Is it advisable to use VFD on a boiler feed pump ?
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There is research that indicates steam driven feed pumps may be more efficient for boilers rated 300 MW and larger. VFD driven BFW pumps seem to have been the preferred alternative for 30 years. Various types of electrical and electromechanical variable-speed drives have been used for more than 90 years.
There is likely a lot of literature about energy consumption and safety. Study the literature and form your own opinion.
A Comparative Study on Economy of Driving Mode for Boiler Feed Pumps Xianyong Peng; Peihong Wang Power and Energy Engineering Conference (APPEEC), 2010 Asia-Pacific Year: 2010
Adjustable-speed drives for thermal power plant boiler feed pumps. Russian and American experience Oliver, J.A.; Samotyj, M.J.; Shakarian, Y.; Vinitsky, Y. Electric Machines and Drives Conference Record, 1997. IEEE International Year: 1997
Power plant auxiliaries and their relation to heat balance Penniman, A.L. A.I.E.E., Journal of the Year: 1924, Volume: 43, Issue: 2
Power measurement and harmonic analysis of large adjustable speed drives Oliver, J.A.; Banerjee, B.B. Energy Conversion, IEEE Transactions on Year: 1988, Volume: 3, Issue: 2
Computer based Boiler Feed Pump protection and changeover scheme Vinurashini, R.; Jayasri, R.; Veerapriya, N.; Umamaheswari, S. Energy Efficient Technologies for Sustainability (ICEETS), 2013 International Conference on Year: 2013