SU1465462A1 - Method of conducting melting in blast furnace - Google Patents

Abstract

The invention relates to ferrous metallurgy and can be used in blast furnaces operating with air blowing into the tuyeres of hot. reducing gases and hot blowing. The aim of the invention is to save coke for smelting iron. In the second group of tuyeres, in addition to hot reducing gases, technical oxygen is supplied, and in the first group of tuyeres, in addition to hot blowing, fuel additives, such as fuel oil, natural gas or pulverized coal. The amount of oxygen supplied to the tuyeres together with hot reducing gases is calculated from balance of oxidizers (0, CO-j. and H20) and ensure their equality in the lances of the first and second groups, where they enter as part of technical oxygen, hot blowing, hot reducing gases and fuel additives. The elimination of circumferential irregularities in the operation of a blast furnace provides an improvement in the use of eider in the furnace and the saving of coke spent on smelting iron.

Description

The invention relates to ferrous metallurgy, in particular to the domain production, and can be used to regulate the progress of blast furnaces.

The aim of the invention is to save coke by aligning the furnace course around the circumference.

The method is carried out in the following way.

Injection of hot blowing and hot reducing gas is carried out through two groups of tuyeres alternating around the circumference

ovens. Together with the hot reducing gas, technical oxygen is blown into the second group of tuyeres, and in the first group of tuyeres, in addition to

fuel additives, such as fuel oil, natural gas or pulverized coal, are introduced by blowing. At the same time, the amount of technical oxygen blown into the second group of tuyeres is determined by the balance of oxidizers (0, CO and H2.0) entering the first and second groups of tuyeres, ensuring the same oxidation rate of coke on all tuyeres of the blast furnace around O

SP iii.

about

1h9

nosti. This quantity can be, in particular, calculated by the expression:

one

W.

shopping center

{with.

V. - 0.9333.

Dd 40,622 (- (4) + 0,509 (CO) d - (CO,) ,,,

de

TK - consumption of TB of presidential oxygen, m / min;

CJfj (- content of 0 in technical oxygen, m3 / m;

60 — oxygen content in the hot blast, m3 / m;

Vn - the flow of what is blowing.

m / min;

Cj

D (n, o). ()

gwg

(C0a.) D weighted average mass content of non-oxidized carbon in quantitative additives kg / kg;

total mass consumption of fuel additives, kg / min; mass amount of moisture introduced by blast and fuel additives, kg / min; mass amount of moisture introduced by hot reducing gas, kg / min; mass amount of carbon dioxide introduced by fuel additives, kg / min; mass quantity of carbon dioxide introduced by hot reducing gas, kg / min. 1, Parameters according to 1200,

tg .1200 ° С, WITH 0.27 мз / мз, PG. 142 m3 / min, CK 271 kg / min, (0) "253, T 2076 c, V (p mz / min, Vr 1887 M / MMH /

In accordance with the extrusion (1), the flow rate of technical oxygen for the second group of tuyeres is determined, which in this example will be 253 m / min

(CO.)

1 gvg

Example

Howl tuyere group V,

cho

TC

those. with content

100% 0 "in technical oxygen).

0

Then C | 271 kg / min, which fully corresponds to the intensity of gasification of coke carbon in the first group of tuyeres. The remaining parameters of the temperature regime and the gas yield are established by known ratios, achieving full compliance with the determining parameters of the first group of tuyeres.

Thus, the parameters for the second group of tuyeres are: V. 1302 m3 / min, CO 38.5%, H, 15.0%

N,

46.5%, t.gr- 1226 ° C,

HZ CK

five

 271 kg / min, (O.) J, 253, T 2076 ° С, V 1808 Me / min (CO

 g 1887 b / min (C0 57.6%,

“2

 55.7%, H 10.8%, N 33.5%),

Vr

 10.3%., N2. 32, i:

0 The determining parameters of the blast furnace operation are the same for both groups of tuyeres, which indicates a complete alignment of the blast furnace running around the circumference, thereby improving the efficiency of reduction processes and saving coke.

Example 2. Accept new parameters for the first group of tuyeres:

0 Vft 1200 m3 / min, tg 1,200 ° C, CO 0.27 m / m 3, PG 110 m3 / min, C 288 kg / min, (O). 269 m3 / min, T 2194 ° C, V 1,744 m3 / min, (CO 37.2%, Hj 12.6%, 50.2%) Vf 1823 m3 / min, (CO 39.9%, H 12, 1%, N, 48.0%).

We achieve complete winding of the furnace along the circumference by determining new parameters for the second group of tuyeres: 1206 m / min (CO 38., 5%, Ig. 15.0%, N 46.5%),

five

0

TBG

 1286 C, kg / min, TC (0) to 269 m3 / min, at G, T 2194 ° C, UV 1744 m3 / min, (WITH

five

H

0

five

f 57.5%, Ng 10.4%, N 32.1%),

At 1823 m3 / min, (CO 59.3%, 9.9%, N, 30.8%),

In this example, the determining parameters of the blast furnace operation are the same for both groups of tuyeres.

In particular cases of blast furnace smelting with possible particularly high temperature of SHG in the future, in accordance with the invention, it can be implemented with supply of technical oxygen tuyeres to the second group together with fuel cells, such as natural gas. Then the consumption of technical oxygen op5

is determined by the expression of the native gas - by lime m.

Uniform circumferential gas flow and blast furnace consumption are adjusted to an additional 1.1% increase in specific coke consumption.

Claims (1)

Invention Formula The method of blast furnace smelting, which involves dividing air tuyeres alternating by the furnace circumference by two groups, the supply of hot blowing into the first group of tuyeres and hot reducing gas into the second group of tuyeres, the regulation of the theoretical combustion temperature, the yield and composition of the furnace gas and the intensity of coke burning before the tuyeres, m-h and h that, in order to save coke by aligning the furnace path around the circumference, fuel additives, natural gas, fuel oil or pulverized fuel are added to the first group of tuyeres, and technical oxygen is supplied without the second group of tuyeres.