Low-carbon drying and refrigerating all-in-one machine

Abstract

The invention relates to the technical field of drying and refrigerating, in particular to a low-carbon drying and refrigerating all-in-one machine which comprises an air source heat pump module, an energy storage module connected with the air source heat pump module and a working cavity connected with the energy storage module. The air source heat pump module comprises a fluid separator, a compressor connected with an outlet of the fluid separator, a four-way reversing valve connected with an outlet of the compressor, a first heat exchanger and a second heat exchanger, wherein the first heat exchanger and the second heat exchanger are connected with the four-way reversing valve. Wherein the compressor, the fluid separator, the first heat exchanger and the second heat exchanger are respectively connected with different ports of the four-way reversing valve; the energy storage module comprises an energy storage tank with an inlet connected with the first heat exchanger, a pump connected with an outlet of the energy storage tank, and a third heat exchanger connected with the pump. The third heat exchanger is also connected with the first heat exchanger; and the working chamber is connected with the third heat exchanger through a recovery pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of drying and refrigeration, and in particular to a low-carbon drying and refrigeration integrated machine. Background Art

[0002] Traditional drying technologies generally have disadvantages such as high energy consumption, complex operation, and long drying cycle. At the same time, these drying methods often make it difficult to ensure the quality and nutritional value of the product, and the energy utilization rate during the drying process is low. In addition, for the processing of food and agricultural products, drying and refrigeration are conventional technical requirements. The mature technical means generally used in the prior art are ammonia systems and pure fluorine systems. However, in terms of applicability, energy saving and environmental protection, traditional refrigeration technologies such as ammonia systems and pure fluorine systems still have shortcomings. For example, the ammonia system must be used reasonably while meeting safety requirements, while the pure fluorine system has poor environmental protection due to the large amount of high ODP and high GWP refrigerants used.

[0003] Carbon dioxide is an environmentally friendly refrigerant that exists naturally in nature. It has stable chemical and thermodynamic properties. It will not decompose harmful gases even at high temperatures. In the event of leakage, it will not harm the human body, food, or ecology. When carbon dioxide is used as a refrigerant, the liquid viscosity is low, the flow resistance is small, and the heat transfer performance is better than that of Freon refrigerants. Using carbon dioxide as a refrigerant is a direct consumption of carbon dioxide. In a sense, the large-scale use of carbon dioxide as a refrigerant is the optimal path for the development of refrigeration and drying technology under the dual carbon goals.

[0004] In this regard, publication number CN110822761A discloses a refrigeration and heating system based on a four-way reversing valve, which uses a four-way reversing valve to achieve the reversal of refrigeration and heating in the carbon dioxide system, so that only one compressor is needed to achieve both refrigeration and heating functions. For this disclosed technology, the overall system needs to use multiple four-way reversing valves, so the pipeline structure is complicated.

[0005] Therefore, based on the perspective of simplifying the carbon dioxide refrigeration and drying integrated equipment, the research also needs to further optimize and improve its overall piping structure design. Summary of the invention

[0006] The purpose of the present invention is to provide a low-carbon drying and refrigeration integrated machine to solve the technical problem of optimizing its pipeline structure.

[0007] The low-carbon drying and refrigeration integrated machine of the present invention is realized as follows: A low-carbon drying and refrigeration integrated machine, comprising: an air source heat pump module, an energy storage module connected to the air source heat pump module, and a working chamber connected to the energy storage module; wherein The air source heat pump module comprises a fluid separator, a compressor connected to the outlet of the fluid separator, a four-way reversing valve connected to the outlet of the compressor, and a first heat exchanger and a second heat exchanger respectively connected to the four-way reversing valve; wherein the compressor, the fluid separator, the first heat exchanger and the second heat exchanger are respectively connected to different ports of the four-way reversing valve; The energy storage module comprises an energy storage tank whose inlet is connected to the first heat exchanger, a pump connected to the outlet of the energy storage tank, and a third heat exchanger connected to the pump; wherein the third heat exchanger is also connected to the first heat exchanger; The working chamber is connected to the third heat exchanger through a recovery pipeline.

