CN217688191U

CN217688191U - Pressure control device for hydrostatic test of nuclear power station container/heat exchanger

Info

Publication number: CN217688191U
Application number: CN202220958048.3U
Authority: CN
Inventors: 张振国; 丰慧星; 赵伟华; 江奎融; 张鼎超; 司子一; 李茂超
Original assignee: China General Nuclear Power Corp; CGN Power Co Ltd; Suzhou Nuclear Power Research Institute Co Ltd
Current assignee: China General Nuclear Power Corp; CGN Power Co Ltd; Suzhou Nuclear Power Research Institute Co Ltd
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2022-10-28
Anticipated expiration: 2032-04-24

Abstract

The utility model relates to a nuclear power station container heat exchanger hydrostatic test pressure control device, including the inside pressure buffer container that can fill water, the trunk line, the pressurization subassembly, fill water subassembly, pressure measurement subassembly and valve module, trunk line one end and pressure buffer container intercommunication, the other end is used for being connected with waiting test equipment, the pressurization subassembly includes first small transfer line, the test pump, first small transfer line one end and trunk line intercommunication, the other end and test pump intercommunication, it includes the second small transfer line to fill water subassembly, the water source, second small transfer line one end and trunk line intercommunication, the other end and water source intercommunication, pressure measurement subassembly sets up on the trunk line, the valve module sets up at the trunk line, on first small transfer line and the second small transfer line. The utility model discloses satisfied the nuclear island pressure vessel that the volume is little and test pressure is high, heat exchanger's hydrostatic test requirement, increased the volume in test loop, the lift pressure rate in the effective control test process prevents that nuclear island pressure vessel, heat exchanger from producing the damage, and the security is high.

Description

Pressure control device for hydrostatic test of nuclear power station container/heat exchanger

Technical Field

The utility model belongs to the technical field of nuclear power hydrostatic test, concretely relates to nuclear power station container heat exchanger hydrostatic test pressure control device.

Background

According to the standard requirements of 'inspection rules of nuclear island mechanical parts in service' of pressurized water reactor nuclear power plants, the national legal pressurized water reactor nuclear power plants need to perform one legal hydraulic test on equipment such as nuclear island pressure containers with the standard grades of 2 and 3, heat exchangers and the like within a ten-year period so as to verify the strength and the sealing performance of the equipment. For design reasons, the volume of part of the nuclear island pressure vessel and the heat exchanger is small (for example, less than 0.01 cubic meter), but according to the specification requirements, the test pressure of the nuclear island pressure vessel and the heat exchanger needs to be 1.2 times of the design pressure, namely the test pressure can reach more than 20MPa, and in order to avoid that the mechanical stress borne by the pressure-bearing parts of the nuclear island pressure vessel and the heat exchanger is too large due to too fast speed during pressure rising and pressure reducing, the pressure rising and reducing speed is generally specified not to exceed 1MPa/min at present. However, since the compressibility of water is not strong, when the nuclear island pressure vessel and the heat exchanger having a small volume and a high test pressure are encountered, it is difficult to control the step-up/step-down rate during the test, and the step-up/step-down rate exceeds the test step-up/step-down rate required by the specification, thereby damaging the nuclear island pressure vessel and the heat exchanger.

Therefore, the common hydraulic test device for the nuclear island pressure vessel and the heat exchanger in the domestic in-service nuclear power plant at present has the following technical problems:

1. the conventional hydrostatic test device is designed for the conventional nuclear island pressure vessel and heat exchanger, and does not consider the test requirements of the nuclear island pressure vessel and the heat exchanger with small volume and high test pressure (namely, the volume is less than 0.01 cubic meter, and the test pressure is higher than 20 MPa);

2. valves in a common hydraulic test device are mostly valves with low control precision such as ball valves and stop valves, and the pressure increasing and reducing rate in a test loop is basically controlled by a single valve, so that the overall control precision is low;

3. the common hydraulic pressure test device cannot effectively control the test pressure increasing and reducing speed requirement in the test process, so that the test pressure increasing and reducing speed exceeds the test pressure increasing and reducing speed required by the specification, and the nuclear island pressure vessel and the heat exchanger are easily damaged.

Disclosure of Invention

The utility model aims at providing a nuclear power station container heat exchanger hydrostatic test pressure control device for solve the current device and go up and down to press speed control difficulty scheduling problem.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

a nuclear power plant vessel/heat exchanger hydrostatic test pressure control apparatus comprising:

a pressure buffer container: the pressure buffer container can be filled with water;

main pipe line: one end of the main pipeline is communicated with the pressure buffer container, and the other end of the main pipeline is used for being connected with equipment to be tested;

a pressurizing assembly: the pressurizing assembly comprises a first branch pipeline and a test pump, wherein one end of the first branch pipeline is communicated with the main pipeline, and the other end of the first branch pipeline is communicated with the test pump;

a water filling assembly: the water filling assembly comprises a second branch pipeline and a water source, one end of the second branch pipeline is communicated with the main pipeline, and the other end of the second branch pipeline is communicated with the water source;

a pressure measuring assembly: the pressure measuring assembly is arranged on the main pipeline;

a valve assembly: the valve assembly is arranged on the main pipeline, the first branch pipeline and the second branch pipeline.

Preferably, the valve module include first control valve, second control valve, third control valve and fourth control valve, first control valve set up be located first lateral conduit with wait the trunk line between the test equipment on, the second control valve set up be located first lateral conduit with the trunk line between the pressure buffer vessel on, the third control valve set up first lateral conduit on, the fourth control valve set up the second lateral conduit on. Through setting up the valve module increased multichannel pressure control barrier, effectively increased experimental control means of going up and down to press the speed.

Further preferably, the first control valve, the second control valve, the third control valve and the fourth control valve can bear pressure greater than or equal to 30MPa; the first control valve, the second control valve, the third control valve and the fourth control valve are needle valves.

Preferably, the pressure measuring assembly comprises a first pressure gauge and a second pressure gauge, the first pressure gauge is arranged on a main pipe between the first branch pipe and the equipment to be tested, and the second pressure gauge is arranged on a main pipe between the first branch pipe and the pressure buffer container.

Further preferably, the measuring ranges of the first pressure gauge and the second pressure gauge are 1.5-3 times of the test pressure of the device to be tested, and the precision grades of the first pressure gauge and the second pressure gauge are more than or equal to 0.4 grade.

Preferably, one end of the second branch pipeline is communicated with the main pipeline between the first branch pipeline and the pressure buffer container.

Further preferably, the second control valve is arranged on the main pipeline between the first branch pipeline and the second branch pipeline; the second pressure gauge is arranged on the main pipeline between the first branch pipeline and the second branch pipeline.

Preferably, the test device further comprises a rubber hose, and the other end of the main pipeline is connected with the equipment to be tested through the rubber hose; the rubber tube can bear the pressure of more than or equal to 30MPa.

Preferably, the testing device further comprises a safety valve assembly, wherein the safety valve assembly comprises a third branch pipeline and a safety valve arranged on the third branch pipeline, and the third branch pipeline is communicated with the main pipeline between the first branch pipeline and the equipment to be tested. The safety valve component can avoid overpressure risks in the test process and prevent equipment to be tested from being damaged due to overpressure.

Further preferably, the setting pressure of the safety valve is 1.1 times of the test pressure of the equipment to be tested.

Preferably, the pressure buffer container comprises a container body and a vent piece arranged on the container body; the container body can bear the pressure of more than or equal to 30MPa.

Preferably, the rated pressure of the test pump is more than or equal to 30MPa; the test pump adopts a hand-press test pump.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

the utility model discloses a set up pressure buffer container and valve module, satisfied the less and higher nuclear island pressure vessel of testing pressure of volume, heat exchanger's hydrostatic test requirement, increased the volume in experimental return circuit, and can the effective control in the testing process step up and down to press speed, and greatly improved the control accuracy who presses speed up and down, can prevent that nuclear island pressure vessel, heat exchanger from producing the damage, and simple structure, convenient to use, the security is high.

Drawings

Fig. 1 is a schematic view of the overall structure of the hydraulic test pressure control apparatus of this embodiment.

