Relevant bibliographies by topics / Kinetic of combustion

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Academic literature on the topic 'Kinetic of combustion'

Author: Grafiati
Published: 16 May 2023

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Journal articles on the topic "Kinetic of combustion"

1

Qin, Yuelin, Qingfeng Ling, Wenchao He, Jinglan Hu, and Xin Li. "Metallurgical Coke Combustion with Different Reactivity under Nonisothermal Conditions: A Kinetic Study." Materials 15, no. 3 (2022): 987. http://dx.doi.org/10.3390/ma15030987.

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The combustion characteristics and kinetics of high- and low-reactivity metallurgical cokes in an air atmosphere were studied by thermogravimetric instrument. The Coats–Redfern, FWO, and Vyazovkin integral methods were used to analyze the kinetics of the cokes, and the kinetic parameters of high- and low-reactivity metallurgical cokes were compared. The results show that the heating rate affected the comprehensive combustion index and combustion reaction temperature range of the cokes. The ignition temperature, burnout temperature, combustion characteristics, and maximum weight-loss rate of low-reactivity coke (L-Coke) were better than high-reactivity coke (H-Coke). Low-reactivity coke had better thermal stability and combustion characteristics. At the same time, it was calculated via three kinetic analysis methods that the combustion activation energy gradually decreased with the progress of the reaction. The coke combustion activation energy calculated by the Coats–Redfern method was larger than the coke combustion activation energy calculated by the FWO and Vyazovkin methods, but the laws were consistent. The activation energy of L-Coke was about 4~8 kJ/mol more than that of H-Coke.
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2

Zhang, Yong Feng, Xiang Yun Chen, Quan Zhou, Qian Cheng Zhang, and Chun Ping Li. "Combustion Kinetic Analysis of Lignite in Different Oxygen Concentration." Advanced Materials Research 884-885 (January 2014): 37–40. http://dx.doi.org/10.4028/www.scientific.net/amr.884-885.37.

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Combustion behavior of indigenous lignite in oxygen-enriched conditions was investigated by using thermogravimetric analyzer (TGA). Combustion tests were carried out in different oxygen concentration (21%O2/79%N2, 30%O2/70%N2, 40%O2/60%N2, 50%O2/50%N2, 60%O2/40%N2, 70%O2/30%N2). Then get the characteristic temperatures. . The model-fitting mathematical approach was used to evaluated the kinetic triplet (f (α),E,A) through Gorbatchev method. The combustion stages were divided into the early combustion stage and the later combustion stage. The calculation showed that the kinetics parameters higher in the early combustion stage than that in the later combustion stage.
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3

Oo, Chit Wityi, Masahiro Shioji, Hiroshi Kawanabe, Susan A. Roces, and Nathaniel P. Dugos. "A Skeletal Kinetic Model For Biodiesel Fuels Surrogate Blend Under Diesel-Engine Conditions." ASEAN Journal of Chemical Engineering 15, no. 1 (2015): 52. http://dx.doi.org/10.22146/ajche.49693.

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The biodiesel surrogate fuels are realistic kinetic tools to study the combustion of actual biodiesel fuels in diesel engines. The knowledge of fuel chemistry aids in the development of combustion modeling. In order to numerically simulate the diesel combustion, it is necessary to construct a compact reaction model for describing the chemical reaction. This study developed a skeletal kinetic model of methyl decanoate (MD) and n-heptane as a biodiesel surrogate blend for the chemical combustion reactions. The skeletal kinetic model is simply composed of 45 chemical species and 74 reactions based on the full kinetic models which have been developed by Lawrance Livermore National Laboratory (LLNL) and Knowledge-basing Utilities for Complex Reaction Systems (KUCRS) under the diesel like engine conditions. The model in this study is generated by using CHEMKIN and then it is used to produce the ignition delay data and the related chemical species. The model predicted good reasonable agreement for the ignition delays and most of the reaction products at various conditions. The chemical species are well reproduced by this skeletal kinetic model while the good temperature dependency is found under constant pressure conditions 2MPa and 4MPa. The ignition delay time of present model is slightly shorter than the full kinetic model near negative temperature coefficient (NTC) regime. This skeletal model can provide the chemical kinetics to apply in the simulation codes for diesel-engine combustion.
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4

Zhu, Zhouyuan, Canhua Liu, Yajing Chen, Yuning Gong, Yang Song, and Junshi Tang. "In-situ Combustion Simulation from Laboratory to Field Scale." Geofluids 2021 (December 14, 2021): 1–12. http://dx.doi.org/10.1155/2021/8153583.

