EP0562701B1 - Spray-cooled cover - Google Patents

Abstract

A spray-cooled furnace cover or roof from which the coolant is removed by gravity flow without the use of any pumps. The roof has lower coolant consumption than roofs requiring Venturi pumps to remove water.

Description

The invention relates to a spray-cooled lid for tiltable metallurgical vessels.

Such lids are placed on the furnace vessel and remain there during operation. They do all the movements, especially the tilting of the vessel. In certain operating phases, for example when loading, the lid is lifted from the container and swiveled to the side.

These cover positions, which differ from the normal position, are of particular importance for the coolant supply and removal for spray-cooled covers. A spray-cooled cover is known from US-A-4,715,042, in which the cooling medium is sucked off by means of venturi pumps. In practice it has been shown that this type of pump is not able to draw off large amounts of coolant. In special cases, water collects in the lid, so that instead of spray cooling there is normal water cooling with the negative effect that overheating of lid parts can occur in this area.

A spray-cooled lid is known from US-A 47 89 991 (on which the preamble of claim 1 is based). which use disc pumps that are able to draw off large amounts of water. In addition, they are suitable, even after a possible dry run, which means if the water thread on the suction side breaks off, to resume operation undamaged. These pumps are connected to the spray-cooled cover by hoses and thus allow the cover to tilt. To swivel the cover, it is necessary to detach these hoses from the cover using quick-release couplings. As a further disadvantage, it should also be mentioned that in the known supply and discharge of the cooling liquid, not only pumps for the spray water, but also externally driven pumps for the suction of the cooling liquid are required.

Reputation of the invention is to create a spray-cooled lid of the type mentioned, in which a safe supply and removal of the cooling liquid in any position of the lid is possible in a structurally simple manner without the use of external energy.

The invention solves the problem by the features of claim 1.

To discharge the coolant, which is supplied to the cover by pumps and collected in a channel provided at the edge of the cover via spray nozzles on the underside of the cover, two discharge lines are provided, which are guided in parallel for most of their distance and in a common transfer station of the coolant to the factory network. The transfer station is at a distance from the lowest possible operating point of the cover, so that a reliable drainage of the cooling medium is guaranteed by gravity. The use of suction pumps is therefore unnecessary.

The cooling medium in the lid is sucked off at two points, e.g. at the intersection of the center axis of the cover and the edge area, pointing once to the racking and once to the deslagging door.

For this purpose, a tunnel is provided in the groove provided on the outer edge of the cover, which ends in a trunk-like shape at the apex of tapping or slagging and is connected at the other end to pipes arranged on the edge of the cover. These drain pipes are designed as square pipes in the area of the cover, since this ensures that the floor is level with the apex of the channel and that the cooling medium can flow away safely.

The square tube, which serves to drain the cooling medium from the area of the tapping side, is arranged parallel to the tilting axis in the area of the top of the cover, which faces the tapping hole. This makes it possible, in the tilting position “tapping”, to allow the water collecting in this tilting position to flow away safely in the area of the top of the lid.

The drain line, which is connected to the top of the lid facing the slag flap, is designed as a square tube, so that the area in which it is connected to the edge of the lid is box-shaped. The center of this box coincides with the tilt axis. The box extends in the direction of the slag side of the lid and is therefore suitable for removing cooling liquid from the lid side of the slag side over a wide tilting angle range of the lid via the suction tunnel. Pointing away from the slag side, the square tube is inclined at an angle to the transfer station. The ratios of the gutter depth of the cover and box size of the drain pipe are chosen so that the coolant in the Deslagging phase is safely conducted away from the lid without water being able to accumulate outside the channel.

The cooling water discharge is designed so that not only the tilting movement of the cover, but also the pivoting away without interrupting the water supply and drainage is possible.

To this end, essential parts of the cable routing are formed from hoses that can absorb torsions and bends without damage. For this purpose, hoses are provided which are connected at one end to the cover drain pipes and at the other end are rotatably mounted on a swivel arm. If the lid tilts, be it in the parting or deslagging direction, this movement is carried out without moving the swivel arm. When the cover is pivoted, the swivel arm is moved in a manner comparable to the movement of the cover support arm and thus enables the cover to be pivoted with the hoses connected. The movement of the swivel arm tip is in turn compensated for by another hose, which is connected via swivel joints to the final piping of the discharge line, which is connected to the transfer station of the cooling medium to the plant network. Depending on the design and utilization of the geometric relationships, i.e. So arrangement of the swivel column and length of the swivel arm, it is possible to swivel the lid with the connected cooling water supply so far that the furnace vessel can be completely released.

