by Lauri Myllyvirta, AQA Advisor/Greenpeace, RenewEconomy
The coal industry and some power utilities have been talking up the supposed benefits of ultra-supercritical power plants – leading some decision-makers and commentators to mistakenly believe that the choice of ultra-supercritical technology for a power plant will substantially mitigate air pollution and carbon dioxide emissions.
To understand the difference between subcritical, supercritical and ultra-supercritical power generation technology on the air pollutant emissions from a coal-fired power plant, the most important thing to know is this: which type of steam cycle is used has no impact on the emissions per tonne of coal burned.
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