JP2000346318A - Burner for manufacturing spherical particle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a good spheroidicity per fuel material unit even in the case of increasing a treating amount of a raw material powder by providing a diffusing means engaged within an end of a raw material powder supply tube and having an annular swirl vane and a shape extending from a center of the vane toward ahead. SOLUTION: The burner 1 for manufacturing a spherical particle comprises a combustion gas supply tube 11, a fuel gas supply tube 12, a flame holder 13 and a raw material powder supply tube 14. In this case, a combustion gas inlet is provided at a side face of a rear portion of the tube 11 and a fuel gas inlet is provided at a side face of a rear portion of the tube 12. A through port 21 of a burner tile 15 is formed at an ahead portion from an end face of the tube 11 in a converged shape. An annular swirl vane 2 is engaged within the end of the tube 14. and a diffusing means 3 of a truncated conical shape extended from a center of the vane 2 toward ahead is extended from the end of the tube 14 out of the tube.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner for producing spherical particles applied to a spheroidizing furnace for producing spherical particles such as spherical slag of incinerated ash or spherical silica.

[0002]

2. Description of the Related Art In recent years, a spheroidizing method has been known in which inorganic raw material powder such as silica or sewage sludge incineration ash is melted in a combustion flame of a burner and then cooled to form a spheroid. In a spheroidizing furnace to which this method is applied, a burner 10 for producing spherical particles shown in FIG. 4 is used.

The burner 10 generally comprises a combustion gas supply pipe 11, a fuel gas supply pipe 12, a flame holding plate 13, and a raw material powder supply pipe 14. The combustion gas supply pipe 11 has a tapered tip, and a combustion gas inlet 22 provided on the rear side surface. The fuel gas supply pipe 12 is disposed within the combustion gas supply pipe 11 at a predetermined interval from the combustion gas supply pipe 11, and has a plurality of straight gas injection holes opened at the tip of the combustion gas supply pipe 11. A fuel gas inlet 24 is provided on the rear side surface of the fuel cell 23. The flame holding plate 13 is connected to the fuel gas supply pipe 12.
Around the outer peripheral surface of the front end of the fuel gas supply pipe 12 at a position behind the gas ejection hole 23, a plurality of fuel gas supply pipes 12 are provided so as to project from the outer peripheral surface toward the inner peripheral surface of the combustion gas supply pipe 11. Has a through hole 25a. Raw material powder supply pipe 14
Is disposed within the fuel gas supply pipe 12 at a predetermined interval from the fuel gas supply pipe 12, has a rear end opening and serves as a raw material powder inlet 26, and a front end has a combustion gas supply pipe 1
1 is open in the tip. The burner tile 15 has a through-hole 21 with a tapered tip, and the tip of the burner 10 is located in the through-hole 21.

[0004] The combustion gas, for example, combustion air, flowing from the combustion gas inlet 22 into the space between the combustion gas supply pipe 11 and the fuel gas supply pipe 12 penetrates through the flame holding plate 13. Through a hole 25 a and a gap 25 b formed between the outer peripheral surface of the flame holding plate 13 and the inner peripheral surface of the combustion gas supply pipe 11, the fuel gas is jetted into the distal end portion of the combustion gas supply pipe 11 having a tapered shape. Further, the fuel gas supply pipe 1
The fuel gas, for example, propane gas, flowing into the space between the incineration ash supply pipe 14 and the incineration ash supply pipe 14 is ejected into the front end of the combustion gas supply pipe 11 through the straight gas ejection hole 23a.
The gas is ejected from the radial gas ejection holes 23b to the vicinity of the front surface of the flame holding plate 13, where it is mixed with combustion air to form a combustion flame. On the other hand, the raw material powder, for example, sewage sludge incineration ash is ejected from the supply port 26 of the raw material powder supply pipe 14 located at the center of the spherical particle production burner 10 together with the carrier air toward the combustion flame. The sewage sludge incineration ash is melted and spheroidized.

