Efficient heat exchange device for rock-soil energy storage and cyclic utilization

Abstract

The utility model discloses an efficient heat exchange device for rock-soil energy storage cyclic utilization, and relates to the technical field of heat exchange devices, the efficient heat exchange device comprises an outer pipe and an inner pipe sleeved in the outer pipe, the outer ring surface of the inner pipe is provided with an inner baffle ring, the inner baffle ring is internally provided with a turbulent flow hole channel communicated with the inner wall of the inner pipe, and the turbulent flow hole channel is communicated with the inner wall of the inner pipe. An inner baffle ring is connected to the inner ring face of the outer pipe, the inner baffle ring and the outer baffle ring are located on the same plane, a baffle net is connected to the outer ring face of the outer pipe, and a heat exchange cavity is formed between the baffle net and the outer baffle ring. According to the efficient heat exchange device for rock-soil energy storage cyclic utilization, the passing area of a heat exchange medium can be reduced, the heat exchange efficiency can be improved, meanwhile, the heat exchange medium in the inner pipe can return to the outer pipe from the turbulent flow hole channels, the heat exchange medium can be disturbed, the laminar flow state of the heat exchange medium is destroyed, and the heat exchange efficiency is improved. And the heat exchange effect of the heat exchange medium and the high-temperature rock stratum is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange devices, and more specifically to a high-efficiency heat exchange device for recycling rock and soil energy storage. Background Art

[0002] A heat exchange geothermal well is a system that uses underground heat energy for heat exchange. It is mainly used for the development and utilization of geothermal energy, especially in the fields of heating, hot water supply and power generation. This type of geothermal well is designed to extract heat from underground reservoirs efficiently and sustainably while reducing the impact on the environment. The types of geothermal energy currently developed and utilized are mainly divided into shallow geothermal energy, middle geothermal energy and deep geothermal energy. In the utilization of geothermal resources, the buried pipe system has the advantages of not being restricted by groundwater resources, no pollution to the environment, not being affected by external factors such as seasons and climate, and good system stability.

[0003] The Chinese patent application number is 201721267485.6, which discloses a heat exchanger in a geothermal well, the structure of which includes an outer casing, an inner casing, an upper cementing section cementing layer and a lower cementing section cementing layer; the inner casing is placed in the outer casing, and the lower end of the inner casing is higher than the lower end of the outer casing; an annular space is formed between the outer wall of the inner casing and the inner wall of the outer casing; the upper end of the outer casing is used to connect the circulating medium inflow pipeline; the upper end of the inner casing is used to connect the circulating medium outflow pipeline; the upper wall of the outer casing is wrapped with the cementing layer of the upper cementing section; the outer wall of the lower casing and the lower end are wrapped with the cementing layer of the lower cementing section; the thermal conductivity of the cementing layer of the upper cementing section is less than the thermal conductivity of the cementing layer of the lower cementing section. The heat exchanger in the geothermal well increases the heat exchange efficiency between the heat exchange medium in the pipeline and the high-temperature rock layer by improving the thermal conductivity of the cementing layer. However, the heat exchange medium in the outer pipe is in a laminar state when flowing to the bottom, that is, the water in the outer layer does not mix with the water in the inner layer. When entering the high-temperature rock layer for heat exchange, the ability of the inner layer water to exchange heat with the high-temperature rock layer is limited, which will cause a temperature difference between the inner and outer layers of water, thereby reducing the heat exchange efficiency. At the same time, the inner pipe is sleeved in the outer pipe, which is prone to shaking.

[0004] Therefore, it is necessary to propose an efficient heat exchange device for geotechnical energy storage and recycling to solve the above problems. Utility Model Content

[0005] In view of the above problems, the utility model provides a high-efficiency heat exchange device for rock and soil energy storage and recycling; it has the function of breaking the internal and external laminar flow state, improving the heat exchange efficiency, and at the same time, improving the supporting capacity of the inner pipe.

[0006] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0007] A high-efficiency heat exchange device for geotechnical energy storage and recycling, comprising an outer tube and an inner tube sleeved inside the outer tube, an inner baffle ring is arranged on the outer annular surface of the inner tube, a flow disturbance channel connected to the inner wall of the inner tube is opened inside the inner baffle ring, an outer baffle ring is connected to the inner annular surface of the outer tube, the inner baffle ring and the outer baffle ring are located on the same plane, a baffle net is connected to the outer annular surface of the outer tube, and a heat exchange cavity is formed between the baffle net and the outer baffle ring;

[0008] The heat exchange cavity includes an inner cavity and an outer cavity, the inner cavity is located on a side close to the outer baffle ring, a partition plate is arranged between the inner cavity and the outer cavity, a convex ring portion is arranged on the partition plate, a heat conductive ring is arranged inside the convex ring portion, a heat conductive plate is connected to the outer ring surface of the heat conductive ring, a heat exchange plate is connected to the heat conductive plate, the heat exchange plate is located in the outer cavity, and the inner cavity is filled with heat conductive liquid.

[0009] Preferably, the flow-disturbing channel includes a water inlet and a water outlet, the water inlet is curved, one end of the water outlet away from the inner tube is arranged toward the bottom of the inner tube, one end of the water inlet close to the axis is arranged toward the bottom of the inner tube, and the other end of the water outlet is connected to the water inlet.

[0010] Preferably, a spoiler tube is provided in the water outlet, and a spiral water-guiding convex pattern is provided on the inner wall of the spoiler tube.

[0011] Preferably, a support frame is connected between the inner tube and the outer tube, the support frame includes an inner ring, an outer ring and a support rod, the support rod is connected between the inner ring and the outer ring, shaking grooves are opened on both sides of the support rod, and a shaking plate is rotatably connected in the shaking groove.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The device is provided with inner and outer baffle ring components, which can reduce the area through which the heat exchange medium passes, reduce the pressure of the heat exchange medium, and improve the efficiency of heat exchange. At the same time, the heat exchange medium in the inner tube can return to the outer tube from the turbulent channel, which has the effect of disturbing the heat exchange medium, destroying the laminar flow state of the heat exchange medium, and improving the heat exchange effect between the heat exchange medium and the high-temperature rock formation.

[0014] 2. The device is provided with a support frame component, which can support the inner tube. At the same time, the shaking plate on the outer wall can guide the heat exchange medium and enhance the disturbing effect on the water body.

[0015] 3. The device is provided with a flow disturbance pipe in the flow disturbance channel. When the heat exchange medium passes through the flow disturbance pipe, it will be affected by the water-guiding convex patterns on the inner wall, and thus flow out in a rotating manner, thereby enhancing the disturbing effect on the heat exchange medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an overall schematic diagram of the structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the structure of the inner retaining ring and the outer retaining ring in the utility model;

[0018] Figure 3 It is a schematic diagram of the structure of the partition plate and the convex ring portion in the utility model;

[0019] Figure 4 It is a schematic diagram of the spoiler channel structure in the utility model;

[0020] Figure 5 It is a schematic diagram of the support frame structure in the utility model.

[0021] Reference numerals:

[0022] 101. Outer tube; 102. Inner tube; 103. Inner retaining ring; 104. Turbine channel; 105. Outer retaining ring; 106. Retaining net; 107. Inner cavity; 108. Outer cavity; 109. Partition plate; 110. Raised ring; 111. Heat transfer ring; 112. Heat transfer plate; 113. Heat exchange plate; 114. Water inlet; 115. Water outlet; 116. Turbine; 117. Water guide convex pattern; 118. Support frame; 119. Inner ring; 120. Outer ring; 121. Support rod; 122. Shaking groove; 123. Shaking plate. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-5A high-efficiency heat exchange device for geotechnical energy storage and recycling comprises an outer tube 101 and an inner tube 102 sleeved inside the outer tube 101. The outer tube 101 and the inner tube 102 are filled with a heat exchange medium. The heat exchange medium moves from the area between the inner tube 102 and the outer tube 101 to the high-temperature rock layer at the bottom. After exchanging heat with the high-temperature rock layer, the heat exchange medium returns to the surface heat exchange station from the inner tube 102. The outer tube 101 is sleeved with a filler, and the outer ring surface of the inner tube 102 is provided with an inner retaining ring 103. The inner retaining ring 103 is provided with a flow disturbance channel 104 connected to the inner wall of the inner tube 102. The flow disturbance channel 104 is connected between the inner tube 102 and the outer tube 101. The inner An outer baffle ring 105 is connected to the annular surface, and the inner baffle ring 103 and the outer baffle ring 105 are located on the same plane. The inner baffle ring 103 and the outer baffle ring 105 reduce the area that can pass through here. According to the Venturi effect, the flow rate will increase. At the same time, the heat exchange medium in the inner tube 102 will also return to the area between the outer tube 101 and the inner tube 102 through the turbulent channel 104, and disrupt the heat exchange medium flowing downward, breaking the inner and outer laminar flow state of the heat exchange medium. A baffle net 106 is connected to the outer annular surface of the outer tube 101. The baffle net 106 has a protective effect and plays a protective role on the heat exchange plate 113. A heat exchange cavity is formed between the baffle net 106 and the outer baffle ring 105;

[0025] When the heat exchange medium passes through the neck, the flow rate will increase, causing the pressure at that point to drop. The lower pressure helps to improve the efficiency of heat energy transfer because the temperature difference between the heat exchange medium and the pipe wall increases, which promotes the heat exchange process.

[0026] The heat exchange chamber includes an inner chamber 107 and an outer chamber 108. The inner chamber 107 is located on a side close to the outer retaining ring 105. A partition plate 109 is provided between the inner chamber 107 and the outer chamber 108. The inner chamber 107 is filled with a heat-conducting liquid, and the heat-conducting liquid exchanges heat with the heat exchange medium in the outer tube 101. The outer chamber 108 is used to accommodate high-temperature water in the geothermal layer. The high-temperature water transfers heat to the heat-conducting liquid through the partition plate 109, so that the heat-conducting liquid and the heat exchange medium can exchange heat. At the same time, the high-temperature water transfers heat through the heat exchange plate 113. A heat-conducting ring 111 is provided, and the heat-conducting ring 111 is located in the convex ring portion 110. It can transfer heat to the heat exchange liquid from the inside. By injecting liquid into the space between the outer tube 101 and the filler, the outer cavity 108 contains high-temperature water. The partition plate 109 is provided with a convex ring portion 110, and the interior of the convex ring portion 110 is provided with a heat-conducting ring 111. A heat-conducting plate 112 is connected to the outer ring surface of the heat-conducting ring 111, and a heat exchange plate 113 is connected to the heat conduction plate 112. The heat exchange plate 113 is located in the outer cavity 108, and the inner cavity 107 is filled with heat-conducting liquid.

[0027] Specifically, the turbulent flow channel 104 includes a water inlet 114 and a water outlet 115. The water inlet 114 is bent. When the heat exchange medium flows upward through the inner tube 102, based on the Venturi effect, part of the heat exchange medium will enter the outer tube 101 through the turbulent flow channel 104, thereby disrupting the heat exchange medium flowing in the outer tube 101. The end of the water outlet 115 away from the inner tube 102 is arranged toward the bottom of the inner tube 102. The water outlet 115 has the same flow direction as the heat exchange medium in the outer tube 101. The end of the water inlet 114 close to the axis is arranged toward the bottom of the inner tube 102, and the other end of the water outlet 115 is connected to the water inlet 114.

[0028] Specifically, a spoiler tube 116 is provided in the water outlet 115, and a spiral water-guiding convex pattern 117 is provided on the inner wall of the spoiler tube 116. When the heat exchange medium passes through the spoiler tube 116, it will be affected by the water-guiding convex pattern 117, thereby generating rotation, thereby enhancing the disturbing effect on the heat exchange medium.

