scholarly journals Mineralogical Characteristics and Isothermal Oxidation Kinetics of Ironsand Pellets

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 265 ◽  
Author(s):  
Yaozu Wang ◽  
Jianliang Zhang ◽  
Zhengjian Liu
Keyword(s):  
Reaction Mechanism ◽  
Chemical Reaction ◽  
Silicon Oxide ◽  
Early Stage ◽  
Calculated Data ◽  
Isothermal Oxidation ◽  
Random Nucleation ◽  
Iron Aluminum ◽  
Chemical Reaction Mechanism ◽  
Mineralogical Characteristics

An in-depth understanding of mineralogical characteristics and the oxidation behaviors of ironsand is of great significance to make the best of ironsand and develop Ti-containing pellets. This paper quantitatively characterized the mineralogical characteristics of the ironsand from East Java in Indonesia through X-ray diffraction (XRD-Rietveld) and scanning electron microscope (SEM-EDS). The results indicated that the mineral composition of the ironsand was magnetite (22.7%), titanomagnetite (40.9%), enstatite (17.1%), hematite–ilmenite solid solution (14.5%), and magnesium iron aluminum silicon oxide (5.8%). The microstructure characterization of pellets after oxidation showed that the porosity of the pellets decreased from 20.7% to 11.7% with temperatures ranging from 1073 to 1473 K. Moreover, the activation energies of ironsand pellets were calculated by using model-function method. The calculated data of different mechanism functions indicated that the chemical reaction mechanism for the early stage of the oxidation fit A2 (random nucleation and nuclei growth) well, the chemical reaction mechanism for the post-oxidation at 1073–1273 K fit F1 (chemical reaction) well, and the chemical reaction mechanism for the post-oxidation at 1373 and 1473 K fit D4 (diffusion) well. The reaction mechanism and the limited link was finally discussed based on the kinetic analysis and the mineralogical characteristics.

Parametric Study of Moss-Brookes (MB) and Moss-Brookes-Hall (MBH) Model Constants for Prediction of Soot Formation in a Turbulent Hydrocarbon Flames

2013 ◽  
Author(s):  
Pravin Rajeshirke ◽  
Pravin Nakod ◽  
Rakesh Yadav ◽  
Stefano Orsino
Keyword(s):  
Reaction Mechanism ◽  
Chemical Reaction ◽  
Parametric Study ◽  
Soot Formation ◽  
Hydrocarbon Flames ◽  
Oxidation Rates ◽  
Numerical Predictions ◽  
Chemical Reaction Mechanism ◽  
Soot Precursors ◽  
Original Works

In the present work, two equation soot models proposed by Moss-Brookes (MB) and Moss-Brookes-Hall (MBH), available in ANSYS FLUENT14.5, are used to study the soot formation in a turbulent kerosene-air flame. The model constants in the original works of MB and MBH model were primarily tuned for the methane-air or other lower hydrocarbon flames. In this work, the emphasis has been given on the applicability of these models in modeling the soot formation in heavy hydrocarbon fuels. The current work is primarily focused on the parametric study of the various modeling constants for calculating the soot inception and oxidation rates. A parametric study is performed to calculate the soot inception rates by considering different soot precursors like C2H2, C2H4, C6H6 and C6H5. Steady laminar flamelet approach with a detailed chemical reaction mechanism (Jet_SurF_2.0), is used for modeling gas phase combustion. The current numerical predictions are compared with experimental results of Young et al. [1] and earlier published numerical results of Wen et al. [2]. The study is further extended to understand the role of chemical reaction mechanism on soot predictions considering detailed versus reduced (JP10revC) chemical mechanisms.

A simplified chemical reaction mechanism for two-component RP-3 kerosene surrogate fuel and its verification

Fuel ◽  
2018 ◽  
Vol 227 ◽  
pp. 127-134 ◽  
Author(s):  
Yingwen Yan ◽  
Yuchen Liu ◽  
Wen Fang ◽  
Yunpeng Liu ◽  
Jinghua Li
Keyword(s):  
Reaction Mechanism ◽  
Chemical Reaction ◽  
Chemical Reaction Mechanism ◽  
Two Component ◽  
Surrogate Fuel
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