JPH0694215A - Liquid fuel burner - Google Patents

Abstract

PURPOSE:To reduce an exhaust amount of nitrogen oxide (NOX) generated by a combustion. CONSTITUTION:Liquid fuel H to be supplied into a vaporization cylinder 4 is ignited while being scattered into a combustion chamber 7 formed of a combustion board 9 provided on an inner periphery of a combustion cylinder 8 by forced air supply from an air supply cylinder 3 to conduct a live combustion. The cylinder 4 is heated by the combustion heat due to the live combustion to vaporize the fuel H. The vaporized gas is injected from an injection port 12 formed on a sidewall 9a of the board 9 into the chamber 7 through a gas chamber 11 formed between the inner periphery of the cylinder 8 and the board 9 thereby to conduct vaporization combustion. An injection port 13 communicating with the chamber 11 is opened to be formed at least at one of an end face 7a of an outer face 7b of the opening end side of the chamber 7.

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 burns liquid fuel such as kerosene rawly and vaporizes the liquid fuel by the combustion heat to vaporize it. It is intended to reduce the emission amount of substances (NOx).

[0002]

2. Description of the Related Art Conventionally, in a liquid fuel combustion apparatus of this type (hereinafter, simply referred to as a vaporization burner), it is practically fair.
There is one having a configuration as disclosed in Japanese Patent No. 0621.

In such a conventional vaporizing burner,
As shown in FIG. 7, the outside air sucked by the blower fan 2 located on the left side of the apparatus main body 1 is forcedly blown into the bell-shaped vaporization tube 4 through the blower tube 3, and the vaporization tube 4 is blown. The liquid fuel H is attached to the tip of the rotary drive shaft of the fan 2 for synchronous rotation, and the liquid fuel H supplied through the fuel diffuser 5 provided therein is burned from the gap between the vaporization cylinder 4 and the scattering ring 6. At the same time as scattering toward the inner peripheral side wall surface 9a of the combustion plate 9 provided on the inner peripheral surface of the combustion cylinder 8 forming the chamber 7,
The igniter 10 is ignited by the arc discharge to perform raw combustion.

Then, by utilizing the combustion heat of the raw combustion, the vaporizing cylinder 4 is heated to vaporize the liquid fuel H in the vaporizing cylinder 4, and the vaporized gas is converted into the combustion cylinder 8 and the combustion disc 9. And a gas chamber 11 formed between the gas chamber 11 and the gas chamber 11 and communicated with the gas chamber 11 and jetted into the combustion chamber 7 from a jet port 12 formed in the side wall 9a of the combustion board 9 to form vaporized combustion. It is supposed to be done.

[0005]

However, in the vaporization burner having such a conventional structure, the ejection port 12 for ejecting the vaporized gas is formed only on the side wall surface 9a of the combustion disc 9. Therefore, the flame F becomes a lump, which reduces the surface area of the flame F, resulting in low heat radiation efficiency and high flame temperature.

Further, as disclosed in Japanese Utility Model Publication No. 52-45875, in the conventional vaporization burner, the combustion disc is formed in a substantially hollow cylindrical shape, and the inner and outer wall surfaces of the combustion disc are arranged in the height direction. There is a configuration in which a slit-shaped ejection port is provided along the (flame injection direction) and the flame is formed inside and outside the combustion plate. However, with such a configuration, the surface area of the flame becomes large, but Not only does the flame become a large lump, but it takes time for the combustion gas and the unburned gas newly supplied from the ejection port to leave the flame region, so the combustion gas and the unburned gas are hot. Stay in the area for a long time.

Further, as disclosed in Japanese Utility Model Publication No. 53-31458, in the conventional vaporization burner,
There is a configuration in which the combustion board is formed in a trumpet-tube shape by expanding and expanding upward (in the flame injection direction), and an opening is formed in the expanding surface. The surface area of the flame is larger than that disclosed in JP-B-52-45875, but the heat radiation efficiency is low and the flame temperature is high because it is not sufficiently large.

However, each of the above-mentioned conventional vaporization burners is developed for the purpose of stable combustion, increase of fuel amount, improvement of maintainability, etc., and nitrogen produced by combustion is generated. It did not reduce the emission of oxides (NOx).

