Rapid oxygen reduction and insect killing method for tobacco storage and control system

Abstract

The invention discloses a rapid oxygen reduction and insect killing method for tobacco storage and a control system. The method comprises the steps that a first air inlet valve is closed, a first exhaust valve is opened, air exhaust equipment is opened, and air exhaust is conducted on all airtight tents in the ith group at the same time; when the air pressure value is reduced to a preset negative pressure threshold value, the air extraction equipment is closed, and nitrogen filling and oxygen reduction are conducted on all the airtight tents in the ith group at the same time through the nitrogen generation equipment; when the air pressure value reaches a preset normal pressure threshold value or a preset positive pressure threshold value, a first exhaust valve is opened, and air exhaust is carried out while nitrogen charging and oxygen reduction are carried out; when the oxygen content reaches a first-stage target value, the first air inlet valve and the first exhaust valve are closed, and the first-stage target value is updated to a second-stage target value after standing for a preset duration; on the basis of the second-stage target value, the steps are repeatedly executed; and after the oxygen content reaches a first preset range, carbon dioxide is filled into each airtight tent in the ith group or dry ice is put into each airtight tent in the ith group. According to the method, the nitrogen charging and oxygen reducing efficiency and the insect killing efficiency of tobacco storage can be improved.

Description

Technical Field

[0001] This application relates to the field of tobacco storage technology, and in particular to a rapid deoxygenation and insecticidal method and control system for tobacco storage. Background Technology

[0002] Tobacco typically needs to be stored in tobacco warehouses for more than two years for natural aging before it can be used in production. For large tobacco stacks, the weight of tobacco in each stack can range from several tons to tens of tons. During the storage process, the storage environment is constantly changing, and problems such as insect infestation and mold growth often occur.

[0003] Therefore, tobacco stacks need to be treated for pest control, and the three factors affecting pest control are oxygen content, temperature, and humidity. Among these, oxygen content plays a decisive role. In low-oxygen environments, nitrogen can be injected into the airtight tents containing the tobacco stacks to replace oxygen, thus achieving pest control. However, the currently used nitrogen-filling oxygen-reducing process is inefficient, requiring a considerable amount of time for the oxygen content inside the airtight tents to reach the desired pest control standard. Furthermore, tobacco warehouses typically contain a large number of airtight tents used to protect the tobacco stacks, each requiring nitrogen filling for oxygen reduction, further increasing the burden and time required for nitrogen filling and oxygen reduction, resulting in higher costs. Summary of the Invention

[0004] In view of this, embodiments of this application provide a rapid oxygen-reducing and insecticidal method and control system for tobacco storage, which is used to solve at least one of the above-mentioned technical problems.

[0005] This application provides a rapid oxygen-reducing and insecticidal method for tobacco storage. The method is based on a tobacco warehouse, a nitrogen generator, and an exhaust system. Multiple tobacco stacks are located within multiple airtight tents in the tobacco warehouse. The nitrogen generator is connected to each of the airtight tents via an intake pipe equipped with an intake valve. The exhaust system is connected to each of the airtight tents via an exhaust pipe equipped with an exhaust valve. The airtight tents are divided into multiple groups, each group comprising at least two airtight tents. The rapid oxygen-reducing and insecticidal method for tobacco storage includes:

[0006] Close the first air intake valve corresponding to the i-th group in multiple groups, open the first exhaust valve corresponding to the i-th group, and turn on the air extraction equipment to simultaneously extract air from each airtight tent in the i-th group; when the air pressure value in each airtight tent in the i-th group drops to the preset negative pressure threshold, turn off the air extraction equipment, open the first air intake valve, and use the nitrogen generator to simultaneously fill each airtight tent in the i-th group with nitrogen to reduce oxygen.

[0007] When the air pressure value in each airtight tent in the i-th group reaches the first preset normal pressure or positive pressure threshold, the first exhaust valve is opened. While using the nitrogen generator to fill each airtight tent in the i-th group with nitrogen and reduce oxygen, the air extraction device is used to extract air from each airtight tent in the i-th group.

[0008] When the oxygen content in each airtight tent in the i-th group reaches the preset first-stage target value, the first air intake valve and the first air exhaust valve are closed. After each airtight tent in the i-th group is left to stand for a preset time, the first-stage target value is updated. The updated second-stage target value is less than the first-stage target value.

[0009] Based on the target value of the second stage, repeat the above steps to continuously reduce the oxygen content in each airtight tent in the i-th group;

[0010] After the oxygen content in each airtight tent in the i-th group reaches the first preset range, carbon dioxide is injected into each airtight tent in the i-th group or dry ice is introduced, so that the carbon dioxide content in each airtight tent in the i-th group reaches the second preset range.

[0011] According to some embodiments of this application, optionally, the rapid oxygen reduction and insecticidal method for tobacco storage further includes: during the settling process, closing the second air inlet valve corresponding to the j-th group in a plurality of groups, opening the second exhaust valve corresponding to the j-th group, and simultaneously evacuating each airtight tent in the j-th group using an air extraction device, where j ≠ i and j is a positive integer; when the air pressure value in each airtight tent in the j-th group drops to a preset negative pressure threshold, closing the air extraction device, opening the second air inlet valve, and simultaneously evacuating each airtight tent in the j-th group using a nitrogen generator. The airtight tents are filled with nitrogen to reduce oxygen. When the air pressure in each airtight tent in the j-th group reaches the first preset normal pressure or positive pressure threshold, the second exhaust valve is opened. While using the nitrogen generator to fill the airtight tents in the j-th group with nitrogen to reduce oxygen, the exhaust device is used to simultaneously evacuate the air from the airtight tents in the j-th group. When the oxygen content in each airtight tent in the j-th group reaches the preset first-stage target value, the second intake valve and the second exhaust valve are closed, and the airtight tents in the j-th group are left to stand for a preset time.

[0012] According to some embodiments of this application, optionally, when using a nitrogen generator and an air extraction device to simultaneously fill each airtight tent in the i-th group with nitrogen to reduce oxygen and extract air, the air extraction volume of the air extraction device is less than or equal to the air intake volume of the nitrogen generator.

