JPS6017615A - Catalytic combustion device - Google Patents

Abstract

PURPOSE:To quickly and surely enable to confirm the continuation of combustion and the presence and absence of ignition by a method wherein the heat of catalyst for combustion is transmitted to catalyst for ignition confirmation in order to red-heat its through-hole part. CONSTITUTION:The heat generated at an ignition heater during energizing is quickly transmitted through the tip part 10 of catalyst 9 for ignition confirmation and further the combustion heat generated at catalyst 1 for combustion is also quickly transmitted through the tip part 10 of the catalyst 9 for ignition confirmation and the contact surface between the catalyst 1 for combustion and the catalyst 9 for ignition confirmation in order to start combustion at the catalyst for ignition confirmation. Because the air flow resistance of the through- hole part 11 of the catalyst 9 for ignition confirmation is small, gas concentrates at the through-hole part 11, resulting in red-heating the part 11. Accordingly, the ignition confirmation can be done by monitoring the red-hot through hole part visually. Further, the continuation of combustion can also similarly be performed in the similar manner.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a catalytic combustion device for general household use that uses catalytic combustion heat as a heat source.

Structure of conventional examples and their problems Conventionally, fuels that are gaseous at room temperature such as butane, propane, methane, and hydrogen, and fuels that are liquid at room temperature such as kerosene, benzine, and methanol, have been used to produce precious metals such as Pt and Pd in glass. Catalytic combustion devices are well known in which combustion is performed on a catalyst supported on a carrier made of fiber, metal foam, nicum-like ceramic, etc., and this is used as a heat source. As general household appliances, it is applied to heating stoves, hair curlers, hair curlers, etc.

These catalytic combustion devices usually burn at a temperature of about 100 degrees Celsius and are flameless, so it is difficult to visually confirm combustion like with a normal flame burner. During steady combustion, there is a known method of indirectly sensing and confirming the heat in the combustion part using temperature-indicating paint, temperature-indicating tape, etc., but since it is indirect sensing, there is a problem with low reliability. ζ0 On the other hand, it was not possible to confirm whether ignition occurred at the start of combustion. Due to these problems, conventional catalytic combustion devices of this type have been difficult to use and have low safety.

Purpose of the Invention The present invention solves these conventional problems and provides a catalytic combustion device that is easy to use and highly safe, capable of confirming the continuation of combustion, quickly and reliably confirming the presence or absence of ignition. The purpose is to

Structure of the Invention In order to achieve the above object, the catalytic combustion device of the present invention comprises:
A combustion catalyst that has a combustion catalyst and an ignition confirmation catalyst that is placed in contact with the combustion catalyst and has a through hole in a part, and that uses the heat generated by the ignition heater to start combustion. The heat is quickly transferred to the ignition confirmation catalyst, causing the ignition confirmation catalyst, especially the vicinity of its through hole, to become red hot, making it possible to visually confirm the ignition and combustion state.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In Fig. 1, 1 is a combustion catalyst for oxidizing a mixture of vaporized fuel scum and air, and is made of a hot H material made of metal or ceramic, etc., and is equipped with numerous gas supply ports and 2. 04 arranged around the outer periphery of the pipe-shaped gas supply device 3 is an ignition heater, pt, pt
- It is made of a noble metal wire such as Ph or pd, which itself has an oxidation catalytic ability, a Ni-0r alloy wire, a stainless steel wire, or the like. 5 is a lead wire for supplying electricity to the ignition heater 4, and is connected to the battery via a switch or the like. 8
is an insulating tube for the lead wire 5. 9 is a catalyst for ignition confirmation,
It is in contact with the combustion catalyst 1, and the tip 1Q of the ignition confirmation catalyst 9 is placed in contact with or close to the ignition heater 4. Reference numeral 11 denotes a through hole provided in a part of the ignition confirmation catalyst, and is provided in the same direction as the flow direction of the vaporized fuel gas or the mixed gas of vaporized fuel gas and air in the ignition confirmation catalyst 9. Reference numeral 12 denotes a gas supply port of the ignition confirmation catalyst 9, which is provided in the gas supply device 3 to supply gas to the ignition confirmation catalyst 9. This is a 13-volume vaporized fuel gas injection nozzle, and is for injecting a certain amount of vaporized fuel gas to the gas supply device 3. Reference numeral 14 denotes an injector that utilizes the ejector effect of the vaporized fuel gas vigorously ejected from the gas injection nozzle 13 to suck in sufficient air necessary for combustion.