In the above drawings: 1. a pressure buffer vessel; 11. a container body; 12. an exhaust member; 2. a pressurizing assembly; 21. a first branch conduit; 22. a test pump; 3. a water filling assembly; 31. a second branch duct; 32. a water source; 4. a pressure measuring assembly; 41. a first pressure gauge; 42. a second pressure gauge; 5. a valve assembly; 51. a first control valve; 52. a second control valve; 53. a third control valve; 54. a fourth control valve; 6. a main pipeline; 7. a hose; 8. a relief valve assembly; 81. a third branch conduit; 82. a safety valve; 9. the equipment to be tested.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A nuclear power station container/heat exchanger hydrostatic test pressure control device is shown in figure 1, and can be connected with equipment to be tested 9 to perform hydrostatic test, wherein the equipment to be tested 9 comprises a nuclear island pressure container, a heat exchanger and the like. The hydraulic test pressure control device specifically comprises a pressure buffer container 1, a pressurizing assembly 2, a water filling assembly 3, a pressure measuring assembly 4 and a valve assembly 5, wherein the pressure buffer container 1 is communicated with a device to be tested 9 through a main pipeline 6, the pressurizing assembly 2 and the water filling assembly 3 are both connected to the main pipeline 6, and the pressure measuring assembly 4 and the valve assembly 5 are respectively used for measuring pressure and controlling pressure rise and pressure drop.

The pressure buffer container 1 specifically comprises a container main body 11 and an exhaust member 12, wherein the container main body 11 can be filled with water, the container main body 11 can bear the pressure of more than or equal to 30MPa, the volume of the container main body is 0.1 cubic meter, and the exhaust member 12 is arranged on the container main body 11. The container body 11 communicates with one end of the main pipe 6, and the other end of the main pipe 6 is used for being connected with the device to be tested 9, specifically: the other end of the main pipeline 6 is connected with a rubber hose 7, and the other end of the main pipeline 6 is connected with a device to be tested 9 through the rubber hose 7; the rubber tube 7 adopts a high-pressure rubber tube, namely the rubber tube 7 can bear the pressure of more than or equal to 30MPa.

The pressurizing assembly 2 specifically comprises a first branch pipeline 21 and a test pump 22, one end of the first branch pipeline 21 is communicated with the main pipeline 6, the other end of the first branch pipeline 21 is communicated with the test pump 22, and the rated pressure of the test pump 22 is greater than or equal to 30MPa. In this embodiment: the test pump 22 is a hand-press test pump, and is convenient to operate.

The water filling assembly 3 specifically comprises a second branch pipe 31 and a water source 32, wherein one end of the second branch pipe 31 is communicated with the main pipe 6, and the other end of the second branch pipe 31 is communicated with the water source 32. In this embodiment: one end of the second branch pipe 31 is connected to the main pipe 6 between the first branch pipe 21 and the pressure buffer vessel 1.

The load cell assembly 4 is arranged on the main pipeline 6 and used for measuring pressure in the test process. The pressure measuring component 4 specifically comprises a first pressure gauge 41 and a second pressure gauge 42, the first pressure gauge 41 is arranged on the main pipe 6 between the first branch pipe 21 and the device to be tested 9, and the second pressure gauge 42 is arranged on the main pipe 6 between the first branch pipe 21 and the pressure buffer container 1. In order to improve the test precision, the measuring range of the first pressure gauge 41 and the second pressure gauge 42 should be 1.5 times to 3 times of the test pressure of the device to be tested 9, and the precision grade of the first pressure gauge 41 and the second pressure gauge 42 should be greater than or equal to 0.4. In this embodiment: the second pressure gauge 42 is particularly arranged on the main pipe 6 between the first branch pipe 21 and the second branch pipe 22.

Valve assemblies 5 may be used to regulate the buck-boost rate during the test, the valve assemblies 5 being disposed on the main conduit 6, the first branch conduit 21, and the second branch conduit 31. Specifically, the method comprises the following steps: the valve assembly 5 comprises a first control valve 51, a second control valve 52, a third control valve 53 and a fourth control valve 54, the first control valve 51 is arranged on the main pipe 6 between the first branch pipe 21 and the device to be tested 9, the second control valve 52 is arranged on the main pipe 6 between the first branch pipe 21 and the pressure buffer container 1, the third control valve 53 is arranged on the first branch pipe 21, and the fourth control valve 54 is arranged on the second branch pipe 31; the first control valve 51, the second control valve 52, the third control valve 53 and the fourth control valve 54 should all be able to withstand pressures of 30MPa or more. In this embodiment: the second control valve 52 is particularly arranged on the main pipe 6 between the first branch pipe 21 and the second branch pipe 31; the first control valve 51, the second control valve 52, the third control valve 53, and the fourth control valve 54 are needle valves. The first control valve 51, the second control valve 52, the third control valve 53 and the fourth control valve 54 are arranged, so that a plurality of pressure control barriers are increased, and a control means for testing the pressure increasing and reducing rate is effectively increased.

