Method, apparatus and medium for rehydrating expanded cut tobacco

Abstract

This disclosure relates to a method, apparatus, and medium for rehydrating expanded tobacco shreds. The method includes: calculating the total water flow rate of the tobacco shreds based on the index moisture content before rehydration, the index moisture content after rehydration, the index flow rate of the tobacco shreds, and the actual water addition efficiency coefficient; obtaining preset water addition flow rates for the first zone, the second zone, and the third zone according to the actual water addition capacity and the principle of allocating the total water addition flow rate of the tobacco shreds proportionally within the first and second zones; monitoring the actual water addition flow rates of the first, second, and third zones, as well as the actual moisture content after rehydration; adjusting the opening degree; calculating the difference between the actual moisture content after rehydration and the index moisture content after rehydration, and adjusting the preset water addition flow rate of the third zone based on the calculation result. This disclosure can accurately and stably control the moisture content of the rehydrated tobacco shreds at the outlet of the rehydration machine.

Description

Technical Field

[0001] This disclosure relates to the field of tobacco rehydration technology, and in particular to a method, apparatus and medium for rehydrating expanded tobacco. Background Technology

[0002] The RC80 rehumidification device is used to cool and rehumidify expanded tobacco shreds that have undergone sublimation treatment, restoring them to the required moisture content to meet the requirements for tobacco storage and blending. Since the final moisture content and quality of the finished expanded tobacco shreds are determined by the RC80 rehumidification device, this step is crucial. The existing RC80 rehumidification water supply system has three water supply channels, employing a zone-based, non-interlocking automatic control method. That is, the water supply setpoints for zones one and two remain constant, accounting for a larger proportion of the total water supply, while the water supply proportion for zone three is relatively smaller. The water supply parameters are adjusted based on feedback from the RC80 rehumidification outlet moisture content, forming a closed-loop control to ultimately keep the RC80 rehumidification outlet moisture content within acceptable limits. However, this water supply system suffers from defects such as unreasonable allocation of water supply parameters between zones, lack of parameter linkage between zones, and inability to self-optimize and adjust the overall water supply control in the event of an anomaly. This leads to unstable RC80 rehumidification outlet moisture control, affecting the quality of the tobacco shreds.

[0003] Chinese patent document CN115844047A discloses a technology entitled "A Method and System for Controlling the Outlet Moisture of a Rehumidifier". This technology adopts the concept of distributed water supply control and is a distributed moisture control process consisting of a double open-loop water supply system and a single closed-loop water supply system. Although it achieves linkage of water supply parameters between zones one and two and zone three, if the water supply flow rate in zone three exceeds the range or no water is supplied, only the water supply task ratio parameter in zone two is adjusted, but the parameter in zone one does not change. There are no corresponding optimization and adjustment measures when water supply in zones one and two is abnormal, and the water supply parameters in zones one and two are not re-optimized according to the actual performance of the equipment. Therefore, it still has the defects of low anti-interference and unreasonable water supply distribution. Summary of the Invention

[0004] This disclosure proposes a method, apparatus, and medium for rehydrating expanded tobacco, which solves the problems of unreasonable water addition parameter distribution in each zone, lack of parameter linkage between zones, and inability of overall water addition control to self-optimize and adjust when abnormalities occur during the rehydration and water addition of expanded tobacco.

[0005] According to a first aspect of this disclosure, a method for rehydrating expanded tobacco shreds is provided, comprising: acquiring index moisture content before rehydration, index moisture content after rehydration, index flow rate of the tobacco shreds, and actual water addition efficiency coefficient; calculating the total water addition flow rate of the tobacco shreds based on the index moisture content before rehydration, the index moisture content after rehydration, the index flow rate of the tobacco shreds, and the actual water addition efficiency coefficient; obtaining preset water addition flow rates for the first zone, the second zone, and the third zone based on the actual water addition capacity of the first zone water addition pipeline system, the second zone water addition pipeline system, and the third zone water addition pipeline system, and distributing the total water addition flow rate of the tobacco shreds according to the principle of fixing the total water addition amount in the first zone and the total water addition amount in the second zone and distributing it internally according to a proportional distribution; and monitoring the water addition in the first zone. The actual flow rate, the actual flow rate of water added in the second zone, the actual flow rate of water added in the third zone, and the actual moisture content after rehydration are measured. The actual flow rates of water added in the first zone and the second zone are compared with the preset flow rates of water added in the first zone and the second zone, respectively. Based on the comparison results, the opening of the pneumatic diaphragm regulating valves in the first and second zones is adjusted. The actual flow rate of water added in the third zone is compared with the preset flow rate of water added in the third zone. Based on the comparison results, the opening of the pneumatic diaphragm regulating valve in the third zone is adjusted. The difference between the actual moisture content after rehydration and the index moisture content after rehydration is calculated. Based on the calculation results, the preset flow rate of water added in the third zone is adjusted to achieve normal rehydration of the expanded tobacco.

