COMBINED CYCLE PLANTS



The  maximum  steam  temperature  in  a  power  cycle  does  not  exceed  600  ° C, although the temperature in a dry bottom pulverized coal furnace  is about  1300
°C.

By  superposing  a  high  temperature  power  plant  as  a  topping  unit  to  the  steam plant,  a  higher  energy  conversion  efficiency  from  fuel  to  electricity  can  be achieved, since the combined plant operates through a higher temperature range.

Combined plants may be of the following types:
(i) Gas turbine —steam turbine plant

(ii) MHD —steam plant

(iii) Thermionic —steam plant

(iv) Thermoelectric —steam plant

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