SU1271878A1 - Method of controlling distribution of charge of blast furnace top - Google Patents

Abstract

The invention relates to the field of ferrous metallurgy, in particular to the domain production, and can be used to control the operation of blast furnaces. The aim of the invention is to reduce the specific consumption of coke for smelting iron by increasing the use of gas in the furnace. Achievement of the target determines the optimum level of embankment for each loading system used in the cycle. The feeds of each loading system are lowered to their corresponding optimum milling levels. The levels of the mound, which lower the next feeds in the cycle, differ from each other by the height of the order from 0.1 m to the value of the product (l-Kp) Hcp, where Hsr is average (L is the height of the layer formed at the top of the furnace feed, Kr skip hoist load factor.

Description

The invention relates to ferrous metallurgy and can be used to control the operation of blast furnaces.

The purpose of the invention is to reduce the specific consumption of coke by increasing the degree of gas utilization.

With a certain quality of batch materials and the blowing mode of each of the loading systems used on the furnace, only one optimal level of charge is formed, at which the maximum degree of gas utilization is achieved with an even discharge of the charge. On blast furnaces equipped with a skip hoist and cone-type loading devices, it is possible to implement cyclic loading with a number of loading systems in a cycle of no more than 2-4, which is determined by the number of programs for a set of charge materials provided by the controllers controlling the operation of the charge supply and charge loading mechanisms in bake. Lowering the pa3Hbix feed of the loading systems used in the cycle to different, but optimal gpm of these systems, the grains allows to get the maximum effect from the ore-ridge ore ridge along the top edge radius. In this case, the difference between adjacent values of the mound level. can be in the range from 0.1 m to a value that provides the time for the set of the next feed by loading mechanisms. This difference depends on the average height of an ingot bed formed at the throat by a single feed, the skip hoist load ratio (the ratio of the average number of feeds, sarpyHaehsbrx per kiln per day, to the theoretically possible number of feeds), and the number of values for the level of embankment used in the boot loop. With two values of the mash level, the maximum possible difference between them is determined by the ratio

-tr (1)

) / v “,

(N - DB

MQ.KC de ditsks

- the maximum possible difference between adjacent levels of the grist, m;

H

- average thickness of the layer formed by one feed, m;

the distance the surface of the embankment falls to during the time it is set on the large cone of the next feed, m; charge rate (m / h), which is determined from the expression:

(2)

V - Z. H / 24,

- average actual number of feeds, load 1x into the oven per day f

-minimal time for one feed, based on the theoretically possible lift performance (hour), which is equal to

24 / ZT, (3)

de zt

- the maximum number of feeds loaded into the furnace per day, corresponding to the theoretically possible lift performance, expressions (1), (2) and (3) are:

Of

A11 „a with (l-Z, p / Z) .H

(l-Kp) -H, (4)

where Ku is the load factor of the lift, equal to 0.5-0.6. Consequently, with two fillings of the embankment level, the maximum difference between them is equal to the product of the average feed thickness and the difference between the unit and the load factor of the lift.

The minimum difference between the successive positions of the bollard level is Lmin and, consequently, the step of its change is taken equal to 0.1 m, which corresponds to the Max-1 maximum possible measurement error of the bollard level from -1 to +5 m. The working value uh is chosen experimentally and is within

  DCH, chak11. . (five)

Claims (1)

If D Д mw, then 4h Ah | v is taken (t, and the optimal level is determined by dp prevailing in the loading system cycle. If three loading systems are used in the cycle, then the sequence is set so that the level of the bill will rise in two steps in increments h, the limits of which are defined by ratios (4) and (5X a) were lowered in one step by the value L h L h J and h j. Example, the Furnace is loaded on a 3KPPK 2PPRKi cyclic loading system with six stations of the charge distributor rotation (CPS). Level mist can take values of 1.2 2.5 m with a step of 0.1 m The delivery is equal to 1.12 m, the load factor of the elevator is 0.6, and then the maximum possible difference between successive positions of the level of the mound, determined from the expression (4), is Lmax (l-Kp) H "0.45 m. It is established by the route that with the existing charge quality, feed mass, blowing mode, etc., the optimal values for the backfill level for the CRRK and RRCC systems are respectively 1.6 and 2.0 m. The cycle starts at an angle of turn and then at the OPS. a large cone is blended in the sequence corresponding to the CRC system. When the mound surface reaches a level of 1.6 m, a large coius is lowered. The second and third feeds are dialed at the angle of rotation of the NRS, respectively, 60 and 120, respectively, in the same loading system and lowered to the same level as the first feed. The next two feeds are accumulated at the PWP angle of rotation of 180 and 240 ° through the RKPA loading system and are lowered into the furnace when the leveling surface reaches 2.0 m. Then the cycle repeats. As a result, pitches dialed into a large cone through the РРКК and КРРК system are lowered into the furnace at their constant and optimal for them mash levels equal to 2.0 and 1.6 m, respectively. After loading 30 feeds (5 feeds per cycle 6 stations), the distribution of materials around the furnace circumference is equalized, since each of the six sectors of the furnace top is loaded with two feeds of PPMC 2.0 m and three feeds each with КРРК 1.6 m. When applying the proposed loading method, due to the increased gas utilization, the specific coke consumption and decrease is the cost of cast iron. The method of the invention The method of controlling the distribution of the charge at the top of the blast furnace, which includes lowering the charge into the furnace in cycles of 6-24 feeds of at least two different loading systems at predetermined levels of bedding within 0.75-2.5 m, is different. So that, in order to reduce the specific consumption of coke by increasing the degree of utilization of gas, for, the feed rate of each loading system in the cycle is lowered. constant and optimal for this system, the mound levels differing from each other by a value from 0.1 m to 1 value of the product (l-Kp) .H (ip, where Hfo is the average height of the layer formed on the throat in one feed; K, - the load factor of the lift.