A processing technology for conveniently adjusting stem filling value

Abstract

The present application relates to a kind of processing technology for adjusting stem filling value, in stem expansion process, initial reference processing parameter group is selected in advance, including the moisture content C0 of stem, and the pressure A0 of expansion process gas and steam pressure air ratio B0, corresponding stem filling value is Y0, stem filling value is regulated by following regulation mode: S1, when the stem filling value Y required Y is greater than Y0, one or more combinations of the following three measures is used: on the basis of B0, steam pressure air ratio is adjusted to increase;On the basis of A0, expansion process gas pressure is adjusted to increase;On the basis of C0, import material moisture content is adjusted to increase;S2, when the stem filling value Y required Y is less than Y0, one or more combinations of the following three measures is used: on the basis of B0, steam pressure air ratio is adjusted to decrease;On the basis of A0, expansion process gas pressure is adjusted to decrease;On the basis of C0, import material moisture content is adjusted to decrease.

Description

Technical Field

[0001] This invention relates to the field of tobacco processing technology, and more specifically to a processing technology that facilitates the adjustment of the stem filling value. Background Technology

[0002] Tobacco stems are an important component of tobacco leaves. Through various processing steps, tobacco stems can support the tobacco fibers. Tobacco fibers are one of the filling materials for cigarettes. Their function is to reduce the tar content of cigarettes, improve the filling properties of cigarettes, and improve the burning speed of cigarettes.

[0003] The Expandable Stem Fill Value (ESFV) is an indicator of the fill power of cigarette stems after expansion treatment. It is one of the important indicators of cigarette quality. Generally, the higher the ESFV, the higher the quality of the cigarette.

[0004] Currently, the processing flow of tobacco stems generally includes multiple steps such as: feeding tobacco stems → washing stems → storing stems → heating tobacco stems → pressing stems → cutting stems → adding stem shreds → stem expansion → drying stem shreds. Existing processes typically increase the filling value of expanded stem shreds by adjusting the storage time, cutting width, steaming temperature, hot air temperature, and damper opening. Patent application CN201510086990.X provides a method for processing tobacco stems to obtain a high filling value. This method adds a stem humidification and dehydration step between the stem cutting and feeding steps, followed by feeding, drying, and subsequent processing, achieving a filling value greater than 10.0 cm. 3 / g of stem fibers. However, this process adds several steps to the existing process, making it complex and energy-intensive.

[0005] A utility model patent with application number CN201621176146.2 discloses a spiral guide device for a tobacco drying machine to improve the filling value of tobacco stems after drying. This device features guide vanes at the front of a venturi tube and guide vanes at 120° angles evenly distributed across the same cross-section in the middle of the venturi tube. This reduces scale buildup and increases the stem expansion rate and filling value. However, this process consumes a large amount of energy and requires sophisticated equipment. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a processing technology that facilitates the adjustment of the stem filling value, which can achieve a large range of control over the stem filling value without changing the existing process, and the process is simple.

[0007] To achieve the above objectives, the present invention provides a processing technology that facilitates the adjustment of the filament filling value, including a filament expansion step. In this step, an expansion process gas is used to heat and humidify the filaments. The expansion process gas includes steam and compressed air, with a steam-to-air ratio. In the filament expansion step, an initial set of reference processing parameters is pre-selected, including the moisture content C0 of the incoming filaments, the pressure A0 of the expansion process gas, and the steam-to-air ratio B0. The filament filling value corresponding to the initial set of reference processing parameters is Y0. The filament filling value is adjusted using the following control methods:

[0008] S1. When the required wire filling value Y is greater than Y0, one or more of the following three measures shall be adopted:

[0009] Based on B0, increase the steam pressure-air ratio; based on A0, increase the expansion process gas pressure; based on C0, increase the moisture content of the inlet material.

[0010] S2. When the required wire filling value Y is less than Y0, one or more of the following three measures shall be adopted:

[0011] Based on B0, adjust the steam pressure-air ratio to decrease; based on A0, adjust the expansion process gas pressure to decrease; based on C0, adjust the moisture content of the inlet material to decrease.

[0012] Furthermore, in the initial baseline processing parameters, the pressure of the expansion process gas A0 is 1.9 to 2.3 Bar, the vapor pressure-air ratio B0 is 1.5 to 2.5, and the moisture content of the incoming filaments C0 is 31.5% to 32.5%.

[0013] Furthermore, in control modes S1 and S2, the pressure A of the expansion process gas is adjusted between 1.5 and 3.0 Pa, the steam pressure-air ratio B is adjusted between 0.25 and 4, and the moisture content C of the incoming wire is adjusted between 29.0% and 34.0%.

