Spiral mixing bleaching device

Abstract

The utility model discloses a spiral mixing and bleaching device which comprises a conveying shell, a spiral mixing and bleaching device, a spiral mixing and bleaching device, a spiral mixing and bleaching device and a spiral mixing and bleaching device, and is characterized in that the conveying shell is provided with a feed port and a discharge port; the conveying and mixing screw comprises a conveying shaft, a spiral blade and a spiral groove are arranged on the conveying shaft, a liquid conveying channel is arranged on the inner side of the conveying shaft, a liquid conveying opening communicated with the liquid conveying channel is formed in the end of the conveying shaft, and an inner liquid adding opening communicated with the liquid conveying channel is formed in the conveying shaft. Liquid medicine is added from the outer liquid adding opening in the conveying shell, namely from the radial outer side of materials, and is added from the inner liquid adding opening in the conveying shaft, namely from the radial inner side of the materials to be in contact with and mixed with the materials, and the materials are conveyed to the discharging opening in the spiral groove, stirred and further mixed with the liquid medicine for bleaching. The liquid medicine is added to the radial outer side and the radial inner side of the material, the contact mixing points of the material and the liquid medicine are increased, and the mixing blind area is reduced, so that the mixing uniformity of the material and the liquid medicine can be improved, and the adding amount of the liquid medicine is reduced.

Description

Technical Field

[0001] This utility model relates to the field of papermaking fiber production technology, and in particular to a spiral mixing bleaching device. Background Technology

[0002] In the papermaking pulping process, plant fibers such as wood fiber, bamboo fiber, and reed fiber require a bleaching process, specifically by adding bleaching agents such as hydrogen peroxide and sodium hydroxide. The bleaching effect of the fibers affects the whiteness and color uniformity of the paper. Existing technologies employ a spiral mixing structure for bleaching, where the fibers are added to the outer shell while bleaching agents are added from the outer shell inwards. The fibers and bleaching agents are then pushed and mixed by a spiral within the shell, achieving bleaching. However, this bleaching method only adds the bleaching agent from the outer shell inwards, resulting in uneven mixing of the fibers and the agent. This leads to inconsistent whiteness in the processed fibers. To increase the uniformity of whiteness, more bleaching agent needs to be added, resulting in high costs for both the bleaching agent and the processing. Utility Model Content

[0003] The main purpose of this invention is to propose a spiral mixing bleaching device, which aims to solve the technical problems of insufficient uniform mixing and large amount of added medicine in the existing technology.

[0004] To achieve the above objectives, this utility model proposes a spiral mixing bleaching device, comprising:

[0005] The conveying housing is provided with an inlet and an outlet, and an external liquid inlet is provided for adding liquid medicine to the inside of the conveying housing;

[0006] A conveying and mixing screw includes a conveying shaft rotatably connected to a conveying housing. The conveying shaft is provided with helical blades and helical grooves, which are located inside the conveying housing. The helical blades and helical grooves can convey materials from the feed inlet to the discharge outlet. The inner side of the conveying shaft is provided with a liquid delivery channel, and the end of the conveying shaft is provided with a liquid delivery port communicating with the liquid delivery channel. The conveying shaft is provided with an internal liquid inlet communicating with the liquid delivery channel, which is used to add liquid medicine into the helical grooves.

[0007] Material is added into the inner side of the conveyor housing through the feed inlet. As the conveying and mixing screw rotates, the bleaching solution is added from both the outer and inner sides of the material through the external inlet on the conveyor housing and the inner inlet on the conveyor shaft. The material is then conveyed and stirred within the spiral grooves towards the discharge outlet, where it is further mixed with the bleaching solution for bleaching. By using this spiral mixing bleaching device, bleaching solution is added to both the outer and inner sides of the material, increasing the contact points between the material and the bleaching solution, reducing blind spots in the mixing process, thereby improving the uniformity of the mixture and reducing the amount of bleaching solution needed.

[0008] Preferably, the spiral blades are provided with a feeding section, a dispersing and dosing section and a mixing section in the axial direction of the conveying shaft. The feeding section, the dispersing and dosing section and the mixing section are arranged sequentially in the direction from the feed inlet to the discharge outlet. The feed inlet is directly opposite the feeding section, and the inner liquid inlet and the outer liquid inlet are both directly opposite the dispersing and dosing section.

