Tobacco leaf baking system and control method thereof

Abstract

The invention discloses a tobacco leaf curing system and a control method thereof. Baking process curve parameters are set, the baking process curve parameters comprise the first duration of a yellowing period and the second duration of a color fixing period, the yellowing period comprises the early yellowing period and the later yellowing period, the concentration value of carbon dioxide in a tobacco loading chamber is detected in real time through a carbon dioxide detection device in the tobacco leaf baking process, and the concentration value of the carbon dioxide in the tobacco loading chamber is determined in the later yellowing period. And in the color fixing period, first baking duration corresponding to an inflection point at which the carbon dioxide concentration value starts to rise is obtained, the first duration is adjusted according to the first baking duration, and in the color fixing period, second baking duration corresponding to the carbon dioxide concentration value reaching a concentration preset value is obtained, and the second duration is adjusted according to the second baking duration. By means of the scheme, the curing parameter control precision can be improved, the tobacco leaf curing quality is improved, and the curing cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco leaf baking, and in particular to a tobacco leaf baking system and a control method thereof. Background Art

[0002] In most parts of my country, the three-stage baking process is adopted in the intensive flue-curing barns for tobacco leaf baking, including three stages: yellowing stage, color fixing stage and dry tendon stage, among which the yellowing stage includes the early and late yellowing stages. The tobacco leaf baking process is controlled by adjusting the heating of the combustion furnace and the air volume of the circulating fan. The corresponding heating rate, baking temperature and duration are set at different baking stages according to the requirements of the baking process curve, and the tobacco leaf baking process is finally completed.

[0003] In the prior art, the parameters of the baking process curve are pre-set, but during the baking process, the roaster needs to manually adjust the duration and set temperature of each stage in the baking process curve parameters according to the actual baking conditions of the tobacco leaves. This method requires manual participation, resulting in increased system costs. At the same time, relying on manual experience and judgment will have certain subjective factors, which can easily affect the baking quality of tobacco leaves.

[0004] In view of this, how to provide a solution that can solve the above technical problems is a technical problem that people in the relevant technical field need to solve. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a tobacco leaf baking system and a control method thereof, which can improve the control accuracy of baking parameters, improve the tobacco leaf baking quality, and save baking costs.

[0006] In one aspect, the present invention provides a control method for a tobacco leaf baking system, wherein the tobacco leaf baking system includes a tobacco loading chamber and a carbon dioxide detection device, and the control method includes: Setting baking process curve parameters, wherein the baking process curve parameters include a first duration of the yellowing period and a second duration of the color fixing period, and the yellowing period includes an early yellowing period and a late yellowing period; Detect the carbon dioxide concentration value in the smoke chamber by using a carbon dioxide detection device; In the late yellowing stage, a first baking time corresponding to an inflection point at which the carbon dioxide concentration value starts to rise is obtained, and the first continuous time is adjusted according to the first baking time; During the color fixing period, the second baking time corresponding to when the carbon dioxide concentration reaches a preset concentration value is obtained, and the second continuous time is adjusted according to the second baking time.

[0007] Preferably, adjusting the first duration according to the first baking duration includes: determining whether a first difference between the first toasting time and the first continuous time is within a first preset range; When the first difference is not within the first preset range, the first duration is adjusted to the first toasting duration.

[0008] Preferably, adjusting the second duration according to the second baking duration includes: determining whether a second difference between the second toasting time and half of the second duration is within a second preset range; When the second difference is not within the second preset range, the second duration is adjusted to twice the second toasting duration.

[0009] Preferably, the baking process curve parameter also includes a third duration of the dry rib period, and the control method further includes: During the dry period, the amplitude of the change in carbon dioxide concentration value was obtained; The third duration is adjusted according to the change amplitude.

[0010] Preferably, adjusting the third duration according to the change amplitude includes: determining whether the change amplitude is within a third preset range; When the change amplitude is not within the third preset range, the third duration is extended according to the preset duration until the change amplitude is within the third preset range.

[0011] Preferably, the control method further includes: An adjusted baking process curve is generated according to the adjusted first duration, second duration and third duration.

[0012] Preferably, the carbon dioxide detection device comprises a first sampling port arranged in the smoke chamber, and an air extraction pump and a carbon dioxide detector connected to the first sampling port in sequence.

[0013] Preferably, the carbon dioxide detection device further comprises a second sampling port arranged outside the smoke chamber, and the second sampling port is connected to an air extraction pump.

[0014] Preferably, the carbon dioxide detection device further comprises a reversing valve and a discharge port, the inlet of the reversing valve is connected to the air pump, the first outlet of the reversing valve is connected to the discharge port, and the second outlet of the reversing valve is connected to the carbon dioxide detector.

[0015] Another aspect of the present invention provides a tobacco leaf baking system, comprising: Install smoke chamber; A carbon dioxide detection device is used to detect the carbon dioxide concentration value in the smoke chamber; Among them, the tobacco leaf baking system uses the above-mentioned control method for the tobacco leaf baking system to control the tobacco leaf baking process.

[0016] The present invention has at least the following beneficial effects: The present invention sets baking process curve parameters, wherein the baking process curve parameters include a first duration of the yellowing period and a second duration of the color fixing period, the yellowing period includes an early yellowing period and a late yellowing period, and during the tobacco leaf baking process, a carbon dioxide detection device is used to detect the carbon dioxide concentration value in the tobacco loading chamber in real time, and in the late yellowing period, the first baking time corresponding to the inflection point where the carbon dioxide concentration value begins to rise is obtained, and the first duration is adjusted according to the first baking time, and in the color fixing period, the second baking time corresponding to when the carbon dioxide concentration value reaches a preset concentration value is obtained, and the second duration is adjusted according to the second baking time. The scheme of the present application can improve the control accuracy of baking parameters, improve the quality of tobacco leaf baking, and save baking costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a tobacco leaf baking system provided by an embodiment of the present invention; Figure 2 A schematic flow chart of a control method for a tobacco leaf baking system provided by an embodiment of the present invention; Figure 3 A schematic diagram of a carbon dioxide concentration variation curve provided by an embodiment of the present invention; Figure 4 A schematic flow chart of another control method for a tobacco baking system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The core of the present invention is to provide a tobacco leaf baking system and a control method thereof, which can improve the control accuracy of baking parameters, improve the tobacco leaf baking quality, and save baking costs.

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The embodiment of the present invention mainly provides a tobacco leaf baking system and a control method for the tobacco leaf baking system. In order to more clearly explain the present solution, the structure of the tobacco leaf baking system is first described.

[0022] See also Figure 1 In one aspect, an embodiment of the present invention provides a tobacco leaf baking system, comprising a tobacco loading chamber 8 and a carbon dioxide detection device for detecting the carbon dioxide concentration value in the tobacco loading chamber. Optionally, the tobacco leaf baking system may further include a heating chamber 1, a circulating fan 2, a cold air door 3, a dehumidification window 4, a tobacco hanging rack 5, a spare dehumidification window 6, a tobacco loading door 7, an air duct 9, a humidity sensor 10, a temperature sensor 11, and a control computer 23. Among them, the carbon dioxide detection device, the humidity sensor 10, and the temperature sensor 11 are all connected to the control computer 23, and a computer program is stored in the control computer 23. When the computer program is executed, a control method for controlling the tobacco leaf baking process is implemented. For the specific control method, please refer to the following embodiment.

[0023] Optionally, in the above embodiment, the carbon dioxide detection device includes a first sampling port 12 arranged in the smoke chamber, and an air pump 16 and a carbon dioxide detector 20 connected to the first sampling port 12 in sequence. In specific implementation, a first valve 13 is arranged between the first sampling port 12 and the air pump 16. After opening the first valve 13, the air pump 16 extracts the gas in the smoke chamber through the first sampling port 12 and sends it to the carbon dioxide detector 20, so that the carbon dioxide concentration value in the smoke chamber can be detected.

