Numerical Analysis of Urea Decomposition with Static Mixers in Marine SCR System

Choi, Cheolyong; Sung, Youl-Moon; Choi, Gyung‐Min; Kim, Duck Jool

doi:10.7763/jocet.2015.v3.165

Cited by 17 publications

(6 citation statements)

References 6 publications

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“…The weightage average value of NO x exhaust emission was calculated by ISO 8178 marine Diesel engine test cycle E3 as shown in Table 4 [30]. The overall weighted NO x exhaust emission level in g/kWh can be calculated using Equation (16) [47].…”

Section: Working Performance Of Lsm-based Scr Systemmentioning

confidence: 99%

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Numerical Investigation of SCR Mixer Design Optimization for Improved Performance

et al. 2019

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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.

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Section: Working Performance Of Lsm-based Scr Systemmentioning

confidence: 99%

“…It has been proved that NO x is mainly 90% composition of NO at the exhaust of the marine Diesel engine. The key reactions involved in SCR system are described as follows [14][15][16][17]. A static mixer is commonly adopted to generate uniform distribution of ammonia at the inlet of SCR catalyst [18].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of SCR Mixer Design Optimization for Improved Performance

et al. 2019

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“…Therefore, it is necessary to control the above factors to improve the NOx conversion and to reduce the ammonia slip. In general, there is trade off relationship in between NOx reduction and ammonia slip [17].…”

Section: Challenges Related To Scr Systemmentioning

confidence: 99%

Review on SCR catalysts by focusing impacts of sulfur on SCR performance

Mehdi

2019

SJET

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Marine diesel engines are extensively used for transportation and as well as for power generation purpose because of its higher durability, thermal and fuel efficiency than the gasoline engines. But the marine diesel engine produced severe NOx emissions that are currently well discussed issue needed to be solved due to its serious health and environmental problems. At the same time, because of increasing stringent regulations of NOx emissions it is necessary for ships to meet the international maritime organization (IMO) Tier III regulations in NOx emission control areas (ECA). It is enforced for the vessels that are constructed on and after the 1st January 2016. Therefore, a demand for well-functioning NOx reduction technology is required. Currently SCR is the most dominant and mature technology used to reduce the NOx with ammonia over the SCR catalyst. SCR catalyst is the core part of SCR system; hence this review described the different types of catalysts and their behavior under different conditions. Furthermore, the deactivation of SCR catalyst occurs by different mechanisms; however, the most significant mechanism is sulfur poisoning. Reaction temperature and availability of ammonia is also significant parameter for sulfur poisoning. Therefore, it is necessary to investigate how sulfur behaves with SCR catalysts. Even though many studies have been performed on Sulphur poisoning of catalysts but still requires complete understanding. This review covers the sulfur poisoning of vanadium and Cu-zeolites based SCR catalysts with mainly focus on Cu-zeolites because of its sulfur sensitivity.

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“…The source term is composed of an inertial loss term and a viscous loss term. 15 The flow of a viscous heat-conducting fluid is governed by momentum equations, also called the Navier-Stokes equations, supplemented by continuity and energy equations. The term Navier-Stokes equations is applied for the entire set of governing equations, that is, momentum, continuity, and energy.…”

Section: Numerical Approachmentioning

confidence: 99%

Performance evaluation of a urea-selective catalytic reduction system in a marine diesel engine

Lee

2016

Proceedings of the Institution of Mechanical Engineers, Part M:

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A numerical simulation of the droplet distribution at the exhaust duct for a static mixer and injection location was performed for marine selective catalyst reduction. Through experiments with this auxiliary marine urea-selective catalyst reduction system, the ammonia slip, selective catalyst reduction system pressure drop, and NO x reduction rate in accordance with the space velocity (i.e. engine load) were investigated. Under incremental and random experimental conditions, the ammonia slip of this urea-selective catalyst reduction system is below 3 ppm, which satisfies International Maritime Organization Tier III regulations.

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Numerical Analysis of Urea Decomposition with Static Mixers in Marine SCR System

Cited by 17 publications

References 6 publications

Numerical Investigation of SCR Mixer Design Optimization for Improved Performance

Numerical Investigation of SCR Mixer Design Optimization for Improved Performance

Review on SCR catalysts by focusing impacts of sulfur on SCR performance

Performance evaluation of a urea-selective catalytic reduction system in a marine diesel engine

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