JPS59173619A - Burner device - Google Patents

Abstract

PURPOSE:To contrive the lowering of NOx by a method wherein a catalytic substance body supporting a perovskite structural body which is an ABO3 complex oxide composed of substance A made from La, Sr family, and substance B made from Co, Fe, Mn family, is provided in a burning flame. CONSTITUTION:A catalytic substance body 10 is arranged with a catalytic substance supporting member 11 at the portion where the maximum temperature is formed in the vicinity of the end part of a secondary burning flame 9, the catalytic substance body is formed by supporting a perovskite structural body with a latch net, coil-shaped and the like heat resistant member, the perovskite structural body is formed of an ABO3 complex oxide composed of substance A made from La, Sr family, substance B made from Co, Fe, Mn family. By such a structure, the maximum temperature of the flame can be lowered caused by maintaining a uniform temperature distribution of the flame, further, the burning flame temperature is lowered by the transferring of temperature from the flame to the catalytic substance body 10, accordingly, the maximum temperature of the flame is further lowered, the quantity of generating NOx can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to the field of low NOx combustion suitable for domestic combustors.

Conventional configurations and their problems Many conventional household combustion appliances use Bunsen burners, which have high NOx values, and there has been a demand for lower NOx values.

Atmospheric pressure full-order/<-nature low NOx burners such as Schwank burners have been put into practical use, but they have drawbacks such as high production costs, narrow combustion range (it is difficult to achieve TDR, and combustion tends to deteriorate due to airflow). Because of this, its use was limited to things like stoves.

On the other hand, as shown in Japanese Utility Model Application Publication No. 57-36414, it has been proposed to install a coil-shaped heat-resistant member in the flame of a Bunsen burner to lower the flame temperature and reduce NOx. However, there is a demand for further reduction in NOx.

OBJECTS OF THE INVENTION The present invention aims to further reduce NOx by improving the burner device disclosed in the above-mentioned Japanese Utility Model Publication No. 67-3641.4.

Composition of the Invention The present invention provides an A[LI
L, Sr, and B are provided with a catalyst supporting a perovskite structure, which is a composite oxide consisting of Go, Fe, and Mn systems, to suppress the generation of NOx by lowering the combustion flame temperature, and to NOx generated inside
This is to decompose and reduce NOx when it comes into contact with the fuel, thereby further reducing NOx.

DESCRIPTION OF EMBODIMENTS Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is a side sectional view thereof, and Fig. 3 is a front view of another embodiment in which the shape of the catalyst body is different. .

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 3. Gaseous fuel is ejected from the nozzle /L/1 and enters the mixing pipe 3 of the Bunsen burner 2. At this time, the jet created by the ejected flow of gaseous fuel sucks atmospheric air from the surroundings as primary air. Gaseous fuel and air are mixed in a mixing tube 4,
Combustion flames 7 are formed in a plurality of flame ports 6 through the mixture chamber 5 . The inside of this combustion flame is the primary combustion flame 8 caused by the air-fuel mixture, and the outer periphery is the secondary combustion flame caused by the secondary air.
is formed.

The flame temperature is highest at the tip of the secondary combustion flame 9, and the highest temperature part generates the most NOx in the secondary combustion flame 9.
In the part where the highest temperature is formed near the tip of
Sr, B is Go, FeMn-based A B Os A catalyst support 11 is used to support a catalyst body 10 in which a perovskite structure, which is a composite oxide, is supported on a heat-resistant member such as a lath net or a coil shape.
It is installed by. ” In the above configuration, by providing the catalyst body 10 near the flame maximum temperature part, the temperature distribution of the flame can be made uniform, thereby lowering the flame maximum temperature.Furthermore, heat transfer from the flame to the catalyst body 1o can be made uniform. Since the combustion flame temperature is lowered by this, the maximum flame temperature is further lowered and the amount of NOx produced can be reduced.

Further, the secondary combustion flame 9 is a reducing atmosphere which can be said to have no oxygen partial pressure at all, and the catalyst body 10 is provided in this reducing atmosphere. It has been confirmed that the perovskite structure 10 decomposes NOx into N2 and 02 in a reducing atmosphere, and since the catalyst body 1o is provided in a reducing atmosphere as described above, it decomposes NOx generated in a flame. It is now possible to reduce NOx by reducing 1st decomposition and 2nd layer.

Effects of the Invention As described above, according to the burner device of the present invention, near the highest temperature part of the flame in the secondary combustion flame of the Bunsen burner,
By providing a catalyst supporting a perovskite structure, the maximum flame temperature is reduced by making the flame temperature distribution uniform, and by providing a catalyst in the flame, heat transfer from the flame to the catalyst causes a decrease in flame temperature. It is possible to lower the maximum temperature and reduce the amount of NOx produced.

Furthermore, by providing a catalyst supporting a perovskite structure in the reducing atmosphere in the flame, a part of the NOx generated in the combustion flame is reduced and decomposed into N2 and 02, making it possible to further reduce NOx. It is.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the burner device of the present invention;
FIG. 2 is a side sectional view of FIG. 1, and FIG. 3 is a front view showing a burner device according to another embodiment of the present invention. 2... Bunsen burner, 7... Combustion flame, 9... Secondary combustion flame, 10... Catalyst body.

Claims (2)

[Claims] (1) A burner device having a structure in which a catalyst supporting a perovskite structure, which is an A B Os complex complex consisting of A for La and 5r1B for Go, Fe, and Mn systems, is provided in a combustion flame. (2) The Parr force device according to claim 1, wherein the catalyst body is provided in the secondary combustion flame of the Bunsen burner.