JPH03168503A - Collision burner - Google Patents

Abstract

PURPOSE:To prevent irregular flow of a flame by oppositely disposing a pair of burners each having an air jet hole on the periphery of a fuel nozzle, and oppositely disposing a pair of air cylinders at positions perpendicularly crossing concentrically with the burners. CONSTITUTION:A pair of left and right burners 4A, 4B and a pair of front and rear air cylinders 8A, 8B are oppositely disposed at the lower part of a combustion chamber 2 on a straight line. They are so perpendicularly disposed that the axis S1 of the burners 4A, 4B and the axis S2 of the cylinders 8A, 8B perpendicularly cross the combustion center O of the chamber 2. Further, the air jet holes of the cylinders 8A, 8B are opposed to those of the nozzle holes of the burners 4A, 4B. With this structure, irregular flow of a flame can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an impingement combustion device that burns fuel injected from a fuel nozzle by colliding with each other.

[Prior Art] As a conventional general spray combustion device, there is a so-called gun type device. In this device, liquid fuel is normally pressurized to 7 kg/1, and is injected and atomized through a rotating nozzle. By installing the flame stabilizer at an appropriate distance in front of the nozzle, a vortex of combustion air and fuel spray can be generated in front of the flame stabilizer, thereby holding the flame. Then, mix the air necessary for combustion from the surrounding area,
It's burning.

Although this type of single spray combustion device has many advantages such as a simple structure, it also has the following disadvantages. That is, first, the flame is formed in a combustion tube with a small diameter in order to improve mixing with air, resulting in uneven combustion flow. Second, if combustion is attempted in a narrow space in the combustion chamber, the fuel may hit the combustion chamber wall before evaporating, causing incomplete combustion. Thirdly, the diameter of the tip of the rotating nozzle is small, and the nozzle may be easily clogged.

Furthermore, fourthly, it is difficult to adjust the fuel injection amount.
T. D. The problem is that it is not possible to increase the ratio of R (turn down ratio).

In order to overcome the drawbacks of the gun-type combustion apparatus, an impingement combustion apparatus has been proposed in which fuel injected from fuel nozzles collides with each other and burns. That is,
In this device, burners with fuel nozzles are placed opposite each other in the combustion chamber, and the flames collide with each other from both sides to maintain the flame. This makes it possible to efficiently utilize the combustion space and even out the temperature distribution. In addition, due to the intense mixing effect caused by collision and internal EGR (mixing effect of burned and unburned parts), excellent combustion characteristics such as less generation of soot and NOx can be obtained. Japanese Patent Application Laid-open No. 56-56511 is presented as a prior art in which fuel nozzles are arranged opposite each other and the atomized fuel collides for the purpose of mixing with air.
.

[Problems to be Solved by the Invention] Incidentally, in the above-mentioned impingement combustion device, a plurality of small air injection holes are provided around the fuel nozzle from which combustion air is blown out. If the opening area of the air nozzle is increased by arranging multiple fuel particles around the fuel nozzle, the air supplied from the air nozzle at a distance from the nozzle will not mix well with the fuel particles. There is a tendency for the combustion characteristics to deteriorate due to the effect of reducing the NO x concentration due to the lack of combustion air in the center.

Another problem with the method of blowing air out from around the fuel nozzle and causing it to collide with each other is that it causes an irregular flow of flame, with the flame extending laterally and coming into contact with the inner wall of the combustion chamber. The problem is that it cannot be suppressed effectively.

The present invention aims to solve the above-mentioned problems in an impingement combustion device.

In the present invention, a pair of burners each having an air jet hole provided around a fuel nozzle are disposed facing each other, and are disposed near a position concentrically orthogonal to the opposing burner. A pair of air cylinders that open air injection holes are arranged facing each other.

[Operation] With the #4 command as described above, in the center of the combustion chamber where the flames from the opposing burners collide and burn, there is combustion air that is blown out from the air jet holes arranged around the fuel nozzle, and a separate Combustion air jetted out in the orthogonal direction from the air jet holes of the air cylinder arranged in the combustion chamber collides with it from all sides, increasing the air mixing effect at the center of the combustion chamber. Furthermore, the combustion air blown out from the direction perpendicular to the opposing burner provides a flame holding effect that confines the impinging flame in the center of the combustion chamber.

[Example] EMBODIMENT OF THE INVENTION Hereinafter, one Example of this invention is illustrated and described.

