KR100606199B1 - Liquid fuel burner use ultrasonic nozzle - Google Patents

Abstract

The present invention relates to a liquid fuel combustion device using an ultrasonic nozzle having a spray surface at the tip used for a petroleum heater, a petroleum water heater, a burner of a fuel cell reformer using liquid fuel such as kerosene, diesel fuel, etc. Low emission from the lower surface, low emission of nitrogen oxide, operation noise is about the same level as the evaporative burner, and the ultrasonic nozzle with the tip spraying surface is applied to the diffusion type burner of the port type so that it is resistant to the altered kerosene and the output of the burner can be easily controlled. In combination, the spray surface of the ultrasonic nozzle is located at the fuel spraying inlet of the inner bottom of the diffusion combustion communication communicating with the combustion air blowing path of the burner so as to approximate the improvement of the Gamport burner. Combustion air supply opening between the inner bottom of the barrel and the combustion air control plate By controlling the supply of the combustion air lowers the excess up to realize the low noise burner by the rectification effect of lowering the air flow passage of the combustion air flow rate by the low excess air combustion in accordance with the effective use of fine spray particles of the burner fuel.

Description

Liquid fuel burner using ultrasonic nozzle with spray surface at the tip {Liquid fuel burner use ultrasonic nozzle}

1 is a longitudinal sectional view showing a form of an embodiment of the present invention;

Figure 2 is an embodiment showing a control circuit blog diagram of the present invention

Figure 3 is an embodiment showing a sequence of the burner controller at the ignition of the present invention

Figure 4 is an embodiment showing a sequence of the burner controller when extinguishing the present invention

5 is an exemplary view showing a sequence of a burner controller at restart of the present invention;

6 is an exemplary view showing an oil supply route of the present invention.

Figure 7 is an embodiment showing a combustion air control plate of the ventilation path of the present invention

Figure 8 is an embodiment showing a state in which the ignition electrode is installed on the ultrasonic nozzle bracket

9 is an enlarged cross-sectional view showing a port type diffusion burner of the present invention.

Explanation of symbols for important parts of the drawings

1: Ultrasonic nozzle with tip spraying surface 1a: Ultrasonic nozzle tip spraying surface
2: ignition electrode 3: fuel spray supply port

4: combustion air blowing path 5: vaporization cylinder 5a: vaporization gas outlet

6: diffusion combustion communication 6a: diffusion combustion air supply port

7: Blowing motor 8: Combustion air supply fan 9: Flame detection frame rod

10: combustion air control plate 10a: combustion air supply control hole

10b: Combustion air supply port 11: Nozzle holder assembly B: Burner

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion apparatus using an ultrasonic nozzle having a spray surface at a tip used for a petroleum heater, a petroleum water heater, a burner of a reformer for a fuel cell, and the like, which use liquid fuel such as kerosene and diesel.

In kerosene-based oil heaters and oil heaters, gun-type burners and evaporative burners are used. Apparatus for granulating kerosene, etc. by ultrasonic vibrator has been applied so far, but it is rarely present in the market because of problems such as vaporization, premixed burner and reliquefaction of fuel spray.

The previous gun type burner can be compact and high-loaded, and has good controllability. However, if the operation noise is large or the output of the burner is largely variable (for example, about 5: 1), a relatively expensive device is required. There is a flaw.

On the other hand, the vaporization burners which are put into practical use are almost all of the open vaporization types, and many of them are rotary burners.

This is premixed combustion and has to vaporize the liquid fuel in advance and is concerned about the formation of tar at that time, especially when using modified kerosene.

In addition, it is difficult for small and high loads, and the combustion reaction zone is heated to a high temperature.

On the other hand, however, the operation noise is low and the burner output control is relatively easy.
In addition, a liquid fuel device having a structure comparable to the vaporization cylinder and the diffusion-combustion structure in the present invention is disclosed in Japanese Patent Application Laid-Open No. 09-250712, and has a structure comparable to the blowing path structure in the present invention. Although the combustion apparatus has been published in Korean Utility Model Publication No. 1990-17336, these are all of the evaporation type, for example, the combination of the burner, it is impossible to use the ultrasonic nozzle having a spray surface at the tip applied here.

