A method for stabilizing the quality of a papermaking process reconstituted tobacco extract

Abstract

The present application belongs to the technical field of reconstituted tobacco production and processing, and particularly relates to a method for stabilizing the quality of a papermaking reconstituted tobacco extraction liquid. The method comprises the steps of washing stems, squeezing, temporary storage, and extraction. The present application also provides a system for realizing the stable quality of the papermaking reconstituted tobacco extraction liquid, which comprises a stem washing machine, a screw pump, a stem squeezing machine, a rotary stem bin, and a first-stage extraction device. The present application optimizes the operation mode of the stem washing machine and adds a rotary stem bin, thereby improving the control accuracy of the stem washing and mixed extraction process conditions, allowing the washed stems to be temporarily stored in the stem bin for a short time and then rapidly enter the mixed extraction equipment, ensuring the stable quality of the washed stems and the uniform and sufficient extraction of the effective substances in the tobacco, meeting the quality requirements of the extraction liquid, ensuring the stability of the quality, improving the operation efficiency of the mixed extraction equipment, and reducing the production energy consumption.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of reconstituted tobacco production, and particularly relates to a method for stabilizing the quality of a papermaking reconstituted tobacco extraction solution. BACKGROUND

[0002] The papermaking reconstituted tobacco extraction process is mainly a process of extracting water-soluble substances in tobacco raw materials by water. Since the raw material composition of the papermaking reconstituted tobacco is complex, although the raw material is homogenized and mixed in the feeding section, the quality of the raw material entering the extraction section still fluctuates. Therefore, the extraction section is a key section in the production process of the papermaking reconstituted tobacco, and the stability of the extraction solution quality directly affects the quality of the concentrated solution, and further affects the stability of the coating rate and intrinsic quality of the papermaking reconstituted tobacco.

[0003] The total sugar and reducing sugar content of the tobacco stem is higher than that of the broken pieces and tobacco dust, and the content of chlorine and potassium is significantly higher. However, the components such as sugar, chlorine and potassium are easily soluble in water. Therefore, the tobacco stem usually needs to be washed before entering the extraction section to control the quality of the tobacco stem entering the extraction section, especially the stability of the chemical indicators, which is a key step to control the quality stability of the papermaking reconstituted tobacco extraction solution.

[0004] The commonly used washing equipment for tobacco stems in the industry mainly includes vertical and horizontal washing tanks. The control precision is low, and the adjustability of the washing time is small. At the same time, due to the specific gravity characteristics of the tobacco stem and water, if the mixture is not properly controlled during the washing process, the tobacco stem is likely to float in the tank, which cannot guarantee that the washed tobacco stem is discharged in the order of first in and first out, and the quality stability of the washed tobacco stem cannot be guaranteed.

[0005] The washed tobacco stem is pumped to a tobacco stem dewatering machine, and then enters the mixed extraction section after solid-liquid separation. The mixed extraction is usually carried out in batches in a batch mode. In order to ensure the extraction rate of tobacco effective substances, the extraction time needs to be strictly controlled. Usually, the time is counted when the washed tobacco stem enters the mixed extraction equipment, and the extraction is ended as a extraction cycle. On the one hand, if the batch feeding amount of the tobacco stem formula is large, the washed tobacco stem in the same batch needs a long time to enter the mixed extraction, which leads to a large difference in the extraction time of the first and last washed tobacco stem entering the mixed extraction, and the quality stability of the extraction solution is difficult to guarantee. On the other hand, the mixed extraction equipment starts to run as soon as the washed tobacco stem enters, and the running time is greatly increased until the batch extraction is completed, which further increases the production energy consumption.

[0006] Therefore, it is necessary to optimize the washing process, equipment and the way of the washed tobacco stem entering the extraction section in the production process of the reconstituted tobacco, to improve the quality stability of the washed tobacco stem, and to ensure the quality stability of the extraction solution. SUMMARY

[0007] In order to solve the problems in the prior art, the application provides a method for stabilizing the quality of a papermaking process reconstituted tobacco leaching liquid, which adds a rotary tobacco stem bin, so that the washed tobacco stems can be quickly introduced into a mixing leaching device after being temporarily stored in the tobacco stem bin for a short time, thereby ensuring the stable quality of the washed tobacco stems and realizing uniform and sufficient leaching of effective substances in the tobacco, meeting the quality requirements of the leaching liquid, ensuring the quality stability, and improving the production efficiency and the effective operation rate of the equipment.

[0008] In order to solve the problems in the prior art, the application provides a method for stabilizing the quality of a papermaking process reconstituted tobacco leaching liquid, which adds a rotary tobacco stem bin, so that the washed tobacco stems can be quickly introduced into a mixing leaching device after being temporarily stored in the tobacco stem bin for a short time, thereby ensuring the stable quality of the washed tobacco stems and realizing uniform and sufficient leaching of effective substances in the tobacco, meeting the quality requirements of the leaching liquid, ensuring the quality stability, and improving the production efficiency and the effective operation rate of the equipment.

[0009] A method for stabilizing the quality of a papermaking process reconstituted tobacco leaching liquid, which optimizes the connection mode and operation mode of a stem washing device and a washed tobacco stem storage device to improve the control accuracy of the stem washing and the first-stage leaching process conditions.

