Recovery apparatus for a reconstituted tobacco production system and a reconstituted tobacco production system

Abstract

This invention relates to a recycling device and a reconstituted tobacco production system. The recycling device for the reconstituted tobacco production system includes a white water recycling unit, a waste paper recycling unit (8), and a calcium carbonate supply unit. The white water recycling unit is configured to collect and treat white water generated during reconstituted tobacco production. The waste paper recycling unit (8) is configured to decompose waste paper generated during reconstituted tobacco production and obtain a first pulp. The calcium carbonate supply unit is configured to provide a calcium carbonate solution required for reconstituted tobacco production. At least one of the white water recycling unit, waste paper recycling unit, and calcium carbonate supply unit is used to prepare a second pulp with a preset calcium carbonate concentration required for reconstituted tobacco production. The reconstituted tobacco production system includes the aforementioned recycling device.

Description

Technical Field

[0001] This invention relates to the field of tobacco production technology, and in particular to a recycling device and a reconstituted tobacco production system. Background Technology

[0002] In the production of reconstituted tobacco, raw materials such as tobacco stems, fragments, and added fibers are pulped by a pulping machine. The resulting pulp contains both long fibers and a large number of small short fibers. During the paper forming process, due to their small physical size, fine fibers and calcium carbonate are easily lost into the white water with the filtrate. This reduces the input-output ratio of the substrate. At the same time, the large amount of fine fibers and calcium carbonate in the white water will flow into the wastewater treatment plant with the discharge of the white water. This causes calcification and reduced activity of bacteria in the activated sludge of the wastewater treatment plant, resulting in a decrease in wastewater treatment capacity and an increase in wastewater treatment costs. This does not meet the requirements of green environmental protection and cost reduction.

[0003] It should be noted that the information disclosed in the background section of this invention is intended only to enhance the understanding of the overall background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0004] This invention provides a recycling device and a reconstituted tobacco production system for recycling tobacco production, which can recycle and reuse white water and waste paper generated during the reconstituted tobacco production process.

[0005] According to one aspect of the present invention, a recycling device for a reconstituted tobacco production system is provided, comprising:

[0006] The white water recovery unit is configured to collect and treat the white water generated during the production of reconstituted tobacco.

[0007] Waste paper recycling equipment is configured to decompose waste paper generated during reconstituted tobacco production and obtain a first pulp; and

[0008] The calcium carbonate supply unit is configured to provide the calcium carbonate solution required in the production of reconstituted tobacco.

[0009] Among them, at least one of the white water recovery device, the waste paper recovery device, and the calcium carbonate supply device is used to prepare a second pulp with a preset calcium carbonate concentration required for the production of reconstituted tobacco.

[0010] In some embodiments, the white water recovery device is connected to the waste paper recovery device to convey small fibers contained in the white water to the waste paper recovery device.

[0011] In some embodiments, the white water recovery device includes a sedimentation tank, a first pipeline, and a second pipeline. The sedimentation tank is configured to settle white water to obtain supernatant and precipitate. The first pipeline is used to output the supernatant, and the second pipeline connects the sedimentation tank and the waste paper recovery device to transport the precipitate to the waste paper recovery device.

[0012] In some embodiments, the recycling equipment for the reconstituted tobacco production system further includes a washing tank and / or a thickening tank, which are connected to a first pipeline.

[0013] According to another aspect of the present invention, a reconstituted tobacco production system is provided, the reconstituted tobacco production system including the above-described recycling equipment for the reconstituted tobacco production system.

[0014] In some embodiments, the reconstituted tobacco production system further includes a pulping device for preparing a second pulp with a preset calcium carbonate concentration required for the production of reconstituted tobacco, and the pulping device is connected to at least one of a white water recovery device, a waste paper recovery device, and a calcium carbonate supply device.

[0015] In some embodiments, the calcium carbonate supply device includes a calcium carbonate mixing tank for preparing a calcium carbonate solution, the calcium carbonate mixing tank being connected to a slurry preparation device.

[0016] In some embodiments, at least one of the waste paper recycling device, calcium carbonate mixing tank, and pulp mixing device is equipped with an agitator.

[0017] In some embodiments, the reconstituted tobacco production system further includes a first detection device and a controller. The first detection device is configured to detect the calcium carbonate content of the substrate obtained by the second pulp forming process, and the controller is configured to adjust the flow rate of the connecting pipeline between the waste paper recycling device and the pulping device and / or the flow rate of the connecting pipeline between the calcium carbonate mixing tank and the pulping device based on the detection result of the first detection device.

[0018] In some embodiments, the reconstituted tobacco production system further includes a controller and a second detection device for detecting the calcium carbonate concentration of the first pulp, the controller being configured to adjust the flow rate of the connecting pipeline between the waste paper recycling device and the pulping device and / or the flow rate of the connecting pipeline between the calcium carbonate mixing tank and the pulping device based on the detection result of the second detection device.

