JPS62155423A - Combustion device - Google Patents

Abstract

PURPOSE:To prevent the sudden deterioration of combustion characteristics upon weak combustion and obtain a combustion device, good in the combustion characteristics and large in the control range of the amount of combustion, by a method wherein a flow control body, shielding a flow control area at a bottom surface, is provided and a flow control panel, having the same size as or a somewhat larger size than that of the flow control body, is provided horizontally above the flow control body through a small clearance. CONSTITUTION:Clean air is introduced into a flow control area 22 by the effect of a flow control panel 24 to a considerably lower part as shown by white arrow signs (d) and the clean air is mixed with unburnt gas which flows into the flow control area 22 as shown by black arrow signs (f) to supply it into a combustion chamber 8 through the air ports 11 of an inner flame tube 6 as shown by the black arrow signs (g) and burn it over the wide range of the inner flame tube 6, therefore, combustion is effected without losing an air balance between the side of the inner lame tube 6 and the side of an outer flame tube 7 whereby a red heat part 16 obtains a good red-heat condition upon strong combustion. Subsequently, when the exposing height of a wick 1 is lowered to make the combustion weak, flames drop gradually into the combustion chamber 8 and become the flame (fs) while the amount of evaporated gas is reduced remarkably, therefore, the amount of unburnt gas, flowing into the flow control area 22, is reduced. Accordingly, the wall surface of the inner flame tube 6 is red-heated to promote the combustion and the combustion is completed with the flame (fs).

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 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, which is a fuel supply section, is exposed in a combustion chamber 8 formed between an inner flame tube 6, which is a body, and an outer flame tube 7, which is an outer flame body, and the fuel ft is vaporized and burned. 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 a9, which is the outer body, and the fuel vaporized from the lamp wick 1 and the through hole 17 are formed. The air introduced into the combustion chamber 8 was mixed and combusted to generate a red-hot section of 16 feet, producing 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 Figure 7, the inner flame tube 6 and the outer flame tube 7
A secondary flame f1 is formed between the combustion chambers θ and the unburned components rising inside the combustion chamber θ are completely combusted, so that good characteristics are exhibited. 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 f3 that was formed in the air hole 11 and the through hole 17 of the inner flame cylinder is no longer formed above the flame f2.

Conventionally, under such conditions, the exhaust gas characteristics, especially Co/CO
2 was rapidly deteriorating. The cause of this was not clear until now, but the results shown below have revealed that the main cause is the air flow inside the inner flame cylinder 6.

FIG. 6 shows the A-A' line (i.e., the air passage 20 between the outer cylinder a9 or b18 and the outer flame cylinder 7) and the B-B' line (i.e., the inner flame cylinder 6) of the conventional combustion device shown in FIG. This is the result of measuring the distribution of Co in the height direction at the position (inside) during strong and weak combustion. At the position of the A-A' line, during strong twist firing, the CO concentration increases rapidly above the constriction part 15 of the outer cylinder a9, reaches the maximum in the middle upper part, and decreases again near the upper end, but reaches a high value of 500 ppm or more. show. However, during strong twist firing, the flame f1 burns almost completely, resulting in good exhaust gas characteristics. A similar behavior occurs during weak combustion, but the CO concentration is low, around 250 ppm near the top. At the position of the B-B line, the behavior is the same in both strong twist firing and weak combustion, and the upper part is CO2.
The concentration increases, reaching 11,000p near the top even during weak combustion.
It shows a very high value of P.

From the above results, the flow of air and exhaust gas within the combustion device is as follows. That is, as shown in FIG. 5, the main flow is indicated by the black arrow, but in addition there are flows as indicated by the broken line arrow. In other words, a flow a in which incompletely combusted exhaust gas leaks from the combustion chamber 8 into the air passage 20, and
A flow b leaks from the inside of the inner flame cylinder 6. Of these, the flow easily re-enters the combustion chamber 8 because the aperture ratio of the through holes 17 of the red-hot part 16 is large, and it is burned by the flame f2, so during weak combustion, the CO value near the north end of the outer flame tube is low. shows. However, since the air holes 11 of the inner flame tube 6 are small and the resistance is large, the flow b does not flow back into the combustion chamber 8. Even during weak combustion, CO is high near the end of the inner flame tube 6J. shows.

