JPS58140505A - Combustion device for liquid fuel - Google Patents

Abstract

PURPOSE:To stabilize the combustion by fitting a hollow rotary member of a substantially conical shape at the side end surface on the large-diameter side of a tapered cone, and spraying minute particles of a fuel uniformly through a plurality of openings around the periphery of the rotary member. CONSTITUTION:The liquid fuel supplied on the tapered cone 23 moves toward the large-diameter side of the tapered cone 23 by a rotational centrifugal force because the tapered cone 23 has a conical shape, and then rises up along the inner surface of one end of a rotary member 22. A part of the liquid fuel is first sprayed through an opening part 22a. Further, the remaining fuel ascends along the inner surface of the rotary member, and is successively sprayed through opening parts 22b through 22d. As a result, the fuel is sprayed from the outer surface of the periphery of the rotary member 22. The sprayed minute particles are further granulated by an agitation vane 24 and sprayed toward the inner surface vaporizing part of a vaporizing cylinder 16. Accordingly, production of tar at the vaporizing part can be prevented and mixing of air and vaporized gas can be promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device, and in particular to a vaporization section thereof.

The conventional rotary type liquid fuel combustion device is 2゛
Although it has many advantages in various respects,
On the other hand, tar was deposited in the vaporization section, which had an adverse effect on combustion itself, and eventually led to a state in which combustion was impossible. A conventional example will be described below with reference to FIGS. 6 to 9.

In FIG. 6), 101 is a motor, and a rotating shaft 102 has a tapered cone 103 and a rotating plate 104 fixed to it. 10g is a liquid fuel supply port, and 106 is a vaporization cylinder. Next, the effect will be explained.

The tapered cone 103 and rotating plate 104 attached to the rotating shaft 102 of the motor 101 rotate together, and when liquid fuel is supplied from the liquid fuel supply port 105 to a part of the tapered cone 103, the liquid fuel becomes tapered. cone 103
tapered cone 1 due to the action of centrifugal force.
03, receives centrifugal force from around the rotating plate 1040, scatters, and is scattered on the inner surface of the vaporization tube 106 where it evaporates and becomes gas. However, in this example, since the rotary plate 104 is a relatively thin flat plate, the fuel is sprayed on the inner surface of the vaporization tube 106 in a linear or narrow band shape, and the fuel is sprayed on the inner surface of the vaporization tube 106 locally. This could reduce vaporization efficiency and cause tar generation. Furthermore, since it did not have a mixing plate, the mixing of air and vaporized gas was extremely poor, and red flames were likely to occur.

In the example shown in FIG. 7, a rotary blade 107 that rotates integrally with the rotary plate 104 is added to the outside of the rotary plate 104, and some of the fuel particles scattered from the rotary plate 104 are removed by the blades 107.
By stopping the receiver at step 7 and re-spraying from the outer peripheral end of the blade 107, the spreading pattern in the axial direction spreads and the blade 1
Although the fuel gas and air are mixed by the air agitation action of the blade 107, since the pattern of the particles dispersed from the rotating plate 104 is originally in the form of a thin plate, there is a limit to the action of the blade 107. Moreover, the spraying pattern varied slightly depending on the angle of the blade 107 and the surface condition, so that a consistent dispersion and dropping effect could not be obtained.

In the example shown in FIG. 8, a foamed metal having open cells is used as the rotating body, liquid fuel is supplied to the inner surface 109 of the rotating body, and liquid fuel is transferred from the outer circumferential surface of the foamed metal rotating body 108 to the rotating body 10B by centrifugal force. However, due to subtle differences in the distribution of air bubbles between individual foams and the influence of centrifugal force, in reality, air bubbles concentrate on specific parts of the outer surface. There is also a large variation in particle size. Sarak had drawbacks such as extinguishing odor and a large amount of CO generated due to the influence of oil impregnated into the foam during extinguishing.

Now, in order to prevent tar formation in the vaporization section, one measure is to make the fine particles of liquid fuel hit the vaporization surface as widely and uniformly as possible, that is, to lower the vaporization load rate on the vaporization surface, and Figure 9 shows this. This takes into account the following points.

