The Steam Turbine Reconstruction Of Using Lateral Teeth Steam Seals

Steam seal between movement parts is an important part which directly impacts on safe and economic operation of steam turbine.Steam turbine flow system of thermal power plant adopts traditional seal of spring back brace comb type,mainly used to control the steam leakage.The sealing mechanism is by the damping produced by multistage throttle expansion to achieve the purpose of reducing working medium leakage.The shortcoming of traditional back brace spring comb tooth seal is easy to increase steam leak and decrease the efficiency.To get a steam seal of more reasonable structure and better effective has always been the target of steam turbine experts at home and abroad to explore.Both here and abroad in recent years successively developed several kinds of comb which is superior to the traditional back brace spring tooth seal structure.These different seal types have been used in technical improvement of many types of domestic steam turbines,greatly enhancing the safety and economy of steam turbine,many power plants getting great economic benefits.An energy station #2 steam turbine gland is the type of conventional traditional back brace spring comb tooth.This paper researches #2 steam turbine issues that there are the large amount of steam seal leakage and the great amount of water in lubricating oil during the engine was running,discuses the bad sides that the seal influences the engine safety and analyses the working characters of the Lateral Teeth Steam Seals.On this basis,this author of the paper propsed the technical renovation scheme of #2 steam turbine gland,and respectively assesses the synthetic performance parameters of the engine by two aspects of safety and economy after the implementation of technical renovation.Results show that after modification,the hidden troubles were eliminated,safety and reliability and the thermal efficiency was improved.