JP3001561B1 - Burner for producing inorganic spheroidized particles and burner device - Google Patents

Abstract

An object of the present invention is to provide a burner for producing inorganic spheroidized particles capable of stably producing high-quality inorganic spheroidized particles without soot adhering and depositing in the vicinity of a raw material powder ejection port of a burner. . SOLUTION: A first supply pipe 11 having an opening whose inner surface is divergent at the front end is disposed at a predetermined interval on an outer peripheral portion of a raw material powder supply pipe 10 having an opening whose inner surface diverges at the front end. A fuel gas flow path is formed between the second supply pipe and the supply pipe. The second supply pipe 12 has a straight-running portion at a tip thereof at a predetermined interval on an outer peripheral portion of the first supply pipe, and has a cooling water circulation flow path 13. A combustion gas flow path made of oxygen or oxygen-enriched air is formed between the first supply pipe and the second supply pipe, and a raw material powder supply pipe, a fuel gas flow path, and a combustion gas flow path; A burner for producing inorganic spheroidized particles, which is opened at the tip of the second supply pipe and at the bottom of the flame holding portion 14 formed of a concave portion provided to open ahead of the combustion gas flow path.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a burner for producing inorganic spheroidized particles and a burner apparatus for the burner.

[0002]

2. Description of the Related Art In recent years, a method has been known in which an inorganic powder material such as silica is passed through a combustion flame of a burner, melted, and then cooled to produce inorganic spheroidized particles.

As shown in FIG. 8, a first burner B is provided at a predetermined interval on an outer peripheral portion of a raw material powder supply pipe 1.
A supply pipe 2 is provided, a fuel gas flow path a ₁ is formed between the supply pipe 2 and the raw material powder supply pipe 1, and a cooling water circulation flow path is provided at a predetermined interval on an outer peripheral portion of the first supply pipe 2. 4 disposed a second supply pipe 3 provided with the first, oxygen or oxygen-enriched air between the second supply pipe (hereinafter, referred to as combustion gas) to form a flow path a _2. Further, the second supply pipe 3 is formed so as to protrude forward from the raw material powder supply pipe 1 and the first supply pipe 2 to form a flame holding section 5. In this burner B, the raw material powder from the raw material powder supply pipe 1 is passed through a combustion flame of a mixed gas of a fuel gas and a combustion gas, and is melted to be spherical. A high-temperature combustion gas is drawn into the flame holding portion by a vortex based on the ejection of gas or the like to form a flame holding portion, and burners are stably burned to obtain stable inorganic spheroidized particles.

In Japanese Patent Application Laid-Open No. 7-48118, a single burner is used to uniformly supply a large amount of raw material powder to a combustion chamber from a large number of raw material powder ejection ports provided on a powder dispersion plate. There has been proposed a burner for producing inorganic spheroidized particles, which can process the raw material powder.

[0005]

However, in the former burner B, when the high-temperature combustion gas is drawn into the flame holding portion 5 by the eddy current, soot and raw material powder in the combustion flame are also drawn. Soot and raw material powder adhere to and accumulate near each fluid outlet at the burner end, and in some cases, this deposit deteriorates the flame holding function and not only makes the burner's original combustion unstable, but also causes this adherence. There is a problem in that soot is mixed into the raw material powder, which leads to deterioration of the quality of the inorganic spheroidized particles.

Further, in the latter burner, even if a part of the fluid ejection port is clogged, the number and position of the clogged fluid ejection port cannot be determined, and even if it is formed, the burner is not stopped. As long as clogging cannot be repaired, productivity is poor. Furthermore, when clogging occurs in part, the raw material powder moves to an unplugged fluid jet,
There is a problem that the raw material powder cannot be evenly dispersed in the combustion chamber, and the spheroidization rate is reduced.

In order to solve this problem, the burner may be composed of a plurality of burners. However, in general, this kind of burner requires a water-cooled structure because the furnace temperature is high. Therefore, when the burner is configured by the plurality of burners, there is a problem that the piping system of the cooling water becomes complicated.

