To shorten time duration of repair

especially for breakdown maintenance of the steam turbine

a method of air fast-cooling has been commonly used for shortening the cooling time of modern large-sized steam turbines. Through analysis of the fast-cooling system of steam turbines

directing against some existing problems

an improving method for the fast-cooling system has been put forward. After improvement

the fast-cooling system to be simpler and more economical than the original one. And the feasibility of applying the improved system has been analysed.