Process for the removal of nitrogen oxides and sulphur oxides from flue gases,申请号US19860924621-传众专利搜索

Process for the removal of nitrogen oxides and sulphur oxides from flue gases

申请公布号：US4781902(A)

申请号：US19860924621

申请日期：1986.10.29

申请公布日期：1988.11.01

申请人：

HALDOR TOPSOE A/S

发明人：SCHOUBYE, PETER C. S.

分类号：B01D53/00;B01D53/34;B01D53/75;B01D53/86;C01B17/74;C01B17/79;(IPC1-7):B01J8/00;C01B17/00;C01B21/00

主分类号：B01D53/00

摘要：The invention relates to a process for eliminating nitrogen oxides and sulphur oxides from a stream of flue gas containing nitrogen oxides and sulphur oxides comprising the steps of (a) adding ammonia to the stream of flue gas and contacting the resulting stream, at a temperature of 250 DEG -450 DEG C., with a reduction catalyst for selective reduction of nitrogen oxides into nitrogen and water, the molar ratio of ammonia to nitrogen oxides being in the range of 0.6-1.8, (b) contacting the stream from step (a), at a temperature of 300 DEG -470 DEG C., with an oxidation catalyst for oxidation of unreacted ammonia into nitrogen and water and simultaneous oxidation of sulphur dioxide into sulphur trioxide, and (c) cooling the stream from step (b) for condensation of sulphur trioxide in the form of sulphuric acid. The products of the process of the invention are steam, nitrogen, and concentrated sulphuric acid of commercial quality giving no waste disposal problems.