JPS58153014A - Combustion device - Google Patents

Abstract

PURPOSE:To reduce a raising flame over a combustion cylinder and improve a safety of the combustion device by a method wherein a raising flame prevention body is arranged over the inner flame cylinder. CONSTITUTION:An inner flame cylinder 10, outer flame cylinder 11 and an outer cylinder 12 are constituted substantially in a concentric form with a relative proper clearance thereamong. Fuel gas is supplied from an extremity end of a wick 9 positioned at a lower end of the clearance between the inner flame cyliner 10 and the outer flame cylinder 11. Conbustion air is supplied to the gas from the lower end of the clearance between the outer flame cylinder 11 and the metallic cylinder part 12' and from the interior of the wick guide cylinder 10, and then mixed with the gas. Numeral 13 indicates a raising flame prevention body and its outer circumfrerence is formed to cover a clearance between the inner flame cyliner 10 and the outer flame cylinder 11 up to an outside part thereof. Thus, since the large raising flame is turned outwardly by the raising flame prevention plate 13 to cause the height of the raising flame to be decreased, its mixing with secondary air is improved and an amount of raising flame is reduced and a guite safe operation can be assured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustor, and more particularly to preventing flame propagation outside the appliance.

In an oil combustor that generally uses a wick and sustains combustion through a natural draft, a) If the wick is left out all at once, b) If there is a wind that disrupts combustion. C. If the height of the wick is adjusted all at once from the normal use position or a relatively low position to the highest position, the flame may spread from the combustion tube towards the shade and onto the large plate of the appliance, causing a fire. There was a risk that this could happen.

Such a conventional example is shown in FIGS. This shows a so-called porta-pull oil stove. First, a combustion tube 2 called a chimney is provided inside the main body case 1, which is 3° box-shaped and has an open front, which will be explained from this configuration. A cylindrical flame shield 4 is provided on the lower surface of the top plate 3 corresponding to d.

In other words, a flame is generated upward from the combustion tube 2.
J, the flame 6 is allowed to enter the flame shield 4, and the flame 6 is prevented from leaking upward from the exhaust port 6 to the top plate 3. However, in this configuration, (1) the flame shield 4
Since it is a separate part, the cost is high.

(2) Heat is concentrated in the center of the top plate 3 by the flame shield 4, causing warpage and thermal deformation in some parts.

(3) Father, the center of the top plate 3 discolors due to high temperatures, so aluminized steel plates cannot be used.

(4) Depending on the size and height of the flame shield 4, even if a catalyst is intended to be installed above the combustion tube 2, it cannot be installed because there is less surplus space.

It had the following drawbacks.

The present invention solves the above problems by improving the combustion tube itself and eliminating the flame shield. below,
An embodiment of the present invention will be explained with reference to FIGS. 1 to 4. Note that the main body case 1 will be explained using the one shown in FIGS.

In FIG. 1, 7. All'1ll-shaped core guide tube,
6, a fuel tank (not shown) provided in the lower space of the main body case 1 in FIG.

Next is the structure of the combustion tube placed on the upper part of the core guide tubes 7 and 8. 10 is a cylindrical inner flame tube having many small holes, and 11 is provided to cover the outer periphery of the inner flame tube 1o. It is a cylindrical outer flame cylinder made up of an incandescent body 11a made of a perforated plate such as a punched plate, a wire mesh, a lath net, etc., and an outer flame body 11b having a large number of small holes. Reference numeral 12 denotes a cylindrical outer cylinder made of a heat-transmissive material such as heat-resistant glass, which covers the outer peripheral side surface of the outer flame cylinder 11 and has a metal cylinder part 12' at the lower part. The inner flame tube 10 and the outer flame tube 1
1 and the outer cylinder 12 are arranged approximately concentrically with an appropriate distance from each other, and the fuel gas flows from the tip of the lamp wick 9 located at the lower end of the gap between the inner flame cylinder 10 and the outer flame cylinder 11. supplied,
The structure is such that combustion air is supplied and mixed with this gas from the lower end of the gap between the outer flame tube 11 and the metal tube portion 12' and from inside the core guide tube 7. Reference numeral 13 denotes a flame preventing plate having a disk-shaped planar shape, which is used as an example of a flame preventing body, and its outer periphery is formed to cover the gap between the inner flame tube 1o and the outer flame tube 11 to the outside. ing. Therefore, what would normally be a large standing flame is rotated outward by the flame preventing plate 13, which lowers the height of the standing flame, and also improves mixing with secondary air, reducing the amount of standing flame itself. This makes it extremely safe.

