CN115823757A - Multi-pipe backflow type single-well heat taking and water non-taking heat supply system for middle-deep layer geothermal energy - Google Patents
Multi-pipe backflow type single-well heat taking and water non-taking heat supply system for middle-deep layer geothermal energy Download PDFInfo
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- CN115823757A CN115823757A CN202211187018.8A CN202211187018A CN115823757A CN 115823757 A CN115823757 A CN 115823757A CN 202211187018 A CN202211187018 A CN 202211187018A CN 115823757 A CN115823757 A CN 115823757A
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Abstract
The invention relates to a multi-pipe reflux type middle-deep geothermal energy single-well heat-taking and water-non-taking heat supply system.A downhole heat exchanger is arranged in a geothermal well, the upper part of the downhole heat exchanger is connected with a heat supply and water-returning pipe, the lower part of the downhole heat exchanger is connected with a geothermal circulating water pipe, the geothermal circulating water pipe is inserted into an underground water-taking layer, a pump chamber is arranged in the geothermal circulating water pipe, a reflux pipe group consisting of a plurality of unit pipe bundles is coaxially arranged around the upper part of the lower water-taking layer of the geothermal circulating water pipe, and the reflux pipe group is arranged on the geothermal circulating water pipe through a fixed water baffle. The invention innovatively discloses a backflow pipe group, a water retaining sealing plate, a built-in pump chamber and an underground heat exchanger structure, and in the heat taking process, geothermal water does not flow out of a well mouth completely, so that 'heat taking without water taking' is realized in a real sense, the power consumption of the submersible pump is greatly reduced while heat exchange and heat taking are realized efficiently, and the electric energy and the operation cost are saved.
Description
Technical Field
The invention belongs to the field of energy engineering, relates to a geothermal energy single-well heat exchange and heat extraction technology, and particularly relates to a multi-pipe backflow type middle-deep geothermal energy single-well heat extraction water-free heat supply system.
Background
Geothermal energy has become an important alternative to traditional fossil energy as a renewable clean energy, and medium-deep geothermal energy has been developed and utilized mainly due to its advantages of large storage capacity, wide distribution range, and strong stability. The traditional exploitation and irrigation combined development mode has the problems of incomplete geothermal water recharging, a series of problems of geothermal well water level reduction, insufficient heat supply, resource and environment pollution and the like, and has huge ecological environment hidden dangers.
In order to promote scientific and reasonable development and utilization of geothermal resources and further standardize the management of geothermal water extraction, the recharge quantity of the geothermal tail water in the same layer of the geothermal well is required to be not less than 95 percent in the prior art, if the geothermal well cannot reach the standard, the geothermal well needs to be shut down, and the shut-down of the geothermal well brings huge resource waste.
In order to solve the technical problems, a geothermal energy development mode of 'taking heat but not taking water' is developed at the same time, but the traditional closed sleeve heat exchange system takes heat conduction as a main heat exchange mode, only utilizes the well wall to exchange heat, has small heat exchange area and low heat exchange efficiency, and cannot meet the heat supply requirement; although the open sleeve heat exchange system increases the heat exchange mode of heat convection, the heat exchange time and the heat exchange area are relatively less, and the heat exchange effect is not obviously improved. Meanwhile, a middle-deep layer interference-free geothermal development mode is that a double-pipe heat exchanger is arranged in a geothermal well, medium water is introduced into the geothermal well through an outer pipe and exchanges heat with surrounding rock soil and the like, the medium water is conveyed to the ground through an inner pipe to obtain heat, and then the medium water enters the geothermal well through the outer pipe. The mode does not interfere with underground water, heat is taken through medium water, but the indirect heat exchange mode causes lower heat exchange quantity and cannot meet the requirement of central heating, and the mode has higher initial investment and operation cost and is not economical.