A dynamic and static water test device and test method for high temperature and high pressure equipment

Abstract

The present invention discloses a dynamic and static water test device and a test method for high-temperature and high-pressure equipment, comprising a test piece, a natural circulation loop and a valve body assembly; the input end and the output end of the natural circulation loop are connected to the input end and the output end of the test piece through the valve body assembly; the natural circulation loop comprises a first pipe connected to the test piece, a heating pipe connected to the first pipe, and a cooling pipe connected to the first pipe; a second pipe is connected to the heating pipe and the cooling pipe; the present invention sets up multiple natural circulation loops and multiple groups of test pieces, and controls the connection relationship between the natural circulation loops and the test pieces through the valve body assembly, realizes hot and cold shock tests through mutually isolated natural circulation loops, realizes cyclic tests of multiple groups of test pieces by adjusting the on and off of the natural circulation loops, and realizes natural circulation by utilizing the pressure head generated by the heating pipe and the cooling pipe in the natural circulation loop, thereby solving the problems of high energy consumption, poor high temperature resistance and high cost.

Description

Technical Field

[0001] The present invention relates to the general technical field of water testing, and in particular to a dynamic and static water testing device and a testing method for high-temperature and high-pressure equipment. Background Art

[0002] During the design and manufacturing process, new high-temperature and high-pressure equipment, such as pumps and valves, requires extensive high-temperature and high-pressure testing according to standards. Currently, high-temperature and high-pressure testing is mainly divided into two types: high-temperature and high-pressure dynamic water testing and high-temperature and high-pressure static water testing.

[0003] Since the high-temperature and high-pressure dynamic water test device requires a pump as a motion drive, the high-temperature and high-pressure dynamic water test device consumes huge electricity during the test. Generally, it is necessary to increase the power of a pump to the original normal heating power. Under normal circumstances, the power of such a pump needs to reach more than 200kw, while the original normal heating power is only 60kw under full load. In comprehensive tests, more than two pumps are often required, which leads to the cost of the high-temperature and high-pressure dynamic water test device being much higher than that of the high-temperature and high-pressure static water test device. At the same time, the cost of the high-temperature and high-pressure dynamic water test is much higher than that of the high-temperature and high-pressure static water test, resulting in the high cost of the development of newly developed high-temperature and high-pressure equipment and insufficient testing. Its products are reflected in poor on-site compliance of product performance and low operational reliability. Summary of the Invention

[0004] The technical problem to be solved by the present invention is the basic problem of high cost and high testing cost of high-temperature and high-pressure dynamic water test equipment. At the same time, the pumps used in some test equipment cannot withstand the hot and cold shock of more than 400℃ / s, and the capacity of the high-temperature and high-pressure dynamic water test equipment is limited. The purpose is to provide a dynamic and static water test device and test method for high-temperature and high-pressure equipment, which solves the problems of high cost and poor operational reliability.

[0005] The present invention is achieved through the following technical solutions:

[0006] A dynamic and static water test device for high temperature and high pressure equipment, comprising:

[0007] n groups of test pieces, including the first group of test pieces, the second group of test pieces, ..., the nth group of test pieces;

[0008] m natural circulation loops, including the first natural circulation loop, the second natural circulation loop, ..., the mth natural circulation loop;

[0009] a valve body assembly, wherein the input end and the output end of the natural circulation loop are in communication with the input end and the output end of the test piece through the valve body assembly;

[0010] The natural circulation loop comprises:

[0011] a first pipeline, an output end of which is in communication with an input end of the test piece, an input end of the first pipeline is in communication with an output end of the test piece, and a flow regulating control valve is connected in series to the first pipeline;

[0012] a heating pipe, one end of which is connected to the output end of the first pipe;

[0013] a cooling pipe, one end of which is connected to the input end of the first pipe;

[0014] Two ends of the second pipe are respectively connected to the other end of the heating pipe and the other end of the cooling pipe.

[0015] Optionally, the natural circulation loop further includes a sewage pipe provided on the second pipeline and a pressure stabilizer connected to the second pipeline.

[0016] Preferably, the heating pipe is a vertical pipe, and a heating element is provided inside the heating pipe;

[0017] The cooling pipe is a vertical pipe, and the cooling pipe dissipates heat through natural convection or forced convection;

[0018] The second pipeline and the first pipeline are both horizontal pipelines.

