Integrated carbon dioxide heat pump with heat recovery function for tobacco leaf curing

Abstract

The invention discloses an integrated carbon dioxide heat pump with a heat recovery function for tobacco leaf baking, which comprises a main circulating air duct vertically arranged in a tobacco loading chamber, a moisture removal air duct arranged below the main circulating air duct, communicated with the main circulating air duct and extending out of the tobacco loading chamber, and a heat regeneration system, the heat regeneration system comprises a closed-loop carbon dioxide refrigerant connecting pipe which is arranged in the main circulating air duct and extends to the outside of the tobacco loading chamber, and a carbon dioxide compressor, a gas-liquid separator, an evaporator and a heat regenerator which are arranged outside the tobacco loading chamber and are sequentially arranged on the carbon dioxide refrigerant connecting pipe, and a circulating fan is arranged at the top of the main circulating air duct; the device is more convenient to transport, install and maintain, and the device can be put into use after being hoisted to a use site and powered on. Meanwhile, a heat recovery function is achieved, high-temperature and high-humidity gas exhausted in the tobacco leaf curing process is secondarily utilized, the waste heat is secondarily utilized, the use energy consumption of equipment is effectively reduced, and the unit curing cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco leaf drying, and in particular to an integrated carbon dioxide heat pump with a heat recovery function for tobacco leaf baking. Background Art

[0002] At present, split heat pump units using R134a refrigerant are widely used in the domestic tobacco drying field. However, the CO2 compression system using R744 refrigerant is superior to the R134a system in terms of performance, environmental protection and economy. R744 has high energy efficiency at low temperatures, is environmentally friendly and safe, has a GWP value of 1, and does not damage the ozone layer. Its high volumetric cooling capacity reduces the system size and compressor displacement, and its thermal conductivity coefficient is also higher than that of R134a, which improves the heat exchange efficiency.

[0003] Traditional heat pump systems are mostly split structures, with the main unit (including: compressor, evaporator), air cooler, circulating fan, fresh air dehumidification port, etc. all being independent components. Refrigerant pipes also need to be installed on-site between the main unit and the air cooler, and power cables need to be connected between the fan and the electrical control box and the main unit. At the site of use, they need to be installed one by one and then debugged together. The installation is cumbersome and the time cost of personnel is high.

[0004] The existing R134a heat pump split unit has a relatively high energy consumption per kang when baking tobacco leaves. This further increases the energy consumption of the heat pump equipment and leads to an increase in baking costs, especially in high altitude areas or during periods of low ambient temperature. Summary of the invention

[0005] The object of the present invention is to provide an integrated carbon dioxide heat pump with a heat recovery function for tobacco leaf baking, so as to solve the problem of high cost of tobacco leaf baking.

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

[0007] An integrated carbon dioxide heat pump with heat recovery function for tobacco leaf baking, comprising a main circulation air duct vertically arranged in a smoke loading chamber, a dehumidification air duct arranged below the main circulation air duct and connected to the main circulation air duct and extending to the outside of the smoke loading chamber, and a heat recovery system, the heat recovery system comprising a closed-loop carbon dioxide refrigerant connecting pipe arranged in the main circulation air duct and extending to the outside of the smoke loading chamber, a carbon dioxide compressor, a gas-liquid separator, an evaporator and a heat regenerator arranged outside the smoke loading chamber and sequentially arranged on the carbon dioxide refrigerant connecting pipe, a circulating fan is arranged on the top of the main circulation air duct, and a fresh air outlet connected to the outside is opened on the side wall.

[0008] Preferably, an expansion valve is provided on the carbon dioxide refrigerant connecting pipe, and the expansion valve is provided between the evaporator and the regenerator.

[0009] Preferably, the carbon dioxide refrigerant connecting pipe located in the main circulation air duct is arranged on a support plate.

[0010] Preferably, the smoke loading chamber comprises a structural frame and a plastic-sprayed steel plate covering the outer side of the structural frame.

[0011] Preferably, a layer of thermal insulation material is laid in the main circulation air duct.

[0012] Preferably, the portion of the dehumidification air duct extending to the outside of the decoration is provided with dehumidification louvers.

[0013] Preferably, the dehumidification louver is close to the evaporator and faces the evaporator.

[0014] Preferably, the dehumidification air duct is made of stainless steel plate or hot-dip galvanized plate.

[0015] Preferably, the size of the fresh air outlet is adjustable.

[0016] Preferably, an air return port is provided at one end of the dehumidification air duct away from the dehumidification louver.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The present invention greatly reduces the complexity and risk during transportation, ensuring that the equipment can be in good condition when it arrives on site. Secondly, in terms of installation, the integrated design makes the installation process of the equipment simpler and faster, reducing the time and labor costs required for on-site installation. In terms of maintenance, since the various components and systems of the equipment have been assembled as a whole, problems can be located and repaired more efficiently during daily maintenance or troubleshooting, greatly improving the reliability and service life of the equipment. The integrated design not only improves the overall performance of the equipment, but also brings great convenience and economic benefits to users. In the field of tobacco leaf baking, the system uses a carbon dioxide compressor, an R744 refrigerant pipeline system, and incorporates a heat recovery design concept. This system significantly reduces energy consumption and tobacco leaf baking costs. Its integrated design reduces transportation risks, while reducing transportation, installation and maintenance costs, as well as later use costs, reflecting environmental protection advantages. Its high efficiency, energy saving, safety, stability, and easy maintenance are expected to bring new technological advances to the tobacco leaf baking industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Among them, 1. Carbon dioxide compressor; 2. Main circulation air duct; 3. Regenerator; 4. Expansion valve; 5. Evaporator; 6. Gas-liquid separator; 7. Cooling fan; 8. Circulating fan; 9. Fresh air inlet; 10. Dehumidification outlet; 11. Dehumidification air duct; 12. Carbon dioxide refrigerant connecting pipe; 13. Structural frame. DETAILED DESCRIPTION

[0022] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0023] The object of the present invention is to provide an integrated carbon dioxide heat pump with a heat recovery function for tobacco leaf baking, so as to solve the problem of high cost of tobacco leaf baking.

[0024] 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 embodiments.

[0025] refer to Figure 1, an integrated carbon dioxide heat pump with heat recovery function for tobacco leaf baking, comprising a main circulation air duct vertically arranged in a tobacco loading chamber, a dehumidification air duct arranged below the main circulation air duct and connected to the main circulation air duct and extending to the outside of the tobacco loading chamber, and a heat recovery system, the heat recovery system comprising a closed-loop carbon dioxide refrigerant connecting pipe arranged in the main circulation air duct and extending to the outside of the tobacco loading chamber, a carbon dioxide compressor, a gas-liquid separator, an evaporator and a heat regenerator arranged outside the tobacco loading chamber and sequentially arranged on the carbon dioxide refrigerant connecting pipe, a circulation fan is arranged on the top of the main circulation air duct, and a new air outlet connected to the outside is opened on the side wall; the present invention greatly reduces the complexity and risk during transportation, ensuring that the equipment can be kept in good condition when it arrives at the site. Secondly, in terms of installation, the integrated design makes the installation process of the equipment simpler and faster, reducing the time and labor costs required for on-site installation. In terms of maintenance, since the various components and systems of the equipment have been assembled as a whole, problems can be more efficiently located and repaired during daily maintenance or troubleshooting, greatly improving the reliability and service life of the equipment. The integrated design not only improves the overall performance of the equipment, but also brings great convenience and economic benefits to users. In the field of tobacco leaf curing, the system uses a carbon dioxide compressor, an R744 refrigerant pipeline system, and incorporates a heat recovery design concept. This system significantly reduces energy consumption and tobacco leaf curing costs. Its integrated design reduces transportation risks, as well as transportation, installation and maintenance costs, as well as later use costs, reflecting its environmental advantages. Its high efficiency and energy saving, safety and stability, and easy maintenance are expected to bring new technological advances to the tobacco leaf curing industry.

[0026] refer to Figure 1 The carbon dioxide refrigerant connecting pipe is provided with an expansion valve, and the expansion valve is arranged between the evaporator and the regenerator.

[0027] refer to Figure 1 The carbon dioxide refrigerant connecting pipe located in the main circulation air duct is arranged on a supporting plate.

[0028] Furthermore, the smoke chamber includes a structural frame and a plastic-sprayed steel plate covering the outer side of the structural frame; the thin plastic-sprayed steel plate not only improves the aesthetic appearance, but also has an anti-corrosion function, thereby extending the service life of the frame.

[0029] Furthermore, the bottom of the structural frame is welded by four channel steels, and the middle part of the frame is supplemented by welding with multiple transverse profiles, making the overall frame more stable and convenient for loading and transporting equipment. During on-site operations, the bottom frame can be used for forklift or crane loading and unloading operations.

