JPS59228964A - Fluid diffuser - Google Patents

Abstract

PURPOSE:To stabilize the spraying condition of fuel into a combustion furnace and to prevent sticking and accumulation of carbon by forming the guiding surface of a fluid diffuser into a specific shape. CONSTITUTION:The gaseous mixture composed of gas and liquid ejected from a nozzle 1 collides and reflects against and on a circular collision surface 4 and collides against the succeedingly ejected flow between an ejecting hole 1a and circular collision surface 4, thereby forming diffusing flow S1. The flow S1 is diffused stably at a wide angle alpha by the guiding effect of a divergent diffusing and guiding surface 5. The flow S1 burns in a furnace F and a part of the high temp. gas flows backward in the form of circulating flow S2 along the spherical surface of a projecting end 6 and sticks on the spherical surface, thereby removing unburned particles which are intruded into the flow S1. The intruded flow S2 is the high temp. gas contg. a flame and therefore the ignition and flame stabilization of the flow S1 are continuously and stably accomplished.

Description

TECHNICAL FIELD The present invention relates to a fluid distributor that causes fluid ejected from a nozzle to collide and disperse in a thin film over a wide angle, and more particularly to a fluid distributor that forms a gas-liquid mixed fuel fluid into a dispersed flow.

Prior Art Fluid ejected from the nozzle hole of a nozzle collides with and is reflected by a fluid distributor provided downstream of the nozzle hole.

The method and structure for colliding with the subsequent ejected fluid from the nozzle nozzle hole and dispersing it to the outside in a thin film wide-angle umbrella shape are disclosed in Patent No. 1.
No. 008187 and patent no. 941825. This conventional fluid disperser does not have a guide surface that guides the dispersed flow downstream, so the moment the dispersed flow leaves the fluid disperser, fluid particles inside one dispersed flow are hydrodynamically generated around the outer circumference of the disperser. If the fluid is a gas-liquid mixed fuel fluid, the surrounding combustion heat will cause it to become dried carbon particles that will adhere to the disperser and become flame-holding and stable. This will result in hindering combustion.

OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to improve the above-mentioned conventional fluid dispersion device so as to be particularly suitable for spray dispersion of gas-liquid mixed fuel.

It is an object of the present invention to provide a fluid distributor that can stabilize the shape of fuel spray dispersion into a combustion furnace and prevent carbon contained in the fuel from adhering to the outer periphery of the fluid distributor.

Structure 1 of the Invention Effects According to the present invention, in the fluid distributor provided on the downstream side of a fluid ejection nozzle, a circular collision surface on which fluid ejected from the fluid ejection nozzle collides is approximately concentric with the nozzle hole of the nozzle. a dispersion guide surface formed as a substantially conical inclined surface expanding downstream from the outer periphery of the circular collision surface, and with the angle formed by the inclined surface set to a preselected dispersion angle;
Further, a circulation guide surface is provided which is connected to the downstream side of the dispersion guide surface and is formed as a substantially spherical protruding surface that protrudes toward the downstream direction, and allows a part of the dispersion flow to closely flow the reverse circulation flow. A fluid distributor is provided.

If a fluid ejection nozzle having the fluid distributor of the present invention configured as described above is installed in a combustion furnace and used for spray dispersion of gas-liquid mixed fuel, stabilization of the shape of fuel spray dispersion in the combustion furnace can be achieved. In addition, the reverse circulation flow of a part of the fuel dispersed flow to the negative pressure region hydrodynamically generated around and downstream of the fluid distributor due to the dispersed flow is guided without separation along the periphery of the fluid distributor. Remove foreign matter attached to the outer periphery of the fluid disperser and re-involve it into the fuel dispersed flow.

By merging them together, it is possible to prevent the carbon contained in the fuel from adhering to the outer periphery of the fluid distributor, and ultimately to maintain a good combustion effect. below.

The present invention will be explained in more detail based on embodiments shown in the accompanying drawings.

Now, in FIG. 1, reference numeral 1 denotes a nozzle having a nozzle hole 1a for ejecting a fluid, pure air, or a gas-liquid mixed fluid F of steam and fuel particles. A support rod 3 supporting the fluid distributor 2 is inserted, and a suitable holder is inserted deep inside.

For example, it is locked by a spider-shaped holder.

The fluid distributor 2 is therefore provided on the downstream side of the nozzle hole 1a concentrically with the central axis of the nozzle 1 and has an impingement surface 4. Each part of a substantially conical dispersion guide surface 5 which is formed in a shape that widens toward the downstream from the outer periphery of the collision surface 4, and a spherical guide tip 6 provided in a protruding shape further downstream of the dispersion guide surface 5. Equipped with:

According to the above configuration, as shown in FIG. 2, the gas-liquid mixed fluid F ejected from the nozzle 1 collides with the circular collision surface 4 and is reflected, and the subsequent collision occurs between the nozzle hole 1a and the circular collision surface 4. It collides with the jet flow and undergoes a dispersion action, becoming one dispersed flow Sl. This dispersed flow SR is stably dispersed by the dispersion guide surface 5 while maintaining a desired dispersion angle α.

