Air-conditioning fermentation circulation system and air-conditioning system

Abstract

The invention provides an air-conditioning fermentation circulation system and an air-conditioning system. The air-conditioning fermentation circulation system comprises an air-conditioning device and a refrigerant circulation loop, and the refrigerant circulation loop comprises a condenser; the fermentation system comprises a fermenter and a power generation system, and biogas produced by the fermenter is used by the power generation system; the condenser exchanges heat with liquid in the fermenter; and electricity generated by the power generation system is supplied to the air conditioning device for use. The fermentation liquid is heated through the condenser of the air conditioning system, so that the gas production rate of fermentation is increased, and the produced biogas is used for generating power and can be supplied to the air conditioning device, which is equivalent to effective utilization of waste heat of the air conditioning system.

Description

Technical Field

[0001] The present application belongs to the technical field of air-conditioning systems, and specifically relates to an air-conditioning fermentation circulation system and an air-conditioning system. Background Art

[0002] Air conditioners are the most power-consuming devices in daily life. In order to save energy and electricity, new energy air conditioners have always been a hot topic of research. New energy air conditioners mainly include using new energy power generation technology to power air conditioners, or directly using new energy heating or cooling to adjust indoor temperature.

[0003] Biomass is a renewable resource. The active and effective use of biomass resources plays an important role in reducing carbon dioxide emissions and delaying global warming. Biogas obtained from anaerobic fermentation of biomass is a clean and green energy source. It can be used as a substitute for fossil energy and as a raw material for power generation. In rural areas of my country, power supply is prone to fluctuations due to the influence of terrain, seasons and climate, resulting in unstable air-conditioning power consumption in hot summers, and people are reluctant to use air-conditioning due to the high energy consumption of air-conditioning. Using biomass to generate biogas for air-conditioning power supply can not only solve the problem of rural waste emissions, but also alleviate the pressure of city power supply, and allow users to have a cool summer. However, the biogas production of anaerobic fermentation tanks is closely related to the fermentation temperature. The most suitable temperature for medium-temperature fermentation with a higher gas production rate is about 35°C. However, most of the biogas tanks in rural my country are fermented at room temperature due to various conditions, and the gas production rate of biogas tanks is very low.

[0004] In order to increase the gas production rate of biogas tanks, the common technology is to use solar collectors and use circulating water pipes to heat the heaters installed in the biogas tanks to increase the fermentation temperature of the biogas slurry and improve the gas production rate. However, solar power generation is affected by sunlight and is difficult to use on cloudy days and at night. Even if a battery device can be used to store electricity and use the battery to power the electric heater on cloudy days or at night, it is still affected by sunlight and it is difficult to ensure continuous high gas production. Summary of the invention

[0005] Therefore, the present application provides an air-conditioned fermentation circulation system and an air-conditioning system, which can solve the problems of low temperature and low gas production rate of biogas tanks in the prior art.

[0006] In order to solve the above problems, the present application provides an air-conditioning fermentation circulation system, comprising:

[0007] An air conditioning device includes a refrigerant circulation circuit, wherein the refrigerant circulation circuit includes a condenser;

[0008] A fermentation system, comprising a fermenter and a power generation system, wherein the biogas produced by the fermenter is used by the power generation system;

[0009] The condenser exchanges heat with the liquid in the fermenter; and the electricity generated by the power generation system is provided to the air conditioning device.

[0010] In some embodiments,

[0011] The fermentation system also includes a circulating water system, which includes a hot water storage tank. The condenser is arranged in the hot water storage tank and exchanges heat with the water in the hot water storage tank. The liquid in the fermenter exchanges heat with the water in the hot water storage tank.

[0012] In some embodiments,

[0013] The circulating water system also includes a heat exchange coil, which is arranged in the fermenter and exchanges heat with the material in the fermenter; both ends of the heat exchange coil are respectively connected to the hot water storage.

[0014] In some embodiments,

[0015] The circulating water system also includes a water storage tank, which is connected to the outlet end of the heat exchange coil and the inlet end of the hot water storage tank.

[0016] In some embodiments,

[0017] The circulating water system also includes a power device to drive the flow of water in the circulating water system.

[0018] In some embodiments,

[0019] The power generation system comprises a power generation device and a purification device, and the biogas is sent to the power generation device after passing through the purification device.

[0020] According to another aspect of the present application, an air-conditioning system is provided, comprising the air-conditioning fermentation circulation system as described above.