[0010] Specifically, the method comprises the steps of washing the stems, squeezing, temporary storage, and leaching.

[0011] Further, based on a general inventive concept, the application also provides a system for stabilizing the quality of a papermaking process reconstituted tobacco leaching liquid, which comprises a stem washing machine, a screw pump, a tobacco stem squeezing machine, a rotary tobacco stem bin, and a first-stage leaching device.

[0012] The stem washing machine comprises a rotating drum and a first conveying screw arranged in the rotating drum; the rotating drum is horizontally arranged, the left and right ends of the rotating drum are closed, the upper side wall of the rotating drum is provided with a first feeding port, and the lower side wall of the rotating drum is provided with a first discharging port; the rotating drum can rotate around the axial center line thereof, and the first conveying screw can rotate relative to the rotating drum in the rotating drum;

[0013] The screw pump is horizontally arranged, the upper side wall of the screw pump is provided with a second feeding port, the left end of the screw pump is closed, and the right end of the screw pump is provided with a second discharging port; a second conveying screw is arranged in the screw pump along the extension direction of the screw pump, and the second conveying screw can rotate relative to the screw pump in the screw pump; the first discharging port is connected with the second feeding port through a pipeline;

[0014] The tobacco stem squeezing machine is horizontally arranged, the left and right ends of the tobacco stem squeezing machine are closed, the upper side wall of the tobacco stem squeezing machine is provided with a third feeding port, and the lower side wall of the tobacco stem squeezing machine is provided with a third discharging port; a third conveying screw is arranged in the tobacco stem squeezing machine along the extension direction of the tobacco stem squeezing machine, and the third conveying screw can rotate relative to the tobacco stem squeezing machine in the tobacco stem squeezing machine; the second discharging port is connected with the third feeding port through a pipeline;

[0015] The rotating tobacco stem bin is horizontally arranged, the left and right ends of the tobacco stem bin are closed, the upper side wall of the tobacco stem bin is provided with a fourth feeding / discharging passage, the extension direction of the fourth feeding / discharging passage is perpendicular to the extension direction of the tobacco stem bin; a valve is arranged at the inlet of the fourth feeding / discharging passage, the valve can control the opening and closing of the fourth feeding / discharging passage; a fourth conveying screw is arranged in the tobacco stem bin along the extension direction of the tobacco stem bin, and the fourth conveying screw can rotate relative to the tobacco stem bin in the tobacco stem bin.

[0016] The top end of the first-stage leaching device is provided with a fifth feeding port, a tobacco dust feeding port and a liquid inlet; the lower side wall of the first-stage leaching device is provided with a fifth discharging port.

[0017] Specifically, the first feeding port is close to the left end of the rotating drum, and the first discharging port is close to the right end of the rotating drum.

[0018] Specifically, the first conveying screw extends along the extension direction of the rotating drum, and the shaft end of the first conveying screw extends out of the rotating drum to the right, and the shaft end of the first conveying screw is connected with a first working motor; the axial center line of the first conveying screw coincides with the axial center line of the rotating drum; the first conveying screw is driven to rotate by the first working motor, so as to push the material entering the rotating drum from the first feeding port to move to the right and be discharged from the first discharging port.

[0019] Specifically, the second feeding port is close to the left end of the screw pump.

[0020] Specifically, the shaft end of the second conveying screw extends out of the screw pump to the left, and the shaft end of the second conveying screw is connected with a second working motor; the axial center line of the second conveying screw coincides with the axial center line of the screw pump; the second conveying screw is driven to rotate by the second working motor, so as to push the material entering the screw pump from the second feeding port to move to the right and be discharged from the second discharging port.

[0021] Specifically, the third feeding port is close to the left end of the tobacco stem extruding dryer, and the third discharging port is close to the right end of the tobacco stem extruding dryer.

[0022] Specifically, the shaft end of the third conveying screw extends out of the tobacco stem extruding dryer to the right, and the shaft end of the third conveying screw is connected with a third working motor; the axial center line of the third conveying screw coincides with the axial center line of the tobacco stem extruding dryer; the third conveying screw is driven to rotate by the third working motor, so as to push the material entering the tobacco stem extruding dryer from the third feeding port to move to the right and be discharged from the third discharging port.

[0023] Specifically, the fourth feeding / discharging passage is a passage combining the feeding passage and the discharging passage; a valve is arranged at the inlet of the fourth feeding / discharging passage; the valve is a pneumatic gate valve, which can be realized by using conventional equipment in the prior art, and the structure is not the point of the present application, so it will not be described again.

[0024] Specifically, the tobacco stem bin can be intermittently rotated with its axial center line as the center, and the intermittent rotation of the tobacco stem bin can make the material entering the tobacco stem bin fully mixed and temporarily stored.

[0025] Specifically, the axial end of the fourth conveying screw extends out of the tobacco stem bin to the right, and the axial end of the fourth conveying screw is connected with a fourth working motor; the fourth conveying screw is located in the tobacco stem bin and close to one side of the fourth feeding / discharging passage, and the axial center line of the fourth conveying screw deviates from the axial center line of the tobacco stem bin; the fourth working motor drives the fourth conveying screw to rotate, and the washed tobacco stems are discharged through the fourth feeding / discharging passage and then enter the first-stage immersion device.

