Abstract: Using the dualbackpressure condenser vacuumpumping system, the average vacuity of the dualbackpressure condenser can achieve designed value, and the consumption of auxiliary power can be reduced in large amplitude. If the singlemain piping vacuumpumping system of 600MW unit is transformed into dualmail piping doublesuction vacuumpumping system, its average vacuity can increase 0.7245kPa, and the coal consumption can be reduced by 4284.755t each year. If the dualmain piping singlesuction vacuumpumping system of 600MW unit is transformed into dualmail piping doublesuction vacuumpumping system, one vacuum pump can reduce the auxiliary power consumption by 621997kW·h each year. The economic benefits and the social effects of the technical reformation of the dualpressure condenser vacuum pumping system are notable.

Key words: dual-backpressure condenser, dual-main piping double-suction vacuum pump, single-main piping double suction vacuum pump, average vacuity, auxiliary power, economic benefit