What's this clean coal technology that John McCain keeps talking about?Explain the process and everything and why it's named that. I think I found an answer. Coal cleaning by 'washing' has been standard practice in developed countries for some time. It reduces emissions of ash and sulfur dioxide when the coal is burned. Electrostatic precipitators and fabric filters can remove 99% of the fly ash from the flue gases – these technologies are in widespread use. Flue gas desulfurisation reduces the output of sulfur dioxide to the atmosphere by up to 97%, the task depending on the level of sulfur in the coal and the extent of the reduction. It is widely used where needed in developed countries. Low-NOx burners allow coal-fired plants to reduce nitrogen oxide emissions by up to 40%. Coupled with re-burning techniques NOx can be reduced 70% and selective catalytic reduction can clean up 90% of NOx emissions. Increased efficiency of plant – up to 45% thermal efficiency now (and 50% expected in future) means that newer plants create less emissions per kWh than older ones. Advanced technologies such as Integrated Gasification Combined Cycle (IGCC) and Pressurised Fluidised Bed Combustion (PFBC) will enable higher thermal efficiencies still – up to 50% in the future. Ultra-clean coal from new processing technologies which reduce ash below 0. 25% and sulfur to very low levels mean that pulverised coal might be fed directly into gas turbines with combined cycle and burned at high thermal efficiency. Gasification, including underground gasification in situ, uses steam and oxygen to turn the coal into carbon monoxide and hydrogen. Sequestration refers to disposal of liquid carbon dioxide, once captured, into deep geological strata.
More than half of the nation's electricity comes from coal. But even as new technologies and sources of energy are being developed to move the nation away fr. . .