[0026] Further, in the actual production process, in order to realize the mixing and storage functions of the tobacco stem bin, the tobacco stem bin is arranged above the first-stage immersion device, the tobacco stem squeezing machine is arranged above the tobacco stem bin, and the fourth feeding / discharging passage is located directly below the third discharging port, and the fifth feeding port is located directly below the fourth feeding / discharging passage.

[0027] Further preferably, the screw pump and the first-stage immersion device are arranged on the horizontal ground, and the rotating drum is arranged at a position higher than the screw pump and at a position lower than the tobacco stem bin.

[0028] Further preferably, the third discharging port, the fourth feeding / discharging passage and the fifth feeding port are located on the same vertical line.

[0029] Further, the specific steps of the method for stabilizing the quality of the immersion liquid of the paper-making process reconstituted tobacco leaf are as follows:

[0030] 1) Washing stems: the formula tobacco stems for paper-making process reconstituted tobacco leaf production and a washing stem solvent are sent into the rotating drum of the stem washing machine to wash the stems;

[0031] 2) Squeezing and temporary storage: the washed tobacco stems and the washing stem solvent treated by the stem washing machine are conveyed to the tobacco stem squeezing machine by the screw pump to realize the separation of the washed tobacco stems and the washing stem solvent;

[0032] At this time, the tobacco stem bin is rotated, the opening of the fourth feeding / discharging passage is aligned with the third discharging port, the valve in the fourth feeding / discharging passage is opened, and then the washed tobacco stems enter the tobacco stem bin through the third discharging port and the fourth feeding / discharging passage;

[0033] After the feeding of the batch of washed tobacco stems is completed, the valve in the fourth feeding / discharging passage is closed, and the tobacco stem bin is periodically rotated to mix and temporarily store the washed tobacco stems in the tobacco stem bin;

[0034] 3) Leaching: when the first stage leaching device meets the feeding condition, the fourth inlet / outlet channel is rotated to align with the fifth inlet, the valve in the fourth inlet / outlet channel is opened, the washed tobacco stems are discharged through the fourth inlet / outlet channel and enter the first stage leaching device from the fifth inlet;

[0035] At the same time when the washed tobacco stems enter the first stage leaching device, the formula tobacco dust and the leaching solvent are fed into the first stage leaching device, after the feeding is completed, the valve of the fourth inlet / outlet channel is closed, and the leaching starts as the starting point of a leaching cycle, and after the leaching is completed, the material is discharged to the next process.

[0036] Preferably, in step 1), the solid-liquid ratio of the formula tobacco stems and the washed stem solvent is 1 kg:(10-14) m 3 , and the amount of formula tobacco stems added is (1200-1500) kg.

[0037] Preferably, in step 1), the washed stem solvent is clean water.

[0038] Preferably, in step 1), the temperature of the washed stem solvent is (30-50) °C.

[0039] Preferably, in step 1), when the tobacco stems are washed, the rotating drum rotates around its axial center line, and the first conveying screw rotates in the rotating drum relative to the rotating drum, both the first conveying screw and the rotating drum rotate in the counterclockwise direction; by adjusting the rotation frequency of the rotating drum (20-30) HZ and the rotation frequency of the first conveying screw (32-36) HZ, the washing time (3-5) min is controlled, the washed tobacco stems and the washing solvent are tumbled under the action of the rotating drum and the first conveying screw, which can avoid the floating of the tobacco stems and realize the uniform mixing of the tobacco stems and the washing solvent.

[0040] Preferably, in step 2), the operation frequency of the tobacco stem extrusion machine is (30-35) HZ, and the back pressure is (0-2.0) bar.

[0041] Preferably, in step 2), the dryness of the washed tobacco stems entering the tobacco stem bin is (25-30) %.

[0042] Preferably, in step 2), the rotating period of the tobacco stem bin is half a circle every (8-10) min.

[0043] Preferably, in step 3), when the first stage leaching device is fed, the rotation frequency of the fourth conveying screw is adjusted to (44-48) HZ to control the discharge speed of the washed tobacco stems.

[0044] Preferably, in step 3), the total feeding time of the washed tobacco stems and the formula tobacco dust is controlled to be within 8 min; and the feeding amount of the formula tobacco dust is (1500-1800) kg.

[0045] Preferably, in step 3), at the end of one leaching cycle, the fourth inlet / outlet channel is rotated to the upper side of the tobacco stem storage bin to start the feeding, temporary storage of the next batch of washed tobacco stems in the tobacco stem storage bin.

[0046] Preferably, in step 3), the leaching solvent is clean water.

[0047] Preferably, in step 3), the leaching solvent temperature is (50-65) °C, and the added amount is (10-12) m 3 .

[0048] Preferably, in step 3), the mixing leaching time in the first-stage leaching device is (50-60) min.

