Test platform for testing steam temperature and pressure reduction device and test method thereof

Abstract

According to the steam temperature and pressure reduction device test platform and the test method thereof, stable and controllable operation of the large-flow and high-parameter steam temperature and pressure reduction device test platform is achieved through cooperation of steam generation, calibration, test, steam exhaust and control. The steam generation device is connected with the steam generation temperature and pressure reduction device, and the steam generation temperature and pressure reduction device is connected with the steam inlet main pipe; a thermometer and a pressure gauge are mounted on the steam inlet main pipe; the condensing device is connected with the pressure reducing device, the pressure reducing device is connected with the steam exhaust main pipe, and a pressure gauge is mounted on the pressure reducing device; the standard positioning steam inlet branch pipe is connected with the steam inlet main pipe and the steam exhaust main pipe; a thermometer, a pressure gauge and a flow meter are mounted on the standard positioning steam exhaust branch pipe; the test position steam inlet branch pipe is connected with the steam inlet main pipe and the steam exhaust main pipe; a thermometer, a pressure gauge and a flow meter are mounted on the test position steam exhaust branch pipe; the steam generation device, the steam generation temperature and pressure reduction device, the pressure reduction device, the thermometer, the pressure gauge and the flow meter are all connected with the control system.

Description

Technical Field

[0001] The present invention relates to a test platform for a steam desuperheating and pressure reducing device and a test method thereof. Background Art

[0002] As a common engineering equipment and also a special equipment, the steam desuperheating and pressure reducing device has a wide range of applications in various industries such as energy, chemical industry, and military industry. However, in high-parameter application scenarios, such as the bypass of ultra-supercritical units and the bypass of nuclear power units, extremely high performance requirements are imposed on the regulating accuracy, operation reliability, etc. of the steam desuperheating and pressure reducing device, and imported equipment is mostly used at present. For such high-end manufacturing equipment, with the continuous improvement of China's manufacturing level, some manufacturers already have the processing and manufacturing strength to replace imported products. However, since such equipment is mostly used in key links, the state and some enterprises have extremely strict supervision requirements for manufacturers of such equipment. Usually, full-flow testing is required, and it can be used only after passing the test.

[0003] At present, the test platforms for steam desuperheating and pressure reducing devices often target low parameters and low flow rates, with simple systems, and only meet the test capabilities of laboratory-level or pilot-scale devices. For the test platform of high-parameter and large-flow steam desuperheating and pressure reducing devices, the test pressure often exceeds 10 MPa, and the flow rate is as high as several hundred tons per hour. Different from the existing small test platforms, it is necessary to overcome engineering and technical difficulties such as large impact on the pipe network during device operation, high requirements for test parameters, and multiple test conditions. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies existing in the prior art, and to provide a steam desuperheating and pressure reducing device test platform with reasonable design and a test method thereof. Through the coordinated cooperation of various parts such as steam generation, calibration, testing, exhaust, and control, engineering and technical difficulties are overcome, and stable and controllable operation of the test platform for large-flow and high-parameter steam desuperheating and pressure reducing devices is achieved.