[0014] Furthermore, in control methods S1 and S2, when the difference between the required filament filling value Y mesh and Y0 is greater than or equal to 0.3 cm3 / g, the following adjustment is made: first, only the steam pressure-air ratio A is adjusted. If Y mesh cannot be obtained by adjusting the steam pressure-air ratio alone, then the steam pressure-air ratio B and pressure A are adjusted simultaneously. If Y mesh still cannot be obtained by adjusting the steam pressure-air ratio B and pressure A, then the steam pressure-air ratio B, pressure A, and the moisture content of the incoming material C are adjusted simultaneously.

[0015] Furthermore, in methods S1 and S2, when the difference between the required wire filling value Y mesh and Y0 is less than 0.3 cm3 / g, the following adjustment is made: first, only one of the measures, adjusting pressure A or adjusting steam pressure-air ratio B, is used. If Y mesh cannot be obtained by using only one measure, then both the measures of adjusting pressure A and steam pressure-air ratio B are used simultaneously.

[0016] As described above, the processing technology of the present invention, which facilitates the adjustment of the stem filling value, has the following beneficial effects:

[0017] 1. By selecting control method S1 or S2 in the stem expansion process, the filling value of the stem can be effectively controlled without changing the existing process. It is simple and convenient, the control method is easy and controllable, and the energy consumption requirements of the equipment are low.

[0018] 2. When carrying out regulation, select three measures according to the required stalk filling value in a certain order and manner, and fully consider the operational difficulty and adjustment range of the regulation measures to ensure the overall difficulty and cost of the regulation work while ensuring the regulation objective.

[0019] 3. The stem filling value has a wide adjustment range, which can be adjusted between 4.23cm3 / g and 5.82cm3 / g, with an adjustment range of 38%. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the processing technology of the present invention.

[0021] Figure 2 This is a schematic diagram of the process for adjusting the stem filling value in the stem expansion process of the present invention. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0023] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0024] See Figures 1 to 2 This invention provides a processing technology that facilitates the control of tobacco stem filling value, including multiple steps such as tobacco stem feeding → washing stems → storing stems → heating and humidifying tobacco stems → pressing stems → cutting stems → adding stem fibers → stem expansion → drying stem fibers. In the stem expansion step, an expansion process gas is used to heat and humidify the stem fibers. The expansion process gas includes steam and compressed air, and the volume ratio of steam to compressed air is denoted as the steam-air ratio. In the stem expansion step, an initial set of baseline processing parameters is selected beforehand, including the moisture content of the incoming stem fibers (C0), the pressure of the expansion process gas (A0), and the steam-air ratio (B0). The stem filling value corresponding to the initial baseline processing parameters is Y0. The initial baseline processing parameters can be set in the process design or selected from the historical production process data of the original process.

[0025] In the stem expansion process, the stem filling value is adjusted using the following methods:

[0026] S1, when the required filament filling value Y 目 When the value is greater than Y0, one or more of the following three measures shall be adopted: increase the steam pressure-air ratio based on B0; increase the expansion process gas pressure based on A0; increase the moisture content of the inlet material based on C0.

[0027] S2, when the required filament filling value Y 目 When the value is less than Y0, one or more of the following three measures are adopted: adjust the steam pressure-air ratio to decrease based on B0; adjust the expansion process gas pressure to decrease based on A0; adjust the moisture content of the inlet material to decrease based on C0.

[0028] The STS (steam treated stem) process for stem expansion uses a venturi tube to expand the stem. Since the expansion process gas is a mixture of steam and compressed air, a large amount of expansion process gas is used to heat and humidify the stem in the contraction section of the venturi tube. After being heated and humidified, the stem quickly passes through the throat of the venturi tube into the expansion section under the high pressure of the expansion process gas. At this time, due to the instantaneous drop in external pressure, the partial pressure of water in the stem cells is much higher than that of external pressure. The water in the cells is quickly converted into water vapor, thereby achieving the effect of stem expansion. The principle of regulating the filling value of the stem by adjusting the three parameters of material moisture content C, pressure A and steam pressure-air ratio B is as follows: (1) When the pressure A and steam pressure-air ratio B of the expansion process gas remain unchanged, by increasing the moisture content C of the inlet material, more water will be converted into water vapor in the stem cells after the material enters the expansion tube through the venturi throat, thereby improving the expansion effect of the stem. Conversely, when the moisture content C of the inlet material is reduced, the effect is reduced. (2) When the moisture content C and steam pressure-air ratio B are constant, by increasing the pressure A of the expansion process gas, the temperature, moisture content and pressure of the stem in the contraction tube section are increased, further increasing the partial pressure of water in the stem cells. After the material enters the expansion tube through the throat of the Venturi tube, there is more water in the stem cells, and the conversion rate of water vapor is faster, thereby improving the expansion effect of the stem. When the pressure A of the expansion process gas is reduced, the effect is the opposite, which can reduce the expansion effect of the stem; (3) When the moisture content C of the incoming material and the pressure A are constant, if the steam pressure air ratio B is increased, the speed of the stem passing through the Venturi tube remains unchanged, but the temperature and moisture content of the stem in the contraction section will increase. After the material enters the expansion tube through the throat of the Venturi tube, there is more water in the stem cells, and the conversion rate of water vapor is faster, thereby improving the expansion effect of the stem. When the steam pressure air ratio B is reduced, the effect is the opposite, which can reduce the expansion effect of the stem.