[0049] Compared with the prior art, the present application has the following beneficial effects:

[0050] The present application provides a method and a corresponding system for stabilizing the quality of papermaking process reconstituted tobacco leaching liquor. The method starts from the key production process that affects the stability of the quality of papermaking process reconstituted tobacco leaching liquor, optimizes the operation mode of the tobacco stem washing machine, adds a rotary tobacco stem storage bin, improves the control accuracy of the tobacco stem washing and mixing leaching process conditions, and enables the batch of washed tobacco stems to quickly enter the mixing leaching equipment after being temporarily stored in the tobacco stem storage bin for a short time, thereby ensuring the stability of the washed tobacco stem quality and realizing the uniform and sufficient leaching of the effective substances in the tobacco, fully playing the buffering function of the tobacco stem storage bin, meeting the quality requirements of the leaching liquor, ensuring the stability of the quality, improving the operation efficiency of the mixing leaching equipment, and reducing the production energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 is a structural schematic diagram of the system for stabilizing the quality of papermaking process reconstituted tobacco leaching liquor according to the present application. DETAILED DESCRIPTION

[0052] In order to facilitate the understanding of the present application, the present application will be described in more detail below in combination with the drawings and preferred embodiments, but the protection scope of the present application is not limited to the following specific embodiments.

[0053] Unless otherwise defined, all the professional terms used herein have the same meanings as generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing the specific embodiments and are not intended to limit the protection scope of the present application.

[0054] Unless otherwise specified, the various raw materials, reagents, instruments and equipment used in the present application can be purchased from the market or can be prepared by the existing methods.

[0055] Example 1

[0056] The application provides a method for stabilizing the quality of a paper-making process reconstituted tobacco extract, which starts from the key production process affecting the stability of the quality of the paper-making process reconstituted tobacco extract, and optimizes the connection mode and operation mode of the stalk washing equipment and the post-washing tobacco stalk storage equipment to improve the control precision of the stalk washing and the first-stage extraction process conditions.

[0057] Specifically, the method comprises the steps of stalk washing, squeezing, temporary storage, extraction and the like.

[0058] Further, the application provides a system for stabilizing the quality of a paper-making process reconstituted tobacco extract, which comprises a stalk washing machine, a screw pump 2, a tobacco stalk squeezing machine 3, a rotary tobacco stalk bin 4 and a first-stage extraction device 5 (i.e., a mixed extraction equipment).

[0059] The first-stage extraction device 5 in the application is a conventional device in the prior art, the stalk washing machine, the screw pump 2 and the tobacco stalk squeezing machine 3 can all adopt conventional models of the existing devices, and the structure is not the point of the application, so it will not be described here.

[0060] It should be noted that, in order to introduce the process method in Embodiment 2 in detail, the structures of some of the devices in the system in Embodiment 1 are introduced as follows:

[0061] The stalk washing machine comprises a rotary drum 1 and a first conveying screw 11 arranged in the rotary drum 1; the rotary drum 1 is horizontally arranged, the left and right ends of the rotary drum 1 are closed, the upper side wall of the rotary drum 1 is provided with a first feeding port 12, and the lower side wall of the rotary drum 1 is provided with a first discharging port 13; the first feeding port 12 is close to the left end of the rotary drum 1, and the first discharging port 13 is close to the right end of the rotary drum 1.

[0062] The first conveying screw 11 extends along the extension direction of the rotary drum 1, and the shaft end of the first conveying screw 11 extends out of the rotary drum 1 to the right, and the shaft end of the first conveying screw 11 is connected with a first working motor; the axial center line of the first conveying screw 11 coincides with the axial center line of the rotary drum 1; the rotary drum 1 can rotate around the axial center line thereof, and the first conveying screw 11 can rotate relative to the rotary drum 1 in the rotary drum 1; the first conveying screw 11 is driven to rotate by the first working motor, so as to push the material entering the rotary drum 1 from the first feeding port 12 to move to the right and discharge from the first discharging port 13.

[0063] The screw pump 2 is horizontally arranged, the upper side wall of the screw pump 2 is provided with a second feeding port 21, the left end of the screw pump 2 is closed, and the right end of the screw pump 2 is provided with a second discharging port; the second feeding port 21 is close to the left end of the screw pump 2.

[0064] A second conveying screw 22 is arranged in the screw pump 2 along the direction of extension of the screw pump 2, the axial end of the second conveying screw 22 extends out of the screw pump 2 to the left, and the axial end of the second conveying screw 22 is connected with a second working motor; the axial center line of the second conveying screw 22 coincides with the axial center line of the screw pump 2, and the second conveying screw 22 can rotate relative to the screw pump 2 in the screw pump 2; the second conveying screw 22 is driven to rotate by the second working motor, so as to push the material entering the screw pump 2 from the second feeding port 21 to move to the right and be discharged from the second discharging port;

[0065] The first discharging port 13 is connected with the second feeding port 21 through a pipeline.

[0066] The tobacco stem extruding dryer 3 is horizontally arranged, the left and right ends of the tobacco stem extruding dryer 3 are closed, the upper side wall of the tobacco stem extruding dryer 3 is provided with a third feeding port, and the lower side wall of the tobacco stem extruding dryer 3 is provided with a third discharging port; the third feeding port is close to the left end of the tobacco stem extruding dryer 3, and the third discharging port is close to the right end of the tobacco stem extruding dryer 3.

