JPH0460307A - Liquid fuel burner - Google Patents

Abstract

PURPOSE:To make it possible to heat the air by the high temperature exhaust gas that is formed at the combustion section after combustion is started and reduce electric power consumption due to the use of an electric heater by providing an exhaust gas circulation means which mixes part of the high temperature exhaust gas produced in the combustion section with the air that is taken in and circulates the mixture. CONSTITUTION:When the operation is started and the combustion is started, the high temperature exhaust gas that is formed in a combustion section 50 is mixed with air in an exhaust gas circulation means (consisting of an exhaust gas channel 71 and a control valve 72) and the mixture gas is circulated, and the air that is sent to an evaporation chamber 20 is suitably heated by the high temperature exhaust gas. With this arrangement in the steady combustion except the initial stage of ignition right after starting the operation it can be continued without using an electric heating means 30 or with a small consumption of electric power. And, since the heating of the air by mixing the high temperature exhaust gas is direct, it is possible to heat the air by following without delay a rapid increase of fuel.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a method for supplying atomized liquid fuel such as petroleum into heated air, evaporating the liquid fuel at a relatively low temperature,
The present invention relates to a liquid fuel combustion device that performs combustion.

<Prior Art> A conventional example of this type of device will be described with reference to FIGS. 5 and 6. Figure 5 is a cross-sectional diagram of the conventional device, and Figure 6 is C of Figure 5.
-C sectional view.

Air is taken in by a fan 11 and sent into the evaporation chamber 20 through a supply path 12. 30 is an electric heater for heating the air midway. On the other hand, liquid fuel such as petroleum is atomized into the evaporation chamber 2 through the injection nozzle 40.
It is ejected within 0. In the evaporation chamber 20, the introduced atomized fuel is directly catalytically evaporated by the heated air also introduced. Then, the vaporized fuel is transferred to the combustion section 50.
and is sent to be burned. The temperature of the air heated by the electric heater 30 is controlled by a temperature sensor 60.

<Problems to be Solved by the Invention> However, in the conventional apparatus described above, since air is heated by an electric heater, electric power is constantly consumed during operation, which is disadvantageous in that it is not economical. In addition, as the amount of fuel supplied increased, the power consumption of the electric heater increased, and for general household use, there was a drawback that the capacity of the electric wiring was insufficient.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a liquid fuel combustion device that eliminates the drawbacks of the conventional devices described above, eliminates the need to worry about power consumption even when the amount of fuel supplied is large, and consumes less power in steady state. .

<Means for Solving the Problems> In order to achieve the above object, the liquid fuel combustion device of the present invention directly catalytically evaporates the atomized liquid fuel introduced into the room with heated air also introduced into the room. an evaporation chamber; an air feeding means for taking in air from the outside and sending it into the evaporation chamber; an electric heating means provided to heat the air taken in from the outside midway; A liquid fuel combustion device comprising a fuel introduction means for injecting fuel into the evaporation chamber, and a combustion section for burning the fuel vaporized in the evaporation chamber, wherein a part of high-temperature exhaust gas generated in the combustion section is mixed with the air taken in. The first feature is that an exhaust gas circulation means is provided to circulate the exhaust gas.

Furthermore, in the liquid fuel combustion apparatus of the present invention, in the first feature, instead of providing the exhaust gas circulation means, an exhaust heat circulation means is provided for heating the air sent in using high temperature waste heat generated in the combustion section. is the second feature.

<Operation> According to the first feature, when the operation is started and combustion is started, the high-temperature exhaust gas generated in the combustion section can be mixed with air and circulated by the exhaust gas circulation means, so that the evaporation chamber The air sent to the system is appropriately heated by the high-temperature exhaust gas. Therefore, during steady combustion excluding the initial stage of ignition after the start of operation, operation can be continued without using electrical heating means or with less power consumption. Furthermore, since heating of the air by mixing high-temperature exhaust gas is more direct than when using an electric heater or the like, it is possible to quickly follow a sudden increase in fuel and heat the air.

According to the second feature, exhaust heat is circulated instead of the exhaust gas in the first feature, so the same effect as in the first feature is achieved. Moreover, in that case,
Since the exhaust gas is not recycled, the air sent to the evaporation chamber is clean.

<Embodiment> FIG. 1 is a cross-sectional configuration diagram showing a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1. The same members and elements as in the conventional example shown in FIGS. 5 and 6 are given the same reference numerals.

The evaporation chamber 20 consists of a cylindrical outer tube 21 and disk-shaped opposite end walls 22, and an injection nozzle 40 for injecting liquid into the evaporation chamber 20 is provided on the central axis of the outer tube 21. This injection nozzle 40 constitutes fuel introduction means.

The fan 11 is provided with a suction chamber 13.

The fan 11, the suction chamber 13, and the supply path 12 constitute means for feeding air into the evaporation chamber 20. The suction chamber 13 is provided with an inlet 13a for external air and an inlet 13b for exhaust gas from the combustion section 5. 13c is a jammer plate.

From the combustion section 50, an exhaust gas passage 71 connects to the suction chamber 13.
It has been extended to. As a result, a portion of the high-temperature exhaust gas generated in the combustion section 50 is circulated to the suction chamber 13 through the exhaust gas passage 71. A control valve 72 is provided in the middle of the exhaust gas passage 71 to control the amount of circulating exhaust gas. The exhaust gas passage 71 and the control valve 72 constitute exhaust gas circulation means.

