Flexible heat exchanger-based tunnel seepage water energy utilization system and method

Abstract

The present invention relates to the technical field of geothermal systems, and provides a flexible heat exchanger-based tunnel seepage water energy utilization system and method. The system comprises a seepage water pipe system, an overflow water pipe system, and an energy storage tank. The interior of the energy storage tank is divided into multiple interconnected subspaces, and each subspace is internally provided with a flexible heat exchanger. The seepage water pipe system and the overflow water pipe system each comprise upper and lower systems, an upper seepage water pipe system is paired with a lower overflow water pipe system, a lower seepage water pipe system is paired with an upper overflow water pipe system, and different paired systems are activated depending on the season. Tunnel seepage water enters the subspaces of the energy storage tank by means of the seepage water pipe system, exchanges heat with the flexible heat exchangers, and then is discharged by means of the overflow water pipe system. The present invention fully utilizes the energy contained in seepage water to provide cooling energy or heat energy for terminal units in a building, is environmentally friendly, economical and practical, and has the advantages of high heat exchange efficiency and long service life.

Description

Tunnel seepage water energy utilization system and method based on flexible heat exchanger

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202410654757.6 filed on May 24, 2024 with the State Intellectual Property Office of China and entitled "Tunnel seepage water energy utilization system and method based on flexible heat exchanger", the content of which is incorporated herein by reference in its entirety and forms a part of this application for all purposes. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of geothermal systems, in particular to a tunnel seepage water energy utilization system and method based on flexible heat exchanger. BACKGROUND

[0004] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute the prior art.

[0005] Tunnels are generally located in mountains (mountain tunnel) or underwater (underwater, river tunnel), etc. There are often a lot of rainwater seepage, underground structure water leakage or seawater, river water seepage, etc. If not discharged in time, it will cause corrosion to the tunnel related equipment, and even affect the structural safety of the tunnel. Therefore, during the operation of the tunnel, the tunnel seepage water needs to be discharged regularly. The discharged seepage water is directly discharged through the municipal rainwater pipeline, or used for farmland irrigation, groundwater recharge, artificial wetland construction, fire water supply, road watering, etc. At present, the application of tunnel seepage water is mainly the application of the water body itself, and the energy application of seepage water is less.

[0006] After the seepage water is filtered by the soil, not only the water quality is good, but also the seepage water continuously exchanges heat with the soil during the seepage process. The temperature of the seepage water is higher than the outdoor air temperature in winter and lower than the outdoor air temperature in summer, and the temperature change is relatively stable, which is suitable for water source heat pump systems. At the same time, the water quantity of general seepage water is relatively stable, such as underwater tunnel seepage. Therefore, tunnel seepage water has the characteristics of suitable water quality, stable water temperature and sufficient water quantity, and is a natural cold and heat source with obvious advantages.

[0007] SUMMARY

[0008] In view of the above defects, the present disclosure provides a tunnel seepage water energy utilization system and method based on flexible heat exchanger, which fully utilizes the energy contained in the tunnel seepage water to provide cold or heat for building ends, and is environmentally friendly, economical, practical, high in heat exchange efficiency and long in service life.

[0009] To achieve the above object, the present disclosure adopts the following technical solutions:

[0010] The present disclosure provides a tunnel seepage water energy utilization system based on flexible heat exchangers, comprising a seepage water pipe system, an overflow water pipe system and an energy storage pool.

[0011] The inside of the energy storage pool is divided into multiple subspaces that are interconnected, and each of the subspaces is provided with a flexible heat exchanger.

[0012] The seepage water pipe system and the overflow water pipe system each comprise two systems, and the upper seepage water pipe system is matched with the lower overflow water pipe system, and the lower seepage water pipe system is matched with the upper overflow water pipe system, and different matched systems are opened according to different seasons.

[0013] The tunnel seepage water enters each subspace of the energy storage pool through the seepage water pipe system, exchanges heat with the flexible heat exchanger, and is discharged through the overflow water pipe system.

[0014] As a further implementation, the flexible heat exchanger comprises water supply branch pipes and backwater branch pipes, and the water supply branch pipes and the backwater branch pipes are connected through multiple pipe seats composed of parallel flexible fine pipes.

