Emission reduction characteristics of a catalyzed continuously regenerating trap after-treatment system and its durability performance

Zhang, Yunhua; Lou, Diming; Tan, Piqiang; Hu, Zhiyuan; Li, Hu

doi:10.1016/j.jes.2019.05.001

Cited by 21 publications

(3 citation statements)

References 31 publications

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“…On the basis of the original DPF, the system is covered with a layer of catalyst, which is more favorable for the oxidation of soot. The CCRT system can reduce the CO and HC emissions by more than 60%, while the particle removal rate is more than 90% (Zhang et al 2019e ). The experiment was carried out by an off-road diesel engine, and it found that CCRT reduced more than 81% CO and 73% HC than a single CDPF device (Zhang et al 2019c ).…”

Section: Diesel Particulate Filter Regenerationmentioning

confidence: 99%

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

Zhang

Dong

Lan

et al. 2023

Environ Sci Pollut Res

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Diesel particulate filter (DPF) is considered as an effective method to control particulate matter (PM) emissions from diesel engines, which is included in the mandatory installation list by more and more national/regional laws and regulations, such as CHINA VI, Euro VI, and EPA Tier3. Due to the limited capacity of DPF to contain PM, the manufacturer introduced a method of treating deposited PM by oxidation, which is called regeneration. This paper comprehensively summarizes the most advanced regeneration technology, including filter structure, new catalyst formula, accurate soot prediction, safe and reliable regeneration strategy, uncontrolled regeneration and its control methods. In addition, due to the change of working conditions in the regeneration process, the additional emissions during regeneration are discussed in this paper. The DPF is not only the aftertreatment device but also can be combined with diesel oxidation catalyst (DOC), selective catalytic reduction (SCR) and exhaust recirculation (EGR). In addition, the impact of DPF modification on the original system of some old models has been reasonably discussed in order to achieve emission targets.

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Section: Diesel Particulate Filter Regenerationmentioning

confidence: 99%

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

Zhang

Dong

Lan

et al. 2023

Environ Sci Pollut Res

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“…The catalyzed diesel particulate filter (CDPF) manufactured by coating noble metal catalyst such as Pt and Pd et al on the wall of DPF is being widely employed as an efficient diesel emission control technology 7 . It can not only oxidize CO, HC and increase the NO 2 proportion by oxidizing NO 8 , but also filter the particles with a high efficiency 9 , and achieve a regeneration of the CDPF by oxidizing the trapped particles with a relatively low temperature 10 . The Pt and Pd have strong catalytic activity in oxidizing CO, HC and NO.…”

Section: Introductionmentioning

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

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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.

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“…In order to overcome this problem, the active–passive component regeneration of the DOC-assisting DPF is a traditional option . A certain amount of the fuel is injected into the cylinder in the late stage of the combustion process, or a certain amount of the fuel is injected into the exhaust pipe at the upstream of a DOC. − The DOC is used to oxidize the fuel, heat the downstream DPF, and promote the passive regeneration of the DPF. In-cylinder injection of the fuel has an advantage that no additional fuel injection device is needed, whereas a main disadvantage is that the lubricating oil of the diesel engine will be diluted by the fuel.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on a Diesel Particulate Filter with Reciprocating Flow

et al. 2019

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In this article, a new diesel particulate filter (DPF) system with reciprocating flow is proposed, and an experimental study on the characteristics of the active–passive component regeneration of the DPF system is carried out. Several control parameters such as temperature distribution, pressure difference, and pollution emissions of the DPF system are measured for different reciprocating cycles. The mechanism of reciprocating flow regeneration of the DPF system and the effects of the reciprocating flow cycle on the performance of the DPF system are analyzed. Results show that (1) the DPF system can use a tiny amount of extra fuel to maintain the chemical reaction, which in turn realizes the regeneration of the catalyzed DPF because of its properties of heat recovery and reverse blowing of ash; (2) with the increase in the reciprocating flow cycle, the temperature profile moves toward the downstream side of the DPF system and the fluctuation amplitudes of the components of CO, NO, and NO2 increase; (3) if reasonable temperature distribution is formed in the DPF system for a certain reciprocating cycle, the regeneration efficiency can be obviously improved and the average content of particulate matter emission can be kept at quite a low level.

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Emission reduction characteristics of a catalyzed continuously regenerating trap after-treatment system and its durability performance

Abstract: This is a repository copy of Emission reduction characteristics of a catalyzed continuously regenerating trap after-treatment system and its durability performance.

Cited by 21 publications

References 31 publications

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

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

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

Experimental Study on a Diesel Particulate Filter with Reciprocating Flow

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