Turbine parameters? What are these?
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This is the Hangzhou Steam Turbine parameter dashboard. What does “turbine chamber pressure” mean? Hey, experts from all over, please share your advice~~~ {:2_36:}
It is the steam inlet pressure of the speed-regulating stage.
During normal operation, the pressure gauge always shows 0. What’s going on?
Is the valve open? No, that’s not right; this area is important for determining whether there is scaling in the flow passage
The manual includes a curve for adjusting the characteristics of the steam valve; depending on the amount of steam supplied, the pressure in the wheel chamber varies. This parameter is important for determining the operating conditions of the turbine
There should also be a pressure transmitter at the site that shares the sampling point with the primary gauge; if the pressure transmitter shows a value, then the lack of a reading there indicates overreading, which is due to an improper design of the sampling point.
It doesn’t allow steam to pass through; there can be no pressure during operation
Apart from the exhaust pressure, all other measurement values are 0. What’s going on?
The pressure in the turbine wheel chamber is the pressure after the regulating stage; during design, the strength effects when the valves are fully open under the highest operating conditions are taken into account. In operation, the pressure in the wheel chamber is used for monitoring the turbine’s operating conditions. If the pressure in the wheel chamber increases at the same flow rate, it may be due to fouling on the blades ； Conversely, at the same flow rate, a decrease in the wheel chamber pressure may be caused by wear of the steam seal plates between the blade stages downstream of the regulating stage.
The pressure in the turbine’s regulating stage: In small turbines, the first stage consists of a double-row of speed stages, also known as compound speed stages. This is the turbine’s regulating stage. Its function is to allow steam to enter it; it undertakes a large portion of the enthalpy reduction, converting the steam’s internal energy into mechanical energy of the rotor. The enthalpy of the steam after passing through the regulating stage is lower. In the design of small and medium-sized turbines, this allows for a reduction in the number of pressure stages, thereby shortening the rotor length and saving metal. There is a specified value for the pressure in the regulating stage, and during normal operation, this pressure should be less than or equal to that specified value.