[0006] In some embodiments, after adjusting the preset flow rate of water added to the third zone based on the calculation results, the method further includes: detecting that the difference between the preset flow rate of water added to the first zone and the actual flow rate of water added to the first zone is greater than or equal to a flow threshold; or the difference between the preset flow rate of water added to the second zone and the actual flow rate of water added to the second zone is greater than or equal to a flow threshold, keeping the preset flow rate of water added to the third zone unchanged and increasing the preset flow rate of water added to the second zone; or keeping the preset flow rate of water added to the third zone unchanged and increasing the preset flow rate of water added to the first zone.

[0007] In some embodiments, after adjusting the preset water flow rate of the third zone based on the calculation results, the method further includes: when it is detected that the actual moisture content after rehydration is different from the index moisture content after rehydration and the difference between the two exceeds a preset threshold, and the duration exceeds T, disconnecting the negative feedback of the actual moisture content after rehydration on the adjustment of the preset water flow rate of the third zone, and keeping the opening of the pneumatic diaphragm regulating valve of the third zone unchanged; calculating an output value based on the difference between the actual moisture content after rehydration and the preset moisture content after rehydration, and multiplying the output value by a water addition correction factor to obtain the water addition adjustment amount; adding the preset water flow rate of the first zone, the preset water flow rate of the second zone, and the water addition adjustment amount to obtain the preset total water addition amount; and redistributing the preset total water addition amount proportionally to the preset water flow rate of the first zone and the preset water flow rate of the second zone.

[0008] According to a second aspect of this disclosure, an expanded tobacco rehydration device is provided, comprising: an acquisition module for acquiring index moisture content before rehydration, index moisture content after rehydration, index flow rate of tobacco, and actual water addition efficiency coefficient; a calculation module for calculating the total water addition flow rate of tobacco based on the index moisture content before rehydration, the index moisture content after rehydration, the index flow rate of tobacco, and the actual water addition efficiency coefficient; an allocation module for obtaining preset water addition flow rates for the first zone, the second zone, and the third zone based on the actual water addition capacity of the first zone water addition pipeline system, the second zone water addition pipeline system, and the third zone water addition pipeline system, and allocating the total water addition flow rate of tobacco according to the principle of fixing the total water addition amount in the first zone and the total water addition amount in the second zone and allocating it internally according to a proportional distribution; and a monitoring module for monitoring the water addition in the first zone. The system includes: actual flow rate, actual flow rate of water added in the second zone, actual flow rate of water added in the third zone, and actual moisture content after rehydration; a first adjustment module, used to compare the actual flow rates of water added in the first zone and the second zone with the preset flow rates of water added in the first zone and the second zone, respectively, and adjust the opening of the pneumatic diaphragm regulating valves in the first and second zones based on the comparison results; a second adjustment module, used to compare the actual flow rate of water added in the third zone with the preset flow rate of water added in the third zone, and adjust the opening of the pneumatic diaphragm regulating valve in the third zone based on the comparison results; and a third adjustment module, used to calculate the difference between the actual moisture content after rehydration and the index moisture content after rehydration, and adjust the preset flow rate of water added in the third zone based on the calculation results, thereby achieving normal rehydration of the expanded tobacco.

[0009] According to a third aspect of this disclosure, an expanded tobacco rehydration device is provided, comprising: a memory; and a processor coupled to the memory, the processor being configured to perform the expanded tobacco rehydration method as described above based on instructions stored in the memory.

[0010] According to a fourth aspect of this disclosure, a computer-storeable medium is provided having computer program instructions stored thereon, which, when executed by a processor, implement the expanded tobacco rehydration method as described above.

[0011] By adopting the above technical solution, the embodiments of this disclosure achieve the following beneficial technical effects: They employ a zoned linkage and parameter self-optimization control concept, consisting of a dual internal closed-loop PID water supply system and a dual-loop cascade PID water supply system. The water supply control process, with its three zones interconnected and optimized, achieves normal rehydration of expanded tobacco. This enables the optimization of water supply parameters in all three zones under normal conditions and the self-optimization of water supply parameters in each zone under abnormal conditions, precisely and stably controlling the moisture content at the RC80 outlet, thus achieving normal rehydration of the expanded tobacco. Attached Figure Description

[0012] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.

[0013] This disclosure can be more clearly understood with reference to the accompanying drawings and the following detailed description.

[0014] Figure 1 This is a flowchart illustrating a method for rehydrating expanded tobacco according to some embodiments of the present disclosure.

[0015] Figure 2 This is a schematic diagram illustrating the internal PID control of the first and second zones according to some embodiments of the present disclosure.

[0016] Figure 3 This is a schematic diagram illustrating a three-zone dual-loop cascade PID control according to some embodiments of the present disclosure.

