JPH06137518A - Liquid fuel burner - Google Patents

Abstract

PURPOSE:To perform clean burning by atomizing and supplying liquid fuel, evaporating and vaporizing it to burn it. CONSTITUTION:High concentration vaporized mixture fuel obtained by an evaporating chamber 42 mostly becomes dilute vaporized mixture fuel of a suitable temperature with temperature and concentration regulating air, and is partly fed to a burning unit 47 while it remains high concentration and vaporized mixture fuel. Since burning in the unit 47 is conducted mostly in dilute mixture fuel having not high temperature, a temperature of a flame is low, and discharge quantities of CO, NOx are suppressed. Since the mixture fuel fed to the unit 47 together with the dilute mixture fuel has sufficiently stable burning range for blowing of flame and back fire, the mixture fuel is burned together and hence stable burning range for the blowing of the entire flame and back fire is increased. Thus, clean burning can be conducted.

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 in which a liquid fuel such as kerosene is atomized and supplied, and is vaporized to be used for combustion.

[0002]

2. Description of the Related Art An example of a conventional liquid fuel combustion apparatus of this type will be described with reference to FIGS. FIG. 7 is a vertical sectional front view of the conventional apparatus, and FIG. 8 is a vertical sectional side view of the conventional apparatus. An evaporation chamber 2 is formed in the cylindrical evaporation container 1, and a jet nozzle 3 of the liquid fuel is exposed to the internal evaporation chamber 2 on the central axis of the cylindrical evaporation container 1. The liquid fuel is sent to the ejection nozzle 3 and introduced into the evaporation chamber 2 in the atomized state. Evaporation container 1
Is provided with one hot air inlet 7 in the tangential direction on the cylindrical wall surface near the end face facing the jet outlet of the jet nozzle 3, and the hot air introduced from the inlet 7 evaporates the hot air. The liquid fuel sprayed into the chamber 2 is directly vaporized at a relatively low temperature. The vaporized mixed fuel thus obtained is discharged from the delivery port 8 also provided in the tangential direction on the cylindrical wall surface to the combustion section 9
Sent to and used for combustion.

[0003]

However, in the above-mentioned conventional apparatus, since the liquid fuel is vaporized within the limited space inside the cylindrical evaporation container 1 and within the limited time, When evaporating a large amount of fuel to obtain a high-concentration vaporized mixed fuel, it is necessary to raise the temperature of the high temperature air introduced from the high temperature air inlet 7 to a higher temperature. There was a problem that the temperature of the vaporized mixed fuel that had been vaporized may exceed 300 ° C. This rise in vaporized mixed fuel temperature causes rise in flame temperature and increases CO and NO _X concentrations. Therefore,
In the patent application filed on the same day as the present application, the applicant mixes the temperature-adjusting air with the high-concentration vaporized-mixed fuel obtained in the vaporization chamber to adjust the temperature of the vaporized-mixed fuel to an appropriate temperature ( A device was provided which was adjusted to 100 ℃ to 250 ℃) to reduce the generation of CO and NO _X , and as a lean vaporized mixed fuel, which also reduced the generation of NO _X.
However, when the vaporized mixed fuel used for combustion is lean, the stable combustion range is narrow and there is a drawback that flame blow-off or flashback is likely to occur.

Therefore, an object of the present invention is to provide a liquid fuel combustion apparatus which solves the above-mentioned drawbacks of the prior art and can perform clean combustion with a low concentration of CO and NO _X and has a wide stable combustion range.

[0005]

In order to achieve the above object, the liquid fuel combustion apparatus of the present invention has a high concentration of vaporized liquid fuel that is directly contacted and vaporized by hot air in the vaporization chamber. Along with obtaining the mixed fuel, most of the high-concentration vaporized mixed fuel is mixed with air for temperature and concentration adjustment to form a lean vaporized mixed fuel, and the rest is directly used as the high-concentration vaporized mixed fuel, and both are burned together. It is characterized in that it is configured so as to be sent to and used for combustion.

