SU1601128A1 - Method of loading charge materials into blast furnace - Google Patents

Abstract

The invention relates to blast furnace production and can be used when loading blast furnaces with un-bootable loading devices. The purpose of the invention is to save coke and increase the productivity of a blast furnace by increasing the degree of gas utilization. When loading in a feed cycle along with individual doses of coke and ore materials and portions of their mixture, the proportion of ore materials in the mixture at each angular position of the tray is proportional to the difference between the consumption of the mixture and the consumption of coke. The deviation of this fraction from the target value is determined, and if this deviation is positive, then the coke mass is increased and the mass of ore materials loaded in the feed cycle in the annular zone, corresponding to the angular position of the tray, is equal to the product of the mass of the mixture loaded in this annular zone. the amount of deviation of the share of ore materials in the mixture from the set. Stabilization of the furnace is provided. 3 il. 1 tab.

Description

The invention relates to ferrous metallurgy, in particular to blast furnace production, to methods for distributing charge materials at the top of a blast furnace.

The purpose of the invention is to save coke and increase the productivity of a blast furnace by increasing the degree of gas utilization.

Figure 1 shows the change in the composition of the mixture of ore materials and coke during loading (line 1) and unloading (line 2) of materials from the bunker; figure 2 - calculated (line 1)

and the actual (line 2) values of the proportion of ore materials in the mixture during the unloading process from the bunker; in FIG. 3, the distribution of the share of the mixture in the mixture on the conveyor (line l) and during unloading from the intermediate bunker (line 2).

The method is carried out as follows.

In a blast furnace equipped with at least one intermediate bunker with a weighing device and a charge distributor, including gas- load and distribution over the section

00

thistle of ore materials, coke and their mixture with a given average proportion of components at each angular position of the charge distributor measure the consumption of charge materials from the intermediate bunker, Dp portions of the mixture determine the proportion of the ore part in it, and if at a certain angular position of the distributor the ore part in the mixture is of a higher average value, then within the load cycle. ki, the mass of coke, the s-agglomerated on the same position of the distributor, is increased, and the mass of ore materials is reduced by an amount determined from the expression

AM MCM (Dp.M- DCP), ()

where M ,, - the mass of the mixture of ore Mate cm

rials and coke, discharged into the annular zone, t; D p d, - ore materials in

mixture discharged into the annular zone;

D p - average materials in the mixture, t / t. And the proportion of ore materials in a mixture is determined from the expression VCM VK

Р- Vf.M- VR

(2)

where V; .., V mass flow

from a mixture hopper, ore materials and coke, t / s.

At the test facility, the nature of unloading a mixture of ore materials and coke into the furnace is investigated. On the physical model, the change in the composition of the mixture in the process of unloading is studied in various methods of preparing mixtures: the mixture is prepared in a special mixer, achieving the maximum

homogeneity; simulate conditions

preparation of the mixture, actually existing on the blast furnace.

The proportion of components in the mixture is determined when loading portions of the charge into the bunker and unloading from it. Dp this select 10 samples of charge materials during loading and unloading of each portion. The interval between sampling is the same and the sample is 10% of the mass of the loaded (unloaded) portion of the charge. As can be seen from FIG. 1, even when the composition of the mixture, when loaded into the bunker, practically does not change (line 1),

components in the mixture when discharged in individual samples differs from the average value by 1.5 times or more (line 2). Along with sampling the charge, the mass flow rate of the mixture is measured when unloading from the hopper.

Figure 2 shows the change in the share of ore materials (oksh + sinter-

rat) mixed with coke in the process of unloading from the bunker: line 1 dol ore materials, determined by the rate of the mixture outflow; Line 2 - dated materials, determined by sampling. The experiment shows that both methods of control give identical results, i.e. The total amount of ore materials in a mixture is determined by the consumption of the mixture and the individual components of the charge, which are included in its composition by the expression

V

- VK

iiM Vp.M - v

(3)

where D - dol. ore materials in a mixture with coke;

V J, - coke consumption from the hopper,

t / s; ore consumption

from the bunker, t / s; U (.ddd - flow from the mixture hopper

ore materials and coke, t / s.

On a blast furnace, the proportion of pellets in the mixture with coke is determined by the flow rate of the mixture from the bunker. In this case, the mixture is formed as follows. The coke is placed on the conveyor, and the top is uniformly stacked on top. In the tail part of the portion of the mixture, a section of pure coke is left in order to prevent the rolling of the oats on an inclined conveyor. The mass of the mixture is 47.5 tons, the ratio of coke: octane is equal to 0.47:: 0.53o The charge materials are selected along the entire length of the inclined conveyor. 10 samples are taken which are taken every 36 m. Analysis of the samples allows to obtain distribution of the mixtures in the mixture along the portion length on an inclined conveyor. When this mixture is unloaded from the bunker, the rate of its outflow is measured according to the indications of the weighing device, as well as the average outflow rate for every 5 tons of the mixture. By preliminarily measuring the flow rates from the bunker, separately pellets and coke, the fraction

51

pellets in a mixture of them with coke according to the formula (3).