[0019] In some embodiments, the reconstituted tobacco production system further includes a papermaking device connected to the pulping unit. The papermaking device is configured to perform papermaking forming processing on a second pulp. The papermaking device includes a forming device and a reinforcing agent preparation device and / or a retention aid preparation device. The reinforcing agent preparation device and / or the retention aid preparation device are connected to a connecting pipeline between the pulping unit and the forming device. The reinforcing agent preparation device is configured to prepare a reinforcing agent to improve the cohesiveness of fibers in the second pulp. The retention aid preparation device is configured to prepare a retention aid to improve the adhesion of fibers in the second pulp. The viscosity of the reinforcing agent is less than the viscosity of the retention aid.

[0020] In some embodiments, the papermaking equipment further includes a first mixing tank and a second mixing tank. The first mixing tank is connected to the slurry preparation device and the reinforcing agent preparation device, and the second mixing tank is connected to the retention aid preparation device. The second mixing tank is disposed between the first mixing tank and the forming device.

[0021] In some embodiments, the reinforcing agent preparation device includes a reinforcing agent preparation tank, a second feeding hopper, a first conveying pipe, a second conveying pipe, and a screw dosing machine. Both the first and second conveying pipes are configured to convey a first fluid into the reinforcing agent preparation tank, wherein the temperature of the first fluid conveyed by the second conveying pipe is greater than or equal to the temperature of the first fluid conveyed by the first conveying pipe. The second feeding hopper is configured to store reinforcing agent powder, and the outlet of the second feeding hopper is connected to the first conveying pipe. The screw dosing machine is disposed between the outlet of the second feeding hopper and the first conveying pipe.

[0022] In some embodiments, the retention aid preparation device includes a retention aid preparation tank, a third feeding bin, a third conveying pipe, and a mixing pipe. The third feeding bin is configured to store retention aid powder. The third conveying pipe is connected to the retention aid preparation tank and is configured to convey high-pressure fluid. The mixing pipe is disposed on the pipeline of the third conveying pipe, and the outlet of the third feeding bin is connected to the mixing pipe. The mixing pipe includes a variable diameter section whose flow area decreases along the flow direction of the fluid. When the high-pressure fluid flows through the variable diameter section, a negative pressure is generated to draw the retention aid powder into the third conveying pipe.

[0023] In some embodiments, the retention aid preparation apparatus further includes a fourth delivery pipe in communication with the retention aid preparation tank, the fourth delivery pipe being configured to deliver a second fluid into the retention aid preparation tank, the temperature of the second fluid being greater than the temperature of the high-pressure fluid.

[0024] In some embodiments, the reinforcing agent includes nonionic modified guar gum.

[0025] In some embodiments, the retention aid includes at least one of cationic modified guar gum, carboxymethyl cellulose, and chitosan.

[0026] Based on the above technical solutions, this invention collects and treats white water by setting up a white water recycling device, which avoids problems such as the inactivation of bacteria in activated sludge caused by direct discharge of white water into sewage treatment plants. It also allows for the reuse of components such as small fibers and calcium carbonate in the white water, reducing material waste. By setting up a waste paper recycling device, waste paper is broken down to form first pulp, which is then used in reconstituted tobacco production to further reduce material waste and increase the yield of reconstituted tobacco. By setting up a calcium carbonate supply device, the calcium carbonate required for pulping, pulp conditioning and other production processes can be supplied specifically. When using recycled white water or waste paper at the same time, the calcium carbonate supply device can work synergistically with the product after white water treatment or with the first pulp, or all three can be used simultaneously to obtain a suitable amount of calcium carbonate for pulping, pulp conditioning and other production processes. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 A schematic diagram of one embodiment of the reconstituted tobacco production system of the present invention is shown;

[0029] Figure 2 A schematic diagram of the mixing tube is shown in one embodiment of the reconstituted tobacco production system of the present invention.

[0030] In the picture:

[0031] 1. Sedimentation tank; 2. Collection pipeline; 3. First pipeline; 4. First flow meter; 5. First pump; 6. Second pump; 7. Second flow meter; 8. Waste paper recycling device; 9. First agitator; 10. Second detection device; 11. Fourth pump; 12. Fourth flow meter; 13. Third pipeline; 14. Calcium carbonate mixing tank; 15. Fourth pipeline; 16. Thirteenth flow meter; 17. First feeding hopper; 18. Second agitator; 19. Third pump; 20. Third flow meter; 21. First supply pipeline; 22. Second supply pipeline; 23. Third agitator; 24. Pulp mixing device; 25. Fifth pump; 26. Fifth flow meter; 27. First mixing tank; 28. Sixth pump; 29. ​​Sixth flow meter; 30. Second mixing tank; 31. Eleventh flow meter; 32. 33. Molding device; 34. First detection device; 35. First conveying pipe; 36. Twelfth flow meter; 37. Second feeding bin; 38. Screw dosing machine; 39. Second conveying pipe; 40. Ninth flow meter; 41. Reinforcing agent mixing tank; 42. Fourth agitator; 43. First liquid level sensor; 44. First temperature sensor; 45. Seventh pump; 46. Seventh flow meter; 47. Third conveying pipe; 48. Mixing pipe; 49. Fourth conveying pipe; 50. Tenth flow meter; 51. Retention aid mixing tank; 52. Second liquid level sensor; 53. Second temperature sensor; 54. Insulation layer; 55. Fifth agitator; 56. Eighth pump; 57. Eighth flow meter; 58. First control unit; 59. Second control unit; 60. Second pipeline. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "center," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0034] In the related technologies, some substandard waste paper and a large amount of white water are generated during the production of reconstituted tobacco. These waste paper and white water usually contain small fibers, calcium carbonate and other substances. Direct discharge into the sewage treatment plant will not only lead to the loss of reconstituted tobacco raw materials, but also easily cause the bacteria in the activated sludge of the sewage treatment plant to calcify, reduce their activity and treatment capacity, and increase the cost of sewage treatment.