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a multi-pipe backflow type heat supply system for heating and not taking water from the middle-deep geothermal energy single well, and solves the technical problems of poor heat exchange effect and low heat taking amount of the single well in the existing single well for heating and not taking water on the premise of complete backflow of the geothermal tail water of the geothermal well, thereby further improving the utilization efficiency of geothermal energy resources of the middle-deep geothermal well.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a multi-pipe backflow type middle-deep geothermal energy single-well heat-taking and water-non-taking heat supply system comprises a middle-deep geothermal well, wherein the geothermal well sequentially penetrates through an underground cover layer and a water-taking layer to a deep middle-high temperature geothermal reservoir, an underground heat exchanger is installed in the geothermal well, the underground heat exchanger is upwards connected with ground heat supply equipment through a heat supply and return water pipe, the lower part of the underground heat exchanger is connected with a geothermal circulating water pipe, a pump chamber is arranged in the geothermal circulating water pipe, the geothermal circulating water pipe is inserted to the upper part of the water-taking layer of the geothermal well, a backflow pipe group consisting of a plurality of unit pipe bundles is coaxially arranged around the upper part of the water-taking layer of the lower part of the geothermal circulating water pipe, the three backflow pipe sealing plates comprise an upper water blocking sealing plate, a middle water blocking sealing plate and a lower water blocking sealing plate, the upper part of the backflow pipe group is fixed between a geothermal well wall and the outer wall of the geothermal circulating water pipe by the upper water blocking plate, and the downward water flow of the backflow pipe group protrudes out of the upper water blocking sealing plate; the middle part and the lower part water retaining sealing plate are respectively arranged at the middle part of the backflow pipe group to block the water flow extending upwards from the shaft, and the outlet of the backflow pipe group also protrudes below the lower part water retaining sealing plate.
Upper portion manger plate closing plate, geothermal circulation water pipe and backward flow nest not only can be fixed in the design of middle part manger plate closing plate and lower part manger plate closing plate, can also play the effect that blocks the water entering geothermal water return channel in the water layer of getting, make the hot water after the heat transfer all get into geothermal circulation water pipe in the water layer of getting, geothermal circulation water pipe can be fixed on the one hand to middle part manger plate closing plate and lower part manger plate closing plate, can prevent on the one hand that the low temperature ground hot water that backward flow nest of tubes flows from directly getting into geothermal circulation water pipe, make its all enter into and take and carry out abundant heat transfer in the water layer, in order to improve heat recovery and heat exchange efficiency.
The low-temperature heat supply backwater after heat release of the heat supply user end enters the geothermal well, and heat exchange is carried out between the underground heat exchanger in the geothermal well and high-temperature geothermal water which upwards flows into the underground heat exchanger through a geothermal circulating water pipe, so that the underground heat exchange of 'taking heat without taking water' is realized.
Further, the heat exchanger in pit include heat exchange chamber, heat supply circulating water switching-over room and geothermal water room, heat exchange chamber upper portion connect the heat supply and supply the wet return, sub-unit connection heat supply circulating water switching-over room, heat supply wet return separate into heat supply circulating water supply inlet and heat supply circulating water return mouth by the baffle, be provided with into water heat exchange nest of tubes and play water heat exchange nest of tubes in the heat exchange chamber, the heat supply circulating water inlet is connected into water heat exchange nest of tubes entry, the heat supply circulating water switching-over room import of water-intake heat exchange nest of tubes exit linkage, the entry of heat supply circulating water switching-over room exit linkage play water heat exchange nest of tubes, the exit linkage heat supply circulating water delivery port of play water heat exchange nest of tubes.
Furthermore, the geothermal water chamber is sleeved outside the heat supply circulating water reversing chamber, the upper part of the geothermal water chamber is connected with the heat exchange chamber, the lower part of the geothermal water chamber is connected with a geothermal circulating water pipe, a geothermal water inlet is formed in the joint of the lower part of the heat exchange chamber and the heat supply circulating water reversing chamber, and geothermal water outlets are formed in two sides of the upper part of the heat exchange chamber.
Low-temperature geothermal water after heat exchange with the heat supply circulating water in the underground heat exchanger flows out through geothermal water outlets on two sides of the upper part of the geothermal water chamber and flows into the underground water taking layer to realize new heat exchange, the geothermal water after heat absorption upwards enters the geothermal circulating water pipe again through gaps of the unit pipe bundles of the backflow pipe group, and then enters the underground heat exchanger to exchange heat with the low-temperature heat supply circulating water again, so that the utilization of circulating geothermal water is realized.
Further, the pump chamber set up on geothermal circulation water pipe, will in the pump chamber geothermal circulation water pipe separate into upper portion pipe and lower part pipe, upper portion pipe and lower part pipe pass through the ring flange and connect, and the intraductal coaxial cover in lower part is equipped with the immersible pump, and the pump line setting of immersible pump is intraductal in the lower part, and the upper portion of this pump line and geothermal circulation water pipe's upper portion UNICOM be provided with the closed tube on the ring flange, this closed tube lower part cartridge is between the pump line of lower part pipe and immersible pump, and this closed tube upper portion upwards leads to ground on the ring flange, one side of closed tube is provided with the cable seal interface.
The high-temperature geothermal water entering the geothermal circulating water pipe through the return pipe bundle passes through the connecting flange plate to enter the geothermal circulating water pipe at the upper part under the action of the submersible pump in the pump chamber, and then enters the underground heat exchanger to perform the heat exchange process. After the pump chamber is arranged, the pump pipe on the upper part of the submersible pump can be reduced, the original pump pipe and the geothermal circulating water pipe are combined into a whole, and meanwhile, the communicating pipe is arranged at the flange opening, so that the local vacuum can be prevented from being formed between the pump pipe and the geothermal circulating water pipe.
The invention has the advantages and positive effects that:
1. this system is near getting near the water layer through geothermal circulation water pipe rather than the return pipe group that sets up on every side with the geothermal water introduction bottom of a well, make the geothermal water that flows back can fully absorb the heat of upper portion manger plate closing plate top pit shaft surrounding cap layer, can flow into again under the effect of reflux pressure and get in the water layer and carry out the heat transfer, and receive the influence of gravity and formation pressure, the velocity of flow of backward flow geothermal water reduces and the heat transfer area increase in getting the water in situ, make the heat transfer effect obtain great promotion.
2. The three-layer fixed water baffle is additionally arranged in the system, so that the pipeline in the intermediate-deep geothermal layer can be well fixed, the service life of a geothermal well is prolonged, meanwhile, backflow geothermal water which is not subjected to complete heat exchange can be prevented from entering the inside of a geothermal circulating water pipe, the geothermal circulating water pipe can be enabled to completely enter a water taking layer for heat exchange, and the heat collection amount and the heat exchange efficiency of the system are improved.
3. In order to realize the functions of 'taking heat but not taking water' and fully finishing heat exchange, the system innovatively designs the structure of the underground heat exchanger, and heating circulating water in the underground heat exchanger can absorb geothermal water in a water inlet heat exchange tube group and can realize secondary heat absorption in a water outlet heat exchange tube group, so that the heat in the geothermal water is more completely utilized; meanwhile, the circulating water and the high-temperature geothermal water complete heat transfer in the underground heat exchanger, so that the process of 'taking heat but not taking water' is really realized, the geothermal water after heat exchange directly flows back to a geothermal well from the underground heat exchanger, the geothermal water does not flow out of a well mouth, and the environmental protection requirement of the current geothermal heating is met.
4. The pump chamber of the immersible pump that this system increased reduces the pump line length on immersible pump upper portion, closes original pump line and geothermol power circulating water pipe as an organic whole, and then has reduced the construction cost of system, sets up the closed tube at the flange mouth simultaneously, can prevent to form the local vacuum between pump line and the geothermol power circulating water pipe.
