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In the development of thermal power plants, the internal leakage of the thermal system valves directly affects the development. Therefore, thermal power plants should actively know the causes of internal leakage of valves in the production process. Before production, timely check the corresponding equipment to clean up the dirt existing in them to ensure the automation of thermal power plant valves. In the process of starting the related equipment, the condensate cannot be recovered. It is necessary to strictly control the quality of the valve, do a good job in the operation of the valve in series, check the temperature of the valve regularly, and adjust the switch properly, which can prevent the valve from leaking. The influence of the valve's internal leakage on thermal power plants, judgment method, prevention and control measures of the valve internal leakage are explained in this article.
 
The internal leakage of the valve is a common problem in the production of current thermal power plants. Only by ensuring that the internal leakage does not occur for the valve, can energy be saved and energy waste reduced. Actively understanding the causes of the valve's internal leakage has a very important impact on the operation of the thermal power plant. Mastering the causes of the internal leakage of valves in thermal power plants and putting forward corresponding preventive measures can lay a good foundation for reducing the internal leakage of valves.
 
1. The influence of the internal leakage of the valve on thermal power plants
1.1 The impact on safety production
In the operation of thermal power plants, safety production has always been the key. If thermal power plants do not follow safe production, the economic benefits of thermal power plants cannot be effectively guaranteed. If there is internal leakage in the valve, the related equipment of the thermal power plant will not be able to be used. At present, the lack of corresponding safety measures cannot effectively guarantee the personal safety of maintenance personnel.
 
1.2 The impact on economic benefits
A leak in a valve in a thermal power plant can cause the chemicals produced in it to be released directly into the atmosphere, or the high-temperature treated substances are discharged into the condenser before being used, which in turn increases the heat load of the condenser and reduces the production efficiency of the thermal power plant. Because of the problem of internal leakage of the valve, the corresponding measures could not be provided in time, or it could not be repaired at first, resulting in poor work efficiency during the operation of the unit and being unable to obtain good economic benefits. For example, for overhead steel pipes, if there is an internal leak and it cannot be repaired in time, which will lead to an increase in the amount of coal burning. If the operation cannot be stopped in time, it will lead to the presence of cold water in the steam turbine, resulting in a high-security risk.
 
1.3 The impact on social image
In the process of operation, thermal power plants not only need to obtain corresponding economic benefits, but also bear the relevant responsibilities of social development. If the internal leakage happens for the valve, it will cause a part of the high-temperature and high-pressure water to be directly discharged into the atmosphere, thereby causing pollution to the environment. The internal leakage of the valve is also closely related to the management efficiency of thermal power plants, and low management efficiency is one of the reasons for the internal leakage of the valve.
 
2. Judgment methods of the internal leakage of the valve
Close the valve for 6 hours, and then use an infrared thermometer to measure the temperature of its valve stem. If the measured temperature is found to be greater than 70°C, it shows that the internal leakage of the valve occurs. This method is relatively accurate, but there will be some problems in the working process. First, it is the installation location of the pipeline. As a result, some valves will be affected by high temperatures, so that the temperature of the valve will be above 70°C even if there is no internal leakage. Therefore, other methods should be used. For example, if the valve is near the high temperature, then use the comparison between the high side and the high discharge temperature to know whether there is an internal leakage on the high side. Second, in the case of the drain gates being connected side by side, if the position of the last valve is close to the main pipe, the temperature of the other valves will exceed 70°C as long as the internal leakage occurs for one of the pipes. Therefore, for judging the internal leakage of these valves, the corresponding method should be used to ensure that the internal leakage is checked through the temperature measurement of the valve stem.