Pit penetration piece test method and system, electronic equipment and storage medium

Abstract

The invention provides a pit penetration piece test method and system, electronic equipment and a storage medium, and relates to the technical field of industrial control, and the pit penetration piece test method comprises the following steps: obtaining the forward sealing specific pressure of a test medium when the test medium passes through a to-be-verified stop valve according to a set forward flowing direction, the reverse sealing specific pressure is obtained when the check valve passes through the check valve to be verified according to the reverse flowing direction; and performing equivalent detection on a forward pressurizing result and a reverse pressurizing result of the to-be-verified stop valve based on the forward sealing specific pressure, the reverse sealing specific pressure and the test medium pressure of the test medium. According to the test method and system, the electronic equipment and the storage medium provided by the invention, when the test purpose is more easily achieved by reverse pressurizing under certain working conditions, the reverse pressurizing can be directly utilized to carry out a sealing test to replace the original forward pressurizing treatment; therefore, a reverse sealing performance test result can be equivalent to a forward sealing performance test result, and the purpose of reducing manpower and the construction period is achieved.

Description

Technical Field

[0001] The present invention relates to the field of industrial control technology, and in particular to a pit penetration testing method, system, electronic equipment and storage medium. Background Art

[0002] When a serious accident occurs in a nuclear power plant reactor, a large amount of radioactive materials will be released. The reactor containment is the last safety barrier of nuclear power, which can prevent radioactive materials from being released into the air. As an important part of the containment sealing barrier, the containment isolation valve will affect the integrity of the containment and the safe operation of the system. Therefore, it is very important to carry out the containment isolation valve sealing test (C type test) during the commissioning and operation of the nuclear power unit. The containment C type test is to test whether the sealing function of the containment isolation valve can meet the design requirements under accident conditions and keep its leakage rate within the required range to ensure that the radioactive materials produced by the nuclear power plant do not leak under any circumstances. In order to achieve this goal, the containment isolation valve is subjected to a sealing test. The test verifies the sealing of all mechanical penetration isolation valves located on both sides of the containment. During the test, the system needs to be pressurized to the design pressure of 0.42MPa (absolute pressure). The conventional test method adds additional openings, has more isolation boundaries, and increases the probability of accidents. In practical applications, the conventional method has the situation that the isolation boundary range required by the tested valve is large or the isolation boundary is difficult to set. When arranging the window of each test, the occupancy of each boundary valve by other test items should be considered simultaneously.

[0003] In the existing nuclear power unit pit penetration test of the isolation valve, the sealing test can only be performed on one end of the isolation valve. If the test on one end is difficult, it is unknown whether the other end can be tested in the same way, which increases the difficulty of detecting the leakage rate of the isolation valve. For example, the penetration of the 2 sets of EHR (containment heat removal system) system of the pit water pool of the internal refueling water tank (IRWST) of the containment needs to be pressurized by installing a blind flange with a pressure charging interface in the pit during the test. This requires that all the water in the pool be drained before the test, which is difficult to implement and requires a lot of manpower and construction time. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the object of the present invention is to provide a pit penetration test method, system, electronic equipment and storage medium for solving the problem that in the prior art, the sealing test of the isolation valve of the pit penetration of the nuclear power unit can only be carried out through one end of the isolation valve. If the test on one end is difficult, it is unknown whether the other end can be tested in the same way, which increases the difficulty of detecting the leakage rate of the isolation valve.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a pit penetration testing method, comprising the following steps: obtaining a forward sealing pressure ratio when a test medium passes through a stop valve to be verified in a set forward flow direction, and a reverse sealing pressure ratio when a test medium passes through the stop valve to be verified in a reverse flow direction; performing equivalent detection of a forward pressurization result and a reverse pressurization result of the stop valve to be verified based on the forward sealing pressure ratio, the reverse sealing pressure ratio and the test medium pressure of the test medium; when the forward pressurization result and the reverse pressurization result are equivalent, performing a sealing test on the stop valve to be verified according to the reverse pressurization operation corresponding to the reverse pressurization result.

[0006] In one embodiment of the present invention, the forward sealing pressure ratio when the test medium passes through the stop valve to be verified in the set forward flow direction, and the reverse sealing pressure ratio when the test medium passes through the stop valve to be verified in the reverse flow direction are obtained, including: forward pressurizing the test medium through the valve sealing surface of the electric stop valve to be verified in the forward flow direction to obtain the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism during the forward punching process; reverse pressurizing the test medium through the valve sealing surface of the electric stop valve to be verified in the reverse flow direction to obtain the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism during the reverse punching process; calculating the forward sealing pressure ratio according to the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism during the forward punching process; calculating the reverse sealing pressure ratio according to the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism during the reverse punching process.

[0007] In one embodiment of the present invention, the forward seal specific pressure is calculated as follows: The calculation formula for reverse seal specific pressure is: Among them, P 正 is the positive seal specific pressure, P 反 is the reverse seal specific pressure, F 关1 The valve stem thrust provided to the drive mechanism during the forward stamping process, F SP1 is the friction resistance of the filler during the forward stamping process, F b1 is the bellows load during the forward punching process, F t1 The additional sealing force during the positive punching test, F 关2 The valve stem thrust provided to the drive mechanism during the reverse punching process, F SP2 is the friction resistance of the filler during the reverse punching process, F b2 is the bellows load during the reverse punching process, F t2 It is the additional sealing force of the test during the reverse punching process, and S is the sealing area.

