JPH01203810A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To stabilize combustion and to prevent fuel from being made into a tarlike state, by a method wherein protrusion parts are alternately formed in a plurality of spots on the walls on both sides, positioned in a longitudinal direction facing each other, of a vaporizing cylinder, and a vaporizing cylinder cover is mounted to the protrusion parts. CONSTITUTION:Fuel is injected in a vaporizing cylinder 10 through a fuel nozzle 11, and is collided with a protrusion part 23a formed on the side wall of the vaporizing cylinder 10. A part of the fuel collided with the protrusion part 23a is vaporized, fuel not vaporized but flying is collided with a protrusion part 23b formed on a side wall on the opposite side for vaporization, and the fed fuel is all vaporized in the vicinity of the outlet of the vaporizing cylinder 10. Since a protrusion part 23 serve to disturb the flow of combustion air, fuel and combustion air are enoughly mixed together to produce uniform concentration, and the mixture is fed to a mixing chamber 15. When air-fuel mixture flowing out from a burner port 20 of a fuel feed passage 17 is ignited, flame 21 is formed to continue combustion. Through radiation from the flame 21, a vaporizing cylinder cover 22 is also heated simultaneously with a combustion chamber wall 18, and the vaporizing cylinder 10 is heated through transfer of heat from the vaporizing cylinder cover 22. In this case, the protrusion part 23 is increased in a heat transfer area, heat is also transferred thereto through a screw 22a, and the efficiency of heat recovery is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid fuel combustion device that vaporizes and burns liquid fuel.

2. Description of the Related Art A conventional liquid fuel device is constructed as shown in FIG. That is, in FIG. 4, 1 is a fuel nozzle that injects fuel, and 2 is a vaporization cylinder that vaporizes fuel (indicated by a broken line in the figure), which are long and thin. 3 is a mixing chamber for mixing vaporized fuel and air, 4 is a fuel passage, and 5 is a fuel passage 4
6 is a flame port, 7 is a combustion chamber wall forming a combustion chamber, and 8 is a flame. 9 is a heater (indicated by a broken line in the figure) buried in the bottom of the vaporization cylinder.

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

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

Problems to be Solved by the Invention However, in the above-mentioned 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 mixture chamber 3 The mixed gas is sent to the fuel passage 4 with a non-uniform concentration.
The fuel passes through a large number of fuel supply paths 5 and reaches the flame outlet 6. As a result, a difference in the concentration of the mixed gas occurs due to the flame port 6, which causes deterioration of the combustion state such as local blow-off and generation of CO.

In addition, since the vaporization tube 2 is cylindrical, a part of the fuel injected from the nozzle 1 into the vaporization tube 2 may be sent to the mixing chamber together with the air as a liquid without colliding with the wall surface of the vaporization tube. In the chamber, fuel that did not vaporize accumulated and caused the formation of tar.

The present invention solves the above-mentioned conventional problems.The present invention completely vaporizes the ejected fuel in the vaporization cylinder, and mixes the vaporized fuel and air sufficiently in the vaporization cylinder to stabilize combustion and turn it into tar. The purpose is to prevent

Means for Solving the Problems In order to achieve this object, the present invention has a structure in which protrusions are provided alternately on both sides of the longitudinal side wall of the vaporizer cylinder, and a vaporizer cylinder lid is attached to the protrusions.

Function: With the above structure, the fuel supplied from the inlet of the carburetor collides with the convex portion of the side wall of the carburetor cylinder kept at a high temperature, and a part of the fuel is vaporized here. At this time, the fuel that is scattered without being vaporized collides with a protrusion on the side wall of the carburetor cylinder on the opposite side and vaporizes. The fuel ejected into the vaporization cylinder in this way collides with the protrusions provided alternately on the side wall of the vaporization cylinder one after another and is vaporized repeatedly, and almost all of the fuel is vaporized near the exit of the vaporization cylinder. Further, the protrusions provided alternately on the side wall of the carburetor cylinder function to disturb the flow of air within the carburetor cylinder, thereby making the mixing of vaporized fuel and air sufficiently satisfactory. In addition, the above-mentioned convex portion serves as a mounting part for the vaporizer cylinder lid, effectively transmitting the heat of the vaporizer cylinder lid heated by combustion heat to the vaporizer cylinder, and increases the wall thickness of the vaporizer cylinder for attaching the vaporizer cylinder lid. This is not necessary and the wall of the vaporizer cylinder can be made thinner.

