A papermaking process reconstituted tobacco raw material homogenization treatment system and method

Abstract

The application discloses a papermaking method reconstituted tobacco raw material homogenization treatment system and method, which comprises a rotating drum, a raw material mixing tank, a metering and weighing screw conveyor and multiple conveying screws, pipelines and valves. The raw material enters the rotating drum through a first feeding port, realizes first-stage mixing treatment and moisture control through continuous tumbling, then enters the raw material mixing tank through a second feeding port under the conveying of a first conveying screw, the raw material mixing tank is provided with multiple conveying screws to realize second-stage mixing treatment of formula raw materials, the raw material treated by the raw material mixing tank enters the metering and weighing screw conveyor through a second discharging port and then enters the next process. The system realizes moisture content control and homogenization mixing of papermaking method reconstituted tobacco raw materials, ensures uniformity of formula raw material mixing, and has smooth discharging, solves the problems of easy blockage of existing equipment, resulting in poor discharging, and influence of raw material moisture content fluctuation on equipment operation stability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of reconstituted tobacco production, and particularly relates to a papermaking method reconstituted tobacco raw material homogenization treatment system and method. TECHNICAL BACKGROUND

[0002] The papermaking method is also called "two-step method", which is another preparation method of reconstituted tobacco different from the roll-pressing method and the thick slurry method. The tobacco raw materials used in the papermaking method reconstituted tobacco mainly include tobacco stems, tobacco dust, tobacco ash rods and tobacco leaf fragments. These raw materials mainly come from by-products generated in the processes of tobacco threshing, tobacco processing and tobacco conditioning, purchasing, transportation, storage and processing, and have the characteristics of wide sources, mixed components, poor quality stability, poor uniformity and difficult control. Generally, the raw materials for the production of the papermaking method reconstituted tobacco are not composed of a single kind of raw material. Different papermaking method reconstituted tobacco products have their corresponding raw material formulations. In the actual production process, the stem and dust raw materials need to be mixed according to the types, quantities and weights required by the raw material formulations. The mixed stem and dust raw material formulation is transported to the leaching process in batches and multiple times. Therefore, if the uniformity of the mixed stem and dust raw materials cannot be guaranteed, the uniformity of the raw materials in each batch and between batches transported to the leaching process will be difficult to control, which will directly affect the production and product quality stability of the reconstituted tobacco.

[0003] At present, the stem and dust raw material mixing equipment used by the industry is mainly a vertical mixing tank. Because the stem and dust raw materials, especially the tobacco dust and tobacco leaf fragments, have poor fluidity, and the moisture content of the raw materials is high in summer or rainy weather environment, the lifting screw at the center of the tank body is prone to form a hollow area at the bottom of the tank body during the lifting of the materials, which causes poor material flow. At the same time, the bottom of the tank body is a conical structure, which is difficult to clean. As the use time of the mixing tank increases, a thick layer of tobacco dust will accumulate on the tank wall. When the materials lifted by the lifting screw are thrown on the tank wall, bridging and clogging are easily caused. In the actual production process, the phenomenon of overflow of the stem and dust raw materials from the feeding port of the mixing tank or poor discharge of the stem and dust raw materials occurs from time to time. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a papermaking method reconstituted tobacco raw material homogenization treatment system and method, which realizes the moisture content control and homogenization mixing of the papermaking method reconstituted tobacco raw materials. The technical solution adopted to achieve the above purpose is as follows:

[0005] A papermaking method reconstituted tobacco raw material homogenization treatment system, including a rotating drum, a raw material mixing tank, a metering weighing screw conveyor and a plurality of conveying screws, pipelines and valves, characterized in that: the rotating drum is provided with a first feeding port on the left side, and is connected with a first conveying screw through a first discharging port on the right side; the first conveying screw is connected to the raw material mixing tank through a second feeding port; the raw material mixing tank is provided with a second conveying screw, a third conveying screw, a fourth conveying screw and a fifth conveying screw along the horizontal direction from top to bottom; the bottom of the raw material mixing tank is provided with a second discharging port, and the second discharging port is connected with the metering weighing screw conveyor.

[0006] Further, the rotating drum is composed of a cylinder, a drum conveying screw, a heating device, a moisture discharge valve and a dust removal device; the conveying screw is arranged in the cylinder; the cylinder is provided with the moisture discharge valve at the bottom; the moisture discharge valve is an automatic regulating valve; the dust removal device is arranged on the right side of the cylinder and above the first discharging port.

[0007] Further, the heating device is a combination of a drum heat exchange plate and a hot air device; the hot air device is arranged on the left side of the cylinder; the hot air device comprises a hot air pipeline which is connected to the cylinder from the opening on the top left side of the cylinder; the hot air pipeline is provided with a hot air valve; the temperature of the hot air in the hot air pipeline is (100-120)℃; the drum heat exchange plate is arranged on the right side of the cylinder and is connected with a steam pipeline; the steam pipeline is sequentially provided with a rotary joint and a steam valve; the temperature of the drum heat exchange plate is ≤100℃; the length-diameter ratio of the cylinder is (4.5-6.5):1; the inclination of the cylinder is (1.5-3.0)°.

[0008] Further, the conveying speed of the first conveying screw is (18-25) r / min; the upper side of the cylinder wall of the first conveying screw is provided with an opening of (300×300) mm; a moisture content detection device is arranged above the opening; the drum heat exchange plate, the hot air device and the moisture content detection device are connected and set by PID; the set value of the moisture content of the formula raw material at the outlet of the rotating drum is ≤12.5%, so as to prevent the problems of bridging and blocking of the raw material mixing tank caused by excessive moisture of the formula raw material.

[0009] Further, the second conveying screw and the third conveying screw are arranged at the same horizontal position and have the same conveying direction; the fourth conveying screw and the fifth conveying screw are arranged at the same horizontal position and have the same conveying direction; the conveying directions of the second and third conveying screws and the fourth and fifth conveying screws are opposite; the second and third conveying screws are arranged above the fourth and fifth conveying screws; the conveying speed of the second and third conveying screws is (20-25) r / min; the conveying speed of the fourth and fifth conveying screws is (15-30) r / min.

[0010] Further, the center position of the raw material mixing tank is vertically provided with a center rotating shaft, and the side and bottom of the raw material mixing tank is provided with a scraper, the side scraper is connected to the center rotating shaft through a scraper connecting rod, and the bottom scraper is directly connected to the center rotating shaft.

[0011] Further, the side of the raw material mixing tank is provided with six scrapers, and the bottom is provided with one scraper, the scraper is designed with a hollow sleeve with a length of 10 cm, the hollow sleeve of the side scraper is connected to the scraper connecting rod through a lock buckle, and the hollow sleeve of the bottom scraper is connected to the center rotating shaft of the raw material mixing tank through a lock buckle.

[0012] Further, the raw material mixing tank is a short and thick cylindrical tank body, the diameter of the tank body is (9-10) m, the height of the tank body is (3-3.5) m, and the volume of the tank body is (190-270) m 3 .

[0013] Further, the metering and weighing screw conveyor can realize real-time flow and cumulative weight metering of the formula raw material.

[0014] The application also discloses a method for homogenizing treatment of raw materials of paper-making reconstituted tobacco.

[0015] Step A: the premixed formula raw materials of paper-making reconstituted tobacco enter the rotary drum through the first feeding port, and realize first-stage mixing treatment and moisture content control through continuous tumbling and drying.

[0016] Step B: the formula raw materials treated by the rotary drum enter the raw material mixing tank through the second feeding port under the first conveying screw conveyor, and realize second-stage mixing treatment through continuous horizontal and vertical tumbling under the action of the second and third conveying screws and the fourth and fifth conveying screws which are arranged in a staggered manner and have opposite running directions.

[0017] Step C: the formula raw materials treated by the raw material mixing tank enter the metering and weighing screw conveyor through the second discharging port, and enter the next process stably and uniformly at a certain flow under the metering and weighing conveying.

