Methods for regulating the flow rate and moisture content of materials during silk production and drying

Abstract

The present invention discloses a method for controlling the flow rate of tobacco shreds by measuring the moisture content at the outlet of the tobacco shreds. The tobacco shreds enter a drying drum for drying. The detected moisture content at the outlet of the drying drum and a set moisture content at the outlet are input to the input terminal of a moisture metering control unit. The output terminal of the moisture metering control unit outputs a moisture compensation amount. The moisture compensation amount, dehydration amount, dehydration coefficient, and the moisture content at the inlet of the drying drum are used as inputs to an inlet tobacco shred control unit. The output terminal of the inlet tobacco shred control unit outputs the tobacco flow rate. The method for controlling the flow rate of tobacco shreds entering the drying drum using the inlet tobacco shred control unit includes: calculating a first correction value Temp1, a second correction value Temp2, a third correction value Temp3, a fourth correction value Temp4, and a fifth correction value Temp5 for the tobacco flow rate, and determining the tobacco flow rate L based on the production start-up time and the instantaneous value of the outlet moisture content. 调节 =L 设定 +Temp5, otherwise, the tobacco flow rate will be the set tobacco flow rate.

Description

Technical Field

[0001] This invention belongs to the field of tobacco processing line manufacturing systems, and in particular relates to a method for regulating the flow rate and moisture content of tobacco drying materials in a 7-6 drying process. Background Technology

[0002] In the cigarette manufacturing process, the tobacco processing stage is a crucial step. The tobacco processing stage involves a series of steps, including cutting the tobacco leaves from the parchment into boxes, slicing, moistening and adding flavorings, leaf aging, cutting into shreds, leaf shred expansion, leaf shred drying, blending, and flavoring, to produce finished tobacco shreds that meet specific technological standards and are ready for rolling.

[0003] In the series of processing steps in the tobacco processing stage, the tobacco leaf drying process involves using specific drying equipment and processes to evaporate the moisture in the tobacco leaves at high temperatures, so that the processed tobacco leaves meet the moisture content requirements of the process.

[0004] The airflow drying machine is mainly used for processing expanded tobacco. Its main function is to dry a certain quality of tobacco with high-temperature gas, reducing the moisture content from about 20% to the required 12%-13%.

[0005] A conventional airflow drying machine consists of an outlet moisture meter, a moisture calculation and control unit, a high-temperature gas temperature control unit, a high-temperature gas temperature sensor, a gas flow control unit, and a gas flow sensor.

[0006] Conventional technical conditions: The airflow drying machine for tobacco processing mainly completes the processing and production of expanded tobacco. Its main process function is to dry a certain quality of tobacco with high-temperature gas, reducing the moisture content from about 20% to between 12% and 13% as required by the process.

[0007] A conventional airflow tobacco drying machine consists of an outlet moisture meter, a moisture calculation and control unit, a high-temperature gas temperature control unit, a high-temperature gas temperature sensor, a gas flow control unit, and a gas flow sensor. The outlet moisture meter measures the moisture content of the tobacco material at the outlet of the airflow drying machine, compares it with the outlet moisture content set by the process requirements, and calculates and adjusts the required gas flow rate, indirectly changing the high-temperature gas temperature to achieve dehydration and drying of the tobacco.

[0008] Disadvantages / Deficiencies of Conventional Technology: Existing technology results in extremely short drying times for tobacco shreds in the drying gas pipeline of the drying machine, only 6 to 10 seconds. Adjusting the high-temperature drying gas temperature by changing the gas flow rate is slow, requiring an average of over 1 minute to reach the appropriate temperature. This makes it difficult to promptly affect the moisture content of the tobacco shreds, with an average reaction time of over 2 minutes, leading to significant fluctuations in the moisture content of the tobacco shreds at the outlet of the airflow drying machine. Summary of the Invention

