An ultra-supercritical safety valve test platform under actual working conditions

Abstract

The present invention relates to the field of valve testing, and discloses an ultra-supercritical safety valve test platform under actual working conditions, the test platform comprising an air intake pipe; one end of the air intake pipe is connected to the main steam pipeline of a 660MW ultra-supercritical power generation unit, and the other end is connected to a test pipe section; a safety valve test pipe seat is arranged in the middle of the test pipe section, and a safety valve is arranged above the safety valve test pipe seat; an electric gate valve is arranged on the air intake pipe. The present invention solves the problem that ultra-supercritical safety valves cannot be simulated under actual working conditions, that is, at a design temperature of 605°C and a design pressure of 25MPa. The present invention can improve the inspection capability of ultra-supercritical safety valves, thereby verifying whether the performance of ultra-supercritical safety valves meets the use requirements.

Description

Technical Field

[0001] The invention belongs to the field of valve testing, and more specifically relates to an ultra-supercritical safety valve testing platform under actual working conditions. Background Art

[0002] The existing safety valve test platform can only meet the test requirements of safety valves of subcritical and lower parameter units, with a test pressure of less than 20MPa and a test steam temperature of less than 400°C. The design temperature of ultra-supercritical safety valves is 605°C and the design pressure is 25MPa. The pressure and temperature parameters of the existing safety valve test platform cannot meet the actual parameter hot action performance test requirements of ultra-supercritical safety valves. Summary of the invention

[0003] In order to solve the problem that the pressure and temperature parameters of the safety valve test platform in the prior art cannot meet the test requirements of the actual parameter hot action performance of the ultra-supercritical safety valve, the present invention provides an ultra-supercritical safety valve test platform under actual working conditions.

[0004] The specific scheme adopted by the present invention is: an ultra-supercritical safety valve test platform under actual working conditions, the test platform includes an air intake pipe; one end of the air intake pipe is connected to the main steam pipeline of the 660MW ultra-supercritical generator set, and the other end is connected to the test pipe section; a safety valve test pipe seat is arranged in the middle of the test pipe section, and a safety valve is arranged above the safety valve test pipe seat; an electric gate valve is arranged on the air intake pipe.

[0005] A first hanging device is arranged on the air intake pipe, and a damper is arranged on the first hanging device.

[0006] A second hanging device is arranged on the test pipe section, and a damper is arranged on the second hanging device.

[0007] An air vent valve and a drain valve are arranged at the end of the test pipe section.

[0008] A pressure self-control gate valve is arranged at the connection between the air inlet pipe and the test pipe section.

[0009] A displacement sensor is arranged on the top of the safety valve; the displacement sensor is connected to a data collector via a data transmission cable.

[0010] The data collector transmits the data to the data processing and display device, and the data collector transmits the processed data to the pressure sensor arranged on the test pipe section.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The present invention connects the 660MW ultra-supercritical generator set to an air intake pipe, which leads out steam that meets the test requirements of the ultra-supercritical safety valve, providing a real test environment for the safety valve, solving the problem that the ultra-supercritical safety valve cannot be simulated under actual working conditions (temperature 605°C, pressure 25MPa). The present invention improves the inspection capability of the ultra-supercritical safety valve, thereby verifying whether the performance of the ultra-supercritical safety valve meets the use requirements.

[0013] 2. The present invention arranges a pressure self-control gate valve on the air inlet pipe to automatically control the connection and disconnection between the test pipe section and the ultra-supercritical generator set during the test process, so that the entire test process of the safety valve will not cause energy waste and safety hazards to the generator set.

[0014] 3. The present invention uses a safety valve, a pressure sensor and a data collector to display in real time the changes in the set pressure, discharge pressure and return pressure of the ultra-supercritical safety valve during operation under actual working conditions, and draws a pressure change curve, thereby further detecting the performance of the safety valve.