Fig. } shows a system outline of the collision combustion device according to the present invention. In the figure, ↓ is a combustion vessel shaped like a cylinder, a rectangle, or an intermediate shape between the two, and a combustion chamber 2 is provided inside the combustion vessel.

A heat exchanger 3 is installed in the upper part of this combustion chamber 2, while a pair of left and right burners 4A, 4B and a pair of front and rear air cylinders 8A, 8B are installed in the lower part, penetrating the side wall of the combustion vessel (■). They are inserted and placed opposite each other in a straight line.

The arrangement relationship between the burners 4A, 4B and the air cylinders 8A, 8B is shown in FIG. That is, the air cylinders 8A and 8B added according to the present invention are located near the orthogonal position where the axis S2 connecting them is perpendicular to the axis S1 of the opposing burners 4A and 4B at the center O of the combustion chamber 2 {burner 4A and 4B are arranged facing each other with a phase rotated by (90°±lO°).

As shown in FIG. 3, the burners 4A and 4B are composed of a common unit having an air injection nozzle (fuel nozzle) 5 in the center and a hollow cylindrical air cylinder 6 around the air injection nozzle (fuel nozzle). A nozzle hole 5a for injecting fuel is opened at the tip of the nozzle 5, and a front wall 6a of an air cylinder 6 located around the nozzle hole 5a is for injecting combustion air from the air cylinder 6. A plurality of air ejection holes 7 that eject air in the axial direction are opened concentrically.

On the other hand, as shown in FIG. 4, the air cylinders 8A and 8B are shaped like hollow cylinders, and a plurality of air injection holes 9 for ejecting combustion air in the axial direction are arranged concentrically in the front wall portion 8a of the air cylinders 8A and 8B. Multiple rows are opened.

The burners 4A, 4B and air cylinders 8A, 8B have a first
Necessary fuel and air are supplied from the supply paths shown in the figure.

First, the air injection nozzles 5 of the burners 4A and 4B are provided with a fuel inlet 5b and an air inlet 5c at the base end (a third
(see figure), the fuel inlet 5b is connected to the oil feed pipe 1 which communicates with the oil level regulator 10 and is supplied with fuel (arrow F), while the air inlet 5c is connected via the solenoid valve 13. A blow pipe }4 communicating with the compressor 12 is connected to supply injection air (arrow ao), and fuel is sprayed from the nozzle hole 5a with this injection air. Further, in the air cylinder 6, a blower pipe 16 communicating with the fan 5 is connected to an air inlet 6b (see FIG. 3) provided on the base end side, and combustion air (arrow a, ) is ejected from the front air ejection hole 7.

On the other hand, the air cylinders 8A and 8B have an air inlet 8b (see FIG. 4) provided on the base end side connected to a sending pipe (not shown) that branches from the sending pipe upper 6 and communicates with the fan 15. ) is connected, and the combustion air introduced from here (arrow a2) is ejected from the front air ejection hole 9.

In addition, a pressure supply pipe 17 that guides the air pressure of the injection air supplied from the compressor 2 to the air injection nozzle 5 is communicated with the oil level regulator 10 via an air pressure control valve (8), and the air pressure of the compressor 12 is used to maintain the oil constant. Fuel is supplied to the air injection nozzle 5 from the face plate 10. Further, the fan 5 that feeds combustion air is communicated with the pressure sending pipe {7 via the fan damper 19, and as shown in FIG. The air pressure is controlled by the control device 20 in conjunction with the air pressure control valve l8.

By combining the compressor 12 and the oil level regulator lO in this way, proportional control is realized in which a fuel angle commensurate with the amount of injection air supplied by the compressor l2 is supplied to the air injection nozzle 5, and the control device 20, the air-fuel ratio is automatically adjusted according to the input. In addition, the control device 2
The air amount control of the fan l5 by 0 may be performed by frequency control instead of damper drive.

Next, the operation of the combustion device will be explained.

To start combustion, first start the fan 15, and
In the combustion chamber 2, two ignition electrode rods placed near the burners 4A and 4B create a spark. Next, when the compressor 12 is started and the solenoid valve ↑3 is opened, internal pressure is applied to the oil level regulator 10, and the fuel from the oil level regulator 10 and the injection air from the compressor 12 are supplied to the air injection nozzle 5. The fuel that is supplied and injected in a spray form from the nozzle hole 5a is ignited by a spark. The ignited flames then collide with each other,
The flame spreads in an annular shape near the center of the combustion chamber 2. At this time, the combustion air is supplied to the air cylinder 6 arranged around the nozzle.
, 6 and the air jets ejected from the air nozzles 9 of air cylinders 8A and 8B in a direction perpendicular to them collide violently from all sides in the center of the combustion chamber 2. This promotes mixing with fuel particles. As a result, burned gas and unburned gas are mixed efficiently in the combustion chamber 2, and the internal EGR effect is enhanced. At the same time, the combustion air blown into the center of the combustion chamber 2 from all sides acts to confine combustion in the center of the combustion chamber 2.

