Control of diesel gaseous and particulate emissions with a tube-type wet electrostatic precipitator
| Autor: | Tim C. Keener, Soon-Jai Khang, Mingming Lu, Phirun Saiyasitpanich, Fuyan Liang |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Carbon Monoxide
Diesel exhaust Chemistry Electrostatic precipitator Exhaust gas Management Monitoring Policy and Law Particulates Diesel engine Hydrocarbons Diesel fuel Ozone Environmental chemistry Air Pollution Electrochemistry Nitrogen Oxides Particulate Matter Diesel exhaust fluid Waste Management and Disposal NOx Vehicle Emissions |
| Zdroj: | Journal of the AirWaste Management Association (1995). 58(10) |
| ISSN: | 1096-2247 |
| Popis: | In this study, experiments were performed with a bench-scale tube-type wet electrostatic precipitator (wESPs) to investigate its effectiveness for the removal of mass- and number-based diesel particulate matter (DPM), hydrocarbons (HCs), carbon monoxide (CO), and oxides of nitrogen (NOx) from diesel exhaust emissions. The concentration of ozone (O3) present in the exhaust that underwent a nonthermal plasma treatment process inside the wESP was also measured. A nonroad diesel generator operating at varying load conditions was used as a stationary diesel emission source. The DPM mass analysis was conducted by means of isokinetic sampling and the DPM mass concentration was determined by a gravimetric method. An electrical low-pressure impactor (ELPI) was used to quantify the DPM number concentration. The HC compounds, n-alkanes, and polycyclic aromatic hydrocarbons (PAHs) were collected on a moisture-free quartz filter together with a PUF/XAD/PUF cartridge and extracted in dichloromethane with sonication. Gas chromatography (GC)/mass spectroscopy (MS) was used to determine HC concentrations in the extracted solution. A calibrated gas combustion analyzer (Testo 350) and an O3 analyzer were used for quantifying the inlet and outlet concentrations of CO and NOx (nitric oxide [NO] + nitrogen dioxide [NO2]), and O3 in the diesel exhaust stream. The wESP was capable of removing approximately 67-86% of mass- and number-based DPM at a 100% exhaust volumetric flow rate generated from 0- to 75-kW engine loads. At 75-kW engine load, increasing gas residence time from approximately 0.1 to 0.4 sec led to a significant increase of DPM removal efficiency from approximately 67 to more than 90%. The removal of n-alkanes, 16 PAHs, and CO in the wESP ranged from 31 to 57% and 5 to 38%, respectively. The use of the wESP did not significantly affect NOx concentration in diesel exhaust. The O3 concentration in diesel exhaust was measured to be less than 1 ppm. The main mechanisms responsible for the removal of these pollutants from diesel exhaust are discussed. |
| Databáze: | OpenAIRE |
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