JPH03168504A - Burner - Google Patents

Abstract

PURPOSE:To prevent offensive odor and to reduce NOX in a burner of a hot air room heater by forming a combustion chamber between the inner and outer cylinders of a combustion cylinder, and respectively supplying mixture gas from a Bunsen type fuel. air premixture chamber and combustion air from vent holes of the inner and outer cylinders. CONSTITUTION:Mixture gas of fuel and air is supplied from a Bunsen type fuel.air premixture chamber 10 into a combustion chamber 33 formed annularly between inner and outer cylinders 31 and 32 of a combustion cylinder 30. On the other hand, combustion air is supplied to the chamber through a vent opening 14, a vent chamber 52, vent hole of the cylinder 31, a vent opening 15, a vent chamber 51, and the vent port of the cylinder 32 by natural suction. With this structure, the mixture gas is directly burned to prevent offensive odor at the time of igniting and fire extinguishing and to reduce NOX by natural ventilation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustion device that can be used primarily for hot air heaters, and also for water heaters and bathtubs.

<Prior art and its issues> Conventionally, in wick type combustors such as wick type stoves, combustion air is dividedly supplied through natural ventilation to create a reduction combustion zone, so NO and I are generated compared to the normal Bunsen type combustor. However, since the wick sucks the fuel and burns it directly, there is a problem in that it produces a lot of odor when igniting and extinguishing the fire.

On the other hand, in a vaporizing type combustor, such as the combustion device proposed in Japanese Patent Application Laid-open No. 62-255708, in which combustion air is forcibly supplied using a fan, etc., there is relatively little odor during ignition and extinguishing. , there was a problem in that the generation of NoX was much larger than that of the core two.

Therefore, the present invention aims to eliminate the drawbacks of the above-mentioned conventional techniques and to provide a combustor that emits less odor during ignition and extinguishing and has low NOx by effectively combining the advantages of the above two types of combustor. .

Means for Solving the Problems> In order to achieve the above object, the combustion apparatus of the present invention employs a Bunsen type fuel/air preparatory system having a fuel inlet from which combustion air is naturally sucked in at the same time as fuel is injected. It consists of a mixing chamber, an annular flame hole shaped part from which the premixture from the fuel/air premixing chamber flows out, a cylinder and an outer cylinder, and between which the premixture from the flame hole shaped part is blown out. A combustion tube is provided on the inside and outside of the combustion tube, and is used to naturally draw combustion air into the combustion chamber through vent holes formed in the inner and outer tubes of the combustion tube. It is characterized by having a ventilation chamber.

<Operation> The fuel and the combustion air that is naturally sucked in as the fuel is blown are mixed in the fuel/air premixing chamber, flow out from the flame hole shaped part, and are combusted. This combustion takes place in the combustion chamber between the inner and outer cylinders, and the combustion heats the inner and outer cylinders to a red-hot state. When the inner and outer cylinders are heated to a red-hot state, combustion air is naturally drawn from the ventilation chamber through the ventilation holes in the inner and outer cylinders. Therefore, when natural suction from this ventilation chamber begins,
The fuel input can be increased to cause the flame to burn throughout the combustion chamber in lift conditions. When combustion takes place throughout the combustion chamber, most of the combustion air is provided by natural ventilation from the ventilation chamber. As a result, low NOx can be achieved. Of course, since it is not a wick type, no odor is generated when it is lit or extinguished.

Embodiments> FIG. 1 is a sectional view of an apparatus for implementing the present invention, and FIG. 2 is a plan view of a fuel/air premixing chamber. This implementation device is a combustion device that uses liquid fuel such as kerosene. The fuel/air premixing chamber IO has a fuel inlet 11 through which fuel vaporized by the vaporizer 20 is injected from a nozzle portion 21 . This fuel injection eye 11 is designed to naturally suck air for combustion at the same time as fuel is injected, and as a result, the fuel/air premixing chamber IO is of the Bunsen type. An annular flame hole-shaped restraining portion l2 is provided on the ceiling of the fuel/air premixing chamber 10, and a plurality of flame holes 13 are formed in the flame hole forming portion 12. The premixed gas in the mixing chamber 10 flows upward from the flame hole 13. A ventilation opening l4 is provided to pass through the center of the fuel/air premixing chamber 10.

