Investigation of SO2 removal characteristics with limestone under oxycombustion conditions

Download

index.pdf

Date

2019

Author

Avşaroğlu, Sevil

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

258
views

187
downloads

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. Three temperature regions in pyrolysis are due to moisture release, volatile matter release and calcite decomposition in N2 and char gasification in CO2 atmosphere. In combustion study, the third temperature region shows the oxidation of char. Due to Turkish lignites having high sulphur content, capturing of SO2 emissions with limestone addition during oxy-combustion is studied. The studies showed the main effect of CO2 concentration is to determine whether the limestone will undergo calcination (indirect sulfation) or not (direct sulfation) at the same temperature. Generating oxycombustion conditions that allow indirect sulfation, results in a more effective use of limestone to capture SO2. At the end of eight-hour period, the sulfur conversion of direct sulfation at 800 °C was 30%. However, for the indirect sulfation sulfur conversion was 58%. For 15% CO2, sulfur conversion doubles at higher temperatures due to calcination and indirect sulfation of limestone. In sulfation studies, the other parameters that are examined were temperature, SO2 concentration in the gas mixture, particle size and limestone type. When Çan and Çumra limestone are compared, calcination of these limestones occurred at the same condition. However, Çan limestone resulted in higher sulfur conversion values (about 60%) due to higher surface area. Dolomite results showed lower sulfur conversions (about 12% at 800 °C, and 28-37% at 900 °C) as compared to limestone samples.

Subject Keywords

Combustion., Coal, Combustion, Oxy-combustion, Emissions, SO2 capture.

URI

http://etd.lib.metu.edu.tr/upload/12624456/index.pdf
https://hdl.handle.net/11511/44553

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Study of water-oil emulsion combustion in large pilot power plants for fine particle matter emission reduction Allouis, Christophe Gerard; L'Insalata, A.; Fortunato, L.; Saponaro, A.; Beretta, F. (2007-04-01) The combustion of heavy fuel oil for power generation is a great source of carbonaceous and inorganic particle emissions, even though the combustion technologies and their efficiency are improving. The information about the size distribution function of the particles originated by trace metals present into the fuels is not adequate. In this paper, we focused our attention the influence of emulsion oil-water on the larger distribution mode of both the carbonaceous and metallic particles. Isokinetic sampling ...
Combustion Models for Industrial Applications (COMBINA) Uzol, Oğuz(2013-2-28) Combustion processes are an essential component of energy conversion and their accurate modeling is required if the objectives of reduction of fuel consumption and emissions are to be realized. Meeting these requirements will involve a substantial effort, in particular towards the development and availability of accurate and reliable simulation tools for reactive flows and more experimental data. In the COMBINA project, collaboration between a CFD software developing SME, which is coordinating this project,...
Finding an energy efficient path for plug-in electric vehicles with speed optimization and travel time restrictions Erdoğan, Bilgenur; Tural, Mustafa Kemal; Atashi Khoei, Arsham (2023-02-01) Transportation is one of the main factors when global total energy consumption is considered and is a significant contributor to emissions of harmful gases including carbon dioxide (CO2). Due to their lower tailpipe CO2 emissions compared to the vehicles with internal combustion engines, electric vehicles provide an opportunity to reduce environmental impacts of transportation. In this direction, a problem for plug-in electric vehicles (PEVs) is studied where the aim is to find an energy efficient path. Giv...
Investigation of co-combustion characteristics of low quality lignite coals and biomass with thermogravimetric analysis Varol, Murat; Atımtay, Aysel; Bay, B.; Olgun, H. (2010-10-20) In this study, combustion and co-combustion characteristics of three biomass fuels and three Turkish lignite coals were investigated by using a thermo gravimetric analyzer. There are just a few studies investigating the co-combustion characteristics of coal and biomass, and the synergistic effect of their various combinations on the peak temperatures and burnout times.
On the applicability of progress variable approach for large eddy simulation of premixed flames Tekgül, Bulut; Aksel, Mehmet Haluk; Baran, Özgür Uğraş; Department of Mechanical Engineering (2017) Combustion applications are the primary energy source and will continue to be for the near future. Therefore, accurate modeling of combustion applications is crucial to study and improve the processes. In this study, progress variable approach is used with the implementation of a source term found in literature to simulate selected fully premixed combustion applications. CFD computations and preprocessing steps were conducted using OpenFOAM C++ library. Thermophysical values were obtained from zero and one ...

Citation Formats

S. Avşaroğlu, “Investigation of SO2 removal characteristics with limestone under oxycombustion conditions,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Environmental Engineering., Middle East Technical University, 2019.