SU908257A3 - Plant for drying dispersed materials - Google Patents

Abstract

DRIER FOR SMALL SIZED MATERIALS This invention relates to a drier for small sized material, of the kind in which the wet material is conveyed through the drier by an air flow and is stripped of its moisture contents by slamming against a gridlike wall which is inclined with respect to the direction of flow. According to the invention a secondary air flow is introduced into the material conveying duct as forming an acute angle with said gridlike wall.

Description

one

The invention relates to a technique for drying dispersed materials, preferably granulated using an air flow transporting a moist material and then colliding the latter with a perforated wall that is more or less inclined relative to the direction of flow.

A known installation for drying dispersed materials, comprising a duct, a pneumatic tube connected to it with accelerating and baffling sections, the first of which is connected to the feed hopper, and the second is at an acute angle to the first and is perforated with the bottom wall located after the accelerating portion of the pneumatic tube.

The additional air flow is directed from above perpendicular to the transport stream and contributes to

pressing the material against the perforated bottom wall, thereby improving the removal of moisture Llj A disadvantage of the known installation g is the significant impact force of the particles of the material with the perforated wall, which leads to crushing of the material and its adhesion to the wall, which is as a result of becoming waterproof. As a result, installation performance is reduced.

The purpose of the invention is to increase

15 performance.

The goal is achieved by the fact that at least one pipeline is connected to the channel, and in the upper wall of the fender section

20 opposite to the perforation, holes are made communicating with the channel and directed at an acute angle to the bottom wall of the fender section, mainly at an angle not large S.

In addition, the angle between the accelerating and chipping sections pneumatic tubes

 Mr

equals 15.

Additionally, the accelerating section of the pneumatic tube is made in the form of a flattened Venturi tube.

FIG. 1 shows schematically the described installation; 2, an installation view from above; in fig. 3, an installation section along section A-A in FIG. 2; in fig. - the same, in section BB in fig.Z.

The drying unit includes a duct 1 for introducing the main stream of air supplied by a compressed air source (not shown) through appropriate pressure control means.

At the outlet of the air duct 1, inside the box 2, there is a pneumotube 3 with an accelerating section k and a fender section 5. The accelerating section k includes a flattened Venturi tube 6 into which the feed funnel 7 opens to supply wet material.

The baffle section 5 is a linear pipeline having a rectangular cross section and forming an acute angle (about 15) with an outlet opening of the accelerating section k. Said straight pipe 3 has a perforated bottom wall 8, which wet material carried by the main air stream hits for the subsequent dewatering step. Under the perforated wall 8, a channel 9 is provided for collecting and unloading liquid that has leaked through the holes of the perforated wall 8.

The upper wall 10 of the baffle section 5, located opposite the perforated wall B, has an opening 11 (FIG. 3), which form an acute angle (preferably 45 ° or slightly less), with the axis of the straight-line section 5 pneumatic tubes 3.

The baffle section 5 communicates through apertures 11 with a duct 12 (Fig. 3), which is connected to two air ducts 13 for introducing the respective secondary air flows (Fig. 2). These streams are supplied mainly by the same air source, which supplies air to the main duct 1, however for

pressure adjustments are provided by separate means.

The installation works with; as follows.

The main air flow supplied through the air duct 1 under pressure corresponding to the nature of the material to be dried enters the flattened Venturi tube 6 and here it captures the wet material from the feed hopper 7 Then the pneumatic tubes 3 introduced into the straight fender section 5, the main air flow and the material carried along by it hit on the perforated wall 8, the slope of which causes the material to strike against it. This impact is amplified, but not to such an extent as to cause the material to be crushed, by a secondary transverse flow, coming with the desired slope through the holes 1 of the upper wall 10.

As a result, the wet material loses liquid, which seeps through the holes of the perforated wall 8, and then discharges through the channel 9. The holes remain clean due to the transverse air flow leaving channel 12. Under the pressure of the main air flow and without any interference the sides of the cross-flow are dehydrated, so the material continues on its way until it reaches the outlet of the drying plant.

Claims (2)

1. Installation for drying of dispersed materials, mainly granulated, containing an air duct, a pneumatic tube attached to it with accelerating and chipping areas, the first of which is connected to the feed funnel, and the second is at an acute angle to the first and is made with a perforated bottom wall additional air flow, located after the accelerating section of the pneumatic tube, is characterized in that, in order to increase productivity, at least one pipeline is connected to the channel, and ke baffle portion opposite the perforations formed by the faith ti .soobschayuschies channel and under nagyulvpeink acute angle to the bottom wall of the fender, mostly at an angle not greater than 45 °. 2. Installation according to clause I., which means that the angle between the accelerating and the breaker sections of the pneumatic tube is equal. Plant according to claim 1, wherein the acceleration of the pneumatic tube is made in the form of a flattened Zenturi tube. Sources of information taken into account in the examination 1. British patent If 1389909, cl. FUG publ. 1S75. "M t to m: s Yu / 7