ã€Abstract】The valve of power station has the characteristics of high temperature and high pressure because of the special work. The main purpose is to cut off or connect the pipeline medium to achieve the purpose of protecting the power station equipment. With the gradual improvement of people's economic level, people's demand for electricity is getting bigger and bigger, and the demand for power stations is getting higher and higher. In order to ensure the normal power supply of the enterprise, the power station enterprise must ensure the safe operation of the power station equipment, and put forward higher requirements for the valve manufacturing quality. The good valve manufacturing quality can ensure the normal operation of the power station equipment, so the in-depth study of the control valve manufacturing The quality level has a very high practical significance. Starting from the characteristics of power station valves, this paper puts forward the quality control measures of power station valves, in order to provide reference and reference for relevant researchers to ensure the quality of valve manufacturing and provide great guarantee for the safe operation of power station equipment.
[Keywords] valve quality power plant equipment safe operation For the power station, the manufacturing quality of the valve is very important, the valve manufacturing quality is high, in order to provide a high guarantee for the equipment running in the power station, to ensure that the power station enterprise can operate normally, It will not affect the normal power supply of the enterprise due to circuit failure, thus causing great losses to the enterprise. The main function of the power station valve is to switch on or off the flow of the pipeline medium, thus changing the flow direction of the medium, so as to achieve the purpose of regulating the pressure and flow of the medium, and providing a high guarantee for the safe operation of the power station equipment. The main problem of valve manufacturing quality today is the localization of the corresponding component materials. Only by effectively solving this problem can the quality of the valve manufacturing be ensured, thus preventing the failure of the power plant equipment.
First, the characteristics of the power station valve (a) a large number of power plant valves, the main function is to cut or turn on the pipeline media, is a kind of media conveying equipment. Therefore, it is an indispensable equipment for power station enterprises, and in order to ensure that its own enterprises can provide uninterrupted power supply, the power station will inevitably use a large number of valves to provide great guarantee for the normal operation of the equipment. According to statistics, the sum of all valves in a small and medium-sized power station enterprise is as high as 50,000. (2) There are many types of various types of power stations, including gate valves, globe valves, check valves, butterfly valves, safety valves, and main steam isolation valves. Ball valves, diaphragm valves, pressure reducing valves and control valves, etc., respectively control all aspects of the power supply process, and different types of valves are also available in various models, such as butterfly valves, there are three types, namely seawater-lined rubber butterfly valve, rubber sealing butterfly valve and metal hard Seal the butterfly valve.
(3) Requirements for high-power station valves Because of the special nature of the working environment and its importance, power station companies have very high requirements and standards for valves. In the cooling system, the valve can be cooled because some radioactive substances are released during the cooling process. Therefore, in order to prevent the leakage of the radiating material, it is necessary to ensure the sealing of the valve and good sealing. The radiation leakage of the material is completely avoided, and the safety and stability of the valve are also higher.
II. Quality control measures for power station valves (I) Control of raw materials When the raw materials purchased by the power station enter the factory, the relevant person in charge of the power station must conduct a rigorous review of the raw materials entering the plant, check the raw materials according to the purchase list, and put the paper into the factory. The quality report and the physical object are carefully checked to ensure that the raw materials meet the relevant production requirements. After the inventory is correct, the raw materials are sorted for different uses of different parts, which saves a lot of time for subsequent valve manufacturing. When inspecting the opening documents, focus on inspection of procurement contracts, technical agreements, and so on. The following may occur during the inspection:
(1) Although the chemical composition and mechanical properties are different, the certificate number of the raw material is one. There are three reasons for this: The first reason is that the chemical composition of the raw materials is incomplete and there is a lack of items. The second reason is that the relevant responsible department did not follow the standard process when performing performance testing, and there are also missing items. The third reason is that the performance test of some projects requires sampling on the highest and lowest hardness materials during sampling, but it is not sampled as required during the actual sampling process, but is randomly sampled.
(2) There are many certificates of material and there is no signature from the supplier tester or the relevant approver. There are three reasons for this: The first reason is that the procurement of materials is the responsibility of the manufacturer, but in the control and management, it does not pay attention to inspection and experimental projects, so the approval of materials is neglected. The second reason is that the manufacturer did not purchase the raw materials at the time of the contract. The third reason is that there are very significant quality problems on the surface of the casting material.
(II) Control of the production process The production process mainly includes heat treatment, welding, non-destructive testing and hydraulic testing. Therefore, the control of the production process is the control of these links.
For the heat treatment, the possible problems are that the control parameters of the heat treatment do not meet the requirements of the relevant regulations, or the technology for heat treatment does not meet the relevant standards and requirements. The valve production process does not require all the parts to be heat treated, but some power plants are not familiar with them, so some parts that do not need to be heat treated are heat treated, which destroys the molecular structure of the parts to some extent. It is prone to quality problems. Therefore, in order to better control the heat treatment process, suppliers should pay attention to the quality of the process documents, and record the detailed regulations and requirements of the parts, which greatly reduces the occurrence of leakage in the heat treatment.
For welding, before the welding, the relevant person in charge should carefully inspect the technical ability of the welding personnel and the welding equipment, not only to check the technical certificate of the welding personnel, but also to weld the welding machine, welding consumables, welding bodies, etc. All welding devices are carefully inspected. In the welding process, the attention should be paid to the specifications of the welding consumables used in different welding layers and the corresponding inter-layer temperature. The welding of different parts also has different temperature requirements. Therefore, attention should be paid to the welding temperature to ensure the welding. quality.
For non-destructive testing, the sealing surface of the valve must be non-destructively tested to see if the sealing surface of the valve is infiltrated. When performing non-destructive testing, you may encounter two problems: The first problem is that the environmental conditions of non-destructive testing do not meet the relevant requirements. For example, when the osmosis sealing surface penetration test is performed in winter, the temperature is lower than the requirement, and the manufacturer performs the penetration test without taking heating measures. The second problem is that the surface cleaning is not clean after non-destructive testing. Due to the large number of valves, the formulation will flow downward after the penetration test is not cleaned. In order to better control the quality of the non-destructive testing process, the supervisor should communicate with the manufacturer in a timely manner, and improve the non-destructive testing personnel to complete the required non-destructive testing work as required.
For the water pressure test, we should pay attention to the following aspects: 1 The quality of the test water. The most important part of the hydraulic test is water. If the quality of the water is not effectively guaranteed, the quality of the hydraulic test will be affected to some extent, which will distort the test results and cause the hydraulic test to not really work. 2 The accuracy of the pressure gauge. Under normal circumstances, the accuracy of the pressure gauge is 1.5 or less, and after the hydraulic pressure test, the pressure gauge should be dried and sealed accordingly. If the drying and sealing after the test are not emphasized, the precision of the pressure gauge will be affected. Degree, which affects the results of the hydrostatic test. 3 valve switching time. Different functions of the valve, the switch time is also different, so in the design of the drawings must be clear about the function of each valve, the function of the valve to design the valve switch time. When the valve is subjected to a functional test, if it is equipped with an electric or pneumatic actuator, it is necessary to increase the witness during the functional test. Carefully check the technical specifications and drawings in the process of functional testing to ensure the accuracy of the test results to a great extent. (III) Control of the final link At the final stage, the key review is the drawing of the valve, carefully confirm the various data on the drawing and the calculation results, and carefully check the valve size, channel cavity and other contents. The calculations are subject to repeated calculations to ensure the accuracy of the valve drawings and fundamentally control the quality of the valves. If it is a stainless steel valve, check the inside of the valve housing for foreign matter in the final part. Because the stainless steel valve has no way to apply anti-rust oil, pay special attention to the cleaning inside the valve housing after the hydrostatic test. There are other foreign objects inside the valve housing.
(IV) When the control report of the completion report controls the quality of the power plant valve manufacturing, in addition to the strict review of the physical object of the valve, it is necessary to conduct a rigorous review of the relevant documents, especially the completion report of the valve. Many manufacturers are not aware of the specific requirements of the completion report, resulting in a large difference between the physical and completion reports of the valve, resulting in many problems in the production process, such as incomplete content of the completed documents, clerical errors in the report or unclear content, etc. To some extent affect the quality of the valve. Therefore, in order to avoid this situation, the relevant person in charge of the power station should communicate with the manufacturer in a timely manner to confirm the contents of the completion report, so that the completion report can be submitted in time, so as not to affect the production efficiency and quality of the valve. .
Conclusion The quality of the power station valve is especially important for the power station enterprise. Therefore, the power station enterprise must pay attention to the valve manufacturing process to ensure the quality of each link in the manufacturing process to ensure the quality of the valve, thus providing the normal operation of the power station equipment. Great protection. The inability to strictly control the quality of valve manufacturing is likely to have particularly serious consequences, and many power station companies may face closures. Therefore, power station enterprises must pay attention to controlling the quality of valve manufacturing to ensure the safe operation of power station equipment, and fundamentally eliminate the occurrence of risks.
references:
[1]Wang Zhanzhou. How to Improve the Reliability of Urban Power Supply and Consumption——Based on the Design of High Pressure Differential Valves for Power Stations[J]. Decision Making Exploration (ä¸), 2017.
[2] Sun Jianjian. How to control the quality of valve manufacturing to ensure the safe operation of power station equipment [J]. Science and Technology Innovation and Application, 2017.
[3] Che Jun, Liu Lin, Guo Shoufeng. Discussion on improving the reliability of power station equipment [J]. Hydropower and New Energy, 2016.
[4] International advanced level of turbine reheat valve connection in a million kilowatt nuclear power plant [J]. General Machinery, 2014 (09).
[5] Shi Li. Intelligent power distribution management system solution for switching equipment of power station [J]. Equipment Machinery, 2014.
[6] Feng Jisheng, Zhang Meng. Control valve manufacturing quality to ensure safe operation of power station equipment [J]. Equipment Management and Maintenance, 2014.
[7] Liang Shen, Reliability Risk Identification and Evaluation of Main Equipment Manufacturing Projects of Large Power Plants [J]. Coal Technology, 2013.
[Keywords] valve quality power plant equipment safe operation For the power station, the manufacturing quality of the valve is very important, the valve manufacturing quality is high, in order to provide a high guarantee for the equipment running in the power station, to ensure that the power station enterprise can operate normally, It will not affect the normal power supply of the enterprise due to circuit failure, thus causing great losses to the enterprise. The main function of the power station valve is to switch on or off the flow of the pipeline medium, thus changing the flow direction of the medium, so as to achieve the purpose of regulating the pressure and flow of the medium, and providing a high guarantee for the safe operation of the power station equipment. The main problem of valve manufacturing quality today is the localization of the corresponding component materials. Only by effectively solving this problem can the quality of the valve manufacturing be ensured, thus preventing the failure of the power plant equipment.
First, the characteristics of the power station valve (a) a large number of power plant valves, the main function is to cut or turn on the pipeline media, is a kind of media conveying equipment. Therefore, it is an indispensable equipment for power station enterprises, and in order to ensure that its own enterprises can provide uninterrupted power supply, the power station will inevitably use a large number of valves to provide great guarantee for the normal operation of the equipment. According to statistics, the sum of all valves in a small and medium-sized power station enterprise is as high as 50,000. (2) There are many types of various types of power stations, including gate valves, globe valves, check valves, butterfly valves, safety valves, and main steam isolation valves. Ball valves, diaphragm valves, pressure reducing valves and control valves, etc., respectively control all aspects of the power supply process, and different types of valves are also available in various models, such as butterfly valves, there are three types, namely seawater-lined rubber butterfly valve, rubber sealing butterfly valve and metal hard Seal the butterfly valve.
(3) Requirements for high-power station valves Because of the special nature of the working environment and its importance, power station companies have very high requirements and standards for valves. In the cooling system, the valve can be cooled because some radioactive substances are released during the cooling process. Therefore, in order to prevent the leakage of the radiating material, it is necessary to ensure the sealing of the valve and good sealing. The radiation leakage of the material is completely avoided, and the safety and stability of the valve are also higher.
II. Quality control measures for power station valves (I) Control of raw materials When the raw materials purchased by the power station enter the factory, the relevant person in charge of the power station must conduct a rigorous review of the raw materials entering the plant, check the raw materials according to the purchase list, and put the paper into the factory. The quality report and the physical object are carefully checked to ensure that the raw materials meet the relevant production requirements. After the inventory is correct, the raw materials are sorted for different uses of different parts, which saves a lot of time for subsequent valve manufacturing. When inspecting the opening documents, focus on inspection of procurement contracts, technical agreements, and so on. The following may occur during the inspection:
(1) Although the chemical composition and mechanical properties are different, the certificate number of the raw material is one. There are three reasons for this: The first reason is that the chemical composition of the raw materials is incomplete and there is a lack of items. The second reason is that the relevant responsible department did not follow the standard process when performing performance testing, and there are also missing items. The third reason is that the performance test of some projects requires sampling on the highest and lowest hardness materials during sampling, but it is not sampled as required during the actual sampling process, but is randomly sampled.
(2) There are many certificates of material and there is no signature from the supplier tester or the relevant approver. There are three reasons for this: The first reason is that the procurement of materials is the responsibility of the manufacturer, but in the control and management, it does not pay attention to inspection and experimental projects, so the approval of materials is neglected. The second reason is that the manufacturer did not purchase the raw materials at the time of the contract. The third reason is that there are very significant quality problems on the surface of the casting material.
(II) Control of the production process The production process mainly includes heat treatment, welding, non-destructive testing and hydraulic testing. Therefore, the control of the production process is the control of these links.
For the heat treatment, the possible problems are that the control parameters of the heat treatment do not meet the requirements of the relevant regulations, or the technology for heat treatment does not meet the relevant standards and requirements. The valve production process does not require all the parts to be heat treated, but some power plants are not familiar with them, so some parts that do not need to be heat treated are heat treated, which destroys the molecular structure of the parts to some extent. It is prone to quality problems. Therefore, in order to better control the heat treatment process, suppliers should pay attention to the quality of the process documents, and record the detailed regulations and requirements of the parts, which greatly reduces the occurrence of leakage in the heat treatment.
For welding, before the welding, the relevant person in charge should carefully inspect the technical ability of the welding personnel and the welding equipment, not only to check the technical certificate of the welding personnel, but also to weld the welding machine, welding consumables, welding bodies, etc. All welding devices are carefully inspected. In the welding process, the attention should be paid to the specifications of the welding consumables used in different welding layers and the corresponding inter-layer temperature. The welding of different parts also has different temperature requirements. Therefore, attention should be paid to the welding temperature to ensure the welding. quality.
For non-destructive testing, the sealing surface of the valve must be non-destructively tested to see if the sealing surface of the valve is infiltrated. When performing non-destructive testing, you may encounter two problems: The first problem is that the environmental conditions of non-destructive testing do not meet the relevant requirements. For example, when the osmosis sealing surface penetration test is performed in winter, the temperature is lower than the requirement, and the manufacturer performs the penetration test without taking heating measures. The second problem is that the surface cleaning is not clean after non-destructive testing. Due to the large number of valves, the formulation will flow downward after the penetration test is not cleaned. In order to better control the quality of the non-destructive testing process, the supervisor should communicate with the manufacturer in a timely manner, and improve the non-destructive testing personnel to complete the required non-destructive testing work as required.
For the water pressure test, we should pay attention to the following aspects: 1 The quality of the test water. The most important part of the hydraulic test is water. If the quality of the water is not effectively guaranteed, the quality of the hydraulic test will be affected to some extent, which will distort the test results and cause the hydraulic test to not really work. 2 The accuracy of the pressure gauge. Under normal circumstances, the accuracy of the pressure gauge is 1.5 or less, and after the hydraulic pressure test, the pressure gauge should be dried and sealed accordingly. If the drying and sealing after the test are not emphasized, the precision of the pressure gauge will be affected. Degree, which affects the results of the hydrostatic test. 3 valve switching time. Different functions of the valve, the switch time is also different, so in the design of the drawings must be clear about the function of each valve, the function of the valve to design the valve switch time. When the valve is subjected to a functional test, if it is equipped with an electric or pneumatic actuator, it is necessary to increase the witness during the functional test. Carefully check the technical specifications and drawings in the process of functional testing to ensure the accuracy of the test results to a great extent. (III) Control of the final link At the final stage, the key review is the drawing of the valve, carefully confirm the various data on the drawing and the calculation results, and carefully check the valve size, channel cavity and other contents. The calculations are subject to repeated calculations to ensure the accuracy of the valve drawings and fundamentally control the quality of the valves. If it is a stainless steel valve, check the inside of the valve housing for foreign matter in the final part. Because the stainless steel valve has no way to apply anti-rust oil, pay special attention to the cleaning inside the valve housing after the hydrostatic test. There are other foreign objects inside the valve housing.
(IV) When the control report of the completion report controls the quality of the power plant valve manufacturing, in addition to the strict review of the physical object of the valve, it is necessary to conduct a rigorous review of the relevant documents, especially the completion report of the valve. Many manufacturers are not aware of the specific requirements of the completion report, resulting in a large difference between the physical and completion reports of the valve, resulting in many problems in the production process, such as incomplete content of the completed documents, clerical errors in the report or unclear content, etc. To some extent affect the quality of the valve. Therefore, in order to avoid this situation, the relevant person in charge of the power station should communicate with the manufacturer in a timely manner to confirm the contents of the completion report, so that the completion report can be submitted in time, so as not to affect the production efficiency and quality of the valve. .
Conclusion The quality of the power station valve is especially important for the power station enterprise. Therefore, the power station enterprise must pay attention to the valve manufacturing process to ensure the quality of each link in the manufacturing process to ensure the quality of the valve, thus providing the normal operation of the power station equipment. Great protection. The inability to strictly control the quality of valve manufacturing is likely to have particularly serious consequences, and many power station companies may face closures. Therefore, power station enterprises must pay attention to controlling the quality of valve manufacturing to ensure the safe operation of power station equipment, and fundamentally eliminate the occurrence of risks.
references:
[1]Wang Zhanzhou. How to Improve the Reliability of Urban Power Supply and Consumption——Based on the Design of High Pressure Differential Valves for Power Stations[J]. Decision Making Exploration (ä¸), 2017.
[2] Sun Jianjian. How to control the quality of valve manufacturing to ensure the safe operation of power station equipment [J]. Science and Technology Innovation and Application, 2017.
[3] Che Jun, Liu Lin, Guo Shoufeng. Discussion on improving the reliability of power station equipment [J]. Hydropower and New Energy, 2016.
[4] International advanced level of turbine reheat valve connection in a million kilowatt nuclear power plant [J]. General Machinery, 2014 (09).
[5] Shi Li. Intelligent power distribution management system solution for switching equipment of power station [J]. Equipment Machinery, 2014.
[6] Feng Jisheng, Zhang Meng. Control valve manufacturing quality to ensure safe operation of power station equipment [J]. Equipment Management and Maintenance, 2014.
[7] Liang Shen, Reliability Risk Identification and Evaluation of Main Equipment Manufacturing Projects of Large Power Plants [J]. Coal Technology, 2013.
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