal pipeline system capable of taking heat without taking water

Technical Field

The utility model belongs to the technical field of geothermal facilities, and particularly relates to a geothermal pipeline system capable of taking heat without taking water.

Background

The geothermal energy is the energy stored in the earth, belongs to renewable energy sources, is higher in geothermal temperature of a lower layer positioned in a middle deep layer, and can be used for power generation, house heating and the like. Compared with energy sources such as fire coal, petroleum and the like, geothermal energy has the advantages of cleanness and repeated utilization, and belongs to renewable resources.

The deep groundwater has its own circulation system, after a part of hot water is pumped up, it can be continuously supplied from a distant place, so that the traditional geothermal utilization mode is to collect geothermal water directly, but in recent years, the ground heat is severe in various places, so that some areas are geological subsided and groundwater level is lowered, and therefore, while the good hot water is utilized, recharging is necessary, namely, the technology of 'getting heat without getting water' is adopted, namely, the heat in geothermal source water is collected and used, but the geothermal water is not collected and used. The typical mode of 'taking heat without taking water' is a recharging mode, namely, after the ground surface extracts heat energy in a geothermal water source, the used geothermal water is treated and then recharged into an aquifer again, so that the regeneration performance of the geothermal water is improved, and the aquifer is prevented from being exhausted under transitional collection.

Although the geothermal utilization mode can realize sustainable development of geothermal resources, certain defects exist, namely, as the sand content of geothermal water entering a geothermal well is relatively high, normal use of geothermal water is affected, when geothermal water is collected, a filter mechanism is required to be arranged on a downhole pipeline system, the filter mechanism can carry out filtering operation on the geothermal water, but the pipeline system is lack of a cleaning device, when the filter mechanism is blocked after long-term work, the filter mechanism cannot be cleaned, and normal collecting operation of the geothermal water is affected.

Disclosure of utility model

The utility model provides a geothermal pipeline system which is simple and reasonable in structural design and does not take heat and does not take water, aiming at solving the technical problems in the prior art. The utility model can clean the water inlet at the lower end of the pipeline system, and avoid affecting the normal operation of the pipeline system due to blockage.

The utility model adopts the technical proposal for solving the technical problems in the prior art that: the geothermal pipeline system capable of taking heat without taking water comprises a wellhead recharging pipe arranged at a wellhead, wherein the upper part of the wellhead recharging pipe is connected with a backwater liquid inlet pipe, the lower end part of the wellhead recharging pipe is provided with a well pipe, and the lower part of the well pipe is provided with a tail pipe structure positioned underground; a water intake pipe is arranged in a passage formed by the tail pipe structure and the well pipe, and a water pump is arranged on the water intake pipe; a second sealing piece is arranged between the outer peripheral wall of the water intake pipe and the inner peripheral wall of the tail pipe structure, the second sealing piece divides the inner cavity of the tail pipe structure into a water return cavity positioned above and a water intake cavity positioned below, a plurality of groups of water outlet through holes are formed in the outer peripheral wall of the water return cavity, and a plurality of groups of water inlet through holes are formed in the outer peripheral wall of the water intake cavity; the cleaning device is arranged in the water taking cavity and is used for cleaning a plurality of groups of water inlet through holes; the cleaning device comprises a rotary rotating shaft arranged in the water taking cavity, cleaning brushes and cleaning scraping plates are arranged on the rotary rotating shaft through a plurality of groups of mounting connecting rods, and a rotating shaft driving assembly for driving the rotary rotating shaft to rotate is further included.

The utility model has the advantages and positive effects that: the utility model provides a geothermal pipeline system for taking heat without taking water, which is characterized in that a tail pipe structure provided with a plurality of groups of water inlet through holes and a plurality of groups of water outlet through holes is arranged, and a water return cavity and a water taking cavity communicated with the outside can be formed at the lower part of the geothermal pipeline system by matching with a second sealing piece, so that a passage for flowing geothermal water into the pipeline system and a passage for recharging the geothermal water outside the pipeline system are formed, and simultaneously, the geothermal water flowing into a water taking cavity is filtered; the geothermal water flowing into the water taking cavity can be pumped into the water taking pipe by arranging the water taking pipe provided with the water suction pump, and pumped into the heat exchange equipment for heat collection operation under the action of the circulating pump arranged on the ground, and a passage communicated with the water returning cavity is formed by arranging the wellhead recharging pipe and the well pipe so as to finish heat collection geothermal water to flow back to the water returning cavity, and then the recharging process of the geothermal water is finished; through set up cleaning device in the water intaking cavity, can regularly clear up the operation to the inlet opening of seting up on the water intaking cavity, avoid the inlet opening to take place to block up and can't obtain the clearance and influence the normal collection operation of geothermal water after long-term work.