[0035] Therefore, this invention provides a recycling device for a reconstituted tobacco production system, used to recycle and reuse waste paper and white water generated during the reconstituted tobacco production process. (Refer to...) Figure 1 As shown, in some embodiments, the recycling equipment for the reconstituted tobacco production system includes a white water recycling device, a waste paper recycling device 8, and a calcium carbonate supply device. The white water recycling device is configured to collect and treat the white water generated during reconstituted tobacco production; the waste paper recycling device 8 is configured to decompose the waste paper generated during reconstituted tobacco production to obtain a first pulp; and the calcium carbonate supply device is configured to provide the calcium carbonate solution required for reconstituted tobacco production. At least one of the white water recycling device, waste paper recycling device, and calcium carbonate supply device is used to prepare a second pulp with a preset calcium carbonate concentration required for reconstituted tobacco production.

[0036] White water typically originates from processes such as washing and thickening in reconstituted tobacco production. It contains a large amount of fine fibers and calcium carbonate. By installing a white water recovery device to collect and treat the white water, problems such as the inactivation of bacteria in the activated sludge caused by direct discharge into the wastewater treatment plant can be avoided. Furthermore, the fine fibers and calcium carbonate in the white water can be reused, reducing material waste. Waste paper, on the other hand, refers to substandard substrate produced during reconstituted tobacco production. It is not suitable for direct use and also contains calcium carbonate and a large amount of fiber; direct disposal would result in material waste. Therefore, a waste paper recovery device 8 is installed to dispose of the waste paper. The formation of the first pulp facilitates its further utilization in the production of reconstituted tobacco, such as in pulping and conditioning processes, thereby reducing material waste and increasing the yield (input-output ratio) of reconstituted tobacco. By setting up a calcium carbonate supply device, the calcium carbonate required for pulping and conditioning processes can be supplied specifically. When using recycled white water or waste paper, the calcium carbonate supply device can work synergistically with the treated white water or the first pulp, or all three can be used simultaneously, to obtain a suitable amount of calcium carbonate for pulping and conditioning processes.

[0037] By simultaneously equipping the recycling equipment used in the reconstituted tobacco production system with a white water recycling unit, a waste paper recycling unit, and a calcium carbonate supply unit, the demand can be met when one or two of the units are unable to provide calcium carbonate or cannot meet the demand.

[0038] To simplify the processing flow, the small fibers in the white water and the waste paper generated in other processes of reconstituted tobacco production can be processed together (the processing principle for small fibers and waste paper is the same, which is to break the fibers to a size suitable for pulping). Therefore, in some embodiments, the white water recycling device is connected to the waste paper recycling device 8 to transport the small fibers contained in the white water to the waste paper recycling device 8.

[0039] In addition to small fibers, white water also contains other usable components (such as calcium carbonate and water). In some embodiments, the white water recycling device includes a sedimentation tank 1, a first pipeline 3, and a second pipeline 60. The sedimentation tank 1 is configured to precipitate the white water to obtain a supernatant and a precipitate. The precipitate contains small fibers and calcium carbonate. The first pipeline 3 is used to output the supernatant. The second pipeline 60 connects the sedimentation tank 1 and the waste paper recycling device 8 to transport the precipitate to the waste paper recycling device 8.

[0040] refer to Figure 1 As shown, in some embodiments, the white water recovery device further includes a collection pipeline 2, which is used to recover the white water generated in the relevant processes of the reconstituted tobacco production process and input it into a sedimentation tank.

[0041] By allowing the white water to settle in the sedimentation tank 1, the small fibers and calcium carbonate in the white water are precipitated to the lower layer of the tank. The lower layer of sediment containing small fibers and calcium carbonate is reused in the waste paper recycling device 8, while the upper layer of supernatant is discharged through the first pipeline 3.

[0042] In some embodiments, the recycling equipment for the reconstituted tobacco production system further includes a first pump 5 and a first flow meter 4 disposed on the first pipeline 3, and a second pump 6 and a second flow meter 7 disposed on the second pipeline 60.

[0043] The waste paper recycling device 8 is used to recycle and dismantle unqualified substrates or unqualified finished products generated during the reconstituted tobacco production process. It is also suitable for treating small fibers in white water. The dismantled pulp can be reused in proportion to the pulping and pulping processes in the reconstituted tobacco production process to reduce material loss.

[0044] The discharged supernatant can be used in various ways, such as for cleaning equipment, or it can be reused in the washing and thickening processes of reconstituted tobacco production.

[0045] Specifically, in some embodiments, the recycling equipment for the reconstituted tobacco production system further includes a washing tank and / or a thickening tank, which are connected to the first pipeline 3 to transport the supernatant to the washing tank and / or thickening tank.