That is, the amount of nitrogen oxides (NOx) produced increases as the combustion temperature and the oxygen concentration in the combustion region increase, and as the combustion gas and the unburned gas stay in the high temperature region for a long time. .

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid fuel combustion apparatus capable of reducing the emission amount of nitrogen oxide (NOx) generated by combustion.

[0011]

In order to achieve the above-mentioned object, the present invention performs forced air blowing from a blower cylinder, and at the same time, an inner peripheral surface of a combustion cylinder is provided with liquid fuel supplied into a rotary driving vaporization cylinder. Ignites while igniting while scattering in a combustion chamber formed by the combustion plate provided in the above, and heats the vaporizing cylinder by the combustion heat of this raw combustion to vaporize the liquid fuel, and the vaporized gas is Liquid that is vaporized and burned by ejecting the gas through a gas chamber formed between the inner peripheral surface of the combustion cylinder and the combustion plate to the combustion chamber from an ejection port formed on the side wall of the combustion plate. In the fuel combustion device, a jet port communicating with the gas chamber is formed on at least one of an end surface and an outer surface on the opening end side of the combustion chamber.

[0012]

That is, according to the present invention, by adopting the above-mentioned configuration, the gas chamber can be provided in at least one of the end surface and the outer surface on the opening end side of the combustion chamber together with the jet port formed on the side wall surface of the combustion plate. In order to form a communicating jet,
The flame is split into a split flame without becoming a lump like before, which increases the surface area of the flame,
As the heat radiation efficiency increases, the flame temperature decreases.

Moreover, since the flame becomes a plurality of independent small flames, the combustion gas and the unburned gas newly supplied from the ejection port are rapidly separated from the flame region, and the combustion gas and the unburned gas are heated to a high temperature. The time to stay in the area is shortened.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the illustrated embodiments. In the illustrated embodiment according to the present invention, the same parts as those of the conventional device shown in FIG.

FIG. 1 shows a first embodiment of a vaporization burner (liquid fuel combustion apparatus) according to the present invention. The end surface 7a of the apparatus body 1 on the open end side of the combustion chamber 7 communicates with a gas chamber 11. The jet nozzle 13 has an opening.

FIG. 2 shows a state in which the apparatus body 1 described above is installed horizontally so as to face the inside of the combustion chamber 21 of the boiler can body 20.

FIG. 3 shows a second embodiment according to the present invention, in which the outer surface 7b of the combustion chamber 7 of the apparatus body 1 on the open end side.
In addition, the jet port 14 communicating with the gas chamber 11 is formed as an opening.

Further, FIG. 4 shows a third embodiment according to the present invention, in which the gas chamber 11 is communicated with both the end surface 7a on the opening end side of the combustion chamber 7 of the apparatus body 1 and the outer surface 7b. 5 has a structure in which the respective jet outlets 13 and 14 are formed as openings, and in FIG. 5, the apparatus main body 1 is of a horizontal type like the above-mentioned FIG. 2 and is exposed to the inside of the combustion chamber 21 of the boiler can body 20. It shows a state in which it is mounted by being attached.

However, according to the above-mentioned structure of the present invention, the end surface 7a on the open end side of the combustion chamber 7 and the outer surface 7b.
Since the jet outlets 13 and 14 are formed in at least one of the above, the jet outlets 12 formed in the side wall surface 9a of the combustion board 9 are introduced into the gas chamber 11 through the jet outlets 12, 13, and 14. The introduced vaporized gas is ejected from inside the combustion chamber 7 and from the end face 7a or the outer face 7b on the side of the open end of the combustion chamber 7, and the flame F thereof is divided into small flames. It is possible to inject into 20 combustion chambers 21 independently.

FIG. 6 shows the discharge amount of nitrogen oxides (NOx) produced by the combustion of the vaporization burner according to the present invention as compared with the conventional vaporization burner.
(B) and (c) show the discharge amounts in the first, second and third embodiments of the vaporization burner according to the present invention,
(D) shows the discharge amount of the conventional vaporization burner.

In the above embodiment, when the apparatus main body 1 was mounted on the boiler can 20, it was used as a horizontal type, but it goes without saying that it can also be used as a vertical type.

