The exergy efficiency and loss of each link in power generation was revealed by exergy analysis for efficiency of a 135 MW unit with circulating fluidized bed(CFB) boiler.Results show that

for the135 MW unit that working with the CFB boiler

the exergy loss during combustion and heat transfer process are the two maximum parts of all exergy losses.Meanwhile

to improve the performance of the unit system

methods for decreasing such indexes as the exergy loss during combustion and heat transfer

the condenser backpressure and carbon content in fly ash etc.are discussed.