Patent ID: 11873723
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 9:
10. A method for cleaning a steam turbine plant including a boiler configured to generate steam, a steam turbine configured to be driven by the steam from the boiler, a condenser configured to convert the steam exhausted from the steam turbine to water, a condensate pump configured to raise a pressure of the water from the condenser, a main steam line configured to guide the steam generated in the boiler to the steam turbine, a steam stop valve provided in the main steam line and configured to stop an inflow of the steam into the steam turbine, a bypass line branched from a position closer to the boiler than the steam stop valve in the main steam line is and connected to the condenser, a bypass valve provided in the bypass line, a condensate line configured to guide the water inside the condenser to the condensate pump, a condensate outlet valve provided in the condensate line, a water supply line configured to guide the water whose pressure is raised by the condensate pump to the boiler, and a pure water supply apparatus including a pure water tank configured to store pure water, and configured to supply the pure water inside the pure water tank into the condenser, the method comprising:
a preparation step; and
a blowing-out step,
wherein the preparation step includes
a blowing water recovery apparatus installation step of connecting a blowing water recovery apparatus having a blowing water tank configured to temporarily store the water from the condenser at a position closer to the condenser than the condensate outlet valve in the condensate line is, and
a temporary pure water line connection step of connecting a temporary pure water line to feed the water inside the pure water tank, at a position closer to the condensate pump than the condensate outlet valve in the condensate line, and

the blowing-out step includes
a blowing-out line setting step of closing the steam stop valve and the condensate outlet valve and opening the bypass valve,
a pure water supply step of supplying the pure water inside the pure water tank to the boiler via the temporary pure water line, the condensate pump, and the water supply line,
a steam supply step of generating the steam by heating the pure water supplied to the boiler in the pure water supply step inside the boiler, guiding the steam generated in the boiler to the condenser via the main steam line and the bypass line, and converting the steam guided to the condenser to the water inside the condenser, and
a blowing water recovery step of feeding the water accumulated inside the condenser in the steam supply step to the blowing water tank.