JPS6210617Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention has a breathable catalyst layer inside the burner body facing the opening thereof, and a breathable heat insulating material layer located inside the catalyst layer. The present invention relates to an ignition device for a catalytic combustion burner configured to cause fuel gas that has passed through the heat insulating material layer and the catalyst layer to undergo a combustion reaction by the action of the catalyst layer.

The catalytic combustion type burner having the above configuration requires an ignition means for preheating the temperature of the catalyst bed (catalyst mat) until a catalytic combustion reaction becomes possible. There are two types of systems: ○a. An electric heater is placed inside the catalyst layer, the heat insulating material layer, or the boundary between the two layers. ○b. A pilot burner directly heats the surface of the catalyst layer. However, these had problems in the following points.

In the case of using an electric heater in the former case, a heater with a relatively large electric capacity is required, and the larger the burner, the more problems occur in the power reception capacity, and the start-up is also slow, lasting for about 5 to 10 minutes. Requires ignition time.

In the case of using a pilot burner in the latter case, the catalyst layer is locally overheated due to the orientation of the catalyst burner itself, which adversely affects the life of the catalyst. Further, each burner requires a separate pilot burner.

In view of the above-mentioned circumstances, the present invention has an object to solve the problems of the above-mentioned conventional means.

The characteristic structure of the ignition device for a catalytic combustion burner according to the present invention, which was devised to achieve the above object, is that the ignition device runs along at least one side of the burner body on the opening side, over the entire length or almost the entire length of the burner body. In addition to providing a hot air pressure-feeding duct connected to the hot air generator, over the entire length or almost the entire length of this duct,
The present invention is characterized in that an opening for blowing out hot air is provided along the surface of the catalyst layer.

According to the above-described characteristic structure of the present invention, the hot air that is force-fed and supplied into the pressure-feeding duct and ejected from the jet port along the surface of the catalyst layer is directed from one side of the burner to the opposite side of the catalyst layer. While flowing almost uniformly along the surface, heat is transferred to the catalyst layer,
Since the entire surface of the layer is heated almost evenly and directly, the effect of rapid preheating can be obtained, and as a result, in comparison with the conventional examples described above, regardless of the size of the burner, etc. Since there is no problem with power receiving capacity, it is particularly versatile as an ignition device for large burners.

Regardless of the orientation of the burner itself, local overheating of the catalyst layer and the accompanying reduction in catalyst life can be suppressed, and the durability of the burner as a whole can be improved.

It is possible to shorten the time required for preheating and improve the desired combustion efficiency.

It is easy to adopt a configuration in which a hot air generator serving as an ignition source is shared by a plurality of burners, and it is also economically advantageous.

This resulted in many effects, including:

Embodiments of the present invention will be described in detail below based on the drawings.

As shown in FIGS. 1 and 2, a rectangular box-shaped burner body 1 with its opening facing downward.
A pipe 7 for supplying fuel gas such as manufactured gas, natural gas, LPG, etc. is connected to the center of the bottom of the burner body 1, and a wire mesh 8 is stretched over the downward opening of the burner body 1. Burner body 1
A breathable catalyst layer 2 is provided inside, a breathable heat insulating material layer 3 is provided above the catalyst layer 2, and a perforated plate 9 is provided above the heat insulating material layer 3.
The ignition device for a catalytic combustion burner configured to cause a combustion reaction between the fuel gas that has passed through the porous plate 9, the insulation layer 3, and the catalyst layer 2 and the oxygen in the air by the action of the catalyst layer 2 is as follows. Configure it as follows.

A hot air pressure-feeding duct 5 that also serves as a purge air pressure-feeding duct is provided along the long side of the burner body 1 on the opening side, along the entire length or almost the entire length thereof. Alternatively, an opening 6 for blowing out hot air is provided along almost the entire length of the catalyst layer 2, and
A hot air generation burner 4, which is an example of a hot air generation device, is connected to the duct 5, and a fan 10 for pressure-feeding purge air and hot air is connected to the duct 5 via the burner 4. Only at certain times, the burner 4 and fan 10 are operated to forcefully send hot air to the duct 5, and this hot air is ejected from the jet port 6 toward the surface of the catalyst layer 2 to preheat the catalyst layer 2. Thereafter, the burner 4 is stopped, only the fan 10 is kept in operation, and purge air is pumped into the duct 5 so that it flows along the surface of the catalyst layer 2.

As the catalyst layer 2, an alumina fiber mat supporting an active metal of the platinum group such as platinum or palladium is used.

As the heat insulating material layer 3, for example, silica alumina heat resistant mat or the like is used.

In another embodiment, a plurality of catalytic combustion burners are arranged side by side as shown in FIG. Therefore, the main part of the ignition device can be used for a plurality of catalytic combustion burners, and the entire structure can be made low-cost and simple.

Further, a purge air duct and a hot air pressure feeding duct may be provided separately, and the present invention may be applied to a structure in which the surface of the catalyst layer 2 faces upward.

Furthermore, as the hot air generator 4, an electric dryer can also be used instead of a burner.

Furthermore, the duct 5 may be provided not only along one side of the burner body 1 on the opening side but also along two sides.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view, FIG. 2 is a longitudinal side view, and FIG. 3 is a schematic side view showing another embodiment. DESCRIPTION OF SYMBOLS 1... Burner main body, 2... Catalyst layer, 3... Heat insulating material layer, 4... Hot air generator, 5... Hot air pressure feeding duct, 6... Hot air spout.

Claims (1)

[Claims for Utility Model Registration] A gas-permeable catalyst layer 2 is provided inside the burner body 1 facing the opening thereof, and the catalyst layer 2
A catalytic combustion type in which a breathable heat insulating material layer 3 is provided inside the heat insulating material layer 3, and the fuel gas that has passed through the heat insulating material layer 3 and the catalyst layer 2 is caused to undergo a combustion reaction by the action of the catalyst layer 2. A burner ignition device is provided with a hot air forced-feeding duct 5 connected to a hot air generator 4 along the entire length or almost the entire length of the burner body 1 on at least one side of the opening side, and An ignition device for a catalytic combustion burner characterized in that the duct 5 is provided with an opening 6 that blows out hot air along the surface of the catalyst layer 2 over the entire length or almost the entire length of the duct 5. The burner main body 1 is installed and used with its opening facing downward, and the hot air pressure-feeding duct 5 also serves as a duct for pressure-feeding purge air to the downward facing surface of the catalyst layer 2. An ignition device for a catalytic combustion burner as set forth in claim 1 of the utility model registration claim.