JPH05141627A - 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 which uses an electric heater 8 to gasify the liquid fuel (a). A burner fixing fitting 13 which presses the burner head 12 is designed based on a two stage throttling structure which comprises a first ring-shaped section 14 and a first cylinder-shaped section 15, and a second ring-shaped section 16 and a second cylinder-shaped section 17. The second ring-shaped section 16 serves to enhance the thermal conductivity to the opening peripheral edge 2c of the vaporizer. The second cylinder-shaped section 17 which rises to the top serves to prevent an open air and a secondary air from being mixed to the root of flames.

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 causes the generation of thermal NOx (nitrogen oxide) by adding extra air (mostly N ₂ ) to the flame. was there. 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 the 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 at the same time, a vaporizer having an opening at the top and an opening of the vaporizer are provided. A plate-shaped burner head that is attached and burns a mixed gas of vaporized fuel and combustion air that has been vaporized by a vaporizer, a first annular portion that is in contact with a peripheral portion of the burner head, and an outer peripheral edge of the first annular portion A first tubular portion that is erected upward from the first tubular portion, a second annular portion that extends outward from an upper end of the first tubular portion and that contacts the opening peripheral portion of the carburetor, and the second tubular portion.
And a metal member integrally having a second tubular portion that rises upward from the outer peripheral edge of the annular portion.

Also, liquid fuel and combustion air are supplied,
A liquid fuel vaporizes with an electric heater, and a vaporizer with an opening at the top, and a flat plate that is attached to the vaporizer's opening and burns a mixed gas of vaporized fuel vaporized by the vaporizer and combustion air. Of the burner head, a first annular portion in contact with the peripheral portion of the burner head, a first tubular portion raised upward from the outer peripheral edge of the first annular portion, the first annular portion
A second annular portion that extends outward from the upper end of the tubular portion and is in contact with the opening peripheral edge portion of the carburetor, and a second tubular portion that rises upward from the outer peripheral edge of the second annular portion are integrally provided. A metal member is provided, and black heat-resistant paint is applied to the inner wall of the vaporizer facing the first tubular portion.

[0007]

As described above, the burner head is pressed by the bottom portion of the burner fixing bracket, and the heat of the flame is radiated back to the vaporizer by the side surface of the first stage of the two-stage throttle. Start up at a position close to and prevent external air or secondary air from mixing into the root of the flame. Further, a black heat-resistant paint is applied to the inner surface of the vaporizer, which corresponds to the back surface of the side surface of the first stage, to improve absorption of radiant heat from the metal fitting.

[0008]

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 using a two-stage throttle burner fixing metal fitting, and 1 is a burner case in which a rectangular vaporizer 2 made of a material having good heat conduction is disposed. Below the burner case 1, there is an air inlet 3 at one end.
A sirocco-fan type blower 4 provided with the air blower 4 is arranged, a ventilation pipe 5 connected to the blower 4 is connected to an air nozzle 6 attached to one end of the carburetor 2, and an electromagnetic pump is provided at the center of the air nozzle 6. Fuel nozzle 7 connected to (not shown)
Is facing. The vaporizer 2 has a structure in which the upper portion has an opening 2a, the bottom surface 2b has an upward slope, and a convex portion 2c is arranged in the middle, and an electric heater 8 is embedded around the upper portion. Reference numeral 9 denotes a first straightening vane fitted with an opening 2a of the vaporizer 2 and having an inflow port 10 having a downward slope, and a punch metal-like second straightening vane 11 is arranged on the upper part of the first straightening vane 9. Further, the burner head 12 arranged so as to close the opening 2a at the carburetor opening peripheral portion 2d at the uppermost position is positioned. Reference numeral 13 denotes a first portion that contacts the peripheral portion 12a of the burner head 12 with screws around the periphery.
The annular portion 14, the first tubular portion 15 that is erected upward from the outer peripheral edge of the first annular portion 14, and the opening peripheral edge portion of the carburetor 2 that extends outward from the upper end of the first tubular portion 15. It is a metal burner fixing metal fitting of a two-stage drawing as a whole, which has a second annular portion 16 that comes into contact with 2d and a second tubular portion 17 that rises upward from the outer peripheral edge of the second annular portion 16. Reference numeral 18 is an ignition plug whose tip is directed to the surface of the burner head 12, and 19 is a secondary air supply port formed in the peripheral wall of the air nozzle 6, which is a ventilation inside the burner case 1 communicating with the secondary air supply port 19. Road 20
Of the vaporizer 2 faces the other end of the vaporizer 2. Reference numeral 21 is a black heat-resistant paint applied to the inner surface of the carburetor, which corresponds to the back surface of the side surface of the first stage of the burner fixing member 13, and serves as a liquid fuel combustion device 22 with the above-mentioned overall configuration.

