Investigation of ash deposition in a pilot-scale fluidized bed combustor co-firing biomass with lignite

Gogebakan, Zuhal
Gogebakan, Yusuf
Selçuk, Nevin
Seliuk, Ekrem
This study presents the results from investigation of ash deposition characteristics of a high ash and sulfur content lignite co-fired with three types of biomass (olive residue, 49 wt%; hazelnut shell, 42 wt%; and cotton residue, 41 wt%) in 0.3 MWt Middle East Technical University (METU) Atmospheric Bubbling Fluidized Bed Combustion (ABFBC) Test Rig. Deposit samples were collected on all air-cooled probe at a temperature of 500 degrees C. Samples were analyzed by SEM/EDX and XRD methods. The results reveal that co-firing lignite with olive residue, hazelnut shell and cotton residue show low deposition rates. High concentrations of silicon, calcium, sulfur, iron, and aluminum were found in deposit samples. No chlorine was detected in deposits. Calcium sulfate and potassium sulfate were detected as major and minor components of the deposits, respectively. High sulfur and alumina-silicate content of lignite resulted in formation of alkali sulfates instead of alkali chlorides. Therefore, fuel blends under consideration can be denoted to have low-fouling propensity.


Investigation of combustion characteristics of biomass and coal mixtures in a circulating fluidized bed combustor
Varol, Murat; Atımtay, Ayse; Department of Environmental Engineering (2013)
In this study, combustion and co-combustion tests of Bursa/Orhaneli lignite with two biomass fuels (olive cake and woodchips) were carried out in a laboratory scale Circulating Fluidized Bed (CFB) combustor, 6 m high and 108 mm inside diameter, in order to investigate the effect of excess air ratio (l), secondary air ratio (SAR) and location of secondary air injection along the combustor wall on the emissions. Optimum l and SAR was determined for each test. The flue gas emissions were compared with limits i...
Investigation of fly ash characteristics on zeolite 4A synthesis
Akın, Süleyman Şener; Kazanç Özerinç, Feyza; Department of Micro and Nanotechnology (2019)
There is lack of information about the relation between the candidate raw material fly ash and end product, Zeolite 4A.This study aims to fill the gap in the literature through controlled ash production experiments, characterization studies and Zeolite 4A synthesis. As a result of studies, the nucleation behaviour of the alkali fusion product obtained from fly ash was demonstrated and the most crystalline Zeolite 4A with cubic morphology were obtained from Seyitömer fly ash with alkali fusion product of Si/...
Development of high-volume low-lime and high-lime fly-ash-incorporated self-consolidating concrete
Sahmaran, M.; Yaman, Oe.; Tokyay, Mustafa (2007-03-01)
The current article presents an experimental study on the use of two types of fly ash ( low lime and high lime) as mineral admixtures in producing self-consolidating concrete (SCC) with the objective of assessing the effects of both types of fly ash on the fresh and hardened properties of SCCs. Within the scope of an experimental programme, SCCs were prepared by keeping the total mass of cementitious materials constant at 500 kg/m(3), in which 30, 40, 50, 60 or 70% of cement, by mass, was replaced by high-l...
Evaluation of effect of sulfate on class c fly ash and lime stabilized expansive soil
As, Mehme; Çokça, Erdal; Department of Civil Engineering (2019)
In this study, effect of sulfate on expansive soil treated with Class C Fly Ash was investigated. Also, lime was used for comparison purposes. The swelling soil was prepared at laboratory environment by mixing kaolinite and bentonite. Class C Fly Ashes obtained from Soma and Sivas-Kangal Thermal Power Plants were used as main additives for stabilization. Na2SO4 and CaSO4.2H2O were used as sulfate sources with different concentrations (3000ppm to 40000ppm). Optimum fly ash content was chosen as 15% and 10% f...
Effect of limestone addition on radiative heat transfer during co-firing of high-sulfur content lignite with biomass in fluidized bed combustors
Ates, CİHAN; Selçuk, Nevin; Külah, Görkem (2018-01-01)
In this study, influence of limestone addition on radiative heat transfer during co-firing of high-sulfur content lignite with olive residue in the freeboard of 300 kW(t) Atmospheric Bubbling Fluidized Bed Combustor (ABFBC) is investigated by using an in-house developed radiation code based on Method of Lines (MOL) solution of Discrete Ordinates Method (DOM). The freeboard is treated as a 3D rectangular enclosure containing gray, absorbing, emitting gas with absorbing, emitting, anisotropically scattering p...
Citation Formats
Z. Gogebakan, Y. Gogebakan, N. Selçuk, and E. Seliuk, “Investigation of ash deposition in a pilot-scale fluidized bed combustor co-firing biomass with lignite,” BIORESOURCE TECHNOLOGY, pp. 1033–1036, 2009, Accessed: 00, 2020. [Online]. Available: