Tobacco leaf modified atmosphere system and gas circulation method

Abstract

The present disclosure provides a tobacco leaf conditioning system and a gas circulation method. The tobacco leaf conditioning system includes two warehouses (10) for storing tobacco stacks (100), at least two air bags (20) arranged in the two warehouses (10), the air bags (20) having an inflation state and a deflation state, a first gas transmission part in communication with the two warehouses (10) and configured to provide nitrogen and / or transfer nitrogen between the two warehouses (10), and a second gas transmission part in communication with the at least two air bags (20) and configured to transfer air between the air bags (20) located in the two warehouses (10).

Description

Technical Field

[0001] This disclosure relates to the field of controlled atmosphere storage technology for tobacco leaves, and particularly to a controlled atmosphere system and air circulation method for tobacco leaves. Background Technology

[0002] Controlled atmosphere storage of tobacco leaves creates a low-oxygen environment by precisely regulating the gas composition within the storage chamber (e.g., reducing oxygen and increasing nitrogen concentration) while simultaneously controlling temperature and humidity. This seals the tobacco stacks, thereby safely and environmentally preventing tobacco pests and mold, and improving the quality of tobacco aging.

[0003] Tobacco leaves are stacked in a sealed storage silo. A nitrogen generator produces nitrogen gas with a concentration greater than 99.5%, which is then pumped into the silo through an exhaust vent until the oxygen concentration drops below 2%. This low-oxygen environment is then maintained for more than 30 days before the silo doors are opened to dissipate gas until the oxygen concentration returns to 20.9%. Therefore, tobacco pests can suffocate and die under prolonged low-oxygen conditions.

[0004] However, after the controlled atmosphere operation is completed, the used gases are directly discharged outside the storage tank, resulting in resource waste. In addition, the process of reducing the oxygen concentration during controlled atmosphere operation is time-consuming, leading to low efficiency. Summary of the Invention

[0005] The purpose of this disclosure is to provide a tobacco modified atmosphere system and air circulation method, which aims to avoid resource waste in the modified atmosphere operation process and improve the efficiency of the modified atmosphere operation.

[0006] The first aspect of this disclosure provides a tobacco modified atmosphere system, comprising: Two storage silos, used to store tobacco stacks; At least two airbags are placed in two separate storage compartments, and the airbags have both inflated and deflated states. A first gas transfer unit, connected to two storage chambers, is configured to provide nitrogen and / or transfer nitrogen between the two storage chambers; and The second gas transfer unit, in communication with at least two airbags, is configured to transfer air between the airbags located in two storage chambers.

[0007] In some embodiments, the tobacco modified atmosphere system further includes: The detection device is configured to detect oxygen concentration and / or nitrogen concentration in two storage chambers; and The control device, which is signal-connected to the detection device, the first gas transmission unit, and the second gas transmission unit, is configured to adjust the nitrogen delivery volume of the first gas transmission unit and / or adjust the air delivery volume of the second gas transmission unit according to the detection result of the detection device.

[0008] In some embodiments, the nitrogen delivery rate and the air delivery rate are equal.

[0009] In some embodiments, the first gas transmission unit includes a nitrogen generator, the inlet of which is connected to at least one storage tank.

[0010] In some embodiments, the storage compartment contains at least two airbags; wherein... The second gas transmission unit is connected in series and / or in parallel with at least two airbags in the same storage compartment.

[0011] In some embodiments, the storage compartment contains at least two airbags; wherein... At least two airbags within the same storage compartment are configured to cover at least two surfaces of the smoke stack when inflated.

[0012] In some embodiments, the total volume of the airbags in the storage compartment when inflated occupies at least 1 / 3 of the volume of the storage compartment.

[0013] A second aspect of this disclosure provides a gas circulation method, comprising: S1. Obtain a gas source and produce nitrogen; S2. Introduce nitrogen gas into one of the storage chambers; S3. Before the oxygen concentration in the nitrogen-introduced storage chamber drops to the preset concentration value, introduce air into the airbag in another storage chamber until the airbag is inflated. S4. Transfer nitrogen between the two storage chambers and transfer air between the air bladders of the two storage chambers.