The operation will be described. First, when the liquid fuel combustion device 22 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).

Here, the liquid fuel (petroleum) a is ejected from the fuel nozzle 7 into the carburetor 2, and the primary air b fed from the blower 4 flows in from the air nozzle 6 around the outer periphery of the fuel nozzle 7. The mixed gas d made up of the primary air b and the liquid fuel a comes into contact with the ascending bottom surface 2b of the vaporizer 2 and is vaporized. In this case, the passage of the mixed gas d is gradually narrowed by the upwardly sloping bottom surface 2b and the downwardly sloping first straightening plate 9, so that the mixed gas d having a high flow velocity collides with the convex portion 2c and is vaporized. The vaporized liquid fuel a is mixed with the supplied primary air b to disturb the flow by the baffle plate 23 of the inflow port 10 of the first straightening vane 9, and then a large number of small holes 24 provided in the second straightening vane 11 are provided. After being mixed well, it reaches the burner head 12 and is ignited by the spark plug 18 at the burner head 12 to start combustion. In this way, the mixing of the combustion air and the vaporized fuel becomes good, so that local red fire and CO are rarely generated.

On the other hand, the burner fixing metal fitting 13 holds down the burner head 12 by the bottom portion (first annular portion 14) and radiates the heat of the flame rising at the first side surface (first cylindrical portion 15) of the two-stage throttle. To heat-back (heat recovery) to the opening peripheral edge 2d of the vaporizer 2 to improve heat conduction to the vaporizer opening peripheral edge 2c at the second annular portion 16, and further to the second stage at a position close to the flame. The start-up (the second tubular portion 17) and the mixing of the external air or the secondary air c into the root of the flame are prevented. Also,
Since the black heat-resistant paint 21 is applied to the inner surface 2e of the vaporizer that hits the back surface of the side surface of the first stage, the radiant heat from the burner fixing fitting 13 is absorbed well. Therefore, the burner fixing bracket 1
Heat conduction from 3 promotes heat back to the vaporizer 2.

5 and 6 show the detailed structure of the baffle plate with baffle plate. That is, the inflow port 10 of the first straightening vane 9 having a downward slope which fits into the opening 2a of the carburetor 2 is hooked 9a for cutting a part of the first straightening vane 9 downward as shown in FIG. And the hooked portion is used as the baffle plate 23 so that the flow of the mixed gas d is disturbed and further mixed.

[0014]

As described above, in the liquid fuel combustion apparatus of the present invention, the burner fixing metal fitting provided on the burner head is a single member formed by a two-stage drawing of one plate, so that the manufacturing and assembling steps are simplified. The first annular portion, which is the first stage, is brought into contact with the peripheral portion of the burner head, and the second annular portion, which is the second stage, is brought into contact with the peripheral portion of the carburetor opening. Combined with good heat conduction and absorption of radiant heat by the black heat-resistant paint applied to the inner wall of the vaporizer, heat back is maximized, which in turn reduces the power consumption of the electric heater to heat the vaporizer. Also leads to Also,
Since the uppermost second tubular part of the burner fixing metal fitting stands above the carburetor, outside air and secondary air are prevented from entering the root of the flame, and NOx generation is suppressed. ..

[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 burner fixing bracket.

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

FIG. 5 is a perspective view of a second straightening plate.

FIG. 6 is a perspective view of a first straightening vane.

[Explanation of symbols]

 2 Vaporizer 2a Opening 2c Opening peripheral part 8 Electric heater 12 Burner head 13 Burner fixing metal fitting 14 First annular part 15 First cylinder upper part 16 Second annular part 17 Second cylinder upper part 21 Black heat resistant paint a Liquid fuel b Primary air d Gas mixture

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[Procedure amendment]

[Submission date] November 26, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Detailed explanation of the invention

[Correction method] Change

[Correction content]

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 the drawback that it causes the generation of thermal NOx (nitrogen oxide) by adding extra air (mostly N2) 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 the 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 at the same time, a vaporizer having an opening at the top and an opening of the vaporizer are provided. A plate-shaped burner head that is attached and burns a mixed gas of vaporized fuel and combustion air that has been vaporized by a vaporizer, a first annular portion that is in contact with a peripheral portion of the burner head, and an outer peripheral edge of the first annular portion A first tubular portion that is erected upward from the first tubular portion, a second annular portion that extends outward from an upper end of the first tubular portion and that contacts the opening peripheral portion of the carburetor, and the second tubular portion.
And a metal member integrally having a second tubular portion that rises upward from the outer peripheral edge of the annular portion.

Also, liquid fuel and combustion air are supplied,
A liquid fuel vaporizes with an electric heater, and a vaporizer with an opening at the top, and a flat plate that is attached to the vaporizer's opening and burns a mixed gas of vaporized fuel vaporized by the vaporizer and combustion air. Of the burner head, a first annular portion in contact with the peripheral portion of the burner head, a first tubular portion raised upward from the outer peripheral edge of the first annular portion, the first annular portion
A second annular portion that extends outward from the upper end of the tubular portion and is in contact with the opening peripheral edge portion of the carburetor, and a second tubular portion that rises upward from the outer peripheral edge of the second annular portion are integrally provided. A metal member is provided, and black heat-resistant paint is applied to the inner wall of the vaporizer facing the first tubular portion.

[0007]

As described above, the burner head is pressed by the bottom portion of the burner fixing bracket, and the heat of the flame is radiated back to the vaporizer by the side surface of the first stage of the two-stage throttle. Start up at a position close to and prevent external air or secondary air from mixing into the root of the flame. Further, a black heat-resistant paint is applied to the inner surface of the vaporizer, which corresponds to the back surface of the side surface of the first stage, to improve absorption of radiant heat from the metal fitting.

[0008]

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 using a two-stage throttle burner fixing metal fitting, and 1 is a burner case in which a rectangular vaporizer 2 made of a material having good heat conduction is disposed. Below the burner case 1, there is an air inlet 3 at one end.
A sirocco-fan type blower 4 provided with the air blower 4 is arranged, a ventilation pipe 5 connected to the blower 4 is connected to an air nozzle 6 attached to one end of the carburetor 2, and an electromagnetic pump is provided at the center of the air nozzle 6. Fuel nozzle 7 connected to (not shown)
Is facing. The vaporizer 2 has a structure in which the upper portion has an opening 2a, the bottom surface 2b has an upward slope, and a convex portion 2c is disposed in the middle, and an electric heater 8 is embedded around the upper portion. Reference numeral 9 denotes a first straightening vane fitted with an opening 2a of the vaporizer 2 and having an inflow port 10 having a downward slope, and a punch metal-like second straightening vane 11 is arranged on the upper part of the first straightening vane 9. Further, the burner head 12 arranged so as to close the opening 2a at the carburetor opening peripheral portion 2d at the uppermost position is positioned. Reference numeral 13 denotes a first portion that contacts the peripheral portion 12a of the burner head 12 with screws around the periphery.
The annular portion 14, the first tubular portion 15 that is erected upward from the outer peripheral edge of the first annular portion 14, and the opening peripheral edge portion of the carburetor 2 that extends outward from the upper end of the first tubular portion 15. It is a metal burner fixing metal fitting of a two-stage drawing as a whole, which has a second annular portion 16 that comes into contact with 2d and a second tubular portion 17 that rises upward from the outer peripheral edge of the second annular portion 16. Reference numeral 18 is an ignition plug whose tip is directed to the surface of the burner head 12, and 19 is a secondary air supply port formed in the peripheral wall of the air nozzle 6, which is a ventilation inside the burner case 1 communicating with the secondary air supply port 19. Road 20
Of the vaporizer 2 faces the other end of the vaporizer 2. Reference numeral 21 is a black heat-resistant paint applied to the inner surface of the carburetor, which corresponds to the back surface of the side surface of the first stage of the burner fixing member 13, and serves as a liquid fuel combustion device 22 with the above-mentioned overall configuration.

The operation will be described. First, when the liquid fuel combustion device 22 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).