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

In FIGS. 1 to 3, reference numeral 10 denotes a vaporizing cylinder for vaporizing liquid fuel, which is formed long and thin. A fuel nozzle 11 injects liquid fuel into the vaporizer cylinder 10 and communicates with a pump 12. Reference numeral 13 denotes an air passage that guides combustion air from the blower 14 to the vaporization cylinder 10, and is open to the inlet portion 10g of the vaporization cylinder 10 together with the fuel nozzle 11. A mixing chamber 15 is provided at the outlet portion 10b of the carburetor 10 and communicates with 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 this fuel supply passage 17 is connected to the combustion chamber wall 1.
It penetrates through B and opens into the combustion chamber 19, forming a flame port 20. Here, the two combustion chamber walls 18 face each other, and the flame ports 20 face each other.The flame port 22 is a vaporizer lid that partitions between the combustion chamber 19 and the vaporizer cylinder 10, and is provided at the upper opening of the vaporizer cylinder 10. .

23 are convex portions provided alternately on both side walls of the vaporizer cylinder 10;
The vaporizer cylinder cover 22 is attached with screws 22g.

24 is a heater embedded in the vaporization cylinder 10.

The operation of the above configuration will now be described.

First, the heater 24 is energized, and when the vaporization f1210 reaches a predetermined temperature, the air blower a14 is operated and combustion air is sent to the vaporization cylinder 10 through the air passage 13. In addition, the pump 12 also operates, and fuel is supplied from the fuel nozzle 11 to the carburetor cylinder 10.
The convex portion 23fa provided on the side wall of the vaporizing cylinder 10
collides with l. At this time, the vaporization tube 10 has reached the temperature at which the fuel is vaporized, so part of the fuel that collides with the convex portion 23 (al) vaporizes.
4 to the carburetor tube 10 along with the combustion air sent to the carburetor tube 10.
0, but on the way, it collides with the protrusion 23 (bl) provided on the side wall opposite to the protrusion 23(a) and vaporizes.

The fuel ejected from the fuel nozzle 11 into the vaporization tube 1o in this way is transferred to the convex portions 2 provided alternately on the side wall of the vaporization tube 10.
Collisions one after another in 3! , in order to repeat vaporization, vaporizer cylinder 1
All the supplied fuel is vaporized near the exit of 0.

In addition, since the convex portion 23 provided on the carburetor tube 10 functions to disturb the flow of combustion air supplied from the inlet, the convex portion 23 provided on the carburetor tube 10
The vaporized fuel and combustion air in the combustion chamber 15 are sufficiently mixed, 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 a fuel supply passage 17 which is branched into many branches, and then flows through the fuel supply passage 1
It is ejected into the combustion chamber 19 from the opening 7, that is, the flame port 20. When the mixed gas exiting from the flame port 20 is ignited, a flame 21 is formed and combustion continues.

At this time, the combustion chamber wall 18 and the vaporization cylinder cover 23 are also heated by radiation from the flame 21, and the vaporization cylinder 10 is heated by the vaporization cylinder cover 23.
It is heated by heat transfer from 3. At this time, the vaporizer cylinder 10
The convex portion 23 provided on the side wall increases the heat transfer area and also receives heat transfer through the screw 22m, improving the efficiency of heat recovery. Therefore, vaporizer cylinder 1
0 at a more suitable temperature.

Effects of the Invention As described above, the present invention is capable of completely vaporizing the fuel injected into the vaporization cylinder by providing the convex portions alternately on the side wall of the vaporization cylinder, and also allows the combustion fuel to be supplied from the inlet of the vaporization cylinder. Air and vaporized fuel can be sufficiently mixed, combustion can be made stable and good, and tar generation due to unvaporized fuel can be prevented. Moreover, the heat recovery efficiency from the vaporizer cylinder lid can be improved by the above-mentioned convex part, and since the vaporizer cylinder cover is attached using this convex part, the vaporizer cylinder wall does not need to be thickened for the purpose of attaching the vaporizer cylinder lid. (There is also the advantage that it can be made thinner and the time required to heat it to the vaporization temperature can be shortened.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a liquid fuel combustion device according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the same as seen from the top, Fig. 3 is a plan view of the vaporization cylinder, and Fig. 4 is a diagram of a conventional combustion device. FIG. 10... Carburizer tube, 19... Combustion section (combustion chamber), 22... Carburizer tube cover, 23...
Convex part.

Claims (1)

[Claims] A horizontally elongated vaporizer tube with one end as an inlet for fuel and air and the other end as an outlet for mixed gas, and a combustion section arranged along the longitudinal direction of the vaporizer tube and supplied with the mixed gas from the outlet of the vaporizer tube. and a vaporizer cylinder lid that partitions the combustion section and the vaporizer cylinder, and several protrusions are provided alternately on both sides of opposing walls in the longitudinal direction of the vaporizer cylinder, and the vaporizer cylinder lid is connected to the vaporizer cylinder lid. Liquid fuel combustion device attached to the convex part.