[0024] Furthermore, in the above embodiment, the carbon dioxide detection device also includes a second sampling port 14 arranged outside the smoke chamber, and the second sampling port 14 is connected to the air pump 16. In specific implementation, a second valve 15 is arranged between the second sampling port 14 and the air pump 16. In this embodiment, before detecting the carbon dioxide concentration value in the smoke chamber, the second valve 15 is opened first, and the air pump 16 extracts the gas outside the smoke chamber through the second sampling port 14 and sends it to the carbon dioxide detector 20 for calibration, and the second valve 15 is closed after the calibration is completed. It can be understood that the carbon dioxide concentration value detected by the second sampling port 14 is the carbon dioxide concentration value in the environment.

[0025] Furthermore, in the above embodiment, the carbon dioxide detection device further includes a reversing valve 17 and a discharge port, the inlet of the reversing valve 17 is connected to the air pump 16, the first outlet of the reversing valve 17 is connected to the discharge port, and the second outlet of the reversing valve 17 is connected to the carbon dioxide detector 20. In specific implementation, a third valve 21 and a fourth valve 22 are provided between the first outlet of the reversing valve 17 and the discharge port, the outlet of the carbon dioxide detector 20 is connected to the discharge port through the fourth valve 22, and a dryer 18 and a filter 19 are provided between the second outlet of the reversing valve 17 and the carbon dioxide detector 20. In this embodiment, after the calibration of the carbon dioxide detector 20 is completed, the first valve 13 is opened, and the vacuum pump 16 extracts the smoke in the smoke chamber through the first sampling port 12. At this time, the reversing valve 17 is switched to the first outlet, and the third valve 21 and the fourth valve 22 are opened to remove the impurity gas in the exhaust pipe. After the airflow stabilizes, the third valve 21 and the fourth valve 22 are closed, and the reversing valve 17 is switched to the second outlet. The smoke enters the carbon dioxide detector 20 after passing through the dryer 18 and the filter 19 to obtain the carbon dioxide concentration value in the smoke chamber.

[0026] It should be noted that the three-stage baking process is usually used for tobacco leaf baking in intensive curing rooms, including three stages: yellowing stage, color fixing stage and dry tendon stage, among which the yellowing stage includes the early yellowing stage and the late yellowing stage. In the existing technology, the "sequence" of the three stages mostly depends on personal baking experience, and the baking parameters are adjusted by observing the changes in the appearance of tobacco leaves such as color and shape, which is not only labor-intensive and time-consuming, but also has large fluctuations in tobacco leaf baking quality control.

[0027] In view of this, another aspect of the present invention provides a control method for a tobacco baking system, see Figure 2 It can be seen from the above embodiments that the tobacco leaf baking system includes a tobacco loading chamber and a carbon dioxide detection device, and the control method includes: Step S110, setting baking process curve parameters, wherein the baking process curve parameters include a first duration of the yellowing period and a second duration of the color fixing period, and the yellowing period includes an early yellowing period and a late yellowing period.

[0028] In the embodiment of the present invention, various parameters of the baking process curve are set, including the first duration of the yellowing period and the second duration of the color fixing period, so that the subsequent tobacco leaf baking process can be controlled according to the set baking process curve requirements. Optionally, the baking process curve parameters can also include parameters such as the temperature and humidity of the tobacco loading chamber at each stage.

[0029] Step S120: Detect the carbon dioxide concentration in the smoke chamber by using a carbon dioxide detection device.

[0030] In the embodiment of the present invention, during the tobacco leaf baking process, the carbon dioxide concentration value in the smoke loading chamber is detected in real time by a carbon dioxide detection device. The specific structure of the carbon dioxide detection device please refer to the description in the above embodiment. In specific implementation, multiple carbon dioxide detection points can be set, for example, 5 detection points are set, which are respectively set at the return air outlet, the middle, between layers, between leaves and the air inlet in the smoke loading chamber. When the trend of the change of the carbon dioxide concentration value detected by each detection point is greatly different, the data detected by each detection point are used according to the set priority order. Figure 3 As shown, the carbon dioxide concentration change curve can also be drawn in real time according to the carbon dioxide concentration value for easy viewing.

