SU602213A1 - Drum-type nodulising unit for agglomeration charge - Google Patents

Description

one

This invention relates to the metallurgical industry, namely to the pelletizing equipment of the metallurgical industry.

 A significant effect on the pelletization of the charge and its granulometric composition has a wetting of the charge materials in the drum.

The device for moistening materials in the drum is a sprinkling pipe with a series of holes with a diameter of 2.5-3 mm located at a distance of 25-100 mm; Water is supplied to the pipe at a pressure of 4-5 atm.

The disadvantage of this drum pelletizer is the uneven supply of water over the cross section of the charge stream (mixing coefficient for moisture 0.606). From the holes, water flows out of the jets, as a result of which local waterlogging of the charge occurs, loose lumps are formed, which are further destroyed. Part of the charge remains unmoistened and does not pelletize.

The closest to the proposed invention in technical sushitnosti and achieved. The result is a device for mixing and pelletizing of fine-grained materials, containing a driven horizontal body, loading and unloading units

and a humidifier consisting of air and water-supply pipes with nozzles distributed along the length of the drum 2.

The disadvantage of this pelletizer is incomplete pelletizing of small fractions of the charge. The aim of the invention is to intensify the granulation.

To do this, in the proposed m. Plowing device, coarse-dispersed

nozzles, with this. The first of them is located from the front at a distance of 0.05-0.1 of the drum length and is directed at an angle to the axis of the body and in the direction of loading.

In the loading part of the drum in the area equal to 0.1-0.2 of the drum length and at the distance of the research institute 0.05-0.1 the length of the drum from its end, the charge is segregated in cross section, large particles move along the flow periphery, in the central portions of the stream concentrate fine dust fractions. This localization is maintained over the remaining length of the drum. For the formation of granules of small fractions, a sufficiently large mass (drop) of moisture is necessary, which coagulates them. Installing the nozzle at an angle of 60-70 ° to the axis of the drum so that

the spray of water spray crosses the flow of the charge, which feeds from the hopper into the drum, contributes to a more complete use of the surface of the non-segregated bath charge. The axis of the remaining injectors direction. Lena at an angle to the vertical plane passing through the axis of the drum, equal to 2/3 of the angle of lift of the charge. Due to this, the lumps formed as a result of wetting of fine fractions can roll down over the surface of the charge into the lower part of the drum and acquire a certain strength, i.e. form granules. In the rest of the humidification zone, fine nozzles are placed in the drum. The finely sprayed nozzle gets on the gras, zeros and large pieces located on the surface of the skin, evenly moistens them, promotes growth and hardening. In order to prevent the finely sprayed moisture from falling on the drum walls and garnish, the axis of the fine nozzles is inclined at an angle to the vertical plane passing through the drum axis equal to 1/2 the angle of lift of the charge. The additional granules from the fine fractions of the charge formed in the loading zone of the drum are the centers of formation of larger and stronger granules with the further movement of the charge flow along the drum. Due to the intensification of granulation, the number of such centers increases and, consequently, the granulometric composition of the charge levels off, the amount of small particles decreases, the porosity of the charge and its gas permeability increase. FIG. 1 shows a drum frame; general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. B The drum pelletizer contains a driven horizontal body 1, loading and unloading units 2, 3, and a humidification device consisting of a water supply pipe 4 rigidly connected to each other with nozzles 5 and an air supply pipe 6 with nozzles. The water to the nozzle 5 is a nozzle with a diameter of 8 mm, air fore / IS,

And H

Jffho Hpi / lna isne / iKoducnep (pOp CljHOf ftepcHux, fopcyHOx

Claims (2)

H hole 7 - nozzle with slot hole 2x10 mm. The principle of such a water-air nozzle is to spray a jet of water flowing out of the water nozzle by striking a jet of compressed air from the air nozzle, with this the direction of the moisture plume corresponds to the direction of the axis of the air nozzle. The degree of dispersion of the sprayed water depends on the pressure of the compressed air supplied by the air nozzle. Air pressure has been experimentally found for fine injectors 1.5-2.0 atm and for coarse injectors 0.5-0.7 atm. To supply air to the nozzles of various pressures, the air supply pipe is divided in length into two sections: high pressure (zone of coarse nozzles) and low pressure (zone of coarse nozzles). Air is supplied to the low pressure section through pipe 8. Both sections of the air supply pipe 6 are connected to the workshop pneumatic network; air pressure is regulated by valves. The water supply pipe is solid and water comes from the humidity controller. Claims of the sintering batch, comprising a driven horizontal body, loading and unloading units and a moistening device, consisting of air and water supply pipes with nozzles distributed along the length of the drum, characterized in that, in order to intensify the granulation, in the loading section the zone is 0.1-0.2 drum length, coarse nozzles are installed, the first of them is located from the end of the drum at a distance of 0.05-0.1 of the drum length and directed at an angle of 60-70 ° to the axis Orpus and in the direction of loading. Sources of information taken into account in the examination: 1.Indish I. I. “Mechanical equipment of sinter plants, Metallurgizdat, 1961, p. 123. 2. USSR author's certificate number 382298 cl. From 22 to 1/24, 1973.