Effects of Continuously Regenerating Diesel Particulate Filter on Characteristics of Particle Size Distribution from a Diesel Engine

Abstract:

A heavy diesel engine was tested on the engine test bench to analyze the two different particulate emissions results of the original engine and the engine with continously regenerating Diesel Particultc Filfer CRDPF equipment. Results show that the application of CRDPF increases the exhaust temperature. The particle number size distribution of original engine clearly shows a bimodal and lognormal. The particle number size distribution upstream of the CRDPF shows trimodal and turns into multimodal across the CRDPF. The test engine with CRDPF generates more particles in diameter below 191nm than the original one. The nuclei mode particles upstream of CRDPF give a larger fraction than the original one. Particulate emission decreases dramatically across the CRDPF except the particles in diameter ranging from 7nm to 15nm. The reduction ratio of accumulation mode particles is higher than that of nuclei mode particles. This leads to an increase in the proportion of nuclei mode particles downstream.