Steam turbine blade vibration monitor backpressure limiting system and method

摘要

A blade vibration monitor backpressure limiting system (BVMBLS), that in addition to direct blade vibration and condenser backpressure monitoring utilizes other plural types of other parallel, real time monitored power plant operation state (OS) information that influences blade vibration. The system references previously stored information in an information storage device that associates respective types of monitored OS information with blade vibration. The BVMBLS determines in real time a likelihood of whether any of the monitored operation states, alone or in combination with other types of monitored operation states, is indicative of a turbine blade vibration safe operation (SO). The BVMBLS determination is utilized to increase or reduce power generation load incrementally so that power efficiency and maximum load is enhanced while turbine blade vibration is maintained in a safe operation state. The previously stored information is updated to new association information.

主权项

1. A method for monitoring and controlling power plant steam turbine blade vibration within a designated safe operation range, limiting backpressure on the blades by altering the turbine output load, comprising:
sampling in real time with sensors coupled to steam power plant equipment a plurality of types of operation states that impact steam turbine blade vibration, including among others steam turbine blade vibration amplitude and backpressure on the blades; storing in a first automated data storage device at least one sampled data reading for each respective type of operation state; determining in real time a likelihood of whether one or a combination of the respective at least one sampled operation state data readings is indicative of steam turbine blade vibration safe operation by:
referencing in a second automated data storage device previously stored information associating operation states with steam turbine blade vibration; comparing at least one stored operation state sample reading from each respective type of sampled operation state with respective stored association information relevant thereto and making respective turbine blade vibration safe operation first confidence level determinations;comparing a combination of the at least one stored sample reading from each respective type of sampled operation state with respective stored association information relevant thereto, if such combination information is available, and making respective turbine blade vibration safe operation second confidence level determinations; andcombining all prior sequentially determined confidence levels information to derive a turbine blade vibration safe operation overall confidence level; causing the steam turbine to lower turbine load incrementally when any of the sequentially determined first through overall confidence levels is below a desired margin of safe operation; and causing the steam turbine to increase turbine load incrementally when the overall confidence level is indicative of turbine blade vibration safe operation.