[0015] As a further implementation, the seepage water pipe system comprises a seepage water main pipe and seepage water branch pipes, one end of the seepage water branch pipes is connected with the seepage water main pipe, and the other end is connected with two seepage water distribution pipes respectively.

[0016] Control valves are installed on the two seepage water distribution pipes.

[0017] The number of seepage water branch pipes is matched with the number of subspaces in the energy storage pool.

[0018] As a further implementation, the overflow water pipe system comprises an overflow water main pipe, the overflow water main pipe is connected with the upper overflow water pipe system and the lower overflow water pipe system respectively, and the pipe connection structures of the upper and lower overflow water pipe systems are the same.

[0019] As a further implementation, the upper overflow water pipe system comprises an upper overflow water main pipe, the upper overflow water main pipe is connected with an upper overflow water header, the upper overflow water header is connected with multiple upper overflow water branch pipes, and the upper overflow water branch pipes are connected with each subspace of the energy storage pool.

[0020] A control valve is installed on the upper overflow water main pipe.

[0021] As a further implementation, a seepage water drainage pump is further arranged in the energy storage pool, the seepage water drainage pump is installed on an emergency drainage pipeline, one end of the emergency drainage pipeline is connected with the energy storage pool, and the other end is connected with a municipal rainwater system.

[0022] The end of the emergency drainage pipeline connected with the energy storage pool is provided with two upper and lower drainage openings, and the upper ends of the two drainage openings are provided with control valves.

[0023] As a further implementation, a seepage water collection and lifting system is further included, one end of the seepage water collection and lifting system is connected with the water collecting gutter, and the other end is connected with the seepage main pipe and the municipal rainwater system.

[0024] As a further implementation, the seepage water collection and lifting system includes a water collecting pool, the inside of the water collecting pool is provided with a first seepage water lifting pump, and the first seepage water lifting pump is installed at one end of a first pipeline.

[0025] As a further implementation, the other end of the first pipeline is connected with a water lifting pool, the inside of the water lifting pool is provided with a second seepage water lifting pump, the second seepage water lifting pump is installed at one end of a second pipeline, and the other end of the second pipeline is connected with the seepage main pipe and the municipal rainwater system through a third pipeline and a fourth pipeline respectively.

[0026] The second aspect of the present disclosure provides a tunnel seepage water energy utilization method based on a flexible heat exchanger, comprising:

[0027] The operation strategy in summer is as follows: when the water level in the energy storage pool does not exceed the safe water level, open the valves on all the downward seepage water distribution pipes and the valves on the upward overflow water main pipe, and close the valves on all the upward seepage water distribution pipes and the valves on the downward overflow water main pipe.

[0028] The seepage water with lower temperature enters each sub-space of the energy storage pool, exchanges heat with the flexible heat exchanger, and then rises to the surface of the energy storage pool due to the increase of temperature and the decrease of density, flows into the upward overflow water collecting pipe through the upward overflow water branch pipe, and is discharged to the municipal rainwater system through the upward overflow water main pipe and the overflow water main pipe.

[0029] When the water level in the energy storage pool exceeds the safe water level, the seepage water is discharged to the municipal rainwater system through the emergency drainage pipeline by simultaneously opening the valves on the seepage water drainage pump and the upward drainage opening and closing the valve on the downward drainage opening.

[0030] The operation strategy in winter is as follows: when the water level in the energy storage pool does not exceed the safe water level, open the valves on all the upward seepage water distribution pipes and the valves on the downward overflow water main pipe, and close the valves on all the downward seepage water distribution pipes and the valves on the upward overflow water main pipe.

[0031] The seepage water with higher temperature enters each sub-space of the energy storage pool, exchanges heat with the flexible heat exchanger, and then drops to the bottom of the energy storage pool due to the decrease of temperature and the increase of density, flows into the downward overflow water collecting pipe through the downward overflow water branch pipe, and is discharged to the municipal rainwater system through the downward overflow water main pipe and the overflow water main pipe.

