Parameter estimation and analysis of an automotive heavy-duty SCR catalyst model

Åberg, Andreas; Widd, Anders; Abildskov, Jens; Huusom, Jakob Kjøbsted

doi:10.1016/j.ces.2016.12.024

Cited by 24 publications

(9 citation statements)

References 29 publications

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“…Moreover, the variance of NH 3 leakage increases with the reduction of the aging factor as well; that is, the aging of the catalyst will make the closed-loop control system unstable. As shown in Figure 5c,d, θ 1 is greater than θ 2 totally, that is, NH 3 is mainly stored at the first cell of catalyst. Meanwhile, with the aging of the catalyst, θ 1 decreases larger and faster, but, in contrast, the variation of θ 2 is not obvious relatively.…”

Section: Effect Of Aging On Scr Performancementioning

confidence: 95%

“…Therefore, the reduction of NO x emissions from diesel engine becomes one of the most important objectives for the after-treatment system. In order to solve this problem, a urea based selective catalytic reduction (Urea-SCR) is regarded as the most promising and efficient technique for NO x reduction [1][2][3][4], which can control the NO x emission through the SCR reaction between NH 3 (decomposed from urea) and NO x . Nevertheless, owing to the fact that NH 3 is also a kind of pollutant, the trade-off between NO x conversion efficiency and NH 3 leakage should be taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Diagnosis Accuracy of Hydrothermal Aging Degree of V2O5/WO3–TiO2 Catalyst in SCR Control System Using an GS–PSO–SVM Algorithm

Zeng

et al. 2017

Sustainability

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Selective catalytic reduction (SCR) is one of the most effective technologies used for eliminating NO x from diesel engines. This paper presents a novel method based on a support vector machine (SVM) and particle swarm optimization (PSO) with grid search (GS) to diagnose the degree of aging of the V 2 O 5 /WO 3 -TiO 2 catalyst in the SCR system. This study shows the aging effect on the performance of a NH 3 slip based closed-loop SCR control system under different aging factors (α), which are defined by the SCR reaction rate (R scr ). A diagnosis of the performance of GS-PSO-SVM has been presented as compared to SVM, GS-SVM and PSO-SVM to get reliable results. The results show that the average prediction diagnosis accuracy of the degree of catalytic aging is up to 93.8%, 93.1%, 92.9% and 92.0% for GS-PSO-SVM, PSO-SVM, GS-SVM and SVM respectively. It is demonstrated that GS-PSO-SVM is able to identify the SCR catalyst's degree of aging, to ultimately assist with fault tolerance in the aging of the SCR catalyst.

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Section: Effect Of Aging On Scr Performancementioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Improving the Diagnosis Accuracy of Hydrothermal Aging Degree of V2O5/WO3–TiO2 Catalyst in SCR Control System Using an GS–PSO–SVM Algorithm

Zeng

et al. 2017

Sustainability

View full text Add to dashboard Cite

show abstract

“…When NOx is reacted with water, nitric acid can be formed which is the major source of acid rain [6]. In order to reduce NOx from ships, many national governments and international organizations in the world have promulgated different regulations on shipping emissions, and also enforced strict requirements on NOx emission in the Emission Control Areas (ECA) [7]. In 2016, IMO Tier III standard on NOx emission proposed by International Maritime Organization (IMO) has already been enforced in North America Emission Control Area (ECA), including the East and West coast of the USA and Caribbean [8].…”

Section: Introductionmentioning

confidence: 99%

Review on SCR catalysts by focusing impacts of sulfur on SCR performance

Mehdi

2019

SJET

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Marine diesel engines are extensively used for transportation and as well as for power generation purpose because of its higher durability, thermal and fuel efficiency than the gasoline engines. But the marine diesel engine produced severe NOx emissions that are currently well discussed issue needed to be solved due to its serious health and environmental problems. At the same time, because of increasing stringent regulations of NOx emissions it is necessary for ships to meet the international maritime organization (IMO) Tier III regulations in NOx emission control areas (ECA). It is enforced for the vessels that are constructed on and after the 1st January 2016. Therefore, a demand for well-functioning NOx reduction technology is required. Currently SCR is the most dominant and mature technology used to reduce the NOx with ammonia over the SCR catalyst. SCR catalyst is the core part of SCR system; hence this review described the different types of catalysts and their behavior under different conditions. Furthermore, the deactivation of SCR catalyst occurs by different mechanisms; however, the most significant mechanism is sulfur poisoning. Reaction temperature and availability of ammonia is also significant parameter for sulfur poisoning. Therefore, it is necessary to investigate how sulfur behaves with SCR catalysts. Even though many studies have been performed on Sulphur poisoning of catalysts but still requires complete understanding. This review covers the sulfur poisoning of vanadium and Cu-zeolites based SCR catalysts with mainly focus on Cu-zeolites because of its sulfur sensitivity.

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“…Growing concerns about the environment have caused regulations concerning nitric oxides (NO x ) to become increasingly stringent [1]. For instance, the NO x emission limits of the European heavy-duty emission regulations have been reduced from 8.0 to 0.46 g/KWh [2].…”

Section: Introductionmentioning

confidence: 99%

Simulation of the flow field and the chemical reaction coupling of selective catalytic reduction (SCR) system using an orthogonal experiment

Zhang

2019

PLoS ONE

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It is difficult to simulate both the flow field and the chemical reaction using, respectively, the flow state and kinetics calculations and actually reflect the influence of the gas flow state on the chemical change in a selective catalytic reduction (SCR) system. In this study, the flow field and the chemical reaction were therefore coupled to simulate a full Cu-Zeolite SCR system and the boundary conditions of the simulation were set by a relevant diesel engine bench test which included the exhaust temperature, the mass flow, and the exhaust pressure. Then, the influence of the gas flow state on the NO x conversion efficiency was investigated. Specifically, an orthogonal experimental design was used to study the influence of the injection parameters (position, angle, and speed) on the NH 3 distribution by establishing the NH 3 uniformity coefficient γ at the SCR catalyst capture surface in the flow field simulation. Then, the velocity capture surface of the SCR catalyst front section was sliced into coupled data transfer interfaces to study the effects of exhaust temperature, ammonia to NO x ratio (ANR), and the NO 2 /NO x on the NO x conversion efficiency. This was used as guidelines to optimize the SCR system control strategy. The results showed that a 1150 mm injection position, a 45°injection angle, and a 23 m/s injection velocity provided the most uniform NH 3 distribution on the SCR catalyst capture surface. For constant injection parameters, the NO x conversion efficiency was the highest when the exhaust temperature was 200°C—400°C, the ANR was 1.1, and NO 2 /NO x was 0.5.

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Parameter estimation and analysis of an automotive heavy-duty SCR catalyst model

Cited by 24 publications

References 29 publications

Improving the Diagnosis Accuracy of Hydrothermal Aging Degree of V2O5/WO3–TiO2 Catalyst in SCR Control System Using an GS–PSO–SVM Algorithm

Improving the Diagnosis Accuracy of Hydrothermal Aging Degree of V2O5/WO3–TiO2 Catalyst in SCR Control System Using an GS–PSO–SVM Algorithm

Review on SCR catalysts by focusing impacts of sulfur on SCR performance

Simulation of the flow field and the chemical reaction coupling of selective catalytic reduction (SCR) system using an orthogonal experiment

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