[0008] In one embodiment of the present invention, based on the forward sealing pressure ratio, the reverse sealing pressure ratio and the test medium pressure of the test medium, an equivalent detection of the forward pressurization result and the reverse pressurization result of the stop valve to be verified is performed, including: under the test medium pressure, whether one of the following two conditions is met: the difference between the forward sealing pressure ratio and the reverse sealing pressure ratio is less than a preset value; the difference between the forward sealing pressure ratio and the reverse sealing pressure ratio is greater than a preset value, the forward sealing pressure ratio is greater than an effective sealing setting value, and the reverse sealing pressure ratio is greater than an effective sealing setting value; if so, it is determined that the forward pressurization result and the reverse pressurization result are equivalent, if not, it is determined that the forward pressurization result and the reverse pressurization result are not equivalent.

[0009] In one embodiment of the present invention, a sealing test of the stop valve to be verified is performed according to a reverse pressurization operation corresponding to the reverse pressurization result, including: switching the test medium from a forward pressurization operation of the stop valve to be verified to a reverse pressurization operation of the stop valve to be verified, and obtaining the leakage rate when the reverse pressurization operation is performed on the stop valve to be verified.

[0010] In one embodiment of the present invention, the reverse pressurization operation of the stop valve to be verified includes: reverse pressurizing the test medium under the test medium pressure to the downstream of the stop valve to be verified according to the flow replenishment method, and monitoring the leakage rate downstream of the reverse pressurization of the stop valve to be verified.

[0011] The present invention also provides a pit penetration testing system, comprising: a sealing pressure ratio acquisition unit, used to obtain the forward sealing pressure ratio when the test medium passes through the stop valve to be verified in a set forward flow direction, and the reverse sealing pressure ratio when the test medium passes through the stop valve to be verified in a reverse flow direction; an equivalent detection unit, used to perform equivalent detection of the forward pressurization result and the reverse pressurization result of the stop valve to be verified based on the forward sealing pressure ratio, the reverse sealing pressure ratio and the test medium pressure of the test medium; and a sealing test unit, used to perform a sealing test on the stop valve to be verified according to the reverse pressurization operation corresponding to the reverse pressurization result when the forward pressurization result and the reverse pressurization result are equivalent.

[0012] In one embodiment of the present invention, the sealing test unit includes: a charging control module, which is used to control the charging device to pressurize the test medium into the stop valve to be verified with the test medium pressure; and a leakage monitoring module, which is used to obtain the leakage rate of the stop valve to be verified when it is pressurized in the reverse direction of the stop valve to be verified, monitored by a flow meter group installed between the downstream of the charging device and the reverse charging end of the stop valve to be verified.

[0013] The present invention further provides an electronic device, which includes: one or more processors; a storage device for storing one or more programs, and when the one or more programs are executed by the one or more processors, the electronic device implements the aforementioned pit penetration test system method.

[0014] The present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor of a computer, the computer is caused to execute the aforementioned pit penetration test system method.

[0015] As described above, a pit penetration test method, system, electronic device and storage medium of the present invention have the following beneficial effects: by calculating the forward sealing pressure ratio during forward pressurization and calculating the reverse sealing pressure ratio during reverse pressurization, the equivalence of the forward pressurization result and the reverse pressurization result can be further judged according to the experimental medium pressure during forward or reverse pressurization. When the two are equivalent, it can be achieved that when reverse pressurization is easier to achieve the test purpose under certain working conditions, the reverse pressurization can be directly used to perform a sealing test to replace the original forward pressurization process, so that the reverse sealing test result can be equivalent to the forward sealing test result, so as to achieve the purpose of reducing manpower and construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic flow chart of a pit penetration testing method provided in an embodiment of the present invention.

[0017] Figure 2 Shown is a structural schematic diagram of a sealing test of an electric stop valve (EHR1101VP) provided in one embodiment of the present invention.

[0018] Figure 3 Shown is a schematic structural diagram of an electric stop valve (EHR1101VP) provided in one embodiment of the present invention.

[0019] Figure 4 A broken line diagram showing the corresponding relationship between leakage rate and sealing load provided in an embodiment of the present invention.

[0020] Figure 5 Shown is a structural block diagram of a test system provided by an embodiment of the present invention.

[0021] Figure 6 Shown is a structural schematic diagram of an electronic device according to an embodiment of the present invention.

[0022] Component number description

[0023] Electronic device 1; test system 11; including memory 12; processor 13; sealing pressure ratio acquisition unit 111; equivalent detection unit 112; sealing test unit 113; bellows 1a; valve stem 2a; valve stem nut 3a; packing 4a; driving mechanism 5a. DETAILED DESCRIPTION

[0024] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0025] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0026] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0027] See also Figure 1 In one embodiment of the present invention, the present invention provides a pit penetration testing method, comprising the following steps:

[0028] Step S10: Obtain the forward sealing specific pressure when the test medium passes through the stop valve to be verified in the set forward flow direction, and the reverse sealing specific pressure when the test medium passes through the stop valve to be verified in the reverse flow direction.

