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

Abstract

The utility model 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 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 utility model relates to tobacco leaf drying technical field especially is related to a carbon dioxide heat pump with heat recovery function for tobacco leaf baking. BACKGROUND

[0002] At present, the split heat pump unit of R134a refrigerant is generally used in the domestic tobacco drying field. However, the CO2 compression system of R744 refrigerant is superior to R134a system in performance, environmental protection and economy. R744 has high energy efficiency at low temperature, is environmentally friendly and safe, has a GWP value of 1, and does not destroy the ozone layer. Its high volumetric ratio cooling capacity reduces the system size and compressor displacement, and the heat transfer coefficient is higher than that of R134a, which improves the heat exchange efficiency.

[0003] The traditional heat pump system is mostly split type structure, and the host (including: compressor, evaporator), air cooler, circulating fan, fresh air exhaust port and the like are independent components. The refrigerant pipeline needs to be installed between the host and the air cooler on site, and the power cable needs to be connected between the fan, the electric control box and the host. In the use site, they need to be installed one by one and then jointly debugged. The installation is complicated, and the personnel time cost is high.

[0004] The existing R134a heat pump split unit consumes relatively high energy per kiln when baking tobacco leaves. Especially in high-altitude areas or during periods of low ambient temperature, this further increases the energy consumption of the heat pump equipment and leads to an increase in baking cost. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a carbon dioxide heat pump with heat recovery function for tobacco leaf baking, to solve the problem of high tobacco leaf baking cost.

[0006] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0007] A carbon dioxide heat pump with heat recovery function for tobacco leaf baking, comprising a main circulating air duct vertically arranged in a tobacco loading chamber, a dehumidification air duct arranged below the main circulating air duct and communicating with the main circulating 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 circulating 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 recovery device arranged in sequence on the carbon dioxide refrigerant connecting pipe arranged outside the tobacco loading chamber, a circulating fan arranged at the top of the main circulating air duct, and a fresh air inlet arranged on the side wall and communicating with the outside.

[0008] Preferably, an expansion valve is arranged on the carbon dioxide refrigerant connecting pipe, and the expansion valve is arranged between the evaporator and the heat recovery device.

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

[0010] Preferably, the tobacco loading chamber comprises a structural frame and a plastic-coated steel plate covering the outside of the structural frame.

[0011] Preferably, the main circulating air duct is lined with a layer of thermal insulation material.

[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 louvers are located close to and facing the evaporator.

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

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

[0016] Preferably, the dehumidification air duct is provided with a return air inlet at the end away from the dehumidification louvers.

[0017] The present utility model has achieved the following technical effects compared with the prior art:

[0018] The present utility model greatly reduces the complexity and risk in the transportation process, ensures that the equipment can maintain a good state when it arrives at the site. Secondly, in terms of installation, the integrated design makes the installation process of the equipment more convenient and fast, reducing the time and labor cost required for on-site installation. In terms of maintenance, since each component and system of the equipment has been assembled into a whole, when performing routine maintenance or troubleshooting, the problem can be located and repaired more efficiently, 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 the user. In the tobacco curing field, the system adopts a carbon dioxide compressor, an R744 refrigerant pipe system, and incorporates a heat recovery design concept. This system significantly reduces energy consumption and tobacco curing costs. Its integrated design reduces transportation risks, while reducing transportation, installation and maintenance costs, as well as later use costs, reflecting environmental advantages. Its efficient energy saving, safety and stability, and ease of maintenance features are expected to bring new technological progress to the tobacco curing industry. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

[0020] Figure 1 The structure of the present application is shown in the figure.

[0021] 1, carbon dioxide compressor; 2, main circulating air duct; 3, regenerator; 4, expansion valve; 5, evaporator; 6, gas-liquid separator; 7, heat dissipation fan; 8, circulating fan; 9, fresh air outlet; 10, exhaust outlet; 11, exhaust air duct; 12, carbon dioxide refrigerant connecting pipe; 13, structural frame. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0023] The purpose of the present application is to provide a carbon dioxide heat pump with heat recovery function for tobacco leaf baking, to solve the problem of high cost of tobacco leaf baking.

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be described in further detail in combination with the drawings and specific embodiments.

[0025] Reference Figure 1The utility model provides a kind of integrated carbon dioxide heat pump with heat recovery function for tobacco curing, including main circulating air duct being vertically arranged in tobacco chamber, wet exhaust air duct being arranged below the main circulating air duct and being communicated with the main circulating air duct and extending to outside the tobacco chamber and heat recovery system, the heat recovery system includes closed loop carbon dioxide refrigerant connecting pipe being arranged in the main circulating air duct and extending to outside the tobacco chamber, carbon dioxide compressor, gas-liquid separator, evaporator and heat regenerator being arranged in sequence on the carbon dioxide refrigerant connecting pipe outside the tobacco chamber, circulating fan is arranged on the top of the main circulating air duct, and fresh air inlet is opened on the side wall and communicated with outside;The utility model greatly reduces the complexity and risk in the process of transportation, ensures that equipment can maintain good state when reaching site.Secondly, in the installation aspect, the integrated design makes the installation process of equipment more simple and fast, reduces the time and labor cost required for field installation.In maintenance aspect, since each component and system of equipment has been assembled as a whole, when carrying out routine maintenance or troubleshooting, problem can be located more efficiently and repaired, greatly improving the reliability and service life of equipment.The integrated design not only improves the overall performance of equipment, but also brings great convenience and economic benefits to users.In tobacco curing field, the system adopts carbon dioxide compressor, R744 refrigerant pipeline system and integrates heat recovery design concept.This system significantly reduces energy consumption and tobacco curing cost.The integrated design reduces transportation risk, reduces transportation, installation and maintenance cost and later use cost, and embodies environmental protection advantage.Its efficient energy saving, safe and stable and easy-to-maintain characteristics are expected to bring new technical progress to tobacco curing industry.