• Fig. 1 eine Übersicht einer Ofenanlage,
• Fig. 2.1 einen Deckelschnitt,
• Fig. 2.2 eine teilweise geschnittene Ansicht A aus Fig. 2.1,
• Fig. 3 eine Deckeldraufsicht,
• Fig. 4 die Kinematik einer Deckelschwenkung als Draufsicht,
• Fig. 5 die Kinematik einer Deckelschwenkung als Seitenansicht.

An example of the invention is set out in the accompanying drawing. Show it:

• 1 is an overview of a furnace system,
• 2.1 a cover section,
• 2.2 shows a partially sectioned view A from FIG. 2.1,
• 3 is a top plan view,
• 4 shows the kinematics of a cover pivoting as a top view,
• Fig. 5 shows the kinematics of a lid pivoting as a side view.

1 shows an overview of a furnace position with a metallurgical vessel 10 which has a tilting device 11 with which the vessel can be brought into the parting-off position 12 with a low-lying tap opening 14 and into the position of deslagging 13. The tilting angle during parting off is denoted by "α" urid and that when deslagging is denoted by "β". The metallurgical vessel 10 can be closed with a lid 20 by means of a lid lifting device 15. The lid lifting device 15 can be pivoted away from the furnace vessel 10 via a lid rotating column 16 (shown in FIG. 4). Drain pipes 31 and 41 are arranged on the cover 20.

2.1, 2.2 urid 3 show the lid in section in a partial view and in plan view. The lid 20 has a lower lid part 23 and an upper lid part 24, between which spray elements 21 for spraying coolant are arranged. The lid edge 22 is designed as a groove 25, within which a partition 26 and a hood 27 are provided. The partition wall 26, the hood 27 and the lid edge 22 are joined together as a tube which extends from the tilting axis Ii in the direction of the tap opening 14.

At right angles to the pivot axis III, a drain line (tap) 30 is provided, which has a drain pipe 31 which is designed as a square pipe 32 near the cover.

Starting from the edge of the cover in the region of the tilting axis II tangentially, a drain line (slag) 40 is provided, which has a drain pipe 41 which is designed as a square pipe 42 near the cover. Couplings are provided on the drain pipes 31, 41, etc. the coupling pieces 61 and 62.

4 and 5 show the kinematics of a lid pivot, u.z. as a top view and a side view. The lid 20 is pivoted away, for example during the loading process, into the position 20 'from the vessel 10 with its tapping 14. The drain pipes 31 and 41 including the coupling pieces 61, 62 are also pivoted. When using the cover rotating column 16 as a swivel device 80, this swivel movement is also carried out by the swivel arm 83, so that the connecting hoses 33 and 43 and the coupling pieces 64 and 65 swivel at the same speed and at the same angle. The connecting hoses 35, 45 arranged between the head end 81 of the swivel arm 83 and the rotary joints 36, 46, which are fastened to a discharge pipe 47, absorb this movement elastically. When swiveling the cover, no hose connection needs to be loosened.

The discharge pipe 47 opens into a transfer station 70 which has a transfer container 71 which is connected to a plant network 79. The transfer container is at a distance c from the lid.

On the cover 20, an inflow line 50 is arranged, which consists of an inflow pipe 51 and an inflow hose 53.

Position list

10th

metallurgical vessel

11

Tilting device

12th

Parting position

13

Position deslagging

14

Tap hole

15

Lid lifting device

16

Cover rotating column

20th

cover

21

Spray elements

22

Lid edge

23

Lower lid part

24th

Lid top

25th

Gutter

26

partition wall

27

Hood

28

Partition

30th

Drain pipe racking

31

Drain pipe

32

Square tube

33

Connecting hose

34

Pipe piece

35

Connecting hose

36

Swivel

37

Discharge pipe

40

Drainage pipe slag

41

Drain pipe

42

Square tube

43

Connecting hose

44

Pipe piece

45

Connecting slag

46

Swivel

47

Discharge pipe

50

Inflow pipe

51

Inflow pipe

53

Inflow hose

60

clutch

61

Coupling piece 31

62

Coupling piece 41

63

Coupling piece 51

64

Coupling piece 33

65

Coupling piece 43

66

Coupling piece 53

70

transfer station

71

transfer container

72

transfer pumps

79

Works network

80

Swivel arm device

81

Headboard

82

Swivel column

83

Swivel arm

Claims (10)

