SU1534081A1 - Arrangement for feeding pulverulent materials into converter with lateral gas withdrawal - Google Patents

Abstract

The invention relates to non-ferrous metallurgy, in particular pyrometallurgical methods for producing heavy non-ferrous metals. The purpose of the invention is to reduce dust removal when loading dust-like materials into a converter with side exhaust gases due to the fact that the air inlet pipe is set at an angle of 22-30 ° to the axis of the loading pipe and is offset from the center of the axis by the ratio of the diameter of the loading pipe to the continuation of the axis of the nozzle, equal to 1.3-1.5. This creates an ejection flow entraining solid material, which, moving through the loading tube, is accelerated by gravity, as well as by ejection. At selected angles and displacement, the main mass of the air flow moves close to the walls of the loading tube, as if forming an annular flow with small velocities in the axial zone. Inside this annular flow a reduced pressure zone is formed to eject pulverized material over it, which leads to a significant reduction of dust removal. 2 Il.

Description

The invention relates to non-ferrous metallurgy, in particular, to pyrometallurgical methods for producing heavy non-ferrous metals.

The purpose of the invention is to reduce dust and dust.

Figure 1 shows the device; figure 2 - section aa in figure 1.

The device consists of a bunker 1 connected by a belt feeder 2 with a loading telescopic tube 3, which is directed to the throat of converter A, and an air duct 5 connected to the loading tube.

The device works as follows.

The pulverized material from the hopper 1 through the belt feeder 2 enters the loading tube 3. The feeding pipe of the air flow from the air duct 5 is supplied at an angle of 22-30 ° in the vertical plane and offset from the center of the pipe axis by is the continuation of the axis of the nozzle, equal to | 1.3-1.5 (figure 2). This creates an ejection flow at the top -

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with

4i

About 00

section of the loading pipe, which. entrained hard material. The latter, moving along the loading tube, is accelerated by gravity, as well as by ejection.

Since the ejecting air is introduced into the loading pipe at an angle and is offset from the center of the pipe axis, the VECTOR OF THE SPEED OF THE INPUTABLE AIR

The main flow can be decomposed into two components - rotational and axial. Due to the rotational velocity, the air flow is pushed back to the pipe walls and creates the necessary rarefaction zone along the axis of the loading tube, through which the pulverized material under the action of gravity moves downward with the axial velocity by ejection. At the exit of the pipe, the air flow, due to the rotational velocity, expands and creates a protective cone of the air flow, which minimizes the effect of the waste gas flow on the feed material. In the center of this protective cone to the melt, a dust-air mixture will pass, thus creating a minimal dust removal.

The smallest dust removal is achieved when the material is fed at an axial speed of 20-25 m / s and rotational

forming a protective cone air

Compressed air

five

0

five

0

flow at the outlet of the loading pipe, equal to 30-35 m / s.

At selected angles of 22-30 ° and a displacement of 1.3-1.5, the main mass of the air flow moves close to the walls of the loading tube, as if forming an annular flow with low speeds in the axial zone. Maximum speeds develop at the walls. Inside this annular stream, a necessary zone with reduced pressure is formed to eject a pulverized material over it.

The device allows to reduce dusting by 10 times.

Claims (1)

Claims Apparatus for supplying pulverized materials to a side-gas converter comprising a hopper connected by a feeder to a loading pipe and an air duct, characterized in that, in order to reduce dust removal, the air inlet pipe is located at a distance from the upper end of the loading pipe equal to 1/3 of its length, directed at an angle of 22-30 to the loading pipe and offset from the center of its axis by the ratio of the diameter of the loading pipe to the chord, which is a continuation of the axis of the nozzle, 1.3-1.5. one L-oSpojtwv gazopd Ш1 Nipple ford Of air FIG. g