SU721493A1 - Method of blast furnace charging - Google Patents

Description

The invention relates to ferrous metallurgy, in particular to methods for the district distribution of the charge on the top of the blast furnace. There is a known method of distributing the batch at the top of the blast furnace by continuously rotating a single-sided distribution funnel installed above a sealed chamber that is locked by four sealing valves 1. In this method, the charge is charged with open apertures of the gas shut-off valves and continuous rotation of the funnel. A significant disadvantage of this method is the presence of qualitative uneven distribution of the charge on the cones and the top of the blast furnace: under the holes, crests of material are formed in which small fractions are concentrated in large quantities, and between them there are more large pieces of charge. In addition, it is possible konkrenne. Bleed out at the outlet of the rotating funnel, which could lead to an accident at the top. The drawback of the device is that the valve holes are concentrated with a large amount of charge in a year, and during the loading cycle of the skips or by; 1 The nature of the qualitative distribution of the charge does not change — more large pieces of the charge are concentrated under the valve holes, and between them - small. The closest to the invention to the technical essence and the achieved result is the method of loading a blast furnace with a dual-slope funnel located above the double cone loading device with a sealed chamber above the upper cone closed by four valves by rotating the funnel clockwise and counterclockwise 2. In the loading mode by station The dual-slope rotating funnel is installed so that its opening is aligned with the two valve openings of the additional sealed chamber (corresponding to m gazootsekayuschie valves open during loading). The mixture, poured from the skip, falls into the receiving hopper, then into the rotating dual-pitched hopper, and from it is poured onto the upper cone. Designs with four gas shut-off valves and a dual-slope rotating funnel have two stations of operation of the rotating funnel; with one of them, the holes of the double-slope funnel are combined with one pair of valve holes, with the second - with the other pair. When the dual-slope funnel is operating in continuous rotation mode, all gapped open valves are opened, and the dual-slope funnel is continuously rotated until it is completely scooped onto a small cone. A significant drawback of both modes is the presence of a qualitative uneven distribution of the charge around the collar bur of the blast furnace, caused by the segregation of the material that occurs when it is poured through the valve holes. As a result of the qualitative unevenness of the circumferential distribution of the mix, the distribution of the gas flow over the cross-section of the throat deteriorates, which in turn leads to a loss of iron production and coke overrun.

The purpose of the invention is to improve the quality of the district distribution of the charge at the furnace top.

This goal is achieved by the fact that in the known method of loading a blast-furnace with a dual-slope funnel, the loading of the charge is carried out in cycles, each of which includes loading in a continuous rotation mode of the funnel in both counterclockwise and loading at both stations.

With this method of circumferential distribution of the charge, the alternation of modes leads to the best compensation for the qualitative irregularity inherent in each mode separately. This effect is possible due to the following circumstances. When loading in the continuous-rotation mode of the dual-slope funnel, the fines are concentrated in the throat sectors located directly below the valve holes. Coarse fractions in greater numbers are in the sectors between them. When loading by station, the opposite pattern is observed in the distribution of fractions.

FIG. 1 shows the boot device, a general view that implements the proposed method; in fig. 2 shows section A-A in FIG. one.

In practice, this method of district distribution of the charge is carried out as follows.

214934

In the first supply, the charge is transferred from the skips to the receiving funnel 1, from which it enters the dual-sloped funnel 2, which is continuously clockwise rotating. to the upper cone 4, from which it is overloaded to the lower cone 5, and then to the top furnace of the 10th furnace. The second feed load with the continuous rotation of the dual slope funnel 2 counterclockwise. The third feed is loaded onto the first station, when the holes of the dual-slope funnel are aligned with the valve openings A, B of the sealed chamber 3. The corresponding valves are open during loading. The fourth feed is loaded onto the second station (the holes of the dual-slope funnel are aligned with the valve holes 20, B, D). So, one cycle includes loading in a continuous rotational funnel clockwise and counterclockwise, and loading both stations. Then the cycle is repeated. Method of loading blast furnace blast furnace

25 funnels according to the invention will improve the technical and economic performance of blast-smelting.

Claims (2)

1. Loading devices of foreign blast furnaces. Information of CIINCHM, 1973, no. 3, ser. 4, s. 9-10. 2.Tarasov V.P. Loading devices of shaft furnaces. -M., Metallurgists, 1974, with. 203-204. . Kokoshnik ceKmoptu FIG g