The study of the influence of particle sizes on the thermal decomposition of minerals present in solid fuel

1989 ◽  
Vol 146 ◽  
pp. 63-73 ◽  
Author(s):  
Vitaly Yu. Zakharov
Keyword(s):  
Thermal Decomposition ◽  
Solid Fuel ◽  
Particle Sizes

Effects of Ca2+ Concentration on Calcium Carbonate Crystallization in Egg White Protein Solution

2011 ◽  
Vol 197-198 ◽  
pp. 199-202 ◽  
Author(s):  
Wen Kun Zhu ◽  
Xue Gang Luo ◽  
Xiao Yan Lin ◽  
Jing He
Keyword(s):  
Thermal Decomposition ◽  
Calcium Carbonate ◽  
Egg White ◽  
Particle Sizes ◽  
Protein Solution ◽  
Solution System ◽  
Egg White Protein ◽  
Ft Ir

The calcium carbonate crystallization were controlled by Ca2+ concentration in the 10% (V/V) egg white protein solution and the morphology, structure and thermal decomposition of which were characterized by FT-IR, SEM, XRD and TG. The results showed in egg white protein solution system, concentration of Ca2+ had significant effects on the crystallized morphology, orientation and crystallinity of calcium carbonate. Calcium carbonate particles have more uniformed calcite and vaterite mixed crystallization in low Ca2+ concentration while calcium carbonate tends to form mixed particle sizes and more complete calcite crystallization in high Ca2+ concentration.

Thermal decomposition study of hydroxyl-terminated polybutadiene (HTPB) solid fuel

1996 ◽  
Vol 275 (2) ◽  
pp. 181-191 ◽  
Author(s):  
Yeu-Cherng Lu ◽  
Kenneth K. Kuo
Keyword(s):  
Thermal Decomposition ◽  
Solid Fuel

Preparation of Nanosized Strontium Titanate Powder by a Nitrilotriacetate Precipitation Method

2013 ◽  
Vol 734-737 ◽  
pp. 2324-2327 ◽  
Author(s):  
Wen Bin Yan ◽  
Feng Gao ◽  
Jun Hua ◽  
You Ji Li
Keyword(s):  
Thermal Decomposition ◽  
Nitrilotriacetic Acid ◽  
Sem Analysis ◽  
New Method ◽  
Precipitation Method ◽  
Particle Sizes ◽  
Complex Ions ◽  
Electronic Ceramics ◽  
The Mean ◽  
Simple Technology

A new method that nanoSrTiO3 electronic ceramics powder was prepared from nitrilotriacetic acid complexes by thermal decomposition was proposed. The reaction of Ti4+ and ta3-(H3ta=C6H6O6N) and H2O2 is occurred to form [Ti2O(O2)2(ta)2]4- complex ions, which react with Sr2+ to produce Sr2[Ti2O(O2)2(ta)2] precursor, and then is washed, dried and annealed at 900°Cfor 3h to prepare nanoSrTiO3 powder. The results of SEM analysis show that SrTiO3 powders were spheric shape with narrow size distribution and the mean particle sizes about 80 nm. XRD investigation show that the powders of SrTiO3 had the crystalline of the pseudo-cubic structure. The Sr/Ti mole ratio (1.000±0.005) and the purity of 99.8% were confirmed by chemical analysis. Compared with conventional thermal decomposition method of oxalate, the proposed new method, by which the high-quality SrTiO3 powder is prepared, shows simple technology.

scholarly journals Modeling of heat and mass transfer during thermal decomposition of a single solid fuel particle

2013 ◽  
Vol 34 (2) ◽  
pp. 53-71 ◽  
Author(s):  
Izabela Wardach-Święcicka ◽  
Dariusz Kardaś
Keyword(s):  
Mass Transfer ◽  
Thermal Decomposition ◽  
Physical Properties ◽  
Heat And Mass Transfer ◽  
Solid Particle ◽  
Solid Fuel ◽  
Alternative Fuels ◽  
Solid Phase ◽  
Fuel Particle ◽  
Pyrolysis Process