The present invention is to solve the drawbacks of the prior art, and in terms of small size and high load than the gun type burner, the emission of nitrogen oxide is low, the operating noise is about the same level as the evaporative burner, and also has the resistance to altered kerosene and at the same time output of the burner The pressure spray nozzle was combined with a pot type diffusion combustion burner for easy control, and the ultrasonic spray nozzle of Patent No. 329990 (Fuel injection device for heating equipment) was applied as a replacement for the so-called gas spray burner.
The ultrasonic nozzle of Patent No. 329990 applied to the present invention effectively transmits the vibration generated from the vibrating means to the ultrasonic nozzle end surface to atomize the liquid fuel supplied from the oil tank to the maximum so that the ultrasonic nozzle can be applied to the present invention. As a result of testing in various ways, the spray surface of the ultrasonic nozzle tip is placed in the fuel spray supply port communicating with the combustion air blowing path of the burner to atomize the combustion fuel of fine particles injected from the spraying surface of the ultrasonic nozzle by diffusion combustion. The blower path that is injected and communicates with the diffusion combustion communication is controlled by the combustion air supply port between the inner bottom of the gasification chamber and the combustion air control plate and the combustion air supply control hole drilled in the combustion air control plate to reduce the excessive supply of combustion air. Increasing combustion rate compared to evaporation rate To reduce the size of the burner, lower the operation noise of the burner as commutation of the combustion gas than the combustion air, and lower the temperature of the combustion gas to produce so-called thermal nox (oxidation of nitrogen in combustion air). The effect of suppressing was achieved.

The following describes the means for resolving each burner defect.

For small and high loads, the spray particles of the ultrasonic nozzle with the spray surface at the tip are effectively used to increase the combustion rate compared to the fuel evaporation rate and to blue flame diffuser burner. Improved to one.

In terms of operating noise, the port-type diffusion combustion burner characteristics were inherited, and gas rectification was corrected rather than combustion air to reduce combustion noise.

In order to reduce nitrogen oxide emissions, a gas cylinder is placed inside a pot-type diffusion combustion burner, and during normal combustion, the exhaust gas that is ejected from the gas cylinder is burned by the diffusion combustion air supplied from the front side of the gas cylinder of the burner. Therefore, the temperature of the combustion gas is lowered by increasing the temperature of the combustion gas, that is, endotherming the gasification cylinder during the combustion reaction, thereby suppressing the generation of so-called summer knox.

In general, a premixed burner results in backfire, but the burner is basically a diffusion burner and no backfire occurs in the premixed burner.

As for the resistance to altered kerosene, as mentioned above, the gas cylinder is heated to high temperature, so the fuel spray sprayed from the ultrasonic nozzle is contacted at a high temperature (above 400 ° C) and evaporates instantly in the shortest time, so there is no time for polymerization. There is no generation of tar. Of course, the spray particle diameter density of the ultrasonic nozzle has a great effect.

For the output control of the burner, the original characteristics of the port type burner were used, and at the same time, the flow control type electronic pump was used as the fuel supply means to the ultrasonic nozzle.

Best Mode for Carrying Out the Invention Embodiments related to the present invention will be described below with reference to the drawings.

Fig. 1 shows a longitudinal cross-sectional structure of the embodiment, in which the ultrasonic nozzle 1 is connected to the fuel spray supply port 3 of the inner surface 6b of the diffusion combustion communication communicating with the combustion air blowing path 4 of the burner B. The spray surface 1a is installed to be located, but the vaporization cylinder 5 with the tip 5b closed at the inner center of the diffusion combustion cylinder 6 is discharged to the vaporization gas outlet 5a connected to the vaporization cylinder 5. The vaporized gas to be burned with the fresh air with the combustion air diffused into the diffusion combustion air supply port (6a) of the diffusion combustion communication (6) to inherit the port type diffusion combustion burner characteristics.

In addition, the ultrasonic nozzle (1) is fixed to the non-conductive nozzle holder assembly (11) to prevent the change of ultrasonic characteristics, and the combustion air control plate (10a) in which the combustion air control holes (10a) are drilled in the combustion air flow path (4). (10) was installed to improve clean flame combustion efficiency by controlling air volume and wind speed of combustion air.