[0032] When the water level in the energy storage pool exceeds the safe water level, the seepage water drainage pump and the valve on the lower drainage outlet are opened, and the valve on the upper drainage outlet is closed, so that the seepage water is discharged to the municipal rainwater system through the emergency drainage pipeline.

[0033] Compared with the prior art, the present disclosure has the following beneficial effects:

[0034] The tunnel seepage water energy utilization system and method based on the flexible heat exchanger provided by the present disclosure can uniformly distribute high-temperature (in winter) or low-temperature (in summer) seepage water to each heat exchange space, ensure the uniform temperature of the pool, and improve the heat exchange efficiency of the heat exchanger. Each sub-space is provided with a flexible heat exchanger, the bottom of the flexible pipe is fixed on a channel steel, and the bottom pipeline of the capillary tube is bound firmly through the channel iron hole by a strap. The same type connection mode is used between different flexible heat exchangers to maintain the balance of the hydraulic system, and the space of the energy storage pool can be fully utilized.

[0035] The tunnel seepage water energy utilization system and method based on the flexible heat exchanger provided by the present disclosure, the seepage water pipe system and the overflow water pipe system each include an upper system and a lower system, the upper seepage water pipe system and the lower overflow water pipe system are opened in matching when the heat in the seepage water needs to be extracted. The lower seepage water pipe system and the upper overflow water pipe system are opened in matching when the cold energy in the seepage water needs to be extracted. According to different seasons and different cold and heat sources required by the building terminal equipment, different matching systems are opened to utilize the cold or heat energy contained in the seepage water. The energy contained in the tunnel seepage water is fully utilized to provide cold or heat for the building terminal, which is environmentally friendly, economical, practical, high in heat exchange efficiency, and long in service life.

[0036] The tunnel seepage water energy utilization system and method based on the flexible heat exchanger provided by the present disclosure considers the case that the vertical distance between the tunnel bottom and the ground is large, and is provided with a seepage water collection and lifting system for further lifting of the seepage water, improving the performance of the seepage water energy utilization system, and facilitating the use of the seepage water energy utilization system. The number of the seepage water collection and lifting system depends on the size of the vertical height difference, and the seepage water collection and lifting system can also be combined with the tunnel air shaft.

[0037] The advantages of the additional aspects of the present application will be partially given in the following description, partially will become obvious from the following description, or will be known by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0038] The drawings accompanying the specification of the present disclosure serve to provide further understanding of the present disclosure, and the illustrative embodiments of the present disclosure and the description thereof are used to explain the present disclosure, and do not constitute improper limitations on the present disclosure.

[0039] Fig. 1 is a schematic diagram of the overall structure of a tunnel seepage water energy utilization system based on flexible heat exchangers according to the present disclosure;

[0040] Fig. 2 is a schematic diagram of the structure of a seepage water pipe system, an overflow water pipe system and an energy storage pool according to the present disclosure;

[0041] Fig. 3 is a schematic diagram of the structure of a flexible heat exchanger according to the present disclosure;

[0042] Fig. 4 is a schematic diagram of the structure of a one-way tunnel seepage water energy utilization system according to the present disclosure.

[0043] In the figure, 1 is an overflow water main pipe; 2 is a valve; 3 is a lower overflow water main pipe; 4 is an upper overflow water main pipe; 5 is a lower overflow water collecting pipe; 6 is an upper overflow water collecting pipe; 7 is a lower overflow water branch pipe; 8 is an upper overflow water branch pipe; 9 is a seepage water main pipe; 10 is a seepage water branch pipe; 11 is an upper seepage water distribution pipe; 12 is a lower seepage water distribution pipe; 13 is an emergency drainage pipe; 14 is a seepage water drainage pump; 15 is an upper drainage outlet; 16 is a lower drainage outlet; 17 is a backwater pipe; 18 is a water supply pipe; 19 is a water collecting pool; 20 is a first seepage water lifting pump; 21 is a first pipe; 22 is a second seepage water lifting pump; 23 is a second pipe; 24 is a third pipe; 25 is a fourth pipe; 26 is a lifting water pool; 27 is a water collecting open ditch; 28 is seepage water; 29 is a tunnel; 30 is an energy storage pool; 31 is a backwater branch pipe; 32 is a water supply branch pipe; 33 is a flexible thin pipe; and 34 is a horizontal collecting pipe. DETAILED DESCRIPTION

[0044] The present disclosure will be further described below in conjunction with the accompanying drawings and examples.