Preferably: the motor baffle plate is fixedly connected with the inner cavity of the driving protecting shell, the inner cavity of the driving protecting shell is enclosed into a cavity in a closed state by the motor baffle plate, the heat insulation plate is paved on the inner wall of the closed cavity, and the rotating shaft driving assembly is arranged in the closed cavity of the driving protecting shell.

Preferably: the tail pipe structure comprises a tail pipe body, a plurality of groups of water outlet through holes are formed in the upper peripheral wall of the tail pipe body and are distributed in a circumferential array manner, and a plurality of groups of water inlet through holes are formed in the lower peripheral wall of the tail pipe body and are distributed in a circumferential array manner; the upper end and the lower end of the tail pipe body are respectively provided with a flange, the upper end of the tail pipe body is in butt joint sealing connection with the water intake pipe through the flanges, and the lower end of the tail pipe body is in butt joint sealing connection with the driving protecting shell through the flanges.

Preferably: the water intake pipe comprises a plurality of groups of water intake pipe sections which are sequentially connected in a butt joint mode, flange plates are arranged at the end parts of the water intake pipe sections, and two adjacent water intake pipe sections are connected in a butt joint sealing mode through the flange plates.

Preferably: the lower end of the wellhead recharging pipe is in an open shape, the upper end of the wellhead recharging pipe is a sealing device, the upper end of the water intake pipe penetrates through the wellhead recharging pipe in a sealing mode, and the backwater liquid inlet pipe is arranged on the peripheral wall of the wellhead recharging pipe and is communicated with the inner cavity of the wellhead recharging pipe; the water collecting elbow is arranged at the upper end part of the water collecting pipe.

Preferably: the water inlets of the water suction pump and the water intake pipe are positioned in the water intake chamber.

Preferably: a first sealing piece is arranged between the outer peripheral wall of the tail pipe structure and the well wall, and the first sealing piece is positioned between the water inlet through hole and the water outlet through hole and above the second sealing piece.

Drawings

FIG. 1 is a schematic view of the present utility model in front cross-section;

fig. 2 is a schematic perspective view of a tail pipe structure in the present utility model.

In the figure: 1. installing a connecting rod; 2. rotating the rotating shaft; 3. a motor separator; 4. a speed reducing motor; 5. a heat insulating plate; 6. driving the protective shell; 7. cleaning brushes; 8. a water pump; 9. a tail pipe structure; 9-1, a tail pipe body; 9-2, a water inlet through hole; 9-3, water outlet through holes; 10. a well pipe; 11. a water intake pipe; 12. a wellhead recharging pipe; 13. a water collection bent pipe; 14. a backwater liquid inlet pipe; 15. a concrete layer; 16. a backwater chamber; 17. a first seal; 18. a second seal; 19. a water intake chamber; 20. cleaning the scraping plate.

Detailed Description

For a further understanding of the utility model, its features and advantages, the following examples are set forth in detail:

Referring to fig. 1, the geothermal pipeline system for taking heat without water according to the present utility model includes a wellhead recharging pipe 12 disposed at a wellhead, a water inlet of the wellhead recharging pipe 12 extends above the ground and is connected to a circulation pump through a liquid pipeline, and the circulation pump is used for recharging geothermal water after heat extraction into a geothermal well. Further, the water inlet is formed on the outer peripheral wall of the upper part of the wellhead recharging pipe 12 and is connected with a backwater liquid inlet pipe 14, and the backwater liquid inlet pipe 14 is communicated with the inner cavity of the wellhead recharging pipe 12. The top of the wellhead recharging pipe 12 is closed, the lower end of the wellhead recharging pipe is open, and the well pipe 10 is installed in a butt joint mode at the open position. The specific manner in which the well casing 10 and wellhead recharging pipe 12 are connected is prior art and will not be described in detail herein.