The ultrasonic nozzle 1 is connected to the oil pump 13, the oil pump 13, and the electronic pump 12 is connected to the side flowing in front of the ultrasonic pump 1 is controlled by the burner controller 14 to the extent that a predetermined burner output is obtained. An ignition electrode 2 is provided in close proximity to the spray surface 1a of the ultrasonic nozzle 1 and serves to discharge and ignite the liquid fuel spray in the ultrasonic nozzle 1, and its input wiring is connected to the ignition transformer 15. Control by the burner controller 14 is performed.

Combustion air supplied to the combustion air blowing path 4 is supplied by the fan 8 of the blowing motor 7 controlled by the burner controller 14, and the diffusion combustion air supply port of the diffusion combustion communication 6 ( The flame detection frame rod 9 is installed at the tip of the part 6a) to form a flame detector together with the burner controller 14, and to maintain safety by detecting an abnormality such as incombustibility.

Next, the operation of the burner will be described.

At the time of ignition (starting), the blower motor 7 starts first in the order shown in FIG. 3, the fan 8 rotates, and a predetermined pulse voltage is applied to the ultrasonic nozzle 1 simultaneously with the blower motor 7. .

Since the ultrasonic nozzle 1 needs some preparation time after the start of energization, the ultrasonic nozzle 1 is energized to the ignition transformer 15 in accordance with the signal of preparation completion from the driving circuit, and the discharge of the ignition electrodes 2 is started. A driving voltage is applied to the burner controller 14 at 12) and the ultrasonic nozzle 1 starts spraying fuel. Then is lit. The discharge of the ignition electrode 2 is continued for a predetermined time after the ignition. At that time, an ignition flame is formed inside the vaporization cylinder 5 to preheat the vaporization cylinder 5.

When the discharge of the ignition electrode 2 is stopped after the predetermined time, the ignition flame inside the vaporization cylinder 5 is extinguished, and the vaporization gas is ejected from the vaporization gas outlet 5a of the vaporization cylinder 5 to burn the diffusion of the burner. Diffusion combustion is carried out in accordance with the air flowing from the air supply port 6a. At this time, it is thought to be extinguished by the shoe, but this is prevented by adjusting the air pressure between the inside of the vaporization cylinder 5 and the outside of the diffusion combustion cylinder 6 with the combustion air regulating device 10a.

At the time of extinguishing, the electronic pump is first stopped in the order shown in FIG. 4 to stop the supply of fuel and to stop the ultrasonic nozzle 1.

This is because the operation is prevented by the generation of unburned gas following the fuel in the ultrasonic nozzle 1. The blower motor 7 stops when the temperature of the burner portion is lowered to some extent and the heat radiation does not adversely affect the ultrasonic nozzle 1 or the like.

At the time of recombustion, the blower motor 7 is started in the order shown in FIG. 5 and a pulse voltage is applied to the ultrasonic nozzle 1 so as to energize the ignition transformer 15 and to ignite by the driving of the electronic pump 12. Ignition time is shorter than

As described above, the effect of the present invention is that low excess air combustion (combustion with less air rate than the combustible excess air rate) depends on the effective utilization of the fine spray particles due to the spray surface of the ultrasonic nozzle tip having the spray surface at the tip. ). In addition, a synergistic effect with the endothermic action of the gas cylinder can provide a low nitrogen oxide burner (Nox controlled burner).

Low noise burners have been realized due to the reduction of combustion air flow rate due to low excess air combustion and the rectifying effect of the blowing path.

Claims (2)

A liquid fuel combustion device that granulates liquid fuel and sprays it into the burner by using an ultrasonic nozzle having a spraying surface at the tip.The spraying surface is sprayed at the tip of the fuel spray supply port 3 of the burner in communication with the blower passage 4 of the burner. The blowing surface 4a communicating with the diffusion combustion cylinder 6 while the spray surface 1a at the tip of the ultrasonic nozzle 1 having the upper surface is installed is burned with the inner bottom 6b of the vaporization cylinder 5 and burned. Combustion air supply port (10b) between the air control plate (10) and the combustion air supply control hole (10a) drilled in the combustion air control plate 10 to control the low excess air in accordance with the effective utilization of the fine spray particles of liquid fuel A liquid fuel combustion apparatus using an ultrasonic nozzle with a spray surface at the tip, which realizes a low noise burner by lowering combustion air flow rate and rectifying effect of a blowing path. delete

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