JPH0437321B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a forced vaporization type liquid fuel combustion device that employs a swirl vaporization mixing method.

[Prior Art] FIG. 2 is a sectional view showing a liquid fuel combustion device disclosed in, for example, Japanese Utility Model Publication No. 16833/1983, and FIG. 3 is a partially cutaway plan view thereof. In the figure, 1
2 is a cylindrical combustor consisting of an outer cylinder 1a, an inner cylinder 1b and an end wall 1c, 2 is a heater embedded in the combustor 1, 3 is a fuel injection nozzle, and 4 is primary air through which the nozzle 3 passes. The supply port 5 is a vaporization mixing chamber formed in the combustor 1 and consisting of, for example, a spiral annular passage, and forms a vaporization mixing section for vaporizing fuel and mixing it with primary air. 6 is a partition wall that partitions the vaporization mixing chamber 5 into a spiral shape, and 7 is a partition plate that covers the upper surface of the vaporization mixing chamber 5, which separates the vaporization mixing chamber 5, which is the vaporization mixing section, from a combustion section, which will be described later. These two parts are communicated with each other by a communication port 7a opened near the. Reference numeral 8 designates a first burner plate mounted above the partition plate 7, which has an air-fuel mixture passage port 8a in the center and a flame hole 8 consisting of a plurality of grooves in the outer periphery.
b is formed. Reference numeral 9 denotes a second burner plate placed on the first burner plate 8, and a flame hole 9a consisting of a plurality of slits is formed over the entire circumference. In this state, the flame hole 8b formed of the plurality of grooves forms a flame in the flame forming portion 10 on the outer cylinder 1a side. The first and second burner plates 8, 9 constitute a combustion section. 11 is a secondary air passage formed in the center of the combustor 1; 12 is another secondary air passage formed in the periphery; 13 is a combustion device main body that accommodates these;
4 is a combustion chamber.

In such a conventional combustion device, fuel and primary air are supplied from a fuel injection nozzle 3 and a primary air supply port 4 into a vaporization mixing chamber 5 heated by a heater 2, and are fed into a vaporization mixing chamber 5 heated by a heater 2, while swirling in a spiral shape as shown by an arrow. They are vaporized and mixed to form a mixture. This air-fuel mixture is guided to the flame holes 8b and 9a through the communication port 7a of the partition plate 7 and the air-fuel mixture passage port 8a of the first burner plate 8, and is ignited by an ignition means (not shown) to cause flames 15, 16. is formed, and the secondary air passages 11,1
The combustion is assisted by the secondary air supplied from 2, and combustion continues in the combustion chamber 14. After the combustion starts, the heater 2 is stopped, the combustion heat is recovered by the combustor 1, and the fuel is vaporized.

[Problem that the invention seeks to solve]

However, in the conventional liquid fuel combustion device as described above, the flame 16 formed in the flame forming part 10 by the flame hole 8b burns in contact with the outer cylinder 1a of the combustor 1, resulting in incomplete combustion and There was a problem in that soot adhered to the inner wall and tip of the cylinder 1a, as well as the spark plug and the like disposed in the vicinity, resulting in insufficient heat recovery and ignition errors.

The present invention is intended to solve the above problems,
It is an object of the present invention to provide a liquid fuel combustion device that prevents incomplete combustion in a flame forming part on the side of a combustor outer cylinder and prevents soot from adhering to the outer cylinder, spark plug, etc.

[Means for solving problems]

The liquid fuel combustion device of the present invention includes a combustor having an outer cylinder and an inner cylinder, and a vaporization mixing section formed between the outer cylinder and the inner cylinder so as to mix liquid fuel and primary air as a swirl flow and vaporize the mixture. a combustion section having a burner plate that causes the mixed gas vaporized in the vaporization mixing section to be ejected from a flame hole toward the outer cylinder side to form a flame; and a partition wall partitioning the vaporization mixing section and the combustion section and having a communication port. a plate, a secondary air passage formed on the outside of the outer cylinder, and a plurality of penetrations formed in the outer cylinder so as to supply secondary air from the secondary air passage to a flame forming part on the side of the outer cylinder. The combustion chamber is provided with a hole and a chamber portion formed in the combustion portion so as to face the through hole and communicating with the flame forming portion.