[0008] In an optional implementation of the present invention, the outlet of the first heat exchanger is connected to the inlet of the first pressure reducing valve and the left end of the first rotary valve respectively.

[0009] In an optional implementation of the present invention, the outlet of the first pressure reducing valve and the right end of the first rotary valve converge and are then connected to the inlet of the second pressure reducing valve and the right end of the second rotary valve respectively; and The outlet of the second pressure reducing valve and the left end of the second rotary valve are connected to the second heat exchanger after being converged.

[0010] In an optional implementation of the present invention, the energy storage module further includes an energy storage medium suitable for flowing between the first heat exchanger energy storage tank and the third heat exchanger.

[0011] In an optional implementation of the present invention, in the heating mode, the four-way reversing valve connects the outlet of the compressor to the first heat exchanger, and connects the second heat exchanger to the fluid separator; the low-temperature and low-pressure carbon dioxide gas passes through the compressor to become high-temperature and high-pressure supercritical carbon dioxide or carbon dioxide superheated gas, enters the first heat exchanger through the four-way reversing valve and is converted into low-temperature and high-pressure carbon dioxide liquid, opens the first rotary valve, and is converted into low-temperature and low-pressure carbon dioxide gas-liquid two-phase through the second pressure reducing valve, and then is converted into low-temperature and low-pressure carbon dioxide gas through the second heat exchanger, and finally flows through the fluid separator through the four-way reversing valve back to the compressor.

[0012] In an optional implementation of the present invention, in the heating mode, the energy storage medium absorbs heat through the first heat exchanger and enters the energy storage tank for storage. When the heat reaches a valley value, the energy storage medium stores the heat in the energy storage tank. When the energy reaches a peak value, the heat is released into the working chamber through the third heat exchanger through the pump.

[0013] In an optional implementation of the present invention, in the refrigeration mode, the four-way reversing valve connects the outlet of the compressor to the second heat exchanger, and connects the first heat exchanger to the fluid separator; the low-temperature and low-pressure carbon dioxide gas passes through the compressor to become high-temperature and high-pressure supercritical carbon dioxide or carbon dioxide superheated gas, enters the second heat exchanger through the four-way reversing valve and is converted into high-temperature and high-pressure carbon dioxide liquid, opens the second rotary valve, and is converted into low-temperature and low-pressure carbon dioxide gas-liquid two-phase through the first pressure reducing valve, and then is converted into low-temperature and low-pressure carbon dioxide gas through the first heat exchanger, and finally flows through the fluid separator through the four-way reversing valve back to the compressor.

[0014] In an optional implementation of the present invention, in the refrigeration mode, the energy storage medium absorbs cold energy through the first heat exchanger and enters the energy storage tank for storage. When the heat reaches the valley value, the energy storage medium stores the cold energy in the energy storage tank. When the energy reaches the peak value, the cold energy is released into the working chamber through the third heat exchanger through the pump.

[0015] In an optional implementation of the present invention, the third heat exchanger is connected to the first heat exchanger via a stop valve.

[0016] In an optional implementation of the present invention, an induced draft fan is provided in the recovery pipeline.

[0017] By adopting the above technical solution, the present invention has the following beneficial effects: the low-carbon drying and refrigeration integrated machine of the present invention changes the circulation path of the carbon dioxide working medium in the carbon dioxide air source heat pump system through a four-way reversing valve, so that the first heat exchanger can be used as an air cooler for heating in the drying stage of heating, and the first heat exchanger can be used as an evaporator for cooling in the refrigeration stage of cooling, so as to meet the needs of different materials for cold and heat sources, realize the cross-season operation of the system, achieve efficient energy utilization, reduce energy consumption and carbon emissions, and improve the quality and efficiency of product drying and refrigeration. Furthermore, through the optimized design of the pipeline, the entire low-carbon drying and refrigeration integrated machine only needs to use one compressor and one four-way reversing valve to meet the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure shows a schematic diagram of the structure of the low-carbon drying and refrigerating integrated machine of the present invention in a heating state; Figure 2 The figure shows a schematic structural diagram of the low-carbon drying and refrigeration integrated machine of the present invention when used in a refrigeration state.