The operation in the above configuration will be explained. Turn on Sui Chiro
In this state, vaporized fuel gas is ejected from the gas injection nozzle 13, and sufficient air necessary for combustion is sucked in at the inlet of the injector 14 due to its ejector effect. Then, the sucked air and vaporized fuel gas are diffused and mixed while passing through the gas supply device 3 - from the gas supply port 2 to the combustion catalyst 1, and from the gas supply 1] 12 to the ignition confirmation catalyst 9. On the other hand, due to the operation of switch 6, the ignition heater is turned off almost simultaneously with the ejection of vaporized fuel gas.
- The circuit between the ignition heater 4 and the battery is closed, and a current flows through the ignition heater 4 to heat it. Therefore, the part of the combustion catalyst 1 that is in contact with the ignition heater 4 is heated, and the combustion catalyst 1
When the temperature reaches the catalytic combustion start temperature of the vaporized fuel gas, catalytic combustion is started. The heat generated by the ignition heater 4 when energized passes through the entire tip 10 of the ignition confirmation catalyst 9.
In addition, the combustion heat generated in the combustion catalyst 1 is transferred to the tip 1Q of the ignition confirmation catalyst 9, the combustion catalyst 1, and the ignition confirmation catalyst 9.
The ignition is immediately transmitted through the contact surface with the ignition confirmation catalyst 9, and combustion is started in the ignition confirmation catalyst 9. Since the ventilation resistance of the through-hole portion 11 of the ignition confirmation catalyst 9 is small, gas flows directly into the through-hole portion 11 or flows into the through-hole portion 11 through the ignition confirmation catalyst 9 . Unfortunately, the gas concentrates in the through-hole portion 11, and this portion becomes red-hot.

Therefore, by checking this red-hot part, ignition can be visually confirmed. You can also visually check the burning silk during steady combustion.

In addition, considering the durability of the catalyst 1 during combustion, it is usually desirable to keep the catalyst temperature below 700~s o O'C, and the catalyst temperature of the trench ignition confirmation catalyst 9 is set according to its purpose. It is desirable to increase the temperature from 700 to soo"C or higher. Therefore, in order to provide a difference in catalyst temperature between these two types of catalysts,
The amount of gas supplied from the gas supply port 12 of the ignition confirmation catalyst needs to be greater than the amount of gas supplied from the gas supply port 2. Normally, the gas supply port 12 of the catalyst for ignition confirmation
The amount of gas supplied from the gas supply port 2 is increased by 6 to 50% compared to the amount of mixed gas per unit area supplied from the gas supply port 2.

Further, since the ignition confirmation catalyst 9 reaches a high temperature as described above, it is required to have heat resistance. Therefore, as a catalyst carrier, in the case of a ceramic molded product, one with a high content of Al2O3 or Tt02 is used, and as a wool-like carrier, one with a high content of Al2O3 or Tt02 is used.
Ceramic wool with a high content of 5,5iOz or
Glass wool with a high 5iOz content is suitable. The amount of Pt and Pd supported on the catalyst is still 10% compared to 1% of the combustion catalyst.
It is preferable to increase the loading by about 10 times. In order to quickly confirm ignition, it is necessary for the catalyst carrier to have a small heat capacity and high thermal conductivity.For the former purpose, a wool-like carrier or a cloth-like carrier is preferable, and a ceramic molded carrier is preferable. The carrier is also required to have a thin wall thickness. Furthermore, for the latter purpose, it is also effective to mix a material with high thermal conductivity, such as a metal wire, in order to improve the thermal conductivity.

