FIELD OF INVENTION
The present invention relates to an improved single cylinder medium capacity Reheat-condensing steam turbine.
BACKGROUND OF INVENTION
The existing medium capacity Reheat- condensing steam turbines are normally available in two different designs. One is a double-cylinder-type having two modules, namely HP and LP cylinders. The second type of steam turbine, is a single-cylinder medium capacity Reheat-condensing turbine which uses impulse blading. Although, this type of turbines is comparatively compact, and less-expensive, however, its efficiency is lower due to adaptation of impulse blading. The capacity of these prior art steam turbines ranges between 120-150 MW.
OBJECTS OF INVENTION
It is therefore an object of the invention to propose an improved single cylinder medium capacity reheat-condensing steam turbine which eliminates the disadvantages of prior art.
Another object of the invention is to propose an improved single cylinder medium capacity reheat-condensing steam turbine which has a shorter foot-print.
A still another object of the invention is to propose an improved single cylinder medium capacity reheat-condensing steam turbine which uses reaction blading.

Yet another object of the invention is to propose an improved single cylinder nedium capacity reheat-condensing steam turbine which is provided with means for reheat of steam.
A further object of the invention is to propose an improved single cylinder medium capacity reheat-condensing steam turbine which is compact in configuration.
A still further object of the invention is to propose an improved single cylinder medium capacity reheat-condensing steam turbine which has a capacity between 120-150 MW.
BRIEF DESCRIPTION OF THE INVENTION
According to the invention, there is provided an improved single cylinder reheat-condensing steam turbine with a provision for reheat of steam, and which uses reaction blading.
The turbine has a single alloy steel casing and a carbon steel exhaust hood bolted to the casing. The casing houses a HP inner casing , an IP inner casing and guide blade carriers. A Rotor is mounted on a front and a rear bearing pedestals. A plurality of IP inlet valves are bolted to the casing. Except for the Regulating Stage (the first stage), all other drum stages (except the last 3) use Reaction Blading. The last 3 stages comprise twisted and tapered LP blades.

This improved Single Cylinder Steam turbine has the following comparative advantages over the existing 2-cylinder Steam turbines:
1) More compact, thus saving on the material cost and manufacturing cost &
lesser manufacturing cycle time.
2) Occupies less space, lesser weight, therefore has less civil Construction
costs during installation.