[0029] The processing technology of the present invention can effectively control the filling value of the stem by selecting control mode S1 or S2 in the stem expansion process. It does not require changes to the existing process, is simple and convenient, the control method is convenient and controllable, and has low requirements for equipment energy consumption.

[0030] As a preferred design, the initial baseline processing parameters include an expansion process gas pressure A0 of 1.9–2.3 Bar, a vapor pressure-to-air ratio B0 of 1.5–2.5, and an incoming stem moisture content C0 of 31.5%–32.5%. Specifically, in this embodiment, the pressure A0 is 2.1 Bar, the vapor pressure-to-air ratio B0 is 2:1, and the incoming stem moisture content C0 is 32.0%, corresponding to a stem filling value Y0 of 5.2 cm. 3 / g, to serve as a reference basis for regulation.

[0031] In the stem expansion process, the pressure A0 of the expansion process gas and the steam-air ratio B0 should not be too high or too low. Too high a pressure A0 places high demands on the equipment and increases the degree of stem breakage, affecting stem consumption. Too low a pressure A0 can lead to Venturi tube blockage. Too high a steam-air ratio B0 increases energy costs and produces condensate at the Venturi tube outlet, increasing stem wet clumps and affecting stem quality. Too low a moisture content B0 reduces the sensory quality of the stems and increases woody odor. Too high a moisture content C in the inlet material also increases the proportion of stem wet clumps, affecting stem quality. Too low a moisture content C affects the stem pressing effect, increases stem breakage, and affects stem consumption. In this embodiment, as a preferred design, in control methods S1 and S2, the pressure A of the expansion process gas is adjusted between 1.5 Bar and 3.0 Bar, the steam-air ratio B is adjusted between 0.25 and 4, and the moisture content C of the incoming stems is adjusted between 29.0% and 34.0%. This ensures the normal and stable operation of the process while effectively controlling the stem filling value, achieving a stem filling value of 4.4cm. 3 / g to 5.8cm 3 The adjustment range is within / g, with a high adjustment amplitude.

[0032] In this embodiment, as a preferred design, in control methods S1 and S2, when the required filament filling value Y... 目 The difference between Y0 and Y0 is greater than or equal to 0.3cm. 3 When the value is / g, it indicates a large adjustment range is required. In this case, adjustments should be made as follows: Initially, only the steam pressure-air ratio B can be used. Because changes in the steam pressure-air ratio B result in large changes in the wire filling value, adjustments can be made quickly, and operation is simple when only one method is used. However, since the adjustment range of the steam pressure-air ratio B is limited, Y cannot be obtained simply by adjusting the steam pressure-air ratio. 目 When the steam pressure-air ratio is adjusted between 0.25 and 4, Y cannot be obtained. 目 In this case, both the steam pressure-air ratio B and the pressure A are adjusted simultaneously. Only the parameters of the expansion process gas need to be adjusted; the moisture content C of the feed material does not need to be adjusted. However, since the adjustment range of pressure A is also limited, Y cannot be obtained simply by simultaneously adjusting the steam pressure-air ratio B and pressure A. 目 At this time, measures such as adjusting the steam pressure-air ratio B, pressure A, and feed moisture content C are simultaneously adopted to obtain a large adjustment range. Through the above methods, based on the desired filament filling value Y... 目 The three measures should be selected in a certain order and manner, taking into full consideration the adjustment range and operational difficulty of the control measures, so as to ensure the overall difficulty and cost of the control work while ensuring the control objectives.

[0033] In this embodiment, as a preferred design, in control methods S1 and S2, when the required filament filling value Y... 目The difference between Y0 and Y0 is less than 0.3cm. 3 When the value is / g, it indicates that the required adjustment range is small. In this case, adjustments should be made as follows: First, use only one method—adjusting pressure A or steam pressure-air ratio B—as both are relatively easy to adjust, making operation convenient. However, since the adjustment range of adjusting pressure A or steam pressure-air ratio B alone is limited, using only one method will not yield the desired result for Y. 目 At the same time, by simultaneously adjusting pressure A and vapor pressure-air ratio B, only the parameters of the expansion process gas need to be adjusted, and since the difference with Y0 is less than 0.3cm... 3 / g of stem filling value Y 目 The pressure is basically within the range achievable by simultaneously adjusting both pressure A and steam pressure-air ratio B, therefore, there is no need to adjust the feed moisture content C. Using the above method, the desired wire filling value Y is determined. 目 The three measures should be selected in a certain order and manner, taking into full consideration the operational difficulty and adjustment range of the control measures, so as to ensure the overall difficulty and cost of the control work while ensuring the control objectives.

[0034] In this invention, single-factor experiments and analyses are used to analyze the influence of the raw material moisture content (C), the pressure (A) of the expansion process gas, and the steam-air ratio (B) on the filling value (Y) of the filaments. Through orthogonal experimental results and analysis, it is determined that the steam-air ratio (B) has the greatest impact on the filling value, with its level causing data fluctuations accounting for 50.9% of the total sum of squares. The second largest influence is the raw material moisture content (C), contributing 36.5%, but adjusting the raw material moisture content (C) is relatively difficult. The pressure (A) has the smallest impact on the filling value, contributing 9.6%. Therefore, in the above specific adjustment methods, the operational difficulty and adjustment range of the control measures are fully considered comprehensively, ensuring both the control objectives and the overall difficulty and cost of the control work.

[0035] As can be seen from the above, the processing technology of the present invention, which facilitates the adjustment of the stem filling value, has the following beneficial effects:

[0036] 1. By selecting control method S1 or S2 in the stem expansion process, the filling value of the stem can be effectively controlled without changing the existing process. It is simple and convenient, the control method is easy and controllable, and the energy consumption requirements of the equipment are low.

[0037] 2. When carrying out regulation, select three measures according to the required stalk filling value in a certain order and manner, and fully consider the operational difficulty and adjustment range of the regulation measures to ensure the overall difficulty and cost of the regulation work while ensuring the regulation objective.

[0038] 3. The stem filling value has a wide adjustment range, which can be adjusted between 4.23cm3 / g and 5.82cm3 / g, with an adjustment range of 38%.

[0039] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0040] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A processing method for easily adjusting the filling value of stem fibers, comprising a stem fiber expansion step, wherein the stem fiber expansion step uses an expansion process gas to heat and humidify the stem fibers, the expansion process gas comprising steam and compressed air, and the volume ratio of steam to compressed air is a steam-to-air ratio, characterized in that: In the cut stem expansion process, an initial reference processing parameter group is selected in advance, including the moisture content C0 of the incoming cut stem, and the pressure A0 of the expansion process gas and the steam pressure ratio B0, the corresponding cut stem filling value of the initial reference processing parameter group is Y0, and the cut stem filling value is regulated by the following regulation modes: S1, when the required cut filler value Y 目 When Y0 is greater than Y, one or more of the following three measures is adopted: The steam pressure ratio is increased based on B0; the expansion process gas pressure is increased based on A0; the moisture content of the imported material is increased based on C0; S2, when the required cut filler value Y 目 When Y0, one or more of the following three measures is adopted: The steam pressure ratio is decreased based on B0; the expansion process gas pressure is decreased based on A0; the moisture content of the imported material is decreased based on C0; In the regulation modes S1 and S2, the pressure A of the expansion process gas is adjusted between 1.5-3.0 Pa, the steam pressure ratio B is adjusted between 0.25-4, and the moisture content C of the cut stem is adjusted between 29.0%-34.0%; In the control mode S1 and S2, when the required cut filler filling value Y 目 is greater than or equal to 0.3 cm 3 / g, all are adjusted in the following way: first only using the measure of adjusting the steam pressure duty ratio B, if only through the adjustment of the steam pressure duty ratio cannot get Y 目 , then simultaneously using the measures of adjusting the steam pressure duty ratio B and the pressure A of the expanded process gas, if through the adjustment of the steam pressure duty ratio B and the pressure A of the expanded process gas still cannot get Y 目 , then simultaneously using the measures of adjusting the steam pressure duty ratio B, the pressure A of the expanded process gas and the moisture content C of the incoming material. In the control modes S1 and S2, when the required cut filler value Y 目 is less than 0.3 cm 3 / g than the value Y0, the following adjustment is made: first, only one of the measures of adjusting the pressure A of the expanding process gas or adjusting the steam pressure ratio B is used, and if one measure alone cannot obtain Y 目 , both measures of adjusting the pressure A of the expanding process gas and adjusting the steam pressure ratio B are used.

2. The processing method of claim 1, wherein: In the initial reference processing parameter, the pressure A0 of the expansion process gas is 1.9-2.3 Bar, the steam pressure ratio B0 is 1.5-2.5, and the moisture content C0 of the cut stem is 31.5%-32.5%.

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