Preimpregnation tower

Abstract

The preimpregnation tower comprises a tower body, a liquid supply assembly is arranged in the tower body, the liquid supply assembly comprises a center pipe and branch pipes, the center pipe is located in the center of the tower body, the length direction of the center pipe is parallel to the axis direction of the tower body, and a first nozzle is formed in an outlet of the center pipe; at least two branch pipes are arranged in the circumferential direction of the central pipe, inlets of the branch pipes are communicated with the central pipe, outlets of the branch pipes are located between the inner wall of the tower body and the central pipe, and a second nozzle is formed between the inner wall of the tower body and the central pipe. Black liquor sprayed through the central pipe forms flash steam near the central pipe to steam wood chips, located near the central pipe, of the wood chip stock column, black liquor sprayed through the branch pipes forms flash steam between the central pipe and the inner wall of the tower body to steam wood chips around the wood chip stock column, and the flash steam and the flash steam are matched to steam the wood chips around the wood chip stock column. It is guaranteed that the center and the periphery of the wood chip stock column are effectively steamed, and the wood chip steaming uniformity of the wood chip stock column is improved.

Description

Technical Field

[0001] The present application relates to the technical field of cooking pulping, and in particular to a prepreg tower. Background Art

[0002] The prepreg tower is a cooking equipment in the pulp and paper production line. It has three functional areas: wood chip buffer area, steaming area and impregnation area, taking into account the functions of pre-steaming and pre-impregnation.

[0003] In related technologies, such as Figure 1 As shown, the high-temperature black liquor is fed into the steaming zone of the prepreg tower only through a central tube 01. Since the prepreg tower is a normal pressure container, the high-temperature black liquor generates a large amount of flash steam in the steaming zone. The high-temperature flash steam steams the wood chip column 02 in the wood chip buffer zone to remove the air in the wood chips so that the wood chips can enter the impregnation zone to obtain a better impregnation effect. However, how to make the wood chips entering the prepreg tower obtain a more uniform steam effect is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] The present application proposes a prepreg tower to improve the steaming uniformity of a wood chip column in a cross section.

[0005] In order to achieve the above-mentioned object, the present application provides a prepreg tower, comprising a tower body, wherein a liquid supply assembly is arranged in the tower body for supplying black liquor to the steaming zone of the tower body,

[0006] The liquid supply assembly comprises:

[0007] A central tube, located at the center of the tower body and parallel to the axis of the tower body, the outlet of the central tube forming a first nozzle;

[0008] The central tube has at least two branch tubes in the circumferential direction, the inlet of each branch tube is connected with the central tube, and the outlet of each branch tube is located between the inner wall of the tower body and the central tube, so as to form a second nozzle between the inner wall of the tower body and the first nozzle.

[0009] Preferably, the above-mentioned prepreg tower further comprises a liquid separation pipe, through which the branch pipes are connected with the central pipe, and at least two branch pipes are arranged on each of the liquid separation pipes.

[0010] Preferably, in the above-mentioned prepreg tower, the liquid distribution pipe is located outside the tower body, and at least two of the liquid distribution pipes are connected to the portion of the central pipe located outside the tower body through a connecting pipe.

[0011] The branch pipe passes through the top of the tower body and is communicated with the liquid separation pipe.

[0012] Preferably, in the above-mentioned prepreg tower, the branch pipes are evenly distributed along the circumference of the central pipe.

[0013] Preferably, in the above-mentioned prepreg tower, the diameter of the central tube is greater than or equal to the diameter of the branch tube.

[0014] Preferably, in the above-mentioned prepreg tower, the outlet of the branch pipe is provided with a diverter plate.

[0015] Preferably, in the above-mentioned prepreg tower, a spray hole is provided at a position of the central tube close to an outlet of the central tube.

[0016] Preferably, in the above-mentioned prepreg tower, the central tube and the branch tubes are stainless steel tubes.