[0046] Based on the above-mentioned recycling equipment for a reconstituted tobacco production system, the present invention also proposes a reconstituted tobacco production system, which includes the above-mentioned recycling equipment for a reconstituted tobacco production system.

[0047] In the production of reconstituted tobacco, calcium carbonate is often used as a filler or coating. Calcium carbonate can fill the gaps in the reconstituted tobacco substrate, making the substrate surface smoother, improving the substrate's toughness and uniformity, and can also adjust the pH value of the substrate, neutralize acidic substances, and improve the taste of the final reconstituted tobacco product.

[0048] refer to Figure 1 As shown, in some embodiments, the reconstituted tobacco production system further includes a pulping device 24, which is used to prepare a second pulp with a preset calcium carbonate concentration required for the production of reconstituted tobacco. The pulping device 24 is connected to at least one of a white water recovery device, a waste paper recovery device 8, and a calcium carbonate supply device.

[0049] The pulp preparation unit 24 can use one or more of the following: a white water recovery unit, a waste paper recovery unit 8, and a calcium carbonate supply unit to obtain the calcium carbonate supply required in the pulp preparation process. This can not only realize the recycling of white water and waste paper, reducing the load on the wastewater treatment process and reducing material waste in the production process, but also reduce the calcium carbonate loss of the calcium carbonate supply unit, thereby further reducing production costs.

[0050] refer to Figure 1 As shown, in some embodiments, the waste paper recycling device 8 is equipped with a first agitator 9 for crushing and agitating waste paper and small fibers to obtain a first pulp with uniform texture for further use in the pulping process.

[0051] In some embodiments, the waste paper recycling device 8 is connected to the pulp mixing device 24 to deliver the first pulp to the pulp mixing device 24.

[0052] In some embodiments, the calcium carbonate supply device includes a calcium carbonate mixing tank 14 for preparing calcium carbonate solution, and the calcium carbonate mixing tank 14 is connected to the slurry preparation device 24.

[0053] In some embodiments, the calcium carbonate supply device further includes a fourth pipeline 15 and a thirteenth flow meter 16 disposed on the fourth pipeline 15, the fourth pipeline 15 being configured to supply water for preparing calcium carbonate solution to the calcium carbonate mixing tank 14.

[0054] In some embodiments, the calcium carbonate supply device further includes a first feeding hopper 17 connected to the calcium carbonate mixing tank 14, the first feeding hopper 17 being configured to store solid calcium carbonate.

[0055] The calcium carbonate mixing tank 14 is used to prepare a calcium carbonate solution of a certain concentration by mixing solid calcium carbonate with water. In order to improve the solubility of calcium carbonate during the preparation process and to prevent precipitation of the prepared calcium carbonate solution, in some embodiments, a second stirrer 18 is provided inside the calcium carbonate mixing tank 14.

[0056] In other embodiments, the pulping device 24 is provided with a third agitator 23 to agitate the components used for pulping to form a second pulp with a uniform texture, so that the fibers and fillers therein are fully combined for the next production process.

[0057] In some embodiments, the reconstituted tobacco production system further includes a first detection device 33 and a controller. The first detection device 33 is configured to detect the calcium carbonate content of the substrate obtained by the second pulp forming process. The controller is configured to adjust the flow rate between the waste paper recycling device 8 and the pulp mixing device 24 and / or the flow rate between the calcium carbonate mixing tank 14 and the pulp mixing device 24 based on the detection result of the first detection device 33.

[0058] In reconstituted tobacco production, the calcium carbonate content of the substrate affects the performance and taste of the final tobacco product. Therefore, obtaining a substrate with a suitable calcium carbonate content is crucial in the production process. By setting up a first detection device 33 to detect the calcium carbonate content in the substrate obtained after the second pulp is formed, and setting up a controller to adjust the flow rate of the first pulp or calcium carbonate solution, the calcium carbonate content of the second pulp in the pulping device 24 can be adjusted to keep the calcium carbonate content in the substrate stable when the calcium carbonate content in the substrate fluctuates or does not meet production requirements. This ensures the stability of the final tobacco product quality.

[0059] Specifically, in some embodiments, the controller includes a first control unit 58 and a second control unit 59. The first control unit 58 is configured to control the content of calcium carbonate in the substrate detected by the first detection device 33 to adjust the flow rate of the first pulp between the waste paper recycling device 8 and the pulp mixing device 24. The second control unit 59 is configured to control the content of calcium carbonate in the substrate detected by the first detection device 33 to adjust the flow rate of the calcium carbonate solution between the calcium carbonate mixing tank 14 and the pulp mixing device 24.

[0060] In some embodiments, the reconstituted tobacco production system further includes a second detection device 10 for detecting the calcium carbonate concentration of the first pulp, and the controller is configured to adjust the flow rate between the waste paper recycling device 8 and the pulp mixing device 24 and / or the flow rate between the calcium carbonate mixing tank 14 and the pulp mixing device 24 based on the detection result of the second detection device 10.

