A cut tobacco production line and a method of temperature control thereof

Abstract

The present application belongs to the technical field of tobacco drying, and discloses a cut tobacco drying production line and a temperature control method thereof. The cut tobacco drying production line comprises a SIROX moisture regenerator, a feeding device, a loose moisture regenerating device and a cut tobacco dryer. The loose moisture regenerating device, the feeding device, the SIROX moisture regenerator and the cut tobacco dryer are connected through a conveyor belt. A second moisture meter is installed at the front end of the feeding device, and the second moisture meter measures the moisture content of cut tobacco as W2. A third moisture meter is installed at the rear end of the loose moisture regenerating device, and the third moisture meter measures the moisture content of cut tobacco as W3. A front moisture meter is installed between the SIROX moisture regenerator and the feeding device, and a rear moisture meter is installed at the rear end of the cut tobacco dryer. The problem that the cut tobacco dryer cannot be stably kept at the process design temperature due to the large error caused by the adjustment of the water adding proportion according to experience in the moisture regenerating process in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the tobacco drying technical field, and particularly relates to a cut tobacco drying production line and a temperature control method thereof. BACKGROUND

[0002] Tobacco drying is an important process in the cigarette processing process, and the cut tobacco drying process not only has an influence on the physical indexes of cut tobacco such as whole tobacco rate and filling value, but also has an influence on the smoke indexes and sensory evaluation quality of cigarettes. The key equipment in the cut tobacco drying process is a cut tobacco dryer, and the process task of the cut tobacco dryer is to remove part of the moisture in the cut tobacco, dry the cut tobacco, improve the processing resistance of the cut tobacco, and meet the processing requirements of the subsequent processes. Usually, a KLD-2 cut tobacco dryer is used, and a steam pipeline is arranged in the cut tobacco dryer. The steam in the steam pipeline is used to heat the heat exchange sheet, so that the moisture in the cut tobacco is dried out by using the heat of the sheet. The moisture content of the incoming cut tobacco is measured by a front-end moisture meter and is fed back to the PLC control program of the cut tobacco dryer. The required dehydration amount (i.e. the amount of water that needs to be removed from the incoming cut tobacco) is calculated. A moisture meter is arranged at the outlet position to measure the moisture content and feed back to the PLC control program of the cut tobacco dryer. Combined with the dehydration amount, the required heat exchange sheet temperature is automatically calculated, and finally the accurate control of the moisture at the outlet of the cut tobacco dryer is realized. Therefore, the moisture content of the cut tobacco and the sheet temperature have a direct functional relationship.

[0003] However, the tobacco material needs to go through processes such as loose re-moistening, feeding and leaf storage before entering the cut tobacco dryer. Before entering the cut tobacco dryer, the moisture content in each batch of cut tobacco fluctuates inconsistently. Since the temperature of the cut tobacco cylinder wall is related to the moisture content in the cut tobacco, the temperature of the cylinder wall of each batch is inconsistent, which leads to the fact that the quality of the cut tobacco after drying cannot meet the target requirements. In the prior art, the amount of water added during loose re-moistening is intervened by the operator according to experience to achieve the purpose of stabilizing the temperature of the cut tobacco cylinder wall. However, this control mode has uncertainty, and the error of operation is large. The sheet temperature also fluctuates according to the amount of water added by the operator, which leads to the fact that the temperature in the cut tobacco dryer cannot match the drying temperature required by the cut tobacco, and finally the quality of the cut tobacco after drying is reduced. SUMMARY

[0004] The purpose of the present application is to provide a cut tobacco drying production line and a temperature control method thereof, which solve the problem that the amount of water added is adjusted according to experience in the prior art, the error is large, and the cut tobacco dryer cannot be stabilized at the process design temperature.

[0005] To achieve this objective, the present invention adopts the following technical solution: The present invention provides a tobacco drying production line, including a SIROX rehumidifier, a feeding device, a loosening rehumidifier, and a tobacco drying machine. The loosening rehumidifier, the feeding device, the SIROX rehumidifier, and the tobacco drying machine are connected by a conveyor belt. A second moisture meter is installed at the front end of the feeding device, and the second moisture meter measures the moisture content of the tobacco as W2. A third moisture meter is installed at the rear end of the loosening rehumidifier, and the third moisture meter measures the moisture content of the tobacco as W3. A pre-moisture meter is installed between the SIROX rehumidifier and the feeding device, and a post-moisture meter is installed at the rear end of the tobacco drying machine.