Fig. 3 shows the distribution of pellets over the length of a portion of the mixture on an inclined conveyor (line 1) and the distribution of pellets during the process of unloading the mixture from the intermediate hopper into the furnace (line 2). Obviously, the distribution of materials in the mixture during unloading from the bunker is very different from that which was during the formation of a portion of the mixture on the conveyor. In the future, the fraction of ore materials is determined in all portions of the mixture. with J OKCCM at each position of charge distributor. Calculate the amount of deviation, the share of ore materials from the average specified value for this portion: Dp.M Dp.w - Dep,

where the deviation of the proportion of ore materials in the mixture from the average value specified for this portion; the proportion of ore materials in the mixture unloaded at a given position of the charge distributor;

Dpp is the average for a given portion of ore materials in a mixture.

If the total ore portion in the mixture is greater than the average value, then the mass of coke discharged at the same position of the distributor within the loading cycle is increased, and the mass of ore materials is reduced by UM, proportional to the deviation of the ore fraction in the mixture from the average value:

UM Me, d. And Dp., Where Kj, is the mass of a portion of the ore mixture

materials and coke, unloaded at this position of the distributor.

If the BLAST part in the mixture is less than the average value, then do the opposite — the mass of coke unloaded at the same position of the distributor is reduced, and the mass of ore materials is increased by the value of DM,

PRI and meer. Comparative tests of the operation of the furnace are carried out on the blast-stub by the proposed and known methods, In a blast furnace equipped with a chute distribution

Р 7-4 К 4-2 Р 7-4 К 4-2, Р ore

11286

 charge materials, ore materials, coke, a mixture of coke and ore materials are loaded. The boot cycle consists of, -. eight servings:

Р 9-5 С 8-6 Р 9-5 К 8-6 Letters indicate: materia; K - coke; C - a mixture of ores to Hbix materials and coke. The numbers characterize the work order of the charge distributor. For example, P-9-5 means that portions of ore materials are unloaded at five locations: 15, 9, 8, 7, 5. The mass of ore materials is 90 tons; the mass of a serving of coke is 25 tons; the mass of a portion of the mixture is 45 tons.

Average ore materials

20

25

35

0

five

0

five

in a mixture (Dpp) 0,444. At each position of the distributor, the odi-per-part portions of the portion unload, t, e, the portion during unloading is divided into as many equal parts by weight as the number of positions the distributor takes.

At each position of the distributor, the flow rate of the material is measured. For portions of coke and ore materials, the flow rate is constant at all positions of the distributor and is: for coke, 0.188 t / s; for ore materials 0.742 t / s. The mixture flow rate when the distributor is in the 8th position is equal to 0.411 t / s, in the 7th position, 0.559 t / s, in the 5th position, 0.332 t / s.

The proportion of ore materials in the mixture when the charge distributor is located is determined by expression (3):

a) in the 8th position D p (g, 0.402;

b) in the 7th position) 0.669;

c) in the bth position Dp ,,,, (g) 0,261.

Determine the deviation of the share of ores} of the 1st materials in each position of the distributor: tsikhty from the average value.: Yo, m (d). - 0.042; LVP m (7 0.225g Dp, M (6l 183,

Determine how much to change the mass of coke and ore materials:

A M; g | 0.63 t; D M (7) 3,375 t; IM (b | 2.745 tons)

Since in the loading cycle only one portion of the mixture, the total mass of ore mothers: vines, discharged 1 per cycle in the 8th position of the distributor, is increased by 0.60 t, in the 7th - reduced

by 3.3 tons, in - they increase by 2.7-tons, and the mass of coke unloaded during the loading cycle in the position of distributor is reduced by 0.60 tons, in the 7th it is increased by 3.3 tons, in - decrease by 2.7. m. For this, the fifth ore portion (P 9-5) and coconut portion (K) of the cycle are divided into unequal co, weight of part, i.e. when unloading a portion of P 9-5 when the charge distributor is in the position, unloads 18 tons of ore materials, 18.60 tons, 14.7 tons, 20.7, tons, 18 tons, and when a portion K is unloaded 8-6, when the charge distributor is in the 8th position, 7.73 tons are discharged, in the 7th position, 11.63 tons, in the 6th position, 5.64 tons.

The test results are shown in the table.

A comparative analysis of the proposed method shows the technical advantages of the method of distribution of the charge. Due to the increased gas utilization rate and the more kiln flow of the furnace when using the method, the coke consumption is reduced by 0.6 kg / t, and the productivity is increased by 0.5%,

Claims (1)

Invention Formula The method of loading charge materials into a blast furnace, including the supply of iron ore materials, coke and their mixtures with a given mass ratio to an intermediate bunker, measuring the flow of charge materials into the furnace during unloading from the bunker, distribution of materials over the cross-section of the hotplate trough distributor, carried out in cycles, characterized in that, in order to save coke and increase The productivity of a blast furnace, by increasing the degree of gas utilization, in the process of unloading a mixture of iron ore materials and coke from an intermediate bunker at each angular position of the tray, determines the proportion of iron ore materials in the mixture and changes this mass of coke and iron ore materials when this fraction is removed from the specified average value. , feeds in the feed cycle in separate portions at the angular position of the tray in which the deviation is fixed, by the value U.M determined by the expression AM m cm (DP.M- Dcp), Where M (, d - the mass of the mixture, loaded in the annular zone, t; D P - the share of ore materials in  the mixture loaded in the annular zone, t / t; D (jp - ass, anne average materials in the mixture, t / t, while with a positive value of this deviation increase the mass of coke and reduce the mass of iron ore materials, and with a negative value of deviation - vice versa. J " 55 65 DpeMS iC 1234 567 FIG. 2 eight 16 hc 32 89 room yrem, s. 48 56 ffV Yu