Therefore, during weak combustion, if the flame falls into the combustion chamber B like f2 and no flame is formed above it, a high concentration of Co will be contained from the air holes 11 and vent holes 13 at the top of the inner flame fgi+ 6. Exhaust gases will be released directly into the atmosphere. It has become clear that the main reason for the rapid deterioration of Co/CO2 during weak combustion is that the exhaust gas containing high concentration of CO leaking into the inner flame tube 6 is directly released into the atmosphere. Ta.

Therefore, to improve Co/CO2'z during weak combustion,
It is necessary to prevent exhaust gas containing a high concentration of Coft from being directly released into the atmosphere. For this purpose, the height of the combustion chamber 8 is lowered, the combustion load within the combustion chamber 8 is reduced, and the amount of combustion is reduced. Even when the combustion chamber is made small, flame is formed above the combustion chamber 8.

However, in this case, the area of the red-hot part 16 is smaller υ
There were problems such as low red-hot temperature during strong twist firing, resulting in uneven red-hot color. Furthermore, if the combustion ifc is further reduced, the flame will eventually fall into the combustion chamber 8, the above-mentioned phenomenon will occur, and the Co/CO2 characteristics will deteriorate.

The present invention solves such conventional problems, and provides a combustion device with good combustion characteristics and a wide range of combustion amount adjustment by suppressing the rapid deterioration of combustion characteristics during weak combustion. With the goal.

Means for Solving All Problems In order to solve the above-mentioned problems, the combustion apparatus of the present invention has a combustion device extending inside the inner flame from near a position facing the fuel supply section to a position below the upper end of the inner flame, In addition, a fluid control plate is provided that blocks the flow control area formed between the inner flame body and the inner flame body with its bottom surface, and a flow control plate that is approximately the same as or slightly larger than the fluid control plate is installed above the fluid control plate with a slight gap in the horizontal direction. It is set up in

Function The present invention has the above-described configuration, which prevents unburned gas from flowing into the air introduction passage, keeps the upper part of the inner flame cylinder in a clean state containing almost no CO, and also introduces air from the air introduction passage into the control area. By mixing it with unburnt gas and supplying it to the combustion chamber through the air hole of the inner flame body and burning it efficiently, combustion can be carried out without disturbing the air balance between the inner flame body side and the outer flame body side.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In Fig. 1, 1 is a cylindrical cylinder core which is a fuel supply part, and is set so as to be freely movable northward between an inner core cylinder 2 which is an inner core body and an outer core cylinder 3 which is an outer core body. . 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 as an inner flame body and an outer flame tube 7 as an outer flame body are placed. Tebru. The tip of the wick 1 is connected to the inner flame tube 6 and the outer flame tube 7 during combustion.
It is exposed in the combustion chamber 8 formed between them, and the fuel is vaporized here. 9 is an outer cylinder a which is an outer body a, and an inner flame cylinder 6
, the outer flame cylinder 7, and the outer cylinder a9 are arranged in a substantially concentric circle 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 north end opening of the inner flame tube 6, and has a ventilation hole 13 communicating from the inside of the inner flame tube 6 downward. 14 is a flame expansion plate placed on the top plate 12 of the inner flame tube. The outer flame cylinder 7 above the throttle part 15 of the outer cylinder 9 has a red-hot part 1.
6 is formed, and a large through hole 17 is provided. On the 1st, there is an outer cylinder, which is an outer body made of a transparent material such as glass, and is placed on the outer cylinder a9. 19 is a top frame, and an air passage 20 between the red-hot part 15 and the outer cylinder b19
It is placed on the upper end of the red-hot part 15 so as to cover the ends of the outer cylinder b1B, and fixes the outer cylinder b1B. Reference numeral 21 denotes a flow control tube that is a fluid control installed inside the inner flame tube 6, and extends from near the tip of the wick 1 to a position below one end of the inner flame tube 6, and is formed between the inner flame tubes 6. The entire control area 22 is provided so as to be shielded by its bottom surface. 2a is an air introduction path.

