SU1101642A1 - Spray drier - Google Patents

Abstract

A SPRAYER DRYER contains and a drying chamber equipped with a disk sprayer and a spiral heat carrier inlet, characterized in that, in order to intensify heat and mass transfer, the drying chamber is made in the form of a hollow disk with a horizontal axis of symmetry, along which at an equal distance from the side walls of the disk equipped with heating elements, a sprayer is installed, and the input of the heat transfer medium is made in the form of two nozzles symmetrically located on both sides of the sprayer. (L

Description

The invention relates to a technique of spray drying and heat treatment of highly dispersed suspensions, emulsions and solutions, and can be used in the chemical, food, pharmaceutical and other industries.

A known spray disc dryer contains a vertical cylindrical chamber, in the upper part of which a sprayer and a gas distribution device are placed, equipped with nozzles for separate output of exhaust gas and material 1.

The disadvantage of this spray disc dryer is the low intensity of heat and mass transfer.

Closest to the invention is a spray dryer comprising a drying chamber equipped with a disk sprayer and a spiral inlet of the heat transfer medium 2.

A disadvantage of the known spray dryer is that the heat and mass transfer intensity is not high enough.

The purpose of the invention is the intensification of heat and mass transfer.

This goal is achieved by the fact that in a spray dryer containing a drying chamber equipped with a disk sprayer and a spiral fenlon carrier inlet, the drying chamber is made in the form of a hollow disk with a horizontal axis of symmetry, along which at an equal distance from the side walls of the disk equipped with heating elements the sprayer, and the input of the coolant is made in the form of € two nozzles symmetrically located on both sides of the sprayer.

FIG. 1 shows a spray dryer; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG.

The dryer contains a drying chamber 1 with side walls 2, a disc sprayer 3, nozzles 4 for tangential heat carrier entry, chambers 5, drive 6 and product supply tube 7, guide plates 8, guide vanes 9, passing into spiral channel 10, spiral partition 11, the discharge pipe 12, the heating elements 13.

The use of a disk sprayer 3 with a horizontal axis of rotation allows the drying chamber 1 to be made in the form of a vertical hollow disk, in which the hydrodynamic asymmetry characteristic of disk spraying installations is eliminated by installing the sprayer 3 in the center of chamber I with equal distance from the side walls 2 of chamber 1 and symmetrical installing the nozzles 4. The invention solves the problem of uniform distribution of the heat transfer medium in the tank without the formation of dead zones and stabilizes the position of the spray pattern, reducing the negative e impact produced when the rotating dispensers 3 the vent effect, thereby eliminating the release of moist, not yet dried particulate material. on the side walls 2.

In order to intensify heat and mass transfer, guide vanes 9 are installed around the periphery of the subsampling chamber 1, which allow forming a swirling flow of heat carrier and ensuring high relative velocities of gas particles in the peripheral part of chamber 1. For heat treatment of heat-resistant materials or products requiring intensive heat supply to remove for example, structural moisture or other kind of temperature transformations, the side walls 2 are provided with heating elements 13.

Spray dryer works as follows.

The source product through tube 7 is supplied under pressure to the disk sprayer 3, installed centrally in the drying chamber 1 with equal removal of the side walls 2. Here, to the spray root through the nozzles 4, flow of heat carrier flows towards each other, which are introduced into the dryer using the forward plates 8 in the direction of movement of the sprayed particles (from the center to the periphery) along the side walls 2 of the drying chamber 1. The dried material is distributed in the volume of the chamber 1 in the form of a vertical spray that is flushed from both sides raschayuschimis coolant flow that stabilizes the flame, the material provides a uniform distribution and heat transfer fluid and increases the contact area of the heat medium -c spray torch.

A dried product with waste heat carrier is removed from the apparatus through

discharge pipe 12. When heat-resistant materials are processed, the dispersed particles in the course of their movement from the disk to the periphery of the chamber 1 are supplied with additional heat due to convection and radiation from the heated side walls 2.

The invention allows to significantly intensify the process of heat and mass transfer. AFIG. 2 A

Claims (1)

A SPRAY DRYER containing a drying chamber equipped with a disk sprayer and a spiral coolant inlet, characterized in that, in order to intensify heat and mass transfer, the drying chamber is made in the form of a hollow disk with a horizontal axis of symmetry along which at an equal distance from the side walls of the disk equipped with heating elements, a spray is installed, and the coolant inlet is made in the form of two nozzles symmetrically located on both sides of the spray. FIG. 1 SU „„ 1101642