A recirculating aquaculture system and method

Abstract

The application provides a circulating aquaculture system and method, which comprises a high-temperature breeding unit, a low-temperature breeding unit and a circulating heat exchange unit. The circulating heat exchange unit comprises a first heat exchange device and a second heat exchange device. The first heat exchange device is provided with a first heat exchange pipeline, and the second heat exchange device is provided with a second heat exchange pipeline. The first heat exchange pipeline and the second heat exchange pipeline circulate heat exchange medium. The first heat exchange device is connected with the high-temperature breeding unit, so that the first waste liquid in the high-temperature breeding unit exchanges heat with the heat exchange medium. The second heat exchange device is connected with the low-temperature breeding unit, so that the second waste liquid in the low-temperature breeding unit exchanges heat with the heat exchange medium in the second heat exchange pipeline. The application can ensure the breeding temperature in different breeding units, improve the heat utilization rate, and avoid the environmental pollution caused by directly discharging waste liquid by recycling waste water.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aquaculture, and relates to a circulating aquaculture system and method. BACKGROUND

[0002] Aquaculture is a process of artificially controlling aquatic plants and animals in water areas available for cultivation (including planting) according to the ecological habits of cultivation objects and the requirements of water area environmental conditions. In the process of aquaculture, a large amount of organic matter such as residual feed, excrement, and biological carcasses will accumulate in the water body, and a large amount of toxic and harmful inorganic matter such as ammonia nitrogen, hydrogen sulfide, and nitrous acid will also accumulate. If the tail water is directly discharged without treatment, it will cause serious environmental pollution. Therefore, it has become a common measure for the existing aquaculture industry to use purification treatment equipment to treat the tail water and then recycle it to the aquaculture process.

[0003] However, as the aquatic plants and animals grow and the environmental temperature changes, the temperature of the cultivation tail water will fluctuate greatly. In order to provide a better cultivation environment for aquatic products, the water temperature of the cultivation pond is usually controlled at a constant temperature. Usually, heating is used to maintain the water temperature and maintain the growth environment of aquatic products. The traditional constant temperature control method for aquaculture directly uses a heater or a cooler to heat or cool the water in the cultivation pond, which has a very high operating cost, greatly compressing the profit space of the cultivator, and also causing the water temperature in the cultivation pond to fluctuate too much, which is not conducive to the cultivation of aquatic products.

[0004] Therefore, there is an urgent need for a new and efficient heating method that can adjust the temperature of the discharged tail water to ensure that the temperature of the tail water recycled to the cultivation water body meets the growth needs of aquatic plants and animals. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application aims to provide a circulating aquaculture system and method that can ensure the cultivation temperature in different cultivation units, promote the growth of aquatic products, and improve the heat utilization rate. At the same time, by recycling waste water, the problem of environmental pollution caused by direct discharge of waste liquid is avoided.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a circulating aquaculture system, which comprises a high-temperature cultivation unit, a low-temperature cultivation unit, and a circulating heat exchange unit. The circulating heat exchange unit comprises a first heat exchange device and a second heat exchange device. The first heat exchange device is provided with a first heat exchange pipeline, and the second heat exchange device is provided with a second heat exchange pipeline. The first heat exchange pipeline is connected to the second heat exchange pipeline in circulation, and a heat exchange medium flows through the first heat exchange pipeline and the second heat exchange pipeline.

[0008] The first heat exchange device is connected to the high-temperature breeding unit in circulation, so that the first waste liquid discharged by the high-temperature breeding unit exchanges heat with the heat exchange medium in the first heat exchange pipeline, and the second heat exchange device is connected to the low-temperature breeding unit in circulation, so that the second waste liquid discharged by the low-temperature breeding unit exchanges heat with the heat exchange medium in the second heat exchange pipeline.

[0009] The present application adopts the high-temperature breeding unit to breed aquatic plants and animals that like high temperature, and adopts the low-temperature breeding unit to breed aquatic plants and animals that like low temperature, so that the breeding of different types of aquatic plants and animals is realized; through the circulation of the heat exchange medium between the first heat exchange pipeline and the second heat exchange pipeline, the first waste liquid discharged in the high-temperature breeding unit is exchanged, the temperature of the first waste liquid is increased, at the same time, the second waste liquid discharged in the low-temperature breeding unit is exchanged, the temperature of the second waste liquid is reduced, and the two are reused respectively, so that the breeding temperature in different breeding units is ensured, the growth of aquatic products is promoted, the heat utilization rate is improved, the temperature control cost is reduced, and environmental pollution caused by direct discharge of waste liquid is avoided.

[0010] As a preferred technical scheme of the present application, the circulating heat exchange unit further comprises an expansion valve and a compression device, the outlet end of the first heat exchange pipeline is connected to the inlet end of the expansion valve, the outlet end of the expansion valve is connected to the inlet end of the second heat exchange pipeline, the outlet end of the second heat exchange pipeline is connected to the inlet end of the compression device, and the outlet end of the compression device is connected to the inlet end of the first heat exchange pipeline.

[0011] In the present application, the high-temperature and high-pressure heat exchange medium discharged by the compression device enters the first heat exchange pipeline, exchanges heat with the first waste liquid and is cooled, obtains low-temperature and high-pressure heat exchange medium, then enters the expansion valve and throttles, obtains low-temperature and low-pressure heat exchange medium, then enters the second heat exchange pipeline and exchanges heat and is heated, obtains high-temperature and low-pressure heat exchange medium, then enters the compression device and is compressed, and then enters the circulation system between the first heat exchange pipeline and the second heat exchange pipeline again.

[0012] Preferably, the first heat exchange device is provided with a first liquid level detection assembly, the first liquid level detection assembly is used for detecting the liquid level of the first waste liquid in the first heat exchange device, the second heat exchange device is provided with a second liquid level detection assembly, and the second liquid level detection assembly is used for detecting the liquid level of the second waste liquid in the second heat exchange device.

[0013] Preferably, the first heat exchange device and the second heat exchange device are further respectively provided with a first temperature measuring assembly and a second temperature measuring assembly, the first temperature measuring assembly is used for detecting the temperature of the first waste liquid in the first heat exchange device, and the second temperature measuring assembly is used for detecting the temperature of the second waste liquid in the second heat exchange device.

[0014] The first heat exchange device and the second heat exchange device in the application can not only play a heat exchange role, but also can accommodate and store the first waste liquid or the second waste liquid, the first liquid level detection assembly is used to detect the liquid level of the first waste liquid in the first heat exchange device, the second liquid level detection assembly is used to detect the liquid level of the second waste liquid in the second heat exchange device, the waste liquid discharge of the high-temperature breeding unit or the low-temperature breeding unit can be adjusted, and the amount of waste liquid entering the high-temperature breeding unit or the low-temperature breeding unit can be adjusted.

[0015] As a preferred technical solution of the application, the high-temperature breeding unit is connected with the inlet end and the outlet end of the first heat exchange device through the first water outlet pipeline and the first water inlet pipeline respectively, so that the first waste liquid enters the first heat exchange device from the first water outlet pipeline, and after heat exchange with the heat exchange medium, the first waste liquid flows back to the high-temperature breeding unit through the first water inlet pipeline.

[0016] Preferably, the first water outlet pipeline is sequentially provided with a first regulating valve and a first circulating pump along the flow direction of the waste liquid.

[0017] Preferably, the first water inlet pipeline is sequentially provided with a third temperature measuring assembly and a third regulating valve along the flow direction of the first waste liquid.

[0018] Preferably, the low-temperature breeding unit is connected with the inlet end and the outlet end of the second heat exchange device through the second water outlet pipeline and the second water inlet pipeline respectively, so that the second waste liquid enters the second heat exchange device from the second water outlet pipeline, and after heat exchange with the heat exchange medium, the second waste liquid flows back to the low-temperature breeding unit through the second water inlet pipeline.

[0019] Preferably, the second water outlet pipeline is sequentially provided with a second regulating valve and a second circulating pump along the flow direction of the waste liquid.

[0020] Preferably, the second water inlet pipeline is sequentially provided with a fourth temperature measuring assembly and a fourth regulating valve along the flow direction of the second waste liquid.

[0021] As a preferred technical solution of the application, the circulating aquaculture system further comprises a purification unit, the inlet end of the purification unit is connected with the outlet end of the high-temperature breeding unit and the low-temperature breeding unit respectively, and the outlet end of the purification unit is connected with the first heat exchange device and the second heat exchange device respectively.

[0022] So that the first waste liquid and the second waste liquid flow into the purification unit for purification treatment and then are discharged into the first heat exchange device and the second heat exchange device respectively.

[0023] Preferably, the purification unit comprises a post-treatment device, a partition plate is arranged in the post-treatment device, and the partition plate divides the post-treatment device into a first purification chamber and a second purification chamber.

[0024] The inlet end and the outlet end of the first purification chamber are connected with the high-temperature aquaculture unit and the first heat exchange device respectively, and the inlet end and the outlet end of the second purification chamber are connected with the low-temperature aquaculture unit and the second heat exchange device respectively.

[0025] Preferably, the first purification chamber and the second purification chamber are independently provided with a first filter chamber, a biochemical treatment chamber and a second filter chamber along the flow direction of the waste liquid.

[0026] The first waste liquid and the second waste liquid in the application need to be discharged after purification treatment, so as to avoid the accumulation of particulate matter and suspended matter in the water body, causing pipeline system to be blocked or damaged. After the first waste liquid and the second waste liquid pass through the first filter chamber to filter out the larger particulate matter and suspended matter in the water body, they enter the biochemical chamber, are purified through the biochemical action of adsorption, oxidation and absorption of microorganisms, and then flow into the second filter chamber to filter out the remaining agglomerates, suspended matter and excrement of microorganisms, so as to meet the reuse requirements.

[0027] As a preferred technical solution of the application, the first heat exchange device and the second heat exchange device are respectively sleeved with a first heat preservation layer and a second heat preservation layer.

[0028] Preferably, the circulating heat exchange unit further comprises an auxiliary heating module and an auxiliary cooling module, the auxiliary heating module is used for heating the inside of the first heat preservation layer, and the auxiliary cooling module is used for cooling the inside of the second heat preservation layer.

[0029] In the application, the first heat preservation layer is used to preserve the heat of the first waste liquid in the first heat exchange device, so as to avoid heat loss and ensure that the temperature of the waste water flowing back to the high-temperature aquaculture unit is constant. The second heat preservation layer is used to preserve the heat of the second waste liquid in the second heat exchange device, so as to ensure that the second waste liquid is at a lower temperature. When the circulating action of the heat exchange medium cannot reach the required temperature, the auxiliary heating module can be used to heat the first waste liquid in the first heat exchange device, and the auxiliary cooling module can be used to cool the second waste liquid in the second heat exchange device, so as to ensure that the temperature of the waste liquid flowing back to the aquaculture unit meets the environmental temperature required for the growth of aquatic plants and animals.

