Multi-energy coupling rock-soil energy storage cyclic utilization system

Abstract

The utility model discloses a multi-energy coupling rock-soil energy storage cyclic utilization system, which relates to the technical field of geothermal devices and comprises a heat pump host, an office water end, a domestic water end, a solar heat collection system and a rock-soil energy storage cyclic utilization system. A geothermal water supply pipe and a geothermal water return pipe are connected between the rock-soil energy storage recycling system and the heat pump main machine, and a heat supply water supply pipe and a heat supply water return pipe are connected between the other end of the heat pump main machine and the office water end. The multi-energy coupling rock-soil energy storage cyclic utilization system has the functions of heating in winter and refrigerating in summer, and aims at the problem of cold and heat imbalance, the solar heat collection system is assisted to supplement heat load in winter, and the solar heat collection system simultaneously meets the requirement of domestic hot water.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal devices, and more specifically to a multi-energy coupling rock and soil energy storage and recycling system. Background Art

[0002] Geotechnical energy storage recycling systems are those that use the natural environment inside the earth, such as soil, rock, aquifers or cavities, as a storage medium for thermal or mechanical energy. Such systems can provide a buffer between energy demand and supply, help balance grid loads, improve energy efficiency, and reduce carbon emissions.

[0003] The following problems still exist in the process of using the geotechnical energy storage recycling system:

[0004] 1. In winter, the heat taken out of the soil by the system is greater than the heat discharged into the soil in summer. The cumulative operation of multiple heating and cooling seasons will lead to cold accumulation, destroying the thermal balance of the underground soil and reducing the efficiency of the system. Under long-term operation, this imbalance will lead to an abnormal decrease in soil temperature (cold accumulation), destroying the natural thermal balance of the underground soil, which will affect the use of geothermal energy in winter.

[0005] 2. Due to the small heat exchange capacity of a single underground pipe well, the large number of wells drilled and the large space required for construction, effective heat support cannot be provided without sufficient drilling sites, especially on cold-stacked underground pipes, which affects the quality of heating in winter and causes a decline in the user experience. In addition, when the geothermal pipe is in use, the inner and outer pipes will be out of axial alignment, affecting the flow of the heat exchange medium and reducing the efficiency of heat exchange.

[0006] 3. A boundary layer will appear during the flow of the heat exchange medium. Since the temperature at the bottom of the heat exchange well is higher than that at the top, the heat exchange at the bottom will directly affect the heat exchange efficiency, and the boundary layer will cause a decrease in the heat exchange efficiency.

[0007] Therefore, it is necessary to propose a multi-energy coupling rock and soil energy storage recycling system to solve the above problems. Utility Model Content

[0008] In view of the above problems, the utility model provides a multi-energy coupled rock and soil energy storage and recycling system; it has the function of increasing the heating supply in winter, and can store it in underground rock formations in summer for use in winter. At the same time, it can support the inner pipe 116 so that it and the outer pipe 117 are located on the same axis, thereby improving the heat exchange efficiency.

[0009] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0010] A multi-energy coupled geotechnical energy storage and recycling system, comprising a heat pump main unit, an office water end, a domestic water end, a solar heat collection system and a geotechnical energy storage and recycling system, wherein a geothermal water supply pipe and a geothermal water return pipe are connected between the geotechnical energy storage and recycling system and the heat pump main unit, and a heating water supply pipe and a heating water return pipe are connected between the other end of the heat pump main unit and the office water end;

[0011] A solar water supply pipe is connected between the heating water supply pipe and the solar thermal collection system, a solar water return pipe is connected between the heating water return pipe and the solar thermal collection system, and a domestic water pipeline is connected between the solar water supply pipe, the solar water return pipe and the domestic water end;

[0012] The rock and soil energy storage and recycling system is composed of a plurality of geothermal well pipes, wherein the geothermal well pipes include an inner pipe and an outer pipe sleeved outside the inner pipe, a support frame is connected to the bottom wall of the outer pipe, and the support frame is composed of a plurality of circumferentially evenly distributed guide plates, and the guide plates are spirally arranged, and a fixed sleeve is connected to the bottom of the outer wall of the inner pipe, and the fixed sleeve is installed at the center position of the support frame.

[0013] Preferably, a geothermal circulation pump is installed on the geothermal water supply pipe, and a terminal circulation pump is installed on the heating water supply pipe.