Accordingly, the present invention is to stably produce inorganic spheroidized particles of good quality without soot or a mixture of soot and raw material powder adhering and depositing near the raw material powder ejection port of the burner. It is a first object of the present invention to provide a burner for producing inorganic spheroidized particles. In addition, if a plurality of burners are used, even if one burner is obstructed due to clogging or the like, it is possible to replace only the burner while continuing the operation of the remaining burners, and furthermore, it is possible to use one cooling water. A second object of the present invention is to provide a burner facility for producing inorganic spheroidized particles which requires only a piping system.

[0009]

In order to achieve the above object, according to the present invention, there is provided a burner for producing inorganic spheroidized particles, comprising: A first supply pipe having an opening with a divergent inner surface at the end at a predetermined interval is provided at an outer peripheral portion of the pipe to form a fuel gas flow path between the pipe and the raw material powder supply pipe, and the first supply pipe is provided. A second supply pipe having a straight running portion at a tip thereof at a predetermined interval on an outer peripheral portion of the pipe, and having a cooling water circulation flow path is disposed, and oxygen or oxygen is provided between the first supply pipe and the second supply pipe. A combustion gas flow path made of oxygen-enriched air is formed, and the raw material powder supply pipe, the fuel gas flow path, and the combustion gas flow path are formed at the distal end of the second supply pipe, and the combustion gas flow path is formed. The bottom of the flame holding section consisting of a recess provided to open ahead of the flow path It is obtained by a structure in which is opened to. In the second aspect, the burner equipment for producing inorganic spheroidized particles has an opening whose inner surface is flared at a predetermined interval on the outer periphery of a raw material powder supply pipe having an opening diverging at the end. A second supply pipe provided with a first supply pipe to form a fuel gas flow passage between the first supply pipe and the raw material powder supply pipe, and having a straight-moving portion at a distal end of the outer periphery of the first supply pipe at a predetermined interval; And the first,
A combustion gas flow path made of oxygen or oxygen-enriched air is formed between the second supply pipe and the raw material powder supply pipe, the fuel gas flow path, and the combustion gas flow path. At the front end, and open at the bottom of the flame holding section consisting of a recess provided to open forward from the combustion gas flow path, the second supply pipe at the rear end and the first supply pipe 1 Desorption means
A plurality of burners each having a structure in which a second desorbing means is provided at the rear end of the first supply pipe and the raw material powder supply pipe are concentrically housed in a casing having a burner mounting flange at the rear end. A tubular body containing the respective burners, which is closed at a rear end of a mounting flange of the casing, between the outer end of the supply pipe and an end face of the casing with an end face plate; Forming a cooling water circulation box with a partition plate that closes the gap, at a predetermined interval with the casing, and connecting the rear portion of the partition cylinder body that encloses each burner with a predetermined interval also to the end face plate, to the inner surface of the cylinder, The cooling water supply port is provided behind the connection portion, and the cooling water discharge port is provided in front of the connection portion.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 show an embodiment of a burner Br ₁ for producing inorganic spheroidized particles according to the present invention.

Reference numeral 10 denotes an opening 1 having a shape in which the inner surface is widened at the tip.
0a, the raw material powder supply pipe 1
From 0, for example, a raw material powder such as silica is supplied together with oxygen or oxygen-enriched air.

At the outer periphery of the raw material powder supply pipe 10, a first supply pipe 11 having an opening 11a having a divergent inner surface at the end at a predetermined interval is provided.
A fuel gas flow path P ₁ is formed between the fuel gas supply pipe 10 and the raw material powder supply pipe 10.

The outer periphery of the first supply pipe 11 has a straight opening 12a at a predetermined interval and a cooling water circulation flow path 13 therein. A second supply pipe 12 having a flame portion 14 is provided, and a combustion gas flow path P ₂ that is oxygen or oxygen-enriched air is formed between the first supply pipe 11 and the second supply pipe 12. I have.

The spout, which is the tip of the opening of each flow path, forms a part of the bottom 14 a of the flame holding section 14.
In addition, the tips of the ejection ports are open close to each other.

