JP2558579B2 - Burner device with dilution air passage - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention is fine ceramics firing furnace BACKGROUND OF THE Lost relates to a burner apparatus for industrial furnaces wax firing furnace or the like, the dilution air passage with the burner apparatus for channeling air dilution around the combustion cylinder Regarding

[0002]

2. Description of the Related Art Compared to general ceramics, fine ceramics are molded by mixing a large amount of organic plastics and binders because the raw materials used have no plasticity or bonding properties. For this reason, it is necessary to burn this organic substance when firing in a fine ceramic firing furnace, but the molded body is hardened at a high density so that it does not burn easily.

If the temperature gradient during heating of the molded body is large, cracking occurs and the product becomes defective.
The temperature gradient at the time of temperature rise should be as small as possible, and the baking should be performed slowly under the condition of an appropriate oxygen concentration.

Similarly, in the burning furnace for lost wax, a sufficient oxygen concentration is required to completely burn the wax remaining in the mold in the burning after dewaxing. That is,
Both of them need to have a sufficient oxygen concentration only in an arbitrary range during the temperature rise of firing, and to be able to arbitrarily set a temperature gradient during the temperature rise.

Conventionally, as a method of lowering the temperature of the gas flow by mixing air with combustion exhaust gas, a pair of corresponding holes provided in the refractory portion with respect to the axis of the burner orifice is provided with a pair of pipes, and pressurized air is supplied to the pipes. There is a burner device for a furnace (see Japanese Patent Publication No. 55-9603) in which a source is communicated, a pipe outlet is provided on the downstream side of a refractory portion, and diffused air is introduced.

[0006]

In the structure of the burner device shown in the prior art, the air cannot be rectified over the entire circumference, so that it cannot be sufficiently mixed and diluted with the combustion exhaust gas, so that the mixture of the combustion exhaust gas and the air is biased. However, since the air is sent by a pipe, the refractory portion cannot be sufficiently cooled, and no measures have been taken against cracks in the refractory portion, so there is a problem that it cannot withstand long-term use.

[0007] The present invention previously-mixed on the outer circumference of the combustion tube of the gas burner, rectifying the dilution air constitute air passages for dilution provided dilution mixing tube having a plurality of concave grooves and convex on the inner surface is not a homogeneous mixture diluted with combustion exhaust gas, the combustion barrel is cooled, to provide a dilution air passage with the burner device capable long-term use to support the combustion cylinder at the protrusion.

[0008]

DISCLOSURE OF THE INVENTION A burner apparatus with a dilution air passage according to the present invention is a premixed burner apparatus in which fuel gas and primary air are mixed, and secondary air for combustion is supplied by a flame stabilizer for combustion. as the inner and outer double pipe having a burner body 1 and the combustion secondary air inlet 2 for dilution air inlet 3, the inner tube to secure the combustion cylinder 4 of elongated, the flue gas of the tip on the outer tube dilution mixing tube elongated having a plurality of grooves 7 and the convex surface 8 in the axial direction of the inner periphery to the mixing chamber 6 to mix diluting air for dilution 5
With a convex surface 8 of the inner surface as well as connected in contact with the outer circumference of the combustion liner 4, forming a plurality of dilution air feed passage 9 in communication with the dilution air inlet 3 of the burner body 1, the dilution air As rectification, it is supplied to the combustion exhaust gas in the tip mixing chamber 6.

[0009] diameter of the distal end burner port 10 of the mixing chamber 6 is diluted mixture cylinder 5 focuses tapered mixing diluting the combustion exhaust gas and a rare Shakusora gas
Was a flame port outlet and the same diameter or slightly smaller diameter of the combustion tube 4, in which so as to enhance the mixing effect by increasing the flow rate of the dilution air.

