CN107180659B - Variable resistance type pipeline flow speed limiting device - Google Patents
Variable resistance type pipeline flow speed limiting device Download PDFInfo
- Publication number
- CN107180659B CN107180659B CN201710321571.9A CN201710321571A CN107180659B CN 107180659 B CN107180659 B CN 107180659B CN 201710321571 A CN201710321571 A CN 201710321571A CN 107180659 B CN107180659 B CN 107180659B
- Authority
- CN
- China
- Prior art keywords
- pipeline
- flow
- impeller
- flow rate
- fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000012530 fluid Substances 0.000 claims abstract description 31
- 238000009434 installation Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000005484 gravity Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000002826 coolant Substances 0.000 description 9
- 238000001816 cooling Methods 0.000 description 4
- 239000002915 spent fuel radioactive waste Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/02—Details of handling arrangements
- G21C19/04—Means for controlling flow of coolant over objects being handled; Means for controlling flow of coolant through channel being serviced, e.g. for preventing "blow-out"
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
- G21C15/14—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from headers; from joints in ducts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a variable resistance type pipeline flow rate limiting device which is used for limiting the flow rate of fluid in a pipeline. When the pipeline breaks, the flow velocity of the internal fluid increases, the component force perpendicular to the impeller blades generated by the fluid also increases, so that the rotating speed of the flow-limiting impeller increases, the turbulence effect is enhanced, the flow area of the pipeline is reduced, the resistance increases, and the purpose of reducing the flow velocity of the fluid is realized. And has the characteristic of larger flow resistance when the flow speed is larger. Through preset different flow limiting impeller gravity or friction coefficients, the relation between the resistance increasing value and the flow velocity increasing value can be obtained, and different requirements are met. The device does not need to be provided with a transmission mechanism, has simple structure and high reliability, and can generate larger safety benefit and economic benefit when used in a nuclear power plant.
Description
Technical Field
The invention relates to the technical field of nuclear power plant system equipment, in particular to a variable resistance type pipeline flow rate limiting device.
Background
A large number of pipelines exist in various main and auxiliary systems of the nuclear power plant, and a conveying path is provided for equipment, cooling reactors, cooling spent fuel and the like. Wherein most of the pipelines are of the medium-low flow rate and medium-high flow rate type, once the pipeline breakage accident occurs, the coolant in the main coolant system of the nuclear power plant is sprayed out from the breakage parts, and the loss of the coolant threatens the cooling of nuclear fuel and simultaneously causes impact on system equipment. The capacity requirement of the emergency water replenishing system to be equipped is greatly determined by the speed of losing fluid after the pipeline is broken, and the stronger the flow speed is, the stronger the emergency water replenishing system needs to be configured, and the higher economic cost is needed.
If the nuclear power plant has the worst large-fracture water loss accident (Large Break Loss Of Cooling Accident, LB LOCA), the high-energy pipeline is broken, the temperature of the coolant is up to 300 ℃ and the pressure is above 15Mpa, the original water content of the reactor water system is quickly lost in a critical flow mode, and the reactor water system is almost completely emptied in a few seconds, so that necessary measures are needed to limit the flow discharged from the broken part, but the safety of the nuclear power plant is not influenced as much as possible. In the case of a rupture accident of a water supply pipeline of a spent fuel pool, although the loss speed of water content is relatively slow, the water supply means is single, and the conditions of pool boiling, spent fuel exposure and the like are still most likely caused.
In order to minimize the rate of water loss after a rupture event, it is desirable to provide a device that limits the flow rate of the fluid in the conduit.
Disclosure of Invention
The invention aims to provide a device capable of limiting the flow rate of fluid in a pipeline.
In order to achieve the above object, the present invention provides a variable resistance type pipeline flow rate limiting device for limiting the flow rate of a fluid in a pipeline, which comprises a fixing member, a supporting member and a flow limiting impeller, wherein the fixing member is fixed with the pipeline, one end of the supporting member is fixed on the fixing member, the other end of the supporting member extends into the pipeline, and the flow limiting impeller is rotatably installed at the other end of the supporting member.
