JPS59208313A - Exothermic device - Google Patents

Abstract

PURPOSE:To provide a combustion device which is of a small size and light in weight and can perform safe combustion for a long time, by a method wherein contact oxidation reaction is made in gas fuel, produced by evaporating methanole, ethanole, ether, aceton, methane, buthane, etc., by means of a ceramic porous material by which a platinum group metal is carried. CONSTITUTION:The lower part of a fuel feed porous material 3 is conditioned to be immersed in fuel 2 stored in a fuel tank 1, and thereby the liquefied fuel 2 is sucked up by a capillary phenomenon, and almost of the fuel produces a gasified fuel during the suction process, and if a shutter 4 is opened, the fuel flows upward and is fed to a ceramic porous material 5 by which a catalyst component located above the shutter 4 is carried. Thereby, the gasified fuel performs oxidation reaction, i.e., combustion by the action of platinum, being a catalyst component, within a ceramic porous material 5. Utilization of excellent oxidation catalyst action of a platinum group metal enables efficient combustion for a long time without needing an ignition source.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat generating device that burns vaporized residue of liquid fuel, gaseous fuel Fl.

- Generally speaking, liquid fuel is burnt by bundling cellulose such as cotton, glass wool, or asbestos, or sucking it up with a so-called "wick" made of woven fabric, and then burning it at the tip of the core.
A separate ignition source is brought close to part i, and part of the ignited fuel is vaporized and combusted.
A method in which combustion is continued continuously by vaporizing and burning fuel, or a method in which fuel is supplied in the form of a spray and is ignited by a separately provided ignition source to produce a combustion flame with a large calorific value. Combustion methods are common.

However, although the combustion method described above can generate a relatively large amount of heat, it requires a large combustion device, requires an ignition source, and has a high risk of causing a fire due to the generation of flames. In addition, it has been difficult to efficiently combust ``baka-combustion'', which has many drawbacks such as the inability to obtain inexpensive equipment that allows continuous combustion over a long period of time by completely combusting minute amounts of heat.

The present invention is a heat generating device developed in view of the above, which is small and lightweight, can burn safely for a long time, and burns fuel efficiently.

Hereinafter, embodiments of the present invention will be specifically described in detail with reference to the drawings.

Fig. 1 is a basic configuration diagram of the device of the present invention, in which 1 is a fuel tank for storing fuel 2, 3 is a fuel outlet porous body arranged so that its lower part is immersed in the fuel 2; The derived porous body 3 is made of porous ceramic or asbestos having pores of about 50 to 500 cells per square inch.
It is composed of a bundle of glass wool, carphone fiber, etc.

The mango 4 uses a shutter to adjust the amount of fuel delivered from the porous fuel delivery body 3 or to stop the supply. Reference numeral 5 denotes a ceramic porous body, and the ceramic porous body 5 has a honeycomb shape with a large number of pores such as triangular, square, hexagonal, circular, etc., or a three-dimensional network with irregularly shaped pores. The oxidation catalyst components, platinum (Pt), palladium (Pa
) Rhodium (, Rh) and other platinum group metals are supported in an amount of about 0.5 to 5 g per 1β capacity.

Furthermore, 6 is a container for storing small objects to be heated, and the shape of this container 6 may be selected depending on the amount and properties of the objects to be heated.

Next, the operation of the heat generating device configured as described above will be explained. Now, since the fuel 2 stored in the fuel tank 1 is immersed in the lower part of the fuel derivation porous body 3, the liquid fuel 2 is sucked up by capillary action, and in this sucking process, most of the fuel is becomes vaporized fuel, and when the shutter 4 is open, it rises and is sent to the ceramic porous body 5 disposed in the upper part of the shack 4 and carrying catalyst components. Therefore, the vaporized fuel undergoes an oxidation reaction, that is, combustion, in the ceramic porous body 5 due to the action of platinum, which is a catalyst component. Combustion heat is generated along with the oxidation reaction of the vaporized fuel, so the oxidation reaction of the vaporized fuel continuously sent from the fuel deriving porous body 3 is promoted and expanded in the ceramic porous body 5, and the vaporized fuel is continuously As a result, the oxidative combustion effect continues on the silk, and the generated combustion heat causes the container 6 to
The object to be heated (
(not shown).

On the other hand, if the capacity of the ceramic porous body 5 carrying platinum group metals to cause an oxidation reaction is sufficiently large, the amount of heat generated is approximately proportional to the amount of vaporized fuel supplied. By adjusting the degree of opening of the shutter 4, the amount of heat generated and the temperature of the shutter can be controlled, and by closing the shutter 4, the heat generating operation can be stopped.

By the way, as mentioned above, for the liquid fuel to be combusted in the heat generating device of the present invention, the 611 points at which the liquid fuel is combusted under 1 atm are 30 degrees.
Methanol (64°C), ethanol (78°C)
C) It is preferable to use an OJ flammable organic liquid with a relatively low 011 point, such as ether (34'C) or acetone (54°C).Also, kerosene, kerosene, etc. may be used; Figure 2 (a) for things
As illustrated in (b), the heater II is embedded in each of the fuel derivation porous body 3 and the ceramic porous body 5,
The oxidation combustion reaction can be further promoted by heating the heater 11 by supplying electricity from the battery I3.