[0009] The material enters the feeding section through the inlet and is then conveyed to the dispersing and dosing section. The lumpy material is dispersed in the dispersing and dosing section, which increases the contact area with the liquid medicine. The liquid medicine is added in the dispersing and dosing section and comes into contact with and mixes with the dispersed material, making the mixture of liquid medicine and material more uniform. Then the material is conveyed to the mixing section, where the material and liquid medicine are further stirred and mixed to ensure that the material and liquid medicine react fully for bleaching.

[0010] Preferably, the spiral blade located in the dispersing and dosing section includes a plurality of dispersing teeth, which are arranged at intervals along the extension direction of the spiral blade, and a dispersing and material passing gap is provided between two adjacent dispersing teeth.

[0011] Because the material is compressed into clumps by the pretreatment process before bleaching, most of the material will be in clumps when it enters the feed inlet. This solution uses multiple dispersing teeth to break up the material, resulting in more even mixing with the chemical solution and ensuring that the material inside the clumps comes into contact with the chemical solution.

[0012] Preferably, the dispersing teeth include a first plate and a second plate connected together. Both the first plate and the second plate are connected to the conveying shaft and extend radially along the conveying shaft. The first plate and the second plate are set at an obtuse angle. The connection angle between the first plate and the second plate protrudes toward the conveying direction of the spiral blade. Both the first plate and the second plate are set at an angle to the tangent direction of the spiral blade at the connection angle between the first plate and the second plate.

[0013] When the conveying screw rotates, the corner between the first and second plates impacts and breaks up clumps of material. The conical corner makes it easier to disperse the material. After dispersion, some material is pushed forward by the dispersing teeth, while others pass through the gap between the first and second plates to prevent material from remaining on the teeth. Furthermore, the first and second plates are set at an obtuse angle, and both are angled to the tangent of the screw blades. This design effectively disperses the material while pushing most of it forward, maintaining high material conveying efficiency.

[0014] Preferably, the external liquid inlet and / or the internal liquid inlet are equipped with atomizing nozzles, which can atomize the liquid medicine and spray it out. The liquid medicine is sprayed out through the atomizing nozzles, so that the liquid medicine is sprayed onto the material in a mist form, so that the liquid medicine and the material have a larger contact area and more uniform mixing.

[0015] Preferably, the spiral mixing bleaching device further includes a drive motor, which is fixed relative to the conveying housing and is connected to the conveying shaft for transmission.

[0016] Preferably, the infusion port is connected to a rotary joint.

[0017] Preferably, there are multiple external liquid inlets, which are evenly distributed along the circumference of the conveying housing.

[0018] Preferably, there are multiple internal liquid inlets, which are evenly distributed circumferentially along the conveying shaft.

[0019] Preferably, there are multiple internal liquid inlets, which are arranged along the extension direction of the spiral blade and located on the side of the spiral blade. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional view of the spiral mixing bleaching device of this utility model;

[0022] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0023] Figure 3This is a partial structural diagram of the dispersing and dosing section of this utility model.

[0024] In the attached diagram: 1-Conveying shell, 11-Inlet, 12-Outlet, 13-External liquid inlet, 21-Conveying shaft, 22-Spiral blade, 221-Inlet section, 222-Dispersing and dosing section, 223-Mixing section, 23-Spiral groove, 24-Infusion channel, 241-Infusion port, 242-Internal liquid inlet, 25-Dispersing teeth, 251-First plate, 252-Second plate, 26-Dispersing material passage gap, 3-Drive motor.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators, such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] like Figures 1 to 3 As shown, a spiral mixing bleaching device includes a conveying housing 1 and a conveying mixing screw.

[0030] The conveying shell 1 is basically cylindrical and arranged horizontally. The conveying shell 1 is provided with an inlet 11 and an outlet 12. The material is added into the conveying shell 1 through the inlet 11, and the bleached material is discharged through the outlet 12. The conveying shell 1 is provided with an external liquid inlet 13, which is used to add liquid medicine to the inside of the conveying shell 1.