[0067] A third conveying screw 31 is arranged in the tobacco stem extruding dryer 3 along the direction of extension of the tobacco stem extruding dryer 3, the axial end of the third conveying screw 31 extends out of the tobacco stem extruding dryer 3 to the right, and the axial end of the third conveying screw 31 is connected with a third working motor; the axial center line of the third conveying screw 31 coincides with the axial center line of the tobacco stem extruding dryer 3, and the third conveying screw 31 can rotate relative to the tobacco stem extruding dryer 3 in the tobacco stem extruding dryer 3; the third conveying screw 31 is driven to rotate by the third working motor, so as to push the material entering the tobacco stem extruding dryer 3 from the third feeding port to move to the right and be discharged from the third discharging port.

[0068] The second discharging port is connected with the third feeding port through a pipeline.

[0069] The tobacco stem bin 4 is horizontally arranged, the left and right ends of the tobacco stem bin 4 are closed, the upper side wall of the tobacco stem bin 4 is provided with a fourth feeding / discharging passage 41, the fourth feeding / discharging passage 41 is a passage combining the feeding passage and the discharging passage, and the extension direction of the fourth feeding / discharging passage 41 is perpendicular to the extension direction of the tobacco stem bin 4; a pneumatic gate valve 43 is arranged at the inlet of the fourth feeding / discharging passage 41, and the pneumatic gate valve 43 can control the opening and closing of the fourth feeding / discharging passage 41; the pneumatic gate valve 43 can be realized by using conventional equipment in the prior art, and the structure thereof is not the point of the present application, so it will not be described herein.

[0070] The tobacco stem bin 4 can be intermittently rotated about the axial center line thereof, and the intermittent rotation of the tobacco stem bin 4 can make the material entering the tobacco stem bin 4 be fully mixed and temporarily stored.

[0071] Specifically, a fourth conveying screw 42 is provided in the tobacco stem silo 4 along the direction in which the tobacco stem silo 4 extends, the axial end of the fourth conveying screw 42 extends to the right out of the tobacco stem silo 4, and the axial end of the fourth conveying screw 42 is connected to a fourth working motor; the fourth conveying screw 42 is located on the side of the tobacco stem silo 4 close to the fourth inlet / outlet channel 41, and the axial center line of the fourth conveying screw 42 deviates from the axial center line of the tobacco stem silo 4, and the fourth conveying screw 42 can rotate relative to the tobacco stem silo 4 in the tobacco stem silo 4; the fourth conveying screw 42 is driven to rotate by the fourth working motor, and the washed tobacco stems are discharged through the fourth inlet / outlet channel 41 and then enter the first-stage extraction device 5.

[0072] Figure 1 In the figure, the solid line on the upper side of the tobacco stem silo 4 represents the fourth inlet / outlet channel 41 located on the upper side of the tobacco stem silo 4 in this state. At this time, the fourth conveying screw 42 is located above the axial center line of the tobacco stem silo 4. In addition, Figure 1 The dotted line at the lower side of the tobacco stem bin 4 represents the fourth inlet / outlet channel 41 located at the lower side of the tobacco stem bin 4 when the tobacco stem bin 4 rotates downward.

[0073] Figure 1 The axial center lines of the central rotary drum 1, the screw pump 2, the tobacco stem squeezer 3, the tobacco stem silo 4, the first conveying screw 11, the second conveying screw 22, the third conveying screw 31 and the fourth conveying screw 42 are all indicated by dotted lines.

[0074] The first-stage leaching device 5 is a tank-shaped structure. A fifth feed port 51 , a tobacco dust feed port 53 and a liquid inlet 54 are provided on the top of the first-stage leaching device 5 . A fifth discharge port 52 is provided on the lower side wall of the first-stage leaching device 5 .

[0075] Specifically, in the actual production process, in order to realize the mixing and storage functions of the tobacco stem silo 4, the tobacco stem silo 4 is arranged above the first-stage extraction device 5, the tobacco stem squeezer 3 is arranged above the tobacco stem silo 4, and the fourth inlet / outlet channel 41 is located directly below the third outlet port, and the fifth inlet 51 is located directly below the fourth inlet / outlet channel 41.

[0076] Preferably, the screw pump 2 and the first-stage extraction device 5 are arranged on the horizontal ground, the rotating drum 1 is arranged at a position higher than the screw pump 2 , and the rotating drum 1 is arranged at a position lower than the tobacco stem silo 4 .

[0077] Further preferably, in the present invention, the third discharge port, the fourth inlet / outlet channel 41, and the fifth feed port 51 are all located on the same vertical line, that is, the third discharge port and the fourth inlet / outlet channel 41 are aligned but not connected, and the fourth inlet / outlet channel 41 and the fifth feed port 51 are aligned but not connected.

