Carbon dioxide compression system heat pump unit for tobacco leaf baking

Abstract

The utility model discloses a carbon dioxide compression system heat pump unit for tobacco leaf baking, which relates to the technical field of baking equipment, and comprises a plurality of carbon dioxide compression heating loops, and each carbon dioxide compression heating loop comprises a carbon dioxide compressor, an air cooler, an expansion valve, an evaporator and a gas-liquid separator which are sequentially connected, a gas outlet of the gas-liquid separator is communicated with a gas inlet of the carbon dioxide compressor; all the air coolers are arranged in a heating chamber of the tobacco leaf curing barn at intervals from top to bottom; the carbon dioxide compressor, the expansion valve, the evaporator and the gas-liquid separator are all arranged outside the tobacco curing barn. According to the utility model, by utilizing the characteristics of the carbon dioxide refrigerant, the energy consumption can be obviously reduced in the tobacco leaf curing process, and particularly, stronger adaptability is shown in high-altitude areas and low-temperature environments.

Description

Technical Field

[0001] The utility model relates to the technical field of baking equipment, in particular to a heat pump unit of a carbon dioxide compression system for baking tobacco leaves. Background Art

[0002] In the current domestic tobacco drying field, R134a single compressor heat pump units are commonly used to complete tobacco leaf baking related operations.

[0003] When using traditional R134a heat pump units for tobacco curing, energy consumption per kang is relatively high. Especially at high altitudes or during periods of low ambient temperatures, frequent activation of electric auxiliary heating is required to maintain a constant temperature in the curing room. This further increases the energy consumption of the heat pump equipment, directly leading to increased curing costs. Single-compression heat pumps using R134a refrigerant are available on the market, but their energy consumption is relatively high. Furthermore, during periods when tobacco curing requires temperatures of 50°C or above, the basic electric heating function must operate at full power to compensate for the lack of heat. This not only increases energy consumption but also demonstrates its inability to provide sufficient heat.

[0004] If a single compressor fails, tobacco curing cannot continue, posing a significant risk to tobacco safety. This can also indirectly lead to economic losses related to tobacco curing, such as reduced tobacco quality. Furthermore, R134a compressor system performance is limited in extremely low temperatures, significantly impacting global warming. Utility Model Content

[0005] The purpose of the utility model is to provide a heat pump unit of a carbon dioxide compression system for tobacco leaf baking, so as to solve the problems existing in the above-mentioned prior art, achieve better tobacco leaf baking effect, and take into account the dual benefits of environmental protection and economy.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] The utility model provides a heat pump unit of a carbon dioxide compression system for tobacco leaf baking, comprising a plurality of carbon dioxide compression heating circuits, each of which comprises a carbon dioxide compressor, an air cooler, an expansion valve, an evaporator and a gas-liquid separator connected in sequence, and the gas outlet of the gas-liquid separator is connected to the gas inlet of the carbon dioxide compressor;

[0008] All the air coolers are arranged in a heating chamber of a tobacco leaf curing room from top to bottom; the carbon dioxide compressor, the expansion valve, the evaporator and the gas-liquid separator are all arranged outside the tobacco leaf curing room.

[0009] Preferably, there are two carbon dioxide compression heating circuits.

[0010] Preferably, the carbon dioxide compression heating circuit also includes a regenerator, the air outlet of the air cooler is connected to the heat medium inlet of the regenerator, and the heat medium outlet of the regenerator is connected to the air inlet of the expansion valve; the discharge port of the evaporator is connected to the refrigerant inlet of the regenerator, and the refrigerant outlet of the regenerator is connected to the feed port of the gas-liquid separator.

[0011] Preferably, the carbon dioxide compression heating circuit further includes a heat dissipation fan for dissipating heat from the evaporator.

[0012] Preferably, the air outlet of the heating chamber is arranged at the top of the heating chamber, and a circulating fan is provided at the air outlet of the heating chamber.

[0013] Preferably, it also includes an electric auxiliary heater arranged in the heating chamber.

[0014] Preferably, the electric auxiliary heater is located above all the air coolers.

[0015] Preferably, carbon dioxide flows in each of the carbon dioxide compression heating circuits.

[0016] Preferably, the air inlet of the heating chamber is arranged at the bottom of the heating chamber, and a fresh air inlet communicating with the air inlet of the heating chamber is also provided in the heating chamber, and all the air coolers are located directly above the fresh air inlet.

[0017] Preferably, the bottom of the heating chamber is further provided with a moisture drain port communicating with the air inlet.

[0018] Compared with the prior art, the utility model has achieved the following technical effects:

[0019] The heat pump unit of the carbon dioxide compression system for tobacco leaf baking of the utility model utilizes the refrigerant characteristics of carbon dioxide, which can significantly reduce energy consumption during the tobacco leaf baking process, and shows stronger adaptability, especially in high-altitude areas and low-temperature environments.

