JPH09280009A - Mixer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixer which mixes high temperature gas with low temperature gas which can eliminate pressure loss and an increase in weight and size of the mixer, can mix gas in a short distance (short period of time) completely, and can prevent the occurrence of eccentric stream of gas having differed temperature. SOLUTION: A mixer consists of a main stream pipe 2 in which main stream gas 1 made of either of high temperature gas and low temperature gas to be mixed flows, a follow-up stream pipe 4 in which follow-up stream gas 3 made of either of high temperature gas and low temperature gas which is different from the main stream gas 1 flows and which is arranged in the main stream pipe 2 co-axially, and a long hole which is inclined in the direction of shaft center of the follow-up stream pipe 4, is drilled in the same direction in the follow-up stream pipe 4, and jets follow-up stream gas 3 in main stream gas 1. Consequently, a turn stream is generated in main stream gas 1 which flows on outer periphery of the follow-up stream pipe 4 in the direction of shaft center of the follow-up stream pipe 4 due to jetting of follow-up stream gas 3 so that main stream gas 1 can be mixed with follow-up stream gas 3 in a short distance completely to prevent the occurrence of eccentric stream in mixed gas 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mainstream gas composed of a mixed gas such as high temperature steam which requires temperature reduction and a mainstream gas such as low temperature steam for temperature reduction which performs temperature reduction in steam supply equipment. A short distance from a follow-up gas consisting of mixed gases,
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 hot gas produced for a main purpose for a secondary purpose different from the purpose of a main apparatus, the hot gas may be used after being decompressed. 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, which is the main purpose of power generation, to generate power with the gas turbine, as well as the high temperature part of the gas turbine. For example, when the high temperature steam is reduced in temperature to be used as the cooling steam for a secondary purpose such as cooling the steam.

[0003] It is preferable to perform such temperature reduction of the high temperature steam by using a mixer for injecting and mixing the low temperature cooling low temperature steam into the high temperature steam, but at present, as such a mixer, It is conceivable to install a baffle plate or a perforated plate in the flow of mixed steam in which high temperature steam and low temperature steam are mixed. However, a mixer having such a baffle plate or a perforated plate has drawbacks that the pressure loss of the mixed vapor increases, the weight increases and the size increases, and vibration may occur during operation.

As a mixer without such a problem of pressure loss, considering the extension of the conventional technique, the mixer shown in FIG. 5 is conceivable. That is, high temperature steam 01
In the mainstream pipe 02 through which the water flows, a steam cooling pipe 03 for temperature reduction is arranged coaxially with the mainstream pipe 02, and a large number of round openings are formed in the steam pipe 03 for temperature reduction. From 04, mainstream pipe 0
Mixer 01 for injecting low temperature steam 05 into high temperature steam 01 flowing in 2 to mix it, and lower the temperature of high temperature steam 01
0. In order to simplify the description, the example in which the high temperature steam 01 is caused to flow through the mainstream pipe 02 and the low temperature steam 05 is provided by providing the temperature reducing steam pipe 03 inside the mainstream pipe 02 has been described. 05 may be reversed.

However, such a round opening 0
In the mixer 010 configured to inject the low temperature steam 05 from the No. 4 into the high temperature steam 01, the low temperature steam 05 injected from the opening 04 forms a cylindrical jet flow as shown in FIG.
As shown in FIG. 7, the force acting on the jet flow is high temperature steam 01.
The resultant force F of the axial force F ₁ and the jet inertial force F _2
Since the swirling force cannot be generated in both the high-temperature steam 01 and the low-temperature steam 05 that reduce the temperature, there is a problem in that the low-temperature steam 05 and the high-temperature steam 01 are poorly mixed. That is, the high temperature steam 01 and the low temperature steam 05 are
There is a problem that the mixed vapor is not sufficiently mixed in a short distance and a drift occurs.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the problems of the conventional mixer or the mixer considered as an extension of the conventional technology. Therefore, there are no parts that increase the pressure loss, there is little vibration, and the size and weight are small. In addition, in order to prevent uneven flow of the gases that mix with each other and to allow sufficient mixing in a short distance, it is a gas that mixes in the direction of the flow of the mainstream gas that is the mixed gas. An object of the present invention is to provide a mixer in which flowing gas is injected 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 is provided through which a mainstream gas that mixes and cools to generate a uniform mixed gas, or a mainstream gas composed of one of the high-temperature gas and the low-temperature gas that cools down. (2) The mainstream gas is arranged coaxially in the mainstream pipe, and the mainstream gas is caused to flow along the outer circumference, and the low-temperature gas or the high-temperature gas, which is different from the mainstream gas, is caused to flow inside and introduced into the mainstream pipe. A follow-up pipe that can be used is provided. (3) A secondary gas is jetted in a direction inclined with respect to the axial direction of the secondary tube and jetted with a secondary gas inclined from the flow direction of the primary gas flowing along the outer periphery of the secondary tube. Long hole
A plurality of follower tubes are provided in the same direction in the circumferential direction. The elongated hole has a slenderness ratio that is increased in the flow direction of the mainstream gas, and may be rectangular or oval in shape.