To install the wellhead recharge pipe 12 and well tubular 10 and to consolidate the geothermal well, the upper half of the geothermal well is filled with a concrete layer 15. The wellhead recharge tube 12 and the upper portion of the well tubular 10 are located at a concrete layer 15.

As shown in fig. 1, in order to facilitate the geothermal pipe system to perform water intake and recharging operations in the well, a tail pipe structure 9 located in the well is installed at the lower part of a well pipe 10, a water intake pipe 11 is disposed in a passage formed by the tail pipe structure 9 and the well pipe 10, a water suction pump 8 is installed on the water intake pipe 11, the water intake pipe 11 is fixedly connected with the water suction pump 8 for extracting geothermal water in the geothermal well, the upper end part of the water intake pipe 11 penetrates through a wellhead recharging pipe 12 in a sealing manner, in this embodiment, the water intake pipe 11 comprises a plurality of groups of water intake pipe sections which are installed in a butt joint manner in sequence, flanges are disposed at the end parts of the respective water intake pipe sections, and two adjacent water intake pipe sections are connected in a butt joint sealing manner through the flanges.

The upper end of the water intake pipe 11 extends to the upper part of the ground, and a water collection elbow 13 is arranged at the water outlet of the upper end of the water intake pipe 11 for conveniently installing a liquid pipeline. The water collection bent pipe 13 is connected with a heat exchanger (not shown) through a liquid pipeline, and the heat exchanger is connected with a circulating pump through a liquid pipeline so as to realize heat extraction in geothermal water and recharging of geothermal water.

As shown in fig. 1, the inner wall of the wellhead recharging pipe 12 and the inner wall of the well pipe 10 both cooperate with the outer peripheral wall of the water intake pipe 11 to form a recharging passage through which the recharged geothermal water flows.

Referring further to fig. 2, in the present embodiment, the tailpipe structure 9 includes a tailpipe body 9-1, a flange is mounted at an upper end portion of the tailpipe body 9-1, and an upper end portion of the tailpipe body 9-1 is butt-sealed with the water intake pipe 11 through the flange. A second seal 18 is provided between the lower part of the outer peripheral wall of the water intake pipe 11 and the inner peripheral wall of the liner structure 9, and the second seal 18 divides the inner space formed by the liner structure 9 and the water intake pipe 11 into an upper water return chamber 16 and a lower water intake chamber 19. Wherein the return water chamber 16 communicates with the recharging passageway described above. The tail pipe structure 9 further comprises a plurality of groups of water outlet through holes 9-3 formed in the peripheral wall of the backwater cavity 16, and further, the plurality of groups of water outlet through holes 9-3 are formed in the upper peripheral wall of the tail pipe body 9-1 and are distributed in a circumferential array. Through the arrangement, the geothermal water after heat extraction flows downwards along the recharging passage by the convenient circulating pump, and then is reinjected above the water taking layer through the plurality of groups of water outlet through holes 9-3.

As shown in fig. 1 and 2, the tail pipe structure 9 further includes a plurality of groups of water inlet through holes 9-2 formed in the outer peripheral wall of the water intake chamber 19, and the plurality of groups of water inlet through holes 9-2 are formed in the lower peripheral wall of the tail pipe body 9-1 and are arranged in a circumferential array. Wherein the water intake of the water pump 8 and the water intake pipe 11 is located in the water intake chamber 19.

By arranging a plurality of groups of water inlet through holes 9-2, geothermal water in the water-containing layer can conveniently flow into a geothermal pipeline system, and meanwhile, geothermal water can be filtered, so that the diameter of the water inlet through holes 9-2 is smaller than the average granularity of sand grains in geothermal water for realizing the filtering operation.

A first sealing member 17 is provided between the outer peripheral wall of the liner structure 9 and the well wall, the first sealing member 17 being located between the water inlet through hole 9-2 and the water outlet through hole 9-3 and above the second sealing member 18. By the arrangement, the mixing of the recharging water and the geothermal water can be avoided, so that the extracted geothermal water can keep a higher temperature.

As shown in fig. 1, in order to avoid that sand particles in geothermal water block the water inlet hole 9-2 of the tail pipe structure 9 and cannot be cleaned after long-time operation, the embodiment further includes a cleaning device disposed in the water intake chamber 19 for cleaning the plurality of groups of water inlet holes 9-2.

As shown in fig. 1, the cleaning device comprises a rotary shaft 2 arranged in a water taking cavity 19, a cleaning brush 7 and a cleaning scraper 20 are arranged on the rotary shaft 2 through a plurality of groups of mounting connecting rods 1, and a rotary shaft driving assembly for driving the rotary shaft 2 to rotate is further included.

In order to ensure that the rotary shaft driving assembly can be installed in a dry sealed space, the embodiment further comprises a driving protecting shell 6 connected with the lower end part of the tail pipe structure 9, and flange plates are installed at the lower end parts of the tail pipe body 9-1 for convenient installation, and the lower end part of the tail pipe body 9-1 is in butt joint sealing connection with the driving protecting shell 6 through the flange plates. The inner cavity of the driving protective shell 6 is fixedly connected with a transversely arranged motor partition plate 3, the motor partition plate 3 encloses the inner cavity of the driving protective shell 6 into a cavity in a closed state, the heat insulation plate 5 is paved on the inner wall of the closed cavity, and the rotating shaft driving assembly is arranged in the closed cavity of the driving protective shell 6. Through setting up heat insulating board 5, can play thermal-insulated operation, avoid pivot drive assembly to take place to damage because of the high temperature. The rotary shaft 2 penetrates through the motor partition plate 3 in a sealing manner and is rotationally connected with the motor partition plate 3, the rotary shaft driving assembly comprises a motor seat arranged on the inner side surface of the motor partition plate 3, a gear motor 4 is fixedly connected to the motor seat, and an output shaft of the gear motor 4 is connected with the rotary shaft 2 through a coupler.

Working principle:

The geothermal water enters a water taking cavity 19 of the tail pipe structure 9 through a plurality of groups of water inlet holes 9-2 on the tail pipe structure 9, as the water inlets of the water taking pump 8 and the water taking pipe 11 are positioned in the water taking cavity 19, the geothermal water in the water taking cavity 19 can be pumped into the water taking pipe 11 by the water taking pump 8, and flows into heat exchange equipment arranged on the ground under the action of a water collecting bent pipe 13, a liquid pipeline and a circulating pump, the heat exchange equipment collects the heat in the geothermal water for subsequent utilization, then the circulating pump pumps the geothermal water with the heat collection into a water return inlet pipe 14, flows into a recharging passage formed by the combined action of the inner wall of a wellhead recharging pipe 12, the inner wall of a well pipe 10 and the outer peripheral wall of the water taking pipe 11 through the water return inlet pipe 14, flows into a water returning cavity 16 through the recharging passage, and is refilled above the water taking layer through a plurality of groups of water outlet holes 9-3 formed on the inner wall of the water returning cavity 16, so that the heat collection and recharging process of the geothermal water is realized;

At intervals, the gear motor 4 is started, the started gear motor 4 drives the rotary shaft 2 to rotate, the rotary shaft 2 can drive the cleaning brush 7 and the cleaning scraping plate 20 which are arranged on the rotary shaft to revolve around the central line, and then the inner wall of the lower end of the tail pipe body 9-1 is cleaned, the cleaning operation is carried out on a plurality of groups of water inlet through holes 9-2 positioned on the inner wall of the lower end of the tail pipe body 9-1, and the normal operation of a geothermal pipeline system is prevented from being influenced by the blockage of the water inlet through holes 9-2. In the actual working process, the operation interval time of the cleaning device is not suitable to be too long or too short, the interval time is too long, so that a plurality of groups of water inlet through holes 9-2 are easily blocked in a large area, the normal operation of the geothermal pipeline system is influenced, and the operation efficiency of the geothermal pipeline system is easily influenced when the interval time is too short, so that the cleaning device needs to be set according to the condition that sand particles in the geothermal water in the working process are blocked in the water inlet through holes 9-2.