5. The underground heat exchanger newly added in the system is arranged at a position below a still water level in a well under the same geothermal well condition, geothermal water needs to be lifted out of a well head in the traditional heat taking process, and the underground heat exchanger of the system only needs to lift the geothermal water into the underground heat exchanger, so that the power consumption of the submersible pump is greatly reduced, the electric energy is saved, and the operation cost of the heat taking system is further reduced.
6. The system adopts the heat collection mode of 'external injection and internal discharge', is different from the traditional 'internal injection and external discharge' mode, avoids the contact between high-temperature geothermal water after heat exchange and the wall of a geothermal well, reduces the heat loss of the high-temperature geothermal water in the flowing process, and improves the overall heat collection efficiency of the system.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic view of the downhole heat exchanger of FIG. 1;
FIG. 3 is a schematic diagram of the pump chamber of FIG. 1;
FIG. 4 is a schematic diagram of the structure of the return stack of FIG. 1;
FIG. 5 is a top view of the upper water-retaining sealing plate of the return pipe group;
FIG. 6 is a top view of the middle water-retaining sealing plate of the return pipe group.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
The invention relates to a multi-pipe reflux type single-well heat-taking and non-water-taking heat supply system for middle-deep geothermal energy, wherein an underground heat exchanger is arranged in a geothermal well, the underground heat exchanger is upwards connected with ground heat supply equipment through a heat supply and water return pipe, the lower part of the underground heat exchanger is connected with a geothermal circulating water pipe, a pump chamber is arranged in the geothermal circulating water pipe, the pump chamber is composed of a special structure and comprises main components such as a submersible pump and the like, the geothermal circulating water pipe is inserted to the upper part of a water taking layer of the geothermal well, meanwhile, a reflux pipe group composed of a plurality of unit pipe bundles is coaxially arranged around the upper part of the water taking layer at the lower part of the geothermal circulating water pipe, the reflux pipe group is communicated to the bottom of the well and provided with an opening, and three water retaining sealing plates are arranged between the water taking layer of the geothermal well along the reflux pipe group.
The system utilizes a geothermal circulating water pipe to separate geothermal backflow cold water and geothermal rising hot water; geothermal reflux cold water flows through the outer layer of the geothermal circulating water pipe, can absorb heat from a cover layer around a shaft, is directly conveyed to the bottom (bottom) of a water taking layer through a reflux pipe group, flows into the geothermal water taking layer under the action of reflux pressure and a water retaining sealing plate to be further heated, is sucked by a submersible pump to enter the geothermal circulating water pipe from a gap of the reflux pipe group, enters a downhole heat exchanger to exchange heat with heating circulating water, and finally flows back to the shaft through an opening at the upper part of the geothermal circulating water pipe to form circulating heat exchange flow. In the process, the heat exchange of the geothermal water is more complete, and the heat taking amount is higher; on the basis, the invention innovatively creates the reflux pipe group, the water retaining sealing plate, the built-in pump chamber and the underground heat exchanger structure, and in the heat taking process, geothermal water does not flow out of a well mouth completely, so that the heat taking without water taking is realized in the true sense, the power consumption of the submersible pump is greatly reduced while the heat exchange and heat taking are realized efficiently, and the electric energy and the operation cost are saved.
Specifically, a multitube backflow type middle-deep geothermal energy single-well heat-taking and water-non-taking heat supply system comprises a middle-deep geothermal well 4, wherein the middle-deep geothermal well sequentially penetrates through a ground cover layer 7 and a water-taking layer 9 to a deep high-temperature heat reservoir layer 10, an underground heat exchanger 3 is installed in a geothermal well, the upper part of the underground heat exchanger is connected with a heat supply and water-returning pipe 2, the lower part of the underground heat exchanger is connected with a geothermal circulating water pipe 5, the geothermal circulating water pipe is inserted into the ground water-taking layer, a pump chamber 6 is arranged inside the geothermal circulating water pipe, a backflow pipe group 8 consisting of a plurality of unit pipe bundles 8-1 is coaxially arranged around the lower part of the geothermal circulating water pipe, and the backflow pipe group is installed on the geothermal circulating water pipe through a fixed water baffle 11.
