Control method for a low-oxygen gas-regulated insecticidal system
By using a low-oxygen controlled insecticidal system with automatically controlled nitrogen purity switching technology, the problem of low oxygen reduction efficiency in large-scale enclosed spaces is solved, achieving a highly efficient and safe insecticidal effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TIANJIN CNRO SCI TECH
- Filing Date
- 2022-12-09
- Publication Date
- 2026-06-23
AI Technical Summary
Existing controlled atmosphere pest control methods, such as nitrogen filling to reduce oxygen, are inefficient in large-scale enclosed spaces and require manual operation. Aluminum phosphide fumigation poses safety hazards, while freezing pest control is energy-intensive and can easily damage stored goods.
The low-oxygen regulation insecticidal system utilizes Class I and Class II nitrogen generators connected to multiple airtight spaces via a gas regulation station. It controls the opening and closing of valves and automatically switches the nitrogen purity to achieve efficient oxygen reduction.
It improves the oxygen reduction efficiency of large-scale enclosed spaces, reduces manual operation, lowers pest control costs, ensures the safety of stored goods, and shortens the pest control cycle.
Smart Images
Figure CN115756002B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of modified atmosphere packaging (MAP) insecticide technology, and particularly to a control method for a low-oxygen MAP insecticide system. Background Technology
[0002] Currently, the main pest control methods include three types: traditional modified atmosphere packaging, cryogenic spraying, and aluminum phosphide fumigation. Aluminum phosphide fumigation can kill most pests, but aluminum phosphide reacts with moisture in the air to produce phosphine gas, which can easily ignite and cause fires; furthermore, phosphine can cause poisoning. Cryogenic spraying equipment needs to be run year-round, resulting in high energy consumption; and stored items are prone to condensation after removal, leading to moisture absorption, softening, and even rotting.
[0003] The commonly used modified atmosphere packaging (MAP) method for pest control is nitrogen flushing and oxygen deoxygenation, which involves filling a sealed space with nitrogen to replace oxygen and thus kill insects. However, this method is suitable for small-scale, enclosed spaces. When multiple enclosed spaces need to be flushed with nitrogen simultaneously, the limited nitrogen output of the nitrogen generator leads to low oxygen deoxygenation efficiency. Furthermore, manual switching of pipelines is required to flush nitrogen into multiple enclosed spaces, increasing the cost of pest control. Summary of the Invention
[0004] To address the technical problems existing in the prior art, this invention proposes a control method for a low-oxygen controlled insecticidal system. The method is based on a low-oxygen controlled insecticidal system comprising: a first type of nitrogen generator, a second type of nitrogen generator, a gas regulating station, multiple airtight spaces, and a control unit. The multiple airtight spaces are divided into one or more groups, each group comprising N airtight spaces, where N≥1. Adjacent airtight spaces in each group are airtightly connected via pipelines, and each pipeline is equipped with a valve. The gas regulating station comprises: a first branch, a second branch, and multiple valves. The inlet of the first branch is airtightly connected to the outlet of the first type of nitrogen generator; the inlet of the second branch is airtightly connected to the outlet of the second type of nitrogen generator. The control method of the low-oxygen controlled insecticidal system includes: The control unit controls the opening of multiple valves between adjacent airtight spaces in each group, while closing other valves. It also controls the opening of one or more outlets of the first branch with valves between the first airtight spaces in one or more groups, allowing the first type of nitrogen generator to introduce nitrogen into the multiple airtight spaces in each group. When the oxygen content in the target airtight space of any of the groups falls below a first preset threshold after a first time interval, the control unit closes the valve between the outlet of the first branch and the first airtight space in that group, and opens the valve between the outlet of the second branch and the first airtight space in that group, allowing the second type of nitrogen generator to introduce nitrogen into the airtight space in that group. The target airtight space can be the first airtight space or the Nth airtight space. Finally, when the oxygen content in all airtight spaces falls below a second preset threshold after a second time interval, all valves in the system are closed.
[0005] In the method described above, the first preset threshold is 1%-5%; the second preset threshold is 0.1%-0.5%.
[0006] In the method described above, the values of the first duration and the second duration are both in the range of 20-60 minutes.
[0007] The method described above also includes: when the oxygen content in the airtight space is lower than the first or second preset threshold, using higher purity nitrogen to reduce oxygen or adopting a combination of active and passive methods to reduce oxygen.
[0008] The method described above further includes: when reducing oxygen in multiple airtight spaces connected in series in each group, when the oxygen content in the airtight space connected to the air outlet is lower than a first preset threshold or a second preset threshold, controlling the valve between the air outlet and the next airtight space to open.
[0009] In the method described above, the highest nitrogen purity output by the second type of nitrogen generator is higher than that output by the first type of nitrogen generator, and the first type of nitrogen generator and the second type of nitrogen generator do not simultaneously fill the airtight space in the same group with nitrogen to reduce oxygen.
[0010] In the method described above, the target airtight space can be the airtight space with the largest volume in each group.
[0011] The method described above reduces the oxygen content in multiple airtight spaces to a level that is stable at a second preset threshold for 1-96 hours; the insecticidal cycle of the low-oxygen controlled insecticidal system is 5-20 days.
