Estimation of Ammonia Storage Nonuniformity for Urea-Based Selective Catalytic Reduction Systems

Lin, Qinghua; Chen, Pingen

doi:10.1115/1.4042143

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…9. Table 3 shows that the reaction rate is around 0.0030 mol/s at all space velocity, indicating that the main factors affecting the reaction rate is not space velocity, but temperature [15]. With the increase of space velocity, the cumulative reaction amount of NO x decreases slightly.…”

Section: Effect Of Space Velocity On Reaction Ratementioning

confidence: 93%

Influence of Urea Uneven Injection on the Performances of a Diesel Engine

Huang¹,

Bai²,

Li³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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The influence of heterogeneous flow injection of urea at different velocities and temperatures on NO x conversion efficiency, ammonia storage and ammonia leakage is investigated experimentally. A diesel engine employing a selective catalytic reduction (SCR) technology is considered. It is found that for a fixed injection velocity, the degree of ammonia leakage changes depending on the temperature. The higher the temperature, the faster the catalytic reduction reaction and the smaller the degree of ammonia leakage. The temperature has a great influence on the catalytic reduction reaction rate. At an injection velocity of 10000/h, the average reaction rate at 420 C is 12 times higher than that at 180 C. The injection velocity has a weak influence on the reaction rate. When the injection velocity changes from 10000/h to 40000/h at the same temperature, the average reaction rate does not change appreciably. However, increasing the space velocity can accelerate the leakage of ammonia, thereby mitigating the benefits associated with the NO x conversion.

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Section: Effect Of Space Velocity On Reaction Ratementioning

confidence: 93%

Influence of Urea Uneven Injection on the Performances of a Diesel Engine

Huang¹,

Bai²,

Li³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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“…Lin and Chen (2019) established a new SCR platform and con-ducted simulations with it to investigate the impact of ammonia storage nonuniformity on SCR performance. To estimate the ammonia storage coverage ratio uniformity, a novel diagnostic methodology was introduced and verified under the US06 cycle (Lin and Chen, 2019).…”

Section: Introductionmentioning

confidence: 99%

Simulation Study of Ammonia Storage Characteristics of Selective Catalytic Reduction for Diesel Engines

Tan

Huang

et al. 2021

Environmental Engineering Science

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Non-road machinery is very important, but non-road machinery has problems such as working under complex operating conditions. Agricultural machinery is an important type of non-road machinery, which mainly relies on diesel engines due to their high fuel efficiencies. The exhaust temperature of agricultural machinery changes drastically under different working conditions. This article aims to research on pollution control of non-road machinery. Among the exhaust after treatment technologies, selective catalytic reduction (SCR) technology is a very important method to reduce NO x. In this study, a series of tests was conducted to investigate the effects of temperature and exhaust gas mass flow on the NO x conversion and dynamic ammonia storage space distribution characteristics in simulation models. The genetic algorithm, a kind of global optimization algorithm that can avoid local optimization, was used in the parameter identification process. The simulation results showed that the ammonia storage capacity of SCR catalyst decreases as the temperature of SCR increases. With the decrease in temperature, the NH 3 desorption rate gradually decreased. An uneven distribution of ammonia storage similar to the shape of e was observed in the simulation and this kind of uneven distribution is obvious at low temperature. The effective area of the catalyst is near the inlet of the catalyst. This work presents an approach to help figure out the details in the ammonia storage process. This work provides information about the dynamic ammonia storage characteristics and guide for better SCR design.

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