JPS6057910B2 - Internal/external mixing type atomizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal/external mixing type atomizer, in particular, which atomizes relatively high viscosity fuel such as heavy oil with pressurized steam ejected at high speed, and This invention relates to an atomizer for use as fuel.

Currently, known methods for atomizing various fluids such as fuel oil include an internal mixing method, an external mixing method, a pressure injection method, a rotating cap method, a collision method, and an ultrasonic method.

However, in both of these methods, the viscosity of the fluid is 50°C.
Currently, it can only be applied to low viscosity fluids of 500 centipoise or less. Particularly in the case of boiler fuel, sufficient atomization is required, and its applied viscosity is further reduced. When a conventional atomizer is used in a burner to atomize and burn highly viscous fuel, atomization is poor, so some of the supplied fuel becomes unignited coarse particles and scatters, and the flame becomes unstable. Many problems such as these occurred, making it difficult to put it into practical use.

For this reason, there are many fuels that have a sufficient amount of heat but cannot be used as boiler fuel because of their high viscosity. The present invention improves the conventional internal mixing atomizer and combines it with an external mixing atomizer to provide a burner that sufficiently atomizes highly viscous fuel so that it can be used as boiler fuel. with the aim of
It has the following structure. That is, the present invention provides a fluid flow path to be atomized;
A primary atomization medium flow path, a mixing chamber where the fluid to be atomized and the primary atomization medium are mixed, a mixed fluid jet flow path through which the mixed fluid is jetted, and an opening in the outer periphery of the mixed fluid jet flow path. In an internal/external mixing type atomizer consisting of a secondary atomizing medium jetting passage with holes, the mixing chamber has a cylindrical or hemispherical shape coaxial with the central axis of the mixed fluid jetting passage, and the mixing chamber has a cylindrical or hemispherical shape coaxial with the central axis of the mixed fluid jetting passage; The atomizing medium flow path is provided on the upstream side of the mixing chamber in a tangential direction to the peripheral wall of the mixing chamber so that a swirling flow of the primary atomizing medium occurs in the mixing chamber, and the atomizing medium flow path The flow path is opened to intersect with the primary atomization medium flow path at a substantially right angle, and the secondary atomization medium jetting flow path is configured such that the secondary atomization medium is jetted from the mixed fluid jetting flow path. The present invention is an internal/external mixing type atomizer, characterized in that the mixed fluid is disposed so as to be ejected at an angle of 60 degrees or less immediately after the mixed fluid is ejected.

Hereinafter, the present invention will be specifically described with reference to the drawings.

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, showing an atomized fluid supply path 1 and an atomized fluid flow path 2 through which a fluid to be atomized such as fuel passes, and a primary mist such as pressurized steam. A primary atomizing medium supply path 3 and a primary atomizing medium flow path 4 through which the atomizing medium passes, a mixing chamber 5 in which the fluid to be atomized and the primary atomizing medium are mixed; It basically consists of a mixed fluid jetting channel 6 through which the mixed fluid is jetted, and a secondary atomizing medium jetting channel 7 that is opened in the outer periphery of this jetting channel 6. Furthermore, the assembly structure of the embodiment shown in FIG. 1 is assembled from parts such as a fluid to be atomized supply pipe A1, a primary atomization medium supply pipe B, a mixing nozzle C, a mixing tip D, and a cap E, and the fluid to be atomized is The supply pipe A forms the atomized fluid supply path 1 and at the same time supports the mixing nozzle C, and the primary atomization medium supply pipe B forms the primary atomization medium supply path 3 and at the same time supports the mixing nozzle C1. Mixing tip D and cap E
is fixed.

Further, the mixing nozzle C is connected to the atomized fluid flow path 2 and the first
The mixing chip D has a mixing chamber and a mixed fluid jet flow path 6, and the outer peripheral wall of the mixing chip D and the inner peripheral wall of the cap E create a secondary atomizing medium jet flow. It forms road 7. The mixing chamber 5 has a cylindrical shape (see FIG. 3) or a hemispherical shape (see FIG. 4) having the same axis as the central axis of the mixed fluid jet flow path 6.

FIG. 2 is a diagram showing the mixing nozzle C, and the primary atomized medium flow path 4 is located inside the mixing chamber 5 (the first
, see Figure 3), a swirling flow occurs. It is provided on the upstream side of the mixing chamber 5 in a tangential direction to the peripheral wall of the mixing chamber 5.

Further, the atomized fluid flow path 2 is opened at an appropriate position of the primary atomized medium flow path 4, as shown in FIGS. 2A and 2B. It is provided so that it intersects at an angle close to a right angle.

As shown in FIG. 1, the secondary atomizing medium flow path 7 has a circular slit-shaped opening on the outer periphery of the mixed fluid jetting flow path 6, and the secondary atomizing medium ejected from this hole is mixed. Fluid jet flow path 6
It is provided so that it intersects the jet stream from the jet at an angle of 600 degrees or less. In FIGS. 1 and 3, an example in which the secondary atomized medium flow path 7 has a circular slit shape formed by the outer circumferential wall of the mixing tip D and the inner circumferential wall of the cap E is shown. As shown in the figure, the mixing tip and the cap are integrally formed, and the secondary atomizing medium can be ejected from a number of holes formed therein.

