JPH02171501A - Combustion device - Google Patents

Abstract

PURPOSE:To reduce an amount of discharged CO by a method wherein unburnt gas is re-introduced in a combustion chamber by means of air fed to a restriction area to burn the unburnt gas, and the unburnt gas diffused to an air introduction passage through a vent hole is oxidized by means of a catalyst body. CONSTITUTION:During high combustion, unburnt gas and air are burnt in a well mixed state with high efficiency in a range of from a position in the vicinity of the upper end of an inner flame cylinder 6 to a position in the vicinity of the upper end part of a combustion chamber 8. The unburnt gas is burnt by means of flame fr formed above the unburnt gas. By reducing an unburnt gas amount through reduction of the exposure height of a wick 1, flame is lowered in the combustion chamber 8. Gasified gas is reduced and an unburnt gas amount is also reduced, a region of mixture with an air flow is lowered downward, and flame fs is formed in the combustion chamber 8. Most of the unburnt gas flowing in a restriction area 22 is fed in the combustion chamber 8 by means of an air flow and burnt by means of the flame fs, but a part of the unburnt gas is diffused through a vent hole 24 to an air introduction passage 25. Since an oxidizing catalyst body 27 is arranged in the introduction passage 25 above the vent hole 24, diffused CO passes through the catalyst body 27 for oxidation, and the oxidized CO rises in the air introduction passage 25, and an amount of CO discharged in the open air is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a combustion device used for home heating and the like.

2. Description of the Related Art Conventionally, as a combustion device of this type, there has been a suction vaporization type combustion device used in oil stoves, etc., and this is generally of the type shown in FIG. In FIG. 3, reference numeral 1 denotes a lamp wick, which is set between an inner wick tube 2 and an outer wick tube 3 so as to be vertically movable.

The upper ends of the inner core tube 2 and the outer core tube 3 form an inner flame tray 4 and an outer flame tray 5, respectively, on which an inner flame tube 6 and an outer flame tube 7 are placed. During combustion, the tip of the wick 1 is exposed in a combustion chamber 8 formed between an inner flame tube 6 and an outer flame tube 7, where the fuel is vaporized. Reference numeral 9 denotes an outer cylinder, and the inner flame cylinder 6, outer flame cylinder 7, and outer cylinder 9 are arranged approximately concentrically in order from the inside, and are integrated by a fixing pin 10. Reference numeral 11 indicates a large number of air holes provided in the inner flame tube 6 and the outer flame tube 7. Reference numeral 12 denotes an inner flame tube top plate that closes the upper end opening of the inner flame tube 6, and has an air hole 13 communicating upward from the inside of the inner flame tube 6. 14 is a flame expansion plate placed on the top plate 12 of the inner flame tube. At the upper end of the outer cylinder 9 there is a constriction part 15.
A red-hot part 16 is formed in the outer flame tube 7 above the constricted part 15, and a large through hole 17 is provided. 18 is a transmission tube made of a transparent material such as glass;
It is placed on the outer cylinder 9.

A top frame 19 is placed on the upper end of the incandescent part 16 so as to close the upper end of the air passage 20 between the incandescent part 16 and the i3 tube 18, and fixes the transmission cylinder 18. In the above configuration, when the lamp wick 1 is ignited, combustion starts, and the high-temperature combustion gas generated by combustion rises in the combustion chamber 8, creating a thermal draft, and the air necessary for combustion is transferred to the inner flame tube 6 and the outer flame tube 7. Air is supplied into the combustion chamber 8 from the air hole 11 of the
A secondary flame f1 is formed above the outer flame tube 7, and the unburned components rising in the combustion chamber 8 are almost completely combusted, resulting in good exhaust gas characteristics.However, the exposed height of the wick l is lowered. When the amount of combustion is reduced by doing so, the flame descends into the combustion chamber 8 and is formed as shown at f2. Conventionally, under such conditions, the exhaust gas characteristics, especially Co/Co□, deteriorated rapidly.
As a result of measuring the exhaust gas inside the combustion device, it became clear that the main cause of the above phenomenon was the flow inside the inner flame tube 6. As a result of measuring the CO distribution in the height direction of the A-A'' line (inside the inner flame cylinder 6) of the combustion apparatus shown in FIG. 4, it was found that a very high value of more than loooppm was observed near the upper end even during weak combustion.

