JPS5840412A - Petroleum combustor - Google Patents

Abstract

PURPOSE:To prevent the production of unburnt gas and to prevent an offensive ordor by a method wherein an oxidation catalyst is placed in a cleanrance of the combustion cylinder. CONSTITUTION:A small hole 2 for providing an instanteneous fire distinguishing is prepared at the side wall of the core storing cylinder 1. In the core storing cylinder 1 is stored a combustion core 3 being closely contacted to the side wall of the cylinder, and the combustion core 3 is moved up and down with a core lifting knob 4 so as to adjust a thermal power. In case of an automatic instanteneous fire distinguishing, combined with a sensing unit, the small hole 2 of the core storing cylinder 1 is located higher than the upper end of the combustion core 3. Further, an oxidation catalyst 11 is placed in the clearance 10 of the combustion cylinder formed by the chimney inner flame cylinder 8 and the outer flame cylinder 9. Then, the gasified petroleum is completely oxidised in case of fire distinguishing and accordingly the production of an offensive odor may be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustor structure for preventing the foul odor that is likely to occur when extinguishing a fire, which is one of the drawbacks of oil combustors.

Currently, oil burners, especially portaple oil stoves, are used in many households because the fuel cost is lower than gas stoves, but the portaple oil stove has almost completely solved the problem of odor during normal combustion. When the thing ignites,
Incomplete combustion, which tends to occur when extinguishing a fire, produces a bad odor, and although many efforts have been made to prevent this, it is still not perfect.

In particular, the portable kerosene stoves with upper and lower wicks that have recently appeared on the market have a small hole in the wall of the wick storage tube for instant extinguishing. If the combustion wick is lowered closely to the wall, the space created as a result of the downward movement of the combustion wick temporarily suppresses the upward draft of the combustion cylinder, but due to the temperature difference between the inside and outside of the wick storage cylinder,
Since there is negative pressure inside, when the combustion wick falls below the small hole, the small hole suddenly opens, and air is instantly blown into this negative pressure area from the small hole, diluting the vaporized petroleum gas. The flame in the gap between the combustion cylinders does not propagate to the combustion core and is instantly extinguished.

However, with this method, when the wick is lowered, a large amount of cold air is supplied from the small hole into the wick housing cylinder, so the wick housing cylinder is rapidly cooled and the vaporized petroleum gas remains incompletely combusted. On the contrary, it causes a bad odor.

Although some improvements have been made to these shortcomings, a method has been proposed in which an oxidation catalyst is placed above the combustor to catalytically combust the odor. However, this method does not guarantee that all of the odor passes through the catalyst layer. However, the purpose of the present invention is to use small holes in the wall of the wick housing cylinder for instantaneous extinguishing, but for normal extinguishing, it is difficult to completely prevent bad odors. To provide an oil combustor which prevents the occurrence of a bad odor during normal extinguishing by closing small holes for extinguishing a fire, and completely prevents leakage from gaps in the combustion cylinder.

Next, the oil combustor of the present invention will be explained based on examples. FIG. 1 is a sectional view showing an embodiment of the oil combustor of the present invention. In the figure, reference numeral 1 denotes a wick housing cylinder, and a small hole 2 for instantaneous extinguishing is provided in the side wall of the cylinder. A combustion wick 3 is housed in the wick storage cylinder 1 in close contact with its side wall, and the combustion power is adjusted by moving the combustion wick 3 up and down with a wick up and down knob 4. When automatic instantaneous extinguishing is performed in combination with a seismic sensor, the small hole 2 of the wick housing cylinder 1 is positioned above the upper end of the combustion wick 3.

This core upper and lower knob 4 is connected to a rotary track 6 via a reduction gear 5.
are held together, and the shaft 7 is configured to be moved in the vertical direction by the rotation of the rotary track 6.

During combustion, the combustion wick 3 and the wick housing tube l are in close contact with each other as shown in the figure, so that the inflow of air from the small holes 2 into the combustion section is largely cut off. When the automatic instantaneous extinguishing function is activated in such a state, air can flow into the upper part of the combustion wick from the small hole 2), thereby achieving instantaneous extinguishment, but at the same time, unburned gas also occurs.

On the other hand, as shown in FIG. 2, during normal fire extinguishing, that is, when extinguishing a fire by operating the wick upper and lower knobs 4, as the wick upper and lower knobs rotate 40 times, the combustion wick 3 is lowered and stored in the wick storage tube 1. , the vaporization of the oil is suppressed and the flame quickly becomes smaller. By operating the lead upper and lower knobs 4, the damper 7 provided inside the lead storage cylinder 1 is raised, the small hole 2 of the lead storage cylinder 1 is closed, and air flows into the lead storage cylinder 1. Since this is prevented, the core housing cylinder 1 is not cooled down rapidly.

