UA77867C2 - Method for charging blast-furnaces equipped with trough cone-free loading mechanisms - Google Patents

Abstract

The invention relates to ferrous metallurgy. A method for charging blast-furnaces with trough cone-free loading mechanisms comprises by-turn separate loading two skips of agglomerate and two skips of coke to different intermediary hoppers, thereafter said materials are unloaded to reverse trough, at that additional third skip, which is filled up to shift empty intermediary hopper separately of another delivery of materials, is introduced to coke delivery, thereafter it is unloaded to reverse trough. The invention allows to increase production of cast û iron and reduce consumption of coke.

Description

Description of the invention

The invention relates to ferrous metallurgy, in particular, to blast furnace production, and can be most effectively applied when loading blast furnaces equipped with tray BZP (coneless loading devices).

There is a known method of mixed loading of the charge into intermediate bunkers KA 4. AK 1. Both coke and agglomerate are loaded into both hoppers, which slightly reduces the oriented circumferential unevenness characteristic of all tray distributors. At MK "Azovstal" such loading of the charge was used entirely (100 905) on the blast furnace Mo Z to YOsvoenie technologies of blast furnace melting on a furnace equipped with a conical loading device with a tray distributor of the charge / A.A. Bachynin, A.G. Popov, V.S. Polyanychno et al./Stal, 1993. - Mo 3. - b. 14-211.

The known method does not fully solve the problem of the invention, because when coke and agglomerate are placed in one hopper at the same time, their mixing occurs during pouring onto the furnace. This makes it difficult to regulate the radial distribution of the charge and gases. In addition, there is a large winnowing of fines when loading small masses of agglomerate using the KA AKII system. At MK "Azovstal" at the same time, the CO content in the center of the furnace is 10-12 90 instead of the optimal 3-4 95.

The closest technical solution - a prototype - is the traditional way of loading the charge with trays

BZP, which alternately contains separate loading of two skips of agglomerate AA 4. and two skips of coke KK 4 into different 720 intermediate bunkers with subsequent delivery from them to a rotating tray |Bolshakov V.I. Theory and practice of loading blast furnaces/ V.I. Bolshakov // M.: Metallurgy. - 1974. - 312 p.

Therefore, the charge is collected in one of the bunkers, and the charge is unloaded from the other at the same time at the given filling level. One-sided delivery of charge materials causes significant unevenness of the circumferential distribution of the ore and coke component of the charge. When the direction of the tray coincides with the direction of movement of the charge from the intermediate hopper, the speed of its descent from the tray will be greater than when the tray is located on the other side of the furnace, since part (o) of the energy of the charge movement is extinguished. Therefore, in this case, a smaller mass of the charge is poured, compared to with its amount in the first half of the furnace, when the direction of movement of the charge on the surface behind the hopper, in the central heat and on the tray coincided. A significant circumferential unevenness in the distribution of the charge negatively affects the distribution of the gas flow through it, which determines additional coke consumption and a decrease in furnace productivity .

They are trying to compensate for this unevenness by changing the loading of agglomerate and coke into intermediate bunkers. For example, if AA 4. was loaded from the left hopper, and coke from the right, then it is loaded oppositely to AA in the right hopper, and coke in the left one. Such a replacement is made, but not very often due to the loss of time for this operation. As a rule, in this case, there is a measure and it is difficult to load the furnace to it. Often at the same time, the smooth operation of the furnace and its thermal regime are disturbed. Therefore, the materials in the bunkers are not changed as often as necessary, and this is clearly not enough to compensate for the uneven distribution of ore loads and gas flows. This affects the increase in coke consumption in the first place and the decrease in furnace productivity.

The invention is based on the task of developing such a method of loading blast furnaces equipped with tray BZP, in which, due to changing the loading order of agglomerate and coke, the circular "unevenness of the distribution of the charge in each subsequent feed is compensated, which will allow to increase the uniformity of the circular p") with the distribution of materials and furnace gases, providing better use of physical and regenerative energy of gases and due to this saving coke and increasing production of iron. )" The problem is solved by the fact that in the method, which includes the alternate separate loading of two skips of agglomerate and two skips of coke into different intermediate bunkers with subsequent delivery from them to a rotating tray,

According to the invention, an additional, third skip of coke is introduced into the coke supply, which is loaded into the next empty intermediate hopper separately from the other supply, with subsequent delivery to the rotating tray.

