CN114720087A - Real current testing device and method for high-voltage throttling device for nuclear power - Google Patents
Real current testing device and method for high-voltage throttling device for nuclear power Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a real current testing device and a real current testing method of a high-voltage throttling device for nuclear power, which comprises the following steps: one end of the water inlet pipeline is connected with the water tank, and the other end of the water inlet pipeline is connected with an inlet of the high-pressure pump; the water source is used for simultaneously providing water for the test loop and the pressure regulating loop; the test loop is connected with an outlet pipeline of the high-pressure pump and used for testing the pressure drop and the flow of the inlet section and the outlet section of the tested piece; and the pressure regulating loop shares the outlet pipeline of the high-pressure pump with the test loop and is used for regulating the pressure of the test loop and the pressure regulating loop by regulating the flow flowing into the pressure regulating loop. The pressure regulating circuit with the electric regulating valve is added, and the pressure of the test circuit and the pressure regulating circuit can be basically stable through fine adjustment of the electric regulating valve; the difficulty of simultaneously adjusting the flow and the pressure by a single pass test loop is reduced.
Description
Technical Field
The invention relates to the technical field of flow limiting and plug flow principle flow control, in particular to a real-current testing device and a testing method of a high-voltage throttling device for nuclear power.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The passive safety system pressurized water reactor nuclear power technology is a new three-generation + nuclear power technology, such as AP1000 and CAP1400, and has wide development prospect due to the safety and the advancement. Chemical and volume control systems (CVS) in the pressurized water reactor nuclear power technology of passive safety systems require maintenance of the coolant required by the Reactor Coolant System (RCS) to maintain the level of the pressurizer during operation of the nuclear power plant. In order to ensure the stability of the water supply flow and pressure of the CVS and prevent the overflow of the system, a flow control device which has high flow control precision, sensitive response, compact structure and long service life and utilizes the flow limiting plug flow principle of a Venturi tube needs to be developed.
With reference to fig. 1, the flow-limiting venturi tube body is composed of an inlet straight tube section, a reducing section, a cylindrical throat section, a conical gradually expanding section, an outlet straight tube section and the like, and the size of the throat section of the venturi tube is small, so that cavitation plug flow is generated on the venturi tube, and the stability of water supplement amount of a CVS system is kept. Empirical determinations are typically made using empirical formulas. Under the condition of high-pressure environment turbulent flow, the flow speed of a pipeline is high, the reliability of cavitation plug flow generated under expected working conditions is greatly reduced through the calculated throat diameter of the Venturi tube, the cavitation plug flow is usually verified through a real-flow test, the flow and the front-back pressure difference of the Venturi tube are measured under the specified inlet pressure, and finally the throat diameter and the curve surface of the internal flow passage of the Venturi tube are determined through repeated iterative improvement.
The mutual influence of the inlet pressure, the flow and the pressure difference of the tested piece particularly makes the judgment of the occurrence point of the cavitation erosion difficult, particularly, the pressure drop of the tested piece, which is confirmed under the cavitation plug flow occurrence condition that the flow is not increased any more, is extremely easy to be larger, and the unqualified tested piece is easy to cause due to the measurement verification method.
Disclosure of Invention
In order to solve the problems, the invention provides a real-time testing device and a testing method for a high-pressure throttling device for nuclear power, which can accurately verify the accurate pressure drop and flow of cavitation points under the specified pressure working condition.
In some embodiments, the following technical scheme is adopted:
a high-voltage throttling device real current testing device for nuclear power comprises:
one end of the water inlet pipeline is connected with the water tank, and the other end of the water inlet pipeline is connected with an inlet of the high-pressure pump; the water source is used for simultaneously providing water for the test loop and the pressure regulating loop;
the test loop is connected with an outlet pipeline of the high-pressure pump and used for testing the pressure, the pressure drop and the flow of the inlet section and the outlet section of the tested piece;
and the pressure regulating loop shares the outlet pipeline of the high-pressure pump with the test loop and is used for regulating the pressure of the test loop and the pressure regulating loop by regulating the flow flowing into the pressure regulating loop.
As an optional implementation, the method further comprises: and one end of the small-flow bypass loop, the pressure regulating loop and the test loop share a high-pressure pump outlet pipeline, and the other end of the small-flow bypass loop is connected to the water tank.
As an alternative embodiment, the small-flow bypass circuit is provided with a stop valve and a pressure reduction orifice plate in sequence from the outlet end of the high-pressure pump; when the high-pressure pump is started and closed and the pressure of the test loop and the pressure regulating loop is out of control, the test device is subjected to safety protection by opening the stop valve.
As an alternative embodiment, the test loop comprises: the device comprises a tested piece, pressure transmitters respectively arranged at the inlet and the outlet of the tested piece, an ultrasonic flowmeter arranged at the inlet or the outlet of the tested piece, a thermometer arranged at the inlet of the tested piece, a second regulating valve and a multi-stage orifice plate.
As an optional embodiment, a first regulating valve and a pressure drop orifice plate are arranged on the pressure regulating circuit.
As an optional implementation manner, a filter is arranged at one end of the water inlet pipeline close to the high-pressure pump, and a gate valve and an electromagnetic flowmeter are further arranged on the water inlet pipeline.
As an alternative, the ends of both the test circuit and the pressure regulating circuit are connected to a water tank.
As an optional implementation manner, a first pressure transmitter, a second pressure transmitter and a third pressure transmitter are respectively arranged on the test loop; the second pressure transmitter and the third pressure transmitter are respectively arranged at the inlet and the outlet of the tested piece, the first pressure transmitter is arranged at the linear pipe section of the test loop, and the distance between the first pressure transmitter and the second pressure transmitter is equal to the sum of the distance between the second pressure transmitter and the inlet of the tested piece and the distance between the third pressure transmitter and the outlet of the tested piece.
In other embodiments, the following technical solutions are adopted:
an actual current testing method of a high-voltage throttling device for nuclear power comprises the following steps:
controlling a water source to flow into a test loop and a pressure regulating loop at a set small flow, and checking the tightness of the connection between a tested piece and other elements on the test loop;
controlling the flow of the test loop and the pressure regulating loop to enable the test loop and the pressure regulating loop to operate for a set time in a pressure stable state;
adjusting the test loop to reach the set target pressure, and controlling the flow of the test loop to be close to the set target flow; the opening of the flow regulating valve is gradually increased through fine adjustment until the flow is not increased when the opening of the flow regulating valve is increased, a cavitation state is achieved, and flow data and pressure drop at two ends of a tested piece at the moment are recorded.
As an optional implementation, further comprising: and respectively measuring and recording the pressure, flow, temperature, valve opening and pressure drop data of the tested piece under different target pressures.
Compared with the prior art, the invention has the beneficial effects that:
(1) the pressure regulating circuit with the electric regulating valve is added, and the pressure of the test circuit and the pressure regulating circuit can be basically stable through fine adjustment of the electric regulating valve; the difficulty of simultaneously adjusting the flow and the pressure by a single pass test loop is reduced.
(2) The test loop and the pressure regulating loop are respectively provided with the electric regulating valves, and the two electric regulating valves can be respectively set and interlocked according to the target determined pressure and flow, so that different pressure and flow working conditions required by a tested piece can be more easily determined.
(3) The method for measuring the cavitation plug flow point can more accurately obtain the cavitation plug flow pressure drop of the tested piece according to the change relation between the opening of the valve and the pressure drop of the tested piece when the flow and the pressure of the tested piece are stable by adjusting the opening of the electric regulating valve after the pressure, the temperature and the flow of the inlet section of the tested piece are determined.
Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic view of a flow-restricting venturi configuration;
FIG. 2 is a schematic structural diagram of an actual flow testing device of a nuclear power high-pressure throttling device in the embodiment of the invention;
the system comprises a small-flow bypass loop 1, a pressure regulating loop 2, a test loop 3, a water inlet pipeline 4, a high-pressure pump 5, a water tank 6, a gate valve 7, a filter 8, an electromagnetic flowmeter 9, a stop valve 10, a pressure reducing pore plate 11, a tested piece 12, a second pressure transmitter 13, a third pressure transmitter 14, an ultrasonic flowmeter 15, a thermometer 16, a second regulating valve 17, a first regulating valve 18, a pressure reducing pore plate 19, a first pressure transmitter 20 and a multi-stage pore plate 21.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
In one or more embodiments, an actual current testing device for a high-voltage throttling device for nuclear power is disclosed, and with reference to fig. 2, the actual current testing device specifically includes:
one end of the water inlet pipeline 4 is connected with the water tank 6, and the other end of the water inlet pipeline 4 is connected with an inlet of the high-pressure pump 5; for simultaneously providing a water source for the test circuit and the pressure regulating circuit 2;
the test loop is connected with an outlet pipeline of the high-pressure pump 5 and used for testing the pressure, the pressure drop and the flow of the inlet section and the outlet section of the tested piece 12;
and the pressure regulating loop 2 shares an outlet pipeline of the high-pressure pump 5 with the test loop and is used for regulating the pressure of the test loop and the pressure regulating loop 2 by regulating the flow rate flowing into the pressure regulating loop 2.
One end of the small-flow bypass circuit 1, the pressure regulating circuit 2 and the test circuit share an outlet pipeline of the high-pressure pump 5, and the other end of the small-flow bypass circuit 1 is connected to a water tank 6.
In this embodiment, with reference to fig. 2, the water tank 6 provides the required water source for the test loop and the pressure regulating loop 2; the water inlet pipeline 4 is sequentially connected with a gate valve 7, an electromagnetic flowmeter 9 and a filter 8 from one end connected with the water tank 6; impurities in water in the water tank 6 and the water inlet pipeline 4 can be filtered through the filter 8, and the flow state and the blocking condition of the inlet of the high-pressure pump 5 can be detected through the electromagnetic flow meter 9; in addition, the electromagnetic flowmeter 9 is a high-precision (0.5-level) electromagnetic flowmeter 9, and when the small-flow bypass and the pressure regulating loop 2 are closed, the ultrasonic flowmeter (1.5-level) of the test pipeline can be calibrated and compared, so that the test data is more accurate and reliable.
In this embodiment, the pressure regulating circuit 2 is sequentially connected with the first regulating valve 18 and the pressure drop orifice plate 19 from one end connected with the high-pressure pump 5, and the pressure of the test circuit and the pressure regulating circuit 2 can be regulated by regulating the opening and the flow of the first regulating valve 18, so that the pressure of the test circuit and the pressure regulating circuit 2 is kept stable; the pressure drop pore plate 19 can reduce the pressure of an outlet pipeline, reduce water pressure impact and protect a system; the end of the pressure regulating circuit 2 is connected to a water tank 6.
In the embodiment, the test loop is sequentially connected with a thermometer 16, an ultrasonic flowmeter 15, a first pressure transmitter 20, a tested piece 12, a second pressure transmitter 13, a second regulating valve 17 and a multi-stage orifice plate 21 from one end connected with the high-pressure pump 5; the end of the test loop is connected to the water tank 6; the test piece 12 is a flow-limiting venturi tube.
In the test loop of the embodiment, a first pressure transmitter 20 and a second pressure transmitter 13 are respectively arranged at the inlet and the outlet of a tested piece 12, an ultrasonic flowmeter 15 is arranged at the inlet or the outlet of the tested piece 12, and a jacquard thermometer 16 which can be displayed on site and at a remote end is also arranged at the inlet of the tested piece 12; a second regulating valve 17 is arranged on the test loop and used for regulating the flow and the pressure of the test loop; the test loop can display and calculate the flow, the temperature, the pressure drop and the valve opening of the tested piece 12 in real time, and automatically generate parameters such as the pressure drop, the flow and the like of the tested piece 12 under various working conditions, so that the operation is more convenient.
In this embodiment, the first regulating valve 18 and the second regulating valve 17 are both electric regulating valves, which can perform remote automatic control, and the first regulating valve 18 of the pressure regulating circuit 2 can automatically regulate the stability of the pressure regulating circuit 2 under the set pressure, and the test circuit is also stable under the set pressure because the test circuit is communicated with the pressure regulating circuit 2; the flow of the test loop can be automatically adjusted through the second regulating valve 17 of the test loop; when the flow of the test loop is fine-tuned in a stable pressure state, the pressures of the two loops will change to a certain extent, and at this time, the first regulating valve 18 will automatically adjust according to the pressure change, so that the pressure is maintained stable; therefore, the interlocking of the two electric regulating valves is realized, and different pressure and flow working conditions required by the tested piece 12 are more easily determined.
A first pressure transmitter 20PT1, a second pressure transmitter 13PT2 and a third pressure transmitter 14PT3 are respectively arranged on the test loop 3; the second pressure transmitter 13PT2 and the third pressure transmitter 14PT3 are respectively arranged at the inlet and the outlet of the tested piece 12, the first pressure transmitter 20 is arranged at the straight pipe section of the test loop, and the distance between the first pressure transmitter 20 and the second pressure transmitter 13 is equal to the sum of the distance between the second pressure transmitter 13 and the inlet of the tested piece 12 and the distance between the third pressure transmitter 14 and the outlet of the tested piece 12.
