Energy-saving type flue-cured tobacco strip aroma-keeping redrying and drying equipment

Abstract

The invention relates to an energy-saving type flue-cured tobacco redrying device which comprises a drying oven used for drying tobacco leaves or tobacco stems, the drying oven is provided with a moisture discharging opening used for discharging humid air and an air supplementing opening used for fresh air to flow in, and a recycling pipeline used for recycling the humid air is communicated between the moisture discharging opening and the air supplementing opening of the drying oven. The recycling pipeline is further provided with a condensation module used for promoting condensation of moisture in the humid air, the moisture discharging opening communicates with a moisture discharging pipeline connected with the recycling pipeline in parallel, the moisture discharging pipeline is provided with a moisture discharging fan used for sucking the humid air, and the air supplementing opening communicates with a ventilation pipeline connected with the recycling pipeline in parallel. And a circulating fan for sucking air from the air supplementing opening is also arranged in the drying oven. The energy recovery device not only can recover part of energy, but also can reduce the loss amount of aromatic substances of tobacco leaves, reduce the influence of discharged humid and hot air on the quality of tobacco flakes, and reduce the pollution to the environment at the same time.

Description

Technical Field

[0001] The invention relates to the field of tobacco leaf threshing and redrying equipment in the tobacco industry, and in particular to energy-saving tobacco leaf aroma-preserving and redrying drying equipment. Background Art

[0002] The tobacco leaf re-drying machine and tobacco stem re-drying machine used in the tobacco leaf threshing and re-drying production line are mainly used to dry, cool, and rehumidify tobacco leaves. However, during the drying, cooling, and rehumidification process of tobacco leaves, the humid air in the re-drying machine still carries a lot of heat. This humid air can no longer be used to dry the materials in the re-drying machine. The only way is to increase the baking temperature, directly exhaust the humid and hot air, and add fresh air to the re-drying machine. However, this will waste a lot of energy, and at the same time, the aromatic substances in the tobacco leaves will continue to be lost as the humid and hot air is exhausted, reducing the quality of the tobacco leaves.

[0003] In summary, the current method of exhausting hot and humid air during the re-roasting process will waste a lot of energy and reduce the quality of the tobacco leaves. In addition, the high-temperature hot and humid air will also pollute the environment. Summary of the invention

[0004] The present invention solves the problem that the hot and humid air is directly discharged during the re-drying process, which wastes a lot of energy, reduces the quality of tobacco leaves, and the high-temperature hot and humid air also pollutes the environment. An energy-saving tobacco leaf aroma-preserving re-drying and drying device is provided to solve the technical problem. A part of the hot and humid air discharged by the re-drying equipment is recovered, and the moisture in the humid air in this part of the hot and humid air is condensed, which can not only recover a part of the energy, but also reduce the loss of aromatic substances in the tobacco leaves, reduce the influence of the discharged hot and humid air on the quality of the tobacco leaves, and reduce the pollution to the environment.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] An energy-saving tobacco leaf aroma-preserving redrying and drying device comprises an oven for drying tobacco leaves or tobacco stems, the oven having a dehumidification port for discharging moist air and an air supply port for inflowing fresh air, a recovery pipe for recovering moist air being connected between the dehumidification port and the air supply port of the oven, the recovery pipe is further provided with a condensation module for promoting condensation of moisture in the moist air, the dehumidification port is connected with a dehumidification pipe connected in parallel with the recovery pipe, the dehumidification pipe is provided with a dehumidification fan for extracting moist air, the air supply port is connected with a ventilation pipe connected in parallel with the recovery pipe, and a circulating fan for extracting air from the air supply port is further provided in the oven.

[0007] Preferably, the dehumidification duct and the ventilation duct are both provided with an adjusting damper for adjusting the gas flow.

[0008] Preferably, a heater for heating the air entering the air supply port is also provided in the air supply port, and the air inlet of the circulating fan is connected to the air outlet of the heater.

[0009] Preferably, the air supply port is also provided with a preheating module for preheating the air entering the air supply port, and the preheating module is connected to the condensation module through a heat exchange pipeline, and the heat exchange pipeline includes an evaporator located in the condensation module, a condenser located in the preheating module, and a refrigerant pipeline connected between the evaporator and the condenser.

[0010] Preferably, the recovery pipeline is divided into two sections by the condensation module, and a section of the recovery pipeline connected to the air inlet of the condensation module is also provided with a filter.

[0011] Preferably, the recovery pipe is divided into two sections by the condensation module, and the section of the recovery pipe connected to the air outlet of the condensation module is also provided with an air supply fan for supplying the air processed by the condensation module to the air supply port.

[0012] Preferably, the recovery pipe is divided into two sections by a condensation module, and each of the two sections of the recovery pipe is connected to a humidity sensor.

