JPH0641798B2 - Gas-liquid two-phase fluid distributor - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a gas-liquid two-phase fluid distributor, particularly a distributor used for distributing a steam / water two-phase fluid in a boiler, or a refrigerant or various gas in a chemical process. The present invention relates to a distributor provided in a heat exchanger that handles a liquid two-phase fluid.

2. Description of the Related Art A conventional gas-liquid two-phase fluid distributor will be described with reference to FIGS. 2 and 3.

In these figures, one end of the cylindrical container 21 is closed,
The other end has a smaller diameter and the inflow pipe 22 is fluid-tightly connected. A large number of outflow holes 23 are radially formed from the center of the cylinder on the side wall of the cylindrical container 21.
Outflow pipes 24 whose center is on the same cross section perpendicular to the axis of the cylindrical container 21 are fluid-tightly connected to the respective 23.

Then, the cylindrical container 21 is installed so that its closed end face is upward and the inflow pipe 22 is downward, and the gas-liquid two-phase fluid flows into the cylindrical container 21 from below through the inflow pipe 22. The gas-liquid two-phase fluid is separated into gas and liquid inside the cylindrical container 21 due to the difference in density between gas and liquid, and a liquid surface 25 is formed at the level of the outflow hole 23.

There are bubbles in the liquid below the liquid surface 25, and since the liquid splashes up when the bubbles break from the liquid surface 25 and rise, the liquid droplets exist in the gas above the liquid surface 25. Liquid level 25
The amount of bubbles below directly flowing out to the outflow pipe 24 and the amount of liquid droplets on the liquid level 25 directly outflowing to the outflow pipe 24 are relatively small compared to the whole, and each outflow pipe 24 is mainly on the liquid level 25. From the liquid, and liquid from below the liquid surface 25 flows out through the outflow hole 23.

In such a conventional distributor, the gas and the liquid of the gas-liquid two-phase fluid flowing in from the inflow pipe 22 are uniformly mixed, or even if they are distributed, with respect to the axis of the inflow pipe 22. In the case of symmetry, that is, the entire circumference is uniform, the cylindrical container 21
The inner state of the liquid is also uniform around the entire circumference, and although the liquid surface 25 may have heights in the radial direction, the liquid surface 25 has the same height in the circumferential direction, and the height of the liquid surface 25 relative to the outflow hole 23 is equal to that of all outflows. Hole 23
About the same. Therefore, the amount of gas and liquid flowing out to each outflow pipe 24 is the same in all outflow pipes 24, and the gas-liquid two-phase fluid is evenly distributed to each outflow pipe 24.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in such a conventional distributor, when there is a bend in the middle of the inflow pipe 22, for example, a liquid having a high density is generated on the outside of the bend due to the centrifugal force at the bend. The gas having a low density has a curved flow that is biased toward the inner side. However, when the gas and the liquid flow into the cylindrical container 21 while being biased in this way, the liquid level 25 is also biased and the total flow is lost. The circumference is not uniform.
25 is low, almost all of this outflow hole 23 is on the liquid level 25,
The liquid surface 25 is high on the side of the outflow hole 23 on the opposite side, and almost all of the outflow hole 23 is below the liquid surface 25. In this case, a large amount of gas flows out to the outflow pipe 24 and the outflow pipe 24 on the opposite side.
However, since a large amount of liquid flows out, there is a problem that the gas-liquid two-phase fluid cannot be uniformly distributed.

Therefore, in order to solve the above-mentioned problems, the present invention, in order to solve the above-mentioned problems, vertically stands a cylindrical container with an upper end closed, connects an inflow pipe to the lower end thereof, and connects the side wall of the cylindrical container to the center of the cylinder. In a gas-liquid two-phase fluid distributor having a large number of radially extending outflow holes and connecting an outflow pipe to each of these outflow holes, an inner cylinder having a diameter smaller than that of the cylindrical container and having an upper end closed It is arranged concentrically in the container, has its lower end connected to the inflow pipe, and has a large number of small holes formed in a portion of the inner cylinder side wall above the outflow hole.

By such means, the uneven flow of the gas-liquid two-phase fluid flowing in from the inflow pipe is made uniform inside the inner cylinder due to the flow resistance of the many small holes formed in the side wall of the inner cylinder. And is further homogenized by the flow resistance when flowing through the annular space formed between the outer surface of the inner cylinder and the inner surface of the cylindrical container through the small holes. In addition, since many small holes are formed in the side wall of the inner cylinder above the outflow hole, even if the gas-liquid two-phase fluid flows backward without the inflow pipe, the flow fluctuation in the outflow pipe is increased. There is no.

