JPS5949515B2 - Refining vessel wall repair lance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lance for repairing the walls of refining vessels, and in particular, the lance is used to repair the walls of vessels such as converters by spraying molten or semi-molten refractories. This is a proposal for a lance that is also suitable for cleaning the bottom of the hearth.

Conventionally, when repairing walls of high-temperature refractories such as steelmaking furnaces and ladles,
A frame gunning device as shown in FIG. 1 has been proposed.

In this device, one end of a lance 2 is rotatably supported on a traveling truck 1, 3 is a pivot pin, 4 is a cylinder, and 5 is a heat shield plate. A nozzle 6 is fixed to the tip of the lance. For example, when repairing the side wall of the converter 7, the tip of the lance 2 is attached to the cart 1 as shown in the figure.
is inserted into the furnace, and a combustion supporting gas such as 01 is injected together with the spray repair material (refractory material + fine powder of C) from the nozzle 6, and the refractory material is melted by combustion due to contact between the two. This is now being sprayed to repair furnace walls.
However, in the case of conventional lances, there is a
It has a structure in which two nozzles are fixed, and it can only be repaired within a narrow area at the tip of the lance, facing the nozzle jet, which has the disadvantage that it takes a long time to repair the high-temperature refractory wall. The object of the present invention is to overcome the drawbacks of the conventional lances for repairing the walls of refining vessels as described above, and to propose a new lance structure that functions advantageously in cleaning the bottom of the vessel.

The lance structure of the present invention will be described in detail below based on the description of the drawings showing preferred embodiments. The lance 2 is composed of concentric quadruple pipes, and the center flow path 8 is filled with sprayed repair material (Mg
The annular flow path 9 surrounding the center flow path 8 is filled with oxygen gas (O2
:50% or more), and two outer annular channels 10 and 1 surrounding the annular channel 9 and communicating with each other.
1 has a structure that allows the cooling water to flow both ways.

Of course, oxygen gas may be allowed to flow through the central channel 8 and the spray repair material may flow from the annular channel 9. The lance 2 described above has the central flow path 8 and the annular flow path 9 extending from the middle of the flow path.
Attach a plurality of nozzles 6-1 that communicate with each other. This nozzle 6 has a concentric double pipe structure consisting of an inner nozzle pipe 6a forming a flow path communicating with the central flow path 8 and an outer nozzle pipe 6b forming a flow path communicating with the annular flow path 9. be. This nozzle 6 is fixed so as to protrude in the radial direction with respect to the lance tube axis e, even though it is branched from the middle of the flow path of the lance 2. W! , In the example shown in Fig. 2, an inclined shape is shown in consideration of the flow resistance due to the powder flowing in the center channel 8, but a non-slanted one shown in Fig. 3, which protrudes in the radial direction, may also be used. good. The arrangement of the nozzle 6 on the lance 2 is such that one nozzle 6 is provided protrudingly in the circumferential direction of the lance 2, and one nozzle 6 is disposed protrudingly in the circumferential direction of the lance 2. As shown in Figure M3, multiple pieces are provided protrudingly.

In a preferred embodiment, a plurality of the nozzles 6 arranged in the circumferential direction are arranged in a row along the generatrix direction of the lance at each position. This arrangement of the nozzles 6 is convenient for repairing a wide area at once, and if some of the nozzles 6 are plugged, it can also be used for spot repairs. In the above-mentioned lance 2, with the intention of improving the life of the furnace wall, as seen in converters, slag is left in the furnace and dolomite is added to increase the bulkiness of the slag and prevent it from forming on the furnace wall. A method of forming a slag coating to protect the furnace bottom 7a is used.
A furnace bottom cleaning structure is provided to eliminate the problem of deposits 12 being deposited on the furnace and increasing to the bottom and reducing the internal volume of the furnace.

That is, this purpose is achieved by providing a cleaning opening 13 communicating with the oxygen gas flow channel 9 on the axial surface of the tip of the lance 2. An example of a lance structure used for cleaning the bottom of the hearth will be explained in FIGS. 5 and 6.

Each figure of WJ5 and 6 is applied to the lance of the second illustrated example. FIG. 5 shows an example in which a plug is screwed into the inner peripheral surface of the cleaning opening 13 at the tip of the lance 2, and a blind plug 14 is screwed into the cleaning opening 13 to close it. In this case, normal furnace wall repair is performed. On the other hand, when dissolving deposits 12 on the furnace bottom 7a, remove the blind plug 14 and clean the cavity with a protective sleeve 16 screwed in to protect the threaded part 15, as shown in FIG. It is assumed that the opening 13a.

The case shown in FIG. 4 is similarly closed with a blind plug (not shown), and can be opened by removing the blind plug during cleaning.

Note that if the cleaning openings 13, 13a are formed as described above, when the lance 2 is inserted into the converter 7 as shown in FIG.
Because it faces the furnace, a part of the introduced oxygen comes into contact with the hot furnace bottom deposits, burns them, and melts them, so that the desired cleaning can be achieved.

In addition, when using the center flow path as the oxygen flow path other than the illustrated example, the cleaning opening 13 is opened at a position corresponding to the center flow path. Since the lance of the present invention is constructed as described above, it is possible to repair a wide area of the furnace wall at once, and when the furnace wall is repaired, the bottom of the furnace can also be cleaned at the same time. It is extremely effective in practical use for temporary repairs.

[Brief explanation of the drawing]

Figure 1 of the drawings is a route map of a conventional frame gunning device, Figures W and 2 are route diagrams showing one embodiment of the lance O of the present invention, and Figure 3 is a route map showing another embodiment of the present invention. Figure 4 is the third
Figure 5 is a sectional view of the lance tip with the cleaning opening at the lance tip closed using a plug, and Figure 6 is a sectional view of the lance used to dissolve deposits on the bottom of the furnace. FIG. 3 is an analytical view when the tip is in an open state. 1...Dolly, 2...Lance, 3...Pin, 4...
・Cylinder, 5... Heat shield, 6... Nozzle, 7...
・Converter, 7*-... Hearth bottom, 8... Center channel, 9...
Annular flow path, 10, 11... Outer annular flow path, 12... Furnace bottom deposit, 13.-Cleaning opening, e... Tube axis.

Claims (1)

[Claims] 1 In a lance used for repairing a high-temperature refractory wall of a refining vessel with concentric multiple pipes consisting of a flow path for sprayed repair material and a flow path for oxygen flow, the inner nozzle pipe communicates with the center flow path of the multiple pipes and the outer nozzle pipe communicates with the center flow path of the multiple pipes. Concentric double pipe nozzles, each of which has a nozzle pipe communicating with a multi-pipe annular flow path, are arranged radially with respect to the pipe axis in such a manner that one or more concentric double pipe nozzles are lined up in the circumferential direction in the generatrix direction, and the axial surface of the tip of the lance. A lance for repairing a wall of a refining vessel, characterized in that a cleaning opening communicating with the passage for flowing oxygen gas is provided in the lance.