Energy and Exergy Analysis of Boiler in Bagasse Based 20 MW Steam Power Plants

In present study energy and exergy analysis has been applied to baggasse based 20 MW steam power plant. The energy losses at various locations in power plant have been calculated by applying energy balance. Rate of exergy destruction or irreversibility in different components of power plant are calculated by applying exergy balance. It is found that energy losses in boiler and condenser are equal and around 95% of total energy losses in power plant. The irreversibility rates of the boiler are found to be much higher than the irreversibility rates of the other components. First law efficiency and second law efficiency of boiler are calculated. The changes of the irreversibility rates of boiler with the ambient temperature (for range 278-313K) are studied. As the ambient temperature is increased from 278 to 313 K, the irreversibility rates of the boiler also increase. The calculations for efficiencies of steam power plant based on first law of thermodynamics and second law of thermodynamics have been calculated at ambient temperature of 298 K and values are found to be 23.82% and 19.48% respectively.