JPH02501491A - pulp filtration equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] pulp filtration equipment The present invention generally filters fiber suspensions having a consistency of 0.3 to 6%. In particular, wood parts and suitable materials of various sizes and types The present invention relates to a device for filtering paper pulp containing fine particles.

U.S. Patent Application No. 738,743 describes a pulp filtration device that includes a container , a cylindrical screen inside a container, a rotating element volume moving near the screen at a constant speed unfiltered pulp inlet, filtered pulp outlet, and screen inside the vessel There is. The rotating element is rotated from the first bottom surface, the inclined surface and the side surface parallel to the envelope surface of the screen. It has a formed molding surface.

The side surface is approximately perpendicular to the first bottom surface. The slope is 30° to 6cf with respect to the first surface. It forms an angle of . The upper surface is parallel to the first surface. The screen also has grooves There is.

In the papermaking process, pulp is produced through wood processing that breaks down wood into fibers. . Due to the different properties of wood, some types of fibers even from the same wood do not break down and are ejected. Expanded as bundles of fibers, usually referred to as debris, sheep or slivers, that make up the Scatter. There are also other impurities such as park that must be removed.

The screen removes undesirable impurities and debris, called emissions, from the receiving area. I have to separate Bliss. Fibers carried along with debris to the bent part To effectively and selectively remove impurities in order to avoid loss of is required 1゜ Needless to say, other uses have different requirements.

In some applications, for example for paper, long fibers provide strength to the final product. It is necessary to achieve a high content of two-stranded fibers and miscellaneous materials for the purpose, righteousness and hardship. . On the other hand, it is opposed for other uses. For example new or pulp mill fiber In this process, it is desirable to agglomerate long fibers in the effluent for the purpose of purifying the effluent.

In some applications, screens may operate with smoother flow conditions, while others may In some applications it is advantageous to operate the screen in more turbulent conditions.

A pulp filtration device having a screen member and a rotor constituting an annular filtration zone , the material enters the filtration zone from the inlet end and travels along the filtration surface at an angle. The receiving part of the material passes through the filtration surface, and the discharge part of the pulp almost runs along the filtration surface. It travels through a helical path and exits the filtration area at the discharge end. Opening of filtration process Liquids associated with the fiber material pass through the filter surface more easily than the fibers. Therefore, the material Consistency means that the fiber-to-water ratio increases as it moves along the filtration zone. Tendency to develop stingy. If this ratio is too large, , the filtration process is slowed down or even blocked. This slowdown or Adding more water to the material to displace some of the water is not recommended to prevent stagnation. Under normal practice, the water maintains a satisfactory filtration consistency on the inlet side. It passes through the filter surface as shown.

Another method used to maintain filtration consistency on the inlet side is to Deliberately feeding overly diluted material so that excess water passes through the filtration area at the inlet. The goal is to enable continuous filtration.

However, 1. I! The method of adding more water during the passage as well as passing through the trap material first It is preferable to dilute the filter at a high degree as the amount of water added will eliminate the filtration capacity. This will cause negative effects.

Many proposals have been made to solve the above problems. Year 1975, S, E, Device of Swedish Patent No. 374148 patented to E. Ahlfors has a coarse filtration drum and a fine filtration drum, the former surrounding the latter, and comprising a pulse generator and a hole at or immediately behind the pulse generator . This device has drawbacks that prevent it from being easily used in existing housings for retrofitting purposes. , one drum is rotated separately from the other, so two drums are rotated. Because a motor is required, it is extremely expensive.

In 1979 A.D., 5und Defibrator Aktieb Orag was specially developed. The granted Finnish Patent No. 866218 includes a rotating coarse-a passing ram and A filtration device is described which is provided with a finer filtration drum. The former is inhalation Equipped with a feeding device that removes impurities stuck in the fine screen drum openings. It is growing. This proposal, which includes coarse and fine filtration, requires high production costs Only partial success was achieved due to and low general performance. Furthermore, the feed pipe Due to its size and operating conditions, this device may be accommodated in a normal housing for retrofit purposes. It is not easy to use.

The device of Finnish Patent No. 66218 is Tap, published in September 1986 AD. pi Journal page 27 1 and Tappi Proceedings , (1986) Engineering Conference, No. 585 It is also described on pages 587 to 587.

Pulps of different consistencies require screens of different outside diameters.

Pulp suspensions with different external shapes have different physical properties for different applications Requires.

The purpose of the present invention is to improve the efficiency and selectivity of separating long fibers into ribs and debris. Ru.

Another purpose is a filtration device that works in smooth flow as well as in more turbulent conditions. It's about getting.

Yet another purpose is to filter the amount of filtration without adding water or first diluted excessively. The goal is to maintain the required filtration efficiency without using materials.

Yet another objective is to provide pulp feed consistency from 0.3% to 6% Working vine 2+! The goal is to obtain the correct equipment.

Yet another purpose is to use screens of various shapes for various pulp suspensions. can be used to generate the necessary feeding effect for low consistency suspensions. , and to obtain a rotor that generates the necessary turbulence for high consistency materials. It's there.

To achieve the above purpose, the filtration device using the present invention can introduce fibrous material inside. an inlet configured to receive and remove filtered material from the housing; an outlet configured to drain, a housing having an exhaust outlet; The forming screen moves at a predetermined speed near the screen and forms an annular filter along with the screen. a rotor forming a chamber, at least one rotor on the side facing the screen; The filtration chamber has a partially shaped surface with a number of protrusions along a portion of the length of the filtration chamber. It is constructed with a plurality of holes to allow the introduction of fibrous material into the filtration chamber, and the material is preferably This prevents unwanted debris from entering the room.

Other objects and features of the present invention will become apparent from the following description based on the drawings. It will be.

FIG. 1 is a partially cutaway side view of a filtration device according to the invention.

FIG. 2 shows a filtration according to the invention in which the rotor is located on the inlet side of the screen. An example of the device is shown. The rotor is always placed on the entrance side of the screen, The device can function as an outflow or inflow type.

In the outflow type shown in Figure 2, the pulp flows from the inside of the screen to the outside. The molding surface is on the inside of the screen.

3, 4, 5, 6, 7 and 8 show rotors according to the present invention and Screen plates that can be used together are shown.

FIG. 9 shows a device configured as an inflow type.

In the apparatus shown in Figure 9, the pulp flows from the outside of the screen to the inside to form the screen. The shape of the screen is the outer side of the screen 1, the cylindrical screen 3 provided inside the housing, It has a rotor 4 mounted within a shaft 5. The housing holds the unfiltered pulp suspension. An inlet 6, which makes it possible to introduce the upper part of the housing into the chamber 7, receives (filtration) outlet 8 for the material (discharged), a discharge chamber 19 and an outlet 9 for the material to be discharged at the lower end has. A filter chamber 12 is formed between the cylindrical screen and the rotor. sign No. 15 indicates the reception room.

Reference numeral 2 indicates a removable cover of the housing, and reference numeral 11 indicates a cover that closes the upper end of the filtration chamber. This shows the board. The upper end of the cylindrical screen securing the screen member to the structure 10 It constitutes a partition wall between the first chamber 7 at the upper part of the cage and the second chamber 15 which is a receiving chamber. Uke A chamber 15 is formed between the vertical wall 16 of the housing and the cylindrical screen, and a second The chamber surrounds a cylindrical screen. The housing has an additional structure 17, the structure 17 forms a partition wall between the second chamber and the third chamber 19 together with the flange 18, and the third chamber 19 is a discharge chamber at the bottom of the housing. Material population 6 directly communicates with the first chamber, The storage chamber 8 directly communicates with the sixth chamber.

an axial bar or vane 20 extending substantially along at least a portion of the rotor length; is mounted on a support adjacent the inner surface of the rotor. The plate 21 covers the lower end of the rotor. It's closed. The opening 22 at the lower end of the rotor drum 23 is connected to the internal space of the rotor and the discharge chamber. It communicates between.

The screen plate 3 has a molded surface. In one embodiment shown in FIG. The lean plate has a groove 24 on the inlet face. Also, the inside and outside of the rotor have grooves 25.2. 6, but the rotor has only one molded surface facing the screen. do not have. The molding surface does not need to be continuous.

The rotor screen gutter 25 is formed with a bottom surface 27 and two side surfaces 28,29. ing. The rotor inlet groove 26 is likewise located on the bottom surface 30 and on the two side surfaces 31.32. Therefore, it is formed.

The bottom surface 27.30 is generally perpendicular to the side surfaces 32.29. Side 28.31 is cylindrical The entire shape is inclined with respect to the inner and outer surfaces. Angle α is between the upper surface 33 and the inclined surface 28 In this embodiment, the angle is between da and 60°. . Angle β is envelope 3 4 and the side surface 31 and lies between 10° and 6cf'.

The symbol H1 indicates the distance between the bottom surface 27 and the top surface 33 of the rotor outer surface, which is 16 inches. (1,58F11) and 2 inches (50,8+i+). The code H2 is the bottom The distance between the surface 30 and the envelope surface 34 on the rotor inlet side is shown.

It lies between inches (1,58m+m) and 2 inches (50,8 positive). Code B1 and B2 indicate the width of the bottom surface 27.30 of the outer and inner surfaces of the rotor, respectively, /B (3,17iiJ and 2 inches (50,8n).

The rotor 23 extends along a portion of its axial length starting from its upper end, L) in FIG. the fiber material can pass through the rotor but is larger than the inlet opening 36 of the hole. It has a plurality of holes 35 sized to prevent foreign matter from entering the filtration zone 12. of the hole The inlet opening is installed at the bottom of the rotor inlet side groove 26, and the discharge opening 37 is installed at the rotor outlet side. installed on top.

The bore of the rotor is cylindrical or preferably grooved in cross-section. The outlet opening of the hole is the inlet opening. It is preferable to have a large mouth.

The grooves and holes in the rotor are larger than the grooves and holes in the screen in the embodiment of FIG. Sorry, but this isn't necessary. The rotor can also consist of molded bars - The bars form a vertical opening between them when assembled; forms the bore of the rotor.

The forming bar is indicated by a dotted line drawn through the rotor opening as shown in Figure 2. It is.

The inclined side surfaces of both sides of the rotor are arranged such that the inclined side surfaces of the rotor are Either the distal lateral or the posterior lateral.

The rotor is rotated in different directions, i.e. clockwise for high efficiency as shown in Figure 2. and also rotate counterclockwise to achieve high capacity.

The grooves 25 and 26 are installed relative to each other as shown in FIG. Come to the flow side. However, one or both of the grooves 25.26 Any second groove can be formed so that it is on the downstream side of the groove. It is also possible to form the groove so that it has an inclined surface on the flow side and a vertical surface on the other side. group The grooves forming the group have an inclined surface on the downstream side, and the next group of grooves has a vertical surface. You can also

In the outflow operation of FIGS. 1 and 2, the pulp suspension passes through the inlet 6 to the top of the device. It is supplied to the first chamber T and flows into the rotor 4. The fibrous material is filtered through the holes of the rotor Particles that flow into the member and are larger than the holes cannot pass through the holes in the rotor. large rotor break The area allows heavy foreign objects to be ejected through the opening 22 in the lower end of the rotor, and Allows the pulp suspension to flow through the inner surface of the rotor almost in the raw direction . Most of the rotation is prevented by the rotor's rotation groove surface and the axial flow prevention member 22. The interaction with the suspended pulp suspension produces strong pulses and turbulence. , they prevent a mat of fibers from forming in the openings of the grooves 26. groove surface pulses and turbulence by adjusting the position and inclination of the flow prevention member relative to the The strength of the current can be changed. If desired, allow dilution water to flow through the blocking member. It is also possible to direct the flow toward the groove surface at the bottom of the rotor.

The material entering the filtration chamber is subjected to circumferential movement by the rotor, and is almost trapped in the grooves on the screen surface. Produces strong pulses and turbulence when flowing vertically. Groove direction and screen plate The angle with the axis of the cylinder is 4 da. The fibers are accepted through the holes in the screen. through outlet 8 into the chamber 15 surrounding the screen and as an acceptable material. removed. Material that does not pass through the rotor holes or screen is removed from the housing. It is collected in chamber 19 at the lower end and discharged through outlet 9 as waste.

The filtration chamber 12 between the rotor and the screen is approximately 1 inch for the narrow one and 6' for the wide one. It is about 50rnx.

When the screen chamber is narrow, the 111Ill or 3=] door should be aligned with the groove surface of the rotor. An effective hydraulic action is achieved with the screen facing the filter, providing favorable conditions for filtration. Ru. In addition, the screen can effectively process high consistency materials up to 6+%. It becomes possible to do.

In the embodiment of FIGS. 3 and 4, the screen groove has a bottom surface 40; are the envelope surface 42 of the screen surface, the upstream side surface 44 and the lower side when viewed from the bottom of the groove. It is approximately parallel to the flow surface 45. In Figure 3, the envelope surface of the screen surface and the upstream side the angle α between the surface 45, i.e., tangent to the envelope surface of the screen surface close to this side surface The angle between the plane and this side is approximately 9 (f), the envelope of the screen surface and the downstream The angle β with the side surface 45 is equal to or less than 6rf. In Figure 4, the angle α is to 60°, and the angle β is 9aQ. The holes in the screen plate are at the bottom of the groove 40. It is set in.

In the embodiment shown in FIG. 5, the groove 52 is U-shaped and the sides 44, 45 are screened. Almost perpendicular to the envelope of the surface.

In the embodiment of FIG. 6, the screen surface is wavy and the sides 44, 45 of the groove are is inclined with respect to the envelope surface of the curved surface.

The rotor surface that does not face the screen does not need to be grooved; the entire rotor surface should be grooved. It is not necessary to do so.

The inlet side of the rotor may also be a molded surface, for example as shown in Figures 3-8. I can do it.

Typical filtration device with a cylindrical rotor of (9,5α) bottom width (Bl and B 2) %6 xn (4,76mx) angle [α and β] 50° Width of axial groove 36　/16　ln　(1-58lIm　) Circumferential interval of groove, That is, the distance between the continuous grooves 26 is 0.5 sn (12,7 aow) Width of screen room (W)’ict in (4,76m) Example of Fig. 7 In the screen, the groove has two sides, a bottom surface and a top surface, and a negative side. The face is perpendicular to the envelope of the screen, and the other sides are convex or concave to the envelope. It's curved.

In FIG. 8, the side surfaces of the groove are inverted V-shaped.

Although Figures 1 and 2 are intended to be of the outflow type, the device shown in Figure 9 can easily be adapted to the inflow type. Applicable, according to which the pulp is fed to the outer surface of the rotor and passes through the holes to the inner surface. and flows into the screen room. After that, the receiving part has a fine screen. It enters the receiving chamber through the hole, and the remaining discharge part of the screen chamber goes to the discharge chamber. and move. This effect is particularly advantageous when removing large dirt-type particles.

Another advantage of the device according to the invention is that it can be retrofitted into a normal screen , you can use it and get great cost savings.

IG 1 FIG.3 FJ (3,7a FIG, 7b FJ6.8 Mortar 6.9 Submission of translation of written amendment

Claims (1)

