Efficient rock-soil energy storage recycling system

Abstract

The utility model discloses an efficient rock-soil energy storage cyclic utilization system, which relates to the technical field of geothermal energy pipelines and comprises a geothermal circulation system, a heat pump host, a water end, a waste heat end and a plate heat exchanger, and a geothermal water supply pipeline and a geothermal water return pipeline are connected between the geothermal circulation system and the heat pump host. A tail end water supply pipeline and a tail end water return pipeline are connected among the heat pump main machine, the plate heat exchanger and the water using end, and a waste heat water supply pipeline and a waste heat water return pipeline are connected between the waste heat end and the plate heat exchanger. According to the efficient rock-soil energy storage cyclic utilization system, the situation of cold accumulation of geothermal energy can be reduced, the stability during use in winter is improved, meanwhile, heat can be stored in low rock-soil in summer, the heat storage effect is achieved, the heat obtaining efficiency during use in winter is improved, waste heat can be recycled, and the environment is protected. And the utilization efficiency of geothermal energy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal energy pipelines, and more specifically to a high-efficiency 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, such as when applied to air conditioning systems.

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

[0004] 1. The problem of heat balance, especially for areas where the demand for heat load in winter is greater than the demand for cold load in summer. 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 heat balance of the underground soil and reducing the efficiency of the system. Under long-term operation, this imbalance will cause an abnormal increase (heat accumulation) or decrease (cold accumulation) in soil temperature, destroying the natural thermal balance of the underground soil.

[0005] 2. For areas with small heat exchange capacity of shallow underground pipes or severe cold accumulation, it is impossible to provide effective heat support for the user end. Although the required heat can be increased by adding other heating equipment, the heat provided by each heating equipment is different, and the heat mixing is uneven, which will cause the water to be hot and cold, resulting in a decrease in user comfort.

[0006] Therefore, it is necessary to propose an efficient geotechnical energy storage and recycling system to solve the above problems. Utility Model Content

[0007] In view of the above problems, the utility model provides a high-efficiency rock and soil energy storage and recycling system; it has the effect of reducing the cold accumulation of geothermal energy, and at the same time can mix geothermal and waste heat energy to improve the user experience.

[0008] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0009] A high-efficiency geotechnical energy storage and recycling system comprises a geothermal circulation system, a heat pump main unit, a water-using end, a waste heat end and a plate heat exchanger, wherein a geothermal water supply pipeline and a geothermal water return pipeline are connected between the geothermal circulation system and the heat pump main unit, a terminal water supply pipeline and a terminal water return pipeline are connected between the heat pump main unit, the plate heat exchanger and the water-using end, a waste heat water supply pipeline and a waste heat water return pipeline are connected between the waste heat end and the plate heat exchanger, a connecting water supply pipeline is connected between the waste heat water supply pipeline and the geothermal water return pipeline, and a connecting water return pipeline is connected between the waste heat water return pipeline and the geothermal water supply pipeline;

[0010] The pipe connection of the terminal water supply pipe is connected with a water mixing device, and the water mixing device includes a main pipe, a secondary pipe and a sleeve, one end of the main pipe is connected to the end of the terminal water supply pipe close to the heat pump host, the other end of the main pipe is connected to the end of the terminal water supply pipe close to the water use end, and one end of the secondary pipe is connected to the end of the terminal water supply pipe close to the plate heat exchanger;

[0011] The sleeve is sleeved on the inner wall of the main pipe, a cavity is provided between the sleeve and the main pipe, one end of the secondary pipe extends into the cavity, the inner wall diameter of the sleeve is smaller than the inner wall diameter of the main pipe, and a water outlet hole connected to the cavity is opened on the inner wall of the sleeve.

[0012] Preferably, an internal mixing pipe is provided inside the end of the main pipeline away from the water supply, a hollow connecting pipe is connected between the internal mixing pipe and the cavity, and an array of water outlet holes are provided on both sides of the connecting pipe and the outer annular surface of the internal mixing pipe.

[0013] Preferably, a guide boss inclined toward both sides is provided on the outer wall of the internal water mixing pipe, and the guide boss is located between two adjacent water outlet holes.

[0014] Preferably, guide stripes are provided on the inner annular surface of the sleeve and the outer wall of the internal mixing water pipe, a water guide cone is connected to one end of the internal mixing water pipe facing the sleeve, and a support frame fixed to the inner wall of the main pipeline is connected to the other side of the internal mixing water pipe.

[0015] Preferably, the geothermal water supply pipeline and the geothermal water return pipeline are connected with geothermal switch valves, and the end of the geothermal water supply pipeline close to the heat pump main unit is connected with a geothermal circulation pump.

