JP2697155B2 - Burner plate - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner plate which is a burning part of a burner using radiant energy, and more particularly to an improvement of a surface combustion type burner plate.

[Prior art] A surface-burning type burner represented by a conventional Schwang burner or a sintered metal burner (a burner obtained by sintering fine metal powder) has an integral structure of a radioactive solid having air permeability and a burner body. Alternatively, it has a single-layer structure, so that a combustion zone is formed on the surface of the radioactive solid. In other words, the premixed gas that has passed through the interior of the radioactive solid burns in a layer that is very close to the exit surface, and the solid itself becomes a radiator with that energy, so that the flame does not rise from the surface of the radioactive solid. It burns on the surface. Therefore, it has the advantage that the energy of the fuel can be transmitted to the radiation surface very efficiently, and the surface temperature can be kept uniform.

The temperature distribution curve in the cross section of this burner main body is the fifth.
As shown in the figure, the temperature is extremely high in the portion of the combustion zone 4, and rapidly decreases toward the upstream side of the fuel gas, that is, the rear side of the burner body. Therefore, in the surface combustion type burner, the temperature at the surface becomes the highest, so the heat resistance of the surface,
Oxidation resistance is important in terms of burner durability and high load combustion.

[Problems to be Solved by the Invention] From such a viewpoint, in the related art, for example, a burner plate is formed by a sintered plate of ceramic fiber, but a single-layer sintered plate of ceramic fiber has a low mechanical strength. There was a problem that the area could not be made large because of inferiority.

On the other hand, the porosity of the conventional sintered metal powder plate is low (usually,
(Approximately 40 to 50%), and there is a problem in heat resistance and oxidation resistance of the surface portion. Therefore, there has been a problem that the surface temperature cannot be increased and high load combustion cannot be performed.

The present invention has been made in order to solve the above-mentioned problems, and can be made to have a large area, and furthermore, has excellent heat resistance and durability,
It is intended to provide a burner plate capable of high load combustion.

[Means for Solving the Problems] In order to achieve the above object, a burner plate according to the present invention comprises:
As the fiber material, ceramic fibers are used for the surface side, that is, the surface layer on the downstream side of the fuel gas, and metal fibers are used for the back surface layer on the upstream side.

[Operation] The burner plate of the present invention uses a ceramic fiber having excellent heat resistance and oxidation resistance, for example, an alumina fiber only in the surface layer of the high temperature portion forming the combustion zone, and uses the metal fiber in the back layer of the low temperature portion. For example, since the composite layer is sintered in two layers using stainless steel fibers, the mechanical strength of the back layer can be kept high by the metal fiber sintered body, so that the porosity can be increased, and And the surface load can be increased.

Further, in response to the above-described features of the back layer, the surface layer is improved in heat resistance and oxidation resistance by the ceramic fiber sintered body, so that high load combustion with a high surface temperature is possible and durability is improved.

Example An example of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a burner plate of the present invention, FIG. 2 is a front view showing a burner using this burner plate, and FIG. 3 is a side view thereof.

In the figure, reference numeral 1 denotes a burner plate, which is a composite sintered plate having a two-layer structure of a surface layer 11 of a ceramic fiber sintered body and a back layer 12 of a metal fiber sintered body. That is, as the fiber material, for example, alumina fiber is used for the surface layer 11 and the back layer 12 is used.
For example, stainless steel fiber of SUS316 is used. For these fibers, for example, long fibers having a fiber diameter of 12 μm and a fiber length of 50 mm are used.

To manufacture the burner plate 1, the alumina fiber layer of the surface layer 11 is superimposed on the stainless steel fiber layer of the back layer 12 and simultaneously sintered. In FIG. 1, reference numeral 13 denotes the surface layer 11 and the back layer 12 at this time.
Represents a mixed region.

The thickness of the surface layer 11 is sufficient to be 1 mm or less because the high temperature region due to the combustion zone 4 is small. This burner plate 1 has an outer diameter of 350 mm,
It is made by sintering into a 4mm thick disc.

As described above, the burner plate 1 has a high mechanical strength and a high porosity because the back layer 12 of the low-temperature portion is a metal fiber sintered body. The porosity can be as high as 95%.

FIG. 4 shows an electron micrograph (magnification: 10) of a cross section of the back layer 12.
0), and as can be clearly seen from the figure, fine voids 3 are uniformly provided by interlaced stainless steel long fibers 2.

Further, since the mechanical strength and the porosity of the back layer 12 can be increased, the area of the burner plate 1 can be increased, and the load per unit area (surface load) can be increased.

Next, since the surface layer 11 forms a ceramic fiber sintered body composited on the back layer 12, the combustion zone 4 is formed by the surface layer 11. For this reason, although the surface layer 11 is at a high temperature, since it is a ceramic fiber sintered body, it has heat resistance and oxidation resistance, and therefore, even if the surface temperature is increased,
That is, it can sufficiently withstand high load combustion. For example,
The surface load is up to 15 kcal / cm ^{2 for} a conventional sintered metal powder plate.
H, whereas in the case of the present invention, a maximum of 80 kcal / cm ²
h. The porosity of the surface layer 11 can be close to that of the back layer 12.

The structure of a burner using the above-described burner plate 1 is shown in FIGS.
It is shown in the figure. In the drawing, reference numeral 10 denotes a burner main body to which the burner plate 1 is attached, and 15 denotes a fuel gas supply device, which supplies a fuel gas from a gas cylinder 16 to a nozzle 17 provided in the burner main body 10. Propane gas is used as fuel gas. 18 is a blower that supplies air,
On the upstream side of the burner main body 10, a premixed gas of the fuel gas and the air ejected from the nozzle 17 is produced. 20 is a spark plug, 21 is a spark plug 20 and a solenoid valve for fuel gas
19 power supplies.

In the burner configured as described above, the premixed gas of the fuel gas and the air is jetted uniformly from the entire surface layer 11 of the burner plate 1. Next, when ignited by the ignition plug 20, the flame propagates to the entire burner plate 1, and the sintering zone 4 is formed on the surface layer 11 made of the ceramic fiber sintered body, and starts burning.

Note that the heating direction of the burner is free and does not depend on the horizontal direction, the upward direction, the downward direction, or the like. In addition, any fuel may be used as long as it is a flammable gas mixture, and is not limited to 6B and 13A used for home use, or propane, methane, butane, etc., and may be flammable low-calorie waste gas (CO, etc.). No problem. Therefore, the burner plate according to the present invention can be used as a heating means for any application or a waste gas treatment means, and can realize a burner with high radiant heat and high thermal efficiency.

[Effects of the Invention] As described above, according to the present invention, in the surface burning type burner plate, there is provided a composite sintered plate using ceramic fibers for the surface layer of the high-temperature portion and metal fibers for the surface layer of the low-temperature portion. Therefore, the mechanical strength and the porosity of the back layer can be increased, and a burner plate having a large area and a high surface load can be obtained. Furthermore, since the surface layer of the high-temperature portion is a ceramic fiber sintered body, heat resistance and oxidation resistance are improved, and high load combustion is possible in combination with the increase in mechanical strength and porosity of the back layer. , Durability is also improved. Further, the ceramic sintered plate has a great effect such as showing a high emissivity at a high temperature as compared with a metal sintered plate.

[Brief description of the drawings]

1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a front view of a burner using a burner plate of the present invention, FIG. 3 is a side view of the same, and FIG. FIG. 5 is an enlarged schematic diagram showing a temperature distribution curve in a cross section of a conventional burner main body. DESCRIPTION OF SYMBOLS 1 ... Burner plate 2 ... Long metal fiber 3 ... Void 4 ... Combustion zone 11 ... Surface layer (ceramic fiber sintered body) 12 ... Back layer (metal fiber sintered body)

Claims (1)

(57) [Claims] 1. A burner plate, wherein a surface layer on the downstream side of the fuel gas and a back layer on the upstream side are each a composite sintered plate of a ceramic fiber sintered body and a metal fiber sintered body.