JP2002306939A - Fluid mixer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid mixer which reliably mixes fluids in the state of low pressure loss and discharges the fluids as a uniformly mixed fluid even when the fluids are inhomogeneous in composition, temperature and/or concentration. SOLUTION: The homogeneity of an outlet fluid 6 of this fluid mixer 7 is achieved by disposing short pipes 5 respectively on fluid emitting parts 3a-3d which are disposed on a fluid dividing member 2. The fluids 1 which flow out of the short pipes 5 directly collide against or interfere with one another and generate a flow region of violent turbulence in the neighborhood. Therefore, even when the fluids 1 are inhomogeneous in composition, temperature and/or concentration, the fluids are almost uniformly mixed by being subjected to a passage through the flow region of violent turbulence generated by the fluid dividing member 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to combustion air,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixing device for mixing fluid such as combustion air and exhaust gas, and between exhaust gases, and more particularly to a mixing device capable of greatly promoting mixing of fluids with low pressure loss.

[0002]

2. Description of the Related Art A conventional fluid mixing device 17 disclosed in Japanese Patent Application Laid-Open No. 7-227528 has a structure as shown in FIG. 7 which is a perspective view of FIG. 7 and a sectional view of FIG. The fluid mixing device 17 includes a duct 4 serving as a fluid flow path and a quadrangular pyramid-shaped flow path dividing member 2 installed so as to cross the fluid flow path in the duct 4. Each of the triangular plate surfaces forming the fluid ejection parts 3a to 3a
3d is provided, and the fluid flow flowing through the duct 4 is:
The fluid passes through the fluid ejection portions 3a to 3d.

When the fluid 1 having a non-uniform composition, temperature, and / or concentration passes through the fluid ejection portions 3a to 3d provided on the flow path dividing member 2 of the fluid mixing device 17, the fluid 1 having a non-uniform concentration is obtained. Collide violently with each other and agitate the surrounding areas with each other. For this reason, the fluid 1 is completely mixed and becomes a homogeneous fluid 6.

[0004]

However, in the fluid mixing device 17 of the prior art, consideration is given to the distribution of the composition, temperature, and / or concentration of the fluid 1 at the inlet. In addition, no consideration has been given to the fact that the inflow fluid 1 greatly loses pressure in the quadrangular pyramid-shaped flow path dividing member 2.

In the above-mentioned prior art, the distribution of the composition, temperature, and / or concentration of the fluid 1 at the inlet of the fluid mixing device 17 is not considered, so that the fluid 1 at the inlet has different components. When there is a composition distribution, a concentration distribution of each component, and / or a temperature distribution, there is a problem that the homogeneity of the fluid at the outlet of the fluid mixing device is deteriorated. There is also a problem that the flow of the fluid 1 in the fluid mixing device 17 has a large pressure loss.

[0006] Further, since the flow path of the fluid 6 that has exited the fluid ejection portions 3a to 3d is suddenly expanded, the fluid flow direction is changed, and the fluid 6 is discharged.
The mixing effect due to collision of the particles is reduced. Therefore, the result is that the degree of homogeneity of the homogeneous fluid 6 that has exited the flow path dividing member 2 is low.

[0007] An object of the present invention is to provide a fluid mixing device that ensures that even a heterogeneous fluid having a composition, temperature, and / or concentration, etc., is mixed with a small pressure loss and is discharged as a homogeneous mixed fluid. is there.

[0008]

The above object of the present invention is achieved by a mixing device having the following configuration. That is, in a fluid mixing device for mixing fluids having at least composition components, temperatures and / or concentrations that are inhomogeneous in a duct, a flow channel dividing member having a conical structure for temporarily dividing a fluid flow channel in the duct, and A fluid mixing apparatus in which one or more fluid ejection openings for ejecting a fluid are provided in a flow channel dividing member, and a short pipe is connected to an end of the opening on the downstream side of the fluid ejection opening.

The connection between the opening end of the fluid dividing member fluid and the short pipe of the present invention has a smooth curved surface, so that the fluid flows downstream of the opening without pressure loss and is mixed. .

Further, in order for the fluid to be mixed so as to flow downstream of the opening without causing a pressure loss, the flow section of the fluid dividing member after the outlet of the fluid ejection flow path is not suddenly enlarged. Alternatively, the duct wall surface may be configured so that the cross section of the flow path gradually increases.

In addition, the opening of the flow path dividing member corresponding to at least a portion where the degree of inhomogeneity such as at least the composition of the fluid, the temperature and / or the concentration is large is provided upstream of the openings of the other flow dividing members. This increases the fluid mixing efficiency.