Claims (7)

1. A geothermal pipe system for taking heat without taking water, which is characterized in that: the well head recharging device comprises a well head recharging pipe (12) arranged at a well head, wherein a backwater liquid inlet pipe (14) is connected to the upper part of the well head recharging pipe (12), a well pipe (10) is arranged at the lower end part of the well pipe (10), and a tail pipe structure (9) positioned underground is arranged at the lower part of the well pipe (10); a water intake pipe (11) is arranged in a passage formed by the tail pipe structure (9) and the well pipe (10), and a water pump (8) is arranged on the water intake pipe (11); a second sealing piece (18) is arranged between the outer peripheral wall of the water intake pipe (11) and the inner peripheral wall of the tail pipe structure (9), the second sealing piece (18) divides the inner cavity of the tail pipe structure (9) into a water return cavity (16) positioned above and a water intake cavity (19) positioned below, a plurality of groups of water outlet through holes (9-3) are formed in the outer peripheral wall of the water return cavity (16), and a plurality of groups of water inlet through holes (9-2) are formed in the outer peripheral wall of the water intake cavity (19); the device also comprises a cleaning device arranged in the water taking cavity (19) and used for cleaning a plurality of groups of water inlet through holes (9-2); the cleaning device comprises a rotary shaft (2) arranged in a water taking cavity (19), a cleaning brush (7) and a cleaning scraper (20) are arranged on the rotary shaft (2) through a plurality of groups of mounting connecting rods (1), and a rotary shaft driving assembly for driving the rotary shaft (2) to rotate is further included.

2. The geothermal piping system of claim 1, wherein the geothermal piping system is configured to heat the geothermal piping system without taking water, wherein: the motor baffle plate (3) is fixedly connected with the inner cavity of the driving protecting shell (6), the inner cavity of the driving protecting shell (6) is surrounded to form a cavity in a closed state by the motor baffle plate (3), the heat insulation plate (5) is paved on the inner wall of the closed cavity, and the rotating shaft driving assembly is arranged in the closed cavity of the driving protecting shell (6).

3. The geothermal piping system for taking heat without taking water as defined in claim 2, wherein: the tail pipe structure (9) comprises a tail pipe body (9-1), a plurality of groups of water outlet through holes (9-3) are formed in the upper peripheral wall of the tail pipe body (9-1) and are distributed in a circumferential array manner, and a plurality of groups of water inlet through holes (9-2) are formed in the lower peripheral wall of the tail pipe body (9-1) and are distributed in a circumferential array manner; the upper end part and the lower end part of the tail pipe body (9-1) are respectively provided with a flange, the upper end part of the tail pipe body (9-1) is in butt sealing connection with the water intake pipe (11) through the flanges, and the lower end part of the tail pipe body (9-1) is in butt sealing connection with the driving protective shell (6) through the flanges.

4. The geothermal piping system of claim 1, wherein the geothermal piping system is configured to heat the geothermal piping system without taking water, wherein: the water intake pipe (11) comprises a plurality of groups of water inlet pipe sections which are sequentially connected in a butt joint mode, flange plates are arranged at the end portions of the water inlet pipe sections, and two adjacent water inlet pipe sections are connected in a butt joint sealing mode through the flange plates.

5. The geothermal piping system of claim 1, wherein the geothermal piping system is configured to heat the geothermal piping system without taking water, wherein: the lower end of the wellhead recharging pipe (12) is open, the upper end of the wellhead recharging pipe is a sealing device, the upper end of the water intake pipe (11) penetrates through the wellhead recharging pipe (12) in a sealing mode, and the water return liquid inlet pipe (14) is arranged on the peripheral wall of the wellhead recharging pipe (12) and is communicated with the inner cavity of the wellhead recharging pipe (12); the water collecting elbow pipe (13) is arranged at the upper end part of the water collecting pipe (11).

6. The geothermal piping system of claim 1, wherein the geothermal piping system is configured to heat the geothermal piping system without taking water, wherein: the water inlets of the water suction pump (8) and the water intake pipe (11) are positioned in the water intake cavity (19).

7. The geothermal piping system of claim 1, wherein the geothermal piping system is configured to heat the geothermal piping system without taking water, wherein: a first sealing piece (17) is arranged between the outer peripheral wall of the tail pipe structure (9) and the well wall, and the first sealing piece (17) is positioned between the water inlet through hole (9-2) and the water outlet through hole (9-3) and above the second sealing piece (18).