Supercritical heat recovery steam generator reheater and supercritical evaporator arrangement

A combined cycle power plant, comprising:

• a gas turbine system having an exhaust port configured to discharge exhaust gas;
• a steam turbine system comprising a high pressure section, an intermediate pressure section and a low pressure section positioned on a common shaft;
• and
• a supercritical heat recovery steam generator comprising:
• a duct defining an interior area and having a gas inlet and a gas outlet, the duct being configured to convey gas from the gas inlet to the gas outlet, and a portion of the duct between the gas inlet and the gas outlet defining an exhaust gas flow segment of the interior area;
• a moveable partition positioned in the interior area;
• a supercritical evaporator disposed in the interior area;
• a first stage reheater disposed in the interior area;
• and
• the first stage reheater and the supercritical evaporator being disposed in the exhaust gas flow segment, adjacent to each other with respect to the flow of the exhaust gas,
• wherein the moveable partition is configured to adiust a volume between the supercritical evaporator and the first stage reheater within the interior area based on a load condition.

A method for operating a combined cycle power plant comprising;

• providing a gas turbine system having an exhaust port;
• providing a steam turbine system comprising a high pressure section;
• providing a supercritical heat recovery steam generator comprising a duct defining an interior area, a moveable partition positioned in the interior area, a supercritical evaporator disposed in the interior area and a first steam reheater disposed in the interior area, the first stage reheater and the supercritical evaporator being disposed, adjacent to each other with respect to the flow of the exhaust gas, in a common exhaust gas flow segment defined by a portion of the interior area;
• moving the partition to adjust a volume between the supercritical evaporator and the first stage reheater within the interior area based on a load condition;
• discharging exhaust from the gas turbine system;
• supplying cold reheat steam from the steam turbine system to the first stage reheater;
• supplying a fluid to the supercritical evaporator;
• and
• flowing the exhaust gas in parallel flow paths around exterior surfaces defined by the first stage reheater and the supercritical evaporator.