103 is a cone, and a plurality of rotating disks 122a-1
22e are fixed at regular intervals in the axial direction of the cone 103. Furthermore, the cone 103 and the rotating disk 122a~
Openings 126b to 126e are provided at the contact portions of 122.
is the provision. 106 is a fuel supply port.

The action will be explained on page 6. Cone 10 from fuel supply port 105
The liquid fuel dropped onto the cone 103 crawls up the surface of the cone 103, and some of the fuel is scattered from the circumferential tip of the rotating disk 122e. The other fuel passes through the opening 126e/' and rises on the surface of the cone 103, gradually increasing to the rotating disk 1.
They scatter from the circumferential tips of 22d to 122a, respectively.

In this way, by using a plurality of rotating disks 122a to 122e to disperse fine particles, it is possible to prevent the production of tanyl in the vaporizing section. However, the structure of the cone 103 and the rotary disks 122a to 122e is complicated, and the dimensional accuracy of the openings 125b to 125e during assembly is difficult to achieve, making management difficult, which poses a practical problem.

The present invention solves the problems of the conventional example by expanding the dispersion width of liquid fuel and making it atomized with a simple structure.

That is, in the present invention, the liquid fuel is atomized using the centrifugal force of the rotating body, is scattered on the inner surface of the vaporization cylinder, and is gasified, and the gasified fuel is combusted in the burner section.

6.

In liquid fuel combustion equipment, the dispersion of fuel particles is expanded to prevent local temperature drop on the inside of the vaporization cylinder, preventing tar formation,
At the same time, by dividing the fuel particles into fine particles and achieving a uniform dispersion pattern, the heat of vaporization is used effectively, and the mixing of air and vaporized gas is promoted, thereby stabilizing combustion. .

The technical means of the present invention to solve this technical problem is to attach a rotary body in the shape of a hollow cone to the large-diameter end face of a tapered cone, and to uniformly distribute fuel particles through a plurality of openings provided around the rotary body. It scatters, thereby reducing the vaporization load on the inner surface of the vaporization cylinder, preventing tar formation in the vaporization section, and promoting the mixing of air and vaporized gas to stabilize combustion. .

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

In FIG. 1, reference numeral 1 denotes a cylindrical motor case, and a cylindrical inner case 2, a combustion tube 3, and a heat-resistant backing 4 are connected between the combustion tube 3 and the burner case 2. is interposed. Reference numeral 6 denotes a motor installed in the motor case 1, and one end of the rotating shaft 6 protrudes into the burner case 2 and extends to a position close to the combustion tube 3.

Further, an air intake lower is provided on the side of the motor case 1, and a plurality of communication holes 8 communicating with the inside of the burner case 2 are provided on the periphery of the end face portion on the burner case 2 side. Reference numeral 9 denotes a turbo fan that is fixedly installed in the middle of the motor shaft 6 in the burner case 2, and has multiple stages (two stages in Fig. 1). A guide blade 1o fixed to 2 is provided. The combination of these turbo fans e and guide blades 1o constitutes a blowing chamber 11, and by increasing the number of stages in the combination, static pressure can be increased. Reference numeral 12 denotes a disk-shaped partition plate fixed to the burner case 2 at an appropriate interval from the final stage guide blade 1o, and a relatively large primary air population 13 through which the rotating shaft 6 passes is provided in the center of the partition plate. Several small secondary air pockets 14 are provided at its periphery. That is, between the guide vane 10 of the final stage and the partition plate 12 is a flow division chamber 16, and the blown air that has passed through the guide vane 1° of the final stage is divided into two parts in this division chamber 16, and the =
One passes through the primary air population 13 of the partition plate 12 and becomes primary air, and the other passes through the secondary air population 14 of the partition plate 12 and becomes secondary air. 16 is the partition plate 1 inside the burner case 2
It is a cylindrical vaporizing cylinder installed in the space on the leeward side of the cylinder 2, and is made of a metal material with good thermal conductivity such as aluminum die-casting. Embedded. One end of this vaporizing cylinder 16 is attached to the partition plate 12 via a heat insulating backing (not shown), and the other end is in close contact with the burner case 2. The internal space of this vaporizing cylinder 16 is a vaporizing chamber 18 that communicates with the primary air population 13, and furthermore, between the vaporizing cylinder 16 and the burner case 2, there is a secondary air chamber 19 that communicates with the secondary air population 14. The secondary air flows into the combustion chamber 21 through the outlet 2o.