Regarding the distance A between the flame prevention plate 13 of the ox octopus and the upper part of the outer cylinder 12, the narrower it is, the more advantageous it is to preventing flame formation. Characteristic(
For example, disturbances occur due to a decrease in the amount of combustion, an increase in carbon monoxide in the combustion exhaust gas, and the generation of combustion noise due to the flame lift phenomenon. Therefore, it is necessary to decide from the viewpoint of both flame prevention and combustion characteristics.

Figures 2 to 4 show the relationship between the interval A and each combustion characteristic, and the horizontal axis shows the opening area 5 (-) of the interval A and the case when there is no flame prevention plate 13, in other words, when there is no pressure drop. The maximum combustion amount E (W/h) and the ratio S/E are taken.

The maximum combustion amount shown in Figure 2 was tested at Rated Rating 2.
The amount of combustion at maximum combustion in a 001121/h kerosene stove does not change much until the S/E value is 1.6, decreases by about 1oo7/h at 1.2, and decreases to the extent that it is less than the rated combustion amount at 1.0. becomes 1. This is due to pressure loss rather than 1, and if S/E is 1.2 or more, it indicates that there is no large pressure loss.

Next, the Co/CO2 during combustion shown in Figure 3 is S/E
When the value is 1.01, there is almost no change, and the maximum combustion amount becomes lower than the rated value, and the CO/CO2 value increases.
“Ru.

Furthermore, as shown in Fig. 4, regarding the generation of combustion noise, as a result of the experiment, the S/E value was 1. We tested 10 units that produced discontinuous combustion noise with ○, and there were 3 units, but none of them were higher than 1.2. The results of checking these combustion characteristics using appliances with different ratings show almost the same trends, so the S/E value is 1.
．． The number is limited to 2 or more. still,
In FIG. 1, 13a is the inner flame cylinder 1o of the flame prevention plate 13.
The aim is to reduce the pressure loss as much as possible with small openings such as small holes provided in the part facing the gap between the outer flame cylinder 11 and the outer flame cylinder 11.
The combustion flame is directed straight through this small opening 13a.
The flame should be large enough not to protrude and have a diameter of about 12.6 mm or less in area.If the flame is larger than that, the flame tends to extend upward from the small opening 13a. -! The purpose of the small opening 13a of the octopus is to make the flame prevention plate 13 red hot. For example, if bad fuel is used and combustion deterioration occurs, it is this flame prevention plate 13 located above that is not cut and the red heat deteriorates, and when the red heat of this part becomes inferior, the lamp wick 9 Air-baked IJ
This can be used as a guideline for implementation of training.

As described above, according to the present invention, the flame preventing body can suppress the rising flame upward of the combustion cylinder, making it safe, and the conventional flame shielding body under the top plate can be abolished.
For example, the space above the combustion cylinder can be made large, and therefore a catalyst or the like can be easily installed in this space.

In the above embodiment, from the lamp wick 9 to the inner and outer tubes 10.1
Although the explanation has been given using an example of an oil combustor that supplies fuel between the inner and outer cylinders 10 and 11, the present invention provides the same effects even if it is a gas combustor that supplies gas between the inner and outer cylinders 10 and 11.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the combustion tube of a combustor l according to an embodiment of the headquarters, Figs. 2 to 4 are combustion characteristic diagrams of the same, Fig. 6,
FIG. 6 is a top view and a front view showing a conventional example. 1o... Inner flame tube, 11... Outer flame tube, 1
2... Outer cylinder, 13... Flame prevention body, 1
3a...Small opening. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (4)

[Claims] (1) A combustion tube for burning fuel is provided, and the combustion tube is
It has a double-tube structure consisting of an inner and outer flame tube made of perforated plates such as punched plates, wire mesh, and lath mesh, and an outer tube on the outside of the outer flame tube. Gap-Niho”:
A combustor equipped with a flame prevention body that is rubbed outward from the rim. (2) The narrowest opening area S (ml) formed by the flame preventive body and the outer cylinder described in , and the maximum combustion amount E (Ial/h) when the flame preventive plate is removed. The ratio S/E is 1
．． 21. The combustor according to claim 1 as set forth below. (3) A small opening such as a small hole or a small notch is provided in a portion of the flame preventing body that faces the gap between the inner flame tube and the outer flame tube. The combustor according to paragraph 2. (4) The combustor according to claim 1, wherein the area of each small opening is 12.6 or less.