FIG. 2 shows another embodiment of the present invention, in which the ignition confirmation catalyst 9 is thinner than the combustion catalyst 1, as shown in the figure. In the case of catalytic combustion, the fuel gas concentration is high (in the case of propane, the fuel gas concentration is 4 with the theoretical air amount).
．． 02% and 3.13% for butane).Due to the high combustion rate, most of the combustion takes place at the mixed gas inlet of the catalyst, and as a result the catalyst temperature decreases at the mixed gas inlet, i.e. The temperature is close to 30. The same applies to the ignition confirmation catalyst 9, and even if the ignition confirmation catalyst 9 is provided with the through-hole portion 11 as in the embodiment of the present invention, the closer the through-hole portion 11 is to the gas supply device 3, the higher the temperature will be. There is. By reducing the thickness of the catalyst, the through-hole portion 11 of the catalyst 9 for ignition confirmation is placed on the viewing side, which has the effect of making confirmation of ignition and continued combustion more reliable. Furthermore, since the high-temperature part of the ignition confirmation catalyst 9 can be reliably visually observed, there is no need to increase the amount of mixed gas supplied per unit area as much as shown in the embodiment of FIG. It has the advantage of improving sex. Normally, the appropriate thickness of the ignition confirmation catalyst 9 is 3 mm or less.

FIG. 3 shows still another embodiment of the present invention, in which the through hole 11 of the catalyst for ignition confirmation and the center of the gas supply port 12 provided in the gas supply device 3 are aligned. As a result, the vaporized fuel gas or mixed gas coming out of the gas supply port 12 is reliably supplied to the inside of the through-hole portion 11 of the ignition confirmation catalyst 9, so that the through-hole portion 11 of the ignition confirmation catalyst 9 is reliably supplied. It becomes red hot and has the effect of making it more reliable to confirm ignition and continued combustion.

FIG. 4 shows still another embodiment of the present invention, in which the ventilation area of the through hole 11 of the ignition confirmation catalyst 9 is made smaller than the ventilation area of the gas supply port 12 of the ignition confirmation catalyst 9. be. As a result, the vaporized fuel gas or mixed gas ejected from the gas supply port 12 is supplied so as to be concentrated in the through-hole part 11, so that the red heat of the through-hole part 11 of the ignition confirmation catalyst 9 becomes more reliable, and ignition and This has the advantage of making the continuation of combustion more reliable, and widening the allowable range of assembly accuracy during manufacturing, making manufacturing easier. Although the case where there is one is shown, a plurality of them may be provided. Through hole part 1
Although various sizes of the hole diameter can be considered in relation to other members (a range of Jl mm to 3 mm is appropriate).

Effects of the Invention As is clear from the above embodiments, the catalytic combustion device of the present invention has an ignition confirmation catalyst in contact with a combustion catalyst and in contact with or in the vicinity of the ignition heater. , the heat from the combustion catalyst and the ignition heater can be quickly transferred, and as a result, ignition can be quickly confirmed, and since the ignition confirmation catalyst has a through hole, the through hole becomes red hot. This eliminates the immediate problem.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the main parts of a catalytic combustion device according to an embodiment of the present invention, and Figs. 2 to 4 are partial cross-sectional views of the main parts showing other embodiments of the present invention. It is. 1... Combustion catalyst, 2... Scrap supply 1
4...Heater for ignition, 9...Catalyst for ignition confirmation-11...Through hole portion.

Claims (4)

[Claims] (1) A combustion catalyst for oxidizing a mixed gas of vaporized fuel gas and air, and an ignition heater provided in contact with the combustion catalyst to start the oxidation reaction in the combustion catalyst. and an ignition confirmation catalyst, which is disposed in contact with the combustion catalyst and in contact with or near the ignition heater, and has a through-hole portion in part. (2) The catalytic combustion device 0 according to claim 1, wherein the ignition confirmation catalyst is thinner than the combustion catalyst. (3) The catalytic combustion device according to claim 1, wherein the through-hole portion of the ignition confirmation catalyst is provided in the same direction as the gas flow in the ignition confirmation catalyst. (4) The catalytic combustion device according to claim 1, wherein the ventilation area of the through hole of the catalyst for ignition confirmation is smaller than the ventilation area of the gas supply port.