Sökning: "chemical looping gasification"

Visar resultat 1 - 5 av 20 avhandlingar innehållade orden chemical looping gasification.

1. 1. Behavior of iron-based oxygen carriers at deep reduction states

   Författare :Victor Purnomo; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; oxygen carrier; fuel conversion; chemical looping; physical performance; deep reduction; reactivity; iron oxides;

   Sammanfattning : Oxygen carriers have an important role as bed materials in both common circulating fluidized bed combustion unit (also known as oxygen-carrier-aided combustion, OCAC) and in various chemical looping processes. Contrary to conventional bed materials, e.g., sand, oxygen carriers are capable of transferring both oxygen and heat. LÄS MER

3. 2. Chemical-Looping Combustion with Solid Fuels

   Författare :Henrik Leion; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; petroleum coke; fluidized bed; oxygen carrier; ilmenite; volatiles; gasification; sulphur dioxide; coal; iron oxide; chemical looping combustion; CLC;

   Sammanfattning : In order to meet the global demand of CO2 neutral energy production, chemical-looping combustion could play an important role. With this technique it is possible to capture CO2 without an excessive energy penalty. LÄS MER

4. 3. Manganese ores as oxygen carriers for chemical-looping combustion

   Författare :Sebastian Sundqvist; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical-looping with oxygen uncoupling; gaseous fuel; methane; syngas; Chemical-looping combustion; manganese ores; combined oxides; wood char and solid fuels;

   Sammanfattning : Chemical looping combustion (CLC) is a fluidized bed system that circulates metal oxide particles in order to transport oxygen from an air reactor to a fuel reactor. In the fuel reactor a fuel reduces the oxygen carrier while producing CO2 and H2O. The oxygen carrier is then transported back to the air reactor and reoxidized. LÄS MER

5. 4. Design and Operation of a 10 kWth Chemical-Looping Combustor for Solid Fuels

   Författare :Nicolas Berguerand; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Interconnected Fluidized Beds; Oxygen Carrier; Chemical-Looping Combustion; Carbon Dioxide Capture; Solid Fuel Conversion;

   Sammanfattning : The use of a 10 kWth chemical-looping combustor for solid fuels was investigated. The unit was designed, dimensioned and built and two types of fuel were tested: a South African coal and a petroleum coke from Mexico. Chemical-looping combustion is an alternative to normal combustion for CO2 capture. LÄS MER

7. 5. Novel Metal Oxide Bed Materials for Efficient Solid Fuel Gasification and Gas Clean-up in Fluidized Beds

   Författare :Martin Keller; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hot Gas Clean-up; Gasification; Dual Fluidized Bed; Chemical Looping Reforming; Chemical Looping Combustion; Tar reforming;

   Sammanfattning : In this work the utilization of some novel metal oxide bed materials in dual-fluidized bed gasification systems has been investigated. For this purpose, metal oxide based bed materials can be 1) directly utilized in the dual fluidized bed gasifier (DFB) or in the Chemical Looping Combustion (CLC) process in order to achieve higher gasification rates, or 2) employed in downstream hot gas conditioning processes, e. LÄS MER