[0078] Example 2

[0079] Example 2 provides a method for stabilizing the quality of a paper-process reconstituted tobacco leaf extract using the system of Example 1, the specific steps being as follows:

[0080] 1) Washing stems: (1200-1500) kg of formula tobacco stems for paper-process reconstituted tobacco leaf production and washing stem solvent are fed into the rotary drum 1 through the first feeding port 12 at a solid-liquid ratio of 1 kg:(10-14) m 3 of water at a temperature of (30-50) °C;

[0081] The washing stem machine is then started, and the rotary drum 1 is rotated about its axial centerline, while the first conveying screw 11 rotates relative to the rotary drum 1, both in counterclockwise directions. The rotation frequency of the rotary drum 1 is adjusted to (20-30) HZ, and the rotation frequency of the first conveying screw 11 is adjusted to (32-36) HZ, to control the washing stem duration to (3-5) min. The washed tobacco stems and washing stem solvent are tumbled under the action of the rotary drum 1 and the first conveying screw 11, which can avoid the tobacco stems floating and achieve uniform mixing of the tobacco stems and washing stem solvent. At the same time, the tobacco stems are moved to the right by the spiral on the first conveying screw 11 and discharged from the first discharge port 13;

[0082] 2) Squeezing and temporary storage: the washed tobacco stems and washing stem solvent after being processed by the washing stem machine are fed into the screw pump 2 through the second feeding port 21, and then conveyed to the tobacco stem squeezing machine 3 by the screw pump 2 to form liquid-containing tobacco stems. The liquid-containing tobacco stems are squeezed by the rotation of the third conveying screw 31 in the tobacco stem squeezing machine 3, to achieve solid-liquid separation (separation of washed tobacco stems and washing stem solvent) and discharge part of the liquid from the tobacco stem squeezing machine 3;

[0083] At this time, the tobacco stem bin 4 is rotated so that the opening of the fourth feeding / discharge channel 41 faces upward and is aligned with the third discharge port. The pneumatic gate valve 43 in the fourth feeding / discharge channel 41 is opened, and then the washed tobacco stems enter the tobacco stem bin 4 through the third discharge port and the fourth feeding / discharge channel 41. The dryness of the washed tobacco stems entering the tobacco stem bin 4 is (25-30) %. The operation frequency of the tobacco stem squeezing machine 3 is (30-35) HZ, and the back pressure is (0-2.0) bar;

[0084] After the feeding of this batch of washed tobacco stems is completed, the pneumatic gate valve 43 in the fourth feeding / discharge channel 41 is closed. Then, the tobacco stem bin 4 is rotated by half a circle every (8-10) min (the rotation period can be adjusted according to actual production), to mix and temporarily store the tobacco stems after solid-liquid separation in the tobacco stem bin 4;

[0085] 3) leaching: when the first stage leaching device 5 (i.e. mixed leaching equipment) of the subsequent process meets the feeding conditions, the fourth inlet / outlet channel 41 is rotated to the lower side of the tobacco stem bin 4, at this time the fourth inlet / outlet channel 41 and the fifth feeding port 51 are aligned, the pneumatic gate valve 43 is opened, the washed tobacco stems are discharged under the pushing of the fourth conveying screw 42 through the fourth inlet / outlet channel 41, and enter the first stage leaching device 5 from the fifth feeding port 51, and the discharge speed of the washed tobacco stems is controlled by adjusting the rotation frequency (44-48) HZ of the fourth conveying screw 42;

[0086] When the washed tobacco stems enter the first stage leaching device 5, (1500-1800) kg of formula tobacco dust is sent into the first stage leaching device 5 through the tobacco dust feeding port 53 at the top end of the first stage leaching device 5, and leaching solvent is added through the liquid inlet 54 at the top end of the first stage leaching device 5, the total feeding time of the washed tobacco stems and the formula tobacco dust is controlled to be within 8 min, after the washed tobacco stems and the formula tobacco dust enter the first stage leaching device 5, the pneumatic gate valve 43 of the fourth inlet / outlet channel 41 is closed, at this time the start point of a leaching period begins to leach, the leaching solvent is (50-65) ℃ water, the addition amount is (10-12) m 3 After leaching is completed, the material is unloaded through the fifth discharge port 52 and discharged to the next process;

[0087] At the same time, when a leaching period ends, the fourth inlet / outlet channel 41 is rotated to the upper side of the tobacco stem bin 4, and the feeding and temporary storage of the next batch of washed tobacco stems in the tobacco stem bin 4 begin;

[0088] The mixed leaching time in the first stage leaching device 5 is (50-60) min.

[0089] The present application realizes the periodic temporary storage of tobacco stems by the periodic opening and closing of the pneumatic gate valve 43, the periodic alignment of the third discharge port and the fourth inlet / outlet channel 41, and the periodic alignment of the fourth inlet / outlet channel 41 and the fifth feeding port 51.

[0090] In the present application, by setting the rotatable tobacco stem bin 4, designing the fourth conveying screw 42 to be located at one side of the tobacco stem bin 4 close to the fourth feeding and discharging channel 41, and the axial center line of the fourth conveying screw 42 deviates from the axial center line of the tobacco stem bin 4, and designing the fourth feeding and discharging channel 41 as a channel combining the feeding channel and the discharging channel, the problem of the washed tobacco stem being compacted and bridged to be unable to discharge can be effectively avoided, and each batch of washed tobacco stem can be rotated to the position where the fourth feeding and discharging channel 41 is aligned with the fifth feeding port 51, so that the washed tobacco stem can be fed into the first-stage leaching device 5 (i.e. the mixed leaching equipment) in a short time interval of the rotation of the tobacco stem bin 4, the homogenization and sufficient leaching of the tobacco effective substances are realized while the mixed leaching time is ensured, and the quality stability of the leaching liquid is ensured.

