Numerical Analysis on Enhancing Spray Performance of SCR Mixer Device and Heat Transfer Performance Based on Field Synergy Principle

Ye, Jiedong; Lv, Junshuai; Tan, Dongli; Ai, Zhiqiang; Feng, Zhiqiang

doi:10.3390/pr9050786

Cited by 10 publications

(6 citation statements)

References 46 publications

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“…An effective way to enable more complete UWS decomposition is the application of static mixers [14], which also enhance spatial mixing of UWS droplets and their byproducts with exhaust gas. The most common forms of static mixers are blade-based and baffle mixers aimed at vortex generation [50]. The advantage of blade mixers is their simplicity and the possibility of the use of the blades as impingement plates for droplets [47].…”

Section: Introductionmentioning

confidence: 99%

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Numerical evaluation of urea-mixing devices for close-coupled selective catalytic reduction systems

Kaźmierski¹,

Kapusta²

2023

Combustion Engines

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The following research presents a numerical evaluation of existing and conceptual urea-mixing devices used in close-coupled (to the engine) selective catalytic reduction (SCR) systems. The analysis was aimed at the assessment of urea-mixing devices that could considerably enhance the reduction of nitrogen oxides from the diesel-engine combustion process under a wide range of operating conditions, including cold starts. The analysis showed that replacing blade-equipped static mixers with perforated stationary mixing devices may provide a more uniform spatial distribution of ammonia at the inlet to the SCR catalyst and reduce pressure drops generated by mixing devices. Moreover, the conceptual mixing devices, based on combinations of the blade and perforated mixers to develop intensive turbulence, enabled the increase of the mixing length leading to effective decomposition of the urea-water solution (UWS), and provided uniform spatial distribution of ammonia, even for the small-sized mixing systems. However, the intensive mixing was often associated with a significant rise in the pressure drop.

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Section: Introductionmentioning

confidence: 99%

“…This shorter distance additionally enabled a slight reduction in the pressure drop. Ye et al [50] analysed the influence of the mixer type, the number of mixers and the injector's position in the SCR system. Two types of mixers were considereda conventional blade mixer and a conventional baffle mixer.…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of urea-mixing devices for close-coupled selective catalytic reduction systems

Kaźmierski¹,

Kapusta²

2023

Combustion Engines

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“…There have been many reports about enhancing the uniformity of NH 3 distribution improve NO reduction. One way is to improve the uniformity of the flow field by setting up deflectors, rectifier grids, and other structures [10][11][12][13][14][15]. Another way is to enhance uniformity at the SCR catalytic zone entrance by changing the operating parameters (i.e., atomization angle, injection position, injection method, and injection velocity) [16,17].…”

Section: Introductionmentioning

confidence: 99%

Coupling selective catalytic reduction process inside a coke oven regenerator: The influence of mixing parameters on NO reduction

et al. 2022

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Many coking plants have adopted the process of preheating flue gas to apply medium and low-temperature SCR denitrification technology, which increases the NOx treatment cost, fuel consumption, and generates secondary pollutants. Based on the unique temperature distribution characteristics of the coke oven regenerator, this work proposes a method for synergizing SCR inside the regenerator to remove NOx. A three-dimensional numerical model of the synergy between heat storage and SCR reaction was constructed to study the influence of mixing parameters (atomization angle, injection velocity, nozzles number) on the NO reduction and NH3 distribution. The validity of the model was verified. The results showed that the uneven distribution of NH3 near the catalytic layer and the small SCR coating area limited the NO reduction efficiency. Increasing the number of nozzles was more beneficial than the injection velocity and atomization angle for improving the NH3 distribution uniformity and NO reduction efficiency, achieving a maximum NO reduction efficiency of 37.1% (reduced to 251.6 mg/m3). Further research found that the NO reduction capacity of the cooperative SCR model cannot exceed 36% without changing the thermal storage brick structure. When the inlet NO concentration is less than 235 mg/m3, the reaction model ensures that the outlet NO concentration meets the national emission standards.

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“…The emission characteristics of CO, NO x , CO 2 , and O 2 of selective catalytic reduction catalyst and diesel oxidation catalyst were studied. Ye et al [25] used CFD software to study the 3D simulation model and studied the effects of two typical injection methods and three distribution strategies, the heat transfer of different mixer flow fields was analyzed using the field synergy principle. The AVL-Fire coupled CHEMKIN (AVL List GmbH, CHEMKIN 4.0, Sandia Laboratory, USA) program was used to develop the corresponding diesel engine simulation model and adopted the improved chemical kinetics mechanism, including 34 reactions and 19 kinds to simulate the fuel injection process and combustion process [7].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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.

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Numerical Analysis on Enhancing Spray Performance of SCR Mixer Device and Heat Transfer Performance Based on Field Synergy Principle

Cited by 10 publications

References 46 publications

Numerical evaluation of urea-mixing devices for close-coupled selective catalytic reduction systems

Numerical evaluation of urea-mixing devices for close-coupled selective catalytic reduction systems

Coupling selective catalytic reduction process inside a coke oven regenerator: The influence of mixing parameters on NO reduction

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

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