Improvements on combustion properties of asphaltite and correlation of activation energies with combustion results

Hicyilmaz, C
Altun, Naci Emre
Processing of Sirnak Asphaltite sample by gravity and flotation concentration methods was investigated to decrease its ash content. Finely disseminated inorganic constituents of asphaltite revealed the difficulty of operation. Ash content of asphaltite was reduced from 44.86% to 31.44% by gravity concentration method with a 75% combustible recovery. On the other hand, it was possible to reduce ash content to 24% by flotation with almost same combustible recovery. Combustion characterization of raw and improved asphaltites was performed by non-isothermal thermogravimetric experiments. The data obtained were analyzed for the determination of activation energy of asphaltite samples. Processing proved to improve the combustion characteristics of asphaltite where activation energies showed the same trend with ash contents of asphaltite samples and decreased from 47.75kJ/mol of raw asphaltite to 30.24kJ/mol. As a result, activation energies were correlated with ash contents, calorific values, burn-out temperatures and sulfur contents of processed samples.


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Hicyilmaz, Cahit; Ozun, Savas; Altun, Naci Emre (American Chemical Society (ACS), 2006-09-20)
In this study, the rheological characteristics of asphaltite- water slurries ( AWSs) were investigated with respect to some of the most important parameters in the preparation of slurries. The effects of pulp density, chemical addition, pulp pH, and particle size on the rheological behavior and viscosity of AWSs were studied. The role of demineralization of asphaltite was also investigated, and rheological properties of raw and relatively demineralized asphaltites were compared. Results showed that viscosit...
Modeling and numerical simulations of lignite char gasification with CO2: The effect of gasification parameters on internal transport phenomena
Karaca, Mehmet; Kaya, Deniz; Yozgatlıgil, Ahmet; Gokalp, Iskender (Elsevier BV, 2021-02-01)
The purpose of this study is to develop an experimental data-based char particle gasification model in order to assess the effects of particle size, gasification temperature and char generation heating rate on global gasification parameters. Also, the effect of initial porosity is observed by performing parametrical numerical simulations. A continuum-based model is used to solve the gasification inside a char particle and within the external boundary layer. The intrinsic rate of CO2 gasification reaction is...
Determination of wettability and its effect on waterflood performance in limestone medium
Karabakal, U (American Chemical Society (ACS), 2004-03-01)
Wettability measurement methods, the effect of wettability on fluid distribution, and fluid flow in porous media were discussed, and the influence of rock wettability on the relative permeability and recovery of oil by waterflooding were investigated. Experimental studies were conducted on a total of 23 core plugs from two different limestone formations. Synthetic brine (NaCl solution) and mineral oil, which has a viscosity ratio of similar to10, were used as the test fluids. Core samples, saturated with sy...
Analytical investigation of wet combustion process for heavy oil recovery
Bağcı, Ali Suat (Informa UK Limited, 2004-12-01)
Analysis of combustion tube data produced from experiments performed under realistic reservoir conditions is currently the most valid method of investigating in-situ combustion process. In this study, the optimization of water-air ratio for B. Kozluca heavy crude oil, and the comparison of the performance of dry and wet forward combustion processes were studied. An analytical model was used to extend the laboratory results so that the oil production and steam zone volume can be estimated under field conditi...
Experimental and Numerical Simulation of Oil Recovery from Oil Shales by Electrical Heating
Hascakir, Bema; Babadagli, Tayfun; Akın, Serhat (American Chemical Society (ACS), 2008-11-01)
The recovery characteristics of four different oil shale samples were tested experimentally using the retort technique. To accomplish efficient temperature distribution, the thermal conductivity of the oil shale samples was increased by the addition of three different iron powders. The doses of iron powders were optimized for each oil shale sample based on the highest oil production value experimentally. The experiments were then modeled using the electrical heating option of a commercial reservoir simulato...
Citation Formats
C. Hicyilmaz and N. E. Altun, “Improvements on combustion properties of asphaltite and correlation of activation energies with combustion results,” FUEL PROCESSING TECHNOLOGY, pp. 563–570, 2006, Accessed: 00, 2020. [Online]. Available: