Experimental study on the effects of blending PODEn on performance, combustion and emission characteristics of heavy-duty diesel engines meeting China VI emission standard

Abstract

To study the influence of diesel fuel blended with polyoxymethylene dimethyl ethers (PODEn), a new alternative fuel with a high oxygen content and large cetane number, on the combustion characteristics, fuel economies, and emission characteristics of heavy-duty diesel engines that meet China VI emission standards, relevant tests were conducted on a supercharged intercooled high-pressure common-rail diesel engine. The PODEn were blended with diesel fuel at three different ratios (volume fractions of 10%, 20%, and 30%). The test results showed that the PODEn could optimize the combustion process of diesel engines that met the China VI emission standards, effectively improve the thermal efficiencies of diesel engines, and reduce the emissions of hydrocarbon (HC), carbon monoxide (CO), and soot. With an increase in the PODEn blending ratio, the peak values of the in-cylinder pressure, average in-cylinder temperature, and instantaneous heat release rate gradually decreased, and each peak progressively moved forward. As the start of combustion gradually moved forward, the combustion duration was shortened by 0.7–2.8°CA, the heat release process became more concentrated, and the effective thermal efficiency was increased by up to 2.57%. The effective fuel consumption gradually increased, yet the equivalent effective fuel consumption gradually decreased, with the largest drop being as high as 4.55%. The nitrogen oxides (NOx) emission increased slightly, and the emissions of HC, CO, and soot gradually decreased. The emissions of CO and soot declined significantly under high-speed and high-load conditions, with the highest reductions reaching 66.2% and 76.3%, respectively.

Filtration Efficiency and Regeneration Behavior in a Catalytic Diesel Particulate Filter with the Use of Diesel/Polyoxymethylene Dimethyl Ether Mixture

“…Another work [15] showed that under the speed of 2400 rpm and a full load condition, the smoke emissions of P10 (90 vol% diesel and 10 vol% PODE n ), P20, and P30 (70 vol% diesel and 30 vol% PODE n ) decreased by 29.7%, 67.8%, and 82.4%, respectively, in comparison with diesel fuel. The consistent trends that PODE n addition effectively reduced soot and PM emissions can be widely seen in [16][17][18]. In addition, adding PODE n also significantly decreased the total particulate number concentrations (PNCs) as expected.…”

Diesel particulate filter regeneration mechanism of modern automobile engines and methods of reducing PM emissions: a review

“…High concentration particulate matter (PM) in the air has always been one of the serious threats to human health and ecological environment (Zhang et al 2016a ) (Wang et al 2020a ). With the deepening of globalization, the proportion of transportation industry in PM emission is increasing (Zhao et al 2021 ) (Zhao et al 2019a ). Although influenced by the trend of future transportation energy reform (electrification and hybrid), the diesel engines still occupy a considerable part of the market share by virtue of fuel economy, operation reliability and high stability (Zhao et al 2018 ) (Zhang et al 2022e ) (Cai and Zhao 2022b ) (Ji et al 2014 ) (Cai and Zhao 2022e ).…”

Engine performance and emissions evaluation of surfactant-free B30 biodiesel–diesel/water emulsion as alternative fuel

“…Secondly, it is possible that due to higher combustion temperature promoted by common rail fuel injection coupled with a turbocharged induction air intake system, micro explosion of minute water particles in B30E emulsions could not effectively reduce combustion temperature in a magnitude observed in previous studies. These assertions were substantiated in a separate study which documented that a common rail turbocharged engine fueled with polyoxymethylene dimethyl ethers-diesel, a highly oxygenated fuel, was unable to effectively suppress NO x formation under various engine loads 50 .

Figure 7 NO x emission of test fuels at different engine loads.

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