Since the mixer of the present invention has the above-mentioned means, in a mixer having a baffle plate or a perforated plate, the pressure loss of the mixed gas of the mainstream gas and the subsidiary gas is increased, and the mixer In addition to eliminating the problem of weight increase or size increase, the elongated holes for ejecting the mainstream gas follower gas are inclined with respect to the mainstream gas flow direction, that is, the axial direction of the follower pipe and the mainstream pipe. Therefore, the subsidiary gas ejected from the elongated hole becomes a plate-shaped jet having a component in a direction orthogonal to the flow direction of the mainstream gas, and is injected into the mainstream gas. As a result, a swirl flow is generated in the mainstream gas, mixing with the injected subsidiary gas is promoted, the mainstream gas and the subsidiary gas can be completely mixed in a short distance, and the temperature difference can be different. Flow, that is, the occurrence of uneven flow can be prevented.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the mixer of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a first embodiment of a mixer of the present invention, and FIG. 2 is a partial side view showing details of the follower pipe shown in FIG.

As shown in the figure, inside the mainstream pipe 2 which is bent by 90 ° and through which the high temperature steam 1 as the mainstream gas flows, the low temperature vapor 3 as a subsidiary gas is coaxial with the mainstream pipe 2.
A follower tube 4 for flowing the current is disposed. The low temperature steam 3 may be caused to flow in the main flow pipe 2 as the main flow gas, and the high temperature steam 1 may be caused to flow in the sub flow pipe 4 as the follower gas.

As shown in FIG. 2, the follower tube 4 arranged at the axial center of the mainstream tube 2 has a slenderness ratio in which its longitudinal direction is inclined with respect to the axial center direction of the follower tube 4. A large rectangular elongated hole 5 is formed. The long holes 5 are made of a plurality of holes formed at equal pitches 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 of the present embodiment having such a configuration, the high temperature steam 1 flowing into the mainstream pipe 2 is bent 90 ° at the bent portion of the mainstream pipe 2, and then the outer periphery of the follower pipe 4 is bent. It flows parallel to the axial direction of the follower pipe 4. On the other hand, the low-temperature steam 3 that has flowed into the secondary flow pipe 4 passes through the inside of the secondary flow pipe 4 that penetrates the bent portion of the main flow pipe 2 and is ejected from the long hole 5 into the high-temperature vapor 1.

The long 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.
In other words, the high-temperature steam 1 is introduced from the long hole 5 by being provided so as to be inclined with respect to the axial direction of the subsidiary flow pipe 4 and the main flow pipe 2.
The jet stream of the low-temperature steam 3 ejected inside has a plate shape (belt shape) as shown in FIG. 3, and due to the inertial force having a component in the direction orthogonal to the flow direction of the high-temperature steam 1, the high-temperature steam 1
A swirl flow is generated in. 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 an upward direction perpendicular to the paper surface, and the inertial force 13 from the high-temperature steam 1 acting on the jet cross section 11 has a component force 14 in the jet cross-section width direction. , And a component force 15 in the vertical direction of the jet flow width generate a swirling flow 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 from the long hole 5 while giving a swirling force to the high-temperature steam 1 and mixed, whereby the high-temperature steam 1 and the low-temperature steam 1 Sufficient mixing with the steam 3 is possible. This can prevent the mixed steam 6 flowing out of the mainstream pipe 2 from having drifts with different temperature differences.

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, this is formed into an oblong shape having a curvature at the end. It is also possible. Further, the long hole 5 provided all around the follower pipe 4 is provided in the flow direction of the high-temperature steam 1 by 2
Although a set is shown, one set may be provided, or three or more sets may be provided.

[0016]

As described above, according to the mixer of the present invention, the high temperature gas and the low temperature gas, which are (1) mixed to generate a mixed gas having different temperatures, according to the constitution described in the claims. A good distance for short distance (short time)
It is possible to prevent uneven flow. (2) The structure is simple and the cost can be reduced. (3) Since a baffle plate, a perforated plate or the like for mixing is not installed, 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 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.

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

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

FIG. 5 is a side view showing an example of a conventional mixer.

FIG. 6 is a schematic diagram of a jet flow of low-temperature steam from the opening shown in FIG.

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

[Explanation of symbols]

 1 High temperature steam as mainstream gas 2 Mainstream pipe 3 Low temperature steam as follower gas 4 Follower pipe 5 Long hole 6 Mixed steam

Claims (1)

[Claims] 1. A mixer for mixing a high temperature gas with a low temperature gas to generate a reduced temperature uniform mixed gas, and a main flow pipe for flowing a main flow gas consisting of one of the high temperature gas and the low temperature gas, and the main flow. A sub-stream pipe which is coaxially disposed in the pipe and flows a sub-stream gas consisting of one of a low-temperature gas different from the main-stream gas or a high-temperature gas, and the sub-stream pipe inclined from the axial direction of the sub-stream pipe. A mixer comprising: a plurality of elongated holes that are bored in the same direction in a flow tube and that inject the auxiliary gas into the main gas that flows around the outer circumference of the auxiliary tube.