[0013] According to some embodiments of this application, optionally, the distances between the multiple airtight tents in the i-th group and the nitrogen generator are different. When the nitrogen generator is used to simultaneously fill each airtight tent in the i-th group with nitrogen and reduce oxygen, the opening degree of the exhaust valve connected to the multiple airtight tents in the i-th group is positively correlated with the distance.

[0014] According to some embodiments of this application, optionally, a nitrogen generator is used to simultaneously purge each airtight tent in the i-th group with nitrogen and reduce oxygen, including: detecting the oxygen content of multiple airtight tents in the i-th group; adjusting the purity of the nitrogen output from the nitrogen generator based on the maximum or average oxygen content of the multiple airtight tents in the i-th group, with the purity adjusted within the range of 98% to 99.99%; and simultaneously purifying each airtight tent in the i-th group with nitrogen and reducing oxygen based on the nitrogen output from the nitrogen generator with adjusted purity.

[0015] According to some embodiments of this application, optionally, the purity of the nitrogen output from the nitrogen generator is adjusted based on the maximum or average oxygen content among the plurality of airtight tents in the i-th group, including: adjusting the purity of the nitrogen output from the nitrogen generator to ≥98% when the maximum or average value is ≥5%; adjusting the purity of the nitrogen output from the nitrogen generator to ≥98.5% when the maximum or average value is between 2% and 5%; adjusting the purity of the nitrogen output from the nitrogen generator to ≥99.5% when the maximum or average value is between 2% and 1%; and adjusting the purity of the nitrogen output from the nitrogen generator to ≥99.9% when the maximum or average value is between 0.5% and 1%.

[0016] According to some embodiments of this application, optionally, the first preset content range includes 0% to 0.5%, and the second preset content range includes 2% to 10%.

[0017] According to some embodiments of this application, optionally, the preset duration is positively correlated with the number of tobacco boxes stacked in the tobacco pile.

[0018] This application provides a rapid oxygen reduction and insecticidal control system for tobacco storage. The system is based on a tobacco warehouse, a nitrogen generator, an exhaust system, and a carbon dioxide source. Multiple tobacco stacks are located within multiple airtight tents in the tobacco warehouse. The nitrogen generator is connected to each of the airtight tents via an intake pipe equipped with an intake valve. The exhaust system is connected to each of the airtight tents via an exhaust pipe equipped with an exhaust valve. The airtight tents are divided into multiple groups, each group comprising at least two airtight tents. The rapid oxygen reduction and insecticidal control system for tobacco storage includes a main control module and a valve control component.

[0019] The valve control component is used to close the first air intake valve corresponding to the i-th group in multiple groups and open the first exhaust valve corresponding to the i-th group. The main control module is used to control the air extraction equipment to simultaneously extract air from each airtight tent in the i-th group, where i is a positive integer.

[0020] The valve control component is also used to open the first air intake valve when the air pressure value in each airtight tent in the i-th group drops to a preset negative pressure threshold. The main control module is also used to shut down the air extraction equipment and control the nitrogen generator to simultaneously fill each airtight tent in the i-th group with nitrogen and reduce oxygen.

[0021] The valve control component is also used to open the first exhaust valve when the air pressure value in each airtight tent in the i-th group reaches the first preset normal pressure or positive pressure threshold. The main control module is also used to control the air extraction device to simultaneously extract air from each airtight tent in the i-th group while controlling the nitrogen generator to fill the air with nitrogen and reduce oxygen in each airtight tent in the i-th group.

[0022] The valve control component is also used to close the first intake valve and the first exhaust valve when the oxygen content in each airtight tent in the i-th group reaches the preset first-stage target value, and to allow the gas in each airtight tent in the i-th group to stand still for a preset time.

[0023] The main control module is also used to update the first-stage target value to obtain the updated second-stage target value, so that the control system repeats the above steps based on the second-stage target value until the oxygen content in each airtight tent in the i-th group reaches the first preset content range, wherein the second-stage target value is less than the first-stage target value.

[0024] The main control module is also used to control the carbon dioxide gas source to fill each airtight tent in the i-th group with carbon dioxide or to add dry ice until the carbon dioxide content in each airtight tent in the i-th group reaches the second preset content range.

[0025] According to some embodiments of this application, the nitrogen generator may optionally include a skid-mounted low-oxygen gas workstation.

[0026] The rapid oxygen reduction and insecticidal method and control system for tobacco storage provided in the embodiments of this application, on the one hand, when the air pressure value in each airtight tent in the i-th group reaches a first preset atmospheric pressure or positive pressure threshold, the first exhaust valve is opened. While simultaneously using a nitrogen generator to purge nitrogen and reduce oxygen in each airtight tent in the i-th group, an exhaust device simultaneously evacuates air from each airtight tent in the i-th group. This simultaneous nitrogen purge and exhaust allows the gas in each airtight tent in the i-th group to circulate, achieving rapid gas replacement and quickly reducing the oxygen content in each airtight tent, thus improving the efficiency of nitrogen purge and oxygen reduction. On the other hand, by adopting a stepped intermittent nitrogen purge and oxygen reduction mode, multiple groups of airtight tents are purged and replaced with nitrogen in turn, which can rapidly and in batches reduce the oxygen content in each group of airtight tents, further improving the rate and efficiency of nitrogen purge and oxygen reduction. On the other hand, under low-oxygen conditions, by filling the airtight tent with an appropriate amount of carbon dioxide, the respiration of pests can be stimulated, the rate of dehydration and suffocation of pests can be accelerated, and the efficiency of pest control can be improved. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments of this application will be briefly described below.

[0028] Figure 1 This is a schematic diagram of an application architecture for a rapid deoxygenation and insecticidal method for tobacco storage, according to an embodiment of this application.

[0029] Figure 2 This is a schematic flowchart of a rapid deoxygenation and insecticidal method for tobacco storage, according to an embodiment of this application.