[0019] In the figure: air source heat pump module 1, fluid separator 12, compressor 11, four-way reversing valve 13, first heat exchanger 15, first rotary valve 18, first pressure reducing valve 19, second rotary valve 16, second pressure reducing valve 17, second heat exchanger 14, energy storage tank 23, pump 22, third heat exchanger 21, stop valve 24, drying chamber 31, refrigerating chamber 32, energy storage module, working chamber 3. DETAILED DESCRIPTION

[0020] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0021] See also Figure 1 and Figure 2 As shown, this embodiment provides a low-carbon drying and refrigeration integrated machine, including: an air source heat pump 22 module 1, an energy storage module 2 connected to the air source heat pump 22 module 1, and a working chamber 3 connected to the energy storage module 2. The working chamber 3 here can be used as a refrigeration chamber 32 or a drying chamber 31 in combination with the actual working conditions, so that the low-carbon drying and refrigeration integrated machine of this embodiment can meet the needs of cold and heat sources of different materials and realize the cross-season operation of the system.

[0022] Next, let's be specific. First, the air source heat pump 22 module 1 includes a fluid separator 12, a compressor 11 connected to the outlet of the fluid separator 12, a four-way reversing valve 13 connected to the outlet of the compressor 11, and a first heat exchanger 15 and a second heat exchanger 14 respectively connected to the four-way reversing valve 13; wherein the compressor 11, the fluid separator 12, the first heat exchanger and the second heat exchanger are respectively connected to different ports of the four-way reversing valve 13. The first heat exchanger 15 here acts as an air cooler for heating in the drying stage of heating, and acts as an evaporator for cooling in the refrigeration stage of cooling. The air source heat pump 22 module 1 of this embodiment is a carbon dioxide cooling and heating module using carbon dioxide as the medium.

[0023] It should be noted that this embodiment does not make absolute limitations on the structure and implementation principle of the four-way reversing valve 13 of this embodiment, and any mature means in the prior art can be adopted. That is, as long as the circulation path of the carbon dioxide working medium in the carbon dioxide air source heat pump 22 system can be changed by the four-way reversing valve 13, the use requirements of this embodiment can be met.

[0024] Secondly, the energy storage module 2 includes an energy storage tank 23 whose inlet is connected to the first heat exchanger 15, a pump 22 connected to the outlet of the energy storage tank 23, and a third heat exchanger 21 connected to the pump 22; wherein the third heat exchanger 21 is also connected to the first heat exchanger 15; the working chamber 3 here is connected to the third heat exchanger 21 through a recovery pipeline. The third heat exchanger 21 is connected to the first heat exchanger 15 through a stop valve 24. An induced draft fan is provided in the recovery pipeline.

[0025] Based on the above situation, further speaking, the outlet of the first heat exchanger 15 is connected to the inlet of the first pressure reducing valve 19 and the left end of the first rotary valve 18 respectively. The first pressure reducing valve 19 and the first rotary valve 18 are in a parallel structure. Based on this, the outlet of the first pressure reducing valve 19 and the right end of the first rotary valve 18 converge and are then connected to the inlet of the second pressure reducing valve 17 and the right end of the second rotary valve 16 respectively; and the outlet of the second pressure reducing valve 17 converges and is connected to the second heat exchanger 14 at the left end of the second rotary valve 16. The second pressure reducing valve 17 and the second rotary valve 16 are in a parallel structure.