Here, the liquid fuel (petroleum) a is ejected from the fuel nozzle 7 into the carburetor 2, and the primary air b fed from the blower 4 flows in from the air nozzle 6 around the outer periphery of the fuel nozzle 7. The mixed gas d made up of the primary air b and the liquid fuel a comes into contact with the ascending bottom surface 2b of the vaporizer 2 and is vaporized. In this case, the passage of the mixed gas d is gradually narrowed by the upwardly sloping bottom surface 2b and the downwardly sloping first straightening plate 9, so that the mixed gas d having a high flow velocity collides with the convex portion 2c and is vaporized. The vaporized liquid fuel a is mixed with the supplied primary air b to disturb the flow by the baffle plate 23 of the inflow port 10 of the first straightening vane 9, and then a large number of small holes 24 provided in the second straightening vane 11 are provided. After being mixed well, it reaches the burner head 12 and is ignited by the spark plug 18 at the burner head 12 to start combustion. In this way, the mixing of the combustion air and the vaporized fuel becomes good, so that local red fire and CO are rarely generated.

On the other hand, the burner fixing metal fitting 13 holds down the burner head 12 by the bottom portion (first annular portion 14) and radiates the heat of the flame rising at the first side surface (first cylindrical portion 15) of the two-stage throttle. To heat-back (heat recovery) to the opening peripheral edge 2d of the vaporizer 2 to improve heat conduction to the vaporizer opening peripheral edge 2c at the second annular portion 16, and further to the second stage at a position close to the flame. The start-up (the second tubular portion 17) and the mixing of the external air or the secondary air c into the root of the flame are prevented. Also,
Since the black heat-resistant paint 21 is applied to the inner surface 2e of the vaporizer that hits the back surface of the side surface of the first stage, the radiant heat from the burner fixing fitting 13 is absorbed well. Therefore, the burner fixing bracket 1
Heat conduction from 3 promotes heat back to the vaporizer 2.

5 and 6 show the detailed structure of the baffle plate with baffle plate. That is, the inflow port 10 of the first straightening vane 9 having a downward slope which fits into the opening 2a of the carburetor 2 is hooked 9a for cutting a part of the first straightening vane 9 downward as shown in FIG. And the hooked portion is used as the baffle plate 23 so that the flow of the mixed gas d is disturbed and further mixed.

[0014]

As described above, in the liquid fuel combustion apparatus of the present invention, the burner fixing metal fitting provided on the burner head is a single member formed by two-stage drawing of one plate, so that the manufacturing and assembling steps are simplified. The first annular portion, which is the first stage, is brought into contact with the peripheral portion of the burner head, and the second annular portion, which is the second stage, is brought into contact with the peripheral portion of the carburetor opening. Combined with good heat conduction and absorption of radiant heat by the black heat-resistant paint applied to the inner wall of the vaporizer, heat back is maximized, which in turn reduces the power consumption of the electric heater to heat the vaporizer. Also leads to Also,
Since the uppermost second tubular part of the burner fixing metal fitting stands above the carburetor, outside air and secondary air are prevented from entering the root of the flame, which has the effect of suppressing the generation of NOx. ..

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[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 burner fixing bracket.

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

FIG. 5 is a perspective view of a second straightening plate.

FIG. 6 is a perspective view of a first straightening vane.

[Explanation of Codes] 2 Vaporizer 2a Opening 2c Opening peripheral part 8 Electric heater 12 Burner head 13 Burner fixing metal fitting 14 First annular part 15 First cylinder upper part 16 Second annular part 17 Second cylinder upper part 21 Black heat resistant paint 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 in the upper part, and attached to the opening of the vaporizer,
A flat plate burner head for burning a mixed gas of vaporized fuel and combustion air vaporized by a vaporizer, a first annular portion in contact with a peripheral portion of the burner head, and an upper portion from an outer peripheral edge of the first annular portion The raised first tubular portion, the second annular portion that extends outward from the upper end of the first tubular portion and contacts the opening peripheral edge portion of the carburetor, and the outer peripheral edge of the second annular portion upward. A liquid fuel combustion apparatus, comprising: a metal member integrally having a raised second tubular portion. 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 part, and attached to the opening of the vaporizer,
A flat plate burner head for burning a mixed gas of vaporized fuel and combustion air vaporized by a vaporizer, a first annular portion in contact with a peripheral portion of the burner head, and an upper portion from an outer peripheral edge of the first annular portion The raised first tubular portion, the second annular portion that extends outward from the upper end of the first tubular portion and contacts the opening peripheral edge portion of the carburetor, and the outer peripheral edge of the second annular portion upward. A liquid fuel combustion apparatus, comprising: a metal member integrally having a raised second tubular portion, and black heat-resistant paint is applied to an inner wall of the vaporizer facing the first tubular portion. ..