JPH0749104A - Liquid fuel combustion apparatus - Google Patents

Abstract

PURPOSE:To obtain a mixed gas with stability in a combustion apparatus for burning a mixed gas of a liquid fuel. CONSTITUTION:The title apparatus comprises a vaporizing body 22 heated by a heater 21, many projected pins 23 formed integrally with this vaporizing body 22, an oil feeding pump 3 for jetting fuel directly against these pins 23 and a fuel fan 4. And, by executing a direct feeding of a liquid fuel and combustion air to the projected pins 23 having decreased vaporization load, an instantaneous gasification and vaporization can be finished. As a result, a stable gasification and an uniform mixed gas can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion apparatus which vaporizes liquid fuel, mixes it with combustion air, and burns the mixture.

[0002]

2. Description of the Related Art A conventional liquid fuel combustion apparatus of this type is shown in FIG.
As shown in FIG. 2, the oil supply port 5 and the air supply port 6 connected to the oil supply pump 3 and the combustion fan 4, respectively, are provided on the side wall of the bottomed vaporization cylinder 2 heated by the heater 1. A large number of protrusions 7 are formed on the bottom surface of the vaporization cylinder 2,
Further, the burner head 1 in which a mixing plate 9 having a mixture passage 8 and a flame port 10 are formed in the upper opening of the vaporizing cylinder 2
1, the vaporization cylinder 2 and the mixing plate 9 define a vaporization chamber 12, and the mixing plate 9 and the burner head 11 define a mixing chamber 13.

In the above structure, the heater 1 is energized,
When the vaporization cylinder 2 is heated to a predetermined temperature, the oil supply pump 3 and the combustion fan 4 operate to supply the liquid fuel and the combustion air to the vaporization chamber 12. The liquid fuel that has entered the vaporization chamber 12 collides with the inner wall surface of the vaporization cylinder 2 that is kept at a temperature above the film boiling temperature of the fuel, and the fine particles that have been split and scattered are vaporized in the recesses between the projections 7 formed on the bottom surface, It is mixed with combustion air and enters the mixing chamber 13 through the mixture passage 8. The air-fuel mixture that has been evenly mixed in the mixing chamber 13 is jetted from the flame port 10 of the burner head 11 and ignited by an ignition device (not shown) to perform combustion. (For example, Japanese Patent Application No. 58-246017)

[0004]

However, the above-mentioned structure has the following problems. For the purpose of preventing the generation and adhesion of tar, film boiling vaporization in which the vaporization cylinder 2 is heated above the film boiling temperature of the liquid fuel is basically used. In this case, between the heating surface of the vaporization cylinder 2 and the liquid fuel. Since a vapor film is formed and the evaporation rate of fuel becomes slower, the excess air ratio of the air-fuel mixture injected from the flame port 10 becomes high at the time of ignition, which causes ignition delay and induces the generation of unburned gas, resulting in ignition white. Causes smoke.

[0005] Further, it collides with the inner wall surface of the vaporization cylinder 2 and is split /
The scattered fine particles do not always fall on the bottom surface of the vaporization cylinder 2, and they fly out from the mixture passage 8 above the vaporization cylinder 2 to become an irregular vaporization state, causing yellow fire combustion and pulsating combustion, and stable combustion. I can't get the status.

The present invention solves the above-mentioned conventional problems. By reducing the vaporization load in the vaporization chamber as much as possible and instantaneously completing vaporization / evaporation, a stable vaporization state without vaporization delay can be obtained. The purpose is to obtain an efficient mixed state by supplying combustion air.

[0007]

In order to achieve the above object, the liquid fuel combustion apparatus of the present invention has the following constitution.

That is, a vaporization cylinder having a vaporized body heated by a heater and a large number of projecting pins integrally formed with the vaporized body, a fuel supply means for directly supplying to the projecting pins, and a combustion air supply means. It consists of

[0009]

According to the present invention, since the vaporization load is reduced as much as possible by the above-described structure, a large number of protruding pins having an increased vaporization area serve as vaporization surfaces, and vaporization / evaporation can be completed instantly. Generation of unburned gas disappeared,
It is possible to prevent ignition white smoke and generation of fuel particles.

Further, since the combustion air is directly supplied between the protruding pins having a large vaporization area, efficient mixing promotion which has not been achieved in the past can be achieved, and a stable combustion state without yellow flame combustion or pulsating combustion can be obtained. be able to.

