Boosted Over Fire Air
A BOFA (Boosted Over Fire Air) plant has been installed at Ratcliffe Power Station in order to comply with the Large Combustion Plant Directive and lower our inpact on the environment by reducing emissions of Nitrogen Oxides (NOx) into the atmosphere. As a result of the combustion process, NOx is released, however, the installation of the BOFA technology means emissions of NOx are reduced to less than 500 milligrams per cubic metre.
BOFA works by forcing air into a higher section of the boiler. This causes coal to burn at a lower temperature and as a result reduces the amount of NOx which is produced.The over fire air which is injected into the boiler above the main burner mixes with the tails of the flames and this increases the area available for nitrogen oxide levels to be reduced. The boosted air is transported from the secondary air duct to the air duct at the top of the boiler by two fans found at the basement of the boiler.
