Abstract: With the continuous development of the times, China's modern industry is also constantly developing. Boiler equipment has also been used more and more in the daily production of our society. Safety valves are installed in the boiler. The purpose of the safety valve is to protect the safety and stability of the boiler. However, the boiler still encounters various problems and failures in actual work, such as leakage, leakage and no. Work and so on, once these conditions occur, there is still a certain degree of danger. Therefore, in order to better ensure the safety of the boiler at work, it is necessary to solve some problems that may arise when the boiler is working. Therefore, this paper will explore the problems that often occur in the work of boiler safety valve and then propose some solutions.
Key words: boiler; safety valve; measure 1. Introduction In the daily production process, in order to ensure the safety of the boiler work, a safety valve will be installed on the boiler. The safety valve is widely used in various pressure vessels to the piping system. The safety valve is a very effective protective valve. The main working principle of the boiler safety valve is that if the pressure in the boiler exceeds the maximum bearing capacity of the pressure system, the boiler safety valve will automatically start to release the excess pressure, thus reducing the pressure in the boiler. The value effectively protects the safety of the pressure vessel and the piping system, ensuring stable operation, thus effectively preventing production accidents. If the pressure value in the boiler returns to normal or below normal, then the safety valve It will stop working and shut down.
2. Installation of boiler safety valve 2.1 Installation principle of hot water boiler safety valve When installing safety valve in hot water boiler, the first thing the installer should do is to conduct a full and comprehensive safety test on the safety valve, not only to test the pressure of the valve. Value, but also to sort out a series of corresponding test results, make a list, and then strictly follow the requirements required on the list to test, if the safety valve's seat pressure capacity value is low, then you need to re-do The setting is larger than the value in the actual work. If the seat valve pressure value of the safety valve is large, the actual value of the pen work is also large, but it will not be much larger. In addition, When setting the seat pressure value of the safety valve, it is necessary to install a safety valve at the low value end. It must be perpendicular to the boiler when installing the safety valve. It must be established in the safety valve when performing these tasks. In the case of normal work, in addition to this, the normal operation of the drainage pipe must be ensured, so that there will be no problem when excreting. Off installers during the installation, it covers the situation does not appear frozen pipes, after the completion of more than a few links to the detection of qualified safety valves marked unified text or symbols, so as not to confuse.
2.2 Installation principle of steam boiler safety valve When installing a safety valve, the installer needs to ensure that the safety valve of the boiler is a low pressure value. Therefore, when installing the valve, the installer needs to configure a set of exhaust pipe for the safety valve. Also ensure the venting of the exhaust pipe so that it does not affect the exhaust of the exhaust pipe, and the safety valve is also installed at the topmost position of the steam boiler. As with hot water boilers, the safety valves of steam boilers are also kept perpendicular to the boiler during installation. In addition, the safety valve should not be placed too far away from the relevant protective equipment, so that protection can be provided in a timely manner.
3. Safety valve valve common fault analysis and solution 3.1 Safety valve valve leakage leakage Safety valve valve leakage is one of the more common failures of boilers in daily production. The cause of the failure is that the boiler is in normal working hours and the pressure is also Normal, but there is a gap between the disc and the seat, causing a leak. There are three main reasons for the leak:
The first point is that when the valve is working, it will produce some dirt and impurities, which will cause gaps and cause leakage. The main solution is to regularly remove the dirt and impurities in the valve. Generally, when the boiler is not working for maintenance, it can effectively prevent leakage after it is removed.
The second point is that the seal of the valve may be damaged. The reasons for the damage may be as follows: The first point may be that the material in the sealed place is not working. For example, due to the long-term maintenance of the boiler, the valve core and the valve seat have been studied very low, resulting in a greatly reduced hardness of the cover material, thereby reducing the seal and causing leakage. A better solution is to place the original place. Cut it down, then redesign it and re-surge it. The second point may be that the quality of the repair is too poor, and some of the core parts do not meet the normal quality standards, resulting in leakage. At this time, it is necessary to re-install the parts with the quality of the standard.