[0009] The purpose of this invention is to provide a method for controlling the moisture content of tobacco shreds by adjusting the flow rate of the airflow drying material. By maintaining a stable temperature of the high-temperature drying gas, the method eliminates the need to adjust the temperature of the high-temperature drying gas through changes in the gas flow rate. Instead, by adjusting the inlet material flow rate, the method promptly affects the moisture content of the tobacco shreds, ensuring that the moisture content of the tobacco shreds at the outlet of the airflow drying machine remains within a stable range.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] This invention discloses a method for controlling tobacco flow rate by measuring the outlet moisture content of tobacco shreds. The tobacco shreds enter a drying cylinder for drying, and the ambient temperature of the drying cylinder remains constant. The detected outlet moisture content of the tobacco shreds in the drying cylinder and a set outlet moisture content are input to the input terminal of a moisture metering control unit. The output terminal of the moisture metering control unit outputs a moisture compensation amount. The moisture compensation amount, dehydration amount, dehydration coefficient, and the inlet moisture content of the tobacco shreds in the drying cylinder are used as inputs to an inlet tobacco shred control unit. The output terminal of the inlet tobacco shred control unit outputs the tobacco flow rate, which is used to control the tobacco flow rate in the drying cylinder. The method for controlling the tobacco flow rate entering the drying cylinder using the inlet tobacco shred control unit is as follows:

[0012] (I) Calculating the first correction value Temp1 for tobacco flow rate

[0013] (SP (in)m -SP (out)m ) / (PV (in)m -SP (out)m ) = Temp1

[0014] SP (in)m SP is the setpoint for inlet moisture content. (out)m PV is the setpoint for export moisture content. (in)m This represents the instantaneous value of the inlet moisture content;

[0015] (II) Calculation of the second correction value Temp2 for tobacco flow rate

[0016] {Temp1-1.0}*K+1.0=Temp2

[0017] K is the dehydration coefficient, which is set in the formulation parameters and ranges from 0.1 to 1.3.

[0018] (III) Calculate the third correction value Temp3 for tobacco flow rate

[0019] The third correction value, Temp3, is calculated 120 seconds after the tobacco is initially output from the tobacco tube.

[0020] SP (start)weigh *Temp2=Temp3

[0021] SP (start)weigh The flow rate of tobacco is set manually;

[0022] (iv) Calculate the fourth correction value Temp4 for tobacco flow rate

[0023] Based on the moisture adjustment correction amount CV output by the moisture metering and control unit (out)m The fourth correction value, Temp4, is calculated only during the yarn drying machine production stage.

[0024] CV (out)m *A = Temp4

[0025] CV (out)m The output adjustment amount of the moisture metering and control unit is the moisture compensation amount. A is the additional weight of tobacco required for each 1% increase in moisture content. The value of A ranges from 1 to 15 kg.

[0026] (v) Calculate the fifth correction value, Temp5, for tobacco flow rate.

[0027] (a) Within 10 minutes after production starts

[0028] When (SP) (out)m -PV (out)m When ) < -0.2%,

[0029] Tobacco flow rate L 调节 =L 设定 +Temp5, the correction value Temp5 decreases by 1kg every second; otherwise, the tobacco flow rate is the set tobacco flow rate; SP (out)m PV is the setpoint for export moisture content. (out)m L represents the instantaneous moisture content at the outlet. 设定 The tobacco flow rate is set manually;

[0030] (b) 10 minutes after production starts

[0031] When (SP) (out)m -PV (out)m When <-0.5%

[0032] Tobacco flow rate L 调节 =L 设定 +Temp5, the correction value Temp5 decreases by 1kg every 1 second; otherwise, the tobacco flow rate is the set tobacco flow rate.

[0033] The present invention discloses a method for controlling the flow rate of tobacco shreds by measuring the moisture content at the outlet of the tobacco shreds. The initial flow rate of the tobacco shreds upon entering the drying cylinder is manually set. During the production process, the set flow rate is adjusted according to the following formula.

[0034] SPweigh =SP (start)weigh *Temp2+Temp4+Temp5

[0035] Among them: SP weigh SP is used to adjust the set tobacco flow rate entering the drying cylinder. (start)weigh The initial flow rate of tobacco entering the drying cylinder is set manually.

