Variable working condition heat pump heating system for industrialized aquaculture

Abstract

The application provides a factory aquaculture variable working condition heat pump heating system, which comprises a ground source heat pump unit and a heat supplement unit. The ground source heat pump unit comprises a ground source heat pump and a secondary heat exchanger. The secondary heat exchanger is provided with a first passage and a second passage capable of heat exchange with each other. The second passage is used for heat exchange with the ground source heat pump. The water inlet of the first passage is used for communication with a new water pipe. The water outlet of the first passage is connected with the water inlet of the breeding pond. The heat supplement unit comprises a heat supplement pipeline arranged in the breeding pond and a heat exchange pipeline used for heat exchange with the second passage of the secondary heat exchanger. The heat exchange pipeline is connected with the heat supplement pipeline to form a circulation loop. The ground source heat pump uses underground water as a heat source to realize water replacement heating and constant temperature heat supplement of the breeding water body, so that the temperature requirement of the breeding water body is met. According to the actual breeding demand, one set of system can meet the variable working condition requirements of water replacement heating and constant temperature heat supplement, and the economic cost and operation regulation and control are considered.

Description

Technical Field

[0001] This invention relates to the field of industrialized aquaculture technology, and in particular to a variable-condition heat pump heating system for industrialized aquaculture. Background Technology

[0002] Since the beginning of the 21st century, with the support of national policies, the improvement of fishery technology, and the transformation of consumption patterns, factory-style aquaculture has become a vigorously developing industry across the country, especially in coastal areas, adding tremendous impetus to local economic development. However, factory-style aquaculture also faces development bottlenecks. On the one hand, it consumes a huge amount of energy, and on the other hand, its production technology is backward, thus hindering its continued progress towards large-scale and modernized operations.

[0003] In aquaculture along the northern coast, the water temperature needs to be maintained at 26-30℃ for the six-month autumn and winter seasons to meet the growth requirements of seafood such as Litopenaeus vannamei, which have high temperature requirements. However, due to the large volume of aquaculture water, the large amount of water exchange, and the low outdoor temperature, the heat supply and energy consumption of the aquaculture water cannot be ignored. Most aquaculture farms use geothermal extraction, coal-fired or gas-fired boilers, or even electric heating for water heating, but these methods cause resource waste, environmental damage, and high operating costs, which do not comply with national carbon reduction policies. Moreover, some coastal farms lack large-scale coal, gas, and electricity supplies; if they were to use coal-fired or gas-fired boilers or electric heating, they would need to build related equipment, resulting in high investment costs.

[0004] Importantly, most current aquaculture heating methods suffer from problems such as redundant equipment selection and design, high investment costs, and difficulty in meeting the changing operating conditions during the aquaculture process. In particular, in some aquaculture products with high environmental requirements, two separate systems are often used for heating the water for aquaculture and for maintaining a constant temperature in the aquaculture water, resulting in problems such as frequent start-ups and shutdowns of some units, unstable temperature regulation, and poor adaptability to operating conditions. Summary of the Invention

[0005] This invention provides a variable-condition heat pump heating system for factory-scale aquaculture to address the aforementioned shortcomings. By utilizing a ground-source heat pump with groundwater as the heat source, it achieves both water exchange heating and constant-temperature replenishment of the aquaculture water, meeting the temperature requirements of the aquaculture water. Furthermore, a single system can simultaneously meet the variable-condition requirements of water exchange heating and constant-temperature replenishment, balancing economic cost and operational control, according to actual aquaculture needs. This heating system replaces existing water heating methods, not only saving energy and reducing operating costs but also reducing environmental pollution, resulting in significant economic benefits and aligning with the national strategy of achieving carbon peaking and carbon neutrality.

[0006] This invention provides a variable-condition heat pump heating system for industrialized aquaculture, comprising:

[0007] A ground source heat pump unit, comprising a ground source heat pump and a secondary heat exchanger, wherein the secondary heat exchanger is provided with a first passage and a second passage capable of exchanging heat with each other, the second passage being used for heat exchange with the ground source heat pump, the inlet of the first passage being connected to a new water pipe, and the outlet of the first passage being connected to the inlet of an aquaculture pond.

[0008] The heating unit includes a heating pipe installed in the aquaculture pond and a heat exchange pipe for exchanging heat with a second passage of the secondary heat exchanger. The heat exchange pipe is connected to the heating pipe to form a circulation loop.

