PLANT AND METHOD FOR DRY EXTRACTING / COOLING HEAVY ASHES AND FOR CONTROLLING THE COMBUSTION OF HIGH UNBURNT CONTENT RESIDUES

摘要

The present invention relates to a system for dry extracting / cooling he avy ashes and for controlling the combustion of high unburnt content residue s, allowing to: extract heavy ash from the boiler bottom (12), foster and ad just post-combustion on the extractor belt (14) by combined use of comburent hot air and inert combustion fumes, already available in boiler, cool the a shes present on the belt and optionally re- circulating them - all or in par t - in boiler, along with the fraction of light ashes of higher unburnt cont ent.