A combined voltage stabilization system applicable to valve reliability tests

Abstract

The present invention discloses a combined voltage stabilizing system applicable to valve reliability tests, comprising: an interface module for connecting with a valve under test; a high-temperature voltage stabilizing tank, the bottom of which is connected to the interface module through a first water outlet pipe, and the top of which is connected to the interface module through a first air outlet pipe; a low-temperature voltage stabilizing tank, the bottom of which is communicated with the interface module and the top of the high-temperature voltage stabilizing tank respectively through a second water outlet pipe and a third water outlet pipe; a plurality of voltage stabilizing and expanding tanks, which are communicated with the interface module and the top of the low-temperature voltage stabilizing tank respectively through a second air outlet pipe and a third air outlet pipe, and valves are respectively arranged on each pipeline; an air supplement component for respectively supplementing air into each voltage stabilizing and expanding tank; and a water supplement component for supplementing water into the low-temperature voltage stabilizing tank and the high-temperature voltage stabilizing tank. The present invention can carry out various different test items, a set of system can generate various test conditions, and at the same time, a plurality of voltage stabilizing and expanding tanks are used in series / parallel as a pressure source, which is economical, can be used in a graded manner in daily life, and has a high utilization rate.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage stabilization, and particularly relates to a combined voltage stabilization system applicable to the reliability test of valves. Background Art

[0002] The reliability test of nuclear-grade valves needs to simulate the action ability of valves under actual use conditions. Different from the qualification test, the characteristics of the reliability test of nuclear-grade valves are as follows: 1) The reliability test is repeated many times (about a hundred times), and there are many test items (gas test, fluid test, temperature rise and fall test, pressure rise and fall test); 2) Multiple batches of large quantities of test pieces carry out tests simultaneously / differently; 3) There is a need for multiple fluid blockage tests; 4) Conducting a fluid blockage test on a large-diameter nuclear-grade valve requires a huge voltage stabilizer. As a pressure source, the traditional single voltage stabilizer has extremely high construction costs and maintenance difficulties, and the number of large-diameter nuclear-grade valves is small, so the practical value of building a single voltage stabilizer is not high.

[0003] Currently, there is a lack of a voltage stabilization test system that can simultaneously meet the requirements of all test items of the above-mentioned nuclear-grade valve reliability test. Therefore, this application specifically proposes a combined voltage stabilization system applicable to the reliability test of valves to solve the above problems. Summary of the Invention

[0004] The main purpose of the present invention is to provide a combined voltage stabilization system for reliability tests that meets all the requirements of the reliability test of nuclear-grade valves.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: A combined voltage stabilization system applicable to the reliability test of valves, comprising:

[0006] An interface module for connecting with the valve under test;

[0007] A high-temperature voltage stabilization tank, inside which there is an electric heating element for heating the water inside the high-temperature voltage stabilization tank into saturated water. The water outlet at the bottom of the high-temperature voltage stabilization tank is connected to the interface module through a first water outlet pipe, and the gas outlet at the top of the high-temperature voltage stabilization tank is connected to the interface module through a first gas outlet pipe. A first valve and a second valve are respectively arranged on the first water outlet pipe and the first gas outlet pipe to control the on / off of the first water outlet pipe and the first gas outlet pipe respectively;

[0008] A low-temperature voltage stabilization tank filled with water. The water outlet at the bottom of the low-temperature voltage stabilization tank is respectively connected to the interface module and the top of the high-temperature voltage stabilization tank through a second water outlet pipe and a third water outlet pipe. A third valve and a fourth valve are respectively arranged on the second water outlet pipe and the third water outlet pipe to control the on / off of the second water outlet pipe and the third water outlet pipe respectively;

[0009] Multiple voltage stabilizing and volume expanding tanks, each containing compressed gas. The outlet of each voltage stabilizing and volume expanding tank is connected to the interface module and the top of the low-temperature voltage stabilizing tank through a second outlet pipe and a third outlet pipe respectively. A fifth valve and a sixth valve are respectively arranged on the second outlet pipe and the third outlet pipe to control the on-off of the second outlet pipe and the third outlet pipe. The air pressure in at least one voltage stabilizing and volume expanding tank is greater than that in the remaining voltage stabilizing and volume expanding tanks;

[0010] An air replenishing component for respectively replenishing air into each voltage stabilizing and volume expanding tank;

[0011] A water replenishing component for replenishing water into the low-temperature voltage stabilizing tank and the high-temperature voltage stabilizing tank.

[0012] Further, a preheater is also arranged on the third outlet pipe, and the preheater is used to preheat the water in the third outlet pipe.

[0013] Further, a seventh valve is also arranged on the third outlet pipe, and the preheater is arranged between the seventh valve and the fourth valve installed on the third outlet pipe.

[0014] Further, the pipe equivalent area of the first outlet pipe and the first outlet pipe is greater than the pipe equivalent area of the third outlet pipe. The pipe equivalent area of the third outlet pipe is greater than the pipe equivalent area of the third outlet pipe. The pipe equivalent area of the third outlet pipe is greater than the equivalent area of the measured valve at the maximum test opening.