As shown in fig. 2, the downhole heat exchanger comprises a heat exchange chamber 3-1, a heat supply and return water reversing chamber 3-2 and a geothermal water chamber 3-3, wherein the upper part of the heat exchange chamber is connected with a heat supply and return water pipe, the lower part of the heat supply and return water pipe is connected with the heat supply and return water reversing chamber, the heat supply and return water pipe is divided into a heat supply and return water inlet 2-1 and a heat supply and return water outlet 2-2 by a partition plate, a water inlet heat exchange pipe group 3-1-1 and a water outlet heat exchange pipe group 3-1-2 are arranged in the heat exchange chamber, the heat supply and return water inlet is connected with the inlet of the water inlet heat exchange pipe group, the outlet of the heat supply and return water reversing chamber is connected with the inlet of the water outlet heat exchange pipe group, the outlet of the water outlet heat exchange pipe group is connected with the heat supply and return water outlet, the geothermal water chamber is sleeved outside the heat supply and return water chamber, the upper part of the geothermal water chamber is connected with the geothermal water pipe, the lower part of the heat exchange chamber is connected with the geothermal water inlet 3-3-1-1, and the geothermal water outlet are arranged at the two sides of the upper part of the heat exchange chamber.
The low-temperature heat supply circulating water after heat release from the heat supply equipment 1 circularly enters a heat exchange chamber of the underground heat exchanger through a heat supply circulating water inlet, exchanges heat with geothermal water which upwards flows into a geothermal water chamber of the underground heat exchanger through a geothermal circulating water pipe in a water inlet heat exchange pipe group, then flows through a heat supply circulating water reversing chamber, and flows out of an outlet of a water outlet heat exchange pipe group to a heat supply circulating water outlet, so that the heat exchange process of primary heat supply circulating water and geothermal water is completed.
As shown in fig. 3, the pump chamber is arranged on the geothermal circulating water pipe, the geothermal circulating water pipe is divided into an upper pipe 5-2 and a lower pipe 5-1 in the pump chamber, the upper pipe and the lower pipe are connected through a flange 6-5, a submersible pump 6-4 is coaxially sleeved in the lower pipe, a pump pipe 6-3 of the submersible pump is arranged in the lower pipe, the upper part of the pump pipe is communicated with the upper part of the geothermal circulating water pipe, a communicating pipe 6-1 is arranged on the flange, the lower communicating pipe is inserted between the lower pipe and the pump pipe of the submersible pump, and the upper part of the communicating pipe is upwards communicated with the ground to prevent partial vacuum from being formed between the pump pipe and the geothermal circulating water pipe. And a cable sealing interface 6-2 is arranged on one side of the communicating pipe on the flange plate.
The high-temperature geothermal water entering the geothermal circulating water pipe through the return pipe bundle passes through the connecting flange plate to enter the upper pipe of the geothermal circulating water pipe under the action of the submersible pump in the pump chamber and then enters the underground heat exchanger to perform the heat exchange process. After the pump chamber is arranged, the distance between the pump pipe at the upper part of the submersible pump in the prior art can be effectively reduced, the pump pipe and the geothermal circulating water pipe are integrated, and meanwhile, the communicating pipe is arranged to the ground, so that the local vacuum can be prevented from being formed between the pump pipe and the geothermal circulating water pipe.