[0009] According to the present invention, a variable-condition heat pump heating system for industrialized aquaculture further includes a new water preheating heat exchanger for exchanging heat between new water and tailwater. The new water preheating heat exchanger is provided with a first heat exchange passage and a second heat exchange passage. The inlet of the first heat exchange passage is connected to the outlet of the aquaculture pond, the inlet of the second heat exchange passage is connected to the new water pipe, and the outlet of the second heat exchange passage is connected to the inlet of the first passage.

[0010] According to the present invention, a variable-condition heat pump heating system for factory-scale aquaculture is provided, wherein the heat exchange pipeline is a first passage, a first valve is provided between the outlet of the first passage and the inlet of the aquaculture pond, a second valve is provided between the outlet of the first passage and the inlet of the heat replenishment pipeline, a third valve is provided between the inlet of the first passage and the new water pipe, and a fourth valve is provided between the inlet of the first passage and the outlet of the heat replenishment pipeline, and the first valve, the second valve, the third valve and the fourth valve can be switched between a closed state and an open state respectively.

[0011] According to the present invention, a variable-condition heat pump heating system for industrialized aquaculture is provided, wherein the second passage of the secondary heat exchanger is connected to the condenser of the ground source heat pump to form a loop.

[0012] According to the present invention, a variable-condition heat pump heating system for industrialized aquaculture is provided, wherein the evaporator of the ground source heat pump is provided with a groundwater inlet for groundwater to enter and a groundwater outlet for groundwater to exit, and the evaporator of the ground source heat pump is capable of absorbing heat from the groundwater.

[0013] According to the present invention, a variable-condition heat pump heating system for industrialized aquaculture is provided, wherein the heat replenishment unit further includes a water replenishment device, the water replenishment device comprising:

[0014] Water tank;

[0015] A water replenishment and pressure regulating pump is provided, wherein the inlet of the water replenishment and pressure regulating pump is connected to the water replenishment tank, and the outlet of the water replenishment and pressure regulating pump is connected to the circulation loop.

[0016] According to the present invention, a variable-condition heat pump heating system for factory-scale aquaculture is provided, wherein two ground source heat pump units are provided, namely a first ground source heat pump unit and a second ground source heat pump unit.

[0017] According to the present invention, a variable-condition heat pump heating system for factory-scale aquaculture is provided, wherein the heat exchange pipeline is the first passage of the second secondary heat exchanger of the second ground source heat pump unit, the first valve is disposed between the outlet of the first passage of the second secondary heat exchanger and the inlet of the aquaculture pond, the second valve is disposed between the outlet of the first passage of the second secondary heat exchanger and the inlet of the heat replenishment pipeline, the third valve is disposed between the inlet of the first passage of the second secondary heat exchanger and the new water pipe, and the fourth valve is disposed between the inlet of the first passage of the second secondary heat exchanger and the outlet of the heat replenishment pipeline.

[0018] According to the present invention, a variable-condition heat pump heating system for factory-scale aquaculture is provided, wherein the ground source heat pump unit further includes a submersible well water pump for lifting groundwater, the submersible well water pump being connected to the groundwater inlet, and a cyclone desander being provided between the submersible well water pump and the groundwater inlet.

[0019] According to the present invention, a variable-condition heat pump heating system for industrialized aquaculture further includes a wastewater treatment unit, wherein the wastewater treatment unit comprises:

[0020] A tailwater sedimentation tank, wherein the inlet of the tailwater sedimentation tank is connected to the outlet of the aquaculture pond;

[0021] The tailwater filter has an inlet that is connected to the outlet of the tailwater sedimentation tank, and an outlet that is connected to the inlet of the first heat exchange passage.

[0022] The variable-condition heat pump heating system for factory-scale aquaculture provided by this invention utilizes ground-source heat pumps to use groundwater as a heat source for both water exchange heating and maintaining a constant temperature in the aquaculture water body. This meets the temperature requirements of the aquaculture water body. Furthermore, a single system can simultaneously meet the variable-condition requirements of water exchange heating and constant temperature replenishment, achieving a balance between economic cost and operational control, depending on actual aquaculture needs. This heating system replaces existing water heating methods, not only saving energy and reducing operating costs but also reducing environmental pollution, resulting in significant economic benefits and aligning with the national strategy of achieving carbon peaking and carbon neutrality.

