Gas Turbine Power Plant Dr. M. Zahurul Haq Professor Department of Mechanical Engineering Bangladesh University of Engineering & Technology (BUET) Dhaka-1000, Bangladesh zahurul@me.buet.ac.bd http://teacher.buet.ac.bd/zahurul/ ME 403: Power Plant Engineering Gas turbines have these advantages over steam plants: They are small in size, mass, and initial cost per unit output. Their delivery time is relatively short and they can be installed quickly. They are quick starting (as low as 10 s), often by remote control. They are smooth running and have a capacity factor (percent of time the unit is operating at full power) of 96 to 98 percent. They can use a wide variety of liquid and gaseous fuels including gasified coal and synthetic fuels. They are subject to fewer environmental restrictions than other prime movers. c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 1 / 25 c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 2 / 25 T401 Schematic layout of a single-shaft gas turbine. T371 A comparison between the working cycle of a turbo-jet engine and a piston engine. T402 Schematic layout of a two-shaft gas turbine. c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 3 / 25 c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 4 / 25
T403 T404 Representation of a simple cycle gas turbine. Representation of gas turbine cycle on temperature-entropy diagram. T405 Effect of pressure ratio on the temperature-entropy diagram for an ideal gas turbine cycle when T 3 is constant. c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 5 / 25 c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 6 / 25 T406 T407 T408 Variation of thermal efficiency and specific work with compressor pressure ratio. Schematic representation of a regenerative cycle. Heat transfer for a regenerative gas turbine cycle. c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 7 / 25 c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 8 / 25
T409 Effect of T 4 and pressure ratio on the thermal efficiency of a regenerative cycle. The limiting pressure ratios when T 5 = T 2 are shown. T410 Ideal and actual compression and expansion processes on the temperature-entropy diagram. c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 9 / 25 c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 10 / 25 T411 Variation of the isentropic efficiency with pressure ratio for a polytropic efficiency of 0.87. T412 Combustion temperature rise versus fuel-air ratio. c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 11 / 25 c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 12 / 25
T413 T414 Simple gas turbine thermal efficiency varying with pressure ratio. Performance of a practical simple gas turbine cycle as a carpet plot for a series of maximum cycle temperatures and pressure ratios. c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 13 / 25 c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 14 / 25 T418 Schematic representation of an intercooled gas turbine. T417 Carpet plot for a regenerative gas turbine cycle. T419 Two-stage intercooled compression process on the temperature-entropy diagram. c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 15 / 25 c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 16 / 25
T420 Variation of thermal efficiency with specific work for a practical intercooled gas turbine when optimised for maximum thermal efficiency. c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 17 / 25 T421 Schematic representation of an intercooled, regenerative gas turbine cycle. c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 18 / 25 T423 T422 Temperature-entropy diagram for the intercooled and nonintercooled, regenerative gas turbine cycles. c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 19 / 25 Variation of thermal efficiency with specific work for a practical intercooled, regenerative gas turbine cycle c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 20 / 25
T424 T427 Schematic representation of a reheat gas turbine. Variation of thermal efficiency with specific work when optimised for maximum thermal efficiency. c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 21 / 25 c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 22 / 25 T429 Schematic representation of a reheat-regenerative gas turbine. T430 Schematic representation of an intercooled, reheat and regenerative cycle. c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 23 / 25 c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 24 / 25
T433 Variation of thermal efficiency with specific work for practical intercooled, reheat and regenerative (ICRHR) cycle. c Dr. M. Zahurul Haq (BUET) Gas Turbine ME 403 (2015) 25 / 25