SU1527268A1 - Method of melting in blast furnace - Google Patents

Abstract

The invention relates to ferrous metallurgy, in particular to the domain production, and can be used to optimize the loading of the charge in the furnace. The aim of the invention is to increase the productivity of blast furnaces and reduce coke consumption by reducing the uneven distribution of the charge around the furnace circumference. To do this, furnaces that operate using loading cycles, which include two systems, whose feeds are loaded to optimal for these systems, charge the charge, are charged with half feeds corresponding to the two loading systems. Each half feed is loaded at a mound level that is optimal for a given loading system. Both half feeds of the same loading cycle are lowered into the furnace at the same station of the rotating charge distributor. 1 tab.

Description

The invention relates to ferrous metal, in particular to domain production, and can be used to control the operation of domain furnaces.

The aim of the invention is to increase the productivity of the blast furnace and reduce the coke consumption by reducing the uneven distribution of the charge around the furnace circumference.

The method is carried out as follows.

A six-roll feed of the AAKKKO or KKOAAK type is installed on the furnace and divided into two half feeds, which are lowered from the large cone to constant and optimal levels, for example AKKi 1, 75 m, KKOi 1, 0 m or KKO 1, 0 m.

AAKi 1.5 m, (A, K, O - respectively, the designation of skips of sinter, coke, pellets, - the designation of the lowering of a large cone; 1.75; 1, 0 and 1.5 m - the levels of mound, on which the corresponding semi-feeds are lowered). The first batch of material consisting of three AAC skips is lowered onto a large cone when the distributor is operated at a station of 30 ° and loaded into the furnace at a level of 1.75 m of the mound, the second batch of material from three skips KCO is lowered onto a large cone 30 ° and loaded into the furnace at the level of mound I, 0 m. The next batch of charge materials are similarly loaded at 60, 90, etc. depending on the quantity

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work stations of a rotating charge distributor. Thus, the cycle of change in the level of the embankment, the type of system and the mass of the coke oven is completed in

the volume of one feed and at one station of the work of the distributor, which reduces the uneven distribution of the charge around the furnace circumference with cyclical changes in the level of the mound. For each type of pick-ups on each furnace, it is established experimentally, with the existing batch quality, feed mass, blowing mode, etc., the optimum values of the mound level.

Example. On a 2000 m blast furnace, the furnace was loaded with a rotating charge distributor (CPP) 6 stations O, 60, 120, 180,

240 and 300. The loading system is cyclic: ZAAKK, 2KAAK, milling level 1.75 m, ore feed rate 29.0 tons of coke coal, 8.1 tons. The furnace smelted 3646.5 tons of pig iron per day at a specific coke consumption of 511.9 kg / t. The performance of the furnace is shown in the table.

At the same time, the number of VRS work stations installed on the furnace was a six-split split feed with a load of samples for different levels: KCO 0.75 m, AAK4 1.5 m, ore feed size 49.2 t, coke charge 13.5 t. At the station of 30 VRSh, the KKO sub-supply is loaded onto a large cone and, at a level of 0.75 m, it is lowered into the furnace. At the same station, the CPP is loaded on a large cone with a half-feed AAK and, at a mile level of 1.5 m, the opus

Cabin her in the oven. At station 60, the next feed KKO semi-feed is loaded onto a large cone and at a level of 0.75 m of embankment, it is lowered into the furnace, then the second AAA second semi-feed is lowered into the furnace at the same station; , etc. at all VRS stations. The cycle of level change is completed in the volume of one supply and at one station of operation of the distributor.

The use of the invention makes it possible to reduce the uneven distribution of the charge materials around the furnace, to improve the use of thermal and reducing energy of the gas flow, to reduce the coke consumption and to increase the productivity of the blast furnace.

Claims (1)

"Invention Formula The method of blast smelting, which includes loading the furnace into the furnace by cycles by rotating the charge distributor and using two different loading systems, the feeds of which load the levels of the charge to the constant and optimum values of these systems, in order to increase the furnace productivity and reduce coke consumption by reducing the uneven distribution of the charge around the kiln circumference, the cycles of changing the level of the pellet, the type of loading system and the mass of the coke wall are carried out in the feed volume and at one station of operation limiter charge. Indicators Periods Blowing: consumption, m / min 35643683 pressure, kPa28528 temperature, C11261138 Consumption of natural gas, m / t123,4119.2 The oxygen content in the blast,% 28,028, Top gas: pressure, KPa159150 temperature, С430400 content,%, 919.3 СО25,925,9 from 7,56,9 CO0,4210,427 Analysis of cast iron,%: Si0.730.73 Mp0,550,59 S0.0280.027 Р0,0500,052 Fe content in the iron ore portion of the charge, Z55,6955,58 Slag yield, kg / t of pig iron393,2385.0 Consumable coefficients 1 kg / t of cast iron: YuGOK149,35 NKGOK-11002,51137.0 pellets 722,649,0 known for 69,539 Downtime% 0.16 Silent move,% 0.32 The quality of raw materials (FR-5),%: YuGOK19,7919,76 NKGOK-114,9814,19 average 5,214,92 Weighted average, Fr -5,%. 1 1.5910.84 Coke quality,% ash10,4410,57 sulfur1,631,52 , 4490.39 M, o6,196,10 Compiled by G. Shepelev Editor O. Yurkovetska Tehred M. DidykKorrektor S.Cherni Order 7483/35 Circulation 530 Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Using the invention