Combined pressure stabilizing system suitable for valve reliability test

Abstract

The invention discloses a combined pressure stabilizing system suitable for a valve reliability test, and the system comprises an interface module which is connected with a tested valve; the bottom of the high-temperature surge tank is connected with the interface module through a first water outlet pipe, and the top is connected with the interface module through a first air outlet pipe; the bottom of the low-temperature surge tank is respectively communicated with the interface module and the top of the high-temperature surge tank through a second water outlet pipe and a third water outlet pipe; the plurality of pressure stabilizing and volume expanding tanks are respectively communicated with the interface module and the top of the low-temperature pressure stabilizing tank through a second air outlet pipe and a third air outlet pipe, and valves are respectively arranged on the pipelines; the air supplementing assembly is used for supplementing air into each pressure stabilizing and volume expanding tank; and the water replenishing assembly is used for replenishing water into the low-temperature surge tank and the high-temperature surge tank. According to the invention, various different test items can be carried out, one set of system can generate various test conditions, meanwhile, a plurality of pressure-stabilizing capacity-expanding tanks are connected in series / in parallel to serve as a pressure source, and the system is economical, can be used in a grading manner daily, and is high in utilization rate.

Description

Technical Field

[0001] The invention relates to the technical field of voltage stabilization, and in particular to a combined voltage stabilization system suitable for valve reliability testing. Background Art

[0002] The reliability test of nuclear-grade valves needs to simulate the valve's ability to move under actual use conditions. Unlike the identification test, the reliability test of nuclear-grade valves has the following characteristics: 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 are tested simultaneously / non-simultaneously; 3) There are multiple fluid blocking test requirements; 4) Large-caliber nuclear-grade valves require huge pressure regulators to carry out fluid blocking tests. The traditional single pressure regulator as a pressure source has extremely high construction cost and maintenance difficulty, while the number of large-caliber nuclear-grade valves is small, and the practical value of building a single pressure regulator 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. To this end, this application specifically proposes a combined voltage stabilization system suitable for valve reliability testing to solve the above-mentioned problem. Summary of the invention

[0004] The main purpose of the present invention is to provide a combined pressure stabilizing system for reliability testing that meets all requirements of nuclear-grade valve reliability testing.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a combined voltage stabilizing system suitable for valve reliability test, comprising: An interface module, used for connecting with the valve under test; A high-temperature pressure-suppressing tank is provided with an electric heating element inside, and the electric heating element is used to heat the water inside the high-temperature pressure-suppressing tank into saturated water. The water outlet at the bottom of the high-temperature pressure-suppressing tank is connected to the interface module through a first water outlet pipe, and the air outlet at the top of the high-temperature pressure-suppressing tank is connected to the interface module through a first air outlet pipe. The first water outlet pipe and the first air outlet pipe are respectively provided with a first valve and a second valve, which are respectively used to control the on-off of the first water outlet pipe and the first air outlet pipe; A low-temperature pressure-stabilizing tank, containing water, wherein a water outlet at the bottom of the low-temperature pressure-stabilizing tank is connected to the interface module and the top of the high-temperature pressure-stabilizing tank through a second water outlet pipe and a third water outlet pipe, respectively, and a third valve and a fourth valve are respectively provided on the second water outlet pipe and the third water outlet pipe, respectively, for controlling the on-off of the second water outlet pipe and the third water outlet pipe; A plurality of pressure-stabilizing and expansion tanks, each containing compressed gas, the gas outlet of each pressure-stabilizing and expansion tank being connected to the interface module and the top of the low-temperature pressure-stabilizing tank through a second gas outlet pipe and a third gas outlet pipe, respectively, a fifth valve and a sixth valve being provided on the second gas outlet pipe and the third gas outlet pipe, respectively, for controlling the on and off of the second gas outlet pipe and the third gas outlet pipe, wherein the gas pressure in at least one pressure-stabilizing and expansion tank is greater than the gas pressure in the other pressure-stabilizing and expansion tanks; An air supply component is used to supply air to each pressure-stabilizing and expansion tank respectively; The water replenishment component is used to replenish water into the low-temperature pressure stabilizing tank and the high-temperature pressure stabilizing tank.

