Gas Turbine Power Plant FAQ Edit

Gas Turbine Power Plant FAQ edit

During the operation of the Gas Turbine Power Plant, Gas Turbine Power Plant leakage and cylinder deformation are the most common equipment problems. The tightness of the joint surface of the cylinder directly affects the safe and economic operation of the unit. The maintenance and scraping of the joint surface of the cylinder makes it tight. Important work, in the process of dealing with the steam leakage of the joint surface, it is necessary to carefully analyze the cause of formation. According to the degree of deformation and the size of the gap, various methods can be comprehensively used to meet the strict requirements of the joint surface.

Reasons for cylinder leakage

1. The cylinder is made by casting. After the cylinder leaves the factory, it must undergo aging treatment, which is to store it for some time so that the internal stress generated by the cylinder during the casting process is completely eliminated. If the aging time is short, the processed cylinders will be deformed in the future operation, which is why some cylinders will still have steam leakage in the future operation after the first leakage treatment. Because the cylinder is still constantly deforming.

2. The force situation of the cylinder during operation is very complicated. In addition to the static load of the pressure difference between the gas inside and outside the cylinder and the weight of each component installed in it, it also has to withstand the reaction force of the static part when the steam flows out of the static blade, and each The force exerted on the cylinder in the cold and hot state of the connecting pipe. Under the interaction of these forces, the cylinder undergoes plastic deformation and causes leakage.

3. The load of the cylinder increases or decreases too fast, especially when the temperature is rapidly changed during rapid start-up, shutdown and operating conditions, the way of warming the cylinder is incorrect, the insulation layer is opened too early during shutdown and maintenance, etc. Large thermal stress and thermal deformation.