[0006] Let ΔM be the change in moisture content of the tobacco shreds, W1 be the moisture content of the tobacco shreds at the inlet of the drying machine, ΔW1 be the change in moisture content at the inlet of the tobacco shreds, and ΔT be the temperature change of the heating cylinder inside the drying machine. ΔT and ΔM have a functional relationship. ΔW1 and ΔM also have a functional relationship and are calculated from ΔM, so ΔT will have a functional relationship with ΔW1. W1 and W2 have a functional relationship, and W2 and W3 have a functional relationship, so it can be deduced that ΔT and W3 have a mathematical relationship. The moisture content of the tobacco shreds measured by the pre-moisture meter and the post-moisture meter has a functional relationship with ΔM. The change in water added by the loosening and rehumidifying device is ΔP, and the change in moisture content at the outlet of the loosening and rehumidifying device is ΔW3. ΔP and ΔW3 have a functional relationship, so ΔP and ΔT have a functional relationship.

[0007] Preferably, ΔT = ΔM / 8.5 is derived from the drying machine program.

[0008] Preferably, the moisture content at the yarn drying outlet is set to 12.8, and the moisture content is increased by 1.6 by the SIROX rehumidifier. Then, ΔW1 = ΔM / 61, and further, ΔT = ΔW1 / 0.14 can be obtained.

[0009] Preferably, the result measured by the second moisture meter is fitted with W1 to obtain W1 = 0.9261W2 + 1.8921.

[0010] Preferably, the results measured by the second moisture meter and the third moisture meter are fitted together to obtain W2 = 0.9617W3 - 0.266.

[0011] As a preferred embodiment, since the constant weight formula for tobacco dry matter is M╳(1-W)=M'╳(1-W'), it is possible to derive ΔP=0.8ΔW3, and further ΔT=ΔP / 0.12.

[0012] Preferably, the front end of the SIROX rehumidifier is equipped with an electronic belt scale, which can weigh the tobacco on the conveyor belt.

[0013] A cut tobacco production line temperature control method, comprising the cut tobacco production line, further comprising the following steps:

[0014] S1, the cut tobacco is conveyed by a conveyor belt, which can provide flow data of cut tobacco conveying to a PLC control system in the cut tobacco machine;

[0015] S2, the tobacco material passes through the loose moisture recovery device, the feeding device, the SIROX moisture recovery machine and the cut tobacco machine in sequence, wherein the second moisture meter, the third moisture meter, the pre-positioned moisture meter and the post-positioned moisture meter obtain the moisture content value of the cut tobacco;

[0016] S3, the pre-positioned moisture meter obtains the moisture content of the incoming cut tobacco, which is fed back to the PLC control program of the cut tobacco machine, the program calculates the water removal amount, the post-positioned moisture meter obtains the moisture content of the outlet cut tobacco, which is fed back to the PLC control program of the cut tobacco machine, combined with the water removal amount, the required barrel wall temperature in the cut tobacco machine is calculated;

[0017] S4, when the barrel temperature deviates from the preset value, combined with ΔT=ΔP / 0.12, the water amount of the loose moisture recovery device is adjusted.

[0018] S5, the barrel temperature in the cut tobacco machine approaches the preset value, when the barrel temperature deviates from the preset value, the step S4 is repeated.

[0019] Beneficial effects: the third moisture meter is installed at the rear end of the loose moisture recovery device, the moisture change of the tobacco material after water addition in the loose moisture recovery device is measured, then the cut tobacco moisture content measured by the moisture meter is fitted together through the formula set in the second moisture meter and the PLC control system in the cut tobacco machine, combined with ΔT=ΔM / 8.5 and ΔW1=ΔM / 61, ΔT=ΔW1 / 0.14 is derived, then the water change amount of the loose moisture recovery device is ΔP, since ΔP=0.8ΔW3, the function relationship between ΔP and ΔT is finally established, that is, the function relationship between the water addition change amount of the loose moisture recovery device and the heating barrel temperature in the cut tobacco machine is calculated through the formula, the temperature change in the heating barrel can be directly controlled through the water addition amount, the temperature of the cut tobacco machine is adjusted, the cut tobacco entering the cut tobacco machine can be accurately baked in the subsequent work, and then the drying quality and consistency of the cut tobacco can be improved, the purpose of timely and accurately adjusting the loose moisture recovery water addition ratio according to the cut tobacco barrel temperature deviation from the design value is achieved, the cut tobacco barrel temperature is stabilized, the product quality of the final cut tobacco is higher, and the cut tobacco quality is consistent. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is the working flow chart of the cut tobacco machine of the present application;