[0006] Furthermore, a preheater is provided on the third water outlet pipe, and the preheater is used to preheat the water in the third water outlet pipe.

[0007] Furthermore, a seventh valve is provided on the third water outlet pipe, and the preheater is provided between the seventh valve and a fourth valve installed on the third water outlet pipe.

[0008] Furthermore, the pipe equivalent area of ​​the first water outlet pipe and the first air outlet pipe is larger than the pipe equivalent area of ​​the third water outlet pipe, the pipe equivalent area of ​​the third water outlet pipe is larger than the pipe equivalent area of ​​the third air outlet pipe, and the pipe equivalent area of ​​the third air outlet pipe is larger than the equivalent area of ​​the tested valve at the maximum test opening.

[0009] Furthermore, when providing water and pressure head for the saturated water fluid blocking test, the gas space required before the test Calculate according to the following formula:

[0010] Where, p is the pressure requirement before the test, unit: MPa; is the density of saturated water; is the mass of saturated water discharged during the test; dp is the pressure difference before and after the test, in MPa; in,

[0011] Where A is the equivalent flow area of ​​the valve opening being tested, in m 2 ; is the valve action time, unit is s; P is the pressure inside the high temperature pressure regulating tank, unit is MPa.

[0012] Furthermore, when providing steam and pressure head for saturated steam fluid blocking test, the gas space required before the test is Calculate according to the following formula:

[0013] Where, p is the pressure requirement before the test, unit: MPa; is the density of saturated water; is the mass of saturated water discharged during the test; dp is the pressure difference before and after the test, in MPa; in,

[0014] Where A is the equivalent flow area of ​​the valve opening being tested, in m 2 ; is the density of high temperature saturated steam; is the valve action time, unit is s; P is the pressure inside the high temperature pressure regulating tank, unit is MPa.

[0015] Furthermore, when different pressures are provided for the pressure alternation test, different pressure transmissions are achieved through the switch interface module; before conducting the test, 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:

[0016] 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.

[0017] Furthermore, when different pressures are provided for the pressure alternation test, different pressure transmissions are achieved through the switch interface module; before conducting the test, 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 demand needs to reach dp according to the test requirements, and the pressure alternation test is performed for X times without filling and discharging the container, the following conditions must be met:

[0018] 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.

[0019] Furthermore, when conducting the automatic temperature rise and exhaust control experiment, the temperature rise rate and the heating power of the electric heating element are Perform calculations; In the formula, Q represents the heating power of the electric heating element, c is the specific heat of the high-temperature surge tank under the pressure P, and m represents the mass of water in the high-temperature surge tank. is the adjustment factor; in The computer collects temperature and Q at regular intervals to form 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.

[0020] Furthermore, when the high-temperature pressure stabilization tank uses steam to stabilize pressure, it includes two processes: a) establishing a steam space; b) increasing temperature and pressure; For a) Establishing steam space: First, increase the pressure of the high temperature pressure regulating tank to 0.5MPa, then turn on the electric heating element, and follow the The solution controls the medium in the container to steadily increase its temperature, and then opens the exhaust valve at the top of the high-temperature pressure-stabilizing tank to exhaust and release pressure, so that a steam space is established at the top of the high-temperature pressure-stabilizing tank, and automatically monitors that the water level drops to the preset H1 value, and then the top exhaust valve; For b) temperature and pressure increase: turn on the electric heating element and follow the The scheme controls the medium in the container to increase the temperature and pressure. During the temperature increase process, the water level in the high-temperature pressure-stabilizing tank is automatically detected. If the water level is higher than H2, the drain valve is opened to drain water; if the water level is lower than H3, the water replenishment component is connected to the first air outlet pipe to spray water from the top of the high-temperature pressure-stabilizing tank. Among them, H1, H2, and H3 are calculated using the following method:

[0021] , ; In the formula, is the height of the high temperature surge tank container; The target water level is manually set according to the experimental requirements; is the density of the 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.