[0019] Specifically, the valve body assembly includes 2n isolation valves and 2m selective communication valves;

[0020] 2n isolation valves including:

[0021] The 11th isolation valve and the 12th isolation valve connected to both ends of the first group of test pieces;

[0022] The 21st isolation valve and the 22nd isolation valve connected to both ends of the second group of test pieces;

[0023] …

[0024] The n1th isolation valve and the n2th isolation valve connected to both ends of the nth group of test pieces;

[0025] 2m selector valves include:

[0026] an 11th selective communication valve and a 12th selective communication valve connected to both ends of the first natural circulation loop;

[0027] a 21st selective communication valve and a 22nd selective communication valve connected to both ends of the second natural circulation loop;

[0028] …

[0029] an m1th selective communication valve and an m2th selective communication valve connected to both ends of the mth natural circulation loop;

[0030] Each of the selective communication valves is provided with n interfaces, and is respectively connected to the n isolation valves, and can be communicated with one or more of the n isolation valves.

[0031] Specifically, the 11th selective communication valve is connected to the 11th isolation valve, the 21st isolation valve, ..., the n1th isolation valve;

[0032] The 12th selective connecting valve is connected to the 12th isolation valve, the 22nd isolation valve, ..., the n2th isolation valve;

[0033] …

[0034] The m1th selective connecting valve is connected to the 11th isolation valve, the 21st isolation valve, ..., the n1th isolation valve;

[0035] The m2th selective connecting valve is connected to the 12th isolation valve, the 22nd isolation valve, ..., the n2th isolation valve.

[0036] A method for dynamic and static water testing of high-temperature and high-pressure equipment, based on the above-mentioned dynamic and static water testing device for high-temperature and high-pressure equipment, is provided. The method includes:

[0037] Determine m ≥ n;

[0038] Connect the 11th selective communication valve to the 11th isolation valve, connect the 21st selective communication valve to the 21st isolation valve, ..., connect the n1th selective communication valve to the n1th isolation valve, and connect the n2th selective communication valve to the n2th isolation valve;

[0039] The temperatures of the heating and cooling pipes are controlled, and n groups of test pieces are tested individually.

[0040] A method for dynamic and static water testing of high-temperature and high-pressure equipment, based on the above-mentioned dynamic and static water testing device for high-temperature and high-pressure equipment, for performing a thermal shock test on a single set of test pieces includes:

[0041] Determine n = 1, m = 2, set the first natural circulation loop as the cooling loop, and the second natural circulation loop as the heating loop;

[0042] A1. Conduct thermal shock test;

[0043] a11. Connect the first group of test pieces to the first natural circulation loop; that is, connect the 11th isolation valve to the 11th selective connecting valve, and connect the 12th isolation valve to the 12th selective connecting valve;

[0044] a12. Control the temperature of the heating pipe and the cooling pipe to maintain the flow of the medium in the first natural circulation loop and the second natural circulation loop;

[0045] a13. Connect the first group of test pieces to the second natural circulation loop; that is, connect the 11th isolation valve to the 21st selective connecting valve, and connect the 12th isolation valve to the 22nd selective connecting valve;

[0046] A2. Conduct cold shock test;

[0047] a21. Connect the first group of test pieces to the second natural circulation loop; that is, connect the 11th isolation valve to the 21st selective connecting valve, and connect the 12th isolation valve to the 22nd selective connecting valve;

[0048] a22. Control the temperature of the heating pipe and the cooling pipe to maintain the flow of the medium in the first natural circulation loop and the second natural circulation loop;

[0049] a23. Connect the first group of test pieces to the first natural circulation loop; that is, connect the 11th isolation valve to the 11th selective connecting valve, and connect the 12th isolation valve to the 12th selective connecting valve.

[0050] A method for dynamic and static water testing of high-temperature and high-pressure equipment, based on the above-mentioned dynamic and static water testing device for high-temperature and high-pressure equipment, and for conducting a multi-stage cyclic hot and cold alternating test, includes:

[0051] Determine n=1, m>2, and set the operating state parameters of each of the m natural circulation loops;

[0052] Connect the first group of test pieces to the first natural circulation loop; that is, connect the 11th isolation valve to the 11th selective connecting valve, and connect the 12th isolation valve to the 12th selective connecting valve;

[0053] After completing the test for the set time, connect the first group of test pieces to the second natural circulation loop; that is, connect the 11th isolation valve to the 21st selective connecting valve, and connect the 12th isolation valve to the 22nd selective connecting valve;

[0054] …

[0055] After completing the test for the set time, connect the first group of test pieces to the mth natural circulation loop; that is, connect the 11th isolation valve to the m1th selective connecting valve, and connect the 12th isolation valve to the m2th selective connecting valve;

[0056] After completing the test for the set time, connect the first group of test pieces to the first natural circulation loop and repeat the above steps in sequence to circulate.

[0057] Furthermore, if n>1, when performing a cyclic test on multiple groups of similar test pieces, when the cyclic test on the qth group of test pieces is being performed, the method of adding the pth group of test pieces to the cycle includes:

[0058] B1. When the qth group of test pieces is connected to the ith natural circulation loop, connect the pth group of test pieces to the jth natural circulation loop, q∈[1,n-1], p=q+1, i∈[1,m-1], j=i+1;

[0059] B2. Adjust the operating conditions of the jth natural circulation loop to make them the same as those of the ith natural circulation loop;

[0060] B3. Connect the qth group of test pieces and the pth group of test pieces to the ith natural circulation loop, that is, connect the q1th isolation valve and the p1th isolation valve to the i1th selective connecting valve, and connect the q2th isolation valve and the p2th isolation valve to the i2th selective connecting valve;

[0061] B4. Disconnect the connection between the test piece in group p and the jth circulation loop;

[0062] B5. Adjust the operating condition of the jth circulation loop to restore it to the operating condition before B2;

[0063] B6. Keep the test pieces in group q and group p connected to the same natural circulation loop and complete the circulation test.

[0064] Furthermore, the method for removing the pth group of test pieces from the circulation includes:

[0065] C1. When the qth group of test pieces and the pth group of test pieces are both connected to the ith circulation loop, adjust the operating conditions of the jth natural circulation loop to make them the same as those of the ith natural circulation loop;

[0066] C2. Connect the qth group of test pieces to the jth natural circulation loop, and disconnect the qth group of test pieces from the ith natural circulation loop;

[0067] C3. The qth group of test pieces is connected to the ith natural circulation loop and the test is continued. After the jth natural circulation loop is cooled down, the pth group of test pieces is withdrawn.

[0068] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0069] The present invention provides multiple natural circulation loops and multiple groups of test pieces, and controls the connectivity between the natural circulation loops and the test pieces through a valve body assembly. Hot and cold shock tests are implemented through mutually isolated natural circulation loops, and circulation tests of multiple groups of test pieces are implemented by adjusting the on and off state of the natural circulation loops. Furthermore, natural circulation is implemented by utilizing the pressure head generated by the heating pipe and the cooling pipe in the natural circulation loop, thereby solving the problems of high energy consumption, poor high temperature resistance, and high cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, are used to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention, and the accompanying drawings are included in and constitute a part of this specification and do not constitute a limitation of the embodiments of the present invention.

[0071] Figure 1 The figure is a simplified logical structure diagram of a dynamic and static water test device for high-temperature and high-pressure equipment according to the present invention.

[0072] Figure 2 It is a structural schematic diagram of a dynamic and static water test device for high-temperature and high-pressure equipment according to the present invention.

[0073] Reference numerals: 1-n group of test pieces, 2-valve body assembly, 3-first pipe, 4-heating pipe, 5-cooling pipe, 6-second pipe. DETAILED DESCRIPTION

[0074] To make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the relevant content and are not intended to limit the present invention.

[0075] It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the drawings.

[0076] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0077] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0078] In the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0079] Example 1

[0080] A dynamic and static water test device for high-temperature and high-pressure equipment comprises a test piece, a natural circulation loop and a valve body assembly 2.

[0081] The n groups of test pieces 1 are named as the first group of test pieces, the second group of test pieces, ..., the nth group of test pieces; the m natural circulation loops are named as the first natural circulation loop, the second natural circulation loop, ..., the mth natural circulation loop;

[0082] The input and output ends of the natural circulation loop are connected to the input and output ends of the test piece through the valve body assembly 2;

[0083] The valve body assembly 2 in this embodiment has a multi-channel and multi-pass function, that is, it can connect any group of test pieces with any natural circulation pipeline. Therefore, in practice, a group of test pieces can be connected with a natural circulation loop according to specific circumstances.

