JPS6238104Y2 - - Google Patents

Description

[Detailed Description of the Invention] An object of the present invention is to provide a burner device as a household combustion device that can reduce nitrogen oxides at low cost and with a simple structure.

Conventionally, industrial methods for reducing nitrogen oxides include two-stage combustion, exhaust gas recirculation, addition of steam and water, etc., but the existing techniques described above tend to require large-scale equipment. Due to these circumstances, it is not easy to develop combustion equipment for household use, and even the stubble burners currently used for household use, which generate low nitrogen oxides, have the problem of being expensive. Further, a combustion type that includes a combustion chamber includes the sumicel burner shown in FIG. 6, but it is only used in laboratories and has not been developed into household appliances.

The present invention solves the above conventional drawbacks by attaching a container with a single secondary flame hole and tertiary flame hole to a conventionally used burner. The purpose of the present invention is to provide a burner device that is capable of reducing.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 and 2. Gaseous fuel is ejected from the noise 1 and enters the mixing pipe inlet 3 of the burner 2, and its jet sucks atmospheric air from the surroundings as primary air. At this time, the primary air amount is adjusted by using a damper or the like to adjust the diameter of the mixing tube inlet 3 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 a plurality of
A flame is formed on the next flame hole 5. A container 8 forming a primary combustion chamber 7 having a single hole and a rectangular secondary flame hole 6 has a primary flame hole 5 and a rectangular secondary flame hole 6. Cover to prevent it from entering. A secondary flame is formed on the secondary flame hole 6. Further, a secondary combustion chamber 10 having a single hole and a rectangular tertiary flame hole 9 is formed, and the combustion chamber 1
The burner device of the present invention is constructed by covering the secondary flame hole 6 with a container 12 provided with a plurality of secondary air holes 11 on the side surface of the burner.

In the above configuration, the potential 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 gas finally comes into contact with the secondary air on the secondary flame hole, where it forms the secondary flame hole. become. However, since sufficient secondary air is not provided,
The gas was not completely combusted on the secondary flame hole, and the remaining gas was 3
Combustion is completed on the next flame hole.

As a result, the maximum temperature and average temperature of the flame produced by the burner device of the present invention are lower than the flame temperature produced by the conventional burner device, and due to this decrease in flame temperature and the decrease in O ₂ concentration at the maximum temperature, nitrogen Generation of oxides can be suppressed.

FIG. 5 is a comparison between the conventional burner and the burner device of the present invention, with the vertical axis representing the nitrogen oxide concentration and the horizontal axis representing the input. As is clear from this, the burner device of the present invention can reduce the generation of nitrogen oxides to 30 to 35% compared to the conventional burner.

Next, another embodiment of the present invention will be described with reference to FIGS. 3 and 4.

In Figures 3 and 4, the shapes of the primary combustion chamber and the secondary combustion chamber are formed by a container configured such that both longitudinal sides thereof are sandwiched in the vertical upward direction.
It is constructed by covering the secondary flame hole and the secondary flame hole.

As in this embodiment, by tapering the shapes of the primary combustion chamber and the secondary combustion chamber, the resulting gas ejection velocity and the combustion product gas velocity can be increased.
It is possible to prevent secondary air from flowing into the secondary combustion chamber. As a result, the increase in flame temperature is suppressed, and the effect of stabilizing the flame can be obtained. Here, we have shown an example up to the secondary combustion chamber, but there are also three
Next, nitrogen oxides can be further reduced by providing a quaternary combustion chamber.

As described above, according to the present invention, the following effects can be obtained.

(1) The primary flame hole and primary combustion chamber are separated into one-stage combustion and two-stage combustion by preventing air from entering from the outside, and in addition to this, a rectangular shape is installed on the top surface to enable three-stage combustion. Each vessel with a single tertiary flame hole,
Since it is connected to the burner, it is possible to suppress the temperature rise of the combustion flame at each stage, reducing NO _x and stabilizing the flame.

(2) Since the secondary and tertiary flame holes have a single rectangular shape, even when heated by the combustion flame in the previous stage, compared to multiple flame holes, the strength of the flame hole edges is greater, resulting in greater durability. be.

(3) Since the structure is simple, it can easily be used with appliances in which multiple burners are installed in parallel.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a burner device showing one embodiment of the present invention, Fig. 2 is a sectional view of the same burner device, Fig. 3 is a perspective view showing another embodiment of the present invention, and Fig. 4 is a perspective view of the burner device. Figure 3 is a cross-sectional view of the embodiment, Figure 5 is a characteristic diagram comparing the effect of suppressing the generation of nitrogen oxides between the burner device of the present invention and a conventional burner device, and Figure 6 is a diagram showing a burner equipped with a conventional combustion chamber. FIG. 1... Nozzle, 2... Burner body, 3... Mixing tube inlet, 4... Mixing tube, 5... Primary flame hole, 6...
...Secondary flame hole, 7...Primary combustion chamber, 8...Container, 9
...Third flame hole, 10...Secondary combustion chamber, 11...2
Next air hole, 12...container.

Claims (1)

[Scope of utility model registration request] A premix combustion burner having a primary flame hole consisting of a plurality of flame holes, and a container having a primary combustion chamber formed downstream of the primary flame hole and having a single rectangular secondary flame hole on the upper surface. and a container having a secondary combustion chamber formed downstream of the secondary flame hole, a single rectangular tertiary flame hole on the upper surface, and a plurality of secondary air holes on the lower side or lower surface. , and the container having the secondary flame hole has a second flame hole connected to the primary flame hole and the primary combustion chamber from the outside.
A burner device in which the container having the tertiary flame hole surrounds the primary flame hole to prevent secondary air from flowing in, and the container having the tertiary flame hole surrounds the secondary flame hole.