CN109998142B - Control method for temperature of cylinder of cut-tobacco drier - Google Patents
Control method for temperature of cylinder of cut-tobacco drier Download PDFInfo
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- CN109998142B CN109998142B CN201910363683.XA CN201910363683A CN109998142B CN 109998142 B CN109998142 B CN 109998142B CN 201910363683 A CN201910363683 A CN 201910363683A CN 109998142 B CN109998142 B CN 109998142B
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Abstract
The invention discloses a control method of cylinder temperature of a cut tobacco dryer, which comprises the steps of establishing a mathematical model of cut tobacco flow, incoming material moisture, moisture increase, outlet moisture and standard working dewatering amount, calculating the corresponding relation between the cut tobacco flow and different incoming material moisture on the premise of keeping HT steam working pressure, cut tobacco dryer cylinder temperature, cut tobacco drying hot air temperature unchanged and moisture increase, outlet moisture and standard working dewatering amount as preset constants, and taking the calculated value of the cut tobacco flow as a set value after cut tobacco dryer parameter adjustment. The method can quickly determine the accurate flow corresponding to the moisture of different incoming materials, and realizes the accuracy and the reliability of adjustment; the operation is simple and applicable, and the stub bar is usually adjusted in place once after entering the wire drying cylinder; the temperature of the cylinder body can be controlled in a constant temperature manner, the consistency of the quality stability and the processing strength in batches and between batches is ensured, the stability of the sensory quality of cigarettes is profound, and the method is worthy of popularization and application.
Description
Technical Field
The invention belongs to the technical field of cut tobacco making in the tobacco industry, and particularly relates to a method for controlling the temperature of a cylinder body of a KLD-2 cut tobacco dryer in the cut tobacco making process.
Background
In the tobacco industry, the tobacco shred drying process is always concerned by enterprises as a key process for making tobacco shreds, and the problem of how to produce the tobacco shreds with stable quality is a long-term research problem for the enterprises.
In the long-term production process of enterprises, each factory has own experience and method, but the uncertainty of the moisture of cut tobacco incoming materials is a common problem of all enterprises.
The moisture of the tobacco shred drying incoming material has the problems of inconsistent retention time of tobacco leaves between stored leaves, personnel skill difference and the like caused by the feeding control precision difference, the change of production environment, production organization and the like of the previous process due to long process flow of the tobacco shred preparation process, and the fluctuation of different degrees occurs between batches. The inconsistency of the moisture of the supplied materials among batches can cause the inconsistency of the temperature of the cut tobacco drying cylinder body among batches, thereby causing the difference of the processing strength among batches and directly influencing the stability of the filling value of the cut tobacco after the batch drying and the fluctuation of the sensory quality of cigarettes. To ameliorate this abnormal situation, there are generally three solutions: the first is to adjust the rotating speed of the cylinder, the second is to adjust the HT steam application amount (or steam working pressure), and the third is to adjust the leaf thread flow. Of the three solutions, the adjustment of the leaf thread flow is applied more.
At present, in the tobacco shred production management and control of a company, three precious tobacco brand apply a flow control method. In the actual production process, an operator adjusts the leaf shred flow rate to be about 50kg/h up or down according to the water change of 0.2 percent, which is an empirical value and has low accuracy. In addition, during regulation and control, an operator starts to regulate the tobacco shred flow rate after obvious fluctuation appears according to the moisture display value at the tobacco shred drying outlet, and the method for regulating the tobacco shred flow rate has three defects:
firstly, the adjustment is delayed, and the adjustment can be carried out after the cut tobacco is conveyed to a cut tobacco drying outlet and the moisture instrument displays stability;
secondly, the adjustment accuracy is not high, and the flow is often required to be adjusted for multiple times to meet the control of the temperature of the cylinder;
and thirdly, the temperature fluctuation of the cylinder is still large, normally, the temperature fluctuates within the range of +/-3 ℃ of the design value, and occasionally, the temperature fluctuates beyond the range of +/-3 ℃.
