turbine
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Which is higher, the temperature of the upper or lower cylinder of the turbine under normal operating conditions? Those factors have an impact
During the startup and shutdown of high-pressure steam turbines, it is easy for a temperature difference to arise between the upper and lower cylinders. Sometimes, after the unit is shut down, the removal of the cylinder insulation can also lead to a large temperature difference between the upper and lower cylinders; in severe cases, this difference can reach around 130 degrees. Normally, the temperature of the upper cylinder is higher than that of the lower cylinder, with a temperature difference of less than 50 degrees. Otherwise, the upper cylinder may deform and the radial clearance of the lower cylinder will decrease, resulting in easy friction between the moving and stationary parts.
Under normal operating conditions, the temperature difference between the upper and lower sections is not very large; at most, the temperature in the upper section is one or two degrees higher than that in the lower section – it’s not significant. This is largely influenced by the insulation of the unit as well as external heat dissipation
The temperature of the lower cylinder in my unit’s steam turbine is higher than that of the upper cylinder; the technician said it’s related to the way air is introduced
It mainly depends on the temperature difference, which is determined on-site using the longitudinal pin.
It’s basically the same at runtime. The temperature difference between the upper and lower cylinders is not large; if it is large, it may be due to poor insulation or inadequate drainage. Generally, the lower cylinder is at a higher level, with the nozzle located in the lower cylinder
Reply to 4# Bai Ruiguang: This is also relevant. Ordinary turbines are divided into those with partial air intake and those with full air intake. However, regardless of the type of air intake, the temperature difference between the upper and lower parts is relatively small or essentially zero during normal operation, as this serves as an indicator of whether the turbine has been properly warmed up. Perhaps the lower cylinder will be slightly cooler than the upper one, but this difference must not be too large, as it can cause the cylinders to deform and result in the shaft rotating outside its designed concentricity; this in turn leads to excessive centrifugal force on the shaft bearings, causing wear and increased vibration