[0014] In some embodiments, the first gas transmission unit includes a nitrogen generator and a first fan. The air inlet of the nitrogen generator is connected to the outside of the two storage chambers or to one of the storage chambers. The first fan is connected between the two storage chambers. The second gas transmission unit includes a second fan, which is connected between the air bladders of the two storage chambers. S1 also includes: S11. Connect the nitrogen generator's air inlet to the outside of the two storage chambers; and / or S4 also includes: S41. Turn off the nitrogen generator and turn on the first fan to transfer nitrogen from the two storage chambers; and S42. Turn on the second fan to transfer the air from the airbags in the two storage compartments.

[0015] In some embodiments, the first gas transmission unit includes a nitrogen generator, the inlet of which is connected to the outside of the two storage chambers or to one of the storage chambers; the second gas transmission unit includes a second fan, which is connected between the air bladders of the two storage chambers. S1 also includes: S12, Connect the nitrogen generator's air inlet to the outside of the two storage chambers; and / or S4 also includes: S43. The air inlet of the nitrogen generator is connected to the storage chamber when the air bag is in the deflating state, and the exhaust port of the nitrogen generator is connected to the storage chamber when the air bag is in the inflating state; and S44. Turn on the second fan to transfer the air from the airbags in the two storage compartments.

[0016] In some embodiments, the air circulation method further includes: S5. After S4, turn on the nitrogen generator and ensure that both the nitrogen generator's inlet and outlet are connected to the storage chamber where the air bag is in the evacuation state.

[0017] Based on the tobacco controlled atmosphere system provided in this embodiment, a first gas transfer unit is provided for nitrogen transfer between two storage chambers, and a second gas transfer unit is provided for air transfer between air bladders built into the two storage chambers. The first and second gas transfer units work together to achieve the recycling of nitrogen and air, which helps to reduce resource consumption. In addition, controlling the atmosphere of both storage chambers simultaneously, with nitrogen and air transferred independently, helps to improve the efficiency of the controlled atmosphere operation.

[0018] The gas recirculation method disclosed herein is based on the tobacco controlled atmosphere system of the above embodiments. It achieves gas recycling by transferring nitrogen between two storage chambers and air between the air bladders in the two chambers, avoiding direct emission of gas used during the controlled atmosphere process and reducing gas resource waste. Furthermore, the alternating nitrogen filling and oxygen reduction in the two storage chambers, along with the air venting through the inflation of the air bladders, accelerates the oxygen reduction rate within the chambers, shortens the oxygen reduction time, and improves the efficiency of the controlled atmosphere operation.

[0019] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this application, illustrate exemplary embodiments of this disclosure and are used to explain this disclosure, but do not constitute an undue limitation of this disclosure. In the drawings: Figure 1 This is a schematic diagram of the structure of a tobacco modified atmosphere system according to some embodiments of the present disclosure, with arrows representing airflow directions.

[0021] Figure 2 This is a schematic diagram of the structure of a tobacco modified atmosphere system according to other embodiments of this disclosure, with arrows indicating airflow direction.

[0022] Figure 3This is a schematic diagram of the structure of the airbag and the second fan connected in parallel in the same storage compartment according to some embodiments of this disclosure.

[0023] Figure 4 This is a schematic diagram showing the connection between the storage tank and the nitrogen generator in some embodiments of this disclosure.

[0024] Figure 5 This is a schematic diagram of the structure of a storage bin with sealing grooves arranged around the bin door and on the ground, according to some embodiments of this disclosure.

[0025] Figure 6 This is a schematic diagram of the structure of the first sealing section according to some embodiments of this disclosure.

[0026] Figure 7 This is a schematic diagram of the structure of the second sealing section according to some embodiments of this disclosure.

[0027] Figure 8 This is a schematic diagram of the structure of the third sealing section in some embodiments of this disclosure.

[0028] Figure 9 This is a schematic diagram of the structure of the first gas transmission section located on both sides of the sealing membrane along the thickness direction, according to some embodiments of this disclosure.

[0029] Explanation of reference numerals in the attached figures: 3. Nitrogen generator; 4. Second fan; 5. First fan; 10. Storage silo; 20. Airbag; 31. Main exhaust pipe; 32. Main return pipe; 33. Control valve; 34. Exhaust branch pipe; 35. Return branch pipe; 36. Connector; 37. Three-way valve; 201. Ground; 202. Front wall; 204. Door; 205. Fitting part; 210. Sealing groove; 211. First sealing section; 212. Second sealing section; 213. Third sealing section; 220. Sealing membrane; 100. Chimney stacks. Detailed Implementation

[0030] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0032] In the description of this disclosure, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this disclosure.

[0033] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are generally based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0034] like Figures 1 to 9 As shown, this disclosure provides a tobacco modified atmosphere system. The tobacco modified atmosphere system includes: Two storage bins 10, storage bins 10 are used to store tobacco stacks 100; At least two airbags 20 are placed in two storage compartments 10, and the airbags 20 have an inflated state and a deflated state; A first gas transfer unit, connected to two storage chambers 10, is configured to provide nitrogen and / or transfer nitrogen between the two storage chambers 10; and The second gas transfer unit, which is in communication with at least two airbags 20, is configured to transfer air between the airbags 20 located in the two storage chambers 10.

[0035] The airbag 20 can be made of polyamide-polyethylene composite film. When the smoke stack 100 is not placed in the storage silo 10, the airbag 20 is in a deflated state to facilitate the movement and operation of tools within the storage silo 10.

[0036] Based on the tobacco controlled atmosphere system provided in this embodiment, a first gas transfer unit is provided to transfer nitrogen between two storage chambers, and a second gas transfer unit is provided to transfer air between the air bags 20 built into the two storage chambers 10. The first and second gas transfer units work together to achieve the recycling of nitrogen and air, which helps to reduce resource consumption. In addition, controlling the atmosphere of the two storage chambers simultaneously, with nitrogen and air transferred independently, helps to improve the efficiency of the controlled atmosphere operation.

[0037] In some embodiments, each storage bin 10 is capable of holding at least 200 stacks of smoke 100, with a gap between every two stacks of smoke 100 to improve the flow efficiency of nitrogen within the storage bin 10.

[0038] In some embodiments, the tobacco modified atmosphere system further includes: The detection device is configured to detect the oxygen concentration and / or nitrogen concentration values ​​within the two storage chambers 10; and The control device, which is signal-connected to the detection device, the first gas transmission unit, and the second gas transmission unit, is configured to adjust the nitrogen delivery volume of the first gas transmission unit and / or adjust the air delivery volume of the second gas transmission unit according to the detection result of the detection device.

[0039] The detection device may include multiple oxygen detectors (e.g., a DCQT-300 composite detector) and / or multiple pressure sensors. These multiple oxygen detectors and / or multiple pressure sensors can be distributed within the storage chamber 10 to detect oxygen concentration and pressure values ​​at multiple locations, which helps improve the accuracy of the detection results.

[0040] The control device can stop supplying nitrogen to the storage chamber 10 when the detection device detects that the oxygen concentration in the storage chamber 10 is lower than a preset concentration value. The control device can also adjust the air supply of the second gas transmission unit based on the nitrogen concentration detected by the detection device, thereby helping to maintain the gas pressure balance within the storage chamber 10.

[0041] The control device may be implemented as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described in this disclosure.

[0042] The detection device can monitor the oxygen concentration in storage 10 in real time and adjust the nitrogen and air supply through the control device. This helps to accurately control the oxygen and nitrogen concentrations in storage 10, thereby avoiding excessive nitrogen supply or pressure imbalance and ensuring the stability of the controlled atmosphere operation between the two storage 10s.

[0043] In some embodiments, the nitrogen delivery rate and the air delivery rate are equal.

[0044] This setup can maintain pressure balance between the two storage chambers within 10 during the controlled atmosphere process, thereby preventing gas backflow or leakage caused by pressure difference, which helps to further reduce energy consumption and improve the stability and accuracy of controlled atmosphere operations.

[0045] like Figure 4 As shown, in some embodiments, the first gas transmission unit includes a nitrogen generator 3, the inlet of which is connected to at least one storage tank 10.

[0046] For example, nitrogen generator 3 can be an SG-30 nitrogen generator with a gas production capacity of 30 m³ / h and a purity > 99.5%. Nitrogen generator 3 can use the gas drawn from storage chamber 10 as a gas source to input into the separation layer. When the air passes through the separation layer, oxygen and nitrogen are screened and separated. After desorption and activation, the nitrogen forms high-concentration nitrogen gas, which then enters storage chamber 10, while the oxygen is directly discharged outside storage chamber 10.

[0047] For example, the air inlet of the nitrogen generator 3 can be connected to the outside of the storage chamber 10 or to the inside of the storage chamber 10. That is, when the air inlet of the nitrogen generator 3 is connected to the outside of the storage chamber 10, it can obtain gas from the outside. When the air inlet of the nitrogen generator 3 is connected to the inside of the storage chamber 10, it can obtain gas directly from the inside of the storage chamber 10.

