JPS63252518A - Rotary disc type separator - Google Patents

Abstract

PURPOSE:To control the residence time of liquid to be treated in the casing of a device and prepare concentrated liquid of desired density efficiently by controlling the liquid feed volume in accordance with the kind of the liquid to be treated independently of the separating liquid volume fixed by the rotating speed of a rotary disc. CONSTITUTION:A liquid feed means is provided on a rotating shaft of a rotary disc or on the rotary disc, and a means to control the liquid fed volume by means of the liquid feed means is provided at the inlet or outlet of the casing. For instance, a plurality of rotary discs 1 mounted on a rotating shaft 2 are respectively constituted of disc-shaped filter elements, and the infiltrate permeating the filter section is discharged as shown by an arrow mark (a) through a hollow inner section of the rotating shaft 2. Also, an impeller 4 is mounted as a liquid feed means and the liquid to be treated is fed into from inlet 10 of an outer case 5 shown as an arrow mark (b), flowing through as shown by an arrow mark (c), and the concentrated liquid separated from the infiltrate is fed out of an outlet 12 shown as an arrow mark (d). Also, a return line 13 for the liquid to be treated as a liquid feed control means and a flow line regulating a valve 14 are installed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotating disk type separation device, and particularly to a liquid feeding amount control means thereof.

(Prior art) In recent years, a solid-liquid separation method has been developed in which the liquid to be treated is passed parallel to the surface of the filter medium, a shearing force is generated between the surface of the filter medium and the liquid to be treated, and the liquid to be treated is concentrated by filtration. For example, 'De
Salination+ 35 (1980) No. 115
~128 pagesj (Netherlands, IElsevter S
Scientific Publishing Co., Publishing).

Various types of rotating disk type separation devices have been known as separation devices that utilize shearing force between the filtration surface and the liquid to be treated. A type that generates shearing force between the filter medium surface and the liquid to be treated (JP-A-61-25607, JP-A-61
-138505, Japanese Patent Application Laid-Open No. 61-181503), the filtration element and the disc are installed alternately, one of them is fixed, and the other is rotated, thereby creating a gap between the turbulent flow of the liquid to be treated and the filtration element. Types that generate shearing force (
Current status and issues of dynamic filters,” Chemical Equipment, 198
June issue, 1985, pp. 72-77; Jitsukai Sho 61-15900
No. 3) etc. are known.

(Problems to be Solved by the Invention) However, in the conventional rotating disk type separator, a pump is installed outside the device as a liquid feeding means to pressurize and feed the liquid to be treated from outside the device into the device. ing. When pumping a large amount of liquid to the separation device under increased pressure, the pump becomes large and
Additionally, since large-diameter pipes are used for the piping between the pump and the separator, there are problems with the large filling volume of the liquid to be treated, including the internal space of the separator, and the problem of high equipment costs. Not only that, but the liquid to be processed, which becomes highly viscous due to separation and concentration, is pumped into the separator equipped with a large number of discs, resulting in a pressure distribution within the separator, making it difficult to maintain the optimum pressure. As a result, there is a problem that the filtration efficiency decreases.

(Means for solving the problem) As a countermeasure to the above-mentioned problems of the conventional rotating disk type separator, an impeller, screw, etc. is mounted on the rotating disk and/or the rotating shaft that is rotated within the outer casing of the device. By providing a liquid means, there is no need to install a pump outside the device and use it as a liquid feeding means, and the filling volume of the liquid to be treated can be reduced. By providing separate liquid feeding means, even if the number of rotating disks increases, there is no pressure distribution within the separation device, the pressure can be maintained at the optimum level, and high filtration efficiency can be maintained, thereby solving the problems of the conventional device described above. can do.

However, in the liquid feeding means that can feed the liquid to be treated into the separation device by rotating the rotating shaft, the amount of liquid to be fed is determined by the rotation speed to maintain stable filtration efficiency by the filter element. Depending on the type of treatment liquid, there is a problem that the residence time of the treatment liquid in the separation device is not sufficient, and a concentrated liquid with a desired concentration may not be obtained.

(Means for solving the problem) According to the present invention, as shown in FIG. 1, the filter element is composed of a disc-shaped filter element or a disc disposed between fixed filter elements (FIG. 2). The rotating disk 1 is rotated into the outer casing 5 by the rotating shaft 2, and the liquid to be treated is introduced into the outer casing from the outer casing inlet 10 and is covered by the filter element until it is sent out from the outer casing outlet 12. In a rotating disk type separator configured to separate and concentrate a filtrate from a processing liquid, a liquid feeding means 4 is provided on a rotating shaft and/or a rotating disk, and is located at an inlet portion of an outer casing of this liquid feeding means. It is characterized in that means 13 for controlling the amount of liquid fed by the liquid feeding means 4 is provided.

As shown in FIGS. 1 and 2, the liquid feeding amount control means 13 returns the liquid to be treated from the outlet side 4a to the inlet side 4b of the liquid feeding impeller 4, which is a liquid feeding means adjacent to the outer casing inlet 4. The feed rate can be controlled by the following.

Further, as shown in FIG. 3, the liquid feeding amount control means can be configured to control the feeding amount by changing the cross-sectional area of the flow path on the impeller outlet side 4a using a movable orifice.

Furthermore, as shown in FIG. 4, the liquid feeding amount control means,
The peripheral wall of the flow passage in which the impeller is located may be configured with a movable tapered sleeve, and the flow passage may be controlled by adjusting the axial position of the sleeve to change the cross-sectional area of the flow passage.