[0030] Figure 3 This is a schematic diagram of a rapid deoxygenation and insecticidal control system for tobacco storage provided in an embodiment of this application. Detailed Implementation

[0031] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0033] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0034] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in this application can be combined with each other without contradiction.

[0035] Before describing the technical solutions provided in the embodiments of this application, in order to facilitate understanding of the embodiments of this application, this application first specifically explains the problems existing in the related technologies:

[0036] Tobacco typically needs to be stored in tobacco warehouses for more than two years for natural aging before it can be used in production. For large tobacco stacks, the weight of tobacco in each stack can range from several tons to tens of tons. During the storage process, the storage environment is constantly changing, and problems such as insect infestation and mold growth often occur.

[0037] Therefore, tobacco stacks need to be treated for pest control, and the three factors affecting pest control are oxygen content, temperature, and humidity. Among these, oxygen content plays a decisive role. In low-oxygen environments, nitrogen can be injected into the airtight tents containing the tobacco stacks to replace oxygen, thus achieving pest control. However, the currently used nitrogen-filling oxygen-reducing process is inefficient, requiring a considerable amount of time for the oxygen content inside the airtight tents to reach the desired pest control standard. Furthermore, tobacco warehouses typically contain a large number of airtight tents used to protect the tobacco stacks, each requiring nitrogen filling for oxygen reduction, further increasing the burden and time required for nitrogen filling and oxygen reduction, resulting in higher costs.

[0038] In view of the inventors’ above-mentioned research findings, the embodiments of this application provide a rapid deoxygenation and insecticidal method for tobacco storage and a rapid deoxygenation and insecticidal control system for tobacco storage, which can solve at least one of the above-mentioned technical problems existing in the related art.

[0039] The rapid oxygen-reducing and insecticidal method for tobacco storage provided in the embodiments of this application will be introduced first.

[0040] Rapid deoxygenation and insecticidal methods for tobacco storage can be based on tobacco warehouses, nitrogen generation equipment, and exhaust equipment. Figure 1 This is a schematic diagram illustrating an application architecture of a rapid oxygen-reducing and insecticidal method for tobacco storage, as described in an embodiment of this application. Figure 1 As shown, multiple tobacco stacks can be located within multiple different airtight tents 100 in the tobacco warehouse 10. Each airtight tent 100 can hold at least one tobacco stack. A nitrogen generator 11 can be connected to the multiple airtight tents 100 via an inlet pipe G1. The inlet pipe G1 is equipped with multiple inlet valves 121, each corresponding to one airtight tent 100. For example, each inlet valve 121 can be positioned between the inlet pipe G1 and each airtight tent 100. An exhaust device 13 can be connected to the multiple airtight tents 100 via an exhaust pipe G2. The exhaust pipe G2 can be equipped with multiple exhaust valves 122, each corresponding to one airtight tent 100. For example, each exhaust valve 122 can be positioned between the exhaust pipe G2 and each airtight tent 100. The multiple airtight tents 100 can be divided into multiple groups, each group including at least two airtight tents 100.

[0041] Figure 2 This is a schematic flowchart of a rapid oxygen-reducing and insecticidal method for tobacco storage, according to an embodiment of this application. Figure 2 As shown, the rapid oxygen-reducing and insecticidal method for tobacco storage provided in this application embodiment may include the following steps S201 to S206.

[0042] S201: Close the first air intake valve corresponding to the i-th group among multiple groups, open the first exhaust valve corresponding to the i-th group, and turn on the air extraction device to extract air from each airtight tent in the i-th group.

[0043] Here, the i-th group can be any one of multiple groups, where i is a positive integer. For ease of explanation, the intake valve corresponding to the i-th group is called the first intake valve, and the exhaust valve corresponding to the i-th group is called the first exhaust valve. The first intake valve may include intake valves disposed between the exhaust pipe and each airtight tent in the i-th group, and the first exhaust valve may include exhaust valves disposed between the exhaust pipe and each airtight tent in the i-th group.

[0044] In step S201, the first air intake valve corresponding to the i-th group can be closed, the first exhaust valve corresponding to the i-th group can be opened, and the vacuuming device can be activated to simultaneously evacuate air from each airtight tent in the i-th group, reducing the air pressure inside each airtight tent in the i-th group to negative pressure. Furthermore, it should be noted that while evacuating air from each airtight tent in the i-th group, the air intake and exhaust valves corresponding to other groups are closed. For example, the vacuuming device includes, but is not limited to, an air pump.

[0045] S202: When the air pressure in each airtight tent in the i-th group drops to the preset negative pressure threshold, turn off the air extraction equipment, open the first air intake valve, and use the nitrogen generator to simultaneously fill each airtight tent in the i-th group with nitrogen to reduce oxygen.

[0046] In step S202, when the air pressure inside each airtight tent in the i-th group drops to a preset negative pressure threshold, the extraction equipment can be shut off, the first intake valve corresponding to the i-th group can be opened, and the nitrogen generator can be turned on to simultaneously fill the airtight tents in the i-th group with nitrogen and reduce oxygen. The preset negative pressure threshold can be flexibly adjusted according to the actual situation, and this application does not limit it. Furthermore, it should be noted that when filling the airtight tents in the i-th group with nitrogen and reducing oxygen, the intake and exhaust valves of other groups are closed.

[0047] S203: When the air pressure value in each airtight tent in the i-th group reaches the first preset normal pressure or positive pressure threshold, the first exhaust valve is opened. While using the nitrogen generator to simultaneously fill the airtight tents in the i-th group with nitrogen and reduce oxygen, the air extraction device simultaneously extracts air from each airtight tent in the i-th group.

[0048] The nitrogen generator simultaneously fills each airtight tent in the i-th group with nitrogen to reduce oxygen, bringing the air pressure inside each tent to normal or positive pressure, such as filling them to a non-contraction state. When the air pressure inside each tent in the i-th group reaches a first preset normal or positive pressure threshold, the first exhaust valve corresponding to the i-th group can be opened. While the nitrogen generator is simultaneously filling the tents with nitrogen to reduce oxygen, the exhaust device is simultaneously evacuating the tents, allowing the gas in each tent to circulate and rapidly replace the gas, thus quickly reducing the oxygen content. The first preset normal or positive pressure threshold is greater than a preset negative pressure threshold. The magnitude of the first preset normal or positive pressure threshold can be flexibly adjusted according to actual conditions, and this application does not limit it. It should be noted that when nitrogen filling and oxygen depletion and air extraction are performed on each airtight tent in the i-th group, the corresponding air intake and exhaust valves of other groups are closed.