[0015] 4. The present invention uses a safety valve performance data acquisition and processing system, a displacement sensor and a data collector to display in real time the changes in the valve opening height during the operation of the ultra-supercritical safety valve under actual working conditions, and draw an opening height change curve, thereby further detecting the performance of the safety valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the connection between the data logger and the safety valve;

[0018] Wherein, the reference numerals are respectively:

[0019] 1.660MW ultra-supercritical generator set, 2. air intake pipe, 4. test pipe section, 5. second hanging device, 6. damper, 7. safety valve test pipe seat, 8. safety valve, 9. displacement sensor, 10. pressure sensor, 11. data transmission cable, 121. data acquisition device, 122. data processing and display device, 13. vent valve, 14. steam trap, 31. pressure self-control gate valve, 32. electric gate valve, 33. first hanging device. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] The present invention provides an ultra-supercritical safety valve test platform under actual working conditions, the test platform comprising an air intake pipe 2; one end of the air intake pipe 2 is connected to the main steam pipeline of a 660MW ultra-supercritical power generation unit 1, and the other end is connected to a test pipe section 4; a safety valve test pipe seat 7 is arranged in the middle of the test pipe section 4, and a safety valve 8 is arranged above the safety valve test pipe seat 7; an electric gate valve 32 is arranged on the air intake pipe 2.

[0022] The air intake pipe 5 is provided with a first hanging device 33 , and the first hanging device 33 is provided with a damper 6 .

[0023] A second hanging device 5 is provided on the test pipe section 4 , and a damper 6 is provided on the second hanging device 5 .

[0024] An air release valve 13 and a drain valve 14 are provided at the end of the test pipe section 4 .

[0025] A displacement sensor 9 is disposed on the top of the safety valve 8 ; the displacement sensor 9 is connected to a data collector 121 via a data transmission cable 11 .

[0026] The data collector 121 transmits the data to the data processing and display device 122 , and the processed data collector 121 transmits the processed data to the pressure sensor 10 disposed on the test pipe section 4 for connection.

[0027] The present invention inputs the ultra-supercritical steam (temperature 605°C, pressure 25MPa) generated by the 660MW ultra-supercritical generator set 1 into the test pipe section 4 through the air inlet pipe 2. The test pipe section 4 is also connected to the safety valve 8, and the test pipe section 4 provides test conditions for the safety valve 8. An electric gate valve 32 is arranged between the 660MW ultra-supercritical generator set and the test pipe section to control the air intake and pressure of the test pipe section. In order to ensure the stability of the test pipe 4 of the safety valve 8 during the entire test process, a second hanging device 5 is installed on the test pipe section, and a damper 6 is arranged on the second hanging device 5. The safety valve 8 is connected to the test pipe section 4 through the safety valve test pipe seat 7 to provide test conditions for the safety valve. A displacement sensor 9 is arranged on the top of the safety valve 8; the displacement sensor 9 is connected to the data acquisition device 121 through the data transmission cable 11. The data acquisition device 121 transmits the data to the data processing and display device 122, and the processed data acquisition device 121 transmits the processed data to the pressure sensor 10 arranged on the test pipe section 4. It is used to record the changes in the opening height and pressure during the operation of the safety valve 8. The data of the displacement sensor 9 and the pressure sensor 10 are transmitted to the safety valve performance data collector and the data processing and display device through the data transmission cable 11, and the test data of the safety valve is displayed in real time by using the data collector 121 and the data processing and display device 122, and the relevant data curve is drawn; the vent valve 13 and the steam trap 14 are used to discharge the medium in the test pipe section 4 after the test is completed.

[0028] Working process:

[0029] Open the electric gate valve. As the pressure of the pipe section increases, the pressure self-control gate valve will automatically open. The steam of 1 in the 660MW ultra-supercritical generator set is introduced into the test pipe section 4. When the pressure in the test pipe section reaches the set pressure of the safety valve 8, the safety valve 8 starts to operate. The data of the displacement sensor 9 and the pressure sensor 10 are transmitted to the safety valve performance data acquisition and processing system 12 through the data transmission cable 11, and the test data of the safety valve is displayed in real time, and the relevant data curve is drawn. When the pipe section pressure drops to the return seat pressure of the safety valve, the pressure self-control gate valve automatically closes, blocks the medium, closes the electric gate valve, opens the vent valve 13 and the steam trap 14, and completes the entire ultra-supercritical safety valve test process.

