The application of Selective Catalytic Reduction (SCR) to control nitric oxides (NOx) in diesel engines (2010, Tier 2, Bin5) introduced significant amounts of Ammonia (NH3) and Urea to the NOx exhaust gas analyzers and sampling systems. Under some test conditions, reactions in the sampling system precipitate a white powder, which can accumulate to block sample lines, rendering the exhaust emission sampling inoperable. NOx gas analyzers used for exhaust measurement are also susceptible to precipitation within the sample path and detector components. The contamination requires immediate maintenance for powder removal to restore baseline performance.The results of experiments to eliminate the powder are presented. Analysis of the powder identifies it as ammonium nitrate (NH4NO3) and ammonium sulfate ((NH4)2SO4), which is consistent with the white crystalline precipitate. Techniques to eliminate or minimize the condensation of the ammonia salts are presented, including removing gaseous ammonia on a phosphoric acid (scrubbing) filter, and maintaining the NOx analyzer and sample lines at a temperature greater than the melting point of the ammonia salts. A review of the temperature dependent crystallization of ammonium nitrate provides an estimate of the condensation rate based on gas concentrations and temperatures.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Investigation of Crystalline Powder Precipitates Observed in Engine Exhaust Emission Measurement Systems and NOx Exhaust Gas Analyzers


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Zummer, Robert (Autor:in) / Porter, Scott (Autor:in) / Nevius, Tim (Autor:in)

    Kongress:

    SAE 2016 World Congress and Exhibition ; 2016



    Erscheinungsdatum :

    05.04.2016




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Investigation of Crystalline Powder Precipitates Observed in Engine Exhaust Emission Measurement Systems and NOx Exhaust Gas Analyzers

    Zummer, Robert / Nevius, Tim / Porter, Scott | British Library Conference Proceedings | 2016


    Characteristics of exhaust-gas analyzers

    Dilworth, J.L. | Engineering Index Backfile | 1941


    Characteristics of EXHAUST - GAS ANALYZERS

    DlLWORTH, J. L. | SAE Technical Papers | 1941


    Analyzers for methane in exhaust gas

    Prostak,A. / Reschke,G.D. / General Motors,Milford Veh.Emiss.Lab.,US | Kraftfahrwesen | 1977


    Analyzers for Methane in Exhaust Gas

    Prostak, Arnold / Reschke, Glenn D. | SAE Technical Papers | 1977