Effects of polyoxymethylene dimethyl ethers/diesel blends on emissions of diesel engine
TIAN Jing1,2, CAI Yi-xi1, PU Xiao-yu1, GU Lin-bo1, SHI Yun-xi1
1. School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China; 2. School of Mechanical and Electrical Engineering, Xuzhou Institute of Technology, Xuzhou 221018, China
Abstract：The aim of this study was to evaluate the effect of polyoxymethylene dimethyl ethers (PODE)/diesel blends on particle size distribution and filtering efficiency of different modes of particulate matter (PM). The emission experiments were carried out on a diesel engine without any modification fueled with PODE/diesel blends by volume ratio of 0%, 10%, 20% and 30% respectively, and nitrogen oxide (NOx) emission and particle size distribution were measured in the upstream and downstream of diesel particulate filter (DPF). The results showed that NOx emission increased as the load conditions increased from 10% to 50%, while it showed a decline before it increased close to 100% load conditions. Meanwhile, the NO2/NOx ratio increased with the increasing blending ratio of PODE in the blended fuel under various loads, which indicated that PODE played a positive role in PM reduction. PODE/diesel blends ratio of 20% presented the best performance on PM reduction. Under 100% load condition, the total particle number and the particle volume concentrations with PODE/diesel blends ratio of 20% was decreased by 18.93% and 31.27% respectively compared with the pure diesel. Blending PODE in diesel showed negative effect on the PM reduction by DPF, especially under the load conditions of 10%~50%, but the overall filtering efficiency was still more than 95%.
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