Papermaking surface sizing tailing recovery device

Abstract

The utility model relates to a papermaking surface sizing tailing recovery device, which comprises a surface sizing storage tank, a sizing agent storage tank, a sizing agent storage tank, a sizing agent storage tank and a sizing agent storage tank, wherein the surface sizing agent storage tank is used for storing sizing materials for papermaking surface sizing; an inlet of the feeding sieve is connected to the surface glue storage tank; an inlet of the front storage tank is connected to an outlet of the feeding sieve; a feeding port of the first-section screen is connected to a discharging port of the front storage tank, and a discharging port of the first-section screen is connected to a paper machine sizing roller; a feeding opening of the tailing recycling screen is connected to a slag discharging opening of the first-section screen, and a discharging opening of the tailing recycling screen is connected to an inlet of the feeding screen. And good sizing materials in tailings discharged by the first-section screen are recycled by additionally arranging the tailings recycling screen, so that waste of resources is avoided, and meanwhile, the raw material cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of papermaking, and in particular to a device for recovering surface sizing tailings from papermaking. Background Art

[0002] With the widespread application of modern high-speed printing presses, the surface strength of paper has become an important indicator of white cardboard, which is crucial to the printing quality and the operating efficiency of the printing press. One of the factors that affect the surface strength of paper is the cleanliness of the glue. The removal of impurities in the glue and the full recycling of the glue have become urgent problems to be solved in the current technical field. The raw material for paper surface sizing is cassava starch or corn starch. The starch is mixed with water, reduced viscosity, screened, high-temperature cooked and diluted to make the machine glue. The prepared glue is beaten to the feed screen and then to the front tank of the sizing machine. Because the starch contains impurities, it needs to be screened before being put on the machine to remove the impurities in the glue as much as possible, and then pumped to the paper machine glue roller to apply glue to both sides of the paper. In order to meet the continuous supply of good glue required for production and ensure that the pressure difference of the first screen is not too large, the first screen needs to discharge slag continuously. The tailing valve of the first screening is opened to 27% to continuously discharge slag and discharge it to the ditch without recycling.

[0003] However, after the rubber material is screened by a first-stage screen, there is still good rubber in the discharged tailings, which can be recycled, and continuous discharge of materials will cause waste. Utility Model Content

[0004] In view of the above problems, the present application provides a papermaking surface sizing tailings recovery device to solve the problem that the existing paper surface sizing material still contains good glue in the tailings discharged after a period of screening and brushing before loading, while the tailings are directly discharged into the ditch, causing waste.

[0005] To achieve the above purpose, the inventor provides a papermaking surface sizing tailings recovery device, comprising:

[0006] Surface glue storage tank, the surface glue storage tank is used to store glue for papermaking surface sizing;

[0007] A feed screen, the inlet of which is connected to the surface glue storage tank;

[0008] A front-end material storage tank, the inlet of which is connected to the outlet of the feed screen;

[0009] A screen of one section, wherein the feed port of the screen of one section is connected to the discharge port of the material storage tank in front of the machine, and the discharge port of the screen of one section is connected to the sizing roller of the paper machine;

[0010] A tailings recovery screen, wherein the feed port of the tailings recovery screen is connected to the discharge port of the first stage screen, and the discharge port of the tailings recovery screen is connected to the inlet of the feed screen.

[0011] In some embodiments, the filtration accuracy of the tailings recovery screen is 300um.

[0012] In some embodiments, the tailings recovery screen is a differential pressure two-stage screen.

[0013] In some embodiments, the sieve filtration accuracy of the differential pressure two-stage sieve is 70um.

[0014] In some embodiments, it also includes:

[0015] A first pressure sensor, wherein the first pressure sensor is arranged at a feed port of the differential pressure type two-stage screen;

[0016] A second pressure sensor, wherein the second pressure sensor is arranged at the discharge port of the differential pressure type two-stage screen;

[0017] A controller is connected to the first pressure sensor, the second pressure sensor, and the inlet valve, outlet valve and drain valve of the differential pressure two-stage screen.

[0018] In some embodiments, the opening degree of the tailing valve of the first stage screen is 27%.

[0019] In some embodiments, the feed screen is a feed screen with set pressure differential type slag discharge.

[0020] In some embodiments, the slag discharge port of the feed screen and the slag discharge port of the tailings recovery screen are connected to a ditch.