The first supply pipe 11 is shorter than the raw material powder supply pipe 10, and has a flange 16 provided at an end of the first supply pipe 11 and a flange 15 provided at the raw material powder supply pipe 10.
Bolts (both not shown) are attached through packing (both flanges 15 and 16 constitute a first attaching / detaching means). Similarly, the second supply pipe 12 is shorter than the first supply pipe 11 and has an end. 18 provided on the section and the first supply pipe 1
1 (the two flanges 17 and 18
And a burner Br ₁ for the production of inorganic spheroidized particles.

A plurality of guides (not shown) are provided at the outer periphery of the leading end of the raw material powder supply pipe 10 and the first supply pipe 11, and the first supply pipe 11 and the second supply pipe 1 are provided respectively.
A flow path at a predetermined interval is formed in contact with the inner surface of the second.

Further, a fuel gas supply port 19 is provided rearward of the flange 17 of the first supply pipe 11 so as to be connected to the second supply pipe 1.
A combustion gas supply port 20 is provided at a rear portion of the cooling water supply passage 2, and cooling water supply / discharge means (not shown) for the cooling water circulation flow path 13 is provided in the second supply pipe 12.

The burner Br ₁ for producing inorganic spheroidized particles is:
Because comprising the configuration, it is ejected from the opening 10a of the raw material powder from the raw material powder supply pipe 10 is supplied with oxygen or oxygen-enriched air, the fuel gas from the fuel gas passage P _1, The combustion gas each is ejected from the combustion gas channel P ₂ and ignited by an unillustrated ignition device.

[0019] In this case, the fuel gas, for ejecting the flared to the combustion gas blown in straight direction from the combustion gas channel P ₂ from the fuel gas channel P _1, sufficiently with the combustion gas To form a combustion flame.

On the other hand, the opening 1 where the raw material powder also spreads out
In order to squirt from 0a, part of the raw material powder is mixed with the fuel gas, and the remaining raw material powder is wrapped and melted for a long time in the combustion flame, and then cooled outside the flame to form a spherical shape. Particles. By the way, due to the discharge flow rate of the combustion gas, a vortex is formed in the flame holding section 14,
Although soot and the like tend to adhere to the flame holding portion, the soot itself burns due to the high oxygen concentration in the vortex portion, and soot does not adhere and accumulate in the flame holding portion 14.

Further, the tip of the fuel gas flow path P _{1 and} the tip of the combustion gas flow path P ₂ , the tip of the fuel gas flow path P ₁ and the opening 10 a of the raw material powder supply pipe 10 are all close to each other. For,
The eddy current is not easily generated, and even if it is generated, soot and the like do not adhere and accumulate near the ejection port. In other words, the burner Br ₁ for producing inorganic spheroidized particles always stably burns, and can produce spheroidized particles having uniform properties.

Next, a burner apparatus Br for producing inorganic spheroidized particles according to a second embodiment will be described with reference to FIGS.

Burner apparatus Br for producing inorganic spheroidized particles
Generally comprises a plurality of burners Br ₂ , a flame monitoring device F,
It comprises a casing 25, an end face plate 35 and a cooling water supply / discharge means 27.

The burner Br ₂ is the same as the burner Br ₁ of the first embodiment except that it does not include the cooling water circulation flow path 13 provided in the second supply pipe 12, and the other configuration is the same. The same reference numerals are given to the parts and the description is omitted. The length is of two types, long and short.

The plurality of burners Br ₂ are disposed in the casing 25. The casing 25 has a mounting flange 26 at a rear end thereof on a furnace wall. A supply / discharge means 27 is provided. The cooling water supply / discharge means 27 is provided in the casing 2.
5. First partition plate 28, cylindrical body 29, partition cylindrical body 30, intermediate partition plate 31, second partition plate 32, cooling water supply / discharge ports 33a, 33
b and the end face plate 35.