Compared with the prior art, the variable resistance type pipeline flow rate limiting device provided by the invention realizes the purpose of reducing the flow rate by utilizing the inherent performance of the impeller. When the pipeline breaks, the flow speed of the fluid in the pipeline is higher than the rated speed of the pipeline, and the force applied to the blades of the flow-limiting impeller by the fluid is increased, and the component force perpendicular to the blades is correspondingly increased, so that the rotating speed of the flow-limiting impeller is increased. When the rotation speed of the flow-limiting impeller is increased, the turbulence effect generated in the fluid is more obvious, so that the actual flow area of the pipeline is reduced, the resistance of the pipeline is increased, and the aim of reducing the flow speed of the fluid is finally achieved. The variable resistance type pipeline flow rate limiting device does not need a transmission mechanism, and has simple structure and high reliability. And the flow resistance is larger when the flow speed is larger, and the relation between the resistance increasing value and the flow speed increasing value can be obtained by presetting different flow limiting impeller weights or friction coefficients, so that different requirements are met. The variable resistance type pipeline flow rate limiting device has higher feasibility, and can generate higher safety benefit and economic benefit when being used for a nuclear power plant.
Preferably, the fixing member has an annular structure with a shape corresponding to that of the pipe. The shape of the fixing piece corresponds to the shape of the pipeline, so that the influence of the fixing piece on the fluid in the pipeline is reduced, the fixing piece can be conveniently installed on the pipeline, and the fixing piece is firmer after installation.
Specifically, the fixing member is fixed to the inner wall of the pipe.
Specifically, the fixing member is fixed between two adjacent pipes.
Specifically, the resistance-variable pipeline flow rate limiting device comprises a plurality of supporting pieces, one ends of the supporting pieces are fixed on the fixing piece at intervals, the other ends of the supporting pieces are connected and fixed together, and the flow limiting impeller is arranged at one end of the supporting pieces, which is connected with each other. The plurality of support members jointly bear the flow-limiting impeller to disperse the force exerted by the flow-limiting impeller in the fluid.
Preferably, the fixing member and the supporting member are integrally formed. The integrally formed fixing piece and the supporting piece are structurally more rigid, so that the flow-limiting impeller can bear fluid impact to a greater extent after being installed.
Preferably, the axis of rotation of the restrictor impeller is parallel to the flow direction of the fluid in the conduit.
Specifically, the axis of rotation of the flow restricting impeller coincides with the central axis of the conduit.
Preferably, the flow-limiting impeller comprises a mounting part and a plurality of blades fixed on the mounting part, and the blades and the rotation axis of the flow-limiting impeller form an included angle. The greater the included angle, the greater the component of the fluid perpendicular to the blades and therefore the greater the resistance in the conduit due to the rotation of the restrictor impeller.
Drawings
Fig. 1 is a schematic plan view of a variable resistance type pipe flow rate limiting device according to the present invention.
Fig. 2 is a schematic structural view of a flow restricting impeller in the present invention.
FIG. 3 is a schematic diagram of a force analysis of a flow restricting impeller in a fluid.
FIG. 4 is a schematic illustration of the location of a variable resistance conduit flow rate restriction device in a nuclear power plant.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
When a pipe of a reactor nuclear power plant breaks and loses water, the primary coolant is rapidly lost through the break, and the fluid velocity in the pipe is often far above its rated value. At this time, if the fluid velocity in the pipeline can be limited, the loss velocity of the reactor water loading can be reduced, so that the accident deterioration is slowed down, the accident handling time is won, and the capability requirement on the safety injection system is greatly reduced.
As shown in fig. 1 and 2, the present invention provides a variable resistance type pipe flow rate limiting device 1 for limiting the flow rate of fluid in a pipe, comprising a fixing member 11, a supporting member 12 and a flow limiting impeller 13.
The fixing piece 11 is fixed with the pipeline, and the fixing piece 11 is of an annular structure with a shape corresponding to that of the pipeline. The supporting members 12 are of a long rod-shaped structure, the number of the supporting members 12 is three, one ends of the three supporting members 12 are fixed on the inner side of the fixing member 11 at intervals, and the other ends of the three supporting members 12 extend into the pipeline and are connected and fixed together. One end of the three support members 12, which are fixedly connected to each other, is located at the center of the pipe. The three support members 12 are uniformly spaced on the fixing member 11, and the angle between the adjacent two support members 12 is 120 degrees.
The flow-limiting impeller 13 includes a mounting portion 131 and a plurality of blades 132 fixed to the mounting portion 131, and specifically, the number of the blades 132 in the present embodiment is four. The mounting portion 131 is rotatably mounted at one end of the three support members 12 fixed to each other, and the rotation axis of the flow restricting impeller 13 coincides with the central axis of the pipe.
The fixing member 11 and the supporting member 12 are integrally formed, and the mounting portion and the vane 132 are integrally formed, so that the structural rigidity and the pressure-bearing capacity of the variable resistance type pipe flow rate limiting device 1 are enhanced.