Embodiment An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, the cylindrical container 11 is the same as the conventional one, the upper end is closed, and the lower end has a smaller diameter so that the inflow pipe is
12 are fluid-tightly connected. And this cylindrical container 11
A large number of outflow holes 13 are radially formed in the lower part of the side wall of the cylinder from the center of the cylinder, and outflow pipes 14 are fluid-tightly connected to these outflow holes 13, respectively. This outflow hole 13 and outflow pipe
The arrangement of 14 in the cross section is similar to the conventional distributor.

Then, inside the cylindrical container 11, an inner cylinder 16 having a diameter smaller than that of the cylindrical container is concentrically arranged so that its closed upper end is located above the level of the outflow hole 13,
Moreover, the lower end thereof is fluid-tightly connected to the inflow pipe 12. A large number of small holes 17 are formed in the inner cylinder side wall above the outflow holes 13 at a uniform density in the circumferential direction and the axial direction of the inner cylinder 16.

Therefore, the gas-liquid two-phase fluid flowing from the inflow pipe 12 to the inner cylinder 16 in one direction is made uniform inside the inner cylinder due to the flow resistance of the many small holes 17 formed in the side wall of the inner cylinder 16. Further, the liquid surface 15 is further homogenized by the flow resistance when flowing through the annular space 18 formed between the outer surface of the inner cylinder 16 and the inner surface of the cylindrical container 11 through the small hole 17. Have the same height for all outflow holes 13, and the gas-liquid two-phase fluid is evenly distributed to all outflow pipes 14.

Even if the gas-liquid two-phase fluid flows backward in the inflow pipe 12, the outflow pipe
It does not increase flow fluctuations at 14. That is, the flow of the gas-liquid two-phase fluid is inherently accompanied by pulsation, and the flow rate of gas or liquid may increase or decrease, and sometimes flow backward, but the liquid level 15 is the outflow hole 13 of the annular space portion 18. Since this position is lower than the small hole 17 formed in the side wall of the inner cylinder 16, even if a backflow occurs in the inflow pipe 12, it is accumulated below the liquid surface 15 of the annular space portion 18. The liquid does not flow back into the inflow pipe 12 through the small hole 17.

Therefore, when the gas-liquid two-phase fluid is flowing backward in the inflow pipe 12, the fluid below the liquid level 15 flows out to the outflow pipe 14, but the liquid level 15 does not go below the lower edge of the outflow hole 13, and When the gas-liquid two-phase fluid becomes a forward flow in the inflow pipe 12 through the small hole 17 and enters the annular space 18, the gas is directly discharged from the outflow hole 13 to the outflow pipe 14.
The liquid drops onto the liquid surface 15 to raise the liquid surface 15 and flow out from the outflow hole 13 to the outflow pipe 14. Thus, the liquid level 15
The reverse flow of the gas-liquid two-phase fluid in the inflow pipe 12 does not increase the flow rate fluctuation in the outflow pipe 14 because there is almost no decrease in the flow rate.

EFFECTS OF THE INVENTION As described in detail above, according to the present invention, a large number of small holes formed in the side wall of the inner cylinder and each of the annular spaces formed between the outer surface of the inner cylinder and the inner surface of the cylindrical container. Due to the flow resistance, the gas-liquid two-phase fluid can be made uniform without any deviation, and the gas-liquid two-phase fluid can be evenly distributed to all the outflow pipes. Moreover, since many small holes are formed in the inner cylinder side wall portion above the outflow hole, even if the gas-liquid two-phase fluid flows backward in the inflow pipe, it is possible to increase the flow fluctuation in the outflow pipe. Absent.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional view showing an example of a gas-liquid two-phase fluid distributor according to the present invention, and FIG. 2 is a vertical sectional view showing a conventional gas-liquid two-phase fluid distributor. The drawing is a sectional view taken along the line III-III in FIG. 11 …… Cylindrical container, 12 …… Inflow pipe, 13 …… Outflow hole, 14 ……
Outflow pipe, 15 …… liquid level, 16 …… inner cylinder, 17 …… small hole, 18 ……
Ring space part.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Kenjiro Yamamoto Inventor Kenjiro Yamamoto 2-5-1, Marunouchi, Chiyoda-ku, Tokyo Sanryo Heavy Industries Co., Ltd. (56) References: Jikho Sho 56-1600 (JP, Y2)

Claims (1)

[Claims] 1. A cylindrical container having a closed upper end is erected vertically, an inflow pipe is connected to the lower end thereof, and a large number of outflow holes are radially formed in the side wall of the cylindrical container from the center of the cylinder so that the outflow holes flow out to the respective outflow holes. In a gas-liquid two-phase fluid distributor in which pipes are connected to each other, an inner cylinder having a diameter smaller than that of the cylindrical container and having an upper end closed is concentrically arranged in the cylindrical container, and the lower end thereof is the inflow pipe. A gas-liquid two-phase fluid distributor characterized in that a large number of small holes are formed in a portion of the inner cylinder side wall above the outflow hole.