[0014] Preferably, a mixing switch valve is installed on the solar water supply pipe, and the mixing switch valve includes a water supply valve and a return valve.

[0015] Preferably, a rotation convex pattern is provided on the outer wall of the fixed sleeve, and the direction of the rotation convex pattern is opposite to that of the guide plate.

[0016] Preferably, a guide portion and a fixing portion are provided on one side of the guide plate close to the inner tube, the fixing portion is located at the bottom of the guide portion, a fixing ring supporting a fixing sleeve is connected to the fixing portion, and the fixing sleeve is located at the top of the fixing ring.

[0017] Preferably, the edge of the guide plate is provided with turbulent holes with equal spacing.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. In winter, the buried heat exchanger of the rock and soil energy storage and recycling system exchanges heat with the soil, and the heat in the soil is taken out for use by the heat-using end. At the same time, the solar thermal collection system is coupled as a supplementary heat source for winter heating, which further improves the heat required for heating for the heat-using end and improves the user experience of the heat-using end. In addition, the solar thermal collection system also takes into account the function of preparing domestic hot water, and switches between heating and domestic hot water modes through the water storage tank to adapt to different usage modes.

[0020] 2. In summer, the device will use the buried heat exchanger of the geological energy storage recycling system to exchange heat with the soil, and discharge the heat to the surrounding soil to slow down the cold accumulation of the soil, so as to ensure that the heat taken from the soil in winter and the heat discharged from the soil in summer are relatively balanced, so as to ensure the stability of the cold and heat sources in the next heating and cooling season, ensure that the heating efficiency meets the use requirements, and have a cooling effect in summer. At this time, the solar thermal collection system can be used as domestic hot water for use at the water end.

[0021] 3. The device is provided with a support frame assembly inside the outer tube, which supports the inner tube by setting a plurality of guide plates. At the same time, it can play a positioning role during the installation of the inner tube, so that the inner tube and the outer tube are on the same axis, avoiding the inner tube from tilting.

[0022] 4. By setting the guide plate and the rotating convex pattern in opposite directions, the boundary layer of the heat exchange medium can be effectively destroyed to improve the heat exchange efficiency between the heat exchange medium and high-temperature rock and soil. At the same time, the turbulent holes on the edge can further break the laminar flow state, causing the heat exchange medium to appear turbulent state, slowing down the flow rate of the heat exchange medium and improving the heat exchange efficiency between the heat exchange medium and high-temperature rock and soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the utility model;

[0024] Figure 2 It is a schematic diagram of the inner tube and outer tube structure in the utility model;

[0025] Figure 3 It is a schematic diagram of the support frame and the fixed sleeve structure in the utility model;

[0026] Figure 4 It is a schematic diagram of the guide plate structure in the utility model.

[0027] Reference numerals:

[0028] 101. Heat pump main unit; 102. Office water terminal; 103. Domestic water terminal; 104. Solar thermal collection system; 105. Geotechnical energy storage and recycling system; 106. Geothermal water supply pipe; 107. Geothermal return pipe; 108. Heating water supply pipe; 109. Heating return pipe; 110. Solar water supply pipe; 111. Solar return pipe; 112. Domestic water pipeline; 113. Geothermal circulation pump; 114. Terminal circulation pump; 115. Mixing switch valve; 116. Inner pipe; 117. Outer pipe; 118. Guide plate; 119. Fixed sleeve; 120. Rotating convex pattern; 121. Guide part; 122. Fixed part; 123. Fixed ring; 124. Turbulent flow hole. DETAILED DESCRIPTION

[0029] 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.

[0030] See also Figure 1-4 A multi-energy coupled geotechnical energy storage and recycling system includes a heat pump host 101, an office water terminal 102, a domestic water terminal 103, a solar thermal collection system 104 and a geotechnical energy storage and recycling system 105. In winter, the office water terminal 102 and the domestic water terminal 103 need the solar thermal collection system 104 and the geotechnical energy storage and recycling system 105 to supply heat. In summer, the solar thermal collection system 104 can supply heat to the domestic water terminal 103. At this time, the office water terminal 102 transfers the heat generated in summer to the geotechnical energy storage and recycling system 105. 5 is stored in the surrounding soil to avoid cold accumulation so that it can be taken out in winter. A geothermal water supply pipe 106 and a geothermal return pipe 107 are connected between the geotechnical energy storage recycling system 105 and the heat pump host 101. A heating water supply pipe 108 and a heating return pipe 109 are connected between the other end of the heat pump host 101 and the office water end 102. The geotechnical energy storage recycling system 105 exchanges heat with the heating water supply pipe 108 and the heating return pipe 109 through the heat pump host 101, thereby supplying heat to the office water end 102 and the domestic water end 103.

