JPH05141625A - Liquid fuel burner - Google Patents

Abstract

PURPOSE:To obtain a liquid fuel burner which gasifies liquid fuels such as petroleum and burns the gasified liquid fuels. CONSTITUTION:A liquid fuel (a) and a combustion air (b) are supplied. A burner head 12 is installed to the upper part of an opening peripheral edge 2c of a vaporizer 2 which uses an electric heater 8 to gasify the liquid fuel. A cylinder- shaped and tip-pointed air shielding member 13 is mounted to a burner holding fitting 14 which presses the burner head 12. A secondary air is not introduced directly into the root of flames so as to inhibit the generation of NOx. Furthermore, the heat of the cylinder-shaped air shielding member 13 is transmitted to the vaporizer 2, thereby reducing the power consumption of the electric heater 8.

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 for vaporizing and burning liquid fuel such as kerosene.

[0002]

2. Description of the Related Art Conventionally used thin liquid fuel combustion devices include, for example, one side of a burner body having a vaporization chamber formed therein, and an air port for supplying combustion air to the vaporization chamber and a fuel for dropping the fuel. A fuel nozzle is provided so that the mixed gas generated in the vaporization chamber is ejected from the flame holes of a horizontally long burner plate mounted on the upper portion of the burner body and burned (see Japanese Utility Model Publication No. 59-13452).

[0003]

However, in this horizontally long liquid fuel combustion apparatus, the fuel is intensively dropped on the bottom surface of a part of the vaporization chamber and immediately reaches the vaporization surface, so that the non-vaporized droplets are burned. Although it is not carried by air and directly ejected from the flame holes, the heating surface is not used effectively and vaporization of some fuel is delayed, so the vaporization capacity tends to be insufficient. , Tar easily adheres. Therefore, the vaporizer must be heated sufficiently, and the power consumption of the electric heater is high. In particular, the fact that secondary air or external air enters from the root of the flame has a drawback that it causes generation of thermal NOx (nitrogen oxide) by giving extra air (mostly N ₂ ) to the flame. there were. In addition, the high flame temperature also caused the generation of NOx.

In view of the above situation, it is an object of the present invention to provide a liquid fuel combustion apparatus which solves the above problems by suppressing the generation of NOx while reducing the power consumption of an electric heater. ..

[0005]

According to the present invention, a liquid fuel and combustion air are supplied, the liquid fuel is vaporized by an electric heater, and a vaporizer having an opening at the top, and an opening of the vaporizer are provided. A burner head that is provided to burn a mixed gas of vaporized fuel and combustion air that has been vaporized by a vaporizer, a burner holding metal fitting that is attached to the peripheral edge of the opening of the vaporizer and that suppresses the peripheral edge of the burner head, and this burner holding It is provided with a tapered cylindrical wind shield member extending upward from the metal fitting.

Also, liquid fuel and combustion air are supplied,
A vaporizer having an opening at the top and a burner head that is provided at the opening of the vaporizer and burns a mixed gas of vaporized fuel vaporized by the vaporizer and combustion air while vaporizing liquid fuel with an electric heater. A burner holding metal fitting that is attached to the peripheral edge of the opening of the vaporizer and holds down the peripheral edge of the burner head, and is attached to this burner holding metal, and
And a heat radiation plate located on the burner head.

[0007]

As described above, since the flame surrounding the flame rising from the burner head is surrounded by a ring-shaped wall and the upper part of the wall is bent inward to taper, the external air and the secondary air are flame It is prevented from entering from the side (root) of the. Of course, it does not come in the form of being rolled up from the upper part, so that the generation of NOx is suppressed. Moreover, since the heat of the flame is transmitted to the carburetor through the tubular wind shield member and the burner holding metal fitting, the power consumption of the electric heater is reduced.

Further, by inserting the heat radiation plate on the burner head so as to be in contact with the vaporizer, the amount of heat back to the vaporizer can be increased by utilizing the heat radiation from the heat radiation plate. No, lower flame temperature, NO
The occurrence of x can be suppressed.

