Accelerating Accurate Urea/SCR Film Temperature Simulations to Time-Scales Needed for Urea Deposit Predictions

Maciejewski, Daniel; Sukheswalla, Parvez; Wang, Chu; Drennan, Scott A.; Chai, Xiaochuan

doi:10.4271/2019-01-0982

Cited by 8 publications

(8 citation statements)

References 16 publications

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“…In this simulation, the coefficient C Wruck was set to 0.153, which is consistent with the research . However, in the simulation process, it was found that the heat transfer of Sim1 was underestimated.…”

Section: Resultsmentioning

confidence: 99%

“…In this simulation, the coefficient C Wruck was set to 0.153, which is consistent with the research. 39 However, in the simulation process, it was found that the heat transfer of Sim1 was underestimated. Maciejewski et al 39 stated that the heat transfer was generally overestimated by the analytical model by Wruck and Renz, 40 which is attributed to different liquid properties.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…For pure water, T * is 1.1, but for the aqueous urea solution, the value of T * will increase linearly. Here, T * is set as 1.53, which renders the critical temperature of droplet evaporation to be 373 K, and the upper limit of wall temperature for the liquid film deposited is 571 K. Wruck and Renz established a heat transfer model through the experiment of isopropanol droplets impacting on the NiCr surface. The heat transfer between the droplet and the wall is defined by eq . where A cont is the contact wall, t dc is the direct contact time, T w is the wall temperature, T d is the droplet temperature, and b w and b d are the thermal effusivities of the wall and the droplet, respectively.…”

Section: Model and Computational Domainmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Operating Conditions on Urea Deposit Formation in the Urea-SCR System on a Diesel Engine Exhaust-like Test Bench

Liu

Yan

Zheng

et al. 2021

Ind. Eng. Chem. Res.

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A rapid urea and byproduct deposit experimental platform was built and an integrated after-treatment device model of the nonroad agricultural diesel engine was established based on CONVERGE software. The effects of exhaust temperature, exhaust flow rate, and urea injection mass on urea and byproduct deposits were studied by both experiments and simulation. The model was validated using the back pressures of catalysts, mixer wall temperature, and distribution of urea and byproduct deposits. The performance of the mixer was evaluated using the concentration, mass, and uniformity of NH 3 at the front-end cross-section of its selective catalytic reduction catalyst. Wall temperature is the key influence factor on the composition of the liquid film and is affected by the urea injection mass and exhaust flow rate. When the wall temperature is low, the liquid film is mainly composed of urea solids, but when it is above 423 K, urea solids begin to decompose into biuret, cyanuric acid, ammelide, and other byproducts. As for mixer performance, the uniformities of NH 3 , temperature, and velocity are above 0.9, 0.975, and 0.965, respectively, under all working conditions.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Model and Computational Domainmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Operating Conditions on Urea Deposit Formation in the Urea-SCR System on a Diesel Engine Exhaust-like Test Bench

Liu

Yan

Zheng

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Research 25 was carried out using an analytical model for the heat transferred which was developed by Wruck and Renz 26 who calibrate with their own experiments of isopropanol drops impinging on a NiCr surface, given as where A cont is the contact wall, t dc is the direct contact time, T w is the wall temperature, T d is the droplet temperature, and b w and b d are the thermal effusivities of the droplet and the wall, respectively.…”

Section: Model and Mathematical Modelmentioning

confidence: 99%

“…Research 25 indicates that Wruck and Renz experiments 26 use isopropanol for calibration, whereas the liquid of current interest is UWS. The different liquid properties may explain why a new factor ( C Wruck ) was needed, and the C Wruck was set to 1.7 for this CFD model to match experimental data.…”

Section: Model and Mathematical Modelmentioning

confidence: 99%

Simulation Study on Prediction of Urea Crystallization of a Diesel Engine Integrated after-Treatment Device

Wang

Liu

Bao³

et al. 2021

ACS Omega

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An integrated after-treatment device model was established for our target engine based on the fluid simulation software (Converge), and simulation was performed to determine the NH 3 , temperature, and velocity uniformity at the front-end cross section of its SCR catalyst, urea deposition rate, liquid film mass of the mixer, and its positions under a low-load condition. Moreover, the structure of the mixer and injection pressure were optimized to improve the uniformity and reduce the liquid film mass. Our simulation results show the following facts: the liquid film is easily accumulated under a low-load condition and the structure of the mixer and the injection pressure significantly affect the urea deposition rate and uniformities and accumulation masses of the liquid film. As a result, our final optimization results indicate that the mass of the NH 3 and the NH 3 uniformity at the front-end cross section of the SCR catalyst increase by 2.83 times and 5.65%. The urea deposition rate and the cumulative mass of the liquid film fall by 4.82 and 10.4%, respectively. This study has certain theoretical guiding significance for the optimal design of this type of after-treatment devices.

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Computational Studies of Urea-Derived Deposits in a Close-Coupled SCRF System

Mao

2023

Lecture Notes in Electrical Engineering

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Accelerating Accurate Urea/SCR Film Temperature Simulations to Time-Scales Needed for Urea Deposit Predictions

Cited by 8 publications

References 16 publications

Influence of Operating Conditions on Urea Deposit Formation in the Urea-SCR System on a Diesel Engine Exhaust-like Test Bench

Influence of Operating Conditions on Urea Deposit Formation in the Urea-SCR System on a Diesel Engine Exhaust-like Test Bench

Simulation Study on Prediction of Urea Crystallization of a Diesel Engine Integrated after-Treatment Device

Computational Studies of Urea-Derived Deposits in a Close-Coupled SCRF System

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