The combustion tube 3 is placed on top of the fuel/air premixing chamber 10.
0 is set. The combustion cylinder 30 has an inner cylinder 31 and an outer cylinder 3.
2, with a combustion chamber 33 between the inner cylinder 31 and the outer cylinder 32.
is configured. The flame hole forming portion 12 is provided in this combustion chamber 33.
The premixture flows into the combustion chamber 33 from the flame hole l3. A glass cylinder 40 is further provided on the outside of the combustion cylinder 30 so as to surround it. The space between the outer cylinder 32 and the glass cylinder 40 and the inside of the inner cylinder 3l serve as ventilation chambers 5l and 52, respectively. A ventilation opening 14 passing through the fuel/air premixing chamber 10 communicates with the ventilation chamber 52 inside the inner cylinder 31 . Further, a ventilation opening 15 is formed at the lower end of the ventilation chamber 52 on the outside of the outer cylinder 32. Outside air enters the ventilation chambers 51, 52 through these two ventilation openings 14, 15.

Further, a large number of ventilation holes 61 are provided in the inner cylinder 31 and the outer cylinder 32.
, 62 are provided.

The vaporizer 20 is, for example, an electrically heated vaporizer, and liquid fuel is supplied into the vaporizer 20 from a liquid fuel tank 70 with a pump 80 . From the carburetor 20 to the fuel/air premixing chamber 10
A control section (not shown) controls the amount of fuel injected into the pump 80 and the heater of the carburetor 20 by controlling the pump 80 and the heater of the carburetor 20.

When the operation starts now, the vaporizer 20 is heated first. When the carburetor 20 is heated, fuel is sent by the pump 80 and vaporized. The vaporized fuel is blown into the fuel injection port 11 from the nozzle 21, and at this time, air for combustion is naturally sucked from the fuel injection port 11. The premixture mixed in the fuel/air premixing chamber 10 is passed through the flame hole 13
and is ignited by an igniter (not shown). When the inner cylinder 31 and the outer cylinder 32 become red-hot due to combustion in the flame hole 13, natural suction occurs from the ventilation chambers 51 and 52 through the ventilation holes 61 and 62. This ventilation chamber 51,
When natural suction from 52 to combustion chamber 33 is started, even if the input of fuel is increased, the necessary combustion air will be transferred to ventilation chambers 51 and 5.
Natural suction from 2 can be sufficient.

Therefore, the flame hole 13 load is set so that the flame lifts when the maximum input is 173 or more, and at the initial stage of ignition,
When the input is less than the maximum input of 173, the flame is held in the flame hole 13 and burned, and when the inner and outer tubes 31 and 32 of the combustion tube 30 become red hot, the input is gradually increased to lift the flame and burn it in the entire combustion chamber. Do it like this. By doing this, although Bunsen-style combustion is performed at the beginning of combustion, odor is prevented when igniting, etc., and odor is also prevented from being generated when extinguishing. Except for the initial stage of combustion, most of the combustion air can be obtained by natural intake from the ventilation chambers 51 and 52, and combustion can be carried out in the entire combustion chamber in a lifted state. Therefore, NO. can significantly reduce the occurrence of

Note that the fuel inlet 1 of the fuel/air premixing chamber 10 {
The diameter, etc. may be regulated in advance so that an amount of air suitable for supplying fuel during low input at the initial stage of operation is sucked.

In the embodiment, liquid fuel was vaporized, but gaseous fuel may be directly blown into the fuel/air premixing chamber 10.

Effects> The present invention has the above structure, and according to the combustion apparatus according to claim 1, premixed gas is directly combusted instead of wick combustion, so that when igniting and extinguishing, No odor is generated. In addition, except for the initial stage of ignition, combustion air can be obtained by natural intake (ventilation) from the ventilation chamber, so N
O. can significantly reduce the occurrence of

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an apparatus for carrying out the fourth embodiment of the present invention, and FIG. 1 is a plan view of a fuel/air premixing chamber. 10: Fuel/air premixing chamber 11: Fuel inlet 12: Flame hole shaped part 13: Flame hole 30: Combustion tube 3L: Inner tube 32: Outer tube 33: Combustion chamber 5152: Ventilation chambers 61, 62: Open Stomata diagram 2

Claims (1)

[Claims] (1) A Bunsen-style fuel/air premixing chamber with a fuel inlet through which combustion air is naturally sucked in at the same time as fuel is injected, and an annular shape through which the premixture from the fuel/air premixing chamber flows out. a combustion tube consisting of an inner cylinder and an outer cylinder and forming a combustion chamber between which a premixture is blown out from the flame hole formation part; A combustion device comprising: a ventilation chamber for naturally sucking combustion air into the combustion chamber from ventilation holes formed in the inner cylinder and the outer cylinder of the combustion cylinder.