Patent ID: 7497172
Filing Date: 2009-03-03
Classification: F23C,F23G,F23J,F23L,Y02E,Y10S

Abstract:
1. A method of removing mercury and NO x from flue gas produced by combustion devices burning mercury and chlorine containing fuel, the flue gas passing from a combustion zone in which the temperature exceeds 2600° F., through a first temperature zone in which the temperatures range from 1750° F. to 2100° F., through a second temperature zone in which the temperatures range from 900° F. to 1450° F., and through a particle removal device, the method comprising: selecting a reburn fuel containing carbon; preparing a slurry of the reburn fuel and water wherein a ratio of water to reburn fuel is such that when the slurry is injected into the flue gas prior to the first temperature zone where the temperature exceeds 2100° F. and combustion is occurring, a first portion of the reburn fuel will gasify and then will combine with a portion of the NO injecting the slurry into the flue gas prior to the first temperature zone where the temperature exceeds 2100° F. and combustion is occurring, where the first portion of the reburn fuel gasifies and subsequently combines with a portion of the NO passing the flue gas and activated carbon particles through the second temperature zone where the mercury and chlorine present in the flue gas as a result of combustion of the mercury and chlorine containing fuel will combine because of the presence of the activated carbon particles to form HgCl directing the flue gas to the particle removal device for removal of the activated carbon particles.