[0013] Preferably, the oven is provided with at least one, and the moisture outlet of each oven is connected to the air supply outlet of at least one oven through a recovery pipe.

[0014] Beneficial technical effects of the technical solution of the present invention:

[0015] (1) A recovery pipe is connected between the dehumidification port and the air supply port of the oven, and the dehumidification port of the oven is connected to a dehumidification pipe connected in parallel with the recovery pipe; the air supply port of the oven is connected to a ventilation pipe connected in parallel with the recovery pipe. A part of the hot and humid air discharged from the dehumidification port flows into the air supply port through the recovery pipe, which can not only recover the heat of this part of the hot and humid air, but also reduce the loss of aromatic substances in the tobacco leaves. In addition, recycling part of the hot and humid air can also reduce the amount of hot and humid air directly discharged, reducing pollution to the environment. A condensation module for promoting the condensation of moisture in the humid air is installed on the recovery pipe. The condensation module is used to reduce the moisture in the recovered air to meet the working requirements of the re-drying machine.

[0016] (ii) Both the dehumidification duct and the ventilation duct are provided with an adjusting damper for adjusting the gas flow rate. By adjusting the damper to control the flow rate of the dehumidification duct and the ventilation duct, the amount of discharged humid and hot air can be changed, and the amount of fresh air can also be supplemented.

[0017] (III) The air supply port is provided with a preheating module for preheating the air entering the air supply port, and the preheating module is connected to the condensation module through a heat exchange pipeline. The refrigerant in the heat exchange pipeline absorbs the heat of the humid hot air in the condensation module, promotes the condensation of the moisture in the humid hot air in the condensation module, and heats the air entering the air supply port in the preheating module, thereby reducing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a re-baking device in an embodiment of the present invention is shown;

[0019] Figure 2 The schematic diagram of the structure of the heat exchange pipeline, the condensation module and the preheating module in the embodiment of the present invention is shown;

[0020] Figure 3 It shows a schematic structural diagram of two ovens sharing one condensation module in an embodiment of the present invention;

[0021] Figure 4 A schematic structural diagram showing two ovens cross-connected through two condensation modules in an embodiment of the present invention is shown.

[0022] Markings in the accompanying drawings:

[0023] 1- oven; 11- preheating module; 12- heater; 13- circulation fan; 14- conveying mesh plate; 2- dehumidification outlet; 21- dehumidification pipe; 22- dehumidification fan; 3- air supply outlet; 31- ventilation pipe; 4- recovery pipe; 41- condensation module; 42- filter; 43- air supply fan; 44- humidity sensor; 5- heat exchange pipeline; 51- evaporator; 52- condenser; 53- refrigerant pipe; 6- damper. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present invention clearer, the energy-saving tobacco flavor preservation and redrying drying equipment proposed by the present invention is further described in detail in combination with the accompanying drawings and specific implementation methods. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the implementation method of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so it has no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0025] The following will be combined with the attached Figures 1 to 4 The technical solution of an energy-saving tobacco leaf aroma-preserving redrying and drying equipment of the present invention is described in detail with specific embodiments.

[0026] Example

[0027] like Figures 1 to 4 As shown, an energy-saving tobacco leaf aroma-preserving redrying and drying device of the present embodiment comprises an oven 1 for drying tobacco leaves or tobacco stems, the oven 1 having a dehumidification port 2 for discharging moist air and an air supply port 3 for inflowing fresh air, a recovery pipe 4 for recovering moist air is connected between the dehumidification port 2 and the air supply port 3 of the oven 1, the recovery pipe 4 is further provided with a condensation module 41 for promoting condensation of moisture in the moist air, the dehumidification port 2 is connected with a dehumidification pipe 21 connected in parallel with the recovery pipe 4, the dehumidification pipe 21 is provided with a dehumidification fan 22 for extracting moist air, the air supply port 3 is connected with a ventilation pipe 31 connected in parallel with the recovery pipe 4, and a circulating fan 13 for extracting air from the air supply port 3 is further provided in the oven 1.

[0028] The recovery pipe 4 is divided into two sections by the condensation module 41. The recovery pipe 4 connected to the air inlet of the condensation module 41 is also provided with a filter 42, which can filter out the impurities in the hot and humid air. The recovery pipe 4 connected to the air outlet of the condensation module 41 is equipped with an air supply fan 43 for supplying the air processed by the condensation module 41 to the air supply port 3. The air supply fan 43 can make the hot and humid air flowing out of the moisture outlet 2 flow along the recovery pipe 4, pass through the filter 42, the condensation module 41 and the air supply fan 43 in sequence, and finally flow to the air supply port 3 of the oven 1. In addition, both recovery pipes 4 are also equipped with a humidity sensor 44 to monitor the air humidity before and after passing through the condensation module 41, and understand the working efficiency of the condensation module 41 in real time.