[0016] Preferably, the waste heat water supply pipe and the waste heat return pipe are connected to a waste heat switching valve at one end close to the plate heat exchanger, the connecting water supply pipe and the connecting return pipe are connected to a connecting switching valve, and the end water supply pipe is connected to a terminal circulation pump at one side close to the water use end.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. Through the cooperation between the geothermal circulation system and the waste heat end, this device can reduce the cold accumulation of geothermal energy and improve the stability during winter use. At the same time, it can store heat in underground rock and soil in summer, which plays a role in storing heat and improves the heat extraction efficiency during winter use. It can also recycle waste heat and improve the utilization efficiency of geothermal energy.

[0019] 2. This device is equipped with a water mixing device on the terminal water supply pipe. The water mixing device can effectively mix geothermal energy and waste heat to avoid the situation where the water body is hot and cold, thereby improving the user experience at the water end. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the structure of the water mixing device in the utility model;

[0022] Figure 3 It is a cross-sectional schematic diagram of the structure of the water mixing device in the utility model;

[0023] Figure 4 It is a schematic diagram of the internal water mixing pipe and the connecting pipe structure in the utility model.

[0024] Reference numerals:

[0025] 100. Geothermal circulation system; 101. Heat pump host; 102. Water use end; 103. Waste heat end; 104. Plate heat exchanger; 105. Geothermal water supply pipeline; 106. Geothermal return pipeline; 107. Terminal water supply pipeline; 108. Terminal return pipeline; 109. Waste heat water supply pipeline; 110. Waste heat return pipeline; 111. Connecting water supply pipeline; 112. Connecting return pipeline; 113. Mixing water device 114. Main pipeline; 115. Auxiliary pipeline; 116. Casing; 117. Cavity; 118. Water outlet; 119. Geothermal switch valve; 120. Waste heat switch valve; 121. Connecting switch valve; 122. Internal mixing water pipe; 123. Connecting pipe; 124. Guide boss; 125. Guide stripes; 126. Water guide cone; 127. Support frame; 128. Geothermal circulation pump; 129. Terminal circulation pump. DETAILED DESCRIPTION

[0026] 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.

[0027] See also Figure 1-4 A high-efficiency geotechnical energy storage and recycling system includes a geothermal circulation system 100, a heat pump main unit 101, a water-using end 102, a waste heat end 103 and a plate heat exchanger 104. The waste heat end 103 is a fluid medium containing heat that is not fully utilized and discharged during various industrial processes, energy conversion or equipment operation. In summer, heat is transported into the geotechnical layer of the geothermal circulation system 100 through a connecting water supply pipe 111 and a connecting return water pipe 112, so as to be taken in winter.

[0028] When the geothermal circulation system 100 is used in winter, the heat supply may be unstable due to the accumulation of geothermal cold. The following provides a piping system that can be used in conjunction with the geothermal circulation system 100 and the waste heat end 103: Figure 1 A geothermal water supply pipe 105 and a geothermal water return pipe 106 are connected between the geothermal circulation system 100 and the heat pump host 101. The geothermal circulation system 100 provides heat to the water use end 102 through the heat pump host 101. A terminal water supply pipe 107 and a terminal water return pipe 108 are connected between the heat pump host 101, the plate heat exchanger 104 and the water use end 102. A waste heat water supply pipe 109 and a waste heat water return pipe 110 are connected between the waste heat end 103 and the plate heat exchanger 104.

[0029] refer to Figure 1 In winter, the connecting switch valve 121 is closed, the waste heat switch valve 120 and the geothermal switch valve 119 are opened, and the geothermal circulation system 100 heats the terminal return water pipe 108 through the heat pump host 101. At the same time, the waste heat end 103 also exchanges heat with the fluid in the terminal return water pipe 108 through the plate heat exchanger 104, and heats the user end through geothermal energy and waste heat energy, thereby increasing the heating supply in winter;

[0030] A connecting water supply pipe 111 is connected between the waste heat water supply pipe 109 and the geothermal return water pipe 106, and a connecting return water pipe 112 is connected between the waste heat return water pipe 110 and the geothermal water supply pipe 105. Figure 1 In summer, the connecting switch valve 121 is opened, the waste heat switch valve 120 and the geothermal switch valve 119 are closed, and the waste heat end 103 transports the heat into the geothermal circulation system 100 through the connecting water supply pipe 111 and the connecting return water pipe 112, thereby reducing the cold accumulation of geothermal energy for use in winter;

