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A dual stage combustion system and process for achieving high fuel combustion efficiency and reduced nitric oxide emissions. Combustion is carried out in two stages. A first partial combustion carried out in an oxygen deficient atmosphere followed by a second complete carbon combustion in an oxidizi

A dual stage combustion system and process for achieving high fuel combustion efficiency and reduced nitric oxide emissions. Combustion is carried out in two stages. A first partial combustion carried out in an oxygen deficient atmosphere followed by a second complete carbon combustion in an oxidizing atmosphere. The second combustion step achieves complete fuel utilization, but generates a nitrogen oxide containing flue gas. The nitrogen oxide containing flue gas is passed to the first combustion step where it is removed by interaction with the partially combusted solids.

대표청구항 ▼

A process for staged combustion of solids containing combustible carbonaceous material and nitrogen comprising the steps of: passing said solids to a first combustion zone; adding sufficient oxygen confaining gas to said solids in said first combustion zone to partially combust said carbonaceous mat

A process for staged combustion of solids containing combustible carbonaceous material and nitrogen comprising the steps of: passing said solids to a first combustion zone; adding sufficient oxygen confaining gas to said solids in said first combustion zone to partially combust said carbonaceous material to produce partially combusted solids and flue gas; separating said partially combusted solids from said flue gas; passing said partially combusted solids to a second combustion zone; adding sufficient oxygen containing gas to said partially combusted solids in said second combustion zone to combust substantially all of said carbonaceous material to produce combusted solids and flue gas containing oxygen and nitrogen oxides; separating said combusted solids from said flue gas; passing said second combustion zone flue gas to said first cmbustion zone to provide said oxygen containing gas to said first combustion zone, wherein the carbonaceous material in said first combustion zone is partially combusted and the amount of nitrogen oxides in said flue gas is reduced by the interaction of the nitrogen oxides with said solids in said first combustion zone.