JPH07116677B2 - Disc filter device for pulp processing - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk filter device for pulp treatment for washing, concentrating or recovering slurry pulp from white water.

[0002]

2. Description of the Related Art Generally, in the production of pulp, the raw material blown out of a digester is separated from steam and gas, diluted with a dilute black liquor from a washing machine, and then sent to a washing apparatus in a uniform concentration. . Then, the cleaning device removes soluble impurities from the blown raw material to wash the pulp, and also collects a high-concentration waste liquid, and also involves a dehydration step to collect and transport the pulp from the slurry. , Make it suitable for storage.

Conventionally, drum type, wire belt type, disc type, table type and the like are known as the above pulp treating apparatus. Among them, the disc type is a disc-shaped disc filter oriented in the vertical direction. A plurality of sheets are installed side by side at a predetermined interval, and when the disc filter is rotated, the pulp slurry is sucked when the disc filter is positioned at the lower portion to accumulate the pulp on the filter surface, and the pulp is dehydrated while moving to the upper portion. The accumulated pulp mat is filled by the wind pressure in the blow-off zone as the suction is stopped.
It is a device that is peeled off from the surface of the battery and discharged to the chute.
It This type has an advantage that a large dehydration area can be obtained with a small installation area as compared with other types.

[0004]

DISCLOSURE OF THE INVENTION However, the disc type pulp processing apparatus is separated from the disc filter,
Alternatively, the scraped-out pulp mat often accumulates at the entrance of the chute portion and clogs this portion. For this reason, a dangerous removal work called clogging is forced. Also, it is effective to flush a large amount of white water to the chute part, but in order to maintain the bleaching concentration in the next step, it is necessary to avoid using a large amount of white water, and with a small amount of white water shower, such clogging will occur. It couldn't be resolved.

SUMMARY OF THE INVENTION The present invention is intended to provide a disk type pulp processing apparatus as described above, that is, a disk processing apparatus for pulp processing, in which conventional problems have been improved.

[0006]

DISCLOSURE OF THE INVENTION In a disc filter device according to the present invention, a plurality of disc-shaped disc filters are vertically arranged at a predetermined interval on a rotatable center drum, and a pulp slurry is attached to a suction position of the disc filter. supplies, and below the non-suction position to place the inlet of the pulp mat collecting chute, a doctor for further scraping pulp mat in a radial direction of the disk filter above the chute inlet
In the pulp treatment disk filter device in which the grate is arranged, in the vicinity of the chute portion inlet, a white water nozzle is installed which linearly crosses over the chute portion and jets white water under pressure, and at the chute portion inlet. The clogged pulp mat is cut, and white water recovery means communicating with a white water recovery vat is provided at the reaching point of the sprayed white water to prevent the white water from flowing down to the chute portion.

Further, the disc filter device according to claim 2, the chute portion inlet, while providing a pulp mat sliding plate which covers the center drum, said doctor-flop
A white water nozzle for linearly injecting white water under pressure along the upper surface of the doctor plate is installed near one end of the rate ends, which is far from the center drum, and the slide located at the other end of the doctor plate is installed. It is characterized in that a white water recovery hole communicating with the white water recovery vat is provided at the white water collision position of the plate.

A disk filter device according to a third aspect of the present invention is the disc filter device according to the first or second aspect, wherein the inner diameter of the white water nozzle is 2 to 10 mm and the water pressure of the discharged white water is 3 to 10 Kg / cm.
² , the diameter of the white water recovery hole is 4 to 10 times larger than the inner diameter of the white water nozzle.

[0009]

