Capture and destruction of soot emissions from diesel engines used in power generation
- Northeastern Univ., Boston, MA (United States)
A method is described for reducing emissions from diesel engines. Particulate emissions are captured in the effluent duct using high-efficiency ceramic filters. The filters are regenerated (cleaned) with compressed air. Periodically, compressed air flows in the opposite to the exhaust direction in the filter and removes the soot. The soot is channeled to a chamber, fitted with a secondary filter, where it is oxidized. A slipstream of the filtered engine exhaust is channeled back to the engine intake (flue gas recirculation, FGR) to lower the peak temperatures in the cylinder and, thus, the nitrogen oxide emissions. A design for the soot incinerator - secondary filter chamber is presented herein. This design employs an electric burner and dual wall-flow filters. The system was mounted in a diesel vehicle and was tested for 700 km. The average sooting rate of the engine was 0.1 g/km. The baseline value of the pressure drop across the primary monolith was 150 mbars, after both the primary and secondary monoliths were regenerated. During testing the pressure drop across the primary monolith would gradually increase to a value of 400 mbars as soot particles were captured, and then decrease to a value of 200 mbars after every primary regeneration. The pressure drop would further decrease to the baseline value of 150 mbars when primary regeneration was performed after incineration in the secondary chamber was complete. Aerodynamic regeneration was performed every {approx}17 km and incineration of the soot particles occurred every {approx}64 km. The CO emissions created by the oxidation of the soot particles the incinerator were monitored at the tailpipe. To prevent these CO emissions from being released to the atmosphere the effluent of the incinerator was channeled back to the air intake manifold of the engine to oxidize CO to CO{sub 2}.
- Research Organization:
- Coal and Slurry Technology Association, Washington, DC (United States)
- OSTI ID:
- 585452
- Report Number(s):
- CONF-980309-PROC.; TRN: 98:001614-0099
- Resource Relation:
- Conference: 23. international technical conference on coal utilization and fuel systems, Clearwater, FL (United States), 9-13 Mar 1998; Other Information: PBD: 1998; Related Information: Is Part Of The proceedings of the 23rd International Technical Conference on Coal Utilization and Fuel Systems; Sakkestad, B.A. [ed.]; PB: 1143 p.
- Country of Publication:
- United States
- Language:
- English
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