Disclosure of Invention
The invention aims to provide a control method of the cylinder temperature of a cut-tobacco drier aiming at a KLD-2 cut-tobacco drier, which can quickly and accurately realize the constant temperature control of the cylinder temperature of the cut-tobacco drier by adjusting the flow rate of cut-tobacco.
In order to solve the problems, the invention adopts the following technical scheme:
referring to fig. 2, a method for controlling the temperature of a cylinder of a cut-tobacco drier comprises the following steps:
establishing a mathematical model of the leaf shred flow, incoming material moisture, moisture increase, outlet moisture and standard working water removal amount;
step two, a group of preset values comprising leaf shred flow, moisture increase, outlet moisture, standard work water removal amount, HT steam working pressure, shred drying cylinder temperature and shred drying hot air temperature are given, and the preset values of the moisture increase, the outlet moisture and the standard work water removal amount are used as constants to be substituted into a mathematical model;
and step three, keeping preset values of the leaf shred flow, the HT steam working pressure, the shred drying cylinder temperature and the shred drying hot air temperature unchanged, taking the stable value as incoming material moisture when the incoming material moisture is stable, substituting the incoming material moisture into the mathematical model in the step two to obtain a leaf shred flow calculation value, and substituting the leaf shred flow calculation value for the leaf shred flow preset value of the shred dryer.
As shown in fig. 3, the present invention alternatively employs the following method:
a control method for the temperature of a cylinder of a cut-tobacco drier comprises the following steps:
establishing a mathematical model of the leaf shred flow, incoming material moisture, moisture increase, outlet moisture and standard working water removal amount;
step two, a group of preset values comprising leaf shred flow, moisture increase, outlet moisture, standard work water removal amount, HT steam working pressure, shred drying cylinder temperature and shred drying hot air temperature are given, the preset values of the moisture increase, the outlet moisture and the standard work water removal amount are used as constants to be substituted into a mathematical model, leaf shred flow corresponding to different incoming material moisture is calculated, and then the leaf shred flow is output in a table form;
and step three, keeping preset values of the cut tobacco flow, the HT steam working pressure, the cut tobacco drying cylinder temperature and the cut tobacco drying hot air temperature unchanged, when the incoming material moisture is stably displayed, taking the stable value as the incoming material moisture, inquiring the cut tobacco flow corresponding to the same incoming material moisture in the output table of the step two, and replacing the cut tobacco flow preset value of the cut tobacco drying machine with the cut tobacco flow.
The second step also comprises comparing the historical set value of the leaf shred flow with the calculated value of the leaf shred flow, and rechecking the moisture increase and an online moisture meter for measuring the incoming material moisture when the absolute value of the difference value of the two values is larger than or equal to a set threshold value (the rechecking refers to the calibration of a related metering instrument); the leaf shred flow calculation value is a leaf shred flow value calculated according to an incoming material water historical set value and a mathematical model.
Further, in the second step, the values of different incoming material moisture are equal difference series including historical incoming material moisture set values.
Further, the tolerance range of the arithmetic progression is more than or equal to 0.001, and the difference between the incoming material moisture historical set value and the first item of the arithmetic progression is equal to the difference between the last item and the incoming material moisture historical set value.
Alternatively, in the second step, Microsoft Excel software is adopted, the cut tobacco flow, the incoming material moisture, the moisture increase, the outlet moisture and the standard working dewatering amount are respectively used as list heads, and a mathematical model is used as a cut tobacco flow calculation formula to obtain a corresponding table of different incoming material moisture and cut tobacco flow calculation values under the condition of preset values of the moisture increase, the outlet moisture and the standard working dewatering amount.