[0017] The prepreg tower provided in the embodiment of the present application includes a tower body, and a liquid supply assembly is arranged in the tower body, which is used to supply black liquor to the steaming area of ​​the tower body. The liquid supply assembly includes a central tube and a branch tube, the central tube is located in the tower body and at the center of the tower body, the length extension direction of the central tube is parallel to the axial direction of the tower body, and the outlet of the central tube forms a first nozzle; there are at least two branch tubes in the circumferential direction of the central tube, the inlet of the branch tube is connected to the central tube, and the outlet of the branch tube is located between the inner wall of the tower body and the central tube, so as to form a second nozzle between the inner wall of the tower body and the central tube. In the prepreg tower disclosed in the present application, the black liquor sprayed in through the central tube forms flash steam near the central tube, and steams the wood chips near the central tube of the wood chip column, and the black liquor sprayed in through the branch tube forms flash steam between the central tube and the inner wall of the tower body, and steams the wood chips around the wood chip column. The prepreg tower disclosed in the present scheme is combined with a central tube and a branch tube to achieve simultaneous steaming of the central and peripheral wood chips of a wood chip column, and the branch tube separately provides flash steam to the periphery of the wood chip column to ensure that the central and peripheral wood chips of the wood chip column can be effectively steamed, thereby improving the uniformity of steaming of the wood chips of the wood chip column and reducing the fluctuation of pulp quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work, and the present application can also be applied to other similar scenarios based on the provided drawings. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0019] Figure 1 It is a structural schematic diagram of a prepreg tower in the prior art;

[0020] Figure 2 It is a structural schematic diagram of the prepreg tower of the present application;

[0021] Figure 3 It is a structural schematic diagram of the prepreg tower of the present application;

[0022] Figure 4 It is a structural schematic diagram of the prepreg tower (without tower body) of this application.

[0023] The accompanying drawings are as follows:

[0024] 01-Center tube; 02-Wood chip column;

[0025] 1-tower body; 2-liquid supply assembly; 21-central tube; 22-branch tube; 3-liquid distribution tube; 4-connecting tube; 5-wood chip column. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It will be understood that the specific embodiments described herein are only used to explain the related application, rather than to limit the application. The described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0027] It should be noted that, for ease of description, only the parts related to the relevant applications are shown in the accompanying drawings. In the absence of conflict, the embodiments in this application and the features in the embodiments can be arbitrarily combined with each other, as long as the combined technical features are not contradictory. All feasible feature combinations are technical contents clearly recorded in this article. Any of the multiple sub-features contained in the same sentence can be applied independently, and does not have to be applied together with other sub-features.

[0028] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0029] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0030] See also Figure 2-Figure 4 .

[0031] Some embodiments of the present application disclose a prepreg tower, comprising a tower body 1 , wherein a liquid supply assembly 2 is arranged inside the tower body 1 for supplying black liquor to a steaming zone of the tower body 1 .

[0032] In some embodiments of the present application, the liquid supply assembly 2 includes a central tube 21 and a branch tube 22, both of which are used to supply black liquor into the tower body 1. Specifically, the central tube 21 is located in the tower body 1 and at the center of the tower body 1, the length extension direction of the central tube 21 is parallel to the axial direction of the tower body 1 (the central tube 21 is coaxial with the tower body 1, and the central tube 21 is arranged at the position where the axis of the tower body 1 is located), and the outlet of the central tube 21 forms a first nozzle; at least two branch tubes 22 are provided in the circumferential direction of the central tube 21, the inlet of the branch tube 22 is connected to the central tube 21, and the outlet of the branch tube 22 is located between the inner wall of the tower body 1 and the central tube 21, so as to form a second nozzle between the inner wall of the tower body 1 and the central tube 21. Optionally, the outlet of the branch tube 22 can be flush with the outlet of the central tube 21, can be lower than the outlet of the central tube 21, or can be higher than the outlet of the central tube 21, and the specific arrangement is designed according to the specific structure of the prepreg tower.

[0033] The central pipe 21 and the branch pipe 22 are arranged in parallel. When black liquor is supplied into the central pipe 21 , black liquor is also supplied into the branch pipe 22 .

