A paper machine retention and drainage agent injection dosing device and method

Abstract

The application discloses a kind of paper machine retention and drainage aid injection dosing device and method, including input end and the mixing end being connected with the input end, the input end includes liquid supply pump, the liquid inlet of the liquid supply pump is connected with white water supply pipe, the liquid outlet of the liquid supply pump is connected with filter section by pipeline, the liquid outlet of the filter section is connected with premixing end, the premixing end is provided two sections, and pressure screen is set between the two premixing ends, the side of the premixing end away from pressure screen is connected on the injector of paper machine, the white water supply pipe is connected with paper machine self-production white water pipeline, the white water supply pipe is provided at least 2 groups and parallel, and valve is provided on each group of white water supply pipe, the premixing end includes first premixing section and second premixing section, the first premixing section and second premixing section are arranged on the connecting pipeline between the two premixing ends set pressure screen.

Description

Technical Field

[0001] This invention belongs to the field of papermaking technology, specifically relating to a paper machine retention and filtration aid spraying device and method. Background Technology

[0002] In the pulp and paper production process, retention and filtration aids (such as cationic polyacrylamide CPAM) are core chemicals in the wet end of paper machines. Their main functions are to improve the retention of fine fibers and fillers, accelerate wire filtration, improve paper uniformity and physical properties, and reduce white water solids loss. Currently, our existing paper machine flow system has many pain points in the addition of retention and filtration aids: poor mixing uniformity of aids, low flocculation efficiency, requiring excessive addition to ensure production results, resulting in high chemical consumption costs; the entire process uses clean water for dissolving and diluting aids, resulting in high consumption of clean water, high water treatment and water supply energy costs, single dosing point, delayed mixing, short duration of action of aids, unstable retention rate, and problems such as paper dusting, poor filtration, paper breakage, and high white water concentration; white water resources are not utilized, and a large amount of production white water is directly sent to the wastewater treatment system, increasing the environmental treatment load and operating costs. Summary of the Invention

[0003] The purpose of this invention is to provide a paper machine retention and filtration aid spraying device and method to solve the problems mentioned in the background art.

[0004] The objective of this invention is achieved through the following technical solution: a paper machine retention and filtration aid spraying and dosing device, comprising an input end and a mixing end connected to the input end, the input end comprising a liquid supply pump, the inlet end of the liquid supply pump being connected to a white water supply pipe, and the outlet end of the liquid supply pump being connected to a filtration section via a pipe;

[0005] The outlet end of the filtration section is connected to the premixing end. The premixing end is provided in two sections, and a pressure screen is provided between the two sections of the premixing end. The side of the premixing end away from the pressure screen is connected to the ejector of the paper machine.

[0006] Furthermore, the white water supply pipe is connected to the white water pipeline produced by the paper machine, and at least two sets of white water supply pipes are arranged in parallel, with a valve installed on each set of white water supply pipes.

[0007] Furthermore, the premixing end includes a first premixing section and a second premixing section, and the first premixing section and the second premixing section are disposed on a connecting pipe between the two premixing ends, on which a pressure screen is disposed.

[0008] Furthermore, the first premixing section and the second premixing section include a fixed end and a stirring end connected to the fixed end, wherein the stirring end is configured with a spiral section structure;

[0009] The fixed end includes a motor and a stirring rod connected to the output end of the motor, and the stirring rod is fixedly provided with a stirring end.

[0010] Furthermore, a dosing chamber is provided on the pipeline at the location of the first premixing section. The dosing chamber has a rectangular cavity structure. A dispersing through pipe is fixedly provided at the bottom of the dosing chamber. Several dispersing through pipes are evenly distributed and are connected to the pipeline at the location of the first premixing section.

[0011] Furthermore, an arc-shaped plate is provided on the pipe on the side of the first premixing section near the pressure screen, and the arc-shaped plate is provided with several through holes, the diameters of the arc-shaped plate being spaced apart and staggered.

[0012] Furthermore, a gap is left between the curved plate and the highest or lowest point of the pipe.