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In-situ combustion simulation from laboratory to field scale has always been challenging, due to difficulties in deciding the reaction model and Arrhenius kinetics parameters, together with erroneous results observed in simulations when using large-sized grid blocks. We present a workflow of successful simulation of heavy oil in-situ combustion process from laboratory to field scale. We choose the ongoing PetroChina Liaohe D block in-situ combustion project as a case of study. First, we conduct kinetic cell (ramped temperature oxidation) experiments, establish a suitable kinetic reaction model, and perform corresponding history match to obtain Arrhenius kinetics parameters. Second, combustion tube experiments are conducted and history matched to further determine other simulation parameters and to determine the fuel amount per unit reservoir volume. Third, we upscale the Arrhenius kinetics to the upscaled reaction model for field-scale simulations. The upscaled reaction model shows consistent results with different grid sizes. Finally, field-scale simulation forecast is conducted for the D block in-situ combustion process using computationally affordable grid sizes. In conclusion, this work demonstrates the practical workflow for predictive simulation of in-situ combustion from laboratory to field scale for a major project in China.
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5

Sun, Minmin, Jianliang Zhang, Kejiang Li, Guangwei Wang, Haiyang Wang, and Qi Wang. "Thermal and kinetic analysis on the co-combustion behaviors of anthracite and PVC." Metallurgical Research & Technology 115, no. 4 (2018): 411. http://dx.doi.org/10.1051/metal/2018064.

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The co-combustion characteristics of anthracite and PVC were investigated by thermogravimetric analysis to study its application in BF. First, the combustion characteristics were investigated. It was found the initial combustion temperature (Ti) of blends decreased with the increase of PVC ratio, while its decreasing rate reached maximum when 10% PVC. Aiming for further characterizing the combustion kinetics, ten gas-solid reaction mechanism functions were adopted for different groups. Results showed that Dimensional Diffusion Model is the best model to describe the combustion kinetics of anthracite and PVC. With this model, combustion kinetic parameters were calculated at 5 °C/min, and the Ea decreases with the addition of PVC. Kinetics compensation effect between the Ea and A was also observed. By Fourier Transform Infrared Spectroscopy (FTIR) analysis, significant differences of elements and functional groups were observed. This study provides theoretical guidance for the utilization of PVC as alternative fuels for BF ironmaking.
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6

Dinde, Prashant, A. Rajasekaran, and V. Babu. "3D numerical simulation of the supersonic combustion of H2." Aeronautical Journal 110, no. 1114 (2006): 773–82. http://dx.doi.org/10.1017/s0001924000001640.

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Results from numerical simulations of supersonic combustion of H2 are presented. The combustor has a single stage fuel injection parallel to the main flow from the base of a wedge. The simulations have been performed using FLUENT. Realisable k-ε model has been used for modelling turbulence and single step finite rate chemistry has been used for modelling the H2-Air kinetics. All the numerical solutions have been obtained on grids with average value for wall y+ less than 40. Numerically predicted profiles of static pressure, axial velocity, turbulent kinetic energy and static temperature for both non-reacting as well as reacting flows are compared with the experimental data. The RANS calculations are able to predict the mean and fluctuating quantities reasonably well in most regions of the flow field. However, the single step kinetics predicts heat release much more rapid than what was seen in the experiments. Nonetheless, the overall pressure rise in the combustor due to combustion is predicted well. Also, the k-ε model is not able to predict the fluctuating quantities in the base region of the wedge where there is strong anisotropy in the presence of combustion.
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7

Gutierrez, Albio D., and Luis F. Alvarez. "Simulation of Plasma Assisted Supersonic Combustion over a Flat Wall." Mathematical Modelling of Engineering Problems 9, no. 4 (2022): 862–72. http://dx.doi.org/10.18280/mmep.090402.