[0031] The conveying and mixing screw includes a transversely arranged conveying shaft 21, which is rotatably connected to the conveying housing 1. The conveying shaft 21 is provided with helical blades 22 and helical grooves 23, located inside the conveying housing 1. The helical grooves 23 are the slot spaces formed between two adjacent protrusions in the helical blades 22. The helical blades 22 and helical grooves 23 can convey materials from the inlet 11 to the outlet 12. A liquid delivery channel 24 is provided inside the conveying shaft 21, and a liquid delivery port 241 communicating with the liquid delivery channel 24 is provided at the end of the conveying shaft 21. An internal liquid inlet 242 communicating with the liquid delivery channel 24 is provided on the conveying shaft 21 for adding liquid medicine into the helical grooves 23. The spiral mixing bleaching device also includes a drive motor 3, which is fixed relative to the conveying housing 1 and is drively connected to the conveying shaft 21. The drive motor 3 can drive the conveying and mixing screw to rotate.

[0032] Material is added into the inner side of the conveying housing 1 through the feed port 11. The conveying and mixing screw rotates, and simultaneously, the bleaching solution is added from the outer liquid inlet 13 (radially from the outer side of the material) and the inner liquid inlet 242 (radially from the inner side of the material) on the conveying shaft 21, contacting and mixing with the material. The material is conveyed and stirred within the spiral groove 23 towards the discharge port 12, where it is further mixed and bleached with the bleaching solution. By using this spiral mixing bleaching device, bleaching solution is added to both the radially outer and radially inner sides of the material, increasing the contact and mixing points between the material and the bleaching solution, reducing mixing blind zones, thereby improving the uniformity of the mixing between the material and the bleaching solution and reducing the amount of bleaching solution added.

[0033] In some specific embodiments, the spiral blade 22 is provided with a feeding section 221, a dispersing and dosing section 222 and a mixing section 223 in the axial direction of the conveying shaft 21. The feeding section 221, the dispersing and dosing section 222 and the mixing section 223 are arranged sequentially in the direction from the feed inlet 11 to the discharge outlet 12. The feed inlet 11 is directly opposite the feeding section 221, and the inner liquid inlet 242 and the outer liquid inlet 13 are both directly opposite the dispersing and dosing section 222.

[0034] The material enters the feeding section 221 through the feed inlet 11 and is then conveyed to the dispersing and dosing section 222. The lumpy material is dispersed in the dispersing and dosing section 222, which increases the contact area with the liquid medicine. The liquid medicine is added in the dispersing and dosing section 222 and comes into contact with and mixes with the dispersed material, making the mixture of liquid medicine and material more uniform. Then the material is conveyed to the mixing section 223, where the material and liquid medicine are further stirred and mixed to ensure that the material and liquid medicine react fully for bleaching.

[0035] In some specific embodiments, reference is made to Figure 3 The spiral blade 22 located in the dispersing and dosing section 222 includes multiple dispersing teeth 25, which are arranged at intervals along the extension direction of the spiral blade 22, and a dispersing and material passing gap 26 is provided between two adjacent dispersing teeth 25.

[0036] Because the material is compressed into clumps by the pretreatment process before bleaching, most of the material will be in clumps when it enters the feed inlet 11. This solution can break up the material by setting multiple dispersing teeth 25, so that the material can be mixed more evenly with the chemical solution after being dispersed, and the material inside the clumps can also come into contact with the chemical solution.

[0037] Further, the dispersing tooth 25 includes a first plate 251 and a second plate 252 connected together. Both the first plate 251 and the second plate 252 are connected to the conveying shaft 21 and extend radially along the conveying shaft 21. The first plate 251 and the second plate 252 are set at an obtuse angle. The connection angle between the first plate 251 and the second plate 252 protrudes towards the conveying direction of the spiral blade 22. The first plate 251 and the second plate 252 are both set at an angle to the tangent direction of the spiral blade 22 at the connection angle between the first plate 251 and the second plate 252. Preferably, the angle between the first plate 251 and the second plate 252 is 110°, and the width of the dispersing gap 26 is 30% of the width of the dispersing tooth 25.