[Claims] 1. Inlet configured to introduce fibrous material into the interior, filtered fibrous material a first outlet configured for removal therefrom; a second outlet for waste; a screen having a molded surface within the housing, a screen having a molded surface in the vicinity of the screen; a rotor moving at a predetermined speed and forming an annular filtration chamber with the screen; and the rotor has a surface facing an at least partially shaped screen. a plurality of holes along at least a portion of the length of the filtration chamber; The material is configured such that it can be introduced into the chamber to prevent undesirable debris from entering said chamber. A pulp filtration device that prevents 2. The molded surface of the rotor has a groove, and the rotor has an inlet side and an outlet side. 2. The apparatus of claim 1, wherein both sides of the rotor are grooved. 5. The molded surface of the rotor has a groove, the groove has a bottom surface and two side surfaces, and the groove has a bottom surface and two side surfaces. one side is inclined and the other side is perpendicular to the bottom surface, said inclined surface being 5 degrees away from the bottom surface. 2. The device of claim 1, wherein the angle is 60°. 4. The molded surface of the rotor has a groove, and the groove has a top surface, a bottom surface and two side surfaces. one side surface is inclined and the other side surface is perpendicular to the bottom surface, and the inclined surface is 6. A device according to claim 5, which forms an angle of between .degree. and 60.degree. 5. The rotor groove has an upstream side and a downstream side, and the downstream side of the rotor groove has a rotor groove. 6. The apparatus of claim 5, wherein the upstream side surface is inclined relative to the rotor surface and is substantially perpendicular to the rotor surface. 6. The rotor groove has an upstream side and a downstream side, and the downstream side of the rotor groove has a bottom side. 4. The apparatus of claim 3, wherein the upstream side surface is inclined to the rotor plane. . 7. The rotor has grooves on both sides, the hole has an inlet, and the inlet of the hole is connected to the rotor inlet groove. 3. The device of claim 2, wherein the device is provided at the bottom of a. 8. 6. The hole has an outlet, and the outlet is provided on an inclined surface of the rotor outlet gutter. equipment. 9. 6. The apparatus of claim 5, wherein the hole has an outlet provided on the top surface of the rotor outlet gutter. . 10. 6. The apparatus of claim 5, wherein the hole has an outlet provided at the bottom of the rotor outlet gutter. Place. 11. 2. The apparatus of claim 1, wherein the rotor is located within a screen. 12. 2. The apparatus of claim 1, wherein the inner surface of the rotor faces the outer surface of the screen. 13. 2. The apparatus of claim 1, wherein the rotor is cylindrical. 14. The apparatus of claim 1, wherein the rotor is non-cylindrical. 15. 2. The apparatus of claim 1, wherein the rotor bore is cylindrical. 16. 2. The apparatus of claim 1, wherein the rotor bore is non-cylindrical. 17. The forming surface of the screen has grooves with holes, and the grooves and the holes of the rotor are 3. The apparatus of claim 2, wherein the grooves and holes are larger than the lean grooves and holes. 18. The screen is a cylindrical screen plate with grooves provided with holes, the holes are at the bottom. , the bottom of the groove is parallel to the envelope plane, and the groove has two sides, with one side of the groove One side is almost perpendicular to the envelope of the screen surface, and the other side is inclined to the envelope. 2. The apparatus of claim 1. 19. The screen plate has a groove on the concave inlet side of the filtration surface, and the screen plate has a groove on the inlet side of the filter surface. The groove has an upstream side, a downstream side, and a bottom side when viewed from the bottom of the groove. The bottom surface is approximately parallel to the envelope surface of the screen plate, and the groove has holes in the bottom surface. The upstream side of the groove is perpendicular to the envelope surface, and the downstream side of the groove is perpendicular to the envelope surface. 19. A device according to claim 18, wherein the angle is between 60[deg.] and 5[deg.]. 20. The screen plate, the downstream side surface and the upstream side surface are flat approximately parallel to the envelope surface. 20. Device according to claim 19, connected to each other by surfaces. 21. The screen has an inlet face and an outlet face, and the rotor has an inlet face and an outlet face. Claim 11: The molding surface of the screen is located on the inside of the screen. The device described. 22. The screen has an inlet side and an outlet side, and the rotor is on the inside of the screen. 13. The molding surface of the screen is provided on the outside of the screen. equipment. 23. The downstream side of the screen is almost perpendicular to the envelope surface of the screen surface, and the upstream side is inclined. 19. The apparatus of claim 18. 24. The molding surface of the screen has a groove, and both sides of the groove are approximately on the envelope surface of the screen. 2. The device of claim 1, which is vertical. 25. The screen is a cylindrical screen plate with grooves, and the holes are at the bottom of the grooves. , the bottom surface of the groove is parallel to the envelope surface, the groove has two surfaces and a top surface, and one side of the groove One side is approximately perpendicular to the envelope surface of the screen and the other side is curved relative to said envelope surface. 2. The device of claim 1, wherein the device is curved. 26. 26. The device of claim 25, wherein the side surface is convex or concave with respect to the envelope surface. 27. The screen is wavy, and the screen has grooves, and both sides of the grooves are opposite to the envelope surface. 2. The device of claim 1, wherein the device is tilted. 28. 2. The molded surface of the rotor is formed by separate molded bars. equipment.