Author(s): MUDITA DUBEY, Prof. ABHAY SHARMA
Published in: International Journal of Engineering Research & Technology
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Volume/Issue: Vol.1 - Issue 5 (July - 2012)
In the present work, energy analysis of a coal-based thermal power plant is done using the design data from a 210 MW thermal power plant under operation in India. The entire plant cycle is split up into three zones for the analysis: (1) main steam system, (2) steam turbine, condenser, feed pumps and the HP and LP heaters, (3) the entire analysis with boiler, turbo-generator, condenser, feed pumps, regenerative heaters and the plant auxiliaries. It helps to find out the contributions of different parts of the plant towards energy destruction. The energy efficiency is calculated using the operating data from the plant at different conditions, viz. at different loads, different condenser pressures, with and without regenerative heaters and with different settings of the turbine governing. Effect of regeneration on energy efficiency is studied by successively removing the high pressure regenerative heaters out of operation.. Increase in the condenser back pressure decreases the energy efficiency. Successive withdrawal of the high pressure heaters show a gradual increment in the energy efficiency for the control volume excluding the boiler, while a decrease in energy efficiency when the whole plant including the boiler is considered. Keeping the main steam pressure before the turbine control valves in sliding mode improves the energy efficiencies in case of part load. The boiler efficiency is calculated by the indirect method (losses calculation method) and HP and LP heaters performance analysis has been done by the calculations. The net heat rate of the station is also calculated and target for the reduction to achieved the design value of the net station heat rate.
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