JPS5963406A - Liquid fuel burning apparatus - Google Patents

Abstract

PURPOSE:To obtain a liquid fuel burning apparatus which is capable of reducing noise, atomizing liquie fuel into fine particles promoting combustion of fuel by increasing the fuel vaporizing speed and also promoting mixing of fuel and air with a simple structure. CONSTITUTION:A single-hole nozzle 1 is disposed at the central part in an air supply sleeve 2, and combustion air from a fan 3 is supplied from an opening 5 of the sleeve 2 to a burning section while cooling the nozzle 1 in the air supply sleeve 2. On the other hand, liquid fuel pressurized by a pump 6 is ejected from the outlet of the nozzle 1 and collides onto a baffle member 8 having a circular collision surface 7 located on the outside of the opening 5 while keeping straight and smooth jet flow of fuel. The baffle member 8 is fixed to the nozzle 1 by means of a support member 9 in the manner that the liquid fuel collides at the central part of the collision surface 7. With such an arrangement, it is enabled to provide a liquid fuel burning apparatus which is capable of reducing noise and preventing generation of forced flow of turbulent air.

Description

Detailed Description of the Invention Field of Application of Industry-1- The present invention 117t, liquid twisting +l that atomizes and burns the liquid
This relates to combustion equipment, and such equipment is used in industrial boilers, heaters, heat furnaces, consumer boilers, heaters, etc.

The growth of the IL US example to +1 and its problems A conventional swirl-type pressure spray burner will be explained.

Figure 1 is an example of an L-swivel type pressure spray burner.

Reference numeral 1 denotes a nozzle, which is provided inside the blower tube 2. Combustion air from the blower 3 is supplied to the combustion section through the blower tube 2 while being swirled by the swirling vane 4 provided 1'' between the ends of the blower tube 2. On the other hand, the spray ejected from the nozzle 1 has a spray angle of about 40 to 9 degrees, and mixes with the combustion air to form a conical flame.

The disadvantage of this method is that the spray and air travel in approximately the same direction, so the flow velocity in the combustion section where fuel and air coexist is high.
The flame is easy to lift.

In order to prevent this drawback, a flame-holding mechanism is created by creating a circulating flow of air using the swirling vanes 4.

In addition, this swirl vane 4 is used to improve the poor mixing of air and spray flowing in approximately the same direction, and to completely improve the difficulty of combustion of a pressure swirl nozzle with a large particle size of 50 to 60 microns. The strong swirling turns into flames, making it extremely noisy.

As described above, the conventional method requires a flame-holding mechanism and a means for forcibly mixing the spray and air, making the structure complicated and generating a large amount of noise.

Purpose of the Invention The purpose of the present invention is to atomize liquid with a simple structure, increase the vaporization rate of fuel and make it easier to burn, and also to facilitate the mixing of fuel and air to prevent the generation of forced turbulent air. This is the realization of a low-noise liquid fuel combustion device that does not require Another purpose is to obtain a simple structure that does not have a flame-holding mechanism that has been intentionally used in the past.

Structure of the Invention The present invention sends pressurized fuel oil to a nozzle to generate a linear jet stream. The jet flow is initially a smooth flow, but gradually becomes an oscillating flow and then a split flow. The impactor of the present invention is provided in the smooth flow region closest to the nozzle. The reason for this is that the splitting flow region and the oscillating flow region are unstable and the distance between the nozzle and the rust protrusion becomes long, making it difficult to set the exact position of the impactor. It has occurred. The split/fine particles spread as a substantially disk-shaped spray film on the extension of the liquid film.

The key point of the present invention is to provide a nozzle inside a combustion air cylinder, and to provide an impactor outside the opening of the cylinder so that the disk-shaped thin spray film faces the combustion air flow. O That is, since the combustion air hits the surface of the spray film (plane in the nozzle direction) at right angles, the air velocity at the surface of the spray film decreases rapidly. At the same time, air is supplied to the entire spray film, and the air easily enters the spray.

Furthermore, since the spray film is thin and disc-shaped, air is easily mixed into the entire spray.