[0030] It should be noted that the application does not make specific limitations on the auxiliary heating module and the auxiliary cooling module. The heating module or the cooling module known to those skilled in the art can be used, for example, the heating module can use a heater or an air source heat pump; the cooling module can use a condenser or a refrigeration device. Of course, it can be understood that other styles of heating modules or cooling modules that can heat or cool the waste liquid also fall within the protection scope and disclosure scope of the application, so other forms of heating modules or cooling modules disclosed in the prior art or not disclosed in new technologies can also be used in the application.

[0031] As a preferred technical solution of the present application, the circulating aquaculture system further comprises a control unit, which is electrically connected with the high-temperature aquaculture unit, the low-temperature aquaculture unit and the circulating heat exchange unit respectively.

[0032] Preferably, the control unit is electrically connected with the first temperature measuring assembly, the second temperature measuring assembly, the first circulating pump and the second circulating pump respectively.

[0033] Preferably, the control unit is electrically connected with the first liquid level detecting assembly, the second liquid level detecting assembly, the third regulating valve and the fourth regulating valve respectively.

[0034] In the second aspect, the present application provides a circulating aquaculture method, which is performed by using the circulating aquaculture system of the first aspect, and comprises the following steps:

[0035] (I) discharging the first waste liquid discharged from the high-temperature aquaculture unit into the first heat exchange device, and discharging the second waste liquid discharged from the low-temperature aquaculture unit into the second heat exchange device;

[0036] (II) performing primary heat exchange between the first waste liquid and the heat exchange medium in the first heat exchange pipeline to obtain high-temperature waste liquid, and flowing the heat exchange medium after the primary heat exchange into the second heat exchange pipeline to perform secondary heat exchange with the second waste liquid to obtain low-temperature waste liquid;

[0037] (III) flowing the high-temperature waste liquid back to the high-temperature aquaculture unit, flowing the low-temperature waste liquid back to the low-temperature aquaculture unit, and flowing the heat exchange medium after the secondary heat exchange into the first heat exchange pipeline to circulate.

[0038] As a preferred technical solution of the present application, in step (I), the first waste liquid and the second waste liquid are independently subjected to purification treatment before being discharged into the first heat exchange device and the second heat exchange device respectively.

[0039] Preferably, the purification treatment comprises sequentially performing primary filtration treatment, biochemical treatment and secondary filtration treatment on the first waste liquid or the second waste liquid.

[0040] It should be noted that the method of the primary filtration treatment, the biochemical treatment and the secondary filtration treatment is not specifically limited, and any technical means known to those skilled in the art can be used. The method of the primary filtration treatment and the secondary filtration treatment can be the same or different. For example, the primary filtration treatment and the secondary filtration treatment can both use the filter screen interception method, and the biochemical treatment can use aerobic purification or anaerobic purification treatment, etc.

[0041] As a preferred technical scheme of the present application, in step (II), the heat exchange medium after the first heat exchange flows into the second heat exchange pipeline for the second heat exchange after throttling by the expansion valve, the heat exchange medium after the second heat exchange is sent to the compression device for compression, and the compressed heat exchange medium flows back to the first heat exchange pipeline.

[0042] In the present application, the high-temperature and high-pressure heat exchange medium discharged from the compression device enters the first heat exchange pipeline, exchanges heat with the first waste liquid to reduce the temperature, obtains low-temperature and high-pressure heat exchange medium, then throttles in the expansion valve to obtain low-temperature and low-pressure heat exchange medium, and then enters the second heat exchange pipeline for heat exchange to increase the temperature, obtains high-temperature and low-pressure heat exchange medium, and then enters the compression device for compression, and then enters the circulating system between the first heat exchange pipeline and the second heat exchange pipeline.

[0043] As a preferred technical scheme of the present application, in step (III), the first temperature data of the high-temperature waste liquid and the second temperature data of the low-temperature waste liquid are collected by the third temperature measuring assembly and the fourth temperature measuring assembly respectively, and are transmitted to the control unit, and the control unit respectively and independently feeds back the first circulating pump, the second circulating pump, the third regulating valve and the fourth regulating valve according to the first temperature data and the second temperature data.

[0044] Preferably, the first liquid level data of the first heat exchange device and the second liquid level data of the second heat exchange device are collected by the first liquid level detection assembly and the second liquid level detection assembly respectively, and are transmitted to the control unit, and the control unit respectively and independently feeds back the first circulating pump, the second circulating pump, the third regulating valve and the fourth regulating valve according to the first liquid level data and the second liquid level data.

[0045] In order to help those skilled in the art better understand the overall technical scheme and working process of the present application, the present application exemplarily provides the specific control logic of the control unit as follows:

[0046] (1) The control unit receives the first temperature data of the high-temperature waste liquid entering the high-temperature breeding module collected by the first temperature measuring assembly, when the first temperature data is lower than the temperature required for the growth of aquatic animals and plants in the high-temperature breeding module, the control unit feeds back the opening degree of the first circulating pump to reduce, closes the third regulating valve, stores the first waste liquid in the first heat exchange device, continuously exchanges heat with the heat exchange medium, and adjusts the opening degree of the first circulating pump according to the temperature in the first heat exchange device collected by the third temperature measuring assembly and the liquid level of the first waste liquid collected by the first liquid level detection assembly, when the temperature in the first heat exchange device reaches the required temperature condition, the high-temperature waste liquid in the first heat exchange device is sent into the high-temperature breeding module by opening the third regulating valve;

[0047] (2) the control unit receives second temperature data of the low-temperature waste liquid entering the low-temperature aquaculture module collected by the second temperature measuring assembly, when the second temperature data is higher than the temperature required for the aquatic plants and animals to grow in the low-temperature aquaculture module, the control unit feeds back to control the opening degree of the second circulating pump to be reduced, the fourth regulating valve is closed, the second waste liquid is stored in the second heat exchange device, the heat exchange is continuously performed by using the heat exchange medium, and when the temperature in the second heat exchange device reaches the required temperature condition, the opening degree of the second circulating pump is adjusted, the fourth regulating valve is opened, and the low-temperature waste liquid in the second heat exchange device is sent into the low-temperature aquaculture module;

[0048] (3) when the circulation of the heat exchange medium cannot reach the required temperature requirement, the control unit electrically controls to open the auxiliary heating module to heat the first waste liquid in the first heat exchange device, and / or the auxiliary cooling module is used to cool the second waste liquid in the second heat exchange device, and according to the data of the first temperature measuring assembly and the second temperature measuring assembly, the auxiliary heating module and / or the auxiliary cooling module are controlled to be closed.

[0049] The system refers to a device system, a device system or a production device.

[0050] Compared with the prior art, the beneficial effects of the present application are:

[0051] The present application provides a kind of circulating aquaculture system and method, adopt high-temperature aquaculture unit breeding like high temperature aquatic plants and animals, low-temperature aquaculture unit breeding like low temperature aquatic plants and animals, realize the breeding of different kinds of aquatic plants and animals;Through the circulation flow of heat exchange medium between first heat exchange pipeline and second heat exchange pipeline, the first waste liquid discharged in high-temperature aquaculture unit is carried out, the temperature of first waste liquid is improved, while the heat exchange of second waste liquid discharged in low-temperature aquaculture unit is carried out, the temperature of second waste liquid is reduced, and is recycled respectively, ensure the breeding temperature in different aquaculture units, promote the growth of aquatic products, improve heat utilization rate, it is favorable for reducing temperature control cost, at the same time, it can avoid the environmental pollution caused by directly discharging waste liquid. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 The structure schematic view of the circulating aquaculture system provided for an embodiment of the present application is shown in the figure;

[0053] Figure 2 The structure schematic view of the circulating aquaculture system provided for an embodiment of the present application is shown in the figure;

[0054] Wherein, 1-high temperature breeding unit; 2-low temperature breeding unit; 3-first heat exchange device; 4-second heat exchange device; 5-first heat exchange pipeline; 6-second heat exchange pipeline; 7-expansion valve; 8-compression device; 9-first liquid level detection assembly; 10-second liquid level detection assembly; 11-control unit; 12-first water outlet pipeline; 13-first water inlet pipeline; 14-first regulating valve; 15-first circulating pump; 16-second water outlet pipeline; 17-second water inlet pipeline; 18-second regulating valve; 19-second circulating pump; 20-first temperature measurement assembly; 21-second temperature measurement assembly; 22-third temperature measurement assembly; 23-fourth temperature measurement assembly; 24-third regulating valve; 25-fourth regulating valve; 26-purification unit; 27-post-processing device; 28-baffle; 29-first purification chamber; 30-second purification chamber; 31-first heat preservation layer; 32-second heat preservation layer; 33-assisted heating module; 34-assisted cooling module. DETAILED DESCRIPTION

[0055] It should be understood that, in the description of the present application, the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0056] It should be noted that, in the description of the present application, unless otherwise specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] Those skilled in the art should understand that the present application must include necessary pipelines, conventional valves and general pump equipment for realizing the complete process, but the above content does not belong to the main point of the present application, those skilled in the art can add layout on their own based on the process flow and equipment structure selection, and the present application does not make special requirements and specific limitations on this.

[0058] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0059] In one specific embodiment, the present invention provides a recirculating aquaculture system, such as... Figure 1 As shown, the system includes a high-temperature aquaculture unit 1, a low-temperature aquaculture unit 2, and a circulating heat exchange unit. The circulating heat exchange unit includes a first heat exchange device 3 and a second heat exchange device 4. The first heat exchange device 3 has a first heat exchange pipe 5, and the second heat exchange device 4 has a second heat exchange pipe 6. The first heat exchange pipe 5 is circulatedly connected to the second heat exchange pipe 6, and a heat exchange medium flows through both the first heat exchange pipe 5 and the second heat exchange pipe 6.

[0060] The first heat exchange device 3 is circulatedly connected to the high-temperature aquaculture unit 1, so that the first waste liquid discharged by the high-temperature aquaculture unit 1 exchanges heat with the heat exchange medium in the first heat exchange pipe 5. The second heat exchange device 4 is circulatedly connected to the low-temperature aquaculture unit 2, so that the second waste liquid discharged by the low-temperature aquaculture unit 2 exchanges heat with the heat exchange medium in the second heat exchange pipe 6.

[0061] In some embodiments, the circulating heat exchange unit further includes an expansion valve 7 and a compression device 8. The outlet end of the first heat exchange pipe 5 is connected to the inlet end of the expansion valve 7, the outlet end of the expansion valve 7 is connected to the inlet end of the second heat exchange pipe 6, the outlet end of the second heat exchange pipe 6 is connected to the inlet end of the compression device 8, and the outlet end of the compression device 8 is connected to the inlet end of the first heat exchange pipe 5. In this invention, the high-temperature and high-pressure heat exchange medium discharged from the compression device 8 enters the first heat exchange pipe 5, exchanges heat with the first waste liquid to cool it down, and obtains a low-temperature and high-pressure heat exchange medium. Then, it enters the expansion valve 7 for throttling to obtain a low-temperature and low-pressure heat exchange medium, then enters the second heat exchange pipe 6 for heat exchange to raise its temperature, and obtains a high-temperature and low-pressure heat exchange medium. Finally, it enters the compression device 8 for compression and re-enters the circulation system between the first heat exchange pipe 5 and the second heat exchange pipe 6.