[0029] Specifically, a support frame 118 is connected between the inner tube 102 and the outer tube 101. The support frame 118 has the function of supporting the inner tube 102. At the same time, the shaking plate 123 on the top has the function of guiding the heat-conducting medium. The shaking plate 123 can shake in the shaking groove 122 following the impact of the water flow, thereby disturbing the water flow. The support frame 118 includes an inner ring 119, an outer ring 120 and a support rod 121. The support rod 121 is connected between the inner ring 119 and the outer ring 120. Shaking grooves 122 are opened on both sides of the support rod 121, and a shaking plate 123 is rotatably connected in the shaking groove 122.

[0030] In this embodiment, the inner tube 102 is sleeved in the outer tube 101, and a filler is arranged between the outer tube 101 and the high-temperature rock formation. The heat exchange medium enters from the outer tube 101 and then returns to the surface heat exchange station from the inner tube 102. When the heat exchange medium passes between the inner baffle ring 103 and the outer baffle ring 105, the area that can be passed is reduced, so that the flow rate of the heat exchange medium increases, the pressure at this point decreases, and the temperature difference between the heat exchange medium and the pipeline wall increases, which promotes the heat exchange process. At the same time, according to the Venturi effect, the heat exchange medium in the inner tube 102 will enter the outer tube 101 from the turbulent channel 104, which will disrupt the flowing heat exchange medium and destroy the state of the inner and outer laminar flow of the heat exchange medium, so that the inner layer of the heat exchange medium can also pass through the wall of the outer tube 101 to exchange heat with the high-temperature rock formation.

[0031] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A high-efficiency heat exchange device for geotechnical energy storage and recycling, comprising an outer tube (101) and an inner tube (102) sleeved inside the outer tube (101), characterized in that: An inner baffle ring (103) is arranged on the outer annular surface of the inner tube (102); a flow disturbance channel (104) is provided inside the inner baffle ring (103) and is connected to the inner wall of the inner tube (102); an outer baffle ring (105) is connected to the inner annular surface of the outer tube (101); the inner baffle ring (103) and the outer baffle ring (105) are located on the same plane; a baffle net (106) is connected to the outer annular surface of the outer tube (101); a heat exchange cavity is formed between the baffle net (106) and the outer baffle ring (105); The heat exchange cavity comprises an inner cavity (107) and an outer cavity (108); the inner cavity (107) is located on a side close to the outer retaining ring (105); a partition plate (109) is arranged between the inner cavity (107) and the outer cavity (108); a convex ring portion (110) is arranged on the partition plate (109); a heat conducting ring (111) is arranged inside the convex ring portion (110); a heat conducting plate (112) is connected to the outer ring surface of the heat conducting ring (111); a heat exchange plate (113) is connected to the heat conducting plate (112); the heat exchange plate (113) is located in the outer cavity (108); and the inner cavity (107) is filled with a heat conducting liquid.

2. The high-efficiency heat exchange device for geotechnical energy storage and recycling according to claim 1, characterized in that: The flow-turbulating channel (104) comprises a water inlet (114) and a water outlet (115); the water inlet (114) is arranged in a curved manner; an end of the water outlet (115) away from the inner tube (102) is arranged toward the bottom of the inner tube (102); an end of the water inlet (114) close to the axis is arranged toward the bottom of the inner tube (102); and the other end of the water outlet (115) is connected to the water inlet (114).

3. The high-efficiency heat exchange device for geotechnical energy storage and recycling according to claim 2, characterized in that: A flow-disturbing pipe (116) is arranged in the water outlet portion (115), and a spiral water-guiding convex pattern (117) is arranged on the inner wall of the flow-disturbing pipe (116).

4. The high-efficiency heat exchange device for geotechnical energy storage and recycling according to claim 1, characterized in that: A support frame (118) is connected between the inner tube (102) and the outer tube (101); the support frame (118) comprises an inner ring (119), an outer ring (120) and a support rod (121); the support rod (121) is connected between the inner ring (119) and the outer ring (120); shaking grooves (122) are provided on both sides of the support rod (121); and a shaking plate (123) is rotatably connected in the shaking groove (122).

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