SU910771A1 - Charge spreader of blast furnace loading arrangement - Google Patents

Description

(5) DIFFERENTIAL TREATMENT CHARGE DISTRIBUTOR OF THE LOADING DEVICE

one

This invention relates to ferrous metallurgy, in particular, to the equipment of blast furnaces.

Known boot device, blast furnace, including sluice hoppers, single-slope funnel, mounted on a hollow rod and installed under it distributive truncated cone with forming different lengths, mounted on the drive rod 1.

The disadvantage of this loading device is the inadequate distribution of the charge material at the furnace top across the width of the annular layer due to the fact that during the formation of the surface of the backfill, the charge is positioned with a narrow ring ridge. This happens because the material is poured from the surface of the guide (forming) distribution cone with a thin and narrow stream. Multi-ring loading is performed by changing the position of the axis

the outlet hole of the shed relative to the base point (generatrix) on the surface of the truncated cone, which complicates the radial distribution control system over the furnace cross section, increases the time (several revolutions of the funnel) to achieve overall uniformity, and this leads to a deterioration of the technical and economic indicators of blast furnace smelting.

ten

The closest in technical essence and the achieved result to the proposed is the charge distributor of the loading device

IS of a blast furnace, containing an intermediate hopper with a chute installed coaxially with the furnace on its dome, and a distribution element kinematically connected to a rotational drive

20 cone with apex 2 offset from its base axis.

However, this device does not provide high-quality radial and district distribution of the charge over the cross section of the furnace.

The aim of the invention is to improve the circumferential and radial distribution of the charge and increase the reliability of the work.

This goal is achieved by the fact that the charge distributor, which contains an intermediate hopper with a chute, mounted coaxially with the furnace on its dome, and connected kinematically with a rotational drive distribution element in the form of a cone with a tip offset relative to the axis of its base, is fitted with a roller-supported ring connected by rigid tg with a distribution element, the apex of which is offset from the furnace axis by 0.1-0.2 of the internal diameter of the chute, and the angle of inclination of the cone forming to its base with a diameter of 0.25-0.30 in diameter The furnace furnace trap varies from to B5 75. The displacement of the apex of the distribution cone relative to the axis of the base is necessary so that the length and angle of inclination of its constituents smoothly vary from maximum to minimum. This contributes to the formation of a uniform ring ridge with a width equal to the difference between the projections of the maximum and minimum lengths of the distribution cone forming on the horizontal plane during the period of rotation, taking into account the charge dumping trajectory. which is formed due to the different angles of inclination of the cone-forming (the greater the inclination of the cone-forming, the greater the higher the speed of the material rolling over it),

The drawing shows the proposed distributor of the charge of the blast furnace.

The device consists of a distribution element 1, made in the form of a cone with its base displaced relative to its axis, with a diameter equal to 0.25-0.3 of the diameter of the top furnace. The angles of inclination of the forming distribution cone 1 are in the following limits; 32 oL -i AO and 65 ° (L 75. Distribution cone 1 is set so that

its tip is offset relative to the furnace axis by an amount equal to 0.1-0.2 of the inner diameter of the cylindrical trough d (0.1-0.2) D and is connected by means of rigid bars 2 to the ring 3 supported on rollers k and connected by means of gearing with rotational drive 5. A coaxial blast furnace 8 is mounted on its dome 6, which is supported on the walls of the throat 7, and connects to the intermediate hoppers 9. The rotational drive 10 of the support ring 3 and the bearings

The rollers 11 are located outside the working area of the furnace. The rotating units are protected from dust and hot gases by the screen 12.

0 Distribution cone 1 is made so that the angle of its generators varies from to b575. At the inclination angle cL 32 forming the charge material does not roll freely from the inclined surface of the cone, since the angle of repose of the charge is 28-32 °. In this case, the material converging from the cone loads only the central zone of the furnace's top furnace as it rolls off forming, the angle of which i / 32. When loading the peripheral zone, it is necessary to significantly increase the height H of the cone B, which completes the design. . Provided that (f the charge material is freely discharged from the surface of the generator and enters the peripheral, top zone,

- while the height H of the distribution cone is negligible. At fi 65, the charge material, converging from the cone, falls into an intermediate zone located between the central and peripheral zones, which does not allow the central zone of the furnace to be loaded. With

P 75 and / ichtovy material (fines and large particles), converging from the cone, falls into the zone of the furnace top, directly adjacent to the central one. For an even course of the furnace, it is necessary to load large pieces of the charge closer to the center, so at a tilt angle of a material forming 65 5 75 ° (fine material and large particles)

Claims (2)

 enters the zone of the furnace's head, which is located at some distance from the center, which makes it possible for large pieces to roll down the slope and concentrate in the central zone of the furnace. The diameter d of the base of the distribution cone is chosen so that the charge material converging with the generator having the maximum length (with the displacement axis of the axis of the base or the cone relative to the axis of the blast furnace charging unit) loads the peripheral zone of the head. Therefore, d {0,25-0,3) 0, where O is the diameter of the top of the blast furnace. Pr values of d 0.250 material, converging from the cone, does not fall on the peripheral zone of the furnace top, and when d = 0.30, the charge hits the wall of the furnace top, destroying them and re-crushing. At 0.250 d 0.3, the material converging from the cone to the displacement of the axis of the base of the cone relative to the axis of the blast furnace and the trajectory of the particles, loads the peripheral zone. Due to the displacement of the top of the distribution cone by h, the value B 0.1–0.2) dj relative to the axis. The material, which desires from the cone, has a constant specific flow through the section. The distributor of the charge of the blast furnace works as follows. The shutter of one of the chutes opens and the charge enters the vertical cylindrical chute in a quantity greater than the flow rate from it, and then hits the surface of the distribution cone with an apex offset from the base axis, which continuously rotates with a drive at a constant speed. The length and angle of inclination of the distribution cone constants smoothly changes from maximum d to minimum, which contributes to the formation during the period of rotation of a uniform annular ridge, the width equal to the difference between the projections of the maximum and minimum cone constants on the horizontal plane taking into account the trajectory Ssypani charge. Thus, due to the chosen parameters of the distribution cone (32 ° 4 01 (40 °, 65 (L i 75 °. D (0.25-0.3) 0) and mixing its vertices by the value (O, 1-0.2 ) d9y (, charge material flowing out of a vertical chute, evenly flows around the cone, forming a wide circular horizontal ridge on the head plate. This makes it possible to achieve maximum circumferential and radial uniformity over the cross section of the blast furnace in one turn of the distribution cone. Design of the proposed distributor improves the quality of distribution of charge materials materials for cross-section of the furnace and thereby improves the technical and economic performance of the blast furnace, and also increases the reliability of the invention. Claim distribution distributor of the blast furnace charging device containing an intermediate hopper with a chute installed coaxially with the furnace on its dome and kinematically connected with the drive rotational distribution element in the cone type with the apex shifted relative to the axis of its base, characterized in that, in order to improve the distribution of the charge over the cross-section of the furnace top and increase reliability, the distributor is equipped with a ring supported on rollers, connected by means of rigid pipes with a distribution element, the top of the cone of which is offset from the furnace axis by 0.10, 2 of the internal diameter of the chute, and the angle of inclination of the cone to its base with a diameter of 0.25 0.30 the diameter of the furnace top varies from about 65 to 75 degrees. Sources of information, rintye taken into account in the examination 1. The author's certificate of the USSR 662587, cl. From 21 to 7/20, 1979. 2. USSR author's certificate on the application N 2 1215 / 22-02, l. From 21 to 7/20, 1976.