Patent ID: 8828340
Filing Date: 2014-09-09
Classification: B01D,F23J

Abstract:
1. A method for reducing combustion emissions produced during normal operating conditions in a combustion system having a gas flowpath that travels sequentially from a combustion chamber through an air preheater, a particulate collection device, and a spray dryer absorber to a baghouse downstream of the spray dryer absorber, the method comprising: mixing a dry calcium hydroxide powder into a flue gas at an injection location downstream of the combustion chamber and upstream of the baghouse; spraying water into the flue gas in the spray dryer absorber to humidify and reduce the temperature of the flue gas; and passing the flue gas through the baghouse, wherein the calcium hydroxide powder captures pollutants in the flue gas; wherein the injection location is upstream of the air preheater, or the injection location is between the spray dryer absorber and the baghouse.