JPS5980309A - Rotary furnace - 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 The present invention is a four-rotation filter, which is a one-rotation filter for separating fibers from a fiber suspension, and has a plurality of filter disks each consisting of a collection of filter elements. The discs are substantially parallel and axially spaced, and are located in a container of the fiber suspension to be separated, and are supported on bearings and rotated by a motor. Mounted on a horizontal drum, each filtration element consists of a hollow housing with walls made of P cloth, through which the ilj liquid outlet closest to its center of rotation The drum is connected to the axial discharge pipe of the drum, and the portion corresponding to the cylindrical surface of this drum is grating-formed.
) It consists of IC-lined axial tubes, these axial tubes are actually the discharge tubes that communicate with the filtration element, and are inserted into the drum from one open end of the drum. The internal pressure of each filter element is individually maintained at least the above. During one section of one revolution of the drum, the pressure is maintained lower than the pressure on the outside.

Regarding a 5-turn filter.

This kind of filtration machine has Swedish patent number 7406315.
It is known from the specification No.-7. The rotary filter known from this patent is an improvement compared to previously known designs. By locating a case collection hopper in the drum that receives the separated fiber mass, the height of the liquid level in the filtration-like vessel can be made higher than previously possible, thus increasing the filtration surface. The advantage was that it was more accessible. Because the cake collection hopper is located in the drum rather than between the rover discs, its moving parts operate completely free from wear, thus extending its service life.

Additionally, the distance between the overlapping disks can be shortened. When it comes to hidden disks of a certain capacity, their space requirements are significantly reduced. However, this type of rotary filter has thirteen drawbacks. The required filtration area for a given separation capacity remained relatively large.

Furthermore, due to the necessity of having a sufficiently large opening in the center of the rotating drum as a passage to the collection hopper for the separated fiber cake, the axial discharge pipe in the drum is substantially rectangular in cross section and vertically It was necessary to create a design in which the directional symmetry axis overlapped with the radius of the rotating drum. Because the discharge pipe is subject to varying loads, such a design requires a relatively thick wall thickness, resulting in a high weight. Also, the production cost is very high.

It is an object of the invention to provide a rotary filter of the type mentioned at the outset, but with a substantially greater capacity per unit of filtration area, better safety of operation and a greater proportion of solids in the separated fibers. The objective is to provide products that are lighter in weight and cheaper to produce.

Such a disc-type filter according to the invention is characterized in that the axial tubes mentioned above are arranged in groups of at least two when viewed in cross section. With such a design, for a given filtration area, the opening leading to the center of the filtration machine can be made larger, ie, the separated fibers can pass through more freely, so that the capacity can be increased. Thus, such disc filters can be operated at substantially higher rotational speeds than previously possible. In fact, it can double the speed, which means a 40% increase in capacity. In short, the size of the opening is determined by the spacing between the axial discharge pipes, which determines the possible rotational speed.

According to the invention, a disc filter of the type mentioned at the outset is made substantially cheaper, since a standard cross-section for the axial discharge tube, namely a circular cross-section, can be used in suitable embodiments. Manufacture vines.

Thus, the weight of this disc filter is substantially reduced compared to conventional designs.

Other cross-sectional shapes of the axial tubes can also be used in the application of the invention, for example square cross-sections. in this case,
The tubes are suitably combined together, which has the advantage of making the openings between the groups of axial discharge tubes even larger.

The tubes can also be made as one piece with a common septum and a shape other than square in cross section. This structure is particularly suitable in one embodiment in which the tubes are arranged in cross-section at substantially the same distance from the center of the drum.

In one embodiment of the disc filter according to the invention, one filtering element is arranged in one axial tube behind or at the rear end of this filtering element when viewed in the direction of rotation. while the filtration elements following it communicate with other axial tubes grouped with the tubes mentioned above.

In one suitable embodiment of the disc filter according to the invention, said tubes in a group have their central axis (
The axes of symmetry) are aligned on or near one radius passing through the center of the rotating drum in the cross section, and are arranged at different distances from the center of rotation.

In one suitable variant of this embodiment, the tubes closer to the center of the rotating drum are placed in a position further circumferentially in the direction of rotation of the rotating drum than the tubes further from the center. This embodiment provides suitable conditions for the passage of the fiber cake separated from the filter element to the collecting hopper.

To make this path easier to navigate, guide plates can be arranged on the front and rear sides of the tube in the axial direction, but on the front and rear sides when viewed in the direction of rotation of the rotating drum. It would also be a good idea to make the tube and guide plate as one unit.

It is often appropriate to arrange this guide plate in such a way that it extends radially beyond the axial tube, preferably as far as occupying part of the span of the filter element.

There are various ways to facilitate cake removal from the surface of the filter element, depending on the type of fibers present. Conventionally, the fiber cake is removed by spraying pressurized water or compressed air in the so-called cake-breaking zone, i.e. in the zone above the cake collection hopper, where there is no negative pressure inside the cake (adhering surface). was taken. However, some fibers are easily dehydrated and produce a thick pulp cake on the filter element. These pulp cakes can be difficult to remove and require special equipment. In one or three suitable embodiments of the filter according to the invention, in the decaking zone a certain amount of positive pressure is provided on a portion of the inside of the dewatered fiber cake, thereby causing the detachment of the fiber cake. The device can be designed so that gravity initiates and then completes the disengagement. In order to further facilitate disengagement, the filter element can be tilted towards the outside when viewed in longitudinal section, at least in part of the circumference. Connecting pipes can be arranged around the circumference of the filter element such that on one side they open to the filter surface below the cake and on the other hand they are connected to a pressurized liquid or gas pipe. The opening of the connecting tube at the filter surface must be designed so that the fiber cake bridges over it. That is, the openings must be narrow and long.

The above connecting pipe is connected to one section of one rotation of the rotating drum.
It is thus particularly suitable to arrange it in such a way that it is connected to a stationary nozzle for supplying pressure or gas or liquid in the case removal zone. The use of such a device to assist in decaking the fibers reduces the amount of water required, if water is used, and thus increases the solids content of the separated fiber mass. When compressed gas is used, which is usually compressed air, the gas flow requirements are reduced and costs are reduced.

The present invention will be explained in more detail below with reference to the drawings.

In FIG. 1, 1 is a container for a fiber suspension, and 2 is a filtration rotor with a horizontal axis, a part of which is inserted into the container 1 and rotates.

The filter rotor 2 has several annular filter discs 3,
The disks are mounted on a substantially parallel and horizontal drum-4, which is connected to a drive motor. The filtration disc 3 consists of several individual filtration elements 5, each of which consists of a hollow casing with walls of woven cloth, which is connected to the shaft via the P-liquid outlet at the end closest to the center of rotation. It is connected to the discharge pipe 6 in the direction. In FIG. 4, the filter element 51 communicates with the axial discharge pipe 64 via a branch pipe 7', and the filter element 52 communicates with the axial discharge pipe 64 via a branch pipe 72.
It shows in detail how the person is being contacted.

The drum 4 is thus composed of an axial pipe 6 and a branch pipe 7. 15.17.1 instead of using these branches
It is also possible to incorporate (axial) tubes into the filter element as shown in FIG.

The details of the coupling with the drive motor are not shown, but are of well known technology.

A collecting hopper 8 is inserted into the drum 40 from one open end thereof, and its upwardly directed opening 9 extends over the entire number of filter discs mounted on the drum. The filter rotor 2 rotates in the direction indicated by the arrow IO in FIG. For optimal operation of the rotary filter according to the invention, it is necessary that during one section of one rotation there is a negative pressure inside the fugitive element, which is outside the fugitive element 5 below the liquid level. It must be such that it adds to the hydraulic pressure acting on it.

This negative pressure can be applied by a vacuum pump or by exhaust pipe 1: (
4. Obtained by designing it like a so-called siphon tube.

As the fugitive element 5 rotates and reaches the drop-off zone, communication between the vacuum source and the interior of the fugitive element 5 is established by a locking mechanism (1).
ock device ) l 2 and the interior of the filter element is instead in communication with the atmosphere, breaking the vacuum and allowing the fiber cake to break away.

A conveying screw 14 that is supported by a bearing and rotates is installed in the collecting hopper 8 in order to take out the fiber lumps that fall into the hopper 8.

As shown particularly clearly in FIGS. 4, 5 and 8, the axial discharge pipes 6 are arranged in groups of at least two when viewed in cross section. has been done. In the embodiment of FIGS. 4 and 5, the central axes of each of these tubes are in the vicinity of one radius through the center of the rotating drum 4, and their distances from the drum center are different. . In the case of FIG. 8, the tubes are at substantially equal radial distances from the drum center.

