JPH0610533B2 - Liquid fuel combustion device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a liquid fuel combustion apparatus that vaporizes and burns liquid fuel.

2. Description of the Related Art A conventional liquid fuel system is constructed as shown in FIG. That is, in FIG. 4, 1 is a fuel nozzle for ejecting fuel, and 2 is a vaporizing cylinder for vaporizing the fuel (shown by a broken line in the figure), which is formed to be long and thin. 3 is a mixing chamber for mixing vaporized fuel and air, 4 is a fuel passage, 5 is a fuel passage 4
Is a fuel supply path branched from, a flame port, 6 is a combustion chamber wall forming a combustion chamber, and 8 is a flame. Reference numeral 9 denotes a heater (indicated by a broken line in the figure) embedded in the bottom of the vaporization cylinder.

The operation of the combustion device configured as described above will be described below.

First, when the heater 9 is energized and the vaporization cylinder 2 reaches a predetermined temperature, combustion air and liquid fuel are sent into the vaporization cylinder 2, and the liquid fuel is vaporized by the vaporization cylinder 2 and mixed with air to mix with the mixing chamber. Sent to 3. Then, the mixed gas passes from the mixing chamber 3 through the fuel passage 4 to the flame outlet 6 from a large number of fuel supply passages 5 and is ignited by a suitable ignition means to form a flame 8.

However, in the above-described conventional combustion device, since the vaporization cylinder 2 is a simple cylinder, the air supplied from the inlet and the fuel vaporized in the vaporization cylinder are hardly mixed, and the mixing chamber 3 Is sent to the fuel passage 4 with a non-uniform concentration of the mixed gas.
Through a large number of fuel supply paths 5 to reach the flame port 6. As a result, a difference in the concentration of the mixed gas is generated by the flame port 6, causing local blow-off, CO generation, and other deterioration of the combustion state.

Further, since the vaporization cylinder 2 is tubular, a part of the fuel ejected from the nozzle 1 to the vaporization cylinder 2 may be sent to the mixing chamber together with air as liquid without hitting the wall surface of the vaporization cylinder. In the room, fuel that did not vaporize was accumulated, causing tar to be generated.

The present invention solves the above-mentioned problems of the prior art by completely vaporizing the ejected fuel in the vaporizing cylinder, and by thoroughly mixing the vaporized fuel and air in the vaporizing cylinder to stabilize combustion and tar formation. The purpose is to prevent this.

Means for Solving the Problems In order to achieve this object, the present invention provides a convex portion on both sides of a longitudinal side wall of a vaporization cylinder and attaches a vaporization cylinder lid to the convex portion, and the vaporization cylinder lid is provided in a combustion chamber. It is configured to be heated by the flame formed.

Action With the above configuration, the fuel supplied from the vaporization cylinder inlet collides with the convex portion of the vaporization cylinder side wall kept at a high temperature, and a part of the fuel is vaporized here. At this time, the fuel that has not been vaporized and scattered has collided with the convex portion on the side wall of the vaporization cylinder on the opposite side to the vaporized fuel. The fuel thus ejected into the vaporizing cylinder collides with the convex portion provided on the side wall of the vaporizing cylinder and repeatedly vaporizes, and almost all is vaporized near the outlet of the vaporizing cylinder. Further, the convex portion provided on the side wall of the vaporizing cylinder functions to disturb the flow of air in the vaporizing cylinder, and makes the mixing of the vaporized fuel and air sufficiently satisfactory. In addition, the convex portion serves as a mounting portion for the vaporization tube lid, which effectively transfers the heat of the vaporization tube lid heated by the combustion heat to the vaporization tube and thickens the wall thickness of the vaporization tube for mounting the vaporization tube lid. The subcutaneous cylinder wall can be made thinner without the need.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, 10 is a vaporizing cylinder for vaporizing liquid fuel, which is formed to be long and thin. Reference numeral 11 denotes a fuel nozzle for ejecting liquid fuel to the vaporization cylinder 10, which communicates with the pump 12. Reference numeral 13 denotes an air passage that guides the combustion air from the blower 14 to the vaporization cylinder 10, and opens together with the fuel nozzle 11 at the inlet 10 a of the vaporization cylinder 10. Reference numeral 15 is a mixing chamber provided at the outlet portion 10b of the vaporization cylinder 10 and communicates with the fuel passages 16 on both sides. A large number of fuel supply passages 17 are branched from the fuel passage 16, and the other end of the fuel supply passage 17 is connected to the combustion chamber wall 1
8 and penetrates into the combustion chamber 19 to form a flame port 20. Here, the two combustion chamber walls 18 face each other, and the flame ports 20 are provided at positions facing each other. Reference numeral 21 is a flame formed on the flame port 20, and the flames 21 from both sides face each other. Reference numeral 22 denotes a vaporization cylinder lid that partitions the combustion chamber 19 and the vaporization cylinder 10 from each other, and is provided at an upper opening of the vaporization cylinder 10. Two
Denoted at 3 are convex portions alternately provided on both side walls of the vaporization cylinder 10, and the vaporization cylinder lid 22 is attached by screws 22a. Two
Reference numeral 4 denotes a heater embedded in the vaporization cylinder 10.

Next, the operation of the above configuration will be described.

First, when the heater 24 is energized and the vaporization cylinder 10 reaches a predetermined temperature, the blower 14 is operated and the combustion air is sent to the vaporization cylinder 10 through the air passage 13. Also, pump 1
2 also operates, fuel is ejected from the fuel nozzle 11 into the vaporization cylinder 10, and collides with the convex portion 23 (a) provided on the side wall of the vaporization cylinder 10. At this time, since the vaporization cylinder 10 has reached the temperature at which the fuel vaporizes, a part of the fuel that collides with the convex portion 23 (a) vaporizes. At this time, the fuel which is not vaporized and scattered advances along with the combustion air sent from the blower 14 to the vaporization cylinder 10 inside the vaporization cylinder 10. However, on the way, the fuel is provided on the side wall opposite to the convex portion 23 (a). It collides with the convex portion 23 (b) and is vaporized. The fuel thus ejected from the fuel nozzle 11 to the vaporization cylinder 10 collides with the convex portions 23 provided alternately on the side wall of the vaporization cylinder 10 one after another and repeatedly vaporizes, so that it is supplied near the outlet of the vaporization cylinder 10. All fuel vaporizes.

Further, since the convex portion 23 provided on the vaporization cylinder 10 functions to disturb the flow of the combustion air supplied from the inlet portion, the vaporization cylinder 1
The fuel vaporized in 0 and the combustion air are sufficiently mixed to have a uniform concentration and are sent to the mixing chamber 15. The mixed gas sent to the mixing chamber 15 flows into the fuel passage 16 as shown by the arrow in FIG. Further, the mixed gas advances from the fuel passage 16 to the fuel supply passage 17 that is branched into a large number, and the fuel supply passage 1
It spouts from the opening 7 or the flame port 20 into the combustion chamber 19. When the mixed gas emitted from the flame port 20 is ignited, a flame 21 is formed to continue combustion. At this time, the vaporization cylinder lid 23 is heated simultaneously with the combustion chamber wall 18 by the radiation from the flame 21, and the vaporization cylinder 10 is heated by heat transfer from the vaporization cylinder wall 23. At this time, the convex portion 2 provided on the side wall of the vaporization cylinder 10
In No. 3, the heat transfer area is increased and the heat is also transferred through the screw 22a, so that the efficiency of heat recovery is improved. Therefore, the vaporization cylinder 10 can be maintained at a more suitable temperature.

As described above, according to the present invention, by providing the convex portion on the side wall of the vaporization cylinder, the fuel injected into the vaporization cylinder can be completely vaporized, and the combustion air supplied from the vaporization cylinder inlet is provided. The vaporized fuel can be sufficiently mixed, combustion can be made stable and good, and tar generation due to the fuel that is not vaporized can be prevented.
Moreover, the convex portion can improve the efficiency of heat recovery from the vaporization cylinder lid, and since the vaporization cylinder lid is mounted by using this convex portion, it is not necessary to make the vaporization cylinder wall thick to mount the vaporization cylinder lid. There is also an advantage that the time required for heating to the vaporization temperature can be shortened by reducing the thickness.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a liquid fuel combustion apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view seen from above, FIG. 3 is a plan view of the vaporization cylinder, and FIG. 4 is a conventional combustion apparatus. FIG. 10 ... Vaporization cylinder, 19 ... Combustion part (combustion chamber), 22 ...
Vaporizing cylinder lid, 23 ... convex portion.

Claims (1)

[Claims] 1. A horizontally elongated vaporization cylinder having one end for fuel and air inlets and the other end for mixed gas outlets, and a mixed gas from the outlet of the vaporization cylinders arranged along the longitudinal direction of the vaporization cylinder. A combustion chamber to be supplied, and a vaporization cylinder lid that partitions the space between the combustion chamber and the vaporization cylinder and is heated by a flame formed in the combustion chamber are provided, and the walls of the vaporization cylinder that face each other in the longitudinal direction are opposed to each other. A liquid fuel combustion apparatus in which a plurality of convex portions are provided on both sides and the vaporization cylinder lid is attached to the convex portions.