Application of FBC-DPF on PM emissions control from diesel engine

There were few researches on emission characteristics of diesel engine retrofitted with fuel-borne catalyst diesel particulate filter (FBC-DPF), especially on effects of DPF on the PAHs emission from the exhaust. To comprehensively evaluate particulate matter (PM) emission characteristics of diesel engine retrofitted with FBC-DPF and PAH emission control performance, PM emissions emitted from a heavy-duty diesel engine loaded FBC-DPF were investigated on the engine test bench. PM number concentration and size distribution were obtained by Electrical Low Pressure Impactor with and without FBC-DPF respectively. Additionally, solid polycyclic aromatic hydrocarbons (PAHs) were sampled by fiberglass film filters and PAHs were quantitatively analyzed by gas chromatogragh-mass spectrometer (GC/MS). Results showed that, DPF substantially reduced the number concentration of PM, and the average filtering efficiency of particulate matter was approximately 95%. DPF also reduced brake specific emissions of PAHs with a high reduce of 25.0%-88.0% of PAHs. The number count mean diameter (CMD) of PM emission was 30-89 nm without FBC-DPF, while CMD of PM emission was 41-98 nm after the engine retrofitted FBC-DPF. FBC-DPF approximately increased the number count mean diameter of PM emitted from diesel engine by 38.2%. For China IV and Vstage emission standards, FBC-DPF is an effective method to remove the PM emission from the diesel exhaust, and it can significantly reduce the toxic ingredients in the exhaust. In addition, FBC-DPF can adapt to the fuel with high sulfur content.