| 摘要 |
The invention relates to a method for operating a steam power plant, particularly a combined cycle power plant (10), which comprises a steam/water cycle (20) with a heat recovery steam generator (16), a water-cooled condenser (21), a feedwater pump (26) and a steam turbine (17,18,19), whereby a cooling water pump (22) is provided for pumping cooling water through said water-cooled condenser (21), and evacuating means (25) are connected to said water-cooled condenser (21) for evacuating at least said water-cooled condenser (21) The inventive operating method is related to a shut down and start-up of said power plant (10) after said shut down and comprises the steps of:
a) shut down of the steam turbine (17,18,19);
b) restoration of a good vacuum within the condenser (21) by using said evacuating means (25);
c) stopping said cooling water pump (22) of said water-cooled condenser (21) and said evacuating means (25), and filling up at least said condenser (21) with steam up to slightly above atmospheric pressure;
d) controlling the pressure with a flow of said cooling water;
e) after a certain shut-down period starting the cooling water pump (22) just before start-up of the plant (10);
f) starting the plant (10). |