[0022] Furthermore, the gas replenishing component includes a pumping component, a gas main pipe and a plurality of gas branch pipes. The pumping component is connected to the gas main pipe for delivering gas to the gas main pipe. One end of the gas branch pipe is connected to the corresponding pressure stabilizing and expansion tank, and the other end is connected to the gas main pipe. In addition, each gas branch pipe is provided with an eighth valve for controlling the on-off of each gas branch pipe; the gas main pipe is provided with a ninth valve for controlling the on-off between the gas main pipe and each gas branch pipe.

[0023] Furthermore, the water replenishment assembly includes a water replenishment pipe and a water replenishment valve arranged on the water replenishment pipe; one end of the water replenishment pipe is connected to a pump or a pressurized water source, and the other end is connected to the interface module, and the water replenishment valve is used to control the on and off of the water replenishment pipe.

[0024] The beneficial effects of the present invention are embodied in: The present invention can carry out various test projects, and a set of systems can produce various test conditions. At the same time, a plurality of pressure-stabilizing and expansion tanks are connected in series or in parallel as pressure sources, which is economical and can be used in stages in daily life, and has a high utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a working principle diagram of the combined voltage stabilizing system suitable for valve reliability testing according to the present invention.

[0026] In the figure: 1. Interface module; 2. High-temperature pressure-stabilizing tank; 21. First water outlet pipe; 22. First air 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 expansion tank; 41. Second air outlet pipe; 42. Third air outlet pipe; 43. Fifth valve; 44. Sixth valve; 5. Pumping components; 51. Gas main pipe; 52. Gas branch pipe; 53. Eighth valve; 54. Ninth valve; 6. Water supply pipe; 61. Water supply valve. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0028] See also Figure 1 .

[0029] The present invention discloses a combined voltage stabilization system suitable for valve reliability testing, comprising: Interface module 1, used for connecting with the valve to be tested (in the specific test, it is an interface with a switch valve, or it can be an interface without a switch valve); A high-temperature pressure stabilizing tank 2 is provided with an electric heating element inside thereof, and 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, and 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. 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 on-off of the first water outlet pipe 21 and the first air outlet pipe 22; The low-temperature stabilizing tank 3 is filled with normal-temperature water. The water outlet at the bottom of the low-temperature stabilizing tank 3 is connected to the interface module 1 and the top of the high-temperature stabilizing tank 2 through the second water outlet pipe 31 and the third water outlet pipe 32, respectively. The second water outlet pipe 31 and the third water outlet pipe 32 are respectively provided with a third valve 33 and a fourth valve 34, 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, and the gas outlet of each pressure-stabilizing and expansion tank 4 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, for controlling the on-off of the second gas outlet pipe 41 and the third gas outlet pipe 42, wherein the gas pressure in at least one pressure-stabilizing and expansion tank 4 is greater than the gas pressure in the other pressure-stabilizing and expansion tanks 4; An air supply component, used to supply air to each pressure-stabilizing and expanding tank 4 respectively; 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.

[0030] In the specific implementation, when conducting a 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 replenish water into the high-temperature pressure-stabilizing tank 2, and multiple pressure-stabilizing and expansion tanks 4 are used to stabilize the pressure of the system; when conducting a saturated steam fluid blocking test, the air 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 replenish water into the high-temperature pressure-stabilizing tank 2, and multiple pressure-stabilizing and expansion 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 both high-temperature container tests and low-temperature container tests (when testing low-temperature containers, the electric heating elements can be turned off); at least one pressure-stabilizing and expansion tank 4 with a relatively large internal air pressure can be used to carry out pressure alternation tests, and can also be used to carry out separate test piece sealing tests and test pipeline pressure tests; at the same time, the low-temperature pressure-stabilizing tank 3 and each pressure-stabilizing and expansion tank 4 can be independently connected to the interface module 1 to carry out corresponding test items.

[0031] The present invention can carry out various test projects. A set of systems can produce various test conditions. At the same time, a plurality of pressure-stabilizing expansion tanks are used as pressure sources in a 4-series / parallel manner. The invention is economical and can be graded and used in daily life, and has a high utilization rate.

[0032] Preferably, the gas contained in each pressure-stabilizing and expansion tank 4 is an inert gas, and more preferably, the inert gas is nitrogen.