[0036] The present invention relates to a method for controlling the flow rate of tobacco shreds by measuring the moisture content at the outlet of the tobacco shreds, wherein the moisture metering control unit is a moisture metering control unit that performs calculations based on a PID algorithm.

[0037] The present invention provides a method for controlling the flow rate of tobacco shreds by measuring the moisture content at the outlet of the tobacco shreds, wherein: the method for controlling the flow rate of tobacco shreds by measuring the moisture content at the outlet of the tobacco shreds calculates each batch of tobacco shreds as a unit, and re-initializes the tobacco shreds and the drying cylinder when the next batch of tobacco shreds enters the drying cylinder.

[0038] The method of controlling tobacco flow rate by measuring the outlet moisture content of the tobacco shreds in this invention has the following advantages:

[0039] In existing technologies, the time for raw tobacco shreds to pass through the drying gas pipeline of a tobacco drying machine is extremely short, only between 6 and 10 seconds. Adjusting the gas flow rate to change the high-temperature drying gas temperature is slow, requiring an average of over 1 minute to reach the appropriate temperature. The advantages of this invention over existing technologies are: it can quickly track and adjust the incoming flow rate with a short delay (less than 1 second) based on the detected moisture content of the tobacco shreds at the outlet, eliminating the need to adjust the slow-responding high-temperature drying gas temperature. This essentially eliminates the impact of high-temperature drying gas temperature fluctuations. Under a relatively constant drying gas flow environment, it can rapidly and dynamically adjust the dehydration rate of the airflow drying equipment, achieving precise control of the tobacco shreds' outlet moisture content within a relatively constant range for the entire batch and all time periods. Attached Figure Description

[0040] Figure 1 The system used in the method of controlling tobacco flow rate by measuring the outlet moisture content of tobacco shreds according to the present invention;

[0041] Figure 2 This is a flowchart of the method for controlling tobacco flow rate by measuring the outlet moisture content of tobacco shreds according to the present invention.

[0042] exist Figure 1 and Figure 2 In the diagram, number 1 is the moisture metering and control unit; number 2 is the inlet tobacco control unit; and number 3 is the tobacco drying cylinder. Detailed Implementation

[0043] like Figure 1 and Figure 2As shown, the system used in the method of controlling tobacco flow rate by the outlet moisture content of tobacco shreds according to the present invention includes: a moisture metering and control unit 1, an inlet tobacco shred control unit 2, and a drying cylinder 3. The tobacco shreds enter the drying cylinder 3 for drying, and the ambient temperature of the drying cylinder 3 remains constant. The detected tobacco outlet moisture content of the drying cylinder 3 and the set tobacco outlet moisture content are input to the input terminal of the moisture metering and control unit 1. The moisture metering and control unit 1 is a moisture metering and control unit that performs calculations based on a PID algorithm. The output terminal of the moisture metering and control unit 1 outputs a moisture compensation amount. The moisture compensation amount, dehydration amount, dehydration coefficient, and the tobacco inlet moisture content of the drying cylinder 3 are used as input terminals of the inlet tobacco shred control unit 2. The output terminal of the inlet tobacco shred control unit 2 outputs the tobacco flow rate. The method of controlling the tobacco flow rate entering the drying cylinder 3 using the inlet tobacco shred control unit 2 is as follows:

[0044] (I) Calculating the first correction value Temp1 for tobacco flow rate

[0045] (SP (in)m -SP (out)m ) / (PV (in)m -SP (out)m ) = Temp1

[0046] SP (in)m SP is the setpoint for inlet moisture content. (out)m PV is the setpoint for export moisture content. (in)m This represents the instantaneous value of the inlet moisture content;

[0047] Table 1 shows examples of calculating the first correction value Temp1 for numbers 1-20.

[0048]

[0049]

[0050] Table 1

[0051] (II) Calculation of the second correction value Temp2 for tobacco flow rate

[0052] {Temp1-1.0}*K+1.0=Temp2

[0053] K is the dehydration coefficient, which is set in the formulation parameters and ranges from 0.1 to 1.3.