[0091] The quality of the leaching liquid obtained by using the system and method of the present application is detected.

[0092] In the following detection, the method of the present application is not used as the pre-optimization result, and the method of the present application is used as the post-optimization result.

[0093] Detection I:

[0094] In detection I, 12 groups of washed tobacco stem samples processed by the system and method of the present application are selected, the hot water soluble content in the washed tobacco stem samples is detected, the relative standard deviation (RSD) value of the hot water soluble content of the washed tobacco stem is calculated, and the washed tobacco stem samples under the original tank-type tobacco stem washing process are compared, and the results are shown in Table 1.

[0095] Table 1 Comparison of hot water soluble content stability of washed tobacco stem

[0096]

[0097]

[0098] The comparison results of detection I show that, in the production process of the paper-making reconstituted tobacco, by optimizing the design of the tobacco stem washing method by the system and method of the present application, the RSD value of the hot water soluble content of the washed tobacco stem is reduced from 6.98% under the original tank-type tobacco stem washing process to 3.31%, and the quality stability of the washed tobacco stem is obviously improved, which provides quality stable materials for the mixed leaching process.

[0099] Detection II:

[0100] In detection II, the leaching yield of the mixed leaching process of 12 continuous production shifts processed by the system and method of the present application is tracked and analyzed, the relative standard deviation (RSD) value is calculated, and the results are compared with those under the original tank-type tobacco stem washing process, and the results are shown in Table 2.

[0101] Table 2 Comparison of mixed leaching yield stability

[0102]

[0103]

[0104] The comparison results of the detection two show that, in the production process of the paper-making method reconstituted tobacco, through the optimization design of the washing stem process and the addition of the rotary tobacco stem bin, the RSD value of the mixed leaching yield is reduced from 5.06% under the original process to 3.16%, and the control stability of the mixed leaching process condition is obviously improved.

[0105] Detection three:

[0106] In the detection three, 12 groups of leaching liquid samples after being processed by the system and the method of the application and mixed leaching are selected, the solid content of the leaching liquid is detected, the relative standard deviation (RSD) value is calculated, and the solid content of the leaching liquid under the original tank-type washing stem process is compared, and the results are shown in Table 3.

[0107] Table 3 Comparison of stability of solid content of leaching liquid

[0108]

[0109]

[0110] The comparison results of the detection three show that, in the production process of the paper-making method reconstituted tobacco, through the optimization design of the washing stem process and the addition of the rotary tobacco stem bin, the RSD value of the solid content of the leaching liquid is reduced from 8.74% under the original process to 4.68%, the quality stability of the leaching liquid is improved, and the quality stability of the paper-making method reconstituted tobacco is effectively ensured.

[0111] From the above detection results, it can be seen that the system and the method of the application can improve the control precision of the washing stem and mixed leaching process conditions, so that the washed tobacco stems can quickly enter the mixed leaching equipment after being temporarily stored in the tobacco stem bin for a short time, ensure the quality stability of the washed tobacco stems, realize the uniform and sufficient leaching of the effective substances in the tobacco, fully play the buffering function of the tobacco stem bin, meet the quality demand of the leaching liquid, ensure the quality stability, improve the operation efficiency of the mixed leaching equipment, and reduce the production energy consumption.

[0112] Finally, it should be explained that: the above is only the preferred embodiment of the application and the application of technical principles. Those skilled in the art will understand that the application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the protection scope of the application. Therefore, although the application is described in more detail through the above embodiments, the application is not limited to the specific embodiments described herein, and can include more other effective embodiments without departing from the concept of the application, and the scope of the application is determined by the scope of the appended claims.