[0018] The application has the beneficial effects that the moisture content control and homogenization mixing of the raw materials of paper-making reconstituted tobacco are realized, the uniformity of the formula raw materials is ensured, meanwhile, the system has smooth discharging, the problems that the existing equipment is prone to blockage, the discharging is not smooth, and the running stability of the equipment is affected by the moisture content fluctuation of the raw materials are solved, the actual weight of the raw materials entering the leaching process is effectively controlled, the production lean level is improved, and good application evaluation is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is a device structure schematic view of the application;

[0020] Fig. 2 Figure 2 is a top view of the raw material mixing tank of the device of the present application;

[0021] Fig. 3 Figure 4 is an enlarged view of part A.

[0022] 1, rotating drum; 2, raw material mixing tank; 3, first conveying screw; 4, side wall scraper; 5, bottom scraper; 11, first feeding port; 12, first discharging port; 13, drum body; 14, drum conveying screw; 15, hot air device; 151, hot air pipeline; 152, hot air valve; 16, drum heat exchange plate; 161, steam pipeline; 162, steam valve; 163, rotating joint; 17, moisture removal valve; 18, dust removal device; 19, water content detection device; 21, second feeding port; 22, second conveying screw; 23, third conveying screw; 24, fourth conveying screw; 25, fifth conveying screw; 26, metering and weighing screw conveyor; 27, second discharging port; 28, central rotating shaft; 29, rotating shaft motor; 41, hollow sleeve; 42, lock catch; 43, scraper connecting rod. DETAILED DESCRIPTION

[0023] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0024] Example 1

[0025] As Figs. 1-3As shown, the embodiment discloses a papermaking method reconstituted tobacco raw material homogenization treatment system, a rotating drum 1, a raw material mixing tank 2, a metering weighing screw conveyor 26 and a plurality of conveying screws, pipelines and valves, the left side of the rotating drum 1 is provided with a first feeding port 11, the right side is connected with the first conveying screw 3 through the first discharging port 12, and the first conveying screw 3 is connected to the raw material mixing tank 2 through the second feeding port 21; the rotating drum 1 is composed of a cylinder body 13, a drum conveying screw 14, a heating device, a moisture discharge valve 17 and a dust removal device 18, the length-diameter ratio of the cylinder body 13 is (4.5~6.5):1, the specific diameter is (1.0~1.5)m, the length is (7~9)m, the inclination of the cylinder body 13 is (1.5~3.0)°, the drum conveying screw 14 is arranged in the cylinder body 13, the bottom of the cylinder body 13 is provided with the moisture discharge valve 17, the moisture discharge valve 17 is an automatic regulating valve, the right side of the cylinder body 13 is provided with the dust removal device 18, the dust removal device 18 is located above the first discharging port 12, the heating device is a combination of a hot air device 15 and a drum heat exchange plate 16, the formula raw material in the rotating drum 1 is heated by the drum heat exchange plate 16 and the hot air entering the drum at the same time, the hot air device 15 is arranged on the left side of the cylinder body 13, below the first feeding port 11, a hot air pipeline 151 is connected to the cylinder body 13 from the left side opening of the cylinder body 13, a hot air valve 152 is arranged on the hot air pipeline 151, the temperature of the hot air in the hot air pipeline 151 is (100~120)℃, the drum heat exchange plate 16 is arranged on the right side of the cylinder body 13, the drum heat exchange plate 16 is connected with a steam pipeline 161, a rotary joint 163 and a steam valve 162 are sequentially arranged on the steam pipeline 161, the temperature adjustment of the drum heat exchange plate 16 is realized by adjusting the opening degree of the steam valve 162, the rotary joint 163 realizes the rotation of the drum heat exchange plate 163 with the cylinder body 13, and the temperature of the drum heat exchange plate 16 is ≤100℃.

[0026] The moisture content detection device 19 is arranged above the first conveying screw 3, and the drum heat exchange plate 16, the hot air device 15 and the moisture content detection device 19 are connected in a PID interlocking manner.

[0027] When the moisture content of the material at the first discharging port 12 deviates from the set range, the set temperature of the drum heat exchange plate 16 is kept unchanged or the opening degree of the hot air valve 152 is adjusted to realize the first-stage adjustment; if the opening degree of the hot air valve 152 is ≥90%, the moisture content of the material still does not reach the set range requirement within 5 minutes, then the opening degree of the steam valve 162 is adjusted on the basis of the opening degree adjustment of the hot air valve 152, so as to realize the second-stage adjustment.

