JP2001065824A - Burner for ignition furnace of sintering machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling efficiency of an ignition furnace burner, prevent deformation of the burner, obtain a stable flame and improve stability and yield of operation by disposing a water cooled jacket in contact with an iron shell of a mixing portion. SOLUTION: Fuel gas and combustion air supplied from a fuel gas header 6 and a combustion air header 5, respectively, are directed to a mixing portion through a fuel gas channel 14 and a combustion air channel 15 so as to be mixed in the mixing portion 7. The mixing portion 7 is exposed to high temperature resulting from the combustion of the mixed gas, and therefore a box type water cooled jacket 10 is disposed, in order to prevent deformation, along the entire length in the horizontal direction of the ignition furnace so as to be in contact with an iron shell 16 of the mixing portion 7. Cooling water 17 in the water cooled jacket 10 is forcibly circulated by means of a pump or the like. As a result, the iron surface 16 of the mixing portion 7 is cooled being in contact with the cooled water 17 in the water cooled jacket 10, and further, cooling efficiency is improved by the circulation of the cooling water 17 and deformation by heat can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a burner for an ignition furnace of a sintering machine.

[0002]

2. Description of the Related Art Generally, in a sintering machine, as shown in FIG.
Is formed, and the raw material layer 3 is ignited using the burner 4 arranged in the ignition furnace 2. Then, the raw material layer 3 is the pallet truck 1
Sintered while moving. Since the raw material layer 3 has a wide width at right angles to the moving direction (that is, the width direction of the raw material layer 3),
A slit burner having a rectangular opening in the width direction of the raw material layer 3 and a plurality of cylindrical burners are arranged on the ceiling of the ignition furnace 2. As shown in the example of FIG. 4, these burners mix a fuel gas and combustion air in a mixing section 7 provided in the burner 4, burn the mixed gas, and generate a flame of the mixing section 7. Injection is made to the raw material layer 3 from a nozzle 9 provided at the lower end.

[0003] The steel shell of the mixing section 7 is heated by receiving the heat of combustion of the mixed gas and heat radiation from inside the ignition furnace, and its durability is impaired. Therefore, various cooling techniques have been proposed to protect the mixing section 7. Japanese Patent Publication No. Sho 62-48129 discloses a burner in which the mixing section is protected by a refractory and further cooled by providing a water-cooled or air-cooled pipe. In Japanese Utility Model Laid-Open No. 5-42997, a cooling pipe for cooling a refractory forming a nozzle of a burner with a fluid (that is, water or air) is provided, and a metal pipe for supporting the refractory is provided on the cooling pipe. There is disclosed a burner in which an anchor is disposed.

However, since the temperature of the flame is as high as 1300 ° C., the conventional burner is not sufficiently cooled, and the thermal deformation of the steel occurs within a service period of about two years, making it difficult to form a stable flame. . Metal anchors use materials with high high-temperature strength (for example, JIS 310S), but the high-temperature corrosion makes it impossible for the anchors to support the weight of the refractory, and the refractory falls off in about 6 months of use. Problems.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to improve the durability by improving the cooling efficiency of a steel shell in a mixing section for mixing fuel gas and combustion air. An object of the present invention is to provide a furnace burner.

[0006]

SUMMARY OF THE INVENTION The present invention has a fuel gas flow path and a combustion air flow path, and uses the fuel gas flow from the fuel gas flow path and the combustion air flow from the combustion air flow path. In a sintering machine ignition furnace burner having a mixing section for mixing and burning and having a nozzle for injecting a flame by combustion at a lower end of the mixing section, a sintering machine in which a water-cooled jacket in contact with a steel shell of the mixing section is provided. It is a burner for an ignition furnace.

In the above invention, it is desirable that the cooling pipe through which the cooling water or the cooling air flows is buried in the refractory forming the nozzle of the burner, and the cooling pipe is provided with an anchor for supporting the refractory. .

[0008]

FIG. 1 is a sectional view showing an example in which a slit nozzle having a rectangular opening in the width direction of a raw material layer is used as a burner for an ignition furnace of the present invention. Fuel gas and combustion air supplied from the fuel gas header 6 and the combustion air header 5 are introduced into the mixing section 7 through the fuel gas flow path 14 and the combustion air flow path 15, respectively.
Mixed in. A nozzle 9 having a rectangular cross section is provided at the lower end of the mixing section 7 over the entire length of the raw material layer in the width direction.
A flame due to the combustion of the mixed gas is injected from the nozzle 9 to the raw material layer.