[0062] In some embodiments, the first heat exchange device 3 is provided with a first liquid level detection assembly 9 for detecting the liquid level of the first waste liquid in the first heat exchange device 3, and the second heat exchange device 4 is provided with a second liquid level detection assembly 10 for detecting the liquid level of the second waste liquid in the second heat exchange device 4. The first heat exchange device 3 and the second heat exchange device 4 are further respectively provided with a first temperature detection assembly 20 and a second temperature detection assembly 21, the first temperature detection assembly 20 is used for detecting the temperature of the first waste liquid in the first heat exchange device 3, and the second temperature detection assembly 21 is used for detecting the temperature of the second waste liquid in the second heat exchange device 4. In the present application, the first heat exchange device 3 and the second heat exchange device 4 not only have the function of heat exchange, but also can contain and store the first waste liquid or the second waste liquid. By detecting the liquid level of the first waste liquid in the first heat exchange device 3 by the first liquid level detection assembly 9 and detecting the liquid level of the second waste liquid in the second heat exchange device 4 by the second liquid level detection assembly 10, the waste liquid discharge amount of the high-temperature aquaculture unit 1 or the low-temperature aquaculture unit 2 can be adjusted, and the amount of waste liquid entering the high-temperature aquaculture unit 1 or the low-temperature aquaculture unit 2 can be adjusted.

[0063] In some embodiments, the high-temperature aquaculture unit 1 is connected to the inlet end and the outlet end of the first heat exchange device 3 through a first water outlet pipe 12 and a first water inlet pipe 13, respectively, so that the first waste liquid enters the first heat exchange device 3 through the first water outlet pipe 12, exchanges heat with the heat exchange medium, and then flows back to the high-temperature aquaculture unit 1 through the first water inlet pipe 13. The first water outlet pipe 12 is provided with a first regulating valve 14 and a first circulating pump 15 in sequence along the flow direction of the waste liquid. The first water inlet pipe 13 is provided with a third temperature detection assembly 22 and a third regulating valve 24 in sequence along the flow direction of the first waste liquid.

[0064] In some embodiments, the low-temperature aquaculture unit 2 is connected to the inlet end and the outlet end of the second heat exchange device 4 through a second water outlet pipe 16 and a second water inlet pipe 17, respectively, so that the second waste liquid enters the second heat exchange device 4 through the second water outlet pipe 16, exchanges heat with the heat exchange medium, and then flows back to the low-temperature aquaculture unit 2 through the second water inlet pipe 17. The second water outlet pipe 16 is provided with a second regulating valve 18 and a second circulating pump 19 in sequence along the flow direction of the waste liquid. The second water inlet pipe 17 is provided with a fourth temperature detection assembly 23 and a fourth regulating valve 25 in sequence along the flow direction of the second waste liquid.

[0065] In some embodiments, the recirculating aquaculture system further includes a purification unit 26. The inlet of the purification unit 26 is connected to the outlets of the high-temperature aquaculture unit 1 and the low-temperature aquaculture unit 2, respectively. The outlet of the purification unit 26 is connected to the first heat exchanger 3 and the second heat exchanger 4, respectively, so that the first waste liquid and the second waste liquid flow into the purification unit 26 for purification treatment and are then discharged into the first heat exchanger 3 and the second heat exchanger 4, respectively. The purification unit 26 includes a post-treatment device 27, which is equipped with a partition 28 that divides the post-treatment device 27 into a first purification chamber 29 and a second purification chamber 30. The inlet and outlet of the first purification chamber 29 are connected to the high-temperature aquaculture unit 1 and the first heat exchanger 3, respectively, and the inlet and outlet of the second purification chamber 30 are connected to the low-temperature aquaculture unit 2 and the second heat exchanger 4, respectively.

[0066] In some embodiments, the first purification chamber 29 and the second purification chamber 30 are independently equipped with a first filtration chamber, a biochemical treatment chamber, and a second filtration chamber along the waste liquid flow direction. The first and second waste liquids in this invention need to be purified before discharge to prevent the accumulation of particulate matter and suspended solids in the water, which could cause blockage or damage to the pipeline system. After passing through the first filtration chamber to remove larger particulate matter and suspended solids, the first and second waste liquids enter the biochemical chamber, where they are purified through the adsorption, oxidation, and absorption of microorganisms. They then flow into the second filtration chamber to remove remaining aggregates, suspended solids, and microbial excrement, thus meeting the requirements for reuse.