[0054] Table 2 shows examples of calculating the second correction value Temp2 for numbers 1-20.

[0055] Serial Number Dehydration coefficient K Modify variable Temp1 Modify variable Temp2 1 0.1 0.946 0.995 2 0.2 0.946 0.989 3 1.3 0.946 0.930 4 0.4 0.864 0.946 5 0.35 0.910 0.969 6 0.6 1.045 1.027 7 0.7 0.909 0.936 8 0.8 0.833 0.867 9 1.1 0.856 0.841 10 1.2 0.985 0.982 11 0.1 1.097 1.010 12 0.2 1.096 1.019 13 0.3 0.930 0.979 14 0.45 1.081 1.036 15 0.5 1.227 1.114 16 0.66 0.937 0.958 17 0.75 0.903 0.927 18 1.2 1.117 1.140 19 0.9 1.230 1.207 20 1.3 0.956 0.943

[0056] Table 2

[0057] (III) Calculate the third correction value Temp3 for tobacco flow rate

[0058] The third correction value, Temp3, is calculated 120 seconds after the tobacco is initially output from the tobacco tube.

[0059] SP (start)weigh *Temp2=Temp3

[0060] SP (start)weigh The flow rate of tobacco is set manually;

[0061] Table 3 shows examples of calculating the third correction value Temp3 for serial numbers 1-20. In Table 3, SP (start)weigh The amount of tobacco flow rate is set differently for different people.

[0062] Serial Number Set the flow rate SP (start) weigh (kg / h) Modify variable Temp2 Corrected variable: Temp3 (kg / h) 1 3500 0.995 3482.5 2 3000 0.989 2967 3 3300 0.93 3069 4 3500 0.946 3311 5 3000 0.969 2907 6 3300 1.027 3389.1 7 3500 0.936 3276 8 3000 0.867 2601 9 3300 0.841 2775.3 10 3500 0.982 3437 11 3000 1.01 3030 12 3300 1.019 3362.7 13 3500 0.979 3426.5 14 3000 1.036 3108 15 3300 1.114 3676.2 16 3500 0.958 3353 17 3000 0.927 2781 18 3300 1.14 3762 19 3500 1.207 4224.5 20 3000 0.943 2829

[0063] Table 3

[0064] (iv) Calculate the fourth correction value Temp4 for tobacco flow rate

[0065] The moisture adjustment correction amount CV output by the moisture metering and control unit 1 (out)m The fourth correction value, Temp4, is calculated only during the yarn drying machine production stage.

[0066] CV (out)m *A = Temp4

[0067] CV (out)m The output adjustment amount of the moisture metering and control unit 1 is the moisture compensation amount. A is the weight of tobacco required to increase by 1% for each change in moisture. The value of A ranges from 1 to 15 kg.

[0068] Table 4 shows examples of calculating the fourth correction value Temp4 for numbers 1-15.

[0069]

[0070] Table 4

[0071] (v) Calculate the fifth correction value, Temp5, for tobacco flow rate.

[0072] (a) Within 10 minutes after production starts

[0073] When (SP) (out)m -PV (out)m When ) < -0.2%,

[0074] Tobacco flow rate L 调节 =L 设定 +Temp5, the correction value Temp5 decreases by 1kg every second; otherwise, the tobacco flow rate is the set tobacco flow rate; SP (out)mPV is the setpoint for export moisture content. (out)m L represents the instantaneous moisture content at the outlet. 设定 The tobacco flow rate is set manually;

[0075] (b) 10 minutes after production starts

[0076] When (SP) (out)m -PV (out)m When <-0.5%

[0077] Tobacco flow rate L 调节 =L 设定 +Temp5, the correction value Temp5 decreases by 1kg every 1 second; otherwise, the tobacco flow rate is the set tobacco flow rate.

[0078] When the tobacco initially enters the drying cylinder 3, the tobacco flow rate is set manually. During the production process, the tobacco flow rate is adjusted according to the following formula.

[0079] SP weigh =SP (start)weigh *Temp2+Temp4+Temp5

[0080] Among them: SP weigh To adjust the set tobacco flow rate entering the drying cylinder 3, SP (start)weigh The initial tobacco flow rate entering the drying cylinder 3 is set manually.