[0013] Furthermore, the second premixing section may or may not have a dosing chamber.

[0014] Furthermore, the filtration section includes three sets of parallel filtration units, wherein each set of filtration units includes a multi-disc vacuum filter and a filter arranged in series, and the filter is a mesh filter.

[0015] A method for applying a paper machine retention and filtration aid spray dosing device includes the following steps;

[0016] The white water produced by the paper machine enters the white water supply pipe through the pipeline, and is sent to the filtration section by the liquid supply pump. After passing through the multi-disc vacuum filter and filter, it enters the premixing end.

[0017] The premixing end is equipped with a first premixing section and a second premixing section. A dosing chamber is set in the pipeline where the first premixing section is located. The medicine liquid entering the pipeline is mixed by the stirring end on the first and second premixing sections. The medicine liquid enters the spiral section through the feed port and then enters the pipeline through the spiral section to mix with white water.

[0018] An arc-shaped plate is installed on the pipe on the side of the first premixing section near the pressure screen. The arc-shaped plate has several through holes. The diameters of the arc-shaped plates are spaced apart and staggered. The installation of the arc-shaped plate promotes the mixing of the retention aid and white water.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] This invention reduces the intake of clean water and the discharge of wastewater, thereby reducing production water consumption and COD emissions, and complies with environmental protection and energy conservation policies; it also stabilizes production conditions, reduces equipment maintenance pressure, and minimizes abnormal production losses.

[0021] This invention utilizes the white water produced in papermaking to completely replace the diluted clean water, achieving a closed-loop water resource reuse and providing the dual benefits of water conservation and pollution reduction.

[0022] This invention sets up a first premixing section and a second premixing section to fully mix the slurry and white water in the pipeline. By setting different dosing points, it achieves efficient mixing of additives, greatly improves the utilization rate of the additives, and reduces the addition of additives from the source. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall connection of the present invention;

[0024] Figure 2 This is the present invention. Figure 1 Schematic diagram of the middle filter unit;

[0025] Figure 3 This is a schematic diagram showing the connection between the first premixing section and the second premixing section of the present invention;

[0026] Figure 4 This is a schematic diagram of the installation of the arc-shaped plate of the present invention;

[0027] Figure 5 This is a schematic diagram of another installation state of the arc-shaped plate of the present invention;

[0028] Figure 6 This is a schematic diagram of the arc-shaped plates of the present invention arranged inside the pipe. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "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 limitations on this invention.

[0032] like Figure 1-6 As shown, a paper machine retention and filter aid spraying dosing device includes an input end 1 and a mixing end 2 connected to the input end 1. The input end 1 includes a liquid supply pump 3. The inlet end of the liquid supply pump 3 is connected to a white water supply pipe 4, and the outlet end of the liquid supply pump 3 is connected to a filter section 5 through a pipe.

[0033] The liquid outlet of the filtration section 5 is connected to the premixing end 6. The premixing end 6 is provided in two sections, and a pressure screen 7 is provided between the two sections of the premixing end 6. The side of the premixing end 6 away from the pressure screen 7 is connected to the ejector of the paper machine 8.

[0034] In a further preferred embodiment of the present invention, the white water supply pipe 4 is connected to the white water pipeline produced by the paper machine, and at least two sets of white water supply pipes 4 are arranged in parallel, with a valve provided on each set of white water supply pipes 4.

[0035] The above embodiment sets up two sets of parallel white water supply pipes 4, which can be used in standby mode or simultaneously.

[0036] In a further preferred embodiment of the present invention, the premixing end 6 includes a first premixing section 9 and a second premixing section 10, wherein the first premixing section 9 and the second premixing section 10 are disposed on a connecting pipe on which a pressure screen 7 is disposed between the two premixing ends 6.

[0037] In the above embodiment, a first premixing section 9 and a second premixing section 10 are set up in the pipeline to promote the mixing of additives and white water and send them to the paper machine.