[0067] In some implementations, such as Figure 2 As shown, the first heat exchange device 3 and the second heat exchange device 4 are respectively fitted with a first insulation layer 31 and a second insulation layer 32 on their outer peripheries. The circulating heat exchange unit also includes an auxiliary heating module 33 and an auxiliary cooling module 34. The auxiliary heating module 33 is used to heat the interior of the first insulation layer 31, and the auxiliary cooling module 34 is used to cool the interior of the second insulation layer 32. In this invention, the first insulation layer 31 is used to keep the first waste liquid in the first heat exchange device 3 warm, to prevent heat loss, and to ensure that the temperature of the wastewater returning to the high-temperature aquaculture unit 1 is constant; the second insulation layer 32 is used to keep the second waste liquid in the second heat exchange device 4 warm, to ensure that the second waste liquid is at a lower temperature. When the circulation of the heat exchange medium cannot reach the required temperature, the auxiliary heating module 33 can be used to heat the first waste liquid in the first heat exchange device 3, and the auxiliary cooling module 34 can be used to cool the second waste liquid in the second heat exchange device 4, to ensure that the temperature of the waste liquid returning to the aquaculture unit meets the environmental temperature required for the growth of aquatic plants and animals.

[0068] The application is not limited to the auxiliary heating module 33 and the auxiliary cooling module 34, and any heating module or cooling module known to those skilled in the art can be used. For example, the heating module can be a heater or an air source heat pump; and the cooling module can be a condenser or a refrigeration device.

[0069] In some embodiments, the circulating aquaculture system further comprises a control unit 11 electrically connected to the high-temperature aquaculture unit 1, the low-temperature aquaculture unit 2, and the circulating heat exchange unit. The control unit 11 is electrically connected to the first temperature measuring assembly 20, the second temperature measuring assembly 21, the first circulating pump 15, the second circulating pump 19, the first liquid level detecting assembly 9, the second liquid level detecting assembly 10, the third regulating valve 24, and the fourth regulating valve 25.

[0070] In another specific embodiment, the application provides a circulating aquaculture method using the circulating aquaculture system described in the specific embodiment for aquaculture. The circulating aquaculture method comprises:

[0071] (1) discharging the first waste liquid from the high-temperature aquaculture unit 1 into the first heat exchange device 3, and discharging the second waste liquid from the low-temperature aquaculture unit 2 into the second heat exchange device 4;

[0072] (2) performing primary heat exchange between the first waste liquid and the heat exchange medium in the first heat exchange pipeline 5 to obtain high-temperature waste liquid, and flowing the heat exchange medium after primary heat exchange into the second heat exchange pipeline 6 to perform secondary heat exchange with the second waste liquid to obtain low-temperature waste liquid;

[0073] (3) flowing the high-temperature waste liquid back to the high-temperature aquaculture unit 1, flowing the low-temperature waste liquid back to the low-temperature aquaculture unit 2, and flowing the heat exchange medium after secondary heat exchange into the first heat exchange pipeline 5 to circulate.

[0074] In some embodiments, after the first waste liquid and the second waste liquid are independently subjected to purification treatment in step (1), they are discharged into the first heat exchange device 3 and the second heat exchange device 4, respectively. The purification treatment comprises sequentially performing primary filtration treatment, biochemical treatment, and secondary filtration treatment on the first waste liquid or the second waste liquid. The application is not limited to the methods of primary filtration treatment, biochemical treatment, and secondary filtration treatment, and any technical means known to those skilled in the art can be used. The methods of primary filtration treatment and secondary filtration treatment can be the same or different. For example, both the primary filtration treatment and the secondary filtration treatment can use the filter screen interception method, and the biochemical treatment can use aerobic purification or anaerobic purification treatment, etc.

[0075] In some embodiments, in step (2), the heat exchange medium after the first heat exchange is throttled by the expansion valve 7 and flows into the second heat exchange pipeline 6 for the second heat exchange, the heat exchange medium after the second heat exchange is sent to the compression device 8 for compression, and the compressed heat exchange medium flows back to the first heat exchange pipeline 5.

[0076] In some embodiments, in step (3), the first temperature data of the high-temperature waste liquid and the second temperature data of the low-temperature waste liquid are collected by the third temperature measuring assembly 22 and the fourth temperature measuring assembly 23 respectively and transmitted to the control unit 11, and the control unit 11 respectively and independently feeds back the control of the first circulating pump 15, the second circulating pump 19, the third adjusting valve 24 and the fourth adjusting valve 25 according to the first temperature data and the second temperature data.

[0077] In some embodiments, the first liquid level data of the first heat exchange device 3 and the second liquid level data of the second heat exchange device 4 are collected by the first liquid level detection assembly 9 and the second liquid level detection assembly 10 respectively and transmitted to the control unit 11, and the control unit 11 respectively and independently feeds back the control of the first circulating pump 15, the second circulating pump 19, the third adjusting valve 24 and the fourth adjusting valve 25 according to the first liquid level data and the second liquid level data.

[0078] In order to help those skilled in the art better understand the overall technical solution and working process of the present application, the present application exemplarily provides the specific control logic of the control unit 11 as follows:

[0079] (1) The control unit 11 receives the first temperature data of the high-temperature waste liquid entering the high-temperature breeding module collected by the first temperature measuring assembly 20, when the first temperature data is lower than the temperature required for the growth of aquatic animals and plants in the high-temperature breeding module, the control unit 11 feeds back the control of the opening degree of the first circulating pump 15 to be reduced, the third adjusting valve 24 is closed, the first waste liquid is stored in the first heat exchange device 3, the heat exchange is continuously used by the heat exchange medium, and according to the temperature in the first heat exchange device 3 collected by the third temperature measuring assembly 22 and the liquid level of the first waste liquid collected by the first liquid level detection assembly 9, when the temperature in the first heat exchange device 3 reaches the required temperature condition, the opening degree of the first circulating pump 15 is adjusted, the third adjusting valve 24 is opened, and the high-temperature waste liquid in the first heat exchange device 3 is sent into the high-temperature breeding module;

