Patent ID: 7959435
Filing Date: 2011-06-14
Classification: B01D,C04B,F27B,F27D,Y02C

Abstract:
1. A method of operating a mineral processing kiln having an inclined rotary vessel, comprising: rotating the rotary vessel to advance mineral from an upper end of the inclined rotary vessel to a lower end of the inclined rotary vessel, introducing a stream of high-pressure air through an opening in a wall of the rotary vessel at a location between the upper end of the rotary vessel and the lower end of the rotary vessel, advancing, during rotation of the rotary vessel, a liquid SNCR reducing agent from a source that is remote from the rotary vessel, and introducing the liquid SNCR reducing agent into the stream of high-pressure air, wherein the mineral processing kiln further has (i) an air nozzle extending into the rotary vessel through the opening in the all of the vessel, (ii) an air pressurizer having an output coupled to the air nozzle, and (iii) a plenum coupled to an intake of the air pressurizer, the step of introducing the stream of high-pressure air includes drawing air from the plenum and introducing high-pressure air through the nozzle with the air pressurizer, and the step of introducing the liquid SNCR reducing agent includes (i) introducing the liquid SNCR reducing agent into the plenum, (ii) pyrolyzing the liquid SNCR reducing agent to a gaseous state in the plenum, and (iii) drawing the gaseous SNCR reducing agent from the plenum and introducing the gaseous SNCR reducing agent through the nozzle with the air pressurizer.