JP3202589B2 - Mixer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mainstream gas comprising a gas to be mixed such as a high-temperature steam which needs to be cooled and a mainstream gas such as a low-temperature steam for reducing the temperature in a steam supply facility. A short distance from the downstream gas consisting of the gas to be mixed,
The present invention relates to a mixer for producing a mixed gas having a uniform temperature distribution without drift.

[0002]

2. Description of the Related Art In order to use a high-temperature gas generated for a main purpose for a sub-purpose different from that of a main apparatus, the high-temperature gas may be used at a reduced temperature. For example,
The high-temperature steam generated by the steam generator attached to the gas turbine installed for power generation is supplied to the steam turbine that generates power, the main purpose of which is to generate electricity together with the gas turbine. For example, when high-temperature steam is reduced in temperature and used as cooling steam for a secondary purpose such as cooling.

[0003] Such a high-temperature steam is preferably cooled by using a mixer that injects and mixes a low-temperature steam for temperature reduction into the high-temperature steam, but at present, such a mixer includes: A baffle plate or a perforated plate may be installed in a mixed steam flow in which high-temperature steam and low-temperature steam are mixed. However, the mixer provided with such a baffle plate or a perforated plate has disadvantages in that the pressure loss of the mixed steam increases, the weight increases and the size increases, and vibration may occur during operation.

[0004] A mixer shown in FIG. 5 is conceivable as a mixer free from such a problem as pressure loss and the like, in consideration of an extension of the prior art. That is, high-temperature steam 01
In the main flow pipe 02 through which the steam flows, the temperature reducing steam pipe 03 is disposed coaxially and coaxially with the main flow pipe 02, and a large number of circular openings are formed in the temperature reducing steam pipe 03. 04, mainstream pipe 0
A mixer 01 which injects and mixes the low-temperature steam 05 into the high-temperature steam 01 flowing through the inside 2 to reduce the temperature of the high-temperature steam 01.
0. For the sake of simplicity, a description has been given of an example in which the high-temperature steam 01 flows through the main flow pipe 02, and the low-temperature steam 05 flows by providing a temperature-reducing steam pipe 03 inside the main flow pipe 02. 05 may be reversed.

However, such a round opening 0
In the mixer 010 in which the low-temperature steam 05 is injected into the high-temperature steam 01 from 4, the low-temperature steam 05 injected from the opening 04 forms a cylindrical jet as shown in FIG.
The force acting on the jet, as shown in FIG.
Resultant force F of axial force F ₁ and inertia force F ₂ of jet
_Since the swirling force cannot be generated in both the high-temperature steam 01 and the low-temperature steam 05 for which the temperature is to be reduced, there is a problem that the mixing property between the low-temperature steam 05 and the high-temperature steam 01 is inferior. That is, the high temperature steam 01 and the low temperature steam 05 are
There is a problem that the mixed steam is not sufficiently mixed in a short distance and a drift occurs.

[0006]

SUMMARY OF THE INVENTION The present invention solves the problems of a conventional mixer or a mixer which can be considered as an extension of the conventional technology. In addition, a sufficient mixing can be performed at a short distance, and in order to prevent drift of the gases to be mixed with each other, the mixing gas, which is a gas that mixes with the flow direction of the main flow gas to be mixed, is used. It is an object of the present invention to provide a mixer that injects flowing gas in an oblique direction to generate a swirling flow.

[0007]

Therefore, the mixer of the present invention has the following means. (1) A mainstream pipe for flowing a mainstream gas composed of a high-temperature gas that produces a uniform mixed gas whose temperature is reduced by mixing, or one of a high-temperature gas and a low-temperature gas whose temperature is reduced is provided. (2) The mainstream gas is coaxially arranged in the mainstream pipe, and the mainstream gas flows along the outer periphery, and a subflow gas composed of one of a low-temperature gas and a high-temperature gas different from the mainstream gas flows thereinto and is introduced into the mainstream pipe. A follower tube was provided to allow for this. (3) The subflow gas is bored in the subflow pipe in a direction inclined with respect to the axial direction of the subflow pipe, and is inclined from the flow direction of the main flow gas flowing along the outer periphery of the subflow pipe to eject the subflow gas. Slots,
A plurality were provided in the circumferential direction of the follower tube in the same direction. The elongated holes have an elongated ratio increased in the flow direction of the mainstream gas, and may be rectangular or oval in shape.

Since the mixer of the present invention employs the above-described means, the pressure loss of the mixed gas obtained by mixing the mainstream gas and the downstream gas in the mixer provided with the baffle plate or the perforated plate is increased, and the mixing of the mixer is increased. Obviously, the disadvantage of increasing the weight or increasing the size is eliminated, and the long hole for ejecting the downstream gas in the mainstream gas is inclined with respect to the flow direction of the mainstream gas, that is, the axial direction of the downstream and mainstream pipes. Therefore, the downstream gas ejected from the long hole becomes a plate-like jet having a component in a direction perpendicular to the flow direction of the mainstream gas, and is injected into the mainstream gas. As a result, a swirling flow is generated in the mainstream gas, and mixing with the injected downstream gas is promoted. The mainstream gas and the downstream gas can be completely mixed over a short distance, and the temperature difference can be improved. Flow, that is, the occurrence of drift can be prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the mixer of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a first embodiment of a mixer of the present invention, and FIG. 2 is a partial side view showing details of a follower pipe shown in FIG.