[0017] Figure 4 This is a schematic diagram illustrating the re-optimization control of internal parameters for abnormal water addition in a zone according to some embodiments of the present disclosure.

[0018] Figure 5 This is a schematic diagram illustrating the re-optimization control of internal parameters for abnormal water addition in two zones according to some embodiments of the present disclosure.

[0019] Figure 6 This is a schematic diagram illustrating the internal partition linkage control of three-zone water supply abnormality according to some embodiments of the present disclosure.

[0020] Figure 7 This is a schematic diagram illustrating the water filling control of the RC80 rehumidification device according to some embodiments of the present disclosure.

[0021] Figure 8 This is a block diagram illustrating an expanded tobacco rehydration apparatus according to some embodiments of the present disclosure.

[0022] Figure 9 This is a block diagram illustrating an expanded tobacco rehydration apparatus according to other embodiments of the present disclosure.

[0023] Figure 10 This is a block diagram illustrating a computer system for implementing some embodiments of the present disclosure. Detailed Implementation

[0024] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0025] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0026] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0027] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0028] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0030] Currently, the RC80 rehumidification device is used to cool and rehumidify expanded tobacco shreds that have undergone sublimation treatment, restoring them to the required moisture content to meet the requirements for tobacco storage and blending. Since the final moisture content and quality of the finished expanded tobacco shreds are determined by the RC80 rehumidification device, this step is crucial. The existing RC80 rehumidification water supply system has three water supply channels, employing a zone-based, non-interlocking automatic control method. That is, the water supply setpoints for zones one and two remain constant, accounting for a larger proportion of the total water supply, while the water supply proportion for zone three is relatively smaller. The water supply parameters are adjusted based on feedback from the RC80 rehumidification outlet moisture content, forming a closed-loop control to ultimately keep the RC80 rehumidification outlet moisture content within acceptable limits. However, this water supply system suffers from defects such as unreasonable allocation of water supply parameters between zones, lack of parameter linkage between zones, and inability to self-optimize and adjust the overall water supply control in the event of an anomaly. This leads to unstable RC80 rehumidification outlet moisture control, affecting the quality of the tobacco shreds.

[0031] In view of this, this disclosure proposes a method, device, and medium for rehydrating expanded tobacco. It employs a zoned linkage and parameter self-optimization control concept. The overall system consists of a dual internal closed-loop PID water supply system and a dual-loop cascade PID water supply system, with the three zones mutually linked and optimized in a water supply control process to achieve normal rehydration of expanded tobacco. It can achieve optimized water supply parameters in all three zones under normal conditions and self-optimization of water supply parameters in each zone under abnormal conditions, accurately and stably controlling the moisture content at the RC80 outlet, thus achieving normal rehydration of expanded tobacco.

[0032] Figure 1 This is a flowchart illustrating a method for rehydrating expanded tobacco according to some embodiments of the present disclosure. For example... Figure 1 As shown, the method for rehydrating expanded tobacco includes steps 110 to 170.

[0033] In step 110, the moisture content before rehydration, the moisture content after rehydration, the tobacco flow rate, and the actual water addition efficiency coefficient are obtained.

[0034] In step 120, the total water flow rate of the tobacco is calculated based on the moisture content index before rehydration, the moisture content index after rehydration, the tobacco flow rate index, and the actual water addition efficiency coefficient.

[0035] In step 130, based on the actual water supply capacity of the first zone water supply pipeline system, the second zone water supply pipeline system, and the third zone water supply pipeline system, and according to the principle of fixing the total water supply in the first zone and the total water supply in the second zone and distributing it internally according to a ratio, the preset water supply flow rates for the first zone, the second zone, and the third zone are obtained.

[0036] In step 140, the actual flow rate of water added to the first zone, the actual flow rate of water added to the second zone, the actual flow rate of water added to the third zone, and the actual moisture content after rehydration are monitored.

[0037] In step 150, the actual water flow rate of the first zone and the actual water flow rate of the second zone are compared with the preset water flow rate of the first zone and the preset water flow rate of the second zone, respectively, and the opening degree of the pneumatic diaphragm regulating valve of the first zone and the pneumatic diaphragm regulating valve of the second zone is adjusted based on the comparison result.

[0038] In step 160, the actual flow rate of water added to the third zone is compared with the preset flow rate of water added to the third zone, and the opening degree of the pneumatic diaphragm regulating valve in the third zone is adjusted based on the comparison result.

[0039] In step 170, the difference between the actual moisture content after rehydration and the index moisture content after rehydration is calculated, and the preset flow rate of water added to the third zone is adjusted based on the calculation result to achieve normal rehydration of the expanded tobacco.

