Untitled record

<td>POLAND ZECZPOSPOLITA</td><td>PATENT DESCRIPTION</td><td> 102276</td>

<td>bbUkl UU 1 WL 1 1 Π CHINA</td><td></td><td></td>

<td></td><td>Additional Patent</td><td>c ZV 1 LL Ν1A</td>

<td></td><td>to patent no.</td><td></td>

<td></td><td></td><td>PateoTo * office</td>

<td></td><td>Reported: 07.07.76 (P. 190913)</td><td>lilsui} Lwmij</td>

<td></td><td>Priority: -</td><td>Int. Cl.^{and 2 * *} B01J 2/06</td>

<td>OFFICE</td><td></td><td></td>

<td>PATENT</td><td>The application was announced: 13.02.78</td><td></td>

<td>PRL</td><td>Patent description published: 30.07.1979</td><td></td>

Creators of the invention: Stanisław Nastaj, Bolesław Skowroński, Jerzy Baranowski

Patent holder: Instytut Nawoizów Zabawnych, Puławy (Poland)

Equipment for the production of granules and

The present invention relates to a device for producing granules by solidifying droplets of a melt in a liquid having a specific gravity lower than the specific gravity of the alloy.

Known devices for producing granules of ^{5 * * * *} The substances that are drunk in the liquid form a column into which the coolant and the molten substance are fed through a system of nozzles. The bottom of the column is usually a tank equipped with devices for discharging granules in a continuous manner^{10 * * * *} or periodic to the distributor. In the case of hydraulic transport of granulate, appropriate devices feeding the granulate with liquid to the distributor are located in the upper part of the column.

The cooling liquid is introduced into the co-column ^{15 * * * *}or countercurrent to the alloy. Some columns also have additional connectors for the supply of coolant, located along the height of the column.

A device known from Polish patent No. 94399 ^{20 * * * *} consists of a vertical cooling column placed inside a hydraulic conveyor with a diameter larger than the diameter of the column. A conical bottom is attached to the bottom of the column, after which the granules slide down to the conveyor²⁵ hydraulic, from which the liquid along with the granules is fed to the gutter attached to the outside of the conveyor, and from there to the separating devices. Above the cooling column is a device for introducing 3 ° molten streams. Liquid to the hydraulic conveyor is fed from below, and granulation liquid is fed from the top of the cooling column.

The device is additionally equipped with elements for generating turbulent fluid movement inside the column. This type of construction of the device does not provide favorable conditions for the formation and solidification of droplets, because the temperature of the liquid is practically equal throughout the entire column and does not provide either the right time for drop formation, or good cooling of the granules. These defects are not present in the device according to the invention, whose construction ensures a clear temperature difference inside the column in the sphere of forming and solidification of the alloy.

According to the invention, the granulate making device, consisting of a vertical cooling column placed inside the transport column, has an additional column for forming droplets. This column is located inside the cooling column and is connected to it in the upper part in a hermetic way, and in the lower part through a mesh, with a space for draining liquid at an intermediate temperature in the space between these columns.

The drop forming column in the upper part has a collector for supplying warm liquid, an alloy pressure tank and connectors for gas supply and discharge for regulating the pressure inside the device. Cold liquid granule 102 276

102 276 is fed from below. This design ensures that a higher temperature is maintained in the drop-forming zone and the liquid temperature is correspondingly low in the cooling and granule transport zone. This allows to obtain granules of any desired and narrow granulometric spectrum, with high mechanical strength and non-degradable. The device does not pollute the atmosphere or sewage. It is particularly suitable for the production of granules from urea alloys, ammonium nitrate, sulfur etc. materials.

The device according to the invention will be explained in more detail in the translation of the embodiment in the drawing.

The device consists of three columns placed _fromcombined in one another with different lengths. Column 3 with the smallest diameter and the shortest called drop-forming column is closed from above by a lid. An alloy thrust tank 1 is mounted in this cover having from the bottom of the tube 2 for the outflow of alloy streams. Outside the drop-forming column, in its upper part there is a collector 9, which feeds the inside of the column with 3 holes 18 warm liquid, supplied through line 10. The column for forming droplets has a tax line 11 for gas supply. The pressure of this gas is measured with a manorrier, not shown in the figure, mounted on the conduit 12. The gas is discharged from the device via conduit 13 or 14. The gas evacuation conduits are admitted into the drop-forming column.

In the case of supplying the melt stream from the liquid mirror, the gas is discharged via a conduit 13 reaching just below the openings 18 of the collector 9, and in the case of the melt stream being supplied under the liquid mirror, the gas is discharged through a conduit 14 whose outlet is located above the pipes of the alloy pressure tank. The device may have both gas discharge pipes or one of them, depending on the method of granulation.

The drop forming column 3 is separated from the column 4 mounted on it, called the cooling column, by means of a grid 17. It is preferred that the grid 17 is attached outwards at the bottom of the drop forming column obliquely upwards to the cooling column 4. Cooling column 4 closed from above and settled on the column 3 of drop formation below the collector

9. The cooling column has a conical bottom 7 attached to this column by means of flat bars arranged in parallel on the periphery.

Outside the cooling column 4 is a column 5, called a transport column. A constant distance between these columns is ensured by the spacers 8. The transporting column 5 has a cold liquid supply line 15 from below, and from the top on the outside it has a built-in trough 6, which serves to feed the granulate along with «liquid to distribution devices not shown in the drawing. A conduit 16, located in the upper part of the cooling column 4, is used to drain the medium temperature.

The device also has pumps for forcing liquid movement.

The principle of operation of the device is as follows: the molten substance of the tank 1 in the form of streams through the tubes 2 is fed to the warm zone (column 3 of molding), created by a 10-hole 18 collector pipe 9 hot granulation liquid moving in relation to the introduced streams stop in a current direction.

At the same time, compressed gas is supplied to the hot zone through line 11, which then escapes through lines 12 or 14, maintaining a liquid mirror in this zone at the level of the end of line 13 or 14, i.e. below or above the lower ends of the tubes

2. Pressure regulation is possible by lowering or increasing the connected elements 1, 3, 4 in relation to the outer cylindrical wall of the transporting column and by changing the height of the alloy level in the tank. 1. Drops generated in the warm zone, the size of which depends mainly on the diameter of streams flowing out of tubes 2 and the turbulence in this zone under the influence of heavy forces⁷bones and movement of the warm liquid fall down the device, passing to the cold zone (cooling columns 4), in which they contact countercurrently with the cold liquid, solidifying and cooling to the desired temperature.

The flow of liquid through the cold zone is regulated by means of a pump withdrawing liquid at an intermediate temperature from the boundary space of both zones through conduit 16. A properly cooled granulate falls onto the conical bottom 7, after which it slides towards the outer wall of the transporting column. The rapidly flowing cold liquid between the walls of columns 4 and 5 discharges the cooled granulate to an obliquely positioned gutter 6 and further to the devices separating the granulate from the liquid. The separated liquid, after cooling, is returned back to the device via conduit 15. Part of the liquid at intermediate temperature is returned to the equipment via conduit 10, and the remaining liquid is mixed with the liquid separated from the granulate and recycled to the equipment via conduit 15. Mesh 17 prevents accidental entrainment granules with a liquid at an intermediate temperature.