Patent ID: 8108073
Filing Date: 2012-01-31
Classification: B01D,F01N,Y02T,Y10T

Abstract:
1. A method for controlling dosage of a reagent in a selective catalytic reduction (SCR) system comprising the steps of: a) providing the system with a plurality of reducing agent injection nozzles, each nozzle being configured and adapted to be independently calibrated during an SCR reaction when the system is in operation; b) determining an influence coefficient for each injection nozzle for a catalyst independently of the other injection nozzles, wherein the influence coefficient for each injection nozzle is based on a constant flow from the respective nozzle and a fraction of the constant flow that appears at each of a plurality of downstream grid points; and c) optimizing flow of reducing agent from each injection nozzle based on the influence coefficients to minimize a sum of deviation from the mean value of reducing agent to NO wherein: N=Number of Injection nozzles, M=Number of grid measurement points, X A B K AMM D η=NOx Reduction Efficiency.