[0045] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present disclosure. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs.

[0046] The embodiments in the present disclosure and the features in the embodiments can be combined with each other as long as there is no conflict.

[0047] Embodiment One

[0048] As shown in Fig. 2, the tunnel seepage water energy utilization system based on flexible heat exchangers according to the present embodiment one comprises a seepage water pipe system, an overflow water pipe system and an energy storage pool. The inside of the energy storage pool is partitioned into a plurality of subspaces which are interconnected, and each subspace is provided with a flexible heat exchanger. Tunnel seepage water enters each subspace of the energy storage pool through the seepage water pipe system, exchanges heat with the flexible heat exchanger and is discharged through the overflow water pipe system.

[0049] The seepage water pipe system and the overflow water pipe system each include upper and lower systems, and only one of the upper and lower systems can be opened, and cannot be opened simultaneously. When heat in the seepage water needs to be extracted, the upper seepage water pipe system and the lower overflow water pipe system are opened in coordination. When cold in the seepage water needs to be extracted, the lower seepage water pipe system and the upper overflow water pipe system are opened in coordination. According to different seasons, different cold and heat sources are required by the building terminal equipment, and different coordinated systems are opened to utilize the cold or heat energy contained in the seepage water.

[0050] The seepage water pipe system includes a seepage water main pipe and seepage water branch pipes, one end of the seepage water branch pipes is in communication with the seepage water main pipe, and the other end is in communication with upper and lower seepage water distribution pipes, respectively. The seepage water main pipe, the seepage water branch pipes and the upper seepage water distribution pipe constitute an upper seepage water pipe system, and the seepage water main pipe, the seepage water branch pipes and the lower seepage water distribution pipe constitute a lower seepage water pipe system. Control valves are installed on the upper and lower seepage water distribution pipes, facilitating the opening and closing of the upper and lower seepage water pipe systems. The number of seepage water branch pipes is adapted to the number of subspaces in the energy storage pool, so as to distribute the seepage water to each subspace of the energy storage pool.

[0051] The overflow water pipe system includes an overflow water main pipe, and the overflow water main pipe is in communication with an upper overflow water pipe system and a lower overflow water pipe system, respectively. The pipe connection structures of the upper and lower overflow water pipe systems are the same, and the specific structure is as follows:

[0052] The upper / lower overflow water pipe system includes an upper / lower overflow water main pipe, and the upper / lower overflow water main pipe is in communication with an upper / lower overflow water header, the upper / lower overflow water header is in communication with a plurality of upper / lower overflow water branch pipes, and the upper / lower overflow water branch pipes are in communication with each subspace of the energy storage pool, so as to discharge the seepage water in each subspace from the energy storage pool after heat exchange. Control valves are installed on the upper / lower overflow water main pipes, facilitating the opening and closing of the upper and lower overflow water pipe systems. The valves installed on the upper / lower overflow water main pipes have the functions of electrically adjusting and detecting the state, and only one can be opened at any time.

[0053] When the lower overflow water main pipe is connected with the upper overflow water main pipe, the connection point is arranged at the upper part outside the energy storage pool, so that drainage is only performed when the water level exceeds the drainage upper limit water level of the energy storage pool.

[0054] After the seepage water exchanges heat in the energy storage pool, the seepage water is mainly discharged through the upper overflow water branch pipe or the lower overflow water branch pipe, and is collected into the upper overflow water header or the lower overflow water header, respectively. The upper overflow water header is finally connected to the upper overflow water main pipe. The lower overflow water header is finally connected to the lower overflow water main pipe. The upper overflow water main pipe and the lower overflow main pipe are connected in parallel to the overflow main pipe. The upper / lower overflow water branch pipe, the upper / lower overflow water header, the upper / lower overflow water main pipe and the overflow water main pipe are all provided with a slope along the water flow direction, and the slope is not less than 0.005.