[0038] In a further preferred embodiment of the present invention, the first premixing section 9 and the second premixing section 10 include a fixed end 11 and a stirring end 12 connected to the fixed end 11, wherein the stirring end 12 is configured as a spiral section structure.

[0039] The fixed end 11 includes a motor and a stirring rod 13 connected to the output end of the motor, and a stirring end 12 is fixedly provided on the stirring rod 13.

[0040] In the above embodiment, a stirring end 12 is provided inside the pipeline. The stirring end is spiral-shaped and promotes the mixing of the additive and white water in the pipeline. The stirring end has a spiral blade structure.

[0041] In a further preferred embodiment of the present invention, a dosing chamber 14 is provided on the pipeline at the location of the first premixing section 9. The dosing chamber 14 is a rectangular cavity structure. A dispersing through pipe 15 is fixedly provided at the bottom of the dosing chamber 14. Several dispersing through pipes 15 are evenly distributed and are connected to the pipeline at the location of the first premixing section 9.

[0042] In the above embodiment, a dosing chamber 14 is provided on the pipeline at the location of the first premixing section 9. The dosing chamber 14 is located at the location of the stirring end 12 or at the upstream pipeline of the stirring end 12. The dispersion through pipe 15 is fixedly connected to the pipeline. By setting several dispersion through pipes, it is ensured that the additives can be fully mixed when they enter the pipeline.

[0043] In a further preferred embodiment of the present invention, an arc-shaped plate 16 is provided on the pipe of the first premixing section 9 near the pressure screen 7, and the arc-shaped plate 16 is provided with a plurality of through holes 17, the diameters of the arc-shaped plates 16 being spaced apart and staggered.

[0044] The arc-shaped plates 16 in the above embodiment are arranged in an alternating manner, with one row above the pipe and another row below the pipe. The two rows are separated by an empty pipe section, and the arc-shaped plates in each row are spaced apart.

[0045] In a further preferred embodiment of the present invention, a gap is left between the arc-shaped plate 16 and the highest or lowest point of the pipe.

[0046] The purpose of creating a gap between the pipe and the arc plate 16 in the above embodiment is to minimize the resistance of the additives and white water in the presence of the arc plate.

[0047] The arc-shaped plate and the pipe in the above embodiment form a gap space, which achieves the effect of mixing the additives without creating a large resistance to the pipe.

[0048] In a further preferred embodiment of the present invention, the second premixing section 10 may or may not be provided with a dosing chamber 14.

[0049] In the above embodiments, the dosing chamber 14 may or may not be added to the second premixing stage 10 depending on the dilution concentration.

[0050] In a further preferred embodiment of the present invention, the filtration section 5 includes three sets of parallel filtration units 18, wherein each set of filtration units 18 includes a multi-disc vacuum filter 19 and a filter 20 arranged in series, and the filter 20 is a mesh filter.

[0051] The above embodiment sets up three sets of filtration units to fully filter the white water from the paper machine, forming white water to replace the water used to dilute the retention and filter aids, eliminating the need for water to dilute the aids and saving production costs.

[0052] A method for applying a paper machine retention and filtration aid spray dosing device includes the following steps;

[0053] The white water produced by the paper machine enters the white water supply pipe through the pipeline, and is sent to the filtration section by the liquid supply pump. After passing through the multi-disc vacuum filter and filter, it enters the premixing end.

[0054] The premixing end is equipped with a first premixing section and a second premixing section. A dosing chamber is set in the pipeline where the first premixing section is located. The medicine liquid entering the pipeline is mixed by the stirring end on the first and second premixing sections. The medicine liquid enters the spiral section through the feed port and then enters the pipeline through the spiral section to mix with white water.

[0055] An arc-shaped plate is installed on the pipe on the side of the first premixing section near the pressure screen. The arc-shaped plate has several through holes. The diameters of the arc-shaped plates are spaced apart and staggered. The installation of the arc-shaped plate promotes the mixing of the retention aid and white water.

