JPS5913810A - Wick - Google Patents

Abstract

PURPOSE:To control the generation and accumulation of tar substance, thereby stabilize combustion for a prolonged period of time by a method wherein at least a part of a porous fuel vaporization section formed by adding a small amount of a bonding agent to a ceramic fiber material is impregnated and adsorbed with a platinum group catalyst. CONSTITUTION:A main wick 1 is formed by adding bonding agent such as polyacrylic acid ester to silica alumina type ceramic fiber material and an auxiliary wick 2 is formed of a knitted cloth mainly consisting of glass fibers. Further, fuel vaporization section 5 is adsorbed with a platinum black catalyst as the platinum group catalyst formed by reducing hexachloro platinum (IV) acid. Due to the fact that the platinum black catalyst displays its catalytic action sufficiently by being adsorbed by the surface of silica slumina and that the temperature of the fuel vaporization section 5 is suitable for the platinum black catalyst to covert a high boiling point component or a deteriorated component into a vaporizable substance by decomposition, it is possible to reduce the generation and accumulation of tar substance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wick for use in a liquid fuel combustor.

The so-called suction vaporization type combustor sucks up liquid fuel by the capillary action of the lamp wick and vaporizes the liquid fuel from the surface of the fuel vaporization section, which is exposed in the vaporization chamber of the wick, and burns it. Widely used in stoves, oil stoves, etc.

In this type of combustor, the fuel vaporization section is exposed to a high temperature and an atmosphere containing acid accumulation, so during combustion, part of the fuel contained in the fuel vaporization section becomes tar-like due to oxidation and polymerization reactions. The phenomenon of easily becoming a substance and accumulating in the fuel vaporization section occurred. In particular, if trace amounts of high-boiling components are mixed into the fuel (for example, when machine oil, light oil, salad oil, etc. are mixed into phantom oil), or some of the fuel components are altered (for example, when kerosene is heated for a long period of time or exposed to direct heat, ``Oxides, peroxides, resins, etc. generated when stored under light), the formation of tar-like substances.

Accumulation increases significantly.

When this tar-like substance accumulates in the fuel vaporization section, the capillary tubes on the surface or inside the fuel vaporization section are blocked, thereby inhibiting fuel suction and vaporization. As a result, the amount of fuel ←1 vaporized is abnormally reduced, causing problems such as the air-fuel ratio in the combustion chamber being disrupted and the generation of odor, soot, and toxic carbon monoxide. In addition, at the time of ignition, the tar-like substance quickly raises the temperature of the fuel vaporization part and prevents an increase in the amount of fuel vaporization, resulting in a significantly long period of time for stable combustion to occur. - Increased generation of carbon oxide, etc. In addition, the tar-like substance caused the wick to stick to the metal part that supported it, making it impossible for the wick to operate mechanically, making it impossible to extinguish the fire by lowering the wick.

The present invention aims to suppress the generation and accumulation of tar-like substances in order to eliminate such conventional drawbacks.

In order to achieve this object, the present invention provides platinum PT, logicum rh
Platinum is impregnated with a platinum group catalyst and adsorbed.

With this configuration, high boiling point components and degraded components, which are known factors for the generation and accumulation of tar-like substances, are transferred to the platinum group catalyst, that is, PTO, in the fuel vaporization section which is in a high temperature state.
It is easily decomposed and vaporized by the strong catalytic action of Therefore, high-boiling components and degraded components do not remain in the fuel vaporization section for a long time, and the conversion to tar-like substances due to polymerization reactions and the like is significantly reduced, making it possible to maintain stable combustion for a long period of time.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a vertical cross section of a lamp wick according to an embodiment of the present invention. 1 is the main window, and silica-alumina ceramic fiber (silica:alumina-5o:60, weight ratio) is used as a binder. It is formed by adding the polyacrylic ester used as an example, and by dispersing and adsorbing silicic acid anhydride.

