The plant considered in this paper produces both
electricity and steam in cogeneration for an industrial user,
in base load operation. This plant is an interesting example
of integrated energy production. The realization of several
such plants is scheduled in the next few years in Italy on
various industrial sites, where there are industrial users
capable of using the thermal energy produced. In the case
of gas turbine combined plants, cogeneration operation for
both electricity and heat production adds further
constraints on heat production and enhances the gas
turbine section with respect to the lower steam plant.
These constraints can make the use of an inlet air cooling
section for a cogeneration plant even more economical
than for a normal combined cycle plant.
The plant layout is shown in Figure 2. The topper is a GE
LM6000 dry low-NOx in combined cycle, which is
equipped with a two-pressure level unfired HRSG, that
produces steam at 40 bar (580 psia) and 8 bar (116 psia).
The low-pressure steam is purchased by an industrial user,