In the embodiment shown in FIGS. 4 and 5, the rotating drum 4
The tubes closer to the center (e.g., 62 and 64) are more likely to have
It is placed at a position on the circumference of the rotating drum in the direction of rotation. In FIGS. 4 and 5 the tubes are of circular cross-section, whereas in FIGS. 6 and 7 they are square.

In order to facilitate the passage of the fiber mass separated from the transitive element, in the case of FIG.
e) 15.16 and 17.18 are provided respectively. In the case of Figure 4, this corresponds to the following.

Guide plates provided on tubes 6', 62 and 63, 64, respectively] 5', 16', and 17', 18'. Often such guide plates are located on the front side of the tube, when viewed in the direction of rotation Q. It is sufficient to provide it only on the front side.

If the tube is rectangular as shown in Figures 6 and 7.

Since the walls of the tube form a large part of the guide plate.

In extending the guide plate radially beyond the axial tube and creating a snag-free passage for the fiber mass, the small sections indicated at 19.20 and 21.22 in these figures are All you have to do is add it. The guide plates 15, 16, 17, 18 in FIG. 5 extend further in the radial direction and occupy up to a portion of the radial span of the filter element 5, as seen in the figure, and thus Good passage of the mass is ensured.

In the design shown in FIG. 8, tubes 616, 617 and 161
8, 161T+ are approximately equal radial distances from the drum center. The tubes still share one bulkhead and are a single unit. Figures 10 and 11 show other examples of tube deformation, but in these cases too the tubes are at approximately equal radial distances from the center of the drum.

One further modification is shown in FIG.

This variant differs from the one described above because, in every other filter element, the axial tubes with which they communicate are It is located at the front or at its front end. The other transitive element communicates with an axial tube located after the filtering element or at its rear end, when viewed in the same plane and direction as above. These two types of axial tubes are arranged in groups of two.

For best performance, the wall of the rotationally trailing edge of the filtration element should be axially You have to lean towards the tube.

That is, as the rotation progresses (reverse tilt etc.) the tilt must change to horizontal.

What is schematically shown in FIGS. 1 and 18 is a combination of the main embodiment of FIG. 4 and the embodiment of FIG. 15. As is clear from the figure, there are three axial tube trees in one group, one for every three: ρ filter element 18', in front of the filter element or at its front end when viewed in the direction of rotation. It is connected in the axial direction in the part. Other filtration elements communicate with an axial mist located after or at the rear end of the filtration element. These three types of axial tubes are arranged in groups of three. Although in the figure these tubes are at different radial distances from the center of rotation, it is also possible to arrange these tubes side by side on the circumference at equal radial shortness Pi#, VC from the center of rotation. It is possible.

In FIG. 16, the path of the JP liquid from the filter element, i.e. via the axial tube; The route leading to the liquid discharge device is schematically shown.

FIG. 17 schematically shows the path of the P liquid in the case of the crotch pull shown in FIG. 15.

Although the path of the rrj liquid is shown in the same way in FIG. 18, this is a combination of the embodiments shown in FIGS. 16 and 17.

In the case of FIG. 16, it is clear that the outlet corresponding to the axial tube of each filter element is located at the same angle rearwardly relative to the center of gravity of the filter surface.

This means that liquid can be completely drained from the ifiltration element, almost regardless of the shape of the iFJ element.

In contrast to the embodiments of FIGS. 15 and 17, the filtration element must be designed so that the slope of the wall of the trailing edge does not result in pockets from which the liquid cannot drain. No. This is particularly necessary even if the filter element is disconnected from the vacuum source.

Certain easily dehydrated fiber suspensions are il, −+
It produces a very thick pulp cake that is not easily separated from the overlying elements.

In Figures 12, 13 and 14, a few devices are shown at the circumference of the 7-inch filter element 5 to facilitate the removal of the fiber mass from the filter element. 12th
In the embodiment shown in the figure.

i) =: The walls 23 on both sides of the over-element 50 are connected to the intermediate wall 2;
, where wall 23 is joined by intermediate wall 2
It extends to the outside a little more than 4. Nozzle device 2
5 is arranged towards the inner WI of the extension of the wall 23 in the section of one revolution of the rotating tram 4 in which the fiber mass is to be dropped, i.e. in the cake dropping zone;
It is arranged in such a way that by supplying gas or liquid through this nozzle, a mass of fibers breaks off at its outer periphery and draws on other parts of the fiber cake.

Connecting pipes 27 opening into the filter surfaces 29 of the walls on both sides of the filter element
．． 28 and a pipe arrangement 26 which replaces the nozzle described above;
can also be provided in the same arrangement as in the case of the nozzle described above (FIG. 13).

In another embodiment, the connecting tube 31 opens into the filtering surface, but in this case at the 5th circumference, into the connecting intermediate wall, an outwardly curved wall (in longitudinal section), which is joined by the wall 4;
, 32 and branched into two in a hanging manner.
is provided.

The advantage of outwardly curved walls is that such a design makes detachment of the fiber cake easier (FIG. 14).

In Fig. 5, Fig. 12, Fig. 13 or Fig. 14
The illustrated device shows two embodiments in which a special element 6 is integrated into the interior of the filtration element.

The function of this rotary filter sakaki will become clear from the above explanation.

The fiber suspension is supplied from the inlet 35, and the fiber 1 (agglomerates)
They accumulate on the surface of the filter elements while they are immersed below the liquid level 11 in the container 1. The J1 liquid is continuously discharged through the outlet pipe 13. In the upper half, i.e. in the cake drop zone, there is no negative pressure (in the filter element) and the fiber cake is removed, as the case may be, as shown in FIG.
With the aid of the apparatus shown in FIGS. 13 and 14, the dewatered fiber mass falls into the collecting hopper 8 of the case and is discharged.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a rotary filtration system according to the present invention, and h is a cross section taken along line I-1 in FIG. 3. Figure 2 is an expanded cross-section taken along II-U in Figure 1.
FIG. 3 is a sectional view taken along line III-III in FIG. 1, and FIG. 4 is a sectional view taken along line IV-IV K in FIG. 1.
This is an enlarged view of the part shown in Figure 3. FIG. 5 is a sectional view of another embodiment of the part shown in FIG. 4 in the filter; FIGS. 6 and 7 are axial discharges with guide plates (in FIGS. 4 and 5); 8 is a cross-sectional view of an alternative embodiment of the portion shown in FIG. 4 in the filter; FIG. 9 is a cross-sectional view of an alternative embodiment of the tube shown in FIG.
10 and 11 are cross-sectional views of an alternative embodiment of the axial discharge tube with a common partition; FIGS. 11, 12 and 13 are cross-sectional views of the FIG. 15 is a sectional view of a further embodiment of the part shown in FIG. 4 in the filter, FIG. Figures 1 and 18 are schematic partial cross-sectional views of a portion of the P pan iso, including the I filtration element, the axial tube and the P liquid outlet. 1... Container 2... Filtration rotor 3.
・・・・Rotating disk 4・・・・Rotating drum 5・
...filtration element 6 ... axial pipe for discharging P liquid 7 ... branch pipe for discharging P liquid 8 ... cake collecting hopper 9 ... ...Cake collecting hopper opening 10...
...Pif rotor rotation direction 11 ... liquid level in container] 2 ... vacuum lock mechanism l: ... P liquid discharge pipe (negative pressure) 14 ...・
・Transportation screws 15.16, 17.18... Cake falling guide plate (circular section pipe top pick up)]! + , 2 (1, 21, 22...Cake falling guide plate (mounted on rectangular section pipe) 23...-711 passing wall surface 2 =1...; Filter wall connection intermediate wall 25. ... Nozzle device for removing cake 26 ... Pipe device for removing cake 27.28 ... Connecting pipe for removing cake 2q ...
・;Filtering wall surface: 30... Pipe device for cake removal 3], 32... Connecting pipe for cake removal, 3,
3... Slanted part of filter wall surface; 35... Fiber suspension inlet 36... Connecting element (for removing cake) 37...
...Filtering element 38...Filtering element 39...Axial tube for draining slush liquid Patent applicant
Actuie Boraget Shieleko Fig, 18 Procedural amendment November 14, 1980 Director General of the Patent Office ■, Small case indication 1982 Patent Application No. 149701 2, Name of invention rotation f case 3, Person making amendment case Relationship with Applicant Akutsuiebo Larget Shereko 4, Agent 1 Factory 5-9-20 Akasaka I-chome, Minato-ku, Tokyo, Procedures for drawings subject to amendment Amendment (method) % formula % ■, Small case indication 1981 Patent Application No. 1497t
Jl No. 2, name of the invention Rotary filter 3, relationship with the amended case Applicant Akso Eborage Soton Ereko 4, agent address 8th floor, Kowa Building 16, 1-9-20 Akasaka, Minato-ku, Tokyo , . Name Patent attorney (7021) Tadashi Wakabayashi 1 Telephone (585) 1882 5 Date of amendment order 6 "Brief explanation of drawings" column of the specification subject to amendment. 7. Change "Figures 11, 12, and 13" in lines 6 to 7 of page 24 of the specification of the contents of the amendment to "Figures 12, 13, and 14.
Correct it to "Fig."

