Back Pressure Turbines

Back pressure turbines can either be single stage or multi-stage which are often used in industrial plants. The turbine serves as a reducing station between boiler and process steam header. These turbines can either be used for drive application (sugar mill drive, sugar fibrizor / shredder drive, pump drives and so on.) or power generation application in which case the turbine drives the generator.

These turbines are straight-back pressure type. These type of turbines find application where back pressure steam is fully utilized to meet process demands. The power generation is incidental to the process steam demand.

The back pressure turbine may also have bleed points (uncontrolled extractions) to satisfy steam demands at intermediate pressures. This provision is applicable when the bleed (medium pressure) steam volume demand is low and pressure variations can be tolerated. These turbines are of bleed cum back pressure type.

The back pressure turbine with one controlled extraction point is possible. This extraction steam is also used to meet process steam demand at intermediate pressure when volume demand is high and pressure variations cannot be tolerated. These turbines are of extraction cum back pressure type.