[0021] Fig. 2 is the fitting function diagram of W3 and W2 of the present application;

[0022] Fig. 3 Figure is a fitting function graph of W1 and W2 of the present application.

[0023] Figure: 1, SIROX regenerating machine; 2, cuttting machine; 3, pre-hygrometer; 4, post-hygrometer; 5, conveyer belt. DETAILED DESCRIPTION

[0024] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. In addition, it should be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings rather than all the parts.

[0025] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0027] In the description of the present embodiment, the terms "upper", "lower", "right", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the purpose of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0028] In the current technology, before the tobacco drying production line, the tobacco material needs to be processed through multiple processes. The above control is carried out by the PLC control system. The PLC control system detects the difference in moisture content between the tobacco entering and leaving the drying machine and adjusts accordingly. However, when adding water to the loosening and rehydration device, water is generally added manually based on experience. This results in inaccurate temperature control inside the drying machine and cannot guarantee the stability of the tobacco quality.

[0029] To solve the above problems, such as Figs. 1 to 3 As shown, the present invention provides a tobacco drying production line, including a SIROX rehumidifier 1, a feeding device, a loosening rehumidifier, and a tobacco drying machine 2. The loosening rehumidifier, the feeding device, the SIROX rehumidifier 1, and the tobacco drying machine 2 are connected by a conveyor belt 5. A second moisture meter is installed at the front end of the feeding device, and the second moisture meter measures the moisture content of the tobacco as W2. A third moisture meter is installed at the rear end of the loosening rehumidifier, and the third moisture meter measures the moisture content of the tobacco as W3. A pre-moisture meter 3 is installed between the SIROX rehumidifier 1 and the feeding device, and a post-moisture meter 4 is installed at the rear end of the tobacco drying machine 2.

[0030] The moisture content of the tobacco at the inlet of the drying machine is set as W1, which can be measured by the pre-moisture meter 3. The change in moisture content at the inlet of the tobacco is ΔW1. The temperature change of the heating cylinder inside the drying machine 2 is set as ΔT. ΔT has a functional relationship with ΔM. ΔW1 has a functional relationship with ΔM and is calculated from ΔM, so ΔT will have a functional relationship with ΔW1. W1 has a functional relationship with W2, and W2 has a functional relationship with W3. Therefore, it is deduced that ΔT has a mathematical relationship with W3. The moisture content of the tobacco measured by the pre-moisture meter 3 and the post-moisture meter 4 has a functional relationship with ΔM. The change in water added by the loosening and rehumidifying device is ΔP, and the change in moisture at the outlet of the loosening and rehumidifying device is ΔW3. ΔP has a functional relationship with ΔW3, which ultimately establishes a functional relationship between ΔP and ΔT. This refers to the mathematical relationship established between the change in water added to the loosening and rehumidifying device and the change in temperature inside the cylinder. When adding water, a formula can be used for precise water addition. Compared to adding water based on experience in the early stages, the formula can accurately determine the amount of water to add, thereby precisely controlling the temperature change inside the drying machine 2. This ensures that the temperature inside the drying machine 2 does not deviate from the set value, resulting in consistent and better quality of the tobacco shreds after drying. Here, "Δ" represents the difference in values ​​of the same category per unit time; this is a publicly known mathematical concept and will not be elaborated upon here.