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This work presents a simplified methodology to couple the physics of a nanosecond pulsed discharge to the process of supersonic combustion in a flat wall combustor configuration. Plasma and supersonic combustion are separately simulated and then coupled by seeding plasma-generated radicals on the combustion domain. The plasma model is built assuming spatial uniformity and considering only the kinetic effects of the nanosecond pulsed discharge. Therefore, a zero-dimensional kinetic scheme accounting for the generation of plasma species is utilized. For the combustion model, the complete set of Favre-averaged compressible Navier Stokes equations along with finite rate chemistry is solved through a control-volume based technique via the commercial software Ansys Fluent. The computational results are compared against experimental studies showing that the proposed methodology can capture the main kinetic effects of the nanosecond pulsed discharge on supersonic combustion. OH concentration contours reveal the presence of an enhanced flame when the plasma is applied following the trends from experimental OH PLIF images. In addition, time evolving temperature and OH concentration contours show that the ignition delay time is reduced with the application of the discharge.
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8

Komarov, Ivan, Daria Kharlamova, Bulat Makhmutov, Sofia Shabalova, and Ilya Kaplanovich. "Natural Gas-Oxygen Combustion in a Super-Critical Carbon Dioxide Gas Turbine Combustor." E3S Web of Conferences 178 (2020): 01027. http://dx.doi.org/10.1051/e3sconf/202017801027.

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The paper presents results for chemical kinetics of combustion process in the combustor of oxy-fuel cycle super-critical carbon dioxide gas turbine based on the Allam thermodynamic cycle. The work shows deviation of the normal flame propagation velocity for the case of transition from the traditional natural gas combustion in the N2 diluent environment to the combustion at super-high pressure up to 300 bar in CO2 diluent. The chemical kinetics parametric study involved the Chemkin code with the GRI-Mesh 3.0 kinetic mechanism. This mechanism provides good correspondence between calculation results and test data. The CO2 and N2 diluents temperature, pressure and contents influence the flame propagation velocity and the chemical kinetics parameters in the two gas turbine types. It is demonstrated that the CO2 diluent slows down chemical reactions stronger than the N2 one. The flame propagation velocity in carbon dioxide is four time smaller than in the N2 one. In the oxy-fuel cycle combustor a pressure increase reduces the flame propagation velocity. Increase of the CO2 content from 60 to 79% reduces the flame propagation velocity for 65% at atmospheric pressure and for 94% at super-critical pressure. An increase of the combustor inlet mixture temperature from 300 to 1100 K at super-critical pressure causes the flame propagation velocity increase for 94%. The flame propagation velocities compatible with the traditional gas turbines may be reached at the CO2 diluent content of the O2 + CO2 mixture in the active combustion zone must be below 50%.
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9

Zhang, Yong-Feng, Xiang-Yun Chen, Qian-Cheng Zhang, Chun-Ping Li, and Quan Zhou. "Oxygen-enriched combustion of lignite." Thermal Science 19, no. 4 (2015): 1389–92. http://dx.doi.org/10.2298/tsci1504389z.

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The study is concerned on the oxygen-enriched combustion kinetics of lignite. Thermogravimetric experiments were carried out in a thermogravimetric analyzer under O2/N2 conditions, and operated at different heating rates ranging from 5?C per minute to 25?C per minute. Flynn-Wall-Ozawa method was used to calculate the kinetic parameter. The value of activation energy increased when the oxygen concentration varied from 21% to 70%.
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10

Várhegyi, Gábor, Zoltán Sebestyén, Zsuzsanna Czégény, Ferenc Lezsovits, and Sándor Könczöl. "Combustion Kinetics of Biomass Materials in the Kinetic Regime." Energy & Fuels 26, no. 2 (2011): 1323–35. http://dx.doi.org/10.1021/ef201497k.

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