JPS59134402A - Burner apparatus - Google Patents

Abstract

PURPOSE:To reduce and decompose NOX produced in primary combustion by a structure wherein flame is divided into primary and secondary combustions and secondary flame holes arranged at a primary combustion chamber are made of a ceramic plate or the like, on which ABO3 compound oxide is carried. CONSTITUTION:Because the division of Bunsen flame into primary combustion and secondary combustion causes flame temperature drop, the reduction of NOX value is also resulted. In addition, secondary flame holes 7 arranged at a primary combustion chamber 9 are provided so that they are made of ceramic plate or the like, on which ABO3 compound oxide (perovskite-type structure) is carried, wherein A represents La or Sr and B represents Co, Fe, Mn or the like. Because primary combustion is proceeded in the primary combustion chamber 9 with the air ratio, which is below theoretical amount of air and above inflammability limit, no partial pressure of oxygen can be said to exist at all in the primary combustion flame or in the combustion gas within the primary combustion chamber 9 and at the same time dense atmosphere of reducing gas such as CO and the like is produced. Accordingly, NOX produced in primary combustion is reduced and decomposed when the combustion gas spent in primary combustion passes through the secondary flame holes 7.

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.

Structure of claim 19 and its problems Many of the conventional household combustion appliances used Bunsen burners, which resulted in high NOx values, and there was a demand for lower NOx.

Low NOx burners such as atmospheric-pressure full-scale 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 is easily deteriorated by air currents). Therefore, its use was limited to stoves, etc.

On the other hand, Japanese Patent Application No. 55-74810, Utility Model Application No. 57-879
As disclosed in No. 24, a burner has been proposed in which the combustion flame of a Bunsen burner is divided into a primary combustion flame and a secondary combustion flame to reduce NOx, and this has been quite effective.
There is a demand for further reduction in NOx.

Purpose of the Invention The present invention is based on the aforementioned Japanese Patent Application No. 55-74810 and Utility Model Application No. 57
- The burner device disclosed in No. 87924 has an even lower NO.
This is an attempt to make the world a better place.

Structure of the Invention The present invention aims at low N0x (tl) by lowering the flame temperature by dividing the combustion flame of a Bunsen burner into primary combustion and secondary combustion by providing a primary combustion chamber.
The two flame ports installed in the next combustion chamber are A, La, and Sr.
, BijCOp Fe, and a catalyst body supporting a Mn-based composite oxide (perovskite structure), and by providing it in contact with the primary calcining flame or the combustion gas after the primary combustion, Decomposes and reduces NOx generated by primary combustion in the primary combustion chamber, further reducing NOx.
The aim is to

Embodiment FIG. 1 is a perspective view showing an example of the present invention, FIG. 2 is a cross-sectional view of the same, and FIG. 3 is a diagram showing NOx4 according to the primary air ratio.
? A traditional bunsen burner and a two-stage bunsen burner.
Shows the characteristics compared to the burned value.

Hereinafter, one example of the present invention will be explained based on FIGS. 1 to 3.

The gaseous fuel is ejected from a nozzle 1, enters the mixer pipe 3 of the burner 2, and the jet sucks atmospheric air from the surroundings as primary air. At this time, the diameter of the mixed @ pipe inlet 3 is adjusted using a damper or the like so that the amount of primary air is above the flammability limit and below the theoretical air amount. The gaseous fuel and air are mixed into a flammable gas in the mixing tube 4, and a primary combustion flame 6 is formed on a plurality of flames 6.

2 Flame lower, A11j: La, Sr % B Co,
A B 03 composite oxide consisting of Fe and Mn systems (
They are made of ceramic plates or the like that support a perovskite structure (perovskite structure), and a plurality of them are provided. Surrounding air is supplied to the secondary flame lower as secondary air, and a secondary combustion flame 8 is formed above the secondary flame opening. In this way, the container forming the primary combustion chamber 9 having the two flame lowers is provided so as to cover the primary flame port 5.

In the above configuration, the air-fuel mixture in the mixing tube 4 is less than the theoretical air amount and more than the flammable limit, so it is in an air-deficient state, and in this state it flows into the primary flame port 6 and forms the primary combustion flame 6. The lack of air cannot be recovered because the primary flame opening 6 is covered by the primary combustion chamber 9, and the unburnt gas finally reaches the 2nd flame on the 2nd flame lower.
Secondary air is supplied to form a secondary combustion flame 8 on the two-flame lower, and combustion is completed. In this way, the flames are primary combustion flames 6 and 2.
The secondary combustion flame 8 is separated, and a stable flame is formed on the primary flame port 5 and 2 flame lower. Therefore, by dividing the Bunsen flame into primary combustion with less than the theoretical amount of air and secondary combustion with secondary air, the flame temperature will be lower than that of a conventional Bunsen burner, and the NOx value will also vary accordingly. It will be lowered.

Furthermore, the two flames]217 provided in the primary combustion chamber 9 are
Aij La, Sr%B[Go, Fe,
A Mn-based N1Bo3fyi composite oxide (perovskite structure) is supported on a ceramic plate or the like.

It has been confirmed (i7rt) that ABO3g oxide can decompose Noxi N2 and 02VC in a reducing atmosphere with almost no oxygen partial pressure. Since primary combustion is taking place, it can be said that there is no oxygen partial pressure at all in the primary combustion flame or in the combustion gas in the primary combustion chamber 9, and reducing gas such as GO Because of this, when the combustion gas that underwent the primary combustion passes through the two-flame lower, it becomes possible to reduce and decompose the NOx generated in the primary combustion.

Furthermore, since the two-flame lower FiABO3 composite oxide is formed with a ceramic plate, etc., the heat exchanger is large, which makes it possible to lower the temperature of primary combustion and secondary combustion.
This makes it possible to further reduce NOx.

Curves A, B, and cfq in Figure 3 show the NOx percentage of the conventional Bunsen burner, the two-stage combustion in which the flame of the Bunsen burner is divided, and the burner device of the present invention, respectively. Divide the combustion flame into two
In a burner device that performs staged combustion to achieve low NOx emissions, a secondary flame consisting of a ceramic grate supporting A B O3 composite oxide gold installed in the primary combustion chamber passes through a secondary flame nozzle.
Since the secondary combustion gas is a strong reducing atmosphere, NOx decomposition I
Enables complete reduction, and has lower NO compared to conventional burner devices that split the flame and metal of Zeno burner and Bunozeno burner.
This shows that it is possible to achieve

According to the burner device of this embodiment, the maximum flame temperature and the average temperature of the flame (1-HHg-
, and the generation of NOx can be suppressed due to the reduction in 02 concentration during primary combustion. Furthermore, by providing a secondary flame nozzle made of a ceramic plate supporting ABO, composite oxide, etc. in the primary combustion chamber, it is possible to further reduce NOx by reducing and decomposing NoX1 generated during the primary combustion process. became possible.

In addition, r, x, and primary combustion in the primary combustion chamber are 1 in non-example.
I mentioned the example of using secondary air, but even if you put auxiliary air other than primary air into the primary combustion chamber and reduce the primary air by that amount, it will be almost the same if the amount of air supplied to tertiary combustion is the same. The following effects can be obtained.

Effects of the Invention As explained above, according to the burner device of the present invention, the flame of the Bunsen burner is divided into primary combustion and secondary combustion, and the two flame ports provided in the primary combustion chamber are ABO3 composite flames. By forming it with a ceramic grate or the like that supports oxides, it is possible to reduce NOx (H) produced in the primary combustion, making it possible to reduce NOx.

Furthermore, by using a Bunsen burner to reduce NOx, it has become possible to provide a burner device suitable for household combustion appliances that is low in cost and has a wide combustion range.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the burner device of the present invention;
FIG. 2 is a sectional view thereof, and FIG. 3 is a NOx characteristic diagram. 6...1 flame port, 7...2 flame port, 9
...Primary combustion chamber. Name of agent: Patent attorney Toshio Nakao and 1 other person
3 diagram

Claims (1)

[Claims] A primary combustion chamber covering one flame port having a plurality of flame nozzles is provided, a burner having two flame nozzles is formed in the primary combustion chamber, and the two flame nozzles A are La, Sr,
B is A B O3 consisting of Go, Fe, Mn system
A burner device configured with multiple flame ports supporting a perovskite structure, which is a complex oxide.