JPH02122104A - Combustion cylinder of oil burner - Google Patents

Abstract

PURPOSE:To stably burn in a condition to throttle a burning quantity by sucking air supplied to small holes of the center part and the lower part of an outer flame cylinder from the downward of gaps between the outer flame cylinder and an outer cylinder and supplying air supplied to small holes of the upper part of the outer flame cylinder from penetrated holes on the halfway of a combustion cylinder. CONSTITUTION:Air taken in through penetrated holes 8 from the halfway of a combustion cylinder establishes communication between the gaps between an outer flame cylinder 2 and an outer cylinder 2 and other gaps (a), so that air is allowed to flow in the gaps between the outer flame cylinder 2 and the outer cylinder 3. Further, air flowing in small holes of the outer flame cylinder 2 from the penetrated holes 8 is supplied to the inside of the outer flame cylinder 2 from the upper part of small holes 2''' of a small passage and small holes 2' of a large passage. On the other hand, when wick 11 is lowered in burning, air flowing in a flame cylinder 5 from the small holes in the upper part of the outer flame cylinder 2 by the draft of the flame cylinder 2 is allowed to flow from the penetrated holes 8 of a control plate 7 even if the upper part of the gaps of an inner flame cylinder 1 and the outer flame cylinder 2 has already been burned, and the air allowed to flow in from the downward of the gap between the outer and the inner flame cylinders 1, 2 is not remarkably changed. As the result, air supply for the center part and the lower part of the inner and the outer flame cylinder 1, 2 is performed smoothly and incomplete combustion does not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mechanism for improving combustion performance at low calorific value in a combustion tube of an oil combustor having a flame expander in a reburning section.

[Conventional technology]

Oil combustors that use a reburner with a flame expander above the twin-tube combustion tube require a larger amount of air to flow into the base of the flame expander than those that use a blue flame combustor as the afterburner. It is. The white-yellow flame formed by the flame expander when supplied with a large amount of air enables combustion with a large calorific value in a short flame, and the combustion rate is wider during the combustion amount adjustment than when a blue flame combustion device is used as a reburner. There are some characteristics. (Jikko Sho 62-1527
(Refer to No.) [Problem to be solved by the invention] The reason why the combustion amount can be widened during the combustion amount adjustment of the combustion tube using a flame expander in the afterburner is that the height of the white-yellow flame formed in the afterburner is If the wick is lowered so far that no flame is formed in the reburner, abnormal combustion will occur and a large amount of incompletely combusted gas will be released. Therefore, in the past, stable combustion could not be achieved with such a reduced combustion amount.

[Means for solving problems]

This invention makes incomplete combustion less likely to occur even when the wick is lowered by supplying the air taken in from the outside to the flame expansion device for combustion inside the double-tube combustion cylinder.
1 is an inner flame tube constituting a dual-tube combustion tube, 2 is an outer flame tube, and 3 is an outer tube.
', and the lower part is formed by an impermeable tube 3''. 4 is a flame expander 5 installed above the top plate of the inner flame tube 1, and is a flame tube that covers the outside of the flame expander. 6 forms the wall of the next combustion chamber.The flame tube 5 is mounted on the outer end, and the inner and outer flame tubes 1 are placed on the inner edge.
・The bottom plate of the secondary combustion chamber 7 is shown above the gap 2, and 7 is a control plate installed at the outer end of the secondary combustion chamber through the gap a with the bottom plate 6 of the secondary combustion chamber, and the inner edge of the control plate 7 is connected to a heat-resistant heat-transmissive cylinder 3' forming the outer cylinder 3, and the gap communicates with the gap between the outer flame cylinder 2 and the outer cylinder 3.

8 is a through hole drilled in the control plate 7 that looks into the gap a, and 9 is the gap a.
This is an air hole drilled near the upper end of the outer flame tube 2 facing the outer flame tube 2, and if necessary, a small hole 1 is drilled in the bottom plate 6 of the secondary combustion chamber extending into the gap 2E.
0, and the opening area of the through hole 8 is larger than the total opening area of the air hole 9 and the small hole 10. Also, outer flame tube 2
The small hole drilled in is the small hole 2 in the part facing the opaque tube 3
The diameter of the small hole 2' in the center and lower part of the part facing the heat-resistant heat-transmitting cylinder 3' is larger than that of ``, and the small hole 27 of the part facing the upper part of the heat-resistant heat-transmitting cylinder 3' is also made larger. diameter small hole 2'
It is set smaller than.

11 is a wick whose tip looks into the gap between the inner and outer flame tubes 1 and 2;
Reference numeral 12 denotes a core housing tube that holds the core 11 therebetween, and the inner and outer flame tubes 1 and 2 are mounted on the core housing tube I2. 13 is outer cylinder 3
An air baffle plate 14 has a large number of small holes covering the lower end of the gap between the opaque tube and the outer flame tube 2. The outer tube holder 14 is a plate that looks into the outer flame tube 2 from the upper part of the impermeable tube. The outer tube holder of the heat transmitting tube 3' is mounted on a plate 14, and the outer tube holder controls air through the gap between the inner edge of the plate 14 and the outer flame tube 2.