[0061] Specifically, by obtaining the calcium carbonate concentration of the first slurry, if the calcium carbonate concentration of the first slurry is high, the output flow rate of the calcium carbonate mixing tank 14 can be appropriately reduced, and if the calcium carbonate concentration of the first slurry is low, the output flow rate of the calcium carbonate mixing tank 14 can be appropriately increased.

[0062] In other embodiments, the reconstituted tobacco production system further includes a third pipeline 13, a third pump 19, and a third flow meter 20 connected between the waste paper recycling device 8 and the pulping device 24, and a fourth pipeline, a fourth pump 11, and a fourth flow meter 12 connected between the calcium carbonate mixing tank 14 and the pulping device 24. The first control unit 58 and the second control unit 59 can adjust the flow rate of the calcium carbonate solution in real time based on the detection results of the above-mentioned detection devices and the parameters of these flow meters and pumps.

[0063] For example, when there is a lot of recycled white water and waste paper, the output flow rate of the first pulp is relatively large, so the output flow rate of the calcium carbonate mixing tank 14 can be appropriately reduced. Conversely, when the flow rate of the first pulp is relatively small, the output flow rate of the calcium carbonate mixing tank 14 can be appropriately increased.

[0064] In some embodiments, the reconstituted tobacco production system further includes a papermaking device connected to the pulping unit 24. The papermaking device is configured to perform papermaking forming processing on the second pulp. The papermaking device includes a forming unit 32 and a reinforcing agent mixing unit and / or a retention aid mixing unit. The reinforcing agent mixing unit and / or the retention aid mixing unit are connected to a connecting pipeline between the pulping unit 24 and the forming unit 32. The reinforcing agent mixing unit is configured to mix a reinforcing agent to improve the cohesiveness of the fibers in the second pulp, and the retention aid mixing unit is configured to mix a retention aid to improve the adhesion of the fibers in the second pulp, wherein the viscosity of the reinforcing agent is less than the viscosity of the retention aid.

[0065] By adding a reinforcing agent to the second pulp, the cohesiveness of the fibers in the second pulp can be improved, promoting the aggregation of fibrous materials such as tobacco stems and dust to initially form tobacco sheets and generate a second pulp with a lower concentration. Furthermore, adding a retention aid to the lower-concentration second pulp can improve the adhesion of the remaining small fibers and calcium carbonate. The viscosity of the retention aid is generally set higher than that of the reinforcing agent, thus further enhancing the adhesion of the small fibers and calcium carbonate, allowing them to adhere to the tobacco sheets. This achieves thorough shaping of the materials in the second pulp, reducing the amount of material lost to the white water in subsequent stages, and ultimately increasing the final product yield.

[0066] refer to Figure 1As shown, in some embodiments, the papermaking equipment further includes a first mixing tank 27 and a second mixing tank 30. The first mixing tank 27 is connected to the slurry mixing device 24 and the reinforcing agent mixing device, and the second mixing tank 30 is connected to the first mixing tank 27 and the retention aid mixing device. The second mixing tank 30 is disposed between the first mixing tank 27 and the forming device 32.

[0067] By setting up the first mixing tank 27, space is provided for the second slurry and reinforcing agent to be fully mixed, ensuring that the fibrous materials such as tobacco stems and tobacco dust are fully coagulated and formed.

[0068] In some embodiments, the first mixing tank 27 is provided with a fourth stirrer 41.

[0069] In other embodiments, the reconstituted tobacco production system also includes a seventh pump 44 and a seventh flow meter 45 disposed on the connecting pipeline between the enhancer preparation device and the first mixing tank 27.

[0070] The ratio of reinforcing agent applied in the first mixing tank 27 is one ten-thousandth to five thousandths of the dry weight of the substrate obtained by the second slurry after paper forming.

[0071] By setting up a second mixing tank 30, space is provided for the second pulp with a lower concentration and retention aid to be fully mixed, thereby further retaining substances such as small fibers and calcium carbonate in the second pulp, reducing material waste and enhancing the mechanical properties of tobacco sheets.

[0072] In some embodiments, the second mixing tank 30 is provided with a fifth stirrer 55.

[0073] In other embodiments, the reconstituted tobacco production system also includes an eighth pump 56 and an eighth flow meter 57 disposed on the connecting pipeline of the retention aid preparation device and the second mixing tank 30.

[0074] The retention aid in the second mixing tank 30 is applied at a ratio of 0.02% to 0.4% of the dry weight of the substrate obtained by the second slurry after paper forming.

[0075] In some embodiments, the reinforcing agent and retention aid may be mixed in a certain proportion to form a mixed additive, and then the mixed additive may be applied in the second mixing tank 30.

[0076] In some embodiments, the reconstituted tobacco production system further includes an eleventh flow meter 31 disposed on the connecting pipeline between the second mixing tank 30 and the forming device 32.

[0077] In some embodiments, the reconstituted tobacco production system further includes a fifth pump 25 and a fifth flow meter 26 disposed on the connecting pipeline between the pulping device 24 and the first mixing tank 27, and a sixth pump 28 and a sixth flow meter 29 disposed on the connecting pipeline between the first mixing tank 27 and the second mixing tank 30.