[0031] Since the temperature of industrial waste heat energy is mostly high, even through the heat exchange of the heat exchanger, there is still a temperature difference between the waste heat and the geothermal heat. When the heat with the temperature difference is not completely mixed, it will affect the use of the water end 102. The following provides a structure that can accelerate the mixing of waste heat and geothermal heat: Reference Figure 2 The pipe connection of the terminal water supply pipe 107 is connected with a water mixing device 113, and the water mixing device 113 includes a main pipe 114, a sub-pipe 115 and a sleeve 116. One end of the main pipe 114 is connected to the end of the terminal water supply pipe 107 close to the heat pump host 101, and the end close to the internal water mixing pipe 122 is arranged toward the water use end 102. After heat exchange in the heat pump host 101, the liquid flowing in the terminal return pipe 108 will enter the terminal water supply pipe 107 and enter the water mixing device 113 from the end away from the internal water mixing pipe 122. The liquid passing through the plate heat exchanger 104 will enter the cavity 117 through the sub-pipe 115. The other end of the main pipe 114 is connected to the end of the terminal water supply pipe 107 close to the water use end 102, and one end of the sub-pipe 115 is connected to the end of the terminal water supply pipe 107 close to the plate heat exchanger 104.

[0032] refer to Figure 3 The sleeve 116 is sleeved on the inner wall of the main pipe 114. The sleeve 116 is used to reduce the diameter of the pipe here, so as to increase the flow rate of the liquid. A cavity 117 is arranged between the sleeve 116 and the main pipe 114. One end of the auxiliary pipe 115 extends into the cavity 117. The inner wall diameter of the sleeve 116 is smaller than the inner wall diameter of the main pipe 114. A water outlet 118 connected to the cavity 117 is opened on the inner wall of the sleeve 116. When the liquid in the main pipe 114 passes through the sleeve 116, because the inner wall pipe of the sleeve 116 becomes narrower, based on the Venturi effect, the flow rate of the liquid increases. At the same time, the liquid in the cavity 117 flows out from the water outlet 118, and the two high-temperature water flows produce a mixing effect.

[0033] When two fluids are mixed, the fluid entering from the cavity 117 will be located at the boundary of the fluid, and there will be no mixing at the center. The following provides a structure that can mix from the center: Figure 3 and Figure 4 Specifically, an internal mixing water pipe 122 is provided inside the end of the main pipe 114 away from the water supply, and a hollow connecting pipe 123 is connected between the internal mixing water pipe 122 and the cavity 117. The internal mixing water pipe 122 is located near the center of the fluid. The fluid in the cavity 117 can enter the internal mixing water pipe 122 through the connecting pipe 123, and then flow out from the water outlet holes 118 on the outer wall of the internal mixing water pipe 122, and mix with the high-temperature liquid flowing through from the center position. Arrays of water outlet holes 118 are provided on both sides of the connecting pipe 123 and on the outer annular surface of the internal mixing water pipe 122. When the fluid flows through the outer wall of the connecting pipe 123, the fluid in the connecting pipe 123 will also flow out, thereby causing mixing.

[0034] Specifically, refer to Figure 4A guide boss 124 inclined to both sides is provided on the outer wall of the internal mixing water pipe 122. The fluid flowing out of the water outlet 118 will be guided to both sides by the guide boss 124 to avoid the stacking of high-temperature fluid flowing out of multiple water outlets 118. The guide boss 124 is located between two adjacent water outlets 118.

[0035] Specifically, refer to Figure 3 and Figure 4 Guide stripes 125 are provided on the inner annular surface of the casing 116 and the outer wall of the internal mixing water pipe 122 for destroying the boundary layer of the fluid. A water guide cone 126 is connected to one end of the internal mixing water pipe 122 facing the casing 116 for reducing the impact of the water flow on the internal mixing water pipe 122. The other side of the internal mixing water pipe 122 is connected to a support frame 127 fixed on the inner wall of the main pipe 114, and the support frame 127 plays a supporting role.

[0036] Specifically, refer to Figure 1 A geothermal switch valve 119 is connected to the geothermal water supply pipe 105 and the geothermal return water pipe 106. A geothermal circulation pump 128 is connected to one end of the geothermal water supply pipe 105 close to the heat pump host 101. The circulation pump is used to drive the flow of water.

[0037] Specifically, refer to Figure 1 The waste heat water supply pipe 109 and the waste heat return pipe 110 are connected to the waste heat switch valve 120 at one end near the plate heat exchanger 104, and the connecting water supply pipe 111 and the connecting return pipe 112 are connected to the connecting switch valve 121. Different switch valves are used to control different pipelines. The geothermal switch valve 119, the waste heat switch valve 120 and the connecting switch valve 121 are two symmetrically arranged valves for controlling the on-off of the water supply line and the return line. The end water supply pipe 107 is connected to the end circulation pump 129 on the side near the water use end 102.