In other words, the guide action of the dispersion guide surface 5 that widens at the end allows it to move stably over a wide angle. In the furnace P, one dispersed flow S1 is burned, and a part of the high-temperature gas after combustion becomes a circulating flow S2 and flows back along the spherical surface of the protruding tip 6, removing unburned particles attached to the spherical surface. I get caught up in S. This reverse circulation flow S2
This occurs when a part of the high temperature gas flows toward the negative pressure area generated around and downstream of the fluid distributor 2, and the circulating flow S2 of the high temperature gas is separated along the spherical surface of the protruding tip 6. Since it flows without causing any damage, it prevents the adhesion of carbon particles and removes any adhering particles. In addition, according to the spherical shape, the area on which fuel particles adhere (projected surface @) is shaped so that it is as large as possible on the F side of the furnace to absorb the heat necessary to incinerate the attached unburned particles. It also has the effect of making it easier. Now, since the circulating flow S2 involved in the gas-liquid mixed fluid sl is a high-temperature gas containing a flame, it is possible to continuously and stably perform one dispersion flow 810 and a large holding flame.

Referring now to a conventional fluid distributor, as shown in FIG. 3, the fluid distributor 7 does not have a fluid distribution guide surface. Therefore, the particles existing inside the single dispersion flow sl' are scattered from the main flow of the single dispersion flow B11 at the outer circumferential end 9 of the collision surface 8 like a branch flow S3, and are drawn into the surrounding negative pressure region. Therefore, the fuel particles in the branched flow s3 adhere to the periphery of the fluid distributor 7, and since the protruding tip on the downstream side of the fluid distributor 7 is cylindrical and does not have a spherical surface, the circulating flow 82' is transferred to the fluid distributor 7. It is difficult to remove the fuel particles and carbon particles attached to the surrounding area because the fuel particles and carbon particles peel off without flowing along the periphery of the carbon particle, and as shown in FIG. This results in growth and hinders flame-holding and stable combustion.

As is clear from the above description, according to the present invention, the fluid disperser is provided with a substantially conical dispersion guide surface and a protruding guide surface on the downstream side having a spherical shape. Dispersion v where the fuel ejected as combusts stably and efficiently in the furnace
It is formed into a mist flow, and a part of the high-temperature gas circulates along the protruding guide surface without causing separation, effectively achieving ignition and flame holding while preventing and removing carbon particles. Complete combustion is achieved in the combustion furnace. It goes without saying that the collision surface in the fluid distributor according to the present invention can also be effectively applied to those having a flat surface or a hollow structure as disclosed in Japanese Patent No. 1008187 or No. 941825. Further, the dispersion angle α formed by the dispersion guide surface 5 is appropriately selected depending on the internal volume of the furnace and the like.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the fluid distributor according to the present invention, and FIG. 2 is a sectional view illustrating the action of the fluid distributor.
Figure 3 is a vertical sectional view showing an example of a conventional fluid distributor;
The figure is a cross-sectional view showing the state of accumulation of carbon particles attached to the conventional fluid disperser. 1... Nozzle, 1a... Nozzle hole. 2... Fluid disperser, 4... Collision surface. 5... Dispersion guide surface, 6... Guide tip, 7...
- Conventional fluid disperser, F... gas-liquid mixed fluid. 81... Dispersed flow, 82... Circulating flow. Patent Applicant Mitsubishi Grecision Co., Ltd. Patent Application Agent Akira Aoki Patent Attorney Kazuyuki Nishidate Patent Attorney Kyo Nakayama Patent Attorney Akira Yamaguchi 1st Part 1-2 111--1 Figure 4 n

Claims (1)

[Scope of Claims] 1. In a fluid distributor provided on the downstream side of a fluid ejecting nozzle, a circular collision surface with which fluid ejected from the nozzle collides is tilted approximately concentrically with the nozzle hole of the nozzle, and the circular collision surface A dispersion guide surface is provided, which is formed as an inclined surface that expands into a substantially conical shape from the outer periphery of the surface toward the downstream side, and the angle formed by the inclined surface is set to a preselected dispersion angle, and the dispersion guide surface is A fluid distributor characterized in that a circulation guide surface is provided, which is formed as a substantially spherical projecting surface that is connected to the downstream side and projects toward the downstream direction, and allows a part of the dispersed flow to closely flow a reverse circulation flow. . 2. The fluid distributor according to claim 1, wherein the circular collision surface is formed as a plane facing the ejected fluid. 3. The fluid distributor according to claim 1, wherein the circular collision surface has a hollow portion at its center.