Investigation of the impact of the configuration of exhaust after-treatment system for diesel engines

Lao, Chung Ting; Akroyd, Jethro; Eaves, Nick A.; Smith, Alastair G.; Morgan, Neal; Nurkowski, Daniel; Bhave, Amit; Kraft, Markus

doi:10.1016/j.apenergy.2020.114844

Cited by 49 publications

(25 citation statements)

References 66 publications

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“…One of the applied aspects in this area of research is the RICE exhaust system. New data on the gas dynamics and heat transfer of unstable processes in the exhaust system can be useful for refining valve strength calculation methods [16], improving the environmental performance of the engine [17], reducing exhaust noise [18], creating systems for the conversion of the thermal energy of exhaust gases [19,20] and updating the design of exhaust systems [21,22].…”

Section: Introductionmentioning

confidence: 99%

Thermal-mechanical characteristics of stationary and pulsating gas-flows in a gas-dynamic system: In relation the exhaust system of an engine

Plotnikov

2022

Therm sci

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It is a relevant objective in thermal physics and in building reciprocating internal combustion engines (RICE) to obtain new information about the thermal-mechanical characteristics of both stationary and pulsating gas flows in a complex gas-dynamic system. The article discusses the physical features of the gas dynamics and heat transfer of flows along the length of a gas-dynamic system typical for RICE exhaust systems. Both an experimental set-up and experimental techniques are described. An indirect method for determining the local heat transfer coefficient of gas flows in pipelines with a constant temperature hot-wire anemometer is proposed. The regularities of changes in the instantaneous values of the flow rate and the local heat transfer coefficient in time for stationary and pulsating gas flows in different elements of the gas-dynamic system are obtained. The regularities of the change in the turbulence number of stationary and pulsating gas flows along the length of RICE gas-dynamic systems are established (it is shown that the turbulence number for a pulsating gas flow is 1.3-2.1 times higher than for a stationary flow). The regularities of changes in the heat transfer coefficient along the length of the engine?s gas-dynamic system for stationary and pulsating gas flows were identified (it was established that the heat transfer coefficient for a stationary flow is 1.05-1.4 times higher than for a pulsating flow). Empirical equations are obtained to determine the turbulence number and heat transfer coefficient along the length of the gas-dynamic system.

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Section: Introductionmentioning

confidence: 99%

Thermal-mechanical characteristics of stationary and pulsating gas-flows in a gas-dynamic system: In relation the exhaust system of an engine

Plotnikov

2022

Therm sci

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“…Initially, much of the lean-burn automotive emissions reduction was handled through emissions-conscious engine design and the use of a diesel oxidation catalyst (DOC) [1][2][3][4][5][6][7]. However, modern lean-burn emissions control requires a complex approach involving a series of specialized materials [8][9][10][11][12][13][14] to manage the wide variety of pollutants and exhaust conditions due to the increasingly strict emissions standards. These include diesel particulate filters (DPF) and selective catalytic NOx reduction catalysts (SCR), in addition to the DOC.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Ion-Exchanged ZSM-5, BEA, and SSZ-13 Zeolite Trapping Materials under Realistic Exhaust Conditions

et al. 2021

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An industry-defined evaluation protocol was used to evaluate the hydrocarbon trapping (HCT) and passive NOx adsorption (PNA) potential for BEA, ZSM-5, and SSZ-13 zeolites with ion-exchanged Pd or Ag. All materials underwent 700 °C degreening prior to exposure to an industry-derived protocol gas stream, which included NOx, ethylene, toluene, and decane as measured trapping species as well as common exhaust gasses CO, H2O, O2, CO2, and H2. Evaluation showed that BEA and ZSM-5 zeolites were effective at trapping hydrocarbons (HCs), as saturation was not achieved after 30 min of exposure. SSZ-13 also stored HCs but was only able to adsorb 20–25% compared to BEA and ZSM-5. The presence of Ag or Pd did not impact the overall HC uptake, particularly in the first three minutes. Pd/zeolites had significantly lower THC release temperature, and it aided in the conversion of the released HCs; Ag only had a moderate effect in both areas. With respect to NOx adsorption, the level of uptake was much lower than HCs on all samples, and Ag or Pd was necessary with Pd being notably more effective. Additionally, only Pd/ZSM-5 and Pd/SSZ-13 continue to store a portion of the NOx above 200 °C, which is critical for downstream selective catalytic NOx reduction (SCR). Hydrothermal aging (800 °C for 50 h) of a subset of the samples were performed: BEA, Pd/BEA, ZSM-5, Pd/ZSM-5, and Pd/SSZ-13. There was a minimal effect on the HC storage, ~10% reduction in capacity with no effect on release temperature; however, only Pd/SSZ-13 showed significant NOx storage after aging.

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“…Therefore, the China VI emission standards have been promulgated and implemented to prevent environmental pollution caused by vehicle exhaust [2]. Facing these challenges, researchers in the automotive industry have been continuously working on reducing vehicle emission through innovative solutions in the areas of advanced engine combustion and exhaust after-treatment technologies [3,4]. The integrated application of basic emission reduction technologies, such as diesel oxidation catalyst (DOC), diesel particulate filter (DPF), selective catalytic reduction (SCR), and ammonia slip catalyst (ASC), can constitute effective emission reduction solutions.…”

Section: Introductionmentioning

confidence: 99%

Fault Detection of Diesel Engine Air and after-Treatment Systems with High-Dimensional Data: A Novel Fault-Relevant Feature Selection Method

Ran

Song

et al. 2021

Processes

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In order to reduce pollutants of the emission from diesel vehicles, complex after-treatment technologies have been proposed, which make the fault detection of diesel engines become increasingly difficult. Thus, this paper proposes a canonical correlation analysis detection method based on fault-relevant variables selected by an elitist genetic algorithm to realize high-dimensional data-driven faults detection of diesel engines. The method proposed establishes a fault detection model by the actual operation data to overcome the limitations of the traditional methods, merely based on benchmark. Moreover, the canonical correlation analysis is used to extract the strong correlation between variables, which constructs the residual vector to realize the fault detection of the diesel engine air and after-treatment system. In particular, the elitist genetic algorithm is used to optimize the fault-relevant variables to reduce detection redundancy, eliminate additional noise interference, and improve the detection rate of the specific fault. The experiments are carried out by implementing the practical state data of a diesel engine, which show the feasibility and efficiency of the proposed approach.

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Investigation of the impact of the configuration of exhaust after-treatment system for diesel engines

Cited by 49 publications

References 66 publications

Thermal-mechanical characteristics of stationary and pulsating gas-flows in a gas-dynamic system: In relation the exhaust system of an engine

Thermal-mechanical characteristics of stationary and pulsating gas-flows in a gas-dynamic system: In relation the exhaust system of an engine

Analysis of Ion-Exchanged ZSM-5, BEA, and SSZ-13 Zeolite Trapping Materials under Realistic Exhaust Conditions

Fault Detection of Diesel Engine Air and after-Treatment Systems with High-Dimensional Data: A Novel Fault-Relevant Feature Selection Method

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