[0078] refer to Figure 1 As shown, in some embodiments, the reinforcing agent preparation device includes a reinforcing agent preparation tank 40, a second feeding bin 36, a first conveying pipe 34, a second conveying pipe 38, and a screw dosing machine 37. Both the first conveying pipe 34 and the second conveying pipe 38 are configured to convey a first fluid into the reinforcing agent preparation tank 40, wherein the temperature of the first fluid conveyed by the second conveying pipe 38 is greater than or equal to the temperature of the first fluid conveyed by the first conveying pipe 34. The second feeding bin 36 is configured to store reinforcing agent powder, and the outlet of the second feeding bin 36 is connected to the first conveying pipe 34. The screw dosing machine 37 is disposed between the outlet of the second feeding bin 36 and the first conveying pipe 34.

[0079] In the above embodiments, the first fluid is usually tap water at room temperature. The water transported in the first conveying pipe 34 is mainly used to impact the reinforcing agent powder at the outlet of the second feeding bin 36 and guide it to the reinforcing agent mixing tank 40. When the ambient temperature is low, the temperature of the water transported in the second conveying pipe 38 can be set higher to improve the solubility of the reinforcing agent powder in water and form a homogeneous reinforcing agent reagent.

[0080] In some embodiments, the reinforcing agent preparation device further includes a twelfth flow meter 35 disposed on the first delivery pipe 34.

[0081] In other embodiments, the enhancer dispensing device further includes a ninth flow meter 39 disposed on the second delivery pipe 38.

[0082] In other embodiments, the reinforcing agent preparation device further includes a first liquid level sensor 42 and a first temperature sensor 43, wherein the first liquid level sensor 42 is used to detect the content of reinforcing agent reagent in the reinforcing agent preparation tank 40, and the first temperature sensor 43 is used to detect the temperature of reinforcing agent reagent in the reinforcing agent preparation tank 40.

[0083] refer to Figure 1 As shown, in some embodiments, the retention aid preparation device includes a retention aid preparation tank 51, a third feeding bin 47, a third conveying pipe 46, and a mixing pipe 48. The third feeding bin 47 is configured to store retention aid powder. The third conveying pipe 46 is connected to the retention aid preparation tank 51 and is configured to convey high-pressure fluid. The mixing pipe 48 is disposed on the pipeline of the third conveying pipe 46, and the outlet of the third feeding bin 47 is connected to the mixing pipe 48. (Refer to...) Figure 2As shown, the mixing pipe 48 includes a variable diameter section where the flow area decreases along the flow direction of the fluid. When the high-pressure fluid flows through the variable diameter section, a negative pressure is generated to draw the retention aid powder into the third delivery pipe 46.

[0084] Since retention aids typically have high viscosity, clumping and agglomeration can easily occur during the preparation of retention aid powder with water. By setting up a mixing pipe 48, the retention aid powder can be drawn into the third conveying pipe 46, allowing high-pressure fluid (which can be high-pressure tap water) to impact the retention aid powder, thereby improving the dispersion of the retention aid powder in water and reducing the occurrence of agglomeration.

[0085] In some embodiments, the retention aid preparation apparatus further includes a fourth delivery pipe 49 communicating with the retention aid preparation tank 51, the fourth delivery pipe 49 being configured to deliver a second fluid into the retention aid preparation tank 51, the temperature of the second fluid being greater than the temperature of the high-pressure fluid.

[0086] In the above embodiments, the high-pressure fluid can be tap water at room temperature, and the second fluid can be tap water at 40°C to 70°C. The higher temperature can cause the retention aid powder to undergo a gelatinization reaction, further increasing the viscosity of the prepared retention aid reagent, and also helping to improve the solubility of the retention aid powder in water, thereby forming a homogeneous retention aid reagent.

[0087] In some embodiments, the retention aid preparation device further includes a tenth flow meter 50 disposed on the fourth delivery pipe 49.

[0088] In other embodiments, the retention aid preparation device further includes a second liquid level sensor 52 and a second temperature sensor 53. The second liquid level sensor 52 is used to detect the content of the reinforcing agent in the retention aid preparation tank 51, and the second temperature sensor 53 is used to detect the temperature of the retention aid in the retention aid preparation tank 51.

[0089] In addition, the viscosity and other properties of retention aid reagents are easily affected by temperature. In some embodiments, in order to ensure the stability of the performance of retention aid reagents, the retention aid preparation device also includes a heat insulation layer 54 disposed on the outer periphery of the retention aid preparation tank 51.

[0090] Specifically, in some embodiments, the reinforcing agent is nonionic modified guar gum, or it may be other substances that have similar functions to nonionic modified guar gum.

[0091] In some embodiments, the retention aid is at least one of cationic modified guar gum, carboxymethyl cellulose, chitosan and yellow gelatin, or other substances with similar functions.

[0092] In some embodiments, the reconstituted tobacco production system further includes a tobacco pulp supply device, a first supply line 21, an external fiber supply device, and a second supply line 22, wherein the first supply line 21 is connected to the tobacco pulp supply device and the pulp mixing device 24, and the second supply line 22 is connected to the external fiber supply device and the pulp mixing device 24.

