阅读说明：本技术 地热回灌井深层换热系统 (Deep heat exchange system of geothermal recharge well ) 是由 雷炯 翟志祥 田康 于 2020-05-29 设计创作，主要内容包括：本发明公开了地热回灌井深层换热系统,涉及地热供暖技术领域。包括采水机构、换热机构和回灌机构,采水机构通过换热机构与回灌机构相连通,换热机构包括第一板式换热器、三通管、第二板式换热器、换热管网和回灌管网。通过设置采水机构、换热机构和回灌机构,整个装置可以通过回灌井额外获得一部分热量,提供更大的供暖面积、经济性,回灌井内形成循环系统,而非单纯的挤压作用,地热水中的颗粒会在井筒内自然流速的作用下,随着循环运移,而非进入地层,造成地层堵塞,影响回灌量,井内循环系统可以冲刷、清洗井壁与井底,保证井筒内部的清洁,从而维护回灌井的回灌能力,减轻衰减。(The invention discloses a deep heat exchange system of a geothermal recharging well, and relates to the technical field of geothermal heating. The water recovery system comprises a water recovery mechanism, a heat exchange mechanism and a recharge mechanism, wherein the water recovery mechanism is communicated with the recharge mechanism through the heat exchange mechanism, and the heat exchange mechanism comprises a first plate heat exchanger, a three-way pipe, a second plate heat exchanger, a heat exchange pipe network and a recharge pipe network. Through setting up water production mechanism, heat transfer mechanism and recharging mechanism, whole device can additionally obtain partly heat through the recharging well, provide bigger heating area, economy, form circulation system in the recharging well, but not simple extrusion effect, granule in the geothermol power aquatic can be along with the circulation migration under the effect of the natural velocity of flow in the pit shaft, but not get into the stratum, cause the stratum to block up, influence recharging volume, circulation system can erode in the well, wash the wall of a well and shaft bottom, guarantee the inside cleanness of pit shaft, thereby maintain the recharging ability of recharging well, alleviate the decay.)

1. Geothermal recharge well deep heat exchange system comprises a water extraction mechanism (1), a heat exchange mechanism (2) and a recharge mechanism (3), and is characterized in that: the water production mechanism (1) is communicated with the recharge mechanism (3) through a heat exchange mechanism (2), the heat exchange mechanism (2) comprises a first plate type heat exchanger (21), a three-way pipe (22), a second plate type heat exchanger (23), a heat exchange pipe network (24) and a recharge pipe network (25), one end of the first plate type heat exchanger (21) is respectively connected with the second plate type heat exchanger (23) and the heat exchange pipe network (24) through the three-way pipe (22), and one end, far away from the three-way pipe (22), of the second plate type heat exchanger (23) is communicated with the recharge pipe network (25);

the recharging mechanism (3) comprises a recharging well (31), a heat exchange inner pipe (32) and a heat exchange inner pipe counterweight (33), the heat exchange inner pipe (32) is arranged inside the recharging well (31), one end, far away from the second plate type heat exchanger (23), of the recharging pipe network (25) is communicated with the recharging well (31), and one end, far away from the three-way pipe (22), of the heat exchange pipe network (24) is communicated with the heat exchange inner pipe (32).

2. The geothermal recharging well deep heat exchange system of claim 1, wherein: the water production mechanism (1) comprises a water production well (11), a submersible pump (12) and a water production pipe (13), the submersible pump (12) is arranged inside the water production well (11), and the water production pipe (13) is fixedly arranged at one end of the submersible pump (12).

3. The system of claim 2, wherein: one end of the water production pipe (13) far away from the submersible pump (12) extends to the outside of the water production well (11) and is communicated with the first plate type heat exchanger (21).

4. The geothermal recharging well deep heat exchange system of claim 1, wherein: and a heat exchange inner tube counterweight (33) is fixedly arranged at the bottom of the heat exchange inner tube (32).