The first partition plate 28 has a through-opening of the same diameter as the plurality of burners Br ₂ and a cylindrical flame monitoring device F disposed at the center thereof.
The outer peripheral portion is attached to a cylindrical body 29 having one end attached to the mounting flange 26. Further, as described below, the partition cylinder 30 incorporates all the burners Br ₂ and the flame monitoring device F, and the rear end thereof is an intermediate partition plate which is an annular body attached to the inner periphery of the cylinder 29. 3
It is attached to 1. Moreover, the the distal end portion of the partition cylinder 30 and a second partition plate 32 having the burner Br ₂ and a flame monitoring device large-diameter opening 32a than the diameter of F. Further, a cooling water supply port 33a is provided on the rear side of the intermediate partition plate 31 of the cylindrical body 29, and a cooling water discharge port 33b is provided on the front side.

The end plate 35 is attached to the front end surface of the casing 25, and has an opening 35a having substantially the same diameter as each burner Br ₂ and the outer diameter of the flame monitoring device F.

The inorganic spheroidized particles having the above structure
The manufacturing burner device Br includes the plurality of burners Br._TwoAnd fire
Through the opening provided in the first partition plate 28 with the flame monitoring device F
The tip portion is flush with the opening 35a of the end face plate 35.
And each burner Br _TwoAnd the flame monitoring device F
Welding the fitting part with the first partition plate 28 and the end face plate 35
Assemble by integrating with

Next, the operation of the burner apparatus Br for producing the inorganic spheroidized particles will be described. First, the burner apparatus Br for producing inorganic spheroidized particles is installed vertically through the mounting flange 26 such that the tip is inside the furnace.

The second supply pipe 12 constituting each burner Br ₂ and the flame monitoring device F are charged and welded into the opening of the first partition plate 28 and the opening 35a of the end face plate 35, and are installed. Thereafter, the first supply pipe 11 and the raw material powder supply pipe 10
May be charged into the second supply pipe 12.

Then, while supplying cooling water from the cooling water supply port 33a, the raw material powder and oxygen or oxygen-enriched air, fuel gas, and combustion gas are supplied to each burner Br ₂ and ignited. In this case, the cooling water is supplied to the first partition plate 28.
From the space formed by the intermediate partition plate 31 and the
0 while cooling the second supply pipe 12 of each burner Br ₂ inside and the outer periphery of the flame monitoring device F to reach the lower part,
The cooling water is discharged from the space R formed between the end portion of the casing 0 and the end face plate 35 through the flow path P formed between the casing 25 and the partitioning cylinder 30 from the cooling water discharge port 33b. That is, the outer periphery of each burner Br ₂ and the flame monitoring device F is wrapped in the cooling water, and is completely protected from the high-temperature atmosphere in the furnace.

In the operation, it is not necessary to use all the burners Br _2, and the burner to be used may be determined according to the production amount of the inorganic spheroidized particles.
In each burner Br ₂ , the raw material powder supply pipe 10 and the first supply pipe 11, and the first supply pipe 11 and the second supply pipe 12 are detachable by the mounting flanges 15, 16, 17, and 18, respectively. Even if the burner Br ₂ inside is clogged or the like, the raw material powder supply pipe 10 for the burner Br ₂
Alternatively, the first supply pipe 11 can be removed for repair.

[0033]

As is apparent from the above description, claim 1
In the burner for producing inorganic spheroidized particles according to the invention, the raw material powder spreads from the center of the flame holding portion provided in the second supply pipe disposed at the outermost periphery, and the fuel gas spreads from the outside thereof. The combustion gas, which is oxygen or oxygen-enriched air, is ejected from the outermost periphery in a cylindrical shape. Therefore, the fuel gas is sufficiently mixed with the combustion gas to burn, and the raw material powder is sufficiently heated and surrounded by the combustion flame to be melted and spheroidized.

In addition, the soot and raw material powder return to the flame holding section together with the combustion gas due to the eddy current generated by the ejection of the combustion gas. Because of the close proximity, the burner performs stable combustion without soot or the like adhering to and accumulating on the flame holding part, so that good inorganic spheroidized particles can be obtained with a high spheroidization rate of 99.8% or more. Can be.