[0009]

The present invention will be described below with reference to the drawings of the embodiments.

FIGS. 1 to 4 show a liquid fuel combustion apparatus of a type in which secondary air supply is not applied to the flame root, and 1 is a burner case in which a carburetor 2 serving as a burner body is arranged. A blower 4 made of sirocco fan provided with an air inlet 3 at one end is arranged below 1, and a ventilation pipe 5 connected to the blower 4 is connected to an air nozzle 6 attached to one end of the carburetor 2. A fuel nozzle 7 connected to an electromagnetic pump (not shown) faces the center of the air nozzle 6. The vaporizer 2 has a structure in which the upper portion is an opening 2a and the bottom surface 2b is inclined upward, and an electric heater 8 is embedded around the upper portion. Reference numeral 9 denotes a first straightening vane fitted and laid in the opening 2a of the carburetor 2 and having an inflow port 10 at one end. A net-shaped second straightening vane 11 is arranged above the first straightening vane 9. The burner head 12 attached to the carburetor opening peripheral portion 2c is located at the top. Reference numeral 13 denotes a tapered cylindrical wind shielding member serving as a NOx suppressing metal fitting, which is placed on the upper part of the burner head 12 via a burner holding metal fitting 14 which also serves as heat recovery. The structure is placed on the upper portion of the opening peripheral edge portion 2c to improve heat transfer. Reference numeral 15 is an ignition plug whose tip bypasses the tubular wind-shielding member 13 and is brought close to the surface of the burner head 12.
Reference numeral 6 denotes a secondary air supply port formed in the peripheral wall of the air nozzle 6, and the tip of a ventilation passage 17 in the burner case 1 communicating with the secondary air supply port 16 is exposed to the outside of one end of the carburetor 2. The secondary air c is made to follow the outer peripheral wall of the tubular wind-shielding member 13, and the liquid fuel combustion apparatus 18 is constructed with these overall configurations.

The operation will be described. First, when the liquid fuel combustion apparatus 18 is operated, the electric heater 8 is energized to raise the vaporizer 2 to a predetermined temperature, and when the vaporizer 2 reaches the predetermined temperature, the blower 4 is driven. And start a fuel pump (not shown). In order to maintain this combustion, it is important to always maintain the vaporizer 2 at the vaporization temperature of liquid fuel (petroleum) or higher (about 260 ° C.).

Here, the liquid fuel a, which becomes petroleum, is ejected from the fuel nozzle 7 into the vaporizer 2, and the vaporizer 2 is fed from the blower 4 from the air nozzle 6 located around the outer periphery of the fuel nozzle 7. The primary air b flows in, and the primary air b and the liquid fuel a become a mixed gas d and come into contact with the upper inclined bottom surface 2b of the carburetor 2 to become a vaporized gas. This vaporized gas reaches the burner head 12 from the inflow port 10 of the first straightening vane 9 through the second straightening vane 11, and is burned by the ignition of the spark plug 15 arranged at the position of the burner head 12.

In this case, since the cylindrical wind-shielding member 13 having the tapered wall 13b serving as a ring-shaped wall is located around the flame rising by the burner head 12, the air nozzle 6 is used.
The secondary air c branched off from and blown out does not reach the root of the flame directly, so that NOx generation due to combustion is suppressed. Further, the cylindrical wind shield member 13 and the burner holding metal fitting 14 are heated by a flame, and the heat is conducted to the carburetor opening peripheral portion 2c which is in direct contact with the lower portion, so-called a heat bag is formed to warm the carburetor 2 itself. It is also possible to suppress the power consumption of the electric heater 8 arranged in the vaporizer 2.