[0031] In areas with limited geothermal energy or severe cold accumulation, when the geotechnical energy storage recycling system 105 cannot provide stable heat, the following structure is provided to enhance winter heating: Figure 1 A solar water supply pipe 110 is connected between the heating water supply pipe 108 and the solar thermal collection system 104, a solar water return pipe 111 is connected between the heating water return pipe 109 and the solar thermal collection system 104, the solar water supply pipe 110 and the solar water return pipe 111 are connected to a water tank in the solar thermal collection system 104, the solar thermal collection system 104 includes a water tank, a water pump and solar energy equipment, the solar water supply pipe 110, the solar water return pipe 111 and the domestic water end 103 are connected to a domestic water pipe 112, through the cooperation of the solar thermal collection system 104 and the geotechnical energy storage recycling system 105, the heating capacity in winter can be increased, and the heating experience of the office water end 102 and the domestic water end 103 can be improved;

[0032] During the installation of the inner tube 116 in the outer tube 117, there will be a misalignment, which will affect the heat exchange efficiency of the geotechnical energy storage recycling system 105. The following provides a structure that is convenient for positioning and supporting the inner tube 116: Figure 2 and Figure 3 The geotechnical energy storage and recycling system 105 is composed of multiple geothermal well pipes, which include an inner pipe 116 and an outer pipe 117 sleeved outside the inner pipe 116. A support frame is connected to the bottom wall of the outer pipe 117, and the support frame is composed of multiple circumferentially evenly distributed guide plates 118. When the inner pipe 116 moves downward, it will be pressed on the top of the support frame. The multiple guide plates 118 support the bottom of the inner pipe 116. At the same time, the guide plates 118 are inclined to destroy the laminar flow state of the heat exchange medium during the flow, so that the heat exchange between the heat exchange medium and the high-temperature rock and soil is more comprehensive. The guide plates 118 are spirally arranged, and the bottom of the outer wall of the inner pipe 116 is connected to a fixed sleeve 119, which is installed at the center of the support frame. When the inner pipe 116 moves downward, it will slide from the guide part 121 to the fixed part 122, thereby maintaining coaxiality with the outer pipe 117.

[0033] Specifically, refer to Figure 1 A geothermal circulation pump 113 is installed on the geothermal water supply pipe 106, and a terminal circulation pump 114 is installed on the heating water supply pipe 108. The geothermal circulation pump 113 and the terminal circulation pump 114 promote the flow of water.

[0034] Specifically, refer to Figure 1 A mixed switch valve 115 is installed on the solar water supply pipe 110. The mixed switch valve 115 includes a water supply valve and a return valve, which is used to control the on-off state of the solar water supply pipe 110 and the solar return pipe 111. In winter, the mixed switch valve 115 is in an open state, so that the solar thermal collection system 104 and the geotechnical energy storage recycling system 105 can provide a stable heat supply for the office water terminal 102;

[0035] In summer, the mixed switch valve 115 is closed, so that the solar thermal collection system 104 can only supply heat to the domestic water end 103. At this time, the office water end 102 supplies heat to the rock and soil energy storage recycling system 105 through the heat pump host 101, thereby storing the heat in the underground rock and soil.

[0036] Specifically, refer to Figure 2 and Figure 3 A rotating convex pattern 120 is arranged on the outer wall of the fixed sleeve 119, and the direction of the rotating convex pattern 120 is opposite to that of the guide plate 118. Through the opposite arrangement, the heat exchange contact between the inner layer and the outer layer moves in opposite directions, thereby effectively breaking the boundary layer and improving the heat exchange efficiency.

[0037] Specifically, refer to Figure 4 A guide portion 121 and a fixing portion 122 are provided on one side of the guide plate 118 close to the inner tube 116. When the inner tube 116 moves in detail in the outer tube 117, it will first come into contact with the guide portion 121, and as it continues to move downward, it slides into the fixing portion 122, and the inner tube 116 is fixed by the fixing portion 122. The fixing portion 122 is located at the bottom of the guide portion 121, and a fixing ring 123 supporting the fixing sleeve 119 is connected to the fixing portion 122. The fixing ring 123 supports the inner tube 116 and is fixed on multiple guide plates 118 at the same time, and is used to fix the guide plates 118. The fixing sleeve 119 is located at the top of the fixing ring 123.

