JPS6341625B2 - - Google Patents

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 A fluid ejected from a nozzle nozzle is collided with and reflected by a fluid distributor provided on the downstream side of the nozzle nozzle.
A method and structure for colliding with the subsequent ejected fluid from the nozzle orifice and dispersing it to the outside in a thin film wide-angle umbrella shape are known as Japanese Patent No. 1008187 and Japanese Patent No. 941825. This conventional fluid disperser does not have a guide surface to guide the dispersed flow downstream, so at the moment the dispersed flow leaves the fluid disperser, fluid particles inside the dispersed flow are generated hydrodynamically 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 dry out and become deposited as carbon particles, which will be retained. This will result in interfering with the flame and stable combustion.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to improve the above-mentioned conventional fluid dispersion device, which is particularly suitable for spray dispersion of gas-liquid mixed fuel, and to stabilize the shape of fuel spray dispersion into a combustion furnace.
An object of the present invention is to provide a fluid distributor that can prevent carbon contained in fuel from adhering to the outer periphery of the fluid distributor.

Structure, Effects of the Invention According to the present invention, in a fluid distributor provided on the downstream side of a fluid ejection nozzle, a circular collision surface with which fluid ejected from the fluid ejection nozzle collides is arranged approximately concentrically with the nozzle hole of the nozzle. a dispersion guide surface formed as a substantially conical inclined surface that expands downstream from the outer periphery of the circular collision surface, and whose angle formed by the inclined surface is set to a preselected dispersion angle; A circulation guide surface is provided that 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 a 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. and without separating a part of the fuel dispersed flow back to the negative pressure region hydrodynamically generated around and downstream of the fluid distributor by the dispersed flow along the periphery of the fluid distributor. The foreign matter adhering to the outer periphery of the fluid distributor is removed by guiding the fluid, and the foreign matter is re-involved in the fuel dispersion 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, ultimately maintaining good combustion performance. below,
The present invention will be explained in more detail based on embodiments shown in the accompanying drawings.

Now, in FIG. 1, 1 is a nozzle having a nozzle hole 1a for ejecting a fluid, that is, a gas-liquid mixed fluid F of air or steam and fuel particles. A support rod 3 that supports the vessel 2 is inserted, and an appropriate holder is inserted deep inside.
For example, it is locked by a spider-shaped holder.
Therefore, the fluid distributor 2 is provided on the downstream side of the nozzle hole 1a concentrically with the central axis of the nozzle 1, and includes a collision surface 4 having a cavity C, and a collision surface 4 that is substantially widened toward the downstream from the outer periphery of the collision surface 4. Each part is provided with a conical dispersion guide surface 5 and a spherical guide tip 6 provided in a protruding shape further downstream of the dispersion guide surface 5.

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 stream, receives a dispersion effect, and becomes a dispersed stream _S1 . This dispersed flow S ₁ 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 toward the end allows it to move stably over a wide angle. In the furnace F, dispersed flow
S ₁ is burned, and part of the high temperature gas after combustion is circulated through S ₂
The particles then flow back along the spherical surface of the protruding tip 6, remove unburned particles attached to the spherical surface, and are drawn into _S1 . This backflow circulation flow S ₂ is generated when a part of the high temperature gas flows toward the negative pressure region generated around and downstream of the fluid distributor 2, and the circulation flow S ₂ of the high temperature gas flows toward the protruding tip. Since it flows along the spherical surface of No. 6 without peeling off, it prevents the adhesion of carbon particles and removes the adhering particles. In addition, according to the spherical shape, the area (projected area) on which fuel particles adhere is made as large as possible on the F side of the furnace, making it easier to absorb the heat necessary for incineration of adhering unburned particles. It also exhibits the effect of Now, since the circulating flow S ₂ caught up in the gas-liquid mixed fluid S ₁ is a high-temperature gas containing flame, the ignition and flame holding of the dispersed flow S ₁ is continuously and stably performed.

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 dispersion flow _S
S ₁ ′ is scattered from the main stream like a branch stream S ₃ and is drawn into the surrounding negative pressure area. Therefore, the fuel particles in the branched flow S ₃ 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 S ₂ ' Since there is no flow action along the periphery of the disperser 7 and the particles are separated, it becomes difficult to remove the fuel particles and carbon particles adhering to the periphery, and as shown in FIG. This results in generation and growth, interfering with 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 downstream protruding guide surface having a spherical shape, so that a gas-liquid mixed flow is ejected. The fuel is formed into a dispersed spray stream that burns stably and efficiently in the furnace, and a portion of the high-temperature gas circulates along the protruding guide surface without peeling, which prevents and removes adhesion of carbon particles. At the same time, it effectively achieves ignition and flame holding to achieve complete combustion in the combustion furnace. It goes without saying that the collision surface of 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 cross-sectional view of an embodiment of the fluid distributor according to the present invention, FIG. 2 is a cross-sectional view explaining the action of the fluid distributor, and FIG. 3 is a vertical cross-sectional view showing an example of a conventional fluid distributor. , FIG. 4 is a cross-sectional view showing the state of accumulation of carbon particles adhering to the conventional fluid disperser. DESCRIPTION OF SYMBOLS 1... Nozzle, 1a... Nozzle hole, 2... Fluid disperser, 4... Collision surface, 5... Dispersion guide surface, 6... Guide tip, 7... Conventional fluid disperser, F... Air Liquid mixed fluid, S ₁ ... dispersed flow, S ₂ ... circulation flow.

Claims (1)

[Scope of Claims] 1. In a fluid distributor provided on the downstream side of a fluid ejection nozzle, a circular collision surface with which fluid jetted from the nozzle collides is provided approximately concentrically with the nozzle hole of the nozzle, and the circular collision surface A dispersion guide surface is provided which is formed as a substantially conical inclined surface that widens from the outer periphery toward the downstream side, and the angle formed by the inclined surface is set to a preselected dispersion angle; A fluid dispersing device characterized by being provided with a circulation guide surface which is formed as a substantially spherical protruding surface that is connected to the side and protrudes toward the downstream direction, and allows a part of the dispersion flow to flow in close contact with the 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 cavity in its center.