[0028] The second conveying screw 22, the third conveying screw 23, the fourth conveying screw 24 and the fifth conveying screw 25 are horizontally arranged in the raw material mixing tank 2 in parallel from top to bottom, the second conveying screw 22 and the third conveying screw 23 are arranged at the same horizontal position and have the same conveying direction, the fourth conveying screw 24 and the fifth conveying screw 25 are arranged at the same horizontal position and have the same conveying direction, the conveying directions of the second conveying screw 22 and the third conveying screw 23 are opposite to those of the fourth conveying screw 24 and the fifth conveying screw 25, the second conveying screw 22 and the third conveying screw 23 are arranged above the fourth conveying screw 24 and the fifth conveying screw 25 in a staggered manner, and the metering and weighing screw conveyor 26 can measure the real-time flow and the cumulative weight of the formula raw material.

[0029] The center rotating shaft 28 is vertically arranged at the center position of the raw material mixing tank 2 and connected with the rotating shaft motor 29 arranged above the raw material mixing tank 2, the six side wall scrapers 4 are arranged in pairs and divided into three groups, the first group of side wall scrapers 4 is arranged above the second conveying screw 22 and the third conveying screw 23, the second group of side wall scrapers 4 is arranged between the second conveying screw 22, the third conveying screw 23, the fourth conveying screw 24 and the fifth conveying screw 25, and the third group of side wall scrapers 4 is arranged below the fourth conveying screw 24 and the fifth conveying screw 25, the hollow sleeve 41 with a length of 10 cm is arranged at the middle position of each side wall scraper 4, the scraper connecting rod 43 is inserted into the hollow sleeve 41 at one end and fastened by the lock 42 at the connecting position, and the other end of the scraper connecting rod 43 is fixedly connected with the center rotating shaft 28, and the hollow sleeve 41 on the bottom scraper 5 is locked with the center rotating shaft 28.

[0030] When the system is used, the premixed formula raw material of the papermaking method reconstituted tobacco is fed into the rotating drum 1 through the first feeding port 11, the rotating speed of the drum body 13 of the rotating drum 1 is (7-18) r / min, the rotating speed of the drum conveying screw 14 is (15-22) r / min, the formula raw material is continuously rolled and mixed under the action of the continuously rotating drum body 13 and the drum conveying screw 14, and the moisture content of the formula raw material is controlled, so that the moisture content of the raw material at the first discharging port 12 is less than or equal to 12.5%.

[0031] The formula raw material treated by the rotating drum 1 is conveyed by the first conveying screw 3 and fed into the raw material mixing tank 2 through the second feeding port 21, the raw material mixing tank 2 is a cylindrical tank body with a large height and a small diameter, which can avoid the problem that the raw material in the tank body is compacted and cannot be smoothly discharged due to the high height and the small diameter of the tank body, the diameter of the tank body is (9-10) m, the height of the tank body is (3-3.5) m, and the volume of the tank body is (190-270) m 3The raw material mixing tank 2 is provided with a second discharge port 27, and the operation mode is divided into a "mixing mode" and a "discharge mode".

[0032] The bottom of the raw material mixing tank 2 is provided with a second discharge port 27, and the operation mode is divided into a "mixing mode" and a "discharge mode". When the operation mode is the "mixing mode", the conveying directions of the second conveying screw 22 and the third conveying screw 23 are opposite to the conveying directions of the fourth conveying screw 24 and the fifth conveying screw 25, the conveying speeds of the second conveying screw 22 and the third conveying screw 23 are (20-25) r / min, and the conveying speeds of the fourth conveying screw 24 and the fifth conveying screw 25 are (15-30) r / min. The raw materials in the tank body are continuously circulated and rolled from top to bottom, and the raw materials in the whole tank body are uniformly mixed in the horizontal and vertical directions due to the staggered arrangement of the second conveying screw 22, the third conveying screw 23, the fourth conveying screw 24 and the fifth conveying screw 25, so that the second-stage mixing treatment of the raw materials is realized, and the raw materials in the tank body are prevented from accumulating in the same direction during the mixing process to avoid the bridging and blocking problems. When the operation mode is the "discharge mode", the second conveying screw 22 and the third conveying screw 23 stop running, and the fourth conveying screw 24 and the fifth conveying screw 25 convey the raw materials to the second discharge port 27. The raw material mixing tank 2 is provided with six side wall scrapers 4 and one bottom scraper 5, so that the raw materials hanging on the tank wall can be cleaned in time, and the bridging and blocking problems of the materials in the mixing tank caused by the gradual accumulation of the hanging raw materials are avoided.

