JPS6057105A - Liquid fuel combustion burner - Google Patents

Abstract

PURPOSE:To reduce an initial rise time and to decrease power energy consumed during evaporation, by a method wherein a heater is embedded in a heat resisting ceramic to cause it to function as a liquid fuel evaporating surface, and the fuel is supplied directly to the surface. CONSTITUTION:A resistor 7 is printed on the back of a heat resisting alumina sheet 6, and an insulating protection layer 8 is coated thereon. Energization is applied on an integrally sintered flat type heat-generating body 9, and after the surface thereof is heated up to a proper temperature at which liquid fuel is evaporated, the liquid fuel is fed to the flat type heat generating body 9 through a liquid fuel feed-in pipe 10 with the aid of an electromagnetic pump. The air for combustion is fed through a combustion air feed-in pipe 11, the air for combustion is well mixed with liquid fuel gas evaporated at the surface of the flat type heat generating body 9, the mixture flows through pores 12, and is supplied to a burner port plate to be burnt on the surface thereof.

Description

Detailed Description of the Invention Field of Application The present invention relates to a vaporization section of a liquid fuel combustion device that vaporizes liquid fuel on a hot plate and supplies the liquid fuel gas together with combustion air to a combustion section for combustion. This is related to the configuration of the .

Structure of conventional example and its problems Conventionally, this type of liquid fuel combustion apparatus has a heating plate 1.2 for vaporizing liquid fuel, a sheathed heater 3 for heating the heating plate, and a flat ceramic plate as shown in FIGS. 1 and 2. The heater 4 is separate from the heater 4, and the hot plate 1.2 and each heater 3.4 are brought into close contact with each other to heat the hot plate by thermal conduction. As shown in Figures 1 and 2, the characteristics of this type of device are that it can be made into any shape that makes it easy to supply fuel to the vaporization surface, but on the other hand, it indirectly heats the hot plate 1.2. Therefore, the initial chamber −
The heating time (the time from when the start switch is turned on until ignition is possible) is long, and depending on the shape or material of the hot plate 1.2, a large amount of energy is consumed.

Although the amount varies depending on the shape of the surface of the hot plate used for 3-page separation or the temperature at the time of vaporization, a certain degree of tar precipitation on the surface of conventional vaporizers has been a problem that cannot be prevented.

OBJECT OF THE INVENTION The present invention solves the problems of the prior art, and
The purpose is to shorten the 1-time period and reduce the electric energy required during vaporization. The purpose is to simplify the configuration of the vaporizing section and make it smaller.

Structure of the Invention In order to achieve this object, the present invention utilizes the material itself of a ceramic heater in which a heater is embedded inside a heat-resistant ceramic as a liquid fuel vaporization surface, so that the liquid fuel can be directly supplied onto the surface. The structure is equipped with a supply pipe and a combustion air inlet pipe for introducing the air that has the role of transporting the evaporated fuel to the combustor. It is possible to obtain a short initial start-up time, which was previously impossible, and also has an excellent energy saving effect.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

In Fig. 3, a resistor 7 is printed on the back side of a heat-resistant alumina sheet 6, which has a disk-shaped surface 4 with a low embankment-like barrier 5 around it, and an insulating protective layer 8 is coated on the surface, and then integrally baked. The resulting material is used as a flat heating element 9. The outlet of the liquid fuel supply pipe 10 is close to the second part of the flat heating element 9 so that liquid fuel is supplied to the surface of the flat heating element 9. Four combustion air inlet pipes 11 are connected to the lower part with a slight gap.

A part of the rounded flat heating element 9 has a small hole 12 for improving the mixing of fuel and combustion air, and a burner plate 14 with a plurality of burner holes 13 is provided in the lower part thereof. is set up.

In the configuration described in -1-, the flat heating element 9 is energized, and after its surface reaches a temperature suitable for evaporating the liquid fuel (approximately 250 to 300°C when kerosene is used), the liquid Fuel is supplied to the flat heating element 9 through a liquid fuel inlet pipe 10 by an electromagnetic pump (not shown). At the same time, combustion air is supplied through the combustion air inlet pipe 11, mixes well with the liquid fuel gas vaporized on the surface of the flat heating element 9, passes through the small holes 12, and enters the flame plate. is supplied and burns on its surface.

Incidentally, tar deposited on the surface of the flat heating element 9 can be easily cleaned by temporarily increasing the temperature (700-800'C) at the end of combustion, or by lowering the temperature by 2 degrees at an appropriate time.

According to this configuration, when using kerosene as fuel, the standby time can be reduced to within 20 seas, and the required power is less than 50 W (when kerosene 3,000 m2/n is vaporized), compared to conventional methods. Compared to the 200 to 500W of 2000 to 500W, it can be expected to save a lot of energy. Furthermore, as mentioned earlier, tar precipitation can be prevented, and the structure can be made more compact.

Next, another embodiment is shown in FIG. In addition, Figure 3 and page 6 Identical parts are given the same numbers.

In FIG. 4, a resistor 7 is printed on the surface of a cylindrical heat-resistant alumina tube 15, an insulating protective layer 8 is coated on the surface, and the tubular heating element 16 is sintered. A liquid fuel supply pipe 10 is inserted halfway into the tubular heating element 16 so as to supply fuel to the interior of the tubular heating element 16, particularly to the portion where the heater 7 is present. The heated part of the tubular heating element 15 (the first half with a built-in heater) projects into the mixing chamber 16, and the unheated part is inside the combustion air inlet pipe 11 connected to the side of the mixing chamber 17. It is set in. Mixing room 17
The second part has small holes 12 to improve the mixing of the fuel and combustion air, as shown in Fig. 3, and the -1 part is equipped with a burner plate 14 with a plurality of burner ports 13. has been done.

In the above configuration, after the tubular heating element 16 is energized and its internal surface reaches a temperature suitable for vaporizing the liquid fuel,
Liquid fuel is supplied to the internal vaporizing surface of the tubular heating element 16 through the liquid fuel inlet pipe 10 by an electromagnetic pump (not shown). At the same time, seven vanes are used to supply combustion air from the combustion air inlet pipe 11, a portion of which enters the tubular heating element 16, pushes out the vaporized liquid fuel, and enters the mixing chamber 17. On the other hand, air passing outside the tubular heating element 16 enters the trench/mixing chamber 17, where it is mixed with vaporized liquid fuel. The subsequent operations are the same as those of the embodiment shown in FIG. 3, and will therefore be omitted.

According to this configuration, when liquid fuel is supplied to the tubular heating element 16, it is discharged from the outlet as a gas, so it is practically the same as the configuration of a gas combustor and is mechanically simple. , it can also be made smaller in shape. Further, the same effects as described in the embodiment shown in FIG. 3 can be expected.

Effects of the Invention According to the liquid fuel combustion apparatus of the present invention, the following effects can be obtained.

(1) A short standing time can be obtained, which was previously not possible with this type of hot plate vaporization type combustor.

(2) The power required to heat the vaporizing surface can be reduced.

JP-A-Sho GO-57105 (3) (3) Kerosene residue or tar deposits do not accumulate on the vaporizing surface, reducing troubles caused by tar deposits.

(4) Compared to the vaporization part of a conventional hot plate vaporization burner,
The vaporizing section of the combustor can be made significantly smaller.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of a liquid fuel combustion device that uses a conventional hot plate vaporization method; Figure 3 is a cross-sectional view of an embodiment of a liquid fuel combustion device that uses a zero-start method; The figure is a sectional view showing another embodiment of the same device. 9...Flat heating element, 10...Liquid fuel feed pipe, 11...Combustion air feed pipe, 16...
...Tubular heating element. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure I 4

Claims (4)

[Claims] (1) A mixing chamber that vaporizes liquid fuel and mixes it with air;
A heating element provided in the mixing chamber and having a heater embedded inside heat-resistant ceramics, a liquid fuel supply pipe that supplies liquid fuel directly to the surface of the heating element, and mixing with the liquid fuel evaporated on the surface of the heating element. and a combustion air inlet pipe for introducing air to the liquid fuel combustion apparatus. (2) The liquid fuel combustion device according to claim 1, wherein the heating element made of heat-resistant ceramic has a cylindrical shape or a flat plate shape. (3) Surface heat 11!4E-1 = Lamix is alumina,
The liquid fuel combustion device according to claim 1, which is made of mullite, cochillerite, and zirconia. (4) The liquid fuel combustion apparatus according to claim 1, wherein the temperature of the heating element is temporarily maintained at a higher temperature than during steady combustion immediately after supplying the fuel. 2be1;゛