*2.2. Combined Cycle*

The combined cycle field consists of one MS6001FA heavy-duty gas turbine with a generator of a rated electric power output of 70 MW at 20 ◦C ambient dry bulb temperature. It has one HRSG that receives about 206 kg/s flue gas at about 600 ◦C from the gas turbine at full load operation. The flue gas leaves the HRSG at about 100 ◦C. Under the rated conditions of the gas turbine and HRSG, full load operation and solar heat input of 50 MW and 20 ◦C ambient dry bulb temperature, the steam turbine generator output is about 65 MW.

The HRSG of the ISCC power plant in Kureimat comprises three high-pressure economizers (HP ECO), a high-pressure evaporator (HP EV), a high-pressure steam drum (HP Drum at a pressure about 80 bar), and five high-pressure superheaters (HP SH) for a feed of the high-pressure section of the steam turbine, as shown in Figure 1. Besides this, it includes a low-pressure evaporator (LP EV), low-pressure steam drum (LP Drum at a pressure about 11 bar), and low-pressure superheater (LP SH) for a feed of the steam turbine low-pressure section. The solar-generated steam is injected into the high-pressure drum.

**Figure 1.** A flow diagram of the integrated solar combined cycle (ISCC) power plant in Kureimat with state points illustration.

## **3. Thermodynamic Analysis**

The ISCC was evaluated assuming steady-state operation, with no accounting for thermal capacitance. This assumption works fairly well through the majority of the operating day but creates some problems in the morning when the solar field is warming up.

.

.
