JPS6040763B2 - Burner device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to provide a burner device as a household combustion appliance that can reduce nitrogen oxides with an inexpensive and compact configuration.

Conventional methods for reducing nitrogen oxides that have been carried out industrially include two-stage combustion, exhaust gas recirculation, and the addition of steam and water, but the existing technologies mentioned above tend to require large-scale equipment. .

Furthermore, these technologies are often used individually or in combination. Due to these circumstances, it is not easy to apply this method to household combustion equipment, and even the Schwank burners that are currently used for household use and which generate low levels of nitrogen oxides have the problem of being expensive. In addition, a smicer burner is an example of a combustion type that includes a combustion chamber, but it is only used in laboratories and has not been applied to household appliances. The present invention solves the above-mentioned conventional drawbacks by attaching a container having a single secondary flame hole to a conventionally used burner, and reduces nitrogen oxides with an inexpensive and compact structure. The present invention provides a possible burner device. Hereinafter, the first to second embodiments of the present invention will be described.
This will be explained based on the diagram.

1, 1 is a nozzle that spouts gaseous fuel, and the gaseous fuel spouted from here enters into the burner 2, 2 from its mixing pipe inlet 3, 3, and the jet sucks atmospheric air from the surroundings as primary air. do.

At this time, the primary air amount is adjusted by using a damper or the like to adjust the diameter of the inlet portion 3 of the merging pipe so that the excess air ratio m is 0.6 to 0.9. The gaseous fuel and air are mixed in the mixing tube 4 to become a flammable gas and form a flame on the plurality of primary flame holes 5. A container 6 is provided to cover the primary flame holes 6, 5 of the burners 1, 1 or the entire burners 4, 4, and has a primary combustion chamber 7 formed therein and a single secondary flame hole 8.

Figure 3 shows the value obtained by dividing the gaseous fuel supply amount by the total area of the secondary flame hole,
In other words, the secondary flame hole load and the CO2 in the combustion exhaust gas
It shows the relationship between the concentration of nitrogen oxides and the concentration of nitrogen oxides N○x.

When the secondary flame load exceeds 1.7 Kcal/2 h of sail, the values of nitrogen oxides and CO/CO2 begin to rise.

For these reasons, the secondary flame hole load is 1.7 Kcal/2 ribs.
A single primary flame hole 8 is constructed so as to have the same shape as h'. The burner device of the present invention is constructed by covering the primary flame hole 5 or the entire burner 4 with the container 6 having the secondary flame hole set in this way and forming the primary combustion chamber 7. In the above configuration, the combustible competitive gas in the mixing tube is in an air-deficient atmosphere, and in this state flows into the primary flame hole to form a primary flame. The lack of air cannot be recovered because the primary flame hole is covered by the primary combustion chamber, and the unburned gas finally comes into contact with the secondary air on the secondary flame hole, where it forms a secondary flame. . In this way, the flame is separated into a primary flame and a secondary flame, and a stable flame is maintained above both flame holes. As a result, the maximum temperature and average temperature of the flame produced by the burner device of the present invention are as follows:
The flame temperature is lower than that produced by conventional burner equipment,
Due to this lower flame temperature and lower oxygen concentration at the highest temperature, the generation of nitrogen oxides can be suppressed.

In addition, when covering a plurality of burners with a container having a secondary flame hole, the secondary flame hole may be provided in a single configuration or in a plurality of configurations, as described above. In the latter case, the area between the secondary flame holes is heated by the primary flame and tends to become red hot. Furthermore, when a single burner is used for combustion, a secondary flame hole is created in which no secondary flame is formed, and secondary air flows into the primary combustion chamber through this flame hole, disturbing the second-stage combustion. In the present invention, since the secondary flame hole is a single flame hole, there is no such inconvenience. FIG. 4 compares the relationship between the combined amount of gaseous fuel supplied and the concentration of nitrogen oxides in the exhaust gas between the burner device A of the present invention constructed as described above and the subordinate burner device 8'. .

As is clear from this, the burner device of the present invention can reduce the generation of nitrogen oxides to 25 to 30% compared to the conventional burner. As described above, according to the burner device of the present invention,
By covering the multiple flame holes of multiple burners or the entire burner with a container that forms the primary combustion chamber, and providing a single secondary flame hole in this container, the configuration is simplified and the flame temperature is lowered. , it is possible to reduce nitrogen oxides.

[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 cross-sectional view of the same, Fig. 3 is a diagram showing the relationship between secondary flame hole load and combustion characteristics, and Fig. 4 is a characteristic showing the nitrogen oxide generation status of the burner device of the present invention and the conventional burner device. It is a diagram. 1... Nozzle, 2... Burner, 3...
Mixing pipe inlet, 4...Mixing pipe, 5...Primary flame hole, 6...Container, 7...Primary combustion chamber, 8...2 Next flame hole. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A plurality of burners are provided that eject fuel gas from a nozzle to the inlet of a burner mixing pipe, and suck in the surrounding atmosphere as primary air through the jet, and a plurality of primary flame holes or A burner device characterized in that the entire burner is covered by a container forming a primary combustion chamber, and the container is provided with a single secondary flame hole. 2 The secondary flame hole has a flame hole load of 1.7 Kcal/mm^
The burner device according to claim 1, which is set to 2 hours or less.