When the operation is started, the fan 11 rotates and air is sucked in. The air heated by the electric heater 6, which is an electric heating means, is introduced into the evaporation chamber 20 through the supply path 12. When the inside of the evaporation chamber 20 is filled with heated air, the liquid fuel enters the evaporation chamber 2 through the injection nozzle 40.
Introduction is started in an atomized state within 0%. The liquid fuel mixed with the heated air and evaporated into a combustion chamber 50.
is sent to and burned. After the flame has stabilized, the control valve 7
2 is opened, and part of the combustion exhaust gas is sent into the suction chamber 13 of the fan 11 through the exhaust gas passage 71. Thereafter, the high-temperature exhaust gas and fresh room-temperature air are mixed, brought to an appropriate temperature, and introduced into the evaporation chamber 20. After the control valve 72 is opened, the electric heater 30 is de-energized or weakened. At the same time, the air is heated mainly by a temperature sensor 6 installed in the supply path 12 immediately before the evaporation chamber 20.
The control valve 72, which operates under the control of 0, adjusts the temperature to an appropriate temperature while changing the mixing ratio of the exhaust gas and room temperature air.

Note that the control valve 72 can be opened and closed based on a flame detector provided in the combustion section 50.

FIG. 3 is a cross-sectional configuration diagram showing a second embodiment of the present invention, and FIG.
The figure is a sectional view taken along the line BB in FIG. 3.

In this embodiment, a heat exchanger 83 is provided in the combustion section 50, and the air that has been heat exchanged and heated by the heat exchanger 83 is guided to the suction chamber 13 of the fan 11 through a passage 81. 82 is a control valve that controls the amount of heat exchange air passing through the passage 81. Further, 13b is an inlet for heat exchange air from the combustion section 50 provided in the suction chamber 13. The heat exchanger 83, the passage 81 and the control valve 82 are substantially connected to the combustion section 5.
The exhaust heat circulation means is constituted by circulating the exhaust heat generated at zero. Other members and elements having the same functions and actions as those already explained in the conventional example and the first embodiment are denoted by the same reference numerals and shown in FIGS. 3 and 4.

After the operation is started, the process until the flame in the combustion section 50 becomes stable is the same as in the first embodiment. When the flame becomes stable, the control valve 82 is opened, and air heated by the heat exchanger 83 (approximately 400° C. to 1000° C.) is sent into the suction chamber 13 through the passage 81. The air is then mixed with air at room temperature, brought to an appropriate temperature, and introduced into the evaporation chamber 20. After the control valve 82 is opened, the electric heater 30 is de-energized or weakened. The temperature of the air introduced into the evaporation chamber 20 is controlled by a temperature sensor 60 and a control valve 82.
This is done by adjusting the amount of hot air fed through 1. The control valve 82 is opened and closed based on a flame detector (not shown) provided in the combustion section 50.

<Effects> The present invention has the above configuration, and according to the liquid fuel combustion device according to claim 1, after combustion is started, the air can be heated by the high temperature exhaust gas generated in the combustion section. , it is possible to reduce power consumption due to the use of electric heaters. Moreover, it can be used in a general household without worrying about the capacity of electric wiring due to the use of an electric heater. Furthermore, since the air is directly heated with high-temperature exhaust gas,
Even when a large amount of heated air is supplied due to a sudden increase in fuel supply, it can be quickly followed.

Further, according to the liquid fuel combustion apparatus according to the second aspect, the exhaust heat of combustion is circulated, so that it is possible to obtain the same effect as the above-mentioned effect obtained by the configuration according to the first aspect. Moreover, since no exhaust gas is mixed into the evaporation chamber or the combustion section, and only fresh air is supplied, combustion efficiency is also improved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional configuration diagram showing the first embodiment of the present invention, and FIG.
The figures are a cross-sectional view taken along the line AA in FIG. 1, FIG. 3 is a cross-sectional view showing the second embodiment of the present invention, FIG. 4 is a cross-sectional view taken along the line B-B in FIG. 3, and FIG. 5 is a conventional device. 11: Fan 12: Supply path 20: Evaporation chamber 30: Electric heater 40: Injection nozzle 50: Combustion section 60: Temperature sensor 71: Exhaust gas passage 72: Control valve 81 : Passage 82 : Control valve 83 : Heat exchanger C sectional view.

Claims (2)

[Claims] (1) an evaporation chamber that directly evaporates the atomized liquid fuel introduced into the room with heated air also introduced into the room; an air feeding means that takes in air from the outside and sends it into the evaporation chamber; an electric heating means provided to heat the air taken in from the evaporation chamber midway, and a fuel introduction means for injecting liquid fuel in an atomized state into the evaporation chamber;
A liquid fuel combustion device comprising a combustion section that burns the fuel vaporized in the evaporation chamber, and an exhaust gas circulation means that mixes a part of the high-temperature exhaust gas generated in the combustion section with the air taken in and circulates the mixture. A liquid fuel combustion device characterized by: (2) Liquid fuel combustion according to claim 1, characterized in that instead of providing the exhaust gas circulation means, an exhaust heat circulation means is provided that heats the air sent in using high temperature waste heat generated in the combustion section. Device.