[0005] The technical solution adopted by the present invention to solve the above problems is: a test platform for a steam desuperheating and pressure reducing device, including a steam generating device, characterized in that: it further includes a steam production desuperheating and pressure reducing device, an inlet steam thermometer, an inlet steam pressure gauge, an inlet steam main pipe, a calibration position thermometer, a calibration position pressure gauge, a calibration position flowmeter, a condensing device, an exhaust steam main pipe, a pressure reducing device, an exhaust steam pressure gauge, a test position thermometer, a test position pressure gauge, a test position flowmeter and a control system; the steam outlet of the steam generating device is connected to the inlet of the steam production desuperheating and pressure reducing device, and the steam outlet of the steam production desuperheating and pressure reducing device is connected to the inlet steam main pipe; an inlet steam thermometer and an inlet steam pressure gauge are installed on the inlet steam main pipe; the inlet of the condensing device is connected to the outlet of the pressure reducing device, the inlet of the pressure reducing device is connected to the exhaust steam main pipe, and an exhaust steam pressure gauge is installed on the inlet of the pressure reducing device; a calibration position and a test position are provided between the inlet steam main pipe and the exhaust steam main pipe; a calibration position inlet steam branch pipe and a calibration position exhaust steam branch pipe are provided in the calibration position; the inlet of the calibration position inlet steam branch pipe is connected to the inlet steam main pipe, and the outlet is connected to the exhaust steam main pipe; a calibration position thermometer, a calibration position pressure gauge and a calibration position flowmeter are installed on the calibration position exhaust steam branch pipe; a test position inlet steam branch pipe and a test position exhaust steam branch pipe are provided in the test position; the inlet of the test position inlet steam branch pipe is connected to the inlet steam main pipe, and the outlet of the test position exhaust steam branch pipe is connected to the exhaust steam main pipe; a test position thermometer, a test position pressure gauge and a test position flowmeter are installed on the test position exhaust steam branch pipe; the control system is connected to the steam generating device, the steam production desuperheating and pressure reducing device, the inlet steam thermometer, the inlet steam pressure gauge, the calibration position thermometer, the calibration position pressure gauge, the calibration position flowmeter, the pressure reducing device, the exhaust steam pressure gauge, the test position thermometer, the test position pressure gauge and the test position flowmeter.

[0006] The present invention further includes an inlet steam safety relief device, and the said inlet steam safety relief device is installed on the inlet steam main pipe.

[0007] The present invention further includes a calibration position safety relief device, and the said calibration position safety relief device is installed on the calibration position exhaust steam branch pipe.

[0008] The present invention further includes a test position safety relief device, and the said test position safety relief device is installed on the test position exhaust steam branch pipe.

[0009] There are multiple test positions in the present invention, which are arranged side by side.

[0010] The pressure reducing device in the present invention adopts a pressure reducing valve.

[0011] The control system in the present invention is a PLC or DCS control system.

[0012] A test method for a test platform of a steam desuperheating and pressure reducing device, used for fast opening function test and fast closing function test, characterized in that: it includes the following steps: (1) Install a calibration desuperheating and pressure reducing device of a certain model in the calibration position. Connect the steam outlet of the steam inlet branch pipe in the calibration position to the steam inlet of the calibration desuperheating and pressure reducing device, and connect the steam inlet of the exhaust branch pipe in the calibration position to the steam outlet of the calibration desuperheating and pressure reducing device; Connect the control system to the calibration desuperheating and pressure reducing device; (2) Install a test desuperheating and pressure reducing device to be tested of a certain model in the test position. Connect the steam outlet of the steam inlet branch pipe in the test position to the steam inlet of the test desuperheating and pressure reducing device, and connect the steam inlet of the exhaust branch pipe in the test position to the steam outlet of the test desuperheating and pressure reducing device; Connect the control system to the test desuperheating and pressure reducing device; (3) Start the steam generating device, the steam production desuperheating and pressure reducing device, and the calibration desuperheating and pressure reducing device, and close the test desuperheating and pressure reducing device; The steam generated by the steam generating device passes through the steam production desuperheating and pressure reducing device, the calibration desuperheating and pressure reducing device, and the pressure reducing device in sequence and then enters the condenser; (4) The inlet steam thermometer and the inlet steam pressure gauge feed back temperature and pressure signals to the control system. The control system then controls the opening of the steam production desuperheating and pressure reducing device to make the temperature and pressure of the inlet steam main pipe reach the set values, establishing the inlet steam temperature and pressure conditions; The exhaust pressure gauge feeds back the pressure signal to the control system. The control system then controls the opening of the pressure reducing device to keep the pressure of the exhaust steam main pipe stable, establishing a stable back pressure condition; (5) The calibration position thermometer and the calibration position pressure gauge feed back temperature and pressure signals to the control system. The control system then controls the opening of the calibration desuperheating and pressure reducing device to make the temperature and pressure of the exhaust steam main pipe reach the set values. At this time, the calibration operation condition is established; (6) The control system sends a closing signal to the calibration desuperheating and pressure reducing device. At the moment of closing, the pressure of the exhaust steam main pipe decreases. After dropping to the set value, the test position pressure gauge sends a signal to the control system to control the opening of the test desuperheating and pressure reducing device, and continuously adjusts the opening according to the test requirements. Finally, the steam production parameters are stabilized, and the quick-opening function test of the test desuperheating and pressure reducing device is completed; (7) The control system sends a closing signal to the test desuperheating and pressure reducing device. At the moment of closing, the pressure of the exhaust steam main pipe decreases. After dropping to the set value, the calibration position pressure gauge sends a signal to the control system to control the calibration desuperheating and pressure reducing device to reopen, and finally the steam production parameters are stabilized, completing the quick-closing function test of the test desuperheating and pressure reducing device; (8) The control system 16 records the test data for steps (6) and (7). Through step (6), the control system 16 obtains the opening characteristic data of the test desuperheating and pressure reducing device. Through step (7), the control system obtains the closing characteristic data of the test desuperheating and pressure reducing device.