[0034] The prepreg tower disclosed in the present application has a liquid supply component 2 composed of a central tube 21 and a branch tube 22. The central tube 21 sprays black liquor into the steaming zone of the prepreg tower. The black liquor sprayed through the central tube 21 forms flash steam near the central tube 21 (or near the axis of the tower body 1), and steams the wood chips of the wood chip column 5 in the prepreg tower near the central tube 21. The branch tube 22 sprays black liquor into the steaming zone of the prepreg tower. The black liquor sprayed through the branch tube 22 forms flash steam between the central tube 21 and the inner wall of the tower body 1 (or between the first nozzle and the inner wall of the tower body 1), and steams the wood chips around the wood chip column 5. Figure 2 As shown, the prepreg tower includes a buffer zone, a steaming zone and an impregnation zone from top to bottom. The wood chips enter the prepreg tower from the feed port of the prepreg tower and then fall down, passing through the buffer zone, the steaming zone and the impregnation zone in sequence. The falling wood chips are accumulated to form a wood chip column 5 that matches the inner cavity shape of the prepreg tower. The prepreg tower disclosed in this scheme is combined with a central tube 21 and a branch tube 22 to achieve simultaneous steaming of the center and peripheral wood chips of the wood chip column 5, and the branch tube 22 separately provides flash steam to the periphery of the wood chip column 5 to ensure that the center and periphery of the wood chip column 5 can be effectively steamed, improve the uniformity of steaming of the wood chips of the wood chip column 5, and thus reduce the fluctuation of pulp quality;

[0035] At the same time, the black liquor is distributed through the branch pipe 22, so that the concentration of the black liquor in the wood chip column 5 is reduced, and the energy concentration at the central pipe 21 is greatly reduced, which can greatly reduce the probability of odor overflowing the wood chip column 5 and reduce the environmental risks in production.

[0036] The prepreg tower disclosed in this scheme is highly practical and has a wide range of applications.

[0037] In some embodiments, the branch pipe 22 is located in the tower body 1, the inlet of the branch pipe 22 is connected to the central pipe 21, and the branch pipe 22 is arranged obliquely relative to the central pipe 21. In this embodiment, the connection position between the branch pipe 22 and the central pipe 21 can be selected according to actual needs. When the connection position between the branch pipe 22 and the central pipe 21 is close to the outlet of the central pipe 21, the angle between the branch pipe 22 and the central pipe 21 can be 80°-100°, and multiple branch pipes 22 are radially arranged in the circumferential direction of the central pipe 21.

[0038] In some embodiments, the branch pipe 22 is connected to the central pipe 21 through the liquid distributing pipe 3 , the liquid distributing pipe 3 is connected to the central pipe 21 , and the branch pipe 22 is arranged in the length direction of the liquid distributing pipe 3 .

[0039] At least two branch pipes 22 can be connected to the central pipe 21 through one liquid distributor 3. The connection position between the liquid distributor 3 and the central pipe 21 is one, and the connection position between the liquid distributor 3 and the branch pipes 22 is equal to the number of the branch pipes 22, thereby reducing the difficulty of connecting multiple (two or more) branch pipes 22 to the central pipe 21.

[0040] The number of the liquid dispensing tube 3 can be one, and the liquid dispensing tube 3 is an annular tube, which is sleeved outside the central tube 21, and multiple (two or more) branch tubes 22 are arranged along the circumference of the annular tube. Preferably, the multiple (two or more) branch tubes 22 are evenly distributed on the circumference of the annular tube.

[0041] The liquid distributing tube 3 is arc-shaped, and the central tube 21 has at least two liquid distributing tubes 3 in the circumferential direction, and each liquid distributing tube 3 is provided with at least two branch tubes 22, so as to divide the plurality of branch tubes 22 into branch tube groups equal in number to the liquid distributing tubes 3. The arc-shaped liquid distributing tube 3 can improve the flexibility of arranging the liquid distributing tube 3 in the tower body 1, and the number of liquid distributing tubes 3 used can be selected according to needs, thereby flexibly adjusting the number of branch tubes 22.

[0042] In the embodiment where the liquid distributing pipe 3 is annular or arc-shaped, the branch pipes 22 can be distributed along the circumference of the central pipe 21 , and the distances between the central pipe 21 and the branch pipes 22 along the radial direction of the tower body 1 are equal.