Reference numeral 2 denotes an auxiliary core made of a braided cloth mainly made of glass fiber. 3 is the upper part of the wick, which is made of a braided cloth mainly made of cotton. The upper part of the 4u wick is made of braided cloth mainly made of polypropylene. Reference numeral 5 denotes a fuel vaporization section formed above the main window 1, which is exposed to the combustion chamber when installed in the combustor. In the fuel vaporization section 6, a platinum black catalyst made by reducing hexachloroplatinic (IV) acid is adsorbed as a platinum group catalyst. 6 is a cylindrical core attachment member fixed to the inner surface of the main window 1 and the auxiliary core 2, and 7 is the upper part of the suction core 3. This is a cylindrical suction core attachment member fixed to the inner surface of the suction core upper part 4.

8 is an adhesive tape.

In the above configuration, the liquid fuel passes from the suction wick upper part 4 to the suction wick 3, and then to the auxiliary wick 2. The fuel is sucked up to the main window 1 and vaporized from the surface of the fuel vaporization section 6. Here, the effects of this embodiment will be explained in detail along with the flow of fuel in comparison with the conventional example.

Figure 2 shows an example of a conventional lamp wick in which silicic acid anhydride is dispersed and adsorbed in the fuel vaporization part 6 of the main window 1 made of ceramic fiber and the auxiliary wick 2 made of glass fiber, and a cross section of the fuel vaporization part 6. Show the diagram. Further, FIG. 3 is a cross-sectional view of the fuel vaporization section 5 according to this embodiment, in which a platinum black catalyst is adsorbed.

That is, the fuel F (solid arrow) is sucked up inside the main window 1 and the auxiliary wick 2, and is vaporized from the surface of the fuel vaporization section 6.

At this time, in the conventional example, as shown in FIG. 2, the fuel is in the fuel vaporization section 6 during steady combustion.

Some parts tend to turn into tar-like substances due to the influence of temperature (approximately 200°C) and air. In particular, high boiling point components and altered components (white arrows) were susceptible to oxidation and monopolymerization reactions under the influence of temperature and air, and were converted into tar-like substances T and accumulated. However, as shown in FIG. 3, as the platinum group catalyst shown in this example,
In the fuel vaporization section 6 in which a platinum black catalyst made by reducing hexachloroplatinic (IV) acid is adsorbed on silica-alumina ceramic fibers, the platinum black catalyst is silica.

The platinum black catalyst is adsorbed onto the surface of alumina and fully exerts its catalytic action, and the temperature of the fuel vaporization section 6 (approximately 200°C) is such that the platinum black catalyst decomposes and vaporizes high-boiling components and altered components. Because it is suitable for converting into substances that are easy to change, the generation and accumulation of tar-like substances, etc., as in the past, is significantly reduced.

Incidentally, the results of combustion using a suction vaporization type oil combustor are shown in Figure 4. The fuel used was a mixture of white kerosene and salad oil at 0.1% by volume, and when comparing the effect on the reduction in calorific value due to the generation and accumulation of tar-like substances, it was found that the platinum black catalyst was adsorbed in the fuel vaporization section 6. The lamp wick according to this embodiment has significantly better heat generation retention characteristics than the conventional example, and has a tendency to reduce the generation of tar-like substances.

It can be seen that the accumulation is extremely low.

As described above, the lamp wick of the present invention includes a porous body formed by adding a small amount of a binder to ceramic fibers, and at least a portion of the fuel vaporizing portion thereof is impregnated with a platinum group catalyst such as platinum Pt or rhodium Rh.
By adsorbing it, the generation and accumulation of tar-like substances can be suppressed and stable combustion can be provided over a long period of time, which has a great practical effect.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a lamp wick according to an embodiment of the present invention;
FIG. 2 and FIG. 3 are explanatory diagrams of the operation of the lamp wick, and FIG. 4 is a characteristic diagram thereof. 1...Main window, 2...Auxiliary core, 5...
...Fuel vaporization section. Name of agent: Patent attorney Masao Nakao and 1 other person 2nd
Figure 3 Figure 4 Paralysis combustion between F18 (b over r)

Claims (1)

[Claims] A lamp wick in which at least a part of the fuel vaporization part of a porous body formed by adding a small amount of a binder to ceramic fibers is impregnated with and adsorbed with a platinum group catalyst such as platinum PT or Logicum Rh.