A method for uninterrupted moisture removal during the color fixing period of tobacco leaf curing

Abstract

The application discloses a method for uninterrupted moisture removal in a color fixing period of tobacco leaf baking, which comprises the following steps: loading the tobacco leaf into a dense baking room according to requirements, wherein the dense baking room comprises a cold air inlet door, and the cold air inlet door is provided with an openable and closable air inlet hole; baking the tobacco leaf according to a three-section dense baking process, and opening the air inlet hole uninterruptedly during the period from the late yellowing stage of the tobacco leaf baking to the end of the baking. Compared with the existing three-section dense baking process, the application can reduce the occurrence rate of dusting, steaming and red baking to a certain extent, and the loss of single-baking tobacco can be reduced by about 9 Jin, and the economic benefit can be increased by about 100 yuan.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of tobacco leaf baking fixation period uninterrupted moisture removal method, belong to tobacco baking technical field. BACKGROUND

[0002] Baking dense tobacco barn is used for baking tobacco leaf. Dense tobacco barn is indispensable infrastructure for promoting the scale, intensification and specialization of flue-cured tobacco production. In the past decade, the technology of dense baking has made rapid progress in China. Compared with ordinary baking barn, dense baking barn has obvious advantages such as energy saving, labor saving and improvement of overall baking quality of tobacco leaf, and three-stage dense baking process has been widely promoted.

[0003] However, the applicant found at least the following problems in the existing tobacco baking: 1. Brown reaction occurs in the tip and edge of part of the tobacco leaf during the late fixation period, and even causes large area of ash, steaming and other baking failure; 2. It is easy to cause non-human factors to bake red tobacco during the dry stem period. SUMMARY

[0004] Based on the above, the present application provides a kind of tobacco leaf baking fixation period uninterrupted moisture removal method, by adding uninterrupted air inlet hole on existing baking facilities, opening uninterrupted air inlet hole during the late yellowing period to the end of baking to overcome the shortcomings of the prior art.

[0005] The technical scheme of the present application is: a kind of tobacco leaf baking fixation period uninterrupted moisture removal method, comprising:

[0006] The tobacco leaf is loaded into the dense baking barn according to the requirements, the dense baking barn comprises a cold air inlet door, and the cold air inlet door is provided with an openable and closable air inlet hole;

[0007] The tobacco leaf is baked according to the three-stage dense baking process, and the uninterrupted air inlet hole is opened during the late yellowing period of the tobacco leaf baking to the end of baking.

[0008] Preferably, the three-stage dense baking process is as follows:

[0009] S1, ignition, increase the temperature of the baking barn to 33℃ at 1℃ / h, keep the wet bulb temperature at 33℃, stabilize for 6h, and preheat the tobacco leaf;

[0010] S2, increase the temperature of the baking barn to 38℃ at 1℃ / 2h, keep the wet bulb temperature at 37-38℃, stabilize for 12h-20h, until the tip of the high-temperature layer is yellowed by 10cm;

[0011] S3, increase the temperature of the baking barn to 40℃ at 1℃ / 2h, keep the wet bulb temperature at 37-38℃, stabilize for 16h-30h, until the whole hearth is 7-8 yellow and the leaf is soft;

[0012] S4, increase the temperature of the curing barn to 40℃ at 1℃ / 2h, keep the wet bulb temperature at 36-36.5℃, and stabilize the temperature for 4-8h, until the whole curing bed is 80% yellow, the high-temperature layer is partly hooked and curled, and the non-stop air inlet hole is opened;

[0013] S5, increase the temperature of the curing barn to 42℃ at 1℃ / 3h, keep the wet bulb temperature at 36℃, and stabilize the temperature for 16-30h, until the tobacco leaves are yellow with green veins, the main veins are soft, the high-temperature layer is hooked and curled, and the non-stop air inlet hole is opened;

[0014] S6, increase the temperature of the curing barn to 46℃ at 1℃ / 3h, keep the wet bulb temperature at 36℃, and stabilize the temperature for 8-20h, until the leaf ears are yellow, the branch veins are white, the high-temperature layer is small curled cylinder soft, the low-temperature layer is basically small curled cylinder, and the non-stop air inlet hole is opened;

[0015] S7, increase the temperature of the curing barn to 50℃ at 1℃ / 2h, keep the wet bulb temperature at 37℃, and stabilize the temperature for 6-12h, until the main veins are broken green, and the non-stop air inlet hole is opened;

[0016] S8, increase the temperature of the curing barn to 54℃ at 1℃ / h, keep the wet bulb temperature at 38℃, and stabilize the temperature for 10-12h, until the whole curing bed reaches large curled cylinder, and the non-stop air inlet hole is opened;

[0017] S9, increase the temperature of the curing barn to 60℃ at 1℃ / h, keep the wet bulb temperature at 40℃, and stabilize the temperature for 6-8h, until the main veins are purple and contracted, and the non-stop air inlet hole is opened;

[0018] S10, increase the temperature of the curing barn to 68℃ at 1℃ / h, keep the wet bulb temperature at 41℃, and stabilize the temperature for 25-30h, until the tobacco veins are completely dry, and the non-stop air inlet hole is opened.

[0019] Preferably, the air inlet hole is a circular or square hole with a diameter or side length of 4cm, 5cm, or 6cm.

[0020] The development process of the present application: there are many cases of brown reaction of cured tobacco leaves, through the gradual investigation of the applicant, it is found that if the actual humidity in the curing room is lower than the set target humidity for a long time in the late color fixing stage, the exhaust system of the curing room does not always progress cold air (the current air inlet door of the intensive curing room is opened and closed only by the wet bulb temperature). It is found in actual curing that this will cause the tip and edge of part of the tobacco leaves to undergo brown reaction during this period, and even cause large area of ash hanging, steaming and other bad curing. Further investigation found that the current curing control equipment controls the humidity in the curing room in an intermittent exhaust mode, and the exhaust process is interrupted, which will cause large fluctuations in the humidity in the curing room. From the end of each exhaust to the start of the next exhaust when the target humidity is reached again, the humidity in the curing room continues to rise until the set target humidity is reached, and then the exhaust starts again. The reason for the red curing is that due to the hot weather during the curing season, the dry bulb temperature often exceeds the target value for a long time, causing non-human factors to cause red curing. Further investigation found that after the actual humidity in the curing room is lower than the set target humidity for a long time during the dry muscle period, the exhaust system does not always progress cold air, and the heating system cannot stop heating immediately, so that the dry bulb temperature exceeds the target value for a long time. Ultimately, the applicant determines that the main cause of the above situation is: the design defect of the curing main control instrument causes large fluctuations in humidity during the exhaust process of the curing room and the dry bulb temperature exceeds the target value for a long time, thereby affecting the quality of tobacco curing. In view of this reason, the applicant puts forward the solution idea: the existing curing facilities are slightly modified, and an uninterrupted air inlet hole is added to the cold air inlet door; the small hole is opened from the late yellowing period of tobacco curing to the end of curing, thereby making up for the design defect of the automatic control instrument, avoiding ash hanging caused by humidity fluctuations in the curing room, and saving energy.

[0021] The beneficial effects of the present application: the present application slightly modifies the existing curing facilities, adds an uninterrupted air inlet hole to the cold air inlet door, and opens the small hole from the late yellowing period of tobacco curing to the end of curing for uninterrupted exhaust. First, it effectively avoids the current mainstream large-scale intensive curing room, which causes the humidity in the curing room to continuously rise until the set target humidity is reached after each exhaust ends to the start of the next exhaust when the target humidity is reached again, and then the exhaust starts again, effectively solving the problem that the current three-stage intensive curing process is prone to cause the tip and edge of part of the tobacco leaves to undergo brown reaction during the late color fixing period, and even cause large area of ash hanging, steaming and other bad curing. Second, it effectively avoids the situation that during the dry muscle period, the actual humidity in the curing room is lower than the set target humidity for a long time, the exhaust system does not always progress cold air, and the heating system cannot stop heating immediately, which causes the dry bulb temperature to exceed the target value for a long time, causing non-human factors to cause red curing, and at the same time, it can reduce certain energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The schematic view of the modified cold air inlet door;

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Cold air inlet door, 2. Air inlet hole, 3. Perforated plate. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Example 1

[0027] A method for continuous dehumidification during the tobacco leaf curing and color-fixing period includes the following steps:

[0028] S1. Load the tobacco leaves into the intensive curing barn as required. The tobacco leaves are Yunyan 87. The intensive curing barn includes a cold air inlet door 1. (Refer to...) Figure 1 The cold air inlet door 1 is equipped with an air inlet 2 that can be opened and closed. The air inlet 2 is a square with a side length of 5 cm. A movable perforated plate 3 is installed on the air inlet 2 to realize the opening and closing operation of the air inlet 2.

[0029] S2, ignite, raise the temperature of the curing barn to 33℃ at a rate of 1℃ / h, maintain the wet bulb temperature at 33℃, and keep the temperature stable for 6 hours to preheat the tobacco leaves;

[0030] S3, raise the oven temperature to 38℃ at 1℃ / 2h, maintain the wet bulb temperature at 38℃, stabilize the temperature for 12h, until the leaf tips of the high-temperature layer turn yellow by 10cm.

[0031] S4, raise the oven temperature to 40℃ at 1℃ / 2h, maintain the wet bulb temperature at 38℃, keep the temperature stable for 20h, until the whole oven is 70-80% yellow and the leaves are soft;

[0032] S5, raise the oven temperature to 40℃ at 1℃ / 2h, maintain the wet bulb temperature at 36.5℃, stabilize the temperature for 6h, until the whole oven is 80% yellow, the high temperature layer is hooked and curled, and the continuous air inlet 2 is opened.

[0033] S6, raise the curing room temperature to 42℃ at 1℃ / 3h, maintain the wet bulb temperature at 36℃, stabilize the temperature for 20h, until the tobacco leaves reach yellow leaves with green veins, the main veins soften, the high temperature layer hooks and curls the edges, and open the continuous air inlet 2.

[0034] S7, raise the oven temperature to 46℃ at 1℃ / 3h, maintain wet bulb temperature at 36℃, stabilize temperature for 12h, until the leaf ear turns yellow, the branch veins turn white, the high temperature layer small roll is soft, the low temperature layer is basically a small roll, open the continuous air inlet 2.

[0035] S8, raise the oven temperature to 50℃ at 1℃ / 2h, maintain the wet bulb temperature at 37℃, stabilize the temperature for 10h, until the main vein breaks the green, and open the continuous air inlet 2.

[0036] S9, raise the oven temperature to 54℃ at 1℃ / h, maintain the wet bulb temperature at 38℃, stabilize the temperature for 10h, until the entire oven reaches the large roll, and open the continuous air inlet 2.

[0037] S10, raise the oven temperature to 60℃ at 1℃ / h, maintain the wet bulb temperature at 40℃, stabilize the temperature for 8h, until the main vein turns purple and shrinks, then open the continuous air inlet 2.

[0038] S11, raise the curing oven temperature to 68℃ at 1℃ / h, maintain the wet bulb temperature at 41℃, stabilize the temperature for 25 hours until the tobacco is completely dry, and open the continuous air inlet 2.

[0039] Compare with Example 1:

[0040] The tobacco leaves are cured using the existing three-stage intensive curing process, including the following steps:

[0041] S1. Load the tobacco leaves into the intensive curing barn as required. The tobacco leaves are Yunyan 87.

[0042] S2, ignite, raise the temperature of the curing barn to 33℃ at a rate of 1℃ / h, maintain the wet bulb temperature at 33℃, and keep the temperature stable for 6 hours to preheat the tobacco leaves;

[0043] S3, raise the oven temperature to 38℃ at 1℃ / 2h, maintain the wet bulb temperature at 38℃, stabilize the temperature for 12h, until the leaf tips of the high-temperature layer turn yellow by 10cm.

[0044] S4, raise the oven temperature to 40℃ at 1℃ / 2h, maintain the wet bulb temperature at 38℃, keep the temperature stable for 20h, until the whole oven is 70-80% yellow and the leaves are soft;

[0045] S5, raise the oven temperature to 40℃ at 1℃ / 2h, maintain the wet bulb temperature at 36.5℃, stabilize the temperature for 6h, until the whole oven is 80% yellow, and the high-temperature layer has hooked tips and curled edges.

[0046] S6, raise the curing room temperature to 42℃ at 1℃ / 3h, maintain the wet bulb temperature at 36℃, stabilize the temperature for 20h, until the tobacco leaves reach the state of yellow leaves with green veins, the main vein softens, and the high-temperature layer has hooked tips and curled edges.

[0047] S7, raise the oven temperature to 46℃ at 1℃ / 3h, maintain the wet bulb temperature at 36℃, stabilize the temperature for 12h, until the leaf ear turns yellow, the branch veins turn white, the small rolls in the high temperature layer are soft, and the small rolls in the low temperature layer are basically small rolls.

[0048] S8, raise the oven temperature to 50℃ at 1℃ / 2h, maintain the wet bulb temperature at 37℃, stabilize the temperature for 10h, until the main vein breaks the green color;

[0049] S9, raise the oven temperature to 54℃ at 1℃ / h, maintain the wet bulb temperature at 38℃, stabilize the temperature for 10 hours, until the entire oven reaches the large roll.

[0050] S10, raise the oven temperature to 60℃ at 1℃ / h, maintain the wet bulb temperature at 40℃, keep the temperature stable for 8 hours, until the main vein turns purple and shrinks;

[0051] S11, raise the curing room temperature to 68℃ at a rate of 1℃ / h, maintain the wet bulb temperature at 41℃, and keep the temperature stable for 25 hours until the tobacco fibers are completely dry.

[0052] Five batches of Yunyan 87 were treated according to Example 1 and Control Example 1. Except for whether the continuous air inlet 2 was opened, the structure and baking process of the intensive baking room were exactly the same. After baking, the grade (downgraded in the table), unit price reduction, weight and amount were counted due to ash accumulation downgrading. The table below shows the baking comparison between continuous dehumidification (Example 1) and conventional dehumidification (Control Example 1) processes.

[0053] Table 1 Comparison of Baking Results

[0054]

[0055]

[0056] Note: The unit price in the table is reduced in yuan, the weight is in jin (a Chinese unit of weight), and the amount is yuan.

[0057] As shown in the table above, based on the total weight of five kilns, the weight of the present invention after downgrading due to ash residue is 142.4 jin (approximately 71.6 catties), while the weight of the control example after downgrading due to ash residue is 186.5 jin (approximately 93.65 kg), a difference of 44.1 jin (approximately 22.6 catties) and a difference in monetary value of 493.73 yuan. On average, the weight of the present invention after downgrading due to ash residue is 28.48 jin (approximately 19.68 catties), while the weight of the control example after downgrading due to ash residue is 37.3 jin (approximately 18.65 catties), a difference of 8.82 jin (approximately 4.96 catties) and a difference in monetary value of 98.746 yuan. Therefore, compared with the existing three-stage intensive curing process, the present invention can reduce the incidence of ash residue, steaming, and red tobacco curing to a certain extent, reducing the loss of tobacco per kiln by approximately 9 jin (approximately 4.5 kg) and increasing economic benefits by approximately 100 yuan.

[0058] Calculations show that after adopting this invention, the proportion of ash-laden smoke in the tobacco-growing areas of Fuquan City decreased by 1.1%. With 500 curing barns, each barn handles an average of 5 curing sessions per season, with an average of 8 dan (a unit of weight) of smoke per session, totaling 40 dan. The amount of ash-laden smoke per session decreased by 0.0882 dan, resulting in a total reduction of 220.5 dan. Based on the downgrading losses caused by ash-laden smoke, the average reduction in losses due to ash-laden smoke per session is 98.75 yuan, totaling 246,875 yuan. Electricity consumption is reduced by 20.8 kWh per session, totaling 52,000 kWh. Biomass pellet fuel consumption is reduced by 28 kg per session, totaling 70,000 kg. After full implementation in Fuquan City, with 1200 curing barns, the calculated reduction in losses is 592,500 yuan. The total reduction in electricity consumption is 124,800 kWh, and biomass pellet fuel consumption is 168,000 kg.

[0059] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for uninterrupted moisture removal during the color fixing period of tobacco curing, characterized by, The application relates to a three-section dense baking process for tobacco leaves. The three-section dense baking process is as follows: S1, ignition, the temperature of the baking room is increased to 33 DEG C at a speed of 1 DEG C / h, the wet bulb temperature is kept at 33 DEG C, and the temperature is kept stable for 6 h to preheat the tobacco leaves; S2, the temperature of the baking room is increased to 38 DEG C at a speed of 1 DEG C / 2h, the wet bulb temperature is kept at 37-38 DEG C, and the temperature is kept stable for 12-20 h until the leaf tip of the high-temperature layer is yellow by 10 cm; S3, the temperature of the baking room is increased to 40 DEG C at a speed of 1 DEG C / 2h, the wet bulb temperature is kept at 37-38 DEG C, and the temperature is kept stable for 16-30 h until the whole baking layer is yellow by 70-80%, and the leaf blade is soft; S4, the temperature of the baking room is increased to 40 DEG C at a speed of 1 DEG C / 2h, the wet bulb temperature is kept at 36-36.5 DEG C, and the temperature is kept stable for 4-8 h until the whole baking layer is yellow by 80%, and the high-temperature layer is partially hooked and curled, and the uninterrupted air inlet hole (2) is opened; S5, the temperature of the baking room is increased to 42 DEG C at a speed of 1 DEG C / 3h, the wet bulb temperature is kept at 36 DEG C, and the temperature is kept stable for 16-30 h until the tobacco leaves reach the yellow blade and green veins, the main vein is soft, the high-temperature layer is hooked and curled, and the uninterrupted air inlet hole (2) is opened; S6, the temperature of the baking room is increased to 46 DEG C at a speed of 1 DEG C / 3h, the wet bulb temperature is kept at 36 DEG C, and the temperature is kept stable for 8-20 h until the leaf ear is yellow, the branch vein is white, the high-temperature layer is small curled cylinder soft, the low-temperature layer is basically small curled cylinder, and the uninterrupted air inlet hole (2) is opened; S7, the temperature of the baking room is increased to 50 DEG C at a speed of 1 DEG C / 2h, the wet bulb temperature is kept at 37 DEG C, and the temperature is kept stable for 6-12 h until the main vein is broken green, and the uninterrupted air inlet hole (2) is opened; S8, the temperature of the baking room is increased to 54 DEG C at a speed of 1 DEG C / h, the wet bulb temperature is kept at 38 DEG C, and the temperature is kept stable for 10-12 h until the whole baking layer reaches the large curled cylinder, and the uninterrupted air inlet hole (2) is opened; S9, the temperature of the baking room is increased to 60 DEG C at a speed of 1 DEG C / h, the wet bulb temperature is kept at 40 DEG C, and the temperature is kept stable for 6-8 h until the main vein is purple and shrunk, and the uninterrupted air inlet hole (2) is opened; S10, the temperature of the baking room is increased to 68 DEG C at a speed of 1 DEG C / h, the wet bulb temperature is kept at 41 DEG C, and the temperature is kept stable for 25-30 h until the tobacco muscle is completely dried, and the uninterrupted air inlet hole (2) is opened. The air inlet hole (2) is a circle or square with a diameter or side length of 4 cm, 5 cm or 6 cm. ​ 2. The method of claim 1, wherein the tobacco curing is performed without interruption of the moisture removal at the fixed curing stage. ​

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