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Large Volume Inorganic Chemicals - Ammonia ... - ammk-rks.net

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Chapter 77.4.9 Multistage scrubbing of exhaust gas containing NO xDescriptionFor multistage scrubbing in NPK production, exhaust gases are collected from the followingsources:• phosphate rock digestion• separation/washing of sand• filtration/washing of Ca(NO 3 ) 2 . 4 H 2 O (CNTH).A 10 % AN solution is used as the scrubbing medium and is recycled to NPK production at asufficient concentration level. The sequence of feeding the exhaust gases to the scrubber ensuresthat the higher loaded gases pass through the greater number of scrubbing stages.Emission to airAN solution toNPK productionExhaust gas fromCNTH filtrationExhaust gas fromseparation of sandExhaust gas fromphosphate digestionCoolingNeutralisationNitritedecompositionNH 3SteamHeatingFigure 7.5: Multistage scrubbing of exhaust gases containing NO xFigure based on [9, Austrian UBA, 2002]312 <strong>Large</strong> <strong>Volume</strong> <strong>Inorganic</strong> <strong>Chemicals</strong> – <strong>Ammonia</strong>, Acids and Fertilisers

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