The backpressure issue in backpressure steam turbines
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The backpressure issue in backpressure steam turbines: The pressure of the medium-pressure steam entering the turbine remains constant, and the exhaust pressure is low, allowing the turbine to generate power. But why do some systems still include a safety mechanism for low exhaust pressure?
It mainly controls the stability of the compressor speed regulation system and the axial force of the turbine, thereby protecting the turbine’s rotor and blades
From an energy-saving perspective, the greater the steam pressure difference before and after the turbine, the better, as it indicates efficient work performance and fewer energy losses. But this is only possible on the condition that the equipment can handle it; if it cannot, one must find a balance point between the two options and make a compromise! Since I started working at the factory, I’ve always heard the supervisors say: Protect the equipment, not production! Looking back, it makes sense – without the equipment, how can production be ensured?
It is supposed to protect the subsequent blades from excessive stress and moisture erosion
It mainly controls the stability of the compressor speed regulation system and the axial force of the turbine, thereby protecting the turbine’s rotor and blades； The lower stages of the blades are protected to prevent excessive stress and erosion by moisture; at low pressures, steam tends to form scale and salts, and condensed water can cause erosion.
Personally, I think it’s mainly about the stability of the speed control system