[0015] Further, when providing water and head for the saturated water fluid blocking test, the gas space is required before the experiment to be calculated according to the following formula:

[0016]

[0017] In the formula, p is the pre-test pressure requirement, unit MPa; is the density corresponding to saturated water; is the mass of saturated water discharged during the test; dp is the required pressure difference before and after the test, unit MPa;

[0018] Among them,

[0019] In the formula, A is the equivalent flow area of the measured valve opening, unit m 2 ; is the valve action time, unit s; P is the pressure in the high-temperature voltage stabilizing tank, unit MPa.

[0020] Further, when providing steam and head for the saturated steam fluid blocking test, the gas space is required before the experiment to be calculated according to the following formula:

[0021]

[0022] Wherein, p is the pressure requirement before the test, with the unit of MPa; is the density of the corresponding saturated water; is the mass of the saturated water discharged during the test; dp is the pressure difference required before and after the test, with the unit of MPa;

[0023] Among them,

[0024] Wherein, A is the equivalent flow area of the opening of the valve under test, with the unit of m 2 ; is the density of high-temperature saturated steam; is the valve action time, with the unit of s; P is the pressure in the high-temperature constant-pressure tank, with the unit of MPa.

[0025] Furthermore, when providing different pressures for the pressure alternating test, different pressure transmissions are realized through the switch interface module; before conducting the test, different combinations of container tanks need to be selected according to the test section and the volume of the valve under test. The selection needs to comply with the following formula:

[0026]

[0027] Wherein: is the pressure inside any one container at the start of the alternating pressure, is the gas space volume of the corresponding container, is the density of the water in the corresponding container, represents the initial density of the water in another container, represents the mass of the water in the test section at the start of the test.

[0028] Furthermore, when providing different pressures for the pressure alternating test, different pressure transmissions are realized through the switch interface module; before conducting the test, different combinations of container tanks need to be selected according to the test section and the volume of the valve under test. If, according to the test requirements, the control requirement for the pressure change needs to reach dp, and it is satisfied that the container is not filled or emptied during X times of pressure alternating tests, the following formula conditions need to be met:

[0029]

[0030] Wherein: is the pressure inside any one container at the start of the alternating pressure, is the gas space volume of the corresponding container, is the density of the water in the corresponding container, represents the initial density of the water in another container, represents the mass of the water in the test section at the start of the test.

[0031] Further, when conducting the automatic temperature rise / fall and exhaust control experiment, the temperature rise rate and the heating power of the electric heating element are calculated according to the following formula;

[0032] In the formula, Q represents the heating power of the electric heating element, c is the specific heat at the pressure P of the high-temperature pressure stabilizing tank, m represents the mass of water in the high-temperature pressure stabilizing tank, is the adjustment factor;

[0033] where the computer collects a temperature and Q at regular intervals to form an array , and according to perform least squares fitting to obtain a value, and then adjust the output power of the electric heating element each time.

[0034] Further, when the high-temperature pressure stabilizing tank uses steam pressure stabilization, it includes two processes: a) establishing a steam space; b) raising the temperature and pressure;

[0035] For a) establishing a steam space: first raise the pressure of the high-temperature pressure stabilizing tank to 0.5 MPa, then turn on the electric heating element, and control the medium in the container to steadily rise in temperature according to the scheme, then open the exhaust valve at the top of the high-temperature pressure stabilizing tank, exhaust and relieve pressure, so that a steam space is established at the top of the high-temperature pressure stabilizing tank, and automatically monitor the water level to drop to the preset H1 value, and then close the top exhaust valve;

[0036] For b) raising the temperature and pressure: turn on the electric heating element, and control the medium in the container to raise the temperature and pressure according to the scheme. During the temperature rise process, automatically detect the water level in the high-temperature pressure stabilizing tank. If the water level is higher than H2, the drain valve is opened for drainage; if the water level is lower than H3, the water replenishing component is connected to the first gas outlet pipe, and spray water replenishment is carried out from the top of the high-temperature pressure stabilizing tank;

[0037] Among them, the calculation methods of H1, H2, and H3 are as follows:

[0038]

[0039] , ;

[0040] In the formula, is the height of the high-temperature pressure stabilizing tank container; is the target water level manually set according to the experimental requirements; is the density of the target saturated water; is the density of the target saturated steam; is the density of the saturated steam in the corresponding container; is the density of saturated water in the corresponding container.

[0041] Further, the air supplement component includes a pumping member, a main gas transmission pipe, and a plurality of gas transmission branch pipes. The pumping member is connected to the main gas transmission pipe for conveying gas to the main gas transmission pipe. One end of each gas transmission branch pipe is connected to the corresponding pressure stabilizing and volume expanding tank, and the other end is connected to the main gas transmission pipe. Moreover, an eighth valve is provided on each gas transmission branch pipe, and the eighth valve is used to control the on / off of each gas transmission branch pipe; a ninth valve is provided on the main gas transmission pipe, and the ninth valve is used to control the on / off between the main gas transmission pipe and each gas transmission branch pipe.