Preferably, the mathematical model in the first step of the two control methods is:
a ═ L/((1-H) × ((H +. DELTA.h)/(1-H-. DELTA.h) -H/(1-H))), wherein:
a is the flow rate of the cut tobacco (unit: kg/h);
h is incoming material moisture which is the incoming material moisture (shown by decimal) displayed by an online moisture meter;
Δ H is the moisture gain, which is the difference (expressed in decimal numbers) between the HT outlet moisture measured by the oven method and the incoming material moisture measured by the oven method;
h is outlet moisture which is a set value (decimal) of the outlet moisture of the cut tobacco drier;
l is the standard working water removal amount (unit: kg/h).
Specifically, in the two control methods, preset values of cut tobacco flow, moisture increase, outlet moisture, standard work water removal amount, HT steam working pressure, cut tobacco drying cylinder temperature and cut tobacco drying hot air temperature related to the second step are historical set values of the cut tobacco drying machine.
Alternatively, the two control methods described above may be converted into an apparatus for dryer drum temperature control comprising a processor and a memory, the memory having stored thereon computer program instructions which, when executed by the processor, implement the two aforementioned dryer drum temperature control methods.
Alternatively, the two control methods described above may be designed as a computer-readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the two aforementioned control methods of dryer barrel temperature.
The control method may be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as a stand-alone product. The technical solution of the present invention can be essentially embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Compared with the prior art, the invention adopts a test of regulating the constant temperature of the cylinder body by adopting the flow on the KLD-2 cut tobacco drying machine and carries out corresponding verification, for example, from the result of a certain brand of noble cigarettes, the average value of the water content at the outlet of the cut tobacco of a batch is 13.04 percent and is consistent with the set value 13.0 percent, the standard deviation of the water content at the outlet is 0.128 percent, the water content at the outlet is relatively stable, the temperature of the cylinder body is controlled within the range of +/-1 ℃ of the set value, and the requirement of regulating the constant temperature of the cylinder body by the flow is realized.
The invention has the advantages that:
firstly, the accurate flow corresponding to different incoming material moisture can be quickly determined, and the accuracy and the reliability of adjustment are realized;
secondly, the operation is simple and applicable, the adjustment of the flow of the cut tobacco is not required to be carried out until the cut tobacco is conveyed to a cut tobacco drying outlet and the moisture instrument shows stability, and the cut tobacco is usually adjusted in place once after a stub bar enters a cut tobacco drying cylinder;
thirdly, the temperature of the cylinder body can be controlled in a constant temperature manner, the consistency of the quality stability and the processing strength in batches and among batches is ensured, the method has profound significance on the stability of the sensory quality of cigarettes, and is a method worthy of popularization and application.
Drawings
FIG. 1 is a flow chart of the KLD-2 cut tobacco drying process of the present invention;
fig. 2 and fig. 3 are flow charts of two different forms of barrel temperature control methods of the present invention, respectively.
Detailed Description
The technical solution of the present invention is further explained below with reference to the accompanying drawings, but the claimed protection scope is not limited to the above.
As shown in figure 1, the process of KLD-2 cut tobacco drying is as a flow chart
Representing an online moisture meter, H0 is the moisture of the incoming material detected by an oven method, H1 is the moisture of the incoming material displayed by the online moisture meter, H2 is the moisture of the HT outlet detected by the oven method, H is the set value of the moisture of the outlet of the cut tobacco drier, and delta H represents the increase of the moisture.
When Microsoft Excel is adopted to be matched with the control method of the table output form shown in the figure 3, the implementation flow is as follows:
obtaining through brand standards: and (4) setting the moisture content h (%) at the cut tobacco outlet.
Secondly, looking up the historical setting data of the brand central control to obtain: the cut tobacco flow A (kg/H), incoming material moisture H (decimal), HT steam working pressure (bar), moisture increase delta H (decimal), cut tobacco drying cylinder temperature (DEG C), cut tobacco drying hot air temperature (DEG C) and standard working water removal amount L (kg/H).