As shown in FIG. 1, a main stream pipe 2 provided with a 90 ° bend and flowing a high temperature steam 1 as a main stream gas is coaxial with the main stream pipe 2 and has a low temperature steam 3 as a substream gas.
Is provided. Alternatively, the low-temperature steam 3 may be caused to flow as the mainstream gas into the mainstream pipe 2, and the high-temperature steam 1 may be caused to flow into the downstream pipe 4 as the subordinate gas.

As shown in FIG. 2, the follower tube 4 disposed at the axial portion of the mainstream tube 2 has a slender ratio in which the longitudinal direction is inclined with respect to the axial direction of the follower tube 4. An enlarged rectangular long hole 5 is formed. This long hole 5 is composed of a plurality of holes drilled at equal pitch over the entire circumference of the follower pipe 4,
Two sets are provided in the longitudinal direction of the follower pipe 4.

In the mixer 10 according to the present embodiment having the above-described configuration, the high-temperature steam 1 flowing into the main flow pipe 2 is bent at 90 ° at the bent portion of the main flow pipe 2, and then the outer periphery of the downstream flow pipe 4 is formed. It flows parallel to the axial direction of the downstream pipe 4. On the other hand, the low-temperature steam 3 flowing into the downstream pipe 4 passes through the inside of the downstream pipe 4 penetrating the bent portion of the main flow pipe 2, and is ejected from the long hole 5 into the high-temperature steam 1.

The elongated hole 5 is formed in a rectangular shape having a large slenderness ratio, and its longitudinal direction is the flow direction of the high-temperature steam 1,
That is, by being provided to be inclined with respect to the axial direction of the sub-flow pipe 4 and the main flow pipe 2, the high-temperature steam 1
The jet of the low-temperature steam 3 ejected into the inside becomes plate-shaped (strip-shaped) as shown in FIG. 3, and the inertia force having a component in a direction orthogonal to the direction of the flow of the high-temperature steam 1 causes the high-temperature steam 1 to flow.
To generate a swirling flow. That is, as shown in FIG.
The jet cross section 11 of the low-temperature steam 3 ejected from the long hole 5 has an inertial force 12 in the upward direction perpendicular to the plane of the paper, and the component 14 in the jet cross section width direction of the inertial force 13 from the high-temperature steam 1 acting on the jet cross section 11. , And a component 15 in the vertical direction of the jet width, a swirling flow is generated in the high-temperature steam 3.

As described above, the plate-shaped low-temperature steam 3 having a temperature difference from the high-temperature steam 1 is sprayed into the high-temperature steam 1 while giving a swirling force and mixed with the high-temperature steam 1 through the long hole 5. Sufficient mixing with the steam 3 can be performed. Thus, it is possible to prevent the mixed steam 6 flowing out of the mainstream pipe 2 from having a drift with a different temperature difference.

In the above-described embodiment, the rectangular elongated hole 5 having a large slenderness ratio is used. However, in order to reduce the outflow resistance of the low-temperature steam 3, the elongated hole 5 is formed to have an oval shape with a curvature at an end. Can also be. Further, a long hole 5 provided over the entire circumference of the follower pipe 4 is
Although a set is shown, one set or three or more sets may be provided.

[0016]

As described above, according to the mixer of the present invention, (1) the high-temperature gas and the low-temperature gas which are mixed to generate a mixed gas having different temperatures by the structure shown in the claims. Short mixing (short time) for sufficient mixing
And the occurrence of drift can be prevented. (2) The structure is simple and the cost can be reduced. (3) Since no baffle plate, perforated plate, or the like is provided for mixing, the pressure loss of the mixed gas can be reduced, and the weight and size of the mixer can be prevented from increasing.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of a mixer of the present invention,

FIG. 2 is a side view showing details of the follower pipe shown in FIG. 1;

FIG. 3 is a view showing a jet of low-temperature steam from a long hole shown in FIG. 2;

FIG. 4 is a force diagram acting on the jet in the direction of arrows AA shown in FIG. 3,

FIG. 5 is a side view showing one example of a mixer according to the related art;

6 is a schematic view of a jet of low-temperature steam from the opening shown in FIG. 5,

FIG. 7 is a force diagram acting on the jet shown in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High temperature steam as mainstream gas 2 Mainstream pipe 3 Low temperature steam as substream gas 4 Substream tube 5 Slot 6 Mixed steam

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F01K 17/04 B01F 3/02 B01F 3/04 F01D 25/00 F01K 7/20 F01K 5/02

Claims (1)

(57) [Claims] 1. A mixer for mixing a high-temperature gas with a low-temperature gas to generate a uniform temperature-reduced mixed gas, comprising: a main-stream pipe through which a main-stream gas composed of one of the high-temperature gas and the low-temperature gas flows; A sub flow pipe that is coaxially disposed in the pipe and that flows a sub flow gas composed of one of a low-temperature gas and a high-temperature gas different from the main flow gas; A mixer comprising: a plurality of elongated holes perforated in a flow tube in the same direction and injecting the sub-flow gas into the main flow gas flowing around the outer periphery of the sub-flow tube.