(Function) According to the present invention, since the means for controlling the amount of liquid fed by the liquid feeding means located at the inlet or outlet portion of the outer casing is provided, the amount of liquid separated by the filter element determined by the rotational speed of the rotating shaft can be adjusted. The amount of liquid fed into the outer casing of the device can be independently controlled by the liquid feeding control means. Therefore, even if the liquid feeding means is provided on the rotating shaft and/or the rotating disk and the liquid to be treated is fed into the device outer casing from the device outer casing inlet by the rotation of the rotating shaft, The amount can be controlled independently of the amount of separated liquid, depending on the type of liquid to be processed, and by controlling the time that the liquid to be processed stays in the device, it is possible to efficiently produce a concentrated liquid of the desired concentration. Obtainable.

(Embodiment) FIG. 1 shows a first embodiment of the present invention. In the rotating disk type separator shown in FIG. 1, a plurality of rotating disks 1 mounted on a rotating shaft 2 are each composed of a disk-shaped filter element. Each disc-shaped filter element rotates together with the rotating shaft 2, and the hollow rotating shaft 2 is rotated so that the filtrate that has passed through a part of the filter is discharged as shown by arrow a through the hollow interior of the rotating shaft 2. Connection is fixed.

A plurality of chambers 7 are provided inside the vertical cylindrical outer box 5 of the separation device, separated by a partition wall 6 .

A rotating shaft 2 extends vertically inside the outer casing 5, and its both ends are penetrated through the outer casing end wall 5a, and are rotatably supported in the outer casing end 5a by suitable seals and bearings 8 in a fluid-tight manner. A motor 3 is connected to the upper end of the rotating shaft 2 so as to drive it.

A rotating disk 1 constituted by a disk-shaped filter element connected and fixed on a rotating shaft 2 is positioned to be rotated in each chamber 7, and a rotating disk 1 is positioned in a flow path 9 narrowed by a partition wall 6. An impeller 4 is installed on the shaft as a liquid feeding means.
is attached, and as the rotating shaft 2 rotates, the liquid to be treated is fed from the inlet 10 of the outer casing 5 as shown by the arrow C, and the filter medium surface 11 of the disc-shaped filter element is rotated as shown by the arrow C. The filtrate is separated and concentrated am liquid flows substantially parallel to the outlet 12 as shown by arrow d.
Sent from

In the example shown in this FIG.
A return path 13 for returning the liquid to be treated is provided in b, and a flow ff1iJl regulating valve 14 is attached to this return path 13.

FIG. 2 shows another embodiment of the present invention, in which the same parts as shown in FIG. 1 are denoted by the same reference numerals.

In the example shown in FIG. 2, a plurality of annular filter elements 5 are attached to the inner circumferential wall 16a of the double wall 16 of the outer casing 5 at vertically spaced positions, and each annular filter element 15 is attached to the inner peripheral wall 16a of the double wall 16 of the outer case 5. The filtrate that has partially passed through is 2
It is connected and fixed to the inner circumferential surface 16a of the double wall 16 so that it can be discharged through the inside of the heavy wall 16 as shown by arrow a.

In this example, the return path 13 is provided within the device outer casing 5.

FIG. 3 shows an example in which a movable damper 17 is provided on the outlet side 4a of the liquid-feeding impeller 4 to control the amount of liquid fed by changing the cross-sectional area of the flow path 9.

FIG. 4 shows a liquid delivery impeller 4 adjacent to the inlet 10 of the device outer casing.
The circumferential wall of the flow path 90 where is installed is constituted by a movable tapered sleeve 18, and by sliding this sleeve 18 in the axial direction with a shaft 19 that can be operated from the outside, the tapered portion 20 is displaced in the axial direction. An example is shown in which the cross-sectional area of the flow path is changed by this, and the amount of liquid sent is controlled thereby.

(Effects of the Invention) According to the present invention, the amount of liquid to be fed can be controlled independently of the rotational speed of the rotating shaft, and therefore, the liquid to be treated is fed into the outer casing of the device by the rotation of the rotating shaft. Regardless of the structure, the retention time of the liquid to be treated in the outer casing of the device can be controlled by controlling the amount of liquid fed according to the type of liquid to be treated, independent of the amount of separated liquid determined by the rotation speed of the rotating disk. It is possible to efficiently obtain a concentrated liquid with a desired concentration through control.

[Brief explanation of the drawing]

Figure 1 is a ring route diagram showing one embodiment of the rotating disk type separation device according to the present invention, Figure 2 is a ring route diagram showing another embodiment of the present invention, and Figures 3 and 4 are flow rate control. 3 is a ring route map showing various embodiments of the means; FIG. 1...Rotating disk 2...Rotating shaft 3...Motor 4...Liquid feeding means 5...Outer box
6... Partition wall 7... Chamber 9... Flow passages 13, 14; 17; 18.19... Liquid feeding amount control means Fig. 1

Claims (1)

[Claims] 1. A rotary disk consisting of a disk-shaped filter element or a disk placed between fixed filter elements is rotated into the outer case by a rotating shaft, and the liquid to be treated is sent into the outer case from the outer case inlet. In the rotating disk type separator configured to separate and concentrate the filtrate from the liquid to be treated by the filter element until it is sent out from the outlet of the outer casing, the rotation shaft and/or the rotating disk 1. A rotating disk type separator, characterized in that a liquid feeding means is provided at the outer casing, and a means for controlling the amount of liquid fed by the liquid feeding means is provided at an inlet or an outlet of the outer casing.