Sökning: "urea deposits"

Hittade 4 uppsatser innehållade orden urea deposits.

  1. 1. CFD-simulations of urea-waterspray in an after-treatment systemusing Star-CCM+

    Master-uppsats, KTH/Mekanik

    Författare :Emelie Trigell; [2018]
    Nyckelord :after-treatment systems; selective catalytic reaction SCR ; AdBlue; multiphase flow; multi-component liquid; Unsteady Reynolds Average Navier Stokes RANS ; wall film formation; solid deposits; efterbehandlingssystem; selektiva katalytiska reaktioner; AdBlue; flerfasstr ¨ommning; flerkomponentvätska; Unsteady Reynolds Average Navier Stokes; väggfilm; avlagringar;

    Sammanfattning : The legislation has forced the vehicle industry to reduce tail-end emissions. The air pollutant nitrogen oxide (NOX) has been shown to have a negative impact on human health and the environment. One of the key technologies to reduce the levels of NOX emitted from a vehicle is by implementing an after-treatment system. LÄS MER

  2. 2. Optimization of the AdBlue e vaporation module for Scania V8 engines

    Master-uppsats, KTH/Maskinkonstruktion (Inst.)

    Författare :Mattia Antoniotti; [2017]
    Nyckelord :CR; evaporation unit; urea deposits; heat fins; Urea; förångningsmodulen; ureaavlagringar; rörflänsar;

    Sammanfattning : The aftertreatment techniques introduced to follow the emission legislations require a constant improvement process to comply with the gradually more stringent demands. SCR is the system used nowadays to deal with NOx emissions in most heavy-duty vehicles. LÄS MER

  3. 3. Investigating Urea Vaporization in a Controlled Environment Using Infrared Thermography

    Master-uppsats, KTH/Skolan för kemivetenskap (CHE)

    Författare :Henrik Grimler; [2015]
    Nyckelord :AdBlue; Infrared; Film; Evaporation; Deposits;

    Sammanfattning : As the emission legislation becomes more stringent, higher demands are put on the aftertreatment system in trucks. For dealing with nitrous oxides, AdBlue® (urea–water solution) is injected into the exhausts which evaporates and reduces nitrous oxides to nitrogen. LÄS MER

  4. 4. Investigation of urea deposit formation in vehicles with Selective Catalytic Reduction system

    H-uppsats, Chalmers tekniska högskola/Institutionen för tillämpad mekanik

    Författare :Lars Wallin; Tobias Holmström; [2014]
    Nyckelord :Urea deposits; urea injection; selective catalytic reduction; diesel exhaust aftertreatment; heat transfer model; AdBlue;

    Sammanfattning : In order to reduce NOX emissions from a diesel engine a urea-water solution called AdBlue is injected into the exhaust system. Risk of deposit formation is high due to unwanted side reactions that may occur during the decomposition of AdBlue during transient engine operation. LÄS MER