[0084] like Figure 2 As shown, in order to realize the function of the natural circulation loop, the natural circulation loop in this embodiment includes a first pipe 3, a heating pipe 4, a cooling pipe 5 and a second pipe 6.

[0085] The output end of the first pipeline 3 is connected to the input end of the test piece through a connecting pipeline, and the input end of the first pipeline 3 is connected to the output end of the test piece through a connecting pipeline. A flow regulating control valve is connected in series on the first pipeline 3, and the flow regulating valve can be used to control the flow of the entire natural circulation loop.

[0086] One end of the heating pipe 4 is connected to the output end of the first pipe 3, one end of the cooling pipe 5 is connected to the input end of the first pipe 3, and both ends of the second pipe 6 are connected to the other end of the heating pipe 4 and the other end of the cooling pipe 5 respectively.

[0087] The heating pipe 4, the cooling pipe 5, the second pipe 6 and the first pipe 3 form a rectangular structure, that is, the heating pipe 4 and the cooling pipe 5 are vertical pipes, and the first pipe 3 and the first pipe 3 are both horizontal pipes.

[0088] The heating pipe 4 is equipped with a heating element, and the cooling pipe 5 dissipates heat through natural convection or forced convection. A test medium such as water or oil is installed in the natural circulation loop. The principle of natural circulation in the natural circulation loop is that media at different temperatures have different densities, and thus a pressure head exists between the cooling section and the heating section, thereby achieving flow of the medium. Therefore, in this embodiment, by heating in the heating pipe 4 and cooling in the cooling pipe 5, a pressure head is generated at both ends of the first pipe 3, thereby causing the test medium to flow. The flow pressure head calculation formula is as follows: dp = ∑ρ 热 gh 热 -∑ρ 冷 gh 冷 , due to the pressure difference, the fluid flows.

[0089] In addition, the natural circulation loop also includes a drain pipe arranged on the second pipe 6 and a pressure stabilizer connected to the second pipe 6 to ensure that the inlet pressure of the heating section is maintained within a certain range during the temperature rise process, and the inlet pressure of the heating section can be controlled by replenishing or releasing pressure in the pressure stabilizer.

[0090] Example 2

[0091] like Figure 1 As shown, this embodiment provides a simplified logic diagram between the natural circulation loop and the test piece. Figure 1 In the example, n=4 and m=4 are taken, and in practice, corresponding adjustments can be made according to specific circumstances.

[0092] The valve body assembly 2 includes 2n isolation valves and 2m selective connecting valves. The 2n isolation valves are respectively installed at both ends of n test pieces, and the 2m selective connecting valves are respectively installed at both ends of m natural circulation loops.

[0093] For the convenience of description, 2n isolation valves are assumed to include:

[0094] The 11th and 12th isolation valves connected to both ends of the first group of test pieces;

[0095] The 21st isolation valve and the 22nd isolation valve connected to both ends of the second group of test pieces;

[0096] …

[0097] The n1th isolation valve and the n2th isolation valve connected to both ends of the nth group of test pieces;

[0098] For the convenience of description, it is assumed that 2m selective connection valves include:

[0099] The 11th selective connecting valve and the 12th selective connecting valve connected to both ends of the first natural circulation loop;

[0100] The 21st selective connecting valve and the 22nd selective connecting valve connected to both ends of the second natural circulation loop;

[0101] …

[0102] an m1th selective communication valve and an m2th selective communication valve connected to both ends of the mth natural circulation loop;

[0103] Each selective connecting valve is provided with n interfaces, which are respectively connected to n isolation valves, and can be connected with one or more of the n isolation valves.

[0104] That is, the 11th selective connecting valve is connected to the 11th isolation valve, the 21st isolation valve, ..., the n1th isolation valve; and the 11th selective connecting valve can be selected to be connected to any one or more of the above isolation valves according to demand.

[0105] The 12th selective connecting valve is connected to the 12th isolation valve, the 22nd isolation valve, ..., the n2th isolation valve; and the 12th selective connecting valve can be selected to be connected to any one or more of the above isolation valves according to demand.