According to the burner apparatus for producing inorganic spheroidized particles according to the second aspect of the present invention, in addition to the effect of the first aspect, each burner is cooled by one cooling water circulation means, so that the structure is simple. In addition, even if a trouble such as clogging occurs in one of the burners, the burner can be removed and the raw material powder supply pipe or the first supply pipe can be removed and repaired / replaced while the operation of the other burner is maintained while the burner is detached. For,
A decrease in production efficiency can be minimized.

[Brief description of the drawings]

FIG. 1 is a schematic view of a burner for producing inorganic spheroidized particles according to the present invention.

FIG. 2 is an enlarged sectional view of a distal end portion of FIG.

FIG. 3 is a schematic view of a burner device for producing inorganic spheroidized particles according to the present invention.

FIG. 4 is a partial sectional view of FIG. 3;

FIG. 5 is an enlarged sectional view of a main part of FIG. 4;

FIG. 6 is a partially enlarged cross-sectional view of a tip portion of the burner device of FIG. 3;

FIG. 7 is a front view of a second partition plate.

FIG. 8 is an enlarged sectional view of a tip portion of a conventional burner for producing inorganic spheroidized particles.

[Description of References] Br ₁ , Br ₂ ... burner, Br ... burner device, 10 ... material powder supply pipe, 11 ... first supply pipe, 12 ... second supply pipe, 1
3 ... cooling water circulation channel, 14 ... flame holding part, 10a, 11a,
12a ... opening, 15, 16, 17, 18 ... flange, 2
5 Casing, 26 mounting flange, 27 cooling water supply / discharge means, 28 first partition plate, 29 cylinder, 30 partition cylinder, 31 intermediate partition plate, 32 second partition plate, 33a Cooling water supply port, 33b ... Cooling water discharge port, 35 ... End face plate, 3
5a: Opening.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI F23D 14/78 F23D 14/78 A

Claims (2)

(57) [Claims] 1. A raw material powder supply pipe having an opening whose inner surface is divergent at an end thereof is provided at a predetermined interval on an outer peripheral portion of the raw material powder supply pipe having an opening whose inner surface is divergent. A second fuel gas flow path is formed between the first supply pipe and the first supply pipe.
A supply pipe is provided to form a combustion gas flow path made of oxygen or oxygen-enriched air between the first supply pipe and the second supply pipe, and the raw material powder supply pipe, the fuel gas flow path, The combustion gas flow path is opened at the bottom of a flame holding portion formed of a concave portion provided at the front end of the second supply pipe and provided to open forward from the combustion gas flow path. Burner for producing inorganic spheroidized particles. 2. A raw material powder supply pipe having an opening with an inner surface diverging at a predetermined interval is provided at an outer peripheral portion of the raw material powder supply pipe having an opening with an inner surface diverging at the tip. A first supply pipe having a rectilinear portion formed at a predetermined interval on an outer peripheral portion of the first supply pipe, the fuel gas flow path being formed between the first and second supply pipes; A gas flow path for combustion comprising oxygen or oxygen-enriched air is formed between the raw material powder supply pipe, the fuel gas flow path and the combustion gas flow path, at the tip of the second supply pipe, Further, an opening is provided at the bottom of a flame holding portion formed of a concave portion provided so as to open ahead of the combustion gas flow path, and a first attaching / detaching means is provided at a rear end of the second supply pipe and the first supply pipe. The second supply / detachment means is provided at the rear end of the first supply pipe and the raw material powder supply pipe. A plurality of burners are concentrically housed in a casing having a burner mounting flange at the rear end, and the outer side of the end of each second supply pipe and the end face of the casing are closed with an end plate, and the burner is located rearward from the mounting flange of the casing. A cooling water circulation box formed by a cylindrical body containing each of the burners, and a partition plate attached to a rear end of the cylindrical body and closing between the respective burners, at a predetermined interval from the casing, and A rear part of the partition cylinder body for enclosing each burner is connected to the inner surface of the cylinder body at predetermined intervals with the face plate, and a cooling water supply port is provided behind the connection part and a cooling water discharge port is provided in front of the connection part. Burner device for producing inorganic spheroidized particles.