THE WATER-STEAM CYCLE IN CCP POWER PLANTS
The thermal energy is taken up in the solar field and transports the heat transfer fluid must now be transformed into another type of energy that allows easy conversion into electricity. The electricity production with a steam turbine and an electric generator coupled to the shaft is a mature technology and widely known. It seems a simple and convenient solution of transforming HTF’s heat into a steam flow at a specific pressure. Thus, a new heat transfer fluid is required: water.
RENOVETEC also has a specific course on Water Steam Cycle, which can be done both face-to-face and in ONLINE.
Thus, the heat captured and transported by the HTF system heats water to generate superheated steam. That steam at high pressure and medium temperature (380 º C) is expanded in a steam turbine that will produce rotary mechanical power, easily transformed into electrical energy with the help of a synchronous generator.
The general scheme of the cycle that the liquid water follows until turning into steam and re-condensing (so-called water-steam cycle) is shown in Figure 13.2 (previous page).
In the scheme can be seen how liquid water begins its cycle in the gas-condensate well, a tank usually located under the condenser that contains all the steam to be condensed in this equipment, and that is the first water store for all the circuit. From there the water has to go through all the systems that the water-steam cycle consists, which are:
· Condensate pumps
· Low-pressure preheaters
· Feedwater tank (or degassing)
· High pressure feedwater pumps
· High pressure preheaters
· High pressure steam generation train
· High pressure bypass valve
13.1 WATER-STEAM CYCLE FUNCTION
13.2 WATER- STEAM CYCLE DIAGRAM
13.4 THE CONDENSATE PUMPS
13.5 LOW-PRESSURE PREHEATERS
13.6 FEEDWATER TANK
13.7 FEEDWATER PUMPS
13.8 HIGH-PRESSURE PREHEATERS
13.9 STEAM GENERATION TRAIN
13.9.1 Rankine Cycle
13.9.2 Equipment that make up the steam generation train
13.9.3 Justification of the use of two pressure levels
13.9.4 Steam generation train configuration
13.10 BY-PASS VALVE FOR HIGH PRESSURE
13.11 HIGH PRESSURE STEAM TURBINE
13.12 SETAM SEPARATOR
13.14 LOW PRESSURE BYPASS VALVES
13.15 LOW PRESSURE TURBINE