First pressure transmitter 20PT1, second pressure transmitter 13PT2 and third pressure transmitter 14PT3 can independently display the pressure value of each test point; by measuring the differential pressure between PT3 and PT2, subtracting the differential pressure between PT2 and PT1, which is equivalent to subtracting the line pressure between the second pressure transmitter 13PT2 and the inlet of the piece 12 to be tested, and the line pressure between the third pressure transmitter 14PT3 and the outlet of the piece 12 to be tested, it is possible to obtain an accurate pressure drop across the piece 12 to be tested.
In the embodiment, the small-flow bypass loop 1 is provided with a stop valve 10 and a pressure reduction pore plate 11 in sequence from the outlet end of the high-pressure pump 5; the shut-off valve 10 can be opened to safeguard the test device when the high-pressure pump 5 is switched on or off and after the electric valves of the test circuit and the pressure regulating circuit 2 have failed.
The testing device of the embodiment has the advantages of accurate testing, high automation degree, wide application range and wide scene, and can be suitable for working environments with complex working conditions and high requirements on pressure and precision measurement.
Example two
In one or more embodiments, a real-time testing method for a high-voltage throttling device for nuclear power is disclosed, which specifically comprises the following steps:
the gate valve 7 of the water inlet line 4 is first opened. The opening degrees of the first and second regulating valves 18 and 17 are confirmed, and the low flow rate state is maintained. And detecting the states of the pressure transmitter and the flowmeter of the test pipeline and the sealing condition of the connecting piece.
And then starting the high-pressure pump 5, adjusting the opening of the pressure loop, and maintaining the stable circulation of the system for 5-10 minutes.
Testing the tested piece 12 under the normal working condition:
selecting a test working condition table, determining the target pressure of the inlet section of the tested piece 12, and performing automatic setting operation of a test system; after the test working condition is stable, the system automatically records the data of the flow, the pressure, the temperature, the opening degree of the regulating valve, the pressure drop and the like of the tested piece 12 under different target pressures at intervals of 5-10 seconds, and automatically calculates the data of the basic error, the repeatability and the like of the tested piece 12.
Secondly, testing the tested piece 12 under the working condition of cavitation and flow blockage:
when the test working condition reaches the specified pressure, controlling the flow to be close to the target flow; by fine-tuning the second regulating valve 17, the opening of the flow regulating valve is automatically adjusted step by step (for example, 1% opening is adjusted each time), when the flow is not increased under the condition of stipulating pressure again, the cavitation state is reached, the flow data and the pressure drop at two ends of the tested piece 12 are recorded, and the test result can be more accurate.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The utility model provides a high-pressure throttling arrangement real current testing arrangement for nuclear power which characterized in that includes:
one end of the water inlet pipeline is connected with the water tank, and the other end of the water inlet pipeline is connected with an inlet of the high-pressure pump; the water source is used for simultaneously providing water for the test loop and the pressure regulating loop;
the test loop is connected with an outlet pipeline of the high-pressure pump and used for testing the pressure, the pressure drop and the flow of the inlet section and the outlet section of the tested piece;
and the pressure regulating loop and the test loop share the high-pressure pump outlet pipeline and are used for regulating the pressure of the test loop and the pressure regulating loop by regulating the flow flowing into the pressure regulating loop.
2. The actual current testing device of the nuclear power high-voltage throttling device of claim 1, further comprising: and one end of the small-flow bypass loop, the pressure regulating loop and the test loop share a high-pressure pump outlet pipeline, and the other end of the small-flow bypass loop is connected to the water tank.
3. The practical flow testing device of the nuclear power high-pressure throttling device according to claim 2, wherein the small-flow bypass circuit is provided with a stop valve and a pressure reduction orifice plate in sequence from the outlet end of the high-pressure pump; when the high-pressure pump is started and closed and the pressure of the test loop and the pressure regulating loop is out of control, the testing device is subjected to safety protection by opening the stop valve.
4. The device for testing the actual current of the nuclear power high-voltage throttling device according to claim 1, wherein the test loop comprises: the device comprises a tested piece, pressure transmitters respectively arranged at the inlet and the outlet of the tested piece, an ultrasonic flowmeter arranged at the inlet or the outlet of the tested piece, a thermometer arranged at the inlet of the tested piece, a second regulating valve and a multi-stage orifice plate.