[0006]

According to the features of the present invention described above, most of the high-concentration vaporized mixed fuel obtained in the evaporation chamber becomes a lean vaporized mixed fuel at an appropriate temperature by the temperature and concentration adjusting air, and a part of the high-concentration vaporized mixed fuel The vaporized mixed fuel is sent to the combustion section as it is. Most of the combustion in the combustion section is a lean mixed fuel that is not high in temperature, so the temperature of the flame is low and the CO and NO _X emissions are suppressed. In addition, since the high-concentration vaporized mixed fuel sent to the combustion section together with the lean vaporized mixed fuel has a stable combustion width that is sufficient for flame blow-off and flashback, the high-concentration vaporized mixed fuel burns together, Blown off as a whole flame,
The stable combustion width against flashback increases.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings. 1 is a vertical sectional front view of a liquid fuel combustion apparatus showing an embodiment of the present invention, FIG. 2 is a vertical sectional side view of a liquid fuel combustion apparatus similarly showing an embodiment of the present invention, and FIG. 3 shows the details of a combustion section. FIG.

An evaporation chamber 42 is formed in the evaporation container 41, and a jet nozzle 43 of the liquid fuel faces the evaporation chamber 42 inside in the vicinity of the central axis of the evaporation container 41. The liquid fuel is sent to the jet nozzle 43 and introduced into the evaporation chamber 42 in the atomized state.
The evaporation container 41 is provided with one hot air inlet port 45 in the tangential direction on the cylindrical wall surface near the end face facing the jet port of the jet nozzle 43, and the hot air introduced from the inlet port 45 is provided. As a result, the liquid fuel sprayed into the evaporation chamber 42 is brought into direct contact with the liquid fuel, and is evaporated and vaporized at a relatively low temperature. At this time, by increasing the amount of the atomized liquid fuel and thereby increasing the temperature of the high temperature air for contact vaporization, a high concentration and high temperature (for example, 250 ℃ to 300 ℃) can be obtained.
The temperature is about the same, and this temperature is high in the category of the method of direct contact vaporization with hot air, but it can be said that it is lower than other vaporization methods. ) A vaporized mixed fuel is obtained. The vaporized mixed fuel thus obtained is sent from the delivery port 46, which is also provided tangentially to the cylindrical wall surface, to the combustion section 47 through the introduction passage 54 and is used for combustion. The hot air inlet
The air heated by the air heater 49 is supplied to 45 through the hot air introduction path 48. The high temperature air introducing port 45 and the air together with the high temperature air introducing passage 48 and the air heater 49 form high temperature air introducing means.

The introduction passage 54 is divided into a large passage 54a and a small passage 54b by a partition 53 from the middle of the introduction passage 54.
An air mixing port 50 for adjusting temperature and concentration is provided in the middle of a so that the air blown by the air supply device 51 passes through the air passage 52 and is blown from the air mixing port 50 to the large passage 54a. Has been done. The air mixing port 50, the air supply device 51, and the air passage 52 constitute temperature and concentration adjusting air mixing means. Most of the vaporized mixed fuel that has entered the introduction passage 54 from the evaporation chamber 42 flows to the large passage 54a side, and is cooled to an appropriate temperature (about 100 to 200 ° C.) by the air from the air mixing port 50. Diluted with
The diluted vaporized mixed fuel indicated by the thick arrow is sent to the combustion section 47. The remaining vaporized mixed fuel flows through the small passage 54b and is sent to the combustion section 47 without being temperature-controlled and diluted.

As shown in FIG. 3, the combustion section 47 is provided with a flame hole portion 47a composed of a main flame hole portion and an auxiliary flame hole portion, and the above-mentioned passage 47b to the main flame hole portion is provided with the flame hole portion 47a. The large passage 54a is connected, and the small passage 54b is connected to the passage 47c to the auxiliary flame hole portion.
Are connected. Therefore, in the main fire hole of the fire hole portion 47a lean vaporized mixed fuel occupying most is burned at a low CO, low NO _X, the auxiliary flame holes remaining high concentration vaporized mixed fuel of the combustion in the main burner ports not It will be burned in a manner that prevents stabilization.

