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İstanbul Teknik Üniversitesi / Fen Bilimleri Enstitüsü / Kimya Mühendisliği Anabilim Dalı

Afşin Elbistan linyit kömürü ve RDF'den üretilen yarıkok karışımlarının yanma davranımlarının belirlenmesi

Determination combustion behavior of chars produced from Afsin Elbistan lignite coal and RDF

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Özet:

Ülkemizde artan enerji ihtiyacı ve petrol, doğalgaz rezervlerinin kısıtlı oluşu buna karşı linyit kömürünün rezervlerinin fazla olmasından dolayı, gelecekte linyit kömürünün öneminin daha da artacağı öngörülmektedir Ülkemizde kaliteli linyitlerden nem, kül ve kükürt içeriği yüksek, ısıl değeri düşük olan kalitesiz linyitlere kadar çok çeşitli kömürler bulunmaktadır Ancak, düşük kaliteli linyitlerin toplam rezerv içindeki payı oldukça yüksektir Uygun koşulların sağlanamadığı yakma sistemlerinin kullanılması, kömürden enerji üretim verimini önemli ölçüde düşürmekte ve çevre kirliliğine neden olmaktadır Bu çerçevede, düşük kaliteli linyit potansiyelinin değerlendirilmesi için uygun teknolojilerin geliştirilmesi, ülkemizin öncelikli enerji politikaları arasında yer almaktadır RDF; evsel, ticari veya endüstri proseslerinden çıkan tehlikeli ve tehlikesiz atıkların, geri kazanılabilen malzemeleri (cam, plastik, metal vb ) ayrıştırıldıktan sonra geriye kalan yanabilir özelliğe sahip geri dönüşümsüz malzemeden türetilen alternatif katı yakıttır Ülkemiz biyokütle potansiyeli içinde RDF'nin payı oldukça yüksektir ...

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Summary:

The big part of the world energy requirement, which increases in parallel with population and industrialization, is provided from fossil fuels The difference between energy supply and consumption in our country increases every year and accordingly, our foreign dependence on energy in terms of sources increases as well Today, issues which are dealing with the environmental pollution resulting from production and consumption of fossil fuels and restricted reserves of fossil resources are the most important problems Coal which is a kind of sedimentary rock has a very important share of world energy production Also, coal is the most important energy source of Turkey and most of the Turkish coal's are low quality lignites having high ash, sulfur, moisture content and low heating value The amount of low quality lignites inthe total lignite reserves is extremely high Using inconvenient combustion systems causes significant reduction in the efficiency of energy production from coal and also environmental pollution Coal burning is a major contributor to global warming Thus, the development of appropriate technologies for the evaluation of low-quality lignite potential must be one of the most important energy policy of our country Electricity generation using coal burning produces approximately twice the greenhouse gasses per kilowatt compared to generation using natural gas Refuse-Derived Fuel (RDF) is a kind of alternative solid fuel that is obtained by proper methods out of domestic waste, industrial waste and toxic waste, and has calorific value Recycling waste, reuse of waste and use of those that have calorific value allows significant decrease in the waste amount that will be sent for storage, and such practice enables a management that complies with the strategy developed by European Union in the subject of waste management RDF production and use needs to be reformed and standardized within this scope Refuse-derived fuel typically consists of pelletized or fluffy MSW that remains after the removal of noncombustible materials such as ferrous materials, glass, grit, and other noncombustible materials The remaining material is then called RDF Energy production through the direct combustion of coal and RDF is the oldest known method In recent years, combustion systems for burning coal-RDF blends together, are being developed Energy production from coal and RDF is widely provided by combustion Co-combustion of coal and RDF blends gains more importance in terms of the utilization of low quality coals and RDF economically and reducing the total pollutant emissions Investigation of the combustion behaviour and combustion kinetics of coal-RDF blends is essential for the modelling, design and operation of the combustion systems at industrial scale Co-combustion means simultaneous combustion of two or more fuels in the same plant for energy production Although this mode of combustion has been applied for many years, the interest has been enhanced recently Co-combustion can be carried out in various ways for various purposes A coarse classification could be as follows, covering new plants as well as existing ones converted for the purpose First, a small amount (a few percent of total fuel power) of biofuel or waste is fired together with coal in a boiler, originally designed for coal Turkey's large lignite reserves and agricultural wastes, which are important with regard to reduce our energy dependency, are widely evaluated by burning together In this study, instead of the raw coal and RDF, coal and RDF char, which have higher calorific values are burned together Various governments worldwide are beginning to put regulations in place and to encourage development of more sustainable sources of power generation in order to protect populations worldwide from the immediate harmful effects on life and health, and to protect the environment for future generation RDF is appeared to be an important feedstock for three main reasons First, it is a renewable resource that could be sustainably developed in the future Second, it appears to have formidably positive environmental properties, reduced greenhouse gas (GHG) emissions, possibly reduced NOx and SOx depending on the fossil fuels displaced However, it also has negative impacts, such as emissions of polycyclic aromatic hydrocarbons including polycyclic aromatic hydrocarbons, dioxins, furans, volatile organic compounds and heavy metals especially when combusted in traditional stoves The purpose is to get rid of waste or to replace coal by RDF utilisation Second, a small amount of fuel with a high heating value is fired together with a fuel having a low heating value that needs thermal support to attain a desired combustion temperature Third, spontaneous use of co-combustion with fuels in any ratio, depending on price, availability and local supply conditions The first type is of greatest significance due to its potential ability to reduce the consumption of coal, thereby decreasing the emissions of greenhouse gases It is of interest to assess the possibility and reliability of such utilisation of RDF and waste in a plant designed for the base fuel (normally coal) Secondly, addition of high-value fuel to a low-value one, or in general terms, combination of any fuels with different properties, may have useful secondary consequences, such as reduction of emissions or improving reliability of operation Coal and RDF are quite different in composition Co-firing RDF with coal has the capability to reduce both NOx and SOx levels from existing pulverized coal fired power plants ...

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