Numerical Investigation of SCR Mixer Design Optimization for Improved Performance

Mehdi, Ghazanfar; Zhou, Song; Zhu, Yuanqing; Shah, Ahmer Hussain; Chand, Kishore

doi:10.3390/pr7030168

Cited by 28 publications

(23 citation statements)

References 40 publications

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“…There has been a steady decline in NO x emissions at an acceptable level due to the increasing number of rigorous exhaust legislations for marine diesel engines to minimize NOx emissions. Reduced NO x emission can also be achieved by selective catalyst reduction (SCR), which is the most widely used and established technology [3]. Although ship pollution rules of IMO (international maritime organization) strengthened like IMO Tier III, the demand for engine performance improvement is also increasing.…”

Section: Introductionmentioning

confidence: 99%

Tribology in Marine Diesel Engines

Hong¹

2022

Tribology of Machine Elements - Fundamentals and Applications

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This chapter deals with the tribology of marine diesel engines. Several types of diesel engines have been installed and used in the engine room of marine ships. Some of them, used for propulsion, operate at low-speed in a two-stroke combustion process in conjunction with propellers. Four-stroke engines are used for power generation and operates at medium-speed. In general, two or more four-stroke engines, including spares, are installed in the large ships. Tribological problems are important issue in the respect of reliability in the marine diesel engines, and there are many tribological engine components including bearings, pistons, fuel injection pumps and rollers. Moreover, the marine engines have lubricant problems such as lacquering. Improvements to the tribological performance of marine engine components, and lubricants can provide reduced oil and fuel consumption, improved durability, increased engines power outputs and maintenance. Therefore, this chapter shows better designs and methods in order to improve the tribological problem in the marine diesel engines.

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Section: Introductionmentioning

confidence: 99%

Tribology in Marine Diesel Engines

Hong¹

2022

Tribology of Machine Elements - Fundamentals and Applications

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“…Methods of reducing NOx include installing an exhaust gas recirculation (EGR), a selective catalytic reduction (SCR) [1], or using a dual-fuel engine [2]. In an SCR, the design of the mixer affects the performance, and Mehdi et al studied the optimal design to reduce NOx using a numerical investigation [3]. Zeng et al used CFD simulation to study the optimal design of a towertype SCR [4], and the method of analyzing the gas flow of the SCR using numerical analysis is being used with its accuracy verified.…”

Section: Introductionmentioning

confidence: 99%

A 1D–3D Approach for Fast Numerical Analysis of the Flow Characteristics of a Diesel Engine Exhaust Gas

Kong

2021

Machines

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It is necessary to analyze the intake/exhaust gas flow of a diesel engine when turbocharger matching and when installing emission control devices such as exhaust gas recirculation (EGR), selective catalytic reduction (SCR), and scrubbers. Analyzing the intake/exhaust gas flow using a 3D approach can use various analytical models, but it requires a significant amount of time to perform the computation. An approach that combines 1D and 3D is a fast numerical analysis method that can utilize the analysis models of the 3D approach and obtain accurate calculation results. In this study, the flow characteristics of the exhaust gas were analyzed using a 1D–3D coupling algorithm to analyze the unsteady gas flow of a diesel engine, and whether the 1D–3D approach was suitable for analyzing exhaust systems was evaluated. The accuracy of the numerical analysis results was verified by comparison with the experimental results, and the flow characteristics of various shapes of the exhaust system of a diesel engine could be analyzed. Numerical analysis using the 1D–3D approach was able to be computed about 300 times faster than the 3D approach, and it was a method that could be used for research focused on the exhaust system. In addition, since it could quickly and accurately calculate intake/exhaust gas flow, it was expected to be used as a numerical analysis method suitable for analyzing the interaction of diesel engines with emission control devices and turbochargers.

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“…With the rapid development of the modern economy, the problem of environmental pollution has become increasingly serious especially air pollution [1,2]. The harm caused by air pollution has caused widespread concern in countries and international organizations around the world.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation on the Optimization of Uneven Flow in a Marine De-SOx Scrubber

et al. 2020

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According to regulations from the International Maritime Organization (IMO), the sulfur content of vessels must not exceed 0.5% outside the Emission Control Areas (ECAs) starting from 2020. The marine exhaust gas desulfurization (De-SOx) system is the most feasible technology to meet the increasing regulations, but there is always a large swirl at the bottom of the scrubber causing uneven flow past the sprays. Solving this problem by adjusting the spray is a feasible method. The exhaust gas at 485 K and injection liquid at 305 K are simulated to optimize the flow field in a De-SOx scrubber. The results indicated that the flue gas was easily concentrated in the left side area of the scrubber and this part of hot gas could escape from the scrubber. By controlling the nozzles distribution and the nozzles angle, it was possible to reduce the droplets to hit the wall and improve the utilization rate of the washing liquid. The nozzles were arranged up and down in different positions, which reduced the escape amount of exhaust gas in the strong offset area. The new arrangement of nozzles made the flow field distribution inside the scrubber more uniform and increased the gas–liquid reaction time Although the pressure drop under outermost nozzles 45° injection was smaller than the vertical injection, the flow field under 45° injection became more complex and the outlet gas velocity became larger.

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Numerical Investigation of SCR Mixer Design Optimization for Improved Performance

Cited by 28 publications

References 40 publications

Tribology in Marine Diesel Engines

Tribology in Marine Diesel Engines

A 1D–3D Approach for Fast Numerical Analysis of the Flow Characteristics of a Diesel Engine Exhaust Gas

A Numerical Investigation on the Optimization of Uneven Flow in a Marine De-SOx Scrubber

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