method for reducing nitrogen oxide emissions in the combustion of solid fuels.

摘要

PCT No. PCT/DE90/00985 Sec. 371 Date Aug. 26, 1991 Sec. 102(e) Date Aug. 26, 1991 PCT Filed Dec. 21, 1990 PCT Pub. No. WO91/10097 PCT Pub. Date Jul. 11, 1991.In a process for reducing the nitric oxide emission during the combustion of solid fuels, the flue gases leaving from a main combustion zone (2) consecutively flow through two reduction zones (6,9). The first reduction zone (6) is operated hypostoichiometrically at temperatures above 1,000 DEG C. and while adding a reducing fuel, while the second reduction zone (9) is operated hyperstoichiometrically at temperatures from 950 DEG C. to 1,000 DEG C. and in the presence of nitric oxide-reducing substances.