[0049] S204: When the oxygen content in each airtight tent in the i-th group reaches the preset first-stage target value, close the first air intake valve and the first air exhaust valve. After the airtight tents in the i-th group have been left to stand for a preset time, update the first-stage target value. The updated second-stage target value is less than the first-stage target value.

[0050] Specifically, when the oxygen content in each airtight tent in the i-th group reaches the preset first-stage target value, the first air intake valve and the first air exhaust valve corresponding to the i-th group can be closed. The nitrogen generator and extraction equipment can also be shut down, and each airtight tent in the i-th group can be left to stand for a preset time. This standing period helps to balance the oxygen content within the tobacco stack and the airtight tents, bringing them to a stable state. The preset time can be flexibly adjusted according to actual conditions, and this application does not limit it.

[0051] After each airtight tent in the i-th group has been left to stand for a preset time, the first-stage target value can be updated, that is, the first-stage target value can be changed to the second-stage target value. The updated second-stage target value can be smaller than the first-stage target value. The magnitude of the first-stage and second-stage target values ​​can be flexibly adjusted according to actual circumstances, and this application does not impose any limitations on this.

[0052] For example, in some examples, multiple target values ​​can be set within an oxygen content range of 21% to 0.5%, with each target value decreasing sequentially. After each target value is reached, the airtight tents in the i-th group are left to stand still for a preset time. The first target value can be one of the multiple target values, arranged in descending order, and the second target value can be the target value that follows the first target value.

[0053] S205: Based on the target value of the second stage, repeat the above steps to continuously reduce the oxygen content in each airtight tent in the i-th group.

[0054] Repeat steps S201 to S204 above to continuously reduce the oxygen content in each airtight tent in the i-th group.

[0055] S206: After the oxygen content in each airtight tent in the i-th group reaches the first preset range, carbon dioxide is injected into each airtight tent in the i-th group or dry ice is introduced, so that the carbon dioxide content in each airtight tent in the i-th group reaches the second preset range.

[0056] After the oxygen content in each airtight tent in the i-th group reaches the first preset range, carbon dioxide can be introduced into each airtight tent in the i-th group or dry ice can be added to make the carbon dioxide content in each airtight tent in the i-th group reach the second preset range. The size of the first preset range and the second preset range can be flexibly adjusted according to the actual situation, and this application does not limit them.

[0057] The inventors of this application have discovered that when the oxygen content inside an airtight tent is between 0% and 0.5%, and the carbon dioxide content is between 2% and 10%, a better insecticidal effect can be achieved, significantly shortening the insecticidal time. Therefore, in some embodiments, optionally, the first preset content range can be between 0% and 0.5%, and the second preset content range can be between 2% and 10%, thereby improving insecticidal efficiency and significantly shortening the insecticidal time.

[0058] The rapid oxygen reduction and insect control method for tobacco storage provided in the embodiments of this application, on the one hand, involves opening the first exhaust valve when the air pressure in each airtight tent in the i-th group reaches a first preset atmospheric pressure or positive pressure threshold. Simultaneously, nitrogen is generated to reduce oxygen in each airtight tent in the i-th group, while air is simultaneously extracted from each airtight tent in the i-th group using an extraction device. This simultaneous nitrogen generation and extraction allows for gas circulation within each airtight tent in the i-th group, achieving rapid gas replacement and quickly reducing the oxygen content, thus improving the efficiency of nitrogen reduction. On the other hand, employing a stepped intermittent nitrogen reduction mode, with multiple groups of airtight tents being alternately filled and deoxygenated, can rapidly and in batches reduce the oxygen content in each group of airtight tents, further improving the rate and efficiency of nitrogen reduction. On the other hand, under low-oxygen conditions, by filling the airtight tent with an appropriate amount of carbon dioxide, the respiration of pests can be stimulated, the rate of dehydration and suffocation of pests can be accelerated, and the efficiency of pest control can be improved.

[0059] According to some embodiments of this application, optionally, during the static setting process of each airtight tent in the i-th group, the airtight tents in other groups can be evacuated and filled with nitrogen to reduce oxygen, thereby improving the overall rate and efficiency of nitrogen filling and oxygen reduction, and shortening the overall time for nitrogen filling and oxygen reduction of multiple groups of airtight tents in the tobacco warehouse.

[0060] Specifically, in some specific embodiments, the rapid deoxygenation and insecticidal method for tobacco storage may also include the following steps one to four.

[0061] Step 1: During the static setting of each airtight tent in the i-th group, close the second air intake valve corresponding to the j-th group in multiple groups, open the second exhaust valve corresponding to the j-th group, and use the air extraction device to simultaneously extract air from each airtight tent in the j-th group, where j ≠ i and j is a positive integer.

[0062] The j-th group can be any group other than the i-th group, and this application does not limit this. For ease of explanation, the intake valve corresponding to the j-th group is referred to as the second intake valve, and the exhaust valve corresponding to the j-th group is referred to as the second exhaust valve. The second intake valve may include intake valves disposed between the exhaust pipe and each airtight tent in the j-th group, and the second exhaust valve may include exhaust valves disposed between the exhaust pipe and each airtight tent in the j-th group.

[0063] During the settling process of each airtight tent in the i-th group, the second air inlet valve corresponding to the j-th group can be closed, the second exhaust valve corresponding to the j-th group can be opened, and the vacuum equipment can be turned on to simultaneously evacuate air from each airtight tent in the j-th group, reducing the air pressure inside each airtight tent in the j-th group to negative pressure. While evacuating air from each airtight tent in the j-th group, the air inlet and exhaust valves corresponding to other groups are closed. The specific process of step one is similar to that of S201, and will not be repeated here.

