JPS58202005A - Apparatus for defoaming high viscosity concentrated liquid - Google Patents

Abstract

PURPOSE:To remove air bubbles in good efficiency, by a method wherein reticular elements constituted from plural bars having slits at constant intervals, arranged in parallel relation to each other and having specific tapered surfaces formed thereto is internally mounted and a scraper relatively slid in external contact relation thereto is provided. CONSTITUTION:A main body 10 having a liquid inlet 11 and a liquid outlet 12 provided thereto in opposed relationship, having a drain port 4 provided to the bottom part thereof and having an air vent 4 provided to the upper part thereof is provided and reticular elements are mounted therein. The net like element 1 is constituted from plural bars having slits at constant intervals, arranged in parallel relation to each other, having smooth surfaces in the side of the liquid inlet 11 and having tapered surfaces 2b internally enlarged between adjacent opposed side parts. A scraper 6 is provided in a state relatively slid in external contact relation to the reticular elements 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention generally relates to a defoaming device for high viscosity concentrate;
Specifically, we would like to provide a defoaming device for high-viscosity concentrated liquids that can remove air bubbles and water droplets from high-viscosity COM (a mixture of fine coal and heavy oil) and color liquids at a high rate. It is something to do.

For high viscosity and high concentration liquids such as COM and color liquids, the minimum
．． It contains a large amount of minute air bubbles of about 8 mm, and its high viscosity makes defoaming and deaeration difficult. If this condition is left as it is, it becomes necessary to purchase or use COM or color liquid containing a large amount of air bubbles, which is often uneconomical or inconvenient to use.

Conventionally, in such cases, a centrifugal separator or an impact separator has been used as a gas-liquid separator for defoaming air bubbles contained in the concentrated liquid. However, these devices require only a ceiling, and their bubble removal efficiency is only about 60%.

As a result of intensive research into a defoaming device for high viscosity concentrated liquids using a sieve, the present inventors have found that air bubbles can be removed very efficiently by devising the shape and structure of the sieve.

That is, the defoaming device for high viscosity concentrated liquid according to the present invention is provided with a main body having a liquid inlet and a liquid outlet facing each other, a drain port at the bottom and an air vent at the top, and a reticular element built into the main body. In addition, the net-like element is made up of a large number of bars that have slits at regular intervals, are arranged substantially parallel, have a smooth surface on the liquid inlet side, and have a tapered surface that spreads inward between adjacent opposing sides. Embodiments of the present invention will be described below with reference to the drawings. In Figure 1, / is a reticular element.

The bars constituting the cylindrical mesh element have openings (slits) defined by adjacent bars, and have a smooth outer circumferential surface (2a) and a tapered surface that spreads inward between adjacent opposing sides. One is formed. This net-like element/ is produced by winding wire spirally around the outer periphery of a drum having openings at a predetermined pitch, and cutting and polishing the wire surface to form an inward expansion. Perforate at intervals.

A slit plate having a self-holding ability in which the V-cut grooves are formed discontinuously and the frame portion is integrally formed is formed by a method of forming the plate into a cylindrical shape so that the groove expands inwardly. I can do it.

Working surface of the mesh element/(outer peripheral surface of the bar), 2
A is smooth and forms a surface mesh, and by rotating the souffle bar B installed close to this surface relatively, the souffle bar O can scrape off air bubbles and water bubbles stuck in the mesh and regenerate the outer peripheral surface 2a. .

In order to configure the net-like element/to have a smooth surface as described above, it is particularly desirable to use one obtained by the above-mentioned V-cut method, and both roundness and smoothness can easily achieve micron precision. be able to.

Next, FIGS. 2 to 6 show details of the defoaming mechanism. In FIGS. 2 and 3, the air bubbles 30 contained in the high viscosity concentrate have a very large specific gravity around one periphery and are therefore highly compressed.

Therefore, its surface tension is large, and it acts strongly to maintain its perfect circular shape.
Normally, the deformation shown by the broken line A does not occur. Therefore, the air bubbles 30 sent to the opening of the bar d stay in this opening, and if the outer circumferential surface 2a of the bar is smooth, the knife-shaped tip 7 of the soufflé bar B will scrape out the remaining air bubbles 30. Take it and scrape it up.

The bubbles 30 that have been scraped together, combined, and expanded in diameter increase their buoyancy, float to the top of the liquid, and are discharged from the air vent.

