JPS582328B2 - Sekigaisen gas burner - Google Patents

Description

[Detailed description of the invention] The present invention relates to an infrared gas burner.

Conventional infrared gas burners with an infrared radiation surface include ceramic burners that have a large number of circular holes in a refractory plate whose main component is aoto, wire mesh burners that use each hole in the wire mesh as a hole, and Bunsen burners that are fireproof. Burners were used to heat things to high temperatures.

Ceramic burners have weak mechanical strength, take a long time to become red hot, and have low infrared generation efficiency.

This is because the ceramic itself has poor thermal conductivity, so the temperature around the hole is relatively high, but the temperature is low in areas away from the hole, and the amount of radiation is small.

Although wire mesh burners have good thermal conductivity, they cannot raise the temperature too much due to high-temperature corrosion, making it impossible to increase the amount of radiation.

It also corroded easily and had a short lifespan.

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

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 is a molded wire mesh 1b braided using a heat-resistant metal wire material on the edge of a refractory material 1a such as ceramic, and a gas ejection hole 1' is provided in each mesh of the wire mesh 1b. A burner constructed in the form of a flat plate, 2 its fixed frame, 3, 4
is a mixing pipe and an air suction port that constitute a gas supply section, which sucks air from the air suction port 4 through the ejector action of the combustible gas ejected from the nozzle 5 that communicates with the gas main valve;
It is mixed with air in the mixing tube 3 to form a mixed gas.

This mixed gas reaches the inside of the burner 1, and the gas nozzle 1'
When the burner 1 ejects and ignites at the same time, the surface temperature of the burner 1 rises to 900 to 1000°C, becoming red hot and emitting strong infrared rays.

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 most suitable wavelength for that infrared ray is around 2.5μ, as shown in Figure 3. ing.

This figure 3 shows the spectral transmittance when the thickness of the water layer is changed and when the water layer is changed.Since water absorbs infrared rays well, the spectral characteristics of things containing water are significantly different from those of water. It exhibits permeation properties similar to those of water itself.

Although the transmittance varies slightly depending on the wavelength band, as is clear from this figure, the transmittance is 0.4 to 2.5 μm in all cases.
This shows that the transmittance is large in the band.

The higher the transmittance, the worse the absorption.

From this, the most suitable wavelength of infrared rays for the energy radiated from the infrared burner to be efficiently absorbed and converted into heat is about 2.5 μm.
It can be said that the temperature of the infrared burner should be set so as to obtain a wavelength of about 5 μm.

Now, if we try to find the relationship between the wavelength and the temperature of the bar radiator using Wien's displacement law, if we plot the wavelength on the horizontal axis and the radiator temperature on the vertical axis, we will get a curve as shown in Figure 4, which is suitable for heating. It can be seen that in order to obtain a wavelength of radiant energy of approximately 2.5μ, the temperature of the radiator should be approximately 900°C.

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

In the ceramic burner and Bunsen burner described above, which heat refractories at high temperatures, the temperature is at most 800°C, and in the wire mesh burner, the temperature cannot be raised above 8406°C because it tends to cause high-temperature oxidation corrosion of the metal and backfire phenomenon.

On the other hand, the burner 1 of the present invention solves these drawbacks. Specifically, a wire mesh 1b braided with heat-resistant metal wire material is molded inside the refractory 1a, particularly near the surface of the burner 1, and Each combustion plate is provided with a gas ejection hole 1' passing through the front and back sides of the combustion plate to form a combustion section.

By molding the wire mesh material, heat conduction is improved and differences in temperature distribution between gas ejection holes are eliminated.

Therefore, the temperature on the surface of the combustion part becomes uniform.

Also, the mechanical properties (impact resistance), which are a drawback of fireproof plates such as ceramics, are improved by molding the wire mesh.

Traditionally, with ceramic burners, the burner surface temperature was at most 80°C.
The temperature rose only to about 0℃, but with the burner of the present invention, the temperature rose to 930℃ in the high part by molding the wire mesh.
The temperature can be raised up to 950°C, and the rate of temperature rise is fast.

As a result of making a prototype of the burner of the present invention and measuring its temperature distribution, infrared generation efficiency, etc., the burner surface temperature was approximately 930 to 950.
The temperature distribution between the °C gas nozzles was also about 5 to 10 °C.

Also, in terms of infrared ray generation efficiency, this is approximately 20% more efficient than conventional ceramic infrared burners.

As described above, the burner of the present invention has excellent characteristics, eliminates the drawbacks of conventional products, and has extremely high industrial value.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an infrared burner showing an embodiment of the present invention, Fig. 2 is a plan view of the main part, Fig. 3 is a curve diagram showing the relationship between infrared wavelength and its transmittance, and Fig. 4 is infrared wavelength It is a curve diagram showing the relationship between and radiant temperature change. 1a...Refractory, 1b...Wire mesh, 1'
・・・・・・Gas vent.

Claims (1)

[Claims] 1 A combustion plate is formed by molding a wire mesh braided using a heat-resistant metal wire material with a refractory material, and each mesh of the wire mesh is formed with a gas ejection hole that penetrates the front and back of the combustion plate. gas burner.