[0106] …

[0107] The m1th selective connecting valve is connected to the 11th isolation valve, the 21st isolation valve, ..., the n1th isolation valve;

[0108] The m2th selective connecting valve is connected to the 12th isolation valve, the 22nd isolation valve, ..., the n2th isolation valve.

[0109] Therefore, by selecting the connecting valve, the ability to connect one or more natural circulation loops to the same group of test pieces can be achieved.

[0110] Example 3

[0111] Based on the first and second embodiments, this embodiment provides a method for dynamic and static water testing of high-temperature and high-pressure equipment. The present invention is to divide the equipment into n groups for separate testing. The testing method includes:

[0112] Determine m≥n; ensure that each group of test pieces can be connected to a natural circulation loop separately.

[0113] Connect the 11th selective communication valve to the 11th isolation valve, connect the 21st selective communication valve to the 21st isolation valve, ..., connect the n1th selective communication valve to the n1th isolation valve, and connect the n2th selective communication valve to the n2th isolation valve;

[0114] The temperatures of the heating pipe 4 and the cooling pipe 5 are controlled, and n groups of test pieces 1 are individually tested.

[0115] At this time, the first group of test pieces, the second group of test pieces, ..., the nth group of test pieces can be tested separately. The test conditions are related to the state of the connected natural circulation loops. The state of the natural loops can be different according to actual needs.

[0116] Example 4

[0117] Based on the first and second embodiments, this embodiment provides a dynamic and static water test method for high-temperature and high-pressure equipment, which is used to perform a thermal shock test on a single group of test pieces. The test method includes:

[0118] Determine n=1, m=2, set the first natural circulation loop as a cooling loop, and the second natural circulation loop as a heating loop; you can also change the state of a natural circulation loop as needed to make it meet the needs of both the cooling loop and the heating loop.

[0119] The methods include thermal shock test and cold shock test.

[0120] A1. Conduct thermal shock test;

[0121] a11. Connect the first group of test pieces to the first natural circulation loop; that is, connect the 11th isolation valve to the 11th selective connecting valve, and connect the 12th isolation valve to the 12th selective connecting valve;

[0122] a12. Control the temperature of the heating pipe 4 and the cooling pipe 5 to maintain the flow of the medium in the first natural circulation loop and the second natural circulation loop;

[0123] a13. Connect the first group of test pieces to the second natural circulation loop; that is, connect the 11th isolation valve to the 21st selective connecting valve, and connect the 12th isolation valve to the 22nd selective connecting valve;

[0124] A2. Conduct cold shock test;

[0125] a21. Connect the first group of test pieces to the second natural circulation loop; that is, connect the 11th isolation valve to the 21st selective connecting valve, and connect the 12th isolation valve to the 22nd selective connecting valve;

[0126] a22. Control the temperature of the heating pipe 4 and the cooling pipe 5 to maintain the flow of the medium in the first natural circulation loop and the second natural circulation loop;

[0127] a23. Connect the first group of test pieces to the first natural circulation loop; that is, connect the 11th isolation valve to the 11th selective connecting valve, and connect the 12th isolation valve to the 12th selective connecting valve.

[0128] That is, by switching the connection relationship between the first group of test pieces between the first natural circulation loop and the second natural circulation loop, the switching between the cold loop and the hot loop is achieved, so that the cold test medium or the hot test medium passes into the test piece, thereby completing the cold shock and thermal shock tests.

[0129] Example 5

[0130] Based on the first and second embodiments, this embodiment provides a dynamic and static water test method for high-temperature and high-pressure equipment, which is used to perform a multi-stage cyclic hot and cold alternating test. The test method includes:

[0131] Determine n=1, m>2, and set the operating state parameters of each of the m natural circulation loops;

[0132] Connect the first group of test pieces to the first natural circulation loop; that is, connect the 11th isolation valve to the 11th selective connecting valve, and connect the 12th isolation valve to the 12th selective connecting valve;

[0133] After completing the test for the set time, connect the first group of test pieces to the second natural circulation loop; that is, connect the 11th isolation valve to the 21st selective connecting valve, and connect the 12th isolation valve to the 22nd selective connecting valve;

[0134] …

[0135] After completing the test for the set time, connect the first group of test pieces to the mth natural circulation loop; that is, connect the 11th isolation valve to the m1th selective connecting valve, and connect the 12th isolation valve to the m2th selective connecting valve;

[0136] After completing the test for the set time, connect the first group of test pieces to the first natural circulation loop and repeat the above steps in sequence to circulate.