5. The geothermal recharging well deep heat exchange system of claim 1, wherein: one end, far away from the heat exchange inner pipe counterweight (33), of the heat exchange inner pipe (32) extends to the outside of the recharging well (31) and is communicated with the heat exchange pipe network (24).

Technical Field

The invention relates to the technical field of geothermal heating, in particular to a deep heat exchange system of a geothermal recharging well.

Background

The heat energy is renewable heat energy from the inside of the earth, which is originated from the decay of rock pulp and radioactive substances in the earth, and the heat is continuously transferred from the lower high-temperature rock stratum to the upper low-temperature rock stratum through the heat conduction of the stratum, and the reserves are huge and renewable. Currently, geothermal energy can be divided into hydrothermal geothermal energy and dry hot rock from the utilization form:

1. in the prior art, hydrothermal geothermal energy is directly extracted by a submersible pump to obtain high-temperature hot water, low-temperature tail water is re-poured into a stratum through surface heat exchange, the whole system is poured to fix mining and re-pour on the same layer, water is not taken for heat extraction, the economic effect and the environmental protection effect are extremely high, but the only restriction factor of the project is the re-pouring amount of a re-pouring well, and if the problem of 100% re-pouring on the same layer cannot be solved, even if the temperature of a mining well is higher and the water quantity is larger, the large quantity of the mining well cannot be utilized.

2. In the prior art, a hot dry rock system utilizes deep well heat exchange or casing pipe heat exchange, a geothermal well completely separates the inside of a shaft from the stratum outside the shaft through a casing pipe and an artificial well bottom, no matter exchange occurs between the inside and the outside of the shaft, a heat preservation pipe is arranged in the shaft, surface cold water moves downwards from an annular space outside the heat preservation pipe, the surface cold water is gradually heated to the well bottom and returns to the surface through the inside of the heat preservation pipe, the whole system is circulated in the well to lift the cold water to warm hot water for utilization, however, for a deep well heat exchange system, sustainable long-meter heat exchange heat is generally not more than 150W/m, if high heat exchange quantity is exerted in a short period, the temperature of a heat exchange water return pipe can be rapidly reduced, and the stratum needs longer time to recover the temperature, therefore, the economic cost is considered, if the area does not belong to a geothermal high-temperature abnormal zone, that is only economically feasible when no additional investment is required for drilling and the system is operated at low loads.

Disclosure of Invention

The invention provides a deep heat exchange system of a geothermal recharging well, which has the advantages that the bottom of the recharging well can be prevented from silting up and blocking a water filter pipe, the impurities of recharging tail water can pass through an inner pipe and are brought to the ground surface instead of entering a stratum through a flow rate effect, the recharging amount of the recharging well is ensured not to be attenuated, and a part of heat is additionally extracted from the recharging well, so that a larger economic effect is realized, so that the problems that the 100 percent recharging problem of the same layer cannot be solved by adopting hydrothermal geothermal energy and the economic cost investment is high by adopting a dry-hot rock system are solved.

In order to prevent siltation at the bottom of a recharging well, block a water filter pipe and ensure that the recharging amount of the recharging well is not reduced by leading impurities in the recharging tail water to pass through an inner pipe belt and the ground surface rather than enter a stratum through a flow rate effect and additionally extracting a part of heat from the recharging well to realize the aim of larger economic effect, the invention provides the following technical scheme: the deep heat exchange system of the geothermal recharging well comprises a water collecting mechanism, a heat exchange mechanism and a recharging mechanism, wherein the water collecting mechanism is communicated with the recharging mechanism through the heat exchange mechanism, the heat exchange mechanism comprises a first plate heat exchanger, a three-way pipe, a second plate heat exchanger, a heat exchange pipe network and a recharging pipe network, one end of the first plate heat exchanger is respectively connected with the second plate heat exchanger and the heat exchange pipe network through the three-way pipe, and one end, away from the three-way pipe, of the second plate heat exchanger is communicated with the recharging pipe network;

the recharging mechanism comprises a recharging well, a heat exchange inner pipe and a heat exchange inner pipe counterweight, the heat exchange inner pipe is arranged inside the recharging well, one end, far away from the second plate heat exchanger, of the recharging pipe network is communicated with the recharging well, and one end, far away from the three-way pipe, of the heat exchange pipe network is communicated with the heat exchange inner pipe.

As a preferred technical scheme of the invention, the water recovery mechanism comprises a water recovery well, a submersible pump and a water recovery pipe, wherein the submersible pump is arranged in the water recovery well, and the water recovery pipe is fixedly arranged at one end of the submersible pump.

As a preferable technical scheme of the invention, one end of the water production pipe, which is far away from the submersible pump, extends to the outside of the water production well and is communicated with the first plate heat exchanger.

As a preferred technical scheme of the invention, the bottom of the heat exchange inner tube is fixedly provided with a heat exchange inner tube counterweight.

As a preferred technical scheme of the invention, one end of the heat exchange inner pipe, which is far away from the balance weight of the heat exchange inner pipe, extends to the outside of the recharging well and is communicated with the heat exchange pipe network.

Compared with the prior art, the invention provides a deep heat exchange system of a geothermal recharging well, which has the following beneficial effects:

this geothermal recharging well deep heat transfer system, through setting up water production mechanism, heat transfer mechanism and recharging mechanism, whole device can additionally obtain partly heat through recharging well, provide bigger heating area, economic nature, form circulation system in the recharging well, and not simple squeezing action, granule in the geothermal water can be under the effect of the natural velocity of flow in the pit shaft, along with the circulation migration, and not get into the stratum, cause the stratum to block up, influence recharging volume, well circulation system can erode, wash the wall of a well and shaft bottom, guarantee the inside cleanness of pit shaft, thereby maintain the recharging ability of recharging well, alleviate the decay.

Drawings

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

In the figure: 1. a water collecting mechanism; 11. a water recovery well; 12. a submersible pump; 13. a water production pipe; 2. a heat exchange mechanism; 21. a first plate heat exchanger; 22. a three-way pipe; 23. a second plate heat exchanger; 24. a heat exchange pipe network; 25. recharging a pipe network; 3. a recharging mechanism; 31. recharging the well; 32. a heat exchange inner tube; 33. and balancing the heat exchange inner pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the invention discloses a deep heat exchange system of a geothermal recharging well, which comprises a water collecting mechanism 1, a heat exchange mechanism 2 and a recharging mechanism 3, wherein the water collecting mechanism 1 is communicated with the recharging mechanism 3 through the heat exchange mechanism 2, the heat exchange mechanism 2 comprises a first plate heat exchanger 21, a three-way pipe 22, a second plate heat exchanger 23, a heat exchange pipe network 24 and a recharging pipe network 25, the first plate heat exchanger 21 and the second plate heat exchanger 23 are of conventional structures, the working principle of the system is the prior art, one end of the first plate heat exchanger 21 is respectively connected with the second plate heat exchanger 23 and the heat exchange pipe network 24 through the three-way pipe 22, and one end of the second plate heat exchanger 23, which is far away from the three-way pipe 22, is communicated with the recharging pipe network 25;

the recharging mechanism 3 comprises a recharging well 31, a heat exchange inner pipe 32 and a heat exchange inner pipe counterweight 33, the heat exchange inner pipe 32 is arranged in the recharging well 31, one end of the recharging pipe network 25, which is far away from the second plate heat exchanger 23, is communicated with the recharging well 31, one end of the heat exchange pipe network 24, which is far away from the three-way pipe 22, is communicated with the heat exchange inner pipe 32, the whole device can additionally obtain a part of heat through the recharging well 31 by arranging the water collecting mechanism 1, the heat exchange mechanism 2 and the recharging mechanism 3, so that larger heating area and economy are provided, a circulating system is formed in the recharging well 31 instead of simple extrusion, particles in geothermal water can be circularly transported and do not enter the ground layer under the action of natural flow velocity in the shaft, so that the ground layer is blocked, the recharging amount is influenced, the circulating system in the well can wash and clean the well wall and well bottom to ensure the inside of the, thereby maintaining the recharge capability of the recharge well 31 and reducing the attenuation.

Specifically, water recovery mechanism 1 includes water recovery well 11, immersible pump 12 and water production pipe 13, the inside of water recovery well 11 is provided with immersible pump 12, and immersible pump 12 is conventional structure, and its theory of operation is prior art, the fixed water production pipe 13 that is provided with of one end of immersible pump 12, the one end that water production pipe 13 kept away from immersible pump 12 extends to the outside of water recovery well 11 and is linked together with first plate heat exchanger 21.

In this embodiment, the high-temperature hot water in the water recovery well 11 is extracted by the submersible pump 12, and the high-temperature hot water is extracted to the ground surface and is subjected to heat exchange by the first plate heat exchanger 21 and the second plate heat exchanger 23.

Specifically, a heat exchange inner tube counterweight 33 is fixedly arranged at the bottom of the heat exchange inner tube 32.

In this embodiment, because PE pipe density is lighter, the bottom of heat transfer inner tube 32 need increase high density material heat transfer inner tube counter weight 33 and carry out the counter weight, and heat transfer inner tube counter weight 33 can adopt the iron plate to ensure that heat transfer inner tube 32 normally descends into, and at the in-process of operation, do not push up to recharge well 31 mouths because of the buoyancy, cause the risk.

Specifically, one end of the heat exchange inner pipe 32, which is far away from the heat exchange inner pipe counterweight 33, extends to the outside of the recharge well 31 and is communicated with the heat exchange pipe network 24.

In this embodiment, the heat exchange inner tube 32 is a PE tube, and the PE inner tube has a better heat insulating property than a metal tube, and can reduce heat loss, so that the recharge tail water can be circulated and heated in the recharge well 31 and then kept at a higher temperature.

The working principle and the using process of the invention are as follows: when the device is used, high-temperature hot water in the water production well 11 is extracted through the submersible pump 12, the high-temperature hot water is extracted to the ground surface and is exchanged through the first plate heat exchanger 21 and the second plate heat exchanger 23, tail water after heat exchange through the second plate heat exchanger 23 is back-filled into the back-filling well 31 through the back-filling pipe network 25, the tail water is back-filled to the bottom of the back-filling well 31 and is back-filled to the heat exchange pipe network 24 through the inside of the heat exchange inner pipe 32, circulating water in the back-filling well 31 is geothermal water and needs to be merged into the position behind the first plate heat exchanger 21 and before the second plate heat exchanger 23 for two-stage heat exchange, if multi-stage heat exchange exists, the position with approximate temperature is selected and; the heat exchange flow of the recharging well 31 is one fourth of the recharging capacity, the heat exchange water amount is too small, the single well length-extending heat exchange value is too low, the heat exchange water amount is too large, the circulated water is merged into the heat exchange pipe network 24 behind the first plate heat exchanger 21, the heat exchange energy efficiency ratio of the second plate heat exchanger 23 is influenced to a higher degree, and the operation of the device is completed through the above steps.

In conclusion, the deep heat exchange system of the geothermal recharging well is provided with the water collecting mechanism 1, the heat exchange mechanism 2 and the recharging mechanism 3, the whole device can additionally obtain a part of heat through the recharging well 31 to provide larger heating area and economy, a circulating system is formed in the recharging well 31 instead of a simple squeezing effect, particles in geothermal water can move along with circulation under the action of natural flow velocity in a shaft instead of entering a stratum to cause stratum blockage and influence recharging amount, the circulating system in the well can wash and clean the wall and the bottom of the well to ensure the cleanness of the inside of the shaft, so that the recharging capacity of the recharging well 31 is maintained, and attenuation is reduced.

It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.