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Triveni currently manufactures these
turbines upto 20 MW at Bangalore plant and upto 35 MW with imported
parts.
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
medium 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.
In some cases it may be necessary to have both bleed and controlled
extraction steams from the back pressure turbine. These turbines are of
bleed cum extraction cum back pressure type.
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