The fixing member 11 may be made to be thin and short in size, and is fixed to the inner wall of the pipe by welding or the like after being inserted into the pipe. The fixing member 11 may be formed in a cylindrical shape having the same thickness as the pipe and fixedly connected between the two pipes. When the fixing member 11 is fixed between two adjacent pipes, the above-mentioned "the other end of the supporting member 12 extends into the pipe" means that the other end of the supporting member 12 extends into the axial projection area of the pipe, and does not mean that the other end of the supporting member 12 must extend into the space surrounded by the pipe wall of the pipe.
Referring to fig. 3, the rotation axis a of the flow restricting impeller 13 forms an angle a with the blades 132 of less than 90 degrees. Under normal conditions, the fluid in the conduit produces a force F in its flow direction against the blades 132 that can be resolved into a force F1 parallel to the blades 132 and a force F2 perpendicular to the blades 132. Under the action of the acting force F2, the flow-limiting impeller 13 rotates at a constant rotating speed, and when the flow-limiting impeller 13 rotates, certain turbulence occurs around the flow-limiting impeller, so that the axial fluid is disturbed, and the flow speed of the axial fluid is reduced. In the early stage of processing and manufacturing, the size of the included angle a can be adjusted according to the different rated flow of the pipeline, so that the fluid in the pipeline reaches the rated flow under normal operation after the flow limiting impeller 13 is installed. The smaller the included angle a, the smaller the acting force F2 correspondingly, and the less the pipeline resistance is during rated flow operation.
When the nuclear power plant is in a normal condition, the flow velocity of fluid in the pipeline is smaller, the rotating speed of the impeller 13 is lower, so that the generated pipeline resistance is smaller, and larger flow coincidence can not be caused to the fluid system. When a rupture event occurs to increase the flow rate of the pipe, the force F increases, and the more the flow rate of the pipe increases, the greater the magnitude of the force F increases, and the greater the force component F2 perpendicular to the blades 132. When F2 increases, the higher the rotating speed of the flow-limiting impeller 13, the more obvious the turbulence effect in the fluid, thereby increasing the resistance in the pipeline, reducing the actual flow area of the pipeline and finally achieving the purpose of fluid flow velocity in the pipeline.
Compared with the prior art, the flow automatic regulation device has the advantages that the capacity of flow automatic regulation is enhanced by using a resistance-changing mode, the flow automatic regulation device can be structurally realized by the impeller, a transmission mechanism is not needed, the structure is simple, the reliability is high, and the practicability is high. In addition, the preset relation between the resistance increasing value and the flow velocity increasing value can be obtained by presetting different flow limiting impeller gravity or flow limiting impeller friction coefficients.
It is particularly desirable for a nuclear power plant to limit the flow rate at which a hypothetical rupture of its primary coolant system occurs. Therefore, based on the flow rate limiting device provided by the invention, the nuclear power plant can be correspondingly modified so as to improve the safety of the nuclear power plant.
Specifically, for a certain nuclear power plant, first, a large-diameter high-energy pipeline connected with a loop is comprehensively carded, and the method mainly comprises the following steps: the stabilizer surge tube, the capacitance system (RCS) tube, the waste heat removal system (RRA) tube, the injection system (RIS) tube, and then the flow rate limiting device (such as at the oval ring of fig. 4) is added at the location where these tubes are closest to the main coolant system (i.e., at the nozzle that connects to the main coolant system). The addition of these devices does not affect the proper functioning of the above-mentioned pipes, but if they are broken, the coolant lost from the break will not be excessive due to the addition of the inventive flow rate limiting device upstream of the break.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, but is for the convenience of those skilled in the art to understand and practice the invention, and therefore, equivalent variations to the appended claims are intended to be encompassed by the present invention.
Claims (4)
1. A variable resistance type pipeline flow rate limiting device for limiting the flow rate of fluid in a pipeline, characterized in that: including mounting, support piece and current limiting impeller, the mounting with the pipeline is fixed, the mounting be the shape with the annular structure that the shape of pipeline corresponds, the mounting is fixed in the inner wall of pipeline, the one end of support piece is fixed in the mounting, the other end of support piece extends to in the pipeline, current limiting impeller rotationally install in the other end of support piece, current limiting impeller's axis of rotation is on a parallel with the flow direction of fluid in the pipeline, current limiting impeller's axis of rotation with the central axis coincidence of pipeline, current limiting impeller includes the installation department with be fixed in a plurality of blades of installation department, the blade with current limiting impeller's axis of rotation forms an contained angle.
