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.

Other Terms

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

Power Plant CCS - Glossary

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