SU1245342A1 - Apparatus for separating materials - Google Patents

Description

 . 1Z4

The invention relates to the field of separation and solid materials into fractions with the help of liquids and can be used in heat supply plants to exclude the disposal of ash dumps.

The aim of the invention is to improve the quality of separation during the separation of the dust fraction of coal ash.

Figure 1 shows the device (profile cut-out), a general view; and FIG. 2 is a section A-A in FIG. 1, and FIG. 3 is a node I in FIG. 2,

The device includes a settling pit 1, made in transverse cutting of a drop-shaped form, formed by the hemisphere of pulproprode 2 and welded along the two side walls 3 forming it, also ak and end, converging upwards. Inside the settling chamber, parallel to the slurry stream 4, there is, to a lesser extent, one diaphragm made in the form of rods or: Gshastin 5, having transverse connections 6, giving the structure greater rigidity On the end or side wall of the settling tank in its upper part from the entrance of the slurry a drain nozzle 7 is embedded, the lower edge of the aperture of which is placed in the bottom of the minimum possible level of the mix in the tank. The opening of the drain pipe is partially blocked by the curtain shutter 8, hermetically overlapping the bottom and side edges of the hole, and the upper side of the gate is made with the possibility of vertical movement. A float regulator 9 (fig. 3), ash and slag solid sediment 10s part of the glass phase 1 1 bulk density less than one is fixed on it, the clarified water. 12. The device verification is closed by a cover 13 ..

The device works as follows.

The slurry 4, moving under pressure along the slurry pipeline 2, has an internal overpressure. The velocity distribution over the cross section of the slurry-4 stream is determined mainly by the nature of the distribution of the concentration of solid particles in the stream and theirs. size. As shown by sampling at the discharge of the slurry pipeline 2, despite the turbulent nature of the slurry 4, the bulk of the glass phase 11 (hollow balls) occupies the edge22

her top position. With an increase in the consistency of slurry 4, especially when the stream is saturated with coarse heavy particles (so

solid sediment 10), the latter tend to move at the bottom of the stream, causing greater resistance to the movement of the lower liquid layers. Therefore, in the lower layers of the movement

is slowed down and bottom speeds are reduced. The highest speed — the flow has along the so-called dynamic axis, which is always above the geometric axis of the flow. This increases its turbulence, leading to an increase in the intensity of mixing of solid particles, which reduces the efficiency of the ascent of the entire part of glass phase 11. To equalize the velocities of the various layers of the flow, its cross section is gradually increased by slitting line 2 installed on a diametrically longitudinal section of the settling chamber 1, which has

descent to the wall. Under the influence of the hydrodynamic pressure, the slurry 4 smoothly fills the settling tank 1. At the same time, the bulk of the glass phase 11, moving

along the top of the slurry, immediately floats along the inclined front end wall of the tank 1 and the remaining part of it drifts up as the slurry moves towards the rear

capacitance wall and 1, being in it, as in a trap.

To increase the efficiency of the glass phase, the turbulence of the slurry flow 4 is reduced by a diaphragm made in the form of rods or plates, 5 arranged parallel to the flow and rigidly connected by cross-links 6 with the side walls of the tank 1. The links 6 also provide increased rigidity of the whole structure. Due to the fact that the bottom of the tank 1 is the lower hemisphere of the slurry pipeline 2, the speed of the ash and slag sediment 1 O over its entire cross section is kept at the level of the speed in the slurry pipeline 2, which eliminates the jamming of the tank 1. The pop-up glass-phase 11 is localized through the drain box 7 Embedded in the upper part of the tank 1 from the sides: s entrance of the slurry into it. This placement of the drain pipe 7 provides a backflow of fluid in

the vessel 1, which, by increasing the efficiency of the emergence of the glass phase, makes it possible to reduce the length of the vessel 1.

The efficiency of removal of the glass phase 11 from the settling tank 1 is determined by the intensity of the drain flow, the value of which is set and automatically maintained by means of a curtain shutter 8 (Fig. 3) equipped with a float regulator 9. Curtain shutter 8 is a flexible membrane, partially overlapping drain hole and hermetically connected with the lower and side walls of the chamber. The free top of the membrane in the form of a curtain is put on a flexible element (rubber or spring) to which a float regulator 9, made of two hollow parts, is connected, hermetically, for example, by means of threads connected to each other. In this case, the lower half is set relative to the upper (constant

ten

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45342 -

ruktivno or with pomoir {ballast),. - THAT allows him to maintain a vertical position. From its weight, the free edge of the shutter 8 downwards, 5, the float regulator 9 opens the outlet to the glass phase 11 of the discharge pipe 7, which is transported along. using a small stream of clarified water 12. The detuning of the depth of the float regulator 9 and, consequently, the size of the open drain hole, depending on the consistency of the liquid, is carried out by changing the volume of the float at a constant weight by moving parts of the float regulator relative to each other. Drug free, unimpeded, the movement of these parts of the float cavity is connected to the atmosphere through the through holes. This changes the volume of the float without changing its weight.

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LA

Compiled by E. Kiseleva Editor L. Gratilo Tehred O. Sopko Proofreader L. Patay

3940/4

Circulation 514 Subscription.

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Design, 4-.

Claims (3)

; 1. DEVICE · FOR SECTION; NII MATERIALS, including • a settling chamber installed on the slurry piping with a diaphragm and a cover, a drain pipe located near the cover and attached around the perimeter of the drain hole in the wall of the settling chamber, characterized in that, in order to improve the quality of separation during separation. of the dusting fraction of coal ash, the settling chamber is made in the Cross section tapering to the lid, while the drain pipe is located on the input side of the pulp, and the diaphragm is made in the form of rods or plates parallel to the flow of the slurry. 2. The device according to claim 1, characterized in that it is equipped with a curtain shutter with a float regulator, wherein the curtain shutter is made in the form of an elastic membrane tightly attached to the wall of the settling chamber from the bottom and side along the perimeter of the drain hole. * 3. The device according to p. 1 and 2, characterized in that the float regulator is made of hermetically connected with the possibility of moving relative to each other two hollow parts, partially immersed in the pulp, while the unloaded part is made with holes.