JPH0364766B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a burner for combustion equipment.

Prior Art A conventional combustion device of this type is shown in FIG. That is, a heater 2 is provided in a bottomed cylindrical mixing cylinder 1, and a cap 5 to which a mixing plate 3 and a flame hole wire mesh 4 are fixed is placed on top of the heater 2. A blower pipe 6 is provided on the side wall of the mixing cylinder 1, and one end opens into the vaporizing cylinder 1.
The other end communicates with the blower 7 and supplies combustion air to the mixing cylinder 1.
supply within. Further, fuel such as white kerosene is injected into the mixing cylinder 1 through a pipe 9 by a pump 8. After preheating the mixing cylinder 1 to 250 to 300°C, the pump 8 and the blower 7 are driven to generate a flammable air-fuel mixture with an air ratio of 0.7 to 0.9, which is ejected from the flame hole wire mesh 4. When this combustible mixture is ignited, a primary combustion flame 10 and a secondary combustion flame 11 are formed and combusted. Pump 8 for fire extinguishing,
Stop with blower 7.

Problems to be Solved by the Invention In the conventional configuration as described above, a dark blue primary combustion flame and an almost transparent blue secondary combustion flame are formed outside the flame hole wire mesh, and the secondary combustion flame is exposed to the surrounding secondary air. This completes the combustion reaction. Nitric oxide ( _hereinafter referred to as NO), which is the main component of nitrogen oxides (hereinafter referred to as NO When this type of combustion device was deployed in indoor heating equipment, the indoor _NOx concentration increased significantly, causing health problems for the human body. In addition, ventilation can be used to reduce indoor _NOx concentration, but the need to increase the number of ventilations poses problems in terms of labor, heating efficiency, comfort, and economy.

Furthermore, in the past, the stability of the combustion flame was poor due to disturbances in the air ratio, etc., and it was easy to lift, blow out, and generate soot, and the NO _X value and CO value were likely to increase.

Since the present invention solves such conventional problems,
The purpose of the present invention is to provide a combustion device that generates less NO _x CO and achieves stable combustion and improved durability.

Means for Solving the Problems In order to solve the above problems, the combustion apparatus of the present invention includes a burner head formed into a cylindrical shape by stacking ring-shaped ceramic plates and wire mesh alternately, and the lower end of the burner head is It is fixed by the flange of the mixing cylinder, and the upper end is held by a burner cap to form a combustion surface.

Effects According to the present invention, with the above-described configuration, the primary combustion flame is dispersed in the vertical direction, and auxiliary flames are also formed on the ceramic plate, the flame is diffused, and the combustion surface temperature is lowered. The amount of _NO In addition, by dispersing the flame, the mixture with secondary air improves, and the combustion reaction proceeds smoothly.
Stable combustion that is unlikely to blow out is achieved. Furthermore, the premixture is supplied to the combustion surface through the wire mesh, which improves the mixing properties in the wire mesh.
The flow of the premixture is also made more uniform and stable, resulting in more stable combustion, and the wire mesh is not deformed or damaged, improving its durability. It has good durability and
This makes it possible to provide a combustion device with improved exhaust gas characteristics.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In FIG. 1, 21 is a cylindrical burner head, which is made of a ring-shaped porous sintered ceramic plate 22.
and wire mesh 23 are alternately stacked to form a cylindrical shape. A burner cap 24 covers the upper end of the burner head 21 and closes the upper end opening of the burner head 21. 25 is heater 2
The mixing cylinder is a die-cast molded product made of aluminum in which 6 is cast.The upper end flange part 27 covers the lower end of the burner head 21, and the burner head 21 is placed thereon. 28 is a mixing plate located at the bottom of the burner head 21 and having a constricted shape. Furthermore, 29 is a fuel nozzle, and 30 is a combustion air discharge port. Further, between the flange portion 27 and the burner cap 24 is a combustion surface 33 that forms a primary combustion flame 31 and a secondary combustion flame 32.
4 is formed.

In the above configuration, the fuel and air ejected from the fuel nozzle 29 and the air discharge port 30 become a premix in the heated mixing cylinder 25, pass through the mixing plate 28, and form a flame on the combustion surface 33 ejected from the burner head 21. , during combustion, the primary combustion flame 31 is connected to the wire mesh 23
The auxiliary flame 34 is formed nearby and divided vertically by the ceramic plate 22, and an auxiliary flame 34 is also formed on the ceramic plate, the flame is dispersed, and the temperature of the combustion surface 33 is lowered. This significantly reduces the amount of promptNO generated by combustion, and reduces the amount of _NOx generated. In addition, since the flame is dispersed, it mixes well with secondary air, allowing the combustion reaction to proceed smoothly.
Stable combustion with less CO generation and less lift and blowout can be achieved. Furthermore, since the premixture is supplied to the combustion surface 33 through the wire mesh 23, the mixing properties are improved in the wire mesh 23, and the flow of the premixture is also uniform and stabilized, resulting in more stable combustion. is obtained, combustion noise due to flame turbulence is significantly reduced, and the range of combustion amount adjustment is widened.
On the other hand, the lower end of the burner head 21 is a flange portion 2 of a mixing cylinder 25 made of die-cast aluminum with good thermal conductivity.
7, so wire mesh 23 and ceramic plate 2
2. Deformation damage and oxidation corrosion are eliminated, and high-temperature durability is improved.

Furthermore, as shown in FIG. 2 and FIG.
If the protrusion 35 protrudes further downstream of combustion, the protrusion 35 becomes red hot during combustion and has a heat dissipation effect. As a result, a portion of the premixture remains near the protrusion 35, promoting the mixing of air and fuel and the combustion reaction.
Heat dissipation increases and complete combustion is achieved by increasing the temperature of the protrusion 35 itself. As a result, a combustion device that generates less _NOx and has a wider range of stable combustion can be obtained.

Effects of the Invention As described above, the combustion apparatus of the present invention provides the following effects.

(1) As the flame disperses, the heat generated by the flame is easily conducted to the ceramic plate and mixing cylinder flange, and the temperature of the combustion surface decreases.
By significantly reducing the amount of _NO

(2) By diffusing the primary combustion flame, improving the mixability of the premixture, and making the flow more uniform, stable combustion conditions with a wide range of combustion amount adjustment and extremely low CO emissions can be achieved.

(3) There is no thermal deformation of the wire mesh or ceramic plate, and the durability is greatly improved.

(4) Because the flow of the premixture becomes uniform and stable,
The flame is stabilized and combustion noise is significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a combustion device in one embodiment of the present invention, FIGS. 2 and 3 are sectional views of main parts of a combustion device in other embodiments, and FIG. 4 is a main part of a conventional combustion device. FIG. 21... Burner head, 22... Ceramic board, 23... Wire mesh, 24... Burner cap, 2
5...Mixing tube, 27...Flange part, 33...Combustion surface, 34...Auxiliary flame, 35...Protrusion part.

Claims (1)

[Scope of Claims] 1. A burner head formed into a cylindrical shape by alternately overlapping ceramic plates made of a flat ring-shaped porous sintered body and wire mesh, the lower end of the burner head being fixed with a flange of a mixing cylinder, A combustion device in which the upper end is held between burner caps and a combustion surface is formed on the cylindrical outer peripheral surface of the burner head. 2. The ceramic plate has a circumferential outer end that protrudes further downstream than the combustion surface.
Combustion device as described in section. 3. The combustion device according to claim 1, wherein the outer circumferential end of the wire mesh protrudes further downstream of the combustion surface than the combustion surface.