[0021] In some embodiments,

[0022] The air-conditioning system also includes a first compressor, an indoor heat exchanger, a first throttling device, a second throttling device, a second compressor, and an outdoor heat exchanger. The first compressor and the second compressor are arranged in parallel, and their outlets are simultaneously connected to one end of the condenser and one end of the indoor heat exchanger; the other end of the condenser is simultaneously connected to the other end of the indoor heat exchanger and one end of the outdoor heat exchanger through the first throttling device, and the other end of the outdoor heat exchanger is connected to one end of the indoor heat exchanger and then connected to the inlet of the first compressor; the inlet of the second compressor is connected to the other end of the indoor heat exchanger through the second throttling device.

[0023] In some embodiments,

[0024] The air-conditioning system is in cooling mode, and the refrigerant circulation loop also includes a first compressor, an indoor heat exchanger and a first throttling device; the outlet of the first compressor is connected to the condenser, the first throttling device and the indoor heat exchanger in sequence, and then connected to the inlet of the first compressor.

[0025] In some embodiments,

[0026] The air-conditioning system is in heating mode, and the refrigerant circulation loop also includes a first compressor, an indoor heat exchanger, a second throttling device, a second compressor, a first throttling device, and an outdoor heat exchanger; the first compressor outlet is connected to the indoor heat exchanger, the second throttling device, the second compressor, the condenser, the first throttling device and the outdoor heat exchanger in sequence, and then connected to the first compressor inlet.

[0027] The present application provides an air-conditioning fermentation circulation system, comprising: an air-conditioning device, including a refrigerant circulation loop, wherein the refrigerant circulation loop includes a condenser; a fermentation system, including a fermenter and a power generation system, wherein the biogas produced by the fermenter is used by the power generation system; the condenser exchanges heat with the liquid in the fermenter; and the electricity generated by the power generation system is provided to the air-conditioning device.

[0028] This application has the following beneficial effects:

[0029] The fermentation liquid is heated by the condenser of the air-conditioning system, so that the gas production rate of the fermentation can be improved. The produced biogas is used for power generation and can be supplied to the air-conditioning device, which is equivalent to the effective utilization of the waste heat of the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the implementation methods or the prior art descriptions. The drawings described below are merely exemplary, and for those of ordinary skill in the art, other implementation drawings can be derived from the provided drawings without creative work.

[0031] Figure 1 This is a schematic diagram of the structure of the air conditioning system according to an embodiment of the present application.

[0032] The reference numerals are:

[0033] 1. Indoor unit; 101. Indoor fan; 102. Indoor heat exchanger;

[0034] 2. First throttling device; 3. External fan; 4. Outdoor heat exchanger; 5. First compressor; 6. Second compressor; 7. Condenser; 8. Hot water storage; 9. Fluid pump; 10. Fermentation tank; 11. Heat exchange coil; 12. Purification system; 13. Power generation device; 14. Transformer; 15. Water storage tank; 16. Fluid pump; 17. Second throttling device. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0037] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0038] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0039] See also Figure 1 As shown, according to an embodiment of the present application, an air-conditioning fermentation circulation system includes:

[0040] The air conditioning device comprises a refrigerant circulation circuit, wherein the refrigerant circulation circuit comprises a condenser 7;

[0041] A fermentation system, comprising a fermenter and a power generation system, wherein the biogas produced by the fermenter is used by the power generation system;

[0042] The condenser 7 exchanges heat with the liquid in the fermenter; the electricity generated by the power generation system is provided to the air conditioning device for use.

[0043] The present application heats the fermentation liquid through the condenser of the air-conditioning system, so that the gas production rate of the fermentation can be improved. The produced biogas is used for power generation and can be supplied to the air-conditioning device, which is equivalent to the effective utilization of the waste heat of the air-conditioning system.

[0044] The condenser in the traditional air-conditioning system needs to release a large amount of heat, while for the biogas tanks used in rural areas, the ambient temperature is generally lower than the fermentation temperature. This application uses the heat that needs to be dissipated by the air-conditioning system to heat the liquid in the fermentation system, so that the fermentation temperature can be increased or maintained at a suitable fermentation temperature, which is more conducive to fermentation and increases biogas production.

[0045] The generated biogas is sent to the power generation system and consumed as energy for power generation. The generated electricity is transmitted back to the air-conditioning device, which makes use of the heat that needs to be dissipated by the air-conditioning system, thereby reducing the power loss of the air-conditioning system and achieving energy conservation and emission reduction.

