Sökning: "Solid Fuel Conversion"

Visar resultat 1 - 5 av 102 avhandlingar innehållade orden Solid Fuel Conversion.

1. 1. Solid Fuel Conversion in Dual Fluidized Bed Gasification - Modelling and Experiments

   Författare :Louise Lundberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dual fluidized bed gasification; fuel mixing; biomass; semi-empirical modelling; char gasification rate; fuel conversion; active bed material; char reactivity;

   Sammanfattning : Dual fluidized bed gasification (DFBG) is the initial step towards the transformation of ligno-cellulosic materials into a raw gas, which can be further upgraded into transportation fuels, such as substitute natural gas, Fischer-Tropsch diesel, dimethyl ether, and methanol. DFBG units can be operated in two distinctly different ways, depending on whether the main product is a gas (to be refined into a transportation fuel) or heat and power (with gas as a by-product). LÄS MER

3. 2. Principles and Models of Solid Fuel Combustion

   Författare :Henrik Thunman; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wood; single particle; modelling; fluidized bed; thermochemical conversion; fixed bed; coal; thermal conductivity; fuel loading; measurements; thermochemical properties; biofuels; combustion; grate;

   Sammanfattning : Combustion of solid fuels stands for a substantial part of the heat and power production in the world. In this thesis different aspects related to the thermochemical conversion of solid fuels in fluidized and fixed beds are treated, such as: the combustion temperature of a fuel particle related to the surrounding temperature in a fluidized bed combustor (FBC); the fuel loading in a FBC; a transient description of the conversion of non-spherical fuel particles; the thermochemical properties and composition of volatiles released from wood; the thermal conductivity of wood during different stages of conversion; the modelling of a grate furnace; the general combustion behaviour of a fixed bed on a reciprocating or a travelling grate; and finally, the design and construction of experimental units for investigation of combustion in a fixed bed. LÄS MER

4. 3. A new measurement method to analyse the thermochemical conversion of solid fuels

   Författare :Rasmus Friberg; KTH; []
   Nyckelord :Packed-bed combusion; thermochemical conversion of biomass; solid-fuel combusion; fuel-bed combusion; gate combusion; biomass combusion; gasification. Pyrolysis; drying;

   Sammanfattning : The firing of fuel wood has been identified as one of themain causes of pollutant emissions from small-scale (.... 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; Solid Fuel Conversion; Chemical-Looping Combustion; Oxygen Carrier; Ilmenite; Carbon Dioxide Capture; Oxygen Transfer; Gas Conversion; Oxygen Demand;

   Sammanfattning : Chemical-looping combustion (CLC) is a new fuel conversion technology with inherent CO2 capture. In this process, the fuel and the combustion air are never mixed and the oxygen is transferred to the fuel via an oxygen carrier in the form of a metal oxide circulating between two reactors, e.g. LÄS MER

7. 5. Investigation of Solid Fuel Conversion in a Fluidised Bed Gasifier – Modelling and Experiments

   Författare :Louise Lundberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; modelling; biomass; char reactivity; gasification; char conversion; fluidised bed;

   Sammanfattning : A substantial proportion of Sweden’s greenhouse gas emissions originates from the transportation sector, and the Swedish government has set the goal that the entire Swedish vehicle fleet will be independent from fossil fuels by 2030. One of the strategies investigated to achieve this goal is biomass gasification, which is a technology that can be used to transform lignocellulosic materials into a raw gas. LÄS MER