[0056] This invention enables precise dosing of retention and filtration aids, efficient reaction, and white water recycling, significantly reducing reagent and water consumption, thereby achieving cost reduction, improved production stability, and reduced environmental impact. It possesses strong research and development necessity and practical production value.

[0057] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0058] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A paper machine retention and filtration aid spraying device, characterized in that: It includes an input end (1) and a mixing end (2) connected to the input end (1). The input end (1) includes a liquid supply pump (3). The inlet end of the liquid supply pump (3) is connected to a white water supply pipe (4). The outlet end of the liquid supply pump (3) is connected to a filter section (5) through a pipe. The outlet end of the filter section (5) is connected to the premixing end (6). The premixing end (6) is provided in two sections, and a pressure screen (7) is provided between the two sections of the premixing end (6). The side of the premixing end (6) away from the pressure screen (7) is connected to the ejector of the paper machine (8).

2. The paper machine retention and filtration aid injection dosing device according to claim 1, characterized in that: The white water supply pipe (4) is connected to the white water pipeline produced by the paper machine. At least two sets of white water supply pipes (4) are arranged in parallel, and each set of white water supply pipes (4) is equipped with a valve.

3. The paper machine retention and filtration aid injection dosing device according to claim 2, characterized in that: The premix end (6) includes a first premix section (9) and a second premix section (10), and the first premix section (9) and the second premix section (10) are disposed on a connecting pipe between the two premix ends (6) and a pressure screen (7) is disposed.

4. The paper machine retention and filtration aid injection dosing device according to claim 3, characterized in that: The first premixing section (9) and the second premixing section (10) include a fixed end (11) and a stirring end (12) connected to the fixed end (11). The stirring end (12) is a spiral section structure. The fixed end (11) includes a motor and a stirring rod (13) connected to the output end of the motor, and a stirring end (12) is fixedly provided on the stirring rod (13).

5. The paper machine retention and filtration aid injection dosing device according to claim 3, characterized in that: A dosing chamber (14) is provided on the pipeline where the first premixing section (9) is located. The dosing chamber (14) is a rectangular cavity structure. A dispersing through pipe (15) is fixedly provided at the bottom of the dosing chamber (14). Several dispersing through pipes (15) are evenly distributed and are connected to the pipeline where the first premixing section (9) is located.

6. The paper machine retention and filtration aid injection dosing device according to claim 3, characterized in that: An arc plate (16) is provided on the pipe on the side of the first premix section (9) near the pressure screen (7). The arc plate (16) has several through holes (17) and the diameters of the arc plates (16) are spaced apart and staggered.

7. The paper machine retention and filtration aid injection dosing device according to claim 6, characterized in that: A gap is left between the arc plate (16) and the highest or lowest point of the pipe.

8. The paper machine retention and filtration aid injection dosing device according to claim 7, characterized in that: The second premixing section (10) may or may not have a dosing chamber (14).

9. The paper machine retention and filtration aid injection dosing device according to claim 8, characterized in that: The filter section (5) includes three sets of parallel filter units (18), wherein each filter unit (18) includes a multi-disc vacuum filter (19) and a filter (20) arranged in series, and the filter (20) is a mesh filter.

10. A method for applying the paper machine retention and filtration aid injection dosing device according to claim 9, characterized in that: Includes the following steps; The white water produced by the paper machine enters the white water supply pipe through the pipeline, and is sent to the filtration section by the liquid supply pump. After passing through the multi-disc vacuum filter and filter, it enters the premixing end. The premixing end is equipped with a first premixing section and a second premixing section. A dosing chamber is set in the pipeline where the first premixing section is located. The medicine liquid entering the pipeline is mixed by the stirring end on the first premixing section and the second premixing section. The medicine liquid enters the spiral section through the feed port and enters the pipeline through the spiral section to mix with white water. An arc-shaped plate is installed on the pipe on the side of the first premixing section near the pressure screen. The arc-shaped plate has several through holes. The diameters of the arc-shaped plates are spaced apart and staggered. The installation of the arc-shaped plate promotes the mixing of the retention aid and white water.

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