Metallurgical apparatus – Process – Tuyere operation
Patent
1999-08-09
2000-12-05
Kastler, Scott
Metallurgical apparatus
Process
Tuyere operation
266225, C21B 716
Patent
active
061562610
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to consumable lances for the top-blowing of gas and/or carbon particles, and more particularly to a method and device for positioning the mouth of a consumable lance.
2. Description of the Related Art
EP 0,723,129 A2 has disclosed an arc furnace in which both fixed and adjustable lances are guided through the furnace vessel wall. These lances enable a very wide variety of media to be introduced onto or into the molten material. This document makes no further mention of a manipulator which enables the adjustable lance to be moved into a waiting position and into an operating position.
DE 40 34 809 has disclosed a device for the manipulation of the lances for blowing in oxygen and/or carbon, in particular in front of an arc furnace. This device has a tower with bearing arm and components with which the differently designed lances, including the feed hoses, can be moved.
A drawback is that such a manipulator requires a furnace platform with a relatively high freedom of movement. An expensive and technically complex handling implement is required in order to position the lance tip. To reach a defined position, a large number of movements of the manipulator are required, including a change in the location of the implement itself.
Lances of predeterminable length are replaced by new lances after they have burnt down beyond a permissable length.
SUMMARY OF THE INVENTION
The invention is based on the object of providing a method and a device for positioning the mouth of a consumable lance, in which the above-mentioned drawbacks are avoided and in which it is possible, with simple means and a minimum of material, to position the lance tip as desired while using particularly little space on the furnace platform.
According to the invention, the lance is guided essentially tangentially to the furnace vessel, in a plane above the liquid level. A relatively small opening, in particular a slot-like opening which is directed vertically, is provided in the furnace vessel for the lance. Outside the furnace vessel, in the vicinity of the furnace aperture, the lance is bent such that its front area projects through the furnace wall into the furnace interior.
The mouth of the lance can be positioned in a wide area in the furnace interior simply by acting on the axis of rotation of the straight part of the pipe, which is situated essentially outside the furnace, and by effecting the change in bending radius and the rate at which the lance is pushed in.
Depending on the lance burn-off, it is possible to arrange a new lance section between the hose and remaining lance in good time during breaks in production. The result is a quasi-endless lance, in which each of the individual lance parts is fully consumed.
Advantageously, a force which effects elastic bending may be applied to the lance in the bending area. If the bending force is reduced in a controlled manner, the mouth of the lance moves elastically into the desired position.
If necessary, this force can also be applied at such a level that plastic deformation of the pipe end piece is effected in order to achieve a predeterminable radius.
The individual pipe sections are joined together essentially by connecting sleeves or by direct welding. Advantageously, this weld point is protected by a monitoring system and by reducing the bending force to a predetermined permissible level.
The bending device essentially comprises three rolls which are provided opposite one another on both sides of the lance. In addition, further guide and/or drive rolls are provided in particular in the straight part of the lance.
To bend the lance in the area in front of the furnace-wall opening, at least one of the rolls is displaceable, specifically the last and/or the penultimate roll, as seen in the lance feed direction. The use of a hydraulic piston-cylinder unit represents an advantageous configuration of the displacement unit. The use of non-flammable liquids makes it possible to arrange such a simple component parti
REFERENCES:
patent: 4653730 (1987-03-01), Wunsche et al.
patent: 4729548 (1988-03-01), Sullins
Kastler Scott
Mannesmann AG
LandOfFree
Method and device for positioning the mouth of a consumable lanc does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and device for positioning the mouth of a consumable lanc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for positioning the mouth of a consumable lanc will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-958610