[0020] Furthermore, during use of the present invention, when one carbon dioxide compressor fails, the other carbon dioxide compressor can continue to operate independently, thereby ensuring the continuous operation and reliability of the system and providing a solid safety guarantee for the tobacco baking process.

[0021] Furthermore, in the field of tobacco leaf baking, the carbon dioxide compression system heat pump unit for tobacco leaf baking of the present invention not only has significant economic benefits, but also embodies environmental protection advantages; its high efficiency and energy saving, safety and stability, and easy maintenance characteristics are expected to bring epoch-making scientific and technological progress to the tobacco leaf baking industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic structural diagram of a heat pump unit of a carbon dioxide compression system for tobacco leaf baking according to the present invention;

[0024] In the figure: 1000, heat pump unit of carbon dioxide compression system for tobacco leaf curing;

[0025] 101. First CO2 compressor; 102. First air cooler; 103. First regenerator; 104. First expansion valve; 105. First evaporator; 106. First cooling fan; 107. First gas-liquid separator;

[0026] 201, second carbon dioxide compressor; 202, second air cooler; 203, second regenerator; 204, second expansion valve; 205, second evaporator; 206, second cooling fan; 207, second gas-liquid separator;

[0027] 30. Tobacco leaf curing room; 31. Heating chamber; 32. Circulating fan; 33. Electric auxiliary heater; 34. Fresh air inlet; 35. Dehumidification outlet. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] The purpose of the utility model is to provide a heat pump unit of a carbon dioxide compression system for tobacco leaf baking, so as to solve the problems existing in the above-mentioned prior art, achieve better tobacco leaf baking effect, and take into account the dual benefits of environmental protection and economy.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0031] like Figure 1As shown, this embodiment provides a carbon dioxide compression system heat pump unit 1000 for tobacco leaf curing, including several carbon dioxide compression heating circuits, each of which includes a carbon dioxide compressor, an air cooler, an expansion valve, an evaporator, and a gas-liquid separator connected in sequence, and the gas outlet of the gas-liquid separator is connected to the gas inlet of the carbon dioxide compressor;

[0032] All air coolers are arranged in a heating chamber 31 of the tobacco curing room 30 from top to bottom; the carbon dioxide compressor, expansion valve, evaporator and gas-liquid separator are all arranged outside the tobacco curing room 30; carbon dioxide flows in each carbon dioxide compression heating circuit.

[0033] The carbon dioxide compression system heat pump unit 1000 for tobacco leaf baking of this embodiment utilizes the refrigerant properties of carbon dioxide to significantly reduce energy consumption during tobacco leaf baking, and exhibits stronger adaptability, especially in high-altitude areas and low-temperature environments.

[0034] In the optional scheme of this embodiment, it is more preferred that there are two carbon dioxide compression heating circuits, namely a first carbon dioxide compression heating circuit and a second carbon dioxide compression heating circuit; the first carbon dioxide compression heating circuit includes a first carbon dioxide compressor 101, a first air cooler 102, a first expansion valve 104, a first evaporator 105 and a first gas-liquid separator 107; the second carbon dioxide compression heating circuit includes a second carbon dioxide compressor 201, a second air cooler 202, a second expansion valve 204, a second evaporator 205 and a second gas-liquid separator 207. During use of the carbon dioxide compression system heat pump unit 1000 for tobacco leaf curing of this embodiment, when one carbon dioxide compressor fails, the other carbon dioxide compressor can continue to operate independently, thereby ensuring the continuous operation and reliability of the system and providing a solid safety guarantee for the tobacco leaf curing process.

[0035] In the optional scheme of this embodiment, it is more preferred that the first carbon dioxide compression heating circuit also includes a first reheater 103, the air outlet of the first air cooler 102 is connected to the heat medium inlet of the first reheater 103, and the heat medium outlet of the first reheater 103 is connected to the air inlet of the first expansion valve 104; the discharge port of the first evaporator 105 is connected to the refrigerant inlet of the first reheater 103, and the refrigerant outlet of the first reheater 103 is connected to the feed port of the first gas-liquid separator 107; the second carbon dioxide compression heating circuit also includes a second reheater 203, the air outlet of the second air cooler 202 is connected to the heat medium inlet of the second reheater 203, and the heat medium outlet of the second reheater 203 is connected to the air inlet of the second expansion valve 204; the discharge port of the second evaporator 205 is connected to the refrigerant inlet of the second reheater 203, and the refrigerant outlet of the second reheater 203 is connected to the feed port of the second gas-liquid separator 207.

[0036] In an optional solution of this embodiment, preferably, the first carbon dioxide compression heating circuit further includes a first cooling fan 106 for dissipating heat from the first evaporator 105 ; the second carbon dioxide compression heating circuit further includes a second cooling fan 206 for dissipating heat from the second evaporator 205 .