[0012] As described above, in the low-oxygen controlled insecticidal system, the first type of nitrogen generating device includes a membrane nitrogen generating device, and the purity of the output nitrogen gas is in the range of 95% to 99%.
[0013] As described above, in the low-oxygen controlled insecticidal system, the second type of nitrogen generating device includes a molecular sieve nitrogen generating device, and the purity of the output nitrogen gas is in the range of 98% to 99.9%.
[0014] The control unit in this application can automatically switch between the input nitrogen from the first type of nitrogen generator and the second type of nitrogen generator by controlling the opening and closing of the gas regulating station and the valves connected to the airtight space, thus enabling the storage of artifacts in a low-oxygen environment. Furthermore, the multiple airtight spaces are connected by valves, which can make full use of nitrogen, making it suitable for large-scale oxygen reduction applications and improving the efficiency of oxygen reduction and pest control. Attached Figure Description
[0015] The preferred embodiments of the present invention will now be described in further detail with reference to the accompanying drawings, wherein:
[0016] Figure 1 This is a schematic flowchart of a control method for a low-oxygen controlled insecticidal system according to an embodiment of this application;
[0017] Figure 2 This is a schematic diagram of a low-oxygen controlled-release insecticidal system according to an embodiment of this application;
[0018] Figure 3 This is a schematic diagram of a gas regulating station structure according to an embodiment of this application;
[0019] Figure 4 This is a schematic diagram of the status interface of an oxygen content monitoring device according to an embodiment of this application;
[0020] Figure 5 This is a schematic diagram of a controlled atmosphere parameter display interface according to an embodiment of this application;
[0021] Figure 6 This is a schematic diagram of an insecticidal scenario with a single main path and a single airtight space according to an embodiment of this application;
[0022] Figure 7 This is a schematic diagram of an insecticidal scenario with a single main path and multiple airtight spaces according to an embodiment of this application;
[0023] Figure 8 This is a schematic diagram of an insecticidal scenario in a multi-branch single airtight space according to an embodiment of this application;
[0024] Figure 9 This is a schematic diagram of a multi-branch, multi-airtight space insecticidal scenario according to an embodiment of this application;
[0025] Figure 10 This is a schematic diagram of an insecticidal scenario in a matrix-type airtight space according to an embodiment of this application. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0027] In the following detailed description, reference can be made to the accompanying drawings, which form part of this application and illustrate specific embodiments of the present application. In the drawings, similar reference numerals describe substantially similar components in different figures. Specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to implement the technical solutions of the present application. It should be understood that other embodiments may also be utilized, or structural, logical, or electrical changes may be made to the embodiments of the present application.
[0028] Figure 1 This is a schematic flowchart of a control method for a low-oxygen controlled-pressure insecticidal system according to an embodiment of this application. The method is based on a low-oxygen controlled-pressure insecticidal system, which includes: a first type of nitrogen generator, a second type of nitrogen generator, a gas regulating station, multiple airtight spaces, and a control unit. The multiple airtight spaces are divided into one or more groups, each group including N airtight spaces, where N≥1. Adjacent airtight spaces in each group are airtightly connected by pipelines, and each pipeline is equipped with a valve. The gas regulating station includes: a first branch, a second branch, and multiple valves. The inlet of the first branch is airtightly connected to the outlet of the first type of nitrogen generator; the inlet of the second branch is airtightly connected to the outlet of the second type of nitrogen generator. The control method of the low-oxygen controlled-pressure insecticidal system includes:
[0029] S101: This control unit controls the opening of multiple valves between adjacent airtight spaces in each group and the closing of other valves, and controls the opening of one or more outlets of the first branch with the valves between the first airtight spaces in one or more groups, so that the first type of nitrogen generator can introduce nitrogen into the multiple airtight spaces in each group.
[0030] S102: When the oxygen content in the target airtight space of any one of the groups is lower than a first preset threshold and after a first time interval, the valve between the outlet of the first branch and the first airtight space of that group is closed, and the valve between the outlet of the second branch and the first airtight space of that group is opened, so that the second type of nitrogen generator introduces nitrogen into the airtight space of that group. The target airtight space can be the first airtight space or the Nth airtight space; and
[0031] S103: When the oxygen content in all airtight spaces is lower than the second preset threshold and after a second time interval, close all valves in the system.
[0032] This application utilizes a gas regulating station to airtightly connect the first and second type nitrogen generators to multiple airtight spaces in one or more groups. Through the gas regulating station, the first and second type nitrogen generators can be controlled to sequentially fill the same group of airtight spaces with nitrogen to reduce oxygen, thereby improving oxygen reduction efficiency and reducing manual operation. Furthermore, adjacent airtight spaces in each group are airtightly connected by valves, allowing multiple airtight spaces in each group to be connected in series, which improves nitrogen utilization and increases the efficiency of nitrogen filling and oxygen reduction.
