Combined effect of inlet pressure, total cycle energy, and start of injection on low load reactivity controlled compression ignition combustion and emission characteristics in a multi-cylinder heavy-duty engine fueled with gasoline/diesel

Han, Weiqiang; Li, Bolun; Pan, Suozhu; Lu, Yao; Li, Xin

doi:10.1016/j.energy.2018.10.029

Cited by 24 publications

(14 citation statements)

References 58 publications

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“…Figure 5 shows the SEM diagram of no-aging mixtures applied in the thermogravimetric experiments. As shown in the figure, there is no obvious difference between the morphology of PU/Pt mixtures at 2 g/ft 3 and 10 g/ft 3 . The PU particles and Pt/Al 2 O 3 catalyst are relatively uniform in size and well-dispersed when the mass ratio is 1:1.…”

Section: Tg-dtg Curves and Sem Diagrams Of Different Experimentsmentioning

confidence: 83%

“…The commercial catalysts (mainly composed of Al 2 O 3 , platinum) are sourced from Texas Emission Control Technology (Wuxi) Co., Ltd., (Texas Emission Solutions (Wuxi), Wuxi, China), with different contents of platinum. The Pt contents are 2 g/ft 3 , 3.5 g/ft 3 , 5 g/ft 3 and 10 g/ft 3 , respectively. This kind of catalyst is sintered with slurry instead of being directly coated on the ceramic carrier.…”

Section: Materials and Samples Preparationmentioning

confidence: 97%

“…to the lower temperature area with the increase in Pt content, and the 10 g/ft 3 PU/Pt mix ture has the faster reaction rate. Figure 4b compares the TG-DTG curves at differen blending ratios.…”

Section: Tg-dtg Curves and Sem Diagrams Of Different Experimentsmentioning

confidence: 98%

“…The second stage varies from 500 to 800 • C, in which PU particles undergo a rapid oxidation and the TG curves come down noticeably. The oxidation rate of mixtures is promoted, and the curves shift to the lower temperature area with the increase in Pt content, and the 10 g/ft 3 PU/Pt mixture has the faster reaction rate. Figure 4b compares the TG-DTG curves at different blending ratios.…”

Section: Tg-dtg Curves and Sem Diagrams Of Different Experimentsmentioning

confidence: 99%

“…The government has formulated a series of extremely stringent emission standards to direct against the emission problem. This problem caused by diesel engines is harmful to human health and the environment [3,4]. A wall-flow diesel particulate filter (DPF) can dispose of those emission problems efficiently [5].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Different Thermal Aging Conditions on Soot Combustion with Catalyst by Thermogravimetric Analysis

et al. 2021

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Diesel particulates are deposited in the diesel particulate filter and removed by the regeneration process. The Printex-U (PU) particles are simulated as the diesel soot to investigate the influence of thermal aging conditions on soot combustion performance with the addition of catalysts. The comprehensive combustion index S, combustion stability index Rw and peak temperature Tp are obtained to evaluate the combustion performance. Compared with the PU/Pt mixtures of different Pt contents (2 g/ft3, 3.5 g/ft3, and 5 g/ft3), the 10 g/ft3 Pt contents improve soot combustion with the outstanding oxygen absorption ability. When the weight ratio of PU/Pt mixture is 1:1, the promoted effect achieves the maximum degree. The S and Rw increase to 8.90 × 10−8 %2min−2°C−3 and 39.11 × 105, respectively, compared with pure PU. After the thermal aging process, the PU/Pt mixture with a 350 °C aging temperature for 10 h promotes the soot combustion the best when compared to pure PU particles. It is not good as the PU/Pt mixture without aging, because the inner properties of soot and Pt/Al2O3 catalyst may have been changed. The S and Rw are 9.07 × 10−8 %2min−2°C−3 and 38.39 × 105, respectively, which are close to the no aging mixture. This work plays a crucial role in understanding the mechanism of the comprehensive effect of soot and catalyst on soot combustion after the thermal aging process.

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Section: Tg-dtg Curves and Sem Diagrams Of Different Experimentsmentioning

confidence: 83%

Section: Materials and Samples Preparationmentioning

confidence: 97%

Section: Tg-dtg Curves and Sem Diagrams Of Different Experimentsmentioning

confidence: 98%

Section: Tg-dtg Curves and Sem Diagrams Of Different Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Different Thermal Aging Conditions on Soot Combustion with Catalyst by Thermogravimetric Analysis

et al. 2021

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Suppression of thermoacoustic instability and NOx emissions of unsteady swirl premixed flame with upstream microjets

Zhou

2022

Asia-Pacific J Chem Eng

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Passive control methods are widely used in unsteady combustion systems due to their robustness and convenience. This paper used the upstream microjets method for the first time to control thermoacoustic instability and pollutant NOx emissions in unsteady swirl premixed flame. Three variables of CO 2 microjets flow rate, upstream microjets distance, and microjets number are investigated. Results demonstrate the upstream microjets distance plays a significant role in restraining the thermoacoustic instability and NOx emissions. The smaller the upstream microjets distance, the more completely the thermoacoustic instability is suppressed while the NOx emissions are the opposite, which means a compromise choice needs to be made between them. The damping ratio of pressure amplitude in the chamber can reach the maximum of 81.3%, and the damping ratio of CH* intensity can reach the maximum of 80.2%. Besides, the frequency of pressure and CH* will transit to a lower mode. NOx emissions can realize a maximum reduction of 12.2 ppm. Meanwhile, the flame mode switches from an enlarged Mode-A flame to a shrunk Mode-B flame, and the flame length shows a maximum reduction of 14 mm at the largest upstream distance. However, the specific control mechanism under upstream microjets still needs further study to clarify. This research proved the feasibility of suppressing combustion instability and NOx emissions with upstream microjets in unsteady swirl premixed flame, promoting its practical application in gas turbine systems.flame mode, NO x emissions, thermoacoustic instability, unsteady swirl premixed flame, upstream microjets | INTRODUCTIONAs a complex multidisciplinary problem, combustion instability was first proposed by scholar Rayleigh. 1 When combustion instability occurs, it is often accompanied by periodic large pressure oscillations. 2,3 The power engines in gas turbines, industrial furnaces, and rockets will face the threat of damage or even failure.To prevent the occurrence of combustion instability, researchers often implement control strategies from the two necessary factors of combustion instability, namely, acoustic oscillations and heat release oscillations. For

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State of the Art in Low-Temperature Combustion Technologies: HCCI, PCCI, and RCCI

Chauhan

Sayyed

Vedrtnam

et al. 2021

Energy, Environment, and Sustainability

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Combined effect of inlet pressure, total cycle energy, and start of injection on low load reactivity controlled compression ignition combustion and emission characteristics in a multi-cylinder heavy-duty engine fueled with gasoline/diesel

Cited by 24 publications

References 58 publications

Influence of Different Thermal Aging Conditions on Soot Combustion with Catalyst by Thermogravimetric Analysis

Influence of Different Thermal Aging Conditions on Soot Combustion with Catalyst by Thermogravimetric Analysis

Suppression of thermoacoustic instability and NOx emissions of unsteady swirl premixed flame with upstream microjets

State of the Art in Low-Temperature Combustion Technologies: HCCI, PCCI, and RCCI

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