[0013] In step (6) of the present invention, after switching the calibration desuperheating and pressure reducing device to the manual control mode, the control system sends a closing signal to the calibration desuperheating and pressure reducing device.

[0014] In step (7) of the present invention, after switching the test desuperheating and pressure reducing device to the manual control mode, the control system sends a closing signal to the test desuperheating and pressure reducing device.

[0015] Compared with the prior art, the present invention has the following advantages and effects: (1) A desuperheating and pressure reducing device for steam production is provided in the steam production part, enabling the inlet steam reference to be controllable and adjustable, and applicable to the test requirements of different inlet steam parameters and different working conditions.

[0016] (2) A calibration desuperheating and pressure reducing device can be set in the calibration position, and a test desuperheating and pressure reducing device can be set in the test position to achieve comparative calibration. In case one set fails, the other set can be quickly put into operation, reducing the impact on the pipe network and ensuring the test requirements under low-load working conditions.

[0017] (3) A pressure reducing device is provided in the exhaust part, which can create a stable and adjustable back pressure condition, meeting the test requirements of different steam production parameters of the desuperheating and pressure reducing device.

[0018] (4) In summary, through the coordinated cooperation of the steam production, calibration, test, exhaust, and control parts, the present invention overcomes the engineering and technical difficulties and realizes the stable and controllable operation of the test platform for large-flow and high-parameter steam desuperheating and pressure reducing devices. Description of the Drawings

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the present invention. Detailed Embodiment

[0020] The present invention will be further described in detail below with reference to the drawings and through embodiments. The following embodiments are explanations of the present invention, and the present invention is not limited to the following embodiments.

[0021] I. The test experimental platform for the steam desuperheating and pressure reducing device according to the embodiment of the present invention includes a steam generating device 1, a steam production desuperheating and pressure reducing device 2, an inlet steam thermometer 3, an inlet steam pressure gauge 4, an inlet steam safety relief device 5, an inlet steam main pipe 6, a calibration position thermometer 8, a calibration position pressure gauge 9, a calibration position flowmeter 10, a calibration position safety relief device 11, a condensing device 12, an exhaust main pipe 13, a pressure reducing device 14, an exhaust pressure gauge 15, a control system 16, a test position thermometer 18, a test position pressure gauge 19, a test position flowmeter 20, and a test position safety relief device 21.

[0022] The steam outlet of the steam generating device 1 is connected to the steam inlet of the steam production desuperheating and pressure reducing device 2, and the steam outlet of the steam production desuperheating and pressure reducing device 2 is connected to the inlet steam main pipe 6. An inlet steam thermometer 3, an inlet steam pressure gauge 4, and an inlet steam safety relief device 5 are installed on the inlet steam main pipe 6. When there are various temperature and pressure requirements for the steam inlet of the test device, the steam inlet parameter requirements of the test device are met through the steam production desuperheating and pressure reducing device 2.