The fluid of the present invention may be composed of different components such as steam and air, fluids having the same composition but different composition ratios (such as the composition ratio of oxygen and nitrogen), temperature and / or concentration, or gaseous substances and liquids. Consists of any fluid.

[0013] The conical fluid dividing member of the present invention includes:
A fluid dividing member having a triangular pyramid, quadrangular pyramid, polygonal pyramid, or conical shape.

[0014]

According to the present invention, by connecting the short pipe to the opening of one or more fluid jets provided in the fluid dividing member, the fluid discharged from the short pipe directly collides or interferes, This creates a very turbulent flow area around it. Therefore, even a fluid having a non-uniform composition or the like is mixed almost uniformly by passing through the highly turbulent flow region. When at least the composition, temperature, and / or concentration of the inlet fluid of the fluid mixing device are not uniform, the position of the fluid ejection opening corresponding to the position where the composition, temperature, and / or concentration is highest or lowest is determined by the fluid dividing member. To the upstream side of the fluid mixing device, the fluid with the highest or lowest composition, temperature and / or concentration flows into the center of the fluid mixing device, resulting in a homogenous fluid at the fluid mixing device outlet.

In the present invention, since the pressure loss of the fluid flowing into the fluid mixing device is reduced by gradually changing the cross section of the fluid flow path, the pressure loss of the flowing fluid can be reduced as a whole.

[0016]

Embodiments of the present invention will be described with reference to the drawings. Fluid mixing device 7 according to an embodiment of the present invention
2 is a perspective view of FIG. 1 and a structure as shown in FIG. 2 which is a cross-sectional view of a main part of FIG. 1. As in the conventional fluid mixing device 17 shown in FIGS. 4 and a quadrangular pyramid-shaped channel dividing member 2 installed so as to traverse the fluid channel in the duct 4. Each triangular plate surface forming the quadrangular pyramid of the channel dividing member 2 has Fluid ejection part 3
a to 3d are provided, and the fluid ejection portions 3a to 3d
Through the fluid flow.

The difference between the fluid mixing device 7 according to the embodiment of the present invention shown in FIGS. 1 and 2 and the conventional fluid mixing device 17 shown in FIGS. That is, the short pipe 5 is connected in the direction in which the fluid flows out to the fluid ejection portions 3a to 3d.

For this reason, when the fluid is a heterogeneous fluid 1 in which at least one of the composition, temperature, concentration, etc. is not uniform throughout, the heterogeneous fluid 1 is a square pyramid-shaped flow installed in the duct 4. When passing through the fluid jetting portions 3a to 3d of the road dividing member 2, they violently collide with each other at the outlet of the short pipe 5,
The heterogeneous fluids 8 at the outlet of the short pipe 5 mix with each other. For this reason, the heterogeneous fluid 1 is completely mixed and becomes the homogeneous fluid 6.

In the prior art fluid mixing device 17 shown in FIGS. 7 and 8, since the short pipe 5 is not connected to the fluid ejection portions 3a to 3d, the flow of the fluid 8 exiting the fluid ejection portions 3a to 3d is enlarged. To reduce the mixing effect due to collisions, and the degree of homogeneity of the homogeneous fluid 6 is low. However, the fluid mixing apparatus of the present invention shown in FIGS. High degree of homogeneity.

FIG. 3 shows another embodiment of a sectional view of the main parts of the fluid jetting parts 3a to 3d of the fluid mixing apparatus of FIG. FIG.
In the example shown in (1), the connecting portion 9 between the fluid ejection portions 3a to 3d and the short pipe 5 has a smooth curved surface. As described above, by smoothly connecting the fluid ejection portions 3a to 3d and the short pipe 5 with the connection portion 9, the pressure loss of the fluid flow due to the contraction of the flow path can be reduced.

FIG. 6 shows a sectional structure of a duct portion of a fluid jetting portion of a quadrangular pyramid-shaped fluid mixing device disclosed in a known example (Japanese Patent Application Laid-Open No. 07-227528) similar to the example shown in FIG. In this known example, in order to reduce the pressure loss of the quadrangular pyramidal fluid mixing device, a base 10 is provided on the upstream surface of the fluid ejection sections 3a to 3d, and the cross section of the base 10 is gradually reduced. In the case of the known example shown in FIG. 6, since the pressure loss of the fluid flow at the base 10 is large, the flow resistance is higher than that of the embodiment of the present invention shown in FIG.

FIG. 4 is a structural diagram of another embodiment of the present invention.
(FIG. 4 is a modification of the side section shown in FIG. 1). The example shown in FIG. 4 is a fluid mixing device in which an outlet duct 11 whose fluid flow path cross-sectional area gradually increases is connected to the outlet of the short pipe 5 of the fluid mixing device 7 shown in FIG. 1 or FIG. By installing this outlet duct 11, it is possible to reduce the pressure loss due to the sudden expansion of the flow path at the outlet of the short pipe 5. The same effect can be obtained by connecting the outlet duct 11 to the outlet of the short pipe 5 of the fluid mixing device 7 shown in FIG.