[0048] For example, such as Figure 4As shown, the first gas transmission unit may include a main exhaust pipe 31, two exhaust branch pipes 34, a main return pipe 32, two return branch pipes 35, and two control valves 33. One control valve 33 is connected between the main exhaust pipe 31 and the two exhaust branch pipes 34, and the other control valve 33 is connected between the main return pipe 32 and the two return branch pipes 35. When both control valves 33 are open, the nitrogen generator 3 draws gas from the storage chamber 10 through the main return pipe 32 and the two return branch pipes 35 to produce nitrogen, and fills the storage chamber 10 through the main exhaust pipe 31 and the two exhaust branch pipes 34.

[0049] The gas in storage 10 can be drawn back to nitrogen generator 3 for purification to replenish storage 10 with high-concentration nitrogen. This setup can quickly reduce the oxygen concentration in storage 10 and directly recycle the gas in storage 10, thereby reducing gas emissions, realizing the recycling of gas resources, and reducing energy consumption in the nitrogen production process.

[0050] In some embodiments, the storage compartment 10 has at least two airbags 20 built in; wherein... The second gas transmission unit is connected in series and / or in parallel with at least two airbags 20 in the same storage compartment 10.

[0051] For example, such as Figure 3 As shown, the second gas transmission unit includes a second fan 4, and the exhaust port of the second fan 4 can be connected to two airbags 20 in the same storage chamber 10 to simultaneously inflate the two airbags 20 in the same storage chamber 10.

[0052] For example, the airbags 20 in the same storage chamber 10 are connected in sequence (not shown), and the exhaust port of the second fan 4 can be connected to one of the airbags 20 in the same storage chamber 10 to inflate the airbags 20 in the same storage chamber 10 one by one.

[0053] The second gas transmission unit is connected in parallel with the airbags 20 in the same storage chamber 10, which facilitates the simultaneous inflation of multiple airbags 20, thereby improving the efficiency of controlled atmosphere operation. The second gas transmission unit is connected in series with the airbags 20 in the same storage chamber 10, so that air flows sequentially between the airbags 20 in the same storage chamber 10, forming a continuous airflow path, which helps to create a pressure buffer.

[0054] like Figure 3 As shown, the storage compartment 10 has at least two airbags 20 inside; wherein, At least two airbags 20 within the same storage compartment 10 are configured to cover at least two surfaces of the smokestack 100 when inflated.

[0055] For example, further such as Figure 3As shown, the door 204 of the storage silo 10 is located at the front of the storage silo 10, and the smoke stack 100 is stacked near the rear of the storage silo 10. The storage silo 10 has two airbags 20 inside, one airbag 20 is located above the smoke stack 100, and the other airbag 20 is located between the smoke stack 100 and the door 204. When the two airbags 20 are inflated, the airbags 20 can cover the upper and front sides of the smoke stack 100.

[0056] For example, the storage compartment 10 may also contain three or more airbags 20 (not shown) to cover the left and right sides of the smoke stack 100 when the airbags 20 are inflated.

[0057] By setting at least two airbags 20 inside the storage chamber 10 and ensuring that they can cover at least two surfaces of the smoke stack 100 when inflated, the smoke stack 100 can be clamped and wrapped in multiple ways. This is beneficial for fully emptying the gas inside the storage chamber 10 and rapidly reducing the oxygen content.

[0058] In some embodiments, the total volume of the airbags 20 in the storage compartment 10 when inflated accounts for at least 1 / 3 of the volume of the storage compartment 10.

[0059] For example, such as Figure 3 As shown, the total volume of the airbags 20 in the inflated state in the storage chamber 10 is 1 / 2 of the volume of the storage chamber 10.

[0060] In practical applications, since space must be reserved around the smoke stack 100 for the passage and operation of tools, the total volume of the airbags 20 in the storage bin 10 when inflated occupies at least 1 / 3 of the volume of the storage bin 10, so that the remaining space can be occupied. This is conducive to improving the exhaust effect in the storage bin 10 and fully reducing the oxygen content.