Thirdly, the first and second items of data are listed in Excel work and stored for standby, and a mathematical model formula is listed in the next row of the table, as shown in the table one:
meter-leaf flow calculation
And fourthly, inputting a value H in a second row of incoming material moisture in the table I, observing whether the historical preset value of the leaf shred flow A in the table is consistent with the calculated leaf shred flow A (the closer the value is, the better the value is), and when the deviation is more than or equal to 10kg/H, testing and comparing the moisture increase with an online moisture meter.
Fifthly, when the calculated value of the leaf shred flow A in the first table is closer to the historical preset value of the leaf shred flow A, designing the range of possible occurrence of the incoming material moisture H by taking the H value as the center and adding or subtracting 0.1% (0.001) in the upper and lower directions, and inputting the range into an Excel working table, wherein the range is shown in the second table:
design of water content of supplied material of top-two leaf shred
Setting formulas (including reference relations corresponding to incoming material moisture, moisture increase, outlet moisture and standard working dewatering amount) in the leaf shred flow cells, selecting a second row of leaf shred flow columns by using a mouse, dragging the mouse downwards, and automatically calculating leaf shred flow rates A1, A2, A3 … A … A8, A9 and A10 corresponding to different predicted incoming material moisture by EXCEL, wherein the formula is shown in the third table:
leaf shred flow corresponding to water contents of different incoming materials of table III
During production, after the moisture H of the incoming material is stable, looking up a table III to obtain a calculated value of the cut tobacco flow A corresponding to the moisture of the incoming material, then modifying a historical set value of the cut tobacco flow A of the equipment, and at the moment, the cut tobacco just enters a KLD-2 cut tobacco drying machine.
The method for controlling the temperature of the cylinder according to the present invention will be described in detail below by taking the adjustment of the tobacco dryer for a brand of noble cigarettes from Guiyang cigarette factories, which is a company of limited responsibility in the tobacco industry in Guizhou, as an example.
Firstly, looking up the brand of 'noble cigarette (XX)' of a certain production line of a Guiyang cigarette factory to obtain the set value h of the moisture at the cut tobacco drying outlet of 13.0%.
Secondly, looking up historical setting data of the brand central control: the flow A (kg/H) of the cut tobacco is not fixed, the working pressure of HT steam is 1.0bar, the moisture increase delta H is 2.0 percent, the moisture H of the supplied material is approximately equal to 19.4 percent to 19.6 percent, and the temperature of the cut tobacco drying cylinder fluctuates in the range of 138 ℃ to 145 ℃.
When the moisture content of the incoming material is 19.4%, two conditions are obtained in the control:
when the flow rate of the cut tobacco is 2900kg/h, the standard working dewatering point is 287kg/h, and the temperature of the cylinder is 140 ℃;
when the leaf thread flow is 3030kg/h, the standard working water removal point is 300kg/h, and the cylinder temperature is 143 ℃.
As discussed, the barrel temperature of 143 ℃ was determined for validation.
The data obtained in the first step and the second step are listed in the first column of an Excel table, then the moisture increase, the outlet moisture and the dehydration amount are input into the second column, the leaf thread flow formula is L/((1-H) ((H +. DELTA.H)/(1-H-. DELTA.H) — (1-H))) is input into the second column, and the incoming material moisture, the moisture increase, the outlet moisture and the standard working water removal amount are respectively referred to by L and Delta H, H, H in the formula to form a unit cell, and the following table four is formed.
Watch four
Then 19.4% (0.194) of the incoming material moisture in the second column is input into the moisture H cell of the incoming material in the third row, and the result of the EXCEL automatic calculation is shown as table five:
watch five
The calculated flow rates are completely coincident.
According to the more frequent incoming material moisture H, which is approximately equal to 19.4% -19.6%, averaging (19.5%) to obtain a central value, conducting incoming material moisture gradient prediction, filling the central value into an Excel table, selecting a second column of flow, and dragging a mouse (by utilizing the automatic filling function of the Excel) to obtain flow values corresponding to different incoming material moisture, as shown in the following table six:
watch six
The sixth table is used for a test of a constant temperature control method of a flow regulation cylinder of a brand 'noble smoke (XX)' KLD-2 cut tobacco drier.