[0033] Preferably, a safety valve is provided on the top of each tank body to relieve excessive pressure in the tank body and avoid excessive pressure inside the tank body.

[0034] In one 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-regulating tank 3 and the top of the high-temperature pressure-regulating 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. This design can, on the one hand, increase the heating speed of the water in the high-temperature pressure-regulating tank 2 so that it quickly becomes saturated water. On the other hand, when carrying out the saturated steam test, it can avoid too fast a decrease in the temperature of the saturated steam and avoid a sudden decrease in the pressure in the high-temperature pressure-regulating tank 2 (when carrying out the saturated steam test, the pressure in the high-temperature pressure-regulating tank 2 comes from the steam pressure. Once the steam is cooled and condensed quickly, it is easy to make the pressure in the high-temperature pressure-regulating tank 2 unstable). At the same time, the preheater 36 is arranged between the seventh valve 35 and the fourth valve 34, and the third water outlet pipe 32 can be disconnected from the preheater 36 through the seventh valve 35 and the fourth valve 34, so that the preheater 36 can be easily inspected and maintained.

[0035] In one embodiment, 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.

[0036] In specific implementation, when the tested valve is being tested, if the tested valve cannot be closed, the direct result is that the system pressure will be lost rapidly; if the system pipeline is set up in the above manner, then because the equivalent area of ​​the tested valve is the smallest, the critical flow will first appear at the tested valve, and the appearance of the 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 cause critical flow to appear in the third air outlet pipe 42 and the third water outlet pipe 32 in turn, thereby slowing down the pressure loss rate of the container, which is helpful to find the corresponding valve on site and prevent the system from losing pressure.

[0037] For example, taking the saturated water fluid blocking test as an example, this system, as the source of spray water, continuously provides water and pressure head; this system can meet the maximum fluid blocking test under the conditions of 17MPa, 350℃, and 10% opening of DN800 valve; There are 4 pressure stabilizing and expansion 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 are used as pressure stabilizing gas sources to provide a sufficiently large cold gas space, and the low-temperature pressure stabilizing tank 3 is used as a water supplement source to supplement the saturated water discharged from the high-temperature pressure stabilizing tank 2. The high-temperature pressure stabilizing tank 2 is used as a saturated water generation and discharge device, wherein: The volume of high temperature surge tank 2 is 6m³, the design temperature is 400℃, and the design pressure is 20MPa; The volume of low temperature surge tank 3 is 6m³, the design temperature is 200℃, and the design pressure is 20MPa; The volume of v4 is 5m³, the design temperature is 150℃, and the design pressure is 20MPa; The volume of v3 is 3m³, the design temperature is 150℃, and the design pressure is 20MPa; The volume of v2 is 1m³, the design temperature is 150℃, and the design pressure is 20MPa; V1 has a volume of 0.5m³, a design temperature of 150°C, and a design pressure of 40MPa; The connecting pipe of V1-V2-V3-V4 is DN50, the pipe connecting low temperature pressure stabilizing tank 3 to high temperature pressure stabilizing tank 2 is DN200, and the pipe of high temperature pressure stabilizing tank 2 is DN300; In actual use, the pressure requirement before the test is p, and the corresponding density of saturated water is , the mass of saturated water discharged during the test is , the pressure difference before and after the test is required to be dpMPa, so the gas space before the experiment is required to be The budget needs to be made as follows:

[0038] During the test, according to Values ​​to arrange different containers, such as: when + When the volume is less than 3m³, only the high-temperature pressure-surge tank 2 is used. There is an electric heating element at the bottom of the high-temperature pressure-surge 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-surge tank 2. Therefore, when the high-temperature pressure-surge tank 2 is not full of water, the effective discharge volume is only 50%, that is, 3m³.

[0039] when + When the volume is less than 9m³, only low-temperature surge tank 3 and high-temperature surge tank 2 containers can be used; when + When the volume is >9m³, one or all of V1\V2\V3\V4 can be selected for combination according to the specific value.

[0040] The mass of saturated water discharged during the test is Estimate according to the following formula:

[0041] Where: A is the equivalent flow area of ​​the valve opening being measured, unit: m 2 ; is the valve action time, unit is s; P is the pressure inside the high temperature surge tank, unit: MPa.

