SU908432A1 - Shaft furnace charging method - Google Patents

Description

(54) DOWNLOAD METHOD FOR MINE OVEN

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This invention relates to ferrous metallurgy, in particular to methods for charging blast furnaces.

There is a known method of loading a blast furnace with a charge distributor operating at n stations (p 4,6,8, etc.) within each revolution, the essence of which is that the supply of each regular batch of raw material to the sprucer sectors is carried out by successive rotation distribution funnel at an angle of 360 °: n 1.

The disadvantage of this loading method is the complexity of controlling the distribution of gas flow over the cross-section of the top, arising from the discrepancy between the qualitative (fractional) and quantitative (weight) crests of the charge material in one sector for each load portion due to the natural segregation by size and weight in the process of movement material on the sloping planes of the bottom of the skip and hopper receivers.

Obtained by this and other factors (the use of cyclic feeds

etc.) the uneven distribution of the charge has a negative effect on the quality of the distribution of the gas flow over the cross section of the furnace and requires the use of additional methods of influence on the course

5 furnaces from the top, which considerably complicate the work program of the charge distributor and the working conditions of the technical staff of the blast furnace.

The closest in technical essence and the achieved result to the proposed is a method of loading a blast furnace, including jetting the uneven supply of raw material to the bunker sectors by slowing down the speed of the continuously rotating distribution device above them within one or several turns 2. This method of loading is carried out by loading devices that include single-hole distribution funnel-troughs rotating around the axis of the furnace, and is intended to koloschnik zones with increased gas permeability by a large amount of raw material while simultaneously supplying it over the entire remaining area of the mound, in order to increase the uniformity of distribution and to use the energy of the gas flow in the furnace. The disadvantage of the device is the lack of its ability to ensure uniform distribution of the charge material over the cross-section of the furnace top. The purpose of the invention is to reduce coke consumption by increasing the energy use of the gas flow, achieved by uniform distribution of the charge material over the furnace cross section.

The goal is achieved by the fact that in the blast furnace loading method, including jet irregular supply, and ihtovy material in the throat sectors with speed deceleration of the continuously rotating distribution tray, the charge on the furnace top is produced by successively shifting the slower sector of the rotation of the distributor of the charge tray by the circumference of the furnace by an angle of 0.5 to 1.0 times the angle of the sector, which slows down its rotational speed. The improvement of the known method of loading a blast furnace leads to the fact that sequential mixing of the furnace furnace top sections with a large amount of material along the circumference of the mound provides a spiral loading with uniform and multiple alternation 0 of the furnace layers, the charge formed by the sectors with uniform feed of the loaded material at a constant and slower rotational speeds of the tray distributor. This improves the quality of distribution of the charge over the furnace height, levels its gas permeability, increases the use of gas energy, and hence the technical and economic indicators of blast-furnace smelting. The method for charging the blast furnace is as follows. When each regular batch of PIECE material is fed to the throat sector, receiving a large amount of charge, by slowing down the speed of the continuously rotating funnel-trough above it, sequentially and uniformly shift the circumference of the bollard by an angle of 0 °, a multiple of 0.5-1.0 the angle of this sector. The proposed values of the limits (0.5-1.0) xK, where K is the angle multiplicity factor / 3 °. The displacement of the delayed-sector sector of the charge distributor speed is selected based on the condition of providing the largest possible number of furnace loading modes, taking into account the different nature of the change in the magnitude of the adopted rotational speed of the funnel chute. The factor of multiplicity K of the angle D ° of the mixing of the sector cL ° is a positive integer, the approximation; displacement of each subsequent sector of deceleration relative to the previous one within the length of the circumference of the circle by ft ° (0.5-1.0) xo (° xK, where K - is taken less than any integer number if you divide 360 ° by the remainder.

In the process of changing the speed of rotation of the tray, which includes equal time periods of soft deceleration of the funnel and a mantle from a set of 1 K 360 °: 2ad °, it allows to dry the furnace loading modes, including sequential mixing, of the slowdown sector of the distribution funnel angle (0.5-l, 0) -ot °, with a slow-down sector shifting along the top of the circle, similarly to the operation of the McKee allocator according to the p-station program, by an angle (0.5-1.0) for the K value smaller than any integer obtained when dividing 360 ° by 2 ° (. ° without further accelerating it to the initial speed value, a successive displacement of the deceleration sector is carried out by an amount of ° equal to half the angle oi °. Under a speed variation mode that includes periods of single-stage deceleration, rotation of the funnel at a reduced but constant in magnitude over the selected sector throat and stepped acceleration of the funnel to the initial value of the speed, the consecutive mixing of this sector is produced by the value of D ° equal to the angle L ° of the deceleration sector. The received values of the multiplicity of the selected value of the deceleration sector displacement; 9 ° (0.5-l, 0} xoL ° xK do not ensure a uniform distribution of the thickness around the top of the furnace, as this results in a partial overlap of one portion over another 3br: 2 ° supply of a large amount of material is carried out to the slow-moving speed sectors located in two diametrically opposite points of the throat’s circumference, creating a significant circumferential uneven distribution of the shield over the furnace section. One example is of the invention can serve as a method of supplying the charge to a pile, n-ik, in which the charge distribution of the charge produces a consecutive displacement of a sector with a speed deceleration angle equal to / j ° 48 ° in the feed cycle through an angle of 1 ° D ° 48 °, a multiple of J. ° C the multiplicity of K I. An example of the implementation of the proposed method can be the reception of the work of the charge distributor, producing a sequential displacement of the sector of slowing down the speed of rotation of the funnel.

° 48 ° in the feed cycle at an angle oi ° 144 °, a multiple of an angle; 3 ° 48 ° with a multiplicity of K 3. Thus, the proposed method allows to improve the quality of distribution of the charge material over the furnace cross section and thereby improve the technical and economic performance of the blast furnace ovens.

Claims (2)

1. Gotlib, A. D. Blast process. M., “Metallurgists, 1966, p. 503. 2. USSR author's certificate in application number 2599495, cl. From 21 to 7/18, 1978.