[0005]

In the case of the above-mentioned conventional burner 10 for producing spherical particles, the raw material powder is simply jetted toward the center of the flame together with the air for conveyance. Therefore, when the processing amount of the raw material powder is increased, the raw material powder is not evenly dispersed in the flame, and a tendency that a large amount of the raw material powder is concentrated in the center of the flame becomes remarkable. . As a result, there is a problem that the heat transfer efficiency in the central portion is deteriorated, and the spheroidization ratio of the raw material powder per unit fuel consumption is reduced.
On the other hand, a plurality of burners 10 for producing spherical particles are provided,
It is conceivable to distribute and supply the raw material powder so as to form a plurality of combustion flames, but in this case, the equipment becomes complicated,
A new problem of increasing the size arises. The present invention has been made with the object of eliminating such a conventional problem,
Even if the throughput of the raw material powder is increased, it is intended to provide a burner for producing spherical particles that maintains a good spheroidization rate per unit fuel consumption and does not cause the equipment to be complicated and large. is there.

[0006]

According to a first aspect of the present invention, there is provided a combustion gas supply pipe having a circular inner surface and a plurality of combustion gas supply pipes arranged at predetermined intervals in the combustion gas supply pipe. A fuel gas supply pipe having a radial gas ejection hole, a flame holding plate provided at a position behind the radial gas ejection hole of the fuel gas supply pipe, and having a plurality of through holes, and a predetermined interval in the fuel gas supply pipe. In a burner for producing spherical particles provided with a raw material powder supply pipe arranged with a circular shape, an annular swirler fitted into the tip of the raw material powder supply pipe and a central part of the swirler spread toward the front. And a diffusing means having a different shape.

Further, the second invention has a configuration in which a burner tile having an opening formed in a tapered shape is provided in addition to the configuration of the first invention.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 3 show a burner 1 for producing spherical particles according to the present invention, and portions common to the above-described burner 10 for producing spherical particles are denoted by the same reference numerals, and description thereof is omitted. This burner for producing spherical particles 1
The combustion gas supply pipe 11, the fuel gas supply pipe 12, the flame holding plate 13, and the raw material powder supply pipe 14 are also provided. A combustion gas inlet 22 is provided on a rear side surface of the combustion gas supply pipe 11. A fuel gas inlet 24 is provided on a rear side surface of the gas supply pipe 12. The through-hole 21 of the burner tile 15 is formed such that a portion ahead of a front end surface of the combustion gas supply pipe 11 is tapered. The gas ejection holes 23 provided at the end of the fuel gas supply pipe 12 extend radially in the lateral direction. The fuel gas outlet 23 may be provided with a straight gas outlet. The tip surfaces of the combustion gas supply pipe 11 and the raw material powder supply pipe 14 are formed to be substantially flush.

An annular revolving blade 2 is fitted into the distal end of the raw material powder supply pipe 14, and a truncated cone extending from the center of the revolving blade 2 toward the front from inside the distal end to the outside of the pipe. A diffusion means 3 having a shape is extended. Further, it extends through the annular plate 4 and the flame holding plate 13 closing the rear end of the space between the combustion gas supply pipe 11 and the fuel gas supply pipe 12, and extends near the outlet of the gas ejection hole 23. An ignition plug 5 for generating a spark at the outlet is provided. In addition, a flame monitor 6 and a sight hole 7 are provided on the annular plate 4.

Then, the combustion gas flowing from the combustion gas inlet 22 into the space between the combustion gas supply pipe 11 and the fuel gas supply pipe 12, for example, combustion air (eg, 60% of the total air amount) Are through holes 25a and gaps 25b of the flame holding plate 13
From the gas supply pipe 11 for combustion. Further, the fuel gas, for example, propane gas, flowing from the fuel gas inlet 24 into the space between the fuel gas supply pipe 12 and the raw material powder supply pipe 14 from the radial gas ejection hole 23 to the vicinity of the front surface of the flame holding plate 13. The gas supply pipe for combustion 1
The burner tile 15 is ejected to the opening at the front end of the burner tile 15 and flows downward while being mixed with the combustion air. A spark is generated by the ignition plug 5 at the tip end opening of the combustion gas supply pipe 11, and the gas mixture of the combustion air and the fuel gas starts burning.

On the other hand, the raw material powder, for example, sewage sludge incineration ash, which is transported from the raw material powder inlet 26 into the raw material powder supply pipe 14 together with the carrier air (eg, 40% of the total air amount), 2, it is swirled and spreads along the outer peripheral surface of the diffusing means 3 and blows forward through the through-hole 21 of the burner tile 15. The sewage sludge incineration ash is uniformly mixed and melted with the high-temperature combustion flame generated by the combustion of the mixed gas, and is spheroidized.
Spout from 1 into the furnace. As described above, in the burner 1 for producing spherical particles, the combustion flame is formed in the burner tile 15, and the sewage sludge incineration ash is diffused and ejected into the combustion flame, so that the heat of the combustion flame is reduced. The sewage sludge incineration ash is transmitted uniformly and quickly to the incineration ash efficiently, and the spheroidization rate of the sewage sludge incineration ash is accordingly improved.