During strong combustion, the combustion is almost complete with flame f1, so the exhaust gas characteristics are good, but during weak combustion, the flame descends into the combustion chamber 8, so these high concentrations of CO pass through the flame zone. From the above, it is clear that there is a flow like the one in (a) in which unburned gas leaks from the combustion chamber 8 to the inside of the inner flame tube 6. The unburned gas containing this high concentration of CO is directly released into the atmosphere from the air holes 13 and the air holes 11 above the flame r2, and the co/cot characteristic deteriorates rapidly. Therefore, the combustion amount could only be adjusted within the range where the flame r2 was formed above the combustion chamber 8.

Therefore, as an example of means for improving the above-mentioned drawbacks, a method as shown in FIG. 4 has been proposed.

In Fig. 4, only the points different from the above conventional example will be explained.
Reference numeral 21 denotes a flow control tube installed inside the inner flame tube 6, and forms a flow control region 22 between it and the inner flame tube 6. 23 is a plate installed horizontally in the control area. Reference numeral 24 designates a ventilation hole provided on the wall surface of the flow restriction tube below the plate portion 23, and 25 represents an air introduction path formed inside the flow restriction tube 21. 26 is a ventilation part having a constant interval between the flow control tube 21 and the inner flame tube top plate 12. With the configuration of 6 or more,
The flow control tube 21 prevents unburned gas from flowing into the air introduction passage 25, and the air (white arrow) supplied to the control region 22 from the upper part of the ventilation section 26 and the vent hole 24 prevents unburned gas from flowing into the control region 22. Since the combustion gas is reintroduced into the combustion chamber 8 (black arrow) and combusted, Co/Co during weak combustion! We were able to significantly improve the characteristics.

Problems to be Solved by the Invention However, in the above-described configuration, the unburned gas containing a large amount of CO that has flowed into the control area 22 is not completely reintroduced into the combustion chamber 8 and combusted, and some of it remains as indicated by the dashed arrow. Like ventilation hole 2
4 diffuses into the air introduction path 25.

Furthermore, as the amount of combustion is reduced, the draft force within the combustion chamber 8 is reduced, so the proportion of CO that diffuses from the vent hole 24 to the air introduction path also increases. Therefore, when the combustion amount is reduced and the flame descends into the combustion chamber 8, the diffused CO rises up the air introduction passage 25 and is directly released into the atmosphere from the air holes 11 and stomata 13 above the flame f2, resulting in Co/co, Characteristics gradually deteriorate. Therefore, although the Go/CO2 characteristics were significantly improved with the configuration shown in FIG. 5, they were not fully satisfactory.

Means for Solving the Problems In order to solve the above problems, the combustion apparatus of the present invention includes: a fluid control area forming a control area between the inner flame body; a plate section disposed horizontally in at least one stage in the control area; A vent hole is provided in the flow control tube below the plate, and at least one stage of oxidizing catalyst is set above the vent hole in an air introduction passage formed inside the flow control cylinder.

Effect of the present invention With the above-described configuration, the flow control prevents unburned gas from flowing into the air introduction passage, and the air supplied to the control area from the ventilation part or the vent hole prevents the unburned gas flowing into the control area. The unburned gas is reintroduced into the combustion chamber and burned, and the unburned gas that diffuses from the vent to the air introduction path is oxidized by an oxidizing catalyst, so it rises up the air introduction path and is released into the atmosphere from above the control area. The amount of CO is significantly reduced.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. Here, a commonly used cylindrical combustion device will be explained.

