Supercritical and Ultra-supercritical boiler combustion - Definition, glossary, details
Power generation efficiency
is increased by designing the unit for operation at higher steam temperature
and pressure. This represents a movement from subcritical to supercritical to
ultra-supercritical steam parameters. Supercritical steam cycles were not
commercialized until the late 1960s, after the necessary materials technologies
had been developed.
Under supercritical conditions,
the supercritical fluid is expanded through the high-pressure stages of a steam
turbine, generating electricity. To recharge the steam properties and increase
the amount of power generated, after expansion through the high-pressure
turbine stages, the steam is sent back to the boiler to be reheated. Reheat,
single or double, increases the cycle efficiency by raising the mean
temperature of heat addition to the cycle.
The efficiency of supercritical
boilers range from 37% to 40% depending on the design, operating parameters and
type of coal.
|Sleipner gas field||Slash and Burn||Saline Aquifers|
|Stripper||Soil Carbon||Soil Carbon Sequestration|
|Supercritical power plants||Sulphur Hexafluoride (SF6)||Structured Adsorbent|
|Smart Grid||Super Grid|