Performance Optimization of High-Pressure SCR System in a Marine Diesel Engine. Part I: Flow Optimization and Analysis

Zhu, Yuanqing; Zhang, Rongpei; Zhou, Song; Huang, Chunan; Shreka, Majed; Zhang, Chaolei

doi:10.1007/s11244-018-1124-x

Cited by 16 publications

(5 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Du et al [146] simulated the flue gas flow under different size and best deflector arrangement. Zhu et al [147] optimized the structure of HP-SCR system and evaluated its performance. Verschaeren and Verhelst [148] investigated the strategies of the higher exhaust temperature to allow stable SCR operation.…”

Section: Exhaust Aftertreatment 351 De-noxmentioning

confidence: 99%

A review on regulations, current status, effects and reduction strategies of emissions for marine diesel engines

Wang

2020

Fuel

235

View full text Add to dashboard Cite

Marine diesel engines, which provide main power source for ships, mainly contribute to air pollution in ports and coastal areas. Thus there is an increasing demand on tightening the emission standards for marine diesel engines, which necessitates the research on various emission reduction strategies. This review covers emission regulations and emission factors (EFs), environmental effects and available emission reduction solutions for marine diesel engines. Not only the establishment of the emission control areas (ECAs) in the regulations but also many experiments show high concerns about the sulfur limits in fuels, sulfur oxides (SOx) and nitrogen oxides (NOx) emissions. Research results reveal that NOx emissions from marine diesel engines account for 50% of total NOx in harbors and coastal regions. Sulfur content in fuel oil is an important parameter index that determines the development direction of emission control technologies. Despites some issues, biodiesel, methanol and liquefied nature gas (LNG) play their important roles in reducing

show abstract

Section: Exhaust Aftertreatment 351 De-noxmentioning

confidence: 99%

A review on regulations, current status, effects and reduction strategies of emissions for marine diesel engines

Wang

2020

Fuel

235

View full text Add to dashboard Cite

show abstract

“…It was therefore neglected in our study. Moreover, some studies also have neglected this effect due to the complexity of system [25,26].…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…However, use of a line mixer (LM) can result in increasing the mixing flow (exhaust gas plus urea droplets) in the blind corner near the pipe wall, while SM results in increasing the mixing flow in the center [25]. Some studies investigated LM with different blade angles [25,26], and others used SM with different blade angles [18,27]. In this study LM was used in front of SM.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of SCR Mixer Design Optimization for Improved Performance

et al. 2019

Self Cite

View full text Add to dashboard Cite

The continuous increase in the number of stringent exhaust emission legislations of marine Diesel engines had led to a decrease in NOx emissions at the required level. Selective catalyst reduction (SCR) is the most prominent and mature technology used to reduce NOx emissions. However, to obtain maximum NOx removal with minimum ammonia slip remains a challenge. Therefore, new mixers are designed in order to obtain the maximum SCR efficiency. This paper reports performance parameters such as uniformity of velocity, ammonia uniformity distribution, and temperature distribution. Also, a numerical model is developed to investigate the interaction of urea droplet with exhaust gas and its effects by using line (LM) and swirl (SM) type mixers alone and in combination (LSM). The urea droplet residence time and its interaction in straight pipe are also investigated. Model calculations proved the improvement in velocity uniformity, distribution of ammonia uniformity, and temperature distribution for LSM. Prominent enhancement in the evaporation rate was also achieved by using LSM, which may be due to the breaking of urea droplets into droplets of smaller diameter. Therefore, the SCR system accomplished higher urea conversion efficiency by using LSM. Lastly, the ISO 8178 standard engine test cycle E3 was used to verify the simulation results. It has been observed that the average weighted value of NOx emission obtained at SCR outlet using LSM was 2.44 g/kWh, which strongly meets International Maritime Organization (IMO) Tier III NOx (3.4 g/kWh) emission regulations.

show abstract

“…SCR is a technology that reduces NO x contained in the exhaust gas to N 2 and H 2 O and uses a reducing agent such as urea [10]. In order to apply the EGR and SCR for reducing NO x to the exhaust system of the CI engine, it should be installed with consideration of the interaction with the gas flow of the intake/exhaust systems [11].…”

Section: Introductionmentioning

confidence: 99%

1D–3D Coupling Algorithm of Gas Flow for the Valve System in a Compression Ignition Engine

Kong

2021

JMSE

View full text Add to dashboard Cite

Emission control devices such as selective catalytic reduction (SCR), exhaust gas recirculation (EGR), and scrubbers were installed in the compression ignition (CI) engine, and flow analysis of intake air and exhaust gas was required to predict the performance of the CI engine and emission control devices. In order to analyze such gas flow, it was inefficient to comprehensively analyze the engine’s cylinder and intake/exhaust systems because it takes a lot of computation time. Therefore, there is a need for a method that can quickly calculate the gas flow of the CI engine in order to shorten the development process of emission control devices. It can be efficient and quickly calculated if only the parts that require detailed observation among the intake/exhaust gas flow of the CI engine are analyzed in a 3D approach and the rest are analyzed in a 1D approach. In this study, an algorithm for gas flow analysis was developed by coupling 1D and 3D in the valve systems and comparing with experimental results for validation. Analyzing the intake/exhaust gas flow of the CI engine in a 3D approach took about 7 days for computation, but using the developed 1D–3D coupling algorithm, it could be computed within 30 min. Compared with the experimental results, the exhaust pipe pressure occurred an error within 1.80%, confirming the accuracy and it was possible to observe the detailed flow by showing the contour results for the part analyzed in the 3D zone. As a result, it was possible to accurately and quickly calculate the gas flow of the CI engine using the 1D–3D coupling algorithm applied to the valve system, and it was expected that it can be used to shorten the process for analyzing emission control devices, including predicting the performance of the CI engine.

show abstract

Performance Optimization of High-Pressure SCR System in a Marine Diesel Engine. Part I: Flow Optimization and Analysis

Cited by 16 publications

References 18 publications

A review on regulations, current status, effects and reduction strategies of emissions for marine diesel engines

A review on regulations, current status, effects and reduction strategies of emissions for marine diesel engines

Numerical Investigation of SCR Mixer Design Optimization for Improved Performance

1D–3D Coupling Algorithm of Gas Flow for the Valve System in a Compression Ignition Engine

Contact Info

Product

Resources

About