JPS6057909B2 - Internal mixing atomizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal mixing type atomizer, in particular, which mixes comparatively high viscosity fuel such as heavy oil with pressurized steam etc. ejected at high velocity to atomize it, thereby producing boiler fuel. Regarding an atomizer that can be used as an atomizer.

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, at present, these methods can only be applied to low-viscosity fluids whose viscosity is 500 centipoise or less at 50°C. 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, the atomization is poor, so some of the supplied fuel becomes unignited coarse particles and scatters, and the flame becomes unstable. A number of problems arose, and it was 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 purpose of the present invention is to provide a burner that sufficiently atomizes highly viscous fuel so that it can be used as boiler fuel by improving the conventional internal mixing type atomizer. Take composition.

That is, the present invention provides an internal mixing type atomizer consisting of a fluid to be atomized passage, an atomized medium passage, a mixing chamber in which the fluid to be atomized and the atomized medium are mixed, and a mixed fluid jetting passage. is cylindrical or hemispherical with the same central axis as the jetting channel, and the atomizing medium channel is formed on the peripheral wall of the mixing chamber on the upstream side of the mixing chamber so that a swirling flow of the atomizing medium occurs within the mixing chamber. This internal mixing type atomizer is characterized in that the atomized fluid flow path is provided in a tangential direction to the atomized medium flow path and is opened to cross the atomization medium flow path at a substantially right angle.

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

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and shows an atomized fluid supply path 1 and an atomized fluid flow path 2 through which a fluid to be atomized such as fuel is sent, and atomization of pressurized steam and the like. Basically, there is an atomization medium supply path 3 and an atomization medium flow path 4 through which the medium passes, one mixing chamber 5 where the fluid to be atomized and the atomization medium are mixed, and one jetting flow path 6 from which the mixed fluid of both is jetted out. It's becoming a target.

The assembly structure of the embodiment shown in FIG. 1 is assembled from parts such as an atomized fluid supply pipe A, an atomized medium supply pipe B, a mixing nozzle C, and a cap D. The atomizing medium supply pipe B forms the atomizing fluid supply path 1 and at the same time supports the mixing nozzle C, and the atomizing medium supply pipe B forms the atomizing medium supply path 3 and at the same time fixes the cap D. Further, the mixing nozzle C has a fluid to be atomized passage 2 and an atomized medium passage 4, and the cap D has a mixing chamber 5 and a jetting passage 6. The mixing chamber 5 has a cylindrical shape coaxial with the central axis of the jet flow path 6 or a hemispherical shape as shown in FIG.

FIG. 2 is a diagram showing the mixing nozzle C, and the atomizing medium flow path 4 is located inside the mixing chamber 5 (first, third
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 so as to generate a swirling flow (see figure).

Further, the atomized fluid flow path 2 is opened at an appropriate position in the atomized medium flow path 4 as shown in FIGS. 2A and 2B, and the atomized fluid flow path 2 is
It is provided so as to intersect at an angle close to perpendicular to the central axis of.

The flow path area of the atomized fluid flow path 2 has a speed of 0.5 to 3
．． Force hooks designed to be in the 07TLISeC range are preferred.

The flow area of the atomization medium flow path 4 is designed so that the flow velocity is at or near the sonic speed, and is 0.3 to 1.0 times the flow rate of the fluid to be atomized by weight. Preferably, the atomizing medium is designed to flow. The flow area of the jet flow path 6 is such that the flow velocity of the mixed fluid j is at or near the sonic speed, and the length of the flow path is 0.5 to 2. @
Preferably, it is designed to be The diameter of the mixing chamber 5 is 1.5 to 4.0 times the diameter of the jet flow path 6, and the length in the outflow direction is within a range of 0.5 to 1 times the diameter. It is preferable to design it so that 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. The atomization medium flows at the speed of sound or close to it, and undergoes the first stage atomization action, and then turns into a swirling mixed fluid. By ejecting at a speed close to that, the second stage atomization mechanism is incorporated into one atomizer.Therefore, by using a burner consisting of the atomizer of the present invention, , 10,000 centipoise (5 centipoise), which was impossible with conventional technology.
Since 0 can sufficiently atomize up to highly viscous fuel of C) or higher and provide a stable flame, the range of boiler fuel selection is extremely wide. In addition, 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 explanation of the drawing]

Fig. 1 is a sectional view showing the internal mixing type atomizer of the present invention, Fig. 2 is a sectional view showing the internal mixing type atomizer of the present invention;
Figures A and b are a sectional view and a front view of the mixing nozzle, and Figure 3 is a sectional view of a modified cap. 1... Atomized fluid supply path, 2... Atomized fluid flow path, 3... Atomized medium supply path, 4...
...Atomizing medium flow path, 5...Mixing chamber, 6...
...Ejection channel.

Claims (1)

[Claims] 1 In an internal mixing type atomizer consisting of a fluid to be atomized passage, an atomized medium passage, a mixing chamber where the fluid to be atomized and the atomized medium are mixed, and a mixed fluid jetting passage, the mixing chamber is the jetting passage. The 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 atomizing medium occurs within the mixing chamber. provided for, and
An internal mixing type atomizer characterized in that the fluid flow path to be atomized has an opening that intersects the atomization medium flow path at a substantially right angle.