[0031] Step S130: In the later stage of yellowing, a first baking time corresponding to the inflection point at which the carbon dioxide concentration value starts to rise is obtained, and the first continuous time is adjusted according to the first baking time.

[0032] In the embodiment of the present invention, the inventor found in practice that in the early yellowing stage of tobacco leaf baking, due to sufficient reaction substrates, suitable baking temperature, and high enzyme activity (this period is also called enzymatic reaction period), microbial respiration requires a lot of energy, and sufficient reaction substrates such as sugars make the respiration strong, resulting in a continuous increase in the carbon dioxide concentration in the tobacco loading room; at the beginning of the late yellowing stage, the enzyme is inactivated due to the continuous increase in baking temperature, and the microbial respiration is weakened due to the reduction of reaction substrates, and the carbon dioxide concentration in the tobacco loading room decreases rapidly during the dehumidification stage; before the color fixing period, as the carbon dioxide concentration continues to decrease, due to the replacement of respiratory substrates, dehumidification causes the temperature to decrease, and the anaerobic respiration of the tobacco leaves themselves is strengthened, resulting in a slight rebound when the overall carbon dioxide concentration decreases. That is to say, in the late yellowing stage of tobacco leaf baking, the first baking time corresponding to the inflection point where the carbon dioxide concentration value in the tobacco loading room begins to rise during the reduction process can be obtained, and the first continuous time can be adjusted according to the first baking time, so that the baking time of the yellowing period is automatically adjusted according to the actual baking situation of the tobacco leaves, and the precise control of the baking parameters of the yellowing period is achieved.

[0033] In specific implementation, when adjusting the baking time of the yellowing period, the operating parameters of the heating chamber 1, the circulating fan 2 and the cold air door 3 can be adjusted to synchronously adjust parameters such as the temperature, humidity and circulating air volume in the smoke loading chamber. For specific adjustment methods, please refer to the prior art.

[0034] Step S140: During the color fixing period, a second baking time corresponding to when the carbon dioxide concentration reaches a preset concentration value is obtained, and the second continuous time is adjusted according to the second baking time.

[0035] In the embodiment of the present invention, the inventors also found in practice that after the tobacco leaves enter the color fixing period, as the temperature rises, the reaction substrate decreases, the microorganisms gradually inactivate, the respiration gradually stops, and the carbon dioxide concentration in the tobacco loading room continues to decrease, and tends to the ambient value in the middle of the color fixing period. In other words, during the color fixing period of tobacco leaves, the second baking time corresponding to when the carbon dioxide concentration reaches the preset concentration value can be obtained, and the second continuous time can be adjusted according to the second baking time, so as to automatically adjust the baking time of the color fixing period according to the actual baking conditions of the tobacco leaves, and realize the precise control of the baking parameters of the color fixing period.

[0036] It should be noted that the second baking time refers to the baking time after the tobacco leaves enter the color fixing period, that is, it does not include the baking time during the yellowing period. The preset concentration value can be set to the carbon dioxide concentration value in the environment, which can be detected by a carbon dioxide detection device before the tobacco leaves are baked.

[0037] In specific implementation, when adjusting the baking time of the color fixing period, the operating parameters of the heating chamber 1, the circulating fan 2 and the cold air door 3 can also be adjusted to synchronously adjust parameters such as the temperature, humidity and circulating air volume in the smoke loading chamber. Please refer to the prior art for specific adjustment methods.

[0038] As can be seen from the above, the control method for the tobacco baking system provided by the embodiment of the present invention sets the baking process curve parameters, wherein the baking process curve parameters include the first duration of the yellowing period and the second duration of the color fixing period, the yellowing period includes the early yellowing period and the late yellowing period, and during the tobacco baking process, the carbon dioxide concentration value in the tobacco loading chamber is detected in real time by a carbon dioxide detection device, and in the late yellowing period, the first baking time corresponding to the inflection point where the carbon dioxide concentration value begins to rise is obtained, and the first duration is adjusted according to the first baking time, and in the color fixing period, the second baking time corresponding to when the carbon dioxide concentration value reaches a preset concentration value is obtained, and the second duration is adjusted according to the second baking time. The scheme of the present application can improve the control accuracy of baking parameters, improve the quality of tobacco baking, and save baking costs.

