Abstract
This paper describes various techno-economical energy conservation measures for reducing the carbon emission by improving the performance of primary air (PA) fans in coal fired thermal power plants based on the energy conservation/audit study conducted in 28 of 210 MW power plants in India. The best operating points for pressure gain, flow, pressure drop across hydrodynamic resistive elements, equipment efficiency, power input and specific energy consumption are simulated by using MATLAB and presented in this paper with a case study to validate the results. Optimising the pressure at PA fan discharge, control of excess air, pressure drop across air pre-heater (APH) and mills and maintaining the optimum primary air pressure at mills thereby to maintain appropriate coal-air pressure at burners will help in reduction of auxiliary power of PA fans. The implementation of energy conservation measures in a typical 210 MW coal fired thermal power plant reduces the overall auxiliary power of PA fans by 0.39% of gross energy generation and also reduce the carbon emission by 6,250 t/year.
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