[0061] like Figure 5 As shown, in some embodiments, the door 204 of the storage silo 10 is located at the front of the storage silo 10. The tobacco modified atmosphere system also includes a sealing part, which includes a sealing strip and a sealing film 220. The sealing strip is connected to the sealing film 220, and the sealing strip is disposed along the outer periphery of the door 204, with a portion disposed on the front wall 202 of the storage silo 10 and another portion disposed on the ground 201 inside the storage silo 10, so that the sealing film 220 seals the door 204. The front wall 202 and the ground 201 of the storage silo 10 are provided with mating portions 205 that seal with the sealing strip. The sealing part helps to prevent air leakage in the storage silo 10 during modified atmosphere operation, thereby improving the accuracy and stability of the modified atmosphere operation.

[0062] like Figures 6 to 8As shown, the sealing strip includes a first sealing section 211, a second sealing section 212, and a third sealing section 213. Each of the first sealing section 211, second sealing section 212, and third sealing section 213 includes a sealing groove 210. The first sealing section 211 is a straight sealing section. The second sealing section 212 is an arc-shaped sealing section, connecting two right-angled first sealing sections 211 extending in the same plane. The third sealing section 213 is a right-angled sealing section, connecting the first sealing section 211 extending along the height direction of the storage hopper 10 and the first sealing section 211 extending horizontally.

[0063] like Figure 9 As shown, in some embodiments, two pipe sections of the main return air pipe 32, located inside and outside the storage chamber 10, are connected by two connectors 36. The two connectors 36 are located on both sides of the sealing membrane 220 along the thickness direction, which helps to prevent air leakage from the storage chamber 10. A three-way valve 37 is provided on the main return air pipe 32, which connects the two storage chambers 10 and the first fan 5 and / or the second fan 4.

[0064] like Figure 9 As shown, in some embodiments, the control device is signal-connected to control valve 33 and three-way valve 37 to control the flow rate of gas through control valve 33 and three-way valve 37.

[0065] Another aspect of this disclosure provides an air circulation method based on a tobacco modified atmosphere system, the air circulation method comprising: S1. Obtain a gas source and produce nitrogen; S2. Introduce nitrogen into one of the storage chambers 10; S3. Before the oxygen concentration in the nitrogen-introduced storage chamber 10 drops to the preset concentration value, air is introduced into the airbag 20 in another storage chamber 10 until the airbag 20 is inflated. S4. Transfer nitrogen between the two storage chambers 10 and transfer air between the air bladders 20 of the two storage chambers 10.

[0066] The preset concentration value can be 2%.

[0067] The gas recirculation method disclosed herein is based on the tobacco controlled atmosphere system of the above embodiments. By transferring nitrogen between the two storage chambers 10 and air between the air bladders 20 of the two storage chambers 10, gas recycling is achieved, avoiding direct emission of gas used during the controlled atmosphere process and reducing gas resource waste during the controlled atmosphere operation. Furthermore, the alternating nitrogen filling and oxygen depletion of the two storage chambers 10, along with the air depletion through the inflated state of the air bladders 20, accelerates the oxygen reduction rate within the storage chambers 10, shortens the oxygen depletion time, and improves the efficiency of the controlled atmosphere operation.

[0068] like Figure 1As shown, in some embodiments, the first gas transmission unit includes a nitrogen generator 3 and a first fan 5. The air inlet of the nitrogen generator 3 is connected to the outside of the two storage chambers 10 or to one of the storage chambers 10. The first fan 5 is connected between the two storage chambers 10. The second gas transmission unit includes a second fan 4, which is connected between the air bladders 20 of the two storage chambers 10. S1 also includes: S11, The air inlet of the nitrogen generator 3 is connected to the outside of the two storage chambers 10; and / or S4 also includes: S41. Turn off nitrogen generator 3 and turn on first fan 5 to transfer nitrogen from the two storage chambers 10; and S42. Turn on the second fan 4 to transfer the air from the airbags 20 of the two storage chambers 10.

[0069] S41 and S42 can be performed simultaneously.

[0070] Using the first fan 5 and the second fan 4 for gas transfer can improve the nitrogen filling and oxygen depletion speed and form a closed-loop cycle, reducing the load on the nitrogen generator 3 and saving energy. In addition, during the gas transfer process, the gas bladder 20 of one of the storage chambers 10 gradually expands, and the nitrogen in the storage chamber 10 is transferred to the other storage chamber 10, while the gas bladder 20 in the other storage chamber 10 gradually contracts. This helps to dynamically balance the gas pressure and compensate for spatial changes, avoiding the risk of pressure imbalance.

