SU1482965A1 - Method of loading pellets onto firing cars of conveyer machines - Google Patents

Abstract

The invention relates to the production of agglomerated iron ore in ferrous metallurgy, namely the production of pellets. The purpose of the invention is to increase productivity and improve product quality. When loading the protective bottom and side beds in the invention, partial replacement of the side bed 2 with raw pellets is used by reducing the width of the side bed from the height from bottom to top. The width of the side bed is reduced in height from the size of 8-12 caliber pellets at the bottom by 3-4 caliber pellets for every 20% of the total height of the layer, including the height of the bottom bed 1, the layer of raw pellets 3 and the protective bed 4. The load of the bottom side bed is carried out combined the stacker, and the change in the width of the side bed is achieved by changing the angle of inclination of the walls of the loading hopper of the bed. 1 il.

Description

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31482965

The invention relates to the production of agglomerated iron ore in ferrous metallurgy, namely the production of pellets.

The purpose of the invention is to increase productivity and improve product quality.

Protection of kiln carts of conveyor machines from overheating and warping 10 in the process of high-temperature calcination of pellets is carried out by placing special (returnable) protective layers of the bottom 15 and on-board beds of conditioned calcined pellets between the raw pellets and the body of the cart. These recirculation material flows significantly limit the productivity of the firing equipment and reduce the quality of the finished product. Therefore, a reduction in the number of recycled material flows (their complete elimination on serial kiln machines is not currently possible) provides an increase in machine productivity and an improvement in the quality of the finished product.

In the invention, a method of partial exclusion from the board bed with the replacement of it with raw pellets during their firing in the most favorable temperature-temporal parameters of the process was applied.

The drawing shows the principle-35 scheme of packing of individual material flows on the kiln carts, cross section.

Example. First, a combined bedder loads the bottom bed 1 and the side bed 2 through the loading bunker 40 by a single stream. The height of the bottom bed 1 is set equal to 0.19 of the total bed height

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3.5 caliber pellets, i.e. from 120 mm to 3 mm (where 12 mm is the caliber of pellets). Thus, to the surface of the layer of raw pellets 3 (to the mark of 400 mm from the grate floor of the kiln carriage) the width of the side bed 2 comes to naught.

On top of the bottom and between the side beds 1 and 2, raw pellets 3 are fed through the roller stacker. In the central areas of the baking carriage, the height of the layer of raw pellets 3 is set to 0.58 of the height b, i.e. 0 mm On the side bed 2 and the layer of raw pellets 3, at the sides of the carts, a protective bed 4 is placed with a height of 0.23 from the height b, i.e. 0,23x520 120 mm. Such packing of the layer ensures reliable protection of the metal of the kiln carts against high temperatures, an increase in the productivity of the kiln equipment due to a decrease in the recirculation flow of the burned pellets, and an increase in the quality of the finished product due to an increase in the share of raw pellets located in the upper half of the layer and therefore processed under improved temperature and time conditions. x, elimination of instrument thaws and emissions of pellets from the layer in the cooling zone.

The present invention provides an increase in the specific productivity of the calcining equipment by 1-3%, increasing the strength of pellets by 20-30 kg / approx. and reducing the amount of fines in them to 3%.

Claims (1)

The invention The method of loading pellets for burning, i.e. 0, mm (where 520 mm - 45 vg trolleys of conveyor machines, including the total height of the layer). The side bed is placed 0.58 in height from height b, i.e. 0,58x520 300 mm. By varying the angle of inclination of the walls of the loading hopper of the bed, the width Q of the side bed 2 is set to a variable, gradually decreasing from the bottom up. For every 20% of the total height of the layer, i.e. 0.2 x 520 mm 104 mm, the width of the side 55 of the bed 2 is reduced from 10 gauges to stacking sequentially bottom and side beds made of baked and raw pellets, which is different in that, in order to increase productivity and improve product quality, the width of the side bed at a height equal to the height of the layer of raw pellets is reduced from bottom to top from 8-12 caliber pellets 3-4 caliber pellets for every 20% of the total height of the layer. g 10 15 20 thirty 35 40 25 3.5 caliber pellets, i.e. from 120 mm to 3 mm (where 12 mm is the caliber of pellets). Thus, to the surface of the layer of raw pellets 3 (to the mark of 400 mm from the grate floor of the kiln carriage) the width of the side bed 2 comes to naught. On top of the bottom and between the side beds 1 and 2, raw pellets 3 are fed through the roller stacker. In the central areas of the baking carriage, the height of the layer of raw pellets 3 is set to 0.58 of the height b, i.e. 0 mm On the side bed 2 and the layer of raw pellets 3, at the sides of the carts, a protective bed 4 is placed with a height of 0.23 from the height b, i.e. 0,23x520 120 mm. Such packing of the layer ensures reliable protection of the metal of the kiln carts against high temperatures, an increase in the productivity of the kiln equipment due to a decrease in the recirculation flow of the burned pellets, and an increase in the quality of the finished product due to an increase in the share of raw pellets located in the upper half of the layer and therefore processed under improved temperature and time conditions. x, elimination of instrument thaws and emissions of pellets from the layer in the cooling zone. The present invention provides an increase in the specific productivity of the calcining equipment by 1-3%, increasing the strength of pellets by 20-30 kg / approx. and reducing the amount of fines in them to 3%. The invention of the method of loading pellets on kiln carts conveyor machines, including stacking sequentially bottom and side beds made of baked and raw pellets, which is different in that, in order to increase productivity and improve product quality, the width of the side bed at a height equal to the height of the layer of raw pellets is reduced from bottom to top from 8-12 caliber pellets 3-4 caliber pellets for every 20% of the total height of the layer.