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A supercritical steam generator is a type of boiler that operates at supercritical pressure and temperature, frequently used in the production of electric power. In contrast to a subcritical boiler in which steam bubbles form, a supercritical steam generator operates above the critical pressure – 22 megapascals (3,200 psi ) and temperature ...
The primary difference between the three types of pulverized coal boilers are the operating temperatures and pressures. Subcritical plants operate below the critical point of water (647.096 K and 22.064 MPa). Supercritical and ultra-supercritical plants operate above the critical point.
Named for former SWEPCO president and CEO John W. Turk Jr., the plant came online in 2012 as the first sustained "ultra"-supercritical coal plant in the United States, reaching boiler temperatures above 1,112 °F (600 °C) and pressures above 4,500 psi (310 bar). [3] The plant relies on low-sulfur coal from the Powder River Basin.
Vanderbilt boiler An American design, similar to the Lentz and large launch-type boilers. [36] Velox boiler: [61] vertical boiler: flued or fire-tube designs where the main shell is a cylinder on a vertical axis, rather than horizontal. Boilers of this external form may have a great variety of internal arrangements.
The power station consists of two 1,000MW ultra-supercritical coal-fired units, each with a once-through boiler and a 3000rpm steam turbine operating at 603°C and 270 bar. The units feature water-cooled stator, hydrogen-cooled rotor generators, a 160m-high chimney with 9.1m internal diameter, and on-site ash storage facilities.
Supercritical steam generators are frequently used for the production of electric power. They operate at supercritical pressure. In contrast to a "subcritical boiler", a supercritical steam generator operates at such a high pressure (over 3,200 psi or 22.06 MPa) that actual boiling ceases to occur, the boiler has no liquid water - steam separation.
The plant has nine power generating units, unit# 5 to 9 involves super-critical boiler technology. In July 2012 Adani Power have requested Central Electricity Regulatory Commission to increase the power tariff due to increase in price of coal imported from Indonesia.
Supercritical designs have efficiencies in the low to mid 40% range, with new "ultra critical" designs using pressures above 4,400 psi (30 MPa) and multiple stage reheat reaching 45–48% efficiency. [6]
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