Claims

1. A system for achieving stable quality of papermaking process reconstituted tobacco leaf extract, characterized in that: It includes a stem washer, a screw pump, a stem squeezer, a rotary stem silo and a first-stage extraction device; The stem washer includes a rotating drum and a first conveying screw disposed within the rotating drum; the rotating drum is horizontally disposed, with its left and right ends closed, a first feed opening provided on the upper side wall of the rotating drum, and a first discharge opening provided on the lower side wall of the rotating drum; the rotating drum is rotatable about its axial centerline, and the first conveying screw is rotatable relative to the rotating drum within the rotating drum; The screw pump is arranged horizontally, and a second feed port is provided on the upper side wall of the screw pump. The left end of the screw pump is closed, and a second discharge port is provided on the right end of the screw pump. A second conveying screw is provided inside the screw pump along the direction in which the screw pump extends, and the second conveying screw can rotate relative to the screw pump in the screw pump. The first discharge port is connected to the second feed port through a pipeline. The tobacco stem squeezer is arranged horizontally, with its left and right ends closed. A third feed port is provided on the upper side wall of the tobacco stem squeezer, and a third discharge port is provided on the lower side wall of the tobacco stem squeezer. A third conveying screw is provided inside the tobacco stem squeezer along the direction in which the tobacco stem squeezer extends, and the third conveying screw can rotate relative to the tobacco stem squeezer in the tobacco stem squeezer. The second discharge port is connected to the third feed port through a pipeline. The rotary tobacco stem silo is arranged horizontally, with its left and right ends closed. A fourth inlet / outlet channel is provided on the upper side wall of the rotary tobacco stem silo, and the extension direction of the fourth inlet / outlet channel is perpendicular to the extension direction of the rotary tobacco stem silo; a valve is provided at the entrance of the fourth inlet / outlet channel, and the valve can control the opening and closing of the fourth inlet / outlet channel; a fourth conveying screw is provided in the rotary tobacco stem silo along the extension direction of the rotary tobacco stem silo, and the fourth conveying screw can rotate relative to the rotary tobacco stem silo in the rotary tobacco stem silo; The shaft end of the fourth conveying screw extends rightward out of the rotary tobacco stem silo, and the shaft end of the fourth conveying screw is connected to a fourth working motor; the fourth conveying screw is located on a side of the rotary tobacco stem silo near the fourth inlet / outlet channel, and the axial centerline of the fourth conveying screw deviates from the axial centerline of the rotary tobacco stem silo; The top of the first-stage leaching device is provided with a fifth feed port, a tobacco powder feed port and a liquid inlet; the lower side wall of the first-stage leaching device is provided with a fifth discharge port; When the first-stage extraction device meets the feeding conditions, the fourth inlet / outlet channel rotates to align with the fifth feed port, the valve in the fourth inlet / outlet channel opens, the washed tobacco stems are discharged through the fourth inlet / outlet channel, and enter the first-stage extraction device from the fifth feed port.

2. The system according to claim 1, wherein: The first conveying screw extends along the extension direction of the rotating drum, and the axial end of the first conveying screw extends rightward out of the rotating drum. The axial end of the first conveying screw is connected to the first working motor; the axial center line of the first conveying screw coincides with the axial center line of the rotating drum.

3. The system according to claim 1, wherein: The shaft end of the second conveying screw extends to the left from the screw pump, and the shaft end of the second conveying screw is connected to the second working motor; the axial center line of the second conveying screw coincides with the axial center line of the screw pump.

4. The system according to claim 1, wherein: The axial end of the third conveying screw extends to the right out of the tobacco stem squeezing machine, and the axial end of the third conveying screw is connected to a third working motor; the axial center line of the third conveying screw coincides with the axial center line of the tobacco stem squeezing machine.

5. A method for stabilizing the quality of a papermaking reconstituted tobacco leaf extract using the system according to any one of claims 1 to 4, characterized in that: The steps include: 1) Stem washing: The tobacco stems used in papermaking and the stem washing solvent are fed into the rotating drum of the stem washer for stem washing; 2) Squeezing and temporary storage: The washed tobacco stems and the stem washing solvent processed by the stem washer are transported to the tobacco stem squeezer via a screw pump for squeezing, thereby separating the washed tobacco stems from the stem washing solvent; At this time, the rotary tobacco stem silo rotates so that the opening of the fourth inlet / outlet channel is aligned with the third outlet, the valve in the fourth inlet / outlet channel opens, and the washed tobacco stems then enter the rotary tobacco stem silo through the third outlet and the fourth inlet / outlet channel. After the feeding of this batch of washed tobacco stems is completed, the valve in the fourth inlet / outlet channel is closed, and the rotary tobacco stem silo rotates periodically, so that the washed tobacco stems are mixed and temporarily stored in the rotary tobacco stem silo; 3) Leaching: When the first-stage leaching device meets the feeding conditions, the fourth inlet / outlet channel rotates to align with the fifth inlet, the valve in the fourth inlet / outlet channel opens, and the washed tobacco stems are discharged through the fourth inlet / outlet channel and enter the first-stage leaching device from the fifth inlet; When the washed tobacco stems enter the first-stage extraction device, the formulated tobacco powder and extraction solvent are also fed into the first-stage extraction device. After the feeding is completed, the valve of the fourth inlet / outlet channel is closed, and extraction begins as the starting point of an extraction cycle. After the extraction is completed, the material is discharged to the next process.

6. The method for stabilizing the quality of the papermaking process reconstituted tobacco extract according to claim 5, characterized in that: In step 1), the solid-liquid ratio of the formulated tobacco stems to the stem washing solvent is 1kg: (10-14)m 3 ; The temperature of the stem washing solvent in step 1) is (30~50)℃.

7. The method for stabilizing the quality of the papermaking process reconstituted tobacco extract according to claim 5, characterized in that: During stem washing in step 1), the rotary drum rotates about its axial centerline, and simultaneously the first conveying screw rotates relative to the rotary drum in the rotary drum; the rotation frequency of the rotary drum is (20-30) Hz, and the rotation frequency of the first conveying screw is (32-36) Hz.

8. The method for stabilizing the quality of the papermaking process reconstituted tobacco extract according to claim 5, characterized in that: In step 3), when the first-stage leaching device is fed, the rotation frequency of the fourth conveying screw is (44~48) Hz.

9. The method for stabilizing the quality of the papermaking process reconstituted tobacco extract according to claim 5, characterized in that: In step 3), the leaching solvent temperature is (50-65)°C; in step 3), the mixed leaching time in the first-stage leaching device is (50-60) minutes.

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