[0023] Furthermore, after the fresh water is preheated by recovering the waste heat of the tailwater through a fresh water preheating heat exchanger, it is further heated by a ground source heat pump unit before entering the aquaculture pond. The recovery of waste heat from the tailwater for preheating the fresh water helps to reduce the selection of ground source heat pump units. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the variable-condition heat pump heating system for factory-scale aquaculture provided by the present invention.

[0026] Figure label:

[0027] 1: Aquaculture pond; 2: Wastewater sedimentation tank; 3: Wastewater filter;

[0028] 4: Fresh water preheating heat exchanger; 5: First ground source heat pump; 6: Second ground source heat pump;

[0029] 7: Primary and secondary heat exchangers; 8: Secondary and secondary heat exchangers; 9: Makeup water tank;

[0030] 10: Heat replenishment pipeline; 21: Tailwater pump; 22: Fresh water pump;

[0031] 23: Submersible pump for the first well; 24: Submersible pump for the second well; 25: Heat replenishment circulation pump;

[0032] 26: First circulation pump; 27: Second circulation pump; 28: Make-up water pressure pump;

[0033] 31: First valve; 32: Second valve; 33: Third valve;

[0034] 34: Fourth valve; 35: Water supply pump valve; 101: First pipeline;

[0035] 102: Second pipe; 103: Third pipe; 104: Fourth pipe;

[0036] 105: Fifth pipeline; 106: Sixth pipeline; 107: Seventh pipeline;

[0037] 108: Eighth pipe; 109: Ninth pipe; 110: Tenth pipe;

[0038] 111: Eleventh Pipeline; 112: Twelfth Pipeline; 113: Thirteenth Pipeline;

[0039] 114: Fourteenth pipe; 115: Fifteenth pipe; 116: New water pipe;

[0040] 117: Wastewater discharge pipe; 118: Water supply pipe. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0042] The following is combined Figure 1 The present invention describes a variable-condition heat pump heating system for industrialized aquaculture, comprising a ground source heat pump unit and a supplementary heating unit.

[0043] The ground source heat pump unit includes a ground source heat pump and a secondary heat exchanger. The secondary heat exchanger has a first passage and a second passage that can exchange heat with each other. The second passage is used to exchange heat with the ground source heat pump, thereby enabling the heating of new water through the ground source heat pump. Specifically, the inlet of the first passage is connected to the new water pipe, and the outlet of the first passage is connected to the inlet of the aquaculture pond 1. In this way, the new water, after being heated by the ground source heat pump unit, can flow into the aquaculture pond 1, realizing water exchange and heating.

[0044] The heating unit includes a heating pipe 10 and a heat exchange pipe. The heating pipe 10 is installed inside the aquaculture tank 1 to heat the water in the tank. Specifically, the heating pipe 10 can be an aluminum alloy pipe laid at the bottom of the aquaculture tank 1. The heat exchange pipe is used to exchange heat with the second passage of the secondary heat exchanger, and the heat exchange pipe and the heating pipe 10 are connected to form a circulation loop through a circulation pipe. This allows for the circulation of the medium in the heating pipe 10 and continuous heating of the water in the aquaculture tank 1, achieving constant-temperature heating. In this way, the medium in the circulation loop is heated to approximately 35°C through the second passage of the secondary heat exchanger, and then the heat is released into the aquaculture tank 1 through the heating pipe 10, achieving water temperature rise and maintenance of a suitable water temperature. Heating the medium through the secondary heat exchanger of the ground source heat pump unit can save energy and reduce operating costs.

[0045] This heating system, configured in this way, uses a ground source heat pump to heat the water for exchange and maintain a constant temperature in the aquaculture water body, meeting the temperature requirements of the aquaculture water. Furthermore, a single system can be used to simultaneously meet the variable operating conditions of water exchange heating and constant temperature replenishment, balancing economic costs and operational control, depending on actual aquaculture needs. This heating system replaces existing water heating solutions, not only saving energy and reducing operating costs but also reducing environmental pollution, resulting in significant economic benefits and aligning with the national strategy of achieving carbon peaking and carbon neutrality.