5 to 10 show another embodiment of a liquid fuel combustion apparatus in which a heat radiating plate is arranged above the burner head. This is a structure in which the lower end of the leg portion 19a of the heat radiation plate 19 serving as a NOx suppressing heat radiation plate standing upright in the upper center of the burner head 12 is fixed to the location of the burner holding metal fitting 14 that presses the peripheral edge portion of the burner head 12. This heat radiation plate 1
The structure of No. 9 is one in which one plate is formed into a folded folded body 19A as shown in FIGS. 7 and 8, or a flat folded plate is punched into a folded piece as shown in FIGS. 9 and 10. What was formed in the uneven plate body 19B having 19c is used. In this case, the configurations of the carburetor 2, the electric heater 8, the air nozzle 6, the fuel nozzle 7, the blower 4 and the like located below the burner head 12 are the same as those in the above embodiment, and the same reference numerals are used.

Here, the mixed gas d of the liquid fuel a and the air b, which has flowed into the vaporizer 2 in the same manner as described above, rises above the burner head 12 and is burned by the ignition of the ignition plug 15. The heat radiating plate 19 made of a heat-resistant metal or ceramic is heated in the flame rising from the burner head 12, and since the heat radiating plate 19 extends upward, heat is radiated and the flame temperature is lowered accordingly. This means that NOx can be suppressed if the flame temperature drops. At the same time, the heat transmitted to the heat radiating plate 19 is conducted to the vaporizer 2 from the burner holding metal fitting 14 via the leg portions 19a, thereby increasing the amount of heat recovery by warming the vaporizer 2 and Moreover, it becomes possible to suppress the power consumption of the electric heater 8 for heating the vaporizer 2.

[0016]

As described above, in the liquid fuel combustion apparatus of the present invention, the tapered cylindrical wind shield member or the leg portion of the heat radiation plate arranged above the flame is attached to the burner holding metal fitting provided on the burner head. By doing so, it is possible to easily supply the secondary air, which is a factor of NOx generation, to the root of the flame and to lower the temperature of the flame, and to obtain combustion that does not cause NOx. Moreover, since the lower ends of the tubular wind shield member and the heat radiation plate are in contact with the burner holding metal fittings, a part of the heat generated by heating is transferred to the vaporizer holding the burner head to heat the vaporizer. It also has the effect of reducing the power consumption of the heater.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a perspective view of a tubular wind shield member.

FIG. 4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a schematic view of another embodiment using a heat radiation plate.

FIG. 6 is a side view of the same.

FIG. 7 is a perspective view of a foldable heat radiation plate.

FIG. 8 is a cross-sectional view taken along the line AA of FIG.

FIG. 9 is a perspective view of an uneven plate type heat radiation plate.

FIG. 10 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 2 Vaporizer 2a Opening 2c Opening peripheral part 8 Electric heater 12 Burner head 13 Cylindrical wind shielding member 14 Burner holding metal fitting 19 Heat radiating plate a Liquid fuel b Primary air d Mixed gas

Claims (2)

[Claims] 1. A liquid fuel and combustion air are supplied, the liquid fuel is vaporized by an electric heater, and a vaporizer having an opening at its upper part and an vaporizer provided at the opening of the vaporizer are vaporized by the vaporizer. A burner head for burning a mixed gas of vaporized fuel and combustion air, a burner holding fitting attached to the peripheral edge of the opening of the carburetor to suppress the peripheral edge of the burner head, and a tapered tube extending upward from the burner holding bracket. Liquid fuel combustion device, comprising: 2. A liquid fuel and combustion air are supplied, the liquid fuel is vaporized by an electric heater, and a vaporizer having an opening in the upper portion, and a vaporizer provided in the opening of the vaporizer and vaporized by the vaporizer. Burner head for burning a mixed gas of vaporized fuel and combustion air, a burner holding fitting attached to the peripheral edge of the opening of the carburetor to suppress the peripheral edge of the burner head, and a burner holding fitting attached to this burner holding fitting. A liquid fuel combustion apparatus, comprising: a heat radiation plate located on the head.