SU1576816A1 - Vortex drier - Google Patents

Abstract

The invention relates to the field of drying dispersed materials with their simultaneous capture in the opposite swirling flows. The purpose of the invention is to increase the efficiency of the drying and trapping processes. The dryer includes a housing 1 with a window 2 in the lower part and a flat surface 3 in the upper part, a tangential input 4 of the peripheral flow, a lower tangential input 5 of the central flow with an input chamber 6 consisting of toroidal 7 and cylindrical 8 parts, and a displacer 9, exhaust pipe 10 with the bottom concave toroidal surface 11, the bunker 12 of the finished product. The process of drying and trapping dispersed materials occurs in the area of the spherical body 1 in the mode of counter-swirling flows. After heat treatment, the material particles enter the gap between the upper edge of the input chamber 6 and the plane of the window 2 and output into the bunker 12 of the finished product, and the spent coolant into the exhaust pipe 10. To adjust the average residence time of the material in the apparatus, the gap between the upper edge of the chamber 6 the insertion and the plane of the window 2 can be changed by screwing in or unscrewing the toroidal part 7 of the insertion chamber 6 into its cylindrical part. 1 hp f-ly, 4 ill.

Description

The invention relates to a drying technique with simultaneous trapping of material in counter-swirling flows and can be used in food, chemical, pharmaceutical, microbiological and other industries for drying dispersed materials, for example, alumina hydrate, crystalline lysine and other materials.

The aim of the invention is to intensify the processes of drying and trapping and control the average residence time of the material.

FIG. 1 shows a diagram of a vortex dryer, a longitudinal section; in fig. 2 - the same, top view; in fig. 3 shows section A-A in FIG. one; in fig. 4 - a central flow entry chamber.

The vortex dryer contains a spherical body 1 with a window 2 in the lower part and a flat surface 3 in the upper part, a tangential input 4 of the peripheral flow, a lower tangential input 5 of the central flow with an input chamber 6 consisting of toroidal and cylindrical parts 7 and 8, and a displacer 9, the exhaust pipe 10 with the bottom concave toroidal surface 11, the bunker 12 of the finished product.

The upper part 13 of the inlet chamber 6 is made in the form of a toroidal concave surface extending upward, the upper edge of which is located above the plane of the window 2, and its diameter is equal to the diameter of the window. The displacer 9 in the form of a body of rotation consists of an upper part 14 in the form of a cone with a concave generatrix and the lower part 15 in the form of a cylinder-rotating rotational surface extending upward.

Vortex dryer works as follows.

Gas suspension; the wet material and the heated coolant are supplied to the dryer via tangential inlet 4 of the peripheral flow. At the same time, the heated coolant is fed through the lower inlet 5 of the central stream to the dryer. A variant of the operation of the dryer is possible, when through the upper and lower inputs 4 and 5 a gas suspension is fed into the dryer. Once in the upper part of the spherical housing 1 in the area of the flat surface 3 into the dryer, the particles of the material under the action of centrifugal force are pressed into its near-wall region, where due to the structural design of the housing 1, they are subjected to tensile-compressive deformations, thereby completely eliminating the movement of material in the form harness (tape). In this case, the peripheral flow of the gas suspension moving from top to bottom in the housing 1 interacts with the same directional but oppositely directed central flow formed in the input chamber 6. Constructive construction of the inlet chamber 6 is in the form of a cylindrical-toroidal concave surface extending upward, the upper edge of which is located above the plane of the window 2, and its larger diameter is equal to the diameter of the window 2 and the displacer 9 with the concave cylindrical surface extending upward and conical with the concave portions 14 and 15, allows the central flow to be formed in such a way that not only

° support the rotation of the material and create some of its head in the near-wall zone of the middle of the spherical body 1, but also squeeze the material particles to the wall when locking the peripheral flow in the area of the input chamber 6. Such a character of the interaction of counter-directed tangled swirling flows leads to an increase in the relative velocity of the interacting phases and the active interfacial surface, i.e., the intensification of the drying process, and

 increase the efficiency of trapping the dryer. The capture efficiency is enhanced by removing material particles from the radial gas flow zone into the exhaust pipe 10, by eliminating the possibility of heat carrier getting into the finished product bunker 12 and due to the smooth rotation (and not sharp) of the peripheral gas flow in the center of the swirler the upper part 14 of the displacer 9, which does not lead to the capture of particles of the material and their removal from the apparatus by the gas stream.

After heat treatment in counter-swirling flows, the particles of material fall into the gap between the upper edge of the input chamber 6 and the plane of the window 2 and

output from the drying and entrapment zones into the bunker 12 of the finished product, and the exhaust coolant into the exhaust pipe 10. To regulate the average residence time of the material in the dryer, the gap between the upper edge of the input chamber 6 and the plane of the window 2 can be changed by screwing the toroidal part 7 camera 6 input into its cylindrical part 8.

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Claims (2)

1. A vortex dryer comprising a housing with an upper tangential inlet of the peripheral flow, a lower tangential inlet of the central flow, connected to a Sially located cylindrical chamber of its entry, equipped with an axial conical expeller, exhaust pipe in the upper part and communicated with the case through the window of the finished product bunker, characterized in that, in order to intensify the processes of drying and trapping, the case is spherical with symmetrically located relative to the vertical axis housing with an upper flat surface; the central flow inlet chamber is located inside the hopper and additionally contains an upper part in the form of a toroidal The upper edge of the concave surface, the upper edge of which is located above the plane of the window, and its larger diameter is equal to the diameter of the window, and the displacer additionally contains the lower part in the form of a cylinder-like concave surface extending upward, which is made it is not with a concave generator, and the lower part of the exhaust pipe is made in the form of a concave toroid-shaped surface that expands downwards. 2. Dryer according to claim 1, characterized in that, in order to regulate the average residence time of the material, the toroid-like part of the central flow introduction chamber is installed with the possibility of vertical movement. 72 4 Fig. 3 Figm