[0046] In an optional embodiment of the present invention, the heating system further includes a fresh water preheating heat exchanger 4. Fresh water is preheated by recovering waste heat from the tailwater in the fresh water preheating heat exchanger 4, and then further heated by a ground source heat pump unit before entering the aquaculture pond 1. This recovery of waste heat from the tailwater for fresh water preheating helps reduce the selection of a ground source heat pump unit. The fresh water preheating heat exchanger 4 is provided with a first heat exchange passage and a second heat exchange passage. The inlet of the first heat exchange passage is connected to the outlet of the aquaculture pond 1, and the inlet of the second heat exchange passage is connected to a fresh water pipe 116, so that the fresh water and tailwater can exchange heat within the fresh water preheating heat exchanger 4, utilizing the waste heat of the tailwater to preheat the fresh water. In addition, a fresh water pump 22 is installed on the fresh water pipe 116 to facilitate the introduction of fresh water into the second heat exchange passage; a tailwater discharge pipe 117 is provided at the outlet of the first heat exchange passage to facilitate the discharge of tailwater. Specifically, the outlet of the second heat exchange passage is connected to the inlet of the first passage of the secondary heat exchanger, so that fresh water can enter the secondary heat exchanger for heat exchange. The fresh water for aquaculture is preheated to about 13°C in the fresh water preheating heat exchanger 4, and then enters the secondary heat exchanger to be heated to about 30°C again, and then sent to the aquaculture pond 1.

[0047] In an optional embodiment, the second passage of the secondary heat exchanger is connected to the condenser of the ground source heat pump to form a loop, so that the medium in the loop can absorb heat on the condenser side and release heat in the second passage of the secondary heat exchanger, thereby heating the new water in the first passage.

[0048] In addition, the evaporator of the ground source heat pump is equipped with a groundwater inlet for groundwater to enter and a groundwater outlet for groundwater to exit. The evaporator of the ground source heat pump can absorb heat from the groundwater to power the refrigerant evaporation in the evaporator. In this way, the groundwater serves as the heat source for the refrigerant evaporation and heat absorption in the evaporator.

[0049] In an optional embodiment, the heat exchange pipeline can be a first passage, in which the medium in the heat replenishment pipeline 10 is heated by the secondary heat exchanger of the ground source heat pump unit, thereby raising the temperature of the water in the aquaculture pond 1 and maintaining a suitable water temperature.

[0050] A first valve 31 is installed between the outlet of the first passage and the inlet of the aquaculture pond 1. A second valve 32 is installed between the outlet of the first passage and the inlet of the heat exchange pipe 10. A third valve 33 is installed between the inlet of the first passage and the new water pipe (i.e., the outlet of the second heat exchange passage). A fourth valve 34 is installed between the inlet of the first passage and the outlet of the heat exchange pipe 10. The first valve 31, the second valve 32, the third valve 33 and the fourth valve 34 can be switched between closed and open states, so that new water can pass through the first passage or the medium in the heat exchange pipe 10 can pass through the first passage. This allows the heating system to operate in water exchange heating mode or constant temperature heat exchange mode, enabling the heating system to operate under different conditions to meet the needs of different aquaculture stages.

[0051] When the first valve 31 and the third valve 33 are closed and the second valve 32 and the fourth valve 34 are open, the medium in the heat replenishment pipe 10 can flow into the secondary heat exchanger. The second passage of the secondary heat exchanger heats the medium, thereby enabling the heating system to operate under constant temperature heat replenishment conditions.

[0052] When the first valve 31 and the third valve 33 are in the open state and the second valve 32 and the fourth valve 34 are in the closed state, fresh water can flow into the first passage, and the second passage of the secondary heat exchanger heats the fresh water in the first passage, thereby enabling the heating system to operate in the water exchange and heating mode.

[0053] Here, the first valve 31, the second valve 32, the third valve 33, and the fourth valve 34 can all be gate valves.

[0054] In an optional embodiment, the heat replenishment unit further includes a water replenishment device, which includes a water replenishment tank 9 and a water replenishment pressure pump 28. The water replenishment tank 9 contains a medium (which can be water). The inlet of the water replenishment pressure pump 28 is connected to the water replenishment tank 9, and the outlet of the water replenishment pressure pump 28 is connected to the circulation loop to replenish the medium to the heat replenishment pipeline 10. Furthermore, the water replenishment tank 9 and the water replenishment pressure pump 28 are connected through a water replenishment pipeline 118. Water replenishment pump valves 35 are provided between the inlet of the water replenishment pressure pump 28 and the water replenishment tank 9, and between the outlet of the water replenishment pressure pump 28 and the circulation loop, so that the water replenishment tank 9 and the water replenishment pressure pump 28 can replenish the circulation loop with water and maintain pressure according to the set water replenishment amount.

