RU2302286C1 - Device for droplet generation of granulator - Google Patents

Abstract

FIELD: chemical engineering.

SUBSTANCE: device comprises tank for melt of the material to be granulates. The bottom of the tank is made of a perforated heated plate. The plate is made of parallel perforated sheets provided with a system of axially aligned openings. The openings receive the pipes that represent the passages for discharging the melt. The heat-transfer agent circulates in the free space between the sheets. The space between the sheets could receive the system of baffles for laminarization of the flow of the heat-transfer agent.

EFFECT: enhanced quality of granules.

2 cl, 3 dwg

Description

The invention relates to the field of chemical technology, namely to installations for granulation of melts.

Known droplet granulator, which is a container containing a melt of granular material, the bottom of which is made in the form of a perforated plate with a spiral tubular heater attached to it (application Germany No. 2222008, CL B01J 2/02, 1980).

The disadvantages of this droplet is the insufficiently efficient heat transfer from the heater to the stove, as well as the incomplete use of the area of the stove for dropping.

Closest to the proposed invention is a droplet granulator, which is a container containing a melt of granulated material, the bottom of which is made in the form of a perforated plate, on which heaters made in the form of profiles of open section are rigidly fixed (RF Patent No. 2104765 dated 02.20.98 “Granulator”) .

Such a droplet former is less than the previously mentioned analogue, but still retains the same disadvantages: insufficiently efficient heat transfer and incomplete use of the plate area.

The objective of the proposed invention is to increase the efficiency and reliability of the droplet by providing uniform heating of all channels without exception for the flow of the melt with full use of the surface of the plate for droplet formation.

This problem is solved in that the inventive device contains a container for melt granular material with a bottom in the form of a perforated heated plate. The plate is made of parallel arranged, spaced apart at some distance, perforated sheets with a system of coaxial holes in which tubes serving as channels for outflow are fixed melt, and the coolant circulates in the remaining free space between the sheets.

The space between the sheets can be equipped with a system of partitions to organize the movement of the coolant and eliminate the risk of vortex structures that could disrupt the uniformity of the temperature field.

In the proposed embodiment, each tube, without exception, is surrounded by a coolant and the length of the heat transfer section of the metal, unlike the prototype, is limited by the thickness of the tube, which guarantees heating of the tubes and the same temperature for all channels of the melt flow. In addition, the absence of heaters on the surface of the plate allows you to fully use its entire surface for dropping.

In practice, there is often a decrease in the clearance of the droplet forming holes due to the deposition of mechanical impurities or products of undesirable chemical reactions. So, for example, when granulating sulfur, holes in the slab are covered with sulfide deposits. To prevent this phenomenon in the proposed device, it is possible to equip the tube of the plate with tubular inserts of a material inert with respect to the melt, for example, fluoroplastic in the case of sulfur granulation.

When carrying out the invention, a technical result can be obtained, consisting in increasing the productivity of the granulator due to the disappearance of "frozen" holes and the possibility of increasing the number of holes in the plate with the same dimensions, as well as facilitating the maintenance of the droplet formation, in particular its cleaning, in connection with the elimination of protruding elements on the surface of the stove.

In Fig.1 shows a cross section of a plate droplet, in Fig.2. - view of the plate in plan and section along the median surface, in Fig.3. - a fragment of the plate droplet in axonometry.

The droplet plate includes a top sheet 1, a bottom sheet 2, and tubes 3 fixed therein. Between the sheets 1 and 2, partitions 4 can be installed that organize the flow of heat transfer medium until the internal space of the plate is divided into a number of separate channels for circulation of the heat transfer medium.

The device operates as follows. A coolant is fed into the space between sheets 1 and 2 of the droplet plate, which heats the plate, after which a melt of granular material is fed into the space above the plate. Expiring through the tubes of the plate, the melt forms a system of jets, which are crushed into separate droplets, solidifying in the appropriate refrigerant according to the further technological process of the granulator of one or another specific design.

The technical and economic advantage of the claimed invention consists in improving the quality of the granules in connection with the stabilization of the temperature field in the plate and, therefore, ensuring the same conditions for the formation of all jets and eliminating the solidification of the melt in the nozzles.

Claims (3)

1. A droplet former of a granulator, including a container for melt of granular material with a bottom in the form of a perforated heated plate, characterized in that the plate is made of parallel perforated sheets with a system of coaxial holes in which tubes are fixed that serve as channels for melt flow, and free space between sheets filled with coolant. 2. The droplet former of the granulator according to claim 1, characterized in that the space between the sheets is equipped with a system of partitions to regulate the movement of the coolant. 3. The droplet granulator according to claim 1. or 2, characterized in that the tubes are equipped with inserts made of melt-resistant material.

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