As shown in fig. 4, 5 and 6, the fixed water baffle for fixing the backflow pipe group includes an upper water baffle sealing plate 11-1, a middle water baffle sealing plate 11-2 and a lower water baffle sealing plate 11-3, the upper water baffle sealing plate fixes the upper part of the backflow pipe group between the geothermal well wall and the outer wall of the geothermal circulating water pipe to block the downward water flow along the well shaft, and the inlet of the backflow pipe group protrudes above the upper water baffle sealing plate; the middle water retaining sealing plate and the lower water retaining sealing plate are respectively arranged in the middle of the backflow pipe group to block water flow extending upwards of the shaft, and the outlet of the backflow pipe group also protrudes below the lower water retaining sealing plate.
Low-temperature geothermal water after finishing heat exchange in the underground heat exchanger with the heat supply circulating water flows out through the backflow pipe group via geothermal water outlets on two sides of the upper part of the geothermal water chamber, flows in from inlets on the upper parts of the unit pipe bundles, directly reaches the bottom of the geothermal well after flowing out and then flows upwards through the bottom of the water taking layer, secondary heat exchange is realized in the water taking layer, and the secondary heat exchange is carried out through the gap of the unit pipe bundles on the upper part of the water taking layer, so that the secondary heat exchange enters the geothermal circulating water pipe again upwards, and then enters the underground heat exchanger to carry out heat exchange with the low-temperature heat supply circulating water after secondary circulation.
Specifically, the multi-pipe reflux type single well heat extraction, injection, heat exchange and heat extraction system for the geothermal energy in the middle and deep layers provided by the invention has the working process as follows:
the high-temperature geothermal water absorbed by the underground water taking layer passes through the connecting flange plate to enter the geothermal circulating water pipe on the upper part under the action of the submersible pump in the pump chamber, then enters the geothermal water chamber in the underground heat exchanger, and continuously enters the heat exchange chamber upwards, the geothermal water in the heat exchange chamber fully exchanges heat with low-temperature heating circulating water, and flows out from the geothermal water outlet after heat exchange, the geothermal water after heat release flows downwards to continuously absorb heat in the stratum and reaches the return pipe group near the water taking layer, because the blocking of the upper water retaining sealing plate, the geothermal water can only flow into the water taking layer inlet at the bottom of the geothermal well through the unit pipe bundle, one part of the geothermal water entering the water taking layer flows back to the deep part of the water taking layer, the other part of the geothermal water flows upwards under the action of the stratum pressure and the submersible pump, flows out from the water taking layer outlet after fully absorbing the heat in the water taking layer, flows through gaps of the unit pipe bundles of the return pipe group, and flows into the heat exchanger through the geothermal circulating water pipe under the action of the submersible pump to carry out the next heat exchange process.
In the underground heat exchanger, low-temperature heat supply circulating water from heat supply equipment flows through a heat supply circulating water inlet to enter a heat exchange chamber of the underground heat exchanger, exchanges heat with geothermal water which upwards flows into a geothermal water chamber of the underground heat exchanger through a geothermal circulating water pipe in a water inlet heat exchange pipe group, then flows through a heat supply circulating water reversing chamber, flows out from an outlet of a water outlet heat exchange pipe group to a heat supply circulating water outlet, then enters the heat supply equipment to release heat, and circulates in sequence.
The whole circulation heat exchange process of the geothermal water is carried out underground, so that the heat exchange process of 'taking heat without taking water' in the true sense is realized, and for the geothermal well with lower still water level, the power consumption of the submersible pump can be greatly reduced by utilizing the underground heat exchanger, and the electric energy and the operation cost are saved.
Although the embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the embodiments disclosed.
Claims (7)
1. The utility model provides a multitube backward flow formula middle and deep geothermal energy single well is got heat and is not got water heating system, includes middle and deep geothermal well, and this middle and deep geothermal well passes underground cover, water intaking layer to deep high temperature heat reservoir, its characterized in that in proper order: the underground heat exchanger is installed in a geothermal well, the upper part of the underground heat exchanger is connected with a heat supply and return water pipe, the lower part of the underground heat exchanger is connected with a geothermal circulating water pipe, the geothermal circulating water pipe is inserted into an underground water taking layer, a pump chamber is arranged in the geothermal circulating water pipe, a backflow pipe group formed by a plurality of unit pipe bundles is coaxially arranged around the upper part of the lower water taking layer of the geothermal circulating water pipe, and the backflow pipe group is installed on the geothermal circulating water pipe through a fixed water baffle plate.