Furthermore, the fuels to be used for combustion are not limited to those that are liquid at room temperature and normal pressure, such as alconite, ether, and acetone, but also fuels that become liquid under pressure and gaseous at room temperature and normal pressure, such as butane, ethane, and mekun. In this case, a porous fuel outlet body 3 may be provided to rectify the flow of the supplied gaseous fuel, but it is not necessarily necessary in this case.

Next, Table 1 lists experimental examples using the apparatus of the present invention.

In these experimental examples A-G, the rise of the combustion reaction can be determined by controlling the temperature at a position 5 mm directly above the center point of the porous ceramic body 5 and the elapsed time from the time when the fuel starts being supplied to the porous ceramic body 5. What I found interesting was the graph in Figure 3.As can be seen from the graph, when the same fuel was used, the porosity of Buddhist porous body 3 and ceramic porous body 5 was large, that is, the number of cells was large. Those equipped with ceramic porous bodies 5 that have a large volume and a large volume have a faster temperature rise, and a higher temperature i;,
'There is a tendency to be accepted. This is because, as is clear from the experimental examples Δ, B, and C, the contact area between the vaporized fuel and the catalyst component is large, and the oxidation reaction is accelerated. Conceivable.

On the other hand, as shown in Experimental Example D-G, the oxidation reaction starts slowly when the ceramic porous body 5 has a small volume even if the number of cells is large. The rise value is only about 70°C, so heating to a relatively low temperature is not recommended! : It can be seen that it is suitable for the configuration of the first equipment. Also, as in experimental examples F and G, the fuel '6%
When a low temperature is used, the rise of the oxidation reaction is extremely slow, and the temperature rise remains within the range of 20 to 40°C. Therefore, even if the heating device is the same, it is possible to control the amount of heat generated and the temperature rise depending on the concentration of the supplied fuel.

Note that in the experimental examples listed in Table 1 above, only methanol was used as the fuel A:J;
゛When other flammable liquids such as ethanol acetone were used, almost the same tendency for oxidation (combustion) reaction was observed, although the temperature did not increase.

In addition, gaseous fuel such as butane at normal temperature and pressure can be mixed with ceramic,
The rise of the oxidation reaction was investigated by supplying gaseous fuel to the porous body 5, and almost the same tendency was observed even when such gaseous fuel was used. However, as in the case of using liquid fuel with a high boiling point, in order to cause an initial oxidation reaction,
It was easily possible to cause and continue the oxidation reaction by applying heat in advance using a heater H embedded in the ceramic porous body 5 as shown in FIG.

By the way, the ceramic porous body 5 for oxidizing (combusting) the combustible gas must have as large a volume as possible in order to cause a sufficient reaction. Although 0.5 to 5 g of group metal was supported, a cell number of 6;j and 20 to 600 cells/R1 was compatible with the structure of the heat generating device of the present invention and was convenient to use.

In addition, in the embodiment of the present invention, the fuel deriving porous body 3 and the ceramic porous body 5 are constructed as separate bodies, respectively.
This is done by using l(N, for example, an integrated ceramic porous body, and adding '/l' to the fuel 2 in the fuel 'A', -1 tank 1.
In order to carry out an oxidation reaction (combustion) of the vaporized fuel in the lower half, the lower half that sucks up the fuel 2 and vaporizes it carries a platinum group metal. It may be supported. In this case, to start and stop the combustion operation, either cut off the supply of oxygen (air) to the part of the ceramic porous body that undergoes the oxidation reaction, or immerse the part in liquid fuel to form the fuel-delivery porous body. Alternatively, the entire ceramic porous body may be raised vertically away from the fuel liquid level.

The shape of the container 6 placed above the ceramic porous body that causes the oxidation reaction does not need to be specified and can be of any shape as long as it is suitable for containing the object to be heated in the container 6. Just use something.

As described above, according to the present invention, it is a device that utilizes the unique oxidation catalytic action of platinum group metals, which support vaporized gaseous fuel or liquid fuel on a ceramic porous body. Therefore, we have proposed a low-cost heat generating device that does not require an ignition source, is small and lightweight, can be burned for a long time, is efficient (combustible), and is safe and can be used in many ways without the risk of causing a fire. (It has many cool characteristics, such as being able to

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a heat generating device according to an embodiment of the present invention, and FIG.
Figures (a) and (b) are broken sectional views showing other embodiments of only the fuel deriving porous body 3 and the ceramic porous body 5 in FIG. 1, respectively. FIG. 3 is a graph showing the relationship between increased temperature and reaction time in an experimental example using the apparatus of the present invention. ■=Fuel tank 2: Liquid fuel 3: Fuel derivation porous body 4: Shanokou 5: Ceramic porous body 6: Container applicant Kyocera Co., Ltd. Company representative Kazuo Inamori Figure 1 Figure 2 (G)

Claims (1)

[Claims] Platinum group metals such as platinum and palladium are supported through a fuel tank containing fuel such as methanol, ethanol, ether, acetone, methane, ethane, and methane, and a fuel outlet porous body that guides the fuel in the fuel tank. A ceramic porous body is provided, and the vaporized fuel released from the upper end of the above-mentioned warm material deriving porous body is combusted by the ceramic porous body. A heat generating device that is a sign of IS.