Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Investigation of Turkish lignites and biomass at high heating rates by using wire mesh apparatus
Download
index.pdf
Date
2018
Author
Baghirzade, Mammadbaghir
Metadata
Show full item record
Item Usage Stats
229
views
248
downloads
Cite This
Coal continues to play a significant role in energy production over the world. However, its limited procurement and enormous side effects on global warming, make governments and organizations turn towards renewable energy resources like biomass which is CO2 neutral. Prior to utilization of fuels in power plants, it is important to investigate fuel behavior at high temperatures and high heating rates, i.e., close to heating rates in industrial applications. This understanding enables engineers to design appropriate and efficient boilers. However, until now, Turkish fuels have not been analyzed under high heating rate and high temperature conditions in laboratory settings to resemble the actual pulverized fuel combustion boilers. Therefore, in this study, combustion behavior of Turkish lignite and biomass fuels were studied in a laboratory environment close to the real conditions available in commercial power plants (i.e. pulverized fuel boilers). This work performed combustion and fast pyrolysis of Turkish biomass and lignite fuels, namely hazelnut shell (HS), olive residue (OR) and Soma lignite (SL) at high heating rates (~3000 ºC/s) in a novel wire mesh reactor (WMR). Particular emphasis was given to understand ash and char yields, their morphology and chemical composition, volatile yield, char reactivity of the chars obtained at high heating rates (~2200 ºC/s, 4550 ºC/s) and at elevated temperatures (~1100 ºC, 1500 ºC). In order to understand effect of moisture on fast pyrolysis conditions, dried and as received hazelnut shell fuels were pyrolyzed at two different temperatures, 1100 ºC and 1550 ºC, at heating rates of 2200 ºC/s and 4550 ºC/s respectively. Volatile yields from dried and as received HS chars obtained from both pyrolysis conditions, showed higher values nearly 85 wt.% than proximate analysis (PA) (HS-A: 75 wt. %, HS-D: 79.5 wt.%) performed at low heating rates (20 ºC/min). To investigate synergetic effect of co-pyrolysis of coal and biomass, two different blends of Soma lignite (SL) and hazelnut shell (HS) with mixing ratios of 50-50 wt.% and 75-25 wt.% were pyrolyzed. Thermogravimetric analysis (TGA) was conducted to carry out isothermal char combustion to study reactivity of individual and blended chars. In order to have kinetically controlled combustion environment in TGA, 400 º C for biomass chars, 450 º C for lignite and blended chars were decided as isothermal combustion temperatures. Individual hazelnut shell chars showed higher reactivity than individual lignite and blended chars and, therefore, shorter 90% burnout time (9.6 min) was observed for hazelnut shell chars compared to lignite (342 min) and blended chars (~160 min). Brunauer–Emmitt–Teller (BET) surface analysis was performed to determine surface areas of individual and blended chars obtained from high heating rate pyrolysis in WMR. Biomass chars were characterized by low surface areas (10-15 m2/g) due to rapid volatilization phenomenon at high heating rates.
Subject Keywords
Lignite.
,
Biomass.
,
Pyrolysis.
,
Wire netting.
URI
http://etd.lib.metu.edu.tr/upload/12622440/index.pdf
https://hdl.handle.net/11511/27580
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
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...
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...
Overcoming problems in Turkey's renewable energy policy: How can EU contribute?
Sirin, Selahattin Murat; Ege, Aylin (2012-09-01)
Fossil fuels cover most of the energy demand in the world, and this creates significant social, economic and environmental problems. Many countries have taken measures to increase the share of renewable energy sources (RES), especially in electricity generation, and the review of literature shows that the success of a country in RES diffusion depends on a comprehensive renewable energy policy which combines political commitment with stable and long-term support measures that stimulate technological innovati...
INVESTIGATION AND MODIFICATION OF HYDROKINETIC SAVONIUS TURBINE FOR LOW WATER SPEEDS
Ike-Offiah , Chiedozie Augustine; Orang, Ali Atashbar; Oğuz, Elif; Sustainable Environment and Energy Systems (2022-11)
With the ever-growing global interest in reducing greenhouse gases such as CO2, renewable energy options present a good energy alternative. Not only are they a sustainable option in their operational period, but they also have a low implementation cost especially, when compared to conventional fossil fuel sources. Hydrokinetic turbines have the advantages of energy predictability, relatively low visual impact, a high energy density, high capacity factor, and ease of manufacture, in addition to the low cost ...
Optimization of process parameters in oxygen enriched combustion of biocoal and soma lignite blends by response surface methodology
Keivani, Babak; OLGUN, HAYATİ; Atımtay, Aysel (2022-01-01)
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 ...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
M. Baghirzade, “Investigation of Turkish lignites and biomass at high heating rates by using wire mesh apparatus,” M.S. - Master of Science, Middle East Technical University, 2018.