Dissolving device for papermaking retention aid

Abstract

The utility model discloses a dissolving device for a papermaking retention aid, relates to the technical field of papermaking, and aims to solve the problem that in the prior art, a large number of granular sediments are formed on a pipe wall due to the contact of papermaking retention aid dry powder and water in a pipeline. The dissolving device for the papermaking retention aid comprises a first pipeline, a second pipeline and a dissolving tank, the first pipeline extends into the second pipeline, the first pipeline is used for conveying the papermaking retention aid, the second pipeline is used for conveying water, an outlet of the first pipeline and an outlet of the second pipeline are converged to form a converged outlet, and the converged outlet is located above the dissolving tank. And the converging outlet is used for mixing the papermaking retention aid discharged from the first pipeline and the water discharged from the second pipeline. According to the dissolving device for the papermaking retention aid, the cleanness and dryness of the retention aid pipeline can be ensured, the possibility that the retention aid is insufficiently dispersed in the pipeline to form deposition is avoided, and better solubility is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking, in particular to a dissolving device for a papermaking retention aid. Background Art

[0002] In papermaking production, fillers are the auxiliary materials with the largest consumption, and the particle size is generally 0.2μm - 10μm, while the mesh number of the copper mesh used in the paper machine is relatively large, which is 40 - 100 meshes, equivalent to 150μm - 250μm. Generally, during the papermaking process, only about 50% of the fillers are retained, and the other half will be lost with the white water. The retention aid has a coagulation and flocculation effect. Therefore, a retention aid can be used to improve the retention rate of fine fibers and fillers in the paper stock and reduce the solid content of fines in the water.

[0003] When preparing the existing papermaking retention aid polyacrylamide, generally, the powdered polyacrylamide and warm water are mixed in the same section of pipeline. After the polyacrylamide is mixed with water, a large amount of granular or even very serious "jelly-like" deposits will form on the pipe wall, and the dispersion effect is not good. Once added to the paper machine system, it will cause holes in the paper and paper breaks, seriously affecting the efficiency of the paper machine. Therefore, during the dissolution process of the papermaking retention aid polyacrylamide, it is necessary to frequently clean the pipe wall and pipe orifice manually. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a dissolving device for a papermaking retention aid, which can ensure the cleaning and drying of the retention aid pipeline, avoid the insufficient dispersion of the retention aid in the pipeline to form deposits, and achieve better solubility.

[0005] The utility model provides a dissolving device for a papermaking retention aid, including: a first pipeline, a second pipeline and a dissolving tank. The first pipeline extends into the second pipeline. The first pipeline is used for transporting the papermaking retention aid, the second pipeline is used for transporting water. The outlet of the first pipeline and the outlet of the second pipeline converge into a converging outlet, and the converging outlet is located above the dissolving tank. The converging outlet is used for mixing the papermaking retention aid coming out of the first pipeline and the water coming out of the second pipeline.

[0006] Compared with the prior art, the dissolving device for papermaking retention agent provided by the utility model includes a first pipeline, a second pipeline and a dissolving tank, and the first pipeline extends into the second pipeline. Among them, the first pipeline is used to transport the dry powder of papermaking retention agent, and the second pipeline is used to transport water. The outlets of the first pipeline and the second pipeline converge into a converging outlet. Therefore, when the first pipeline transports the papermaking retention agent and at the same time the second pipeline transports water, the dry powder of the papermaking retention agent and water can be mixed through the converging outlet where the outlets of the first pipeline and the second pipeline converge. Then, since the converging outlet is located above the dissolving tank, the mixed papermaking retention agent and water can directly enter the dissolving tank for dissolution. Therefore, the embodiment of the utility model realizes the separate addition of the dry powder of the papermaking retention agent and water into the dissolving tank in the form of a sleeve. The first pipeline transports the papermaking retention agent, and the second pipeline transports water and they are mixed at the outlet, which can avoid the state that a large amount of granular or even very serious "jelly-like" deposits will form on the pipe wall due to the contact between the dry powder of the papermaking retention agent and water in the pipeline, thus ensuring the cleanliness and dryness of the dry powder pipeline and avoiding the formation of poor dispersion.

[0007] As can be seen from the above, the dissolving device for papermaking retention agent in the embodiment of the utility model can ensure the cleanliness and dryness of the retention agent pipeline, avoid the deposition caused by insufficient dispersion of the retention agent in the pipeline, and achieve better solubility. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The drawings described herein are used to provide a further understanding of the utility model and constitute a part of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an improper limitation to the utility model. In the drawings:

[0009] Figure 1 It is a schematic structural diagram of the dissolving device for papermaking retention agent in an exemplary embodiment of the utility model.

[0010] REFERENCE SIGNS:

[0011] 100 - First pipeline, 200 - Second pipeline, 300 - Dissolving tank, 400 - Papermaking retention agent feed pipeline, 500 - First purging unit, 600 - First valve, 700 - Retention agent storage tank, 800 - Feed screw, 900 Second purging unit, 1000 - Water inlet pipeline, 1100 - Second valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the following further describes the utility model in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0013] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0014] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined. The meaning of "several" is one or more, unless otherwise specifically defined.

[0015] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present utility model.

[0016] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "joined" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0017] In papermaking production, fillers are the auxiliary materials with the largest consumption, and their particle sizes are generally 0.2μm - 10μm, while the mesh of the copper mesh used in paper machines is relatively large, being 40 mesh - 100 mesh, which is equivalent to 150μm - 250μm. Generally, during the papermaking process, only about 50% of the fillers are retained, and the other half will be lost with the white water.

[0018] Solid retention aids are used in the papermaking process to improve the retention and filtration aid effects of the stock going onto the wire. Solid retention aids (cationic polyacrylamide) are widely used in papermaking production to improve the retention rate of the stock on the wire section and the water filtration efficiency. When used as a retention aid, its molecular weight is relatively high (8 million - 10 million). It is extremely easy to form flocs when encountering water, and the flocs cannot be further evenly dissolved in water within a short time, resulting in the inability to use the retention aid normally. Therefore, how to evenly disperse and dissolve the solid retention aid powder into water is particularly crucial. The retention aid has coagulation and flocculation effects. Therefore, the retention aid can be used to improve the retention rate of fine fibers and fillers in the furnish and reduce the solid content of fines in water.

[0019] When preparing the existing papermaking retention aid polyacrylamide, generally, powdered polyacrylamide and warm water are mixed in the same section of pipeline. After polyacrylamide is mixed with water, a large number of granular or even very serious "jelly-like" deposits will form on the pipe wall, and the dispersion effect is not good. Once added to the paper machine system, it will cause holes on the paper surface and paper breaks, seriously affecting the efficiency of the paper machine. Therefore, during the dissolution process of the papermaking retention aid polyacrylamide, it is necessary to frequently clean the pipe wall and pipe orifice manually.

[0020] To solve the above problems, the embodiment of the present utility model provides a dissolution device for a papermaking retention aid to solve the problem that a large number of granular or even very serious "jelly-like" deposits will form on the pipe wall due to the contact between the dry powder of the papermaking retention aid and water in the pipeline in the prior art. It can ensure the cleanliness and dryness of the retention aid pipeline, avoid the possibility of insufficient dispersion and deposition of the retention aid in the pipeline, and achieve better solubility. It should be understood that this dissolution device for the papermaking retention aid is applied in the papermaking process.

[0021] Figure 1 The structural schematic diagram of the dissolution device for the papermaking retention aid according to the exemplary embodiment of the present utility model is shown. As Figure 1 shown, the dissolution device for the papermaking retention aid provided by the embodiment of the present utility model includes a first pipeline 100, a second pipeline 200, and a dissolution tank 300. The first pipeline 100 extends into the second pipeline 200. The first pipeline 100 is used to convey the papermaking retention aid, and the second pipeline 200 is used to convey water. The outlet of the first pipeline 100 and the outlet of the second pipeline 200 converge into a convergence outlet, and the convergence outlet is located above the dissolution tank 300. The convergence outlet is used to mix the papermaking retention aid coming out of the first pipeline 100 and the water coming out of the second pipeline 200.

