| 摘要 |
NH3 for injection into combustion gases to react with NOX, pref. in presence of a catalyst, is prepared as aq. soln. and sprayed into a stream of warm gas for evapn. before entering the fume conduit. The carrier gas may be deviated from the main fume stream, with any water droplets removed before rejoining the main stream. alternative carrier gases include a preheated flow of fresh air, or dried steam. For the higher temp. needed for denitrification without a catalyst, dried steam is pref. pressurised.
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