[0023] The steam inlet of the condensing device 12 is connected to the steam outlet of the pressure reducing device 14, and the steam inlet of the pressure reducing device 14 is connected to the exhaust main pipe 13. The pressure reducing device 14 adopts a pressure reducing valve. An exhaust pressure gauge 15 is installed on the steam inlet of the pressure reducing device 14. When there are multiple requirements for the exhaust parameters of the test device, the pressure of the exhaust main pipe 13 is controlled by the pressure reducing device 14 to meet the exhaust number requirements of the test device. The condensing device 12 can create conditions for the continuous and stable operation of the test platform.

[0024] A marking position and a test position are provided between the steam inlet main pipe 6 and the steam exhaust main pipe 13 .

[0025] A standard steam inlet branch pipe 22 and a standard steam exhaust branch pipe 23 are provided in the standard position. The steam inlet of the standard steam inlet branch pipe 22 is connected to the steam inlet main pipe 6, and the steam outlet of the standard steam exhaust branch pipe 23 is connected to the exhaust main pipe 13. The standard temperature and pressure reduction device 17 is provided with an automatic control logic and can be switched to manual control. When the pressure test value of the standard pressure gauge 9 drops below the set value, the standard temperature and pressure reduction device 7 is interlocked and opened, and the opening of the pressure reduction device is controlled according to the pressure test value to ensure the stability of the outlet pressure; when the standard temperature and pressure reduction device 8 drops below the set value, the standard temperature and pressure reduction device 7 is interlocked and opened, and the opening of the temperature reduction device is controlled according to the temperature test value to ensure the outlet temperature.

[0026] A test position steam inlet branch pipe 24 and a test position steam exhaust branch pipe 25 are provided in the test position. The steam inlet of the test position steam inlet branch pipe 24 is connected to the steam inlet main pipe 6, and the steam outlet of the test position steam exhaust branch pipe 25 is connected to the steam exhaust main pipe 13. A test position thermometer 18, a test position pressure gauge 19, a test position flowmeter 20, and a test position safety relief device 21 are installed on the test position steam exhaust branch pipe 25. There are multiple test positions, which are arranged side by side. The test temperature reduction and pressure reduction device 17 is provided with automatic control logic and can be switched to manual control. When the pressure test value of the test position pressure gauge 19 drops below the set value, the test temperature reduction and pressure reduction device 17 is interlocked and opened, and the opening of the pressure reduction device is controlled according to the pressure test value to ensure the stability of the outlet pressure; when the test position thermometer 18 drops below the set value, the test temperature reduction and pressure reduction device 17 is interlocked and opened, and the opening of the temperature reduction device is controlled according to the temperature test value to ensure the outlet temperature.

[0027] The control system 16 is a PLC or DCS control system. The control system 16 is connected to the steam generating device 1, the steam production desuperheating and pressure reducing device 2, the inlet steam thermometer 3, the inlet steam pressure gauge 4, the inlet steam safety relief device 5, the calibration position thermometer 8, the calibration position pressure gauge 9, the calibration position flowmeter 10, the calibration position safety relief device 11, the pressure reducing device 14, the exhaust steam pressure gauge 15, the test position thermometer 18, the test position pressure gauge 19, the test position flowmeter 20, and the test position safety relief device 21. The control system 16 realizes the safety, controllability, adjustability of the test process and the collection and analysis of test data through signal setting, control, and recording at different points.

[0028] II. The test method of the steam desuperheating and pressure reducing device test platform in the embodiment of the present invention is used for the quick opening function test and the quick closing function test, and includes the following steps: (1) Install a calibration desuperheating and pressure reducing device 7 of a certain model at the calibration position. The steam outlet of the calibration position inlet steam branch pipe 22 is connected to the inlet of the calibration desuperheating and pressure reducing device 7, and the inlet of the calibration position exhaust steam branch pipe 23 is connected to the outlet of the calibration desuperheating and pressure reducing device 7. The control system 16 is connected to the calibration desuperheating and pressure reducing device 7. The calibration desuperheating and pressure reducing device 7 is a desuperheating and pressure reducing device with the standard parameters of this model and is used as a standard.

[0029] (2) Install a test desuperheating and pressure reducing device 17 of a certain model to be tested at the test position. The steam outlet of the test position inlet steam branch pipe 24 is connected to the inlet of the test desuperheating and pressure reducing device 17, and the inlet of the test position exhaust steam branch pipe 25 is connected to the outlet of the test desuperheating and pressure reducing device 17. The control system 16 is connected to the test desuperheating and pressure reducing device 17. The test desuperheating and pressure reducing device 17 is a desuperheating and pressure reducing device of the same model as the calibration desuperheating and pressure reducing device 7 and is used to test the performance.

[0030] (3) Start the steam generating device 1, the steam production desuperheating and pressure reducing device 2, and the calibration desuperheating and pressure reducing device 7, and close the test desuperheating and pressure reducing device 17; the steam generated by the steam generating device 1 passes through the steam production desuperheating and pressure reducing device 2, the calibration desuperheating and pressure reducing device 7, and the pressure reducing device 14 in sequence and then enters the condenser device 12; (4) The inlet steam thermometer 3 and the inlet steam pressure gauge 4 feed back temperature and pressure signals to the control system 16, and the control system 16 controls the opening of the steam production desuperheating and pressure reducing device 2 to make the temperature and pressure of the inlet steam main pipe 6 reach the set value, establishing the inlet steam temperature and pressure conditions; The exhaust steam pressure gauge 15 feeds back the pressure signal to the control system 16, and the control system 16 controls the opening of the pressure reducing device 14 to keep the pressure of the exhaust steam main pipe 13 stable, establishing a stable back pressure condition.

[0031] (5) The calibrated positioning thermometer 8 and the calibrated positioning pressure gauge 9 feed back temperature and pressure signals to the control system 16, and the control system 16 then controls the opening degree of the calibrated desuperheating and pressure reducing device 7 to make the temperature and pressure of the exhaust steam main pipe 13 reach the set values, and at this time, the calibrated operating condition is established.

[0032] (6) The calibrated desuperheating and pressure reducing device 7 is switched to the manual control mode. The control system 16 sends a closing signal to the calibrated desuperheating and pressure reducing device 7. At the moment of closing, the pressure of the exhaust steam main pipe 13 decreases. After it drops to the set value, the test position pressure gauge 19 sends a signal to the control system 16, automatically controls the opening of the test desuperheating and pressure reducing device 17, and continuously adjusts the opening degree through the control logic required by the test, and finally realizes the stable production steam parameters to complete the quick opening function test of the test desuperheating and pressure reducing device 17; (7) The test desuperheating and pressure reducing device 17 is switched to the manual control mode. The control system 16 sends a closing signal to the test desuperheating and pressure reducing device 17. At the moment of closing, the pressure of the exhaust steam main pipe 13 decreases. After it drops to the set value, the calibrated positioning pressure gauge 9 sends a signal to the control system 16, automatically controls the calibrated desuperheating and pressure reducing device 7 to reopen, and finally realizes the stable production steam parameters to complete the quick closing function test of the test desuperheating and pressure reducing device 17; (8) The control system 16 records the test data for steps (6) and (7). The main recorded data are the temperature, pressure, flow rate, opening degree, etc. of each monitoring point; through step (6), the control system 16 can obtain the opening characteristic data of the test desuperheating and pressure reducing device 17. Through data analysis, the opening product data of the test desuperheating and pressure reducing device 17 can be obtained, such as the flow rate adjustment range, temperature and pressure response time, and characteristic curves, etc.; through step (7), the control system 16 can obtain the closing characteristic data of the test desuperheating and pressure reducing device 17. Through data analysis, the closing product data of the test desuperheating and pressure reducing device 17 can also be obtained.

[0033] The above test method is a typical test method. In the actual test process, the test conditions can be flexibly adjusted according to requirements to meet the test requirements of different performance parameters. The low-load operation ability is an important indicator to measure the performance of the desuperheating and pressure-reducing device. For example, whether a desuperheating and pressure-reducing device with a steam production capacity of 1000 t / h can operate under steam production conditions of 100 t / h or even lower is very important in actual engineering applications. The difficulty of the low-load test lies in the steam generation system. For example, for a test bench that can test the steam production capacity of 1000 t / h, the steam production capacity of the steam generation system is about 1000 t / h. The low-load stable operation ability of a large-capacity steam generation system is basically above 30%. This means that when testing a desuperheating and pressure-reducing device with a capacity of 1000 t / h under operating conditions of 10%, the required steam generation amount is about 100 t / h. In fact, the steam generation system must produce at least more than 300 t / h of steam to operate stably. Therefore, there is 200 t / h of excess steam. Based on this actual situation, multiple sets of desuperheating and pressure-reducing devices can be set up in parallel in this test system. The excess steam can be consumed by the parallel operation of the desuperheating and pressure-reducing devices other than the calibration group and the test group, so that the test system can meet the test requirements for the desuperheating and pressure-reducing device.

[0034] In addition, it should be noted that for the specific embodiments described in this specification, the shapes and names of their components can be different. The above content described in this specification is only an example of the structure of the present invention. Any equivalent changes or simple changes made according to the structure, features, and principles described in the inventive concept of the present invention are included in the protection scope of the present invention. Those skilled in the art of the present invention can make various modifications, supplements, or use similar methods to replace the specific embodiments described, as long as they do not deviate from the structure of the present invention or exceed the scope defined by this claim book, they should fall within the protection scope of the present invention.

Claims

1. A test platform for a steam desuperheating and pressure-reducing device, comprising a steam generating device, characterized in that: It also includes a steam production desuperheating and pressure reducing device, an inlet steam thermometer, an inlet steam pressure gauge, an inlet steam header pipe, a calibration position thermometer, a calibration position pressure gauge, a calibration position flowmeter, a condensing device, an exhaust steam header pipe, a pressure reducing device, an exhaust steam pressure gauge, a test position thermometer, a test position pressure gauge, a test position flowmeter and a control system; the steam outlet of the steam generating device is connected to the steam inlet of the steam production desuperheating and pressure reducing device, and the steam outlet of the steam production desuperheating and pressure reducing device is connected to the inlet steam header pipe; an inlet steam thermometer and an inlet steam pressure gauge are installed on the inlet steam header pipe; the steam inlet of the condensing device is connected to the steam outlet of the pressure reducing device, the steam inlet of the pressure reducing device is connected to the exhaust steam header pipe, and an exhaust steam pressure gauge is installed on the steam inlet of the pressure reducing device; a calibration position and a test position are arranged between the inlet steam header pipe and the exhaust steam header pipe; a calibration position inlet steam branch pipe and a calibration position exhaust steam branch pipe are arranged in the calibration position; the steam inlet of the calibration position inlet steam branch pipe is connected to the inlet steam header pipe, and the steam outlet is connected to the exhaust steam header pipe; a calibration position thermometer, a calibration position pressure gauge and a calibration position flowmeter are installed on the calibration position exhaust steam branch pipe; a test position inlet steam branch pipe and a test position exhaust steam branch pipe are arranged in the test position; the steam inlet of the test position inlet steam branch pipe is connected to the inlet steam header pipe, and the steam outlet of the test position exhaust steam branch pipe is connected to the exhaust steam header pipe; a test position thermometer, a test position pressure gauge and a test position flowmeter are installed on the test position exhaust steam branch pipe; the control system is connected to the steam generating device, the steam production desuperheating and pressure reducing device, the inlet steam thermometer, the inlet steam pressure gauge, the calibration position thermometer, the calibration position pressure gauge, the calibration position flowmeter, the pressure reducing device, the exhaust steam pressure gauge, the test position thermometer, the test position pressure gauge and the test position flowmeter.

2. The steam desuperheating and pressure reducing device test platform according to claim 1, characterized in that: It also includes an inlet steam safety relief device, and the said inlet steam safety relief device is installed on the inlet steam header pipe.

3. The steam desuperheating and pressure reducing device test platform according to claim 1, characterized in that: It also includes a calibration position safety relief device, and the said calibration position safety relief device is installed on the calibration position exhaust steam branch pipe.

4. The steam desuperheating and pressure reducing device test platform according to claim 1, characterized in that: It also includes a test position safety relief device, and the said test position safety relief device is installed on the test position exhaust steam branch pipe.

5. The steam desuperheating and pressure reducing device test platform according to claim 1, characterized in that: There are multiple said test positions, which are arranged side by side.

6. The test platform for the steam desuperheating and pressure reducing device according to claim 1, characterized in that: The said pressure reducing device uses a pressure reducing valve.

7. The test platform for the steam desuperheating and pressure reducing device according to claim 1, characterized in that: The said control system is a PLC or DCS control system.

8. A test method for a steam desuperheating and pressure reducing device test platform according to any one of claims 1-7, which is used for quick opening function test and quick closing function test, and is characterized in that: It includes the following steps: (1) Install a calibration desuperheating and pressure reducing device of a certain model in the calibration position, connect the steam outlet of the calibration position inlet steam branch pipe to the steam inlet of the calibration desuperheating and pressure reducing device, and connect the steam inlet of the calibration position exhaust steam branch pipe to the steam outlet of the calibration desuperheating and pressure reducing device; the control system is connected to the calibration desuperheating and pressure reducing device; (2) Install a test desuperheating and pressure reducing device to be tested of a certain model in the test position, connect the steam outlet of the test position inlet steam branch pipe to the steam inlet of the test desuperheating and pressure reducing device, and connect the steam inlet of the test position exhaust steam branch pipe to the steam outlet of the test desuperheating and pressure reducing device; the control system is connected to the test desuperheating and pressure reducing device; (3) Start the steam generating device, the steam production desuperheating and pressure reducing device and the calibration desuperheating and pressure reducing device, and close the test desuperheating and pressure reducing device; the steam generated by the steam generating device sequentially passes through the steam production desuperheating and pressure reducing device, the calibration desuperheating and pressure reducing device, the pressure reducing device and then enters the condensing device; (4) The steam inlet thermometer and steam inlet pressure gauge feed back temperature and pressure signals to the control system, and the control system then controls the opening degree of the steam production desuperheating and pressure reducing device to make the temperature and pressure of the steam inlet header reach the set values, thereby establishing the steam inlet temperature and pressure conditions; the exhaust steam pressure gauge feeds back the pressure signal to the control system, and the control system then controls the opening degree of the pressure reducing device to keep the pressure of the exhaust steam header stable, thereby establishing a stable back pressure condition; (5) The calibration positioning thermometer and calibration positioning pressure gauge feed back temperature and pressure signals to the control system, and the control system then controls the opening degree of the calibration desuperheating and pressure reducing device to make the temperature and pressure of the exhaust steam header reach the set values, and at this time, the calibration operation condition is established; (6) The control system sends a closing signal to the calibration desuperheating and pressure reducing device. At the moment of closing, the pressure of the exhaust steam header decreases. After it drops to the set value, the test position pressure gauge sends a signal to the control system to control the opening of the test desuperheating and pressure reducing device, and continuously adjusts the opening degree according to the test requirements. Finally, the steam production parameters are stabilized, and the quick opening function test of the test desuperheating and pressure reducing device is completed; (7) The control system sends a closing signal to the test desuperheating and pressure reducing device. At the moment of closing, the pressure of the exhaust steam header decreases. After it drops to the set value, the calibration positioning pressure gauge sends a signal to the control system to control the reopening of the calibration desuperheating and pressure reducing device, and finally the steam production parameters are stabilized, and the quick closing function test of the test desuperheating and pressure reducing device is completed; (8) The control system 16 records the test data for steps (6) and (7). Through step (6), the control system 16 obtains the opening characteristic data of the test desuperheating and pressure reducing device. Through step (7), the control system obtains the closing characteristic data of the test desuperheating and pressure reducing device.

9. The test method according to claim 1, characterized in that: In step (6), after switching the calibration desuperheating and pressure reducing device to the manual control mode, the control system sends a closing signal to the calibration desuperheating and pressure reducing device.

10. The test method according to claim 1, characterized in that: In step (7), after switching the test desuperheating and pressure reducing device to the manual control mode, the control system sends a closing signal to the test desuperheating and pressure reducing device.

Images