| 摘要 |
In the improved apparatus for treating flue gases by irradiation with electron beams, ammonia is added at a position in the direction of the flue gas stream that is upstream of the center of electron beams applied within the reactor and which is not more than 2.5 times the range of electron beams, preferably not more than 2.0 times, more preferably not more than 1.5 times, most preferably from 0.5 to 1.0 times said range. Ammonia is supplied in any one of the following ways; (1) only ammonia is supplied; (2) both ammonia and air are supplied; (3) both ammonia and water are supplied; and (4) ammonia, air and water are all supplied. From an operational viewpoint, ammonia is preferably supplied as diluted in the form of a mixture of heated ammonia and dry air (having preferably a dew point of -15 DEG C or less at one atmosphere). It is also effective to supply ammonia through pipes that are arranged to contour the spherical divergence of electron beams. The apparatus reduces the addition of ammonia to the necessary minimum amount to meet two requirements simultaneously, one for improving the efficiency of denitration and the other for reducing the amount of leak ammonia to several tens of ppm. |