[0029] In addition, the air supply port 3 of the oven 1 is also equipped with a preheating module 11 for preheating the air entering the air supply port 3. The preheating module 11 is connected to the condensation module 41 through a heat exchange pipeline 5. The heat exchange pipeline 5 includes an evaporator 51 located in the condensation module 41, a condenser 52 located in the preheating module 11, and a refrigerant pipeline 53 connected between the evaporator 51 and the condenser 52. The refrigerant in the heat exchange pipeline 5 absorbs the heat of the humid hot air in the evaporator 51 and gradually evaporates into a gaseous state; the gaseous refrigerant then releases heat to the condenser 52 to preheat the air flowing through the preheating module 11. In a specific embodiment, the evaporator 51 and the condenser 52 can both use heat exchange tubes, and the refrigerant flows in the heat exchange tubes of the evaporator 51 and the condenser 52. The air flowing in the condensation module 41 and the preheating module 11 contacts the outer surface of the heat exchange tube, thereby exchanging heat with the refrigerant in the heat exchange tube.

[0030] The oven 1 in this embodiment is a tunnel oven 1. The hot and humid air discharged from the dehumidification port 2 of the tunnel oven 1 is adjusted by the damper 6 of the dehumidification duct 21. A part of the hot and humid air is discharged by the dehumidification fan 22, and a part of the hot and humid air is filtered by the filter 42 and enters the condensation module 41. After being dehumidified by the condensation module 41, the circulating hot air with residual temperature is continuously sent to the air supply port 3 of the oven 1 through the air supply fan 43. The circulating hot air with residual temperature is preheated by the preheating module 11 arranged below the air supply port 3 of the oven 1.

[0031] The interior of the tunnel type oven 1 is provided with a hot air circulation chamber and a drying chamber which are connected, the dehumidification port 2 is connected with the drying chamber, the air supply port 3 is connected with the hot air circulation chamber, the preheating module 11 and the circulating fan 13 are both installed in the hot air circulation chamber, the air inlet of the preheating module 11 is connected with the air supply port 3 of the oven 1, and the hot air circulation chamber is also provided with a heater 12 which is connected with the air outlet of the preheating module 11, and the heater 12 is used to continue to heat the preheated circulating hot air. The circulating fan 13 is installed at the air outlet of the heater 12, and transports the gas heated by the heater 12 to the drying chamber to dry the tobacco leaves or tobacco stems in the drying chamber, completing the recycling of the circulating hot air, forming an open loop circuit for the hot air recycling of the re-drying equipment, and improving the drying degree of the circulating hot air, thereby reducing the requirements for the drying temperature and reducing the flow rate of the external circulating hot air; achieving low-temperature and aroma-preserving drying of tobacco leaves; at the same time, the heat released by the humid hot air during dehumidification in the condensation module 41 is transported to the preheating module 11 through the refrigerant pipe 53, which is used to preheat the dehumidified air and the supplementary fresh air, thereby realizing the recycling of heat.

[0032] like Figure 2 As shown, the condensation module 41 has an air inlet and an air outlet, and the air outlet of the condensation module 41 is connected to an air supply fan 43. A collecting box is provided at the lower part of the condensation module 41, and the collecting box is connected to the interior of the condensation module 41, and the air inlet of the condensation module 41 is connected to the moisture outlet 2 of the oven 1 through a recovery pipe 4. The preheating module 11 is installed below the air supply port 3 of the oven 1, and a heat exchange pipeline 5 is installed between the preheating module 11 and the condensation module 41, so as to continuously transfer the heat in the condensation module 41 to the preheating module 11. After the air with heat and moisture is discharged from the moisture outlet 2 of the drying oven 1 and enters the condensation module 41, the moisture in the air contacts the evaporator 51 of the heat exchange pipeline 5 to form water droplets that drip downward into the collection box, and the air with residual temperature continues to be sent to the preheating module 11 through the air supply fan 43 for preheating. The preheated air is further heated by the heater 12 and finally transported to the drying chamber by the circulating fan 13, passes through the conveying mesh plate 14 in the drying chamber, promotes the drying of the tobacco slices or stems in the drying chamber, and completes the recycling of the hot air.

[0033] It should be understood that the number of ovens 1 and condensation modules 41 does not need to completely correspond. Figure 3 As shown, there are multiple tunnel ovens 1, and only one condensation module 41 is configured. The hot and humid air discharged from multiple ovens 1 is collected into a recovery pipe 4 and transported to the same condensation module 41. The collected hot and humid air is dehumidified by the condensation module 41, and then the dehumidified air is sent to the air supply port 3 of each oven 1. The dehumidified air and the supplemented fresh air are preheated by the preheating module 11, and then continued to be heated by the heater 12. Finally, the circulating fan 13 is transported to the tunnel through the conveying mesh plate 14 to complete the recycling of the circulating hot air; improve the drying degree of the circulating hot air, reduce the baking temperature of tobacco leaves, and reduce the flow rate of the external circulating hot air; realize the low-temperature aroma preservation and drying of tobacco leaves; at the same time, the heat absorbed from the circulating hot air exchange during the dehumidification process of the condensation module 41 is transported to the preheating module 11 through the heat exchange pipeline 5 for preheating the dehumidified air and the supplemented fresh air, so as to realize the recycling of heat.