The third point is that the dimensions between some of the assembled parts do not match well. In the process of assembly, due to the mismatch between the parts, a gap is formed, and the sealing property is greatly reduced. The main solution is to check for an fit between the parts to ensure that there is no looseness between the parts leading to leakage.
3.2 The pressure of the safety valve valve back to the seat is too low. When the pressure of the valve back to the seat is too low, a large amount of medium will be over-discharged, resulting in unnecessary waste of resources. The main cause of this phenomenon is on the safety valve. The amount of steam is very large. If the safety valve is opened, the medium will be discharged continuously, which will affect the valve body. In addition, this form of displacement will affect the sealing of the safety valve. The larger the discharge, the greater the pressure, thus raising the spool, and the safety valve will continue to discharge. The main solution is to turn the throttle off to a small point, which reduces the discharge of the medium and reduces the pressure on the safety valve.
3.3 Safety valve valve moving parts appear jamming This phenomenon may be caused by improper operation of the safety valve when assembling, causing dirt and impurities to mix into the safety valve or corrosion of the parts, the surface of the piston Not clean enough, causing surface damage, so that some grooves and hard spots appear. For these reasons, the friction between the moving parts and the fixed twentieth is increasing, so that it is easy to cause the safety door to refuse to move under the other conditions. If this situation is to be solved, the pistons and the like should be derusted during the inspection, the grooves in the piston chamber should be filled smoothly, and the safety valve should be assembled in strict order. In the boiler water pressure test, the pulse tube is flushed, and then the main safety door is connected to the impulse valve to maintain normal operation.
4. Safety valve The problem that needs to be paid attention to during maintenance and repair If the safety valve is to be operated normally during operation, then the safety valve must have good sealing. This requires attention to a few points:
The first point is that the boiler safety valve usually has a lot of dust when it is installed. For example, when the safety valve is covered with a protective cover, when the safety valve is installed with a rain cover and a sealing cover, if there is dust inside, then It will cause blockage and affect the normal operation of the container. Therefore, the installer needs to remove the dust in time, and tighten the screw of the safety valve to prevent the screw from loosening.
The second point is that if the relevant staff finds a leak in the safety valve, then it is necessary to find the cause of the leak in time. If the valve is not sufficiently sealed, such as debris, then the safety valve is required to be vented. If damage occurs in the place where the safety valve is combined, repairs are required. In the event of a malfunction, do not arbitrarily tighten the screws to prevent leakage, which will be counterproductive.
The third point is that the relevant staff should regularly repair the safety valve. It is necessary to check in detail whether there is damage or deformation in the safety valve. If it exists, it should be repaired in time. Some defective areas should be detected and filled in time to achieve a smooth surface. The solenoid valve needs to be replaced after a period of time to ensure the normal operation of the machine.
The fourth point is that some parts should be placed in the position of the design at the time of assembly. It must be strictly in accordance with the standard, where to place where it is placed, and keep the pipes in the exhaust pipe clean and tidy.
5. Summary In summary, the operator can only ensure the safety and stability of the boiler by solving some faults of the boiler safety valve only by timely and effective prevention of weapons. The staff needs to analyze the cause of the fault in detail, find the root of the problem and formulate a detailed solution, and give full play to the role of the safety valve. In the daily production process, the staff should also carry out strict inspection and maintenance frequently, thus effectively reducing the probability of failure of the safety valve.
References [1] Mi Zhen. Analysis of common faults and maintenance measures of boiler safety valve [J]. SME Management and Technology (late issue), 2010 (07): 276.
[2] Sun Tinghong, Wu Kaifei. Common Problems of Safety Valves in Safe Operation of Boilers and Their Test Analysis [J]. Chemical Industry Management, 2018(21): 66-67.
[3] Yang Feilong. Research on Key Technologies of Fault and Treatment of Boiler Safety Valves[J]. Chemical Industry Management, 2017(32): 216.
[4]Gu Yanjun, Yang Shiyi. Pentair China Safety Valve Steam Test Center has obtained ASME V certification Pentair valve and control for the safety valve users to provide a true one-stop product supply from production to testing and certification [J]. Mechanical Manufacturing, 2015, 53 (02): 84.
[5] Zhu Gangliang, Yang Yu, Chang Ting. Technical improvement of main steam safety valve of a nuclear power plant and its impact on operation [J]. Science and Technology Vision, 2016 (23): 243-244.
(Author: Guangdong Shaoguan Yuejiang Power Generation Co., Ltd.)
Key words: boiler; safety valve; measure 1. Introduction In the daily production process, in order to ensure the safety of the boiler work, a safety valve will be installed on the boiler. The safety valve is widely used in various pressure vessels to the piping system. The safety valve is a very effective protective valve. The main working principle of the boiler safety valve is that if the pressure in the boiler exceeds the maximum bearing capacity of the pressure system, the boiler safety valve will automatically start to release the excess pressure, thus reducing the pressure in the boiler. The value effectively protects the safety of the pressure vessel and the piping system, ensuring stable operation, thus effectively preventing production accidents. If the pressure value in the boiler returns to normal or below normal, then the safety valve It will stop working and shut down.
2. Installation of boiler safety valve 2.1 Installation principle of hot water boiler safety valve When installing safety valve in hot water boiler, the first thing the installer should do is to conduct a full and comprehensive safety test on the safety valve, not only to test the pressure of the valve. Value, but also to sort out a series of corresponding test results, make a list, and then strictly follow the requirements required on the list to test, if the safety valve's seat pressure capacity value is low, then you need to re-do The setting is larger than the value in the actual work. If the seat valve pressure value of the safety valve is large, the actual value of the pen work is also large, but it will not be much larger. In addition, When setting the seat pressure value of the safety valve, it is necessary to install a safety valve at the low value end. It must be perpendicular to the boiler when installing the safety valve. It must be established in the safety valve when performing these tasks. In the case of normal work, in addition to this, the normal operation of the drainage pipe must be ensured, so that there will be no problem when excreting. Off installers during the installation, it covers the situation does not appear frozen pipes, after the completion of more than a few links to the detection of qualified safety valves marked unified text or symbols, so as not to confuse.
2.2 Installation principle of steam boiler safety valve When installing a safety valve, the installer needs to ensure that the safety valve of the boiler is a low pressure value. Therefore, when installing the valve, the installer needs to configure a set of exhaust pipe for the safety valve. Also ensure the venting of the exhaust pipe so that it does not affect the exhaust of the exhaust pipe, and the safety valve is also installed at the topmost position of the steam boiler. As with hot water boilers, the safety valves of steam boilers are also kept perpendicular to the boiler during installation. In addition, the safety valve should not be placed too far away from the relevant protective equipment, so that protection can be provided in a timely manner.
3. Safety valve valve common fault analysis and solution 3.1 Safety valve valve leakage leakage Safety valve valve leakage is one of the more common failures of boilers in daily production. The cause of the failure is that the boiler is in normal working hours and the pressure is also Normal, but there is a gap between the disc and the seat, causing a leak. There are three main reasons for the leak:
The first point is that when the valve is working, it will produce some dirt and impurities, which will cause gaps and cause leakage. The main solution is to regularly remove the dirt and impurities in the valve. Generally, when the boiler is not working for maintenance, it can effectively prevent leakage after it is removed.
The second point is that the seal of the valve may be damaged. The reasons for the damage may be as follows: The first point may be that the material in the sealed place is not working. For example, due to the long-term maintenance of the boiler, the valve core and the valve seat have been studied very low, resulting in a greatly reduced hardness of the cover material, thereby reducing the seal and causing leakage. A better solution is to place the original place. Cut it down, then redesign it and re-surge it. The second point may be that the quality of the repair is too poor, and some of the core parts do not meet the normal quality standards, resulting in leakage. At this time, it is necessary to re-install the parts with the quality of the standard.
The third point is that the dimensions between some of the assembled parts do not match well. In the process of assembly, due to the mismatch between the parts, a gap is formed, and the sealing property is greatly reduced. The main solution is to check for an fit between the parts to ensure that there is no looseness between the parts leading to leakage.
3.2 The pressure of the safety valve valve back to the seat is too low. When the pressure of the valve back to the seat is too low, a large amount of medium will be over-discharged, resulting in unnecessary waste of resources. The main cause of this phenomenon is on the safety valve. The amount of steam is very large. If the safety valve is opened, the medium will be discharged continuously, which will affect the valve body. In addition, this form of displacement will affect the sealing of the safety valve. The larger the discharge, the greater the pressure, thus raising the spool, and the safety valve will continue to discharge. The main solution is to turn the throttle off to a small point, which reduces the discharge of the medium and reduces the pressure on the safety valve.
3.3 Safety valve valve moving parts appear jamming This phenomenon may be caused by improper operation of the safety valve when assembling, causing dirt and impurities to mix into the safety valve or corrosion of the parts, the surface of the piston Not clean enough, causing surface damage, so that some grooves and hard spots appear. For these reasons, the friction between the moving parts and the fixed twentieth is increasing, so that it is easy to cause the safety door to refuse to move under the other conditions. If this situation is to be solved, the pistons and the like should be derusted during the inspection, the grooves in the piston chamber should be filled smoothly, and the safety valve should be assembled in strict order. In the boiler water pressure test, the pulse tube is flushed, and then the main safety door is connected to the impulse valve to maintain normal operation.
4. Safety valve The problem that needs to be paid attention to during maintenance and repair If the safety valve is to be operated normally during operation, then the safety valve must have good sealing. This requires attention to a few points:
The first point is that the boiler safety valve usually has a lot of dust when it is installed. For example, when the safety valve is covered with a protective cover, when the safety valve is installed with a rain cover and a sealing cover, if there is dust inside, then It will cause blockage and affect the normal operation of the container. Therefore, the installer needs to remove the dust in time, and tighten the screw of the safety valve to prevent the screw from loosening.
The second point is that if the relevant staff finds a leak in the safety valve, then it is necessary to find the cause of the leak in time. If the valve is not sufficiently sealed, such as debris, then the safety valve is required to be vented. If damage occurs in the place where the safety valve is combined, repairs are required. In the event of a malfunction, do not arbitrarily tighten the screws to prevent leakage, which will be counterproductive.
The third point is that the relevant staff should regularly repair the safety valve. It is necessary to check in detail whether there is damage or deformation in the safety valve. If it exists, it should be repaired in time. Some defective areas should be detected and filled in time to achieve a smooth surface. The solenoid valve needs to be replaced after a period of time to ensure the normal operation of the machine.
The fourth point is that some parts should be placed in the position of the design at the time of assembly. It must be strictly in accordance with the standard, where to place where it is placed, and keep the pipes in the exhaust pipe clean and tidy.
5. Summary In summary, the operator can only ensure the safety and stability of the boiler by solving some faults of the boiler safety valve only by timely and effective prevention of weapons. The staff needs to analyze the cause of the fault in detail, find the root of the problem and formulate a detailed solution, and give full play to the role of the safety valve. In the daily production process, the staff should also carry out strict inspection and maintenance frequently, thus effectively reducing the probability of failure of the safety valve.
References [1] Mi Zhen. Analysis of common faults and maintenance measures of boiler safety valve [J]. SME Management and Technology (late issue), 2010 (07): 276.
[2] Sun Tinghong, Wu Kaifei. Common Problems of Safety Valves in Safe Operation of Boilers and Their Test Analysis [J]. Chemical Industry Management, 2018(21): 66-67.
[3] Yang Feilong. Research on Key Technologies of Fault and Treatment of Boiler Safety Valves[J]. Chemical Industry Management, 2017(32): 216.
[4]Gu Yanjun, Yang Shiyi. Pentair China Safety Valve Steam Test Center has obtained ASME V certification Pentair valve and control for the safety valve users to provide a true one-stop product supply from production to testing and certification [J]. Mechanical Manufacturing, 2015, 53 (02): 84.
[5] Zhu Gangliang, Yang Yu, Chang Ting. Technical improvement of main steam safety valve of a nuclear power plant and its impact on operation [J]. Science and Technology Vision, 2016 (23): 243-244.
(Author: Guangdong Shaoguan Yuejiang Power Generation Co., Ltd.)
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