Reference numeral 24 denotes a flow control plate having approximately the same diameter or a slightly larger diameter than the flow control tube 21, and is set in the horizontal direction with a slight gap above the flow control tube 21. 2S is a fixed leg that fixes the flow control plate to the flow control tube 21.

In the above configuration, when the lamp wick 1 is ignited, combustion starts,
High-temperature combustion gas from combustion rises in the combustion chamber 8, creating a thermal draft, and the air necessary for combustion flows into the inner flame tube 6,
The air is supplied into the combustion chamber 8 through the air hole 11 of the outer flame cylinder 7 and the through hole 17 of the red-hot part 16, and combustion continues, and during strong combustion,
A flame fr is formed as shown in FIG. Looking at the flow of combustion exhaust gas and air at this time, the flow within the air passage 20 is almost the same as in the conventional example shown in FIG. 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 a, which ascends the air introduction path 23. Since the flow indicated by the white arrow s is regulated by the flow control plate 24, some of it is supplied to the air holes 11 and ventilation holes 13 above the inner flame tube 6 as shown by the white arrow C, but most of it is supplied to the air hole 11 and the ventilation hole 13 above the inner flame tube 6 as shown by the white arrow d. In this way, the air descends considerably below the control area 22, and is also supplied to the combustion chamber 8 from the air holes 11, which are relatively below the control area 22. Further, the fuel vaporized by the flow shown by the white arrow a becomes a mixed gas with air and rises in the combustion chamber 8 mainly as shown by the black arrow e. However, because the pressure inside the control area 22 becomes negative due to the flows shown by the white arrows c and d, a part of the mixed gas flows into the control area 22 as shown by the black arrow f and rises. Therefore, the control area 22 is filled with unburned gas. On the other hand, due to the action of the flow control plate 24, clean air is introduced considerably downward into the control area 22 as shown by the white arrow d, and this clean air is mixed with the unburned gas that has flowed in as shown by the black arrow f. As shown by the black arrow g, the air is supplied into the combustion chamber 8 from the air hole 11 of the inner flame tube 6 and burns over a wide area of the inner flame tube 6, so that the air balance between the inner flame tube 6 side and the outer flame tube 7 side is broken. Combustion takes place without any problems. Therefore, during strong combustion, the red-hot portion 16 can also obtain a good red-hot state.

Next, when the exposed height of the lamp wick 1 is lowered to produce weak combustion, the flame gradually falls into the combustion chamber θ and becomes a 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 between the air flow mountain arrow (d) and the unburned gas drops downward, and the middle and lower part of the control area 22 becomes a good mixing area, forming a flame holding state in this area and causing the wall surface of the inner flame cylinder 6 to become red hot. The combustion is promoted, and the flame fIl formed above completes the combustion. In addition, the air discharged from the air holes 11 and 13 above the flame f8 is clean and contains almost no CO, and the exhaust gas characteristics (CO/C
O2) becomes good.

That is, according to this embodiment, the unburnt gaff and air are introduced into the control area 22, mixed, and efficiently supplied to the combustion chamber 8, thereby improving the air balance between the inner flame tube 6 side and the outer flame tube 7 side. Since combustion is performed without destroying the flame, it is possible to obtain a good red heat state during strong twist firing, and during weak combustion, the inner flame cylinder 6 contains almost no unburned gas, which improves the exhaust gas characteristics. can be improved. Therefore, there is no need to reduce the combustion load in the combustion chamber 8 or reduce the height of the combustion chamber in order to improve the exhaust gas characteristics during weak combustion as in the conventional case.

FIG. 3 shows the C-C' line (control area 22) of the embodiment shown in FIG.
) and the DD' line (air introduction path 23), the co concentration distribution was measured during weak combustion.