[0033] According to embodiments of this application, optionally, the first preset threshold is 1%-5%; the second preset threshold is 0.1%-0.5%. When the oxygen content in the airtight space is at the first preset threshold of 1%-5%, it is difficult to further reduce the oxygen content using the first type of nitrogen generator. In this case, switching to the second type of nitrogen generator can quickly reduce the oxygen content below the preset threshold. When the oxygen content in the airtight space is at 0.1%-0.5%, it can kill most pests and insect eggs, improving the safety of the artifacts within the airtight space.
[0034] According to an embodiment of this application, optionally, the first duration and the second duration are both in the range of 20-60 minutes. When the conditions for switching oxygen content are met, the detection equipment may have errors. Therefore, extending the switching time by 20-60 minutes can avoid the problem of premature switching due to detection equipment errors and improve the efficiency of oxygen reduction.
[0035] Optionally, according to embodiments of this application, the method further includes: when the oxygen content in the airtight space is lower than a first or second preset threshold, using higher purity nitrogen to reduce oxygen or adopting a combination of active and passive methods to reduce oxygen. Passive oxygen reduction may involve adding appropriate amounts of oxygen absorbers and desiccants according to the volume of the airtight space to maintain the oxygen content within the airtight space at a preset threshold level, ensuring insecticidal quality. Combining passive oxygen reduction using oxygen absorbers and desiccants with active oxygen reduction using nitrogen purging can reduce the operating time of the nitrogen generator and extend its service life.
[0036] Optionally, according to embodiments of this application, the method further includes: when reducing oxygen content in multiple airtight spaces connected in series in each group, if the oxygen content in the airtight space connected to the outlet is lower than a first preset threshold or a second preset threshold, controlling the valve between the outlet and the next airtight space to open. When the oxygen content in the airtight space connected to the outlet is lower than the first preset threshold or the second preset threshold, it is difficult to continuously reduce the oxygen content using nitrogen of the same purity. Opening the valve between the outlet and the next airtight space can reduce the nitrogen delivery distance and improve the nitrogen delivery efficiency.
[0037] According to an embodiment of this application, optionally, the highest nitrogen purity output by the second type of nitrogen generator is higher than that output by the first type of nitrogen generator, and the first and second types of nitrogen generators do not simultaneously purge the same group of airtight spaces with nitrogen to reduce oxygen. The second type of nitrogen generator can be a molecular sieve nitrogen generator, and the first type of nitrogen generator can be a membrane nitrogen generator, with the highest nitrogen purity output by the molecular sieve nitrogen generator being higher than that output by the membrane nitrogen generator. By using the first and second types of nitrogen generators to purge the same group of airtight spaces with nitrogen to reduce oxygen sequentially, the oxygen reduction time can be shortened.
[0038] According to an embodiment of this application, optionally, the target airtight space can be the airtight space with the largest volume in each group. Using the airtight space with the largest volume in each group as the target airtight space can improve the accuracy of switching between different nitrogen generation device conditions.
[0039] According to embodiments of this application, optionally, the time for reducing and stabilizing the oxygen content in multiple airtight spaces to a second preset threshold is 1-96 hours; the insecticidal cycle of this low-oxygen controlled-flow insecticidal system is 5-20 days. The number of multiple airtight spaces can be 1-12, and the time for reducing and stabilizing the oxygen content in multiple airtight spaces to the second preset threshold is 1-96 hours, which shortens the oxygen reduction time by approximately two-thirds compared to conventional nitrogen-filling deoxygenation methods. Simultaneously, the insecticidal cycle is also shortened by approximately half.
[0040] Optionally, according to an embodiment of this application, the first type of nitrogen generator includes a membrane nitrogen generator, with the output nitrogen purity ranging from 95% to 99%. The membrane nitrogen generator has a large output volume, which can quickly reduce the oxygen content in the airtight space to the target value, shortening the oxygen reduction time.
[0041] Optionally, according to an embodiment of this application, the second type of nitrogen generating device includes a molecular sieve nitrogen generating device, and the purity of the output nitrogen gas is in the range of 98% to 99.9%. The high purity of the nitrogen gas output by the molecular sieve nitrogen generating device can reduce the oxygen content in the airtight space to an oxygen content level that kills most pests and insect eggs, preventing their survival.
[0042] The above description, through multiple embodiments, illustrates various implementations of the control method for the low-oxygen controlled-pressure insecticidal system according to embodiments of this application. The following, through several specific examples, describes the control method for the low-oxygen controlled-pressure insecticidal system according to embodiments of this application.
[0043] Figure 2 This is a schematic diagram of a low-oxygen controlled-release insecticidal system according to an embodiment of this application. Figure 2 As shown, the low-oxygen controlled-flow insecticidal system 100 includes a first-type nitrogen generator 110, a second-type nitrogen generator 120, a gas regulating station 130, and multiple airtight spaces. The nitrogen output from the second-type nitrogen generator 120 has a higher purity than that output from the first-type nitrogen generator 110. The first-type nitrogen generator 110 and the second-type nitrogen generator 120 are airtightly connected to the multiple airtight spaces via the gas regulating station 130.