[0064] Step 2: When the air pressure in each airtight tent in the j-th group drops to the preset negative pressure threshold, turn off the air extraction equipment, open the second air intake valve, and use the nitrogen generator to simultaneously fill each airtight tent in the j-th group with nitrogen to reduce oxygen.

[0065] Specifically, when the air pressure inside each airtight tent in the j-th group drops to a preset negative pressure threshold, the extraction equipment can be turned off, the second air intake valve corresponding to the j-th group can be opened, and the nitrogen generator can be turned on to simultaneously fill the airtight tents in the j-th group with nitrogen and reduce oxygen. While filling the airtight tents in the j-th group with nitrogen and reducing oxygen, the air intake and exhaust valves corresponding to other groups are closed. The specific process of step two is similar to that of S202, and will not be repeated here.

[0066] Step 3: When the air pressure value in each airtight tent in the j-th group reaches the first preset normal pressure or positive pressure threshold, open the second exhaust valve. At the same time, use the nitrogen generator to fill each airtight tent in the j-th group with nitrogen and reduce oxygen, and use the air extraction device to extract air from each airtight tent in the j-th group.

[0067] Specifically, the nitrogen generator simultaneously fills each airtight tent in the j-th group with nitrogen to reduce oxygen, bringing the air pressure inside each tent in the j-th group to a normal or positive pressure state, such as filling each tent in the j-th group to a state of no shrinkage. When the air pressure inside each tent in the j-th group reaches a first preset normal or positive pressure threshold, the second exhaust valve corresponding to the j-th group can be opened. While the nitrogen generator is simultaneously filling the airtight tents in the j-th group with nitrogen to reduce oxygen, the exhaust device is simultaneously evacuating the air from each tent in the j-th group. The specific process of step three is similar to that of S203 and will not be repeated here.

[0068] Step 4: When the oxygen content in each airtight tent in the j-th group reaches the preset first-stage target value, close the second air intake valve and the second air exhaust valve, and let each airtight tent in the j-th group remain still for a preset time.

[0069] Specifically, when the oxygen content in each airtight tent in the j-th group reaches the preset first-stage target value, the second air inlet valve and the second air outlet valve corresponding to the j-th group can be closed. The nitrogen generator and extraction equipment can also be shut down, and each airtight tent in the j-th group can be left to stand for a preset time. This standing period allows the oxygen content inside the tobacco stack and the airtight tents to be balanced and stabilized. The specific process of step four is similar to that of S204 and will not be repeated here.

[0070] Similar to the i-th group, the j-th group can also adopt a stepped intermittent nitrogen-filling and oxygen-reducing mode. This involves setting multiple target values ​​for each stage, with these values ​​decreasing sequentially. After each target value is reached, the airtight tents in the j-th group are left to stand for a preset time until the oxygen content in each tent reaches a first preset range. Once the oxygen content in the j-th tents reaches the first preset range, carbon dioxide is introduced into the tents or dry ice is added to bring the carbon dioxide content to a second preset range.

[0071] Thus, during the static setting process of each airtight tent in the i-th group, by evacuating and filling the airtight tents of the j-th group with nitrogen to reduce oxygen, the overall rate and efficiency of nitrogen filling and oxygen reduction can be improved, and the overall time for nitrogen filling and oxygen reduction of multiple groups of airtight tents in the tobacco warehouse can be shortened.

[0072] According to some embodiments of this application, optionally, in S203, when nitrogen generation equipment and air extraction equipment are used to simultaneously fill and de-oxygenate each airtight tent in the i-th group, the air extraction volume of the air extraction equipment can be less than or equal to the air intake volume of the nitrogen generation equipment. This makes the air extraction volume of each airtight tent in the i-th group less than or equal to the nitrogen intake volume, allowing each airtight tent in the i-th group to be quickly filled with nitrogen, rapidly reducing the oxygen content in each airtight tent in the i-th group, and improving the efficiency of nitrogen filling and de-oxygenation.

[0073] When the air extraction capacity of the extraction device is less than the air intake capacity of the nitrogen generator, the difference between their volumes should not be too large; for example, the air extraction capacity should be slightly less than the air intake capacity. This ensures that the air pressure inside the airtight tent reaches or nearly reaches equilibrium, preventing the tent from bursting.

[0074] According to some embodiments of this application, optionally, the distances between the multiple airtight tents in the i-th group and the nitrogen generator are different. When the nitrogen generator is used to simultaneously fill each airtight tent in the i-th group with nitrogen and reduce oxygen, the opening degree of the exhaust valve connected to the multiple airtight tents in the i-th group is positively correlated with the distance.

[0075] Nitrogen output from the nitrogen generator may experience flow loss during transmission, with the loss increasing over longer distances. Therefore, airtight tents farther from the generator can have their exhaust valves opened wider, while those closer can have theirs opened narrower. This allows for more even distribution of nitrogen output across all airtight tents in the i-th group when the generator simultaneously fills and deoxygenates the airtight tents, improving the uniformity of nitrogen filling.

[0076] According to some embodiments of this application, optionally, the purity of the nitrogen output by the nitrogen generator can be determined based on the oxygen content inside the airtight tents of each group. Taking the i-th group as an example, when the oxygen content inside each airtight tent of the i-th group is high, the nitrogen generator can output nitrogen of relatively high purity; when the oxygen content inside each airtight tent of the i-th group is low, the nitrogen generator can output nitrogen of relatively low purity, thereby making the oxygen content of the nitrogen output by the nitrogen generator lower than the oxygen content inside the airtight tents, and thus reducing the oxygen content inside the airtight tents through nitrogen replacement.

[0077] Specifically, in some embodiments, in S202 and S203, the nitrogen generator is used to simultaneously fill each airtight tent in the i-th group with nitrogen to reduce oxygen, which may include the following steps five to seven.

[0078] Step 5: Detect the oxygen content of multiple airtight tents in the i-th group.

[0079] For example, in some examples, at least one oxygen sensor can be installed in each airtight tent in the i-th group, and the oxygen content of each airtight tent in the i-th group can be detected by the oxygen sensor.