5. The practical flow testing device of the nuclear power high-pressure throttling device as claimed in claim 1, wherein a first regulating valve and a pressure drop orifice plate are arranged on the pressure regulating loop.
6. The practical flow testing device of the nuclear power high-pressure throttling device according to claim 1, wherein a filter is arranged at one end of the water inlet pipeline close to the high-pressure pump, and a gate valve and an electromagnetic flow meter are further arranged on the water inlet pipeline.
7. The high-pressure throttling device actual flow testing device for nuclear power as claimed in claim 1, wherein the tail ends of the test loop and the pressure regulating loop are connected to a water tank.
8. The practical flow testing device of the nuclear power high-pressure throttling device of claim 1, wherein a first pressure transmitter, a second pressure transmitter and a third pressure transmitter are respectively arranged on the test loop; the second pressure transmitter and the third pressure transmitter are respectively arranged at the inlet and the outlet of the tested piece, the first pressure transmitter is arranged at the linear pipe section of the test loop, and the distance between the first pressure transmitter and the second pressure transmitter is equal to the sum of the distance between the second pressure transmitter and the inlet of the tested piece and the distance between the third pressure transmitter and the outlet of the tested piece.
9. An actual current testing method of a high-voltage throttling device for nuclear power is characterized by comprising the following steps:
controlling a water source to flow into a test loop and a pressure regulating loop at a set small flow, and checking the tightness of the connection between a tested piece and other elements on the test loop;
controlling the flow of the test loop and the pressure regulating loop to enable the test loop and the pressure regulating loop to operate for a set time in a pressure stable state;
adjusting the test loop to reach the set target pressure, and controlling the flow of the test loop to be close to the set target flow; the opening degree of the flow regulating valve is gradually increased through fine adjustment until the flow is not increased when the opening degree of the flow regulating valve is increased, a cavitation state is achieved, and flow data and pressure drop at two ends of a tested piece at the moment are recorded.
10. The method for testing the actual current of the nuclear power high-voltage throttling device according to claim 9, further comprising the following steps: and respectively measuring and recording the pressure, flow, temperature, valve opening and pressure drop data of the tested piece under different target pressures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210282636.4A CN114720087A (en) | 2022-03-22 | 2022-03-22 | Real current testing device and method for high-voltage throttling device for nuclear power |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210282636.4A CN114720087A (en) | 2022-03-22 | 2022-03-22 | Real current testing device and method for high-voltage throttling device for nuclear power |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207703448U (en) * | 2018-01-18 | 2018-08-07 | 西南石油大学 | A kind of device of evaluation Venturi tube cavitation performance |
| CN208049726U (en) * | 2018-02-05 | 2018-11-06 | 西安交通大学 | A kind of mixing wastewater with air experimental provision using venturi injection return water |
| CN110115941A (en) * | 2018-02-05 | 2019-08-13 | 西安交通大学 | It is a kind of that hydrodynamic mixing wastewater with air experimental provision is increased back using venturi |
| CN211401967U (en) * | 2019-12-05 | 2020-09-01 | 深圳市万斯得自动化设备有限公司 | Pressure drop test system |
| CN111998900A (en) * | 2020-09-04 | 2020-11-27 | 上海核工程研究设计院有限公司 | Nuclear power plant current limiting venturi test bed and test method |
-
2022
- 2022-03-22 CN CN202210282636.4A patent/CN114720087A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207703448U (en) * | 2018-01-18 | 2018-08-07 | 西南石油大学 | A kind of device of evaluation Venturi tube cavitation performance |
| CN208049726U (en) * | 2018-02-05 | 2018-11-06 | 西安交通大学 | A kind of mixing wastewater with air experimental provision using venturi injection return water |
| CN110115941A (en) * | 2018-02-05 | 2019-08-13 | 西安交通大学 | It is a kind of that hydrodynamic mixing wastewater with air experimental provision is increased back using venturi |
| CN211401967U (en) * | 2019-12-05 | 2020-09-01 | 深圳市万斯得自动化设备有限公司 | Pressure drop test system |
| CN111998900A (en) * | 2020-09-04 | 2020-11-27 | 上海核工程研究设计院有限公司 | Nuclear power plant current limiting venturi test bed and test method |
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