Section 1: Modern Power-Plant Cycles and Equipment

Section 2: Steam Condensing Systems and Auxiliaries

Section 3: Combustion

Section 4: Steam Generation Equipment and Auxiliaries

Section 5: Feedwater Heating Methods

Section 6: Internal-Combustion Engines

CHOOSING BEST OPTION FOR BOOSTING COMBINED-CYCLE PLANT OUTPUT

Select the best option to boost the output of a 230-MW facility based on a 155-MW natural-gas-fired gas turbine (GT) featuring a dry low NO _x combustor (Fig. 1). The plant has a heat-recovery steam generator (HRSG) which is a triple-pressure design with an integral deaerator. A reheat condensing steam turbine (ST) is used and it is coupled to a cooling-tower/surface-condenser heat sink turbine inlet. Steam conditions are 1450-lb/in ² (gage)/1000 F (9991-kPa/538 C). Unit ratings are for operation at International Standard Organization (ISO) conditions. Evaluate the various technologies considered for summer peaking conditions with a dry bulb (DB) temperature of 95 F and 60 percent RH (relative humidity) (35 C and 60 percent RH). The plant heat sink is a four-cell, counterflow, mechanical-draft cooling tower optimized to achieve a steam-turbine exhaust pressure of 3.75 inHg absolute (9.5 cmHg) for all alternatives considered in this evaluation. Base circulating-water system includes a surface condenser and two 50 percent-capacity pumps. Water-treatment, consumption, and disposal-related O&M (operating & maintenance) costs for the zero-discharge facility are assumed to be $3/1000 gal ($3/3.8 m ³) of raw water, $6/1000 gal ($6/3.8 m ³) of treated demineralized water, and $5/1000 gal ($5/3.8 m ³) of water disposal. The plant is configured...