[Explanation of action]

This invention, which has the configuration described above, performs combustion almost in the same way as a conventional combustion tube, and the petroleum gas vaporized from the wick 11 is thermally decomposed and partially combusted while passing through the gap between the inner and outer flame tubes 1 and 2. Low molecular weight hydrocarbons such as methane and carbon monoxide that rise and are thermally decomposed are transported by a large amount of air supplied from the through hole 8 through the gap a and the air hole 9, and a large amount of air supplied from within the flame spreader 4. The carbon is released and completely burns with a white-yellow flame.

By the way, the air taken in from the middle of the combustion tube through the through hole 8 during combustion is taken in by making the opening area of the through hole 8 larger than the opening area of the air hole 9 and the small hole 0. By making the gap between the outer flame tube 2 and the outer tube 3 communicate with the gap a, the air supplied from the through hole 8 flows into the gap between the outer flame tube 2 and the outer tube 3. Inflow. In addition, the small hole of the outer flame tube 2 has a small diameter of the small hole 2'' in the part that follows the air hole 9, and a large diameter small hole 2' that continues below the small diameter hole z'', so the through hole 8 The air flowing into the small hole of the outer flame tube 2 is also supplied to the inside of the outer flame tube 2 from the upper part of the small diameter hole 2'' and the large diameter small hole 2'.

On the other hand, when the wick 11 is lowered during combustion, low molecular weight hydrocarbons such as methane and carbon monoxide after thermal decomposition complete combustion in the inner and outer flame tubes 1 and 2. At this time, conventionally, the air that entered from the lower part of the gap between the outer flame tube 2 and the outer flame tube 3 was also supplied to the upper part of the outer flame tube 2, so when the combustion was completed in the inner and outer flame tubes 1 and 2, The air in the gap between the flame tube 2 and the outer tube 3 easily escapes into the small hole strainer tube 5 at the top of the outer flame tube 2, and the center and lower parts of the inner and outer flame tubes 1 and 2 where reverse ζζ combustion continues.・The air supply of ＼ decreases, causing incomplete combustion.

In this invention, even if the upper part of the gap between the inner and outer flame tubes 1 and 2 has completed combustion, the air flowing from the small hole in the upper part of the outer flame tube 2 to the flame tube 5 is mainly controlled by the draft of the flame tube 5. Board 7
The air enters through the through hole 8, and the air that enters from below the gap between the outer flame cylinder 1 and the outer cylinder 2 does not change significantly. For this reason, air is smoothly supplied to the center and lower portions of the flame tubes 1 and 2 while combustion continues, and incomplete combustion does not occur.

In addition, the small holes in the outer flame tube 2 are provided with a small diameter hole 2'' at the bottom following the upper air hole 9, and a large diameter hole 2' at the bottom of the small diameter hole 2''. Air can be supplied from the through hole 8 of the control plate 7 to the upper part of the small hole 2' below the small hole 21.
Air from outside the combustion tube can now be supplied over a wide range of the outer flame tube 2- and the L section.

[Explanation of effects]

As described above, in this invention, the air supplied to the small holes in the center and lower part of the outer flame tube 2 is sucked from below the gap between the outer flame tube 2 and the connecting part 3, and the air is supplied to the small holes in the upper part of the outer flame tube 2. Since the air supplied to the wick is supplied from the through hole 8 in the middle of the combustion cylinder,
Even when combustion is completed at the center of the inner and outer flame cylinders, air can be supplied smoothly by lowering the temperature of 1, thereby preventing the occurrence of incomplete combustion.

For this reason, when combined with the flame expansion device used in the afterburning section, the exhaust gas performance of the JIS standard can be cleared even if the combustion amount is reduced by 40% of the maximum calorific value per meter, making it possible to widely adjust the combustion amount. is now possible.

[Brief explanation of drawings]

The drawing is a sectional view of this invention.

Claims (1)

[Claims] A double-tube combustion tube is provided in which an inner flame tube 1, an outer flame tube 2, and an outer tube 3 are arranged concentrically.
- The lower part is composed of an impermeable cylinder 3'', and a flame expander 4 is arranged above the inner flame cylinder 1, and a secondary combustion chamber wall with a larger diameter than the outer cylinder 3 is placed outside of the flame expander 4. A secondary combustion chamber bottom plate 6 on which the lower end of the flame tube 5 is mounted is provided with a flame tube 5 constituting the inner and outer flame tubes 1.
- In an oil combustor that looks above the gap 2, the secondary combustion chamber bottom plate 6 is attached to the upper end of the outer flame cylinder 2, and the control plate 7 is attached to the secondary combustion chamber bottom plate 6 through the gap a. Connected to the upper end of the outer cylinder 3, a through hole 8 is provided in the control plate 7 so as to look into the gap a,
In addition, an air hole 9 is provided in the outer flame tube 2 facing the gap a, and the outer flame tube 2 facing the heat-resistant heat permeable tube 3' has small holes 2' in areas other than the upper part facing the impermeable tube 3" in the lower part. The small hole 2'' in the upper part of the outer flame tube 2 facing the heat-resistant heat transmitting tube 3' is set to have a smaller diameter than the large diameter small hole 2''. The characteristic combustion tube of the oil combustor.