[0022]

As is apparent from the above description, according to the present invention, at least one of the end surface and the outer surface on the open end side of the combustion chamber is provided with the jet port formed on the side wall surface of the combustion plate,
Since the ejection port that communicates with the gas chamber is formed, the flame is divided without becoming a lump and becomes a divided flame, which can increase the surface area of the flame and increase the heat radiation efficiency. Therefore, the thermal efficiency can be increased and the flame temperature can be lowered, so that the emission amount of nitrogen oxides (NOx) generated by the combustion can be reduced.

Further, since the flame becomes a plurality of independent small flames, the combustion gas and the unburned gas newly supplied from the ejection port are rapidly separated from the flame region, and the combustion gas and the unburned gas are heated to a high temperature. The residence time in the region can be shortened, which can further help reduce the emission amount of nitrogen oxides (NOx).

[Brief description of drawings]

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

FIG. 2 is a schematic cross-sectional view showing how the same is attached to a boiler can.

FIG. 3 is a schematic cross-sectional view of a main part showing a second embodiment of the liquid fuel combustion apparatus according to the present invention.

FIG. 4 is a schematic cross-sectional view of a main part showing a third embodiment of the liquid fuel combustion apparatus according to the present invention.

FIG. 5 is a schematic cross-sectional view showing how the same is attached to a boiler can.

FIG. 6 is an explanatory view showing a discharge amount of nitrogen oxides (NOx) in each embodiment of the liquid fuel combustion apparatus according to the present invention in comparison with a conventional liquid fuel combustion apparatus.

FIG. 7 is a schematic cross-sectional view showing a conventional liquid fuel combustion device.

[Explanation of symbols]

1 ... Device body, 2 ... Blower fan, 3 ... Blower cylinder, 4
…… Vaporization cylinder, 5 …… Fuel diffuser, 6 …… Spring ring, 7
... combustion chamber, 7a ... end face, 7b ... outside face, 8 ... combustion cylinder, 9 ... combustion plate, 9a ... side wall face, 11 ... gas chamber, 12,13,14 ... spout port, H: Liquid fuel, F
……flame.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Kishi 1370 Nishiyama-cho, Hamamatsu City, Shizuoka Prefecture Inside Yamaha Living Tech Co., Ltd.

Claims (3)

[Claims] Claims: 1. Forced air is blown from a blower cylinder, and liquid fuel supplied into a rotary drive vaporization cylinder is ignited while being scattered into a combustion chamber formed by a combustion plate provided on the inner peripheral surface of the combustion cylinder. Gas is formed between the inner peripheral surface of the combustion cylinder and the combustion plate by causing the liquid combustion to be vaporized by heating the vaporization cylinder by the combustion heat of the raw combustion. In a liquid fuel combustion apparatus that causes vaporized combustion by ejecting into the combustion chamber from an ejection port formed on the side wall surface of the combustion plate through the chamber, an end surface on the opening end side of the combustion chamber, A liquid fuel combustion apparatus, characterized in that an ejection port communicating with the gas chamber is formed. 2. Forced air is blown from a blower cylinder, and liquid fuel supplied into a rotary driving vaporization cylinder is ignited while being scattered into a combustion chamber formed by a combustion plate provided on the inner peripheral surface of the combustion cylinder. Gas is formed between the inner peripheral surface of the combustion cylinder and the combustion plate by causing the liquid combustion to be vaporized by heating the vaporization cylinder by the combustion heat of the raw combustion. In a liquid fuel combustion apparatus in which vaporized combustion is performed by ejecting the gas into a combustion chamber from a jet port formed on a side wall surface of the combustion chamber after passing through the chamber, an outer surface on the opening end side of the combustion chamber is formed. A liquid fuel combustion apparatus, characterized in that an ejection port communicating with the gas chamber is formed. 3. Forced air is blown from a blower cylinder, and liquid fuel supplied into a rotary drive vaporization cylinder is scattered and ignited in a combustion chamber formed by a combustion plate provided on the inner peripheral surface of the combustion cylinder. Gas is formed between the inner peripheral surface of the combustion cylinder and the combustion plate by causing the liquid combustion to be vaporized by heating the vaporization cylinder by the combustion heat of the raw combustion. In a liquid fuel combustion apparatus in which vaporized combustion is performed by ejecting the gas into a combustion chamber from a jet port formed on a side wall surface of the combustion plate after passing through the chamber, A liquid fuel combustion apparatus, characterized in that an ejection port communicating with the gas chamber is formed on the side surface.