JPS5831203A - Combustion wick - Google Patents

Abstract

PURPOSE:To obtain stable combustion for a wick, by determining a specific value as the rate of surface-active agent occupied in a coating material, as well as to impregnate a fuel vaporizing part, made of ceramic fiber, with the coating material, made of inorganic pigment, silica, and surface-active agent. CONSTITUTION:A main wick is made of ceramic fiber of silica-alumina system, added with polyacrylic ester. A fuel vaporizing part 3 is impregnated with coating material, made of inorganic pigment, silica, and surface-active agent, and the rate of surface-active agent occupied in the coating material is 0.2-5%. With such an arrangement, generation and accumulation of tar material are inhibited, so that stable combustion can be obtained for a wick for a long time.

Description

Detailed Description of the Invention The present invention relates to a combustion wick used in a liquid fuel combustor, and its purpose is to suppress the generation and accumulation of tar-like substances in the fuel vaporization part of the combustion wick and maintain stable combustion for a long period of time. The purpose of the present invention is to provide a combustion wick that can be used.

All liquid fuel is sucked up by the capillary action of the combustion wick, resulting in low
``The liquid fuel is vaporized from the tip part of the combustion wick exposed in the vaporization chamber, that is, the surface of the fuel vaporization part, and the liquid fuel is charged into the combustor.
The so-called double vaporization type combustor 21 is widely used in kerosene stoves, oil stoves, etc. In this type of combustor, the fuel vaporization section is heated to a high temperature and is in an oxygen-containing atmosphere. Because of the exposure to In particular, trace amounts of high-boiling components may be mixed into the fuel (for example, machine oil or light oil in kerosene).

(If salad oil etc. is mixed in), or if some of the fuel components have deteriorated (for example, oxides, peroxides, resins, etc. that are generated when kerosene is stored at high temperatures for a long period of time or under direct sunlight). The generation and accumulation of the tar-like substance increases significantly.When this cool substance accumulates in the fuel vaporization part, the capillary tubes on or inside the fuel vaporization part are blocked.
, fuel uptake and vaporization are inhibited. As a result, the amount of fuel vaporized decreases abnormally, and as a result, the calorific value decreases significantly.
The air-fuel ratio in the combustion chamber was disrupted, causing problems such as odor, soot, and carbon monoxide. At the time of ignition, the tar-like substance causes the temperature of the fuel vaporization part to rise rapidly, preventing an increase in the amount of fuel vaporization, and it takes an extremely long time to reach stable combustion, during which time the odor caused by unstable transient combustion is generated. There was a lot of growth caused by air, soot, carbon oxide, etc. Furthermore, the tar-like substance completely adhered to the combustion wick and the supporting metal parts, making it completely impossible to extinguish the fire by lowering the combustion wick on the ship. There were some dangerous situations.

The present invention aims to suppress the generation and accumulation of tar-like substances in order to eliminate these conventional drawbacks.One embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a fresh flower, which was formed by adding a tray of silica-alumina ceramic fiber (silica:alumina = 450:502 weight ratio) and polyacrylic acid ester used as an example of an organic binder. 2 is a sucker wick made of polypropylene cloth and connected to fresh flower 1.
ing. Reference numeral 3 indicates a fuel vaporization section formed in the base section 1, which is exposed to the combustion chamber when installed in the combustor. The fuel vaporization section 3 is completely impregnated with a paint consisting of an inorganic pigment, anhydrous silicic acid, and a surfactant.211) The proportion of the surfactant in the paint is 0.2 to 6%. 4 is sewing thread, 6
is adhesive tape.

In the above configuration, the liquid fuel is sucked up from the suction wick 2 to the fresh flower 1 and vaporized from the surface of the fuel vaporization section 3. Here, the effects of this example will be explained in detail in comparison with the flow of fuel, the conventional example, and the proportion of surfactant in the paint.

FIG. 2 shows a conventional fuel vaporizing section 3 made of only ceramic fibers. Figure 3 shows an inorganic pigment in the fuel vaporization section 3.

It is impregnated with a paint consisting of silicic anhydride and a surfactant, and the ratio of the surfactant to the paint is 0.1. Fig. 4 shows a fuel vaporization section 3 impregnated with the paint. Figure 5 shows a case in which the fuel vaporization section 3 is impregnated with the paint, and the total proportion of surfactant in the paint is 10%. A cross section of each is shown.