[0039] Optionally, in the above embodiment, the first duration is adjusted according to the first baking duration in step S130, including: determining whether a first difference between the first toasting time and the first continuous time is within a first preset range; When the first difference is not within the first preset range, the first duration is adjusted to the first toasting duration.

[0040] In an embodiment of the present invention, the first preset range can be set according to tobacco leaf baking experience, for example, set to 1 hour or 2 hours, and this embodiment does not make specific limitations. After obtaining the first baking time corresponding to the inflection point where the carbon dioxide concentration value in the tobacco loading chamber begins to rise during the reduction process, the first difference between the first baking time and the first duration is calculated, and it is determined whether the first difference is in the first preset range. When the first difference is in the first preset range, the first duration can be adjusted, that is, the baking process curve of the yellowing period remains unchanged. When the first difference is not in the first preset range, the first duration is adjusted to the first baking time. For example, when the first duration is set to 90 hours, the first preset range is set to 2 hours. If the first baking time is 87 hours, the first duration is adjusted to 87 hours according to the calculation result, that is, the baking time of the yellowing period is shortened; if the first baking time is 93 hours, the first duration is adjusted to 93 hours according to the calculation result, that is, the baking time of the yellowing period is extended.

[0041] Optionally, in the above embodiment, the second duration is adjusted according to the second baking duration in step S140, including: determining whether a second difference between the second toasting time and half of the second duration is within a second preset range; When the second difference is not within the second preset range, the second duration is adjusted to twice the second toasting duration.

[0042] In the embodiment of the present invention, the second preset range can also be set according to tobacco leaf baking experience, for example, set to 1 hour or 2 hours, which is not specifically limited in this embodiment. After obtaining the second baking time corresponding to the carbon dioxide concentration value in the smoke-loading chamber reaching the preset concentration value, the second difference between the second baking time and half of the second duration is calculated, and it is determined whether the second difference is in the second preset range. When the second difference is in the second preset range, the second duration can be adjusted, that is, the baking process curve of the color fixing period remains unchanged. When the second difference is not in the second preset range, the second duration is adjusted to twice the second baking time. For example, when the second duration is set to 60 hours and the second preset range is set to 2 hours, if the second baking time is 27 hours, the second duration is adjusted to 54 hours according to the calculation result, that is, the baking time of the color fixing period is shortened; if the second baking time is 33 hours, the second duration is adjusted to 66 hours according to the calculation result, that is, the baking time of the color fixing period is extended.

[0043] Optionally, in the above embodiment, the baking process curve parameter further includes a third duration of the dry rib period, and the control method further includes: During the dry period, the amplitude of the change in carbon dioxide concentration value was obtained; The third duration is adjusted according to the change amplitude.

[0044] In the embodiment of the present invention, the inventors also found in practice that after the tobacco leaves enter the dry gluten stage, the respiration has completely stopped at this time, and the carbon dioxide concentration in the tobacco loading chamber tends to the ambient value and no longer changes significantly. That is to say, in the dry gluten stage of tobacco leaves, the variation amplitude of the carbon dioxide concentration value per unit time can be obtained, and the third duration can be adjusted according to the variation amplitude, so as to automatically adjust the baking duration of the dry gluten stage according to the actual baking conditions of the tobacco leaves, and realize the precise control of the baking parameters of the dry gluten stage.

[0045] Furthermore, in the above embodiment, adjusting the third duration according to the change amplitude includes: determining whether the change amplitude is within a third preset range; When the change amplitude is not within the third preset range, the third duration is extended according to the preset duration until the change amplitude is within the third preset range.

