5. Gas-steam combined cycle with parallel arrangement

5.1 Principle

PPCC involves using two independent sources of thermal power for the steam turbine. The main source is usually a conventional steam boiler, and the second is a recovery boiler using exhaust fumes from a gas turbine. One difference with the CCFF is that the existing steam boiler undergoes no fundamental modification.

One or more TG+CR units can be arranged in parallel with the original system in two different ways :

• steam is supplied to the turbine exclusively from the existing steam boiler. The recovery...