JPH01150709A - High speed exhaust burner - Google Patents

Abstract

PURPOSE:To eliminate vibrating combustion and make it possible to effect complete combustion by providing a ceramic multihole plate which has a spark ring on the central shaft of a burner internally in the inside of the flange section of a tapered burner cylinder and passing the tip end section of a spark rod through the spark ring. CONSTITUTION:A gas that flows in from a gas introducing tube 19 is discharged out into a mixing chamber 22 from a gas discharge hole 9 after passing through a gas reservoir 10 to be mixed with air that flows in from an air introducing pipe 8. The mixture gas passes through the three-dimensional multihole spherical shell in a multihole plate. The mixture gas is more uniformly mixed by branching off step by step and then discharged to the outside of the multihole plate 15 in the state of complete mixing. When the mixture gas which was mixed primarily in the mixture chamber 22 goes through the hole of a spark ring 17, the mixture gas is ignited in the hole with the sparks developed between a spark rod 13 and spark ring 17. The flame made by the ignition goes round the tip end of the spark ring 17 and ignites the mixture gas which is discharged from the multihole plate 15 and the gas burns. This multihole plate 15 is a ceramic multihole body of multisphere shell connection type, and its porosity is 70-98%. The diameter of a hole in the sphere is preferably 2-7mm.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a gas-fired high-speed: irradiation burner used as a heating mechanism for small-sized hot air generating furnaces or general industrial kilns.

Conventional Technique T Conventionally, electric heating elements and oil burners have been the main heating sources for small-sized hot air generating furnaces or general construction kilns, but in recent years, electric heating elements and oil burners have been used to evenly heat the interior of industrial kilns. , N
In order to completely reduce Ox generation and prevent air pollution, LN
High-speed injection burner for gas combustion that uses gas such as G as fuel (
(hereinafter simply referred to as high-speed burners) are gradually beginning to be adopted.

When fuel gas is combusted using a high-speed burner, a high-speed circulating heat flow is formed in the furnace, and the object to be heated, such as the A-piece, can be heated uniformly and efficiently. By injecting combustion gas and utilizing the ejector effect,
Involves exhaust gas and low-temperature atmosphere gas from inside the furnace 300
~17006e of hot air can be sent into the furnace to circulate the gas in the furnace and evenly raise the temperature of the industrial furnace.

As shown in Fig. 2, the conventional high-speed burner has a cylindrical shape with a tapered tip, and fuel gas (hereinafter simply referred to as gas) is press-fitted from the gas introduction W19, and the gas ejection hole 9 (
The air is blown out centripetally from small holes arranged in the circumferential direction, and mixed with air introduced from the air introduction hole 8 in the mixing chamber 22. When a spark is generated between the spark rod 13 and the lining member 18 protruding inside the tube 1, the mixed gas (not shown) is ignited, burns at the combustion stage 21, and is discharged from the burner opening 4. High speed (200-250 +r)/sec,
), high-temperature gas is injected into the furnace 11 times.

Problems to be Solved by the Invention However, in this type of burner, the combustion chamber 21 is generally very small, so it is difficult to use high-load lights that consume large amounts of gas.
(1x 10'~5 x 108Kcal/m'h
), the initial ignition is very difficult and the gas is incompletely combusted, resulting in so-called oscillatory combustion, resulting in abnormally high combustibility, which can damage the work area and generate NOx or CO gas. However, there are drawbacks such as air pollution.

Means for Solving the Problems In order to eliminate these drawbacks, the present inventors have made extensive studies and have focused on ceramic porous bodies, which have recently begun to be used in fuel cells, etc. As a result of extensive research, we have completed the present invention, and the gist of the invention is, as mentioned above, that the tapered burner tube and the burner casing, in which the air-fuel mixture is installed coaxially, are connected to the respective flanges. In the crystal velocity injection burner connected through the shin burner central axis direction, a ceramic perforated plate having sparkling is installed inside the flange part of the tapered burner cylinder, and the air-fuel mixture chamber and the burner casing are The present invention provides a high-speed injection burner characterized in that the tip of a spark rod passing through the center is inserted into the spark ring.

The present invention will be explained in more detail below based on the drawings showing preferred embodiments.

In FIG. 1 showing an embodiment of the present invention, li- is a cylindrical body made of pre-drawn gold or ceramics, and consists of a burner cylinder 2 at the front and a burner casing 3 at the rear. The burner cylinder 2 generally has an inner diameter of 65 to 70 mm,
It is a cylindrical piece made of heat-resistant steel with a diameter of 300 to 400 mm and a thickness of about 10 blades.The tip is tapered, and the inner diameter is 10 to 20 mN (with a D burner opening 4 and a The 7 flange 5 for connection is glued.The burner casing 3 has the same inner diameter as the par casing 2 and a length of 100 to 150 nm.
It is usually a cylinder with a 2!1 back, and one end has 7 U/J5
' is provided around the circumference, and the other end (rear end) is closed with a rear plate 6. 7 is provided with a burner casing 3 on the cover 6.
and 8 coaxial inner surfaces made of ordinary steel, with an air introduction pipe protruding from the 1811 end thereof, and 9 a double pipe part (gas reservoir 10) with the burner casing 3. , 11 is a gas ejection hole circumferentially arranged in a slightly parallel direction, and 11 is a gas outlet
12 is an electrically insulating material made of ceramics or the like that is removably attached to the rear end of the inner cylinder 7; The spark rod is made of Ni-Cr, and the outside is protected by a well-known high-alumina ceramic pipe. 14 is a town heating unit installed in the burner tube 2;
An annular support member 15 made of ceramic or ceramic is a circular perforated plate with a thickness of 10 to 20 mm, which is fitted into the burner nozzle 2 through a well-known ceramic paper 16. .

