Critical interpretative review on current outlook and prospects of selective catalytic reduction system for De-NOx strategy in compression ignition engine

Vignesh, R.; Ashok, B.

doi:10.1016/j.fuel.2020.117996

Cited by 64 publications

(20 citation statements)

References 257 publications

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“…Taking into account that the urea injection cannot be measured on-line, the standard solution is to map the amount of urea injected with the injector actuation. While this approach may be accurate enough at the beginning of injector's life, it is well documented in literature 13 that urea deposits often appear in the injectors and the relation between injector actuation and urea flow may evolve with time as the engine ages. SCR models strictly rely in information concerning the SCR inlet and the SCR state, then without using the valuable information that a NO x at the SCR oulet can provide.…”

Section: Methodsmentioning

confidence: 99%

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Simultaneous NOx and NH3 slip prediction in a SCR catalyst under real driving conditions including potential urea injection failures

Plá

Piqueras

Bares

et al. 2021

International Journal of Engine Research

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To reach the emission limits imposed by governments and reduce the negative impact on the environment, the use of aftertreatment systems has become essential for internal combustion engine (ICE) based powertrains. In particular, the selective catalytic reduction (SCR) system is a widespread aftertreatment technology with high efficiency for [Formula: see text] abatement which shows complex dynamics and requires urea injection as reducing agent. Current urea injection strategies usually rely on the [Formula: see text] emissions feedback. This work presents a model for the on-line simultaneous prediction of [Formula: see text] and [Formula: see text] emissions after the SCR catalyst, allowing the emissions estimation even in conditions of urea injector failure, when it is not possible to rely on the injector feedback signal. The proposed model is based on state of the art on-board after-treatment instrumentation and proposes an extended Kalman filter (EKF) to combine a data-based model and the analysis of sensor signals to provide a reliable estimation of [Formula: see text] and [Formula: see text] slip. The proposed strategy is experimentally assessed in dynamic driving cycles, such as Worldwide harmonised Light vehicles Test Cycle (WLTC) and Standardised Random Test (RTS). The proposed method is evaluated in standard conditions (without failures) and with urea injection failures of 25% and 120% of the nominal injection amount. As a result, the prediction on [Formula: see text] and [Formula: see text] slip has been improved in all injection failure conditions, by an overall average of 47.8% and 61.8%, respectively, when compared to state-of-the-art control oriented models (physically based zero dimensional model or data-based).

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Section: Methodsmentioning

confidence: 99%

“…Then, the N O x reacts with the ammonia activated by the catalyst. 13 In theory, higher concentrations of urea into the catalyst lead to better N O x conversion. 14 However, not all ammonia is absorbed by the catalyst surface, the excess being released in the exhaust.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous NOx and NH3 slip prediction in a SCR catalyst under real driving conditions including potential urea injection failures

Plá

Piqueras

Bares

et al. 2021

International Journal of Engine Research

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show abstract

“…Turbocharger systems significantly increased NO x emission although the power losses caused by hydrogen applications were effectively compensated. Effective technologies could be used to decrease the NO x emissions, such as permanent/electromagnet-based fuel reforming system [40], exhaust gas recirculation [41], lean-burn [42], and selective catalytic reduction [43,44]. During hydrogen combustion, only thermal NO x was formed due to a lack of nitrogen and carbon elements in hydrogen [45].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation on the combustion and NOx emission characteristics of a turbocharged opposed rotary piston engine fuelled with hydrogen under wide open throttle conditions

Gao

Xing

Tian

et al. 2021

Fuel

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“…The mechanical properties, thermal stability, specific surface area, pore structure, pressure loss, and service life of the molded catalysts are the problems that need to be solved. 14 , 15 At present, most of the current low-temperature catalysts are supported catalysts, and most carriers such as molecular sieves and activated carbon have a large pore structure. Molecular sieve catalysts can only show activity at high temperatures, compared with other catalysts, they have good acid and corrosion resistance and are suitable for several specific nitrogen removal processes.…”

Section: Introductionmentioning

confidence: 99%

Study on Denitration Performance of Solid Waste Blast Furnace Slag Catalysts under Different Preparation Processes

et al. 2020

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In this article, blast furnace slag, a high-yield industrial solid waste, was taken as the research object and it was used as the main material. Bentonite was used as the binder, and water was added to shape the blast furnace slag into a small column. The denitration catalyst was prepared using different methods, its denitration performances were compared and analyzed, and the best preparation method and process parameters were screened. Results showed that bentonite will clearly improve denitration performance, and 4:1 blast furnace slag and bentonite was selected as the molding ratio to reduce the effect of bentonite on its performance, combined with the hardness and surface adhesion of the prepared carrier. Separately, the catalysts were prepared using citric acid impregnation, hydrothermal decomposition, and mixing method, and active Mn was loaded. Among them, the hydrothermal decomposition method cannot completely decompose in a closed kettle, resulting in a lower denitration performance. The catalyst prepared using the mixing method is superior to that prepared using the impregnation method because the active component prepared by the former was more uniformly dispersed, and simple and easy to operate, which can meet the needs of the excess denitration catalysts of small enterprises.

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Critical interpretative review on current outlook and prospects of selective catalytic reduction system for De-NOx strategy in compression ignition engine

Cited by 64 publications

References 257 publications

Simultaneous NOx and NH3 slip prediction in a SCR catalyst under real driving conditions including potential urea injection failures

Simultaneous NOx and NH3 slip prediction in a SCR catalyst under real driving conditions including potential urea injection failures

Numerical simulation on the combustion and NOx emission characteristics of a turbocharged opposed rotary piston engine fuelled with hydrogen under wide open throttle conditions

Study on Denitration Performance of Solid Waste Blast Furnace Slag Catalysts under Different Preparation Processes

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