Abstract:-Thermodynamic analysis of the triple pressure reheat
combined cycle gas turbine with duct burner are presented and
discussed in this paper .The overall performance of a combined
cycle Gas turbine power plant is influenced by the ambient temperature and
turbine inlet temperature. These parameters affect the overall thermal
efficiency, power output .The ambient temperature increases the gas
temperature and also the individual steam
production rate also increased at each stage of the turbine. The exergy
is used to evaluate maximum
irreversibility of the process present in the cycle.
I.
Introduction
Heat Recovery Steam Generator (HRSG) is an interface between
the gas cycle and the steam cycle in combined cycles. The classical approach to
HRSG optimization is the “pinch-point” method, i.e. imposing the minimum
temperature difference between the two agents.
The worldwide demand for combined
cycle power plants is growing dramatically, with some experts forecasting
explosive growth over the next decade. In its basic form, a gas turbine
exhausting into a heat recovery steam generator (HRSG) that supplies steam to a
steam turbine cycle is the most efficient system of generating electric
electricity today. The last two decades with unit plant efficiencies of 30% to
35%, comparable to the state-of-the-art fossil-fired power stations. The below
calculations give the information about the performance increased by installing
the HRSG in combined cycle power plant.
A.
Steam Power Plant
Power plants generate electrical power by using fuels like
coal, oil or natural gas. A simple power plant consists of a boiler, turbine,
condenser and a pump. Fuel, burned in the boiler and super heater, heats the
water to generate steam. The steam is then heated to a superheated state in the
super heater. This steam is used to rotate the turbine which powers the
generator.
Fig. 1: Layout of Steam power
plant
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