[0042] Further, the water supplement component includes a water supplement pipe and a water supplement valve provided on the water supplement pipe; one end of the water supplement pipe is connected to a pump or a pressurized water source, and the other end is communicated with the interface module, and the water supplement valve is used to control the on / off of the water supplement pipe.

[0043] The beneficial effects of the present invention are as follows:

[0044] The present invention can carry out various different test items. One set of system can generate various test conditions. At the same time, a plurality of pressure stabilizing and volume expanding tanks are connected in series / parallel as the pressure source, which is economical and can be graded and used daily, with high utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is the working principle diagram of the combined pressure stabilizing system applicable to valve reliability test of the present invention.

[0046] In the figure:

[0047] 1. Interface module; 2. High-temperature pressure stabilizing tank; 21. First water outlet pipe; 22. First gas outlet pipe; 23. First valve; 24. Second valve; 3. Low-temperature pressure stabilizing tank; 31. Second water outlet pipe; 32. Third water outlet pipe; 33. Third valve; 34. Fourth valve; 35. Seventh valve; 36. Preheater; 4. Pressure stabilizing and volume expanding tank; 41. Second gas outlet pipe; 42. Third gas outlet pipe; 43. Fifth valve; 44. Sixth valve; 5. Pumping member; 51. Main gas transmission pipe; 52. Gas transmission branch pipe; 53. Eighth valve; 54. Ninth valve; 6. Water supplement pipe; 61. Water supplement valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0049] Please refer to Figure 1 .

[0050] The present invention discloses a combined pressure stabilizing system applicable to valve reliability tests, comprising:

[0051] An interface module 1 for connecting to a valve under test (during specific tests, it is an interface with a switching valve or an interface without a switching valve);

[0052] A high-temperature pressure stabilizing tank 2, inside which there is an electric heating element for heating the water inside the high-temperature pressure stabilizing tank 2 into saturated water. The water outlet at the bottom of the high-temperature pressure stabilizing tank 2 is connected to the interface module 1 through a first water outlet pipe 21, and the gas outlet at the top of the high-temperature pressure stabilizing tank 2 is connected to the interface module 1 through a first gas outlet pipe 22. A first valve 23 and a second valve 24 are respectively arranged on the first water outlet pipe 21 and the first gas outlet pipe 22 to control the on-off of the first water outlet pipe 21 and the first gas outlet pipe 22;

[0053] A low-temperature pressure stabilizing tank 3 filled with normal-temperature water. The water outlet at the bottom of the low-temperature pressure stabilizing tank 3 is respectively communicated with the interface module 1 and the top of the high-temperature pressure stabilizing tank 2 through a second water outlet pipe 31 and a third water outlet pipe 32. A third valve 33 and a fourth valve 34 are respectively arranged on the second water outlet pipe 31 and the third water outlet pipe 32 to control the on-off of the second water outlet pipe 31 and the third water outlet pipe 32;

[0054] Multiple pressure stabilizing and expanding tanks 4, each of which is filled with compressed gas. The gas outlets of the pressure stabilizing and expanding tanks 4 are respectively communicated with the interface module 1 and the top of the low-temperature pressure stabilizing tank 3 through a second gas outlet pipe 41 and a third gas outlet pipe 42. A fifth valve 43 and a sixth valve 44 are respectively arranged on the second gas outlet pipe 41 and the third gas outlet pipe 42 to control the on-off of the second gas outlet pipe 41 and the third gas outlet pipe 42, and the air pressure in at least one of the pressure stabilizing and expanding tanks 4 is greater than the air pressure in the remaining pressure stabilizing and expanding tanks 4;

[0055] An air supplement component for respectively supplementing air into each of the pressure stabilizing and expanding tanks 4;

[0056] A water supplement component for supplementing water into the low-temperature pressure stabilizing tank 3 and the high-temperature pressure stabilizing tank 2.

[0057] In specific implementation, when conducting the saturated water fluid blocking test, the water outlet of the high-temperature pressure stabilizing tank 2 is connected to the interface module 1. The low-temperature pressure stabilizing tank 3 is used to supply water to the high-temperature pressure stabilizing tank 2, and multiple pressure stabilizing and expanding tanks 4 are used to stabilize the pressure of the system. When conducting the saturated steam fluid blocking test, the gas outlet of the high-temperature pressure stabilizing tank 2 is connected to the interface module 1. The low-temperature pressure stabilizing tank 3 is still used to supply water to the high-temperature pressure stabilizing tank 2, and multiple pressure stabilizing and expanding tanks 4 are used to stabilize the pressure of the system. At the same time, the high-temperature pressure stabilizing tank 2 can be used for high-temperature container tests and also for low-temperature container tests (when conducting low-temperature container tests, the electric heating element can be turned off). At least one pressure stabilizing and expanding tank 4 with a relatively large internal air pressure can be used to conduct pressure alternating tests, and can also be used for the sealing test of test pieces and the pressure test of test pipelines alone. At the same time, the low-temperature pressure stabilizing tank 3 and each pressure stabilizing and expanding tank 4 can be independently connected to the interface module 1 to conduct corresponding test items.

