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| Effects of Polyoxymethylene Dimethyl Ether Blending Ratio on Diesel Engine Performance and Aftertreatment System of Diesel Oxidation Catalyst+Catalytic Diesel Particulate Filter |
| DOI：10.13949/j.cnki.nrjgc.2021.02.006 |
| Key Words:diesel engine polyoxymethylene dimethyl ether (PODE) diesel oxidation catalyst (DOC) catalytic diesel particulate filter (CDPF) |
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| Abstract:Taking D30 diesel engine equipped with high pressure common rail and the diesel oxidation catalyst(DOC) + catalytic particulate filter(CDPF) after-treatment system as a research engine, and using diesel fuel mixed with 0%, 10%, and 30% polymethoxy dimethyl ether(PODE) as fuels of P0, P10 and P30, the effects of PODE blending ratio on the performance of diesel engine and after-treatment system were studied through engine bench test. The results showed that at load conditions, with the increase of the blending ratio of PODE, the brake specific fuel consumption increased. At low speed and high load, the brake thermal efficiency with P30 fuel was the highest among all the blended fuels. The blending of PODE significantly deteriorated NOx and HC emissions, and only lowered the specific emission of CO by about 33% at low speeds. At 1 600 r/min, the blended fuel effectively reduced the smoke emissions of diesel engine, but the aftertreatment system had a significant temperature increase, and the efficiency of converting NO to NO2 was reduced. At 2 400 r/min, with the increase of the blending ratio, the concentration of NO2 at the rear end of CDPF increased. Compared with P0 and P10 fuels, P30 fuel lowered the temperature after turbocharger by about 30 ℃. The higher the blending ratio of PODE, the lower the exhaust pressures before DOC and CDPF, thus reducing the risk of CDPF carrier blockage. |
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