[0029] Step S20: Based on the forward sealing specific pressure, the reverse sealing specific pressure and the test medium pressure of the test medium, an equivalent test of the forward pressurization result and the reverse pressurization result of the stop valve to be verified is performed.

[0030] Step S30: When the forward pressure charging result and the reverse pressure charging result are equivalent, a sealing test of the stop valve to be verified is performed according to the reverse pressure charging operation corresponding to the reverse pressure charging result.

[0031] In this embodiment, through step S10: obtaining the forward sealing pressure ratio when the test medium passes through the stop valve to be verified in the set forward flow direction, and the reverse sealing pressure ratio when the test medium passes through the stop valve to be verified in the reverse flow direction, it can be seen that during the commissioning and operation of the nuclear power unit, the containment isolation valve sealing test (C-type test) is very important. The containment isolation valve is often a stop valve. The containment C-type test is to test whether the sealing function of the containment isolation valve can meet the design requirements under accident conditions and keep its leakage rate within the required range to ensure that the radioactive materials produced by the nuclear power plant do not leak under any circumstances. In the sealing test process, first, according to the test medium passing through the stop valve to be verified in the set forward flow direction, the forward sealing pressure ratio in this state is determined according to the forward flow direction on the forward pressurized sealing force of the stop valve to be verified and the corresponding sealing area. Similarly, it is also necessary to measure the reverse sealing pressure ratio when the test medium passes through the stop valve to be verified in the reverse flow direction. Specifically, the test medium can be a gas, such as air or an inert gas. The forward flow direction and the reverse flow direction in the present invention are two medium flow directions that are opposite to each other. Through the above steps, it is possible to determine the sealing pressure ratio of the stop valve to be verified in the positive and negative directions (i.e., upstream or downstream of the stop valve to be verified) respectively according to the different flow directions of the test medium, so as to further determine whether equivalence can be achieved based on the determined forward sealing pressure ratio and reverse sealing pressure ratio, so as to achieve the purpose of equivalent leakage rate detection by replacing the original forward pressurization method with reverse pressurization.

[0032] Through step S20: based on the forward sealing pressure ratio, the reverse sealing pressure ratio and the test medium pressure of the test medium, the equivalent detection of the forward charging result and the reverse charging result of the stop valve to be verified is performed. It can be seen that when the test medium is passed through the stop valve to be verified in the forward and reverse directions, the forward sealing pressure ratio and the reverse sealing pressure ratio can be determined. In addition, when the test medium is filled into the stop valve to be verified, the test medium also has a certain test medium pressure, and the test medium pressure will form a forward and reverse additional sealing force on the stop valve to be verified when the test medium is passed into the stop valve to be verified in the forward or reverse direction. After obtaining the forward sealing pressure ratio, the reverse sealing pressure ratio and the test medium pressure of the test medium, it can be further judged whether the forward charging result and the reverse charging result of the stop valve to be verified are equivalent according to the relationship between the forward sealing pressure ratio, the reverse sealing pressure ratio and the test medium pressure of the test medium. If it is possible, it means that when forward charging is inconvenient, the forward charging operation can be replaced by reverse charging of the stop valve to be verified; if it is not possible, it means that reverse charging cannot replace forward charging. Through the above method, the effectiveness of reverse charging of the stop valve to be verified can be determined more accurately.

[0033] Through step S30: when the forward pressure charging result and the reverse pressure charging result are equivalent, the sealing test of the stop valve to be verified is performed according to the reverse pressure charging operation corresponding to the reverse pressure charging result. It can be seen that when determining that the forward pressure charging result and the reverse pressure charging result are equivalent, if there is a certain inconvenience in forward pressure charging, the reverse pressure charging result obtained by reverse pressure charging can be accurately and reasonably equivalent to the forward pressure charging result by performing a sealing test on the stop valve to be verified by using the reverse pressure charging operation corresponding to the reverse pressure charging result. Through the above steps, it can be achieved that when it is easier to complete the test in reverse under certain working conditions, the reverse pressure charging operation can be performed according to the determined reverse pressure charging result being equivalent to the forward pressure charging result, so as to achieve the purpose of reducing manpower and construction period.

[0034] See also Figure 2 Specifically, in the 2-group EHR system of the pit water pool of the in-containment refueling water tank (IRWST), the starting point of the pit penetration inside the containment is the IRWST, which is located at the bottom layer inside the containment and is a concrete structure with a stainless steel lining, which is part of the reactor building structure. The outside is the isolation valve located in the safety building, which needs to be tested for sealing, and the water in the pool must be completely drained before the test, and then the test upstream of the pit penetration is carried out, that is, the pressurizing device is installed from the IRWST pit water pool upstream of the pit penetration to perform a positive pressurizing test on the electric stop valve (EHR1101VP-) downstream of the pit penetration.

[0035] Therefore, based on the inconvenience of the above-mentioned forward pressurization, the present invention also provides a reverse pressurization method. In the isolation valve located in the safety workshop outside the containment, specifically includes: an electric stop valve (EHR1101VP-) installed downstream of the pit penetration; an electric stop valve (EHR1107VP-) is installed on the downstream main line of the electric stop valve (EHR1101VP-); two branch lines are also connected to the main line between the electric stop valve (EHR1101VP-) and the electric stop valve (EHR1107VP-), one of which is equipped with an electric stop valve (RIS41 40VP-); a manual stop valve (EHR1102VP-) and a manual stop valve (EHR1710VP-) are installed in sequence on the other pipeline; two pipelines are also provided downstream of the pit penetration, and a manual stop valve (RIS4190VP-) and a manual stop valve (RIS4121VA-) are installed respectively, and a manual stop valve (RIS4112MPA) and a manual stop valve (RIS4113MPA) are also connected in parallel downstream of the manual stop valve (RIS4121VA-). When determining that forward pressurization upstream of the electric stop valve (EHR1101VP) and reverse pressurization downstream of the electric stop valve (EHR1101VP) are equivalent, it is obvious that the reverse pressurization test is easier to complete. Therefore, the sealing test of the electric stop valve (EHR1101VP) can be achieved by reverse pressurization.

[0036] When conducting a sealing test for reverse pressure charging, first verify the initial states of the test valves, including the electric stop valve (EHR1101VP-), electric stop valve (EHR1107VP-), electric stop valve (RIS4140VP-), manual stop valve (EHR1102VP-), manual stop valve (EHR1710VP-), manual stop valve (RIS4190VP-), manual stop valve (RIS4121VA-), manual stop valve (RIS4112MPA) and manual stop valve (RIS4113MPA), then measure the environmental dose around the penetration, and place the test equipment in a low-radiation area. When reversely charging the electric stop valve (EHR1101VP-), connect the flow meter group to the downstream of the manual stop valve (EHR1710VP-), and open the manual stop valve (EHR1710VP-) and the manual stop valve (EHR1102VP-) at the same time. Then connect the charging device to the flow meter group and charge to 4.2bar.g, that is, conduct a reverse charging test on the electric stop valve (EHR1101VP-) by the flow supplement method. After the flow meter group stabilizes for a period of time, read the test data and check the curve to record the results. If the reverse charging result is normal, it means that the forward charging result is normal, that is, the site can be restored, the system pressure can be relieved, and then the status of other valves can be determined. After all valve status tests are completed, the test ends.

[0037] In one embodiment of the present invention, in the process of obtaining the forward sealing pressure ratio and the reverse sealing pressure ratio, it is also necessary to further analyze the various related factors that affect the sealing pressure ratio. Specifically, the forward sealing pressure ratio when the test medium passes through the stop valve to be verified in the set forward flow direction, and the reverse sealing pressure ratio when the test medium passes through the stop valve to be verified in the reverse flow direction, are obtained, including: forward pressurizing the test medium through the valve sealing surface of the electric stop valve to be verified in the forward flow direction to obtain the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism during the forward punching process; reverse pressurizing the test medium through the valve sealing surface of the electric stop valve to be verified in the reverse flow direction to obtain the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism during the reverse punching process; calculating the forward sealing pressure ratio according to the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism during the forward punching process; calculating the reverse sealing pressure ratio according to the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism during the reverse punching process.

[0038] In this embodiment, when obtaining the forward sealing pressure ratio, it is necessary to firstly perform forward pressurization on the electric stop valve to be verified with the test medium, so as to determine the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism of the electric stop valve under the forward pressurization state, and then further determine the corresponding forward sealing pressure ratio under the forward pressurization state according to the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism. Similarly, when obtaining the reverse sealing pressure ratio, it is necessary to first perform reverse pressurization on the electric stop valve to be verified with the test medium, so as to determine the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism of the electric stop valve under the reverse pressurization state, and then further determine the corresponding reverse sealing pressure ratio under the reverse pressurization state according to the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism. Since the pressure test medium provides different directions to the upstream and downstream of the electric stop valve to be verified during forward and reverse pressure charging, the valve stem thrust provided by the drive mechanism may be different. Other factors such as packing friction resistance, test additional sealing force and bellows load can be the same or different.

[0039] In one embodiment of the present invention, the calculation formula for the positive seal specific pressure is: The calculation formula for reverse seal specific pressure is: Among them, P 正 is the positive seal specific pressure, P反 is the reverse seal specific pressure, F 关1 The valve stem thrust provided to the drive mechanism during the forward stamping process, F SP1 is the friction resistance of the filler during the forward stamping process, F b1 is the bellows load during the forward punching process, F t1 The additional sealing force during the positive punching test, F 关2 The valve stem thrust provided to the drive mechanism during the reverse punching process, F SP2 is the friction resistance of the filler during the reverse punching process, F b2 is the bellows load during the reverse punching process, F t2 It is the additional sealing force of the test during the reverse punching process, and S is the sealing area.