[0034] In addition, the oven 1 and the condensation module 41 may also be cross-configured, such as Figure 4 As shown, there are two tunnel ovens 1 and two condensation modules 41. The dehumidification port 2 and the air supply port 3 connected to each condensation module 41 belong to two ovens 1 respectively, so that the condensation module 41 is cross-connected with the two ovens 1. The condensation module 41 dehumidifies the hot and humid air discharged from the tunnel oven 1, and the dehumidified air is sent to the air supply port 3 of another oven 1. The heat generated by the condensation module 41 after dehumidification is transmitted to the heat pump preheating module 11 through the refrigerant of the heat pump to preheat the dehumidified air and the supplemented fresh air; the condensation module 41 dehumidifies the hot and humid air discharged from the oven 1, and the dehumidified air is sent to the air supply port 3 of the oven 1. The heat generated by the condensation module 41 after dehumidification is transmitted to the preheating module 11 through the heat exchange pipeline 5 to preheat the dehumidified air and the supplemented fresh air. The cross configuration of the oven 1 and the condensation module 41 can mix the gases from different ovens 1 , thereby exchanging the gases and aromatic substances in the two ovens 1 , thereby improving the consistency of the quality of the tobacco sheets in the two ovens 1 .

[0035] The above-mentioned redrying equipment was repeatedly verified through principle tests, and the following experimental conclusions were obtained: when the equipment was used to dry tobacco leaves, after the tobacco leaves were redryed and dried in three drying zones in the redrying and drying section, the temperature of the tobacco leaves after drying dropped from 75°C to 63°C; the smoking score of the tobacco leaf aroma retention increased from 85 points to 87.2 points; the requirements for low-temperature aroma preservation and drying of tobacco leaves were met.

[0036] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An energy-saving tobacco strip aroma preservation and redrying drying equipment, characterized in that: The invention comprises an oven for drying tobacco leaves or tobacco stems, the oven having a dehumidification port for discharging moist air and an air supply port for inflowing fresh air, a recovery pipe for recovering moist air being connected between the dehumidification port and the air supply port of the oven, the recovery pipe is also provided with a condensation module for promoting condensation of water in the moist air, the dehumidification port is connected with a dehumidification pipe connected in parallel with the recovery pipe, the dehumidification pipe is provided with a dehumidification fan for extracting moist air, the air supply port is connected with a ventilation pipe connected in parallel with the recovery pipe, and a circulating fan for extracting air from the air supply port is also provided in the oven.

2. The energy-saving tobacco strip aroma-preserving redrying and drying equipment according to claim 1, characterized in that: The dehumidification duct and the ventilation duct are both provided with an adjusting damper for adjusting the gas flow.

3. The energy-saving tobacco strip aroma-preserving redrying and drying equipment according to claim 1, characterized in that: A heater for heating the air entering the air supply port is also provided in the air supply port, and the air inlet of the circulating fan is connected to the air outlet of the heater.

4. The energy-saving tobacco strip aroma-preserving redrying and drying equipment according to claim 1, characterized in that: The air supply port is also provided with a preheating module for preheating the air entering the air supply port. The preheating module is connected to the condensation module through a heat exchange pipeline. The heat exchange pipeline includes an evaporator located in the condensation module, a condenser located in the preheating module, and a refrigerant pipeline connected between the evaporator and the condenser.

5. The energy-saving tobacco strip aroma-preserving redrying and drying equipment according to claim 1, characterized in that: The recovery pipeline is divided into two sections by the condensation module, and a section of the recovery pipeline connected to the air inlet of the condensation module is also provided with a filter.

6. The energy-saving tobacco strip aroma-preserving redrying and drying equipment according to claim 1, characterized in that: The recovery pipe is divided into two sections by the condensation module, and the recovery pipe connected to the air outlet of the condensation module is also provided with an air supply fan for supplying the air processed by the condensation module to the air supply port.

7. The energy-saving tobacco strip aroma-preserving redrying and drying equipment according to claim 1, characterized in that: The recovery pipe is divided into two sections by the condensation module, and each of the two sections of the recovery pipe is connected to a humidity sensor.

8. The energy-saving tobacco strip aroma-preserving redrying and drying equipment according to any one of claims 1 to 7, characterized in that: The oven is provided with at least one, and the moisture outlet of each oven is connected with the air supply outlet of at least one oven through a recovery pipeline.

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