Claims (1)

[Claims] (1) A rotary filtration machine for separating fibers from a fiber suspension, comprising a plurality of filtration disks each consisting of a collection of filtration elements, the disks being substantially parallel. At axial intervals, the fibers to be separated are mounted on a horizontal drum supported in bearings and rotated by a motor in a single container of the suspension. , each filtration element consists of an empty housing with a wall made of sawn cloth, and the housing is connected in the axial direction of the drum via the r-liquid outlet located closest to the center of rotation. This drum is connected to the discharge pipe, and the part corresponding to the cylindrical surface of this drum is made up of axial pipes lined up in the form of a grate nog, and these (3) axial pipes actually communicate with the filter element. (4) A collection of cakes inserted into the drum from one open end of the drum. extending over the entire number of filtration disks, the internal pressure of each filtration element is individually maintained at a lower pressure than the pressure outside of it for at least one section of one revolution of the drum, so that the fiber suspension is In a rotary filtration system for separating fibers from a filtration system, the axial pipes (6) are arranged in groups of at least two on a cross section; -0 The central axes of each tube (6) are aligned on one radius passing through the center of the rotating drum (1), or are in the vicinity of one radius, and their distances from the center are different. The rotary filter according to claim 1, characterized in that the axial tube (6) has a circular cross section. (The rotary filtration machine according to item 2. The tubes (72, 64) closer to the center of the rotating drum (4) are located on the circumference in the direction of rotation of the drum than the tubes (6', 63) farther from the center. A rotary filter according to any one of claims 1 to 3, characterized in that the rotary filter is located in the direction of the drum. (4) A rotary filter according to claim 1, characterized in that the filter element (37) is located at substantially the same distance from the center of rotation of the drum (4). After the filter element (37) as seen in the direction of rotation of the
connected to the axial tube (624) at the rear end, while connected after the above-mentioned i)1 pass-element (37), viewed in the direction of rotation of the drum (4); f1 pass-element; (38) communicates with an axial tube (625) which is arranged integrally with the axial tube (624). Rotating J filter machine described in Crab. (7) Axial tube (616, 61";62"e23)
Claim 1, characterized in that, when viewed in cross-section, they share at least one partition wall;
The rotary filter according to any one of Items 2, 4, 5, and 6. (8) The guide plates (15-18) are connected to the rotating drum (4)
The rotary filter according to any one of claims 1 to 7, characterized in that the rotary filter is provided at the tip of the tube (6) in at least the axial direction when viewed in the rotation direction of the rotary filter. . (9) The guide plate (i5-18) is connected to the axial tube (6
) The rotary filter according to claim 8, wherein the rotary filter extends slightly more radially toward the row side. 00) The guide plate (15 to 18) is connected to the filter element (5
) extends in the radial direction to occupy at least a part of the radial span of the
The rotary filtration machine described in section. 01) The surface of the filter element (5) is at least 1 part of its circumference
The rotation according to any one of claims 1 to 10, characterized in that the portion (33) is bent outward in the longitudinal section 1H; (12177' There are connecting pipes (27, 28; 31, 32) that open to the filtering surface on the circumference of the filter element (5), and these connecting pipes are connected to pressurized liquid or gas pipes (26, 34).
12. The rotating filter according to claim 1, wherein the rotary filter is K-connected. (I3) The communication pipes (27, 28; 31, 32) supply liquid or gas under pressure in one section of one revolution of the rotating drum (4), that is, in the so-called kerating zone. Rotary filter according to claim 12, characterized in that it is arranged in communication with stationary nozzles (26, 34). 04) Wall surface forming a pair of iF' over elements (23)
but. The rotary filter according to any one of claims 10 to 13, characterized in that the rotary filter extends radially outward from the connecting intermediate wall (24) that unites the dough. .