Since the particle size obtained by this collision atomization mechanism is extremely fine, the vaporization and combustion rate are extremely fast.The combustion phenomenon in this situation is described below. Because of this, the flame at the interface between the air and the spray film is easily stabilized. That is, this is because a region where the flow velocity is lower than the combustion velocity is generated on the surface of the spray film. In other words, the spray film functions as a flame-holding plate.

The broken combustion air easily enters the spray, resulting in a good mixture of air and fuel and less soot.

Furthermore, since the particle size is small, the flame stabilization generated at the interface is a blue flame, which has the effect of preventing soot as a combustion intermediate product from being deposited on the collision body.

Description of examples An embodiment of the present invention will be described with reference to FIG.

Reference numeral 1 denotes a single-hole nozzle, which is provided at the center inside the blower tube 2 . Combustion air is supplied from the blower 3 to the combustion section through the open section 5 while cooling the nozzle 1 inside the blower tube 2.

On the other hand, in pump 6...pressurized liquid fuel f・1
-1, the collision body 8 is ejected from the outlet of the nozzle 1 and has a circular collision surface 7 located outside the opening 1 of the linear smooth flow. This collision body 8 is fixed to a support 9 and the nozzle 1, and is adjusted so that the liquid flow hits the center of the collision surface 7.

After the collision, the liquid flow becomes a substantially disk-shaped liquid film flow and a spray flow and spreads. This spray stream is actually a circular disc as shown in the figure, and its tip is spread downstream by the combustion air. When ignited by an igniter (not shown) in such a state, a flame is generated in the middle of the spray film, that is, in the portion where the spray spreads in a substantially disk shape. This flame is a blue flame generated at the interface between the above-mentioned spray film surface and air. This flame becomes a stable flame-holding state, and all of the surrounding spray rapidly vaporizes, so the spray disappears and becomes a mixture of gas and air, and their combustion products, which flow downstream in the direction of the flame. change.

On the other hand, (on the back side of the spray film (in the opposite direction of the nozzle 1) JJI air or flame is recirculated to promote vaporization of the spray from the back side of the spray film.

Next, another embodiment will be described with reference to FIG.

Nozzle 1. A rectifying plate 12 having a large number of combustion air holes 10 and a liquid flow through hole 11 in the center is provided between the open part 6 of the blast tube 2 that surrounds it and the collision body 8. The combustion nitrogen holes 10 of the baffle plate 12 rectify the air in the blower tube 2, thereby further reducing the turbulence of the combustion flame and reducing noise.Compared to FIG. Air rushes into the spray film, improving the mixing of the spray and air and promoting combustion. Further, even if the swirl vane or other flame stabilizing mechanism described in the conventional example is added, it does not impair the effects of the present invention and can further improve the performance. It is also possible to separately obtain Lj.

Effects of the Invention The liquid fuel combustion device using the present invention does not lose any of the advantages of heavy oil resistance and instant ignition and extinguishing properties, which are the hallmarks of spray combustion, and the spray itself has the effect of a VC flame-holding plate. Therefore, a device with a simple structure can be realized. In addition, since the spray with small particle size due to collision atomization and combustion air can be mixed without turbulence, V is low! It also has an effect called noisiness that could not be achieved with conventional simple burners. This effect is further enhanced by the embodiment Q shown in FIG.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional example, FIG. 2 is a block diagram showing one embodiment of the present invention, and FIG. 3 is a block diagram showing another embodiment of the present invention. 1...nozzle, 2...blow tube, 4...
...Swivel vane, 6...Opening, 8...Collision body, 12...Brightening plate. Name of agent: Patent attorney Toshio Nakao and 1 other person @
1 Figure 2

Claims (2)

[Claims] (1) A linear liquid stream is ejected from the tip of the nozzle,
A colliding body is provided in the Tm region of the preliquid distribution flow, facing the liquid flow, and the nozzle is provided in a blower tube that communicates with a blower to supply combustion air to the combustion section, and the colliding body is placed in the opening of the blower tube. 1. Liquid fuel combustion device installed outside. (2) A liquid incineration device is placed in the center between the opening section of the blast tube and the impactor.