Online tobacco stem pretreatment system combining steam explosion with cut stem fermentation

Abstract

The invention discloses an online tobacco stem pretreatment system combining steam explosion with cut stem fermentation, and belongs to the technical field of tobacco leaf processing. The system sequentially comprises a high-pressure stem moistening unit, a stem pressing and cutting unit, an alcoholization fermentation unit and a drying winnowing unit; the high-pressure stem moistening unit comprises a high-pressure stem moistening machine; the stem pressing and cutting unit comprises a stem pressing machine and a stem cutting machine; the alcoholization fermentation unit comprises a feeding machine, a cut stem charging machine and a cut stem alcoholization device; the drying winnowing unit comprises a cut stem dampening machine and a thin plate type cut stem drying machine; a vibration groove is formed between the high-pressure stem moistening machine and the stem pressing machine; a vibration groove and a belt are arranged between the stem pressing machine and the stem cutting machine so that tobacco stems can be conveyed conveniently. By arranging the high-pressure stem moistening unit, the stem pressing and cutting unit, the alcoholization and fermentation unit and the drying and winnowing unit, the technological requirements of tobacco stem pretreatment can be met, the pretreatment efficiency is improved, the quality of the pretreated tobacco stems is guaranteed, and the labor intensity of workers and the production cost are reduced.

Description

Technical Field

[0001] The present application relates to an online tobacco stem pretreatment system combining steam explosion with cut stem fermentation, belonging to the technical field of tobacco leaf processing. Background Art

[0002] Tobacco stems account for 25% to 30% of the weight of tobacco leaves. Since tobacco stems have similar components to tobacco leaves and have the functions of improving the structure of cigarettes, reducing costs, and reducing harm and tar, they are an important component of cigarette raw materials. However, the content of cell wall substances in tobacco stems is higher in tobacco stems, accounting for more than 40%. Cell wall substances include cellulose, hemicellulose, pectin, lignin and other substances. After pyrolysis and combustion, pectin will produce pyrolysis products such as methanol, formaldehyde and formic acid. These products not only bring irritation to the smoke and cover up the aroma of cigarettes themselves, but also have certain harm to the human body; lignin is the main cause of the heavy woody smell in the smoke, resulting in strong coughing and burning throat during combustion, interfering with the aroma of the smoke, and pyrolysis of lignin will produce catechol and alkylcatechol, causing astringency and carcinogenic activity, affecting the quality and safety of cigarettes. The presence of tobacco stem cell wall substances will cause irritating coughs and strong woody miscellaneous gases when burning, which will have an adverse effect on the quality of tobacco smoking.

[0003] Therefore, during the pretreatment of tobacco stems, the content of cell wall substances in the tobacco stems needs to be reduced to meet people's requirements for tobacco smoking quality. Figure 1 A flow chart of the tobacco stem pretreatment process is shown. The tobacco stem pretreatment process includes the following steps: feeding - screening and moisture regain - high-pressure stem moistening - aging and fermentation - drying and air separation. In order to meet the above-mentioned process requirements for tobacco stem pretreatment, it is necessary to provide a corresponding tobacco stem online pretreatment system to improve the pretreatment efficiency, ensure the quality of the pretreated tobacco stems, and reduce the labor intensity of workers and production costs. Summary of the invention

[0004] In order to solve the above problems, the present application proposes an online tobacco stem pretreatment system that combines steam explosion with stem fermentation. By setting up a high-pressure stem moistening unit, a stem pressing and cutting unit, an aging and fermentation unit, and a drying and air selection unit, it can meet the process requirements of tobacco stem pretreatment, improve the pretreatment efficiency, ensure the quality of the tobacco stems after pretreatment, and reduce the labor intensity and production costs of workers.

[0005] According to one aspect of the present application, there is provided an online tobacco stem pretreatment system combining steam explosion with stem fermentation, which comprises a high-pressure stem moistening unit, a stem pressing and cutting unit, an alcoholization and fermentation unit and a drying and air selection unit in sequence; the high-pressure stem moistening unit comprises a high-pressure stem moistening machine; the stem pressing and cutting unit comprises a stem pressing machine and a stem cutting machine; the alcoholization and fermentation unit comprises a feeder, a stem cutting feeder and a stem cutting alcoholization device; the drying and air selection unit comprises a stem cutting moisture recovery machine and a thin-plate type stem cutting drying machine; a vibration trough is provided between the high-pressure stem moistening machine and the stem pressing machine; a vibration trough and a belt are provided between the stem pressing machine and the stem cutting machine to transport the tobacco stems; the feeder and the stem cutting machine are connected by a belt; the stem cutting moisture recovery machine is connected to the thin-plate type stem cutting drying machine.

[0006] Optionally, the feeder, the shredded stem feeder and the shredded stem alcoholization device are connected via a belt and a belt scale.

[0007] Optionally, the stem cutter includes a first stem cutter and a second stem cutter, the first stem cutter and the second stem cutter are connected via a vibration groove; the first stem cutter and the second stem cutter are arranged in parallel.

[0008] Optionally, the online pretreatment system further comprises a tobacco stem pretreatment unit; the tobacco stem pretreatment unit comprises a screening machine and a tobacco stem conditioning machine; the screening machine and the tobacco stem conditioning machine are connected in series.

[0009] Optionally, with the high-pressure stem moistening machine as the starting direction and the thin-plate stem shredded machine as the terminal direction, the equipment startup sequence is from the terminal to the starting direction. If the terminal equipment is not started, the starting equipment cannot be started; the shutdown sequence is the opposite, from the starting direction to the ending direction. If the starting equipment is not shut down, the terminal equipment cannot be shut down.

[0010] Optionally, the cut stem alcoholization device comprises a feed belt, a material distribution crane, a cut stem alcoholization cabinet, a discharge belt and a feeding belt which are connected in sequence to complete the steps of feeding, alcoholization fermentation and discharging.

[0011] Optionally, the feeding belt is connected to the shredded stem moisture conditioning machine.

[0012] Optionally, the stem aging cabinet is a side chain double-layer series storage structure, the bottom belt is made of stainless steel perforated chain plate, and the mesh The maximum belt speed is 0.01m / s, and the belt speed is controlled by frequency conversion.

[0013] Optionally, the high-pressure stem moistening machine is provided with a high-temperature and high-pressure air lock and a double-layer pressurized cavity, and the high-temperature and high-pressure air lock is provided with a silencer cavity.

[0014] According to another aspect of the present application, there is provided the application of the above-mentioned online tobacco stem pretreatment system combining steam explosion with cut stem fermentation in tobacco stem pretreatment.

[0015] The beneficial effects of this application include but are not limited to:

[0016] 1. The online tobacco stem pretreatment system combining steam explosion and stem fermentation provided in the present application can meet the process requirements of tobacco stem pretreatment by setting a high-pressure stem moistening unit, a stem pressing and cutting unit, an aging and fermentation unit, and a drying and air selection unit, thereby improving the pretreatment efficiency, ensuring the quality of the tobacco stems after pretreatment, and reducing the labor intensity and production costs of workers.

[0017] 2. The online tobacco stem pretreatment system combining steam explosion and stem fermentation provided in the present application realizes constant flow transportation of tobacco stems by setting up belts and belt scales, effectively reducing the labor intensity of workers and improving pretreatment efficiency.

[0018] 3. The online pretreatment system for tobacco stems by steam explosion combined with stem fermentation provided in the present application comprises a stem press and a first stem cutter and a second stem cutter arranged in parallel, which press and cut the tobacco stems that have been moistened with high pressure to facilitate subsequent alcohol fermentation, thereby improving the efficiency and effect of alcohol fermentation.

[0019] 4. The online tobacco stem pretreatment system combining steam explosion and stem fermentation provided in the present application has a tobacco stem pretreatment unit. By setting a screening machine and a tobacco stem moisturizing machine, on the one hand, before the formal pretreatment, the screening machine can remove possible impurities in the tobacco stems and screen out tobacco stems of a set length from the tobacco stems; on the other hand, the tobacco stem moisturizing machine can make the tobacco stems reach a specific preset moisture content, so as to carry out the subsequent high-pressure stem moisturizing process and ensure the effect of the subsequent steam explosion.

[0020] 5. The online pretreatment system for tobacco stems by steam explosion combined with fermentation of cut stems provided in the present application further defines the cut stem alcoholization device and the high-pressure stem moistening machine to meet the process requirements for online pretreatment of tobacco stems by steam explosion combined with fermentation of cut stems. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 This is a schematic diagram of the process flow of online pretreatment of tobacco stems by steam explosion combined with fermentation of cut stems involved in an embodiment of the present application;

[0023] Figure 2 It is a top plan view schematic diagram of a tobacco stem online pretreatment system for steam explosion combined with cut stem fermentation according to an embodiment of the present application;

[0024] Figure 3It is a vertical view of the stem silk alcoholization device involved in the embodiment of the present application.

[0025] List of parts and reference numerals:

[0026] 1. High-pressure stem moistening machine; 2. Stem press; 3. First stem cutter; 4. Second stem cutter; 5. Feeder; 6. Stem shred feeder; 7. Stem shred aging cabinet; 8. Stem shred rehumidification machine; 9. Thin plate type stem shred drying machine; 10. Vibrating trough; 11. Belt; 12. Belt scale; 13. Feeding belt; 14. Material dividing crane; 15. Discharging belt; 16. Feeding belt. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0028] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0030] In addition, in the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0034] refer to Figure 1-Figure 3 The embodiment of the present application discloses an online pretreatment system for tobacco stems by steam explosion combined with stem fermentation, which comprises a high-pressure stem moistening unit, a stem pressing and cutting unit, an alcoholization and fermentation unit and a drying and air selection unit in sequence; the high-pressure stem moistening unit comprises a high-pressure stem moistening machine 1; the stem pressing and cutting unit comprises a stem pressing machine 2 and a stem cutter; the alcoholization and fermentation unit comprises a feeder 5, a stem cut feeder 6 and a stem cut alcoholization device; the drying and air selection unit comprises a stem cut moisture recovery machine 8 and a thin-plate type stem cut drying machine 9; a vibration trough 10 is provided between the high-pressure stem moistening machine 1 and the stem pressing machine 2; a vibration trough 10 and a belt 11 are provided between the stem pressing machine 2 and the stem cutter to transmit the tobacco stems; the feeder 5 and the stem cutter are connected by a belt 11; the stem cut moisture recovery machine 8 is connected to the thin-plate type stem cut drying machine 9.

[0035] Specifically, the present application can meet the process requirements of tobacco stem pretreatment by setting up a high-pressure stem moistening unit, a stem pressing and cutting unit, an aging and fermentation unit, and a drying and air selection unit, thereby improving the pretreatment efficiency, ensuring the quality of the tobacco stems after pretreatment, reducing the labor intensity and production costs of workers, and realizing large-scale processing and production.

[0036] As an implementation mode, the feeder 5 , the shredded stem feeder 6 and the shredded stem alcoholization device are connected via a belt 11 and a belt scale 12 .

[0037] Specifically, by providing the belt 11 and the belt scale 12, a constant flow of tobacco stems can be conveyed, thereby effectively reducing the labor intensity of workers and improving the pretreatment efficiency.

[0038] As an embodiment, the stem cutter includes a first stem cutter 3 and a second stem cutter 4, and the first stem cutter 3 and the second stem cutter 4 are connected via a vibration groove 10; the first stem cutter 3 and the second stem cutter 4 are arranged in parallel.