[0026] Reference Figure 1 Expansion valve is arranged on the carbon dioxide refrigerant connecting pipe, and the expansion valve is arranged between the evaporator and the heat regenerator.

[0027] Reference Figure 1 The carbon dioxide refrigerant connecting pipe in the main circulating air duct is arranged on the support plate.

[0028] Further, the tobacco chamber includes a structural frame and a thin plastic-coated steel plate covering the outside of the structural frame.

[0029] Further, the bottom of the structural frame is welded by four channel steels, and the middle part of the frame is supplemented by welding multiple horizontal profiles, so that the overall frame is more stable, facilitating the loading and transportation of the equipment.

[0030] Further, the main circulating air duct is coated with a layer of thermal insulation material; a low thermal conductivity material is selected to effectively block the transmission of external temperature, ensuring that the temperature in the main circulating air duct does not dissipate.

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

[0032] Further, the dehumidification louvers are close to the evaporator and face the evaporator.

[0033] Further, the dehumidification air duct is made of stainless steel plate or hot-dipped galvanized sheet.

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

[0035] Further, the dehumidification air duct is made of stainless steel plate or hot-dipped galvanized sheet.

[0036] The use method of the utility model is as follows:

[0037] During tobacco leaf curing, the temperature and humidity in the curing barn need to be gradually increased according to the process standard of tobacco leaf curing. When the humidity in the curing barn is too high and the excess humidity needs to be removed, the fresh air outlet is opened. The fresh air is introduced into the curing barn under the negative pressure generated by the circulating motor. At the same time, the dehumidification outlet is opened in linkage, so that the excess hot and humid air is discharged through the dehumidification louvers under the guidance of the dehumidification air duct and reaches the vicinity of the evaporator. At the evaporator, secondary waste heat recovery is carried out. The fresh air outlet and the dehumidification outlet are both adjustable analog control, which can control the size and angle of the switch, thereby accurately controlling the dehumidification amount. The dehumidification air duct is made of stainless steel plate (or hot-dipped galvanized sheet) to prevent rust caused by high temperature and high humidity environment. From the outlet of the curing barn to the vicinity of the evaporator, the wet and hot gas is branched, and at the same time, the air is ensured to circulate smoothly in the air duct.

[0038] The principle and implementation mode of the utility model are described by applying specific examples in the utility model; the above description of the embodiments is only used to help understand the method of the utility model and its core idea; at the same time, for those skilled in the art, according to the idea of the utility model, the specific implementation mode and application range will be changed. In conclusion, the content of the specification should not be understood as a limitation of the utility model.

Claims

1. An integrated carbon dioxide heat pump with heat recovery function for tobacco curing, characterized in that, The system includes a main circulating air duct vertically installed inside the smoke loading chamber, a dehumidification air duct located below and connected to the main circulating air duct and extending to the outside of the smoke loading chamber, and a regeneration system. The regeneration system includes a closed-loop carbon dioxide refrigerant connection pipe installed inside the main circulating air duct and extending to the outside of the smoke loading chamber, a carbon dioxide compressor, a gas-liquid separator, an evaporator, and a regenerator installed outside the smoke loading chamber and sequentially installed on the carbon dioxide refrigerant connection pipe. A circulating fan is installed at the top of the main circulating air duct, and a fresh air inlet connected to the outside is opened on the side wall.

2. The integrated carbon dioxide heat pump with heat recovery function for tobacco curing according to claim 1, characterized in that, An expansion valve is installed on the carbon dioxide refrigerant connection pipe, and the expansion valve is located between the evaporator and the regenerator.

3. The integrated carbon dioxide heat pump with heat recovery function for tobacco curing according to claim 1, characterized in that, The carbon dioxide refrigerant connection pipe located in the main circulation duct is mounted on the support plate.

4. The integrated carbon dioxide heat pump with heat recovery function for tobacco curing according to claim 1, characterized in that, The smoke chamber includes a structural frame and a powder-coated steel plate covering the outside of the structural frame.

5. The integrated carbon dioxide heat pump with heat recovery function for tobacco curing according to claim 1, characterized in that, The main circulating air duct is lined with a layer of thermal insulation material.

6. The integrated carbon dioxide heat pump with heat recovery function for tobacco curing according to claim 1, characterized in that, The portion of the exhaust duct extending to the outside of the smoke loading room is equipped with exhaust louvers.

7. The integrated carbon dioxide heat pump with heat recovery function for tobacco curing according to claim 6, characterized in that, The dehumidifying louvers are located near and directly opposite the evaporator.

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

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

10. The integrated carbon dioxide heat pump with heat recovery function for tobacco curing according to claim 7, characterized in that, The end of the dehumidification duct away from the dehumidification louvers has a return air vent.

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