[0071] like Figure 2 As shown, in some embodiments, S1 further includes: S12, The air inlet of the nitrogen generator 3 is connected to the outside of the two storage chambers 10; and / or S4 also includes: S43, the air inlet of the nitrogen generator 3 is connected to the storage chamber 10 when the air bag 20 is in the deflating state, and the exhaust port of the nitrogen generator 3 is connected to the storage chamber 10 when the air bag is in the inflating state; and S44. Turn on the second fan 4 to transfer the air from the airbags 20 of the two storage chambers 10.

[0072] This gas circulation method connects the air inlet of the nitrogen generator 3 with the storage chamber 10 in the air bag 20 in the evacuation state. That is, it does not simply transfer the nitrogen in one storage chamber 10 to another storage chamber 10, but further purifies the nitrogen through the nitrogen generator 3 in the middle, which helps to improve the speed of nitrogen filling and oxygen reduction.

[0073] In some embodiments, the air circulation method further includes: S5. After S4, turn on the nitrogen generator 3 and control both the air inlet and exhaust outlet of the nitrogen generator 3 to be connected to the storage chamber 10 in the air bag 20 in the air extraction state.

[0074] First, the air inlet of the nitrogen generator 3 is connected to the storage chamber 10 where the air bag 20 is in the evacuation state. Then, the connection between the air inlet of the nitrogen generator 3 and the storage chamber 10 where the air bag 20 is in the inflation state is disconnected. Finally, both the air inlet and the exhaust port of the nitrogen generator 3 are connected to the storage chamber 10 where the air bag 20 is in the evacuation state.

[0075] This gas circulation method involves circulating nitrogen gas through the same storage chamber 10 to improve the nitrogen filling and oxygen reduction effect.

[0076] The following combination Figure 1 and Figure 2 The air circulation method of the present disclosure will be described in detail.

[0077] Example 1: like Figure 1 In the illustrated embodiment, the first gas transfer unit includes a nitrogen generator 3 and a first fan 5. The nitrogen generator 3 is connected to the outside of two storage chambers 10, and is turned on to produce nitrogen. Nitrogen is introduced into one of the storage chambers 10, and air is introduced into the air bladder 20 of the other storage chamber 10. After the oxygen concentration in the nitrogen-introduced storage chamber 10 decreases to 2%, the nitrogen generator 3 is turned off. Simultaneously, the first fan 5 and the second fan 4 are turned on to synchronously transfer the nitrogen in the storage chamber 10 and the air in the air bladder 20. During this process, a detection device monitors the gas pressure in the storage chamber 10, and the control device adjusts the opening of the control valve 33 according to the gas pressure to maintain pressure balance. After the air in the evacuated air bladder 20 is emptied, the nitrogen generator 3's inlet and outlet are connected to the storage chamber 10 containing the evacuated air bladder 20, and the nitrogen generator 3 is turned on to circulate nitrogen and reduce oxygen levels.

[0078] Example 2: like Figure 2 In the illustrated embodiment, with Figure 1 The difference in the illustrated embodiment is that the first gas transmission unit only includes a nitrogen generator 3. After the oxygen concentration in the nitrogen-introduced storage chamber 10 decreases to 2%, the inlet of the nitrogen generator 3 is switched from being connected to the outside of the storage chamber 10 to being connected to the storage chamber 10 containing the airbag 20 which is in a vacuum state, and nitrogen is supplied to another storage chamber 10. At the same time, the second fan 4 is turned on to transfer the air inside the airbag 20. Moreover, the control device first controls the exhaust port of the nitrogen generator 3 to be connected to the storage chamber 10 containing the airbag 20 which is in an inflated state, and then controls the exhaust port of the nitrogen generator 3 to be disconnected from the storage chamber 10 containing the airbag 20 which is in a vacuum state.

[0079] Performance tests were conducted on the gas circulation methods of Examples 1 and 2 described above, as well as on a comparative example of controlled atmosphere operation performed on a single storage silo 10. The test results are shown in Table 1 below: Table 1 Performance test results of the examples and comparative examples

[0080] As can be seen from Table 1, the gas circulation methods of Embodiments 1 and 2 of this disclosure can effectively reduce the nitrogen filling and oxygen reduction time and reduce energy consumption.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and not to limit them; although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this disclosure or equivalent substitutions can be made to some technical features, all of which should be covered within the scope of the technical solutions claimed in this disclosure.