[0038] When the conveying screw rotates, the corner between the first plate 251 and the second plate 252 impacts and breaks up clumps of material. The conical corner makes it easier to disperse the material. After dispersion, some material is pushed forward by the dispersing teeth 25, while the rest passes through the dispersing gap 26 along the first and second plates 251 and 252, preventing material from remaining on the dispersing teeth 25. Furthermore, the first and second plates 251 and 252 are set at an obtuse angle, and both are angled to the tangent of the spiral blade 22. This design effectively disperses the material while pushing most of it forward, maintaining high material conveying efficiency. In other embodiments, the dispersing teeth 25 can also be rectangular or circular columns.

[0039] In some specific embodiments, the external liquid inlet 13 and / or the internal liquid inlet 242 are equipped with atomizing nozzles, which can atomize the liquid medicine and spray it out. The liquid medicine is sprayed out through the atomizing nozzles, so that the liquid medicine is sprayed onto the material in a mist form, so that the liquid medicine and the material have a larger contact area and more uniform mixing.

[0040] In some specific embodiments, the infusion port 241 is connected to a rotary joint. The rotary joint is connected to a pipeline, from which the liquid medicine is transported through the rotary joint and the infusion port 241 into the infusion channel 24. The rotary joint allows for relative rotation between the pipeline and the mixing screw while the liquid medicine is being transported, preventing the mixing screw from driving the pipeline to rotate.

[0041] In some specific embodiments, there are multiple external liquid inlets 13, which are evenly distributed around the circumference of the conveying housing 1. Adding liquid through multiple external liquid inlets 13 at different circumferential positions increases the contact points between the liquid and the fibers, improving the uniformity of the mixing. The number of external liquid inlets 13 can be three, four, or more.

[0042] In some specific embodiments, there are multiple internal liquid inlets 242, which are evenly distributed circumferentially along the conveying shaft 21. Adding liquid through multiple internal liquid inlets 242 at different circumferential positions increases the contact points between the liquid and the fiber, improving the uniformity of the mixing. The number of internal liquid inlets 242 can be three, four, or more.

[0043] In other embodiments, multiple internal liquid inlets 242 are arranged along the extension direction of the spiral blades, and the internal liquid inlets 242 are located beside the spiral blades. After the material is dispersed by the dispersing and dosing section 222, it can immediately come into contact with the liquid medicine, improving the uniformity of mixing.

[0044] The following comparative experiments were conducted on spiral mixing bleaching devices with different structures to compare the required weight of bleaching solution to achieve the same whiteness and uniformity while bleaching the same weight of fiber. In the following experiments, the same fiber was bleached using bleaching solutions of the same composition and concentration. The solutions consisted of 13.5% hydrogen peroxide, 13% sodium hydroxide solution, and a stabilizer. The stabilizer was a commercially available stabilizer known to those skilled in the art for use in fiber bleaching, primarily composed of chelating agents and sodium silicate. The amounts of sodium hydroxide solution and stabilizer were relatively fixed, with approximately 461.5 kg / ton of fiber for sodium hydroxide solution and approximately 34.2 kg / ton of fiber for stabilizer. The bleaching effect was varied by changing the amount of hydrogen peroxide.

[0045] Comparative Example 1:

[0046] The spiral mixing bleaching device includes a conveying housing 1 and a conveying and mixing screw. The conveying housing 1 is provided with an inlet 11, an outlet 12, and an external liquid inlet 13. The external liquid inlet 13 is provided with an atomizing nozzle. The conveying and mixing screw includes a conveying shaft 21, which is provided with spiral blades 22 and spiral grooves 23. The conveying shaft 21 is not provided with an internal liquid inlet 242. The spiral blades 22 are provided with a feeding section 221, a dispersing and dosing section 222, and a mixing section 223. The dispersing and dosing section 222 includes multiple dispersing teeth 25, including a first plate 251 and a second plate 252.

[0047] Example 1:

[0048] The structure of Example 1 is basically the same as that of Comparative Example 1, except that an internal liquid inlet 242 is provided on the conveying shaft 21.