Before production, the standard working water removal amount in a formula library is set to be 300L/h, the HT steam working pressure is set to be 1.0bar, the water content is set to be 2.0%, the temperature of a cut tobacco drying cylinder body is 143 ℃, the cut tobacco flow rate is 3000kg/h, and the hot air temperature is unchanged (110 ℃).
When the moisture of the tobacco shred incoming material gradually rises from 0% to 19.4% (when an online moisture meter displays about 30 seconds), the tobacco shred just comes out of an HT outlet and does not enter a KLD-2 cylinder body, and when the online moisture meter displays about 40 seconds), the moisture of the tobacco shred incoming material is found to be stabilized at about 19.6%, then a table is looked up to six, the flow rate of the tobacco shred is 2959kg/h, 3030kg/h is modified to 2959kg/h, and the time of the tobacco shred entering the KLD-2 cylinder body is shorter than 1 minute. After the KLD-2 cut-tobacco drier is switched into a production state from a standby state, the temperature of a cylinder body is quickly increased to 143 ℃. The batch of cut tobacco is adjusted once only until the batch of cut tobacco is processed, and the temperature of the tube body of the KLD-2 cut tobacco dryer is kept within the range of 143 +/-1 ℃ in batches. From the results, it is shown that: the temperature of the KLD-2 cut-tobacco drier cylinder completely meets the expected experimental effect.
Claims (9)
1. A control method for the temperature of a cylinder of a cut-tobacco drier is characterized by comprising the following steps:
establishing a mathematical model of the leaf shred flow, incoming material moisture, moisture increase, outlet moisture and standard working water removal amount;
step two, a group of preset values comprising leaf shred flow, moisture increase, outlet moisture, standard work water removal amount, HT steam working pressure, shred drying cylinder temperature and shred drying hot air temperature are given, and the preset values of the moisture increase, the outlet moisture and the standard work water removal amount are used as constants to be substituted into a mathematical model;
step three, keeping preset values of the leaf shred flow, the HT steam working pressure, the tobacco shred drying cylinder temperature and the tobacco shred drying hot air temperature unchanged, taking a stable value as incoming material moisture when the incoming material moisture is stable, substituting the incoming material moisture into the mathematical model in the step two to obtain a leaf shred flow calculation value, and substituting the leaf shred flow calculation value for the leaf shred flow preset value of the tobacco shred dryer;
the mathematical model in the first step is as follows: a ═ L/((1-H) × ((H +. DELTA.h)/(1-H-. DELTA.h) -H/(1-H))), wherein:
a is the leaf thread flow;
h is incoming material moisture which is displayed by an online moisture meter;
Δ H is the moisture gain, which is the difference between the HT outlet moisture measured by the oven method and the incoming material moisture measured by the oven method;
h is outlet moisture which is a set value of the outlet moisture of the cut tobacco dryer;
and L is the standard working dewatering amount.
2. A control method for the temperature of a cylinder of a cut-tobacco drier is characterized by comprising the following steps:
establishing a mathematical model of the leaf shred flow, incoming material moisture, moisture increase, outlet moisture and standard working water removal amount;
step two, a group of preset values comprising leaf shred flow, moisture increase, outlet moisture, standard work water removal amount, HT steam working pressure, shred drying cylinder temperature and shred drying hot air temperature are given, the preset values of the moisture increase, the outlet moisture and the standard work water removal amount are used as constants to be substituted into a mathematical model, leaf shred flow corresponding to different incoming material moisture is calculated, and then the leaf shred flow is output in a table form;
step three, keeping preset values of cut tobacco flow, HT steam working pressure, cut tobacco drying cylinder temperature and cut tobacco drying hot air temperature unchanged, when incoming material moisture is displayed stably, taking a stable value as incoming material moisture, inquiring cut tobacco flow corresponding to the same incoming material moisture in an output table of the step two, and replacing the cut tobacco flow preset value of the cut tobacco dryer with the cut tobacco flow;
the mathematical model in the first step is as follows: L/((1-H) × ((H +. DELTA.H)/(1-H-. DELTA.H) -H/(1-H))), wherein:
a is the leaf thread flow;
h is incoming material moisture which is displayed by an online moisture meter;
Δ H is the moisture gain, which is the difference between the HT outlet moisture measured by the oven method and the incoming material moisture measured by the oven method;
h is outlet moisture which is a set value of the outlet moisture of the cut tobacco dryer;
and L is the standard working dewatering amount.