[0046] In an embodiment of the present invention, the third preset range and the preset duration can be set according to tobacco leaf baking experience, for example, the third preset range is set to 100ppm / h or 200ppm / h, and the preset duration is set to 1 hour or 2 hours, which is not specifically limited in this embodiment. After obtaining the variation amplitude of the carbon dioxide concentration value in the smoke chamber within a unit time, it is determined whether the variation amplitude is in the third preset range. When the variation amplitude is in the third preset range, the third duration may not be adjusted, that is, the baking process curve of the dry rib period remains unchanged. When the variation amplitude is not in the third preset range, the third duration is extended according to the preset duration until the variation amplitude is in the third preset range. For example, when the third preset range is set to 100ppm / h and the preset duration is set to 1 hour, if the variation amplitude of the obtained carbon dioxide concentration value is greater than 100ppm / h, the third duration is extended by 1 hour, that is, the baking time of the dry rib period is extended until the variation amplitude of the carbon dioxide concentration value is less than or equal to 100ppm / h, and the tobacco leaf baking is terminated.

[0047] Optionally, in the above embodiment, the control method further includes: An adjusted baking process curve is generated according to the adjusted first duration, second duration and third duration.

[0048] In the embodiment of the present invention, after the tobacco leaves are baked, an adjusted baking process curve is generated and stored according to the adjusted first duration, second duration and third duration for subsequent use.

[0049] The practical application results of the present application scheme are described below in conjunction with specific embodiments.

[0050] See also Figure 4, and combined with Figures 1 to 3 After the baking starts, the control computer 23 loads the experience baking program, wherein the experience baking program is provided with baking process curve parameters (yellowing period baking parameters: temperature 30-44°C, first duration 90 hours, first preset range 2 hours; color fixing period baking parameters: temperature 45-54°C, second duration 60 hours, second preset range 2 hours; dry period baking parameters: temperature 55-68°C, third duration 70 hours, third preset range 100ppm / h, preset duration 1 hour), and then the heating chamber 1, the circulating fan 2, the cold air door 3 and other equipment are regulated according to the detection data of the humidity sensor 10 and the temperature sensor 11 to meet the requirements of the baking process curve. At the same time, the carbon dioxide detection device is put into operation. First, the second valve 15 is opened, and the vacuum pump 16 extracts gas from the environment through the second sampling port 14 to calibrate the carbon dioxide detector 20. After the calibration is completed, the second valve 15 is closed, and the first valve 13 is opened. The smoke in the smoke chamber is extracted through the first sampling port 12. At this time, the reversing valve 17 is switched to the first outlet, and the third valve 21 and the fourth valve 22 are opened to remove the impurity gas in the exhaust pipe. After the airflow stabilizes, the third valve 21 and the fourth valve 22 are closed, and the reversing valve 17 is switched to the second outlet. The smoke enters the carbon dioxide detector 20 after passing through the dryer 18 and the filter 19, and the carbon dioxide concentration value in the smoke chamber is obtained and transmitted to the control computer 23. The control computer 23 draws the carbon dioxide concentration change curve in real time.

[0051] In the yellowing baking stage, the yellowing baking process parameters are loaded, and the first baking time corresponding to the extreme point of carbon dioxide concentration in the smoke loading room (the inflection point where the carbon dioxide concentration value starts to rise during the reduction process) is obtained in the late yellowing stage, such as Figure 3 As shown, the extreme point of carbon dioxide concentration appears at point A (near 90 hours), which coincides with the boundary point between the yellowing period and the color fixing period set in the baking program, that is, the difference between the first baking time and the set first duration is less than or equal to 2 hours. At this time, the baking program is kept unchanged and the baking enters the color fixing period; if the time point when the extreme point of carbon dioxide concentration appears does not coincide with the boundary point between the yellowing period and the color fixing period set in the baking program, that is, the difference between the first baking time and the set first duration is greater than 2 hours, it is necessary to adjust the baking program, extend or shorten the first duration to the first baking time corresponding to the extreme point of carbon dioxide concentration, and simultaneously adjust the operating parameters of the heating chamber 1, the circulating fan 2, the cold air door 3 and other equipment.

