Abstract: Radiator freezing is common in indirect air-cooling units in alpine regions. In order to improve the running security of the indirect air-cooling units in winter, in-depth analysis and research on freezing in sector radiator tubes are conducted, which concludes that the existing anti-freezing measures are inefficient in alpine regions. Therefore, a design for anti-freezing and pre-heating is proposed with anti-freezing measures and ice-melting methods for the radiator fin tube bundles presented. The new design can provide a safeguard for the secure and reliable operation of the indirect air-cooling units in alpine regions.

Key words: coal-fired generating unit, indirect air cooling, cold area, radiator, anti-freezing and pre-heating