Patent ID: 7562531

Claim:
A method for obtaining operative reconversion of a pair of pre-existing steam turbo-units, in which at least one pair of said steam turbo-units, a first of which comprising a first steam turbine ( 2 ) and a first electric generator ( 6 ) connected on a first common shaft ( 4 ) and a second of which comprising a second steam turbine ( 3 ) and a second electric generator ( 7 ) connected on a second common shaft ( 5 ), are coupled to one another in a configuration of a cross-compound type; said method being characterized in that it comprises at least: a step of decommissioning and removal of the high-pressure and medium-pressure sections of both of said steam turbines; a step of replacement of the removed sections with a new high-pressure section ( 10 ) on the first shaft and a new medium-pressure section ( 14 ) on the second shaft, said new high-pressure and medium-pressure sections being made in such a way as to occupy at least part of the space left free, on each shaft, by both the high-pressure section and the medium-pressure section removed from that shaft, leaving the pre-existing foundations unaltered; and a step of setting in hydraulic connection in cascaded fashion the new high-pressure section on the first shaft and the new medium-pressure section on the second shaft to a single supercritical boiler ( 22 ), in such a way that the latter will be able to supply one and the same flow of steam, in series, to the new high-pressure section and, then, to the new medium-pressure section.