[0039] Specifically, the stem press 2 and the first stem cutter 3 and the second stem cutter 4 arranged in parallel press and cut the tobacco stems that have been moistened under high pressure so as to facilitate subsequent alcohol fermentation and improve the efficiency and effect of alcohol fermentation. The first stem cutter 3 and the second stem cutter 4 are connected via a vibration trough 10, which can improve the efficiency of stem cutting on the one hand and effectively reduce the work intensity of workers on the other hand, thus being suitable for large-scale production operations.

[0040] As an embodiment, the online pretreatment system further includes a tobacco stem pretreatment unit; the tobacco stem pretreatment unit includes a screening machine and a tobacco stem conditioning machine; the screening machine and the tobacco stem conditioning machine are connected in series.

[0041] Specifically, by setting up a tobacco stem pre-treatment unit, a screening machine and a tobacco stem moisturizing machine, on the one hand, before formal pretreatment, the screening machine can remove possible impurities in the tobacco stems and screen out tobacco stems of a set length; on the other hand, the tobacco stem moisturizing machine can make the tobacco stems reach a specific preset moisture content, so as to carry out the subsequent high-pressure stem moisturizing process and ensure the effect of the subsequent steam explosion.

[0042] As an implementation method, the high-pressure stem moistening machine 1 is taken as the starting direction, and the thin-plate stem shred drying machine 9 is taken as the terminal direction. The equipment startup sequence is from the end to the beginning. If the end equipment is not started, the start equipment cannot be started. The shutdown sequence is the opposite, from the beginning to the end. If the start equipment is not shut down, the end equipment cannot be shut down.

[0043] As an embodiment, the cut stem alcoholization device includes a feed belt 13, a material distribution crane 14, a cut stem alcoholization cabinet 7, a discharge belt 15 and a feeding belt 16 connected in sequence to complete the steps of feeding, alcoholization fermentation and discharging.

[0044] Specifically, the infeed belt 13, the outfeed belt 15 and the feed belt 16 are sequentially arranged along the transport direction.

[0045] Specifically, the stem aging cabinet 7 adopts warm and humid hot air circulation, the hot air temperature is (40-50)°C, the tolerance is: ±2°C; the relative humidity is: (60-80)%, the tolerance is: ±3%; it is adjustable and controllable; each layer in the cabinet is equipped with at least 4 temperature and humidity online detections.

[0046] Specifically, the maximum hot air volume of a single stem silk alcoholization cabinet 7 is 10,000 m3 / h, the hot air fan adopts frequency conversion control, and the air volume is adjustable; the moisture exhaust air volume: the maximum moisture exhaust air volume is designed as 15% of the total air volume, and the moisture exhaust air volume is controlled by an automatic damper.

[0047] As an implementation mode, the feeding belt 16 is connected to the shredded stem moisture conditioning machine 8 .

[0048] Specifically, the tobacco stems that have undergone aging and fermentation are heated and humidified by the cut stem moisture conditioning machine 8 .

[0049] Specifically, the pressure of the cut stem conditioning machine 8 is set to 1.7 bar, the spiral frequency is set to 22 Hz, and the steam temperature is set to 145.00°C.

[0050] As an implementation method, the stem aging cabinet 7 is a side chain double-layer series storage structure, the bottom belt is made of stainless steel perforated chain plate, and the mesh The maximum belt speed is 0.01m / s, and the belt speed is controlled by frequency conversion.

[0051] As an implementation mode, the high-pressure stem moistening machine 1 is provided with a high-temperature and high-pressure air lock and a double-layer pressurized cavity, and the high-temperature and high-pressure air lock is provided with a silencer cavity.

[0052] Specifically, the use of a double-layer pressurized cavity can achieve the separation of tobacco stems and tobacco, and realize steam steaming of the stems; by setting up a silencer cavity, the noise is made ≤70dB.

[0053] Two groups of samples of expanded tobacco stems treated by the online tobacco stem pretreatment system for steam explosion combined with cut stem fermentation provided by the present invention were tested, and the results are shown in the following table.