[0058] The present invention can conduct various different test items. One set of system can generate various test conditions. At the same time, multiple pressure stabilizing and expanding tanks 4 are connected in series / parallel as the pressure source, which is economical, can be graded daily, and has a high utilization rate.

[0059] Preferably, the gas contained in each pressure stabilizing and expanding tank 4 is an inert gas. More preferably, the inert gas is nitrogen.

[0060] Preferably, safety valves are provided at the tops of all tanks to release the excessive pressure inside the tanks and prevent the internal pressure of the tanks from being too high.

[0061] In an embodiment, a seventh valve 35 is further provided on the third water outlet pipe 32 for connecting the water outlet of the low-temperature pressure stabilizing tank 3 and the top of the high-temperature pressure stabilizing tank 2. A preheater 36 is provided between the seventh valve 35 and the fourth valve 34 installed on the third water outlet pipe 32. The preheater 36 is used to preheat the water in the third water outlet pipe 32. Such a design can, on the one hand, improve the heating speed of the water in the high-temperature pressure stabilizing tank 2 and make it quickly become saturated water. On the other hand, when conducting the saturated steam test, it can prevent the temperature of the saturated steam from dropping too quickly and avoid the sudden drop in the pressure inside the high-temperature pressure stabilizing tank 2 (when conducting the saturated steam test, the pressure inside the high-temperature pressure stabilizing tank 2 comes from the steam pressure. Once the steam quickly condenses when it meets cold, it is easy to make the pressure inside the high-temperature pressure stabilizing tank 2 unstable). At the same time, by setting the preheater 36 between the seventh valve 35 and the fourth valve 34, the third water outlet pipe 32 can be disconnected from the preheater 36 through the seventh valve 35 and the fourth valve 34, which is convenient for the maintenance and repair of the preheater 36.

[0062] In one embodiment, the equivalent area of the pipelines of the first water outlet pipe 21 and the first air outlet pipe 22 is greater than that of the third water outlet pipe 32, the equivalent area of the pipeline of the third water outlet pipe 32 is greater than that of the third air outlet pipe 42, and the equivalent area of the pipeline of the third air outlet pipe 42 is greater than the equivalent area of the valve under test at the maximum test opening.

[0063] In specific implementation, when the valve under test is being tested, if the valve under test cannot be closed, the direct result is that the system pressure will rapidly drop; if the pipeline of the system is set in the above manner, since the equivalent area of the valve under test is the smallest, critical flow will first occur at the valve under test, and the occurrence of critical flow can delay the pressure loss of the high-temperature pressure stabilizing tank 2; similarly, the pressure drop in the high-temperature pressure stabilizing tank 2 will successively cause critical flow to occur in the third air outlet pipe 42 and the third water outlet pipe 32, thereby slowing down the pressure loss speed of the container, which helps to find the corresponding valve on-site and prevent the system from losing pressure.

[0064] For example, taking the saturated water fluid blocking test as an example, this system serves as the source of water spraying and discharging, continuously providing water and pressure head; this system can maximally meet the fluid blocking test under the conditions of 17 MPa and 350 °C and at a 10% opening of a valve with a DN800 diameter.

[0065] There are 4 pressure stabilizing and volume expanding tanks 4, namely V1, V2, V3, and V4, which are filled with nitrogen. The low-temperature pressure stabilizing tank 3 is filled with cold water, and the high-temperature pressure stabilizing tank 2 is filled with saturated water; V1, V2, V3, and V4 serve as pressure stabilizing gas sources to provide a sufficiently large cold gas space. The low-temperature pressure stabilizing tank 3 serves as a water replenishment source to replenish the saturated water volume discharged from the high-temperature pressure stabilizing tank 2. The high-temperature pressure stabilizing tank 2 serves as a device for generating and discharging saturated water, where:

[0066] The volume of the high-temperature pressure stabilizing tank 2 is 6 m³, with a design temperature of 400 °C and a design pressure of 20 MPa;

[0067] The volume of the low-temperature pressure stabilizing tank 3 is 6 m³, with a design temperature of 200 °C and a design pressure of 20 MPa;

[0068] The volume of v4 is 5 m³, with a design temperature of 150 °C and a design pressure of 20 MPa;

[0069] The volume of v3 is 3 m³, with a design temperature of 150 °C and a design pressure of 20 MPa;

[0070] The volume of v2 is 1 m³, with a design temperature of 150 °C and a design pressure of 20 MPa;

[0071] The volume of V1 is 0.5 m³, with a design temperature of 150 °C and a design pressure of 40 MPa;

[0072] The pipeline connecting V1 - V2 - V3 - V4 is DN50, the pipeline connecting the low - temperature pressure stabilizing tank 3 to the high - temperature pressure stabilizing tank 2 is DN200, and the pipeline of the high - temperature pressure stabilizing tank 2 is DN300;

[0073] During actual use, the pressure requirement before the test is p, and the density of the corresponding saturated water is , and the mass of the saturated water discharged during the test is . If the pressure difference before and after the test is required to be dp MPa, then the required gas space before the experiment needs to be calculated according to the following formula:

[0074]

[0075] During the test, different containers are arranged according to the value, such as:

[0076] When + is less than 3 m³, only the high - temperature pressure stabilizing tank 2 is used. There is an electric heating element at the bottom inside the high - temperature pressure stabilizing tank 2. If the heating end of the electric heating element is exposed to the steam / nitrogen environment, it is easy to be damaged. The heating end of the electric heating element reaches the middle of the high - temperature pressure stabilizing tank 2. Therefore, when the high - temperature pressure stabilizing tank 2 is not full of water, the effective discharge volume is only 50%, that is, 3 m³.