[0044] According to one embodiment of this application, the first type of nitrogen generator 110 includes a membrane nitrogen generator, and the purity of the output nitrogen gas is in the range of 95% to 99%. The second type of nitrogen generator includes a molecular sieve nitrogen generator, and the purity of the output nitrogen gas is in the range of 98% to 99.9%. The membrane nitrogen generator produces nitrogen quickly and can rapidly reduce the oxygen content in the airtight space to a first preset threshold; the molecular sieve nitrogen generator outputs nitrogen with high purity and can reduce the oxygen content in the airtight space to below the preset threshold to meet the needs of pest control. The first preset threshold is 1%-5%, and the second preset threshold is 0.1%-0.5%. When the oxygen content in the airtight space is between the preset threshold of 1% and 5%, it is difficult to further reduce the oxygen content using the first type of nitrogen generator. Switching to the second type of nitrogen generator at this point can quickly reduce the oxygen content below the preset threshold. When the oxygen content in the airtight space is between 0.1% and 0.5%, it can kill the vast majority of pests and insect eggs, improving the safety of the stored items in the airtight space. By using the first type of nitrogen generator 110 and the second type of nitrogen generator 120 to deoxygenate the same group of airtight spaces, nitrogen of different purities can be introduced into the airtight spaces to achieve the purpose of rapid oxygen deoxygenation.
[0045] Multiple airtight spaces are divided into one or more groups, each group comprising N airtight spaces, where N≥1. Adjacent airtight spaces within each group are airtightly connected via pipelines, each pipeline equipped with a valve. This allows multiple airtight spaces within a group to be connected in series, and their order of nitrogen introduction can be designated as: first space, second space, ..., Nth space. In a low-oxygen controlled-release insecticide system, the number of airtight spaces is typically 6-12. (Reference) Figure 2 For example, multiple airtight spaces are arranged in three groups, with each group containing three airtight spaces connected in series. Airtight spaces 101, 102, and 103 form the first group, airtight spaces 201, 202, and 203 form the second group, and so on.
[0046] According to one embodiment of this application, the airtight space includes a rigid airtight enclosure and a flexible airtight enclosure. The rigid airtight enclosure can be a controlled atmosphere storage unit, and the flexible airtight enclosure can be an airtight tent. The airtight tent is fabricated on-site using a high-barrier composite membrane. The on-site fabrication process allows for the design of the tent's dimensions based on the size of the warehouse space, improving space utilization. The airtight space has a high-barrier oxygen permeability of 0.005 cm⁻¹. 3 \(m 3 (24h·0.1MPa) effectively avoids indoor and outdoor gas exchange, reduces the start-up frequency of nitrogen generators, lowers operating costs, and extends the service life of nitrogen generators.
[0047] When simultaneously reducing oxygen in three groups of airtight spaces, the first type of nitrogen generator 110 is first divided into three output gas paths. Valves connected to airtight spaces 101, 201, and 301 are opened, and multiple valves between adjacent airtight spaces in each group are opened. The outlet valves of airtight spaces 103, 203, and 303 are opened, while other valves are closed, allowing nitrogen gas to be introduced into the multiple airtight spaces connected in series in each group by the first type of nitrogen generator 110. When the oxygen content in the target airtight space of any of the three groups falls below a preset oxygen content threshold after a first time interval, the valve between the outlet of the first branch and the airtight space in that group is closed, and the valve between the outlet of the second branch and the first airtight space in that group is opened, allowing nitrogen gas to be introduced into the multiple airtight spaces connected in series by the second type of nitrogen generator. Finally, when the oxygen content in all airtight spaces falls below the preset threshold after a second time interval, all valves in the system are closed. Compared to filling a single airtight space with nitrogen and then releasing the nitrogen into the air, connecting three airtight spaces in series allows for the effective use of nitrogen. Each time, oxygen can be reduced in nine airtight spaces simultaneously, thus shortening the deoxygenation time and improving the efficiency of pest control.
[0048] According to one embodiment of this application, the target airtight space can be the first or last airtight space in each group, or it can be the airtight space with the largest volume in each group. When the volumes of multiple airtight spaces in each group are inconsistent, the airtight space with the largest volume is regarded as the target airtight space, thereby improving the accuracy of detection.
[0049] According to one embodiment of this application, the values of the first duration and the second duration are both in the range of 20-60 minutes. When the conditions for switching oxygen content are met, the detection equipment may have errors. Therefore, extending the switching time by 20-60 minutes can avoid the problem of premature switching caused by detection equipment errors and improve the efficiency of oxygen reduction.
[0050] According to one embodiment of this application, when the oxygen content in the airtight space decreases to a preset threshold, an oxygen absorber and a desiccant are placed in the airtight space to maintain low oxygen levels for a longer period. Adding appropriate amounts of oxygen absorber and desiccant based on the volume of the airtight space can maintain the oxygen content within the airtight space at the preset threshold level, ensuring the quality of insecticidal treatment. Furthermore, passively reducing oxygen through the use of oxygen absorbers and desiccants can reduce the operating time of the nitrogen generator and extend its service life. According to another embodiment of this application, active and passive oxygen reduction methods can be combined to achieve rapid oxygen reduction.
