Search for dissertations about: "ash transformation"

Showing result 21 - 25 of 35 swedish dissertations containing the words ash transformation.

  2. 21. Chemical Transformation of Inorganic Species in Thermochemical Conversion of Waste-Derived Fuels - The Role of Oxygen Carriers

    Author : Ivana Stanicic; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; oxygen carriers; Waste-derived fuels; thermodynamic equilibrium calculations; heavy metals; chemical looping;

    Abstract : Waste-derived fuels are used increasingly in heat and power production systems in Sweden. Thermal conversion of waste-derived and biomass fuels offers the possibility of achieving carbon dioxide-neutral or even negative emissions. To limit global warming, it is essential to integrate these systems with carbon capture and storage. READ MORE

  4. 22. Transformation and Release of Potassium, Chlorine, and Sulfur from Biomass under Conditions Relevant to Dual Fluidized Bed Gasification

    Author : Placid Tchoffor Atongka; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cl; release of K; Char gasification; and S;

    Abstract : The transformation and release of ash-forming elements during thermal conversion of biomass areconducive to ash-related problems, for example, agglomeration of bed material in fluidized beds. Theoccurrence and severity of these problems largely depend on the extent to which K, Cl, and S arereleased from biomass during thermal conversion processes. READ MORE

  5. 23. Lignocellulosic residues for bioenergy : effects of storage, fuel design, and combustion characteristics

    Author : Marjan Bozaghian; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Utilization of lignocellulosic residues for bioenergy raises storage, handling, and combustion challenges. The ash-forming elements in biomass may cause ash-related problems during combustion, such as slagging, fouling, corrosion, or bed agglomeration. Most of these problems are linked to ash-chemical reactions involving alkali. READ MORE

  6. 24. Effect of fuel composition and combustion conditions on phosphorus behavior during combustion of biomass

    Author : Joel Falk; Marcus Öhman; Anita Petterson; Luleå tekniska universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energiteknik; Energy Engineering;

    Abstract : Due to concerns for climate change and future supply of phosphorus fertilizer within agriculture, there has been an increased interest in the combustion of phosphorus containing waste residues and opportunity biomass fuels. Previous research has shown that during combustion, phosphorus has large impact on ash transformation reactions and may decrease or increase ash-related problems such as slag formation and bed agglomeration. READ MORE

  7. 25. Cadmium Distribution and Speciation by Synchrotron Radiation Induced X-Ray Microprobe Techniques Application to Municipal Solid Waste and Biomass Fly Ashes

    Author : Caterina Camerani Pinzani; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; leaching; speciation; MSW; biomass; affinity; synchrotron radiation based micro-probe techniques; Ca-containing matrices; cadmium; fly ashes;

    Abstract : During the last few years, alternative fuels, such as wood and Municipal Solid Waste (MSW), are increasingly being used in Sweden for heat and power production. The positive environmental impact in terms of low sulphur emissions, no net emission of CO2 to the atmosphere, and local availability are main driving forces in this development. READ MORE