[0010]

SUMMARY OF] According to the invention, dilution mixing tube 5 has become a comb the inner surface in contact with the outer circumference of the combustion tube 4 having a plurality of irregularities, the convex surface 8 is in contact with the outer circumference of the combustion tube 4 combustion cylinder 4 in the
The bearing, groove 7 is a flow path for air dilution, air introduced from the dilution air inlet 3 of the burner body 1 is empty for dilution of a plurality of grooves 7 of diluted mixed <br/> tube 5 The air is rectified and flows through the air supply passage 9. And is discharged to the dilution mixing tube 5 of the tip portion of the mixing chamber 6 rectified dilution air with the combustion cylinder 4 is mixed and diluted to uniformly wrap the combustion exhaust gas discharged from the flame hole 10 from the furnace at.

[0011] Further, if squeezing mixing chamber 6 to mix diluting air for dilution and combustion exhaust gas, can be increased mixing effect by increasing the flow rate of the dilution air with the flue gas.

[0012]

In EXAMPLES 1 and 2, 1 denotes a burner body of previously-mixed burner, combustion secondary air passage 11 inside the inner and outer double pipe, the dilution air stream passage 12 coaxially outwardly provided, to secure the combustion cylinder 4 of elongated on the inner tube.

[0013] 5 the dilution mixing tube of ceramic or the like, parallel to a plurality of grooves 7 and the convex surface 8 the air for dilution and combustion exhaust gas to the inner periphery of the axial direction to the mixing chamber 6 to mix diluting the tip straight in providing, the diluted mixture tube connected to the outer tube of the burner body 1, supporting the combustion cylinder in contact with the convex surface 8 of the inner surface to the outer circumference of the combustion tube 4, a plurality of grooves 7 and the combustion cylinder 4 by forming a plurality of dilution air feed passage 9. Although the concave groove 7 is linear in the embodiment, it is not limited to this and may be spiral.

[0014] 6 is a mixing chamber for mixing diluting air for dilution and combustion exhaust gas is provided in the vicinity of the tip of the diluted mixed tube 5 is provided a flame port 10 at its tip. The mixing chamber 6 is squeezed into a taper 1
The diameter D 0 is the same diameter compared to the flame diameter D ₁ of the combustion cylinder 4.

[0015] Although the diameter D ₁ of the diameter D and the combustion tube of the burner port 10 is a same diameter in the embodiment is not limited thereto, slightly above the combustion cylinder D ₁ the diameter D of, for example, the flame ports 10 It may have a small diameter.

A burner head 15 having a primary air passage 13 and a fuel gas passage 14 is fixed to the center of the base end of the burner body 1, and the burner is passed through the inside of the burner body 1 inside the secondary air passage 11 for combustion. Fuel gas passage 14 of head 15
To connect the fuel gas pipe 16, and the combustion secondary air flow path between the combustion tube 4 at the front end with the tip of the fuel gas pipe 16 is bored a plurality of secondary air holes 19 in the peripheral wall The cup-type flame stabilizer 18 having the barrier plate 20 is fixedly installed.

The primary air pipe 21 is connected to the primary air passage 13 by inserting the fuel gas passage 14 and the center of the fuel gas pipe 16 which are connected to each other, and the tip of the primary air pipe 21 is placed in the flame stabilizer 18. A gas nozzle 22 is provided so as to project and face the fuel gas pipe 16 by displacing a slit at an arbitrary angle with respect to the center, and an ignition plug 23 is provided near the gas nozzle.

Since the present invention has the above-mentioned configuration, the primary air is supplied from the primary air pipe to the fuel gas swirling and flowing from the gas nozzle in the mixing chamber in the flame stabilizer 18, and the fuel gas is mixed with the fuel gas. Secondary air flow passage 17 for combustion through the peripheral wall
Secondary air flows in, primary mixes and ignites and burns,
At the same time, the weir plate 20 accelerates a part of the secondary air and mixes it with the combustion gas that has been primarily mixed to promote combustion.

[0019] for dilution in the combustion exhaust gas that has burned in the combustion cylinder of this
The air is supplied through a plurality of dilution air feed passage 9 of the inner peripheral surface of the diluted mixed tube 5 via the flow path 12 from the inlet 3, to cool the combustion <br/> sintered tube, the striped Rectified dilution air
The mixing diluted jetted to the mixing chamber 6 of the front end portion of the diluted mixture tube 5.

The diluted air becomes a resistance between the streaks, and is uniformly dispersed and rectified so that it is wrapped around the combustion exhaust gas and uniformly mixed and diluted.

[0021] Also, it is possible to convex 8 of the inner peripheral surface of the diluted mixture cylinder 5 is in contact with the combustion tube 4, support the combustion cylinder 4.

Furthermore, fully mixed and diluted by increasing the flow rate of the dilution air and the combustion exhaust gas a tip flame hole 10 to focus tapering the mixing chamber 6 as flame hole outlet the same size or slightly smaller diameter of the combustion tube 4 be able to.

[0023]

Effects of the Invention According to the present invention, since a plurality of dilution air passages provided with a plurality of grooves and convex in the axial direction of the inner peripheral surface of the dilution mixing tube, all around the air for dilution Evenly distributed over
Rectifies the streak can jetted into the mixing chamber of the tip of the diluted mixed cylinder and be mixed diluted sufficiently wrapped evenly flue gas combustion cylinder.

In addition, the fine ceramics firing furnace,
If only supplying dilution air arbitrary range in the middle heating of firing in lost wax for firing furnaces such as a mixture diluted wraps the combustion exhaust gas of the combustion cylinder, a desired flue gas temperature as a sufficient oxygen concentration to obtain The stirring ability in the furnace in the low temperature region can be increased. Further, since the combustion exhaust gas is diluted with the dilution air, aldehydes are not generated due to incomplete combustion.

[0025] Since the outer dilution air passage of the combustion barrel dilution air to cool the combustion cylinder flows, thereby improving the durability of the combustion cylinder.

[0026] Since the support combustion cylinder convex surfaces of the inner peripheral surface of the dilution mixing tube, even if cracks are entered combustion tube, it is possible to long-term use because it can keep its shape.

[0027] increasing the flow velocity of the combustion exhaust gas and the dilution air by a flame hole outlet and same diameter or slightly smaller diameter of the diameter combustion tube tip flame hole squeezed tapered mixing chamber of the tip of the diluted mixture cylinder Mixed dilution can be further increased.

[Brief description of drawings]

FIG. 1 is a sectional view of a burner device with a dilution air passage according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

1 burner body 2 combustion secondary air inlet 3 dilution air 4 combustion cylinder 5 diluted mixture tube 6 mixing chamber 7 groove 8 convex 9 dilution air supply passage 10 distal flame hole

Claims (2)

(57) [Claims] 1. A destination-mix gas burner, as inner and outer double pipe having a burner body (1) combustion secondary air inlet (2) and the dilution air inlet (3), the elongated in the inner tube The combustion cylinder (4) is fixed, and the combustion gas at the tip is diluted with the outer tube.
Connecting use air is mixed diluted mixing chamber (6) to the inner peripheral plurality of grooves (7) and convex (8) is provided with elongated diluted mixture <br/> barrel in the axial direction of the (5) comprising contacting the convex surface of the inner surface (8) on the outer periphery of the front Ki燃 <br/> sintered tube (4) with a plurality of air dilution in communication with the diluent air inlet (3) of the burner body (1) Burner device with dilution air passage, characterized in that it forms a supply passage (9). 2. A combustion exhaust gas from a dilution mixing cylinder (5) for dilution
Air mixture diluted mixing chamber (6) is dilution air tapering squeezed diameter combustion tube tip flame hole (10) (4) Same diameter or the burner port outlet according to claim 1, wherein slightly to a smaller diameter Burner device with passage.