JPH0120505Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device, and particularly to a combustion device of the type that pressurizes liquid fuel such as petroleum, sprays it through a nozzle, and at the same time supplies air from around the fuel to burn it.

Conventionally, this type of liquid fuel combustion device uses a diffusion combustion method, which tends to cause unburnable fuel to fly around the center, causing red flames and causing incomplete combustion. The diameter is large, and the mixture of fuel and air is a mixture of liquid and air, resulting in poor mixing, resulting in a very long flame, which requires a large combustion chamber, and tends to cause incomplete combustion, resulting in soot. Since the burner cone is mainly made of stainless steel, unburned liquid fuel attached to the burner cone decomposes and tar adheres to the burner cone surface. Since the flame is held in a turbulent state, there are drawbacks such as loud combustion noise due to flame turbulence.

The present invention aims to solve the above-mentioned problems, to achieve complete combustion or nearly complete combustion, and to reduce combustion noise.

The basic structure of the present invention to achieve the above object is that the burner cone is made of water-absorbing porous ceramic, a narrow neck is provided in the middle of the burner cone in the axial direction, and a nozzle sprays the front part of the narrow neck. The fuel spray ejected from the nozzle is expanded forward at a slightly narrower angle than the angle of the burner cone, so that the fuel spray ejected from the nozzle collides with this area, allowing unburned liquid to temporarily seep into the burner cone and causing it to burn itself. The heat of the heated cone is used to evaporate and released as steam, and a swirling vane is installed in front of the fuel spray nozzle to prevent flames from attaching to it and only direct the primary air flowing through the cone. It gives a swirl.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

2 in the figure is the burner cylinder of the gun type burner, 1
1 is a blower, and both have a conventionally known structure and form, and air necessary for combustion is supplied into the burner cylinder 2 by the blower 1.

The burner cylinder 2 has a burner cone 4 inside.

The burner cone 4 is a cylindrical body with a slightly smaller diameter than the burner cylinder 2, and is disposed coaxially with the burner cylinder 2 inside the burner cylinder 2. A gap formed between the outer peripheral surface of the burner cone 4 and the inner peripheral surface of the burner cylinder 2 allows secondary air to flow through the burner cone 4. A passage 3 is formed.

Therefore, part of the air supplied into the burner cylinder 2 by the blower 1 passes through the secondary air passage 3 and is supplied to the front end opening of the burner cone 4 as secondary air, and the rest is supplied to the burner cone 4 as primary air. flowing within.

A secondary air guide portion 8 is provided at the front end of the burner tube 2, which is formed by bending the front edge of the burner tube 2 diagonally forward inward, in order to smoothly guide the secondary air to the front end opening of the burner cone 4. The front end of the burner cone 4 is opened slightly in front of the front end of the guide portion 8.

The burner cone 4 is made of water-absorbing porous ceramic, and has a narrow neck part 7 with a narrowed diameter in the middle in the axial direction, and is formed into an enlarged part 9 whose diameter gradually increases toward the front of the narrow neck part 7. and
Inside, a fuel spray nozzle 6 and a swirling vane 5 are arranged slightly in front of the narrow neck portion 7.

The expanded portion 9 of the burner cone 4 is formed at an angle slightly narrower than the spray angle of the fuel spray nozzle 6 so that the liquid fuel sprayed from the fuel spray nozzle 6 collides with the inner surface of the expanded portion 9.

The swirling blade 5 has a large number of blade pieces arranged in an annular manner, and these blade pieces are connected to a fuel spray nozzle 6.
The burner cone 4 is mounted in front of the burner cone 4 and is arranged so as to give swirl to the primary air supplied by the blower 1 and flowing through the burner cone 4.

The fuel spray nozzle 6 is a conventionally well-known nozzle having a spray angle of about 60 degrees, and is located in front of the swirl vane 5 and faces the narrow neck 7 of the burner cone 4, and the rear part is connected to the pressure pump 11. It communicates with the oil supply source 12 via.

In the figure, 13 is an igniter, and 14 is a support piece that supports and fixes the burner cone 4 coaxially with the burner tube 2 inside the burner tube 2.

