JPS582327B2 - infrared gas burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Conventional infrared gas burners having an infrared radiation surface include ceramic burners in which a large number of circular holes are provided in a refractory plate made of acetic acid as a product; Burners that heated refractories to high temperatures, such as wire mesh burners and punsen burners, were used.

The ceramic burner has low mechanical strength, takes time to become red hot, and has low infrared generation efficiency.

This is because the heat conduction of the ceramic itself is poor, so the temperature around the hole is relatively high, but the temperature is lower in areas away from the hole, and the amount of radiation is small.

However, there is no corrosion at all under high temperatures, and this can be said to be a major feature of Ceramisokuvarna.

On the other hand, although wire mesh burners have good heat conductivity, they cannot raise the temperature due to high-temperature corrosion and cannot reduce the amount of radiation.

Furthermore, even the method of heating refractories using the Bunsen burner method had the disadvantage that uniform red heat could not be obtained and the amount of radiation was the lowest among these burners.

The present invention relates to an infrared gas burner that eliminates these conventional deficiencies.

An embodiment of the present invention will be described below based on the drawings.

In Figures 1 and 2, 1 mixes and disperses oxides, grains, fibers, etc. of heat-resistant metal materials in the contents of refractory materials such as ceramics,
The combustion section is configured in a flat plate shape with a large number of gas ejection holes 1', 2 is its fixed frame, 3 and 4 are a mixing tube and air suction port that constitute the gas supply section, and a nozzle 5 that communicates with the gas main valve is used. The ejector action of the ejected combustible gas draws air through the air suction port 4 and mixes it with air in the mixing pipe 3 to form a mixed gas.

This mixed gas reaches the inside of the combustion section 1, ejects from the nozzle 1', and is ignited at the same time. From this, the surface temperature of the combustion section 1 rises, reaching a high temperature of 900 to 1000 degrees Celsius, becoming red-hot and emitting strong infrared rays. radiate.

It goes without saying that this type of infrared gas burner must be designed to emit the maximum amount of infrared rays suitable for heating, and the wavelength of the infrared rays in this case is approximately 2.5μ as shown in Figure 3. is the most common.

Figure 3 shows the spectral transmittance when the thickness of the water layer is changed and when the water layer is thin. Generally speaking, water absorbs infrared rays well, so if it contains water, its spectral characteristics will be similar to that of water. It exhibits spectral properties similar to those of water.

As is clear from this Figure 3, in both cases 0.4
This shows that the transmittance is large in the band of about 2.5 μm, that is, the absorption is poor.

As mentioned above, it is desirable to use an infrared burner that has as much absorption as possible (that is, the transmittance is as low as possible), that is, it emits the most infrared rays suitable for heating, and from this point of view, the energy radiated from the infrared burner can be absorbed efficiently. It can be said that a wavelength of about 2.5 μm is most suitable for conversion into heat.

Now, if we calculate the relationship between the wavelength and the burner radiator temperature using Wien's displacement law, we can plot the wavelength on the horizontal axis and the radiator temperature on the vertical axis, and the curve as shown in Figure 4 will be obtained, indicating the radiation suitable for heating. It can be seen that in order to obtain an energy wavelength of approximately 2.5μ, the radiator temperature should be approximately 900°C.

However, such a high-temperature radiator has not been previously available.

With the aforementioned ceramic burners and Bunsen burners, which heat refractories at high temperatures, the temperature is at most about 800°C, and with wire mesh burners, it is not possible to raise the temperature above 840°C because of high-temperature oxidation corrosion of the metal and backfire phenomenon. .

The infrared rays of the present invention can improve the high-temperature corrosion of wire mesh burners, the mechanical strength of ceramic burners, the Bunsen method, thermal conductivity,
This eliminates all problems such as uneven red heat.

In other words, by mixing and dispersing oxides, grains, fibers, etc. of heat-resistant metal materials inside the refractory, heat conduction becomes smooth and there is no temperature distribution between the nozzles or at a distance from the nozzles, making the temperature uniform. .

In addition, because the metal material is dispersed in age, the temperature rises quickly, and while the surface temperature of conventional ceramic burners was around 800°C, the burner of the present invention has a sufficient temperature range of 900 to 950°C. .

In terms of mechanical strength, mechanical impact resistance and thermal impact resistance can also be improved by mixing and dispersing metal fibers.

The burner of the present invention was prototyped and its characteristics were compared as shown in the following table.

As described above, the material of the present invention is dispersed and mixed inside the refractory material beforehand at the time of molding, and unlike the adhesion type, there is no possibility of peeling or falling due to repeated heating and cooling. Moreover, it is not exposed to flames that undergo extremely severe oxidation and reduction under the conditions of use, and its durability as a burner plate is significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an infrared gas burner showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the combustion section, Fig. 3 is a curve diagram showing the relationship between infrared wavelength and transmittance, and Fig. 4 is an infrared gas burner. It is a curve diagram showing the relationship between wavelength and radiator temperature. 1... Combustion part, 1'... Gas injection hole.

Claims (1)

[Claims] 1. An infrared gas burner characterized in that oxides, grains, or fibers of a heat-resistant metal material are mixed and dispersed inside a refractory, and a combustion section is formed by providing a large number of gas ejection holes.