The mixing section 7 is exposed to a high temperature due to the combustion of the mixed gas.
16 need to be cooled. Therefore, a box-shaped water-cooled jacket 10 is disposed so as to be in contact with the steel shell 16 of the mixing section 7 over the entire length in the width direction of the ignition furnace. Cooling water in the water cooling jacket 10
17 forcibly circulates using a pump or the like. as a result,
The steel shell 16 of the mixing section 7 is cooled while being in contact with the cooling water 17 in the water cooling jacket 10, and the circulation of the cooling water 17 improves the cooling efficiency and prevents deformation due to heat.

An anchor 11 is embedded in the refractory 8 forming the nozzle 9 to support the refractory 8, and the anchor 11 may be cooled by a water cooling jacket 10. Since the cooling effect of the anchor 11 is improved, high-temperature corrosion of the anchor 11 can be prevented, and the refractory 8 can be prevented from falling off. As shown in FIG. 2, a cooling pipe 12 is embedded in the refractory 8 forming the nozzle 9, and cooling water or cooling air is forced to flow through the cooling pipe 12, and an anchor is attached to the cooling pipe 12. 11 may be provided. As a result, the cooling effect of the anchor 11 is further improved, so that high-temperature corrosion of the anchor 11 can be prevented and the refractory 8 can be prevented from falling off.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Ignition furnace burner 4 using slit nozzle
The water cooling jacket 10 is arranged so that the outer surface of the steel shell 16 of the mixing section 7 is submerged in the cooling water 17 in the water cooling jacket 10, and the cooling water in the water cooling jacket 10 is circulated using a pump, and the sintering is performed. The machine was put into operation. The flow rate of circulating cooling water is about 1.
It was 53 m / sec.

As a result, the cooling effect of the shell of the burner 4 was improved, and the thermal deformation of the burner 4 could be prevented, and a stable flame was obtained even for a service period of 4 years or more. By stabilizing the flame in this way, the ignition characteristics to the raw material layer 3 are also stabilized,
The decrease in yield due to poor ignition could be avoided. Although the example using the slit nozzle has been described here, the burner 4 is not limited to a specific configuration. For example, a plurality of cylindrical burners (so-called nozzle mix type burners) or the like that mix fuel gas and combustion air by swirling the swirling blades are arranged in the width direction, and the mixing section of each cylindrical burner is cooled by a water cooling jacket. Has the same effect.

[0013]

According to the present invention, since the cooling effect of the burner for the ignition furnace is improved and the deformation of the burner can be prevented, a stable flame can be obtained, and the operation can be stabilized and the yield can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an ignition furnace burner of the present invention.

FIG. 2 is a sectional view showing an example of an ignition furnace burner of the present invention.

FIG. 3 is a sectional view showing a main part of the ignition furnace.

FIG. 4 is a sectional view showing an example of a conventional burner for an ignition furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pallet truck 2 Ignition furnace 3 Raw material layer 4 Burner 5 Combustion air header 6 Fuel gas header 7 Mixing section 8 Refractory 9 Nozzle 10 Water cooling jacket 11 Anchor 12 Cooling pipe 13 Refractory support rib 14 Fuel gas flow path 15 Combustion air Channel 16 Steel 17 Cooling water

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K017 DF02 DF06 3K065 TA08 TC04 TD05 TH05 TM08 TP10

Claims (2)

[Claims] 1. A mixing device having a fuel gas flow path and a combustion air flow path, wherein fuel gas ejected from the fuel gas flow path and combustion air ejected from the combustion air flow path are mixed and burned. A sintering machine ignition furnace burner having a nozzle for injecting the flame by the combustion at the lower end of the mixing section, wherein a water cooling jacket in contact with the steel shell of the mixing section is provided. Burner for ignition furnace. 2. A cooling pipe through which cooling water or cooling air flows is embedded in a refractory forming a nozzle of the burner, and an anchor for supporting the refractory is disposed on the cooling pipe. The burner for a sintering machine ignition furnace according to claim 1.