[0040] See also Figure 3 In a preferred embodiment, the electric stop valve to be verified includes a bellows 1a, a valve stem 2a, a valve stem nut 3a, a packing 4a and a driving mechanism (motor) 5a, wherein the upstream inner diameter of the electric stop valve to be verified is d1, the downstream inner diameter of the electric stop valve to be verified is d2, and the distance from the central axis of the upstream inner diameter of the electric stop valve to its downstream end surface is d3. Specifically, when calculating the thrust F of the valve stem 2a provided by the driving mechanism 5a during forward charging or reverse charging, 关 When , the calculation formula is: Where, M is the output torque of the drive mechanism 5a (calculated according to the rated torque of the electrical equipment), S F Is the thread conversion factor. Thread conversion factor Among them, β is half of the trapezoidal thread profile angle, and μ2 is the friction coefficient of the valve stem nut 3a. Among them, tanα refers to the thread lead angle, d=d0-(0.6495×P p ), d refers to the thread diameter, d0 is the thread outer diameter, P p is the thread pitch, and 06495 is the standard tolerance (fixed value). Bellows 1a is a tubular elastic element used to convert pressure into displacement, similar to a spring. It is installed around the valve stem and can be used to alleviate pressure fluctuations and protect the valve stem from damage or corrosion. Bellows are involved in most valve installations. Calculation of bellows 1a load F during forward or reverse pressure charging b When F b = k × h, where k is the bellows stiffness and h is the valve stroke. When calculating the friction resistance F of the packing 4a during positive or reverse pressure charging SP When F SP=12×π×D0×H, where D0 is the valve stem diameter and H is the packing height. In this embodiment, the packing refers to the packing 4a, which acts as an external seal. When the valve stem moves up and down, it will rub against the packing 4a, so it is necessary to calculate the friction effect of the packing 4a. The packing height is the length of the surface where the packing 4a contacts the valve stem, and then the friction is calculated after calculating the contact area. When calculating the test additional sealing force F during positive or reverse pressure charging t When , the calculation formula is: Among them, P t is the test pressure, D1 is the inner diameter of the valve disc. Sealing area Among them, D2 and D3 are the valve disc diameters respectively. In summary, it can be calculated that the positive pressure sealing force F during positive pressure charging is s1 =F 关1 -F sp1 -F b1 -F t1 , reverse pressure sealing force F during reverse pressure s2 =F 关2 -F sp2 -F b2 -F t2 Then we can get the positive seal pressure ratio and reverse seal pressure

[0041] In a preferred embodiment of the present invention, when P p =6.35mm, d0=44.45mm, μ2=0.1, β=15°, When M = 1000 N·m, When k = 12.1 N / mm, h = 103 mm, F b = k × h = 1246 N. When D0 = 4.6 cm, H = D0 + 1.5 = 6.1 cm, F SP =12×π×D0×H=10573N. t =4.2bar, D1=314mm, Therefore, the positive pressure sealing force F is obtained. s1 =F 关1 -F sp1 -F b1 -F t1 =272330N, reverse pressure sealing force F s2 =F 关2 -F sp2 -F b2 -F t2 =337344N. When D2, that is, D0 = 314mm, D3 = 324mm, Then we can further get the positive seal pressure ratio Reverse seal specific pressure The above sealing force calculation results show that, in the valve electrically closed state (output torque 1000N·m), the sealing pressure ratio of reverse pressure filling is greater than that of forward pressure filling, but the sealing pressure ratio of forward and reverse pressure filling exceeds 30MPa. According to the grinding process and roughness of the valve sealing surface, an effective seal can be formed when the sealing pressure ratio exceeds 30MPa.

[0042] In one embodiment of the present invention, when it is determined that reverse pressurization can be used to replace forward pressurization, it is also necessary to further determine whether the forward pressurization result and the reverse pressurization result of the stop valve to be verified are equivalent. Specifically, based on the forward sealing pressure ratio, the reverse sealing pressure ratio and the test medium pressure of the test medium, an equivalent detection of the forward pressurization result and the reverse pressurization result of the stop valve to be verified is performed, including: under the test medium pressure, whether one of the following two conditions is met: the difference between the forward sealing pressure ratio and the reverse sealing pressure ratio is less than the preset value; the difference between the forward sealing pressure ratio and the reverse sealing pressure ratio is greater than the preset value, the forward sealing pressure ratio is greater than the effective sealing setting value, and the reverse sealing pressure ratio is greater than the effective sealing setting value; if so, it is determined that the forward pressurization result and the reverse pressurization result are equivalent, if not, it is determined that the forward pressurization result and the reverse pressurization result are not equivalent.

[0043] The test medium pressure is a pressure that simulates an accident condition. For example, when the pressure in the containment under an accident condition is 4.2 bar.g, the test medium pressure can be set to 4.2 bar.g during the test. Specifically, the test medium pressure can be fixed between 4.2 bar.g and 4.6 bar.g.