[0137] That is, the first group of test pieces are connected to the first natural circulation loop, the second natural circulation loop, ..., the nth natural circulation loop in sequence to realize the circulation test.

[0138] And when the first group of test pieces is connected to the first natural circulation loop, the first group of test pieces is not connected to other circulation loops except the first natural circulation loop. Similarly, when the first group of test pieces is connected to the second natural circulation loop, the first group of test pieces is not connected to other circulation loops except the second natural circulation loop, and so on.

[0139] In order to improve the test efficiency, the same type of test pieces can be added to the cycle for a certain time during the test, that is, n>1 at this time, and it is set that q∈[1,n-1], p=q+1, i∈[1,m-1], j=i+1.

[0140] For example, when performing a cyclic test on multiple groups of similar test pieces, the method for adding the pth group of test pieces to the cycle when the qth group of test pieces is undergoing a cyclic test includes:

[0141] B1. When the qth group of test pieces is connected to the ith natural circulation loop, the pth group of test pieces is connected to the jth natural circulation loop; at this time, the two groups of test pieces are independent of each other and are not connected.

[0142] B2. Adjust the operating conditions of the jth natural circulation loop to make it the same as the operating conditions of the ith natural circulation loop; the operating conditions of the two natural circulation loops are the same, so that the two groups of test pieces are under the same operating conditions.

[0143] B3. Connect the qth group of test pieces and the pth group of test pieces to the ith natural circulation loop, that is, connect the q1th isolation valve and the p1th isolation valve to the i1th selective connecting valve, and connect the q2th isolation valve and the p2th isolation valve to the i2th selective connecting valve. Because the two groups of test pieces are placed under the same working conditions in step B2, after connecting the qth group of test pieces to the pth group of test pieces, the pth group of test pieces will not affect the working conditions of the qth group of test pieces, and thus will not affect the test results of the qth group of test pieces.

[0144] B4. Disconnect the connection between the pth group of test pieces and the jth circulation loop.

[0145] B5. Adjust the operating condition of the jth circulation loop to restore it to the operating condition before B2, that is, the jth circulation loop can circulate normally again.

[0146] B6. Bind the qth group of test pieces to the pth group of test pieces, keep the qth group of test pieces and the pth group of test pieces always connected to the same natural circulation loop, and complete the circulation test.

[0147] When conducting long-term batch tests, some test pieces may reach the target or exit midway. For example, the exit method for group p of test pieces includes:

[0148] C1. When the qth group of test pieces and the pth group of test pieces are both connected to the ith circulation loop, adjust the operating conditions of the jth natural circulation loop to make them the same as those of the ith natural circulation loop;

[0149] C2. Connect the qth group of test pieces with the jth natural circulation loop, and disconnect the qth group of test pieces from the ith natural circulation loop; during the connection process, the qth group of test pieces, the pth group of test pieces, the ith natural circulation loop, and the jth natural circulation loop will all be connected. Therefore, by keeping the i-th natural circulation loop and the j-th natural circulation loop in the same operating condition, the impact on the qth group of test pieces can be avoided.

[0150] C3. The qth group of test pieces is connected to the ith natural circulation loop and the test is continued. After the jth natural circulation loop is cooled down, the pth group of test pieces is withdrawn.

[0151] Example 6

[0152] This embodiment also provides a flow evaluation method without a flow meter. Since the driving force of the natural circulation loop is small, in order to ensure sufficient flow of the test piece, the test loop does not use a contact flow meter, but uses flow measurement technology to perform flow monitoring and branch flow evaluation.

[0153] Since the test device has no pump, the changes in various parameters have clear physical meanings, making it easy to establish a digital model and realize unmanned automatic testing through control systems such as PLC.

[0154] The total driving force of the device is dp = ∑ρ 热 gh 热 -∑ρ 冷 gh 冷 , due to the conservation of energy, in steady state, the total flow satisfies: where ρ ave represents the average medium density, f w 、U e , A represents the equivalent coefficient related to the flow channel, R 阀 It represents the equivalent parameters of the resistance coefficient of the elbow, tee, isolation valve and optional connecting valve in the pipeline. The physical parameters can be obtained by calculating the corresponding model through the corresponding medium temperature and pressure measurement.

