Research on Influence of Exhaust Characteristics and Control Strategy to DOC-Assisted Active Regeneration of DPF

Liu, Guanlin; Liu, Weiqiang; He, Yong; Gong, Jinke; Li, Qiong

doi:10.3390/pr9081403

Cited by 12 publications

(8 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The exhaust temperature will be increased by the additional fuel combustion. There are two technical routes for the development of fuel injection location: The first technology is that the fuel is sprayed at the DOC inlet (Liu et al 2021a ). The additional fuel enhances the reaction in the DOC, which in turn increases the temperature at the DOC outlet.…”

Section: Diesel Particulate Filter Regenerationmentioning

confidence: 99%

“…As described in the “In-exhaust fuel injection + diesel oxidation catalyst” and “ Continuously regenerating trap ” sections, the DOC plays an important role in DPF thermal regeneration. In the process of DPF thermal regeneration, in order to maintain high-efficiency regeneration, the DOC outlet temperature is required to be stabilized at an appropriate temperature and maintained for a period of time (Liu et al 2021a ). The complex dynamic system composed of DOC and DPF faces many uncertainties in the changeable environment (such as catalyst aging, inaccurate fuel injection) (Huang et al 2021b ).…”

Section: Regeneration Management Of Diesel Particulate Filtermentioning

confidence: 99%

“…As shown in Fig. 25 , some representative devices are used with DPF, such as DOC, selective catalytic reduction (SCR), EGR, LNT etc., to form an aftertreatment system with DPF (Liu et al 2021a ) (Zhang et al 2022c ) (Kang et al 2018 ). Generally, engines equipped with DOC and DPF can reduce THC emissions by more than 70%, CO emissions by more than 97%, and PM emissions by more than 98% (Zhang et al 2022a ) (Zhang et al 2022f ).…”

Section: Interaction Between Regeneration and Other Aftertreatment Eq...mentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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.

show abstract

Section: Diesel Particulate Filter Regenerationmentioning

confidence: 99%

Section: Regeneration Management Of Diesel Particulate Filtermentioning

confidence: 99%

Section: Interaction Between Regeneration and Other Aftertreatment Eq...mentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…However, SPN emissions during regeneration events and immediately after are very high and can bring the weighted emissions close to the current limit. Thus, filtration efficiencies and regeneration strategies need to be carefully assessed for future regulation [72][73][74][75][76][77].…”

Section: Euro 7/viimentioning

confidence: 99%

Overview of Vehicle Exhaust Particle Number Regulations

et al. 2021

View full text Add to dashboard Cite

Vehicle emissions are a significant source of air pollution in cities. Particulate matter (PM) is a pollutant with adverse health effects. Regulations worldwide determine the PM exhaust emissions of vehicles by gravimetric quantification of the mass deposited on a filter over a test cycle. The introduction of particulate filters as vehicle exhaust gas aftertreatment devices led to low PM emissions. A particle number methodology (counting solid particles >23 nm), complementary to the PM mass measurement, was developed by the PMP (Particle Measurement Programme) group of the GRPE (Working Party on Pollution and Energy) of the UNECE (United Nations Economic Commission for Europe) during the first decade of the 21st century. The methodology was then introduced in the EU (European Union) regulations for light-duty (2011), heavy-duty (2013), and non-road mobile machinery (2019). In parallel, during the last 15 years, UN (United Nations) regulations and GTRs (Global Technical Regulations) including this methodology were also developed. To address the on-road emissions, the EU introduced RDE (real-driving emissions) testing with PEMS (portable emissions measurement systems) in 2017. Other countries (e.g., China, India) have also started adopting the number methodology. The PMP group recently improved the current laboratory and on-board methodologies and also extended them to a lower particle size (counting solid particles >10 nm). Due to the rapid evolution of the vehicle exhaust particle number regulations and the lack of a summary in the literature, this paper gives an overview of current and near future regulations. Emphasis is given on the technical specifications and the changes that have taken place over the years.

show abstract

“…The results showed that the catalytic performance of NO conversion is limited by the mass transfer in the DOC-catalyzed coating but is almost absent in the CDPF. Liu et al [27] developed a mathematical model that describes the thermal phenomena in diesel oxidation catalysts (DOC) and diesel particulate filters (DPF) during regeneration. The effects of carbon smoke load and oxygen concentration on the temperature performance of DPF regeneration were studied by Shi et al [28].…”

Section: Introductionmentioning

confidence: 99%

Soot Distribution Characteristics and Its Influence Factors in Burner-Type Regeneration Diesel Particulate Filter

et al. 2022

View full text Add to dashboard Cite

The burner-type regeneration diesel particulate filter is one of the most widely used diesel particulate filters. Using AVL FIRE, a 3D model of a burner-type regeneration diesel particulate filter (DPF) was established, and simulation analyses were carried out. The effects of the exhaust parameters (temperature, exhaust mass flow rate, and soot load) and the structural parameters (channel density, inlet/outlet channel ratio, and the length–diameter ratio) on soot distribution (soot mass concentration and soot thickness) were analyzed. The results show that the soot distribution characteristics of regenerative DPF with a burner are as follows: the soot mass concentration first rapidly rises to the maximum value and then rapidly decreases to a low value, and the dust thickness gradually increases with the increase in location. With the increase in exhaust mass flow rate and soot load, soot mass concentration and soot thickness increase. With the increase in temperature, the mass concentration and thickness of the ash decreased. When the temperature exceeds 750 K, soot begins to regenerate. Among the exhaust parameters, the mass flow rate of the exhaust has the greatest influence on the soot distribution. The length–diameter ratio, the ratio of the inlet and the outlet channel, and channel density have little effect on the mass concentration of soot, and the soot mass concentration increases with the increase in channel density. In addition to the length–diameter ratio of 2.1, the soot thickness increases with the increase in the length–diameter ratio, and the rising rate is also accelerated. The thickness of soot decreased with the increase in channel density and the ratio of the inlet and the outlet channels. When the channel density is more than 250, the change in soot thickness is basically the same. When the ratio of the inlet and the outlet channels exceeds 1.3, the change in the soot thickness is basically the same. Among the structural parameters, channel density has the greatest influence on the soot distribution.

show abstract

Research on Influence of Exhaust Characteristics and Control Strategy to DOC-Assisted Active Regeneration of DPF

Cited by 12 publications

References 46 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

Overview of Vehicle Exhaust Particle Number Regulations

Soot Distribution Characteristics and Its Influence Factors in Burner-Type Regeneration Diesel Particulate Filter

Contact Info

Product

Resources

About