[0031] The change amount of the tobacco moisture removal amount is ΔM, since the KLD-2 cut tobacco dryer 2 is used, the tobacco moisture removal amount = flow rate x (100 - inlet moisture) x (inlet moisture + SIROX added moisture - cut tobacco outlet moisture / (100 - cut tobacco outlet moisture) / (100 - inlet moisture - SIROX added moisture), wherein the front moisture meter 3 detects the cut tobacco inlet moisture W1, and the rear moisture meter 4 detects the cut tobacco outlet moisture, which are substituted into the above formula, wherein the cut tobacco outlet moisture is set to 12.8%, the SIROX added moisture is set to 1.6%, and ΔW1 = ΔM / 61 is derived; the cylinder temperature calculation formula of the KLD-2 cut tobacco dryer 2 is cylinder temperature set temperature = cylinder temperature standard working point + (moisture removal amount - moisture removal amount standard working point) x drying factor + deviation, wherein the deviation is the difference between the actual cylinder wall temperature corresponding to the moisture of the tobacco sent out of the cut tobacco dryer 2 and the required cylinder wall temperature corresponding to the set target moisture, wherein the drying factor is 0.118, and ΔT = ΔM / 8.5 is obtained, and ΔT = ΔW1 / 0.14 is obtained by combining ΔW1 = ΔM / 61.

[0032] Wherein the cylinder temperature setting formula and the cut tobacco moisture removal amount formula are self-contained in the PLC control system of the KLD-2 cut tobacco dryer 2, and the design principle is not described here, and ΔT = ΔM / 8.5 and ΔW1 = ΔM / 61 can be directly obtained according to the design principle of the KLD-2 cut tobacco dryer 2, and the above formula is only applicable to the KLD-2 cut tobacco dryer 2.

[0033] As shown in Fig. 3 , W1 = 0.9261W2 + 1.8921 is obtained by fitting the results measured by the second moisture meter and W1, and a functional relationship between W1 and W2 is established.

[0034] As shown in Fig. 2 , W2 = 0.9617W3 - 0.266 is obtained by fitting the results measured by the second moisture meter and the third moisture meter, and a functional relationship between W3 and W2 is established, and a functional relationship between W1 and W3 is established in turn.

[0035] Since the amount of tobacco dry matter is constant, the formula M x (1-W) = M' x (1-W') can be derived, and ΔP = 0.8ΔW3, since a functional relationship between W1 and W3 has been established, a functional relationship between P and W1 can be established, since ΔT = ΔW1 / 0.14, ΔT = ΔP / 0.12 can be derived, and the change in the water addition amount of the loose conditioning and humidifying device will cause the temperature change of the heating sheet in the cut tobacco dryer 2, through the above mathematical relationship, the temperature control in the cut tobacco dryer 2 can be more intuitive and accurate, and the quality of the cut tobacco after drying can be improved.

[0036] The SIROX conditioner 1 is provided with an electronic belt scale at the front end, which can weigh the cut tobacco on the conveying belt 5, and the PLC control system is installed on the cut tobacco dryer 2 to calculate the actual temperature in the cut tobacco dryer 2, and after the actual temperature and the process design temperature change AT are calculated, the water amount of the tobacco material in the next stage is adjusted by the loose conditioner according to the final formula AT = AP / 0.12

[0037] A temperature control method of a cut tobacco production line, comprising the following steps:

[0038] S1, the cut tobacco is conveyed by the conveying belt 5, and the conveying belt 5 can provide the flow data of the cut tobacco conveying to the PLC control system in the cut tobacco dryer 2;

[0039] S2, the tobacco material passes through the loose conditioner, the feeding device, the SIROX conditioner 1 and the cut tobacco dryer 2 in sequence, wherein the second moisture meter, the third moisture meter, the pre-positioned moisture meter 3 and the post-positioned moisture meter 4 obtain the moisture content value of the cut tobacco;

[0040] S3, the pre-positioned moisture meter obtains the moisture content of the incoming cut tobacco, and feeds back to the PLC control program of the cut tobacco dryer, the program calculates the water removal amount, the post-positioned moisture meter obtains the moisture content of the outlet cut tobacco, and feeds back to the PLC control program of the cut tobacco dryer, and the required cylinder wall temperature is calculated in combination with the water removal amount;

[0041] S4, when the cylinder temperature deviates from the preset value, the water amount of the loose conditioner is adjusted in combination with AT = AP / 0.12.

[0042] S5, the cylinder temperature in the cut tobacco dryer 2 approaches the preset value, and when the cylinder temperature deviates from the preset value, the step S4 is repeated.

