Roadway type tobacco leaf storage system and controlled atmosphere mould-proof process

Abstract

The invention discloses a roadway type tobacco leaf storage system and a controlled atmosphere mould-proof process, the system comprises roadway type sealed storage banks, detection modules, a PLC (programmable logic controller) and a gas regulation and control unit, a plurality of roadway type sealed storage banks are arranged in the warehouse, each roadway type sealed storage bank is internally provided with one detection module, and the PLC is connected with the gas regulation and control unit. An air inlet pipe and an exhaust pipe are arranged on the roadway type sealed storage warehouse; the gas regulation and control unit comprises a nitrogen making machine, a gas injection module and a gas exhaust module, the nitrogen making machine, the gas injection module and the gas inlet pipe are sequentially connected so as to inject nitrogen into the roadway type sealed storage warehouse, and the gas exhaust pipe is connected with the gas exhaust module so as to exhaust gas in the roadway type sealed storage warehouse. The nitrogen making machine and the detection module are electrically connected with the PLC respectively; according to the method, a low-oxygen environment is constructed through roadway sealing, growth of aerobic mycete is inhibited, and early intervention of mildew and loss control are achieved through flexible and configurable process control parameters.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of storage, in particular to a roadway type tobacco storage system and a modified atmosphere mold prevention process. BACKGROUND

[0002] Tobacco is prone to mold contamination during storage, and the main mold species such as Aspergillus and Penicillium are aerobic molds that rapidly reproduce under suitable temperature and humidity, leading to moldy tobacco and economic losses. Traditional mold prevention methods mainly rely on chemical agents or ventilation and dehumidification, but chemical agents may remain and affect the quality of tobacco, and ventilation and dehumidification have limited effect and cannot respond to mold growth in a timely manner. Although existing modified atmosphere technology can inhibit mold growth by adjusting gas composition, it is mainly suitable for overall warehouse environment and lacks a roadway sealing design for dense shelf storage, and the process parameters are fixed, which cannot intervene in the early stage of mold growth and control losses. Therefore, there is an urgent need for a configurable and efficient tobacco storage system and a modified atmosphere mold prevention process that can be quickly started when mold is found to delay the mold growth process and gain time for tobacco processing and production. SUMMARY

[0003] The present application aims to provide a roadway type tobacco storage system and a modified atmosphere mold prevention process, which builds a low-oxygen environment through roadway sealing to inhibit the growth of aerobic molds, and realizes early intervention and loss control in the early stage of mold growth through flexible and configurable process control parameters.

[0004] To solve the above technical problems, the present application adopts the following technical scheme:

[0005] A roadway type tobacco storage system, comprising a roadway type sealed storage library, a detection module, a PLC controller and a gas control unit, a plurality of roadway type sealed storage libraries are arranged in the warehouse, a detection module is arranged in each roadway type sealed storage library, and an air inlet pipe and an air outlet pipe are arranged on the roadway type sealed storage library;

[0006] The gas control unit comprises a nitrogen generator, a gas injection module and a gas discharge module, the nitrogen generator, the gas injection module and the air inlet pipe are connected in sequence to inject nitrogen into the roadway type sealed storage library, and the air outlet pipe is connected with the gas discharge module to discharge the gas in the roadway type sealed storage library, and the nitrogen generator and the detection module are electrically connected with the PLC controller;

[0007] Further, the detection module comprises an oxygen sensor, a temperature sensor and a humidity sensor.

[0008] Further, the gas injection module and the gas discharge module have the same structure and both comprise a gas storage tank, a vacuum pump and an electric ball valve connected in sequence on the pipeline, wherein the vacuum pump and the electric ball valve are electrically connected with the PLC controller.

[0009] In another aspect, the present application provides a tunnel type tobacco gas conditioning mold prevention process, characterized in that it comprises the following steps:

[0010] S1, build a tunnel type sealed storage, seal the tunnel structure of the dense shelf to form a tunnel type sealed storage, each tunnel type sealed storage as a closed gas conditioning unit, and carry out air tightness detection on the closed gas conditioning unit;

[0011] S2, configure a detection module for each closed gas conditioning unit, connect the closed gas conditioning unit with the gas conditioning unit, inject inert gas into the closed gas conditioning unit, and discharge air at the same time, so that the oxygen concentration is quickly reduced to the initial set value;

[0012] S3, real-time monitoring of oxygen concentration, temperature and humidity in the closed gas conditioning unit by the detection module, and dynamic adjustment of gas injection and discharge based on the control algorithm, maintaining the oxygen concentration in the target range, while monitoring the mold index;

[0013] S4, mold monitoring process, when the mold monitoring index meets the mold condition or mold is found manually, trigger the mold treatment sub-process, and automatically adjust the process parameters to strengthen the mold prevention effect in the mold treatment sub-process;

[0014] S5, termination stage, when the tobacco needs to be discharged or the mold risk is removed, gradually restore the oxygen concentration to the atmospheric level.

[0015] Further, in step S2, the oxygen concentration is quickly reduced to the initial set value, wherein the initial set value is 2%.

[0016] Further, in step S3, the gas injection and discharge are dynamically adjusted based on the control algorithm, which comprises the following steps:

[0017] S31, parameter initialization, according to user configuration, the following key parameters are set:

[0018] target oxygen concentration range - ;

[0019] PID parameters: 、 and ;

[0020] mold trigger time threshold ;

[0021] gas injection / discharge flow: ;

[0022] S32, real-time monitoring, the detection module collects data every certain time, including oxygen concentration , temperature and humidity ;

[0023] S33, a PID control cycle is calculated to calculate the oxygen concentration error and the PID control amount, so as to control the opening degree of the electric ball valve in the gas injection module and the gas exhaust module to control the inert gas flow.

[0024] Further, in step S33, the oxygen concentration error and the PID control amount are calculated, wherein the calculation formula of the oxygen concentration error is:

[0025]

[0026] In the formula, is the current oxygen target concentration value, is the real-time monitored oxygen concentration value, is the oxygen concentration error value;

[0027] The calculation formula of the PID control amount is:

[0028]

[0029] In the formula, , and PID three parameters set, the values of which are set according to different tobacco types, is the PID control amount.

[0030] Further, in step S4, when the moldy index meets the moldy condition or the moldy is found manually, the moldy adjustment processing sub-process is triggered, wherein the moldy index is reflected by comparing the size and duration of the oxygen concentration , the maximum value of the target oxygen concentration range ; the moldy condition is: and the duration of the process is greater than .

[0031] Further, in step S4, when the moldy adjustment processing sub-process is triggered, the system automatically adjusts the current oxygen target concentration value , and increases the monitoring frequency of the detection module.

[0032] Further, it further comprises: S6, adaptive adjustment, using a long short-term memory network LSTM to train historical operation data, learning the complex nonlinear relationship between gas diffusion, temperature and humidity transmission and equipment response, and rolling outputting optimal control instructions to the gas regulation unit.

[0033] Compared with the prior art, the beneficial effects of the present application are:

[0034] 1. The present application sets up a lane type sealed storage library in the warehouse to form independent closed modified atmosphere units, and each closed modified atmosphere unit is independently controlled, so that the mold prevention needs of different types of tobacco leaves can be controlled individually, and compared with the existing overall warehouse modification, the technical scheme adopted by the present application is more flexible and has better adaptability.

[0035] 2. The mold prevention method of the present application mainly inhibits aerobic mold by constructing a low-oxygen environment, and the mold prevention effect is remarkable, and the use of chemical agents is reduced.

[0036] 3. In the present application, process control parameters such as target oxygen concentration and PID parameters can be flexibly adjusted according to the type of tobacco leaves and storage conditions, and the adaptability is strong, and the quality risk caused by "one size fits all" is avoided.

[0037] 4. In the present application, mold can be monitored, and when mold indicators are detected or mold is found manually, mold treatment sub-process will be triggered, and process parameters will be automatically adjusted to strengthen mold prevention effect in the process, early intervention of mold is realized, mold escalation is delayed, and loss is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 The lane type tobacco storage system structure diagram described in the present application.

[0039] Figure 2 A structure diagram of the lane type sealed storage library.

[0040] Figure 3 The lane type tobacco modification mold prevention process flow diagram described in the present application.

[0041] In the figure, 1 is a lane type sealed storage library, 2 is a detection module, 3 is a PLC controller, 4 is a gas injection module, 41 is a gas storage tank, 42 is an electric ball valve, 43 is a vacuum pump, 5 is a gas exhaust module, and 6 is a nitrogen generator. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] The following detailed description of the embodiments of the application in the drawings provided by the application is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.

[0044] In the description of the application, it should also be noted that unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0045] Reference Figure 1 As shown, the application provides a tunnel type tobacco storage system, which comprises a tunnel type sealed storage warehouse 1, a detection module 2, a PLC controller 3 and a gas control unit, a plurality of tunnel type sealed storage warehouses 1 are arranged in the warehouse, a detection module 2 is arranged in each tunnel type sealed storage warehouse 1, and an air inlet pipe and an air outlet pipe are arranged on the tunnel type sealed storage warehouse 1;

[0046] In some embodiments, the tunnel type sealed storage warehouse 1 is built based on a multi-layer beam type shelf, a flexible sealing material (such as a sealing curtain) is used to cover the tunnel entrance and the top in the tunnel of the multi-layer beam type shelf, or double-layer insulation steel plates can also be used for covering, in addition, as shown in the figure, a box structure can also be directly arranged on the multi-layer beam type shelf, of course, the application does not limit this, Figure 2 As shown, a box structure can also be directly arranged on the multi-layer beam type shelf, of course, the application does not limit this,

[0047] In order to detect the oxygen concentration and the temperature and humidity in the tunnel type sealed storage warehouse 1, the detection module 2 comprises an oxygen sensor, a temperature sensor and a humidity sensor;

[0048] The gas control unit comprises a nitrogen generator 6, a gas injection module 4 and a gas discharge module 5, the nitrogen generator 6, the gas injection module 4 and the air inlet pipe are connected in sequence to inject nitrogen into the tunnel type sealed storage warehouse 1, the air outlet pipe is connected with the gas discharge module 5 to discharge the gas in the tunnel type sealed storage warehouse 1, and the nitrogen generator 6 and the detection module 2 are respectively electrically connected with the PLC controller 3, so that the oxygen concentration and the temperature and humidity can be fed back to the PLC controller 3 and the nitrogen generator 6 is controlled by the PLC controller 3;

[0049] Specifically, the gas injection module 4 and the gas exhaust module 5 are structurally identical, and each includes a gas storage tank 41, a vacuum pump 43 and an electric ball valve 42 connected in sequence on a pipeline, wherein the vacuum pump 43 and the electric ball valve 42 are electrically connected with the PLC controller 3, so as to control the vacuum pump 43 and the electric ball valve 42 through the PLC controller 3.

[0050] On the other hand, referring to Figure 3 Based on the above-mentioned lane type tobacco storage system, the present application also provides a lane type tobacco modified atmosphere mold-proof process, comprising the following steps:

[0051] S1, building a lane type sealed storage library, sealing the lane structure of the dense shelf to form a lane type sealed storage library, each lane type sealed storage library as a closed atmosphere unit, and the closed atmosphere unit is subjected to air tightness detection to ensure that the leakage rate is lower than the standard value 0.5 vol% / h;

[0052] S2, a detection module is configured for each closed atmosphere unit, and the closed atmosphere unit is connected with a gas control unit, inert gas is injected into the closed atmosphere unit, and air is exhausted at the same time, so that the oxygen concentration is rapidly reduced to the initial set value;

[0053] Preferably, the initial set value is 2%, by injecting inert gas into the closed atmosphere unit to exhaust oxygen, reducing the oxygen concentration in the closed atmosphere unit, and directly inhibiting aerobic mold by building a low-oxygen environment, thereby achieving the effect of mold-proof.

[0054] S3, the oxygen concentration, temperature and humidity in the closed atmosphere unit are monitored in real time by the detection module, and the gas injection and exhaust are dynamically adjusted based on the control algorithm to maintain the oxygen concentration in the target range, while the mold index is monitored;

[0055] The gas injection and exhaust are dynamically adjusted based on the control algorithm, which comprises the following steps:

[0056] S31, parameter initialization, according to user configuration, the following key parameters are set:

[0057] Target oxygen concentration range - ;

[0058] PID parameters: 、 and ;

[0059] Mold trigger time threshold ;

[0060] Gas injection / exhaust flow: ;

[0061] The gas control algorithm focuses on maintaining a low-oxygen environment, achieving precise management of oxygen concentration through closed-loop control. The process control parameters are flexible and configurable; users can input tobacco leaf type (e.g., imported, domestic, stem, reconstituted tobacco) and environmental conditions via the control interface. The system automatically calls preset parameter ranges or allows custom settings. This personalized configuration enhances the storage adaptability of different types of tobacco leaves, avoiding the quality risks associated with a "one-size-fits-all" approach.

[0062] S32. Real-time monitoring: Data, including oxygen concentration, is collected at regular intervals by the detection module. ,temperature and humidity ;

[0063] S33, PID control loop, calculates oxygen concentration error and PID control quantity, thereby controlling the opening degree of electric ball valve in gas injection module and gas discharge module to control inert gas flow.

[0064] The formula for calculating the oxygen concentration error is as follows:

[0065] ;

[0066] In the formula, This represents the current target oxygen concentration. This refers to the real-time oxygen concentration value. This is the oxygen concentration error value;

[0067] The formula for calculating the PID control quantity is:

[0068]

[0069] In the formula, , and The three parameters for the PID are set, and their values ​​are adjusted according to different tobacco leaf types. For PID control input, based on This is used to control the opening degree of the electric ball valve, thereby controlling the flow rate of inert gas.

[0070] S4. Mold monitoring and treatment: When the monitored mold index meets the mold condition or mold is manually detected, the mold treatment sub-process is triggered. In the mold treatment sub-process, the process parameters are automatically adjusted to enhance the mold prevention effect.

[0071] In this process, the mold index is determined by comparing oxygen concentration. Maximum value of the target oxygen concentration range The size and duration of the mold growth are used to reflect the condition; the mold growth conditions are: And the duration of this process is greater than That is, when the monitored oxygen concentration is greater than the maximum value of the target oxygen concentration range and continues for more than a preset value, it is determined that the mold index is reached, and the mold treatment sub-process is triggered, the system automatically reduces the current oxygen target concentration value , so that From the original 2 to , and increase the monitoring frequency of the detection module.

[0072] S5, termination phase, when the tobacco needs to be out of the warehouse or the mold risk is removed, gradually restore the oxygen concentration to atmospheric level.

[0073] In addition, the tunnel type tobacco gas conditioning mold prevention process also includes: S6, adaptive adjustment, using long short-term memory network LSTM to train historical operation data, learning the complex nonlinear relationship between gas diffusion, temperature and humidity transmission and equipment response, and rolling output optimal control instruction to the gas regulation unit.

[0074] The input of LSTM is the control instruction (nitrogen flow, valve opening) and the environment state (i.e. temperature and humidity and oxygen) of the past N time steps, and the output is the state prediction value of each sensor point in the future M time steps. Preferably, the LSTM prediction is fused and corrected with the CFD model based on physical rules to improve the prediction accuracy and generalization ability.

[0075] Although the present application has been described herein with reference to the various illustrative embodiments thereof, it is understood that various other modifications and implementations can be devised by those skilled in the art, which will fall within the principles and spirit of the present application. More specifically, many variations and modifications of the subject combination arrangement, as well as the components thereof, can be made within the scope and spirit of the present application. In addition to those variations and modifications which have been described, other uses will become apparent to those skilled in the art.

Claims

1. A lane-type tobacco storage system, characterized by: The warehouse comprises a lane type sealed storage repository (1), a detection module (2), a PLC controller (3) and a gas regulation unit, a plurality of lane type sealed storage repositories (1) are arranged in the warehouse, a detection module (2) is arranged in each lane type sealed storage repository (1), and an air inlet pipe and an air outlet pipe are arranged on the lane type sealed storage repository (1); The gas regulation unit comprises a nitrogen generator (6), a gas injection module (4) and a gas discharge module (5), the nitrogen generator (6), the gas injection module (4) and the air inlet pipe are sequentially connected to inject nitrogen into the lane type sealed storage repository (1), and the air outlet pipe is connected with the gas discharge module (5) to discharge the gas in the lane type sealed storage repository (1), and the nitrogen generator (6) and the detection module (2) are electrically connected with the PLC controller (3) respectively.

2. A lane-type tobacco storage system according to claim 1, characterized in that: The detection module (2) comprises an oxygen sensor, a temperature sensor and a humidity sensor.

3. A lane-type tobacco storage system according to claim 1, characterized in that: The gas injection module (4) and the gas discharge module (5) have the same structure and each comprise a gas storage tank (41), a vacuum pump (43) and an electric ball valve (42) which are sequentially connected on a pipeline, wherein the vacuum pump (43) and the electric ball valve (42) are electrically connected with the PLC controller (3) respectively.

4. A process for the controlled atmosphere mold prevention of tobacco in a tunnel, characterized in that, The method comprises the following steps: S1, a lane type sealed storage repository is built, the lane structure of the dense type shelf is sealed to form a lane type sealed storage repository, each lane type sealed storage repository serves as a closed air conditioning unit, and the closed air conditioning unit is subjected to air tightness detection; S2, a detection module is separately configured for each closed air conditioning unit, the closed air conditioning unit is connected with a gas regulation unit, inert gas is injected into the closed air conditioning unit, and air is discharged at the same time, so that the oxygen concentration is rapidly reduced to an initial set value; S3, the oxygen concentration, temperature and humidity in the closed air conditioning unit are monitored in real time through the detection module, and the gas injection and discharge are dynamically adjusted based on a regulation algorithm to maintain the oxygen concentration in a target range, and a mildew index is monitored; S4, mildew monitoring processing, when the monitored mildew index meets the mildew condition or the mildew is found by manual detection, a mildew treatment sub-process is triggered, and the process parameters are automatically adjusted to strengthen the mildew prevention effect in the mildew treatment sub-process; S5, a termination stage, when the tobacco needs to be discharged or the mildew risk is removed, the oxygen concentration is gradually restored to the atmospheric level.

5. A process for the controlled atmosphere mold prevention of tobacco in a tunnel according to claim 4 wherein: In step S2, the oxygen concentration is rapidly reduced to an initial set value, and the initial set value is 2%.

6. A process for the controlled atmosphere mold prevention of tobacco in a tunnel according to claim 4 wherein: In step S3, the gas injection and discharge are dynamically adjusted based on the regulation algorithm, and the method comprises the following steps: S31, parameter initialization, according to user configuration, the following key parameters are set: Target oxygen concentration range ​​ PID parameters: , and ; Mold trigger time threshold ; Gas injection / vent flow rate: ; S32, real-time monitoring, collecting data by detection module every certain time, including oxygen concentration , temperature and humidity ; S33, PID control cycle, the oxygen concentration error and the PID control amount are calculated to control the opening degree of the electric ball valve in the gas injection module and the gas discharge module to control the inert gas flow.

7. A process for the controlled atmosphere mold prevention of tobacco in a tunnel according to claim 6 wherein: In step S33, the oxygen concentration error and the PID control amount are calculated, wherein the calculation formula of the oxygen concentration error is: ； In the formula, is a current oxygen target concentration value, is a real-time monitored oxygen concentration value, is an oxygen concentration error value; The calculation formula of the PID control amount is: ； In the formula, , and PID three parameters set, the value is set according to different tobacco types, PID control amount.

8. A process for the controlled atmosphere mold prevention of tobacco in a tunnel according to claim 4 wherein: In step S4, when the moldy index meets the moldy condition or mold is found manually, a moldy treatment sub-process is triggered, wherein the moldy index is reflected by comparing the size and duration of the oxygen concentration , the maximum value of the target oxygen concentration range ; the moldy condition is: , and the duration of the process is greater than .

9. A process for the controlled atmosphere mold prevention of tobacco in a tunnel according to claim 4 wherein: In step S4, when the mold change processing sub-process is triggered, the system automatically reduces the current oxygen target concentration value and increases the monitoring frequency of the detection module.

10. A process for the controlled atmosphere mold prevention of tobacco in a tunnel according to claim 4 wherein: Further comprising: S6, adaptive adjustment, using long short-term memory network LSTM to train the historical operation data, learning the complex nonlinear relationship between gas diffusion, temperature and humidity transmission and equipment response, so as to roll out the optimal control instruction to the gas regulation unit.

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