[0030] The present invention uses a pressure self-control gate valve to control the pressure of the test pipe section during the safety valve test process, and automatically isolates the high-temperature and high-pressure steam in the 660MW ultra-supercritical generator set after the test is completed. The pressure self-control gate valve is a cylinder-acting gate valve, the lower end of the cylinder piston is connected to the test pipe section and the pressure controller, and the upper end of the piston is equipped with a spring. Before the safety valve is tested, the medium force at the lower end of the cylinder piston is greater than the spring force at the upper end, and the gate valve is in an open state. After the safety valve is tested, the pressure of the test pipe section drops, and the medium force at the lower end of the cylinder piston is less than the spring force at the upper end, so that the gate valve is quickly closed, blocking the steam of the ultra-supercritical generator set, and protecting the generator set to operate normally and stably.

[0031] The present invention utilizes a safety valve performance data collector and a data processing and display device to display in real time the changes in the set pressure, discharge pressure and return seat pressure of the ultra-supercritical safety valve during the operation process under actual working conditions, and draw a pressure change curve. A pressure measuring point is set at a location where the medium flow is basically parallel to the pipe wall and close to the safety valve pipe seat, and a pressure transmitter with a response frequency of not less than 1000Hz is installed at the pressure measuring point, that is, not less than 1000 data can be collected in 1 second. During the safety valve test, the transmitter transmits pressure data to the control room in real time, which is analyzed and processed by the control room software, and the set pressure, discharge pressure, return seat pressure and corresponding time data of the safety valve are extracted to draw a pressure-time relationship curve.

Claims

1. An ultra-supercritical safety valve test platform under actual working conditions, characterized in that: The test platform comprises an air intake pipe (2); one end of the air intake pipe (2) is connected to the main steam pipe of the 660MW ultra-supercritical power generation unit (1), and the other end is connected to the test pipe section (4); a safety valve test pipe seat (7) is arranged in the middle of the test pipe section (4); a safety valve (8) is arranged above the safety valve test pipe seat (7); an electric gate valve (32) is arranged on the air intake pipe (2), a pressure self-control gate valve (31) is arranged at the connection between the air intake pipe (2) and the test pipe section (4), and the pressure self-control gate valve (31) is arranged at the connection between the air intake pipe (2) and the test pipe section (4). 1) is a cylinder-actuated gate valve, the lower end of the cylinder piston is connected to a test pipe section (4) and a pressure controller, and the upper end of the cylinder piston is provided with a spring. Before the safety valve is operated in a test, the medium force at the lower end of the cylinder piston is greater than the spring force at the upper end, and the pressure self-control gate valve (31) is in an open state. After the safety valve is operated in a test, the pressure in the test pipe section (4) decreases, and the medium force at the lower end of the cylinder piston is less than the spring force at the upper end, so that the pressure self-control gate valve (31) is quickly closed, thereby blocking the steam of the ultra-supercritical generator set and protecting the generator set to operate normally and stably.

2. The ultra-supercritical safety valve test platform under actual working conditions according to claim 1 is characterized in that: A first hanging device (33) is provided on the air intake pipe (2), and a damper (6) is provided on the first hanging device (33).

3. The ultra-supercritical safety valve test platform under actual working conditions according to claim 1 is characterized in that: A second hanging device (5) is provided on the test pipe section (4), and a damper (6) is provided on the second hanging device (5).

4. The ultra-supercritical safety valve test platform under actual working conditions according to claim 1 is characterized in that: An air release valve (13) and a drain valve (14) are provided at the end of the test pipe section (4).

5. The ultra-supercritical safety valve test platform under actual working conditions according to any one of claims 1 to 4, characterized in that: A displacement sensor (9) is arranged on the top of the safety valve (8); the displacement sensor (9) is connected to a data acquisition device (121) via a data transmission cable (11).

6. The ultra-supercritical safety valve test platform under actual working conditions according to claim 5 is characterized in that: The data collector (121) transmits the data to the data processing and display device (122), and the data collector (121) transmits the processed data to the pressure sensor (10) disposed on the test pipe section (4).

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