Effect of pressure on combustion kinetics of heavy oils

Bağcı, Ali Suat
In this study, 16 experiments were conducted to study the effects of pressure on crude oil oxidation in limestone medium. Karakus (29 degrees API), Beykan (32 degrees API), Bati Raman (12 degrees API), Camurlu ( 12 degrees API), Adiyaman (26 degrees API), Garzan (28 degrees API) and Raman (18 degrees API) crude oil from Turkish oil fields were used. The mixture of limestone and the crude oil was subjected to a controlled heating schedule under a constant flow rate of air. The produced gas was analyzed for its oxygen and carbon oxides contents. The results of reaction kinetics showed that the molar CO2/CO ratio values of fuel combustion increased with increasing pressure. A decrease in the atomic H/C ratio with an increase in temperature was observed for all runs. Results indicate that oxygen consumed increases with increasing operating pressure. This means more fuel is burnt by increasing the pressure, which is due to the effect of pressure on the volatility of the oil components. Because increasing pressure will depress oil volatility, the fuel availability would increase. This also suggests that distillation might be the dominant mechanism for fuel deposition. A trend of increase in activation energy values by increasing pressure is observed.


Effect of heating rate on thermal properties and kinetics of raw and cleaned coal samples
Özbas, Kazim Esber; Hicyilmaz, Cahit; Kök, Mustafa Verşan (Informa UK Limited, 2003-01-01)
In this article, thermogravimetry (TG/DTG) was used to determine the effect of heating rate on the thermal properties and kinetics of raw and cleaned coal samples from Soma, Tuncbilek, and Afsin Elbistan regions. TG/DTG experiments were carried out at 4 different heating rates (5, 10, 15, and 20degreesC/min). Generally, for all of the samples higher peak and burnout temperatures were measured with an increasing heating rate. Kinetic parameters of the samples were determined using an Arrhenius-type kinetic m...
Influence of coal briquette size on the combustion kinetics
Altun, Naci Emre; Bagci, AS (Elsevier BV, 2004-08-15)
In this study, the effects of one of the most important parameters in coal briquetting process, the briquette size, on the combustion behaviour of coal briquettes were determined from the view of combustion kinetics, i.e. their liability to ignite and combust. Effect of size on the combustion kinetics was treated by two different approaches. The first one consists of combustion kinetics experiments with briquettes of increasing sizes, thus of expanding volumes. In the second phase, briquette dimensions were...
Effect of inlet pressure on crude oil combustion -laboratory approach-
Kök, Mustafa Verşan; Nurgaliev, Danis K. (Elsevier BV, 2021-03-01)
In this research, the effect of inlet pressure on combustion behavior of medium and light crude oils was analyzed with TGA and DSC experiments. The ramped temperature combustion experiments were performed at constant heating rates under air atmosphere. TGA curves revealed three main reaction regions known as low temperature oxidation (LTO), fuel deposition (FD), and high temperature oxidation (HTO). In DSC curves, at the early stage of the heating, distillation region was also observed in addition to LTO an...
Effect of crude oil type and heating rate on combustion of crude oil-lignite mixtures
Kök, Mustafa Verşan (Elsevier BV, 1992-01-01)
Research was conducted to investigate the possibility of upgrading low-quality lignites by mixing them with heavy crude oils. Three crude oil samples with API gravities of 12.9, 18.7 and 26.7 were mixed with lignite to form mixtures of 10 and 20% oil content. Thermal analysis experiments were conducted at non-isothermal heating conditions at heating rates of 5-100 K min-1. Differential thermogravimetric data were analysed using an Arrhenius-type reaction model assuming a first-order reaction. The results in...
Effects of operational parameters and ultrasonic pretreatment on supercritical CO2 extraction of diesel fuel from soil
Guvenc, A; Mehmetoglu, U; Mehmetoglu, T (Informa UK Limited, 2004-01-01)
Supercritical fluid extraction (SFE) using CO2 was performed on soil material artificially contaminated with diesel fuel. Raising the temperature from 313 K to 343 K caused the recovery efficiency to increase from 52 to 76%. Pressure and CO2 flow rate were found to be less important. As expected, increasing extraction time resulted in higher recoveries. Ultrasonic pretreatment of the soil material was found to be very effective, possibly due to disrupting the strong interaction bonding between soil matrix a...
Citation Formats
A. S. Bağcı, “Effect of pressure on combustion kinetics of heavy oils,” ENERGY SOURCES, pp. 887–898, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/62364.