SU1005880A1 - Apparatus for granulating powder in fluidized bed - Google Patents

Abstract

1. DEVICE. FOR GRANULATING POWDER IN A PSEURAL WATERATED LIQUID, comprising a housing with a gas distribution grid, a FORCE 00 00 fluid feeding bottle, fitted over a layer of material, a pipe for unloading material, characterized in that with a body of increasing the uniformity of the particle size distribution of the body, the housing body, an increase in the uniformity of the particle-size composition of the product, the housing, characterized by the fact that the body of the granulometric composition of the product improves the uniformity of the grain-size composition of the product, the housing, characterized in that tapering upward cone with an angle at a greater recovery 60-85. 2. The device according to claim 1, wherein, there is a gaseous distribution grid with caps from a versus micron on the side wall facing the pipe to unload the material.

Description

The invention relates to the field of granulation of powder and can be used in the production of building materials, in the chemical, pharmaceutical, food, light and metallurgical industries, in particular in the production of welding materials: 1: 1, for example, for the manufacture of a mixture of welding flux cored wire.

A device for granulating powder in a fluidized bed is known, comprising a cylindrical body with a gas distribution grill, a liquid supply nozzle mounted above the layer of material, a pipe for unloading.

material 1.

However, when using the known device is not high enough homogeneity of the particle size distribution of the product,.

The aim of the invention is to improve the uniformity of the particle size distribution of the resulting product.

This target is achieved by the fact that, in a granulating device for a powder in a fluidized bed comprising a housing with a gas distribution grid, a liquid supply nozzle mounted above the material layer, a material discharge pipe, the housing is designed as an upwardly tapering corner with a larger base 60 85.

At the same time, the gas distribution grid has a cap with openings on the side wall facing the pipe for unloading material.

Performing a yorpus in the form of a narrowing janus with an angle at a larger base of 85-60 ° allows the gas flow rate to be changed 1.2-5.6 times the height of the fluidized bed) (at the height of the fluidized bed equal to half the diameter of the large base of the working chamber) which allows the effector to separate (separate) granules having a diameter of 3 to 10 particle diameters of the result of the south of the powder from the ungranulated powder. The inclination of the gas distribution grid for dense spherical granules 2–9 ° and for porous irregular shapes 9–18, as well as the direction of the holes in the caps to the unloading site, allow the resulting granules to be quickly removed from the working chamber.

The drawing shows the proposed wound torus, section.

The bruised torus consists of a body with three chambers: the upper sedative 1,

medium working 2 and lower sublattice 3. Calming chamber 1 can have different geometries depending on the chosen method of cleaning the dusty waste heat carrier, in this case the simplest cylindrical chamber 1 is shown, bounded above by a flat lid and having a pipe L for removing the dusty heat carrier. The working and subgrid chambers are separated by a gas distribution grid 4. The subgrid chamber is bounded laterally by a cylindrical housing 5, and from the bottom by a flat or conical bottom 6. The working chamber is bounded, from side to side 7 by a truncated cone with an angle of 85-6O with a larger base, bottom - gas. distribution grid 4. The gas distribution grid 4 has a slope of 2-18 to the center, where coaxially with it And with both housings, the upper end of the pipe 8 is fixed in the gas distribution grid to unload the pellets and blow off the fines connecting the working chamber with the sector feeder 9, which is placed behind outside the sublattice chamber and attached to the lower end of the tube 8. The caps 10 of the gas distribution grid 4 have openings located on that third of the side surface of the cap, which is divided in half by a plane passing through the axis of the working chamber and the axis of the cap. The caps 1O can be fastened to the gas distribution grid in various known ways (by means of welding, mounting, threaded connection). In this case, caps are shown that are threaded on the lower, narrower part, passing through the holes in the grille and attached to it with nuts 11, twisted, from below. A nozzle 12 is placed in the upper part of the working chamber to spray the solution or melt of the binding agent (IX) substance. A screw feeder 13 is fixed outside the lower part of the cone-shaped housing of the working chamber for feeding the initial powder. In the housing of the sublattice chamber, a pipe 14 for supplying a heat transfer fluid is fixed. A pipe 15 is attached to the pipe 8 for supplying separation air.

Pellet torus works as follows.

The original powder is loaded with a screw feeder 13 into the working chamber,

where the pseudo-diffuser is heated by means of a heat-outlet, the passage of the shchegch through the pipe 14 and the caps 10. of the gas distribution grid 4. The substance, for example, a solution of liquid glass, is sprayed on top of the nozzle 12 and connects individual particles into the aggregates. The granules formed and dried by the coolant are lowered onto the gas distribution p & n 4 and are fed to the mouth of the pipe 8 for unloading. The air flow rate at the separator through the pipe 15 is maintained at the level required to create such a speed in the outlet section of the pipe 8,

which would be equal to the soar speed of the granule with a size corresponding to the lower limit of the specified fractional composition of the finished granule. The resulting granules are discharged with ceKTopHbnvt feeder 9

The dusty waste heat carrier passes through the stilling chamber 1 and the pipe 3, and then is cleaned in dry cleaning devices (cyclones, filters) from the fluidized saw blade that is returned to the working chamber.

The table presents the comparative data obtained with different forms of body design.

Conic

(narrowing from up)

Cylinder

(constant slash)

Conic

(expanding with

up)

1.8 51,346.8 13.1 0.11 2.9 33.463.5 1O, 6 O, 1O

6.1 10.982.9 8.72 O, 91

75

20

110

125

110

20

ABOUT

125

75

2O

110

.

Table continuation

5.2

7.5

12.4

510О58806

The experiments were conducted on the charge No. 2 beo-nutty with a diameter of 0.4-2.0 mm, containing

powder suture representing more than 6% binder (a powder-like mixture of iron, shshvikovo - a thief of sodium-potassium water glass

spar, feldspar, rutile, ferro-density 1.4 g / cm). manganese, ferrosilipic and metallurgical- 5 Laboratory productivity

whom magnesite and the next granulated torus powders in all three experiments

Granule composition: 1.0-U, 4 mmtah was approximately 16 kg / h

OD%; 0.4-0.315 mm 1.85%; 0.315 paged granulator mixture. 0.20 mm 27.7%; O, 20-O, 1O mm 37.85%; As follows from the table, uniformity

0.10-O, O5 mm 27.70%; 0, О5-О mm 7.6%. The granulometric composition of the seamless production technology for casing in the form of cored wire requires a tapering upwards cone.

Claims (2)

1. DEVICE FOR GRANULATING POWDER IN A PSEUDO-LIQUEFIED LAYER, containing a body of a suction cup for supplying liquid, installing Hv above the material layer, a pipe for unloading, material, characterized in that, in order to increase the uniformity of the particle size distribution of the product, the body is made in the form of a tapering cone upward with an angle with a larger base of 60-85 °. 2. The device pop. ^ characterized in that the gas distribution grill has caps with holes on the side wall facing 1 1005880 2