[Effect]

In the liquid fuel combustion device of the present invention, the liquid fuel and primary air are mixed and vaporized in the vaporization mixing section, and are ejected from the flame hole of the burner plate of the combustion section to be combusted. Then, secondary air is supplied from the secondary air passage to assist combustion, and the secondary air is jetted into the chamber portion from the through hole to supply the secondary air to the flame forming portion on the outer cylinder side. At this time, the pressure of the secondary air supplied from the through hole is equalized by the chamber part and then supplied to the flame forming part, so the flame formed in the flame forming part from the burner plate is caused by the secondary air supplied from the chamber part. This ensures uniform and complete combustion, and no soot is generated on the inner wall and tip of the outer cylinder, the spark plug, etc.

〔Example〕

FIG. 1 is a partial sectional view showing an embodiment of the present invention, and in the figure, the same reference numerals as in FIGS. 2 and 3 indicate the same or corresponding parts. In this embodiment, the first burner plate 8 consists of two plates, a substrate 8A and a laminated plate 8B, each having an air-fuel mixture passage port 8a and a groove-shaped flame hole 8b. Outer cylinder 1a is located on the outer periphery of substrate 8A below flame hole 8b.
A chamber portion 17 is formed opposite to the flame forming portion 10 and communicates with the flame forming portion 10 via a constriction portion 18, and a through hole 19 is formed in the outer cylinder 1a so as to communicate the chamber portion 17 and the secondary air passage 12. ing. The partition plate 7 is tightly fitted into the outer cylinder 1a, and an engagement part 20 made of a cut and raised piece is formed on the circumference of the intermediate part and engages with the inside of the base plate 8A of the burner plate 8. 8 is positioned at the center position to maintain a constant distance between the burner plate 8 and the outer cylinder 1a. The other configurations are the same as those in FIGS. 2 and 3.

In the liquid fuel combustion device configured as described above, combustion is basically performed in the same manner as in FIGS. 2 and 3, but a portion of the secondary air is passed through from the secondary air passage 12. The gas is ejected through the hole 19 into the chamber section 17, where the pressure is equalized, and the uniform pressure is supplied from the constriction section 18 to the flame forming section 10. In this way, the flame hole 8b of the first burner plate 8
Since sufficient oxygen is uniformly supplied to the flame 16 formed by the mixed gas ejected from the flame forming part 10, combustion in the flame forming part 10 becomes uniform and complete, and no soot is generated in the outer cylinder 1a, the spark plug, etc. do not. Further, since the burner plate 8 is positioned at the center position by the engaging part 20 and the distance from the outer cylinder 1a is constant, the chamber part 17 and the constricted part 18
maintains a constant volume or spacing, and the secondary air has a uniform pressure and flow rate over the entire circumference.

In addition, in the above description, the chamber part 17,
The shape, structure, number, position, etc. of the constricted portion 18, through hole 19, etc. are not limited to those shown in the drawings and can be changed.

〔Effect of the invention〕

According to the present invention, secondary air is supplied from the through hole to the flame forming portion formed on the combustor outer cylinder side through the chamber portion, thereby preventing incomplete combustion in the flame forming portion. Therefore, it is possible to prevent soot from adhering to the outer cylinder, spark plug, etc., and there is an effect that insufficient heat recovery and ignition errors can be prevented.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a portion of the embodiment, FIG. 2 is a sectional view of a conventional device, and FIG. 3 is a partially cutaway plan view. In each figure, the same reference numerals indicate the same or equivalent parts, 1 is a combustor, 1a is an outer cylinder, 1b is an inner cylinder, 5 is a vaporization mixing chamber, 6 is a partition wall, 7 is a partition plate, 7a is a communication port, 8 is a first burner plate, 8a is a mixture passage port, 8b and 9a are flame holes, 9 is a second burner plate, 10 is a flame forming section, 11 and 12 are secondary air passages, 17 is a chamber section, 18 is the aperture part, 1
9 is a through hole, and 20 is an engaging portion.

Claims (1)

[Scope of Claims] 1. A combustor having an outer cylinder and an inner cylinder, and a vaporization mixing section formed between the outer cylinder and the inner cylinder so as to mix and vaporize liquid fuel and primary air as a swirling flow; a combustion part having a burner plate that injects the mixed gas vaporized in the vaporization mixing part from a flame hole toward the outer cylinder side to form a flame; and a partition plate partitioning the vaporization mixing part and the combustion part and having a communication port. , a secondary air passage formed on the outside of the outer cylinder, and a plurality of through holes formed in the outer cylinder so as to supply secondary air from the secondary air passage to the flame forming part on the outer cylinder side. , and a chamber part formed in the combustion part so as to face the through hole and communicating with the flame forming part. 2. The liquid fuel combustion device according to claim 1, wherein the chamber portion communicates with the flame forming portion via the throttle portion. 3. The liquid fuel combustion device according to claim 1 or 2, wherein the partition plate has an engaging portion for positioning the burner plate.