JPH0241495Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a gas catalytic combustor equipped with a hot air duct.

(Prior Art) Conventionally, a gas catalytic combustor is known in which an electric heater is embedded in a planar catalytic main burner and the main burner is preheated by the electric heater.

(Problems to be Solved by the Invention) In the conventional gas catalytic combustor, the electric heater must be buried as described above.
This has the problem that the manufacturing cost is relatively high, and since electric energy is also required, the operating cost is also relatively high.

An ignition method using a pilot burner is also known, but since the heating of the combustion surface by the flame of a conventional pilot burner is localized, unburned gas is released to the outside until the entire combustion surface is combusted. I had something to do.

(Purpose of the invention) In view of the above-mentioned conventional problems, the present invention attempts to provide a gas catalytic combustor that is provided with a gas catalytic combustor that is relatively expensive to manufacture and operate.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention includes a planar catalytic main burner 1, a planar catalytic main burner 1 extending along the combustion surface of the catalytic main burner 1, and an opening on the combustion surface side. The hot air duct 4 is characterized by comprising a hot air duct 4 and a pilot burner 3 having an ignition hole 3a inside the hot air duct 4.

(Function) According to the present invention, the combustion of the pilot burner heats the air in the hot air duct, and the heated air flows along the combustion surface of the catalytic main burner through the hot air duct, and the heated air flows along the combustion surface of the catalytic main burner. Preheat extensively.

(Embodiment) Figures 1 to 4 show an embodiment of the present invention, in which 1 is a planar catalytic main burner surrounded by a frame 2 and formed into a rectangular shape; 3 is the main burner; a pilot burner for preheating and igniting 1;
Reference numeral 4 denotes a hot air duct for feeding heated air from the pilot burner 3 to the main burner 1 side.

As shown in FIG. 3, the main burner 1 includes an outer plate 1a, a rectifying plate 1b located in front of the outer plate 1a with a predetermined gap and having a rectifying hole 1b-1, and a front surface of the rectifying plate 1b. Glass wool 1c attached to
, a ceramic fiber 1d having air permeability attached to the front surface of the glass wool 1c, a catalyst mat 1e having heat resistance and air permeability attached to the front surface of the ceramic fiber 1d, and a catalyst mat 1e attached to the front surface of the catalyst mat 1e. A gas discharge pipe 5 connected to an ignition valve (not shown) is interposed in the gap, and a gas discharge hole 5a of the gas discharge pipe 5 is provided facing the outer plate 1b. . The catalyst mat 1e supports platinum, palladium, etc., and emits infrared rays during combustion. Further, on both sides of the lower part of the back side of the main burner 1, there are support legs 7 erected on the pedestal 6.
is supported by

The pilot burner 3 is connected to the ignition valve, and its lower part is fixed to a mount 8 having a U-shaped cross section attached to the upper surface of the pedestal 6, and its ignition hole 3a is located in front of the front of the lower part of the main burner 1. It is located in

The hot air duct 4 is formed to have a substantially inverted U-shaped cross section along the lateral direction of the main burner 1, and
It is provided at the lower front of the front surface (combustion surface) of the main burner 1. Further, a holding plate 4a is provided at the lower end of the hot air duct 4 so as to protrude toward the main burner 1 side, and the holding plate 4a holds the upper part of the pilot burner 3. The ignition hole 3a of the pilot burner 3 is inserted into the ignition hole 3a of the pilot burner 3. Further, an opening (opening 4b) is formed downward from approximately the center in the vertical direction on the main burner 1 side, and the opening 4b is opposed to the combustion surface of the main burner 1.

9 is the pilot burner 3 which is fixed to the mounting base 8 and whose tip end is inserted into the hot air duct 4.
This is the ignition rod.

According to this embodiment, first, the ignition valve is opened, and gas fuel is supplied to the main burner 1 and the pilot burner 3. As a result, on the main burner 1 side, gas fuel is discharged from the gas discharge hole 5a of the gas discharge pipe 5, and further, the gas fuel is discharged from the gas discharge hole 5a of the gas discharge pipe 5. It is evenly discharged from the front surface of the main burner 1 via the mat 1e and the protective wire mesh 1f. On the other hand,
Gaseous fuel is discharged from the ignition hole 3a of the pilot burner 3 and ignited by the ignition rod 9. Furthermore, by igniting the pilot burner 3,
The air near the ignition hole 3a is heated, and the heated air passes through the hot air duct 4 to the main burner 1.
is supplied to the combustion surface of the main burner 1 to preheat and ignite the main burner 1.

At this time, the hot air duct 4 is connected to the main burner 1.
Since it is provided horizontally in front of the lower part of the combustion surface of the main burner 1 and opens downward from approximately the center on the side of the main burner 1, the heated air is supplied to the entire lower part of the main burner 1. Preheating and ignition time are short.

In addition, the plate shape on the combustion surface side of the hot air duct 4 is formed so that the pilot burner corresponding portion 4c is wide and the width becomes narrower as the distance from the corresponding portion 4c in the length direction increases. The temperature distribution on the combustion surface facing the combustion surface also becomes uniform.

Further, since the ignition hole 3a of the pilot burner 3 is inserted into the hot air duct 4, the flame A of the pilot burner 3 is covered by the hot air duct 4, and the flame A is extinguished by the outside wind. Never.

(Effects of the invention) As explained above, the present invention includes a planar catalytic main burner, a hot air duct that extends along the combustion surface of the catalytic main burner and is open on the combustion surface side, and Since the main burner is equipped with a pilot burner having an ignition hole in the wind duct, it has the advantage that the combustion surface can be preheated over a wide range and the entire main burner can be ignited in a short time. Furthermore, since the ignition hole is inserted into the hot air duct, the flame of the pilot burner is covered by the hot air duct, which has the advantage of preventing the flame from being extinguished by outside air. Further, since it is not necessary to embed an electric heater in the entire main burner as in the conventional case, there is an advantage that a gas catalytic combustor with low manufacturing cost and low operating cost can be provided.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, in which FIG. 1 is a front view showing a gas catalytic combustor, FIG. 3
The figure is a partially omitted enlarged longitudinal sectional view showing the internal structure of the main burner, and FIG. 4 is an enlarged sectional perspective view showing the main parts of the present invention. In the figure, 1...catalytic main burner, 3...pilot burner, 3a...ignition hole, 4...hot air duct.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A planar catalytic main burner, a hot air duct extending along the combustion surface of the catalytic main burner and opening on the combustion surface side, and an interior of the hot air duct. A gas catalytic combustor comprising: a pilot burner having an ignition hole; and a pilot burner having an ignition hole. (2) Utility model registration claim 1, characterized in that the plate shape on the combustion surface side of the hot air duct is formed so that the portion corresponding to the pilot burner is wide and the width becomes narrower as the distance from the corresponding portion in the length direction increases. Gas catalytic combustor as described in section.