In Fig. 1, l is the wick which is the fuel supply part, and the wick inner cylinder 2
and the core outer cylinder 3 so as to be vertically movable. The upper ends of the inner core tube 2 and the outer core tube 3 form an inner flame tray 4 and an outer flame tray 5, respectively, and an inner flame tube 6 as an inner flame body and an outer flame tube 7 as an outer flame body are mounted, respectively. has been done. During combustion, the tip of the wick 1 is exposed in a combustion chamber 8 formed between an inner flame tube 6 and an outer flame tube 7, where the fuel is vaporized. Reference numeral 9 denotes an outer cylinder, which is an outer body, and the inner flame cylinder 6, outer flame cylinder 7, and outer cylinder 9 are arranged approximately concentrically in order from the inside and are integrated by a fixing pin IO. Reference numeral 11 indicates a large number of air holes provided in the inner flame tube 6 and the outer flame tube 7. Reference numeral 12 denotes an inner flame tube top plate that closes the upper end opening of the inner flame tube 6, and has an air hole 13 communicating upward from the inside of the inner flame tube 6. 14 is a flame expansion plate placed on the top plate 12 of the inner flame tube. A constriction part 15 is formed at the upper end of the outer cylinder 9, and a glowing part 16 is formed in the outer flame cylinder 7 above the constriction part 15, and a through hole 17 with a large opening is provided. 1
The transparent tube is made of a transparent material such as glass, and is placed on the outer tube 9. 19 is the top frame and red hot part 1
It is placed on the upper end of the glowing part 16 so as to close the upper end of the air passage 20 between the transmission tube 6 and the transmission tube 18, and fixes the transmission tube 18. Reference numeral 21 denotes a flow control tube installed inside the inner flame tube 6, which extends upward from near a position facing the tip of the wick 1, and forms a control area 22 between it and the inner flame tube 6. Reference numeral 23 denotes a plate section installed horizontally in the control area 22. Reference numeral 24 indicates a ventilation hole provided on the wall surface of the flow control tube 21 below the plate portion 23, and 25 indicates the flow control tube 2.
1 is an air introduction path formed inside.

Reference numeral 26 is a ventilation section that is set to have a constant interval between the flow control tube 21 and the inner flame tube top plate 12. 27 is ventilation hole 2
This is an oxidizing catalyst body set in the air introduction path 25 above 4.

In the above configuration, when the lamp wick 1 is ignited, combustion starts, and high temperature combustion gas due to combustion rises in the combustion chamber 8, creating a thermal draft, and the air necessary for combustion is transferred to the inner flame tube 6 and the outer flame tube 7. The fuel is supplied into the combustion chamber 8 through the hole 11 and the through hole 17 of the red-hot part 16, and combustion continues. Air supplied from inside the inner flame tube 6 is divided into a flow shown by a white arrow (a), which is supplied from below the flow control tube 21 to the vicinity of the lamp wick 1, and a flow shown by a white arrow (b), which ascends through the air introduction path 25. A part of the rising air passes through the vent hole 24 as indicated by the white arrow <c> and is supplied to the combustion chamber 8. Furthermore, the air supplied above the inner flame cylinder 6 passes through the ventilation part 26 as shown by the white arrow (d), and then passes through the air holes 11 and the air holes 1.
3 to the combustion chamber 8 and above. A part of the air also descends to the control area 22 as shown by the white arrow (e), and is also supplied to the combustion chamber 8 from the air holes 11 located relatively below. On the other hand, the fuel vaporized by the air flow white arrow (a) becomes a mixed gas with air and mainly moves into the combustion chamber 8 as shown by the black arrow Cr).
However, a part of this unburned gas flows into the control area 22 as shown by the black arrow (g) due to diffusion. This unburned gas flows through the vent hole 24 and the vent section 32 as indicated by the white arrow (c).
(d).

(e) and is again supplied to the combustion chamber 8 as shown by the black arrow (h). Therefore, during strong twist firing, unburned gas and air are mixed well from near the upper end of the inner flame tube 6 into the combustion chamber 8.
It is efficiently combusted near the upper end, and unburned gas that is not completely combusted here is combusted by the flame fr formed above. Next, when the exposed height of the lamp wick 1 is lowered to reduce the amount of combustion, the flame gradually descends into the combustion chamber 8.