[0038] In this embodiment, in winter, the connecting switch valve 121 is closed, the geothermal switch valve 119 and the waste heat switch valve 120 are opened, and the terminal water supply pipe 107 and the terminal return water pipe 108 exchange heat with the geothermal circulation system 100 and the waste heat end 103 energy through the heat pump host 101 and the plate heat exchanger 104, thereby supplying the water supply end 102, thereby improving the stability of winter use;

[0039] In summer, the connecting switch valve 121 is opened, the geothermal switch valve 119 and the waste heat switch valve 120 are closed, and the waste heat end 103 is connected to the geothermal circulation system 100, so that the waste heat of the waste heat end 103 can be stored in the underground rock formation through the pipeline for use in winter.

[0040] 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. An efficient rock and soil energy storage and recycling system, characterized by: The invention comprises a geothermal circulation system (100), a heat pump main unit (101), a water use end (102), a waste heat end (103) and a plate heat exchanger (104); a geothermal water supply pipeline (105) and a geothermal water return pipeline (106) are connected between the geothermal circulation system (100) and the heat pump main unit (101); and a terminal water supply pipeline (105) and a geothermal water return pipeline (106) are connected between the heat pump main unit (101), the plate heat exchanger (104) and the water use end (102). 07) and a terminal return water pipeline (108), a waste heat water supply pipeline (109) and a waste heat return water pipeline (110) are connected between the waste heat end (103) and the plate heat exchanger (104), a connecting water supply pipeline (111) is connected between the waste heat water supply pipeline (109) and the geothermal return water pipeline (106), and a connecting return water pipeline (112) is connected between the waste heat return water pipeline (110) and the geothermal water supply pipeline (105); A water mixing device (113) is connected to the pipe connection of the terminal water supply pipe (107), and the water mixing device (113) comprises a main pipe (114), a secondary pipe (115) and a sleeve (116); one end of the main pipe (114) is connected to an end of the terminal water supply pipe (107) close to the heat pump main unit (101); the other end of the main pipe (114) is connected to an end of the terminal water supply pipe (107) close to the water use end (102); and one end of the secondary pipe (115) is connected to an end of the terminal water supply pipe (107) close to the plate heat exchanger (104); The sleeve (116) is sleeved on the inner wall of the main pipe (114); a cavity (117) is provided between the sleeve (116) and the main pipe (114); one end of the secondary pipe (115) extends into the cavity (117); the inner wall diameter of the sleeve (116) is smaller than the inner wall diameter of the main pipe (114); and a water outlet hole (118) connected to the cavity (117) is provided on the inner wall of the sleeve (116).

2. The high-efficiency rock and soil energy storage and recycling system according to claim 1 is characterized by: An internal water mixing pipe (122) is arranged inside the end of the main pipe (114) away from the water supply, a hollow connecting pipe (123) is connected between the internal water mixing pipe (122) and the cavity (117), and an array of water outlet holes (118) are provided on both sides of the connecting pipe (123) and the outer annular surface of the internal water mixing pipe (122).

3. The high-efficiency rock and soil energy storage and recycling system according to claim 2 is characterized by: A guide boss (124) inclined toward both sides is provided on the outer wall of the internal water mixing pipe (122), and the guide boss (124) is located between two adjacent water outlet holes (118).

4. The high-efficiency rock and soil energy storage and recycling system according to claim 3 is characterized by: Guide stripes (125) are provided on the inner annular surface of the casing (116) and the outer wall of the internal water mixing pipe (122); one end of the internal water mixing pipe (122) facing the casing (116) is connected to a water guide cone (126); the other side of the internal water mixing pipe (122) is connected to a support frame (127) fixed on the inner wall of the main pipeline (114).

5. The high-efficiency rock and soil energy storage and recycling system according to claim 1 is characterized by: The geothermal water supply pipeline (105) and the geothermal water return pipeline (106) are connected to a geothermal switch valve (119), and one end of the geothermal water supply pipeline (105) close to the heat pump main unit (101) is connected to a geothermal circulation pump (128).

6. The high-efficiency rock and soil energy storage and recycling system according to claim 1 is characterized by: The waste heat water supply pipe (109) and the waste heat water return pipe (110) are connected to a waste heat switch valve (120) at one end close to the plate heat exchanger (104), the connecting water supply pipe (111) and the connecting water return pipe (112) are connected to a connecting switch valve (121), and the end water supply pipe (107) is connected to a end circulation pump (129) at one side close to the water use end (102).

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