[0080] Step 6: Based on the maximum or average oxygen content among the multiple airtight tents in the i-th group, adjust the purity of the nitrogen output from the nitrogen generator to a range of 98% to 99.99%.

[0081] Among the detected oxygen contents of multiple airtight tents in the i-th group, the maximum value can be found. Alternatively, the average oxygen content of multiple airtight tents in the i-th group can be calculated. Based on this maximum or average value, the purity of the nitrogen output from the nitrogen generator can be adjusted within the range of 98% to 99.99%. This is beneficial in ensuring that the oxygen content of the nitrogen output from the nitrogen generator is lower than the oxygen content or average oxygen content in each airtight tent of the i-th group, thereby reducing the oxygen content in each airtight tent of the i-th group through nitrogen replacement.

[0082] For example, in some specific embodiments, step six: adjusting the purity of the nitrogen output from the nitrogen generator based on the maximum or average oxygen content among the multiple airtight tents in the i-th group may include the following steps:

[0083] When the maximum or average value is ≥5%, adjust the purity of the nitrogen output from the nitrogen generator to ≥98%.

[0084] When the maximum or average value is between 2% and 5%, adjust the purity of the nitrogen output from the nitrogen generator to ≥98.5%.

[0085] When the maximum or average value is between 2% and 1%, adjust the purity of the nitrogen output from the nitrogen generator to ≥99.5%.

[0086] When the maximum or average value is between 0.5% and 1%, adjust the purity of the nitrogen output from the nitrogen generator to ≥99.9%.

[0087] Step 7: Based on the nitrogen gas with adjusted purity output from the nitrogen generator, simultaneously fill each airtight tent in the i-th group with nitrogen to reduce oxygen.

[0088] After adjusting the purity of the nitrogen output from the nitrogen generator, the airtight tents in the i-th group can be simultaneously filled with nitrogen and oxygen reduced based on the nitrogen output with adjusted purity from the nitrogen generator.

[0089] In addition, during the step-by-step intermittent nitrogen filling and oxygen reduction process of the i-th group, the purity of the nitrogen output from the nitrogen generator can be adjusted multiple times, thereby rapidly reducing the oxygen content in each airtight tent of the i-th group and shortening the nitrogen filling and oxygen reduction time.

[0090] According to some embodiments of this application, optionally, the preset time required for settling can be increased or decreased according to the size of the tobacco stack inside the airtight tent and the oxygen reduction requirements of other stack locations. In some examples, each tobacco stack can be composed of multiple tobacco boxes stacked together, and the preset time required for settling can be positively correlated with the number of tobacco boxes stacked on top of the tobacco stack.

[0091] For example, the preset time required for settling can be between 1 and 3 hours. For each additional preset number of tobacco boxes in the tobacco stack, the preset time can be increased by 1 hour. For multiple airtight tents in the i-th group, the tobacco stack with the most tobacco boxes in the multiple airtight tents can be identified, and the preset time can be adjusted according to the number of tobacco boxes in that tobacco stack.

[0092] Thus, when there are a large number of tobacco boxes stacked in the tobacco stack, increasing the preset time required for settling can better balance the oxygen content inside the tobacco box and the stack, allowing it to reach a stable state.

[0093] According to some embodiments of this application, optionally, both the exhaust valve and the intake valve can be solenoid valves or electric valves. Both the exhaust valve and the intake valve can be automatically controlled to open or close by a control system or control equipment, thereby reducing the workload and error rate of manual valve opening and closing, and improving the rate and efficiency of nitrogen filling and oxygen reduction.

[0094] According to some embodiments of this application, the nitrogen generator may optionally include a skid-mounted low-oxygen gas workstation. In some examples, the skid-mounted low-oxygen gas workstation integrates an air compressor, refrigerated dryer, nitrogen generator, fan, integrated display and control box, clean air system, and pipeline valves. All these key components are mounted on the same skid chassis, forming a highly integrated and easily transportable unit. This design not only facilitates transportation and rapid on-site deployment but also optimizes space utilization and achieves modularity and portability of the equipment.

[0095] Based on the same technical concept as the above-described method embodiments, this application also provides a rapid oxygen de-oxidation and insecticidal control system for tobacco storage. The rapid oxygen de-oxidation and insecticidal control system for tobacco storage can be based on a tobacco warehouse, a nitrogen generator, an exhaust system, and a carbon dioxide source. Multiple tobacco stacks can be located in multiple different airtight tents within the tobacco warehouse. The nitrogen generator can be connected to the multiple airtight tents via inlet pipes, each equipped with an inlet valve. The exhaust system can be connected to the multiple airtight tents via exhaust pipes, each equipped with an exhaust valve. The multiple airtight tents are divided into multiple groups, each group comprising at least two airtight tents. In some embodiments, the carbon dioxide source can be connected to the multiple airtight tents via inlet pipes.

[0096] Figure 3 This is a schematic diagram of a rapid deoxygenation and insecticidal control system for tobacco storage provided in an embodiment of this application. Figure 3 As shown, the rapid oxygen desiccation and insecticidal control system 30 for tobacco storage may include a main control module 301 and a valve control component 302. The main control module 301 can communicate with the valve control component 302, a nitrogen generator, an exhaust system, and a carbon dioxide source. The valve control component 302 can communicate with an inlet valve and multiple exhaust valves. Exemplarily, the main control module 301 may include, but is not limited to, a computer or mobile terminal device, and the valve control component 302 may include, but is not limited to, a programmable logic controller (PLC).

[0097] The valve control component 302 can be used to close the first air intake valve corresponding to the i-th group in multiple groups and open the first exhaust valve corresponding to the i-th group. The main control module 301 can be used to control the air extraction equipment to simultaneously extract air from each airtight tent in the i-th group, where i is a positive integer.

[0098] The valve control component 302 can also be used to open the first air intake valve when the air pressure value in each airtight tent in the i-th group drops to a preset negative pressure threshold. The main control module 301 can also be used to shut down the air extraction equipment and control the nitrogen generator to simultaneously fill each airtight tent in the i-th group with nitrogen and reduce oxygen.