That is, the fuel F (solid arrow) is sucked up inside the main body 1 and vaporized from the surface of the fuel vaporization section 3. At this time, in the conventional example, as shown in FIG. 2, a large amount of the fuel F is vaporized from the tip of the fuel vaporizing section 3. However, trace amounts of high-boiling components and degraded components in the fuel do not easily vaporize. For this reason, high-boiling components and altered components of the rice were accumulated at this tip, and under the influence of temperature and oxygen, they changed into a tar-like substance T (white arrow) and accumulated.

Furthermore, as shown in Figure 3, when the proportion of surfactant in the paint is set to 0.1, the paint is
It is difficult to penetrate, and a large amount is easily adsorbed on the surface of the fuel vaporization section 3. Therefore, the pore diameter on the surface of the fuel vaporization section 3 becomes too small, and the amount of vaporization decreases significantly. This caused a problem in that the calorific value decreased significantly and the pores were also easily clogged with tar components. However, as shown in Figure 4,
When the proportion of surfactant in the paint is 1, the paint penetrates into the ceramic fibers to some extent, so the pore size on the surface of the fuel vaporization section 3 does not become too small, and the amount of vaporization decreases significantly. (The calorific value does not decrease. Therefore, as the amount of vaporized gas is reduced by pumping into the fuel vaporization section 3, the heat of trace amounts of high boiling point components and altered components in the fuel due to the accumulation of heat amount. The decomposition proceeds smoothly and no accumulation of cool substances occurs.Furthermore, the inorganic pigments and silicic anhydride in the paint are a type of oxidation catalyst, and their catalytic action accelerates this thermal decomposition action. However, when the proportion of the surfactant in the paint is set to i10 as shown in Figure 6, the paint penetrates into the ceramic fibers too much, and the pore size on the surface of the fuel vaporization section 3 becomes smaller. In addition, the pore diameter inside the fuel vaporization section 3 becomes smaller, resulting in insufficient supply of fuel F to the surface of the vaporization section, and tar accumulation inside the vaporization section becomes easy.Furthermore, if the amount of surfactant is Therefore, the problem that the surfactant itself causes tar becomes noticeable.

Incidentally, Figure 6 shows the results of combustion using a suction vaporization type oil combustor. The fuel used was a mixture of white kerosene and 0.1 volume of sarada oil, and the following four types of combustion wicks were used.

(1) The fuel vaporization section 3 is made of silica-alumina heptamyl fiber and is untreated.

(2) The fuel vaporization section 3 of (1) above is impregnated with a coating composition consisting of an inorganic pigment, anhydrous silicic acid, and a surfactant,
Ratio of surfactant in paint (r-Q, 1 inch).

(3) The above (1) is impregnated with the same paint as in (2), and the total proportion of surfactant in the paint is 1.

(4) Completely impregnated with the paint of (1) K (2) above, with the proportion of surfactant in the paint being 10%.

Comparing these four types, as shown in Figure 6, the one with a surfactant ratio of 1 (3) is different from the untreated one (1).
), the decrease in calorific value was significantly reduced compared to (2) where the proportion of surfactant was 0.1%, and (4) where the proportion of surfactant was 10%.

′-! In addition, when we compare the effects of the ratio of surfactant in the paint on the reduction of heat generation, as shown in Figure 7, when the ratio of surfactant is 0.2 to 6, the amount of heat generated is maintained. It can be seen that the characteristics are extremely good.

As described above, the combustion wick of the present invention has a fuel vaporization section made of ceramic fibers impregnated with a paint consisting of an inorganic pigment, anhydrous silicic acid, and a surfactant, and the ratio of the surfactant to the paint is 'io. , 2 to 5%, generation of tar-like substances, accumulation and suppression, and stable combustion over a long period of time can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a combustion wick according to an embodiment of the present invention, FIGS. 2 to 6 are explanatory diagrams of the operation of the combustion wick, and FIGS.
The figure shows its characteristic diagram. 1... main intention, 2... suction wick, 3...
...Fuel vaporization section. Name of agent: Patent attorney Toshio Nakao and 1 other person
2 Figure 3

Claims (1)

[Claims] A paint consisting of an inorganic pigment, anhydrous silicic acid, and a surfactant is completely impregnated into at least a part of the fuel vaporization part of a porous body formed by adding a small amount of organic ingu to ceramic fibers,
A combustion wick characterized in that the proportion of the surfactant in the paint is 2 to 5%.