The flow in this case is the same as that during strong twist firing, but since the amount of vaporized gas is reduced, the amount of unburned gas flowing into the control area 22 is also reduced. Therefore, the mixing region with the air flow white arrow (6) moves downward, forming a flame f3 in the combustion chamber 8. In this case, the unburned gas flowing into the control area 22 is shown by the air flow white arrow (d).
, (e), most of the gas is supplied into the combustion chamber 8 and burned by the flame rs, but some of the unburned gas is shown by the dashed arrow (1).
The air diffuses into the air introduction path 25 through the ventilation hole 24 as shown in FIG. Furthermore, when the combustion amount is reduced, the draft force within the combustion chamber 8 is reduced, so that the proportion of CO that diffuses into the air introduction passage 25 through the vent hole 24 gradually increases. However, in this embodiment, since the oxidizing catalyst body 27 is set in the air introduction passage 25 above the vent hole 24, the diffused co passes through the catalyst body 27, is oxidized, and moves up the air introduction passage 25.

Therefore, even if the combustion amount is reduced, CO will be released directly into the atmosphere from the air holes 11 and 13 above the flame Is.
Since the CO/CO characteristics are significantly reduced, the CO/CO characteristics do not deteriorate.

Figure 2 shows C vs. combustion amount for the combustion device of this example.
This is the result of measuring o/00g. For reference, the results for the conventional example shown in FIG. 3 (Conventional Example 1) and the conventional example shown in FIG. 4 (Conventional Example 2) are also shown, but this example shows better characteristics than the conventional example. In this embodiment, a cylindrical combustion device was explained, but it may be a flat or other shape.Furthermore, it is applicable not only to a combustion device using liquid fuel but also to a combustion device using gaseous fuel. It is also applicable to

Effects of the Invention As described above, according to the combustion apparatus of the present invention, there is provided a fluid control area that forms a control area between the inner flame body, a plate section provided horizontally in at least one stage in this control area, and a lower part of the plate. A vent hole is provided in the flow restriction tube, and at least one stage of oxidizing catalyst is set above the flow restriction tube in the air introduction path formed inside the flow restriction tube. In addition to preventing unburned gas from flowing out, the unburned gas that has flowed into the control area is reintroduced into the combustion chamber by air supplied to the control area from above the ventilation part or from the vent to burn it, and air is introduced from the vent. Since the CO diffused into the road is oxidized and the CO emitted directly into the atmosphere is significantly reduced, a safe and comfortable combustion device with good combustion characteristics and a wide range of combustion amount adjustment can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts of a fuel/mine equipment according to an embodiment of the present invention;
FIG. 2 is a characteristic diagram showing the effects of the same device, FIG. 3 is a sectional view of a main part of a conventional combustion device, and FIG. 4 is a sectional view of a main part of another conventional example. 1...Fuel supply section, 6...Inner flame body, 7
...Outer flame body, 8...Combustion chamber, 9...
...Outer body, 11...Air hole, 21...
・Fluid control area, 22... Control area, 23...
Plate portion, 24...Vent hole, 26...Air introduction path, 27...Catalyst body. 6-・・ 7-・ 8-・ n −・ Da family doubling internal exchange external exudation inflammation body Shigeru 嘗外体空气口Fig.

Claims (1)

[Claims] an outer flame body having a large number of air holes, an inner flame body having a large number of air holes arranged inside the outer flame body, an outer body located outside the outer flame body, and the outer flame body. a fuel supply section set at the lower end of the combustion chamber formed between the inner flame body and the inner flame body; and a fluid control section disposed inside the inner flame body to form a control area between the inner flame body and the inner flame body. , a plate section horizontally disposed in at least one step in the control area; a vent provided in the wall surface of the flow control tube below the plate; and an air introduction passage formed inside the flow control tube above the vent hole. and an oxidizing catalyst body set in at least one stage.