[0037] Among the optional solutions of this embodiment, it is preferred that this embodiment also includes an electric auxiliary heater 33 disposed within the heating chamber 31, positioned above all air coolers. During the tobacco curing process, there are situations where relying solely on the CO2 compression system heat pump unit may not provide sufficient heat to maintain the required temperature conditions within the flue-curing barn. For example, at high altitudes or during periods of low ambient temperature, traditional heat pump equipment (such as an R134a single-compressor heat pump unit) requires frequent activation of electric auxiliary heating. While the CO2 compression system heat pump unit in this application has its advantages, it may also experience a slight heat shortage under extreme operating conditions. In these situations, the electric auxiliary heater 33 can serve as a supplementary heat source, providing timely additional heat to ensure a constant, suitable curing temperature within the flue-curing barn and guarantee the normal operation of the tobacco curing operation. Hot air has the characteristic of flowing upward. When the electric auxiliary heater 33 is positioned above all air coolers, the heat generated by the electric auxiliary heater 33 causes the surrounding air to rise. The air cooler is a link in the CO2 compression heating circuit, its primary function being to exchange heat and cool the gas. During operation, the air cooler located below cools the air flowing over its surface, forming a relatively low-temperature air layer. At this point, the hot air generated by the electric auxiliary heater 33 above rises and forms natural convection with the cooled air from the air cooler below. This promotes better mixing and circulation of the air in the flue-curing room, allowing the heat to be more evenly distributed within the room. This helps ensure that the tobacco leaves receive relatively uniform heat at all locations within the flue-curing room, thereby improving the quality and consistency of the tobacco leaves during curing.

[0038] In this embodiment, the specific structure of the heating chamber 31 of the tobacco curing barn 30 is as follows:

[0039] The air outlet of the heating chamber 31 is arranged at the top of the heating chamber 31, and a circulating fan 32 is provided at the air outlet of the heating chamber 31; the air inlet of the heating chamber 31 is arranged at the bottom of the heating chamber 31, and a fresh air inlet 34 communicating with the air inlet of the heating chamber 31 is also provided in the heating chamber 31, and all air coolers are located directly above the fresh air inlet 34; the bottom of the heating chamber 31 is also provided with a dehumidification port 35 communicating with the air inlet.

[0040] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A heat pump unit for a carbon dioxide compression system for tobacco leaf curing, characterized by: It includes several carbon dioxide compression heating circuits, each of which includes a carbon dioxide compressor, an air cooler, an expansion valve, an evaporator and a gas-liquid separator connected in sequence, and the gas outlet of the gas-liquid separator is connected to the gas inlet of the carbon dioxide compressor; All the air coolers are arranged in a heating chamber of a tobacco leaf curing room from top to bottom; the carbon dioxide compressor, the expansion valve, the evaporator and the gas-liquid separator are all arranged outside the tobacco leaf curing room.

2. The heat pump unit of the carbon dioxide compression system for tobacco leaf curing according to claim 1, characterized in that: There are two carbon dioxide compression heating circuits.

3. The heat pump unit of the carbon dioxide compression system for tobacco leaf curing according to claim 1, characterized in that: The carbon dioxide compression heating circuit also includes a regenerator, the air outlet of the air cooler is connected to the heat medium inlet of the regenerator, and the heat medium outlet of the regenerator is connected to the air inlet of the expansion valve; the discharge port of the evaporator is connected to the refrigerant inlet of the regenerator, and the refrigerant outlet of the regenerator is connected to the feed port of the gas-liquid separator.

4. The heat pump unit of the carbon dioxide compression system for tobacco leaf curing according to claim 1, characterized in that: The carbon dioxide compression heating circuit further includes a heat dissipation fan for dissipating heat from the evaporator.

5. The heat pump unit of the carbon dioxide compression system for tobacco leaf curing according to claim 1, characterized in that: The air outlet of the heating chamber is arranged at the top of the heating chamber, and a circulating fan is arranged at the air outlet of the heating chamber.

6. The heat pump unit of the carbon dioxide compression system for tobacco leaf curing according to claim 1, characterized in that: It also includes an electric auxiliary heater arranged in the heating chamber.

7. The heat pump unit of the carbon dioxide compression system for tobacco leaf curing according to claim 6, characterized in that: The electric auxiliary heater is located above all the air coolers.

8. The heat pump unit of the carbon dioxide compression system for tobacco leaf curing according to claim 1, characterized in that: Carbon dioxide flows through each of the carbon dioxide compression heating circuits.

9. The heat pump unit of the carbon dioxide compression system for tobacco leaf curing according to claim 1, characterized in that: The air inlet of the heating chamber is arranged at the bottom of the heating chamber. A fresh air inlet communicating with the air inlet of the heating chamber is also arranged in the heating chamber. All the air coolers are located directly above the fresh air inlet.

10. The heat pump unit of the carbon dioxide compression system for tobacco leaf curing according to claim 9, characterized in that: The bottom of the heating chamber is also provided with a moisture discharge port communicated with the air inlet.

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