FIG. 4 is a sectional view showing a modification of the combustion section and the introduction passage to the combustion section. In this example,
A partition pipe 55 is formed in a double tube form from the middle of the introduction passage 54, a large passage 54a is formed inside the partition pipe 55, and a small passage 54b is formed around the inside of the introduction pipe 54. The large passage 54a is connected, and the small passage 54b is connected to the passage 57c to the auxiliary flame hole of the flame hole portion 57a of the combustion portion 57. The high-concentration vaporized mixed fuel that has passed through the small passage 54b is sent to the auxiliary flame hole passage 57c from the inside of the combustion section 57.

5 and 6 show another embodiment. FIG. 5 is a vertical sectional view of a liquid fuel combustion apparatus showing another embodiment, and FIG. 6 is a sectional view taken along line CC of FIG. A jet nozzle 61 for jetting vaporized fuel (gas fuel or liquid fuel vaporized) faces the mixed fuel inlet 62 of the combustion section 67.
The fuel ejected from the mixture becomes high-concentration mixed fuel while being mixed with air, and enters the first mixing chamber 65 in the combustion section 67. The first mixing chamber 65 is adjacent to the second mixing chamber 66 via the partition walls 63 on both sides, and the partition wall 63 is provided with a distribution hole 64. A small amount of the high-concentration mixed fuel flows into the second mixing chamber 66 from the distribution hole 64. The air introduction port 70 is opened to the first mixing chamber 65 on the downstream side of the position where the distribution hole 64 is provided, and the air from the air supply device (not shown) is blown into the first mixing chamber 65, so that the high concentration is achieved. The mixed fuel is a diluted mixed fuel. The diluted mixed fuel is guided from the first mixing chamber 65 to the blowing chamber 68 continuing to the center of the flame hole portion 67a, and the flame hole portion 67a.
It is burned as the main flame in the center of a. The second mixing chamber 66
The high-concentration mixed fuel that has entered is burned as an auxiliary flame on both sides of the flame hole 67a as it is.

[0013]

According to the present invention, which has the above-described structure,
According to the liquid fuel combustion apparatus described in (1), the atomized liquid fuel is directly contacted and evaporated by high temperature air in the evaporation chamber to obtain a high concentration vaporized mixed fuel, and the high concentration vaporized mixed fuel is Since most of the air is mixed with temperature and concentration adjusting air to form a lean vaporized mixed fuel and the rest as a high concentration vaporized mixed fuel, both are sent to the combustion section for combustion, so that the combustion section Since most of the combustion is due to the lean mixed fuel that does not have high temperature,
It is possible to achieve clean combustion with low emissions of O and NO _X. In addition, the high-concentration vaporized mixed fuel burns together in the combustion section to form a good auxiliary flame, and it is possible to increase the stable combustion width against blowout and flashback as the entire flame.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a liquid fuel combustion apparatus showing an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a liquid fuel combustion apparatus showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing details of a combustion section.

FIG. 4 is a cross-sectional view showing a modified example relating to a combustion section and an introduction passage to the combustion section.

FIG. 5 is a vertical cross-sectional view of a liquid fuel combustion apparatus showing another embodiment.

6 is a cross-sectional view taken along line CC of FIG.

FIG. 7 is a vertical cross-sectional front view of a conventional device.

FIG. 8 is a vertical sectional side view of a conventional device.

[Explanation of symbols]

 41 Evaporation container 42 Evaporation chamber 43 Jet nozzle 45 High temperature air inlet 46 Outlet 47, 57 Combustion section 50 Air mixing port 53 Partition 54 Inlet passage 54a Large passage 54b Small passage 55 Partition pipe

Claims (1)

[Claims] 1. A highly concentrated vaporized mixed fuel is obtained by directly contacting and vaporizing atomized liquid fuel with high temperature air in an evaporation chamber, and most of the highly concentrated vaporized mixed fuel is temperature-controlled. And a concentration-adjusting air to form a lean vaporized mixed fuel, and the rest as a high-concentration vaporized mixed fuel, both of which are sent to a combustion section for combustion.