3. A method of controlling the temperature of a cylinder of a cut-tobacco drier according to claim 1 or 2, wherein:
in the second step, preset values of the leaf shred flow, the moisture increase, the outlet moisture, the standard working dewatering amount, the HT steam working pressure, the cut tobacco drying cylinder temperature and the cut tobacco drying hot air temperature are historical set values of the cut tobacco drying machine.
4. The method for controlling the temperature of a cylinder of a cut-tobacco drier according to claim 2, wherein:
in the second step, the values of different incoming material moisture are equal difference number series comprising historical incoming material moisture set values.
5. The method for controlling the temperature of a cylinder of a cut-tobacco drier according to claim 4, wherein the method comprises the following steps:
the method also comprises the steps of comparing the historical set value of the leaf shred flow with the calculated value of the leaf shred flow, and rechecking the water increase and an online water content meter for measuring the water content of the incoming material when the absolute value of the difference value of the two values is larger than or equal to a set threshold value;
the leaf shred flow calculation value is a leaf shred flow value calculated according to an incoming material water historical set value and a mathematical model.
6. The method of claim 4, wherein the method further comprises the steps of:
the tolerance range of the arithmetic progression is more than or equal to 0.001, and the difference between the incoming material moisture historical set value and the first item of the arithmetic progression is equal to the difference between the last item and the incoming material moisture historical set value.
7. The method for controlling the temperature of a cylinder of a cut-tobacco drier according to claim 2, wherein:
in the second step, Microsoft Excel software is adopted, leaf shred flow, incoming material moisture, moisture increase, outlet moisture and standard work dewatering amount are respectively used as list heads, and a mathematical model is used as a leaf shred flow calculation formula to obtain a corresponding table of different incoming material moisture and leaf shred flow calculation values under the conditions of preset values of the moisture increase, the outlet moisture and the standard work dewatering amount.
8. The utility model provides a device for cut-tobacco drier barrel temperature control which characterized in that:
comprising a processor and a memory, said memory having stored thereon computer program instructions which, when executed by the processor, implement the method of controlling dryer drum temperature of any of claims 1 or 2.
9. A computer-readable storage medium characterized by:
the computer readable storage medium has stored thereon computer program instructions which, when executed by a processor, implement the method of controlling dryer drum temperature of any of claims 1 or 2.
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| CN110771935A (en) * | 2019-10-25 | 2020-02-11 | 贵州中烟工业有限责任公司 | Calculation method of 'dehydration standard working point' of KLD-2 cut-tobacco drier |
| CN111443680B (en) * | 2020-04-24 | 2021-03-05 | 龙岩烟草工业有限责任公司 | Control method, control device and cigarette processing equipment |
| CN112220094B (en) * | 2020-09-28 | 2022-09-06 | 福建中烟工业有限责任公司 | Method and device for drying tobacco shreds with constant processing strength and method and system for manufacturing tobacco shreds |
| CN112220093B (en) * | 2020-09-28 | 2023-03-21 | 福建中烟工业有限责任公司 | Method and device for drying tobacco shreds with constant water loss and method and system for manufacturing tobacco shreds |
| CN113892672B (en) * | 2021-09-30 | 2023-01-24 | 山东中烟工业有限责任公司 | Method and system for controlling parameter setting of roller cut-tobacco drier based on incoming material state |
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