Numerical simulation and experimental research on combustion characteristics of compression-ignition engine under an O<sub>2</sub>/CO<sub>2</sub> atmosphere

Chen, Hanyu; Shen, Hai; Wu, Tong; Cheng-ji, Zuo

doi:10.1080/1023697x.2017.1339574

Cited by 5 publications

(5 citation statements)

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“…The process parameters had to be accurately determined and accordingly water, oxygen and diesel fuel (or n-heptane) flow into the reactor had to be controlled for the maximum hydrogen yield. Referring to the above simulated optimization results and the realistic operating conditions of the prototype diesel engine [35], the flow rates of water, diesel fuel and n-heptane were calculated to be 8, 5.4 and 3.7 mL/min under the constant GHSV condition of 10,000 1/h during the reforming bench tests, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Numerical Simulation and Experimental Investigation of Diesel Fuel Reforming over a Pt/CeO2-Al2O3 Catalyst

et al. 2019

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In order to benefit from a realistic hydrogen production device equipped on a vehicle, issues with the effects of the process parameters on H2 and CO yield need to be resolved. In this study, a reduced mechanism for n-heptane (as a surrogate diesel) reforming over a Pt/CeO2-Al2O3 catalyst is adopted to investigate the effects of the process parameters on H2 and CO yield, and the preferred process parameters are concluded. In addition, the comparison of reforming bench tests of diesel fuel and n-heptane under typical diesel engine operating conditions is conducted. The n-heptane reforming simulation results show that the maximum H2 and CO yield moves toward unity with the decreased GHSV and increased reaction temperature, and the GHSV of 10,000 1/h, O2/C ratio of 0.6 and reaction temperature of 500 °C is preferable. The contrast experiments reveal that the change trend of H2 and CO yield displays consistence, although the difference of the average H2 and CO yield results is obvious. The characteristics of n-heptane reforming can represent H2 and CO yield features of diesel fuel reforming at typical reaction temperatures in a way.

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Section: Methodsmentioning

confidence: 99%

“…Referring to the prototype diesel engine operating conditions [35], the Gas Hourly Space Velocity (GHSV; volumetric flow rate of gas per hour divided by the volume of the catalyst bed) was set to 10,000, 15,000, 20,000 and 25,000 1/h. O 2 /C molar ratio was set to 0.6, 0.8, 1.0 and 1.2.…”

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Numerical Simulation and Experimental Investigation of Diesel Fuel Reforming over a Pt/CeO2-Al2O3 Catalyst

et al. 2019

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“…In Table 1, A is the pre-exponential factor, n is temperature index, and E is the activation energy. With regard to the prototype diesel engine operating conditions [49], the Gas Hourly Space Velocity (GHSV; volumetric flow rate of gas per hour divided by the volume of the catalyst bed) is set to 10,000, 15,000, 20,000, and 25,000 1/h. The O 2 /C molar ratio is set to 0.3, 0.4, 0.5, and 0.6.…”

Section: Catalytic Reforming Kinetics Of Representative Hydrocarbonsmentioning

confidence: 99%

Numerical Simulation and Experimental Study on Commercial Diesel Reforming Over an Advanced Pt/Rh Three-Way Catalyst

Chen¹,

Wu²,

Pan³

et al. 2019

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Hydrocarbon fuel reforming has been proven useful for producing hydrogen that is utilized on road vehicles, but it is associated with reaction mechanism and catalyst characterization. In this study, a reduced mechanism for n-heptane/toluene reforming over an advanced Pt/Rh TWC is adopted to investigate the effects of the reaction conditions on H2 and CO concentrations. The physical and chemical properties of the advanced catalyst are examined using SEM, XRD and XPS analyses. The contrasted experiments are conducted to study the composition variation tendency of the reforming reactor gas product. The results show that the POX reaction is most likely to occur considering the stoichiometric ratio of H2/CO, and other reactions are SR or ATR. The coke formation and carbon deposition occur on the catalyst surface, and the diffraction peaks corresponding to the metallic Pt are observed, while no obvious peaks characteristic of Rh are detected. The characteristics of the concentration trend of n-heptane/toluene reforming can represent H2 and CO yield features of diesel reforming in a way; nevertheless, the difference of the average H2 and CO concentration is remarkable.