[0038] Specifically, refer to Figure 4 The edge of the guide plate 118 is provided with turbulent holes 124 at equal intervals. When the heat exchange medium flows along the guide plate 118, it will be affected by the turbulent holes 124 and move to the other side of the guide plate 118, thereby disturbing the heat exchange medium on the other side and further improving the heat exchange efficiency.

[0039] In this embodiment, the geotechnical energy storage recycling system 105 transmits the heat after heat exchange to the heat pump host 101 through the geothermal water supply pipe 106 and the geothermal return pipe 107, and the heat pump host 101 transmits the heat to the office water end 102 through the heating water supply pipe 108 and the heating return pipe 109. The solar thermal collection system 104 transmits the heat converted by solar energy to the domestic water end 103 through the solar water supply pipe 110, the solar return pipe 111 and the domestic water pipe 112. In winter, the mixed switch valve 115 is opened, so that the heat of the solar thermal collection system 104 can also be supplied to the office water end 102, thereby increasing the heat supply to the office water end 102 in winter;

[0040] In summer, the mixed switch valve 115 is closed, and the office water end 102 exchanges heat to the geotechnical energy storage recycling system 105 through the heat pump host 101, and the heat is transported to the underground rock formation.

[0041] 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 multi-energy coupled rock and soil energy storage and recycling system, characterized by: The invention comprises a heat pump main unit (101), an office water end (102), a domestic water end (103), a solar heat collection system (104) and a geotechnical energy storage and recycling system (105); a geothermal water supply pipe (106) and a geothermal water return pipe (107) are connected between the geotechnical energy storage and recycling system (105) and the heat pump main unit (101); a heating water supply pipe (108) and a heating water return pipe (109) are connected between the other end of the heat pump main unit (101) and the office water end (102); A solar water supply pipe (110) is connected between the heating water supply pipe (108) and the solar thermal collection system (104); a solar water return pipe (111) is connected between the heating water return pipe (109) and the solar thermal collection system (104); and a domestic water pipeline (112) is connected between the solar water supply pipe (110), the solar water return pipe (111) and the domestic water end (103); The geotechnical energy storage and recycling system (105) is composed of a plurality of geothermal well pipes, wherein the geothermal well pipes include an inner pipe (116) and an outer pipe (117) sleeved outside the inner pipe (116); a support frame is connected to the bottom wall of the outer pipe (117); the support frame is composed of a plurality of circumferentially evenly distributed guide plates (118); the guide plates (118) are spirally arranged; a fixed sleeve (119) is connected to the bottom of the outer wall of the inner pipe (116); and the fixed sleeve (119) is installed at the center of the support frame.

2. A multi-energy coupled rock and soil energy storage and recycling system according to claim 1, characterized in that: A geothermal circulation pump (113) is installed on the geothermal water supply pipe (106), and a terminal circulation pump (114) is installed on the heating water supply pipe (108).

3. The multi-energy coupled rock and soil energy storage and recycling system according to claim 1 is characterized by: The solar water supply pipe (110) is provided with a mixing switch valve (115), and the mixing switch valve (115) comprises a water supply valve and a water return valve.

4. The multi-energy coupled rock and soil energy storage and recycling system according to claim 1 is characterized by: A rotating convex pattern (120) is provided on the outer wall of the fixed sleeve (119), and the direction of the rotating convex pattern (120) is opposite to that of the guide plate (118).

5. A multi-energy coupled rock and soil energy storage and recycling system according to claim 4, characterized in that: A guide portion (121) and a fixing portion (122) are provided on one side of the guide plate (118) close to the inner tube (116); the fixing portion (122) is located at the bottom of the guide portion (121); a fixing ring (123) supporting a fixing sleeve (119) is connected to the fixing portion (122); and the fixing sleeve (119) is located at the top of the fixing ring (123).

6. A multi-energy coupled rock and soil energy storage and recycling system according to claim 5, characterized in that: Turbulent flow holes (124) with equal spacing are provided at the edge of the guide plate (118).

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