[0043] The dispensing tube 3 may also be linear, and multiple dispensing tubes 3 may be interconnected to form a radial shape as a whole. At least two branch tubes 22 may be arranged along the length direction of the dispensing tube 3, so that multiple layers of branch tubes 22 may be arranged in the radial direction of the central tube 21; or, multiple dispensing tubes may be arranged to form a frame-type structure, and at least two branch tubes 22 may be arranged circumferentially of the frame-type structure.

[0044] In some embodiments, Figure 3 As shown, a layer of liquid distribution pipes 3 is arranged along the radial direction of the central pipe 21, a circle of branch pipes 22 is formed in the tower body 1, and a circle of second nozzles is formed in the steaming area to optimize the uniformity of the flash steam distribution in the tower body 1.

[0045] In some embodiments, at least two layers of liquid distribution pipes 3 are arranged along the radial direction of the central pipe 21 to form at least two circles of branch pipes 22 in the tower body 1 to form more second nozzles in the steaming area and optimize the uniformity of the flash steam distribution in the tower body 1.

[0046] The distances between two adjacent layers of branch pipes 22 may be equal or unequal, and the distances between branch pipes 22 in different layers of branch pipes 22 may be equal or unequal.

[0047] The liquid distributing pipes 3 are located outside the tower body 1 , and at least two of the liquid distributing pipes 3 are connected to the portion of the central pipe 21 located outside the tower body 1 through the connecting pipe 4 . The branch pipe 22 passes through the top of the tower body 1 and is connected to the liquid distributing pipes 3 .

[0048] In this embodiment, the branch pipe 22 is suspended in the wood chip column 5 and will be affected by the downward movement of the wood chip column 5, causing the branch pipe 22 to swing. In order to solve the above problem, the branch pipe 22 is elastically connected to the tower top to absorb the swing stress of the branch pipe 22 and ensure safe operation.

[0049] The elastic connection structure adopted between the branch pipe 22 and the tower top is the same as the elastic connection structure adopted between the central pipe 21 and the tower top in the related art. This embodiment can ensure the connection strength between each branch pipe 22 and the tower top, and has high reliability.

[0050] The liquid dispensing pipe 3 may also be located inside the tower body 1, and the connecting pipe passes through the top of the tower body 1 and is connected with the portion of the central pipe 21 located outside the tower body 1. In this embodiment, the number of mounting holes opened on the top of the tower can be reduced.

[0051] The distributing pipe 3 is provided with a flow meter and a control valve to realize flow control of the branch pipe 22 connected to the distributing pipe, and to realize individual control of the flow of each distributing pipe 3 .

[0052] like Figure 2As shown, the central tube 21 includes a horizontal tube and a vertical tube, wherein the vertical tube is coaxial with the tower body 1, the horizontal tube passes through the side wall of the tower body 1, one end of the horizontal tube located inside the tower body 1 is connected to the vertical tube, and one end of the horizontal tube located outside the tower body 1 is connected to the connecting tube 4, and the horizontal tube is used to connect to the black liquor supply pipeline.

[0053] The black liquor is supplied to the horizontal pipe and the connecting pipe 4 respectively through the black liquor supply pipeline, the black liquor in the horizontal pipe enters the vertical pipe, and the black liquor in the connecting pipe 4 is supplied to the diversion pipe respectively.

[0054] The design of the liquid distribution pipe 3 can also improve the flow uniformity of the black liquor entering different branch pipes 22 to a certain extent, so that the black liquor can be evenly supplied to different positions in the circumferential direction of the steaming zone through the branch pipes 22, thereby improving the uniformity of the cross-sectional distribution of the flash steam in the wood chip column 5.

[0055] In some embodiments, the distance between the second nozzle and the inner wall of the tower body 1 does not exceed half of the distance between the inner wall of the tower body 1 and the first nozzle, that is, the second nozzle is arranged as close to the inner wall of the tower body 1 as possible so that the flash steam formed by the black liquor sprayed from the second nozzle can be dispersed as much as possible to the circumference of the wood chip column 5.

[0056] The distance between the second nozzle and the inner wall of the tower body 1 is not limited to the above embodiment, and may be other distances, which are not specifically limited here.

[0057] In some embodiments, the diameter of the central pipe 21 is greater than or equal to the diameter of the branch pipe 22 , so that the amount of black liquor discharged from the central pipe 21 is greater than or equal to the amount of black liquor discharged from a single branch pipe 22 .

