JPS58120077A - Flame spraying nozzle for flame gunning device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal spray lance nozzle for a flame gunning device.

Conventionally, when repairing refractory walls such as steelmaking furnaces and composting pots, the first
A seven-frame gunning device as shown in the figure has been proposed. In this device, one end of a lanceco is rotatably supported on a traveling trolley, and 3 is a pivot bottle and Hirohiro cylinder, and j is a heat shield plate. A nozzle 6 is fixed to the tip of the lance. For example, when repairing the entire side wall of the converter 7, the tip of the lance t1 is fixed as shown in the figure.
The cart is moved and inserted into the furnace, and the repair material (fine powder of 10 G of refractory material) is injected together with a combustion supporting gas such as 02 from the nozzle 6, and the refractory material is destroyed by combustion due to contact between the two. The furnace walls are repaired by melting and spraying.

However, such conventional nozzles are fixed to a lance and have a structure that cannot be replaced.

Moreover, such conventional lance nozzles generally have a complicated structure and are used under harsh conditions, making them susceptible to damage and requiring frequent replacement if the nozzle becomes clogged9. It is. However, in the past, the lance λ had to be replaced because it was a fixed type and could not be replaced9, resulting in high costs. In particular, when spraying a mixture of refractory powder and C powder among nozzles, the inner nozzle tube that flows the repair material is subject to severe wear and tear, and the disadvantage is that the entire lance must be replaced, depending on the lifespan of the inner nozzle tube. It was observed.

This invention was proposed with the aim of overcoming the drawbacks of the conventional lance nozzle as described above.
The structure is such that only the inner nozzle tube, which wears quickly, can be attached and detached. The details of its configuration will be explained below.

In the 27-nozzle nozzle of the present invention, the spraying is performed using a concentric multi-pipe lance consisting of a central flow path for material flow and an annular flow path for combustion-supporting gas flow, with the inner nozzle pipe communicating with the center flow path and the outer nozzle The feature is that the tip nozzle of the concentric double tube, which communicates with the annular flow path, is removably screwed onto a boss fixed to the inner nozzle tube and lance inner tube. Figure W, 2 is a drawing showing a preferred embodiment thereof.

The lanceco is a concentric joint pipe, and the center flow path is located between the pipes, and the spraying of a mixture of refractory powder such as 0 and powdered solid carbon (coke powder as a preferred example) causes the repair material to flow, and Combustion-supporting gas such as oxygen expansion and air is made to flow through the annular passage formed between Ja and the lance outer tube 2b. A double pipe with a water-cooled jacket structure is provided on the outside of the lance outer pipe b.

The inner nozzle pipe 6a is located in the center flow path t of the lanceco, and the outer nozzle igb is located in the annular flow path, respectively, and the lance λ
It is installed so that it communicates in the direction of the tip. In particular, the inner nozzle pipe 6a is removably attached by screwing the inner circumferential surface of the lance inner pipe 25L to a threaded boss 10, so that it can be replaced in case of wear.

Furthermore, the nozzle having such a structure can also be applied to a nozzle 6' provided in the radial direction of the lance other than the tip nozzle. Furthermore, as shown in Figure 3, when the tip nozzle is not in use, a blind plug//\r is screwed onto the refractory/2.
t- administer. Note that the i-plug l/ may be provided with a seal packing/3 or may be provided with a spacer.

As explained above, according to the present invention, only the inner nozzle pipe, which wears quickly, is made removable, so the spraying accuracy is high and it is effective in reliably forming the desired repair wall. This has excellent practical effects, such as being able to provide an inexpensive lance nozzle with a long life.

[Brief explanation of drawings]

The first figure in the drawings is an explanatory diagram of the frame gunning device, and the second figure is an explanatory diagram of the frame gunning device.
The figure is a sectional view of the lance nozzle of the embodiment, and FIG. 3 is a drawing showing the state in which the tip nozzle is blinded. l...Dolly, λ...Lance, 2a...Lance inner tube, 2b...Lance outer tube, 3...Bin, Hiro...
Cylinder, j... Heat shield, 6.6'... Nozzle, 6
a...Inner nozzle pipe, 6b...Outer nozzle pipe, 7...
Converter, ♂...center passage of lance, ri...annular passage of lance, IQ...boss, //...blind plug, /J-
- Refractory, /3... Seal packing, A... Combustion supporting gas, M... Repair material.

Claims (1)

[Claims] 1. Spraying is performed using a concentric multi-pipe lance consisting of a central flow path for repair material flow and an annular flow path for combustion-supporting gas flow, with an inner nozzle pipe communicating with the center flow path and an outer nozzle pipe communicating with the annular flow path. A thermal spraying lance nozzle for a 7-ram gunning device, characterized in that the tip nozzle of a concentric double tube communicates with the inner nozzle tube; the inner nozzle tube is removably screwed into a boss fixed to the lance inner tube .