[0081] Table 5 shows examples of calculating the fifth correction value Temp5 for numbers 1-20, and

[0082]

[0083] Table 5

[0084] Numbers 1-20 or 1-15 represent 20 or 15 different embodiments.

[0085] The method of controlling the flow rate of tobacco shreds by the outlet moisture of tobacco shreds in this invention calculates each batch of tobacco shreds as a unit, and re-initializes the tobacco shreds and the drying cylinder 3 when the next batch of tobacco shreds enters the drying cylinder 3.

[0086] The above description only discloses specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or modifications that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling tobacco flow rate by means of tobacco outlet moisture content, wherein tobacco enters a drying drum (3) for drying, the ambient temperature of the drying drum (3) remains constant, the detected tobacco outlet moisture content of the drying drum (3) and the set tobacco outlet moisture content are input to the input terminal of a moisture metering control unit (1), the output terminal of the moisture metering control unit (1) outputs a moisture compensation amount, the moisture compensation amount, the dehydration amount, the dehydration coefficient and the tobacco inlet moisture content of the drying drum (3) are used as the input terminal of an inlet tobacco control unit (2), the output terminal of the inlet tobacco control unit (2) outputs the tobacco flow rate, and the tobacco flow rate is used to control the tobacco flow rate of the drying drum (3), characterized in that: The method for controlling the flow rate of tobacco entering the drying cylinder (3) using the inlet tobacco control unit (2) is as follows: (a) Calculating the first correction value Temp1 for tobacco flow rate ； Set the inlet moisture level. Set a value for export moisture content. This represents the instantaneous value of the inlet moisture content; (ii) Calculation of the second correction value Temp2 for tobacco flow rate {Temp1-1.0}*K+1.0= Temp2 K is the dehydration coefficient, which is set in the formulation parameters and ranges from 0.1 to 1.

3. (III) Calculate the third correction value Temp3 for tobacco flow rate The third correction value Temp3 for the tobacco flow rate is calculated 120 seconds after the tobacco is initially output from the drying cylinder (3). ； The initial tobacco flow rate entering the drying cylinder (3) is set manually. (iv) Calculate the fourth correction value Temp4 for tobacco flow rate Based on the moisture compensation amount output by the moisture metering control unit (1) The fourth correction value, Temp4, is calculated only during the yarn drying machine production stage. ； The output adjustment amount of the moisture metering control unit (1) is the moisture compensation amount. A is the weight of tobacco required to increase by 1% for each change in moisture. The value of A ranges from 1 to 15 kg. (v) Calculate the fifth correction value Temp5 for tobacco flow rate (a) Within 10 minutes after production starts when hour, Tobacco flow rate L 调节 =L 设定 +Temp5, the correction value Temp5 decreases by 1kg every 1 second; otherwise, the tobacco flow rate is the set tobacco flow rate. Set a value for export moisture content. This represents the instantaneous value of the export moisture content. The tobacco flow rate is set manually; (b) 10 minutes after production starts when hour Tobacco flow rate L 调节 =L 设定 +Temp5, the correction value Temp5 decreases by 1kg every 1 second; otherwise, the tobacco flow rate is the set tobacco flow rate. When the tobacco initially enters the drying cylinder (3), the set tobacco flow rate is manually set. During the production process, the set tobacco flow rate is adjusted according to the following formula. SP weigh =SP (start)weigh *Temp2+Temp4+Temp5 in: The set tobacco flow rate for entering the drying cylinder (3) after adjustment; The moisture metering control unit (1) is a moisture metering control unit (1) that performs calculations based on the PID algorithm.

2. The method for controlling tobacco flow rate by measuring the outlet moisture content of tobacco as described in claim 1, characterized in that: The method of controlling the tobacco flow rate by the outlet moisture of the tobacco is calculated with each batch of tobacco as a unit. When the next batch of tobacco enters the drying cylinder (3), the tobacco and the drying cylinder (3) are re-initialized.

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