The task is also solved by the fact that an additional skip of coke is introduced in every second - third serving.

Ш- In addition, the additional skip is loaded directly into the axial zone and a smaller mass of coke is fed into it than in the previous skips.

A new way of loading blast furnaces equipped with BZP allows to compensate for unevenness

Means of circular distribution when unloading the charge due to the constant change of intermediate bunkers with ore

Both materials and coke without interruptions in loading the blast furnace, as well as simultaneously intensifying the axial flow of gases.

Loading of the charge is carried out according to the following scheme: two skips of coke are loaded into the first bunker, for example

Left. Then the agglomerate is loaded into the second hopper, in this example, the right one. When loading agglomerate into the right hopper, if there is a measure in the furnace, coke from the left hopper is fed through a rotating tray to the furnace

F) ovens. An additional (third) skip of coke is loaded into the left hopper. During this loading, if there is a measuring cup in the furnace, the agglomerate is discharged from the right hopper through the rotating tray to the furnace furnace.

An additional (third) skip of coke is loaded into the axial zone immediately behind the agglomerate, without waiting for measurement in the furnace. because then two skips with coke are loaded into the second, right, hopper, after which two skips of agglomerate are fed into the first, left, hopper. At the same time, if there is a measure, coke from the right hopper is loaded through a rotating tray onto the furnace furnace. After filling the left hopper with agglomerate, if there is a measure, the agglomerate is loaded onto the furnace. That is, the loading scheme looks like this: v5 KK y) left hopper AA )/, right hopper K /, left hopper

KK in the right bunker AA in, left bunker Ku, right bunker, etc. (arrows show the discharge of the charge onto the furnace). In the case when loading an additional coke skip

In each feed that delays the process of loading the furnace, an additional skip of coke can be used once in two, and in case of extended delays - in three feeds. The download scheme in this case looks like this:

KK y) left bunker AA )/, right bunker

KK in the left bunker AA ), right bunker K )/, left bunker

KK in the right bunker AA )/, left bunker

KK in the right bunker AA in, left bunker Ku, right bunker, etc.

Coke from the additional skip is loaded into the axial zone, which helps to increase the gas permeability of this zone and 75 intensification of the axial gas flow. Regulation of the intensity of the axial flow of gases is performed by reducing the mass of coke in the additional skip.

The method proposed in the invention for loading the charge into blast furnaces equipped with tray BZP requires an increase in the mass of materials loaded in the feed. This, in turn, will also have a positive effect on the uniformity of the circumferential distribution of the charge and less fanning of its particles along the horizontal and vertical sections of the furnace. The stability of the furnace operation and the use of thermal and regenerative energy of the furnace gases will increase, ultimately, the consumption of coke will decrease while simultaneously increasing the productivity of the furnace.

Claims (4)

The formula of the invention is more than 1. The method of loading blast furnaces with tray-less cone loading devices, which includes alternate separate loading of two skips of agglomerate and two skips of coke into different intermediate bunkers, after which the specified materials are unloaded onto a rotating tray, which differs in that a third skip of coke is additionally introduced, which is loaded into the next empty intermediate hopper separately from the other supply of materials, after which it is unloaded onto a rotating tray. 2. The method according to claim 1, which differs in that an additional skip of coke is introduced in every second - third serving. at 3. The method according to claim 1 or 2, which differs in that the additional skip is loaded directly into the axial zone Ge) of the blast furnace. 4. The method according to claims 1-3, which differs in that a smaller mass of coke is fed into the additional skip than in the previous ones - Zv СсКиПИ. - Official bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated microcircuits", 2007, M 1, 15.01.2007. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. - i» -i -i (ee) (o) what has) 60 b5