[0051] Figure 3 This is a schematic diagram of a gas regulating station structure according to an embodiment of this application. Figure 3 As shown, the gas regulating station 130 includes a first branch 131, a second branch 132, and multiple valves. The inlet of the first branch 131 is airtightly connected to the outlet of the first type of nitrogen generator 110. The first branch 131 has one or more outlets, which are respectively airtightly connected to N airtight spaces in each group through pipelines. Each pipeline is equipped with valves 1311, 1312, and 1313. The inlet of the second branch 132 is airtightly connected to the outlet of the second type of nitrogen generator 120. The second branch 132 has one or more outlets, which are respectively airtightly connected to N airtight spaces in each group through pipelines. Each pipeline is equipped with valves 1321, 1322, and 1323. When the content in the airtight space decreases to the first preset threshold, the gas regulating station 130 will immediately close valves 1311, 1312, and 1313 and open valves 1321, 1322, and 1323 to continue filling the airtight space with high-purity nitrogen, thus shortening the switching time and improving the efficiency of nitrogen filling and oxygen reduction.
[0052] According to one embodiment of this application, an exhaust port is provided on the first branch 131 at the outlet of the first type of nitrogen generator 110 and on the second branch 132 at the outlet of the second type of nitrogen generator 120. This exhaust port is used to discharge nitrogen into the atmosphere when the nitrogen produced by the first type of nitrogen generator 110 and / or the second type of nitrogen generator 120 does not meet the concentration requirements. Valves 1314 and 1324 are respectively installed on the pipes connected to the exhaust port. By controlling the opening and closing of valves 1314 and / or 1324, the nitrogen produced by the first type of nitrogen generator 110 and / or the second type of nitrogen generator 120 can be controlled and emptied. Through the exhaust port, nitrogen that does not meet the required concentration can be discharged instead of being introduced into the airtight space, thus avoiding delays in the oxygen reduction process. Valves 1311, 1312, 1313, 1321, 1322, 1323, 1314, and 1324 can be automatic valves or manual valves. Automatic valves include electric ball valves. Those skilled in the art should understand that other types of valves can also be used in the solutions of this application, and no limitation is made herein.
[0053] like Figure 2 As shown, the low-oxygen controlled atmosphere insecticidal system also includes a control unit 140. The control unit 140 is electrically connected to the first type of nitrogen generator 110 and the second type of nitrogen generator 120, respectively, and is used to control the operating status of the first type of nitrogen generator 110, the second type of nitrogen generator 120, and multiple valves in the system, so that the controlled atmosphere parameters in multiple airtight spaces in the system reach predetermined standards. By switching between different nitrogen generators to input nitrogen of different concentrations into the same airtight space, the control unit 140 can quickly reduce the oxygen content in the airtight space and shorten the oxygen reduction time.
[0054] According to one embodiment of this application, the low-oxygen controlled atmosphere pest control system further includes a controlled atmosphere parameter monitoring device (not shown), which is electrically connected to the control unit. This device monitors the controlled atmosphere parameters in multiple airtight spaces within the system and sends the monitoring results to the control unit 140. The controlled atmosphere parameter monitoring device includes at least one of the following: an oxygen content monitoring device, a temperature monitoring device, and a humidity monitoring device. The oxygen content monitoring device is located within the airtight space, while the temperature and humidity monitoring devices are located inside and / or outside the airtight space, detecting the temperature and humidity inside and / or outside the airtight space. The controlled atmosphere parameter monitoring device can promptly feed the monitoring data back to the control unit 140, reducing the need for manual monitoring and saving labor costs.
[0055] According to one embodiment of this application, the low-oxygen controlled atmosphere pest control system further includes a communication module (not shown), which is electrically connected to the control unit 140. This module is used to acquire the system's operating status parameters and controlled atmosphere parameters from the control unit 140 and send them to an Internet of Things (IoT) service platform. Through the IoT service platform, users can view the data from anywhere, determine the mortality status of pests based on data changes, and monitor the pest control process. Furthermore, when the low-oxygen controlled atmosphere system malfunctions, the communication module can also promptly send fault information to the user terminal to avoid unnecessary losses.
[0056] Figure 4 This is a schematic diagram of the status interface of an oxygen content monitoring device according to an embodiment of this application; Figure 5 This is a schematic diagram of a controlled atmosphere parameter display interface according to one embodiment of this application. The low-oxygen controlled atmosphere insecticidal system also includes a display module (not shown), which is electrically connected to the control unit and is used to display controlled atmosphere parameters within and / or outside multiple airtight spaces. Figure 4 As shown, the display module can simultaneously display the operating status of up to 40 oxygen content monitoring devices, with green checkmarks indicating operation and red crosses indicating disabling. Furthermore, the display module can also display new information such as oxygen content setpoints and low-oxygen alarm values.
[0057] like Figure 5 As shown, the display module can simultaneously display controlled atmosphere parameters (CAP) for multiple airtight spaces, including oxygen content, temperature, and humidity. Each airtight space has a unique number for easy user reference. Displaying CAP parameters for multiple airtight spaces simultaneously allows for quick assessment of oxygen depletion in each space, enabling timely problem detection. Furthermore, the display module can show the trend of CAP parameters within each airtight space and issue alerts to the user when abnormal changes occur.