Therefore, according to the present combustion apparatus, the opposed burners 4A, 4
Air cylinders 8A and 8 that supply combustion air to B from the orthogonal direction
By adding B, the mixing action and internal EGR effect are increased, and the combustion characteristics of impingement combustion can be further improved. That is, even under conditions of large input, soot and NO x
The tendency for concentration to increase is suppressed. Also, according to this device,
Since collision combustion can be carried out while being confined in the center of the combustion chamber 2, it is possible to effectively avoid problems such as the flame extending laterally and directly exposing the inner surface of the combustion chamber to the flame, and also to prevent the inner surface of the combustion chamber from being directly exposed to the flame. Since complete combustion can be achieved in a narrow combustion space, the temperature distribution in the combustion chamber 2 is made uniform and the heat exchanger 3
The miniaturization of the fuel cell is further promoted, and high-load combustion can be achieved.

FIG. 6 illustrates an embodiment in which the air jet holes 7 opened to the air cylinders 6 incorporated in the burners 4A, 4B are improved. That is, in this case, the air jet holes 7 provided around the nozzle are tilted toward the center ○ of the combustion chamber 2, and the fuel nozzle 5
The aim is to increase the effect of concentrating the combustion air ejected from around the collision center. In this way, the effect of improving the combustion characteristics described above can be doubled. Also, the seventh
The figure shows a modification of the embodiment shown in FIG. Efforts have been made to enhance the effect of concentrating the air. Note that such adjustment of the direction of the air jet holes 7 can also be applied to the air jet holes 9 that are opened to the air cylinders 8A and 8B that are separately arranged to face each other.

Further, in the above embodiment, the air cylinders 8A, 8B and the burner 4A
Although the combustion air blown out from the air cylinders 6, 6 incorporated in the air cylinders 6, 4B is supplied from the common fan 15, the air supply sources for both may be independent. If necessary, the ratio of the amount of air blown out from both sides may be varied.

In the above embodiment, a case where a liquid dormant slope is targeted has been described, but gas fuel can also be used. That is, the same effect can be expected by incorporating a gas nozzle instead of the air injection nozzle and attaching a gas flow rate control valve. Furthermore, instead of the air injection nozzle, an airless nozzle such as a vari-flow nozzle may be used as the fuel nozzle. When using an airless nozzle, proportional control cannot be performed, but for example 0. A 5G/h nozzle is placed in each, 1. It can be used as a combustor with an input equivalent to 0G/H.

[Effects of the Invention] As described above, in the impingement combustion device of the present invention, by arranging the air cylinders from which the air blowing holes face each other in the vicinity of the positions orthogonal to the opposing burners, the collision of combustion air at the center of the combustion chamber is prevented. - The mixing effect is enhanced, and further improvement effects can be obtained especially in reducing harmful emissions such as soot and NOx. In addition, impingement combustion is performed in a narrow space at the center of the combustion chamber, thereby preventing the flame from spreading to the inner wall of the combustion chamber, and improving the uniformity of the combustion chamber temperature.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of an impingement combustion device showing one embodiment of the present invention, Fig. 2 is a plan view showing the arrangement relationship between the burner and the air cylinder, Fig. 3 is an enlarged sectional view of the burner, and Fig. 4 is An air cylinder is illustrated, (a) being an enlarged sectional view and (b) being a front view. FIG. 5 is a detailed view of a portion of FIG. FIGS. 6 and 7 are enlarged cross-sectional views of burners showing other examples of rotation. }... Combustion container 2... Combustion chambers 4A, 4B
... Burner 5 ... Fuel nozzle 6 ... Air cylinder
7... Air jet holes 8A, 8B... Air cylinder 9... Air jet holes S1... Nozzle axis S
2... Air cylinder axis 0... Center of combustion chamber.

Claims (1)

[Claims] 1. A pair of burners with air nozzles provided around the fuel nozzle are placed facing each other, and a pair of air cylinders with air nozzles are placed facing each other and placed near a position concentrically orthogonal to the opposing burners. A collision combustion device characterized in that: