JPH0146762B2 - - Google Patents

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.

BACKGROUND ART Conventionally, as this type of combustion device, there is a suction vaporization type combustion device used in kerosene stoves, etc., but as shown in FIG. The tip of the wick 1 is exposed in the combustion chamber 8 formed between the tube 6 and the outer flame tube 7 to vaporize and burn the fuel. Normally, the outer flame cylinder 7 forms a red-hot part 16 having a through hole 17 with a large opening area above the throttle part 15 of the outer cylinder 9, and the fuel vaporized from the lamp wick 1 is combusted in the combustion chamber 8. ,
The red-hot part 16 was made red hot to obtain radiant heat.

Problems to be Solved by the Invention However, the above configuration has caused the following problems.

In normal strong combustion, as shown in Fig. 5, a secondary flame _f1 is formed above the inner flame tube 6 and the outer flame tube 7, and the unburnt components rising inside the combustion chamber 8 are completely combusted. Shows good exhaust gas characteristics. However, when the exposed height of the lamp wick 1 is lowered to reduce the amount of combustion, the flame descends into the combustion chamber 8 and is formed as shown at _f2 . In this case, the flame f ₃ that was formed in the air hole 11 and the through hole 17 of the inner flame tube 6 is no longer formed above the flame f ₂ . Conventionally, under such conditions, exhaust gas characteristics, especially CO/CO ₂ characteristics, have deteriorated rapidly. It has become clear that this is caused by the flow of combustion gas and air between the transmission tube 18 and the red-hot section 16 and inside the inner flame tube 6, as shown below.

FIG. 6 shows the conventional combustion device shown in FIG.
The CO distribution in the height direction is strengthened at the position of the air passage 20) and the line B-B' (i.e., inside the inner flame tube 6).
These are the results measured during weak combustion. At the position A-A', the CO concentration increases rapidly above the constricted part 15 of the outer cylinder 9 during strong combustion, reaches a maximum in the middle upper part, and decreases again near the upper end, but shows a high value of 500 ppm or more. However, during strong combustion, the flame f ₁ burns almost completely, resulting in good exhaust gas characteristics. A similar behavior is observed during weak combustion, but the CO concentration decreases near the top.
The amount is about 250 ppm, but in this case, since the flame becomes f ₂ and descends downward, it is emitted directly into the atmosphere from the through hole 17 near the upper end of the red-hot part 16. B
At the position of the −B′ line, the behavior is the same in both strong and weak combustion, and near the top, even in weak combustion.
It shows a very high value of over 1000ppm, and this is directly emitted into the atmosphere.

From the above results, the flow of air and combustion gas within the combustion device is as follows. That is, as shown in FIG. 5, there are main flows indicated by black arrows and flows indicated by broken line arrows. That is, the flow of incompletely combusted exhaust gas leaks from the combustion chamber 8 to the air passage 20, and the flow leaks from the combustion chamber 8 into the inner flame tube 6. Therefore, during weak combustion, if the flame falls into the combustion chamber 8 like f ₂ and no flame is formed above it, red heat will be emitted from the air hole 11 and the ventilation hole 13 at the upper part of the inner flame cylinder 6. Part 16
Combustion gas containing a high concentration of CO is directly released into the atmosphere from the upper through hole 17. This rapid deterioration of CO/CO ₂ during weak combustion is caused by
It has become clear that this is because combustion gas containing a high concentration of CO leaking into the inner flame tube 6 and into the air passage 20 is directly released into the atmosphere.

The present invention solves such conventional problems,
The object of the present invention is to obtain a combustion device with good combustion characteristics and a wide range of combustion amount adjustment by suppressing sudden deterioration of combustion characteristics during weak combustion.

Means for Solving the Problems In order to solve the above problems, the present invention provides an outer flame tube consisting of a vaporizing section having a large number of air holes and a red-hot section formed above the vaporizing section, and an inner flame tube of the outer flame tube. an inner flame tube having a large number of air holes arranged on one side, an outer tube located outside the outer flame tube, and a lower end of a combustion chamber formed between the outer flame tube and the inner flame tube. a flow control tube disposed inside the inner flame tube and forming a control area between the flow control tube and the inner flame tube, and a control area between the flow control tube and the inner flame tube. a plate section installed horizontally on the outer flame tube, and a plate section located inside the vaporizing section of the outer flame tube, extending from near the upper part of the fuel supply section to a position below the red-hot section of the outer flame tube, A combustion control tube is provided to form an air chamber between the combustion chamber and the combustion chamber.