[0046] Biogas is used for power generation. Currently, it is known that the main method is to burn biogas to produce high-temperature and high-pressure combustion gas, which is used to push the piston movement through the cylinder of the gas engine, and then drives the generator to generate electricity; of course, there may be other ways to achieve power generation in the future.

[0047] Here, the condenser 7 refers to a heat exchanger that only dissipates heat to the outside, that is, the condenser 7 provides heat to the liquid in the fermenter so that the temperature reaches a suitable fermentation temperature.

[0048] In some embodiments,

[0049] The fermentation system also includes a circulating water system, which includes a hot water storage tank 8. The condenser 7 is arranged in the hot water storage tank 8 and exchanges heat with the water in the hot water storage tank 8; the liquid in the fermenter exchanges heat with the water in the hot water storage tank 8.

[0050] The heat emitted by the condenser 7 is mainly utilized in the fermentation system through a circulating water system; the heat of the condenser 7 is absorbed by the hot water storage device 8 in the circulating water system and stored in the water, taking advantage of the high specific gravity and good heat storage performance of water; then the liquid in the fermenter is heat exchanged with the water in the hot water storage device 8, which makes it easier to adjust the heat transfer and control the temperature in the fermenter, thereby improving the gas production efficiency.

[0051] In some embodiments,

[0052] The circulating water system further includes a heat exchange coil 11, which is disposed in the fermenter and exchanges heat with the material in the fermenter; both ends of the heat exchange coil 11 are respectively connected to the hot water storage 8.

[0053] The circulating water system also includes a heat exchange coil 11, which is arranged in the fermenter to increase the heat exchange area and heat exchange efficiency with the liquid in the fermenter.

[0054] In some embodiments,

[0055] The circulating water system also includes a water storage tank 15 , which is connected to the outlet end of the heat exchange coil 11 and the inlet end of the hot water storage tank 8 .

[0056] For the water in the circulating water system, since the hot water storage 8 is always in a heated state, volatilization will occur, resulting in a decrease in the amount of water. Therefore, a water storage tank 15 is provided to not only replenish the water volume, but also buffer the low-temperature water flowing out of the heat exchange coil 11 in the fermenter.

[0057] In some embodiments,

[0058] The circulating water system also includes a power device to drive the flow of water in the circulating water system.

[0059] For the circulation of water in the circulating water system, power equipment, including fluid pumps, can be added to determine its flow rate and direction, so that the fermentation temperature in the fermenter can be more accurately controlled.

[0060] like Figure 1 As shown, a fluid pump 9 may be provided between the hot water storage tank and the fermenter, and a fluid pump 16 may be provided between the water storage tank and the hot water storage tank.

[0061] In some embodiments,

[0062] The power generation system comprises a power generation device 13 and a purification device, and the biogas is sent to the power generation device 13 after passing through the purification device.

[0063] When using biogas for power generation, since the fermented biogas itself also contains other impurity gases, such as carbon dioxide, hydrogen sulfide, nitrogen and carbon monoxide, some of which cannot be directly burned and discharged, too many impurities will affect the combustion value and are not conducive to power generation. Therefore, it is necessary to purify the biogas before entering the power generation device 13.

[0064] According to another aspect of the present application, an air-conditioning system is provided, comprising the air-conditioning fermentation circulation system as described above.

[0065] In some embodiments,

[0066] The air-conditioning system also includes a first compressor 5, an indoor heat exchanger 102, a first throttling device 2, a second throttling device 17, a second compressor 6, and an outdoor heat exchanger 4. The first compressor 5 and the second compressor 6 are arranged in parallel, and their outlets are simultaneously connected to one end of the condenser 7 and one end of the indoor heat exchanger 102; the other end of the condenser 7 is simultaneously connected to the other end of the indoor heat exchanger 102 and one end of the outdoor heat exchanger 4 through the first throttling device 2, and the other end of the outdoor heat exchanger 4 is connected to one end of the indoor heat exchanger 102, and then connected to the inlet of the first compressor 5; the inlet of the second compressor 6 is connected to the other end of the indoor heat exchanger 102 through the second throttling device 17.

[0067] An internal fan 101 is arranged side by side at the indoor heat exchanger 102, and an external fan 3 is arranged at the outdoor heat exchanger 4, so as to enhance the heat dissipation effect of the two heat exchangers.