[0093] The main raw material of the tobacco pulp supplied by the tobacco pulp supply device is the fiber in tobacco stems and tobacco dust. The cellulose content is low and it is not suitable for direct use in the production of tobacco sheets. Therefore, by adding external fiber through the external fiber supply device, it can play a filling and retention role. The external fiber can be a combination of long fiber and short fiber from hemp pulp. The long fiber increases the strength of the tobacco sheet, and the short fiber forms a local grid of the tobacco sheet, which helps to obtain a tobacco sheet product with uniform texture and appropriate strength.

[0094] The following describes specific embodiments of the recycling equipment and the reconstituted tobacco production system of the present invention:

[0095] refer to Figure 1 As shown, the recycling equipment of the present invention for the reconstituted tobacco production system mainly includes a pulp washing tank, a thickening tank, a white water recycling device, a waste paper recycling device 8, and a calcium carbonate supply device. The white water recycling device includes a sedimentation tank 1, which is connected to the pulp washing tank or the thickening tank through a first pipeline 3 and to the waste paper recycling device 8 through a second pipeline 60. The calcium carbonate supply device includes a calcium carbonate mixing tank 14.

[0096] The reconstituted tobacco production system of the present invention mainly includes the above-mentioned recycling equipment for the reconstituted tobacco production system, as well as a tobacco pulp supply device, an external fiber supply device, a pulp mixing device 24, a reinforcing agent mixing device, a retention aid mixing device, and a papermaking device. The waste paper recycling device 8 and the calcium carbonate mixing tank 14 are both connected to the pulp mixing device 24. The papermaking device includes a first mixing tank 27, a second mixing tank 30, and a forming device 32. The reinforcing agent mixing device and the retention aid mixing device are connected to the connecting pipeline between the pulp mixing device 24 and the forming device 32. The first mixing tank 27 is connected to the pulp mixing device 24 and the reinforcing agent mixing device, and the second mixing tank 30 is connected to the first mixing tank 27 and the retention aid mixing device. The second mixing tank 30 is located between the first mixing tank 27 and the forming device 32.

[0097] The reconstituted tobacco production system provided by the present invention includes at least the following steps:

[0098] A tobacco pulp supply device is used to pulp tobacco stems and tobacco dust, and an external fiber supply device is used to pulp external fibers (such as coniferous wood and hemp grass), and the two pulps are fed into the pulping device 24.

[0099] Waste paper recycling device 8 is used to recycle waste paper generated in processes such as papermaking and forming;

[0100] The white water is recycled by a white water recycling device, which is used to recycle the white water generated in the pulp washing and paper forming processes. The white water is then settled in a sedimentation tank 1 and the supernatant obtained from the sedimentation is transported to a pulp washing tank or a thickening tank. The precipitate obtained from the sedimentation is then transported to a waste paper recycling device 8.

[0101] The waste paper and precipitate are separated by the waste paper recycling device 8 to form the first pulp, and the first pulp is fed into the pulp mixing device 24;

[0102] The calcium carbonate solution is prepared using the calcium carbonate mixing tank 14 and then fed into the slurry mixing device 24.

[0103] The above-mentioned liquids are stirred and mixed in the slurry preparation device 24 to form a second slurry;

[0104] The reinforcing agent reagent was prepared using a reinforcing agent preparation device, and the retention aid reagent was prepared using a retention aid preparation device.

[0105] The second slurry is sequentially transported to the molding device 32 through the first mixing tank 27 and the second mixing tank 30. A certain proportion of reinforcing agent is applied to the first mixing tank 27 through the reinforcing agent mixing device, and a certain proportion of retention aid is applied to the second mixing tank 30 through the retention aid mixing device. The application ratio of the reinforcing agent is 1 / 10,000 to 5 / 1,000 of the dry weight of the substrate obtained by the second slurry after paper forming and molding, and the application ratio of the retention aid is 2 / 10,000 to 4 / 1,000 of the dry weight of the substrate obtained by the second slurry after paper forming and molding.

[0106] The slurry from the second mixing tank 30 is formed using a forming device 32.

[0107] The calcium carbonate content in the substrate obtained in the above-mentioned paper forming process is tested, and the output flow rate of the waste paper recycling device 8 and / or calcium carbonate mixing tank 14 is adjusted based on the test results so that the calcium carbonate content in the substrate is maintained within the range that meets the production requirements.

[0108] The waste paper generated during the above paper forming process is conveyed to the waste paper recycling device 8;

[0109] The white water generated during the above-mentioned copying and molding process is transported to the white water recycling device.

