Effects of a Diesel Particulate Filter on Emission Characteristics of a China II Non-road Diesel Engine

Abstract

The emission standard of China's non-road diesel engines is experiencing the transition period from China II to China III, and the relative non-road diesel engine emission issues need to be urgently solved. As a kind of effective aftertreatment technology, a diesel particulate filter (DPF) has become increasingly important in non-road diesel engine emission research. To evaluate the emission characteristics of a non-road diesel engine retrofitted with a DPF, particulate matter (PM) and gaseous emissions emitted from a China II non-road diesel engine loaded with a DPF were investigated on the engine bench. The mass (specific emissions) and number concentrations of PM emissions were obtained by a DLS7200 mass collection system and matter CU-2 number instrument with and without a DPF, respectively. Additionally, gaseous emissions [NO x , CO, and hydrocarbon (HC)] were quantitatively analyzed with and without a DPF by a MEXA-7100EGR emission analysis chamber. Results showed that a DPF could lower the mass and number concentrations of PM emissions effectively. The mass trapping efficiency of PM was more than 90%, and the number trapping efficiency of PM was over 99% . NO x total specific emissions were not obviously influenced by a DPF. However, the emission ratio of NO 2 /NO x significantly increased by 10−30% compared to the situation without a DPF. Because of the oxidation catalyst of the diesel oxidation catalyst (DOC), the specific emissions of CO and HC decreased by more than 90%. Additionally, there was a substantial reduction of the free acceleration smoke value above 95% after installing a DPF. The DPF is one of the great technological routes that can readily make PM emissions of China II non-road diesel engines meet the emission demands of China IV.

The Oxidation Performance of a Carbon Soot Catalyst Based on the Pt-Pd Synergy Effect

“…As a result, the Diesel Particulate Filter (DPF) is an essential device in diesel exhaust treatment systems, capturing particles through a mixture of surface and internal filters using methods such as such as diffusion precipitation, inertial precipitation, and linear interception. DPFs can effectively purify 65-90% of the particulates in exhaust gas, making it one of the most effective and direct methods to purify the particulates produced by diesel vehicles [5]. However, with the accumulation of DPF running time and mileage, a large number of particles will accumulate and block the DPF, which will increase the exhaust back pressure and lead to the deterioration of engine power performance and economic performance.…”

Fuel economy benefits in internal combustion engines due to soot restructuring in the particulate filter by water injection

“…2 Despite the efforts to control engine-out particle emissions, the use of wall-flow particulate filters (PFs) has become the only viable and reliable way to fulfil the emission regulations for automotive, commercial and off-road machinery. 3–5…”

“…2 Despite the efforts to control engine-out particle emissions, the use of wall-flow particulate filters (PFs) has become the only viable and reliable way to fulfil the emission regulations for automotive, commercial and off-road machinery. [3][4][5] Wall-flow PFs consist of axial parallel channels alternatively plugged at each end. This pattern defines the operating principle, forcing the exhaust gas to pass through a porous wall where particulate matter is filtrated.…”

Construction of a Reduced Diesel/Polyoxymethylene Dimethyl Ether 3 (PODE3) Reaction Mechanism for Combustion and Emission Analysis

“…However, the inherent particulate matter (PM) emissions have attracted considerable attention worldwide since the 1990s . To control the PM mass and number, on the one hand, DOC and DPF are installed on diesel engines as exhaust after-treatment systems and, on the other hand, oxygenated fuels are applied as soot reduction additives for commercial diesel engines. , Among the oxygen-containing fuels, PODE 3 (CH 3 O­(CH 2 O) 3 CH 3 ) features a higher oxygen content (47.1 wt %), higher cetane number (CN), and lower viscosity than diesel fuels . Hence, it has been reported as a promising additive for diesel engines.…”