[0068] According to the structure of the above-mentioned air conditioning system, valves can be optionally provided on the connecting pipelines to realize different circulation modes. The specific implementation modes include the following two modes, but are not limited to these two circulation modes.

[0069] In some embodiments,

[0070] The air-conditioning system is in cooling mode, and the refrigerant circulation loop also includes a first compressor 5, an indoor heat exchanger 102 and a first throttling device 2; the outlet of the first compressor 5 is connected to the condenser 7, the first throttling device 2 and the indoor heat exchanger 102 in sequence, and then connected to the inlet of the first compressor 5.

[0071] When the air conditioner is cooling, the refrigerant is compressed by the first compressor 5 and becomes high-temperature and high-pressure steam. The high-temperature and high-pressure refrigerant flows through the condenser 7 in the hot water storage pipe and exchanges heat with the water in the hot water storage tank. At this time, the water temperature in the hot water storage tank rises, and the higher temperature hot water flows into the anaerobic fermentation system under the action of the fluid pump 9. It flows in the heat exchange coil 11 of the anaerobic fermentation system and transfers heat to the fermentation liquid. The temperature of the fermentation liquid is further increased, which is more conducive to fermentation, thereby increasing the biogas production. The biogas produced by anaerobic fermentation is purified and used to generate electricity to power the air conditioner.

[0072] The low-temperature and high-pressure refrigerant coming out of the condenser 7 passes through the first throttling device 2, such as the throttling effect of a capillary tube, and becomes low-temperature and low-pressure refrigeration vapor, which flows into the indoor unit 1 for evaporative cooling.

[0073] In some embodiments,

[0074] The air-conditioning system is in heating mode, and the refrigerant circulation loop also includes a first compressor 5, an indoor heat exchanger 102, a second throttling device 17, a second compressor 6, a first throttling device 2, and an outdoor heat exchanger 4; the outlet of the first compressor 5 is connected to the indoor heat exchanger 102, the second throttling device 17, the second compressor 6, the condenser 7, the first throttling device 2 and the outdoor heat exchanger 4 in sequence, and then connected to the inlet of the first compressor 5.

[0075] When the air conditioning system is in heating mode, the air conditioning system of the present application adopts two condensers, two compressors, and two throttling components. The refrigerant is compressed by the first compressor 5 and becomes a high-temperature and high-pressure steam. The high-temperature and high-pressure refrigerant flows through the indoor unit 1 and is heat-exchanged to become a medium-low-temperature and high-pressure vapor-liquid mixture. The refrigerant is slightly throttled by the second throttling device 17 and becomes a medium-low-temperature and medium-low-pressure vapor-liquid mixture. Under the throttling effect of the second throttling device 17, the refrigerant enters the second compressor 6 for compression and becomes a high-temperature and high-pressure refrigeration steam. The high-temperature and high-pressure refrigerant flows through the condenser 7 in the hot water storage pipe and exchanges heat with the water in the hot water storage tank. At this time, the water temperature in the hot water storage tank rises, and the higher-temperature hot water flows into the anaerobic fermentation system under the action of the fluid pump 9. It flows in the heat exchange coil 11 of the anaerobic fermentation system and transfers heat to the fermentation liquid. The temperature of the fermentation liquid is further increased, which is more conducive to fermentation, thereby increasing the biogas production. The biogas produced by anaerobic fermentation is purified and used to generate electricity to power the air conditioner.

[0076] The low-temperature and high-pressure refrigerant coming out of the condenser 7 is converted into low-temperature and low-pressure refrigeration vapor by the throttling effect of the first throttling device 2, and flows into the outdoor heat exchanger 4 outdoors, absorbs outdoor heat, and enters the first compressor 5 for compression. This cycle is repeated, and heating of the indoor room and the anaerobic fermentation tank 10 is achieved through two-stage compression.

[0077] The present application provides a biomass energy storage air conditioning system and control method, which mainly includes an air conditioning indoor unit 1, two condensers, two compressors, two throttling components and an anaerobic fermentation system, a power generation system and a power supply system. The air conditioning waste heat is fully recovered through the two-stage compressor and two condensers to achieve cooling of the outdoor unit during heating, and the recovered air conditioning waste heat is used in the anaerobic fermentation system to maintain the temperature of the fermentation system at 35°C. The appropriate fermentation temperature further increases the gas production of the anaerobic fermentation system. The biogas can be used for power generation after the purification system 12, which in turn supplies power to the air conditioning system, achieving energy conservation and emission reduction.

