JPS6131367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a combustion device for a combustion appliance such as an oil stove that uses oil as fuel.

Combustors used for heating mainly use gas, liquid, or solid fuels. Gaseous fuels are mainly city gas, liquid fuels are petroleum, and solid fuels are coal, wood, etc. It is used. Generally, city gas and oil are the mainstream for home heaters, but oil is particularly popular because it is easy to transport the fuel and the combustor itself is easy to move. However, the kerosene heaters of the wick type and the wick type, such as the reflection type and the convection type, which are used for room heating in general homes, emit a foul odor that is unpleasant to humans due to the evaporation of oil when they are ignited, extinguished, and especially when extinguished.

The present invention removes bad odors caused by a chemical reaction by placing a catalyst in a kerosene stove when extinguishing a fire.It can be installed relatively easily without changing the shape of the combustion cylinder, and it produces a strong odor. The object of the present invention is to provide a combustion device with a catalyst that can obtain a high removal rate.

It is well known to users of kerosene heaters that when a reflection or convection type kerosene heater is used to extinguish a fire, the petroleum fuel evaporates and fills the room, creating a foul odor.

Although bad odors vary from person to person, they can have an adverse effect on human physiology, such as discomfort and headaches. Many kerosene stove manufacturers have made various proposals for eliminating or preventing the above-mentioned foul odor. For example, for models that ignite and extinguish the fire by moving the wick up and down, proposals have been made to instantly lower the wick to extinguish the fire and prevent oil from evaporating, or to cover the top of the wick with a metal plate, etc. to extinguish the fire. ing.

In contrast, the present invention uses a catalyst to remove petroleum evaporated components, and the present invention will be described in detail below with reference to figures showing examples.

FIG. 1 shows a typical schematic configuration of a commercially available reflective kerosene stove. In the figure, 1 is an outer case, 2 is a ceiling plate with a plurality of openings, 3 is a combustion tube installed in the outer case 1 and the ceiling plate 7, and a coil 4 is installed in the upper part of this combustion tube 3. A metal plate 5 and a net 6 are installed, and a core adjustment dial 7 provided on the front surface of the outer case 1 is used to adjust the core. Note that a reflector plate 8 is installed at the rear of the combustion tube 3 to reflect heat to the front side.

FIGS. 2 to 6 show the installation position and installation method of the catalyst in such a kerosene stove. In the figure, parts that are the same as those in FIG. 1 are designated by the same numbers.

In Fig. 2, a fixing hole is provided in the ceiling plate 2 at the same position as the center position of the combustion tube 3, and the length is 50 mm.
A metal rod 9 with a diameter of 12 mm is inserted through the same hole in the direction where the combustion tube 3 is located, one end of this metal rod 9 is fixed to the ceiling plate 2, and the other end of the metal rod 9 has a diameter of 12 mm.
An 8mesh plate-shaped stainless steel net 10 made of mm SUS304 wire is fixed, and this stainless steel net 10 is
A catalyst layer 12 surrounded by a cylindrical SUS304 plate 11 with a diameter of 120 mm, a plate thickness of 0.5 mm, and a width of 25 mm is placed on top of the catalyst layer 12, and the upper opening surface of this catalyst layer 12 is covered with an 8 mesh stainless steel plate with a diameter of 120 mm. Net 13
covered by Here, the two plates of stainless steel mesh 10 and 13 and the SUS304 plate 11 are fixed by electrical welding.

In the above configuration, combustion gas from the combustion tube 3,
Alternatively, the petroleum evaporated component 14 is supplied to the catalyst layer 12 by oxygen 15 from the atmosphere being supplied by natural convection.
During this time, the bad odor is removed and the gas 16 passes through the openings in the ceiling plate 2.

Figure 3 shows the same catalyst layer 12 in the same location as Figure 2.
In this case, a fixing hole 17 is provided in the upper part of the combustion tube 3, and the catalyst layer 1 is inserted into this hole 17.
A metal rod 18 for supporting the combustion tube 2 is passed through the combustion chamber 2, one end of the combustion tube 3 and the metal rod 18 are fixed, and a catalyst layer 12 is installed at the other end so as to be located directly above the combustion tube 3. , the same effect as in the case of FIG. 2 was obtained.

FIG. 4 shows an embodiment in which a catalyst layer 19 is installed on the ceiling plate 2. In this case, a hole having the same diameter as the combustion tube 3 is provided in the ceiling plate 2 so that the center of the combustion tube 3 coincides with the center of the hole.

Note that the diameter of this hole is 120 mm. A catalyst layer 19 with a diameter of 130 mm and a thickness of 20 mm is installed below the hole in the ceiling plate 2, supported by an 8 mesh stainless steel mesh 20 and a 0.5 mm thick stainless steel plate 21 made of SUS304. In addition, above the hole in the ceiling plate 2, a circular plate 22 with a diameter of 140 mm is placed at a position of 135 mm in diameter.
The upper part of the catalyst layer 19 is protected by being fixed to the ceiling plate 2 with support rods 23 at three positions at 0°, 120°, and 240° such that the distance from the disc 22 is 15 mm.

In this embodiment, the distance between the catalyst layer 19 and the combustion tube 3 is longer than that in FIGS. 2 and 3, but the size of the catalyst layer 19 is increased, which makes
The same effect as in the case shown in the figure was obtained.

FIG. 5 shows an embodiment in which an auxiliary ceiling plate 25 and a catalyst layer 19 are fixed 40 mm below the ceiling plate 2 by a support rod 24. The auxiliary ceiling plate 25 has a combustion tube 3
A hole with a diameter of 120 mm is made so that the center of the hole coincides with the center of the hole.