[0033] The raw materials treated by the raw material mixing tank 2 enter the metering and weighing screw conveyor 26 through the second discharge port 27, and then enter the next process under the conveying of the metering and weighing screw conveyor 26. The metering and weighing screw conveyor 26 can measure the real-time flow and cumulative weight of the raw materials.

[0034] The specific control method of the control system of the application comprises the following steps:

[0035] Step A: The premixed papermaking process reconstituted tobacco formula raw materials enter the rotary drum 1 through the first feeding port 11, and are continuously rolled and dried to realize the first-stage mixing treatment and moisture content control.

[0036] Step B: The raw materials treated by the rotary drum 1 enter the raw material mixing tank 2 through the second feeding port 21 under the conveying of the first conveying screw 3, and are continuously circulated and rolled in the horizontal and vertical directions under the action of the second conveying screw 22, the third conveying screw 23 and the fourth conveying screw 24 and the fifth conveying screw 25 arranged in the raw material mixing tank 2 in a staggered manner and having opposite running directions, so that the second-stage mixing treatment of the raw materials is realized.

[0037] Step C: The formula raw materials treated by the raw material mixing tank 2 enter the metering and weighing screw conveyor 26 through the second discharge port 27, and are stably and uniformly fed into the next process at a certain flow rate under the metering and weighing conveying.

[0038] The reconstituted tobacco formula raw materials treated by the system and method of the present application are detected.

[0039] Detection result one:

[0040] The papermaking process reconstituted tobacco formula raw materials treated by the homogenization treatment system are selected for detection of moisture content, and the moisture content RSD value is calculated, and compared with the papermaking process reconstituted tobacco formula raw materials not treated by the homogenization treatment system. The results are shown in Table 1.

[0041] Table 1 Comparison of moisture content of papermaking process reconstituted tobacco formula raw materials before and after homogenization treatment

[0042]

[0043] The comparison results of detection one show that the moisture content RSD value of the papermaking process reconstituted tobacco formula raw materials is reduced from 16.1% to 5.3% by controlling the moisture content of the papermaking process reconstituted tobacco formula raw materials by the system and method of the present application, and the stability of the formula raw materials is obviously improved, and the problems of bridging and blocking of the formula raw materials during mixing caused by the seasonal environmental condition changes are eliminated.

[0044] Detection result two:

[0045] The papermaking process reconstituted tobacco formula raw materials treated by the homogenization treatment system are selected for detection of the fluctuation of the content of the conventional chemical components, and compared with the papermaking process reconstituted tobacco formula raw materials not treated by the homogenization treatment system. The results are shown in Table 2.

[0046] Table 2 Comparison of conventional chemical components of papermaking process reconstituted tobacco formula raw materials before and after homogenization treatment

[0047]

[0048] The comparison results of detection two show that the fluctuation of the content of total sugar, nicotine, chlorine and potassium of the papermaking process reconstituted tobacco formula raw materials is reduced to different degrees by homogenizing the papermaking process reconstituted tobacco formula raw materials by the system and method of the present application, and the reduction of the fluctuation of the content of total sugar and potassium is the most significant, in which the fluctuation of the content of total sugar is reduced from 14.8% to 6.3%, and the fluctuation of the content of potassium is reduced from 11.0% to 5.6%, and the stability of the papermaking process reconstituted tobacco formula raw materials is improved, and the stability of the raw materials is provided for the extraction process, and the foundation for the performance stability of the papermaking process reconstituted tobacco product is laid.

