JPH0367911A - catalytic combustion device - Google Patents

Abstract

PURPOSE:To shorten the time it takes for temperature of catalyst to reach a catalytic combustion start temperature so that a preheater is not required and to prevent damages due to vibration, falling, shock etc., by applying metal oxide etc., as a carrier, to a base material, which is formed by weaving twisted yarns composed mainly or inorganic fibers, to carry catalyst metal thereon, and by superposing a plurality of said woven base materials on one another to form a catalyst body. CONSTITUTION:Metal oxides etc., as a carrier, are applied to a base material 11, such as silica cloth or alumina mixed cloth, which is formed by weaving twisted yarns composed mainly of inorganic fibers. And then a plurality of the woven fabrics, on which catalyst metal is carried, are superposed on one another to form a catalyst body 12. An ignition burner 13 is attached to the underside of the catalyst body 12 and a fuel feed nozzle 14 is provided beneath side body 12 to constitute a catalytic combustion apparatus. Since the catalyst body 12 has a small heat capacity and the time it takes for temperature of the body 12 to reach a catalytic combustion start temperature is short, a preheater is not required and generation of unburnt gas is limited. Further, the body 12 is composed of woven fabrics, preventing thereby damages due to vibration, falling, shock and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a catalytic combustion device used as a simple heating device.

BACKGROUND ART A conventional catalytic combustion apparatus of this type includes, for example, a catalyst body 1 made of cordierite ceramic, a preheater 2 located below the catalyst body, an ignition burner 3, and a fuel supply, as shown in FIG. A nozzle 4 is known. Further, as shown in FIG. 4, it is composed of a catalyst body 5 made of a ceramic fiber laminate (1), a heat insulating member 6 and a fuel supply nozzle 7 overlapping the lower side thereof, and the interior of the heat insulating member 6 is It is known that a preheater 8 is embedded in order to raise the temperature at the activation temperature l of the catalyst.

The lower part of the heat insulating member 6 serves as an air storage chamber and is provided with a dispersion pipe for uniformly distributing the combustion gas on the burner surface.

Problems to be Solved by the Invention Since the catalyst body of the conventional catalytic combustion apparatus described above has a large heat capacity, it takes a long time to reach the catalytic combustion starting temperature. Therefore, a preheater for preheating is required. Also,
When a cordierite ceramic is used as a catalyst for moving a combustion device, there is a problem in that the catalyst is damaged by vibrations during movement.

The present invention is intended to solve these problems, and aims to shorten the time required to reach the catalytic combustion start temperature, eliminate the need for a preheater, and eliminate damage to the catalyst body due to vibrations and the like.

Means for Solving the Problem (2) In order to solve this problem, the present invention provides a method in which a metal oxide or the like is supported as a carrier on a base material formed of a woven fabric made of twisted yarns based on inorganic fibers. After that, a catalyst body made by stacking a plurality of M woven fabrics each carrying a catalyst metal is provided.

Effect: With this configuration, the catalyst body has a small heat capacity, and the time required to reach the catalytic combustion start temperature can be shortened, a preheater is not required, and unburned gas is generated less. Furthermore, since the catalyst body is made of woven fabric, there is no damage caused by vibrations or dropping impacts.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

To explain the first embodiment shown in FIG. 1, 1
A catalytic combustion device is constructed by laminating two sheets of silica cloth, with an ignition burner 13 attached to the lower part of the catalyst body 12, and a fuel supply nozzle 14 provided below the catalyst body 12. .

Next, we will explain the second embodiment shown in FIG. This makes up a catalytic combustion device.

In place of the silica cloth 11, an alumina mixed fiber cloth can also be used, and these cloths are woven from twisted yarns based on inorganic fibers, and after supporting a metal oxide or the like as a carrier on a base material, the catalytic metal is The following 11 combinations of the plurality of woven fabrics in the above two embodiments can be considered.

1) Silica cloth - Silica cloth 2) Silica cloth - Alumina mixed fiber cloth 3) Alumina mixed fiber cloth - Alumina mixed fiber cloth 4) Silica cloth - Silica cloth - Silica cloth 5) Silica cloth - Silica cloth - Alumina mixed fiber cloth 6 ) Silica cloth - Alumina mixed fiber cloth - Silica cloth 7) Alumina mixed fiber cloth - Silica black cloth (4) Cuffloss 8) Silica cloth - Alumina mixed fiber cloth - Alumina mixed fiber cloth 9) Alumina mixed fiber cloth - Silica cloth - Alumina mixed fiber cloth 10) Alumina mixed fiber cloth - Alumina mixed fiber cloth -
Silica cloth 11) Alumina mixed fiber cloth - Alumina mixed fiber cloth - Alumina mixed fiber cloth In the above configuration, 2 to 3 pieces of silica cloth or alumina mixed fiber cloth are laminated, but 4 or 5 pieces of silica cloth or alumina mixed fiber cloth are laminated. The catalyst body 12 made by this lamination has a small heat capacity and takes a short time to reach the catalytic combustion start temperature, so there is no need to provide a preheater.
There is also little generation of unburned gas. Furthermore, since the catalyst body 12 is made of woven fabric, it will not be damaged by vibrations, dropping impacts, or the like. Among them, the alumina mixed fiber cloth has the advantage of being able to withstand high-temperature use.

Effects of the Invention As described above, according to the present invention, a woven fabric is produced by supporting a metal oxide or the like as a carrier on a base material formed from twisted yarns made of inorganic fibers, and then supporting a catalytic metal. Since the catalyst body is made by stacking multiple layers of the catalyst, the heat capacity of the catalyst body is small, and the time required to reach the catalytic combustion start temperature can be shortened, a preheater is not required, and unburned gas is generated less. Become. Since the catalyst body in the housing is made of woven fabric, there is no damage caused by vibrations or drops.

[Brief Description of the Drawings] Figures 1 and 2 are schematic perspective views showing the first and second embodiments of the present invention, and Figures 3 and 4 are schematic perspective views showing different conventional examples. It is a diagram. 11...Silica cloth, 12...Catalyst body, 13...
Ignition burner, 14...fuel supply nozzle.

Claims (1)

[Claims] 1. After supporting a metal oxide or the like as a carrier on a base material made of a woven fabric made of twisted yarns based on inorganic fibers, a catalyst body made by stacking multiple layers of woven fabrics supporting catalyst metals is provided. catalytic combustion equipment.