2. The system of claim 1, wherein the system comprises: the underground heat exchanger comprises a heat exchange chamber, a heat supply circulating water reversing chamber and a geothermal water chamber, wherein the upper part of the heat exchange chamber is connected with a heat supply water return pipe, the lower part of the heat exchange chamber is connected with the heat supply circulating water reversing chamber, the heat supply water return pipe is divided into a heat supply circulating water inlet and a heat supply circulating water outlet by a partition plate, a water inlet heat exchange pipe group and a water outlet heat exchange pipe group are arranged in the heat exchange chamber, the heat supply circulating water inlet is connected with the inlet of the water inlet heat exchange pipe group, the outlet of the water inlet heat exchange pipe group is connected with the inlet of the heat supply circulating water reversing chamber, the outlet of the heat supply circulating water reversing chamber is connected with the inlet of the water outlet heat exchange pipe group, the outlet of the water outlet heat exchange pipe group is connected with the heat supply circulating water outlet, the geothermal water chamber is sleeved outside the heat supply circulating water reversing chamber, the upper part of the geothermal water chamber is connected with the heat exchange chamber, and the lower part of the geothermal circulating water pipe is connected.
3. The system of claim 2, wherein the system comprises: the joint of the lower part of the heat exchange chamber and the heat supply circulating water reversing chamber is provided with a geothermal water inlet, and two sides of the upper part of the heat exchange chamber are provided with geothermal water outlets.
4. The system of claim 1, wherein the system comprises: the pump chamber set up on geothermal circulation water pipe, will in the pump chamber geothermal circulation water pipe separate into upper portion pipe and lower part pipe, upper portion pipe and lower part pipe pass through the ring flange and connect, at intraductal coaxial cover in the lower part be equipped with the immersible pump, the pump line setting of immersible pump is intraductal in the lower part, the upper portion of this pump line and the upper portion UNICOM of geothermal circulation water pipe be provided with the closed tube on the ring flange, this closed tube lower part cartridge is between the pump line of lower part pipe and immersible pump, this closed tube upper portion upwards leads to ground.
5. The system of claim 4, wherein the system comprises: and a cable sealing interface is arranged on one side of the communicating pipe on the flange plate.
6. The system of claim 1, wherein the system comprises: the fixed water baffle comprises an upper water baffle sealing plate, a middle water baffle sealing plate and a lower water baffle sealing plate, the upper water baffle sealing plate fixes the upper part of the backflow pipe group between the geothermal well wall and the outer wall of the geothermal circulating water pipe, the inlet of the backflow pipe group protrudes above the upper water baffle sealing plate, the middle water baffle sealing plate and the lower water baffle sealing plate are respectively arranged in the middle of the backflow pipe group, and the outlet of the flow pipe group also protrudes below the lower water baffle sealing plate.
7. The system of claim 1, wherein the system comprises: the geothermal circulating water pipe and the reflux pipe group adopt metal vacuum heat-insulating pipes or plastic high-temperature-resistant heat-insulating pipes.
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| CN112833573A (en) * | 2020-12-31 | 2021-05-25 | 魏巍 | Medium-deep geothermal energy same-well balanced mining and irrigating heat exchange system and application |
| CN114719456A (en) * | 2021-01-06 | 2022-07-08 | 天津大学 | Underground heat transfer enhancement system for medium-deep geothermal energy |
| CN112856839A (en) * | 2021-03-29 | 2021-05-28 | 青海九零六工程勘察设计院 | Geothermal mining and irrigating equipment special for geothermal energy |
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