[0080] (2) the control unit 11 receives the second temperature data of the low-temperature waste liquid entering the low-temperature aquaculture module collected by the second temperature measuring assembly 21, when the second temperature data is higher than the temperature required for the growth of aquatic plants and animals in the low-temperature aquaculture module, the control unit 11 feeds back to control the opening degree of the second circulating pump 19 to be reduced, the fourth adjusting valve 25 is closed, the second waste liquid is stored in the second heat exchange device 4, the heat exchange is continued by using the heat exchange medium, and according to the temperature in the second heat exchange device 4 collected by the fourth temperature measuring assembly 23 and the liquid level of the second waste liquid collected by the second liquid level detecting assembly 10, when the temperature in the second heat exchange device 4 reaches the required temperature condition, the opening degree of the second circulating pump 19 is adjusted, the fourth adjusting valve 25 is opened, and the low-temperature waste liquid in the second heat exchange device 4 is sent into the low-temperature aquaculture module;

[0081] (3) when the circulation of the heat exchange medium cannot reach the required temperature requirement, the control unit 11 electrically controls to open the auxiliary heating module 33 to heat the first waste liquid in the first heat exchange device 3, and / or uses the auxiliary cooling module 34 to cool the second waste liquid in the second heat exchange device 4, and according to the data of the first temperature measuring assembly 20 and the second temperature measuring assembly 21, the auxiliary heating module 33 and / or the auxiliary cooling module 34 are controlled to be closed.

[0082] The present application adopts the high-temperature aquaculture unit 1 to breed aquatic plants and animals that like high temperature, and the low-temperature aquaculture unit 2 to breed aquatic plants and animals that like low temperature, so that different types of aquatic plants and animals can be bred; through the circulation flow of the heat exchange medium between the first heat exchange pipeline 5 and the second heat exchange pipeline 6, the first waste liquid discharged from the high-temperature aquaculture unit 1 is heated to improve the temperature of the first waste liquid, and the second waste liquid discharged from the low-temperature aquaculture unit 2 is heat-exchanged to reduce the temperature of the second waste liquid, and is recycled respectively, so as to ensure the breeding temperature in different aquaculture units, promote the growth of aquatic products, improve the heat utilization rate, reduce the temperature control cost, and avoid environmental pollution caused by direct discharge of waste liquid.

[0083] The applicant declares that the above-mentioned is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, and the skilled person in the art should understand that any change or replacement within the technical range disclosed by the present application can be easily thought by any person skilled in the art, which falls within the protection scope and disclosure range of the present application.

Claims

1. A recirculating aquaculture system, characterized in that, The recirculating aquaculture system includes a high-temperature aquaculture unit, a low-temperature aquaculture unit, and a circulating heat exchange unit. The circulating heat exchange unit includes a first heat exchange device and a second heat exchange device. The first heat exchange device is provided with a first heat exchange pipe, and the second heat exchange device is provided with a second heat exchange pipe. The first heat exchange pipe is circulatedly connected to the second heat exchange pipe, and a heat exchange medium flows in the first heat exchange pipe and the second heat exchange pipe. The outer periphery of the first heat exchanger and the second heat exchanger is respectively covered with a first insulation layer and a second insulation layer; The circulating heat exchange unit further includes an auxiliary heating module and an auxiliary cooling module. The auxiliary heating module is used to heat the interior of the first insulation layer, and the auxiliary cooling module is used to cool the interior of the second insulation layer. The first heat exchange device is circulatedly connected to the high-temperature aquaculture unit, so that the first waste liquid discharged by the high-temperature aquaculture unit exchanges heat with the heat exchange medium in the first heat exchange pipe. The second heat exchange device is circulatedly connected to the low-temperature aquaculture unit, so that the second waste liquid discharged by the low-temperature aquaculture unit exchanges heat with the heat exchange medium in the second heat exchange pipe.

2. The recirculating aquaculture system according to claim 1, characterized in that, The circulating heat exchange unit further includes an expansion valve and a compression device. The outlet end of the first heat exchange pipe is connected to the inlet end of the expansion valve, the outlet end of the expansion valve is connected to the inlet end of the second heat exchange pipe, the outlet end of the second heat exchange pipe is connected to the inlet end of the compression device, and the outlet end of the compression device is connected to the inlet end of the first heat exchange pipe.

3. The recirculating aquaculture system according to claim 1, characterized in that, The first heat exchange device is equipped with a first liquid level detection component, which is used to detect the liquid level of the first waste liquid in the first heat exchange device. The second heat exchange device is equipped with a second liquid level detection component, which is used to detect the liquid level of the second waste liquid in the second heat exchange device.

4. The recirculating aquaculture system according to claim 3, characterized in that, The outer peripheral walls of the first heat exchanger and the second heat exchanger are respectively provided with a first temperature measuring component and a second temperature measuring component. The first temperature measuring component is used to detect the temperature of the first waste liquid in the first heat exchanger, and the second temperature measuring component is used to detect the temperature of the second waste liquid in the second heat exchanger.

5. The recirculating aquaculture system according to claim 4, characterized in that, The high-temperature aquaculture unit is connected to the inlet and outlet of the first heat exchange device through the first outlet pipe and the first inlet pipe, respectively, so that the first waste liquid enters the first heat exchange device through the first outlet pipe, exchanges heat with the heat exchange medium, and then flows back to the high-temperature aquaculture unit through the first inlet pipe.

6. The recirculating aquaculture system according to claim 5, characterized in that, A first regulating valve and a first circulating pump are sequentially installed on the first outlet pipe along the flow direction of the first waste liquid.