Claims

1. A tobacco modified atmosphere system, characterized in that, include: Two storage bins (10) are used to store tobacco stacks (100). At least two airbags (20) are placed in the two storage compartments (10), and the airbags (20) have an inflated state and a deflated state; A first gas transfer unit, connected to both of the storage chambers (10), is configured to provide nitrogen and / or transfer nitrogen between the two storage chambers (10); and A second gas transfer unit, in communication with at least two of the airbags (20), is configured to transfer air between the airbags (20) located in the two reservoirs (10).

2. The tobacco modified atmosphere system according to claim 1, characterized in that, Also includes: A detection device configured to detect oxygen concentration values ​​and / or nitrogen concentration values ​​in the two storage chambers (10); and A control device, signal-connected to the detection device, the first gas transmission unit, and the second gas transmission unit, is configured to adjust the nitrogen delivery volume of the first gas transmission unit and / or adjust the air delivery volume of the second gas transmission unit based on the detection result of the detection device.

3. The tobacco modified atmosphere system according to claim 2, characterized in that, The nitrogen delivery rate is equal to the air delivery rate.

4. The tobacco modified atmosphere system according to any one of claims 1-3, characterized in that, The first gas transmission unit includes a nitrogen generator (3), the inlet of which is connected to at least one of the storage tanks (10).

5. The tobacco modified atmosphere system according to any one of claims 1-3, characterized in that, The storage compartment (10) contains at least two of the airbags (20); wherein, The second gas transmission unit is connected in series and / or in parallel with at least two of the gas bags (20) in the same storage chamber (10).

6. The tobacco modified atmosphere system according to any one of claims 1-3, characterized in that, The storage compartment (10) contains at least two of the airbags (20); wherein, At least two of the airbags (20) within the same storage compartment (10) are configured to cover at least two surfaces of the smokestack (100) in the inflated state.

7. The tobacco modified atmosphere system according to any one of claims 1-3, characterized in that, The total volume of the airbags (20) in the storage compartment (10) in the inflated state accounts for at least 1 / 3 of the volume of the storage compartment (10).

8. A method for air circulation based on the tobacco modified atmosphere system according to any one of claims 1-7, characterized in that, include: S1. Obtain a gas source and produce the nitrogen gas; S2. Introduce the nitrogen gas into one of the storage hoppers (10); S3. Before the oxygen concentration in the storage chamber (10) into which the nitrogen gas is introduced decreases to a preset concentration value, air is introduced into the airbag (20) in another storage chamber (10) until the airbag (20) is in the inflated state. S4. Transfer the nitrogen between the two storage chambers (10) and transfer the air between the air bladders (20) of the two storage chambers (10).

9. The gas circulation method according to claim 8, characterized in that, The first gas transmission unit includes a nitrogen generator (3) and a first fan (5). The air inlet of the nitrogen generator (3) is connected to the outside of the two storage chambers (10) or to one of the storage chambers (10). The first fan (5) is connected between the two storage chambers (10). The second gas transmission unit includes a second fan (4). The second fan (4) is connected between the air bladders (20) of the two storage chambers (10). S1 further includes: S11, Control the air inlet of the nitrogen generator (3) to be connected to the outside of the two storage hoppers (10); and / or S4 further includes: S41. Turn off the nitrogen generator (3) and turn on the first fan (5) to transfer the nitrogen gas in the two storage chambers (10); and S42. Turn on the second fan (4) to transfer the air in the airbags (20) of the two storage chambers (10).

10. The gas circulation method according to claim 8, characterized in that, The first gas transmission unit includes a nitrogen generator (3), the air inlet of which is connected to the outside of the two storage chambers (10) or to one of the storage chambers (10). The second gas transmission unit includes a second fan (4), which is connected between the air bladders (20) of the two storage chambers (10). S1 further includes: S12, Control the air inlet of the nitrogen generator (3) to be connected to the outside of the two storage hoppers (10); and / or S4 further includes: S43. Control the air inlet of the nitrogen generator (3) to connect with the storage chamber (10) of the air bag (20) in the air-draining state, and control the exhaust port of the nitrogen generator (3) to connect with the storage chamber (10) of the air bag (20) in the inflating state; and S44. Turn on the second fan (4) to transfer the air in the airbags (20) of the two storage chambers (10).

11. The gas recirculation method according to any one of claims 8-10, characterized in that, Also includes: S5. After S4, the nitrogen generator (3) is turned on and the air inlet and exhaust outlet of the nitrogen generator (3) are connected to the storage chamber (10) in the air-suction state of the air bag (20).

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