1. Spray-cooled cover (20) for tilting metallurgical vessels, from which this can be raised and swung away, with a circular top and bottom part, the faces of which are disposed in parallel, spray elements (21), which are disposed between the top and the bottom part and connected to a coolant supply, and a coolant drain, which can be connected via two parallel discharge lines (30, 40) to a delivery station (70) for delivering the cooling liquid to the plant network (79), wherein a channel-like depression (25) is provided at the edge of the bottom cover part, characterised in that a first discharge pipe (40) is connected to the channel-like depression (25) at the point of intersection with the tilting axis (II) of the cover (20), which pipe is bent downwards tangentially from the cover edge at an angle "γ" which corresponds at least to the angle of tilt of the vessel, that a second discharge pipe (31) is connected to the part of the cover (20) which is inclined towards the tap hole (14) parallel to the tilting axis (II), which pipe forms an angle "δ" with the cover edge, that the part of the discharge pipes (31, 41) which is connected to the channel-like depression (25) is formed as a square pipe (32, 42), that mouths of the discharge pipes (31, 41) which are of like construction and provided near one another comprise coupling parts (61, 62) to which connection hoses (33, 34) can be coupled, and that the discharge pipes (31, 41) are connected to the delivery station (70), which is disposed at a vertical distance (c) from the lowest position of the tilted cover (20) which ensures that the coolant will flow off due to the force of gravity, with all resistances being taken into account.
2. Spray-cooled cover according to claim 1, characterised in that a dividing wall (26) is secured at the apex of the channel-like depression (25) and, with a hood (27) provided at the cover edge (22), forms a tunnel, that the tunnel (26, 27) is disposed in the part of the cover (20) which comprises the discharge lines (30, 40) and comprises a partition wall (28) for separating the coolant streams which can be associated with the discharge lines (30, 40).
3. Spray-cooled cover according to claim 1, characterised in that the square pipe (42) extends over a range of 30 to 40 degrees of the angle at the circumference of the cover (20) and at the edge of the tilting axis (II) is disposed at a distance (a) from the cover edge (22) which represents 1/3 of the diameter of the discharge line (40).
4. Spray-cooled cover according to claim 1, characterised in that the mouths of the discharge pipes (31, 41) are disposed at the same distance from the longitudinal axis (III) and from the bottom part (23) of the cover (20).
5. Spray-cooled cover according to claim 1, characterised in that connection hoses (33, 43) can be coupled to the coupling parts (61, 62) and, leading away at an angle "ε" of 10 degrees to the horizontal, can be coupled at the other end to pipe lengths which are disposed at the head end (81) of a swivel arm (83) of a swivel device (80).
6. Spray-cooled cover according to claim 5, characterised in that the swivel arm (83) comprises a swivel column (82) which is disposed outside of the furnace vessel (10) below the swivel plane of the cover (20) in the region of the tilting axis (II) and is disposed in space such that the cover (2), including the supply and discharge lines (30, 40, 50), can be swivelled without obstruction.
7. Spray-cooled cover according to claim 6, characterised in that the swivel column (82) is the rotary column (16) of the cover, at which column the swivel arm (83) has a radius (r) of 0.5 to 0.8 of the distance (R) from the rotary column (16) to the mouth of the discharge pipes (31, 41).
8. Spray-cooled cover according to claim 5, characterised in that connection hoses (35, 45) are provided which are secured at one end to the pipe lengths (34, 44) and at the other to swivel joints (36, 46).
9. Spray-cooled cover according to claim 8, characterised in that the swivel joints (36, 46) are disposed at the head end of discharge pipes (37, 47), which are connected at the foot end to the delivery station (70) for delivering the coolant to the plant network (79).
10. Spray-cooled cover according to one of the preceding claims, characterised in that a supply line (30) is provided for the coolant, which line is disposed coaxially with the discharge lines (30, 40), at least in the region of the connection hoses (35, 45).

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