[0155] Each branch pipeline is calculated based on the momentum conservation equation and mass conservation equation.

[0156] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine different embodiments / methods or examples described in this specification and the features of different embodiments / methods or examples, unless they are contradictory.

[0157] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0158] It should be understood by those skilled in the art that the above embodiments are merely for the purpose of illustrating the present invention clearly, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above invention, and these changes or modifications are still within the scope of the present invention.

Claims

1. A dynamic and static water test device for high temperature and high pressure equipment, characterized in that: include: n groups of test pieces (1), including the first group of test pieces, the second group of test pieces, ..., the nth group of test pieces; m natural circulation loops, including the first natural circulation loop, the second natural circulation loop, ..., the mth natural circulation loop; A valve body assembly (2), wherein the input end and the output end of the natural circulation loop are connected to the input end and the output end of the test piece through the valve body assembly (2), and a thermal shock test is achieved through the mutually isolated natural circulation loops; The natural circulation loop comprises: a first pipeline (3), the output end of which is in communication with the input end of the test piece, the input end of the first pipeline (3) is in communication with the output end of the test piece, and a flow regulating control valve is connected in series to the first pipeline (3); a heating pipe (4), one end of which is connected to the output end of the first pipe (3); a cooling pipe (5), one end of which is connected to the input end of the first pipe (3); A second pipe (6), both ends of which are respectively connected to the other end of the heating pipe (4) and the other end of the cooling pipe (5); Wherein, the heating pipe (4) is a vertical pipe, and a heating element is provided inside the heating pipe (4); the cooling pipe (5) is a vertical pipe, and the cooling pipe (5) dissipates heat by natural convection or forced convection; the second pipe (6) and the first pipe (3) are both horizontal pipes; The valve body assembly (2) includes 2n isolation valves and 2m selective communication valves; the 2n isolation valves include: The 11th isolation valve and the 12th isolation valve connected to both ends of the first group of test pieces; The 21st isolation valve and the 22nd isolation valve connected to both ends of the second group of test pieces; …… The n1th isolation valve and the n2th isolation valve connected to both ends of the nth group of test pieces; 2m selector valves include: an 11th selective communication valve and a 12th selective communication valve connected to both ends of the first natural circulation loop; a 21st selective communication valve and a 22nd selective communication valve connected to both ends of the second natural circulation loop; …… an m1th selective communication valve and an m2th selective communication valve connected to both ends of the mth natural circulation loop; Each of the selective communication valves is provided with n interfaces, and is respectively connected to the n isolation valves, and can be communicated with one or more of the n isolation valves; The 11th selective connecting valve is connected to the 11th isolation valve, the 21st isolation valve, ..., the n1th isolation valve; The 12th selective connecting valve is connected to the 12th isolation valve, the 22nd isolation valve, ..., the n2th isolation valve; …… The m1th selective connecting valve is connected to the 11th isolation valve, the 21st isolation valve, ..., the n1th isolation valve; The m2th selective connecting valve is connected to the 12th isolation valve, the 22nd isolation valve, ..., the n2th isolation valve.

2. A dynamic and static water test device for high temperature and high pressure equipment according to claim 1, characterized in that: The natural circulation loop further comprises a sewage discharge pipe provided on the second pipeline (6) and a pressure stabilizer in communication with the second pipeline (6).

3. A method for dynamic and static water testing of high temperature and high pressure equipment, characterized in that: Based on the dynamic and static water test device for high-temperature and high-pressure equipment according to claim 1, the test method of performing separate tests in n groups includes: Determine m ≥ n; Connect the 11th selective communication valve to the 11th isolation valve, connect the 21st selective communication valve to the 21st isolation valve, ..., connect the n1th selective communication valve to the n1th isolation valve, and connect the n2th selective communication valve to the n2th isolation valve; The temperatures of the heating pipe (4) and the cooling pipe (5) are controlled, and n groups of test pieces (1) are individually tested.