[0054] 1. Physical index detection of shredded stems

[0055] Table 1 Physical index data of shredded stems

[0056]

[0057]

[0058] The whole-stem rate of traditional shredded stems is 81.2%, while the whole-stem rate of the fermented shredded stems in this application is 80.9%, which is slightly lower, and the filling value is 6.92cm 3 / g, maintaining a good level and able to meet the quality requirements of large-scale production process.

[0059] 2. Online consumption detection of shredded stems

[0060] Table 2 Online consumption of shredded stems

[0061] project Total amount (kg) Material cumulative amount 3631 Offline processing and screening of tobacco dust 67.6 Addition residue 13.3 Residue of container 2.5 Coming out residual 20 Total Consumable Materials 103.4 Loss rate 2.8％

[0062] It can be seen from Table 2 that the consumption loss rate of the shredded stems after fermentation in the present application is 2.8%, and the shredded stems have good processing resistance.

[0063] 3. Sensory quality evaluation of shredded stems

[0064] (1) Evaluation method

[0065] The sample of Example 1 was rolled into cigarettes and placed in a constant temperature and humidity chamber for 48 hours at a temperature of (22±1)°C and a relative humidity of (60±2)%. Seven members of the tobacco evaluation committee were organized to conduct sensory quality evaluation.

[0066] (2) Evaluation results: After high-pressure pretreatment of tobacco stems with moistening and bio-fermentation, the woody smell and irritation of the tobacco stems were slightly reduced compared with those before treatment. The treated shredded stems were closer to the shape of tobacco leaves and had a good appearance. The cigarettes modified by adding shredded stems were non-irritating, free of impurities, and had smooth smoke. The average sensory quality score was 48.1 points, and the sensory evaluation quality was stable.

[0067] 4. Evaluation of the effects of steam explosion on chemical composition

[0068] The changes in the content of cell wall substances and chemical components in the tobacco stems before and after treatment were measured, and the test results are shown in Tables 3 and 4.

[0069] Table 3 Results of changes in cell wall material content

[0070] Sample Information Full Fiber Pectin Lignin Cell wall material As is 28.7 5.8 3.96 38.46 After treatment 26.5 5.3 2.87 34.67

[0071] Table 4 Changes in chemical composition of tobacco stems

[0072] Sample Information As is After treatment Total sugar (%) 18.8 18.6 Total plant alkaloids (%) 0.34 0.50 chlorine(%) 3.80 1.90 Reducing sugar (%) 13.0 11.7 Potassium (%) 4.83 5.83 Total nitrogen (%) 1.49 1.31 protein 8.92 8.54 PH 4.95 4.83 Chlorogenic acid 0.98 1.46 Scopolamine 0.25 0.30 Rutin 0.00 0.00 Total volatile alkali 0.13 0.08 starch 1.6 1.5

[0073] It can be seen from Tables 3 and 4 that after treatment, the total cellulose content decreased by 7.67%, pectin decreased by 8.62%, lignin decreased by 27.53%, the cell wall material content of tobacco stems decreased by 9.85%, the total sugar content decreased by 1.06% after treatment, the reducing sugar content decreased by 10%, the total nitrogen content decreased by 12.1%, and the total volatile alkali content decreased by 38.46%.

[0074] 5. Evaluation of the changes in aroma components by steam explosion

[0075] The aroma components of the tobacco stems before and after treatment were investigated, and the test results are shown in Table 5.

[0076] Table 5: Changes in aroma components

[0077]

[0078]

[0079]

[0080]

[0081]

[0082]

[0083] It can be seen from Table 5 that 73 aroma components were detected before treatment, while 88 aroma components were detected after treatment. After treatment, the components of tobacco stems tended to be hydrolyzed into more small molecule aroma components, including 53 new aroma components such as 2,3-pentanedione, 3-furfural, methylcyclopentenolone, 3-phenylpyridine, 4,7,9-megatriene-3-one, 5-methyl-2-phenylindoleazine, 3-furfural, 2'-hydroxy-5'-methylacetophenone, etc. The total amount of aroma components increased from 93.2899μg / g to 107.6061μg / g. Some flavor components such as isovaleraldehyde, 2-methyltetrahydrofuran-3-one, furfuryl alcohol, cyclopent-4-ene-1,3-dione, 2-acetylfuran, 5-methylfurfural, phenylacetaldehyde, 2-acetylpyrrole, etc. increased significantly. These substances will have a positive effect on the formation of the aroma of the tobacco stems, thereby further increasing the aroma and taste of the stems.

[0084] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0085] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A tobacco stem online pretreatment system combining steam explosion with stem fermentation, characterized in that: It includes a high-pressure stem moistening unit, a stem pressing and cutting unit, an alcoholization and fermentation unit and a drying and air selection unit in sequence; the high-pressure stem moistening unit includes a high-pressure stem moistening machine; the stem pressing and cutting unit includes a stem pressing machine and a stem cutting machine; the alcoholization and fermentation unit includes a feeder, a stem shred feeder and a stem shred alcoholization device; the drying and air selection unit includes a stem shred moisture recovery machine and a thin-plate type stem shred drying machine; a vibration trough is provided between the high-pressure stem moistening machine and the stem pressing machine; a vibration trough and a belt are provided between the stem pressing machine and the stem cutting machine to transport the tobacco stems; the feeder is connected to the stem cutting machine by a belt; the stem shred moisture recovery machine is connected to the thin-plate type stem shred drying machine.

2. The online tobacco stem pretreatment system combining steam explosion and cut stem fermentation according to claim 1, characterized in that: The feeder, the shredded stem feeder and the shredded stem alcoholization device are connected through a belt and a belt scale.

3. The online tobacco stem pretreatment system combining steam explosion and cut stem fermentation according to claim 1, characterized in that: The stem cutter comprises a first stem cutter and a second stem cutter, wherein the first stem cutter and the second stem cutter are connected via a vibration groove; and the first stem cutter and the second stem cutter are arranged in parallel.

4. The online tobacco stem pretreatment system combining steam explosion and cut stem fermentation according to claim 1, characterized in that: The online pretreatment system also includes a tobacco stem pretreatment unit; the tobacco stem pretreatment unit includes a screening machine and a tobacco stem conditioning machine; the screening machine and the tobacco stem conditioning machine are connected in series.

5. The online tobacco stem pretreatment system combining steam explosion and cut stem fermentation according to claim 1, characterized in that: With the high-pressure stem moistening machine as the starting direction and the thin-plate stem shred drying machine as the terminal direction, the equipment startup sequence is from the end to the beginning. If the end equipment is not started, the beginning equipment cannot be started; the shutdown sequence is the opposite, from the beginning to the end. If the beginning equipment is not shut down, the end equipment cannot be shut down.

6. The online tobacco stem pretreatment system combining steam explosion and cut stem fermentation according to claim 1, characterized in that: The cut stem alcoholization device comprises a feed belt, a material distribution crane, a cut stem alcoholization cabinet, a discharge belt and a feeding belt which are connected in sequence to complete the steps of feeding, alcoholization fermentation and discharging.

7. The online tobacco stem pretreatment system combining steam explosion and cut stem fermentation according to claim 6, characterized in that: The feeding belt is connected to the shredded stem moisture conditioning machine.

8. The online tobacco stem pretreatment system combining steam explosion and cut stem fermentation according to claim 6, characterized in that: The cut stems alcoholization cabinet is a side chain type double-layer serial storage structure, the bottom belt adopts a stainless steel perforated chain plate, the mesh is φ1.0, the maximum belt speed is 0.01m / s, and the belt speed is controlled by frequency conversion.

9. The online tobacco stem pretreatment system combining steam explosion and cut stem fermentation according to claim 1, characterized in that: The high-pressure stem moistening machine is provided with a high-temperature and high-pressure air lock and a double-layer pressurized cavity, and the high-temperature and high-pressure air lock is provided with a silencer cavity.

10. Use of the online tobacco stem pretreatment system combining steam explosion and cut stem fermentation according to any one of claims 1 to 9 in tobacco stem pretreatment.

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