This perforated plate 15 is of the present invention! To explain in more detail, this porous plate is a well-known ceramic porous body of the porous spherical shell connection type.
In recent years, it has been used in various loincloth bathing filters and energy-saving breathable M information panels, etc. Generally, its porosity is 70 to 98%, and the pore diameter of the spherical shell (not shown) is (Cell size) is preferably 2 to 7n.

This is because when the porosity is less than 70%, when performing high-load combustion, the pressure loss becomes large and the amount of gas passing through is insufficient, the temperature cannot be increased as expected, and a high-pressure blower is required. If the pore diameter is less than 2 mm, as will be described later, the gas and air injected into the spherical shell at high speed cannot be completely mixed, resulting in incomplete combustion.
This is because the strength is not sufficient and the service life is shortened.

In addition, regarding the thickness of the perforated plate 15,
In terms of strength from the relationship between porosity and spherical shell diameter, it is 10 to 2
0 is preferable. With 101 red skin, there is a risk of damage due to gas pressure if used for a long time.
Gas mixing is insufficient.

If the length exceeds 20, gas, etc. will have a hard time passing through, and it will not be possible to light the island load.

Further, 17 is a sparkling ring made of well-known heat-resistant steel or ceramics, and generally has an outer diameter of 10i.
A circular piece with a length of approximately 2 to 3 mm longer than the thickness of the perforated plate 15 is inserted into the hole drilled at the center of the perforated plate 15 with fire-resistant mortar (not shown) or the like. The tip is pressed inward and fixed so that it protrudes 2 to 3 mm. If the protruding length is outside this range, sparkling 17
The above range is preferable because the flame ignited inside the perforated plate 15 is unlikely to ignite the mixed gas ejected into the perforated plate 15. 18 is an electric wire member, generally,
An integrally formed piece made of the same material as the spark ring 17 is sandwiched between the burner cylinder 2 and the burner casing 3 by tightening bolts and nuts, similarly to the perforated plate 15 described in @TI.

Next, the functions and effects of the high-speed burner of the present invention will be explained based on an actual case where gas is used.

The gas flowing in from the gas introduction pipe 19 passes through the gas reservoir 10 and is ejected from the gas ejection hole 9 into the mixing chamber 22, where it is mixed with the air flowing in from the air introduction pipe 8 to form a mixed gas (both not shown). 1- Formation, but because the contact time is very short, there are parts that are not evenly mixed, which conventionally caused oscillatory combustion.

However, in the product of the present invention, the mixed gas further passes through the so-called three-dimensional porous spherical shell of the perforated plate 15, and is mixed more evenly in a state where the mixed gas is branched one after another. The mixture is completely mixed and ejected to the outside of the perforated plate 15 in nine states. When the mixed gas primarily mixed in the mixing chamber 22 passes through the holes of the spark ring 17, the cylindrical body 1
When a spark is generated between the ground line 20 and the spark ring 17 by a conducting coil (not shown) provided between the spark rod 13 and the ground line 20 provided in the spark ring 17, the flame ignited therein surrounds the tip of the spark ring 17. , perforated plate 15
The mixed gas spewed out ignites and burns.

The present invention has the technical structure as described in HrT, and the effects obtained are as follows: The mixed gas has a uniform flow velocity distribution, so it ignites smoothly and has a small Even in the combustion space 21, complete combustion can be achieved without vibrational combustion.

As a result, combustion noise has been reduced from 95 dB in conventional high-speed burners to less than 85 dB, significantly improving the indoor working environment, and reducing NOx gas emissions to 30% of conventional levels, reducing air pollution. It has a significant effect on prevention.

In addition, the tCl perforated plate 15 itself has a so-called flame-holding effect, so even if the gas and air ratios are varied over a wide range during use, stable and complete combustion can be achieved without misfires, making it suitable for actual operation. This has the advantage that burner management does not require much effort.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical cross-sectional view showing a fourth embodiment of the present invention, and FIG.
The figure is a schematic cross-sectional view of a joint showing a conventional embodiment. In the figure: 1: Cylindrical body, 12: Shimoki loquat acupuncture material. 2: Burner cylinder, 13: Spark rod. 3: Pana case/g, 14: Support member. 4: Pana opening, 15: Perforated plate. 5.5': Flange, 16: Ceramics R-bar. 6: Rear plate, 17: Sparkling. 7: Inner cylinder, 18: Guide ■) member. 8: Air introduction pipe, 19: Gas introduction pipe. 9: Gas vent, 20: Earth line. 10: Gas reservoir, 21: Combustion chamber. 11: Partition plate, 22: Mixing chamber.

Claims (1)

[Claims] In a high-speed injection burner in which a tapered burner cylinder and a burner casing coaxially provided with an air mixture chamber are connected via respective flanges, a ceramic perforated plate provided with sparkling in the direction of the central axis of the burner is arranged in the tapered shape. A high-speed injection burner, characterized in that a spark rod is disposed inside a flange of a burner cylinder and passes through the air mixture chamber and the center of the burner casing, and the tip of the spark rod is inserted into the spark ring.