Influence of structural and operating factors on performance degradation of the diesel particulate filter based on composite regeneration

Zhang, Bin; Jiaqiang, E; Gong, Jinke; Yuan, Wancheng; Xin, Zhao; Hu, Wenyu

doi:10.1016/j.applthermaleng.2017.04.155

Cited by 99 publications

(19 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can contain a lean NOx trap (LNT), a diesel particulate filter (DPF), a diesel oxidation catalyst (DOC), and a selective catalytic reduction (SCR) system in addition to other components, is capable of reducing emissions; however, it also causes a pressure drop that affects the fuel consumption and dynamic performance of the engine [4]. A conventional particulate filter consists of an inlet pipe, an inlet cone (diffuser), a monolith substrate, an outlet cone (nozzle) and an outlet pipe [5]. The monolith substrate is either ceramic or metallic and comprises numerous parallel narrow channels (on the order of 1 mm) that increase the area of the surface on which either filtration or reactions occur.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Flow Field from Connection Cones to Monolith Reactors

Sjöblom

Ström

et al. 2019

Energies

View full text Add to dashboard Cite

The connection cones between an exhaust pipe and an exhaust after-treatment system (EATS) will affect the flow into the first monolith. In this study, a new streamlined connection cone using non-uniform rational B-splines (NURBS) is applied to optimize the flow uniformity inside two different monoliths (a gasoline particulate filter and an un-coated monolith). NURBS and conventional cones were created using 3D printing with two different cone angles. The velocities after the monolith were collected to present the uniformity of the flows under different cones and different velocities. The test results indicate that NURBS cones exhibit better performance. Furthermore, all of the pressure drops of the bench test were measured and compared with those of the conventional cones, demonstrating that the NURBS cones can reduce the pressure drop by up to 12%. The computer fluid dynamics simulations depict detailed changes in the flow before and after entering the monolith. The results show that the NURBS cone avoids the generation of a recirculating zone associated with conventional cones and creates a more uniform flow, which causes a lower pressure drop. Meanwhile, the package structure of the NURBS cone can reduce the space requirements. Finally, the implications of the flow distributions are discussed.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis of the Flow Field from Connection Cones to Monolith Reactors

Sjöblom

Ström

et al. 2019

Energies

View full text Add to dashboard Cite

show abstract

“…While for middle and outlet regions, the reductions reached 23.30% and 20.01%, respectively. The main reason is that the CDPF aging led to agglomeration and sintering of the noble metal catalyst on the carrier, resulting in a reduction in the main active components such as Pt and Pt 4+ 41 . However, the inlet part of CDPF is always subject to higher exhaust temperature of the diesel engine compared with other parts of the CDPF, the thermal aging degree is deeper, therefore leading to larger reduction in the Pt and Pt 4+ concentration.…”

Section: Resultsmentioning

confidence: 99%

Study of spatial and temporal aging characteristic of catalyzed diesel particulate filter catalytic performance used for diesel vehicle

Zhang

Lou

Tan

et al. 2020

Sci Rep

View full text Add to dashboard Cite

Catalyzed diesel particulate filters (CDPFs) have been widespread used as a technically and economically feasible mean for meeting increasingly stringent emissions limits. An important issue affecting the performance of a CDPF is its aging with using time. In this paper, the effects of noble metal loadings, regions and using mileage on the aging performance of a CDPF were investigated by methods of X-ray diffraction (XRD), X-ray photoelectron spectroscopy and catalytic activity evaluation. Results showed that aging of the CDPF shifted the XRD characteristic diffraction peaks towards larger angles and increased the crystallinity, showing a slowing downward trend with the increase of the noble metal loadings. In addition, the increase of the noble metal loading would slow down the decline of Pt and Pt4+ concentration caused by aging. The characteristic temperatures of CO, C3H8 conversion and NO2 production increased after aging, and the more the noble metal loadings, the higher the range of the increase. But noticeably, excessive amounts of noble metals would not present the corresponding anti-aging properties. Specifically, the degree of aging in the inlet region was the deepest, the following is the outlet region, and the middle region was the smallest, which were also reflected in the increase range of crystallinity, characteristic temperatures of CO, C3H8 conversion and NO2 production, as well as the decrease range of Pt and Pt4+ concentrations. The increase of aging mileage reduced the size of the aggregates of the soot and ash in CDPFs, however, improved the degree of tightness between particles. Meanwhile Carbon (C) concentration in the soot and ash increased with the aging mileage.

show abstract

“…Due to the influences of train service environment 23,24 and time, the brake system shows different brake performances under different conditions, such as abnormal brake stage signal, vehicle load fluctuations, and emergency braking trigger, and it will also show different brake cylinder pressure curves. Based on the statistical analysis of the historical data of service train, it can be seen that the standard brake cylinder pressure curve ( Figure 5) shape includes brake preparations, brake setup time, maximum brake cylinder pressure, brake hold pressure, and brake release speed.…”

Section: Performance Degradationmentioning

confidence: 99%

Performance degradation monitoring based on data fusion method for in-service train pneumatic brake system

Zuo

Ding

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

In order to monitor the brake performance degradation state of the in-service train pneumatic brake system, a data fusion method based on data processing and correlation analysis is proposed in this paper. By using the principal component analysis and analytic hierarchy process to analyze the historical on-board data of one subway line in China, five major indicators of the brake cylinder pressure curve based on seven principal signals are extracted, and the analytic hierarchy model of pneumatic brake system is established. Meanwhile, a standard brake cylinder pressure curve fast fitting tool programmed with MATLAB can realize the rapid curve fitting of historical on-board data under different vehicles, loads, and stations for a domestic subway line, and the algorithm has been validated by the normal and degradation data. By this way, the in-service train pneumatic brake performance degradation state is monitored through the deviation analysis between the standard curve and the fitting one. The method proposed in this paper is also suitable for the analysis of the pneumatic brake system performance of other rail transit trains.

show abstract

Influence of structural and operating factors on performance degradation of the diesel particulate filter based on composite regeneration

Cited by 99 publications

References 54 publications

Analysis of the Flow Field from Connection Cones to Monolith Reactors

Analysis of the Flow Field from Connection Cones to Monolith Reactors

Study of spatial and temporal aging characteristic of catalyzed diesel particulate filter catalytic performance used for diesel vehicle

Performance degradation monitoring based on data fusion method for in-service train pneumatic brake system

Contact Info

Product

Resources

About