[0040] After adjusting the preset flow rate of water added to the third zone based on the calculation results, the method further includes: detecting that the difference between the preset flow rate of water added to the first zone and the actual flow rate of water added to the first zone is greater than or equal to a flow threshold; or the difference between the preset flow rate of water added to the second zone and the actual flow rate of water added to the second zone is greater than or equal to a flow threshold, keeping the preset flow rate of water added to the third zone unchanged and increasing the preset flow rate of water added to the second zone; or keeping the preset flow rate of water added to the third zone unchanged and increasing the preset flow rate of water added to the first zone.

[0041] In some embodiments, after adjusting the preset water flow rate of the third zone based on the calculation results, the method further includes: when it is detected that the actual moisture content after rehydration is different from the index moisture content after rehydration and the difference between the two exceeds a preset threshold, and the duration exceeds T, disconnecting the negative feedback of the actual moisture content after rehydration on the adjustment of the preset water flow rate of the third zone, and keeping the opening of the pneumatic diaphragm regulating valve of the third zone unchanged; calculating an output value based on the difference between the actual moisture content after rehydration and the preset moisture content after rehydration, and multiplying the output value by a water addition correction factor to obtain the water addition adjustment amount; adding the preset water flow rate of the first zone, the preset water flow rate of the second zone, and the water addition adjustment amount to obtain the preset total water addition amount; and redistributing the preset total water addition amount proportionally to the preset water flow rate of the first zone and the preset water flow rate of the second zone.

[0042] Specifically, the first step is to determine the total amount of water required per hour to pass through the RC80 rehumidification device based on the pre-rehumidification moisture value before entering the RC80 rehumidification device, the target moisture value at the RC80 outlet, the tobacco flow rate, and the actual water addition efficiency coefficient.

[0043] like Figure 7 As shown, after the expanded tobacco enters the RC80 rehumidification device, it passes through the water supply control systems of Zone 1, Zone 2 and Zone 3 respectively. The water supply systems of the three zones are physically independent.

[0044] Moisture content (WS) before rehydration 回潮前 This refers to the moisture content index value before rehydration; the RC80 export moisture target value WS 回潮后 This refers to the moisture content after rehydration; tobacco flow rate (TOBACCO_FLOW) 膨丝 These three values ​​refer to the flow rate of the belt scale before flavoring. They are all specified in the process specification document and are known. The actual water addition efficiency coefficient η is an empirical value, referring to the amount of moisture actually absorbed and retained in the tobacco after it has passed through the RC80 rehumidification device due to moisture removal, dust removal, and moisture loss during transportation. It is a constant. Based on these four parameters, we can roughly estimate the total water addition flow rate (WATER_FLOW) required by the RC80 rehumidification device at a specific production flow rate. 总体 ,Right now

[0045] WATER_FLOW 总体 ={TOBACCO_FLOW 膨丝 -[TOBACCO_FLOW 膨丝

[0046] *(1-WS 回潮后 ) / (1-WS 回潮前 )]} / η.

[0047] The second step involves determining the preset water supply capacity for each zone based on the actual water supply capacity of the water supply pipeline systems in zones one, two, and three. This preset value is then used as the preset water supply parameter for each zone, following the principle of "fixed total water supply for zones one and two, with internal allocation according to proportions".

[0048] Due to differences in the water supply pipeline systems of the three zones, the actual water supply capacity of the three zones also varies. Based on the conclusions drawn from on-site verification, the actual water supply capacity is as follows:

[0049] Zone 1: Zone 2: Zone 3 = 7:5:3;

[0050] Therefore, the water supply in zones one and two accounts for approximately 80%, while zone three accounts for 20%. Based on this actual water supply capacity, and following the principle of "fixed total water supply in zones one and two, with internal distribution according to proportions," the total water flow rate for tobacco is set to WATER_FLOW. 总体 Based on the proportional allocation, the preset values ​​for the total water flow rate in zones one and two and the preset value for the water flow rate in zone three are first obtained, namely:

[0051] The preset total water flow rate for Zones 1 and 2 is WATER_FLOW_SP = 0.8 * WATER_FLOW. 总体 ;

[0052] The preset water flow rate for the three zones is WATER_FLOW_SP3 = 0.2 * WATER_FLOW 总体 ;

[0053] The preset water flow rates for Zone 1 and Zone 2 are then proportionally allocated internally, i.e.:

[0054] The preset water flow rate for Zone 1 is WATER_FLOW_SP1 = WATER_FLOW_SP * 7 / 12;

[0055] Preset value for water flow rate in Zone 2: WATER_FLOW_SP2 = WATER_FLOW_SP * 5 / 12;

[0056] The preset water flow rates of the three zones obtained above are used as the initial preset water flow rate parameters for zones one, two, and three.

[0057] Thirdly, when the RC80 rehumidification device is working normally, the water supply in zones one and two accounts for the vast majority, while the water supply in zone three is relatively small, enabling fine-tuning control. Zones one and two supply water according to preset water supply parameters. The water supply opening is controlled by a pneumatic diaphragm regulating valve, and the water supply volume is measured by a water flow meter. The electronic control system adjusts the opening of the pneumatic diaphragm regulating valve by comparing the actual water flow value with the preset value in real time, thereby forming a dual internal PID closed-loop water supply control.

[0058] like Figure 2As shown, during normal production, the water flow meters in Zone 1 and Zone 2 measure the actual water flow rates of their respective zones in real time, WATER_FLOW_PV1 and WATER_FLOW_PV2, and feed them back to the electrical control system. The electrical control system compares the actual water flow rates WATER_FLOW_PV1 and WATER_FLOW_PV2 with the preset water flow rates WATER_FLOW_SP1 and WATER_FLOW_SP2. Finally, based on the comparison results, it controls the opening values ​​VALVE_CV1 and VALVE_CV2 of the pneumatic diaphragm regulating valves in Zones 1 and 2, forming an internal PID closed-loop control to ensure the stability and accuracy of the water flow rates in Zones 1 and 2.

[0059] Fourthly, similar to zones one and two, the electronic control system adjusts the opening of the pneumatic diaphragm regulating valve by comparing the actual water flow rate with the preset value in real time, forming an internal PID closed-loop water supply control. Based on this, the electronic control system also adjusts the preset water supply value for zone three by comparing the actual water moisture content at the RC80 outlet with the set value in real time, thereby controlling the water supply in zone three and forming an external PID closed-loop control. Under normal circumstances, the dual internal closed-loop PID water supply systems of zones one and two, together with the dual-loop cascade PID control system of zone three, can achieve precise control of the RC80 outlet water moisture content.

[0060] like Figure 3 As shown, the water flow meters in the three zones measure the actual water flow rate (WATER_FLOW_PV3) in real time and feed it back to the electronic control system. The electronic control system compares the actual water flow rate (WATER_FLOW_PV3) with the preset water flow rate (WATER_FLOW_SP3), and finally controls the opening value (VALVE_CV3) of the pneumatic diaphragm regulating valves in the three zones based on the comparison result, forming an internal PID closed-loop control to ensure the stability and accuracy of the water flow rate in the three zones. In addition, the moisture meter at the outlet of the RC80 rehumidification device measures the actual moisture content (WS) at the RC80 outlet. 回潮后 PV is fed back to the electronic control system, which then compares it with WS. 回潮后 In comparison, the PID adjusts the preset value of WATER_FLOW_SP3 for the three-zone water flow rate based on the difference between the two values, thereby realizing external PID closed-loop control.

[0061] Fifth step, when the RC80 rehumidification device malfunctions:

[0062] Scenario 1: Abnormal water supply in Zone 1 or Zone 2. Due to equipment issues such as nozzle blockage or diaphragm valve malfunction, the actual water supply in Zone 1 or Zone 2 fails to meet the preset requirements, and the diaphragm valve opening in Zone 1 or Zone 2 remains at its minimum or maximum. In this case, the preset water supply value for Zone 3 remains unchanged, and the dual-loop cascade PID control system continues to function. Based on the principle that the total water supply value for Zones 1 and 2 remains constant, the zone linkage function is activated. That is, the insufficient water supply in Zone 1 due to the abnormality is supplemented by Zone 2, or vice versa.

[0063] like Figure 4 and Figure 5 As shown, if the difference between the preset water flow rate value WATER_FLOW_SP1 and the actual water flow rate value WATER_FLOW_PV1 in Zone 1 is greater than or equal to 5 kg / h for more than 30 seconds, or the difference between the preset water flow rate value WATER_FLOW_SP2 and the actual water flow rate value WATER_FLOW_PV2 in Zone 2 is greater than or equal to 5 kg / h, then an anomaly is determined to have occurred in the water supply pipeline system of Zone 1 or Zone 2. In this case, the preset water flow rate value for Zone 3 is kept unchanged, and the dual-loop cascade PID control system remains in place. That is:

[0064] The preset water flow rate for the three zones is WATER_FLOW_SP3 = 0.2 * WATER_FLOW total.

[0065] Next, calculate the difference between the preset value and the actual value of the water addition in Zone 1, that is:

[0066] ΔDIFFERENCE_VALUE 一区 =WATER_FLOW_SP1-WATER_FLOW_PV1;

[0067] Or the difference between the preset value and the actual value of the water addition in Zone 2, i.e.:

[0068] ΔDIFFERENCE_VALUE 二区 =WATER_FLOW_SP2-WATER_FLOW_PV2;

[0069] Based on the principle of "fixed total water flow in zones one and two," the zone linkage function is activated. This difference is then fed back to the zone with normal water supply pipelines in zone one or two, resulting in a new preset water supply value:

[0070] If the water supply to Zone 1 is abnormal, the preset water supply value for Zone 2 will be increased, and Zone 2 will perform internal PID adjustment based on the new preset water supply value, while the opening of the diaphragm valve in Zone 1 will remain unchanged.

[0071] WATER_FLOW_SP2Δ=WATER_FLOW_SP2+ΔDIFFERENCE_VALUE 一区 ;

[0072] If the water supply to Zone 2 is abnormal, the preset water supply value for Zone 1 will be increased, and Zone 1 will perform internal PID adjustment based on the new preset water supply value, while the opening of the diaphragm valve in Zone 2 will remain unchanged.

[0073] WATER_FLOW_SP1 Δ =WATER_FLOW_SP1+ΔDIFFERENCEV_ALUE 二区 .

[0074] Step 6, Scenario 2: Abnormal water supply in Zone 3. Due to equipment issues such as nozzle blockage or diaphragm valve malfunction, or insufficient water supply capacity in Zone 3, the diaphragm valve opening in Zone 3 remains at its minimum or maximum. The actual moisture content at the rehumidifier outlet does not meet the preset moisture requirement and exceeds the preset threshold. In this case, maintain the current diaphragm valve opening in Zone 3, disconnect the negative feedback of RC80 outlet moisture to adjust the preset value of the Zone 3 water flow, and simultaneously establish a new cascaded PID control. This involves adjusting the preset total water supply value for Zones 1 and 2 based on the difference between the actual and set values ​​of the RC80 outlet moisture content to compensate for the required outlet moisture content.

[0075] like Figure 6 As shown, when the three-zone water supply pipeline system malfunctions, causing the actual moisture value at the outlet of the rehumidifier to fail to meet the set moisture requirement and exceed the preset threshold (0.5%), and this condition persists for more than 20 seconds, the actual moisture value at the RC80 outlet will be disconnected. 回潮后 The PV negative feedback adjusts the preset water level value WATER_FLOW_SP3 for the three zones, keeping the current opening degree of the water supply diaphragm valve in the three zones unchanged, that is:

[0076] Three-zone water supply diaphragm valve opening degree = VALVE_CV3;

[0077] Establish a new cascaded PID control, namely, based on the actual moisture content WS at the RC80 outlet. 回潮后 PV and setpoint WS 回潮后 The difference is used to obtain an output value CV through PID calculation, ranging from -100 to 100. This value is then multiplied by a water addition correction factor K (K is a device performance parameter, K = 40) to obtain the water addition adjustment amount ΔWATER_FLOW_SP. The preset total water addition value for Zone 1 and Zone 2, WATER_FLOW_SP, is then added to ΔWATER_FLOW_SP to obtain the new preset total water addition value for Zone 1 and Zone 2, WATER_FLOW_SP. n e w ,Right now

[0078] WATER_FLOW_SP new =WATER_FLOW_SP + CV * K;

[0079] Adjusted preset water addition value for Zone 1 and Zone 2: WATER_FLOW_SP new The water supply parameters, preset to WATER_FLOW_SP1, are then redistributed proportionally to zones one and two. new and WATER_FLOW_SP2 new ,Right now

[0080] Preset water flow rate for Zone 1:

[0081] WATER_FLOW_SP1 new =7 * WATER_FLOW_SP new / 12;

[0082] Preset water flow rate for Zone 2:

[0083] WATER_FLOW_SP2 new =5 * WATER_FLOW_SP new / 12;

[0084] At this time, as Figure 6 As shown, after rehydration, the outlet moisture is negatively fed back to the preset value of the total water addition in Zone 1 and Zone 2, establishing a new PID closed-loop control. Combined with the water flow closed-loop control of Zone 1 and Zone 2 themselves, a new cascade PID control is formed, achieving the purpose of accurately controlling the outlet moisture of RC80 and realizing the normal rehydration of expanded tobacco.

[0085] The method for redistributing and adjusting the water addition in each zone under abnormal working conditions of the RC80 rehumidification device described in steps five and six above is based on the premise that the actual water addition capacity of each zone after adjustment can meet the requirements of normal production. That is, the moisture content at the RC80 outlet can reach the target value after final adjustment, so as to achieve normal rehumidification of expanded tobacco.

[0086] Figure 8 This is a block diagram illustrating an expanded tobacco rehydration apparatus according to some embodiments of the present disclosure. Figure 8 As shown, the expanded tobacco rehydration device 800 includes an acquisition module 810, a calculation module 820, an allocation module 830, a monitoring module 840, a first adjustment module 850, a second adjustment module 860, a third adjustment module 870, and a generation module 560.

[0087] The acquisition module 810 is configured to acquire the moisture content index before rehydration, the moisture content index after rehydration, the tobacco flow rate index, and the actual water addition efficiency coefficient.

[0088] The calculation module 820 is configured to calculate the total water flow rate of the tobacco shreds based on the moisture content index before rehydration, the moisture content index after rehydration, the tobacco shred flow rate index, and the actual water addition efficiency coefficient.

[0089] The distribution module 830 is configured to obtain the preset water flow rate for the first zone, the preset water flow rate for the second zone, and the preset water flow rate for the third zone based on the actual water supply capacity of the first zone water supply pipeline system, the second zone water supply pipeline system, and the third zone water supply pipeline system, and to distribute the total water flow rate of the tobacco according to the principle of fixing the total water supply in the first zone and the total water supply in the second zone and distributing it internally according to a ratio.

[0090] The monitoring module 840 is configured to monitor the actual flow rate of water added to the first zone, the actual flow rate of water added to the second zone, the actual flow rate of water added to the third zone, and the actual moisture content after rehydration.

[0091] The first adjustment module 850 is configured to compare the actual water flow rate of the first zone and the actual water flow rate of the second zone with the preset water flow rate of the first zone and the preset water flow rate of the second zone, respectively, and adjust the opening degree of the pneumatic diaphragm regulating valve of the first zone and the pneumatic diaphragm regulating valve of the second zone based on the comparison result.

[0092] The second adjustment module 860 is configured to compare the actual flow rate of water added to the third zone with the preset flow rate of water added to the third zone, and adjust the opening degree of the pneumatic diaphragm regulating valve in the third zone based on the comparison result.

[0093] The third adjustment module 870 is configured to calculate the difference between the actual moisture content after rehydration and the index moisture content after rehydration, and adjust the preset flow rate of water added to the third zone based on the calculation result to achieve normal rehydration of the expanded tobacco.

[0094] In the device of this embodiment, a control concept of zone linkage and parameter self-optimization is adopted. The whole system consists of a dual internal closed-loop PID water addition system and a dual-loop cascade PID water addition system, with the three zones working together to optimize the water addition control process, thereby achieving normal rehumidification of expanded tobacco. It can achieve the function of optimizing the water addition parameters of the three zones under normal conditions and achieving self-optimization of the water addition parameters of each zone under abnormal conditions, accurately and stably controlling the moisture content at the RC80 outlet, thus achieving normal rehumidification of expanded tobacco.

[0095] Figure 9 This is a block diagram illustrating an expanded tobacco rehydration apparatus according to other embodiments of the present disclosure.

[0096] like Figure 9As shown, the expanded tobacco rehydration device 900 includes a memory 910 and a processor 920 coupled to the memory 910. The memory 910 is used to store instructions for performing embodiments of the expanded tobacco rehydration method. The processor 920 is configured to perform the expanded tobacco rehydration method in any of the embodiments of this disclosure based on the instructions stored in the memory 910.

[0097] Figure 10 This is a block diagram illustrating a computer system for implementing some embodiments of the present disclosure. Figure 10 As shown, the computer system 1000 can be represented in the form of a general computing device. The computer system 1000 includes a memory 1010, a processor 1020, and a bus 1030 connecting different system components.

[0098] The memory 1010 may include, for example, system memory, non-volatile storage media, etc. The system memory may store, for example, an operating system, application programs, a boot loader, and other programs. The system memory may include volatile storage media, such as random access memory (RAM) and / or cache memory. The non-volatile storage media may store, for example, instructions for performing at least one embodiment of the expanded tobacco rehydration method. Non-volatile storage media include, but are not limited to, disk storage, optical storage, flash memory, etc.

[0099] The processor 1020 can be implemented using a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete hardware components such as discrete gates or transistors. Correspondingly, each module, such as the acquisition module, calculation module, allocation module, monitoring module, first adjustment module, second adjustment module, and third adjustment module, can be implemented by executing instructions from the central processing unit (CPU)'s runtime memory to perform the corresponding steps, or by implementing dedicated circuitry to perform the corresponding steps.

[0100] Bus 1030 can use any of the various bus architectures. For example, bus architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MCA) bus, and Peripheral Component Interconnect (PCI) bus.

[0101] The computer system 1000 may also include an input / output interface 1040, a network interface 1050, and a storage interface 1060. These interfaces 1040, 1050, and 1060, as well as the memory 1010 and processor 1020, can be connected via a bus 1030. The input / output interface 1040 provides a connection interface for input / output devices such as a monitor, mouse, and keyboard. The network interface 1050 provides a connection interface for various networked devices. The storage interface 1060 provides a connection interface for external storage devices such as floppy disks, USB flash drives, and SD cards.

[0102] Various aspects of this disclosure are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus, and computer program products according to embodiments of this disclosure. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations thereof, can be implemented by computer-readable program instructions.

[0103] These computer-readable program instructions are provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable device to produce a machine, such that execution of the instructions by the processor produces means for implementing the functions specified in one or more boxes of the flowchart and / or block diagram.

[0104] These computer-readable program instructions may also be stored in a computer-readable storage medium. These instructions cause a computer to work in a particular manner to produce an article of manufacture, including instructions that implement the functions specified in one or more boxes in a flowchart and / or block diagram.

[0105] This disclosure may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects.

[0106] This disclosure employs a zone-linked, parameter-self-optimizing control concept. The overall system comprises a dual internal closed-loop PID water supply system and a dual-loop cascade PID water supply system, with the three zones working together to optimize the water supply control process and achieve normal rehumidification of expanded tobacco. It achieves optimized water supply parameters in all three zones under normal conditions and self-optimization of water supply parameters in each zone under abnormal conditions, precisely and stably controlling the moisture content at the RC80 outlet, thus ensuring normal rehumidification of the expanded tobacco.

[0107] The method, apparatus, and medium for rehydrating expanded tobacco according to this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0108] While specific embodiments of this disclosure have been described in detail by way of example, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A method for rehydrating expanded tobacco shreds, characterized in that, The method includes: Obtain the moisture content index before rehydration, the moisture content index after rehydration, the tobacco flow rate index, and the actual water addition efficiency coefficient; The total water flow rate of the tobacco shreds is calculated based on the moisture content before rehydration, the moisture content after rehydration, the flow rate of the tobacco shreds, and the actual water addition efficiency coefficient. Based on the actual water supply capacity of the first, second, and third zone water supply pipeline systems, and according to the principle of fixing the total water supply in the first and second zones while distributing it proportionally within each zone, the preset water supply flow rates for the first, second, and third zones are obtained; wherein, the actual water supply capacity of the first zone > the actual water supply capacity of the second zone > the actual water supply capacity of the third zone. Monitor the actual water flow rate in the first zone, the second zone, the third zone, and the actual moisture content after rehydration; The actual water flow rate of the first zone and the actual water flow rate of the second zone are compared with the preset water flow rate of the first zone and the preset water flow rate of the second zone, respectively, and the opening degree of the pneumatic diaphragm regulating valve of the first zone and the pneumatic diaphragm regulating valve of the second zone is adjusted based on the comparison results. The actual flow rate of water added to the third zone is compared with the preset flow rate of water added to the third zone, and the opening degree of the pneumatic diaphragm regulating valve in the third zone is adjusted based on the comparison result. The difference between the actual moisture content after rehydration and the index moisture content after rehydration is calculated, and the preset water flow rate in the third zone is adjusted based on the calculation result to achieve normal rehydration of the expanded tobacco. Furthermore, after adjusting the preset water flow rate for the third zone, if the difference between the preset water flow rate and the actual water flow rate for the first zone is greater than or equal to a flow threshold, it indicates an anomaly in the first zone; if the difference between the preset water flow rate and the actual water flow rate for the second zone is greater than or equal to a flow threshold, it indicates an anomaly in the second zone. In this case, the preset water flow rate for the third zone remains unchanged, and the preset water flow rate for the second zone is increased; and... Based on the principle that the total water supply value of Zone 1 and Zone 2 remains unchanged, the zone linkage function is activated. The difference between the preset water supply flow rate and the actual water supply flow rate of the abnormal zone in Zone 1 and Zone 2 is fed back to the zone in Zone 1 and Zone 2 where the water supply pipeline is not abnormal: the part of insufficient water supply in Zone 1 due to abnormality is supplemented by Zone 2, and Zone 2 performs internal PID adjustment according to the new preset water supply value, while the opening of the diaphragm valve in Zone 1 remains unchanged; or, the part of insufficient water supply in Zone 2 due to abnormality is supplemented by Zone 1, and Zone 1 performs internal PID adjustment according to the new preset water supply value, while the opening of the diaphragm valve in Zone 2 remains unchanged.

2. The method for rehydrating expanded tobacco shreds according to claim 1, characterized in that, After adjusting the preset flow rate of water added to the third zone based on the calculation results, the method further includes: When the actual moisture content after rehydration is detected to be different from the index moisture content after rehydration and the difference between the two exceeds a preset threshold, and the duration exceeds T, the negative feedback of the actual moisture content after rehydration on the adjustment of the preset flow rate of water added to the third zone is disconnected, and the opening of the pneumatic diaphragm regulating valve in the third zone remains unchanged. The output value is calculated based on the difference between the actual moisture content after rehydration and the index moisture content after rehydration, and the output value is multiplied by the water addition correction factor to obtain the water addition adjustment amount. The preset water flow rate of the first zone, the preset water flow rate of the second zone, and the water adjustment amount are added together to obtain the preset total water volume. The total preset water volume is proportionally redistributed into preset water flow rates for the first zone and the second zone.

3. A device for rehydrating expanded tobacco, characterized in that, include: Memory; as well as A processor coupled to the memory, the processor being configured to execute the expanded tobacco rehydration method as described in any one of claims 1 to 2 based on instructions stored in the memory.

4. A computer-storable medium, characterized in that, It stores computer program instructions that, when executed by a processor, implement the expanded tobacco rehydration method as described in any one of claims 1 to 2.

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