[0110] Through the description of the recycling equipment and multiple embodiments of the reconstituted tobacco production system of the present invention, it can be seen that the present invention can recycle and decompose unqualified substrates or unqualified finished products generated during the reconstituted tobacco production process, as well as collect and treat white water, and further reuse these treated products in processes such as pulping, washing, and thickening. This can not only significantly reduce the loss of raw materials in the reconstituted tobacco production process and improve the product yield (input-output ratio) of reconstituted tobacco, but also alleviate the pressure on the wastewater and waste treatment process and reduce production costs. Furthermore, by detecting the calcium carbonate content in the substrates obtained from paper forming and adjusting the amount of recycled products in real time based on the detection results, the present invention can keep the calcium carbonate content in the substrates stable, thereby ensuring the stability of the final tobacco product quality.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can still be made to some technical features without departing from the principle of the present invention, and such modifications and equivalent substitutions should all be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A reconstituted tobacco leaf production system characterized by, The system comprises a recovery device comprising: a white water recovery device configured to collect and treat white water generated in the production of reconstituted tobacco; a broke recovery device (8) configured to defibrate broke generated in the production of reconstituted tobacco and obtain a first slurry; and a calcium carbonate supply device configured to provide a calcium carbonate solution required in the production of reconstituted tobacco, comprising a calcium carbonate preparation tank (14) for preparing the calcium carbonate solution; wherein at least one of the white water recovery device, the broke recovery device and the calcium carbonate supply device is used to prepare a second slurry having a preset calcium carbonate concentration required in the production of reconstituted tobacco; and wherein the system further comprises a slurry preparation device (24) for preparing a second slurry having a preset calcium carbonate concentration required in the production of reconstituted tobacco, a controller, a first detection device (33) configured to detect the calcium carbonate content of a base sheet obtained by a sheet-forming process of the second slurry, and a second detection device (10) configured to detect the calcium carbonate concentration of the first slurry, the controller being configured to adjust the flow rate of a communication pipeline between the broke recovery device (8) and the slurry preparation device (24) and the flow rate of a communication pipeline between the calcium carbonate preparation tank (14) and the slurry preparation device (24) based on the detection results of the first detection device (33) and the second detection device (10).

2. The system according to claim 1, wherein the white water recovery device is in communication with the broke recovery device (8) to deliver small fibers contained in the white water to the broke recovery device (8).

3. The reconstituted tobacco leaf production system of claim 1, wherein, The white water recovery device comprises a sedimentation tank (1) configured to sediment the white water to obtain supernatant and sediment, a first pipeline (3) for outputting the supernatant, and a second pipeline (60) in communication with the sedimentation tank (1) and the broke recovery device (8) to deliver the sediment to the broke recovery device (8).

4. The reconstituted tobacco leaf production system of claim 3, wherein, A washing tank and / or a concentration tank are further included, which are in communication with the first pipeline (3).

5. The reconstituted tobacco leaf production system of claim 1, wherein, The interior of at least one of the broke recovery device (8), the calcium carbonate preparation tank (14) and the slurry preparation device (24) is provided with a stirrer.

6. The reconstituted tobacco leaf production system of claim 1, wherein, The papermaking device further comprises a first mixing tank (27) and a second mixing tank (30), the first mixing tank (27) being in communication with the pulp preparation device (24) and the reinforcing agent preparation device, the second mixing tank (30) being in communication with the retention agent preparation device, and the second mixing tank (30) being arranged between the first mixing tank (27) and the forming device (32).

7. The reconstituted tobacco leaf production system of claim 6, wherein, The reinforcing agent preparation device comprises a reinforcing agent preparation tank (40), a second feeding bin (36), a first conveying pipe (34), a second conveying pipe (38), and a screw feeder (37), the first conveying pipe (34) and the second conveying pipe (38) are both configured to convey a first fluid into the reinforcing agent preparation tank (40), wherein the temperature of the first fluid conveyed by the second conveying pipe (38) is greater than or equal to the temperature of the first fluid conveyed by the first conveying pipe (34), the second feeding bin (36) is configured to store reinforcing agent powder, the outlet of the second feeding bin (36) is in communication with the first conveying pipe (34), and the screw feeder (37) is arranged between the outlet of the second feeding bin (36) and the first conveying pipe (34).

8. The reconstituted tobacco leaf production system of claim 6, wherein, The retention agent preparation device comprises a retention agent preparation tank (51), a third feeding bin (47), a third conveying pipe (46), and a mixing pipe (48), the third feeding bin (47) is configured to store retention agent powder, the third conveying pipe (46) is in communication with the retention agent preparation tank (51), the third conveying pipe (46) is configured to convey a high-pressure fluid, the mixing pipe (48) is arranged on the pipeline of the third conveying pipe (46), and the outlet of the third feeding bin (47) is in communication with the mixing pipe (48), the mixing pipe (48) comprises a variable-diameter portion with a flow area decreasing in the flow direction of the fluid, and the high-pressure fluid generates negative pressure when flowing through the variable-diameter portion to suck the retention agent powder into the third conveying pipe (46).

9. The reconstituted tobacco leaf production system of claim 6, wherein, The retention agent preparation device further comprises a fourth conveying pipe (49) in communication with the retention agent preparation tank (51), the fourth conveying pipe (49) is configured to convey a second fluid into the retention agent preparation tank (51), and the temperature of the second fluid is greater than the temperature of the high-pressure fluid.

10. The reconstituted tobacco leaf production system of claim 9, wherein, The reinforcing agent comprises a non-ionic modified guar gum.

11. The reconstituted tobacco leaf production system of claim 6, wherein, ​ 12. The reconstituted tobacco leaf production system of claim 6, wherein, The retention aid includes at least one of cationic modified guar gum, carboxymethyl cellulose, chitosan, and gelatin. The retention aid includes at least one of cationic modified guar gum, carboxymethyl cellulose, chitosan, and gelatin.

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