SU1020740A1 - Pneumatic chute of sinter-burden-charging device - Google Patents

Abstract

The SHEVMATIC FLOW of the DEVICE for DOWNLOADING the AGLONERATION CHARGE, contains a casing, a dunce, front and side walls, a receiving sheet and a gas distribution grid, placed between them, in order to align the gas permeability of the layer to the same width and the width of the gauge with a width of a line that should be aligned with the width of the body and should be evened out. machines, the surfaces of the longitudinal sections of the gas distribution grid, located along the side walls of the pneumatic tray, are inclined to the axial part of the grid at an angle, and the width each longitudinal section is 0.2-0.3 (L of the width of the pneumatic chute. About NP 4;

Description

The invention relates to ferrous metallurgy, in particular to sintering machines with a belt conveyor, and can be used in sintering production in sintering ores and concentrates. The charging device of the charge hopper, drum feeder and reflection sheet p. However, the device does not provide a sufficiently high gas permeability of the charge on the performance carts of the sintering machine, which negatively reflects on the technical and economic indicators of the sintering process. The closest approach to the technical essence and the achieved result is the pneumatic chute of the device for loading the sinter charge, containing a collector, a bottom, front and side walls, and also a receiving sheet placed between them, and a gas distribution grid. A pneumatic tray is placed between the sides of the sintering carts, and its side and end walls protrude above their sides. The device can be equipped with a vibrator and shock absorbers connected to it, on which pneumatic tray 2 is installed. The known device does not provide a uniform gas permeability of the batch over the width of the sintering carriage, at its sides the gas permeability of the layer is higher than in the axial part. The reason for the noted disadvantage is that when unloading the charge into the receiving bunker, larger pieces roll back to the side stacks of the bunker, and the fines concentrate in the middle part, this distribution of the charge by size remains after loading the charge on the sintering carts. The purpose of the invention is the alignment of the gas permeability of the charge mixture across the width of the sintering cart, and an increase in the productivity of the sintering machine. The goal is achieved by the fact that in the pneumatic chute of the device for loading the sintering mixture containing a collector, bottom, face and side walls, and also between the receiving sheet and the gas distribution grid, the surfaces of the longitudinal sections of the gas distribution grid located along the side walls of the pneumatic tray are inclined to the axial part of the lattice at an angle of 165-177, and the width of each longitudinal section is 0.2-0.3 the width of the pneumatic tray. The drawing shows a pneumatic tray boot device with a partial cut of the side wall, a general view of axonometrics. The pneumatic tray has a bottom 1, one face 2, and two side 3 walls, as well as an receiving sheet It and a gas distribution grid 5 located between them. A collector 6, which is a longitudinal t-section, serves to supply air under the gas distribution grid. The collector cutout is limited: from the top - by the receiving sheet, from the bottom by the end wall, and from the sides - by the side walls of the tray. The axial section of the gas distribution grid is located at an angle of p 110-150 to the receiving sheet, and the longitudinal sections of the gas distribution grid located along the side walls of the tray are flat surfaces that are at an angle of 0 165-177 to the axial section of the grid. The width of each longitudinal section is 0.2-0.3 times the width of the pneumatic chute. These surface parameters of each longitudinal section of the gas distribution grid determine the curvilinear surface, the profile of which is determined by the nature of the uneven velocity of air suction through the batch layer across the width of the sintering machine sintering cart. Usually, the increased gas permeability of the bed batch on the side of the cart takes place in an area of 20-30% of the width of the cart. In this case, the width of the inclined side section of the gas distribution grid should also be 0.20, 3 widths of the pneumatic chute. In order for the gas permeability of the batch (250–350 mm in height) at the side of the trolley to be the same as on its axis, it is necessary that the height of the layer at their side exceeds the height of the batch of the axial portion by 60–120 mm. Then the angle between the side and axial sections of the gas distribution grid (for typical aglomachines 2 m wide tape) should be in the range of 165-177.

Pneumatic tray works as follows.

The mixture is initially poured onto the receiving sheet. pneumatic chute, and then on the gas distribution grid 5. Under the action of air jets emanating from the grid holes, the charge goes into a fluidized state and acquires properties of a flowing fluid, as a result of which the surface of the charge along the width of the grid tends to change its horizontal position. Due to the inclination of the lateral sections of the gas distribution grid to the axial section at the sides of the sintering machine sintering cart, a relatively large amount of charge is unloaded than in the axial section. As a result, the profile contour of the batch layer on the trolley takes the form, j5, close to the profile of the gas distribution grid turned 180 degrees. Thus, the profile of the layer of the mixture on the sintering carriage is uneven: its maximum height is at the side of the carriage, i.e. in the place where the gas permeability of the charge mixture was the highest, as a result, the rate of air suction through the layer on the trolley is leveled

Pneumatic tray with conventional gas distribution grille and with

lattice having inclined side. plots tested in a laboratory unit in the sinter shop of the Zaporizhstal loan. When using the usual1

the gas distribution grid height of the resulting mixture of the charge across the width of the cart is almost the same (see table). In the case of loading the charge with a pneumatic chute having a gas distribution grid with lateral sections inclined to the axial part, made in the form of planes, the layer height at the sides of the trolley is higher than on the axis, which contributes

alignment of gas permeability of the mixture to the width of the cart.

The table shows the experimental data on the loading of the sintering mixture by a pneumatic chute having a conventional gas distribution grid (basic version) and a grid with lateral sections inclined to its axial part (proposed version).

Aligning the air velocity over the width of the sintering machine sinter carriage by additional loading with the charge of the onboard sections allows an increase in the productivity of the sintering machine to 10%.

The expected economic effect from the use of the pneumatic chute of the proposed design is 1 million tons of agglomerate.

Air flow to the pneumatic tray

Characteristics of the gas distribution grid:

sheet thickness, mm

diameter of holes, mm live section

the angle between the receiving sheet and the axial section of the gas distribution

lattice p) hail

the angle of inclination of the side surfaces of the lattice to its axial part is about

The height of the layer of the charge on the cart, mm

2500

3

0.15,125

Claims (1)

PNEUMATIC TRAY OF THE DEVICE FOR DOWNLOADING THE AGROMERATION BATCH, containing a collector, a bottom, an end and side walls, a receiving sheet and a gas distribution grill between them, with the aim of equalizing the gas permeability of the charge layer the width of the sintering trolley and increasing the productivity of the sintering machine, the surfaces of the longitudinal sections of the gas distribution grill, located along the side walls of the pneumatic chute, are inclined to the axial part of the grill at an angle of 165 “177 °, and the width for each longitudinal portion is 0.2-0.3 pneumatic width tray.