[0043] It should be particularly pointed out that the temperature in the cylinder can be monitored by the KLD-2 cut tobacco dryer 2, when the temperature deviates from the preset value, the water amount of the loose conditioner is adjusted according to the temperature deviation through the final adjustment formula AT = AP / 0.12, so that the moisture content carried by the cut tobacco dried in the next stage changes, at this time, the KLD-2 cut tobacco dryer 2 detects the change through the pre-positioned moisture meter, and then adjusts the temperature in the KLD-2 cut tobacco dryer 2, so that the cut tobacco in the next stage can be baked at the preset temperature.

[0044] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For ordinary skilled persons in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. It is unnecessary and impossible to enumerate all the implementation modes. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A wire drying production line, characterized in that, The device includes a SIROX rehumidifier (1), a feeding device, a loosening rehumidifier, and a drying machine (2). The loosening rehumidifier, the feeding device, the SIROX rehumidifier (1), and the drying machine (2) are connected by a conveyor belt (5). A second moisture meter is installed at the front end of the feeding device, and the second moisture meter measures the moisture content of the tobacco as W2. A third moisture meter is installed at the rear end of the loosening rehumidifier, and the third moisture meter measures the moisture content of the tobacco as W3. A pre-moisture meter (3) is installed between the SIROX rehumidifier (1) and the feeding device. A post-moisture meter (4) is installed at the rear end of the drying machine (2). Let ΔM be the change in moisture content of the tobacco shreds, W1 be the moisture content of the tobacco shreds at the inlet of the drying machine (2), ΔW1 be the change in moisture content at the inlet of the tobacco shreds, and ΔT be the temperature change of the heating cylinder inside the drying machine (2). ΔT and ΔM have a functional relationship, ΔW1 and ΔM have a functional relationship and are calculated through ΔM, so ΔT and ΔW1 have a functional relationship; W1 and W2 have a functional relationship, W2 and W3 have a functional relationship, so it is deduced that ΔT and W3 have a mathematical relationship. The moisture content of the tobacco shreds measured by the pre-moisture meter (3) and the post-moisture meter (4) has a functional relationship with ΔM. The change in water added by the loosening and rehydration device is ΔP, and the change in moisture content at the outlet of the loosening and rehydration device is ΔW3. ΔP and ΔW3 have a functional relationship, so ΔP and ΔT have a functional relationship. Based on the program of the wire drying machine (2), ΔT = ΔM / 8.5 is derived; If the moisture content at the outlet of the drying yarn is set to 12.8%, and the moisture content is increased by 1.6% by the SIROX rehumidifier (1), then ΔW1 = ΔM / 61, and thus ΔT = ΔW1 / 0.

14. The result measured by the second moisture meter was fitted with W1, resulting in W1 = 0.9261W2 + 1.8921; The results measured by the second moisture meter and the third moisture meter were fitted together to obtain W2=0.9617W3-0.266; Based on the constant weight formula for tobacco dry matter, ΔP = 0.8ΔW3 is derived, and then ΔT = ΔP / 0.12 is derived.

2. The wire drying production line according to claim 1, characterized in that, The SIROX rehumidifier (1) is equipped with an electronic belt scale at the front end, which weighs the tobacco on the conveyor belt (5).

3. A temperature control method for a wire drying production line, characterized in that, Used for temperature control of the wire drying production line as described in claim 2, and also Includes the following steps: S1, the tobacco shreds are conveyed by the conveyor belt (5), and the conveyor belt (5) provides the flow data of the tobacco shreds to the PLC control system in the drying machine (2); S2, tobacco material passes through a loosening and rehydration device, a feeding device, a SIROX rehydration machine (1) and a drying machine (2) in sequence, wherein the second moisture meter, the third moisture meter, the pre-moisture meter (3) and the post-moisture meter (4) obtain the moisture content value of the tobacco material; S3, the pre-moisture meter (3) obtains the moisture content of the incoming tobacco shreds and feeds it back to the PLC control program of the drying machine. The program calculates the amount of water removed. The post-moisture meter (4) obtains the moisture content of the outlet tobacco shreds and feeds it back to the PLC control program of the drying machine. Combined with the amount of water removed, the required cylinder wall temperature inside the drying machine (2) is calculated. S4. When the temperature inside the cylinder deviates from the preset value, adjust the water addition of the loosening and rehumidifying device according to ΔT=ΔP / 0.

12. S5, the temperature inside the drum of the filament dryer (2) is close to the preset value. When the drum temperature deviates from the preset value, repeat step S4.

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