Further, since uniform mixing can be carried out evenly, the generation and adhesion of tar can be prevented.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The same members as those in FIG. 3 are designated by the same reference numerals.

1 and 2, a vaporizer 22 heated by a heater 21 is provided on a side wall of a bottomed vaporizer cylinder 2,
A large number of projection pins 23 integrally formed with the vaporization body 22 in a plurality of rows are joined, and the oil supply pump 3 and the combustion fan 4 are provided on the opposite side walls of the vaporization cylinder 2 so as to be directly supplied to the projection pins 23. An oil supply port 5 and an air supply port 6 which are respectively connected to the above are provided. Further, a mixing plate 9 having an air-fuel mixture passage 8 and a burner head 11 having a flame port 10 are disposed in the upper opening of the vaporization cylinder 2
The vaporizing chamber 12 is defined by the mixing plate 9 and the mixing chamber 13 is defined by the mixing plate 9 and the burner head 11.

In the above structure, when the heater 21 is energized and the vaporizer 22, the projecting pin 23, and the vaporizer cylinder 2 are heated to a predetermined temperature, the oil supply pump 3 and the combustion fan 4 are activated to operate the liquid fuel and the combustion. Air for vaporizing room 12
Supply to. The liquid fuel that has entered the vaporization chamber 12 directly collides with a large number of protrusion pins 23 formed in a plurality of rows, and at the same time, the vaporization load is reduced as much as possible, so the protrusion pins 23 having an increased vaporization area are vaporization surfaces. Therefore, vaporization and evaporation are completed instantly. Therefore, generation of unburned gas due to vaporization delay is eliminated, ignition white smoke and generation of fuel particles can be prevented, and a stable vaporized state can be continued.

Further, the combustion air as well as the liquid fuel is directly supplied between the projecting pins 23 having a large vaporization area, so that it efficiently acts to promote the mixing and the uniform air-fuel mixture is supplied to the mixing chamber 13. it can. As a result, yellow fire burning,
It is possible to obtain a stable combustion state without pulsating combustion, and further to make the structure of the mixing space small and compact.

Further, since uniform mixing can be carried out evenly, the generation and adhesion of tar can be prevented, and as a result, it is possible to obtain a long-lived liquid fuel combustion apparatus that does not generate odor.

As shown in FIG. 2, the projecting pins 23 are formed of high density pins having a height of 10 mm or more and a pitch of 3 mm or less, and the effect of reducing the vaporization load is remarkable.

Although FIG. 2 shows the case where the prismatic pins are arranged in alignment as the pins, the pin is not limited to this and may be circular or conical. The density of the vaporized body may be different between the peripheral portion and the central portion.

[0019]

As described in the above embodiments, the liquid fuel combustion apparatus of the present invention has the following effects.

(1) In order to reduce the vaporization load as much as possible, the protruding pin having an increased vaporization area is the vaporization surface,
Since the evaporation can be completed, as a result, the generation of unburned gas due to the delay in vaporization is eliminated, the ignition white smoke and the generation of fuel particles can be prevented, and the stable vaporized state can be continued.

(2) Since the combustion air as well as the liquid fuel is directly supplied between the projecting pins having a large vaporization area, it efficiently acts to promote mixing, and a uniform air-fuel mixture can be obtained. It is possible to obtain a stable combustion state without fire combustion or pulsating combustion, and further to make the structure of the mixing space small and compact.

(3) Further, since uniform mixing can be carried out evenly, the generation and adhesion of tar can be prevented, and as a result, it is possible to obtain a long-life liquid fuel combustion apparatus that does not generate odor.

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid fuel combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a vaporization body and a projection pin of the liquid fuel combustion apparatus.

FIG. 3 is a sectional view of a conventional liquid fuel combustion device.

[Explanation of symbols]

 2 vaporization cylinder 3 refueling pump (fuel supply means) 4 combustion fan (combustion air supply means) 21 heater 22 vaporizer 23 projection pin

Claims (1)

[Claims] 1. A vaporization cylinder having a vaporized body heated by a heater and a large number of protrusion pins formed integrally with the vaporized body, a fuel supply means for directly supplying to the protrusion pins, and a combustion air supply means. A liquid fuel combustion device comprising: