公开(公告)号：US4971777A

公开(公告)日：1990-11-20

申请号：US271094

申请日：1988-11-14

申请人： Bernhard Firnhaber ,  Karl Schmid ,  Cort Starck ,  Hans-Werner Gosch ,  Richard Wenderoth ,  Rolf Wetzel ,  Wolfgang Schulte

发明人： Bernhard Firnhaber ,  Karl Schmid ,  Cort Starck ,  Hans-Werner Gosch ,  Richard Wenderoth ,  Rolf Wetzel ,  Wolfgang Schulte

IPC分类号： B01D53/56 ,  B01D53/60 ,  B01D53/68 ,  B01D53/77

CPC分类号： B01D53/56 ,  B01D53/60 ,  B01D53/68

摘要： The process removes acid components including sulfur oxides and nitrogen oxides from the exhaust gases of industrial furnaces and includes oxidizing the nitrogen oxide contained in the exhaust gases with the oxygen contained in the exhaust gases at a exhaust gases temperature between 300.degree. and 900.degree. C. before entry of the gases into a first absorption stage, with an addition to the exhaust gases of an organic compound, preferably methanol, as a radical former. After oxidation of nitrogen oxides the exhaust gases undergo a two-stage absorption using aqueous ammonium salt solutions as absorption liquid, whose pH-value is continuously adjusted to less than 5 by addition of aqueous ammonia solution. The mol ratio of NO.sub.2 to SO.sub.2 in the exhaust gases introduced to the second absorption stage is maintained between 0.01 and 0.5 by diverting a portion of the exhaust gases prior to the first absorption stage to the second absorption stage. The salt solutions obtained thereby are neutralized together and evaporated, whereby the salts so produced, after pelletization or granulation represent a useful fertilizer.

摘要翻译： 该方法从工业炉排气中除去含硫氧化物和氮氧化物的酸组分，包括在排气温度在300-900℃之间用废气中所含的氧氧化废气中所含的氮氧化物。 在气体进入第一吸收阶段之前，加入有机化合物（优选甲醇）的废气作为基团前体。 在氧化氮氧化物之后，废气通过使用含水铵盐溶液作为吸收液进行二阶段吸收，其pH值通过加入氨水溶液连续地调节到小于5。 通过将第一吸收阶段之前的一部分排气转移到第二吸收阶段，引入第二吸收阶段的废气中的NO 2与SO 2的摩尔比保持在0.01至0.5之间。 将由此得到的盐溶液中和在一起并蒸发，由此在造粒或造粒后生成的盐代表有用的肥料。