RU2346219C1 - Device intended for drying solutions and suspensions in fluidised bed of inert matters - Google Patents

Abstract

FIELD: heating systems, drying.

SUBSTANCE: invention refers to drying equipment, and namely to devices intended for drying solutions and suspensions, and can be used in chemical, food and other industries. Device used for drying solutions and suspensions in fluidised bed of inert matters consists of a chamber with gas-distributing grid whereunder located is a gas-supply duct, and atomisers arranged in the bed of inert matters, at that atomisers are fixed on a cross beam installed on a vertical hollow drive shaft with the possibility of rotation and vertical movement, and under gas-distributing grid there located is supply branch pipe of secondary heat carrier with a slot nozzle. According to the invention, gas-distributing grid is made in the form of a perforated washer connected with a perforated displacement cone, which is attached along external diameter between chamber and gas-supply duct, and along internal diameter - to the bottom of displacement cone; and to the lower part of cross beam there rigidly attached is a pin whereon along its axis provided are at least two trapezoid-shaped grooves interconnecting with elastic trapezoid-shaped members fixed on a front upper part of the cylinder installed so that it can rotate in the duct connected with supply duct of secondary heat carrier; at that, duct is located at the casing bottom; and to the cylinder perpendicular to its axis there connected is a supply branch pipe of secondary heat carrier which has along top generatrix a slot nozzle arranged under gas-distributing grid with a clearance of 0.5…1.0 mm; at that cylinder rotates in a stuffing box.

EFFECT: improving capacity of the device, and reducing sticking of material being dried to inert matters.

3 dwg

Description

The invention relates to drying equipment, in particular to installations for drying solutions and suspensions, and can be used in chemical, food and other industries.

The closest technical solution to the claimed object is a dryer for drying solutions, suspensions and pastes in a fluidized bed by.with. USSR No. 583358, F26В 17/10, 1976, containing a chamber with a gas distribution grill, under which a gas supply box is located, and nozzles placed in a layer of inert bodies, the nozzles mounted on a traverse mounted on a vertical hollow drive shaft to rotate, and in the gas supply duct there is a pipe (prototype).

A disadvantage of the known installations is that when supplying the source material (solution, suspension) through a fixed nozzle, it is not possible to achieve uniform irrigation of the entire layer of inert bodies, as a result of which sticking of individual sections of the layer occurs, which causes uneven fluidization and a decrease in the productivity of the installations.

EFFECT: increased installation productivity and reduced sticking of the dried material to inert bodies.

This is achieved by the fact that in the installation for drying solutions and suspensions in a fluidized bed of inert bodies, containing a chamber with a gas distribution grill, under which a gas supply box is located, and nozzles placed in a layer of inert bodies, the nozzles mounted on a traverse mounted on a vertical hollow drive the shaft with the possibility of rotation and vertical movement, and under the gas distribution grid there is a pipe for supplying a secondary coolant with a slotted nozzle, the gas distribution grill is made in the form a perforated washer connected to a perforated displacement cone, which is fixed in outer diameter between the chamber and the gas supply box, and in inner diameter is connected to the base of the displacement cone, and a rod is rigidly attached to the bottom of the traverse, on which at least along its axis two grooves of a trapezoidal shape interacting with elastic elements of a trapezoidal shape mounted on the front upper part of the glass mounted for rotation in the box, the connection a secondary coolant supply pipe, the box being placed in the lower part of the housing, and a secondary coolant supply pipe connected to the glass perpendicular to its axis, having a slotted nozzle along the upper generatrix and placed under the gas distribution grill with a gap of 0.5 ... 1.0 mm , while the glass rotates in the stuffing box.

Figure 1 shows the installation in longitudinal section; figure 2 is a fragment of the device of the beam, figure 3 is a cross section of the rod of the beam.

The installation comprises a cylinder-conical chamber 1 (Fig. 1) equipped with a gas distribution grill 2 at the bottom, under which a gas supply box 3 with a pipe 4 for supplying fresh coolant is located. On top of the chamber 1 is closed by a cover 5, having a pipe 6 for waste heat carrier. A displacement cone 7 is fixed on the grill 2, which is made perforated with a perforation coefficient greater than that of the gas distribution grill 2, which is made in the form of a perforated washer fixed by the outer diameter between the chamber 1 and the gas supply duct 3, and connected by the inner diameter to the base of the displacement cone 7. On the lattice 2 are inert bodies.

A hollow drive shaft 8 is placed along the installation axis, which is connected to the chamber 10 for supplying the source material using the stuffing box 9. A traverse 11 is mounted on the shaft 8, on which nozzles 13 are mounted using vertical tubes 12, attached to the tubes either directly or using a square, and nozzles 13 can be placed both in a layer of inert bodies and above the layer by moving the traverse 11 in vertical direction.

A rod 14 is rigidly attached to the lower part of the traverse 11 (Fig. 2), on which at least two trapezoidal grooves 15 are made along its axis, interacting with trapezoidal elastic elements 16 fixed to the end upper part of the glass 17 mounted with the possibility of rotation in the duct 18, connected to the supply pipe 19 of the secondary coolant, and the duct 18 is placed in the lower part of the housing 1. To the cup, perpendicular to its axis, is connected to the pipe 20 for supplying the secondary coolant having an upper minutes forming slit nozzle 21 arranged below the gas distribution grid 2 with a gap of 0.5 ... 1.0 mm. The whole system consists of a shaft 8, a beam 11, a cup 17 and a pipe 20, through a pair of bevel gears 22 and 23 connected to a variable speed drive (not shown in the drawings). When this glass 17 rotates in the stuffing box 24.

Installation works as follows.

Chamber 1 is filled with inert bodies. The main part of the fresh coolant is supplied through the pipe 4 to the gas supply box 3, from where the latter passes through the gas distribution grid 2, made in the form of a perforated washer connected to the perforated displacement cone 7, into the chamber 1 and creates an annular fluidized bed of inert bodies. The source material from the chamber 10 through the hollow shaft 8 is fed to the nozzles 13 for spraying into a layer of inert bodies or, if necessary, on a mirror of a fluidized bed. Due to the rotation of the beam 11, uniform irrigation of the entire layer occurs. Synchronously with the nozzles 13, the secondary coolant supply pipe 20 also rotates, having a slotted nozzle 21 along the upper generatrix, located under the gas distribution grill 2 with a gap of 0.5 ... 1.0 mm.

The secondary heat carrier with a temperature higher than that of the main part of the fresh heat carrier is brought through a glass 17 mounted for rotation in a duct 18 connected to the supply pipe 19. Passing through the slotted nozzle 21 and the openings of the gas distribution grid 2, the secondary coolant flow creates a local gushing zone in the layer of inert bodies. Due to the high temperature and high relative velocity of the coolant and inert bodies, the process of heat and mass transfer in this zone is very intense, which leads to an almost instantaneous drying of the film of the starting material on the surface of inert bodies. In the remaining mass of the layer at this time, the material is dried and the dried material is separated from inert bodies due to their collisions.

The proposed installation provides a more complete irrigation of a layer of inert bodies, as well as its mixing. In addition, the supply of an additional secondary coolant creates a zone of local gushing, which not only prevents the layer from sticking at the irrigation site with the source material, but also contributes to a more efficient flow of heat and mass transfer in this zone. All this leads to an increase in the specific productivity of the installation, and also improves the hydrodynamic stability of the fluidized bed regime.

Claims (1)

Installation for drying solutions and suspensions in a fluidized bed of inert bodies, containing a chamber with a gas distribution grill, under which a gas supply box is located, and nozzles placed in a layer of inert bodies, the nozzles mounted on a traverse mounted on a vertical hollow drive shaft for rotation and vertical moving, and under the gas distribution grill there is a secondary coolant supply pipe with a slotted nozzle, characterized in that the gas distribution grill is made in the form of a perforation oriented washer connected to a perforated displacement cone, which is fixed by the outer diameter between the chamber and the gas supply box, and by the inner diameter is connected to the base of the displacement cone, and a rod is rigidly attached to the bottom of the traverse, at least along its axis two grooves of a trapezoidal shape interacting with elastic elements of a trapezoidal shape mounted on the front upper part of the glass mounted for rotation in a box connected with a secondary coolant supply pipe, the box being placed in the lower part of the housing, and a secondary coolant supply pipe connected to the glass perpendicular to its axis, having a slotted nozzle located on the upper generatrix and placed under the gas distribution grill with a gap of 0.5-1.0 mm, the glass rotates in the stuffing box.

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