[0026] It should also be noted that the energy storage module 2 also includes an energy storage medium suitable for circulation between the first heat exchanger energy storage tank 23 and the third heat exchanger 21. The energy storage medium here can be selected to be, for example, but not limited to, ethylene glycol. Using ethylene glycol solution as the energy storage medium can meet the normal operation of the equipment under more environmental conditions. It has been found through actual use that the energy generated by the air source heat pump 22 module 1 is stored by using the energy storage module 2, and the ethylene glycol solution is used as the energy storage medium to accurately control the release and storage of energy during peak and trough periods, thereby reducing the system energy consumption by about 20% and reducing the system carbon emissions by about 15%.

[0027] On the basis of the above structure, it is necessary to explain that, in the heating mode, the four-way reversing valve connects the outlet of the compressor 11 to the first heat exchanger 15, and connects the second heat exchanger 14 to the fluid separator 12; the low-temperature and low-pressure carbon dioxide gas passes through the compressor 11 to become high-temperature and high-pressure supercritical carbon dioxide or carbon dioxide superheated gas, enters the first heat exchanger 15 through the four-way reversing valve 13 to be converted into low-temperature and high-pressure carbon dioxide liquid, opens the first rotary valve 18 (the second rotary valve 16 is closed at this time), and is converted into low-temperature and low-pressure carbon dioxide gas-liquid two-phase through the second pressure reducing valve 17, and then converted into low-temperature and low-pressure carbon dioxide gas through the second heat exchanger 14, and finally flows through the fluid separator 12 through the four-way reversing valve 13 back to the compressor 11. Based on this, in the heating mode, the energy storage medium absorbs heat through the first heat exchanger 15 and enters the energy storage tank 23 for storage. When the heat reaches the valley value, the energy storage medium stores the heat in the energy storage tank 23. When the energy reaches the peak value, the heat is released into the working chamber 3 through the third heat exchanger 21 through the pump 22.

[0028] In addition, in the cooling mode, the four-way reversing valve connects the outlet of the compressor 11 with the second heat exchanger 14, and connects the first heat exchanger 15 with the fluid separator 12; the low-temperature and low-pressure carbon dioxide gas passes through the compressor 11 and becomes high-temperature and high-pressure supercritical carbon dioxide or carbon dioxide superheated gas, enters the second heat exchanger 14 through the four-way reversing valve 13 and is converted into high-temperature and high-pressure carbon dioxide liquid, opens the second rotary valve 16 (the first rotary valve 18 is closed at this time), and is converted into low-temperature and low-pressure carbon dioxide gas-liquid two-phase through the first pressure reducing valve 19, and then converted into low-temperature and low-pressure carbon dioxide gas through the first heat exchanger 15, and finally flows through the fluid separator 12 through the four-way reversing valve 13 and returns to the compressor 11. Based on this, in the cooling mode, the energy storage medium absorbs cold energy through the first heat exchanger 15 and enters the energy storage tank 23 for storage. When the heat reaches the valley value, the energy storage medium stores the cold energy in the energy storage tank 23. When the energy reaches the peak value, the pump 22 flows through the third heat exchanger 21 to release the cold energy into the working chamber 3.

[0029] In summary, for the low-carbon drying and refrigeration integrated machine of this embodiment, the circulation path of the carbon dioxide working medium in the carbon dioxide air source heat pump 22 system is changed by the four-way reversing valve 13, so that the first heat exchanger 15 can be freely switched as an air cooler for heating in the drying stage and as an evaporator for cooling in the refrigeration stage, thereby meeting the needs of cold and heat sources for different materials, realizing cross-season operation of the system, achieving efficient energy utilization, reducing energy consumption and carbon emissions, and improving the quality and efficiency of product drying and refrigeration.

[0030] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0031] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A low-carbon drying and refrigeration integrated machine, characterized in that: include: An air source heat pump module, an energy storage module connected to the air source heat pump module, and a working chamber connected to the energy storage module; in The air source heat pump module comprises a fluid separator, a compressor connected to the outlet of the fluid separator, a four-way reversing valve connected to the outlet of the compressor, and a first heat exchanger and a second heat exchanger respectively connected to the four-way reversing valve; wherein the compressor, the fluid separator, the first heat exchanger and the second heat exchanger are respectively connected to different ports of the four-way reversing valve; The energy storage module comprises an energy storage tank whose inlet is connected to the first heat exchanger, a pump connected to the outlet of the energy storage tank, and a third heat exchanger connected to the pump; wherein the third heat exchanger is also connected to the first heat exchanger; The working chamber is connected to the third heat exchanger through a recovery pipeline.