[0049] The comparison results between Comparative Example 1 and Example 1 are shown in the table below:

[0050]

[0051] As shown in the table above, the amount of hydrogen peroxide saved in Example 1 compared to Comparative Example 1 is about 2.4%. It can be seen that by increasing the amount of liquid sprayed on the inside, the amount of liquid used can be saved and the bleaching cost can be reduced. Based on an annual fiber processing capacity of 300,000 tons, the market price of 13.5% concentration hydrogen peroxide is about 286.9 yuan / ton, which can save 636,900 yuan in bleaching liquid costs.

[0052] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A spiral mixing and bleaching apparatus, characterized in that, include: The conveying housing (1) is provided with an inlet (11) and an outlet (12), and an external liquid inlet (13) is provided on the conveying housing (1) for adding liquid medicine to the inside of the conveying housing (1); A conveying mixing screw includes a conveying shaft (21), which is rotatably connected to the conveying housing (1). The conveying shaft (21) is provided with a spiral blade (22) and a spiral groove (23). The spiral blade (22) and the spiral groove (23) are located on the inner side of the conveying housing (1). The spiral blade (22) and the spiral groove (23) can convey the material from the feed inlet (11) to the discharge outlet (12). The inner side of the conveying shaft (21) is provided with a liquid infusion channel (24). The end of the conveying shaft (21) is provided with a liquid infusion port (241) communicating with the liquid infusion channel (24). The conveying shaft (21) is provided with an internal liquid infusion port (242) communicating with the liquid infusion channel (24). The internal liquid infusion port (242) is used to add liquid medicine into the spiral groove (23).

2. The spiral mixing bleaching apparatus as claimed in claim 1, wherein The spiral blade (22) is provided with a feeding section (221), a dispersing and dosing section (222) and a mixing section (223) in the axial direction of the conveying shaft (21). The feeding section (221), the dispersing and dosing section (222) and the mixing section (223) are arranged sequentially in the direction from the feed inlet (11) to the discharge outlet (12). The feed inlet (11) is directly opposite the feeding section (221). The internal liquid inlet (242) and the external liquid inlet (13) are both directly opposite the dispersing and dosing section (222).

3. The spiral mixing bleaching apparatus of claim 2, wherein The spiral blade (22) located in the dispersing and dosing section (222) includes a plurality of dispersing teeth (25), which are arranged at intervals along the extension direction of the spiral blade (22), and a dispersing and material passing gap (26) is provided between two adjacent dispersing teeth (25).

4. The spiral mixing bleaching apparatus of claim 3, wherein The dispersing tooth (25) includes a first plate (251) and a second plate (252) connected together. The first plate (251) and the second plate (252) are both connected to the conveying shaft (21) and extend radially along the conveying shaft (21). The first plate (251) and the second plate (252) are set at an obtuse angle. The connection corner of the first plate (251) and the second plate (252) protrudes toward the conveying direction of the spiral blade (22). The first plate (251) and the second plate (252) are both set at an angle to the tangent direction of the spiral blade (22) at the connection corner of the first plate (251) and the second plate (252).

5. The spiral mixing bleaching apparatus of claim 1 wherein, The external liquid inlet (13) and / or the internal liquid inlet (242) are provided with atomizing nozzles, which can atomize the liquid medicine and spray it out.

6. The spiral mixing bleaching apparatus of claim 1 wherein, The spiral mixing bleaching device also includes a drive motor (3), which is fixed relative to the conveying housing (1) and is connected to the conveying shaft (21) in a transmission connection.

7. The spiral mixing and bleaching apparatus of claim 1 wherein, The infusion port (241) is connected to a rotary joint.

8. The spiral mixing bleaching apparatus of claim 1 wherein, The number of external liquid inlets (13) is multiple, and the multiple external liquid inlets (13) are evenly distributed around the circumference of the conveying shell (1).

9. The spiral mixing bleaching apparatus of claim 1 wherein, The number of internal liquid inlets (242) is multiple, and the multiple internal liquid inlets (242) are evenly distributed circumferentially along the conveying shaft (21).

10. The spiral mixing bleaching apparatus of claim 1 wherein, The number of internal liquid inlets (242) is multiple, and the multiple internal liquid inlets (242) are arranged along the extension direction of the spiral blade (22), and the internal liquid inlets (242) are located on the side of the spiral blade (22).

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