Optimization of process parameters in oxygen enriched combustion of biocoal and soma lignite blends by response surface methodology

Keivani, Babak
Atımtay, Aysel
Co-combustion of coal and biomass in power plants has the potential to reduce emissions compared to burning coal alone. However, the use of biomass with coal in power plants has its own limitations. For this reason, biomass and coal are not often used together in power plants. Torrefaction is a method that can be used to eliminate / reduce all these negative effects. Torrefied biomass (biocoal) prepared under 300 degrees C and 30 min has similar properties to selected Turkish lignite. Existing power plants will improve CO2 capture by using oxygen enriched combustion: a promising retrofitting option. In this study Response Surface Methodology (RSM) by using Central Composite Designs (CCD) were performed to obtain the optimal conditions for the oxygen enriched combustion (OEC) of a biocoal / Soma Lignite blends. It was found that the proportion of biocoal in the blend was the most effective parameter for the all responses. Besides, the interactions of the two factors (the oxygen concentration and the proportion of biocoal in the blend) for all responses were successfully described by the Central Composite Design (CCD) model. Also, the process of oxygen enriched combustion optimization results showed that optimum values of oxygen concentration and the proportion of biocoal in the blend to minimize the CO, NOx and the bed temperature values, and to maximize the CO2 and combustion efficiency values were selected as 22.8 % by vol. and 37.2 % by wt., respectively. On the other hand, CO2 concentration in the flue gas increased when 50 % biocoal is added to lignite mixture which increases energy efficiency. Since the concentration of CO2 in the flue gases increased, the CO2 in the flue gases can be separated and captured by using CCS technology that is considered as the most energy and cost efficient technology.


Determination of the optimal equipment fleet for overburden stripping operation in a surface coal mine with discrete event simulation
Aytaç, Şahabettin Mert; Erkayaoğlu, Mustafa; Department of Mining Engineering (2021-8-31)
Coal has a significant role in energy production, which is an essential factor in sustainable development. Overburden removal and coal production capacities have to be increased to provide sufficient amount and quality of coal continuously to thermal power plants to meet the increasing energy demand. In this study, discrete event simulation was implemented to determine the optimum equipment fleet for overburden removal operation in a surface coal mine. According to the long-term plan prepared by the company...
Co-firing biomass with coal in bubbling fluidized bed combustors
Göğebakan, Zuhal; Selçuk, Nevin; Department of Chemical Engineering (2007)
Co-firing of biomass with coal in fluidized bed combustors is a promising alternative which leads to environmentally friendly use of coal by reducing emissions and provides utilization of biomass residues. Therefore, effect of biomass share on gaseous pollutant emissions from fluidized bed co-firing of various biomass fuels with high calorific value coals have extensively been investigated to date. However, effect of co-firing of olive residue, hazelnut shell and cotton residue with low calorific value lign...
Emissions of NOx and SO2 from Coals of Various Ranks, Bagasse, and Coal-Bagasse Blends Burning in O-2/N-2 and O-2/CO2 Environments
Kazanç Özerinç, Feyza; Crnkovic, Paula Manoel; Levendis, Yiannis A. (2011-07-01)
Oxy-coal combustion is a viable technology, for new and existing coal-fired power plants, as it facilitates carbon capture and, thereby, can mitigate climate change. Pulverized coals of various ranks, biomass, and their blends were burned to assess the evolution of combustion effluent gases, such as NOx, SO2, and CO, under a variety of background gas compositions. The fuels were burned in an electrically heated laboratory drop-tube furnace in O-2/N-2 and O-2/CO2 environments with oxygen mole fractions of 20...
Investigation of SO2 removal characteristics with limestone under oxycombustion conditions
Avşaroğlu, Sevil; Sanin, F. Dilek.; Department of Environmental Engineering (2019)
One of the technologies to increase combustion efficiency and decrease CO2 and other emissions is Oxy-Fuel Combustion. Combustion efficiency is higher and emissions are lower when the oxygen concentration of air is higher. In this thesis different characteristics of two indigenous Turkish lignites are investigated by Thermal Gravimetric Analysis (TGA). Pyrolysis is carried out under both N2 and CO2 atmospheres and combustion characteristics is also examined. CO2 acts as an inert gas at lower temperatures. T...
Infrared measurement of biomass combustion in a wire mesh reactor
Uluca, Kıvanç; Kazanç Özerinç, Feyza; Department of Mechanical Engineering (2019)
As a consequence of increasing emissions due to the global energy production, new clean combustion options which utilize biomass are being sought. Prior to using biomass in an industrial boiler, the combustion characteristics of the fuel have to be assessed so that the boiler and furnace can be designed or retrofitted. In this study, olive residue (OR), endogenous agricultural residue of Turkey was investigated using a wire mesh reactor (WMR) coupled with two infrared cameras. These cameras recorded radiome...
Citation Formats
B. Keivani, H. OLGUN, and A. Atımtay, “Optimization of process parameters in oxygen enriched combustion of biocoal and soma lignite blends by response surface methodology,” JOURNAL OF CO2 UTILIZATION, vol. 55, pp. 0–0, 2022, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/95260.