JPS6126870Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a furnace wall repair lance that sprays a repair material such as refractory powder toward the inner surface of the furnace wall together with flame.

Generally, this type of lance is pipe-shaped, has a burner at its tip, and has passages for supplying powder, combustible fluid, and combustion-supporting gas to the burner, and passages for cooling water inside. However, in conventional products, there is a problem in that the combustible fluid and combustion-supporting gas in the passage are heated by the high temperature cooling water after the lance has been cooled, and as a result, the combustion state becomes unstable or incomplete.

In order to solve the above problems, the present invention provides a combustion-supporting gas pipe, a combustible fluid pipe, a powder pipe, a cooling water supply passage, and a cooling water discharge passage in the lance outer cylinder. , the peripheral wall of the discharge passage is formed by the outer cylinder, and a heat insulating layer is provided around the combustion-supporting gas pipe and the combustible fluid pipe to block heat of the cooling water in the discharge passage. It is said that

Next, embodiments will be described with reference to the drawings. In FIG. 1, which is a schematic partial longitudinal sectional view, a pipe-shaped lance 1 is equipped with a burner 2 at its tip. The burner 2 is provided with a plurality of powder spout ports 3 and a crater 4.
The powder ejected from the crater 4 is sprayed together with the flame ejected from the crater 4 toward the inner wall surface of the furnace (not shown). A powder pipe 5 for gas-transporting powder is connected to the inlet of the spout 3.
An outlet of a pipe 6 that supplies combustion-supporting gas (oxygen) is connected to the inlet of the crater 4, and an outlet of a pipe 7 that supplies flammable gas (for example, propane gas) is connected to the pipe 6 near the burner 2. Connected.

Figures 1 and 2 (schematic cross-sectional view of Figure 1)
As shown, the outer circumferences of the pipes 6 and 7 are surrounded by a large-diameter pipe 8 over substantially the entire length, and a cooling water supply passage 10 is formed between the pipes 6 and 8 and between the pipes 7 and 8. The above-mentioned pipes 5, 6, 7, and 8 are provided in the outer cylinder 11 of the lance 1, and the space in the outer cylinder 11 other than the installation space of the pipes 5, 6, 7, and 8 becomes a cooling water discharge passage 12. ing.
As shown in FIG. 1, the supply passage 10 is located near the burner 2.
It communicates with the discharge passage 12 at the passage 10.
After cooling the burner 2, the low-temperature cooling water supplied from the
2 and flows toward the rear end of the lance. Although not shown, the pipes 5 to 8 are connected to external powder, combustion supporting gas, etc. at the rear end of the lance 1.
The passage 12 is connected to a flammable gas supply line and a cooling water supply line, respectively, and the passage 12 is also connected to a cooling water discharge line.

According to the structure of the present invention explained above, the burner 2
While the powder is being thermally sprayed, the burner 2 and the outer cylinder 1 are cooled by the cooling water supplied from the passage 10 to the passage 12, and therefore the cooling water in the passage 12 becomes high temperature. However, there is a passage 1 around pipes 6 and 7.
Since a heat insulating layer is formed by the cooling water in the passage 12, the heat of the high temperature cooling water in the passage 12 is transferred to the pipes 6 and 7.
There are no (or very few) trowels passed down in Japan. Therefore, the combustion-supporting gas and combustible gas in the pipes 6 and 7 are kept at a low temperature, and flame in a desired and stable combustion state is ejected from the crater 4, making it possible to perform thermal spraying with high efficiency.

The present invention can also be embodied as shown in FIG. In the embodiment shown in FIG. 3, an inner cylinder 15 is provided within the outer cylinder 1, and a cooling water discharge passage 12 having an annular cross section is formed between the outer cylinder 1 and the inner cylinder 15. The inside of the inner cylinder 15 is hollow, and at a position away from the inner cylinder 15, a powder pipe 5, a combustion-supporting gas pipe 6, a combustible gas pipe 7, Cooling water supply pipes 8a are provided at intervals.

According to this structure, since the air in the space 16 acts as a heat insulating layer, the heat of the high-temperature cooling water in the passage 12 is largely prevented from being transmitted to the pipes 6 and 7. effect can be obtained.

It is also possible to eliminate the cooling water supply pipe 8a in FIG. 3 and use the space 16 as a cooling water supply passage.

The present invention can also be applied to devices that use flammable liquid (oil) instead of flammable gas.

[Brief explanation of the drawing]

Fig. 1 is a schematic vertical cross-sectional view of an embodiment of the present invention;
The figure is a schematic cross-sectional view of FIG. 1, and FIG. 3 is a schematic cross-sectional view of another embodiment. 1... Lance, 5... Powder pipe, 6... Combustion-supporting gas pipe, 7...
Flammable gas pipe, 10...cooling water supply passage,
12...Cooling water discharge passage. 〓〓〓〓〓

Claims (1)

[Scope of utility model registration request] A combustion-supporting gas pipe, a combustible fluid pipe, a powder pipe, a cooling water supply passage, and a cooling water discharge passage are provided in the lance outer cylinder, and the peripheral wall of the discharge passage is covered with the outer cylinder. A lance for repairing a furnace wall, characterized in that a heat insulating layer is provided around the combustion-supporting gas pipe and the combustible fluid pipe to block heat of the cooling water in the discharge passage.