- A tapered cone 23 is attached to the tip of the rotating shaft 6 protruding into the male vaporization chamber 18, and one end of a hollow conical rotating body 22G is fixed to the large diameter end of the tapered cone 23. The other end of the rotating body 22 is an open end whose diameter gradually increases toward the smaller diameter side of the tapered cone 23. 22a~
22d is an opening provided around the rotating body 22;
In order to eject the atomized fuel evenly, the opening area should be larger as the open end has a larger diameter. In other words, 22a〈22
b (22c (22d). 24 is a stirring blade that further atomizes the fine particles ejected from the openings 22a to 22d of the rotating body 22, and also atomizes the air (second (arrow in the figure) to improve mixing.

Note that fuel is sent from a pump (not shown) through a liquid fuel supply pipe 26;
is guided slightly above the rotating shaft 6 through the branch chamber 16,
Therefore, it is bent into an inverted U shape, and its tip opening is positioned close to above the tapered cone 23. The outer periphery 12a of the primary air mass 13 provided on the partition plate 12 is formed in a tapered shape so as to slightly protrude into the vaporization chamber 18, and the 1° primary air mass 13 corresponds to the liquid fuel supply point of the tapered cone 23. It is opened towards. A burner head 27 is fixedly attached near the opening at the tip of the vaporization tube 16 facing the combustion tube 3, and has a plurality of narrow sizes. Frame rod 28
An ignition electrode 29 protrudes from the combustion tube 3.

In the above configuration, to start combustion, the sheathed heater 17 is first energized to heat the vaporization tube 16.This energization raises the temperature of the vaporization tube 16 to a set temperature sufficient to vaporize the liquid fuel. When it rises, the burner thermos (
) is turned on, the motor 6 starts, and the rotating shaft 6
With the rotation of the turbo fan 9, the tapered cone 22,
The stirring blade 24 rotates. When the turbo fan 8 generates wind pressure, the combustion air first passes through the air intake lower motor case 1 through the continuous ventilation hole 8 and the air blowing chamber 11, and then is divided into two parts in the distribution chamber 15, one of which is the primary The primary air passes through the air mass 13 and enters the vaporization chamber 18, while the other becomes secondary air which passes through the secondary air mass 14 and enters the secondary air chamber 19. Simultaneously with the start of this air blowing, the fuel pump is activated, and liquid fuel is supplied onto the tapered cone 23 through the liquid fuel supply pipe 26. Since the tapered cone 23 has a conical shape, the liquid fuel supplied onto the tapered cone 23 moves toward the larger diameter of the tapered cone 23 due to rotational centrifugal force, and then moves toward one end of the rotating body 22. It ascends the inner surface and a part of it is first scattered from the opening 22a. (In this case, since the openings 22a to 22d are arranged in four rows, the fuel should be scattered from approximately 7 to 100 openings 22a to 22d.) Furthermore, the remaining fuel should be sprayed onto the inner surface of the rotating body 22. The fuel rises and is successively scattered from the openings 22b to 22d, and as a result, all of the fuel is scattered from the peripheral outer surface of the rotating body 22. The fine particles scattered in this way are transported to the stirring blade 2.
4, and scatters toward the inner vaporization section of the vaporization tube 16.

Since the vaporization cylinder 16 has already been heated as described above, the fuel instantly vaporizes and becomes vaporized fuel. - Since primary air is sent from the primary air port 13 into the vaporization cylinder 16 to the male vaporization chamber 18, this vaporized fuel and primary air are mixed to form a mixed gas flow. The mixed gas flow passes through the burner head 27, where it is ignited by the ignition electrode 29, and a blue combustion flame A is generated in the burner head 27. Then, the combustion detection flame rod 28 detects that combustion is in progress. On the other hand, the secondary air sent to the secondary air chamber 19 passes through the outer periphery of the vaporization cylinder 16, enters the combustion chamber 21 from the secondary air outlet 2o, and contributes to combustion.