In the present invention, when the disk filter device is operated, the pulp in the pulp slurry is deposited on the surface of the disk filter by the suction of the disk filter,
Moisture is drawn into the thickness of the disc filter. When the pulp that has accumulated into a mat-like shape reaches the non-suction position as the disc filter rotates, it blows off in the blow-off zone.
It is dislodged from the surface of the filter by the wind pressure from . At this time, since the pulp mat is cut by the collision of the pressurized white water jetted across the chute inlet and preferably along the surface of the doctor plate , the pulp mat is easily clogged without clogging. It falls into the department. On the other hand, the pressure white water is, of course, not only when it does not collide with the pulp mat, but also after the collision, the momentum thereof is slightly attenuated and the diameter of the flow is slightly increased. It flows into the white water recovery hole provided and is recovered by the white water recovery vat.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a disk filter device according to the present invention, FIG. 2 is an explanatory view showing the operating principle of this device, and FIG.
FIG. 3 is a perspective view of a main part of the disk filter device according to the present invention. In FIG. 1, six disc-shaped disc filters 2 are attached to a center drum 1 attached to a main shaft 10 at predetermined intervals. The disk filter 2 is
The surface is covered with a metal core and is configured to be suctionable. FIG. 1 shows the upper part of these disk filters 2, and the main shaft 10 is supported by bearings 11 at both ends thereof.
The disk filter 2 is rotating at a predetermined speed from the upper side to the lower side in the drawing. As shown in FIG. 2, a slurry vat 3 for accumulating pulp slurry is provided in the lower part of these disc filters 2 in communication with a slurry supply port 4, and one revolution of the disc filter 2 is performed. A suction portion and a non-suction portion are provided therein.

As shown in FIGS. 1 and 3, in the non-suction portion, the pulse accumulated on the surface of the disk filter 2 is
Shoot doctor plate 5 for improving the fall of Pumatto together with provided extends and radially close to the surface of the de <br/> Isukufiruta 2, for collecting the pulp mat fell to its lower The entrance of the section 10 is open. A sliding plate 7 is provided at the entrance of the chute 10 so as to cover the center drum 1 and help the pulp mat to fall. Further, in the vicinity of one end of the doctor plate 5 farther from the center drum 1, a white water nozzle 8 for linearly jetting white water under pressure is provided substantially in the direction along the upper surface of the doctor plate 5. The white water nozzle 8 is connected to a white water pipe 12. Further, a white water recovery hole 9 connected to a white water recovery vat is provided on the side opposite to the white water nozzle, that is, at a position where the white water collides with the sliding plate 7 on the center drum 1 side.

In such a device, when the disc filter 2 is rotationally driven, when the disc filter 2 is immersed in the pulp slurry in the slurry vat 3, the disc filter 2 is sucked to remove the moisture that has passed through the filter. The pulp fibers attached to and deposited on the surface of the filter are separated. When the disk filter 2 reaches a non-suction portion by a further half turn, the pulp mat, which is a deposit of pulp fibers, peels off from the surface of the filter or is scraped off by the doctor plate 5 and assisted by the sliding plate 7. While falling, it falls into the chute unit 10.

When the pulp sheet is caught at the entrance of the chute portion 10, the pulp sheet is cut and reduced by the pressure of the white water jetted from the nozzle 8 and drops into the chute portion 10. In this case, since the white water has a pressure to easily cut the pulp mat, very little white water is lost at the time of cutting, and most of the white water is lost in the white water recovery hole 9.
Recovered from.

In this embodiment, the white water jetted under pressure is set to pass over the doctor plate 5, which allows the white water to pass where the pulp mat is most likely to get caught. It is a thing. Therefore, unless the efficiency of cutting the pulp mat is given the highest priority, it is not always necessary to pass over the doctor plate , and if it crosses over the entrance of the chute portion 10, it may be attached at any position. Does not matter.

The white water nozzle 8 has an inner diameter of about ² to 10 mm, preferably 7 to 8 mm, and a water pressure of about 3 to 10 Kg / cm ² .
It is preferably 4 to 7 Kg / cm ² . On the other hand, white water recovery hole 9
The diameter may be about 4 to 10 times the inner diameter of the white water nozzle 8.

[0016]

As described above, according to the present invention, the phenomenon that the pulp mat is clogged in the chute portion as described above can be solved by an extremely simple device. According to this device, not only the dangerous clogging work is not required, but also the amount of white water used that falls to the chute together with the pulp mat is extremely small and most of it is recovered, so that the bleaching concentration is almost eliminated. The bleaching efficiency can be maintained without lowering.
In particular, when the white water nozzle is arranged so that the white water under pressure passes over the doctor plate , it is extremely efficient.
The clogging of the pulp mat can be eliminated.

[Brief description of drawings]

FIG. 1 is a plan view of a disk filter device according to the present invention.