[0021] Different from the prior art, the above technical scheme, when it is necessary to apply glue to the surface of paper, firstly, the glue in the surface glue storage tank is sent to the feeding screen, the glue in the surface glue storage tank is filtered by the feeding screen, and then the filtered good glue is sent to the storage tank in front of the machine, and then the good glue in the storage tank in front of the machine is sent to a first-stage screen, after the impurities are removed by the first-stage screen, it is pumped to the glue roller of the paper machine to apply glue to the paper surface, and the tailings discharged from the first-stage screen are sent to the tailings recovery screen for filtering and screening, and the good glue is sent to the inlet of the feeding screen, and then sent to the storage tank in front of the machine for recovery after screening by the feeding screen. By adding a tailings recovery screen, the good glue in the tailings discharged from the first-stage screen is recovered, thereby avoiding waste of resources and reducing raw material costs.

[0022] The above-mentioned records related to the content of the utility model are only an overview of the technical solution of the present application. In order to enable ordinary technicians in the field to more clearly understand the technical solution of the present application, and then implement it according to the text of the specification and the contents recorded in the drawings, and to make the above-mentioned purpose and other purposes, features and advantages of the present application easier to understand, the following is an explanation in combination with the specific implementation method and drawings of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and shall not be considered as limitations of the present application.

[0024] In the drawings of the specification:

[0025] Figure 1 A schematic diagram of the structure of the papermaking surface sizing tailings recovery device according to the specific implementation method;

[0026] Figure 2 A schematic diagram of a process flow of a papermaking surface sizing tailings recovery device according to a specific implementation method;

[0027] Figure 3 A structural schematic diagram of a control system of a differential pressure two-stage screen according to a specific implementation method;

[0028] Figure 4 Another structural schematic diagram of the papermaking surface sizing tailings recovery device described in the specific implementation method;

[0029] Figure 5 It is another structural schematic diagram of the papermaking surface sizing tailings recovery device described in the specific implementation method.

[0030] The reference numerals in the above drawings are described as follows:

[0031] 110. Surface glue storage tank,

[0032] 120. Feeding screen,

[0033] 130. Storage tank in front of the machine,

[0034] 140. A sieve,

[0035] 150. Tailings recovery screen;

[0036] 210. a first pressure sensor,

[0037] 220, a second pressure sensor,

[0038] 230. Controller,

[0039] 240. Pressure differential two-stage screen,

[0040] 310, ditch,

[0041] 320. Tailings tank. DETAILED DESCRIPTION

[0042] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0043] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0044] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0045] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0046] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0047] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0048] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0049] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0050] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] See also Figure 1-2 This embodiment provides a papermaking surface sizing tailings recovery device, comprising:

[0052] The surface glue storage tank 110 is used to store glue for papermaking surface sizing;

[0053] A feed screen 120, the inlet of which is connected to the surface glue storage tank 110;

[0054] A front material storage tank 130, wherein the inlet of the front material storage tank 130 is connected to the outlet of the feed screen 120;

[0055] A one-stage screen 140, the feed port of the one-stage screen 140 is connected to the discharge port of the front material storage tank 130, and the discharge port of the one-stage screen 140 is connected to the glue roller of the paper machine; wherein, in order to meet the continuous supply of good glue required for production and ensure that the pressure difference of the one-stage screen 140 is not too large, the opening of the tailing valve of the one-stage screen 140 is set to 27%, so that the one-stage screen 140 can continuously discharge the slag and send it to the tailing recovery screen 150. In this embodiment, three one-stage screens 140 are used, and the three one-stage screens 140 are connected in parallel. In other embodiments, other numbers of one-stage screens can also be used.

[0056] The tailings recovery screen 150 has a feed port connected to the discharge port of the first-stage screen 140 , and a discharge port connected to the inlet of the feed screen 120 .

[0057] When it is necessary to apply glue to the paper surface, the glue in the surface glue storage tank 11 is first fed into the feeding screen 120 through the first feeding pump, and the glue in the surface glue storage tank 110 is filtered by the feeding screen 120, and then the filtered good glue is fed into the front storage tank 130, and then the good glue in the front storage tank 130 is fed into the first stage screen 140 through the second feeding pump, and after the impurities are removed by the first stage screen 140, it is pumped onto the glue roller of the paper machine to apply glue to the paper surface, and the tailings discharged from the first stage screen 140 are fed into the tailings recovery screen 150 for filtering and screening, and the good glue is fed into the inlet of the feeding screen 120, and then sent to the front storage tank 130 for recovery after being screened by the feeding screen 120, and the good glue in the tailings discharged from the first stage screen 140 is recovered by adding the tailings recovery screen 150, so as to avoid waste of resources and reduce raw material costs at the same time.

[0058] In some embodiments, the filtration accuracy of the tailings recovery screen 150 is 300um. The tailings recovery screen 150 has a filtration accuracy of 300um, and the tailings of the first-stage screen 140 are filtered to obtain more high-quality rubber. When the tailings recovery screen 150 with a filtration accuracy of 300um is used for normal operation:

[0059] ① The tailing valve of the first stage screen 140 is opened to 27% and remains unchanged;

[0060] ② The valves of the feed port and the discharge port of the tailings recovery screen 150 with a filtration accuracy of 300um are fully opened during operation, and the tailings enter the tailings recovery screen 150 and are filtered.

[0061] When manual slag discharge is required:

[0062] ① The valves of the feed port and the discharge port of the tailings recovery screen 150 with a filtration accuracy of 300um are all closed, the drain valve at the bottom of the tailings recovery screen 150 is opened, and after cleaning the screen, the filter screen is reinstalled;

[0063] ② Close the tailings recovery screen 150 slag discharge valve, open the outlet valve, then open the inlet valve and continue operation.

[0064] After improving the first-stage rubber tailings treatment process by adding a tailings recovery screen 150, the following calculation is based on the addition of a single set of equipment. The original first-stage screen 140 has a rubber discharge flow rate of 92.6L / min to the ditch, and the solid content of the rubber is 12%. One set saves 2233Kg of raw materials and saves nearly 7,000 yuan / day in costs.

[0065] The glue selected by the first-stage screen 140 still contains good glue in the tailings, which can be recycled. Continuous discharge causes waste. The process improvement plan is to add a tailing glue recovery screen with a filtration accuracy of 300μm behind the first-stage tailing screen. The good glue passes back to the entrance of the feed screen 120 and is recycled in the storage tank 130 before the machine after screening. Because glue is applied on both sides of the paper sheet, two sets of equipment are actually added in the transformation. Because the feed screen 120 adopts a set pressure difference type slag discharge method, there is no need for continuous slag discharge, so there will be no waste.

[0066] In some embodiments, the tailings recovery screen 150 is a differential pressure two-stage screen. The differential pressure two-stage screen is a device for solid-liquid separation, and is commonly used in solid waste treatment and liquid filtration in the industrial field.

[0067] The differential pressure two-stage screen consists of two screen layers, the upper screen has a larger aperture and the lower screen has a smaller aperture. After the liquid passes through the upper screen, it is filtered twice and further solid-liquid separation is performed on the lower screen.

[0068] The working principle of this equipment is to drive the liquid through the screen by applying a pressure difference. Larger solid particles are intercepted on the upper screen, while smaller solid particles can pass through the upper screen and be intercepted on the lower screen. In this way, after the liquid is filtered twice, the separation effect of solid particles is better and impurities can be removed more thoroughly.

[0069] The advantages of differential pressure two-stage screen include:

[0070] 1. Higher solid-liquid separation efficiency: Through continuous filtration of two screen layers, solid particles and liquid can be better separated.

[0071] 2. Lower energy consumption: Compared with other solid-liquid separation equipment, the differential pressure two-stage screen can usually achieve efficient separation effect with lower energy consumption.

[0072] 3. Suitable for various particle sizes: By adjusting the aperture size of the upper and lower screens, it can adapt to the separation of solids of different particle sizes.

[0073] 4. Easy to operate: The equipment structure is relatively simple, easy to operate and maintain.

[0074] By adopting the pressure differential type two-stage screen, the tailings discharged from the first stage screen 140 can be effectively filtered to obtain good glue, wherein the sieve filtering accuracy of the pressure differential type two-stage screen is 70um.

[0075] See also Figure 3 In some embodiments, the use of a pressure differential two-stage screen as the tailings recovery screen 150 can also achieve fully automatic slag discharge. A control system for the pressure differential two-stage screen is also included, and the control system includes:

[0076] A first pressure sensor 210, wherein the first pressure sensor 210 is disposed at a feed port of the differential pressure two-stage screen;

[0077] A second pressure sensor 220, wherein the second pressure sensor 220 is disposed at the discharge port of the differential pressure two-stage screen;

[0078] The controller 230 is connected to the first pressure sensor 210 , the second pressure sensor 220 , and the inlet valve, outlet valve, and drain valve of the differential pressure two-stage screen 240 .

[0079] The pressure of the feed port of the differential pressure type two-stage screen 240 is obtained through the first pressure sensor 210, and the pressure of the discharge port of the differential pressure type two-stage screen 240 is obtained through the second pressure sensor 220. The controller 230 calculates the pressure difference between the feed port and the discharge port of the differential pressure type two-stage screen according to the pressure values ​​collected by the first pressure sensor 210 and the second pressure sensor 220. Then, according to the pressure difference between the feed port and the discharge port of the differential pressure type two-stage screen, fully automatic slag discharge can be achieved. Specifically, when the tailings recovery screen 150 using the differential pressure type two-stage screen is in normal operation:

[0080] ① The tailing valve of the first stage screen 140 is opened to 27% and remains unchanged;

[0081] ② The valves at the inlet and outlet of the differential pressure two-stage screen are fully open during operation, and the tailings enter the screen for filtration. Among them, the valves at the inlet and outlet of the differential pressure two-stage screen are pneumatic valves.

[0082] Automatic slag discharge control:

[0083] ① When the pressure difference between the feed port and the discharge port of the differential pressure type two-stage screen reaches the set pressure difference detected by the first pressure sensor 210 and the second pressure sensor 220, the valves of the feed port and the discharge port of the differential pressure type two-stage screen are all closed, and the bottom slag discharge valve of the differential pressure type two-stage screen is automatically opened, and the differential pressure type two-stage screen is discharged;

[0084] ② After 10 seconds, close the discharge valve of the pressure differential two-stage screen, open the outlet valve, and then open the valves of the feed port and discharge port of the pressure differential two-stage screen to continue running.

[0085] See also Figure 4 In some embodiments, the slag discharge port of the feed screen 120 and the slag recovery screen 150 are connected to the ditch 31. The slag discharge port of the feed screen 120 and the slag recovery screen 150 are connected to the ditch 310, and the tailings generated by the feed screen 120 and the tailings recovery screen 150 are discharged into the ditch 310. Figure 5 In other embodiments, a tailings trough 320 specifically used for placing tailings may also be provided, and the discharge port of the feed screen 120 and the discharge port of the tailings recovery screen 150 may be connected to the tailings trough 320. After the tailings generated by the feed screen 120 and the tailings recovery screen 150 are discharged into the tailings trough 320, the rubber tailings in the tailings trough are uniformly processed.

[0086] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A papermaking surface sizing tailings recovery device, characterized in that: include: Surface glue storage tank, the surface glue storage tank is used to store glue for papermaking surface sizing; A feed screen, the inlet of which is connected to the surface glue storage tank; A front-end material storage tank, the inlet of which is connected to the outlet of the feed screen; A screen of one section, wherein the feed port of the screen of one section is connected to the discharge port of the material storage tank in front of the machine, and the discharge port of the screen of one section is connected to the sizing roller of the paper machine; A tailings recovery screen, wherein the feed port of the tailings recovery screen is connected to the discharge port of the first stage screen, and the discharge port of the tailings recovery screen is connected to the inlet of the feed screen.

2. The papermaking surface sizing tailings recovery device according to claim 1, characterized in that: The filtration accuracy of the tailings recovery screen is 300um.

3. The papermaking surface sizing tailings recovery device according to claim 1, characterized in that: The tailings recovery screen is a pressure differential type two-stage screen.

4. The papermaking surface sizing tailings recovery device according to claim 3, characterized in that: The sieve filtration accuracy of the differential pressure two-stage sieve is 70um.

5. The papermaking surface sizing tailings recovery device according to claim 3, characterized in that: Also includes: A first pressure sensor, wherein the first pressure sensor is arranged at a feed port of the differential pressure type two-stage screen; A second pressure sensor, wherein the second pressure sensor is arranged at the discharge port of the differential pressure type two-stage screen; A controller is connected to the first pressure sensor, the second pressure sensor, and the inlet valve, outlet valve and drain valve of the differential pressure two-stage screen.

6. The papermaking surface sizing tailings recovery device according to claim 1, characterized in that: The opening degree of the tailing valve of the first stage screen is 27%.

7. The papermaking surface sizing tailings recovery device according to claim 1, characterized in that: The feeding screen is a feeding screen with a set pressure difference type slag discharge.

8. The papermaking surface sizing tailings recovery device according to claim 1, characterized in that: The slag discharge port of the feeding screen and the slag discharge port of the tailings recovery screen are connected to the ditch.

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