Abstract: This article introduced a technology of reconstruction for the cold source system. And applied in a 300 MW unit,the economic benifits were analyzed,the result showed that: this technology can substantially depress the pressure of steam condenser,comparing with the pressure before reconstruction,the pressure depressed 1.2 kPa;after its application,the standard coal consumption of the unit depressed 3.6g/kW·h,the energy-saving benefits is about 3.267 million yuan each year.

Key words: the cold source system, the pressure of steam condenser, the standard coal consumption, the energy-saving benefits