[0099] The valve control component 302 can also be used to open the first exhaust valve when the air pressure value in each airtight tent in the i-th group reaches the first preset normal pressure or positive pressure threshold. The main control module 301 can also be used to control the air extraction device to simultaneously extract air from each airtight tent in the i-th group while controlling the nitrogen generator to fill the air with nitrogen and reduce oxygen in each airtight tent in the i-th group.

[0100] The valve control component 302 can also be used to close the first intake valve and the first exhaust valve when the oxygen content in each airtight tent in the i-th group reaches the preset first-stage target value, and to allow the gas in each airtight tent in the i-th group to stand still for a preset time.

[0101] The main control module 301 can also be used to update the first-stage target value to obtain the updated second-stage target value, so that the control system can repeat the above steps based on the second-stage target value until the oxygen content in each airtight tent in the i-th group reaches the first preset content range, wherein the second-stage target value is less than the first-stage target value.

[0102] The main control module 301 can also be used to control the carbon dioxide gas source to fill each airtight tent in the i-th group with carbon dioxide or to add dry ice until the carbon dioxide content in each airtight tent in the i-th group reaches the second preset content range.

[0103] The rapid oxygen reduction and insecticidal control system for tobacco storage provided in the embodiments of this application, on the one hand, opens the first exhaust valve when the air pressure in each airtight tent in the i-th group reaches a first preset atmospheric pressure or positive pressure threshold. Simultaneously, while using a nitrogen generator to simultaneously fill the airtight tents in the i-th group with nitrogen to reduce oxygen, an exhaust device simultaneously extracts air from each airtight tent in the i-th group. This simultaneous nitrogen filling and extraction allows the gas in each airtight tent in the i-th group to circulate, achieving rapid gas replacement and quickly reducing the oxygen content in each airtight tent, thus improving the efficiency of nitrogen filling and oxygen reduction. On the other hand, by adopting a stepped intermittent nitrogen filling and oxygen reduction mode, multiple groups of airtight tents are filled and oxygenated in turn, which can rapidly and in batches reduce the oxygen content in each group of airtight tents, further improving the rate and efficiency of nitrogen filling and oxygen reduction. On the other hand, under low-oxygen conditions, by filling the airtight tent with an appropriate amount of carbon dioxide, the respiration of pests can be stimulated, the rate of dehydration and suffocation of pests can be accelerated, and the efficiency of pest control can be improved.

[0104] According to some embodiments of this application, the nitrogen generator may optionally include a skid-mounted low-oxygen gas workstation.

[0105] It should be noted that the rapid oxygen reduction and insecticidal control system for tobacco storage has the same or corresponding technical features as the rapid oxygen reduction and insecticidal method for tobacco storage provided in the above-described method embodiments. Figure 3 Each module / component in the control system shown has the function of implementing each step in the rapid oxygen reduction and insecticidal method for tobacco storage provided in the above method embodiments, and can achieve its corresponding technical effect. For the sake of brevity, it will not be described in detail here.

[0106] It should be understood that each block or combination thereof in a flowchart and / or block diagram may be implemented by computer program instructions, by special-purpose hardware performing the specified function or action, or by a combination of special-purpose hardware and computer instructions. For example, these computer program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to form a machine that enables the implementation of the function / action specified in each block or combination thereof in the flowchart and / or block diagram, as executed by such processor. Such processor may be a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit.

[0107] The functional blocks shown in the structural block diagrams of this application can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc.; when implemented in software, they are programs or code segments used to perform the required tasks. Programs or code segments can be stored in memory or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. Code segments can be downloaded via computer networks such as the Internet or intranets.

[0108] It should be noted that this application is not limited to the specific configurations and processes described above or shown in the figures. The above descriptions are merely specific embodiments of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the described systems, devices, modules, or units can be referred to the corresponding processes in the method embodiments, and need not be repeated here. It should be understood that the scope of protection of this application is not limited thereto. Any person skilled in the art can conceive of various equivalent modifications or substitutions within the scope of the technology disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application.

Claims

1. A method for rapid oxygen reduction and insect control for tobacco storage, characterized by, The method is based on a tobacco warehouse, a nitrogen production device and a gas extraction device, a plurality of tobacco stacks are respectively located in a plurality of different airtight tents in the tobacco warehouse, the nitrogen production device is connected with the plurality of airtight tents through an air inlet pipeline, an air inlet valve is arranged on the air inlet pipeline, the gas extraction device is connected with the plurality of airtight tents through an air outlet pipeline, an air outlet valve is arranged on the air outlet pipeline; wherein the plurality of airtight tents are divided into a plurality of groups, each group includes at least two airtight tents; the method comprises: closing the first air inlet valve corresponding to the i-th group of the plurality of groups, opening the first air outlet valve corresponding to the i-th group, and opening the gas extraction device to simultaneously extract air from each airtight tent in the i-th group; when the air pressure value in each airtight tent in the i-th group reaches a preset negative pressure threshold, the gas extraction device is closed, the first air inlet valve is opened, and the nitrogen production device is used to simultaneously charge nitrogen and reduce oxygen in each airtight tent in the i-th group; when the air pressure value in each airtight tent in the i-th group reaches a first preset normal pressure or positive pressure threshold, the first air outlet valve is opened, and while the nitrogen production device is used to simultaneously charge nitrogen and reduce oxygen in each airtight tent in the i-th group, the gas extraction device is used to simultaneously extract air from each airtight tent in the i-th group; when the oxygen content in each airtight tent in the i-th group reaches a preset first stage target value, the first air inlet valve and the first air outlet valve are closed, and after each airtight tent in the i-th group is stationary for a preset time, the first stage target value is updated, and a second stage target value after the update is less than the first stage target value; based on the second stage target value, the above steps are repeatedly executed, so that the oxygen content in each airtight tent in the i-th group continuously decreases; after the oxygen content in each airtight tent in the i-th group reaches a first preset range, carbon dioxide is charged into each airtight tent in the i-th group or dry ice is put in, so that the carbon dioxide content in each airtight tent in the i-th group reaches a second preset range.

