JPS6035032Y2 - Auxiliary combustion device for electric furnace - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an auxiliary combustion device for an electric furnace.

Recently, in electric furnaces, oxygen, heavy oil, etc. are directly combusted in the furnace during the melting period to promote melting in order to improve productivity by shortening the melting period and reduce power consumption. An auxiliary combustion device is installed to

As shown in FIG. 1, this type of conventional auxiliary combustion apparatus has been of a movable type in which a side burner C is removably inserted into a burner insertion hole formed in a furnace wall a.

That is, if the furnace wall is fixed, the tip of the burner will become clogged and the fireproof structure will become complicated.

Therefore, the conventional type requires a burner stand d for pulling the burner C out of the furnace when it is not in use, and requires a larger furnace installation space than necessary.

Furthermore, there were many cases where limit switches, motors, chains, etc. for mobile types were burnt out due to splash slag, flames, etc. and became unusable, making burner maintenance a problem.

Furthermore, since the burner body C was water-cooled, water leakage accidents occurred during operation of the electric furnace, which was extremely dangerous.

In addition, there was more outside air intrusion than through the burner insertion holes in the furnace wall, and heat loss was high.

Furthermore, because burner C takes up a lot of space, there is only one burner for each cold spot, so there are problems such as a limited melting range.

Therefore, the present invention was devised in view of the above-mentioned problems, and it eliminates water leakage accidents from the burner, is miniaturized, greatly simplifies the installation method and operation method, and is maintenance-free. To provide an auxiliary combustion device for an electric furnace that allows installation of a plurality of burners, widens the angle of the ejected flame, doubles the melting effect, and saves energy by preventing outside air from entering through the furnace wall.

Therefore, the feature is that in an auxiliary combustion device in which a side burner is installed on the wall of an electric furnace, the burner body coated with a graphite-based refractory is inserted into the insertion hole provided in the water cooling jacket of the furnace wall. The burner body consists of a concentric quadruple tube, and a center hole formed by the quadruple tube and three annular holes concentric with the center hole are provided with atomized air, oil, purge air, and oxygen ejection holes. There is a certain point.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIGS. 2 and 3, 1 is a furnace shell of a three-phase arc furnace, and the furnace wall 1 consists of a furnace wall 4 consisting of refractory bricks 2 and a water-cooling jacket or box 3, and an iron wall covering the furnace wall 4. Consists of skin 5 grade.

Three electrodes 6 hang down from the furnace wall at the center of the furnace.

7 is a tapping port, and 8 is a slag tapping port.

9 indicates a slug line.

A burner insertion hole 10 is provided in the water cooling jacket 3 that constitutes the furnace wall 4.

In some cases, two holes 10 are provided in parallel to one water cooling jacket 3, or one hole is provided in each of two water cooling jackets next to each other, and the holes are oriented toward the cold zone on the slag line 9 of the reactor core. There is.

A water cooling jacket 3 having such an insertion hole 10 is provided at each cold spot position.

A jet burner 11 is inserted and fixed into each insertion hole 10 of the water cooling jacket 3, respectively.

The outer periphery of the main body 12 of the jet burner 11 is covered with a graphite refractory 13, and the outer periphery of the refractory 13 is connected to the insertion hole 10.
It is tightly fitted and fixed to the inner surface to seal the insertion hole 10.

Furthermore, the burner 11 has a bracket 1 fixed to the steel shell 5.
4 with bolts 15.

Details of the jet burner 11 are shown in FIG.

The burner 11 consists of a burner main body 12 and a body 16, and the side of the body 16 is provided with an oxygen supply port 17, an oil or gas supply port 18, and a purge air supply port 19. A burner body attachment hole 20 passes through it.

The burner main body 12 consists of four-layered cylinders, each of which has a diameter of 21°, 22.
23 and 24 are concentrically screwed into the mounting hole 20.

The cylindrical body 21 at the center is screwed into the rear end of the attachment hole 20, and atomized air 25 is supplied from the rear end of the cylindrical body 21.

The next cylindrical body 22 into which the central cylindrical body 21 is fitted has a mounting hole 20.
The cylindrical body 22 and the oil supply port 18 are screwed into the middle part.
are in communication.

The tip of the central cylindrical body 21 is located in the middle of the second cylindrical body 22, and serves to atomize the oil supplied into the second cylindrical body 22.

The third cylindrical body 23 from the center is screwed onto a boss portion 26 provided in the middle of the mounting hole 20, and the interior of the cylindrical body 23 and the purge air supply port 19 communicate with each other.

The tip of this third cylindrical body 23 is connected to the central cylindrical body 21.
It is located at approximately the same position as the tip of.

The outermost cylindrical body 24 is screwed onto the front end of the attachment hole 20, and the cylindrical body 24 and the oxygen supply port 17 communicate with each other.

The tip of this outer cylinder 24 projects more forward than the tip of the second cylinder 22.

The outer peripheral surface of this outer cylinder 24 is specially coated.

Therefore, it can be inserted into and removed from the graphite refractory 13 covering the outer circumference of the outer cylinder 24 without being stuck.

According to the above-mentioned embodiment of the present invention, (1) Since the jet burner 11 is fixed to the furnace wall 4, there is no need to take it in and take it out as in the conventional case, and the operation is simple.

■Since the burner 11 is not water-cooled, there is no need to worry about water leakage and it is safe.

Since the burner body 12 is covered with a graphite-based refractory 13, there is no slag or splash attached to the tip of the burner 11, and the burner 11 can be kept fixed at all times.

■Since the burner insertion hole 10 is sealed by the burner 11, there is no air entering from the hole 10, which saves energy.
Moreover, there is no need to clean the burner hole as in the conventional method.

■Since it is a fixed type, it does not require a burner stand and can be easily installed anywhere around the furnace.

■Burner 11 can be easily attached and detached from outside the furnace.
There is no need to stop electric furnace operation when replacing.

- Since the burner 11 is of a dual type, the combustion range is expanded and the melting time is shortened.

■Since no moving device is required to move the burner body in and out of the furnace, equipment costs are reduced.

(2) Since only one of the double burners 11 can be used by operating the valve, it is possible to reduce the amount of oxygen used as required.

Note that the present invention is not limited to the above embodiments,
The burner may be in series.

According to the present invention, the burner is miniaturized without water leakage accidents, the installation method and operation method are greatly simplified, and there is no driving device, making it easier to clean slag, metal, etc. attached to the inner surface of the burner tile than conventional burner tiles. There is no need to remove it, so it is maintenance-free, and the burner operation rate is 100%, making it possible to install multiple burners, expanding the angle of the ejected flame, doubling the melting effect, and preventing air from entering from outside through the furnace wall, which saves energy. This will bring about great effects in practical use, such as the ability to improve the

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional example, FIG. 2 is a plan sectional view showing an embodiment of the present invention, FIG. 3 is a sectional view of a main part, and FIG. 4 is a sectional view of a burner. 3... Water cooling jacket, 4... Furnace wall, 10... Insertion port, 11... Burner, 12... Burner body, 13 ...Refractories.

Claims (1)

[Scope of utility model registration request] In an auxiliary combustion device in which a side burner is provided on the wall of an electric furnace, a burner body coated with a graphite-based refractory is inserted and fixed into an insertion hole provided in a water cooling jacket of the furnace wall, and the burner body is concentrically Consisting of 4-layer cylinders, the 4
An auxiliary combustion device for an electric furnace, characterized in that a center hole formed by a heavy cylinder and three annular holes concentric with the center hole are injection holes for atomizing air, oil, purge air, and oxygen.