Effects of Particulate Trap Filter on Diesel Engine Emission Characteristics

摘要

The present study was conducted to characterize emission from a heavy duty diesel engine equipped with a particulate trap filter (DPF). A city bus with a wall-flow monolith particulate trap filter and bypass system was tested under steady state operating conditions for comparison of regulated and unregulated emissions. Furthermore, gas and particulate emissions during regeneration treatment with electric heater were measured. Diesel exhaust particulate nd volatile organic matter were collected from the diluted exhaust gas with fluorocarbon coated glass fiber filters and amberlite XAD-2 resin respectively. The filters and resin were extracted with dichloromethane using Soxhlet extraction to collect the soluble organic fraction of particulate matter (SOF) and volatile organic matter (VOM). The SOF and the VOM were chemically analysed and their mutagenicity was evaluated with a modified Ames assay. DPF was effective for the reduction of particulate matter including PAH and mutagenic compounds. Particulate matter emitted during regeneration of DPF mostly consisted of SOF containing PAH, which showed mutagenicities.