[0044] In this embodiment, the effective sealing setting value is a sealing pressure ratio value that is well known in the industry and can achieve the purpose of effective sealing, and the fitting curve of the corresponding relationship between the leakage rate of the plane sealing valve and the actual sealing load is calculated, and the leakage law is basically consistent with the industry theory. When the test medium pressure is fixed to 4.2 bar.g, for example, when the equivalent detection of the forward charging result and the reverse charging result of the stop valve to be verified is performed, there are two situations. The first is that the difference between the forward sealing pressure ratio and the reverse sealing pressure ratio is less than the preset value, and the preset value can be designed to be relatively small according to the test needs to ensure that the forward charging result and the reverse charging result can be directly determined to be equivalent when the values ​​between the forward sealing pressure ratio and the reverse sealing pressure ratio are relatively close. The second is that the difference between the forward sealing pressure ratio and the reverse sealing pressure ratio is greater than the preset value. In this case, it is also necessary to further determine whether the forward charging result and the reverse charging result of the stop valve to be verified are equivalent based on the size relationship between the forward sealing pressure ratio and the effective sealing setting value, and the size relationship between the reverse sealing pressure ratio and the effective sealing setting value. Specifically, only when both the forward sealing pressure ratio is greater than the effective sealing set value and the reverse sealing pressure ratio is greater than the effective sealing set value are satisfied can it be determined that the forward charging result and the reverse charging result are equivalent.

[0045] See also Figure 4 In the leakage rate and sealing load correspondence diagram, other conditions are the same, only the sealing load is different. The blue broken line is the test leakage rate of valve disc A, the red broken line is the test leakage rate of valve disc B, and the yellow broken line is the calculated leakage rate. As the test pressure increases, the leakage rate continues to decrease, and the sealing load is the smallest when the test pressure is 3bar.g, which is converted into a sealing pressure of 30MPa, which is the effective sealing setting value for forming an effective seal. Under this sealing pressure, increasing the sealing pressure ratio has little effect on the sealing performance. When the sealing pressure ratio exceeds 30MPa during forward and reverse pressure charging, if the test medium pressure under the test condition is 0.42MPa, because the forward and reverse pressure charging has little effect on the test results, the forward and reverse pressure charging results of the stop valve to be verified, such as the EHR1101VP manual stop valve, can be equivalent. It is worth noting that the basic function of the containment is to ensure good radiation protection for the environment and prevent the release of fission products outside the plant under all operating conditions, whether normal or accident conditions (including LOCA (Loss of Coolant Acciden) conditions). The test condition is to simulate the operating pressure of 4.2 bar when a primary circuit leak occurs in a nuclear power plant, and verify whether the containment isolation valve is reliable at a pressure of 4.2 bar.

[0046] In one embodiment of the present invention, after determining that the forward pressurization result and the reverse pressurization result are equivalent, the forward pressurization operation with limited operation can be replaced by the reverse pressurization operation. Specifically, the sealing test of the stop valve to be verified is performed according to the reverse pressurization operation corresponding to the reverse pressurization result, including: switching the forward pressurization operation of the stop valve to be verified by the test medium to the reverse pressurization operation of the stop valve to be verified, and obtaining the leakage rate when the reverse pressurization operation is performed on the stop valve to be verified.

[0047] In this embodiment, when performing a reverse pressurization operation, the test medium, such as gas, can be reversely pressurized on the downstream end of the stop valve to be verified, so that during the reverse pressurization process, the leakage rate of the stop valve to be verified is measured, and the measured leakage rate is equivalent to the leakage rate during forward pressurization.

[0048] In one embodiment of the present invention, the pressurization process of the shutoff valve to be verified may include a flow supplement method and a flow collection method. Among them, the flow supplement method is to install the flow meter group and measure the leakage rate at one end of the shutoff valve to be verified corresponding to the pressurization device. The flow collection method is to install the pressurization device at one end of the shutoff valve to be verified, and measure the leakage rate by installing the flow meter group at the other end of the shutoff valve to be verified. Specifically, the reverse pressurization operation of the shutoff valve to be verified includes: reversely pressurizing the test medium under the test medium pressure to the downstream of the shutoff valve to be verified according to the flow supplement method, and monitoring the leakage rate downstream of the reverse pressurization of the shutoff valve to be verified. In this embodiment, because the installation of the pressurization device cannot be conveniently realized upstream of the shutoff valve to be verified, the flow supplement method can be used directly downstream of the shutoff valve to be verified, and between the pressurization device and the shutoff valve to be verified, so as to realize the direct monitoring of the leakage rate when the shutoff valve to be verified is reversely pressurized by the pressurization device.

[0049] like Figure 5 As shown, in one embodiment of the present invention, the present invention further provides a pit penetration testing system 11, including: a sealing pressure ratio acquisition unit 111, used to obtain the forward sealing pressure ratio when the test medium passes through the stop valve to be verified in a set forward flow direction, and the reverse sealing pressure ratio when the test medium passes through the stop valve to be verified in a reverse flow direction; an equivalent detection unit 112, used to perform equivalent detection of the forward pressurization result and the reverse pressurization result of the stop valve to be verified based on the forward sealing pressure ratio, the reverse sealing pressure ratio and the test medium pressure of the test medium; and a sealing test unit 113, used to perform a sealing test on the stop valve to be verified according to the reverse pressurization operation corresponding to the reverse pressurization result when the forward pressurization result and the reverse pressurization result are equivalent.