Further, FIG. 1 shows an example in which the atomizing medium flowing through the primary atomizing medium flow supply path 3 is divided into a primary atomizing medium and a secondary atomizing medium within the atomizer. In addition to this, it is also possible to introduce the secondary atomization medium from another supply path and adjust the flow rate independently.

Therefore, different types of fluids may be used as the primary and secondary atomizing media. Atomized fluid flow path 2
The flow path area is 0.5 to 3.0 TrLISeC.
It is preferable that the design is within the range of .

The flow area of the primary atomization medium flow path 4, the secondary atomization medium jet flow path 7, and the mixed fluid jet flow path 6 is set so that the respective flow velocities become the sonic speed or a speed close to the sonic speed. The flow rate of the primary atomization medium is 0.0% by weight relative to the flow rate of the fluid to be atomized.
1-1. It is preferable that the flow rate of the secondary atomization medium is designed to be in the range of 0.1 to 1.0 times the flow rate of the fluid to be atomized. These conditions are determined depending on the physical properties of the fluid to be atomized, the supply pressure of the atomizing medium, the required shape of the fine particle jet, etc. The angle of inclination of the secondary atomizing medium jetting channel 7 needs to be 60 degrees or less with respect to the central axis of the mixed fluid jetting channel 6, preferably 10 to 600 degrees. The diameter of the mixing chamber 5 is 1.5 to 4. It is preferable that the length in the outflow direction is designed to be in the range of 0.5 to 1j times the diameter. In the atomizer of the present invention, at a position where the atomized fluid flow path 2 intersects with the atomized medium flow path 4 and opens, the outflowing atomized fluid is perpendicular to that direction or at an angle close to that direction. And after receiving the first stage atomization effect by the primary atomization medium flowing at the speed of sound or a speed close to it, and then turning into a swirling mixed fluid, a swirling flow is generated from the mixed fluid jetting channel 6. However, by ejecting at the speed of sound or close to it, it is subjected to the second stage of separate atomization, and immediately after this, the second atomization medium is ejected at the speed of sound or close to it at an angle of 60 or less. This atomizer incorporates a three-stage separate granulation mechanism in which particles collide and are subjected to the separate granulation action of the third stage.

In addition, both the primary atomizing medium and the secondary atomizing medium have the function of dividing the fluid to be atomized into separate particles, but in addition, when this atomizer is used as a burner, the primary atomizing medium The atomizing medium has the property of making the resulting flame thick and short, and the secondary atomizing medium has the property of making the flame narrow and long.

Therefore, by adjusting the flow rates of the primary and secondary atomizing media, it is possible to easily determine the flame shape depending on the type of furnace. By using the burner consisting of the atomizer of the present invention, it is possible to achieve 10
It can sufficiently atomize fuel with a high viscosity of 000 centipoise (50°C) or more and provide a stable flame, so the range of boiler fuel selection is extremely wide. Furthermore, heavy oil, asphalt, pitch, etc., which conventionally could not be converted into fuel due to their high viscosity, can be used as boiler fuel, and the effective use of energy is greatly promoted. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a sectional view showing the internal/external mixing type atomizer of the present invention, Figures 2A and b are sectional views and front views of the mixing nozzle, and Figures 3A and b are views of the mixing tip. A sectional view and a front view, FIG. 4 is a sectional view of a modified mixing chip, and FIG. 5 is a front view showing another embodiment.

1... Atomized fluid supply path, 2... Atomized fluid flow path, 3... Atomized medium supply path, 4...
. . . Primary atomization medium flow path, 5 . . . Mixing chamber, 6
...Mixed fluid jetting channel, 7...Second atomizing medium jetting channel.

Claims (1)

[Claims] 1 A fluid to be atomized channel, a primary atomizing medium channel, a mixing chamber where the fluid to be atomized and the primary atomizing medium are mixed, a mixed fluid ejection channel from which the mixed fluid is ejected, and the mixed fluid In an internal/external mixing type atomizer consisting of a secondary atomizing medium jetting passage opened on the outer periphery of the jetting passage, the mixing chamber has a cylindrical or hemispherical shape coaxial with the central axis of the mixed fluid jetting passage. and the primary atomizing medium flow path is tangential to the peripheral wall of the mixing chamber on the upstream side of the mixing chamber so that a swirling flow of the primary atomizing medium occurs in the mixing chamber. The atomized fluid flow path is opened to cross the primary atomization medium flow path at a substantially right angle, and the secondary atomization medium ejection flow path is formed so that the secondary atomization medium flows through the secondary atomization medium flow path. An internal/external mixing type atomizer, characterized in that the mixed fluid jetted from the mixed fluid jetting flow path and the mixed fluid jetted out intersect with each other at an angle of 60 degrees or less immediately after jetting out.