First-stage back pressure of turbine
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What is the significance of the primary back pressure in a condensing steam turbine? What is the definition of primary back pressure? Does a high or low value have any impact on the operation of the turbine?
It refers to the pressure behind the first-stage impeller of the turbine. If the inlet pressure is 5 MPa and the pressure behind the impeller is 4.8 MPa, a small pressure drop indicates that the turbine performs poorly and has high energy consumption; it is unable to handle the load, and even with the main steam valve fully open, the speed does not increase. The higher the pressure on the back of the impeller, the worse the turbine’s performance, and maintenance is required – scaling is likely the cause