At the C-C' line position, high concentration of co
is detected, but it gradually becomes thinner in and near the flow control tube 21, and is considerably diluted at the upper end of the inner flame tube 6.The upper part of the inner flame tube 6 is in a clean state with a low co concentration. I understand that. It can be seen that at the DD' line position inside the flow control tube 21, the CO concentration is low over the entire area, and clean air is being supplied. As a result of the above, the exhaust gas characteristics above the inside of the inner flame tube 21 are significantly improved compared to the conventional example.

Figure 4 shows the combustion amount -C○/C0 for this embodiment and the conventional example.
These are the results of measuring two characteristics. In the conventional example (broken line), the Co/CO2 value rises rapidly as the combustion amount decreases,
Although the exhaust gas characteristics have deteriorated, in this example (solid line), even if the combustion amount is reduced, CO/CO2 remains below 0.002, indicating that the characteristics have been significantly improved and the effects of the present invention are demonstrated. It is clear.

In the above embodiments, a cylindrical combustion device has been described, but the same applies to a combustion device having a flat plate structure. Further, the fuel supply section may be of a type in which liquid fuel vaporized by another vaporizing means is supplied without using a lamp wick, or a type in which gaseous fuel is supplied.

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

(1) Inside the inner flame, extending from near the position facing the fuel supply part to a position below the upper end of the inner flame, and shielding the control area formed between the inner flame and the inner flame with its bottom surface. Since the fluid control area is provided, the air flow rising through the air introduction path and being supplied above the inner flame body creates a negative pressure in the υ control area, and unburnt gas is introduced from the combustion chamber. Therefore, the controlled area has a high concentration of c.
However, this mixed gas hardly flows out into the air introduction passage, and the clean air flow in the air introduction passage and the mixed gas in the control area are separated, and the clean air flows above the inner flame body. air is supplied.

(2) Since the flow control plate is installed above the control fluid with a slight gap, clean air is introduced well below the control region, mixes with unburnt gas, and then passes through the air hole of the inner flame body. It is supplied to the combustion chamber and can promote combustion over a wide range of the inner flame body. Therefore, combustion can be performed without destroying the air balance between the inner flame body side and the outer flame body side, and a good red-hot state can be obtained during strong twist firing.

(j In the controlled area, unburnt gas and air are in a mixed state,
During weak combustion, a good mixing state is formed at a certain height of the inner flame body depending on the amount of combustion, a flame holding state is formed in the air holes of the inner flame body at that position, the wall surface of the inner flame body becomes red hot, and combustion begins. promote. Furthermore, the combustion is completed by the flame formed above.

■ The flow of unburned gas above the inner flame is blocked by the clean air flow supplied to the inner flame.

Due to this shielding effect, the inside of the upper part of the inner flame cylinder contains almost no unburned gas, so even if the flame falls into the combustion chamber during weak combustion, it will not be able to escape from the air hole or ventilation hole above the inner flame body. a
Coal gas is not directly released into the atmosphere.

As a result of the above effects, it is possible to obtain a good red-hot state during strong twist firing, and to significantly improve exhaust gas characteristics during weak combustion, thereby obtaining a combustion device with good combustion characteristics and a wide range of combustion adjustment.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the essential parts of a combustion device according to an embodiment of the present invention, Fig. 2 is a flow diagram inside the combustion device, and Figs. 3 and 4 are for explaining the effects of the device. Characteristic diagram of
FIG. 5 is a sectional view of a main part of a conventional combustion device, and FIG. 6 is a characteristic diagram of the conventional combustion device. 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...
Air introduction passage, 24... Current control plate. Name of agent: Patent attorney Toshio Nakao and one other person I
--1 Lamp wick 6- Inner flame section 7- Outer Kitasaki 8--1 Combustion chamber? - Outer cylinder 22 - I'l flow area z3 - Air introduction passage 24 - - Air flow slope Fig. 2 Fig. 3

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; a fuel supply part set at the lower end of the combustion chamber formed between the inner flame bodies; and a fuel supply part located inside the inner flame body and located below the upper end part of the inner flame body from near a position facing the fuel supply part. a fluid control member that extends up to the inner flame body and whose bottom surface shields a control area formed between the inner flame body and the inner flame body; Combustion device with the same or slightly larger baffle plate.