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Technical Paper

Particulate Trap Technology Demonstration at New York City Transit Authority, 1992

1992-02-01
920138
Recent emission and field data from diesel particulate trap buses operating at the New York City Transit Authority (NYCTA) are summarized. As part of the NYCTA Trap Oxidizer Program, transient emission and performance test data were measured from a prototype diesel particulate trap system, which utilizes a Webasto in-line full flow diesel burner to periodically regenerate the ceramic monolith filter. In addition, the progress made during a large scale field test program of 398 new TMC RTS buses powered with Detroit Diesel Corporation (DDC) 6V-92TA bus engines equipped with Donaldson Company, Inc. (DCI) Dual Wallflow Monolith Electric Regeneration Trap System is presented. Discussion includes: trap system hardware and software issues, resulting trap system improvements, impact of the trap system on engine emissions and fuel economy, and potential trap monolith durability issues.
Technical Paper

Performance Testing and Field Evaluation of an In-Line Full-Flow Particulate Trap System for the DDC 6V-92TA Two Stroke Engine

1992-02-01
920366
Particulate control technology for heavy-duty diesel engines is of increasing interest. This paper describes a fully automatic, in-line full-flow Burner Diesel Particulate Filter System developed by Kloeckner-Humboldt-Deutz AG (KHD). The system was fully optimized in a transient test cell by ORTECH International for the Detroit Diesel 2-stroke 6V-92TA engine. The important parameters such as the fuel coefficients and exhaust backpressure coefficients were developed in the test cell. Transient emissions tests were conducted showing approximately 85% particulate trapping efficiency. The trap operated fully automatically. Regeneration was triggered when the exhaust backpressure had exceeded a predetermined level for a cumulative period of 3 minutes. The regeneration process on average took approximately 7-½ minutes to complete. The frequency of regeneration was approximately once every 4 hours.
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