Numerical Simulation of NOx Reduction in a SCR System

Blinov, Artem; Kiselev, N. A.; Myagkov, L. L.

doi:10.1088/1757-899x/1111/1/012009

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…Systems for converting nitrogen oxide (NOx) in exhaust gases into safe N2 are called selective catalytic reduction aftertreatment systems. Numerical modeling is used throughout the design phase of SCR (selective catalytic reduction) systems to speed up the process and cut expenses [23]. YJ Kim et al (2019) investigated the computational fluid dynamics study on the uniformity and characteristics of exhaust gas in the diesel particulate filter/diesel oxidation catalyst of a ship diesel reduction system.…”

Section: Proceedings Of the 8 Th International Exchange And Innovatio...mentioning

confidence: 99%

Catalytic Converter Simulation for Pressure and Velocity Measurement

Sufian¹,

Afzal²,

Javaid³

et al. 2022

Proceedings of International Exchange and Innovation Conference on Engineering &Amp; Sciences (IEICES)

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Chemicals produced by automobiles, such as low-level ozone and photochemical smog, were a major contributor to the pollution. Nitrogen oxides, carbonized hydrocarbons, and carbon monoxide are some of these hazardous gases that are harmful to both the environment and people. By transforming hazardous smoke into less hazardous gases, a catalytic converter purges the air of harmful substances. Typically, automobiles use catalytic converters that are simulated in this present work using ANSYS (Fluent). It is noted that the catalytic converter depends on its length, density, output pressure, and inlet velocity. Comparing the results to models of other catalytic converters, three planes, each with two oxidation and reduction blocks, produce better outcomes. This catalytic converter simulation transforms three toxic gases into less hazardous gases and works efficiently, in contrast to conventional catalytic converter models that only transform two dangerous gases.

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Section: Proceedings Of the 8 Th International Exchange And Innovatio...mentioning

confidence: 99%

Catalytic Converter Simulation for Pressure and Velocity Measurement

Sufian¹,

Afzal²,

Javaid³

et al. 2022

Proceedings of International Exchange and Innovation Conference on Engineering &Amp; Sciences (IEICES)

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CFD-based investigation of NO_x removal from industrial waste gas by selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) process using NH₃

Bose,

Ghanta,

Hens

2024

International Journal of Chemical Reactor Engineering

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The present study conducts a comparative analysis between selective catalytic reduction (SCR) using a Cu-zeolite catalyst and selective non-catalytic reduction (SNCR) for the removal of NO x from industrial waste gas. The primary objective of this investigation is to computationally explore the removal of NO x using NH3 at various reactor conditions, along with the study of different hydrodynamic aspects. The study revealed the impact of different porosity of the catalyst (in SCR) and the number of baffles (in SNCR) on the reaction and fluid flow profile. Distinct geometries were employed to model each process, incorporating a turbulent model and kinetic parameters with an eddy-dissipation model (EDM) for simulations. Analyzing the effect of the NH3/NO ratio on NO conversion efficiency is a crucial component of the study. With diminishing efficiency at higher ratios, the SCR process demonstrated nearly complete NO conversion at a certain NH3/NO ratio, and this value changes with the inlet gas temperature. In contrast, SNCR produced less favorable conversion rates than SCR, indicating that the amount of NH3 supply affects conversion efficiency. At the SCR system’s optimum NH3/NO ratio, SNCR achieved an 83 % conversion, and the conversion rate remained relatively constant as the ratio was increased. The results highlight the various possibilities for optimization of the reactor systems in terms of efficiency and economic feasibility.

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Nitrogen Oxides and Ammonia Removal Analysis Based on Three-Dimensional Ammonia-Diesel Dual Fuel Engine Coupled with One-Dimensional SCR Model

Sun

et al. 2023

Energies

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Ammonia, as an alternative fuel for internal combustion engines, can achieve nearly zero carbon emissions. Although the development of the pure ammonia engine is limited by its poor combustion characteristics, ammonia–hydrocarbon mixed combustion can effectively improve the combustion of ammonia fuel. With the increase in the ammonia fuel proportion in the fuel mixture, a large number of nitrogen oxides (NOX) and unburned ammonia may be discharged, which have a poor impact on the environment. In this study, the performance of selective catalytic reduction (SCR) aftertreatment technology in reducing NOX and ammonia emissions from ammonia–diesel dual-fuel engines was investigated using simulation. A good cross-dimensional model was established under the coupling effect, though the effect of a single-dimensional model could not be presented. The results show that when the exhaust gas in the engine cylinder is directly introduced into the SCR without additional reducing agents such as urea, unburned ammonia flowing into SCR model is in excess, and there will be only ammonia at the outlet; however, if the unburned ammonia fed into the SCR model is insufficient to reduce NO, the ammonia concentration at the outlet will be 0. NOX can be 100% effectively reduced to N2 under most engine conditions; thus, unburned ammonia in exhaust plays a role in reducing NOX emissions from ammonia–diesel dual-fuel engines. However, when the concentration of unburned ammonia in the exhaust gas of an ammonia–diesel dual-fuel engine is large, its ammonia emissions are still high even after the SCR. In addition, the concentrations of N2O after SCR do not decrease, but increase by 50.64 in some conditions, the main reason for which is that by the action of the SCR catalyst, NO2 is partially converted into N2O, resulting in an increase in its concentration at the SCR outlet. Adding excessive air or oxygen into the SCR aftertreatment model can not only significantly reduce the ammonia concentration at the outlet of the model without affecting the NOX conversion efficiency of SCR, but inhibit N2O production to some extent at the outlet, thus reducing the unburned ammonia and NOX emissions in the tail gas of ammonia–diesel dual-fuel engines at the same time without the urea injection. Therefore, this study can provide theoretical guidance for the design of ammonia and its mixed-fuel engine aftertreatment device, and provide technical support for reducing NOX emissions of ammonia and its mixed fuel engines.

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Numerical Simulation of NOx Reduction in a SCR System

Cited by 3 publications

References 17 publications

Catalytic Converter Simulation for Pressure and Velocity Measurement

Catalytic Converter Simulation for Pressure and Velocity Measurement

CFD-based investigation of NO_x removal from industrial waste gas by selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) process using NH₃

Nitrogen Oxides and Ammonia Removal Analysis Based on Three-Dimensional Ammonia-Diesel Dual Fuel Engine Coupled with One-Dimensional SCR Model

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Numerical Simulation of NOx Reduction in a SCR System

Cited by 3 publications

References 17 publications

Catalytic Converter Simulation for Pressure and Velocity Measurement

Catalytic Converter Simulation for Pressure and Velocity Measurement

CFD-based investigation of NO x removal from industrial waste gas by selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) process using NH3

Nitrogen Oxides and Ammonia Removal Analysis Based on Three-Dimensional Ammonia-Diesel Dual Fuel Engine Coupled with One-Dimensional SCR Model

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Product

Resources

About

CFD-based investigation of NO_x removal from industrial waste gas by selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) process using NH₃