4. A method for dynamic and static water testing of high temperature and high pressure equipment, characterized in that: Based on the dynamic and static water test device for high-temperature and high-pressure equipment according to claim 1, a test method for performing a thermal shock test on a single group of test pieces includes: Determine n=1, m=2, set the first natural circulation loop as the cooling loop, and the second natural circulation loop as the heating loop; A1. Conduct thermal shock test; a11. Connect the first group of test pieces to the first natural circulation loop; that is, connect the 11th isolation valve to the 11th selective connecting valve, and connect the 12th isolation valve to the 12th selective connecting valve; a12, controlling the temperature of the heating pipe (4) and the cooling pipe (5) to maintain the flow of the medium in the first natural circulation loop and the second natural circulation loop; a13. Connect the first group of test pieces to the second natural circulation loop; that is, connect the 11th isolation valve to the 21st selective connecting valve, and connect the 12th isolation valve to the 22nd selective connecting valve; A2. Conduct cold shock test; a21. Connect the first group of test pieces to the second natural circulation loop; that is, connect the 11th isolation valve to the 21st selective connecting valve, and connect the 12th isolation valve to the 22nd selective connecting valve; a22, controlling the temperature of the heating pipe (4) and the cooling pipe (5) to maintain the flow of the medium in the first natural circulation loop and the second natural circulation loop; a23. Connect the first group of test pieces to the first natural circulation loop; that is, connect the 11th isolation valve to the 11th selective connecting valve, and connect the 12th isolation valve to the 12th selective connecting valve.

5. A method for dynamic and static water testing of high temperature and high pressure equipment, characterized in that: Based on the dynamic and static water test device for high-temperature and high-pressure equipment according to claim 1, a test method for performing a multi-stage cyclic hot and cold alternating test includes: Determine n=1, m>2, and set the operating state parameters of each of the m natural circulation loops; Connect the first group of test pieces to the first natural circulation loop; that is, connect the 11th isolation valve to the 11th selective connecting valve, and connect the 12th isolation valve to the 12th selective connecting valve; After completing the test for the set time, connect the first group of test pieces to the second natural circulation loop; that is, connect the 11th isolation valve to the 21st selective connecting valve, and connect the 12th isolation valve to the 22nd selective connecting valve; …… After completing the test for the set time, connect the first group of test pieces to the mth natural circulation loop; that is, connect the 11th isolation valve to the m1th selective connecting valve, and connect the 12th isolation valve to the m2th selective connecting valve; After completing the test for the set time, connect the first group of test pieces to the first natural circulation loop and repeat the above steps in sequence to circulate.

6. A dynamic and static water test method for high temperature and high pressure equipment according to claim 5, characterized in that: If n>1, when conducting a cyclic test on multiple groups of similar test pieces, the method of adding the pth group of test pieces to the cycle when the qth group of test pieces is undergoing a cyclic test includes: B1. When the qth group of test pieces is connected to the ith natural circulation loop, connect the pth group of test pieces to the jth natural circulation loop, q∈[1,n-1], p=q+1, i∈[1,m-1], j=i+1; B2. Adjust the operating conditions of the jth natural circulation loop to make them the same as those of the ith natural circulation loop; B3. Connect the qth group of test pieces and the pth group of test pieces to the ith natural circulation loop, that is, connect the q1th isolation valve and the p1th isolation valve to the i1th selective connecting valve, and connect the q2th isolation valve and the p2th isolation valve to the i2th selective connecting valve; B4. Disconnect the connection between the test piece in group p and the jth circulation loop; B5. Adjust the operating condition of the jth circulation loop to restore it to the operating condition before B2; B6. Keep the test pieces in group q and group p connected to the same natural circulation loop and complete the circulation test.

7. A dynamic and static water test method for high temperature and high pressure equipment according to claim 6, characterized in that: The method of removing the pth group of test pieces from the circulation includes: C1. When the qth group of test pieces and the pth group of test pieces are both connected to the ith circulation loop, adjust the operating conditions of the jth natural circulation loop to make them the same as those of the ith natural circulation loop; C2. Connect the p-th group of test pieces to the j-th natural circulation loop, and disconnect the p-th group of test pieces from the i-th natural circulation loop; C3. The qth group of test pieces is connected to the ith natural circulation loop and the test is continued. After the jth natural circulation loop is cooled down, the pth group of test pieces is withdrawn.

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