In addition, in order to avoid the overpressure risk generated in the test process and prevent the equipment to be tested 9 from being damaged due to overpressure, the test device is also provided with a safety valve assembly 8. The safety valve assembly 8 specifically comprises a third branch pipeline 81 and a safety valve 82, wherein the third branch pipeline 81 is communicated with the main pipeline 6 between the first branch pipeline 21 and the device to be tested 9, namely the third branch pipeline 81 is connected to the main pipeline 6 close to the rubber hose 7; a safety valve 82 is provided on the third branch pipe 81, and the setting pressure of the safety valve 82 should be 1.1 times the test pressure of the device to be tested 9.

The test method using the hydrostatic test pressure control apparatus of the present embodiment is specifically described below:

s1: preparatory work was performed prior to the experiment, including but not limited to the following:

(1) Preparing equipment to be tested 9 and relevant tools, and checking and confirming that the states of all parts of the hydrostatic testing device are qualified;

(2) Taking foreign matter prevention measures for the field opening equipment; confirming that the scaffold required by the test is correctly built;

(3) Confirming the environment of a test site, setting a test boundary, pulling a warning tape and setting a warning mark; carrying out test boundary inspection to prevent non-test workers from mistakenly running the test boundary and forbidding all non-test related activities; verifying that the experimental boundary has been correctly isolated and gas displaced; operators at all locations can communicate effectively by verification.

(4) Confirming that a heat preservation piece needing to be removed from the detection part on the device to be tested 9 is removed; dismantling other system components connected with the equipment to be tested 9 at the position where the hydrostatic test device needs to be installed; visual inspection is carried out on the inside and the outside of the device to be tested 9, and the inspection result is confirmed to be qualified.

(5) The components of the hydraulic pressure test device are connected, assembled and sealed, and are connected with the equipment 9 to be tested, wherein the connection mode can adopt a mode of screw connection and the like, and the sealing mode can adopt a mode of winding magic ropes or adding gaskets and the like.

S2: after the preparation work is finished, carrying out a hydrostatic test, and specifically comprising the following steps:

(1) Carrying out a water filling operation, in particular: opening the exhaust device of the equipment to be tested 9 and the exhaust part 12 of the pressure buffer container 1, keeping the third control valve 53 closed, starting the water source 32, and opening the first control valve 51, the second control valve 52 and the fourth control valve 54, so that the equipment to be tested 9 and the pressure buffer container 1 are filled with test water through the water source 32; subsequently, the water supply 32 is closed, the exhaust of the device under test 9 and the exhaust 12 of the pressure buffer vessel 1 are closed, and the first control valve 51, the second control valve 52 and the fourth control valve 54 are closed.

(2) Performing a boost operation, specifically: setting the valve opening degrees of the first control valve 51 and the third control valve 53 to be larger and the valve opening degree of the second control valve 52 to be smaller, and checking whether the outer surface of the device to be tested 9 is dry; starting the test pump 22 to boost, observing the readings of the first pressure gauge 41 and the second pressure gauge 42 in the boosting process, ensuring that the boosting rate does not exceed 10bar/min, if the boosting rate is difficult to control in the boosting process, adjusting the valve opening degrees of the first control valve 51 and the third control valve 53 to be small, and adjusting the valve opening degree of the second control valve 52 to be large, if the boosting rate cannot be effectively controlled through the operation, slowly opening the fourth control valve 54, and performing auxiliary control on the boosting rate.

(3) Carrying out pressure maintaining operation, specifically: after the pressure is increased to a preset pressure maintaining pressure value, closing the first control valve 51, the second control valve 52, the third control valve 53 and the fourth control valve 54, keeping the test states of other components unchanged, observing whether the readings of the first pressure gauge 41 and the second pressure gauge 42 can be kept constant, and entering the pressure maintaining state if the readings are kept constant; and after maintaining the pressure for at least 10min, checking the surface and the welding line of the device to be tested 9 by a worker, and checking whether leakage, water seepage and the like exist.