[0055] In addition, two ground source heat pump units can be installed, namely a first ground source heat pump unit and a second ground source heat pump unit. The first ground source heat pump unit includes a first secondary heat exchanger 7 and a first ground source heat pump 5, and the second ground source heat pump unit includes a second secondary heat exchanger 8 and a second ground source heat pump 6. Among them, the first valve 31 is installed between the outlet of the first passage of the second secondary heat exchanger 8 and the inlet of the aquaculture tank 1; the second valve 32 is installed between the outlet of the first passage of the second secondary heat exchanger 8 and the inlet of the heat replenishment pipe 10; the third valve 33 is installed between the inlet of the first passage of the second secondary heat exchanger 8 and the second heat exchange passage; and the fourth valve 34 is installed between the inlet of the first passage of the second secondary heat exchanger 8 and the outlet of the heat replenishment pipe 10. In this way, when the heating system is operating under constant temperature heat replenishment conditions, the medium in the heat replenishment pipe 10 can be heated only through the second ground source heat pump unit.

[0056] The outlet of the second heat exchange passage of the fresh water preheating heat exchanger 4 is connected to the inlet of the first channel of the first and second secondary heat exchangers 7 and 8 via a fourth pipe 104. The outlets of the first channels of both the first and second secondary heat exchangers 7 and 8 are connected to the inlet of the aquaculture pond 1 via a fifth pipe 105. Specifically, the outlets of the first channels of both the first and second secondary heat exchangers 7 and 8 are connected to the inlet of the fifth pipe 105 via connecting pipes. Furthermore, the outlet of the first channel of the second secondary heat exchanger 8 is connected to the inlet of the supplementary heating pipe 10 via a sixth pipe 106, and the inlet of the first channel of the second secondary heat exchanger 8 is connected to the outlet of the supplementary heating pipe 10 via a seventh pipe 107.

[0057] In addition, the first valve 31 is installed on the connecting pipe between the second secondary heat exchanger 8 and the fifth pipe 105 to regulate the opening and closing of the connecting pipe, thereby regulating the connection state between the first passage and the fifth passage of the second secondary heat exchanger 8; the second valve 32 is installed on the sixth pipe 106 to regulate the opening and closing of the sixth pipe 106; the third valve 33 is installed on the fourth pipe 104, and the third valve 33 is located between the inlet of the first passage of the first secondary heat exchanger 7 and the second secondary heat exchanger 8, so that when the third valve 33 is closed, new water cannot flow into the second secondary heat exchanger 8; the fourth valve 34 is installed on the seventh pipe 107 to regulate the opening and closing of the seventh pipe 107, thereby regulating the connection state between the first passage of the second secondary heat exchanger 8 and the heat replenishment pipe 10.

[0058] In addition, a heat replenishment circulation pump 25 is installed on the seventh pipe 107. When operating under constant temperature heat replenishment conditions, the first ground source heat pump 5 is turned off, the second ground source heat pump 6 is turned on, the first valve 31 and the third valve 33 are turned off, the second valve 32 and the fourth valve 34 are turned on, and the heat replenishment circulation pump 25 is turned on. The first passage of the heat replenishment pipe 10 and the second secondary heat exchanger 8 forms a circulation loop through the sixth pipe 106 and the seventh pipe 107. The medium in the circulation loop is heated through the second secondary heat exchanger 8, and then the heat is released into the aquaculture pond 1 through the heat replenishment pipe 10 to achieve water temperature rise and heating.

[0059] In an optional embodiment, the condenser of the first ground source heat pump 5 and the second passage of the first secondary heat exchanger 7 are connected in a loop via the tenth pipe 110 and the eleventh pipe 111. A first circulation pump 26 is installed on the eleventh pipe 111 to facilitate loop circulation. The condenser of the second ground source heat pump 6 and the second passage of the second secondary heat exchanger 8 are connected in a loop via the eighth pipe 108 and the ninth pipe 109. A second circulation pump 27 is installed on the ninth pipe 109 to facilitate loop circulation. Thus, when the first ground source heat pump 5 and the second ground source heat pump 6 are turned on, the two loops achieve circulating heat exchange. The medium in the loop absorbs heat on the condenser side of the first ground source heat pump 5 and the second ground source heat pump 6, and releases heat in the second passage of the first secondary heat exchanger 7 and the second secondary heat exchanger 8.

[0060] In a further embodiment, the ground source heat pump unit also includes a submersible well water pump for raising groundwater. The submersible well water pump is connected to the groundwater inlet of the evaporator of the ground source heat pump, and a cyclone desander is installed between the submersible well water pump and the groundwater inlet of the evaporator to prevent sediment in the groundwater from entering the evaporator of the ground source heat pump. Specifically, the first ground source heat pump unit also includes a first submersible well water pump 23, which is connected to the groundwater inlet of the evaporator of the first ground source heat pump 5 through a fourteenth pipe 114. The groundwater outlet of the evaporator of the first ground source heat pump 5 is also provided with a fifteenth pipe 115 connected to a reinjection well to facilitate the discharge of groundwater from the evaporator. The second ground source heat pump unit also includes a second submersible well water pump 24, which is connected to the groundwater inlet of the second ground source heat pump 6 through a twelfth pipe 112. The groundwater outlet of the second ground source heat pump 6 is also provided with a thirteenth pipe 113 connected to a reinjection well to facilitate the discharge of groundwater from the evaporator. When the first ground source heat pump 5 and the second ground source heat pump 6 are turned on, the groundwater is lifted to the ground by the first well water submersible pump 23 and the second well water submersible pump 24, and enters the evaporator of the first ground source heat pump 5 and the second ground source heat pump 6 to provide a heat source for the heat absorption of the evaporator of the first ground source heat pump 5 and the second ground source heat pump 6, and then discharged into the reinjection well from the fifteenth pipe 115 and the thirteenth pipe 113.

[0061] In an optional embodiment of the present invention, the heating system further includes a wastewater treatment unit to prevent silt and other contaminants in the wastewater from clogging the first heat exchange passage of the fresh water preheating heat exchanger 4. The wastewater treatment unit includes a wastewater sedimentation tank 2 and a wastewater filter 3. The inlet of the wastewater sedimentation tank 2 is connected to the outlet of the aquaculture pond 1, and the inlet of the wastewater filter 3 is connected to the outlet of the wastewater sedimentation tank 2. The outlet of the wastewater filter 3 is connected to the inlet of the first heat exchange passage, so that the wastewater flows into the fresh water preheating heat exchanger 4 after filtration.

[0062] Specifically, the outlet of the aquaculture pond 1 is connected to the inlet of the tailwater sedimentation tank 2 via a first pipe 101. The outlet of the tailwater sedimentation tank 2 is connected to the inlet of the tailwater filter 3 via a second pipe 102. The outlet of the tailwater filter 3 is connected to the inlet of the first heat exchange passage of the fresh water preheating heat exchanger 4 via a third pipe 103. To facilitate the entry of tailwater into the tailwater filter 3, a tailwater pump 21 is installed between the tailwater sedimentation tank 2 and the tailwater filter 3. In this way, the tailwater discharged from the aquaculture pond 1 undergoes multi-stage sedimentation in the tailwater sedimentation tank 2, and then enters the tailwater filter 3 under the action of the tailwater pump 21. After being filtered by the tailwater filter 3, the tailwater enters the first heat exchange passage of the fresh water preheating heat exchanger 4 and is finally discharged from the outlet of the first heat exchange passage.

[0063] In addition, in order to facilitate the recovery of residual heat in the effluent, an insulation layer is installed on the outer wall of the effluent sedimentation tank 2 to prevent the residual heat in the effluent from being released to the outside during the effluent treatment process and thus preventing it from being used to preheat the new water.

