JPS6090054A - Dust removing apparatus of pulp suspension - Google Patents

Abstract

PURPOSE:To minimize a reject discharge amount and to perform the dust removal of a pulp suspension with high refining effect, by continuously separating and removing light foreign matters and heavy foreign matters by one apparatus. CONSTITUTION:A rotary shaft 9, a scraper 8 and a screen plate 7 are arranged to the upper part of an inverted cone shaped liquid cyclone 1 to form a refining paper stock chamber 4 and a flotation separation chamber 3 is provided along the outer periphery of the refining paper stock chamber 4 while a partition plate 6 for collecting floated foreign matters is provided to one side of the flotation separation chamber 3 and a floated foreign matter collecting pipe 3 is provided to the upper part of the partition plate 6 in this side. In addition, a diluting, separating and water injecting pipe 11 is arranged to the lower part of a cyclone 1. By this mechanism, because foreign matters can be separated prior to being contacted with and passed through the screen plate 7, the quality of the revolving stream suspension generated at the central part of the cyclone is extremely improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulp suspension dust removing apparatus that continuously and efficiently separates and removes dust from a pulp suspension into light foreign matter and heavy foreign matter to select pulp.

In recent years, recycled waste paper for paper manufacturing has become an important part of paper manufacturing and processing technology.

With progress and diversification, a large number of defective foreign substances are generated when waste paper is turned into recycled pulp, especially light foreign substances such as hot melt, rubber adhesive, polyvinyl, etc., and conventional equipment cannot remove them. I couldn't remove it satisfactorily.

The present invention was developed in view of the current situation as described above, and its purpose is to continuously separate and remove light foreign matter and heavy foreign matter with one device, and to discharge rejects. It is an object of the present invention to provide an apparatus capable of removing dust from a pulp suspension with a minimum amount and with an extremely high screening effect.

Hereinafter, the present invention will be explained based on illustrated embodiments.

A supply pipe (2) is formed on the outside of the inverted cylindrical part (1a) and supplies the pulp suspension into the cyclone. The inside of the closed liquid cyclone (1) includes a sedimentation centrifugal separation cyclone (Water), a selected paper stock chamber (4) whose upper part is partitioned by a screen plate (7) and an annular partition wall (5); A selected stock discharge pipe 08), a discharge valve (to) and a delivery pipe (c) are provided.

In addition, a rotating shaft (9) passing through the selected paper stock chamber (4) is disposed in the upper central part of the cyclone (1), and the rotating shaft (9)
) A scraper (8) is attached to the lower end of the screen plate (7), that is, below the screen plate (7). Further, the rotating shaft (9) is connected to the motor via a pulley (28) provided at the upper end and a belt! There is. By rotating the scraper (8) at high speed, the screen plate (7) is
In addition to preventing clogging of the pulp suspension, the internal swirling flow by pressurizing the pulp suspension from the supply pipe (2) is accelerated, and the precipitation separation effect by the cyclone (r) and the flotation separation of light foreign matter are made more noticeable. I can do it.

In addition, in the center of the sedimentation centrifugal separation cyclone (f), the high-quality suspension from which light and heavy foreign substances have been separated becomes an upward swirling flow, and is completely removed by the notch groove of the screen plate (7) via the scraper (8). The selected paper stock, which is a high-quality suspension that has been separated and selected, is efficiently floated to the upper selected paper stock chamber (4), and the above-mentioned selected paper stock is passed through the discharge pipe installed in the selected paper stock chamber (4). is discharged to the outside.

Additionally, a partition wall (5) is installed along the outer periphery of the selected paper stock room (4).
) is provided with a flotation separation chamber (3).

An upper foreign matter collection tube (16) is provided, and a collection tube (16) is further provided.
A floating foreign matter discharge air valve (1η, floating foreign matter discharge pipe) is connected to.

With this configuration, by stopping the rotation, the air hits the float collection partition plate (6) and efficiently enters the collection pipe (16).The discharge air valve (lη) is automatically operated to intermittently separate and add water to the discharge pipe. (11, 1 is installed. This water injection pipe (
By adding a small amount of water from 1υ into the cyclone, effective paper stock and foreign matter can be reliably and effectively separated without floating the internal foreign matter.

In addition, heavy foreign matter and coarse foreign matter are deposited into the secondary separation chamber (I31) through the sedimentation reject chamber (B) provided at the bottom, and are discharged at arbitrary time intervals by the discharge air valve (149) at the lower end of the secondary separation chamber. It will be automatically ejected for a few seconds.

In addition, an internal see-through plate (15) is provided on the lower side of the cyclone, so that the state of foreign matter inside can be confirmed from the outside, and the cyclone (the inside of the ladle) can be constantly operated to check that the concentration of foreign matter is low.

In addition, for maintenance and inspection of the notched grooves of the screen plate (7) due to continuous long-term operation of the tilting device, the screen plate can be easily removed by loosening the tightening bolts on the flange installed on the outside of the upper cylinder of the cyclone. ) (7) is attached to the upper part of the device using the air cylinder (2).
21) can be released by υ1''.

As described above, the dust removal device of the above embodiment removes light foreign matter (
Hot melt, sticky foreign matter, pitch, polyvinyl), etc. can be reliably and efficiently floated and separated without disintegrating them. Moreover, in order to prevent floating foreign matter from entering the tank, a floating foreign matter collection partition plate and a collection discharge pipe are installed in the flotation separation chamber, and a discharge air valve is installed at one end of the discharge pipe, and the discharge valve is automatically operated by a timer. By repeating the operation and opening for several seconds at appropriate intervals, suspended foreign matter with an extremely high concentration of lees can be discharged.

In addition, coarse foreign matter, essential foreign matter, and undisaggregated foreign matter are swirled and settled inside the cyclone, and are separated into extremely high lees concentration by diluting and separating and adding water provided on the lower side. The waste is then re-separated in the secondary separation chamber, which is connected to the lower part after passing through the reject chamber, and the high lees rate rejects with a foreign matter concentration of 80% or more are passed intermittently through an automatic discharge valve located at the lower end of the secondary separation chamber. A trace amount of 0.02 to 0.1% of the processing flow rate is discharged.

As described above, the present invention provides an inverted conical liquid cyclone in a dust removal device having a selective stock chamber formed through a screen plate above a scraper that rotates about a rotation shaft disposed at the center of the upper part. A selected stock chamber is formed in the upper part of the screen in which the rotating shaft, scraper, and screen plate are arranged, and a flotation separation chamber is provided along the outer periphery of the selected stock chamber, and a flotation separation chamber is provided on one side of the flotation separation chamber. A pulp characterized by a glaze in which a partition plate for collecting floating foreign matter is provided, a floating foreign matter collection pipe is provided at the front upper part of the partition plate, and a diluting separation water injection pipe is further provided at the lower part of the cyclone. Since this is a dust removal device for wAR liquid, foreign matter is separated before it comes into contact with the screen plate, so the suspension of the swirling flow generated at the bottom of the cyclone is of extremely high quality, and the screen plate is completely free from clogging. In particular, since there is no adhesion of bundled growth of long fibers to the screen plate surface, long-term continuous operation is possible, and this revolutionary screen solves all the problems of conventional screens such as yield dust removal efficiency and low power consumption. It is a dust removal device.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is a plan view, Fig. 3 is a sectional view of the main part, Fig. 4 is a cutaway sectional view of the main part, and Fig. 5 is the same as that of Fig. 4. It is a view taken along the line A-A. (1)...Hydrocyclone, (3)...Flotation separation chamber, (4)...Selected paper stock chamber, (6)...Partition plate, (7
)...Screen plate, (8)...Scraper, (9)...Rotating shaft, (1υ...Water injection pipe, (IQ
)...Floating foreign matter collection tube. Patent Applicant Toyo Co., Ltd.

Claims (1)

[Claims] ■ In a dust removal device that has a selective stock chamber formed through a screen plate above a scraper that rotates on a rotating shaft located at the center of the upper part, the above rotating shaft, scraper, In addition to forming a selected paper stock chamber in which a screen plate is arranged, a flotation separation chamber is provided along the outer periphery of the selected paper stock chamber, and a partition plate for collecting floating foreign matter is arranged on one side of the flotation separation chamber. A dust removal device for a pulp suspension, characterized in that a floating foreign matter collection pipe is provided at the upper front side of the partition plate, and a dilution separation water injection pipe is further provided at the lower part of the cyclone.