Claims

1. A homogenization system for recycled tobacco raw materials used in papermaking, comprising a rotary drum, a raw material mixing tank, a metering and weighing screw conveyor, and multiple conveying screws, pipelines, and valves, characterized in that: The rotating drum has a first feed inlet on the left side and a first discharge outlet on the right side connected to the first conveying screw. The first conveying screw is connected to the raw material mixing tank through the second feed inlet. The raw material mixing tank has a second conveying screw, a third conveying screw, a fourth conveying screw, and a fifth conveying screw arranged horizontally from top to bottom. The bottom of the raw material mixing tank has a second discharge outlet, which is connected to a metering and weighing screw conveyor. The rotating drum consists of a drum body, a drum conveying screw, a heating device, a dehumidification valve, and a dust removal device. The conveying screw is located inside the drum body, and a dehumidification valve is provided at the bottom of the drum body. The dehumidification valve is an automatic regulating valve. A dust removal device is provided on the right side of the drum body, and the dust removal device is located above the first discharge port. The heating device is a combination of a drum heat exchange plate and a hot air device, with the hot air device located on the left side of the drum and the drum heat exchange plate located on the right side of the drum. An opening is provided on the upper side of the first conveying spiral drum wall, and a moisture content detection device is provided directly above the opening. The drum heat exchange plate, hot air device and moisture content detection device are interlocked using PID. The set value of the moisture content of the raw materials at the outlet of the rotating drum is ≤12.5%. The second and third conveying screws are at the same horizontal position and have the same conveying direction. The fourth and fifth conveying screws are at the same horizontal position and have the same conveying direction. The conveying directions of the second and third conveying screws and the fourth and fifth conveying screws are opposite. The second and third conveying screws are staggered and located above the fourth and fifth conveying screws. The conveying speed of the second and third conveying screws is 20~25 r / min, and the conveying speed of the fourth and fifth conveying screws is 15~30 r / min. The metering and weighing screw conveyor can realize the real-time flow rate and cumulative weight measurement of the raw materials in the formula.

2. The system according to claim 1, characterized in that: The hot air device includes a hot air duct that enters the cylinder from the upper left side. The hot air duct is equipped with a hot air valve. The hot air temperature inside the hot air duct is 100~120℃. The drum heat exchange plate is connected to a steam pipeline. The steam pipeline is equipped with a rotary joint and a steam valve in sequence. The temperature of the drum heat exchange plate is ≤100℃. The cylinder has a length-to-diameter ratio of (4.5~6.5):1 and an inclination of 1.5~3.0°.

3. The system according to claim 1, characterized in that: The first conveying screw has a conveying speed of 18~25 r / min.

4. The system according to claim 1, characterized in that: The raw material mixing tank has a central rotating shaft vertically positioned at its center. Scrapers are provided on the sides and bottom of the raw material mixing tank. The side scrapers are connected to the central rotating shaft via scraper connecting rods, and the bottom scrapers are directly connected to the central rotating shaft.

5. The system according to claim 4, characterized in that: The raw material mixing tank has 6 side wall scrapers on the side and 1 bottom scraper at the bottom. The scrapers are designed with a hollow sleeve with a length of 10cm. The hollow sleeve of the side wall scraper is locked to the scraper connecting rod. The hollow sleeve of the bottom scraper is locked to the central rotating shaft of the raw material mixing tank.

6. The system according to claim 1, characterized in that: The raw material mixing tank is a short, cylindrical tank with a diameter of 9-10m, a height of 3-3.5m, and a volume of 190-270m³. 3 .

7. A method for homogenization using the system according to any one of claims 1 to 6, characterized in that, Includes the following steps: Step A: The premixed raw materials for the papermaking reconstituted tobacco formula enter the rotating drum through the first feed inlet. Through continuous tumbling and drying, the first-stage mixing process and moisture content control are achieved. Step B: The raw materials processed by the rotating drum are conveyed by the first conveying screw and enter the raw material mixing tank through the second feed port. Under the action of the second, third and fourth and fifth conveying screws that are staggered and run in opposite directions, the raw materials are continuously circulated and tumbled in the horizontal and vertical directions to achieve the second stage of mixing of the raw materials. Step C: The raw materials processed in the raw material mixing tank enter the metering and weighing screw conveyor through the second discharge port, and enter the next process stably and evenly at a certain flow rate under the metering and weighing conveying.

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