On the other hand, if the outer peripheral surface 4a of the bar is not smooth, the fourth
As shown in the drawings and FIG. 5, the bubble 30 is locked in the opening at a position deeper than the outer peripheral surface a2a of the bar d. Therefore, since the souffle bar O scrapes off the air bubbles 30 while cutting them, the action of removing the air bubbles 30 becomes insufficient, and the working surface becomes clogged.

Moreover, as shown in FIG. 6, if the outer circumferential surface 2a of the barco of the net-like element l is not smooth, the air bubbles 30 will also rotate on the concave bar λ, as if dragged by the movement of the souffle bar B, and the soufflé bar O. Figure 7 shows a defoaming device for high viscosity concentrated liquids using such a mesh element. 9 to 9.

In FIGS. 7 and 8, / is a cylindrical net-like element as described above, consisting of a large number of bars arranged approximately parallel to each other at regular intervals, and a lid 3 is attached to the upper opening. The lower part is connected to the drain rod. IO is a main body with a liquid inlet// and a liquid outlet/, 2 facing each other on the side, a lid body /3 is attached to the upper opening, and a souffle bar O is rotated at low speed on the top of the lid body /3. A drive device M is mounted. Also, /llt is an air vent attached to the lid body /3, and /j is a drain port.

FIG. 9 shows another embodiment, in which the liquid inlet, 2/2, and the liquid outlet are installed so as to send liquid to the upper surface side of the net-like element 23, which is installed obliquely in the main body -θ. The main body, 20
It is placed on the side. In this embodiment as well, the outer surfaces of the bars constituting the net-like element 23 are smooth, with tapered surfaces extending inwardly between adjacent opposing sides.

In a defoaming device for high viscosity concentrated liquid having such a configuration, COM, color liquid, etc. sent from the liquid inlet //
The liquid is sent from the circumferential surface of the main body 10 to the net-like element/, from which air bubbles and water bubbles have been removed, and is sent to the next process from the liquid discharge side of the net-like element/, with the liquid outlet/2 turned red and white.

During this defoaming work, the souffle bar B is rotated relative to the net-like element / to constantly regenerate the outer peripheral surface 2a, and at the same time, the scraped foreign matter and floating matter are forcibly discharged from the drainer. .

Since the defoaming device for high viscosity concentrated liquid of the present invention is configured as described above, the bubble removal efficiency is about 95% or more, which is dramatically improved compared to the conventional example. In addition, water droplets could be separated from air bubbles at the same time, and these could be efficiently collected separately from air bubbles. Furthermore, the size of the air bubbles to be removed can be adjusted to a desired size by changing the spacing between the bars of the mesh element.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a mesh element used in the present invention, Fig. 2 is a cross-sectional perspective view of the main part of the mesh element, Fig. 3 is a plan view thereof, and Fig. 4 is a cross-sectional perspective view of the main part of another mesh element. 5 is a plan view thereof, FIG. 6 is a cross-sectional perspective view of the main part of the mesh element showing another behavior of bubbles, and FIG. 7 is an embodiment of the defoaming device for high viscosity concentrated liquid of the present invention. Fig. 8 is a plan view thereof, and Fig. 9 is an elevational view showing another embodiment.
//Liquid inlet/, 2 Liquid outlet /3 Lid/Da Air vent /, 5 Drain port M Motor IflIl Figure Guan 4 Figure i#i5 Figure! Pl 2 Prisoner Ivy Figure 3 Figure 6

Claims (1)

[Claims] 1. A main body is provided with a liquid inlet and a liquid outlet facing each other, a drain port at the bottom and an air vent at the top, and a mesh element is built into the main body. Consisting of a large number of bars arranged substantially parallel to each other with slits at intervals, having a smooth surface on the side facing the deceased, and forming a tapered surface that spreads inward between adjacent opposing sides,
A defoaming device for high viscosity concentrated liquids, characterized in that a souffle bar is provided that circumscribes the net-like element and slides relative to it. 2. The net-like element consists of a slit plate having a self-holding ability and having a frame portion integrally formed with a large number of slits formed by discontinuously perforating V-cut grooves at predetermined intervals. The defoaming device for high viscosity concentrated liquid according to item 1. 3. The defoaming device for high viscosity concentrated liquid according to claim 1 or 2, wherein the mesh element is formed into a cylindrical shape so that the slits expand inward. 4. The mesh element 3. A defoaming device for high viscosity concentrated liquid according to claim 1 or 2, wherein the element is an inclined flat plate.