[0042] In one embodiment, the gas replenishment assembly includes a pumping component 5, a gas main pipe 51 and a plurality of gas branch pipes 52. The pumping component 5 is connected to the gas main pipe 51 and is used to deliver gas to the gas main pipe 51. One end of the gas branch pipe 52 is connected to the corresponding pressure-stabilizing and expansion tank 4, and the other end is connected to the gas main pipe 51. In addition, each gas 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 branch pipe 52; the gas 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 main pipe 51 and each gas branch pipe 52. With this design, gas replenishment can be performed according to the characteristics of each pressure-expansion tank.

[0043] Preferably, it also includes a gas storage tank, which is used to store inert gas, and 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 an air compressor, a vacuum pump or other components in the prior art.

[0044] In one embodiment, the water replenishment assembly includes a water replenishment pipe 6 and a water replenishment valve 61 disposed on the water replenishment pipe 6; one end of the water replenishment pipe 6 is connected to a pump or a water source with pressure, and the other end is connected to the interface module 1, and the water replenishment valve 61 is used to control the on-off of the water replenishment pipe 6. With this design, since the water outlets at the bottom of the low-temperature and high-temperature pressure stabilizing tanks 3 and 2 are connected to the interface module 1 through a pipeline, water can be replenished into the low-temperature and high-temperature pressure stabilizing tanks 3 and 2 through the pipeline when replenishing water, and there is no need to set up a separate water replenishment pipe 6, making the overall pipeline more concise.

[0045] In one embodiment, when conducting a saturated steam flow blocking test, the system serves as a source of blowdown steam, continuously providing steam and pressure head: The pressure stabilizing system can meet the fluid blocking test under the conditions of 17MPa, 350℃ and 10% opening of DN800 valve.

[0046] 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 discharged from the high-temperature pressure-stabilizing tank 2. The high-temperature pressure-stabilizing tank 2 serves as a saturated water generating and discharging device, and is connected to the fluid blocking test section through the first air outlet pipe 22 and the interface module 1.

[0047] In actual use, the pressure requirement before the test is P, and the corresponding density of saturated water is , the mass of saturated water discharged during the test is , the pressure difference before and after the test is required to be dpMPa, so the gas space before the experiment is required to be The budget needs to be made as follows:

[0048] During the test, Values ​​to arrange different containers, such as: when + When the volume is less than 3m³, only the high-temperature pressure-surge tank 2 container is used. There is an electric heating element at the bottom of the high-temperature pressure-surge 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-surge tank 2. Therefore, when the high-temperature pressure-surge tank 2 is not full of water, the effective discharge volume is only 50%, that is, 3m³.

[0049] when + When the volume is less than 9m³, only low-temperature and high-temperature surge tanks can be used; when + When the volume is >9m³, one or all of V1, V2, V3, and V4 can be selected for combination according to the specific value.

[0050] The mass of saturated water discharged during the test is Estimate according to the following formula:

[0051] A is the equivalent hydraulic area of ​​the valve opening being measured, in m 2 ; is the density of high temperature saturated steam; is the valve action time, unit is s; P is the pressure inside the high temperature surge tank, unit is MPa.

[0052] In one embodiment, when conducting a pressure alternation test, the system acts as a pressure source to provide different pressures to the test section: During the test, different pressure transmissions are achieved through the switch interface module 1. Before conducting the test, different container tank combinations must be selected according to the test section and the volume of the valve being tested. The selection must comply with the following formula:

[0053] in: 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.

[0054] The above is the formula for the double pressure alternating test, which can be extended to multiple pressure alternating test situations, depending on the test requirements. Select the appropriate container and the corresponding container gas space requirements. The container combination selected according to the formula can meet the requirements of at least 50 pressure alternating tests, and the pressure drop of the high-pressure container is controlled within 0.5MPa, and the pressure rise of the low-pressure container is controlled within 0.5MPa.

[0055] If the pressure change control requirement needs to reach dp according to the test requirements, and the pressure alternation test is performed X times without filling or discharging the container, the following conditions need to be met:

[0056] In one embodiment, when testing automatic temperature rise and exhaust control: For V1-V4 and low-temperature pressure-stabilizing tank 3 containers, they are mainly used in non-heating conditions, so nitrogen is filled through the gas replenishing component, and water is replenished and drained from the bottom of the container.

[0057] High temperature surge tank 2 can be used for high temperature container test and low temperature container test. The method for low temperature container test is the same as that for V1-V4 and low temperature surge tank 3. There are two usage scenarios for high temperature container test: 1) using nitrogen pressure stabilization, including connecting other containers as nitrogen pressure stabilization source; 2) using saturated water vapor pressure stabilization.

[0058] For the high-temperature pressure stabilizing tank 2, nitrogen is used for pressure stabilization. The medium is heated by the electric heating element at the bottom of the container. At this time, the pressure is adjusted by charging 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 of the high-temperature surge tank under the pressure P, and m represents the mass of water in the high-temperature surge tank. is the adjustment factor, It is automatically calculated by the computer during each test to compensate for the influence of nitrogen temperature rise. The computer collects a temperature and Q every 2 seconds. In the case of a small temperature difference, the influence of temperature on the change of water specific heat can be ignored, and an array is obtained. ,according to Perform the least squares fitting and get a value, and then adjust the output power of the electric heating element each time, and finally achieve stable temperature rise of the stabilizer medium.

[0059] For the high-temperature pressure stabilizing tank using steam pressure stabilization, V1-V4 and the low-temperature pressure stabilizing tank container are isolated from the high-temperature pressure stabilizing tank, and the high-temperature pressure stabilizing tank temperature is automatically controlled. There are two processes here: a) establishing steam space; b) increasing temperature and pressure; To establish the steam space, the computer first controls the water replenishment component to increase the pressure of the high temperature pressure regulating tank to 0.5MPa, and then turns on the electric heating element. The scheme controls the medium in the container to steadily increase in temperature (0.5MPa corresponds to the saturated water temperature of -5°C), where Q represents the heating power of the electric heating element, c is the specific heat of the high-temperature surge tank under the pressure P, and m represents the mass of steam and water in the high-temperature surge tank. is the adjustment factor, It 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 seconds. In the case of small temperature difference, the influence of temperature on the change of water specific heat can be ignored, and an array is obtained. ,according to Perform the least squares fitting and get a value, and then adjust the output power of each electric heating element, and then slightly open the safety valve (also called exhaust valve) on the top of the high-temperature pressure-stabilizing tank to exhaust and release pressure, so that the steam space is slowly built up on the top of the high-temperature pressure-stabilizing tank. After the computer automatically monitors the water level to drop to the preset H1 value, close the top exhaust valve; Then turn on the heating element and follow the The scheme controls the medium in the container to increase temperature and pressure, where Q represents the heating power of the electric heating element, c is the specific heat of the high-temperature surge tank under the pressure P, and m represents the mass of steam and water in the high-temperature surge tank. is the adjustment factor, It 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 seconds. In the case of small temperature difference, the influence of temperature on the change of water specific heat can be ignored, and an array is obtained. ,according to Perform the least squares fitting and get a 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, the water replenishment component is connected to the first air outlet pipe, and water is sprayed from the top of the high-temperature pressure-stabilizing tank (because there is less water in the tank and the temperature is high at this time, spraying water can quickly cool down the temperature in the tank while replenishing water).

[0060] About the computer automatic calculation method of H1, H2 and H3: The height of the high temperature surge tank container is , when conducting the test, a target water level needs to be set manually , which is determined according to the test requirements (that is, the water level that needs to be controlled), then: , .

[0061] About the calculation method of H1

[0062] In the formula, is the density of the 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; According to the actual situation of repeated temperature rise and fall of the container, the least squares fitting is performed, different high-temperature pressure stabilizing tank designs, and different insulation measures are used. The values ​​are different.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

[0064] It should be noted that if the embodiments of the present invention involve directional indications (such as up and down), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0065] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0066] In addition, "plurality" 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 replenishment 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 is 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 the saturated water fluid blocking test, the required gas space before the test is calculated 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 discharging 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 the 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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