STEAM PIPELINE PURIFYING FACILITY AND METHOD OF SINGLE SHAFT TYPE COMBINED CYCLE POWER PLANT

摘要

PURPOSE:To make it possible to purify the pipeline of a steam system utilizing the generated steam while a gas turbine generator and an exhaust heat recovery boiler are operated safely by providing a temporary discharging pipeline and a pressure regulator valve. CONSTITUTION:A gas turbine generator is operated with load after it is separated from a steam turbine 15 in the course of a power plant construction and test run. The steam for purification is generated in an exhaust heat recovery boiler 1 by the operation of this gas turbine generator. The steam pressure thus generated is stably adjusted and controlled by pressure regulator valves 4a and 4b so that the exhaust heat recovery boiler 1 will not make a sudden stoppage. The steam flow is controlled intermittently by the pressure regulating valves 4a and 4b and, by this steam flow, the pipeline interior of a steam system is purified. The steam, after purification, is discharged to the outside through a temporary discharge pipeline 3. Thus, a steam blowoff into a pipeline can be performed while the gas turbine generator and the exhaust heat recovery boiler 1 are being operated stably.