JP3164408B2 - Oxy-gas fuel burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxygen-gas fuel burner suitable for preheating a degassing tank of a vacuum degassing apparatus used in an ironworks or preheating a ladle tundish or the like.

[0002]

2. Description of the Related Art Since a conventional oxy-gas fuel burner simply burns gaseous fuel with oxygen, the amount of combustion gas is small and the flame is high in temperature. Therefore, for example, when used directly for drying, preheating, etc. of refractory material in a degassing tank of a molten steel pot or a vacuum degassing apparatus, the amount of combustion gas is small as described above,
Local heating with a high-temperature flame results in melting of the refractory material. Even when used for melting metal, there is a tendency for local heating, and furthermore, it is not suitable for hot cleaning performed by uniformly raising the temperature in the entire tank. When preheating a vertically long refractory tank such as a vacuum degassing tank in a closed state, preheat at a low temperature (150 ° C to 200 ° C) for a long time to evaporate water and then heat at a high temperature (1450 ° C). To do so, two types of burners, a high temperature flame and a low temperature flame, were required.

[0003] Therefore, conventionally, several types of burners suitable for each application have to be prepared, and a pot or the like must be moved to an optimum burner position, so that equipment costs are high, and
The operation was complicated and inefficient. Thus, the present invention provides an oxy-gas fuel burner that can be used in a variety of applications where high and low temperature flames can be obtained with the same burner and require both low and high temperature heating. The purpose is to:

[0004]

According to the present invention, in order to achieve the above object, a dilution air passage provided with a pilot burner is provided at a central portion of a burner main body, and a cooling water passage is provided at an outer peripheral portion of a leading end of the dilution air passage. And a plurality of combustion nozzles including a gas fuel passage in a central portion and an oxygen passage on the outer periphery thereof are disposed inside the cooling water passage. And large and small combustion nozzles.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a burner main body. A dilution air supply pipe 2 is provided at a central portion of the burner main body 1, and diluted air is blown out from a distal end of the burner main body 1 from a dilution air chamber 4 described below provided in the burner main body 1. It has become. Further, the air passage P ₁ of the dilution air supply pipe 2 nozzle 6 is provided, the pilot air supply port 7 and pilot gas inlet 8 is provided at a portion that protrudes from the rear end wall of the burner body 1, The pilot burner 5 is configured together with the nozzle 6.

Further, partition plates 9 to 13 are provided between the dilution air supply pipe 2 and the outer cylinder 3 of the burner main body 1, and the air is provided between the partition plate 9 and the rear end wall of the burner main body 1. Passage P ₁
The dilution air chamber 4 communicating with the partition plates 9 and 1 is formed.
The second gas fuel chamber 14, which will be described below with reference to FIG.
1, the second oxygen chamber 15, the partition plates 11 and 12, the first gas fuel chamber 16, and the partition plates 12 and 13, the first oxygen chamber 17.
However, a water cooling chamber 18 is formed by the partition plate 13 and a nozzle head 19 provided at the tip of the burner main body 1.

The water cooling chamber 18 has a partition pipe 20 therein.
The cooling water flows through the cooling water passage 21 to cool the tip of the burner main body 1.

A plurality of independent first and second combustion nozzles 22A and 22B having different large and small capacities are formed through the cooling water passage 21.

The first combustion nozzle 22A penetrates through the partition plate 13 and communicates with the first oxygen chamber 17, and has an oxygen passage P formed by an oxygen pipe 23a whose tip is connected to the opening 19a of the nozzle head 19. ₂ and the inside of the oxygen pipe 23a, penetrate the partition plate 12 and communicate with the first gas fuel chamber 16, the tip is connected to the stabilizer 31, and the gas fuel passage P
₃ and a gas fuel pipe 25a. The Sutapiraiza 31, as shown in FIG. 3, the tip portion is located inward slightly from the nozzle head 19, the tip periphery spreads in a trumpet shape so as squeezing the oxygen passage P _2.

[0010] With this configuration, as shown in FIG. 3, the oxygen from the oxygen passageway P ₂ is, when the gas fuel injected from the fuel gas passage P _3, negative pressure is formed in front of Sutapiraiza 31, hot gas Circulates, the gas fuel and oxygen are sufficiently mixed, and stable combustion is continued. As shown in FIG. 4, the first combustion nozzles 22A are arranged in large numbers (ten in the figure) on the same circumference.

On the other hand, in the second combustion nozzle 22B, the oxygen pipe 23b communicates with the second oxygen chamber 15 and the gas fuel pipe 25
b differs only in that it communicates with the second gas fuel chamber 14, and the other parts have substantially the same configuration. In the embodiment, two second combustion nozzles 22B are provided. In addition, 3
2 is a flame detector of the main burner, and 33 is a sight hole.

Next, a method of operating the oxygen-gas fuel burner having the above-described configuration will be described in detail. First, the dilution air is supplied from the dilution air chamber 4 at 10% of the maximum flow rate, and the pilot burner 5 is ignited. The ignition is confirmed by the flame detector 26 behind the burner main body 1. In order to uniformly heat the refractory material without local heating, such as drying of the refractory material in a molten steel pot, a large amount of combustion gas is apparently required. Therefore, the dilution air flows at the maximum capacity, for example, 1500 m ³ / h. .

On the other hand, in the early stage of drying, a low temperature (120
In order to heat the refractory material at a temperature of 200 ° C. to 200 ° C., the second combustion burner 22B is set to a minimum combustion amount (for example, 13.3 × 10 ⁴ k).
cal / h). Thereafter, the combustion capacity is gradually increased, and when the second combustion burner 22B becomes equal to or larger than the maximum combustion amount (for example, 80 × 10 ⁴ kcal / h), the first combustion burner 22A is set to the minimum combustion amount (for example, 80 × 10 ⁴ kcal / h). ^Four
kcal / h), and ignites to sequentially increase the combustion amount.

When preheating the refractory material of the molten steel pot, the refractory material of about 800 ° C. is reduced to 1200 ° C. in about two to three hours.
It is necessary to raise the temperature to the order. Therefore, after the pilot burner 5 is ignited, the first combustion burner 22A is ignited to preheat at a required combustion amount. In this case, it is preferable to appropriately supply dilution air to prevent local heating and thermal shock to the refractory material.

Further, when the metal is melted, a high temperature (1450 ° C. or higher) higher than the preheating temperature is required.
Heat with A only. Also in this case, some dilution air may be supplied.

In the above embodiment, the case where two types of combustion nozzles 22A and 22B having different combustion capacities are provided is shown.
The type is not limited to two types but may be one type. However, if a plurality of types of combustion nozzles are used, the combustion range can be widened and various types of heating can be dealt with.

In FIGS. 1 and 2, the gas fuel pipe 25a
(25b) and the insulating tube 2 between the oxygen tube 23a (23b).
9 through the gas fuel pipe 25a (25b).
In the event that there is a leak, it serves as a safety room. In addition, the inspection air is supplied to a passage 30 (the tip is closed by the throttle member 24) formed between the gas fuel pipe 25a (25b) and the insulating pipe 29, and the leak in the passage 30 can be detected. ing.

[0018]

As is apparent from the above description, the oxy-gas fuel burner of the present invention has a diluted air passage in the center,
By controlling the dilution air amount, the apparent combustion gas amount can be adjusted.

[0019] Therefore, since a low-temperature uniform heating to a high-temperature local heating can be performed by the combustion amount of each combustion nozzle and the dilution air amount, drying of the refractory material (120 ° C.
(200 ° C.), preheating of the refractory material (800 ° C. to 1200 ° C.) and melting of the metal (1450 ° C. or more).

Further, if the combustion nozzles are several types of nozzles having different combustion amounts, the combustion range can be further increased.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an oxy-gas fuel burner of the present invention.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is an enlarged cross-sectional view of the nozzle head unit of FIG.

FIG. 4 is a front view of FIG. 1;

FIG. 5 is a rear view of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Burner main body, 2 ... Dilution air supply pipe, 4 ... Dilution air chamber, 5 ... Pilot burner, 9-13 ... Partition plate, 14 ...
Second gas fuel chamber, 15: second oxygen chamber, 16: first gas fuel chamber, 17: first oxygen chamber, 19: water cooling chamber, 19: nozzle head, 21: cooling water passage, 22A: first combustion nozzle ,
22B: second combustion nozzle, 23a, 23b: oxygen pipe, 2
5a, 25b: gas fuel pipe, P ₁ ... dilution air passage, P ₂ ...
Oxygen passage, P ₃ ... gas fuel passage.

Continuing on the front page (72) Inventor Katsuhiro Noguchi 1-chome, Kawasaki-dori, Mizushima, Kurashiki-shi, Okayama Prefecture Inside the Mizushima Works, Kawasaki Steel (72) Inventor Masahiro Yoshida 1-chome, Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama Mizushima, Ltd. Inside steelworks (56) References JP-A-4-268106 (JP, A) JP-A-62-116816 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23D 14/22 F23D 14/32 F23D 14/78 F23C 11/00 310

Claims (2)

(57) [Claims] A dilution air passage provided with a pilot burner is provided at a central portion of a burner main body, a cooling water passage is formed at an outer peripheral portion of a distal end of the dilution air passage, and a gas fuel passage at a central portion is provided inside the cooling water passage. An oxygen-gas fuel burner, comprising: a plurality of combustion nozzles comprising: a plurality of combustion nozzles; 2. An oxygen-gas fuel burner according to claim 1, wherein the plurality of combustion nozzles are large and small combustion nozzles having different combustion capacities.