2. The variable resistance conduit flow rate restriction device according to claim 1, wherein: the fixing piece is fixed between two adjacent pipelines.
3. The variable resistance conduit flow rate restriction device according to claim 1, wherein: the resistance-variable pipeline flow rate limiting device comprises a plurality of supporting pieces, one ends of the supporting pieces are fixed on the fixing pieces at intervals, the other ends of the supporting pieces are connected and fixed together, and the flow-limiting impeller is arranged at one ends of the supporting pieces, which are connected with each other.
4. The variable resistance conduit flow rate restriction device according to claim 1, wherein: the fixing piece and the supporting piece are of an integrated structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710321571.9A CN107180659B (en) | 2017-05-09 | 2017-05-09 | Variable resistance type pipeline flow speed limiting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710321571.9A CN107180659B (en) | 2017-05-09 | 2017-05-09 | Variable resistance type pipeline flow speed limiting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107180659A CN107180659A (en) | 2017-09-19 |
| CN107180659B true CN107180659B (en) | 2023-12-15 |
Family
ID=59832397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710321571.9A Active CN107180659B (en) | 2017-05-09 | 2017-05-09 | Variable resistance type pipeline flow speed limiting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107180659B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112964848B (en) * | 2021-03-08 | 2022-11-29 | 山东东特环境检测技术有限公司 | A sewage discharge check out test set for green |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| UST921015I4 (en) * | 1972-09-13 | 1974-04-16 | Nuclear reactor corii cooling arrangement | |
| US6880195B1 (en) * | 1999-04-17 | 2005-04-19 | P.A.C.T. Engineering (Scotland) Limited | Pipe cleaning device |
| CN201066596Y (en) * | 2007-08-31 | 2008-05-28 | 中国核动力研究设计院 | Down pipe base for nucleus fuel component |
| CN101936441A (en) * | 2010-09-14 | 2011-01-05 | 中国石油大学(北京) | Pipeline operation equipment with automatic speed regulation |
| CN102878385A (en) * | 2011-07-12 | 2013-01-16 | 北京化工大学 | Fluid-driven self-adaption pipeline crawler |
| CN203355645U (en) * | 2013-07-16 | 2013-12-25 | 山东元鸣生物科技有限公司 | Unpowered pipeline mixer for sodium gluconate decoloring |
| CN103953817A (en) * | 2014-04-03 | 2014-07-30 | 上海工程技术大学 | Self-regulation flow speed slowing device |
| CN104976481A (en) * | 2015-05-20 | 2015-10-14 | 上海工程技术大学 | Adjustable self-stabilization flow velocity reducer for pipe |
| CN206961532U (en) * | 2017-05-09 | 2018-02-02 | 中广核研究院有限公司 | Become resistance type pipe flow speed limits device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT413743B (en) * | 2001-11-08 | 2006-05-15 | Tcg Unitech Ag | RADIAL PUMP |
| US7055657B2 (en) * | 2004-01-20 | 2006-06-06 | George Reisch Aschauer | Wet friction device with inward and outward circulating cooling means |
-
2017
- 2017-05-09 CN CN201710321571.9A patent/CN107180659B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| UST921015I4 (en) * | 1972-09-13 | 1974-04-16 | Nuclear reactor corii cooling arrangement | |
| US6880195B1 (en) * | 1999-04-17 | 2005-04-19 | P.A.C.T. Engineering (Scotland) Limited | Pipe cleaning device |
| CN201066596Y (en) * | 2007-08-31 | 2008-05-28 | 中国核动力研究设计院 | Down pipe base for nucleus fuel component |
| CN101936441A (en) * | 2010-09-14 | 2011-01-05 | 中国石油大学(北京) | Pipeline operation equipment with automatic speed regulation |
| CN102878385A (en) * | 2011-07-12 | 2013-01-16 | 北京化工大学 | Fluid-driven self-adaption pipeline crawler |
| CN203355645U (en) * | 2013-07-16 | 2013-12-25 | 山东元鸣生物科技有限公司 | Unpowered pipeline mixer for sodium gluconate decoloring |
| CN103953817A (en) * | 2014-04-03 | 2014-07-30 | 上海工程技术大学 | Self-regulation flow speed slowing device |
| CN104976481A (en) * | 2015-05-20 | 2015-10-14 | 上海工程技术大学 | Adjustable self-stabilization flow velocity reducer for pipe |
| CN206961532U (en) * | 2017-05-09 | 2018-02-02 | 中广核研究院有限公司 | Become resistance type pipe flow speed limits device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107180659A (en) | 2017-09-19 |
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