[0030] Furthermore, a layer of thermal insulation material is laid in the main circulation air duct; low thermal conductivity materials are selected to effectively block the transfer of external temperature, ensuring that the temperature in the main circulation air duct is not lost.

[0031] Furthermore, a portion of the dehumidification air duct extending to the outside of the decoration is provided with dehumidification louvers.

[0032] Furthermore, the dehumidification louver is close to the evaporator and faces the evaporator.

[0033] Furthermore, the moisture exhaust duct is made of stainless steel plate or hot-dip galvanized plate.

[0034] Furthermore, the size of the fresh air outlet is adjustable.

[0035] Furthermore, a return air port is provided at one end of the dehumidification air duct away from the dehumidification louver.

[0036] The method of use of the present invention is as follows:

[0037] When tobacco leaves are being baked, the temperature and humidity in the baking room must be gradually increased in accordance with the process standards for tobacco leaf baking. If the humidity in the baking room is too high and it is necessary to remove excess moisture, open the fresh air vent. The fresh air is introduced into the baking room under the negative pressure generated by the circulation motor. At the same time, the dehumidification port is opened in conjunction, so that the excess hot and humid air is discharged through the dehumidification louver under the guidance of the dehumidification air duct to the vicinity of the evaporator. At the evaporator, secondary waste heat is recycled. Both the fresh air vent and the dehumidification port are controlled by adjustable analog quantities, which can control the size and angle of the switch, so as to accurately control the dehumidification amount. The dehumidification air duct is made of stainless steel plate (or hot-dip galvanized plate) to prevent rust caused by high temperature and high humidity environment. From the air outlet of the baking room to the vicinity of the evaporator, while diverting the hot and humid gas, ensure the smooth circulation of the air in the air duct.

[0038] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An integrated carbon dioxide heat pump with heat recovery function for tobacco baking, characterized in that: It includes a main circulation air duct vertically arranged in the smoke loading chamber, a dehumidification air duct arranged below the main circulation air duct and connected with the main circulation air duct and extending to the outside of the smoke loading chamber, and a heat recovery system. The heat recovery system includes a closed-loop carbon dioxide refrigerant connecting pipe arranged in the main circulation air duct and extending to the outside of the smoke loading chamber, a carbon dioxide compressor, a gas-liquid separator, an evaporator and a heat regenerator arranged outside the smoke loading chamber and sequentially arranged on the carbon dioxide refrigerant connecting pipe. A circulation fan is arranged on the top of the main circulation air duct, and a fresh air outlet connected to the outside is opened on the side wall.

2. The integrated carbon dioxide heat pump with heat recovery function for tobacco baking according to claim 1 is characterized in that: The carbon dioxide refrigerant connecting pipe is provided with an expansion valve, and the expansion valve is arranged between the evaporator and the regenerator.

3. The integrated carbon dioxide heat pump with heat recovery function for tobacco baking according to claim 1 is characterized in that: The carbon dioxide refrigerant connecting pipe located in the main circulation air duct is arranged on a supporting plate.

4. The integrated carbon dioxide heat pump with heat recovery function for tobacco baking according to claim 1, characterized in that: The smoke chamber comprises a structural frame and a plastic-sprayed steel plate covering the outer side of the structural frame.

5. The integrated carbon dioxide heat pump with heat recovery function for tobacco baking according to claim 1, characterized in that: A layer of heat-insulating material is laid in the main circulation air duct.

6. The integrated carbon dioxide heat pump with heat recovery function for tobacco baking according to claim 1, characterized in that: The portion of the dehumidification air duct extending to the outside of the decoration is provided with dehumidification louvers.

7. The integrated carbon dioxide heat pump with heat recovery function for tobacco leaf baking according to claim 6, characterized in that: The dehumidification louver is close to the evaporator and faces the evaporator.

8. The integrated carbon dioxide heat pump with heat recovery function for tobacco baking according to claim 6, characterized in that: The dehumidification air duct is made of stainless steel plate or hot-dip galvanized plate.

9. The integrated carbon dioxide heat pump with heat recovery function for tobacco baking according to claim 1, characterized in that: The size of the fresh air outlet is adjustable.

10. The integrated carbon dioxide heat pump with heat recovery function for tobacco leaf baking according to claim 7, characterized in that: An air return port is provided at one end of the dehumidification air duct away from the dehumidification louver.

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