Abstract:A combination of mechanical activation and Differential Thermal Analysis (DTA) together with X-Ray Diffraction (XRD), and various microstractural characterization techniques were used to evaluate the starting reaction in the combustion synthesis of TiC-Al2O3 composite in TiO2-Al-C system. The mechanical activation was performed on the mixtures of two components of TiO2/Al, Al/C and ...

Nickel titanium (NiTi) foams were made by combustion synthesis of powders with the help of ZrH2 as foaming agent and TiB2 as endothermic agent. In this paper, we investigated the effect of elemental powder size on the foaming. The powder size of Ni and Ti affected the ignition temperature of the combustion reaction, cell morphology and microstructure of the foams. The cell morphology of the foa...

We study a mathematical model for high Lewis number combustion processes with the reaction rate of the form of an Arrhenius aw with or without an ignition cut-off. An efficient method for the proof of the existence and uniqueness of combustion fronts is rovided by geometric singular perturbation theory. The fronts supported by the model with very large Lewis numbers are small erturbations of th...

This study presents an experimental evaluation of the rate of nitric oxide reduction on the char surface. It addresses the claim that the rate for the destruction of nitric oxide on the char surface has been underpredicted due to char deactivation in the process of char formation. Experiments conducted with chars produced in situ, char previously produced at pulverized combustion conditions, an...

The Cluster of Excellence (CoE) ̈Tailor-Made Fuels from Biomass ̈ (TMFB) takes an interdisciplinary research approach towards new synthetic fuels based on biomass feedstock. New target-designed synthesis pathways, employing novel catalytic systems, reaction solvents and tightly integrated production processes, which embed intensified process units for fuel production, are considered to create new...

Biomass co-firing is becoming a promising solution to reduce CO2 emissions, due to its renewability and carbon neutrality. Biomass normally has high moisture and volatile contents, complicating its combustion behaviour, which is significantly different from that of coal. A computational fluid dynamics (CFD) combustion model of a single biomass particle is developed in this work, to predict the ...

A modified solution combustion approach was used for the first time in the preparation of nanosize zirconia toughened alumina (ZTA) composite. ZTA-1 with an average particle size of 37 nm was prepared using corresponding metal nitrates and urea. ZTA-2 with an average particle size of <10 nm was prepared by using mixture of fuels such as ammonium acetate, urea and glycine. The products formed we...

Combustion hazards associated with liquid fuels are often categorized in terms of the fuel’s flashpoint. However, in hazard scenarios where high-flashpoint fuel is released under pressure, jet breakup and aerosol formation will result. In these cases, this simplistic method of combustion hazard classification may be not sufficient and then alternative approaches are required. As for gases and d...

Combustion-tube tests were conducted on a tar of physical and chemical characteristics similar to a natural reservoir tar. Ottawa sand of 20-30 mesh size was used to prepare tar-sand mixtures of about 37% porosity, 19 to 25% water saturation and 21 to 32% tar saturation. In runs with distilled water, a combustion front was successfully initiated and moved into the sand pack. Later, however, the...