[0055] The upper and lower seepage water distribution pipes of the present disclosure are both provided with control valves, overflow water branch pipes are arranged at the upper and lower parts of each partition of the energy storage pool, and the pipe diameter of the overflow water branch pipe is larger than that of the seepage water distribution pipe. The high and low settings of the seepage water distribution pipe and the overflow water branch pipe can ensure that the water with high / low temperature in the pool is discharged in summer / winter, improve the heat exchange efficiency of the flexible heat exchanger and the system, and avoid energy short circuit of the inlet and outlet water. The energy storage pool of the present disclosure mainly discharges water through the arranged multiple overflow water branch pipes without power, which can reduce the energy consumption of the water pump.

[0056] Through the above structural design, the entire energy storage pool is divided into each sub-space by the partition, but each sub-space is still in communication. The tunnel seepage water enters the energy storage pool through the seepage water main pipe, and is distributed to each sub-space of the energy storage pool through each seepage water branch pipe. The arrangement of the partition and the seepage water distribution pipe can uniformly distribute the seepage water with high temperature (in winter) or low temperature (in summer) to each heat exchange space, ensure the uniform temperature of the pool, and improve the heat exchange efficiency of the heat exchanger.

[0057] As shown in FIG. 3, in the present embodiment, the flexible heat exchanger includes a water supply branch pipe and a return water branch pipe, and the water supply branch pipe and the return water branch pipe are connected in communication through multiple pipe seats composed of parallel flexible pipes. The water supply branch pipe and the return water branch pipe are connected in communication with the water supply pipe and the return water pipe, respectively.

[0058] The flexible heat exchanger is composed of flexible pipes with an outer diameter of 4.3 mm and a pipe wall thickness of 0.85 mm, which are connected in parallel to the upper and lower horizontal headers by hot melting, to form pipe seats. Different horizontal headers of different pipe seats are connected to the water supply branch pipe and the return water branch pipe by hot melting.

[0059] The bottom of the flexible pipe is fixed on a channel steel, and a flat iron with holes is welded on the channel steel. The bottom pipeline of the capillary tube is bound firmly by passing through the flat iron hole with a strap. The same type of connection method is used between different flexible heat exchangers to maintain the hydraulic system balance. The flexible heat exchanger is installed in a suspended manner and is hung on the top of the energy storage pool. By using the flexible heat exchanger, the space of the energy storage pool can be fully utilized, and the flexible heat exchanger is made of PPR or PE-RT material, which can prevent corrosion of the seepage water. The fluid after heat exchange by the flexible heat exchanger can directly enter the condenser (in summer) or the evaporator (in winter) of the heat pump system to provide a cold source or a heat source for the heat pump unit. When the water temperature meets the user's demand, the water after heat exchange by the flexible heat exchanger can be directly used for cooling or heating.

[0060] The heat exchange medium (mainly water) in the flexible heat exchanger enters the flexible heat exchanger through the water supply pipe to exchange heat with the seepage water, and the heat exchange medium after heat exchange returns to the unit through the return water pipe.

[0061] The seepage water drainage pump is installed on an emergency drainage pipeline, one end of the emergency drainage pipeline is connected with the energy storage pool, and the other end is connected with a municipal rainwater system. The end of the emergency drainage pipeline connected with the energy storage pool is provided with two upper and lower drainage ports, and the two drainage ports are each provided with a control valve. When the seepage water is too large, the water level in the energy storage pool exceeds a safe liquid level, the seepage water can be quickly removed through the emergency drainage pipeline by starting the seepage water drainage pump, the liquid level of the energy storage pool is reduced, and the safety of the tunnel is ensured.

[0062] As shown in FIG. 1, the tunnel seepage water energy utilization system further comprises a seepage water collection and lifting system, one end of the seepage water collection and lifting system is connected with the water collecting open ditch, and the other end is connected with the seepage main pipe and the municipal rainwater system.

[0063] The seepage water collection and lifting system comprises a water collecting pool, a first seepage water lifting pump is arranged in the water collecting pool, and the first seepage water lifting pump is installed at one end of a first pipeline.