FIG. 2 is a principle diagram of a disk filter device.

FIG. 3 is a partial perspective view of a disk filter device according to the present invention.

[Explanation of symbols]

1 Center Drum 2 Disc Filter 5 Doctor Plate 7 Sliding Plate 8 White Water Nozzle 9 White Water Recovery Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsugu Sudo 1-1 No. 1 Tojo-cho, Yatsushiro-shi, Kumamoto Inside the Yatsushiro Mill, Tojo Paper Manufacturing Co., Ltd. (72) Kiyoshi Muraoka 1-1 No. 1 Jujo-cho, Yatsushiro-shi, Kumamoto Prefecture (72) Inventor Kenji Nakahara 1-1, Tojo-cho, Yatsushiro-shi, Kumamoto Prefecture Paper manufacturing company Yatsushiro Mill (72) Inventor, Kazuharu Hashimoto 1-1, Jujo-cho, Yatsushiro-shi, Kumamoto Jujo Paper Co., Ltd. Yatsushiro Mill (72) Inventor Toshiro Urano 1-1, Jujo-cho, Yatsushiro-shi, Kumamoto Prefecture Jojo Paper Co., Ltd. Yatsushiro Mill (72) Inventor Hiroyuki Shibamoto 1-1, Jujo-cho, Yatsushiro-shi, Kumamoto Toujou Paper Co., Ltd. Yatsushiro Mill (72) Inventor Masamichi Sakaguchi 1-1, Jujo-cho, Yatsushiro-shi, Kumamoto Prefecture Tojo Paper Co., Ltd. Yatsushiro Mill (72) Inventor Masatomo Tsuruta, Yatsushiro, Kumamoto No. 1-1, Jujo-cho Paper company in the Yatsushiro Mill (72) Inventor, Ryuichi Yoshino, No. 1-1, Jujo-machi, Yatsushiro-shi, Kumamoto Prefecture Yatsushiro Mill (72) Inventor, Kenichi Katayama, Yatsushiro-shi, Kumamoto Prefecture No. 1 of Jujo-cho No. 1-1 Tojo Paper Co., Ltd. Yatsushiro Mill (56) References JP-A-53-36078 (JP, A) JP-A-57-106792 (JP, A) JP-A-63-295784 (JP, A) Actual Kaihei 1-99408 (JP, U) Actual Kaihei 3-2000 (JP, U)

Claims (3)

[Claims] 1. A plurality of disc-shaped disc filters are vertically arranged at a predetermined interval on a rotatable center drum, pulp pulp is supplied to a suction position of the disc filter, and a pulp mat is provided below a non-suction position. The inlet of the recovery chute is located, and the doctor play for scraping off the pulp mat in the radial direction of the disc filter is located above the inlet of the chute.
In the pulp treatment disk filter device in which the jet is disposed, the chute portion inlet is provided with a white water nozzle that linearly crosses over the chute portion and jets white water under pressure, and the jetted white water is A pulp filter disk filter device, characterized in that white water recovery means communicating with a white water recovery vat is provided at a destination point. 2. A plurality of disc-shaped disc filters are vertically arranged at predetermined intervals on a rotatable center drum, pulp pulp is supplied to a suction position of the disc filters, and a pulp mat is provided below a non-suction position. The inlet of the recovery chute is located, and the doctor play for scraping off the pulp mat in the radial direction of the disc filter is located above the inlet of the chute.
In the pulp processing disk filter device was placed bets, the chute portion inlet, while providing a pulp mat sliding plate which covers the center drum, said doctor pre
A white water nozzle for linearly injecting white water under pressure along the upper surface of the doctor plate is installed near one end on the side far from the center drum of both ends of the blade, and the other end of the doctor plate is located. A disk filter device for pulp treatment, wherein a white water recovery hole communicating with a white water recovery vat is provided at a white water collision position of a sliding plate. 3. The inner diameter of the white water nozzle is ² to 10 mm, the water pressure of the discharged white water is 3 to 10 Kg / cm ² , and the diameter of the white water recovery hole is 4 to 10 of the inner diameter of the white water nozzle.
The pulp filter disk filter device according to claim 1 or 2, wherein the disk filter device is twice as large.