[0052] In the color fixing period baking stage, the color fixing period baking process parameters are loaded, and the second baking time corresponding to when the carbon dioxide concentration reaches the preset concentration value (environmental value) is obtained, such as Figure 3As shown, at point B (near 120 hours), the carbon dioxide concentration value approaches the ambient value and no longer changes. At this time, the corresponding second baking time is 30 hours, which coincides with the midpoint of the color fixing period set in the baking program, that is, the difference between the second baking time and half of the set second duration is less than or equal to 2 hours. At this time, the baking program is kept unchanged, and the drying period begins after the color fixing period is completed; if the time point when the carbon dioxide concentration value approaches the ambient value does not coincide with the midpoint of the color fixing period set in the baking program, that is, the difference between the second baking time and half of the set second duration is greater than 2 hours, it is necessary to adjust the baking program, extend or shorten the second duration to twice the second baking time, and simultaneously adjust the operating parameters of the heating chamber 1, circulating fan 2, cold air door 3 and other equipment.

[0053] In the dry rib baking stage, load the dry rib baking process parameters and obtain the change amplitude of the carbon dioxide concentration value, such as Figure 3 As shown, curve C represents the carbon dioxide concentration change curve obtained by the carbon dioxide detection point 3. The carbon dioxide concentration value detected by the carbon dioxide detection point 3 tends to the ambient value and no longer changes significantly. At this time, the baking program is kept unchanged, and the tobacco baking process is terminated after the dry tendon baking period is over; if the carbon dioxide concentration values ​​detected by all carbon dioxide detection points have large fluctuations, that is, the change amplitude of the carbon dioxide concentration value is greater than 100ppm / h, it is necessary to extend the third duration by 1 hour until the change amplitude of the carbon dioxide concentration value obtained by one carbon dioxide detection point is less than 100ppm / h, and the tobacco baking process can be terminated.

[0054] After the tobacco leaves are baked, an adjusted baking process curve is generated and stored according to the adjusted first duration, second duration and third duration for subsequent use.

[0055] The initially cured tobacco obtained by controlling the tobacco curing process by the control method for a tobacco curing system provided by an embodiment of the present invention is shown in Tables 1 to 4.

[0056] (1) Economic efficiency of primary flue-cured tobacco Table 1 Comparison of economic efficiency of first-cured tobacco

[0057] As can be seen from Table 1, the grade structure and average price of the first-cured tobacco after the tobacco curing process is controlled by the control method for tobacco curing system provided by the embodiment of the present invention are higher than those of the prior art. Among them, the proportion of top-grade tobacco is increased by 5.55% compared with the prior art, the proportion of medium-grade tobacco is increased by 4.64% compared with the prior art, the proportion of low-grade tobacco is reduced by 3.52% compared with the prior art, the proportion of out-of-grade tobacco is reduced by 6.76% compared with the prior art, and the average price of the first-cured tobacco is increased by 1.99 yuan / kg compared with the prior art.

[0058] (2) Appearance quality of first-cured tobacco Table 2 Evaluation results of the appearance quality of first-cured tobacco

[0059] As can be seen from Table 2, the total weight score of the appearance quality of the initially cured tobacco after the tobacco curing process is controlled by the control method for a tobacco curing system provided by an embodiment of the present invention is higher than that of the prior art, which is mainly reflected in that the tobacco leaves have a darker chroma and brighter color, and the oiliness of the leaf surface is better than that of the control curing room, and the amount of black slag tobacco, gray tobacco and other colored tobacco is significantly reduced, and the problems of dark color, stiffness and insufficient oil content of the cured tobacco are significantly improved.

[0060] (3) Chemical composition of first-cured tobacco Table 3 Analysis results of chemical components of first-cured tobacco

[0061] It can be seen from Table 3 that the chemical composition coordination of the initially cured tobacco after the tobacco baking process is controlled by the control method for a tobacco baking system provided by an embodiment of the present invention is better than that of the prior art, which is mainly reflected in the increase of reducing sugar and total sugar contents; the decrease of protein and starch contents, which is more conducive to the degradation and conversion of macromolecular substances such as protein and starch.

[0062] (4) Sensory quality evaluation of first-cured tobacco Table 4 Sensory quality evaluation results of first-cured tobacco

[0063] As can be seen from Table 4, the initial tobacco baked by controlling the tobacco baking process through the control method for a tobacco baking system provided by an embodiment of the present invention has certain improvements in aroma quality, impurities and irritation compared with the prior art, especially in the upper smoke, and the overall total score is improved by 1.5 points.

[0064] Therefore, the control method for a tobacco baking system provided in an embodiment of the present invention is used to control the tobacco baking process, which has better economy and baking quality than the prior art.

[0065] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other. It should also be noted that in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the element.

[0066] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for a tobacco leaf baking system, characterized in that: The tobacco leaf baking system comprises a tobacco loading chamber and a carbon dioxide detection device, and the control method comprises: Setting baking process curve parameters, wherein the baking process curve parameters include a first duration of a yellowing period and a second duration of a color fixing period, and the yellowing period includes an early yellowing period and a late yellowing period; Detecting the carbon dioxide concentration value in the smoke chamber by the carbon dioxide detection device; In the later stage of yellowing, obtaining a first baking time corresponding to the inflection point at which the carbon dioxide concentration value starts to rise, and adjusting the first continuous time according to the first baking time; During the color fixing period, a second baking time corresponding to when the carbon dioxide concentration reaches a preset concentration value is obtained, and the second continuous time is adjusted according to the second baking time.

2. The control method for a tobacco leaf baking system according to claim 1, characterized in that: The adjusting the first duration according to the first baking duration includes: determining whether a first difference between the first toasting time and the first continuous time is within a first preset range; When the first difference is not within the first preset range, the first duration is adjusted to the first baking duration.

3. The control method for a tobacco leaf baking system according to claim 1, characterized in that: The second duration is adjusted according to the second baking duration, including: determining whether a second difference between the second toasting time and half of the second duration is within a second preset range; When the second difference is not within the second preset range, the second duration is adjusted to twice the second baking duration.

4. The control method for a tobacco leaf baking system according to claim 1, characterized in that: The baking process curve parameter also includes a third duration of the dry rib period, and the control method further includes: During the dry period, obtaining a change amplitude of the carbon dioxide concentration value; The third duration is adjusted according to the change amplitude.

5. The control method for a tobacco leaf baking system according to claim 4, characterized in that: The adjusting the third duration according to the change amplitude includes: Determining whether the change amplitude is within a third preset range; When the change amplitude is not within the third preset range, the third duration is extended according to a preset duration until the change amplitude is within the third preset range.

6. The control method for a tobacco leaf baking system according to claim 4, characterized in that: The control method further comprises: An adjusted baking process curve is generated according to the adjusted first duration, the second duration and the third duration.

7. The control method for a tobacco leaf baking system according to claim 1, characterized in that: The carbon dioxide detection device comprises a first sampling port arranged in the smoke chamber, and an air extraction pump and a carbon dioxide detector which are sequentially connected to the first sampling port.

8. The control method for a tobacco leaf baking system according to claim 7, characterized in that: The carbon dioxide detection device also includes a second sampling port arranged outside the smoke chamber, and the second sampling port is connected to the air extraction pump.

9. The control method for a tobacco leaf baking system according to claim 8, characterized in that: The carbon dioxide detection device also includes a reversing valve and a discharge port, the inlet of the reversing valve is connected to the air pump, the first outlet of the reversing valve is connected to the discharge port, and the second outlet of the reversing valve is connected to the carbon dioxide detector.

10. A tobacco leaf baking system, characterized in that: include: Install smoke chamber; A carbon dioxide detection device, used to detect the carbon dioxide concentration value in the smoke loading chamber; Wherein, the tobacco leaf baking system uses the control method for a tobacco leaf baking system according to any one of claims 1 to 9 to control the tobacco leaf baking process.

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