EVALUATION OF OUTPUT AND HEAT RATE OF THE SIMPLE CYCLE GAS TURBINE DURING THE BASE LOAD CONDITION
Keywords:
Output power, Heat rate, Ambient temperature, Atmospheric pressure, Humidity, Inlet and exhaust losses, Frequency, DegradationAbstract
The gas turbine is a power plant, which produces a great amount of energy for its size and weight. Performance
monitoring of gas turbine constitutes a key practice to ensure plant profitability, with considerable cost savings related to
maintaining maximum fuel efficiency and availability. Environmental considerations play effective roll in the performance of the
gas turbine. The gas turbine is a complex machine, and its performance and reliability are governed by many factors. In present
work, the tests were run on a frame type single shaft gas turbine unit. The performance test for the gas turbine was conducted with
HRSG while gas turbine was in cogeneration cycle mode. During the base load performance of the gas turbine, the gas turbine
was operated on full load (100% load). Evaluation of the gas turbine parameters (output and heat rate) by considering the factors
affecting the gas turbine performance like air temperature, ambient pressure, humidity, inlet and exhaust losses, frequency and
degradation. In accord with industry standards, the gas turbine performance is generally quoted at 15
0C ambient temperature,
60% relative humidity, sea level site conditions i.e. 1.01325 bar ambient pressure and zero inlet and outlet losses. In the real
world, however, ambient air temperature, site elevation, inlet and exhaust pressure drop all have impact on installed gas turbine
site performance. Since the gas turbine is an air-breathing engine, its performance is changed by anything that affects the density
and mass flow of the air intake to the compressor. Ambient weather conditions are the most obvious changes from the reference
conditions. This affects the gas turbine parameters i.e. output and heat rate. So correction to be considered for the factors
affecting the gas turbine performance like air temperature, ambient pressure, humidity, inlet and exhaust losses, frequency and
degradation. The present work discuss the variation in power as well as heat rate, compared to the gas turbine unit at ISO
conditions, with the help of simple correction curve, which are usually supplied by the manufacturer.