[0050] In this embodiment, the sealing pressure ratio acquisition unit 111 can be used to obtain the forward sealing pressure ratio and the reverse sealing pressure ratio of the stop valve to be verified when the test medium passes through the stop valve to be verified in the set forward flow direction and in the reverse flow direction. In addition, the equivalent detection unit 112 can be used to determine whether the forward pressure charging result and the reverse pressure charging result of the stop valve to be verified are equivalent based on the obtained forward sealing pressure ratio, the reverse sealing pressure ratio, and the test medium pressure when the test medium is forward pressurized or reverse pressurized. In addition, when it is determined that the forward pressure charging result and the reverse pressure charging result are equivalent, the sealing test unit 113 further replaces the forward pressure charging operation with the reverse pressure charging operation to perform a sealing test on the stop valve to be verified, so that the leakage rate obtained by the sealing test can be equivalent to the leakage rate obtained by the forward pressure charging, so as to achieve the purpose of reducing manpower and construction period.

[0051] In one embodiment of the present invention, the sealing test unit includes: a pressure charging control module, which is used to control the pressure charging device to pressurize the test medium to the stop valve to be verified with the test medium pressure; and a leakage monitoring module, which is used to obtain the leakage rate of the stop valve to be verified monitored by the flow meter group installed between the downstream of the pressure charging device and the reverse pressure charging end of the stop valve to be verified when the stop valve to be verified is pressurized from the reverse direction of the stop valve to be verified. Specifically, when the sealing test unit performs reverse pressure charging, the pressure charging control module can complete the pressure charging of the stop valve to be verified according to the set test medium pressure, and the leakage rate monitored by the flow meter group can be statistically analyzed through the leakage monitoring module. In this embodiment, when the flow meter group is installed, it can be carried out according to the flow supplement method, that is, the flow meter group is installed between the downstream of the pressure charging device and the reverse pressure charging end of the stop valve to be verified.

[0052] It should be noted that the pit penetration test system 11 provided in the above embodiment and the pit penetration test method provided in the above embodiment belong to the same concept, wherein the specific manner in which each module and unit performs the operation has been described in detail in the method embodiment, and will not be repeated here. In actual application, the pit penetration test system 11 provided in the above embodiment can distribute the above functions to different functional modules as needed, that is, divide the internal structure of the device into different functional modules to complete all or part of the functions described above, and this is not limited here.

[0053] See also Figure 6 The electronic device 1 may include a memory 12, a processor 13 and a bus, and may also include a computer program stored in the memory 12 and executable on the processor 13, such as a pit penetration test program.

[0054] Among them, the memory 12 includes at least one type of readable storage medium, and the readable storage medium includes flash memory, mobile hard disk, multimedia card, card-type memory (for example: SD or DX memory, etc.), magnetic memory, disk, optical disk, etc. In some embodiments, the memory 12 can be an internal storage unit of the electronic device 1, such as a mobile hard disk of the electronic device 1. In other embodiments, the memory 12 can also be an external storage device of the electronic device 1, such as a plug-in mobile hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device 1. Further, the memory 12 can also include both an internal storage unit of the electronic device 1 and an external storage device. The memory 12 can not only be used to store application software and various types of data installed in the electronic device 1, such as the code of the pit penetration test, etc., but also can be used to temporarily store data that has been output or is to be output.

[0055] In some embodiments, the processor 13 may be composed of an integrated circuit, for example, a single packaged integrated circuit, or a plurality of packaged integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and a combination of various control chips. The processor 13 is the control core (Control Unit) of the electronic device 1, and uses various interfaces and lines to connect the various components of the entire electronic device 1, and executes or executes the programs or modules (such as the pit penetration test program, etc.) stored in the memory 12, and calls the data stored in the memory 12 to execute various functions of the electronic device 1 and process data.

[0056] The processor 13 executes the operating system and various installed application programs of the electronic device 1. The processor 13 executes the application programs to implement the steps in the above-mentioned pit penetration test method.

[0057] Exemplarily, the computer program may be divided into one or more modules, which are stored in the memory 12 and executed by the processor 13 to complete the present application. The one or more modules may be a series of computer program instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program in the electronic device 1. For example, the computer program may be divided into a sealing pressure acquisition unit 111, an equivalent detection unit 112, and a sealing test unit 113, wherein the sealing test unit 113 includes a charging control module and a leakage monitoring module.

[0058] The above-mentioned integrated unit implemented in the form of a software function module can be stored in a computer-readable storage medium, and the computer-readable storage medium can be non-volatile or volatile. The above-mentioned software function module is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a computer device, or a network device, etc.) or a processor to perform part of the functions of the pit penetration test method described in each embodiment of the present application.

[0059] In summary, the present invention discloses a pit penetration test method, system, electronic device and storage medium, which calculates the forward sealing pressure ratio during forward pressurization and the reverse sealing pressure ratio during reverse pressurization, so that the equivalence of the forward pressurization result and the reverse pressurization result can be further judged according to the experimental medium pressure during forward or reverse pressurization. When the two are equivalent, it can be achieved that when reverse pressurization is easier to achieve the test purpose under certain working conditions, the reverse pressurization can be directly used to perform a sealing test to replace the original forward pressurization process, so that the reverse sealing test result can be equivalent to the forward sealing test result, so as to achieve the purpose of reducing manpower and construction period. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0060] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A pit penetration test method, characterized in that: The steps include: Obtain the forward sealing specific pressure when the test medium passes through the stop valve to be verified in the set forward flow direction, and the reverse sealing specific pressure when the test medium passes through the stop valve to be verified in the reverse flow direction; Based on the forward sealing specific pressure, the reverse sealing specific pressure and the test medium pressure of the test medium, performing equivalent detection of the forward pressurization result and the reverse pressurization result of the stop valve to be verified; When the forward pressure charging result and the reverse pressure charging result are equivalent, the sealing test of the stop valve to be verified is performed according to the reverse pressure charging operation corresponding to the reverse pressure charging result.

