What is turbine sliding parameter shutdown?

Starting from rated parameters and rated load, the steam turbine fully opens the high-pressure and medium-pressure regulating valves, and the boiler changes the combustion, gradually reducing the steam parameters, so that the steam turbine load is gradually reduced; At the same time, the cylinder flange heating device was put into use, gradually reducing the temperature of the cylinder flange. When the main steam parameter drops to a certain value, the generator will stop, which is called sliding parameter stop.