RU2344177C2 - Blast furnace charging device of tarasov - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention refers to iron and steel industry and can be implemented for charging of blast furnaces. The charging device contains successively assembled a receiving funnel with a charge gate, intermediary hoppers with gas-sealing valves and the charge gate and a guiding funnel with a central chute. A radial stationary charge distributor is installed at a throat; the distributor is made in form of a truncated cone with diameter of the upper cross-section constituting 1.1-1.2 of diameter of an outlet aperture of the central chute. A calibrator is installed in the outlet aperture of the central chute; the calibrator is designed to travel in a vertical plane. Diameter of the lower cross-section of the calibrator constitutes 0.93-0.96 of diameter of the upper aperture of the truncated cone.

EFFECT: facilitating uniform circumferential distribution of furnace gases and increased efficiency of furnace operation control.

2 cl, 1 dwg

Description

The invention relates to ferrous metallurgy and can be used to download blast furnaces.

Known designs of cone-free loading devices (CCD) containing a receiving funnel, two or one intermediate hopper with gas shut-off valves and burst gates, a guiding funnel with a central estrus, rotating trays, rotors, “slip” with a funnel, plates. See Bolshakov V.I. Theory and practice of blast furnace loading. - M.: Metallurgy, 1990 .-- 256 p.

Also known is the design of a conical loading device (ST) with a technological hole in the lower cone (TONK), containing a receiving funnel, a rotating funnel with supporting thrust rollers, a drive, a small cone with a hollow rod, a truncated large cone with a cylindrical shell of the upper section and a rod. See Satskiy V.A. The results of the blast furnace with a "vent" in the axial zone. / Satsky V.A., Tarasov V.P., Naboka V.I. et al. // Steel. - 2003. - No. 10. - p. 8-10.

The closest technical solution - the prototype of the blast furnace memory - is a BZU containing two receiving funnels, two hoppers, four poppet valves, two heat pipes, a guiding funnel, a shaft with a distribution disk and a drive mechanism, an oil seal with a bearing and a protective pipe to protect the shaft . See Zilberman A.A. Blast furnace distributor. - SU 178839 A, C21B 7/20, 11/03/1986. - 1-2 s.

The distribution of the charge through the narrow outlet of the guide cone-shaped funnel is a positive factor for a more uniform circumferential distribution of the charge materials on the top, however, the rotation mechanism of the disk is difficult to maintain and replace, using a rotating disk it is impossible to evenly distribute materials along the radius of the blast furnace and load the central zone, which , in turn, adversely affects the gas permeability of the mixture.

A blast furnace loading device is proposed in which, by changing the design form of structural elements, design simplification is achieved in terms of refusing a complex disk drive mechanism, increasing maintainability, increasing the uniformity of the circumferential distribution of furnace gases, as well as greater flexibility and efficiency in controlling the course of the furnace.

The present blast furnace loading device comprises a receiving funnel with a charge gate, intermediate hoppers with gas shutoff valves and charge valves, a guiding funnel with a central chute, in the outlet of which a calibrator is installed with the possibility of movement in the vertical plane, which allows changing the outlet between the calibrator and the central chute, wherein the loading device is equipped with a radial charge distributor in the form of a truncated cone located on the top, diameter emp lower section of the calibrator is less than the diameter of the upper opening of the truncated cone that is greater than the diameter of the outlet of the central heat.

In addition, the diameter of the lower section of the calibrator is 0.93-0.96 of the diameter of the upper hole of the truncated cone, which is more than 1.1-1.2 of the diameter of the outlet of the central heat, depending on the volume of the blast furnace.

The drawing schematically shows a General view of the memory of a blast furnace.

The present blast furnace loading device consists of a receiving funnel 1, the charge into which is poured from the skip 2. In the lower part of the receiving funnel 1 there is a charge gate 3. The cross over tray 4 directs the charge into the left or right intermediate hoppers 5, equipped with gas shutoff valves 6 and charge locks 7. The outlet of the central estrus 8 is blocked by a calibrator 9 provided with a hollow rod 10 connected to a drive (not shown) with the possibility of movement in a vertical plane. The truncated cone 11 has a rod 12, rigidly fixed on the site between the intermediate hoppers 5. The fastening of the truncated cone 11 with the rod 12 is provided by three powerful rods 13 located at an angle of 120 °. A funnel 14 with grooves 15 serves to load part of the coke into the axial zone of the top 16. The grooves 15 reduce the rate of coke falling and the formation of fines. The central estrus 8 together with the guide funnel 17 have a usable volume equal to the supply volume.

The operation of the blast furnace memory is as follows: the charge from the skip 2 is poured into the receiving funnel 1, where it is delayed by the charge gate 3. According to the program, the charge gate 3 is opened and the charge passes through the overflow tray 4 into one of the intermediate hoppers 5 (left in the drawing), where held by the charge gate 7 with the gas-cutting valve 6 open and closed 19. From the right hopper 5, the charge is poured into the guide funnel 17 and the central estrus 8, where it is held by the calibrator 9 in its upper position. Upon reaching the measure, the calibrator 9 lowers to its intermediate position and the mixture is poured along the fixed cone 11 to the periphery of the top 16. When the calibrator is lowered to the lower position, the part of the mixture through a narrow hole (100-200 mm) between the calibrator diameter (dk) and the diameter of the truncated cone ( Dk) falls into the center of the blast furnace.

Therefore, this invention, the loading device of the blast furnace has a more uniform distribution of the charge around the circumference of the furnace, against such a distribution of the prototype. It has the ability to widely change the radial distribution of the charge and furnace gases, provides a more complete use of the reducing ability and thermal energy of furnace gases. Using this invention, the blast furnace loading device in blast furnace production will significantly reduce the specific consumption of coke while increasing the productivity of blast furnaces. In addition, the maintainability of the new memory is increased, its design is simplified and the cost is lower.

Claims (2)

1. The loading device of the blast furnace containing a receiving funnel with a charge gate, intermediate hoppers with gas shutoff valves and charge valves, a guiding funnel with a central chute, in the outlet of which there is a calibrator with the ability to move in a vertical plane, which allows changing the outlet between the calibrator and the central estrus, characterized in that the loading device is equipped with a radial charge distributor in the form of a truncated cone located on the top In this case, the diameter of the lower section of the calibrator is less than the diameter of the upper hole of the truncated cone, which is larger than the diameter of the outlet of the central estrus. 2. The boot device according to claim 1, characterized in that the diameter of the lower section of the calibrator is 0.93-0.96 of the diameter of the upper hole of the truncated cone, which is more than 1.1-1.2 of the diameter of the outlet of the central heat depending on the volume blast furnace.