[0064] In optional embodiments, the first pipe 101, second pipe 102, third pipe 103, fourth pipe 104, fifth pipe 105, eighth pipe 108, ninth pipe 109, tenth pipe 110, eleventh pipe 111, twelfth pipe 112, thirteenth pipe 113, fourteenth pipe 114, fifteenth pipe 115, new water pipe 116, and tailwater discharge pipe 117 can all be PVC pipes; the sixth pipe 106 and seventh pipe 107 can be aluminum alloy pipes; and the makeup water pipe 118 can be a galvanized steel pipe. Furthermore, in this heating system, except for the makeup heat circulation pump 25 and the makeup water constant pressure pump 28, all other water pumps are fluorinated to prevent scaling and microbial growth, ensuring the purity of the transported medium. In addition, both the new water preheating heat exchanger 4 and the secondary heat exchanger can be titanium plate heat exchangers.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A variable-condition heat pump heating system for factory-scale aquaculture, characterized in that, include: A ground source heat pump unit, comprising a ground source heat pump and a secondary heat exchanger, wherein the secondary heat exchanger is provided with a first passage and a second passage capable of exchanging heat with each other, the second passage being used for heat exchange with the ground source heat pump, the inlet of the first passage being connected to a new water pipe, and the outlet of the first passage being connected to the inlet of an aquaculture pond. The heating unit includes a heating pipe installed in the aquaculture tank and a heat exchange pipe for exchanging heat with a second passage of the secondary heat exchanger. The heat exchange pipe is connected to the heating pipe to form a circulation loop. It also includes a new water preheating heat exchanger for exchanging heat between new water and tailwater. The new water preheating heat exchanger has a first heat exchange passage and a second heat exchange passage. The inlet of the first heat exchange passage is connected to the outlet of the aquaculture tank, the inlet of the second heat exchange passage is connected to the new water pipe, and the outlet of the second heat exchange passage is connected to the first heat exchange passage. The inlets of the pipelines are connected, and the heat exchange pipeline is the first passage. A first valve is installed between the outlet of the first passage and the inlet of the aquaculture pond. A second valve is installed between the outlet of the first passage and the inlet of the heat replenishment pipeline. A third valve is installed between the inlet of the first passage and the new water pipe. A fourth valve is installed between the inlet of the first passage and the outlet of the heat replenishment pipeline. The first valve, the second valve, the third valve, and the fourth valve can be switched between closed and open states, respectively.

2. The variable-condition heat pump heating system for factory-scale aquaculture according to claim 1, characterized in that, The second passage of the secondary heat exchanger is connected to the condenser of the ground source heat pump to form a loop.

3. The variable-condition heat pump heating system for factory-scale aquaculture according to claim 2, characterized in that, The evaporator of the ground source heat pump is equipped with a groundwater inlet for groundwater to enter and a groundwater outlet for groundwater to exit. The evaporator of the ground source heat pump can absorb heat from the groundwater.

4. The variable-condition heat pump heating system for factory-scale aquaculture according to claim 1, characterized in that, The heat exchange unit also includes a water supply device, which includes: Water tank; A water replenishment and pressure regulating pump is provided, wherein the inlet of the water replenishment and pressure regulating pump is connected to the water replenishment tank, and the outlet of the water replenishment and pressure regulating pump is connected to the circulation loop.

5. The variable-condition heat pump heating system for factory-scale aquaculture according to claim 1, characterized in that, The ground source heat pump unit is provided in two units, namely the first ground source heat pump unit and the second ground source heat pump unit.

6. The variable-condition heat pump heating system for factory-scale aquaculture according to claim 5, characterized in that, The heat exchange pipeline is the first passage of the second secondary heat exchanger of the second ground source heat pump unit. The first valve is located between the outlet of the first passage of the second secondary heat exchanger and the inlet of the aquaculture pond. The second valve is located between the outlet of the first passage of the second secondary heat exchanger and the inlet of the heat replenishment pipeline. The third valve is located between the inlet of the first passage of the second secondary heat exchanger and the new water pipe. The fourth valve is located between the inlet of the first passage of the second secondary heat exchanger and the outlet of the heat replenishment pipeline.

7. The variable-condition heat pump heating system for factory-scale aquaculture according to claim 3, characterized in that, The ground source heat pump unit also includes a submersible well pump for lifting groundwater. The submersible well pump is connected to the groundwater inlet, and a cyclone desander is installed between the submersible well pump and the groundwater inlet.

8. The variable-condition heat pump heating system for factory-scale aquaculture according to claim 1, characterized in that, It also includes a tailwater treatment unit, which comprises: A tailwater sedimentation tank, wherein the inlet of the tailwater sedimentation tank is connected to the outlet of the aquaculture pond; The tailwater filter has an inlet that is connected to the outlet of the tailwater sedimentation tank, and an outlet that is connected to the inlet of the first heat exchange passage.

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