[0058] In this application, the multiple airtight spaces are divided into one or more groups, each group comprising N airtight spaces, where N≥1. Adjacent airtight spaces within each group are airtightly connected via pipelines, and each pipeline is equipped with a valve. The airtight spaces are divided into one or more groups, with different pipeline connection methods; the number of airtight spaces in each group is one or more, and the pipeline connection methods will also differ. The low-oxygen insecticidal system of this application enables various insecticidal scenarios, as detailed in the following embodiments and schematic diagrams.
[0059] Figure 6 This is a schematic diagram of an insecticidal scenario with a single main path and a single airtight space, according to an embodiment of this application. For example... Figure 6As shown, the airtight spaces are divided into three groups, with one airtight space in each group. Main lines 610, 620, and 630 are airtightly connected to airtight spaces 611, 621, and 631 respectively via pipelines, each equipped with a valve. When filling the airtight spaces with nitrogen to reduce oxygen and kill insects, nitrogen from the first type of nitrogen generator is first transported to airtight spaces 611, 621, and 631 via main lines 610, 620, and 630. When the oxygen content in any of the airtight spaces 611, 621, and 631 falls below a first preset value, the system switches to the second type of nitrogen generator on the corresponding main line, and nitrogen from the second type of nitrogen generator is transported to that airtight space to continue reducing oxygen, until the oxygen content in all airtight spaces drops below the second preset value.
[0060] Figure 7 This is a schematic diagram of a pest control scenario with a single main path and multiple airtight spaces, according to an embodiment of this application. Figure 7 As shown, the airtight space is divided into three groups, each containing three airtight spaces. Specifically, main lines 710, 720, and 730 are airtightly connected to the first airtight spaces 711, 721, and 731 in each group via pipelines, and each pipeline is equipped with a valve. Adjacent airtight spaces in each group are airtightly connected via valves. When filling multiple airtight spaces with nitrogen to reduce oxygen and kill insects, firstly, the valves between adjacent airtight spaces in each group are opened, making the multiple airtight spaces in each group connected in series. The nitrogen output from the first type of nitrogen generator is then transported through main lines 710, 720, and 730 to the first airtight spaces 711, 721, and 731, respectively. The nitrogen in the first airtight space 711 then passes through airtight spaces 712 and 713, and is finally discharged into the atmosphere. The nitrogen in the first airtight space 721 then passes through... The nitrogen in the first airtight space 731 passes through airtight spaces 732 and 733 in sequence and is finally discharged into the atmosphere. When the oxygen content of the target airtight space in any of the three airtight spaces is lower than the first preset value, the system switches to the second type of nitrogen generator on the corresponding main road and delivers the nitrogen output from the second type of nitrogen generator to the airtight space to continue reducing oxygen until the oxygen content of all airtight spaces drops below the second preset value.
[0061] Figure 8 This is a schematic diagram of an insecticidal scenario using a multi-branch, single-airtight space according to an embodiment of this application. Figure 8As shown, the main pipeline 801 branches into three branches 810, 820, and 830, which are respectively airtightly connected to airtight spaces 811, 821, and 831, and each pipeline is equipped with a valve. When filling the airtight spaces with nitrogen to reduce oxygen and kill insects, the nitrogen output from the first type of nitrogen generator is first transported to the airtight spaces 811, 821, and 831 through the main pipeline 801 and branches 810, 821, and 830, respectively. When the oxygen content in airtight spaces 811, 821, and 831 falls below a first preset value, the main pipeline 801 switches to the second type of nitrogen generator, and the nitrogen output from the second type of nitrogen generator is transported to the airtight spaces 811, 821, and 831 to continue reducing oxygen, until the oxygen content in all airtight spaces drops below the second preset value.
[0062] Figure 9 This is a schematic diagram of a multi-branch, multi-airtight space insecticidal scenario according to an embodiment of this application. Figure 9 As shown, the airtight space is divided into three groups, each group containing three airtight spaces. The main pipeline 901 branches into three branches 910, 920, and 930, which are airtightly connected to the first airtight spaces 911, 921, and 931, respectively. Valves are installed on each pipeline. Adjacent airtight spaces within each group are airtightly connected via valves. When filling multiple airtight spaces with nitrogen to reduce oxygen and kill insects, firstly, the valves between adjacent airtight spaces in each group are opened, connecting the multiple airtight spaces in each group in series. The nitrogen output from the first type of nitrogen generator is then transported through the main pipeline 901 and branches 910, 920, and 930 to the first airtight spaces 911, 921, and 931, respectively. The nitrogen in the first airtight space 911 then passes through airtight spaces 912 and 913 before being released into the atmosphere. The nitrogen in the first airtight space 921... The gas will pass through airtight spaces 922 and 923 in sequence, and finally be discharged into the atmosphere. The nitrogen in the first airtight space 931 will pass through airtight spaces 932 and 933 in sequence, and finally be discharged into the atmosphere. When the oxygen content of the target airtight space in all three groups of airtight spaces is lower than the first preset value, the system will switch to the second type of nitrogen generator on the main road 901. The nitrogen output from the second type of nitrogen generator will be delivered to each group of airtight spaces to continue reducing oxygen until the oxygen content of all airtight spaces is reduced to below the second preset value.
[0063] Figure 10 This is a schematic diagram of an insecticidal scenario in a matrix-type airtight space according to an embodiment of this application. Figure 10As shown, the airtight spaces are arranged in a 3x3 matrix. Adjacent airtight spaces in each row and column are airtightly connected via valves. Those skilled in the art should understand that the matrix airtight space is not limited to 3x3; matrix airtight spaces with up to 5x5 columns can all undergo nitrogen filling and oxygen reduction operations in a single operation, and can be freely modified according to the actual application scenario. The first type of nitrogen generator is airtightly connected to the first row and first column of airtight spaces via the first branch of the gas regulating station; the second type of nitrogen generator is airtightly connected to the first row and first column of airtight spaces via the second branch of the gas regulating station. The steps for pest control in the matrix airtight space using the low-oxygen controlled-flow pest control system include:
[0064] The control unit opens multiple valves between adjacent airtight spaces in each column of the control matrix, while closing other valves in the matrix. It also opens multiple outlets of the first branch with the valves between airtight spaces 101, 201, and 301, allowing the first type of nitrogen generator to introduce nitrogen into airtight spaces 101, 201, and 301. The nitrogen in airtight space 101 passes through airtight spaces 102 and 103 in sequence, and is finally discharged into the atmosphere. Similarly, the nitrogen in airtight space 201 passes through airtight spaces 202 and 203 in sequence, and is finally discharged into the atmosphere. Likewise, the nitrogen in airtight space 301 passes through airtight spaces 302 and 303 in sequence, and is finally discharged into the atmosphere.
[0065] After the oxygen content in airtight spaces 101, 201, and 301 is lower than the first preset threshold and after a first time interval, multiple valves between adjacent airtight spaces in each row are opened, while other valves in the matrix are closed. The valve between the outlet of the second branch and airtight space 101 is opened, allowing the second type of nitrogen generator to introduce nitrogen into airtight space 101. The nitrogen in airtight space 101 will pass through airtight space 201 and airtight space 301 in sequence, and finally be discharged into the atmosphere.
[0066] The valves between the multiple outlets of the first branch and the airtight spaces 102 and 103 are opened, so that the first type of nitrogen generator introduces nitrogen into the airtight spaces 102 and 103 respectively. The nitrogen in the airtight space 102 will pass through the airtight spaces 202 and 302 in sequence, and finally be discharged into the atmosphere. The nitrogen in the airtight space 103 will pass through the airtight spaces 203 and 303 in sequence, and finally be discharged into the atmosphere.
[0067] When the oxygen content in the target airtight space in any row is lower than the first preset threshold and after a first time interval, the valve between the outlet of the second branch and the airtight space in the first column of that row is opened, so that the second type of nitrogen generator introduces nitrogen into the airtight space in the first column of that row; and when the oxygen content in all airtight spaces in each row is lower than the second preset threshold and after a second time interval, all valves in the system are closed.
[0068] This application arranges multiple airtight spaces in a matrix, connecting adjacent airtight spaces in each row and column using valves. This allows for flexible changes in the relationship between adjacent airtight spaces, such as series or parallel connections. During nitrogen filling and deoxygenation, when different nitrogen generating devices are available in the airtight spaces, the switching occurs immediately without wasting nitrogen filling time. This is particularly suitable for large-scale airtight space nitrogen filling and deoxygenation applications, shortening the nitrogen filling and deoxygenation time and improving insecticidal efficiency.
[0069] To investigate the insecticidal time of the low-oxygen controlled insecticidal system, this application designed a comparative experiment, details of which are provided below.
[0070] Objective: To investigate the life cycle of tobacco beetles in hypoxic environments.
[0071] The test setup is shown in Table 1 below:
[0072]
[0073] The operation steps are as follows:
[0074] 1. Making the membrane cover
[0075] First, the experimental stack was measured, and the membrane cover was made according to the size of the stack. We used a high-barrier membrane, which can effectively block the exchange of air and moisture between the inside and outside, ensuring the stability of the experiment.
[0076] 2. Laying the base film
[0077] The experimental stack area was cleaned to prevent gravel from damaging the membrane cover; a layer of cardboard boxes was laid at the bottom of the membrane cover, followed by the membrane cover, then another layer of cardboard boxes and pallets, and finally the tobacco flakes were placed; ensure that the curing process is not affected by ground moisture and geothermal heat.
[0078] 3. Inspection of tobacco leaves
[0079] Sampling inspections were conducted on the experimental tobacco to ensure that it was free from pests and mold.
[0080] 4. Sampling and placement of insect sources and monitoring equipment before the experiment
[0081] Before the experiment, the five-point method was used to sample the tobacco leaves, with each sample weighing 500g. Insect sources and monitoring equipment were placed at a thickness of 20cm in the tobacco leaves to ensure the accuracy of the experiment. Insect sources were placed in the first, second, and third layers at the center of the tobacco stack.
[0082] 5. Palletizing
[0083] After the bottom film is laid, the experimental tobacco sheets are stacked. During the stacking process, care should be taken to prevent damage to the bottom film.
[0084] 6. Sealing the stack
[0085] Seal the stacked units that have already been stacked, taking care not to miss any or leave them incompletely sealed during the sealing process.
[0086] 7. Nitrogen generator is filled with nitrogen.
[0087] The sealed stacks are then purged with nitrogen. Initially, 95% pure nitrogen is used, followed by a single exchange, and then 99.5% high-purity nitrogen is used. Throughout the purging process, the oxygen concentration inside the stacks and the container is constantly monitored.
[0088] 8. Place oxygen absorber and desiccant.
[0089] After treating the oxygen content to below 0.5% with 99.5% high-concentration nitrogen, add appropriate amounts of deoxidizer and desiccant, and then treat the stacking area accordingly.
[0090] 9. Regularly monitor and test experimental parameters.
[0091] 10. Trial dismantling and on-site acceptance
[0092] After the experiment, the experimental setup was dismantled, and observation of the setup and control samples revealed no live insects. The insect source samples and tobacco samples were cultured and tested for their bioassays by professionals.
[0093] The pest mortality situation is shown in Table 2 below:
[0094]
[0095] Experimental conclusions
[0096] As shown in Table 2 above, under hypoxic conditions with an oxygen content below 0.5%, after 10 days of insecticide treatment, the adult mortality rate was 100%, the larval mortality rates were 80%, 90%, and 100%, and the egg hatching rates were 0%, 10%, and 10%, respectively; after 15 days of insecticide treatment, the adult mortality rate was 100%, the larval mortality rates were 90%, 100%, and 100%, and the egg hatching rate was 0; after 20 days of insecticide treatment, the adult mortality rate was 100%, the larval mortality rate was 100%, and the egg hatching rate was 0. Therefore, under hypoxic conditions with an oxygen content below 0.5% for 15-20 days, the adult mortality rate is 100%, the larval mortality rate is 90%, and the egg hatching rate is 0.
[0097] The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the scope of the invention. Therefore, all equivalent technical solutions should also fall within the scope of the invention.
Claims
1. A control method for a low-oxygen controlled insecticidal system, characterized in that, The method is based on a low-oxygen controlled-flow insecticidal system, which includes: a first type of nitrogen generator, a second type of nitrogen generator, a gas regulating station, multiple airtight spaces arranged in a matrix, and a control unit; wherein adjacent airtight spaces in each row and column of the matrix are airtightly connected by valves, and each pipeline is equipped with a valve; the gas regulating station includes: a first branch, a second branch, and multiple valves; the first type of nitrogen generator is airtightly connected to the multiple airtight spaces in the first row and first column via the first branch, and the first type of nitrogen generator includes a membrane nitrogen generator; the second type of nitrogen generator is airtightly connected to the multiple airtight spaces in the first row and first column via the second branch, and the second type of nitrogen generator includes a molecular sieve nitrogen generator; the control method of the low-oxygen controlled-flow insecticidal system includes: The control unit controls the opening of multiple valves between adjacent airtight spaces in each column and the closing of other valves, and controls the opening of one or more outlets of the first branch with the valves between the first airtight spaces in multiple columns, so that the first type of nitrogen generator introduces nitrogen into the multiple airtight spaces in each column. When the oxygen content in the first row of airtight spaces in each column is lower than the first preset threshold and after a first time interval, the valve between adjacent airtight spaces in each row is opened, and other valves in the matrix are closed. The valves between the multiple outlets of the first branch and the first airtight space in the non-first row are opened, so that the first type of nitrogen generator can introduce nitrogen into the multiple airtight spaces in the non-first row. When the oxygen content in the target airtight space in any row is lower than the first preset threshold and after a first time interval, the valve between the outlet of the second branch and the airtight space in the first column of that row is opened, so that the second type of nitrogen generator introduces nitrogen into the airtight space in the first column of that row. After the oxygen content in all airtight spaces in each row is lower than the second preset threshold and after a second time interval, all valves are closed.
2. The method according to claim 1, characterized in that, in, The first preset threshold is 1%-5%; the second preset threshold is 0.1%-0.5%.
3. The method according to claim 1, characterized in that, in, The values for both the first duration and the second duration are in the range of 20-60 minutes.
4. The method according to claim 1, characterized in that, Also includes: When the oxygen content in the airtight space is lower than the second preset threshold, higher purity nitrogen is used to reduce oxygen or a combination of active and passive methods is adopted to reduce oxygen.
5. The method according to claim 1, characterized in that, in, The highest nitrogen purity output by the second type of nitrogen generator is higher than that output by the first type of nitrogen generator. The first type of nitrogen generator and the second type of nitrogen generator do not simultaneously fill the same row or column of airtight space with nitrogen to reduce oxygen.
6. The method according to claim 1, characterized in that, in, The target airtight space is the airtight space with the largest volume in each row or column.
7. The method according to claim 1, characterized in that, The time required to reduce and stabilize the oxygen content in multiple airtight spaces to a second preset threshold is 1-96 hours; the insecticidal cycle of the low-oxygen controlled insecticidal system is 5-20 days.
8. The method according to claim 1, characterized in that, The nitrogen output from the membrane nitrogen generator has a purity of 95% to 99%.
9. The method according to claim 1, characterized in that, The nitrogen output from the molecular sieve nitrogen generator has a purity of 98% to 99.9%.