[0064] The other end of the first pipeline is connected with a water lifting pool, a second seepage water lifting pump is arranged in the water lifting pool, the second seepage water lifting pump is installed at one end of a second pipeline, and the other end of the second pipeline is connected with the seepage main pipe and the municipal rainwater system through a third pipeline and a fourth pipeline respectively.

[0065] The seepage water is mainly collected through the water collecting open ditch under the tunnel side wall and is collected to the water collecting pool arranged at the bottom of the tunnel at the lowest point. The seepage water in the water collecting pool at the bottom of the tunnel is lifted through the first seepage water lifting pump at the bottom of the tunnel, enters the water lifting pool through the valve and the first pipeline, the seepage water in the water lifting pool is lifted through the second seepage water lifting pump, and is connected with the energy storage pool through the valve, the second pipeline and the third pipeline. At this time, the valve on the fourth pipeline is closed. When the seepage water is large, the valves on the third and fourth pipelines are opened at the same time, and the excessive seepage water is directly discharged to the municipal rainwater system through the fourth pipeline.

[0066] The setting of the water lifting pool and the second seepage water lifting pump in the present disclosure is considered in the case that the vertical distance between the bottom of the tunnel and the ground is large, and is used for further lifting of the seepage water, and the number of settings depends on the size of the vertical height difference, and the water lifting pool and the second seepage water lifting pump can also be combined with the tunnel air shaft.

[0067] The first seepage water lifting pump, the second seepage water lifting pump and the seepage water drainage pump in the present disclosure are all provided with standby pumps, the standby pumps are not started under normal circumstances, and the standby pumps are started at the same time when another pump fails or the seepage water is too large.

[0068] The present disclosure can be a bidirectional tunnel seepage water energy utilization system, as shown in FIG. 1, the system structure and operation mode on the left and right sides are the same. The bidirectional system can ensure the safety of the tunnel and prevent the system from failing in a certain direction. When there is no terminal cold / heat load in a certain direction, as shown in FIG. 4, the energy storage pool and the flexible heat exchanger can not be set, and the seepage water directly discharges the tunnel bottom seepage water to the municipal rainwater pipe network.

[0069] The technical solutions of the present application are described below with two specific examples.

[0070] Case 1:

[0071] A certain submarine subway tunnel is about 8.1 km long, and the deepest part of the tunnel is 88 m away from sea level. The seepage water of the tunnel is about 1200 m3 / d, the average temperature of the seepage water in summer is about 23℃, and the average temperature of the seepage water in winter is about 15℃. Subway stations are set at both ends of the tunnel, and the subway stations have the demand for cooling and heating, and the cold and heat source load is about 5MW. Therefore, by using the flexible heat exchanger system of tunnel seepage water, a bidirectional seepage water energy utilization system is set up. Due to the relatively large difference in height between the bottom of the tunnel and the sea level, one intermediate lifting pool is set up in combination with the air shaft, the volume of the energy storage pool is set to 1500 m3, the number of partitions is 14, the volume of the capillary tube is 1200 m3, the area of the capillary tube is about 12000 m2, and about 6MW of energy can be provided in winter and summer, which can meet the cooling and heating demand of the system.

[0072] Case 2:

[0073] A certain river-crossing tunnel is about 3 km long, and the deepest part of the tunnel is about 30 m away from the water surface. The seepage water of the tunnel is about 2400 m3 / d, the average temperature of the seepage water in summer is about 25℃, and the average temperature of the seepage water in winter is about 17℃. A data center is set at one end of the tunnel, and there is no cold and heat load at the other end. Therefore, by using the flexible heat exchanger system of tunnel seepage water, a unidirectional seepage water energy utilization system is set up at the data center end, and a standby path is set up at the other end, and the seepage water is directly discharged to the municipal rainwater pipe after being lifted, as shown in FIG. 4. Under normal working conditions, only the seepage water energy utilization system at the data end is operated, and when it fails, the standby path is opened to ensure the safe operation of the system. Since the difference in height between the bottom of the tunnel and the sea level is relatively small, a unidirectional intermediate lifting pool can not be set.

