Optimization of a Urea SCR System for On-Highway Truck Applications

Salanta, Gabriel; Zheng, Guanyu; Kotrba, Adam; Rampazzo, Rafael; Bergantim, Leonardo Coelho

doi:10.4271/2010-01-1938

Cited by 17 publications

(10 citation statements)

References 3 publications

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“…The urea‐SCR system for automotive diesel engines applications has been studied for over one decade, however, less research has been conducted on urea mixing systems. In previous research, several kinds of urea mixing modules, including the swirl mixing module, and the bulk motion mixing module were developed, which demonstrated that swirling gas flow is an effective way to promote the mixing, evaporation, and decomposition of UWS . Rajadurai analyzed a crimped wire mesh mixing module by a computational fluid dynamics (CFD) simulation and experiment, and the NO X conversion efficiency was improved by 10–30 %, with good urea uniformity.…”

Section: Introductionmentioning

confidence: 99%

“…However, in the previous studies, the experimental evaluation of the urea injection and mixing module only focused on several performance indicators . It seems more reasonable to evaluate the performance of the urea injection and mixing module by comprehensive experiments.…”

Section: Introductionmentioning

confidence: 99%

“…In previous research, several kinds of urea mixing modules, including the swirl mixing module, [25] and the bulk motion mixing module [26] were developed, which demonstrated that swirling gas flow is an effective way to promote the mixing, evaporation, and decomposition of UWS. [27] Rajadurai [28] analyzed a crimped wire mesh mixing module by a computational fluid dynamics (CFD) simulation and experiment, and the NO X conversion efficiency was improved by 10-30 %, with good urea uniformity. Way et al [26] designed an optimal bulk motion-mixing module that provides the best performance with a low pressure loss, a high uniformity index for both reluctant and exhaust, and complete urea-water vaporization in a short distance.…”

Section: Introductionmentioning

confidence: 99%

“…However, in the previous studies, the experimental evaluation of the urea injection and mixing module only focused on several performance indicators. [25][26][27][28][29][30] It seems more reasonable to evaluate the performance of the urea injection and mixing module by comprehensive experiments. Based on the above considerations, in this paper, a series of urea injection and mixing modules for the urea-SCR system were investigated by comprehensive experiments, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation on the urea injection and mixing module for improving the performance of urea‐SCR in diesel engines

Liu

2017

Can J Chem Eng

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In a urea selective catalytic reduction (urea‐SCR) system for diesel engines, the atomization, evaporation, and mixing conditions of urea water solution (UWS) play a crucial role for NOX conversion and ammonia slip in the SCR process. In this paper, a series of novel mixing modules were proposed to improve UWS evaporation, mixing, and distribution for NOX reduction in the SCR system. Experimental investigations were conducted on the performances of the existing and developed mixing modules under various engine test conditions, including particle size test, NOX conversion efficiency, flow bench tests, etc. To determine ammonia slip, the urea and ammonia distribution patterns were constructed and the non‐uniformity index was then calculated. Compared with the baseline (without mixing module) and existing mixing module, the NOX conversion efficiency of the SCR system with a developed mixing module is improved by 37.7 and 14.1 % at maximum, respectively. Furthermore, ammonia slip and distribution are ameliorated significantly with low‐pressure drops simultaneously. Among the mixing modules, Concept 3 design exhibits superior performance under the engine test conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental investigation on the urea injection and mixing module for improving the performance of urea‐SCR in diesel engines

Liu

2017

Can J Chem Eng

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“…42 Urea is now the primary means of NOx abatement in > 2.0 litre diesel engines where it is employed as a selective catalytic reductant. 43 Usually this involves an aqueous solution of the eutectic mixture at 11°C and 32.5wt%. 25 The values quoted for urea product growth are inclusive of non-fertilizer product applications.…”

Section: Production Status and Trendsmentioning

confidence: 99%

Urea as a hydrogen carrier: a perspective on its potential for safe, sustainable and long-term energy supply

Rollinson

Jones

Dupont

et al. 2011

Energy Environ. Sci.

253

169

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Recently, there have been publications reporting the use of urea, as a source of hydrogen/fuel cell power. There have however been no reports that singularly assess the suitability of urea for this purpose. This article provides not only a perspective on the attributes of urea ((NH 2 ) 2 CO) as a hydrogen carrier for fuel cells but also presents the findings of a review on the feasibility of utilising the enormous natural resource of urea that exists. Urea is a cheap and widely available commodity with well developed manufacturing infrastructure and a rapidly increasing volume of production. This offers rapid implementation of urea for application as a hydrogen carrie r either directly or as a source of ammonia. Compared with other industrial chemicals previously considered, urea has the advantages of being non-toxic, stable, and therefore easy to transport and store. This report reveals that the natural resource of urea could be a solution to long-term future sustainable hydrogen supply and that the present status of scientific knowledge necessary to extract this natural resource is in the most part understood. It is considered realistic that these sustainable routes could be exploited if they are given sufficient focus of research attention.

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