(4) Carrying out a depressurization operation, in particular: after the pressure maintaining is finished, the valve opening degree of the first control valve 51 and the second control valve 52 is arranged in a larger opening degree, then the fourth control valve 54 is opened slowly, the reading of the first pressure gauge 41 and the reading of the second pressure gauge 42 are observed in the pressure reducing process, the pressure reducing rate is guaranteed not to exceed 10bar/min, if the situation that the pressure reducing rate is difficult to control occurs in the pressure reducing process, the valve opening degree of the first control valve 51 and the second control valve 52 can be reduced, if the pressure reducing rate cannot be effectively controlled through the operation, the third control valve 53 is opened slowly, intermittent water supplementing operation is carried out through operating the test pump 22, and the pressure reducing rate is controlled in an auxiliary mode. After the pressure had been reduced to atmospheric pressure, the device 9 to be tested was checked for any significant residual deformation.

(5) Performing a drainage operation, specifically: after the test is completed, the first control valve 51, the third control valve 53 and the fourth control valve 54 are opened, the exhaust device of the device to be tested 9 and the exhaust member 12 of the pressure buffer container 1 are opened, and the test water is drained.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A nuclear power station container/heat exchanger hydrostatic test pressure control device which characterized in that: the method comprises the following steps:

a pressurizing assembly: the pressurizing assembly comprises a first branch pipeline and a test pump, one end of the first branch pipeline is communicated with the main pipeline, and the other end of the first branch pipeline is communicated with the test pump;

2. The hydrostatic test pressure control apparatus of nuclear power plant vessel/heat exchanger of claim 1, wherein: the valve module include first control valve, second control valve, third control valve and fourth control valve, first control valve setting be located first lateral canal with wait the trunk line between the test equipment on, the second control valve setting be located first lateral canal with the trunk line between the pressure surge vessel on, the third control valve setting be in first lateral canal on, the fourth control valve setting be in the second lateral canal on.

3. The hydrostatic test pressure control apparatus of nuclear power plant vessel/heat exchanger of claim 2, wherein: the first control valve, the second control valve, the third control valve and the fourth control valve can bear pressure more than or equal to 30MPa; the first control valve, the second control valve, the third control valve and the fourth control valve are needle valves.

4. The hydrostatic test pressure control apparatus of nuclear power plant vessel/heat exchanger of claim 1, wherein: the pressure measuring component comprises a first pressure gauge and a second pressure gauge, the first pressure gauge is arranged on the main pipeline between the first branch pipeline and the device to be tested, and the second pressure gauge is arranged on the main pipeline between the first branch pipeline and the pressure buffer container.

5. The nuclear power plant vessel/heat exchanger hydrostatic test pressure control apparatus of claim 4, wherein: the measuring range of the first pressure gauge and the second pressure gauge is 1.5-3 times of the test pressure of the equipment to be tested, and the precision grade of the first pressure gauge and the second pressure gauge is more than or equal to 0.4 grade.

6. The nuclear power plant vessel/heat exchanger hydrostatic test pressure control apparatus of claim 1, wherein: the pressure control device for the hydrostatic test of the nuclear power station container/heat exchanger also comprises a rubber hose, and the other end of the main pipeline is connected with the equipment to be tested through the rubber hose; the rubber tube can bear the pressure of more than or equal to 30MPa.

7. The hydrostatic test pressure control apparatus of nuclear power plant vessel/heat exchanger of claim 1, wherein: the pressure control device for the hydrostatic test of the nuclear power station container/heat exchanger further comprises a safety valve assembly, wherein the safety valve assembly comprises a third branch pipeline and a safety valve arranged on the third branch pipeline, and the third branch pipeline is communicated with a main pipeline between the first branch pipeline and the device to be tested.

8. The nuclear power plant vessel/heat exchanger hydrostatic test pressure control apparatus of claim 7, wherein: the setting pressure of the safety valve is 1.1 times of the test pressure of the equipment to be tested.

9. The hydrostatic test pressure control apparatus of nuclear power plant vessel/heat exchanger of claim 1, wherein: the pressure buffer container comprises a container body and an exhaust piece arranged on the container body; the container body can bear the pressure of more than or equal to 30MPa.

10. The hydrostatic test pressure control apparatus of nuclear power plant vessel/heat exchanger of claim 1, wherein: the rated pressure of the test pump is more than or equal to 30MPa; the test pump adopts a hand-press test pump.