2. The pit penetration testing method according to claim 1, characterized in that: Obtain the forward sealing specific pressure when the test medium passes through the stop valve to be verified in the set forward flow direction, and the reverse sealing specific pressure when the test medium passes through the stop valve to be verified in the reverse flow direction, including: The test medium is positively pressurized through the valve sealing surface of the electric stop valve to be verified in the positive flow direction to obtain the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism during the positive stamping process; The test medium is reversely pressurized through the valve sealing surface of the electric stop valve to be verified in the reverse flow direction to obtain the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism during the reverse punching process; The forward sealing specific pressure is calculated according to the valve stem thrust, packing friction resistance, test additional sealing force and bellows load provided by the driving mechanism during the forward stamping process; The reverse sealing specific pressure is calculated based on the valve stem thrust provided by the driving mechanism during the reverse punching process, the packing friction resistance, the test additional sealing force and the bellows load.

3. The pit penetration testing method according to claim 2, characterized in that: The calculation formula of the positive seal specific pressure is: The calculation formula of the reverse seal specific pressure is: Among them, P 正 is the positive seal specific pressure, P 反 is the reverse seal specific pressure, F 关1 The valve stem thrust provided to the drive mechanism during the forward stamping process, F SP1 is the friction resistance of the filler during the forward stamping process, F b1 is the bellows load during the forward punching process, F t1 The additional sealing force during the positive punching test, F 关2 The valve stem thrust provided to the drive mechanism during the reverse punching process, F SP2 is the friction resistance of the filler during the reverse punching process, F b2 is the bellows load during the reverse punching process, F t2 It is the additional sealing force of the test during the reverse punching process, and S is the sealing area.

4. The pit penetration testing method according to claim 1, characterized in that: Based on the forward sealing specific pressure, the reverse sealing specific pressure and the test medium pressure of the test medium, an equivalent test of the forward pressurization result and the reverse pressurization result of the stop valve to be verified is performed, including: Under the test medium pressure, whether one of the following two conditions is met: The difference between the forward sealing specific pressure and the reverse sealing specific pressure is less than a preset value; The difference between the forward sealing specific pressure and the reverse sealing specific pressure is greater than a preset value, the forward sealing specific pressure is greater than an effective sealing set value, and the reverse sealing specific pressure is greater than an effective sealing set value; If so, it is determined that the forward charging result and the reverse charging result are equivalent, and if not, it is determined that the forward charging result and the reverse charging result are not equivalent.

5. The pit penetration testing method according to claim 1, characterized in that: Perform a sealing test on the stop valve to be verified according to the reverse pressure charging operation corresponding to the reverse pressure charging result, including: The forward pressure charging operation of the test medium on the stop valve to be verified is equivalently switched to the reverse pressure charging operation on the stop valve to be verified, and the leakage rate of the stop valve to be verified during the reverse pressure charging operation is obtained.

6. The pit penetration testing method according to claim 5, characterized in that: The reverse pressurization operation of the stop valve to be verified includes: reversely pressurizing the test medium under the test medium pressure to the downstream of the stop valve to be verified according to the flow replenishment method, and monitoring the leakage rate downstream of the reverse pressurization of the stop valve to be verified.

7. A pit penetration test system, characterized in that: include: A sealing pressure ratio acquisition unit, used to acquire the forward sealing pressure ratio when the test medium passes through the stop valve to be verified in a set forward flow direction, and the reverse sealing pressure ratio when the test medium passes through the stop valve to be verified in a reverse flow direction; An equivalent detection unit, used for performing equivalent detection of a forward pressure charging result and a reverse pressure charging result of the stop valve to be verified based on the forward sealing specific pressure, the reverse sealing specific pressure and the test medium pressure of the test medium; as well as The sealing test unit is used to perform a sealing test on the stop valve to be verified according to the reverse pressurization operation corresponding to the reverse pressurization result when the forward pressurization result and the reverse pressurization result are equivalent.

8. The pit penetration testing system according to claim 7, characterized in that: The sealing test unit comprises: A pressure charging control module, used for controlling the pressure charging device to pressurize the test medium into the stop valve to be verified at the test medium pressure; and The leakage monitoring module is used to obtain the leakage rate of the stop valve to be verified when it is pressurized in the reverse direction of the stop valve to be verified, as monitored by a flow meter group installed between the downstream of the charging device and the reverse charging end of the stop valve to be verified.

9. An electronic device, characterized in that: The electronic device comprises: one or more processors; A storage device for storing one or more programs, when the one or more programs are executed by the one or more processors, enables the electronic device to implement the pit penetration test system method as described in any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor of a computer, the computer is caused to execute the pit penetration testing system method according to any one of claims 1 to 6.

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