SU1247421A1 - Shaft furnace charging arrangement - Google Patents

Description

This invention relates to ferrous metaplurgia, namely, equipment for shaft furnaces.

The aim of the invention is to reduce the consumption of coke by improving the uniformity of charge distribution at the top of the furnace.

Figure 1 shows the boot device of the shaft furnace, a general view of figure 2 is a section A-A in figure 1.

The device consists of a distribution tray 1, kinematically connected through gear Venda 2, swing and rotation drives relative to the furnace axis (not shown), as well as a cylindrical trench 4 installed coaxially with the furnace and connected by leakage to accumulating storage bins 5 and 6 equipped Blend valves 7 and gas tight 8 valves. Under chute 4, a throttle device is mounted, consisting of two vertically mounted shafts 9 and 10, to which via levers 11 are fixedly fixed funnels 12, made in the form of equally high hollow truncated cones having different angles (оС) of inclination and mounted so that the axis of each of them is displaced relative to the axis of the shaft to which it is attached by an amount (O, equal to the displacement of each of the shafts 9,10, relative to the axis of the furnace. Pass through the gland seals 13 and 14. Shafts 9, 0 are communicated through bearing assemblies 15, 16 with a boot 17 of the loading device and in the upper part are kinematically connected with individual turning drives (not shown).

The throttling funnels 12 are made with the following geometrical parameters: the diameter (D) of the inlet orifice, equal to the diameter of the central cylindrical trough 4, and the angles () of varying angles () of inclination.

The distance (h) between parallel planes passing through the edges of the inlets of the funnels 12 of the outlet of the cylindrical trough 4 is selected within 2-4 mm, which is necessary to ensure that the requested charge is sought through the gap during its supply from the lock bin to the distribution tray.

D7 / .21g

Transit device shaft furnace work in the automatic ring relasim. The tilt angle of the distribution of the gel tray 1 relative to the furnace axis (p) varies according to a predetermined program of eleven stations, with p sequentially changing after each complete rotation (360) of tray 1 at a constant angle and) is set to: (- , 194 22.8; 26.2; 29.6; 33; 36, 39.8; 43.2; 46.6; 50. The charge is injected into the baking oven in a manner that allows of the limiting tray 1 to the next station1-to exclude the supply of charge from the lock hopper to the lot.In the process of changing the angle of inclination of the tray 1 under the central cylinder One of the ten throttling funnels 12 is mounted coaxially with the frontal iron 4 front end (in Fig. 2, for simplification of the drawing, only six throttling funnels are shown.) For example, the installation under 25 chute 4 of one of the throttling funnels 12 mounted on the shaft 9 carried out in the following sequence. Initially, the shaft 10 is rotated to a position by means of a drive, in which the throttling funnels fixed on it will be out of the trajectory of the funnels of the shaft 9. After that, the shaft 9 is rotated through a drive bohosh-ash angle. Respectively

The eleven stations of the distribution tray 1 under the central groove 4 are alternately set de. C throttling funnels 12 (supplying the charge to the tray with the maximum flow rate is made directly from chute 4) with geometrical parameters (oCf, oi), allowing you to set the flow rate of the material fed to the tray equal to: 0.31 ; 0.39; 0.46; 0.52; 0.59; 0.66; 0.73; 0.80; 0.86; 0.93; 1.0 0, dd ,, where the maximum consumption of the charge. The optimal flow rates Q, -, corresponding to certain angles of inclination of the tray are determined according to the dependence 0 50 x 10 X Q «x

In the process of unloading the charge material from the airlock hopper with doses that are proportional to the angle of inclination of the tray (the dosage of the charge material is

3

by opening the blended valve for the corresponding lengths of time), it passes through throttling BqpoHKy 5, which has a round outlet, flows out of it with a jet that has the same cross-sectional area throughout the discharge (i.e., the charge flow to the tray, constant for the entire period of operation of the boot device at this station). As a result of this, on the surface of the bunker, a corner in the form of a body of rotation is formed by turning the distribution tray at an angle equal to 370-380 at this station. Such a uniform distribution of the charge on the cleaver is achieved by virtue of the fact that the volume of the dose and the expenditures are proportional to the angle of inclination of the tray. Since at each station in the initial and final periods of filing

material doses to distribution I

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According to the research, the tray varies from zero to a fixed value and vice versa, to obtain an equal thickness in the thickness of the annular zone, it is necessary for the material to be laid at the turn of the distribution tray at an angle of 370-380. At the same time, the part of the annular zone, which was not submerged by JQ in the initial period, is equalized in height due to the imposition on it of the part of the charge that is discharged in the final period with decreasing flow to zero.

Thus, using the proposed loading device, it is possible to achieve a reduction in coke consumption due to a more even distribution of the charge at the top, which leads to a significant improvement in the technical and economic indicators of blast furnace smelting.

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Editor M.Kelemes

Compiled by L.Paknikov Tehred V.Kadar Proofreader V.But ha

Order 4081/26 Circulation 552 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (1)

SHAFT FURNACE LOADING DEVICE, containing airlock hoppers, estruses which form a cylindrical groove mounted coaxially to the furnace, a throttle device located under it, consisting of two shafts mounted in parallel and kinematically connected to the shaft rotation drive with throttling elements fixed to them, a distribution tray kinematically connected with rotation and rolling drives relative to the axis of the furnace, characterized in that, in order to reduce coke consumption by improving the distribution uniformity Nia charge on the throat, the shafts are vertically offset with respect to the furnace axis, and the throttle elements are designed as hollow ravnovysokih truncated cones having different angles of inclination and generators. mounted on the shafts so that their axes are parallel and offset by the relative axes of the shafts by the amount of displacement of the shafts relative to the axis of the furnace. SU .1247421 1 I