Next, the operation of this combustion device will be explained. First, primary air and secondary air are supplied from the blower 1, and then sparks are emitted from the igniter 13. When fuel is sprayed from the fuel spray nozzle 6 in this state, a mixture of the sprayed fuel and primary air is formed.
At the same time, the spark from the igniter ignites this mixture, forming a flame in the four burner cones. At this time, the primary air is given a swirl by the swirl vane behind the fuel spray nozzle 6 and is supplied, but since it is directed toward the center at the narrow neck part 7 of the burner cone, the widening part in front of the narrow neck part 7 of the burner cone is It becomes a negative pressure area. Therefore, the flame is attracted to this negative pressure area to form a flame holding area.

The flame-holding region formed here is stable and has little turbulence because it is rotated and flame-holded by the swirling of the primary air. In this way, since no turbulent flame is generated in the flame holding area, the combustion noise is quiet.

On the other hand, since the fuel is sprayed at a wider angle than the widened part 9 of the burner cone 4, it hits the burner cone 4, but since the burner cone 4 is made of water-absorbing porous ceramic, the burner cone 4
The fuel that hits the burner cone 4 once soaks into the burner cone 4.

On the other hand, the heat of the flame heats the burner cone 4, especially its widened part 9, so this soaked fuel is immediately evaporated and gasified by the heat of the heated burner cone 4, and the flame becomes an ignition source. It ignites and burns.

Further, by blowing out secondary air to the front end opening of the burner cone 4 through the secondary air passage 3, mixing of the fuel and air is promoted, resulting in complete combustion or near-complete combustion.

Since the present invention has the above configuration, it has the following advantages.

(1) The burner cone is made of water-absorbing porous ceramic, has a narrow neck part halfway in the axial direction, and expands forward from the narrow neck part at an angle slightly narrower than the spray angle of the nozzle. Therefore, the unburned liquid fuel that is sprayed from the nozzle and hits the burner cone is once absorbed inside and is evaporated and released by the heat of the burner cone heated by the combustion heat, and this evaporated fuel and fine mist form. The secondary air is mixed with the fuel, and the mixture of air and fuel becomes very good, resulting in white flame combustion with no red flame, which is close to complete combustion.

Therefore, the length of the flame is short, and the combustion chamber can be made small.

In addition, the excess air ratio can be lowered, improving combustion efficiency.

Since combustion is close to complete, soot and carbon monoxide production can be suppressed.

(2) By forming the vaporization surface that vaporizes liquid fuel with water-absorbing porous ceramic, the unburned liquid is temporarily retained inside the ceramic and then released as vapor, so there is no tar caused by the decomposition of the fuel on the cone surface. No adhesion of soot or adhesion of soot.

(3) The burner cone has a narrow neck and a swirling vane that swirls the primary air is placed in front of the narrow neck, so the swirling vane gives the primary air a swirl and the supplied primary air is directed toward the center at the narrow neck. As the area expands in front of the narrow neck, it becomes a negative pressure area, and the flame is drawn to this negative pressure area to form a flame holding area. Because the flame is held, the flame is stable, there is little turbulence, and the combustion noise is quiet.

(4) Since the burner cone is made of ceramic, it has excellent heat resistance, improves durability, and can be integrally molded, simplifying the structure.

[Brief explanation of the drawing]

The drawing is a schematic diagram of a liquid fuel combustion device showing an embodiment of the present invention. In the figure, 1...Blower fan, 2...Burner tube,
3... Secondary air passage, 4... Burner cone, 5
...Swirl vane, 6...Fuel spray nozzle, 7...
Narrow neck.

Claims (1)

[Scope of utility model registration request] A burner cylinder equipped with a blower fan at the rear, a burner cone disposed inside the burner cylinder and providing a secondary air passage between the outer circumferential surface of the burner cylinder and the inner circumferential surface of the burner cylinder, and the blower fan disposed inside the burner cone. and a fuel spray nozzle inserted into the burner cone and having a tip located in front of the swirl vane, the burner cone It is made of porous ceramic having water absorbing properties, and has a narrow neck part in the middle part in the axial direction, and the part in front of the narrow neck part is expanded forward at an angle slightly narrower than the spray angle of the nozzle, and the above-mentioned swirl vane and A liquid fuel combustion device characterized in that a fuel spray nozzle is arranged slightly in front of the narrow neck portion.