Incidentally, regarding the flame holding of the combustion, the flame holding vortex 8 generated near the front portion of the flame holding plate 13 due to the combustion air passing through the through holes 25a and the gaps 25b of the flame holding plate 13 and the tapered shape. It is secured by the through hole 21. The components of the sewage sludge incineration ash include a polymer type and a lime type. Then, the high molecular component softens at about 1100 ° C. and starts melting at about 1150 ° C. On the other hand, the lime-based component starts melting at about 1200 to 1250 ° C. Needless to say, the temperature of the combustion flame described above must be equal to or higher than the melting point of the sewage sludge incineration ash.In general, the higher the combustion flame temperature, the higher the sewage sludge incineration ash spheroidization rate. The flame temperature is preferably set to 1700 ° C. or higher.

As the fuel gas, natural gas, propane gas, butane gas or the like is suitable. When blast furnace gas or the like having a low calorific value is used, 30 to 100% of the combustion gas and the carrier gas are used. The combustion flame temperature may be increased using oxygen-enriched air or pure oxygen. In some cases, combustion air preheated to 400 ° C. or higher may be used. The combustion flame can be monitored by the flame monitor 6, and the combustion can be visually confirmed through the sight hole 7. Although the case of sewage sludge incineration ash was described as the raw material powder in the embodiment, the raw material powder is not limited to this,
As long as the spheroidizing treatment is performed, the method can be applied to, for example, silica or the like.

[0014]

As is apparent from the above description, according to the first aspect, a combustion gas supply pipe having a circular inner surface and a plurality of radial gas ejection pipes arranged at predetermined intervals in the combustion gas supply pipe. A fuel gas supply pipe having a hole, a flame holding plate provided at a position behind the radial gas ejection hole of the fuel gas supply pipe, and having a plurality of through holes at a tip end thereof, and a predetermined interval in the fuel gas supply pipe. In a burner for producing spherical particles provided with a placed raw material powder supply pipe, an annular swirl blade fitted into the tip of the raw material powder supply pipe and a center part of the swirl blade spread toward the front. And a diffusing means having a shape. According to the second aspect of the invention, in addition to the configuration of the first aspect, there is provided a configuration having a burner tile having an opening formed in a tapered shape.

For this reason, since the raw material powder is diffused and ejected into the combustion flame, the heat of the combustion flame is uniformly and quickly transmitted to the raw material, and the raw material powder is efficiently melted. The spheroidization rate is also improved, and there is an effect that the equipment is not complicated and large.

[Brief description of the drawings]

FIG. 1 is a sectional view of a burner for producing spherical particles according to the present invention.

FIG. 2 is an enlarged partial sectional view showing a lower portion of the burner for producing spherical particles shown in FIG.

FIG. 3 is a plan view of the burner for producing spherical particles shown in FIG.

FIG. 4 is a sectional view of a conventional burner for producing spherical particles.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Burner for spherical particle production 2 Rotating blade 3 Diffusion means 11 Gas supply pipe for combustion 12 Fuel gas supply pipe 13 Flame holding plate 14 Raw material powder supply pipe 15 Burner tile

Continued on the front page F term (reference) 3K017 CA07 CB05 CD03 CD05 CE01 CE05 CH05 3K061 NB03 NB08 3K065 QC03 SA01 4G068 CA09 CB02 CC10 4G075 AA27 BB03 BD03 BD14 CA45 EB27 EC03 EE05 FB04

Claims (2)

[Claims] 1. A combustion gas supply pipe having a circular inner surface, a fuel gas supply pipe disposed at a predetermined interval in the combustion gas supply pipe, and having a plurality of radial gas ejection holes at a tip end thereof; For producing spherical particles, comprising: a flame holding plate having a plurality of through holes provided at a position behind the radial gas ejection holes of a pipe; and a raw material powder supply pipe arranged at a predetermined interval in the fuel gas supply pipe. In the burner, a spherical particle provided with an annular swirling blade fitted into the tip end of the raw material powder supply pipe and a diffusing means having a shape spreading forward from a center portion of the swirling blade. Burner for production. 2. The burner for producing spherical particles according to claim 1, further comprising a burner tile having an opening formed in a tapered shape.