Here, in this embodiment, the opening 2 on the surface of the rotating body 22 is
A plurality of positions 2a to 22d are provided in multiple stages in the axial direction of the rotating shaft 6, and the opening area of each opening 22a to 22d is increased toward the large diameter closed end of the rotating body 22, so that the particles are placed in one location. The liquid is evenly dispersed and scattered to the vaporization section of the vaporization cylinder 16 without being concentrated in the air, and is instantaneously vaporized.

Furthermore, in this embodiment, "not only the atomization by centrifugal force as described above, but also the air from the - next air population 13 (
, solid line arrow in FIG.
2d, the ejection speed of the fine particles ejected from the openings 22a to 22d becomes higher, and atomization is further promoted.

Although the openings 22a to 22d are described as having a slit shape in the embodiment, the same effect can be achieved even within a small diameter. Furthermore, the structure of the rotating body 22 is relatively simple, and the openings 22a to 22d
Processability and dimensional control are also facilitated.

As described above, according to the present invention, in a liquid fuel combustion device that vaporizes liquid fuel particulates in a vaporization tube, one end of a hollow cone-shaped rotating body is attached to the large-diameter end face of a tapered cone, and the circumference of the rotating body is Since the fuel particles are scattered through a plurality of openings provided in the fuel cell, the following effects can be obtained.

(1) By supplying liquid fuel to the wide surface of the vaporizer cylinder,
The evaporation load on the evaporation surface can be reduced, and evaporation can be performed near the set temperature without extremely lowering the temperature of the evaporation section, so tar generation can be prevented and the life of the burner can be extended.

(2) Since the liquid fuel can be atomized, it can be mixed well with the combustion air, and combustion can be stabilized.

(3) The temperature of the vaporization section is normally set to a temperature slightly higher than the fuel evaporation temperature in consideration of the amount of heat taken away during fuel vaporization, but in the present invention, since the vaporization area is wide, the temperature of the vaporization section can be set low, the preheating time of the vaporizing section can be shortened, and steady operation can be achieved quickly.

(4) Conventionally, this type of liquid fuel combustion device has been mechanically suited for low combustion quantities, but by effectively utilizing the vaporization surface, it becomes easier to cope with high combustion quantities.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the liquid fuel combustion device of the present invention, Fig. 2 is a sectional view of the vaporizing section in the same device, Fig. 3 is a spray distribution diagram in the vaporizing section, and Fig. 4 is a sectional view of the vaporizing section in the same device. A side view of the rotating body, Figure 6 is a front view of the rotating body, Figures 6 and 7,
FIGS. 8 and 9 are configuration diagrams showing conventional examples, respectively. 15" 6...Rotating shaft, 17...Sheathed heater, 13-...Next air inlet, 16...Carburizing tube, 22...・Rotating body, 22a to 22d...
...Opening portion, 23...Tapered cone, 24
... Stirring blade, 26 ... Liquid fuel supply pipe, 27 ... Burner head. Name of agent: Patent attorney Toshio Nakao and 1 other person11
Kaisho 58-140505 (5) 1112 Figure 1113 Figure 1 @ Shinboji 1114 Figure 5 Figure 22゜16 Figure 17 Figure 2 18 Figure 9 - Vaporization strain I Kugihoshun

Claims (2)

[Claims] (1) A liquid fuel supply pipe for supplying liquid fuel is arranged near the surface of a tapered cone attached to the rotating shaft, and one end of the hollow cone-shaped rotating body is fixed to the large-diameter end surface of the tapered cone. The other end of this rotating body is made into an open end with a gradually larger diameter toward the small diameter side of the tapered cone, and a plurality of openings are provided in the axial direction around the rotating body, and vaporization is carried out through the openings. A liquid fuel combustion device configured to spray liquid fuel particles into a cylinder. (2) The liquid fuel combustion device according to claim 1, wherein the opening area of the opening increases toward the larger diameter open end.