Effect The present invention, with the above-described configuration, introduces unburned gas into the restriction region, mixes the unburned gas with clean air supplied above the restriction tube, and mixes the unburned gas near the upper end of the restriction tube. Air is intensively supplied to the combustion chamber from the air holes in the inner flame tube to promote combustion, and the inside of the upper end of the inner flame tube is kept in a clean state with few unburned gas components. To suppress the supply of air from the holes to the combustion chamber to prevent the formation of flame holding, suppress combustion within the combustion chamber, change the flow within the combustion chamber, and improve the combustion gas composition within the air passage. Can be done.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a lamp wick, which is a fuel supply section, and is set between an inner wick tube 2 and an outer tube 3 so as to be able to move up and down. 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,
An outer flame tube 7 is 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 a fixing pin 10
integrated by. Reference numeral 11 indicates a large number of air holes provided in the inner flame tube 6 and the outer flame tube 7. 12
is an inner flame tube top plate that closes the upper end opening of the inner flame tube 6, and has a ventilation 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 red-hot part 16 is formed in the outer flame cylinder 7 above the throttle part 15 of the outer cylinder 9, and a through hole 17 with a large opening is provided. Reference numeral 18 denotes a transparent tube made of a transparent material such as glass, and is placed inside the outer tube 9. A top frame 19 is placed on the upper end of the glowing part 16 so as to cover the upper end of the air passage 20 between the glowing part 16 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, and forms a flow control region 22 between it and the inner flame tube 6. A horizontal plate portion 21a is provided in the flow control area 22 between the flow control tube 21 and the inner flame tube 6. 23 is an air introduction path. Reference numeral 24 denotes a combustion control tube that is set inside the vaporization section 25 of the outer flame tube 7 below the red-hot section 16 of the outer flame tube 7, and extends from above near the wick 1 to a position below the red-hot section 16 of the outer flame tube 7. , the air chamber 2 is arranged so as to have a gap between it and the outer flame tube vaporizing section 25 located below the outer tube throttle section 15 in the outer flame tube 7.
6 is formed.

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 flows into the inner flame tube 6 and the outer flame tube 7. The air is supplied into the combustion chamber 8 through the air hole 11 and the through hole 17 of the red-hot section 16, and combustion continues, and during strong combustion, a flame fr is formed as shown in FIG. 2. The flow of combustion exhaust gas and air at this time will be explained separately into the inside of the inner flame tube 6 and the air passage 20 between the red-hot section 16 and the transmission tube 18. Air supplied from inside the inner flame tube 6 is divided into white arrow a, which is supplied from below the flow control tube 21 to the vicinity of the lamp wick 1, and white arrow b, which is upward in the air introduction path 23. The white arrow b reaches above the inner flame tube, and the air is supplied to the combustion chamber 8 and above through the air hole 11 and the ventilation hole 13 as shown by the white arrow c. In addition, some areas are controlled area 2 as shown by white arrow d.
The air is also supplied to the combustion chamber 8 from the air hole 11 located slightly downward toward the 2nd side and relatively lower. On the other hand, the fuel vaporized by the lamp wick 1, which is combusted by supplying the air indicated by the white arrow a from the air hole 11, becomes a mixed gas with air and rises in the combustion chamber 8 mainly as indicated by the white arrow e. However, due to the airflow white arrows c, d, and e, the control area 2
2, since the pressure becomes low, a part of the mixed gas flows from the air hole 11 into the control area 22 as shown by the black arrow f and rises. Therefore, the control area 22 is filled with unburned gas. This unburnt gas rises in the control area 22, mixes with the airflow white arrows c and d near the upper end of the flow control pipe 21 as shown by the black arrow g, and is returned to the combustion chamber 8 through the air hole 11. Therefore, during strong combustion, unburned gas and air are supplied near the upper end of the combustion chamber 8 in a well-mixed state near the upper end of the inner flame tube 8, so that the area A
It burns efficiently in the vicinity, forms a flame-holding state in this area, and becomes red-hot. Further, unburned gas that has not been completely combusted here is combusted by the flame fr formed above. Next, when the exposed height of the lamp wick 1 is lowered to achieve weak combustion, the flame gradually falls into the combustion chamber 8.
It becomes flame fs. The flow in this case is the same as that during strong combustion, but since the amount of vaporized gas is significantly reduced, the amount of unburned gas flowing into the control area 22 is also reduced. Therefore, the mixing area of the air flow with the white arrow d moves downward, and the area near area B becomes a good mixing area, forming a flame holding state in this area and making the wall of the inner flame tube 6 red hot.
The combustion is promoted and the flame fs formed above it completes the combustion.

Next, look at the flow in the air passage 20. Since the combustion control tube 24 is provided in the middle and upper part of the vaporization section 25 of the outer flame tube 7, the combustion chamber 8 is provided from the air hole 11 of the outer flame tube vaporization section 25.
There is no direct air supply to the In addition, since flame holding is not formed in the air hole 11 of the vaporization part 25 of the outer flame tube 7 located opposite the combustion control tube 24, combustion is not promoted, and the combustion load in the combustion chamber 8 is compared to the conventional example. When compared with the conventional example at the same combustion rate, the degree of fall in the flame fs is smaller, and therefore less unburned gas is released from the air passage 20 through the through hole 17 above the flame fs. , deterioration of CO/CO ₂ characteristics is suppressed. Furthermore, the combustion control tube 24
The leakage of combustion gas into the air passage 20 is suppressed by the flow restriction effect. In other words, if there is no combustion control tube 24 as in the conventional example, the combustion gas will flow through the combustion chamber 8.
Since the air rises using the entire width of the air, it leaks into the air passage 20 as soon as it reaches the red-hot part 16. However, in this embodiment, since the combustion control tube 24 is present, the flow of combustion gas is shifted toward the inner flame tube 6 by the width of the air chamber 26, and the combustion exhaust gas rising from below the combustion chamber 8 is Leakage into the air passage 20 is suppressed. Further, a certain amount of air supplied from the air hole 11 of the outer flame tube vaporization section 25 facing the combustion control tube 24 to the air chamber 26 as shown by the white arrow h is ejected from the outlet of the air chamber 26 into the combustion chamber 8. As it is mixed with vaporized gas, it burns here, forming a flame ft, and the combustion gas rises as shown by the black arrow h. Therefore, a layer of this combustion gas is formed near the inner wall of the red-hot section 16, which suppresses leakage of unburned gas (white arrow e) rising from below the combustion chamber 8 into the air passage 20. Since the layer of flow indicated by the black arrow h rises near the red-hot part 16, it naturally flows through the air passage 20 as indicated by the black arrow i.
However, the flow indicated by the black arrow i is from the air chamber 2.
The combustion gas is in a state where combustion has progressed considerably due to the flame ft formed at the exit of the air passage 20, and it contains a large amount of CO _{2 .} It does not lead to deterioration.

FIG. 3 shows CO at the positions of the A-A' line (inside the air passage 20), the C-C' line (inside the control area 22), and the D-D' line (air introduction path 23) in the embodiment shown in FIG. ,
These are the results of measuring the CO ₂ concentration distribution during weak combustion. For comparison, the value of the A-A' line position of the conventional example is also shown. At the A-A' line position, the value of CO was almost the same as that of the conventional example, but the example of the present invention showed a considerably higher value of _CO2 , and the CO/
This is consistent with the above explanation that it does not lead to deterioration of CO ₂ properties. At the C-C' line position, a very high concentration of CO is detected from the lower end of the flow control tube 21, but it gradually becomes thinner near the upper end of the flow control tube 21, and the inner flame tube 6
The CO concentration is quite low at the upper end, and it can be seen that the area above the inner flame tube 6 is in a clean state with a low CO concentration.
It can be seen that at the line D-D' inside the flow control tube 21, the CO concentration is low over the entire area, and clean air is being supplied. The above results are also consistent with the above explanation.

