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Piping with fluid mixing region

A fluid mixing and piping technology, used in fluid mixers, mixers, gas/liquid distribution and storage, etc., can solve problems such as difficulty in completely preventing temperature interface changes, prevent thermal fatigue, promote mixing, reduce Effects of temperature changes

Inactive Publication Date: 2009-12-30
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, according to the technology described in Patent Document 1, although fluid mixing can be promoted, it is difficult to completely prevent fluctuations in the temperature interface that occurs at various parts of the piping.

Method used

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  • Piping with fluid mixing region
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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0074] Below, refer to figure 1 The first embodiment of the present invention will be described.

[0075] figure 1 A pipe 1 having a fluid mixing region M is shown.

[0076] The pipe 1 is composed of a main pipe (first pipe) 2 and a branch pipe (second pipe) 3 .

[0077] The main pipe 2 is made of metal with an inner diameter D, and high-temperature water (high-temperature fluid) flows from the bottom to the top in this figure.

[0078] The branch pipes 3 are connected in an orthogonal manner with respect to the outer wall of the main pipe 2 . The branch pipe 3 is made of metal, and low-temperature water (low-temperature fluid) having a temperature lower than that of the high-temperature water flowing through the main pipe 2 flows therein. The low-temperature water flowing in the branch pipe 3 flows from the right side to the left side in the drawing, passes through the reducer (inner pipe) 5 , and flows out into the main pipe 2 from the downstream end 5 a of the reducer...

no. 2 approach

[0098] Next, refer to image 3 A second embodiment of the present invention will be described.

[0099] The difference between this embodiment and the first embodiment is that a diameter-reducing portion 5g is provided at the front end portion 5e of the reducer 5, and the rest is the same as that of the first embodiment. Therefore, descriptions of the same structures are omitted.

[0100] like image 3 As shown, on the downstream end side of the front end portion 5e of the reducer 5, a reduced diameter portion 5g having an inner diameter smaller than that on the upstream side is provided. Therefore, the low-temperature water flowing in the branch pipe 3 and introduced into the reducer 5 is further accelerated at the reduced diameter portion 5g. Therefore, the high-temperature water flowing outside the reducer 5 can be prevented from flowing backward into the reducer 5 . Thereby, since the temperature interface does not reach the inside of the reducer 5, the welding wire 5f...

no. 3 approach

[0104] Next, refer to Figure 5 A third embodiment of the present invention will be described.

[0105] The difference between this embodiment and the first embodiment is that an inner cylinder 10 is provided at the front end of the reducer 5 , and the other aspects are the same. Therefore, descriptions of the same structures are omitted.

[0106] like Figure 5 As shown, the inner cylinder 10 is inserted into the inside of the front end part 5e of the reducer 5. The downstream end 10a of the inner cylinder 10 is arranged on the downstream side of the downstream end 5a of the reducer 5 . A gap having an annular cross section is formed between the outer peripheral wall of the inner cylinder 10 and the inner peripheral wall of the front end portion 5e of the reducer 5 .

[0107] According to this embodiment, since the inner cylinder 10 is provided inside the reducer 5, and a gap is formed between the inner peripheral wall of the reducer 5 and the outer peripheral wall of the...

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Abstract

It is intended to, in a piping having a fluid mixing region where fluids of temperatures different from each other mix together, avoid any thermal fatigue attributed to fluctuation of temperature boundary plane. There is provided piping (1) including reducer (5) having its distal end portion (5e) arranged on substantially the central axis line of main pipe (2) and allowing low-temperature water having a temperature different from that of high-temperature water flowing outside the distal end portion (5e) and having a flow velocity lower than that of the high-temperature water to flow therethrough, wherein fluid mixing region (M) where the high-temperature water and the low-temperature water mix together lies downstream of the reducer (5), characterized in that the reducer (5) is provided with weld line (5f) joining the distal end portion (5e) with elbow portion (d) and that the distance between the weld line (5f) and downstream end (5a) is not smaller than the inside diameter (D) of the main pipe (2).

Description

technical field [0001] The present invention relates to a pipe suitable for use in, for example, a nuclear power plant or the like, and having a fluid mixing region for mixing fluids of different temperatures. Background technique [0002] For example, in power plants such as nuclear power plants and thermal power plants, many pipes through which high-temperature water or low-temperature water flow are installed. These pipes are connected to the branch pipes in a manner perpendicular to the main pipe, and there is a fluid mixing area where the low-temperature water flowing through the branch pipes and the high-temperature water flowing through the main pipe converge (of course, it can also be that the low-temperature water flows in the main pipe and the high-temperature water flows in the branch pipes. fluid structure). In such a fluid mixing region, a temperature interface is formed between high-temperature water and low-temperature water, and there is a problem that the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L55/00B01F5/00B01F5/02F17D1/17
CPCB01F5/045B01F2005/0017B01F2025/913B01F25/313
Inventor 近藤喜之谷本浩一铃木盛喜新田义一莲沼俊胜
Owner MITSUBISHI HEAVY IND LTD
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