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Thermogravimetric analysis is a standard experimental method to determine kinetic data for heterogeneous coal char reactions. However, it is necessary to implement a sample holder to weigh the char sample, which may influence the mass and heat transfer towards the crucible. Thus, in this work the heat and mass transfer phenomena in a TGA were investigated. Experiments were carried out with hearth...
The reduction characteristics of hematite particles (i.e., Fe2O3) in H2 and CO atmospheres were experimentally investigated using isothermal thermo-gravimetric analysis (TGA). The mean diameter of the hematite powder (dP,m) was about 0.74μm. A mixture of pure hydrogen (H2) and carbon monoxide (CO) gases was used as a reductant at a fixed flow rate of 0.1lpm. Nitrogen (N2) was used as a diluent gas...
Nowadays, the development of biodegradable products is important in improving energy efficiency and green environment, particularly in energy conservation and rotation of machinery systems. In the case of sliding components, lubrication system and lubricant quality plays an important role for energy efficiency as it is directly involved with frictional force and components wear characteristics. The...
In this paper, the analysis of the oxidative degradation of biodiesel blends were explored using the following instrumental methods: Fourier transform infrared spectroscopy (FTIR), Ultraviolet–visible spectroscopy (UV–Vis), thermogravimetric analysis (TGA) and two-channel and differential dielectric spectroscopy (TD-DES). During the degradation process, a good consistency could be observed between...
Residue hydroprocessing is one of the important processes in refinery to get maximum benefit. Coke deposition on the catalyst and on the interior of parts of the unit is a major challenge to process the residue having high concentration of metals and micro carbon residues. In this regard, three vacuum residues of different refineries are used to study the hydroprocessing activities on NiMo/Al2O3 catalyst...
The purpose of this work is the kinetic study of biomass char combustion in isothermal conditions in TGA. This char was obtained from fast pyrolysis of beech bark pellet in a fluidized bed reactor at 850°C and atmospheric pressure. Kinetic study of isothermal char combustion was performed for temperatures up to 400°C, oxygen partial pressures ranging from 5065 to 21,273Pa and a char particles size...
This study investigated the combustion behavior and kinetics of Turkish fuels. Two lignite coals from Tunçbilek and Soma region, and olive residue, were used, all within a size range of 106–125µm. Experiments were performed in a thermogravimetric analyzer (TGA) coupled with a differential thermal analyzer (DTA), under three different heating rates, namely 15, 20, and 40°C/min. Based on the weight...
The effect of different oxygen concentration and heating rates on the mass loss and the formation of gaseous products (NH3, N2O and CO) during the thermolysis process of solid urea was studied and discussed by experiments, and the production mechanism of N2O and CO was also explored and proposed. Experimental results show that there were four major stages of mass loss in each TGA curve and two sharp...
The available data on intrinsic kinetic parameters of wood char combustion is limited in the literature. The intrinsic reactivity of porous char particles reflects the variance in the pore structure resulted from various compositions of parent biomass or coal fuels. In this study detailed kinetic models for calculating the intrinsic reaction rate and the Arrhenius parameters in two combustion zones...
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