Refreshing Extension of the Operation of High Pressure Rotors and Average Pressure Rotors of the Turbine K-200-130 at the Kurakhovska Heat Power Plant

Abstract

The power-generating units at the Kurakhovska Heat Power Plant of 200MW with steam turbines K-200-130 that reached their fleet life require today the decision taking on the possibility of their further operation. In this connection, the problems of taking into consideration the damages caused by the action of high local temperatures, the local temperature nonuniformity and a reliable estimation of the residual life of rotors is vital. Based on the developed methods of calculated estimate of the action of local nonuniformity of heat losses we computed the residual life of HP and AP rotors of the steam turbine K-200-130-3. The elastically deformed rotor state was calculated taking into account the joint action of the temperature gradient, centrifugal forces and steam-pressure in operation. A total level of damage of the metal of HPR and APR was defined based on the computations of the low-cycle fatigue and the static damageability. The recommendations were given on the opportunity for the refreshing extension of the service life of high pressure rotors and low pressure rotors of the steam turbine of 200 MW used for the power-generating units No 4 and No 5 at Kurakhovska heat power plant, exceeding their fleet life stated in current normative documents. High pressure rotors and low-pressure rotors of the power-generating unit No 4 at Kurakhovska heat power plant can operate for additional 45 thousand hours and the power-generating unit No 5 can additionally operate during 50 thousand hours. Key words: average pressure rotor, high pressure rotor, cold start-up, warm start-up, hot start-up, residual life, low-cycle fatigue and the long-term strength.