Then, a stainless steel ring 26 with a diameter of 130 mm, a plate thickness of 0.5 mm, and a height of 20 mm is placed on the top of this hole so that the center is the same as the hole, and an 8 mesh stainless steel mesh 27 is placed so as to be inscribed in this stainless steel ring 26. It is located above the hole. In this case, the stainless steel ring 26, the stainless steel net 27 and the auxiliary ceiling plate 25
It is fixed by welding. In addition, the catalyst layer 19
is manufactured to have a diameter of 125 mm and a height of 20 mm, and is installed inside the stainless steel ring 26 and on the stainless steel mesh 27. Thereby, in the case of FIG. 5, the catalyst position can be brought closer to the combustion tube 3 compared to FIG.

In addition to the configuration shown in FIG. 4, FIG.
This is an embodiment in which a guide plate 28 is provided at an angle of 10 degrees with respect to the horizontal line.

In each of the above examples, it was confirmed through experiments that the position of the catalyst layers 12 and 19 from the combustion tube 3 is preferably 20 mm or more at the closest position. This is catalyst layer 1
2 and 19 closer to the combustion tube 3 by more than the above value, the exhaust resistance becomes large and natural convection of oxygen is no longer carried out, and the combustion condition of the combustion tube 3 is greatly affected. be. In addition, the furthest distance from the combustion tube 3 of the catalyst layers 12, 19 is the height of the catalyst layers 12, 19, the distance from the combustion tube 3 to the ceiling plate 2 in a normal oil stove is 170 mm, and the distance between the catalyst layers 12, 19 Approximately 150mm is preferable to not changing the shape of the stove.

In addition, the height of the catalyst layers 12 and 19 should be set at 5 mm to 40 mm so that the catalyst layer 12 and 19 will not be too low to reduce their effectiveness as catalysts, or too high to increase exhaust resistance.
It is desirable to set it in the range of mm.

Furthermore, the planar area of the catalyst layers 12 and 19 is the catalyst efficiency,
From the viewpoint of appearance and practicality, 50% or more of the flat area of the combustion tube
Experiments have confirmed that a range of 300% is preferable.

Here, an example of the structure of the catalyst layers 12 and 19 is shown in FIGS. 7a and 7b. In this case, the catalyst has a diameter of 6 to
A glass cloth made of 7μ glass fibers woven into a woven fabric is immersed in heated strong acid for dealkalization treatment to extract the alkaline component, resulting in a silica component ratio of over 95%. , and heat resistance 1000
After obtaining a silica cloth heated to above ℃ and depositing 15% by weight of silica and alumina on the surface of this silica cloth to form a catalyst carrier, a silica cloth catalyst 41 carrying 1.0% by weight of platinum, which is a catalyst metal, was prepared. Using. On the other hand, as shown in Figure 7a, the wire diameter is 0.3 mm.
20mesh stainless steel mesh 40 knitted with SUS304 wire
was previously processed into a wave shape with a wavelength of 10 mm and an amplitude of 6 mm, and then overlapped with the silica cloth catalyst 41 and simultaneously wound with the stainless steel net 40 on the outside to form a spiral shape as shown in FIG. 7b. At this time, the width of both the stainless aluminum and silica cloth catalysts was 20 mm. Generally, the pressure loss of the catalyst layer and the catalyst filling rate are determined by the width of the stainless steel mesh 40.

As explained above, according to the present invention, carbon monoxide and hydrocarbons can be removed, for example, by providing a catalyst layer above the combustion tube of an oil stove for purifying exhaust gas and oil vaporized components. This allows the exhaust gas to be released into the same space as the combustor. In this case, since it can be attached to a ready-made product, bad odors can be reliably removed without significantly changing the external shape of the kerosene stove. Of course, the present invention is not limited to kerosene stoves, but can also be applied to other stoves, such as gas stoves.

Furthermore, since the catalyst layer is installed outside the combustion tube, it hardly affects the combustion tube (combustion section).

In addition, when the catalyst layer in each of the above examples was attached to a commercially available reflective kerosene stove and an olfaction test was conducted, it was found that the odor was quite strong when the catalyst layer was not attached, but it was slightly odorless when the catalyst layer was attached. The result was that the odor was removed to the extent that it smelled. On the other hand, as a result of a 10-minute combustion test for hydrocarbons and carbon monoxide by placing a kerosene stove in a 1 m ³ container, the results showed that both hydrocarbons and carbon monoxide were lower than when no catalyst layer was installed. A purification rate of over 50% was obtained. Furthermore, the present invention is not limited to the dimensions and shapes of the equipment used in each of the above examples, and in addition to silica and alumina, inorganic materials such as zirconia are used to form a support for the silica cloth catalyst. It can be used as a mixture, and as a catalyst metal, in addition to platinum, noble metals such as rhodium, ruthenium, palladium, osmium, etc., and metals or metal oxides such as copper, iron, chromium, cobalt, nickel, etc. can be used singly or as a mixture. It is possible to use

[Brief explanation of the drawing]

FIG. 1 is a front view showing a schematic configuration of a general kerosene stove, FIG. 2 is a schematic configuration diagram showing an example in which a combustion device according to an embodiment of the present invention is applied to the same kerosene stove, and FIGS. 5 and 6 are views showing other embodiments of the present invention, and FIGS. 7a and 7b are views showing an example of the structure of the catalyst layer. 2... Ceiling plate, 3... Combustion tube, 10, 13...
Stainless steel mesh, 11... cylindrical plate, 12... catalyst layer.

Claims (1)

[Claims] 1. It has a horizontal cross-sectional area of 50% to 300% of the horizontal cross-sectional area of the combustion tube in the space 20mm to 150mm above the combustion tube, and is processed into a wave shape with a flat cross catalyst and has heat resistance. A combustion device characterized by disposing a catalyst device formed by overlapping metal nets and winding the two in a spiral shape.