370 likes | 464 Views
More Mechanical Power From Fuel Power. P M V SUBBARAO PROFESSOR MECHANICAL ENGINEERING DEPAREMENT IIT DELHI. Enhance Regeneration by All Means……. The Concept of Super Regeneration. The Super Regenerative Cycle. The Field Cycle. COMPONENTS OF COMBINED CYCLE. ENERGY TRANSFER DIAGRAM.
E N D
More Mechanical Power From Fuel Power P M V SUBBARAO PROFESSOR MECHANICAL ENGINEERING DEPAREMENT IIT DELHI Enhance Regeneration by All Means……..
Energy Balance in Combined Cycle Fuel Power Waste Heat Final Waste heat
Thermal Analysis of Combined Cycle Net Power Output of Brayton Cycle: Rate of Heat Rejected in Brayton Cycle: Rate of Heat input to Rankine Cycle: Net Power Output of Rankine Cycle:
Net Power Output of Sandwich: Overall Efficiency of Sandwich:
Sensitivity Analysis Increasing the gas turbine efficiency improves the overall efficiency only if:
The rate of change of efficiency of Rankine cycle with respect to Brayton cycle is always negative. A care should be taken while improving the efficiency of Brayton cycle, so that it will not adversely affect the performance of Rankine cycle. A proper selection of operating variables of Brayton cycle and Rankine cycle is essential in getting maximum benefits due to Combination.
Free Parameters of the System • Pressure ratio in gas turbine. • Maximum temperature of steam. • Maximum pressure of steam. • Reheat pressure. • Reheat temperature. Objective Functions Maximize overall specific power output.
hR=0.3 hR=0.35 hR=0.4
Energy Balance in Combined Cycle Fuel Power R B Waste Heat HRSG Final Waste heat
Thermal Analysis of Combined Cycle Net Power Output of Brayton Cycle: Rate of Heat Rejected in Brayton Cycle: Rate of Heat input to Rankine Cycle: Net Power Output of Rankine Cycle:
Net Power Output of Sandwich: Overall Efficiency of Sandwich:
Sensitivity Analysis Increasing the gas turbine efficiency improves the overall efficiency only if:
The rate of change of efficiency of Rankine cycle with respect to Brayton cycle is always negative. A care should be taken while improving the efficiency of Brayton cycle, so that it will not adversely affect the performance of Rankine cycle. A proper selection of operating variables of Brayton cycle and Rankine cycle is essential in getting maximum benefits due to Combination.
Free Parameters of the System • Pressure ratio in gas turbine. • Maximum temperature of steam. • Maximum pressure of steam. • Reheat pressure. • Reheat temperature. Objective Functions Maximize overall specific power output.
hB hR=0.3 hR=0.35 hR=0.4
Energy Flow Diagram Effectiveness of HRSG