[0078] This application makes full use of the waste heat from air conditioning to provide heating capacity for the anaerobic fermentation system. When used in conjunction with the power grid, it can achieve "peak shaving and valley filling". When the power demand from the power grid is very low, the excess electricity generated by the power grid is converted into heat to heat the anaerobic fermentation system, and then energy is stored in the form of biogas produced by biomass. This can not only solve the problem of waste emissions in rural areas, but also ease the pressure on municipal power supply, and allow users to have cool summers and warm winters.

[0079] It is easy for those skilled in the art to understand that the above-mentioned implementation modes can be freely combined and superimposed without conflict.

[0080] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. An air-conditioning fermentation circulation system, characterized in that: include: An air conditioning device comprises a refrigerant circulation circuit, wherein the refrigerant circulation circuit comprises a condenser (7); A fermentation system, comprising a fermenter and a power generation system, wherein the biogas produced by the fermenter is used by the power generation system; The condenser (7) exchanges heat with the liquid in the fermenter; the electricity generated by the power generation system is provided to the air conditioning device for use.

2. The air-conditioning fermentation circulation system according to claim 1, characterized in that: The fermentation system also includes a circulating water system, which includes a hot water storage tank (8). The condenser (7) is arranged in the hot water storage tank (8) and exchanges heat with the water in the hot water storage tank (8); the liquid in the fermenter exchanges heat with the water in the hot water storage tank (8).

3. The air-conditioning fermentation circulation system according to claim 2, characterized in that: The circulating water system further comprises a heat exchange coil (11), which is arranged in the fermenter and exchanges heat with the material in the fermenter; both ends of the heat exchange coil (11) are respectively connected to the hot water storage tank (8).

4. The air-conditioning fermentation circulation system according to claim 3, characterized in that: The circulating water system also includes a water storage tank (15), and the water storage tank (15) is connected to the outlet end of the heat exchange coil (11) and the inlet end of the hot water storage tank (8).

5. The air-conditioning fermentation circulation system according to any one of claims 1 to 4, characterized in that: The circulating water system also includes a power device to drive the flow of water in the circulating water system.

6. The air-conditioning fermentation circulation system according to claim 1, characterized in that: The power generation system comprises a power generation device (13) and a purification device, and the biogas is sent to the power generation device (13) after passing through the purification device.

7. An air conditioning system, characterized in that: It comprises the air-conditioning fermentation circulation system as described in any one of claims 1 to 6.

8. The air conditioning system according to claim 7, characterized in that: The air conditioning system also includes a first compressor (5), an indoor heat exchanger (102), a first throttling device (2), a second throttling device (17), a second compressor (6), and an outdoor heat exchanger (4). The first compressor (5) and the second compressor (6) are arranged in parallel, and their outlets are simultaneously connected to one end of the condenser (7) and one end of the indoor heat exchanger (102); the other end of the condenser (7) is simultaneously connected to the other end of the indoor heat exchanger (102) and one end of the outdoor heat exchanger (4) through the first throttling device (2); the other end of the outdoor heat exchanger (4) is connected to one end of the indoor heat exchanger (102), and then connected to the inlet of the first compressor (5); the inlet of the second compressor (6) is connected to the other end of the indoor heat exchanger (102) through the second throttling device (17).

9. The air conditioning system according to claim 8, characterized in that: The air-conditioning system is in cooling mode, and the refrigerant circulation circuit also includes a first compressor (5), an indoor heat exchanger (102) and a first throttling device (2); the outlet of the first compressor (5) is connected to the condenser (7), the first throttling device (2) and the indoor heat exchanger (102) in sequence, and then connected to the inlet of the first compressor (5).

10. The air conditioning system according to claim 8, characterized in that: The air-conditioning system is in heating mode, and the refrigerant circulation loop also includes a first compressor (5), an indoor heat exchanger (102), a second throttling device (17), a second compressor (6), a first throttling device (2), and an outdoor heat exchanger (4); the outlet of the first compressor (5) is connected to the indoor heat exchanger (102), the second throttling device (17), the second compressor (6), the condenser (7), the first throttling device (2) and the outdoor heat exchanger (4) in sequence, and then connected to the inlet of the first compressor (5).

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