CN112304779A - High-temperature high-pressure pipe service performance online test device for power station - Google Patents
High-temperature high-pressure pipe service performance online test device for power station Download PDFInfo
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- CN112304779A CN112304779A CN202011295953.7A CN202011295953A CN112304779A CN 112304779 A CN112304779 A CN 112304779A CN 202011295953 A CN202011295953 A CN 202011295953A CN 112304779 A CN112304779 A CN 112304779A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses an on-line testing device for service performance of a high-temperature high-pressure pipe for a power station. The invention is characterized in that the service performance test of the pipe and the pipe welding opening is carried out by utilizing the high-temperature high-pressure steam of the in-service power plant. In addition, the device can simulate the working conditions of a power plant during frequent start-stop and peak-shaving operation and research the service performance of the pipe sample during start-stop and peak-shaving operation. The device can acquire the organization and performance evolution law of the pipe sample under the service condition, which cannot be acquired by the conventional test means, and the comprehensive performance data of the pipe, deepens the understanding of the material, accelerates the research and development and engineering application progress of the material and the process, and improves the safety and reliability of the material in the service process. The test device can be connected with a power station operation system at any time, and the operation of a power plant is not influenced. The high-temperature high-pressure steam used by the test device can be continuously used for power generation or heat supply, and is energy-saving and environment-friendly.
Description
Technical Field
The invention belongs to the field of research and development of high-temperature and high-pressure pipeline materials for power stations, and particularly relates to an on-line testing device for high-temperature and high-pressure pipes for power stations.
Background
Higher thermal efficiency and lower CO of thermal power generating unit2The emission is an important direction for solving two major problems of energy and environment all over the world at present. Improving the steam parameters of the boiler of the thermal power plant is an effective way for improving the efficiency of the thermal generator set. Increasing steam parameters present significant challenges for high temperature materials for boiler tubes. In addition, due to the adjustment of the electric power structure in China, the start, stop and peak regulation operation of domestic thermal power plants are very frequent, and higher requirements are put forward on the safety and stability of materials.
In the research and development process of high-temperature and high-pressure pipeline materials for power stations, in order to research the service performance of the materials, the test means adopted generally comprises a high-temperature creep test, a high-temperature endurance test, a thermal fatigue test, a low/high cycle fatigue test, a high-temperature long-term aging test, a high-temperature oxidation test and the like. These several tests all reflect the performance or texture characteristics of the material under a single specific condition. The service conditions of real power plant materials are very complex, and the difference between the test environment provided by the test means and the real service environment of the materials in the power plant is very large, so that the material organization and performance data reflected by the test means have limitations. For example, in order to accelerate the development progress, high-temperature creep and endurance tests are usually carried out at a temperature and stress higher than the service temperature and stress of a power station, and a standard test bar is adopted to apply unidirectional axial stress, so that the influence of the complicated stress condition of a service pipe and the oxidation of a material in a special service environment on the endurance creep performance is not considered; the cold and hot fatigue test does not take the influence of the complex stress condition of the power station material into consideration; the low \ high cycle fatigue test does not consider the influence of complex stress conditions and service environment; the high-temperature long-term aging test can accurately obtain the structure evolution condition of the material in the high-temperature aging process, but the test is carried out under the stress-free condition, so the influence of the stress on the high-temperature structure evolution of the material is not considered; the steam pressure and temperature adopted by the high-temperature steam oxidation test are lower than the real service environment of the power plant, and the influence of a complex stress state and steam scouring on the oxidation behavior of the material is ignored.
Obtaining test data under a single specific condition has limitations, and thus it is difficult to accurately reflect the actual service performance of the material, resulting in exposure of the material to some problems not found in the laboratory during the service of the power plant. In addition, the relevant data of the organization and performance evolution law of the material in the service process is very important for the research and development of the material and the process and the engineering application thereof, but the data can not be obtained in a laboratory and an in-service power plant at present.
The pipe for the power plant and the welding opening thereof are subjected to service performance test in a service environment, the material organization and performance evolution law and comprehensive performance data are obtained, the understanding of the material can be deepened, the research and development and engineering application progress of the material and the process can be accelerated, and the safety and the reliability of the material in the service process can be improved. Therefore, the design of the test device capable of providing the service environment of the pipe in the power plant has important significance and has very wide application prospect.
Disclosure of Invention
The invention aims to provide a device for the on-line test of high-temperature and high-pressure pipes for a power station, aiming at the defects in the prior art.
The invention is realized by adopting the following technical scheme:
a high-temperature high-pressure pipe online test device for a power station comprises a conveying pipeline, a header, a shunt pipeline, a computer and a water spray desuperheater; the two collecting boxes are respectively connected with a conveying pipeline, and each steam conveying pipeline is provided with a stop valve and an electric control valve;
the two ends of the test tube sample are respectively connected between the two headers through a shunt pipeline, according to test requirements, one group or a plurality of groups of pressure measuring devices, temperature measuring devices and flow measuring devices are arranged on the shunt pipeline, the output ends of the pressure measuring devices, the temperature measuring devices and the flow measuring devices are respectively connected with the input end of a computer, and the output end of the computer is respectively connected with the control ends of the stop valve and the electric control valve.
The invention has the further improvement that the steam-water-spraying temperature-reducing device also comprises a water-spraying temperature-reducing device connected with the conveying pipeline at the steam input end, and the output end of the computer is connected with the control end of the water-spraying temperature-reducing device.
A further improvement of the present invention is that the inlet end of the spray desuperheater is provided with a check valve.
The invention is further improved in that a safety valve is arranged on the delivery pipeline of the steam input end.
A further improvement of the invention is that each header is fitted with a hand hole for decontamination of the device.
The invention has the further improvement that the two headers are both provided with a drain pipeline for starting and stopping drainage.
The invention is further improved in that the diversion pipeline and the test tube sample are arranged into U-shaped bent pipes, so that the expansion stress of the pipeline is reduced.
The invention has the further improvement that the test tube sample can be used for serially welding a plurality of tube samples and is used for the service performance test of the tube and the welding opening.
A further development of the invention is that a plurality of test tube specimens can be provided.
The invention has at least the following beneficial technical effects:
the invention leads high-temperature high-pressure steam in a power plant in service out through a pipeline, is used for testing the service performance of the pipe and the welding opening thereof, obtains the tissue and performance evolution rule and comprehensive performance data of the pipe and the welding opening thereof under the service condition, which cannot be obtained by the conventional test means, deepens the understanding of the material, accelerates the research and development and engineering application progress of the material and process, and improves the safety and reliability of the material in the service process.
The testing device can adjust the on-off, temperature, pressure and flow rate of steam in a test pipe sample, simulate the service environment of a power plant during frequent start-stop and peak-shaving operation, and acquire the service performance of the pipe during frequent start-stop and peak-shaving operation of the power plant. The understanding of the materials is deepened, and the research and development of the materials and the process with high reliability and high stability are accelerated, and the engineering application progress is accelerated.
The steam is converged into a power plant operation system after passing through the test device, is used for generating power or supplying heat, and is energy-saving and environment-friendly.
A stop valve is arranged between the test device and the power plant operation system, so that the connection between the test device and the power plant operation system can be cut off at any time, and the test device is repaired and maintained, and a pipe sample is installed or sampling analysis is carried out. The whole using process of the testing device does not influence the normal operation of the power plant.
Drawings
FIG. 1 is a schematic diagram of an on-line testing device for high-temperature and high-pressure pipes used in a power station.
FIG. 2 is a schematic diagram of the arrangement scheme of the shunt pipeline and the test pipe sample of the high-temperature high-pressure pipe online test device for the power station.
In the figure: the device comprises a steam pipeline, a stop valve, an electric control valve, a safety valve, a collection box, a flow dividing pipeline, a test tube sample, a hand hole, a pressure measuring device, a temperature measuring device, a flow rate measuring device, a computer, a water spray desuperheater, a check valve, a signal transmission line and a drainage pipeline, wherein the steam pipeline comprises 1, the stop valve comprises 2, the electric control valve comprises 3, the safety valve comprises 4, the collection box comprises 5, the flow dividing pipeline comprises 6, a test tube sample comprises 7, a hand.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but these descriptions are merely illustrative and are not intended to limit the scope of the present invention in any way.
As shown in figure 1, the high-temperature high-pressure pipe online testing device for the power station realizes the delivery, collection and distribution of steam through a pipeline and a header, and comprises a steam delivery pipeline 1, a stop valve 2, an electric control valve 3, a safety valve 4, a header 5, a shunt pipe 6, a test pipe sample 7, a hand hole 8, a pressure measuring device 9, a temperature measuring device 10, a flow measuring device 11, a computer 12, a water spray desuperheater 13, a check valve 14, a signal transmission line 15 and a drainage pipeline 16. The steam is conveyed, collected and distributed through the steam conveying pipeline 1, the shunt pipe 6 and the two headers 5; two stop valves 2 control the opening and closing of the steam used by the whole device; the drainage pipelines arranged on the two headers are used for draining water when the device is started and stopped; two control valves 3 control the pressure and flow rate of the steam in the device; a pipe sample to be tested is arranged at the position of the test pipe sample 7; the pressure measuring device 9, the temperature measuring device 10 and the flow measuring speed device 11 collect steam parameters in the device and feed the steam parameters back to the computer 12; the safety valve 4 prevents the device from overpressure, and the water spray desuperheater prevents the device from overtemperature, so that the safety of the device is ensured; the hand hole 8 is used for cleaning dirt in the header; the computer 12 collects steam parameters and plant operating data and controls the stop valve 2, the control valve 3 and the water spray desuperheater.
A plurality of test tube samples 7 in the same state are installed in a series connection mode and a parallel connection mode, the test tube samples 7 are cut regularly to carry out organization and performance evolution analysis, analysis data are integrated, comprehensive performance data of the pipe in the service process are obtained, and materials, process research and development and engineering application of the materials are guided. Through the reasonable arrangement of the shunt pipeline and the experiment pipeline, the pipe samples of various brands and various states can be tested on one test device simultaneously. The steam parameters are measured by the installed temperature measuring, pressure measuring and flow rate measuring devices, and the steam parameters are fed back to the computer to record parameter related data for test data analysis. And analyzing the collected steam parameters by the computer, and controlling the stop valve, the control valve and the water spray desuperheater. The on-off, temperature, flow rate and pressure of steam in the device can be adjusted by controlling the stop valve, the water spray desuperheater and the two control valves on the steam conveying pipeline, and the service environment of a power plant during frequent start-stop and peak-shaving operation is simulated. Stop valves are installed on two sides of the device, so that the connection between the device and a power plant operation system can be cut off when test tubes are cut or installed, and a drain pipeline is installed on the header and used for draining when the device is started and stopped. The production operation of the power plant is not influenced.
The arrangement and the number of the shunt pipelines and the test tube samples can be adjusted according to actual test requirements. However, the distribution pipes 6 and the test tube samples 7 are uniformly and symmetrically arranged and are arranged in a U-shaped installation manner, so that the expansion stress of the device is reduced. Other arrangements are shown for example in fig. 2, but are not limited to both of the pipe arrangements of fig. 1 and 2.
The test device comprises the following specific working steps: high-temperature and high-pressure steam enters a header 5 through a conveying pipeline 1, the header 5 distributes the steam to a shunt pipeline 6, then the steam flows through a test tube sample 7 and is collected into the header 5 through the shunt pipeline, and the steam in the header is conveyed to a power station operation system through the conveying pipeline and is used for acting of a steam turbine or supplying heat. The computer 12 records steam parameters through temperature, pressure and flow rate measuring devices, and regulates the opening and closing, temperature, flow rate and pressure of the steam through the stop valve 2, the desuperheater 13, the control valve 3 and the stop valve 2. When the steam in the device has abnormal conditions such as overpressure or overtemperature, the safety valve or the water spray desuperheater can be started in time to carry out the operation of temperature reduction or pressure relief of the device.
The material test comprises the following specific steps: and (3) welding the pipe to the test pipe sample working section 7 in a series or parallel connection mode, opening the stop valve 2, and conveying the steam of the power plant to a test device. The computer 12 collects and records steam parameters for material service performance analysis through temperature, pressure and flow rate measuring devices. When necessary, the computer 12 is used for controlling the stop valve 2, the water spray desuperheater 13 and the two control valves 2 on the steam conveying pipeline to change the opening and closing, the flow speed, the temperature and the pressure of steam, and the service environment of the pipe during the starting, the stopping and the peak shaving of a power plant can be simulated. And closing the stop valve 2 periodically, opening the drain pipeline 16, cutting the test tube sample to perform organization and performance evolution analysis, welding other tube samples needing to be tested on the cut position, and restarting the test device to restore the service state of the test tube sample. According to the service characteristics of the power plant, a plurality of pipe samples in each state are recommended to be installed, and the pipe samples are cut periodically to carry out organization and performance evolution analysis. And integrating and analyzing the data, obtaining comprehensive performance data of the pipe in the service process, and guiding material and process research and development and engineering application of the material. One test device can be used for simultaneously mounting test tube samples of various alloys in various states, and the service efficiency of the test device is improved.
Claims (10)
1. A high-temperature high-pressure pipe online test device for a power station is characterized by comprising a conveying pipeline (1), a header (5), a shunt pipeline (6), a computer (12) and a water spray desuperheater (13); wherein the content of the first and second substances,
two collecting boxes (5) are arranged, one collecting box serves as a steam input end, the other collecting box serves as a steam output end, a conveying pipeline (1) is connected to each collecting box (5), and a stop valve (2) and an electric control valve (3) are arranged on each steam conveying pipeline (1);
the two ends of the test tube sample (7) are connected between the two headers (5) through a shunt pipeline (6) respectively, a pressure measuring device (9), a temperature measuring device (10) and a flow measuring device (11) are arranged on the shunt pipeline (6), the output ends of the pressure measuring device (9), the temperature measuring device (10) and the flow measuring device (11) are connected with the input end of a computer (12) respectively, and the output end of the computer (12) is connected with the control ends of the stop valve (2) and the electric control valve (3) respectively.
2. The on-line test device for the high-temperature high-pressure pipes used for the power station according to claim 1, characterized by further comprising a water spray desuperheater (13) connected with the conveying pipeline (1) at the steam input end, wherein the output end of the computer (12) is connected with the control end of the water spray desuperheater (13).
3. The on-line testing device for the high-temperature high-pressure pipes used for the power station as claimed in claim 2, characterized in that the inlet end of the water spray desuperheater (13) is provided with a check valve (14).
4. The on-line testing device for the high-temperature and high-pressure pipes used for the power station according to claim 1, characterized in that a safety valve (4) is further arranged on the conveying pipeline (1) at the steam input end.
5. The on-line testing device for high-temperature and high-pressure pipes used in power stations of claim 1 is characterized in that each header (5) is provided with a hand hole (8) for decontamination of the device.
6. The high-temperature high-pressure pipe online testing device for the power station as claimed in claim 1, wherein the two headers (5) are respectively provided with a drain pipe (16) for starting and stopping drainage.
7. The high-temperature high-pressure pipe online testing device for the power station as claimed in claim 1, wherein the shunt pipe (6) and the test tube sample (7) are arranged as a U-shaped elbow to reduce the expansion stress of the pipe.
8. The high-temperature high-pressure pipe online testing device for the power station as claimed in claim 1, wherein the test pipe sample (7) can be used for serially welding a plurality of pipe samples according to test requirements, and is used for testing service performance of pipes and welding openings.
9. The on-line testing device for the high-temperature high-pressure pipes used for the power station as claimed in claim 1, wherein a plurality of test tube samples (7) can be arranged according to test requirements.
10. The on-line testing device for the high-temperature and high-pressure pipes used for the power station as claimed in claim 1, characterized in that one or more groups of devices for measuring temperature (10), pressure (9) and flow rate (11) are arranged on the diversion pipeline (6) according to actual test requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011295953.7A CN112304779A (en) | 2020-11-18 | 2020-11-18 | High-temperature high-pressure pipe service performance online test device for power station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011295953.7A CN112304779A (en) | 2020-11-18 | 2020-11-18 | High-temperature high-pressure pipe service performance online test device for power station |
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| CN112304779A true CN112304779A (en) | 2021-02-02 |
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| CN202011295953.7A Pending CN112304779A (en) | 2020-11-18 | 2020-11-18 | High-temperature high-pressure pipe service performance online test device for power station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986005A (en) * | 2021-03-01 | 2021-06-18 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Creep test method for power station heated surface pipe welding joint |
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2020
- 2020-11-18 CN CN202011295953.7A patent/CN112304779A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986005A (en) * | 2021-03-01 | 2021-06-18 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Creep test method for power station heated surface pipe welding joint |
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