7. The recirculating aquaculture system according to claim 6, characterized in that, A third temperature measuring component and a third regulating valve are sequentially installed on the first water inlet pipe along the flow direction of the first waste liquid.

8. The recirculating aquaculture system according to claim 7, characterized in that, The low-temperature aquaculture unit is connected to the inlet and outlet of the second heat exchange device through the second outlet pipe and the second inlet pipe, respectively, so that the second waste liquid enters the second heat exchange device through the second outlet pipe, exchanges heat with the heat exchange medium, and then flows back to the low-temperature aquaculture unit through the second inlet pipe.

9. The recirculating aquaculture system according to claim 8, characterized in that, A second regulating valve and a second circulating pump are sequentially installed on the second outlet pipe along the flow direction of the second waste liquid.

10. The recirculating aquaculture system according to claim 9, characterized in that, A fourth temperature measuring component and a fourth regulating valve are sequentially installed on the second water inlet pipe along the flow direction of the second waste liquid.

11. The recirculating aquaculture system according to claim 10, characterized in that, The recirculating aquaculture system further includes a purification unit. The inlet of the purification unit is connected to the outlet of the high-temperature aquaculture unit and the low-temperature aquaculture unit, respectively. The outlet of the purification unit is connected to the first heat exchange device and the second heat exchange device, respectively. The first waste liquid and the second waste liquid flow into the purification unit for purification treatment and then are discharged into the first heat exchange device and the second heat exchange device respectively.

12. The recirculating aquaculture system according to claim 11, characterized in that, The purification unit includes a post-treatment device, and a partition is provided inside the post-treatment device, which divides the post-treatment device into a first purification chamber and a second purification chamber. The inlet and outlet of the first purification chamber are respectively connected to the high-temperature aquaculture unit and the first heat exchange device, and the inlet and outlet of the second purification chamber are respectively connected to the low-temperature aquaculture unit and the second heat exchange device.

13. The recirculating aquaculture system according to claim 12, characterized in that, The first purification chamber and the second purification chamber are each equipped with a first filtration chamber, a biochemical treatment chamber, and a second filtration chamber, which are independently arranged along the direction of waste liquid flow.

14. The recirculating aquaculture system according to claim 10, characterized in that, The recirculating aquaculture system also includes a control unit, which is electrically connected to the high-temperature aquaculture unit, the low-temperature aquaculture unit, and the circulating heat exchange unit.

15. The recirculating aquaculture system according to claim 14, characterized in that, The control unit is electrically connected to the first temperature measuring component, the second temperature measuring component, the third temperature measuring component and the fourth temperature measuring component respectively.

16. The recirculating aquaculture system according to claim 14, characterized in that, The control unit is electrically connected to the first circulation pump and the second circulation pump respectively.

17. The recirculating aquaculture system according to claim 14, characterized in that, The control unit is electrically connected to the first liquid level detection component, the second liquid level detection component, the third regulating valve, and the fourth regulating valve, respectively.

18. A recirculating aquaculture method, characterized in that, The recirculating aquaculture method described above uses the recirculating aquaculture system according to any one of claims 10-17 for aquaculture, and the steps of the recirculating aquaculture method include: (I) The first waste liquid discharged from the high-temperature aquaculture unit is discharged into the first heat exchange device, and the second waste liquid discharged from the low-temperature aquaculture unit is discharged into the second heat exchange device. (II) The first waste liquid undergoes a heat exchange with the heat exchange medium in the first heat exchange pipe to obtain a high-temperature waste liquid. The heat exchange medium after the first heat exchange flows into the second heat exchange pipe and undergoes a second heat exchange with the second waste liquid to obtain a low-temperature waste liquid. (III) The high-temperature waste liquid is returned to the high-temperature aquaculture unit, and the low-temperature waste liquid is returned to the low-temperature aquaculture unit. The heat exchange medium after secondary heat exchange flows into the first heat exchange pipe, thus circulating in a cycle.

19. The recirculating aquaculture method according to claim 18, characterized in that, In step (I), the first waste liquid and the second waste liquid are purified independently and then discharged into the first heat exchange device and the second heat exchange device, respectively.

20. The recirculating aquaculture method according to claim 19, characterized in that, The purification process includes sequentially performing a first filtration, a biochemical treatment, and a second filtration on the first or second waste liquid.

21. The recirculating aquaculture method according to claim 18, characterized in that, In step (II), the heat exchange medium after the first heat exchange is throttled by the expansion valve and flows into the second heat exchange pipe for secondary heat exchange. The heat exchange medium after the secondary heat exchange is sent to the compression device for compression. The compressed heat exchange medium flows back into the first heat exchange pipe.

22. The recirculating aquaculture method according to claim 18, characterized in that, In step (III), the first temperature data of the high-temperature waste liquid and the second temperature data of the low-temperature waste liquid are collected by the third temperature measuring component and the fourth temperature measuring component, respectively, and transmitted to the control unit. The control unit independently controls the first circulation pump, the second circulation pump, the third regulating valve and the fourth regulating valve based on the first temperature data and the second temperature data.

23. The recirculating aquaculture method according to claim 22, characterized in that, The first liquid level detection component and the second liquid level detection component respectively collect the first liquid level data of the first heat exchange device and the second liquid level data of the second heat exchange device, and transmit them to the control unit. The control unit independently controls the first circulating pump, the second circulating pump, the third regulating valve and the fourth regulating valve based on the first liquid level data and the second liquid level data.

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