Abstract
The effects of a small quantity of ammonia (NH 3) added to exhaust gases containing nitrogen oxides (NO x ) and sulfur dioxide (SO 2), the characteristics of the NH 3 added to the gases to facilitate the removal of NO x and SO 2 when the gases were irradiated by electron beam were studied. The experiment was conducted in a pilot plant (capacity: 1000 Nm 3/h) for one and a half years. The Phenol Disulfonic Acid Method and the Arsenazo-III Method were used for NO x and SO x determination in the irradiated gases respectively. The NH 3 was added at either the reactor inlet or outlet and greatly improved the efficiency of NO x and SO 2 removal, and made the by-products stable. NO x and SO 2 removal were shown to be solely determined by total dose regardless of dose rate and residence time. A maximum efficiency of 90% was accomplished both in NO x and SO 2 removals. Under the most economical conditions, 80% of NO x and 75% of SO 2 were simultaneously removed with 80 ppm of NH 3 exhausted to the atmosphere. The amounts of nitrogen and sulfur in the gas before and after irradiation satisfactory balance under this condition. The collected products in the electrostatic precipitator are largely composed of a mixture of ammonium sulfate (NH 4) 2SO 4 and ammonium nitrate sulfate (NH 4) 2SO 4▿2NH 4NO 3 plus (NH 4) 2SO 4▿3NH 4NO 3.
Published Version
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