Operation control manner and its control device null of combined cycle generation of electricity

摘要

PURPOSE:To dispense with the deaeration of condensate by composing a lower space in a condenser of an isolating valve disposed outside the condenser and a partition member disposed inside the condenser to hold the lower space at a high degree of vacuum and prevent oxygen in the atmosphere from dissolution in the condensate. CONSTITUTION:The interior of a condenser 11 in a combined cycle power generation plant is defined into an upper space A for condensing exhaust of a steam turbine 9 and a lower space B for accumulating condensate in the air tight manner by a partition member 21. Both spaces A, B are connected to each other through a communicating pipe 22 provided with an isolating valve 23 drivably opened and closed by an isolating valve driving device 35. An air ejector 17 is provided to communicate to both upper and lower spaces A, B. When a predetermined load condition is obtained in the process of stopping the generating plant, a water level set value of a hot well 13 is changed from normal water level to banking water level, the isolating valve 23 is closed after stopping the running of a condensation pump 14 and the hot well 13 is shut off from the atmospheric circumstance to controllably enter a hot banking.