Abstract
To increase the efficiency of a combined-cycle gas turbine (CCGT) power plant, an innovative system was built to recycle its internal unutilized energy and increase the heatingoutput. CCGT circulation and absorption heat pump circulation were combined in the new system, and latent heat recovery from LNG combustion was realized with very slight power consumption. The innovative system was applied in a 200-MW power plant, and real operation data were obtained to design optimal temperature and flow rate balance. Finally, the effect of system transformation on the efficiency increase was analyzed. The proposed system enhanced the overall primary energy efficiency of cogeneration and thermal output by 2.6 and 7.4%, respectively.
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