2. The method of claim 1, wherein, The method further comprises: during the stationary process, the second air inlet valve corresponding to the j-th group of the plurality of groups is closed, the second air outlet valve corresponding to the j-th group is opened, and the gas extraction device is used to simultaneously extract air from each airtight tent in the j-th group, j≠i and j is a positive integer; when the air pressure value in each airtight tent in the j-th group reaches a preset negative pressure threshold, the gas extraction device is closed, the second air inlet valve is opened, and the nitrogen production device is used to simultaneously charge nitrogen and reduce oxygen in each airtight tent in the j-th group; when the air pressure value in each airtight tent in the j-th group reaches a first preset normal pressure or positive pressure threshold, the second air outlet valve is opened, and while the nitrogen production device is used to simultaneously charge nitrogen and reduce oxygen in each airtight tent in the j-th group, the gas extraction device is used to simultaneously extract air from each airtight tent in the j-th group; when the oxygen content in each airtight tent in the j-th group reaches a preset first stage target value, the second air inlet valve and the second air outlet valve are closed, and each airtight tent in the j-th group is stationary for a preset time.

3. The method of claim 1, wherein, When the nitrogen filling and oxygen reduction is simultaneously performed on each airtight tent in the i th group by using the nitrogen generating device and the air extraction device, the air extraction amount of the air extraction device is less than or equal to the air intake amount of the nitrogen generating device.

4. The method of claim 1, wherein, The distances between the airtight tents in the i th group and the nitrogen generating device are different, and when the nitrogen filling and oxygen reduction is simultaneously performed on each airtight tent in the i th group by using the nitrogen generating device, the opening degrees of the exhaust valves in communication with the airtight tents in the i th group are positively correlated with the distances.

5. The method of claim 1, wherein, The method for simultaneously performing the nitrogen filling and oxygen reduction on each airtight tent in the i th group by using the nitrogen generating device comprises the following steps: detecting the oxygen contents of the airtight tents in the i th group; adjusting the purity of the nitrogen gas output by the nitrogen generating device according to the maximum value or the average value of the oxygen contents of the airtight tents in the i th group, wherein the purity is adjusted in the range of 98% to 99.99%; simultaneously performing the nitrogen filling and oxygen reduction on each airtight tent in the i th group based on the nitrogen gas of the adjusted purity output by the nitrogen generating device.

6. The method of claim 5, wherein, The method for adjusting the purity of the nitrogen gas output by the nitrogen generating device according to the maximum value or the average value of the oxygen contents of the airtight tents in the i th group comprises the following steps: when the maximum value or the average value is greater than or equal to 5%, adjusting the purity of the nitrogen gas output by the nitrogen generating device to be greater than or equal to 98%; when the maximum value or the average value is in the range of 2% to 5%, adjusting the purity of the nitrogen gas output by the nitrogen generating device to be greater than or equal to 98.5%; when the maximum value or the average value is in the range of 2% to 1%, adjusting the purity of the nitrogen gas output by the nitrogen generating device to be greater than or equal to 99.5%; when the maximum value or the average value is in the range of 0.5% to 1%, adjusting the purity of the nitrogen gas output by the nitrogen generating device to be greater than or equal to 99.9%.

7. The method of claim 1, wherein, The first preset content range comprises 0% to 0.5%, and the second preset content range comprises 2% to 10%.

8. The method of claim 1, wherein, The preset time length is positively correlated with the number of the tobacco bales in the tobacco bin.

9. A rapid oxygen reduction insect control system for tobacco storage, characterized by, The control system is based on a tobacco warehouse, a nitrogen generating device, an air extraction device and a carbon dioxide source, a plurality of tobacco bales are respectively located in a plurality of different airtight tents in the tobacco warehouse, the nitrogen generating device is connected with the airtight tents through an air intake pipeline, an air intake valve is arranged on the air intake pipeline, the air extraction device is connected with the airtight tents through an air exhaust pipeline, and an air exhaust valve is arranged on the air exhaust pipeline; wherein the airtight tents are divided into a plurality of groups, and each group comprises at least two airtight tents. The control system comprises a main control module and a valve control assembly. The valve control assembly is used to close a first air intake valve corresponding to an i th group in a plurality of groups, and open a first air exhaust valve corresponding to the i th group, and the main control module is used to control the air extraction device to simultaneously perform air extraction on each airtight tent in the i th group, wherein i is a positive integer. The valve control assembly is further used to open the first air intake valve when the air pressure value in each airtight tent in the i th group decreases to a preset negative pressure threshold, and the main control module is further used to close the air extraction device and control the nitrogen generating device to simultaneously perform the nitrogen filling and oxygen reduction on each airtight tent in the i th group. The valve control assembly is further configured to open the first exhaust valve when the air pressure in each of the airtight tents in the i-th group reaches a first preset normal pressure or positive pressure threshold, and the master control module is further configured to control the air extraction device to simultaneously extract air from each of the airtight tents in the i-th group while controlling the nitrogen production device to simultaneously fill nitrogen and reduce oxygen in each of the airtight tents in the i-th group. The valve control assembly is further configured to close the first air inlet valve and the first exhaust valve when the oxygen content in each of the airtight tents in the i-th group reaches a first preset target value of a first stage, and to allow the gas in each of the airtight tents in the i-th group to stand for a preset time length. The master control module is further configured to update the first stage target value to obtain an updated second stage target value, so that the control system repeats the above steps based on the second stage target value until the oxygen content in each of the airtight tents in the i-th group reaches a first preset content range, wherein the second stage target value is less than the first stage target value. The master control module is further configured to control the carbon dioxide source to fill carbon dioxide or input dry ice into each of the airtight tents in the i-th group until the carbon dioxide content in each of the airtight tents in the i-th group reaches a second preset content range.

10. A rapid oxygen-depletion insect control system for tobacco storage as defined in claim 9, wherein, The nitrogen production device comprises a skid-mounted low-oxygen gas workstation.

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