Sökning: "Combustion chemistry"

Visar resultat 1 - 5 av 207 avhandlingar innehållade orden Combustion chemistry.

  1. 1. Ash chemistry and fuel design focusing on combustion of phosphorus-rich biomass

    Författare :Nils Skoglund; Dan Boström; Rainer Backman; Franz Winter; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; phosphorus; biomass; combustion; ash chemistry; fuel design; ash transformation; phosphorus-rich; ash-forming elements; fuel fingerprint; ash transformation reactions; Lewis base; Lewis acid; oorganisk kemi; Inorganic Chemistry;

    Sammanfattning : Biomass is increasingly used as a feedstock in global energy production. This may present operational challenges in energy conversion processes which are related to the inorganic content of these biomasses. As a larger variety of biomass is used the need for a basic understanding of ash transformation reactions becomes increasingly important. LÄS MER

  3. 2. Fate of Trace Elements in Thermochemical Conversion of Waste Fuels Using Oxygen Carriers

    Författare :Ivana Stanicic; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Oxygen Carrier Aided Combustion; X-ray Photoelectron Spectroscopy; Ash interaction; Chemical Looping Technologies; Thermodynamic Calculations; Waste; Oxygen Carriers; Ilmenite; Trace Elements;

    Sammanfattning : The metals zinc, copper and lead are amongst the more abundant trace elements in waste fuels. The fate of these elements is important to study because they can affect the thermochemical conversion process and end up in ashes. LÄS MER

  4. 3. Experimental and quantum-chemical studies of the surface interactions between organic molecules and nanocrystals of (a) RE2O3 (RE = Y or Gd); and (b) TiOb2

    Författare :Henrik Pedersen; Per-Olov Käll; Lars-Johan Norrby; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Inorganic chemistry; Oorganisk kemi; Physical chemistry; Fysikalisk kemi;

    Sammanfattning : The increasing interest for using nanocrystals in bio-medical and optical applications has highlighted the need of molecular functionalisation of nanocrystals. Knowledge of how to attach molecules to the nanocrystal surface is a key factor. LÄS MER

  5. 4. Combustion Valve Wear : A Tribological Study of Combustion Valve Sealing Interfaces

    Författare :Peter Forsberg; Staffan Jacobson; Rob Dwyer-Joyce; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Combustion valves; wear; tribofilm; test rig; combustion residue; Teknisk fysik med inriktning mot tribomaterial; Engineering Science with specialization in Tribo Materials;

    Sammanfattning : The exhaust valve system of combustion engines experiences a very complex contact situation of frequent impact involving micro sliding, high and varying temperatures, complex exhaust gas chemistry and possible particulates, etc. In addition, the tribological situation in the exhaust valve system is expected to become even worse due to strict future emission regulations, which will require enhanced combustion and cleaner fuels. LÄS MER

  7. 5. Structural and solid state EMF studies of phases in the CaO–K2O–P2O5 system with relevance for biomass combustion

    Författare :Malin Sandström; Dan Boström; Anders Nordin; Bo Björkman; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; calcium potassium phosphates; structural studies; Gibbs standard energy of formation; EMF measurements; biomass; combustion; chemical equilibrium model calculations; Inorganic chemistry; Oorganisk kemi;

    Sammanfattning : Fosfaters reaktioner i energiomvandlingsprocesser är kritisk för den generella processen som helhet, för askrelaterade problem, emissioner liksom för en effektiv och hållbar användning av askan.Denna avhandling är en sammanställning och diskussion med utgångspunkt i åtta artiklar som behandlar strukturella och termodynamiska studier på faser i CaO-K2O-P2O5-systemet, vilka är av relevans inom förbränning av biomassa. LÄS MER