2. The low-carbon drying and refrigeration integrated machine according to claim 1, characterized in that: The outlet of the first heat exchanger is connected to the inlet of the first pressure reducing valve and the left end of the first rotary valve respectively.

3. The low-carbon drying and refrigeration integrated machine according to claim 2, characterized in that: The outlet of the first pressure reducing valve and the right end of the first rotary valve are connected to the inlet of the second pressure reducing valve and the right end of the second rotary valve respectively after being converged; and The outlet of the second pressure reducing valve and the left end of the second rotary valve are connected to the second heat exchanger after being converged.

4. The low-carbon drying and refrigeration integrated machine according to claim 3, characterized in that: The energy storage module further includes an energy storage medium adapted to flow between the first heat exchanger energy storage tank and the third heat exchanger.

5. The low-carbon drying and refrigeration integrated machine according to claim 4, characterized in that: In the heating mode, the four-way reversing valve connects the outlet of the compressor to the first heat exchanger, and connects the second heat exchanger to the fluid separator; the low-temperature and low-pressure carbon dioxide gas passes through the compressor to become high-temperature and high-pressure supercritical carbon dioxide or carbon dioxide superheated gas, enters the first heat exchanger through the four-way reversing valve and is converted into low-temperature and high-pressure carbon dioxide liquid, opens the first rotary valve, and is converted into low-temperature and low-pressure carbon dioxide gas-liquid two-phase through the second pressure reducing valve, and then is converted into low-temperature and low-pressure carbon dioxide gas through the second heat exchanger, and finally flows through the fluid separator through the four-way reversing valve back to the compressor.

6. The low-carbon drying and refrigeration integrated machine according to claim 5, characterized in that: In the heating mode, the energy storage medium absorbs heat through the first heat exchanger and enters the energy storage tank for storage. When the heat reaches the valley value, the energy storage medium stores the heat in the energy storage tank. When the energy reaches the peak value, the heat is released into the working chamber through the third heat exchanger through the pump.

7. The low-carbon drying and refrigerating integrated machine according to any one of claims 4 to 6, characterized in that: In the refrigeration mode, the four-way reversing valve connects the outlet of the compressor to the second heat exchanger, and connects the first heat exchanger to the fluid separator; the low-temperature and low-pressure carbon dioxide gas passes through the compressor to become high-temperature and high-pressure supercritical carbon dioxide or carbon dioxide superheated gas, enters the second heat exchanger through the four-way reversing valve and is converted into high-temperature and high-pressure carbon dioxide liquid, opens the second rotary valve, and is converted into low-temperature and low-pressure carbon dioxide gas-liquid two-phase through the first pressure reducing valve, and then is converted into low-temperature and low-pressure carbon dioxide gas through the first heat exchanger, and finally flows through the fluid separator through the four-way reversing valve back to the compressor.

8. The low-carbon drying and refrigeration integrated machine according to claim 7, characterized in that: In the refrigeration mode, the energy storage medium absorbs cold energy through the first heat exchanger and enters the energy storage tank for storage. When the heat reaches the valley value, the energy storage medium stores the cold energy in the energy storage tank. When the energy reaches the peak value, the cold energy is released into the working chamber through the third heat exchanger through the pump.

9. The low-carbon drying and refrigeration integrated machine according to any one of claims 1 to 4, characterized in that: The third heat exchanger is connected to the first heat exchanger via a stop valve.

10. The low-carbon drying and refrigeration integrated machine according to claim 1, characterized in that: An induced draft fan is arranged in the recovery pipeline.

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