A fluid mixing device 7 according to another embodiment of the present invention.
5 is shown in FIG. 5 (FIG. 5 is a modification of the side section shown in FIG. 1). In the embodiment shown in FIG. 5, for example, the fluid concentration distribution 12 (the magnitude of the fluid concentration is indicated by the length of the arrow,
Not limited to concentration, composition distribution or temperature distribution may be used.)
When the heterogeneous fluid 1 having the following shape passes through the fluid ejection portions 3a to 3d provided in the quadrangular pyramid-shaped flow path dividing member 2 installed in the duct 4, the fluid ejection portion 3b has a fluid concentration distribution 12
Correspond to the fluid concentration distribution 12 having a higher concentration than the average, so that the fluid ejecting portion 3b is connected to the other fluid ejecting portions 3a, 3c, 3d.
It is provided on the upstream side of the flow path dividing member 2.

By providing the fluid ejecting portion 3b of the portion having a high fluid concentration on the upstream side of the flow dividing member 2 with respect to the fluid ejecting portions 3a, 3c and 3d in this manner, the high-concentration fluid can be supplied to the duct 4 more quickly. By flowing into the center, the fluid concentration can be evenly distributed throughout. Further, even when a fluid concentration distribution has a lower concentration portion than the average value, the same homogeneity can be obtained by moving the fluid ejection portion corresponding to that portion to the upstream side of the flow path dividing member 2. Can be. The configuration shown in FIG. 5 can also be applied to the fluid mixing device 7 shown in FIGS.

According to the configuration of the embodiment of the present invention, homogeneity of the homogeneous fluid 6 at the outlet of the fluid mixing device can be obtained.

[0026]

According to the present invention, since the heterogeneous fluid can be made into a homogeneous fluid with a low pressure loss, the power of the fan can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a fluid mixing device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is a side sectional view of a fluid mixing device according to another embodiment of the present invention.

FIG. 4 is a side sectional view of a fluid mixing device according to another embodiment of the present invention.

FIG. 5 is a side sectional view of a fluid mixing device according to another embodiment of the present invention.

FIG. 6 is a sectional structural view of a duct portion of a fluid ejection part of a conventional fluid mixing device.

FIG. 7 is a perspective view of a conventional fluid mixing device.

8 shows a side sectional view of the fluid mixing device of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Heterogeneous fluid 2 Channel dividing member 3a, 3b, 3c, 3d Fluid ejection part 4 Duct 5 Short pipe 6 Homogeneous fluid 7, 17 Fluid mixing device 8 Short pipe outlet heterogeneous fluid 9 Connection part 10 Base 11 Exit duct 12 Fluid Concentration distribution

Continuation of the front page (72) Inventor ▲ Kuwa Nori 3-2-2 Nakanoshima, Kita-ku, Osaka-shi, Osaka Inside Kansai Electric Power Co., Inc. (72) Inventor Reina Tanaka 3-3-1 Nakanoshima, Kita-ku, Osaka, Osaka 22 Kansai Electric Power Co., Inc. (72) Inventor Satoshi Shishido 6-9 Takaracho, Kure City, Hiroshima Prefecture Babcock Hitachi Co., Ltd. (72) Inventor Masato Mukai 6-9 Takaracho Kure City, Hiroshima Prefecture Babcock Hitachi, Ltd. F-term in Kure office (reference) 4G035 AB02 AC01

Claims (4)

[Claims] 1. A fluid mixing apparatus for mixing fluids having at least composition components, temperatures and / or concentrations that are inhomogeneous in a duct, wherein a flow path of a conical structure for temporarily dividing a fluid flow path in the duct is provided. A fluid characterized in that one or more fluid ejection openings for ejecting a fluid are provided in the member and the flow path dividing member, and a short pipe is connected to an end of the opening on the downstream side of the fluid ejection opening. Mixing device. 2. The fluid mixing device according to claim 1, wherein the connecting portion between the opening end of the fluid dividing member fluid and the short pipe has a smooth curved surface. 3. The fluid dividing member according to claim 1, further comprising a duct wall having a gradually increasing flow path cross section so that the flow path cross section after the fluid ejection flow path outlet portion of the fluid dividing member does not suddenly expand. Fluid mixing installation. 4. A fluid mixing device, wherein an opening of a flow path dividing member corresponding to a portion where the degree of fluid heterogeneity is large is provided upstream of openings of other flow path dividing members.