Produce a schematic diagram of the system, Physics

Produce a schematic diagram of the system:

The steam that leaves the super-heater is expanded from 130bar at 535°C to 25.2bar at 310°C in a high pressure turbine. The steam from the exit of the HP turbine is reheated to 535°C in the boiler. The reheated steam is then expanded to 8.5bar at 378°C in the intermediate pressure turbine, after which a certain percentage of the steam is bled off to a feedwater heater. The remaining steam is then  expanded through a low pressure turbine to 0.05bar and a dryness fraction of 0.94. All 'steam' entering the feed pumps shall be a saturated fluid.

a)  Produce a schematic diagram of the system, together with an appropriate labelled T-s diagram.

b)  Using steam tables only, calculate:

(i)  The isentropic efficiencies of  the three turbines;

(ii)  The cycle efficiencies;

(iii)  The percentage of steam bled off to the feedwater heater;

(iv)  If the turbines generate 200MW power, how much cooling water must be used per hour, assuming that water can be returned to the river at only 10°C above its extraction temperature? (Assume that the specific heat capacity of water is 4.18 kJ/(kg·K));

(v)  If a high pressure surface-type feedwater heater is placed between the boiler and HP feedwater pump to raise the feedwater temperature, configure the cycle and analyse the impact on the cycle performance.

Posted Date: 2/14/2013 5:46:18 AM | Location : United States







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