foerfarande foer minskning av utslaeppen av kvaeve - och svaveloxider vid foerbraenning av kvaeve - och svavelhaltigt braensle.

摘要

PCT No. PCT/Fi86/00098 Sec. 371 Date May 14, 1987 Sec. 102(e) Date May 14, 1987 PCT Filed Sep. 19, 1986 PCT Pub. No. WO87/01790 PCT Pub. Date Mar. 26, 1987.The invention relates to a method for decreasing emissions of nitrogen oxides and sulfur oxides when burning fuel which contains nitrogen and sulfur. According to the invention this is carried out by feeding fuel (4) and oxygen-containing gas (5) into a combustion reactor (1) the temperature of which is preferably 900 DEG -1500 DEG C., and that the combustion gases formed are directed into a suspension reactor (2) the temperature of which is preferably 750-1050 DEG C. and into which a pulverous material which binds sulfur oxides is fed so that the suspension density is 1-200 kg/m3, the oxygen concentration in the combustion reactor (1) and the suspension reactor (2) being controlled so that their total air coefficient is about 0.65-2, whereafter the gases are directed into an after-treatment reactor (3), into which oxygen-containing gas (12) is fed in order to adjust the oxygen concentration in the flue gases so that the residual oxygen concentration in the flue gases (13) emerging from the after-treatment reactor is 0.5-16, preferably 1-6% by volume.