[0077] When + <9 m³, only the low - temperature pressure stabilizing tank 3 and the high - temperature pressure stabilizing tank 2 containers can be used;

[0078] When + >9 m³, one or all of V1\V2\V3\V4 can be selected for combination according to the specific value.

[0079] For the mass of the saturated water discharged during the test, which is , it is estimated according to the following formula:

[0080]

[0081] Where: A is the equivalent flow area of the opening of the valve to be measured, with the unit of m 2 ;

[0082] is the valve action time, with the unit of s;

[0083] P is the pressure inside the high - temperature pressure stabilizing tank, with the unit of MPa.

[0084] In one embodiment, the air supplement component includes a pumping component 5, a main gas transmission pipe 51, and a plurality of gas transmission branch pipes 52. The pumping component 5 is connected to the main gas transmission pipe 51 and is used to convey gas to the main gas transmission pipe 51. One end of each gas transmission branch pipe 52 is connected to the corresponding pressure stabilizing and volume expanding tank 4, and the other end is connected to the main gas transmission pipe 51. Moreover, an eighth valve 53 is provided on each gas transmission branch pipe 52, and the eighth valve 53 is used to control the on-off of each gas transmission branch pipe 52; a ninth valve 54 is provided on the main gas transmission pipe 51, and the ninth valve 54 is used to control the on-off between the main gas transmission pipe 51 and each gas transmission branch pipe 52. With such a design, air can be supplemented according to the characteristics of each pressure stabilizing and volume expanding tank.

[0085] Preferably, it further includes a gas storage tank, which is used to store inert gas. The gas storage tank is connected to the pumping component 5 to provide inert gas to the system. More preferably, the pumping component 5 can be components such as an air compressor or an air extraction pump in the prior art.

[0086] In one embodiment, the water supplement component includes a water supplement pipe 6 and a water supplement valve 61 provided on the water supplement pipe 6; one end of the water supplement pipe 6 is connected to a pump or a pressurized water source, and the other end is connected to the interface module 1. The water supplement valve 61 is used to control the on-off of the water supplement pipe 6. With such a design, since the water outlets at the bottoms of the low-temperature pressure stabilizing tank 3 and the high-temperature pressure stabilizing tank 2 are connected to the interface module 1 through pipelines, when replenishing water, water can be replenished into the low-temperature pressure stabilizing tank 3 and the high-temperature pressure stabilizing tank 2 through this pipeline, without the need to separately set up a water supplement pipeline, making the overall pipeline more concise.

[0087] In one embodiment, when conducting a saturated steam fluid blockage test, the present system serves as the source of the sprayed steam, continuously providing steam and pressure head:

[0088] The pressure stabilizing system can maximally meet the fluid blockage test under the conditions of 17 MPa and 350 °C, with a 10% opening of the DN800-caliber valve.

[0089] V1, V2, V3, and V4 serve as pressure stabilizing gas sources to provide a sufficiently large cold-state gas space. The low-temperature pressure stabilizing tank 3 serves as a water supplement source to supplement the saturated water volume discharged from the high-temperature pressure stabilizing tank 2. The high-temperature pressure stabilizing tank 2 serves as a saturated water generation and discharge device, and is connected to the fluid blockage test section through the first gas discharge pipe 22 and the interface module 1.

[0090] During actual use, the pressure requirement before the test is P, and the corresponding density of the saturated water is , the mass of the saturated water discharged during the test is , and the required pressure difference before and after the test is dp MPa. Then, the required gas space needs to be budgeted according to the following formula:

[0091]

[0092] During the test, Arrange different containers according to the value, such as:

[0093] When + When it is less than 3 m³, only the high-temperature pressure stabilizing tank 2 is used. There is an electric heating element at the bottom of the high-temperature pressure stabilizing tank 2. If the heating end of the electric heating element is exposed to the steam / nitrogen environment, it is easy to be damaged. The heating end of the electric heating element reaches the middle of the high-temperature pressure stabilizing tank 2. Therefore, when the high-temperature pressure stabilizing tank 2 is not filled with water, the effective discharge volume is only 50%, that is, 3 m³.

[0094] When + <9 m³, only the low-temperature pressure stabilizing tank and the high-temperature pressure stabilizing tank can be used;

[0095] When + >9 m³, one or all of V1, V2, V3, and V4 can be selected for combination according to the specific value.

[0096] For the mass of saturated water discharged during the test Estimate according to the following formula:

[0097]

[0098] A is the equivalent hydraulic area of the opening of the valve under test, in m 2 ;

[0099] is the density of high-temperature saturated steam;

[0100] is the valve action time, in s;

[0101] P is the pressure in the high-temperature pressure stabilizing tank, in MPa.

[0102] In one embodiment, when conducting the pressure cycling test, this system serves as a pressure source to provide different pressures to the test section:

[0103] During the test, different pressure transmissions are realized through the switch interface module 1. Before conducting the test, different combinations of container tanks need to be selected according to the test section and the volume of the valve under test. The selection needs to comply with the following formula:

[0104]

[0105] Where: is the pressure inside any container at the start of the alternating pressure, is the gas space volume of the corresponding container, is the density of water in the corresponding container, represents the density of the initial water in another container, represents the mass of water in the test section at the start of the test.

[0106] The above are the formulas for the double-pressure alternating test, which can be extended to multiple pressure alternating test scenarios. Specifically, it can be extended according to the test requirements. Select appropriate containers and corresponding requirements for the gas space of the containers. The container combinations selected according to the formulas can meet the requirements of at least 50 pressure alternating tests. The pressure drop of the high-pressure container is controlled within 0.5 MPa, and the pressure rise of the low-pressure container is controlled within 0.5 MPa.

[0107] If, according to the test requirements, the control requirement for the pressure change needs to reach dp, and the container does not need to be filled or drained for X pressure alternating tests, then the following formula conditions need to be met:

[0108]

[0109] In one embodiment, during the automatic temperature rise and fall and exhaust control of the test:

[0110] For containers V1-V4 and the low-temperature pressure stabilizing tank 3, they are mainly used under non-heating conditions. Therefore, nitrogen is filled and supplemented through the air supplement component, and water is supplemented and drained from the bottom of the container.

[0111] The high-temperature pressure stabilizing tank 2 can be used for high-temperature container tests and low-temperature container tests. The method for low-temperature container tests is the same as that for containers V1-V4 and the low-temperature pressure stabilizing tank 3. For high-temperature container tests, there are two usage scenarios: 1) Using nitrogen for pressure stabilization, including connecting other containers as a nitrogen pressure stabilizing source; 2) Using saturated water vapor for pressure stabilization.

[0112] For the case where the high-temperature pressure stabilizing tank 2 uses nitrogen for pressure stabilization, the medium is heated through the electric heating element at the bottom of the container. At this time, the pressure is adjusted by filling and discharging nitrogen. The temperature rise rate and the heating power of the electric heating element are calculated according to the following formula: , where Q represents the heating power of the electric heating element, c is the specific heat at the pressure P of the high-temperature pressure stabilizing tank container, m represents the mass of water in the high-temperature pressure stabilizing tank, is the adjustment factor, is automatically calculated by the computer every time the test is performed to compensate for the influence of nitrogen heating and temperature rise. The computer collects a temperature and Q every 2 s. In the case of a small temperature difference, the influence of temperature on the change in the specific heat of water can be ignored, and then an array is obtained. According to perform the least squares fitting to obtain a value, and then adjust the output power of the electric heating element each time, and finally achieve stable temperature rise of the medium in the voltage stabilizer.

[0113] For the case of using steam to stabilize the pressure in the high-temperature pressure stabilizing tank, V1-V4 and the low-temperature pressure stabilizing tank are isolated from the high-temperature pressure stabilizing tank, and the high-temperature pressure stabilizing tank is automatically controlled to heat up. There are two processes here: a) Establish a steam space; b) Heat up and increase the pressure;

[0114] For establishing the steam space, the computer first controls the water replenishing component to increase the pressure of the high-temperature pressure stabilizing tank to 0.5 MPa, and then turns on the electric heating element. According to the scheme, the medium in the container is steadily heated up (-5°C, the saturation water temperature corresponding to 0.5 MPa). Here, Q represents the heating power of the electric heating element, c is the specific heat at the pressure P of the high-temperature pressure stabilizing tank container, m represents the mass of steam and water in the high-temperature pressure stabilizing tank, is the adjustment factor, is automatically calculated by the computer during each test to compensate for the influence of uneven high-temperature. The computer collects a temperature and Q every 2 s. In the case of a small temperature difference, the influence of temperature on the change of the specific heat of water can be ignored, and then an array is obtained. According to perform least squares fitting to obtain a value. Then, adjust the output power of the electric heating element each time, and then slightly open the safety valve (also called the exhaust valve) at the top of the high-temperature pressure stabilizing tank to exhaust and relieve pressure, so that a steam space is slowly established at the top of the high-temperature pressure stabilizing tank. After the computer automatically monitors that the water level drops to the preset H1 value, close the top exhaust valve;

[0115] After that, turn on the electric heating element and control the medium in the container to heat up and increase the pressure according to the scheme. Here, Q represents the heating power of the electric heating element, c is the specific heat at the pressure P of the high-temperature pressure stabilizing tank container, m represents the mass of steam and water in the high-temperature pressure stabilizing tank, is the adjustment factor, is automatically calculated by the computer during each test to compensate for the influence of uneven high-temperature. The computer collects a temperature and Q every 2 s. In the case of a small temperature difference, the influence of temperature on the change of the specific heat of water can be ignored, and then an array is obtained. According to perform least squares fitting to obtain a value. During the heating process, the computer detects the water level. If the water level is higher than H2, the computer slightly opens the drain valve at the bottom of the high-temperature pressure stabilizing tank. If the water level is lower than H3, connect the water replenishing component to the first gas outlet pipe to spray water for replenishment from the top of the high-temperature pressure stabilizing tank (because there is less water and higher temperature in the tank at this time, spraying water for replenishment can quickly cool the temperature in the tank while replenishing water).

[0116] The computer automatic calculation method for H1, H2, and H3:

[0117] The height of the high-temperature pressure stabilizing tank container is , when conducting the experiment, a target water level needs to be set manually , which is determined according to the experiment requirements (i.e., the water level to be controlled), then:

[0118] , .

[0119] Calculation method for H1

[0120]

[0121] In the formula, is the density of the target saturated water; is the density of the target saturated steam; is the density of the saturated steam in the corresponding container; is the density of the saturated water in the corresponding container;

[0122] According to the actual situation of the repeated heating and cooling of the container, perform least squares fitting. For different high-temperature pressure stabilizing tank designs and different heat insulation measures, the values are all different.

[0123] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0124] It should be noted that if there are directional indications (such as up and down) involved in the embodiments of the present invention, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If the specific posture changes, then the directional indications will also change accordingly.

[0125] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0126] In addition, "a plurality of" means two or more.

Claims

1. A combined voltage stabilizing system suitable for valve reliability testing, characterized in that: include: An interface module (1), used for connecting to a valve to be tested; A high-temperature pressure stabilizing tank (2) is provided with an electric heating element inside, the electric heating element is used to heat the water inside the high-temperature pressure stabilizing tank (2) into saturated water, the water outlet at the bottom of the high-temperature pressure stabilizing tank (2) is connected to the interface module (1) through a first water outlet pipe (21), the air outlet at the top of the high-temperature pressure stabilizing tank (2) is connected to the interface module (1) through a first air outlet pipe (22), and the first water outlet pipe (21) and the first air outlet pipe (22) are respectively provided with a first valve (23) and a second valve (24), which are respectively used to control the opening and closing of the first water outlet pipe (21) and the first air outlet pipe (22); A low-temperature pressure-stabilizing tank (3) containing water, wherein a water outlet at the bottom of the low-temperature pressure-stabilizing tank (3) is connected to the interface module (1) and the top of the high-temperature pressure-stabilizing tank (2) through a second water outlet pipe (31) and a third water outlet pipe (32), respectively; a third valve (33) and a fourth valve (34) are respectively provided on the second water outlet pipe (31) and the third water outlet pipe (32), respectively used to control the opening and closing of the second water outlet pipe (31) and the third water outlet pipe (32); A plurality of pressure-stabilizing and expansion tanks (4), each of which contains compressed gas, the gas outlet of each of which is connected to the interface module (1) and the top of the low-temperature pressure-stabilizing tank (3) through a second gas outlet pipe (41) and a third gas outlet pipe (42), respectively; a fifth valve (43) and a sixth valve (44) are respectively provided on the second gas outlet pipe (41) and the third gas outlet pipe (42), respectively used to control the opening and closing of the second gas outlet pipe (41) and the third gas outlet pipe (42), wherein the gas pressure in at least one of the pressure-stabilizing and expansion tanks (4) is greater than the gas pressure in the other pressure-stabilizing and expansion tanks (4); An air supply component, used for supplying air to each pressure-stabilizing and expanding tank (4); The water replenishing component is used to replenish water into the low-temperature pressure stabilizing tank (3) and the high-temperature pressure stabilizing tank (2).

2. The combined voltage stabilizing system suitable for valve reliability testing according to claim 1, characterized in that: The third water outlet pipe (32) is also provided with a preheater (36), and the preheater (36) is used to preheat the water in the third water outlet pipe (32).

3. The combined voltage stabilizing system suitable for valve reliability testing according to claim 2, characterized in that: The third water outlet pipe (32) is also provided with a seventh valve (35), and the preheater (36) is provided between the seventh valve (35) and a fourth valve (34) installed on the third water outlet pipe (32).

4. The combined voltage stabilizing system suitable for valve reliability testing according to claim 1, characterized in that: The pipe equivalent area of ​​the first water outlet pipe (21) and the first air outlet pipe (22) is greater than the pipe equivalent area of ​​the third water outlet pipe (32), the pipe equivalent area of ​​the third water outlet pipe (32) is greater than the pipe equivalent area of ​​the third air outlet pipe (42), and the pipe equivalent area of ​​the third air outlet pipe (42) is greater than the equivalent area of ​​the tested valve at the maximum test opening.

5. The combined voltage stabilizing system suitable for valve reliability testing according to claim 1, characterized in that: When providing water and pressure head for saturated water fluid blocking test, the space required for gas before the test Calculate according to the following formula: In the formula, The pressure requirement before the test, unit: ; is the density of saturated water; is the mass of saturated water discharged during the test; To require the pressure difference before and after the test, the unit is ; in, In the formula, is the equivalent flow area of ​​the valve opening being tested, in units of ; Is the valve action time, unit ; is the pressure inside the high temperature pressure stabilizing tank (2), in units .

6. The combined voltage stabilizing system suitable for valve reliability testing according to claim 1, characterized in that: When providing steam and pressure head for saturated steam fluid blocking test, the gas space required before the test Calculate according to the following formula: In the formula, The pressure requirement before the test, unit: ; is the density of saturated water; is the mass of saturated water discharged during the test; To require the pressure difference before and after the test, the unit is ; in, In the formula, is the equivalent flow area of ​​the valve opening being tested, in units of ; is the density of high temperature saturated steam; Is the valve action time, unit ; P is the pressure inside the high temperature pressure tank (2), unit .

7. The combined voltage stabilizing system suitable for valve reliability testing according to claim 1, characterized in that: When providing different pressures for the pressure alternation test, different pressure transmissions are achieved through the switch interface module (1); before the test is carried out, different container tank combinations need to be selected according to the test section and the volume of the valve to be tested, and the selection needs to comply with the following formula: Where: is the pressure in any container when the alternating pressure starts. is the volume of the air space corresponding to the container, is the density of the water in the corresponding container, represents the initial density of water in another container, Indicates the mass of water in the test section at the beginning of the test.

8. The combined voltage stabilizing system suitable for valve reliability testing according to claim 1, characterized in that: When providing different pressures for the pressure alternation test, different pressure transmissions are achieved through the switch interface module (1); before the test is carried out, different container tank combinations need to be selected according to the test section and the volume of the valve to be tested. If the pressure change control requirements need to be met according to the test requirements, , and satisfies If the pressure alternating test does not perform pressure filling and exhausting operations on the container, the following conditions must be met: Where: is the pressure in any container when the alternating pressure starts. is the volume of the air space corresponding to the container, is the density of the water in the corresponding container, represents the initial density of water in another container, Indicates the mass of water in the test section at the beginning of the test.

9. The combined voltage stabilizing system suitable for valve reliability testing according to claim 1, characterized in that: When conducting automatic temperature rise and exhaust control experiments, the temperature rise rate and the heating power of the electric heating element are based on Perform calculations; In the formula, Indicates the heating power of the electric heating element. The container pressure of the high temperature pressure tank (2) The specific heat of Indicates the quality of water in the high temperature surge tank (2), is the adjustment factor; in The computer collects temperature and Make an array ,according to Perform the least squares fitting and get a value, and then adjust the output power of the electric heating element each time.

10. The combined voltage stabilizing system suitable for valve reliability testing according to claim 9, characterized in that: When the high temperature pressure stabilizing tank (2) is used for steam pressure stabilization, it includes two processes: a) establishing the steam space; b) increasing the temperature and pressure; For a) Establishing the steam space: First, raise the pressure of the high temperature surge tank (2) to , then turn on the heating element, according to The solution controls the medium in the container to steadily increase in temperature, then opens the exhaust valve at the top of the high-temperature pressure-stabilizing tank (2), exhausts and releases pressure, so that a steam space is established at the top of the high-temperature pressure-stabilizing tank (2), and automatically monitors the water level to drop to the preset level. After reaching the value, close the top exhaust valve; For b) temperature and pressure increase: turn on the electric heating element and follow the The solution controls the temperature and pressure of the medium in the container to increase. During the temperature increase process, the water level in the high temperature pressure regulating tank (2) is automatically detected. If the water level is higher than , then, the drain valve opens to drain water; if the water level is lower than Then, the water replenishment component is connected to the first air outlet pipe (22), and water is sprayed and replenished from the top of the high-temperature pressure stabilizing tank (2); in , , The following calculation method is used: ， ； In the formula, is the height of the high temperature surge tank (2); The target water level is manually set according to the experimental requirements; is the density of target saturated water; is the density of target saturated steam; is the density of saturated steam in the corresponding container; is the density of saturated water in the corresponding container.

11. The combined voltage stabilizing system suitable for valve reliability test according to claim 1, characterized in that: The gas replenishing component comprises a pumping component (5), a gas transmission main pipe (51) and a plurality of gas transmission branch pipes (52). The pumping component (5) is connected to the gas transmission main pipe (51) and is used to transmit gas to the gas transmission main pipe (51). One end of the gas transmission branch pipe (52) is connected to the corresponding pressure-stabilizing expansion tank (4), and the other end is connected to the gas transmission main pipe (51). In addition, each gas transmission branch pipe (52) is provided with an eighth valve (53), and the eighth valve (53) is used to control the on-off of each gas transmission branch pipe (52); the gas transmission main pipe (51) is provided with a ninth valve (54), and the ninth valve (54) is used to control the on-off between the gas transmission main pipe (51) and each gas transmission branch pipe (52).

12. The combined voltage stabilizing system suitable for valve reliability test according to claim 1, characterized in that: The water replenishment assembly comprises a water replenishment pipe (6) and a water replenishment valve (61) arranged on the water replenishment pipe (6); one end of the water replenishment pipe (6) is connected to a pump or a pressurized water source, and the other end is connected to the interface module (1); the water replenishment valve (61) is used to control the on and off of the water replenishment pipe (6).

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