Figure 4 shows the combustion amount of this embodiment and the conventional example.
These are the results of measuring CO/CO ₂ characteristics. In the conventional example (broken line), CO/
The CO ₂ value has increased rapidly, and the exhaust gas characteristics have deteriorated, but in this example (example), even if the combustion amount is reduced, the CO/CO ₂ value remains low, indicating that the characteristics have been significantly improved. The effects of the present invention are clear. This effect is due to the synergistic effect of the configurations of the flow control tube 21 and the combustion control tube 24, and although it is effective even if only one of them is used, a large effect as described above cannot be expected. For reference, flow control tube 2 is shown in Figure 4.
The characteristics of A when only the combustion control cylinder 24 is used and the characteristics of B when only the combustion control tube 24 is used are also shown. The effects of the present invention are clear from this result as well.

Effects of the Invention As described above, the combustion apparatus of the present invention provides the following effects.

(1) By providing a flow control tube, the clean air in the air introduction path and the combustion gas introduced into the control zone are separated, and it is possible to supply clean air to the upper part of the inner flame tube, reducing CO/ CO ₂ properties are improved.

(2) Near the upper end of the control tube, a high concentration of CO is contained in order to form a good mixture of combustion gas and air at a certain height of the inner flame tube depending on the amount of combustion, and to promote combustion. No combustion gas escapes,
CO/CO ₂ characteristics can be reduced.

(3) The flow of combustion gas upward into the inner flame cylinder is suppressed by the clean air flow supplied above the inner flame cylinder from the air introduction passage, and as a result, the upper interior of the inner flame cylinder contains almost no combustion gas. Therefore, even if the flame falls into the combustion chamber during weak combustion, high concentrations of CO will not be released directly into the atmosphere, reducing CO/CO ₂ emissions.

(4) The combustion control tube reduces the combustion load in the combustion chamber, suppressing the fall of the flame during weak combustion, and suppressing the combustion gas released into the atmosphere from the air passage above the red-hot part, thereby reducing CO2. /
CO ₂ can be reduced.

(5) The flow control effect of the combustion control tube suppresses the flow of combustion gas rising from the lower part of the combustion chamber into the air passage, suppressing the deterioration of CO/CO ₂ .

(6) Air ejected from the air chamber to the combustion chamber promotes combustion near the inner wall of the red-hot section, forming a layer of combustion gas containing a large amount of CO ₂ , creating an air path for unburned gas that rises from the bottom of the combustion chamber. control the outflow to CO and reduce the deterioration of CO/CO ₂ .

(7) The exhaust gas layer formed near the inner wall of the red-hot part is CO ₂
Even if it flows into the air passage and is released into the atmosphere from the upper part of the red-hot part, _CO
Does not lead to rapid deterioration of characteristics.

With the above effects, by suppressing the rapid deterioration of combustion characteristics when the combustion amount is reduced, it is possible to obtain a combustion device with good combustion characteristics and a wide range of combustion amount adjustment.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main parts of a combustion device according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the flow inside the combustion device, and Figs. 3 and 4 are for explaining the effects of the combustion device. FIG. 5 is a sectional view of a main part of a conventional combustion device, and FIG. 6 is a characteristic diagram of a conventional combustion device. 1...Light wick, 6...Inner flame tube, 7...Outer flame tube, 8
... Combustion chamber, 9 ... Outer cylinder, 11 ... Air hole, 16
... Red hot part, 21 ... Control cylinder, 22 ... Control area,
24... Combustion control tube, 25... Vaporization section, 26...
air chamber.

Claims (1)

[Claims] 1. An outer flame tube consisting of a vaporizing section having a large number of air holes and a red-hot section formed above the vaporizing section, an inner flame tube having a large number of air holes arranged inside the outer flame tube, and an inner flame tube having a large number of air holes arranged inside the outer flame tube. an outer cylinder located outside the flame cylinder, a fuel supply part set at the lower end of the combustion chamber formed between the outer flame cylinder and the inner flame cylinder, and arranged inside the inner flame cylinder, A flow control tube that forms a control area between the inner flame tube and the inner flame tube, a plate section installed horizontally in the control area between the flow control tube and the inner flame tube, and an inner part of the vaporization section of the outer flame tube. a combustion control tube extending from near above the fuel supply section to a position below the red-hot section of the outer flame tube and forming an air chamber between it and the vaporizing section of the outer flame tube; Device.