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“…Hu and Wei [33] further investigated the CO 2 effects on the propane laminar flow flame speed by Bunsen burner experiment, and the results concluded that the CO 2 thermal effect is the determining factor, followed by the chemical effect and finally the radiation effect. Additionally, Chen et al [34] studied the diesel combustion process through optical engine experiments, and the results showed that the engine power loss was minimized and the IDT was shortened obviously in the 50% CO 2 /50% O 2 atmosphere. Peng et al [35] compared the autoignition delay of butane in CO 2 /O 2 and air atmosphere by HPST experiment and analyzed the equivalence ratio and CO 2 effect on the IDT.…”

Section: Introductionmentioning

confidence: 99%

Effects of High-Concentration CO2 on Ignition Delay Time of 70% n-Heptane/30% Toluene Mixtures

et al. 2022

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In order to research the high-concentration CO2 effects on ignition delay time (IDT) of diesel surrogate fuel (70% n-heptane/30% toluene), a carbon dioxide effect (CDE) model is established, which considers fuel and ambient gas concentration, density, and temperature influence on autoignition under CO2/O2 atmosphere. Firstly, a chemical model of n-heptane/toluene is established, and the coupling, reduction, and simulation processes are carried out in chemical kinetic software with the IDT as the target parameter. Secondly, a constant volume combustion chamber (CVCC) visualization platform is built by incorporating a high-speed camera system and different working conditions are set in the CO2 volume fraction range (40%-70%) at 3.0 MPa and 850 K for an autoignition experiment. Thirdly, experiment and simulation results are discussed in air, 60% CO2/40% O2, 50% CO2/50% O2, and 40% CO2/60% O2 atmospheres, including the IDT, CO2 effects, temperature sensitivity, and OH radical rate of production (ROP). The results show that the CDE model well predicts the 70% n-heptane/30% toluene IDT under the CO2/O2 atmosphere and the average error in 60% CO2/40% O2 atmosphere is 5.29%. Besides, when the CO2 volume fraction increases from 40% to 60%, the CO2 thermal effect plays a leading role in the IDT prolongation and the OH radical ROP peak of R4 (O+H2O⟶2OH) decreases by 180%.

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Numerical simulation and experimental research on combustion characteristics of compression-ignition engine under an O₂/CO₂ atmosphere

Cited by 5 publications

References 20 publications

Numerical Simulation and Experimental Investigation of Diesel Fuel Reforming over a Pt/CeO2-Al2O3 Catalyst

Numerical Simulation and Experimental Investigation of Diesel Fuel Reforming over a Pt/CeO2-Al2O3 Catalyst

Numerical Simulation and Experimental Study on Commercial Diesel Reforming Over an Advanced Pt/Rh Three-Way Catalyst

Effects of High-Concentration CO2 on Ignition Delay Time of 70% n-Heptane/30% Toluene Mixtures

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Numerical simulation and experimental research on combustion characteristics of compression-ignition engine under an O2/CO2 atmosphere

Cited by 5 publications

References 20 publications

Numerical Simulation and Experimental Investigation of Diesel Fuel Reforming over a Pt/CeO2-Al2O3 Catalyst

Numerical Simulation and Experimental Investigation of Diesel Fuel Reforming over a Pt/CeO2-Al2O3 Catalyst

Numerical Simulation and Experimental Study on Commercial Diesel Reforming Over an Advanced Pt/Rh Three-Way Catalyst

Effects of High-Concentration CO2 on Ignition Delay Time of 70% n-Heptane/30% Toluene Mixtures

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Numerical simulation and experimental research on combustion characteristics of compression-ignition engine under an O₂/CO₂ atmosphere