[0022] It can be understood that the above-mentioned first pipeline 100 and second pipeline 200 can be set to the same length. The diameter of the second pipeline 200 is larger than that of the first pipeline 100, and there is a space between the second pipeline 200 and the first pipeline 100. Water can flow out through the space between the second pipeline 200 and the first pipeline 100.

[0023] In specific implementation, when the first pipeline 100 conveys a papermaking retention aid and the second pipeline 200 conveys water simultaneously, the dry powder of the papermaking retention aid and water can be mixed at the confluence outlet where the outlet of the first pipeline 100 and the outlet of the second pipeline 200 converge. Then, since the confluence outlet is located above the dissolution tank 300, the mixed papermaking retention aid and water can directly enter the dissolution tank 300 for dissolution. Therefore, the embodiment of the present utility model realizes the separate addition of the dry powder of the papermaking retention aid and water into the dissolution tank in the form of a sleeve. The first pipeline 100 conveys the papermaking retention aid, and the second pipeline 200 conveys water, and they are mixed at the outlet, which can avoid the state where a large amount of granular or even very serious "jelly-like" deposits will form on the pipe wall due to the contact between the dry powder of the papermaking retention aid and water in the pipeline, thereby ensuring the cleanliness and dryness of the dry powder pipeline and avoiding the formation of poor dispersion.

[0024] In one example, the outlets of the above-mentioned first pipeline 100 and the second pipeline 200 are in the same direction. When the first pipeline 100 and the second pipeline 200 are set to the same length, the outlets of the first pipeline 100 and the second pipeline 200 can be on the same horizontal line. When the papermaking retention aid comes out from the outlet of the first pipeline 100 and water comes out from the outlet of the second pipeline 200, the papermaking retention aid and water will be instantaneously mixed. At this time, the part where the papermaking retention aid and water are instantaneously mixed can be defined as the confluence outlet.

[0025] In another example, a confluence outlet can be separately provided at the outlets of the above-mentioned first pipeline 100 and the second pipeline 200. The confluence outlet can be simultaneously communicated with the outlet of the first pipeline 100 and the outlet of the second pipeline 200, so that after the papermaking retention aid coming out from the first pipeline 100 and the water coming out from the second pipeline 200 are mixed at the confluence outlet, they enter the dissolution tank.

[0026] In an implementable manner, the dissolution device for the papermaking retention aid in the embodiment of the present utility model further includes a papermaking retention aid feed pipeline 400 and a first purging unit 500. The first purging unit 500 is communicated with the papermaking retention aid feed pipeline 400, and the papermaking retention aid feed pipeline 400 is communicated with the first pipeline 100. The papermaking retention aid feed pipeline 400 is used to convey the papermaking retention aid to the first pipeline 100, and the first purging unit 500 is used to purge the papermaking retention aid in the papermaking retention aid feed pipeline 400 into the interior of the first pipeline 100. It should be understood that the first purging unit 500 can be a purging blower.

[0027] In specific implementation, since the first purging unit 500 is connected to the papermaking retention aid feeding pipeline 400, the above-mentioned first purging unit 500 can use gas to blow the papermaking retention aid into the papermaking retention aid feeding pipeline 400. At this time, since the papermaking retention aid feeding pipeline 400 is connected to the first pipeline 100, the first purging unit 500 can use the papermaking retention aid feeding pipeline 400 to continue blowing the papermaking retention aid into the first pipeline 100. Through a specific gas compressed air design, the cleanliness and dryness of the dry powder pipeline are ensured, the formation of poor dispersion and the deposition formed by insufficient dispersion in the pipeline are avoided, and the purpose of better dissolution is achieved.

[0028] The gas used for the above purging can be air, nitrogen, etc., and no limitation is made here.

[0029] In an alternative manner, the dissolution device of the papermaking retention aid according to the embodiment of the present invention further includes a first valve 600 installed between the papermaking retention aid feeding pipeline 400 and the first pipeline 100. Among them, the first valve 600 can be used to control the shut-off of the papermaking retention aid feeding pipeline 400 and the first pipeline 100 and the amount of the papermaking retention aid dry powder entering the first pipeline 100.

[0030] In an implementable manner, the dissolution device of the papermaking retention aid according to the embodiment of the present invention further includes a papermaking retention aid storage tank 700, and the papermaking retention aid storage tank 700 is connected to the papermaking retention aid feeding pipeline 400. It should be understood that the papermaking retention aid storage tank 700 is used to store the papermaking retention aid dry powder to be used.

[0031] It can be understood that a feeding screw 800 can also be installed between the above-mentioned papermaking retention aid storage tank 700 and the papermaking retention aid feeding pipeline 400, and the feeding screw 800 is used to convey the papermaking retention aid dry powder in the papermaking retention aid storage tank 700 into the papermaking retention aid feeding pipeline 400.

[0032] Exemplarily, the dissolution device of the papermaking retention aid according to the embodiment of the present invention further includes a second purging unit 900, the second purging unit 900 is connected to the first pipeline 100, the second purging unit 900 is located between the first valve 600 and the first pipeline 100, and the second purging unit 900 is used to purge the papermaking retention aid in the first pipeline 100 to the confluence outlet. It should be understood that the second purging unit 900 can be a purging fan.

[0033] In specific implementation, the second purging unit 900 can be used to continue conveying the papermaking retention aid coming from the papermaking retention aid feeding pipeline 400 into the first pipeline 100, and purge the papermaking retention aid to the confluence outlet to be mixed with the water coming from the second pipeline 200.

[0034] In an implementable manner, the dissolving device of the papermaking retention aid according to the embodiment of the present utility model further includes a water inlet pipe 1000, and the water inlet pipe 1000 is communicated with the second pipe 200. The water inlet pipe 1000 is used for conveying warm water to the second pipe 200.

[0035] Exemplarily, a second valve 1100 is further installed between the water inlet pipe 1000 and the second pipe 200 of the embodiment of the present utility model. It should be understood that the second valve 1100 can control the cut-off between the water inlet pipe 1000 and the second pipe 200 and the flow rate of the warm water entering the second pipe 200. Thus, an appropriate amount of warm water can be conveyed into the second pipe 200 according to the demand for warm water.

[0036] In an optional manner, the dissolving device of the papermaking retention aid according to the embodiment of the present utility model further includes a stirring device arranged in the dissolving tank 300. The stirring device can further stir and disperse the mixture of the retention aid and water entering the dissolving tank 300, so that the dispersibility of the retention aid is better.

[0037] In an implementable manner, the dissolving device of the papermaking retention aid according to the embodiment of the present utility model further includes a heating element arranged outside the dissolving tank 300. When the temperature of the mixture of the retention aid and water in the dissolving tank is too low to affect the solubility, the heating element outside the dissolving tank 300 can be turned on to heat the mixture of the retention aid and water in the dissolving tank, so that the dispersibility of the retention aid is better.

[0038] Exemplarily, the above-mentioned first purging unit 500 and second purging unit 900 can be air compression pumps. Through a specific gas compression air design, the cleanliness and dryness of the dry powder pipeline are ensured, the formation of poor dispersion and the deposition formed by insufficient dispersion in the pipeline are avoided, and the purpose of better dissolution is achieved.

[0039] As can be seen from the above, the dissolving device for papermaking retention aid provided by the embodiment of the present utility model includes a first pipeline, a second pipeline and a dissolving tank, and the first pipeline extends into the second pipeline. Among them, the first pipeline is used to transport the dry powder of papermaking retention aid, and the second pipeline is used to transport water. The outlet of the first pipeline and the outlet of the second pipeline converge into a converging outlet. Therefore, when the first pipeline transports the papermaking retention aid and at the same time the second pipeline transports water, the dry powder of papermaking retention aid and water can be mixed through the converging outlet where the outlet of the first pipeline and the outlet of the second pipeline converge. Then, since the converging outlet is located above the dissolving tank, the mixed papermaking retention aid and water can directly enter the dissolving tank for dissolution. Therefore, the embodiment of the present utility model realizes the separate addition of the dry powder of papermaking retention aid and water into the dissolving tank in the form of a sleeve. The first pipeline transports the papermaking retention aid, and the second pipeline transports water and they are mixed at the outlet, which can avoid the state that a large amount of granular or even very serious "jelly-like" sediments will form on the pipe wall due to the contact between the dry powder of papermaking retention aid and water in the pipeline, thus ensuring the cleanliness and dryness of the dry powder pipeline and avoiding the formation of poor dispersion.

[0040] On this basis, the sufficient dispersion and dissolution of the retention aid polyacrylamide can form a completely uniform dispersion liquid, thereby reducing the paper breakage of the paper machine caused thereby and improving the production efficiency.

[0041] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0042] The above is only the specific implementation manner of the present utility model. Obviously, various modifications and combinations can be made to it without departing from the spirit and scope of the present utility model. Accordingly, this specification and the drawings are only exemplary descriptions of the present utility model defined by the appended claims, and are considered to have covered any and all modifications, variations, combinations or equivalents within the scope of the present utility model. Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the intention of the present utility model includes these changes and modifications. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the said claims.

Claims

1. A dissolving device for a papermaking retention aid, characterized in that: include: A first pipe, a second pipe and a dissolving tank, wherein the first pipe extends into the second pipe, the first pipe is used to transport a papermaking retention agent, the second pipe is used to transport water, the outlet of the first pipe and the outlet of the second pipe are combined into a confluent outlet, the confluent outlet is located above the dissolving tank, and the confluent outlet is used to mix the papermaking retention agent from the first pipe and the water from the second pipe; The papermaking retention agent dissolving device also includes a papermaking retention agent feed pipeline and a first purge unit, wherein the first purge unit is communicated with the papermaking retention agent feed pipeline, the papermaking retention agent feed pipeline is communicated with the first pipeline, the papermaking retention agent feed pipeline is used to transport the papermaking retention agent to the first pipeline, and the first purge unit is used to purge the papermaking retention agent in the papermaking retention agent feed pipeline into the inside of the first pipeline.

2. The dissolving device for papermaking retention aid according to claim 1, characterized in that: A first valve is installed between the papermaking retention agent feeding pipeline and the first pipeline.

3. The dissolving device of the papermaking retention aid according to claim 1, characterized in that: The papermaking retention aid dissolving device further comprises a papermaking retention aid storage tank, and the papermaking retention aid storage tank is communicated with the papermaking retention aid feeding pipeline.

4. The dissolving device for papermaking retention aid according to claim 2, characterized in that: The papermaking retention agent dissolving device further comprises a second purge unit, which is communicated with the first pipeline and is used for blowing the papermaking retention agent in the first pipeline to the confluent outlet.

5. The dissolving device for papermaking retention aid according to claim 4, characterized in that: The second purge unit is located between the first valve and the first pipeline.

6. The dissolving device of the papermaking retention aid according to claim 1, characterized in that: The dissolving device of the papermaking retention aid further comprises a water inlet pipe, which is communicated with the second pipe and is used for conveying warm water to the second pipe.

7. The dissolving device for papermaking retention aid according to claim 6, characterized in that: A second valve is installed between the water inlet pipe and the second pipe.

8. The papermaking retention aid dissolving device according to any one of claims 1 to 7, characterized in that: The papermaking retention aid dissolving device further comprises a stirring device arranged in the dissolving tank.

9. The papermaking retention aid dissolving device according to any one of claims 1 to 7, characterized in that: The papermaking retention aid dissolving device further comprises a heating element arranged outside the dissolving tank.

Images