[0074] The data center needs refrigeration all year round, so the cold water after heat exchange by the flexible heat exchanger is directly used for the data center in winter. In other seasons, when the water temperature can meet the refrigeration demand, it can also be directly introduced into the refrigeration room for refrigeration, and when it does not meet the requirement, it is introduced into the evaporator of the cold machine or heat pump for further refrigeration.

[0075] Example Two

[0076] The second embodiment of the present disclosure provides a tunnel seepage water energy utilization method based on a flexible heat exchanger, comprising:

[0077] The operation strategy in summer is as follows: when the water level in the energy storage pool does not exceed the safe water level, open the valves on all the downward seepage water distribution pipes and the valve on the upward overflow water main, close the valves on all the upward seepage water distribution pipes and the valve on the downward overflow water main;

[0078] The seepage water with lower temperature enters each subspace of the energy storage pool, exchanges heat with the flexible heat exchanger, and then rises to the surface of the energy storage pool due to the increased temperature and decreased density, flows into the upward overflow water header through the upward overflow water branch pipe, is collected in the upward overflow water header, and is discharged to the municipal rainwater system through the upward overflow water main and the overflow water main;

[0079] When the water level in the energy storage pool exceeds the safe water level, the seepage water discharge pump and the valve on the upward discharge outlet are opened, and the valve on the downward discharge outlet is closed, so that the seepage water is discharged to the municipal rainwater system through the emergency drainage pipeline;

[0080] The operation strategy in winter is as follows: when the water level in the energy storage pool does not exceed the safe water level, open the valves on all the upward seepage water distribution pipes and the valve on the downward overflow water main, close the valves on all the downward seepage water distribution pipes and the valve on the upward overflow water main;

[0081] The seepage water with higher temperature enters each subspace of the energy storage pool, exchanges heat with the flexible heat exchanger, and then drops to the bottom of the energy storage pool due to the decreased temperature and increased density, flows into the downward overflow water header through the downward overflow water branch pipe, is collected in the downward overflow water header, and is discharged to the municipal rainwater system through the downward overflow water main and the overflow water main;

[0082] When the water level in the energy storage pool exceeds the safe water level, the seepage water discharge pump and the valve on the downward discharge outlet are opened, and the valve on the upward discharge outlet is closed, so that the seepage water is discharged to the municipal rainwater system through the emergency drainage pipeline.

[0083] The more detailed steps are the same as those in the first embodiment, and will not be described here.

[0084] The above only describes the preferred embodiments of the present disclosure and is not used to limit the present disclosure. For those skilled in the art, the present disclosure can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A tunnel seepage water energy utilization system based on a flexible heat exchanger, characterized in that, The system comprises a seepage water pipe system, an overflow water pipe system and an energy storage pool. The energy storage pool is divided into multiple subspaces which are connected with each other, and each subspace is provided with a flexible heat exchanger. The seepage water pipe system and the overflow water pipe system each comprise two systems, and the upper seepage water pipe system is matched with the lower overflow water pipe system, and the lower seepage water pipe system is matched with the upper overflow water pipe system. The tunnel seepage water enters the subspaces of the energy storage pool through the seepage water pipe system, exchanges heat with the flexible heat exchanger, and is discharged through the overflow water pipe system.

2. The tunnel seepage water energy utilization system based on the flexible heat exchanger according to claim 1, characterized in that, The flexible heat exchanger comprises water supply branch pipes and return water branch pipes, and the water supply branch pipes and the return water branch pipes are connected through multiple pipe seats composed of parallel flexible fine pipes.

3. The tunnel seepage water energy utilization system based on the flexible heat exchanger according to claim 1, characterized in that, The seepage water pipe system comprises a seepage water main pipe and seepage water branch pipes, one end of the seepage water branch pipes is connected with the seepage water main pipe, and the other end is connected with two seepage water distribution pipes. The two seepage water distribution pipes are each provided with a control valve. The number of the seepage water branch pipes is matched with the number of the subspaces in the energy storage pool.

