LU83402A1 - LOCK DISCHARGE SYSTEM FOR INDUSTRIAL OVENS - Google Patents

Description

i! «I lock discharge system for industrial furnaces j j The invention relates to a lock discharge system! for industrial furnaces, especially for working with overpressure! Direct reduction furnaces in iron smelting, with a first outlet channel, a first lock lock, 5 a pressure expansion tank, a second outlet channel and a second lock lock.

»In iron smelting, in addition to the blast furnace" with liquid pig iron as the main product of the furnace, so-called direct reduction furnaces are also known, in which the main furnace product 10 is sponge iron, which is fed to the steel mill for further processing, for example.

These direct reduction furnaces were previously operated at atmospheric pressure, which made their performance relatively low. If you want to increase its output with the same dimensions 15 of the furnace, operation with overpressure is appropriate, similar to the operation of modern blast furnaces, in which a relatively high overpressure is used. No particular sealing problem arises on the outlet side of the blast furnace, 20 since the sealing by the iron or slag melt! done itself.

In direct reduction furnaces, the situation is fundamentally different in this regard, since the furnace product, a lumpy and porous sponge iron, cannot perform any sealing functions. The iron sponge was previously removed by temporarily opening a closing element at the furnace outlet. So far, this final organ, i.e. in direct reduction furnaces operating at atmospheric pressure, e.g. consist of a simple, state-of-the-art curved swivel flap or the like.

However, if overpressure is to be used, “a lock discharge system must be provided in the direct reduction furnace, in which, in a known manner, two locks connected in series with one another with an intermediate * 2

Pressure compensation chamber can be opened and closed alternately.

Due to the overpressure operation, however, completely different requirements are placed on the furnace closure element (s) 5 as before, where this element only had a simple retaining function for the furnace product Temperatures have a long lifespan.

For hermetically sealed sealing, e.g. the above-mentioned curved swivel flaps at the pressures of approx. 3 bar are hardly considered, since the spatial course of the sealing surfaces practically makes it impossible for the sealing surfaces to lie exactly against one another. This is all the more so because the combined effect of pressure and temperature causes additional deformations on the flap and on the spout to be sealed off with it.

It is therefore the object of the invention to propose, starting from a lock discharge system of the type mentioned at the outset, a system in which an effective seal of the lock locks and a long service life of the lock system is guaranteed.

This task is, starting from a lock-25 discharge system of the type mentioned by the in

Characteristic of the main features listed solved.

An embodiment of the invention is shown in the drawings and is described in more detail below. Show it:

Figure 1, a longitudinal section through a lock closure between a furnace outlet and an intermediate container;

FIG. 2, a detail from FIG. 1 with a feed device for a locking medium for the seat of the lock lock.

h 3 i *

Figure 1 shows the outlet 4 of an industrial furnace, for.

B. a direct reduction furnace, a blanket with 6 designated bell lock as lock lock, and the 1 upper part of a pressure compensation container 8. At the outlet of the pressure compensation container 8, not shown 5, an identical bell lock 6 is provided, so that the two bell locks in connection with the pressure compensation container 8 a lock system for discharging the material obtained at the discharge funnel 4, for example Form sponge iron 10.

The actual closure is formed by a mushroom-shaped bell 10, which closes the lower opening of an outlet channel 14 by means of sealing surfaces 12. The bell 10 is carried by a support column 16 on 15 a crossbar 18, which is on both sides of the lower

Extremities of up and down movable operating rods 20, 22 is attached. These rods are passed through glands 24 for sealing.

According to the invention, effective cooling is provided for the main component of the bell closure.

For this purpose, the actuating rods 20, 22 are designed as hollow rods and a double coolant circulation is provided in their interior. A first coolant circulation occurs through line pipes 26, 28 which are axially guided through the vertical hollow rods 25 20, 22. After their vertical exit from the lower extremity of the hollow rods 20, 22, the line pipes 26, 28 are deflected twice at right angles and axially through the hollow support column 16 connected with cooling pipe coils 30 on the 30 inner wall of the mushroom-shaped bell 10. The - coolant, e.g. Water can be supplied through the pipe 26 and discharged through the pipe 28, or vice versa. This first coolant circulation accordingly provides j 35 for cooling the closing bell 10.

Λ A second coolant circulation ensures the cooling of the hollow bars 20, 22 and the crossbeam 18. Water, which e.g. enters at 32 and exits at 34 (or vice versa), crosses the annular space between the wall of the hollow rod 20 and the axially guided pipe 26, enters the lower part of the hollow rod 20 through radial through openings 36 and exits into the hollow 5 led traverse 18, traverses the latter and leaves it through radial openings 38 in the lower part of the hollow rod 22? after rising through the annular space in this hollow rod 22, the water leaves this second * coolant circuit through the connection 34.

10 A third coolant circulation ensures the cooling of the outlet channel 14. For this purpose, the outlet channel 14 is double-walled and the resulting annular space 40 is supplied with cooling water by supply and disposal lines 42, 44, 46, 48. The annular space 15 40 can be divided into several chambers, e.g. four be divided. In this case 42 is the inlet and 44 the outlet of one of these chambers, and 48 the inlet and 46 the outlet of another of these chambers.

Figure 2 shows a further feature of the closure 20, namely the supply of a barrier medium into an annular channel 50 in the outlet channel wall in the region of the seat surface 12 (Figure 1) between the closure bell 10 and outlet channel 14. This barrier medium, e.g. Air or an inert gas is fed to the ring channel 50 through a line 52 and serves to blow the bell out when the bell is closed

Sealing surface 12 and with the bell closed to support the bell sealing function and to cool the sealing surfaces.

Finally, it should be pointed out again- "30 that for the intended application as

Sluice lock only a bell lock with its simple, axially symmetrical shape can guarantee an optimal sealing effect.

/

Claims (3)

1. lock discharge system for industrial furnaces / in particular for direct reduction furnaces in iron smelting working with overpressure, with a first outlet duct, a first lock closure, a pressure compensation container, 5 a second outlet duct and a second lock · "· closure, characterized in that the locks locks ( 6) are designed as bell closures, with an essentially conical closing bell (10), that the closing bell (10) is carried by an up and down moving crossbar (18), lifting rods for lifting and lowering the crossbar (18) are designed as hollow rods (20, 22) that the cross member is also hollow and is connected to the inside of the hollow rods (20, 22) by means of through openings (36, 38) on the lower extremities, and that through inlet and outlet openings (32, 34) on the upper extremities of the hollow rods (20, 22) a coolant circulation through the hollow rods (20, 22) and the traverse (18) takes place that coaxial 20 pipelines (26, 28) run in the interior of the hollow rods (20, 22), which lead out of the lower extremities of the hollow rods (20, 22) and with pipe coils (30) the inner wall of the sealing bell (10) is connected, and that a cooling medium 1-25 circulation takes place in these pipes (26, 28) and the pipe coils (30), that the outlet channel (14) is double-walled and thus an annular chamber (40) is formed in which a coolant circulates through supply and disposal lines (42, 44, 46, 48). 2. Cooling system according to claim 1, characterized in that the annular chamber (40) is divided by vertical partition walls into several individual chambers, which are fed separately with a coolant. A «6 3. Cooling system according to claim 1, characterized by an annular channel (50) on the sealing surface (12) between the bell (10) and outlet channel (14) and by a supply line (52) through which the annular channel (50) with a blocking-5th medium is applied. fj ^ - '