[0058] Optionally, the total amount of black liquor discharged from the plurality of branch pipes 22 is smaller than the amount of black liquor discharged from the central pipe 21 .

[0059] In some embodiments, a diverter plate is provided at the outlet of the branch pipe 22 to further enhance the dispersion effect of the black liquor in the tower body and improve the uniformity of the distribution of the flash steam in the tower body 1 .

[0060] The center tube 21 is provided with a spray hole near the outlet of the center tube 21 . The spray hole is opened on the side wall of the center tube 21 . The black liquor can be sprayed out not only from the outlet nozzle of the center tube 21 , but also from the side wall of the center tube 21 .

[0061] In some embodiments, the central tube 21 and the branch tubes 22 are stainless steel tubes, and optionally, austenitic stainless steel tubes.

[0062] like Figure 2As shown, a prepreg tower is disclosed, the radius of the prepreg tower is 4100 mm, the number of branch pipes 22 is six, and the six branch pipes 22 are evenly distributed on a circumference with a radius of 3300 mm, so that the flash steam generated by the black liquor can be evenly distributed in the cross section of the wood chip column 5;

[0063] In this embodiment, every three branch pipes 22 are divided into a group, and each group is respectively installed with a flow meter and a control valve. In actual operation, the flow of each group of branch pipes 22 can be flexibly adjusted. The distribution flow rate of each branch pipe 22 is 1.7m / s, the flow of each branch pipe 22 is 30L / s, the diameter of the branch pipe 22 is 150mm, and 304L austenitic stainless steel is selected.

[0064] In the prepreg tower disclosed in this embodiment, the wood chip steaming temperature (black liquor and wood chip mixing temperature) is increased from 102°C to 105°C, saving about 30kg / adt of medium-pressure steam in the cooking tower. At the same time, due to the improvement of the uniformity of wood chip steaming, the pulp kappa fluctuation of the spray line is reduced from 1.1σ to 0.9σ, thereby improving the uniformity of cooking.

[0065] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used, and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. The scope of application involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned application concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in this application (but not limited to) to form a technical solution.

Claims

1. A prepreg tower, characterized in that: The tower body (1) comprises a tower body (1), wherein a liquid supply component (2) is arranged inside the tower body (1) and is used to supply black liquor to the steaming zone of the tower body (1). The liquid supply component (2) comprises: A central tube (21) is located at the center of the tower body (1) and is parallel to the axis of the tower body (1), and an outlet of the central tube (21) forms a first nozzle; Branch pipes (22), at least two branch pipes (22) are provided on the circumference of the central pipe (21), inlets of the branch pipes (22) are connected to the central pipe (21), and outlets of the branch pipes (22) are located between the inner wall of the tower body (1) and the central pipe (21), so as to form a second nozzle between the inner wall of the tower body (1) and the first nozzle.

2. The prepreg tower according to claim 1, characterized in that It also comprises a liquid dispensing tube (3), the branch tube (22) being connected to the central tube (21) via the liquid dispensing tube (3), and at least two branch tubes (22) being arranged on each liquid dispensing tube (3).

3. The prepreg tower according to claim 2, characterized in that The liquid dispensing pipe (3) is located outside the tower body (1), and at least two of the liquid dispensing pipes (3) are connected to a portion of the central pipe (21) located outside the tower body (1) through a connecting pipe (4). The branch pipe (22) passes through the top of the tower body (1) and is connected to the liquid separation pipe (3).

4. The prepreg tower according to claim 1, characterized in that The branch pipes (22) are evenly distributed along the circumference of the central pipe (21).

5. The prepreg tower according to claim 1, characterized in that The diameter of the central pipe (21) is greater than or equal to the diameter of the branch pipe (22).

6. The prepreg tower according to claim 1, characterized in that: The outlet of the branch pipe (22) is provided with a diverter plate.

7. The prepreg tower according to claim 1, characterized in that The central tube (21) is provided with a spray hole at a position close to the outlet of the central tube (21).

8. The prepreg tower according to claim 1, characterized in that: The central pipe (21) and the branch pipe (22) are stainless steel pipes.

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