Therefore, the flame does not go out and turns into a small blue ball-shaped flame at the top of the wick housing cylinder l, and the vaporized gas is completely burned. Then, when the core housing cylinder is sufficiently cooled and vaporization stops,
The fire will finally be extinguished.

Therefore, even if the oil is slightly vaporized from the combustion wick 1, the wick housing cylinder will be kept at a high temperature for a while, so if air is completely supplied from the top, it will turn away and become a ball of flame. Complete combustion will prevent the generation of bad odors due to unburned gas, but if the air supply from the top is not sufficient, some unburned gas will flow out and cause a bad odor. Become.

In order to prevent the generation of such a small amount of unburned gas, the present invention further provides an oxidation catalyst 11 in the combustion tube gap 10 formed between the chimney inner flame tube 8 and the outer flame tube 9. It is being During fire extinguishing, the petroleum vapor gas is completely oxidized and the generation of bad odors can be prevented.

In general, oxidation catalysts have conventionally been metal oxides such as hobcalide, and noble metals such as platinum and palladium, but metal oxide catalysts have the disadvantage of quickly degrading in the presence of water vapor and having a short lifespan. Noble metal catalysts are made by supporting precious metals on a carrier with a large specific surface area, such as alumina or silica, and platinum, tsucladium, etc. have been used, but they have the problem that they do not exhibit activity unless they are heated to high temperatures. The oxidation catalyst used in the present invention is one that completely burns unburned vaporized gas when extinguishing an oil combustor, so firstly, it must be active at relatively low temperatures, and secondly, it must be one that does not deteriorate quickly in the presence of water vapor. Must. As a result of various studies on oxidation catalysts that satisfy these conditions,
We discovered that an oxidation catalyst in which one or more elements selected from the group of ruthenium, rhodium, and platinum and radium or only radium was supported on a carrier made of an alkali cement material was optimal. Ta. In particular, as an alkali, potassium carbonate9. Potassium hydroxide.

Examples include calcium hydroxide and sodium carbonate, but potassium carbonate was chosen for its ease of use and performance. Also,
The cement material is Portland cement.

There are calcined gypsum, bentonite, lime aluminate, etc., but lime aluminate was the best in terms of performance.

The active substances of the carrier are platinum, roseum, and ruthenium.

・We considered precious metals such as radium. These are excellent oxidation catalysts, are abundant in resources, and are relatively inexpensive.
Lanium alone or with other precious metals, especially platinum,
The combination of palladium had excellent oxidation properties and was optimal.

As explained above, in the present invention, in an oil combustor in which a small hole for instantaneous extinguishing is provided in the wick housing cylinder,
A damper that opens and closes the small hole in conjunction with the rotation of the upper and lower wick knobs is provided to assist in the combustion of vaporized gas during extinguishing, and an oxidation catalyst is placed in the gap between the combustion cylinders, making it easy to prevent unburned gas from burning. It is possible to completely prevent gas leakage and provide an inexpensive oil combustor that does not generate bad odors.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a portable kerosene stove with an upper and lower wick, showing an embodiment of the present invention, during combustion, and FIG. 2 is a cross-sectional view of the stove when the combustion wick is lowered with a knob to extinguish the fire. l... Core storage cylinder, 2... Small hole, 3... Combustion wick, 4
... Core upper and lower knobs, 5 ... Reduction gear, 6 ... Rotating track, 7 ... Damper, 8 ... Chimney inside J[,9.
...Chimney-outer flame tube, 10...Combustion tube gap, 11...
・Oxidation catalyst. Figure 1 Figure 2

Claims (3)

[Claims] (1) A small hole for instant fire extinguishment is provided in the wall of the wick storage cylinder, and when the wick is manually lowered to extinguish the fire, the small hole is closed. An oil burner characterized by being provided with. (2) The oxidation catalyst is formed by supporting one or more elements selected from the group of ruthenium, ro, dium, and platinum and glossy radium simultaneously or by supporting only the mother radium on a carrier made of an alkaline material and a cement material. An oil combustor according to claim 1, characterized in that: (3) The oil combustor according to claim (2), wherein potassium carbonate is selected as the alkaline material, and lime aluminate is selected as the cement material.