4. The tunnel seepage water energy utilization system based on the flexible heat exchanger according to claim 1, characterized in that, The overflow water pipe system comprises an overflow water main pipe, and the overflow water main pipe is connected with the upper overflow water pipe system and the lower overflow water pipe system.

5. The tunnel seepage water energy utilization system based on the flexible heat exchanger according to claim 4, characterized in that, The upper overflow water pipe system comprises an upper overflow water main pipe, the upper overflow water main pipe is connected with an upper overflow water header, the upper overflow water header is connected with multiple upper overflow water branch pipes, and the upper overflow water branch pipes are connected with the subspaces of the energy storage pool. The upper overflow water main pipe is provided with a control valve.

6. The tunnel seepage water energy utilization system based on the flexible heat exchanger according to claim 1, characterized in that, The energy storage pool is further provided with a seepage water drainage pump, the seepage water drainage pump is installed on an emergency drainage pipeline, one end of the emergency drainage pipeline is connected with the energy storage pool, and the other end is connected with a municipal rainwater system. The emergency drainage pipeline is provided with two drainage openings at the end connected with the energy storage pool, and each of the two drainage openings is provided with a control valve.

7. The tunnel seepage water energy utilization system based on the flexible heat exchanger according to claim 1, characterized in that, The system further comprises a seepage water collection and lifting system, one end of the seepage water collection and lifting system is connected with a catchment ditch, and the other end is connected with a seepage water main pipe and a municipal rainwater system.

8. The tunnel seepage water energy utilization system based on the flexible heat exchanger according to claim 7, characterized in that, The seepage water collection and lifting system comprises a catchment pool, the catchment pool is provided with a first seepage water lifting pump inside, and the first seepage water lifting pump is installed at one end of a first pipeline.

9. The tunnel seepage water energy utilization system based on the flexible heat exchanger according to claim 8, characterized in that, The other end of the first pipeline is connected with a lifting pool, the lifting pool is provided with a second seepage water lifting pump inside, the second seepage water lifting pump is installed at one end of a second pipeline, and the other end of the second pipeline is connected with a seepage water main pipe and a municipal rainwater system through a third pipeline and a fourth pipeline.

10. A tunnel seepage water energy utilization method based on a flexible heat exchanger, characterized in that, the operation strategy in summer is as follows: when the water level in the energy storage pool does not exceed the safe water level, open the valves on all the lower seepage water distribution pipes and the valves on the upper overflow water main pipe, and close the valves on all the upper seepage water distribution pipes and the valves on the lower overflow water main pipe. The seepage water with low temperature enters each sub-space of the energy storage pool, exchanges heat with the flexible heat exchanger, and then rises to the surface of the energy storage pool after the temperature is increased and the density is decreased. The seepage water flows into the upper overflow water collecting pipe through the upper overflow water branch pipe, is collected in the upper overflow water collecting pipe, and is discharged to the municipal rainwater system through the upper overflow water main pipe and the overflow water main pipe; When the water level in the energy storage pool exceeds the safe water level, the seepage water pump and the valve on the lower water outlet are opened, and the valve on the upper water outlet is closed. The seepage water is discharged to the municipal rainwater system through the emergency drainage pipeline. The operation strategy in winter is as follows: when the water level in the energy storage pool does not exceed the safe water level, the valves on all the upper seepage water distribution pipes and the valve on the lower overflow water main pipe are opened, and the valves on all the lower seepage water distribution pipes and the valve on the upper overflow water main pipe are closed. The seepage water with high temperature enters each sub-space of the energy storage pool, exchanges heat with the flexible heat exchanger, and then falls to the bottom of the energy storage pool after the temperature is decreased and the density is increased. The seepage water flows into the lower overflow water collecting pipe through the lower overflow water branch pipe, is collected in the lower overflow water collecting pipe, and is discharged to the municipal rainwater system through the lower overflow water main pipe and the overflow water main pipe; When the water level in the energy storage pool exceeds the safe water level, the seepage water pump and the valve on the lower water outlet are opened, and the valve on the upper water outlet is closed. The seepage water is discharged to the municipal rainwater system through the emergency drainage pipeline.

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