An analysis of field-aged diesel particulate filter performance: particle emissions before, during, and after regeneration
| Autor: | John M. E. Storey, Norberto Domingo, Teresa L Barone |
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| Rok vydání: | 2010 |
| Předmět: |
Diesel particulate filter
Chemistry Environmental engineering Analytical chemistry Temperature Air Pollutants Occupational Management Monitoring Policy and Law Particulates medicine.disease_cause Soot Condensation particle counter Aerosol Scanning mobility particle sizer Air Pollution Ultrafine particle Particle-size distribution medicine Pressure Particulate Matter Particle Size Waste Management and Disposal Filtration Gasoline Environmental Monitoring Vehicle Emissions |
| Zdroj: | Journal of the AirWaste Management Association (1995). 60(8) |
| ISSN: | 1096-2247 |
| Popis: | A field-aged, passive diesel particulate filter (DPF) employed in a school bus retrofit program was evaluated for emissions of particle mass and number concentration before, during and after regeneration. For the particle mass measurements, filter samples were collected for gravimetric analysis with a partial flow sampling system, which sampled proportionally to the exhaust flow. Total number concentration and number-size distributions were measured by a condensation particle counter and scanning mobility particle sizer, respectively. The results of the evaluation show that the number concentration emissions decreased as the DPF became loaded with soot. However after soot removal by regeneration, the number concentration emissions were approximately 20 times greater, which suggests the importance of the soot layer in helping to trap particles. Contrary to the number concentration results, particle mass emissions decreased from 6 1 mg/hp-hr before regeneration to 3 2 mg/hp-hr after regeneration. This indicates that nanoparticles with diameter less than 50 nm may have been emitted after regeneration since these particles contribute little to the total mass. Overall, average particle emission reductions of 95% by mass and 10,000-fold by number concentration after four years of use provided evidence of the durability of a field-aged DPF. In contrast to previous reportsmore » for new DPFs in which elevated number concentrations occurred during the first 200 seconds of a transient cycle, the number concentration emissions were elevated during the second half of the heavy-duty federal test procedure when high speed was sustained. This information is relevant for the analysis of mechanisms by which particles are emitted from field-aged DPFs.« less |
| Databáze: | OpenAIRE |
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