Abstract The aim of this work was to investigate the heat and mass transfer during thermal decomposition of a single solid fuel particle. The problem regards the pyrolysis process which occurs in the absence of oxygen in the first stage of fuel oxidation. Moreover, the mass transfer during heating of the solid fuels is the basic phenomenon in the pyrolysis-derived alternative fuels (gas, liquid and solid phase) and in the gasification process which is focused on the generation of syngas (gas phase) and char (solid phase). Numerical simulations concern pyrolysis process of a single solid particle which occurs as a consequence of the particle temperature increase. The research was aimed at an analysis of the influence of particle physical properties on the devolatilization process. In the mathematical modeling the fuel grain is treated as an ideal sphere which consists of porous material (solid and gaseous phase), so as to simplify the final form of the partial differential equations. Assumption that the physical properties change only in the radial direction, reduces the partial derivatives of the angular coordinates. This leads to obtaining the equations which are only the functions of the radial coordinate. The model consists of the mass, momentum and energy equations for porous spherical solid particle heated by the stream of hot gas. The mass source term was determined in the wide range of the temperature according to the experimental data. The devolatilization rate was defined by the Arrhenius formula. The results of numerical simulation show that the heating and devolatilization time strongly depend on the physical properties of fuel. Moreover, proposed model allows to determine the pyrolysis process direction, which is limited by the equilibrium state.

scholarly journals Metal Nanoparticles: Thermal Decomposition, Biomedicinal Applications to Cancer Treatment, and Future Perspectives

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Ayodele Temidayo Odularu
Keyword(s):  
Thermal Decomposition ◽  
Cancer Treatment ◽  
Metal Nanoparticles ◽  
Small Particle ◽  
Anticancer Agent ◽  
Biological Evaluation ◽  
Particle Sizes ◽  
Future Perspectives ◽  
Characterization Techniques ◽  
Controlled Morphology

Monodispersed forms of metal nanoparticles are significant to overcome frightening threat of cancer. This review examined pragmatically thermal decomposition as one of the best ways to synthesize monodispersed metal nanoparticles which are stable and of small particle sizes. Controlled morphology for delivery of anticancer agent to specific cells can also be obtained with thermal decomposition. In addition to thermal decomposition, the study also looked into processes of characterization techniques, biological evaluation, toxicity of nanoparticles, and future perspectives.

scholarly journals The Effect of Al Particles Size on the Thermal Behavior and Kinetics of Al-MnO2 Thermite System

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Jia-xing Song ◽  
Tao Guo ◽  
Wen Ding ◽  
Miao Yao ◽  
Li Yang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Thermal Behavior ◽  
Exothermic Reaction ◽  
Exothermic Peak ◽  
Decomposition Process ◽  
Particle Sizes ◽  
Ultrasonic Dispersion ◽  
Thermal Decomposition Process ◽  
Al Powder

Micron-MnO2 powder has unique thermal decomposition process compared with other metal oxides, and the different characteristics of components in thermite could affect the thermal performance of the whole system directly. In this work, the Al powder with different three particle sizes was combined with micron-MnO2 to prepare the Al-MnO2 thermite system, and the effect of Al powder particle sizes on the whole thermal behavior was studied. Firstly, the thermal decomposition process of micron-MnO2 and purity of Al powder are tested by TG-DSC. By using ultrasonic dispersion method, the fuel-rich thermite samples were prepared and characterized by SEM and TG-DSC at different heating rates. The Kissinger method was also employed to calculate the activation energy for the first exothermic peak. It was found that the thermal decomposition process of MnO2 in the thermite system can be significantly disturbed by different Al particles size. In other words, the effect of Al particle sizes on the thermite can be magnified due to the unique decomposition properties of micron-MnO2 instead of onset temperature of exothermic reaction changing simply. The activation energy of thermite system decreased with the reduction of Al particle sizes in micron-level, while in nanolevel the activation energy markedly increased. Finally, the possible reasons for phenomenon were discussed.

Sign in / Sign up

Export Citation Format

Share Document