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SUMMARY:Chemical Looping Combustion: One Technology for the Clean Utilisat
 ion of Coal - Dr John S Dennis - Reader in Chemical Reaction Engineering\,
  University of Cambridge
DTSTART:20100224T170000Z
DTEND:20100224T180000Z
UID:TALK22680@talks.cam.ac.uk
CONTACT:David Leal-Ayala
DESCRIPTION:Coal is used for around 39% of global production of electricit
 y. Despite being one of the most polluting fossil fuels\, in terms of mass
  of CO2 emitted per unit of power generated\, the use of coal is projected
  to increase from present day levels by ~ 80% by 2030. It is\, therefore\,
  imperative to find ways of using it for power generation whilst avoiding 
 the release of CO2 into the atmosphere. The currently-available technology
  for CO2 separation is by scrubbing the flue gases with\, e.g. monoethylam
 ine (MEA): however\, this technique comes with a large energy penalty beca
 use of the large heat requirement for regeneration of the solvent\, reduci
 ng the efficiency of the power plant by up to one-third.\n\nChemical-loopi
 ng combustion (CLC) has the inherent property of separating CO2 from flue 
 gases without the energy penalty associated with amine scrubbing. Instead 
 of air\, it uses an oxygen-carrier\, usually in the form of a metal oxide\
 , to provide oxygen for combustion. This presentation will deal with the a
 pplication of chemical looping to the combustion of solid fossil fuels and
  will highlight research being undertaken on this topic. Further work on a
  modification of chemical looping will be described\, involving the oxides
  of iron in packed bed reactors\, to produce hydrogen of high purity from 
 low-grade synthesis gas. This offers substantial benefits in terms of the 
 distributed production of hydrogen\, avoiding costly transport of the gas 
 by a dedicated grid.\n\nJohn Dennis was a Lecturer in the Department of Ch
 emical Engineering from 1984 to 1989 having previously been an undergradua
 te and PhD student there. During this period he published on the control o
 f sulphur emissions from fluidised bed combustors and on the problems of g
 as combustion in fluidised beds. He left Cambridge to become an engineerin
 g consultant in 1989 specialising in the solution of difficult process or 
 economic problems\, with areas of technical interest including heat and ma
 ss transfer in reactors\, combustion\, and fluidised bed reactions. He has
  had close involvement with collaborative research involving academia and 
 industry. He returned to the University and was a University Lecturer from
  1st October\, 2002\, Senior Lecturer from 1st October\, 2004 and Reader i
 n Chemical Reaction Engineering from 1st October\, 2008. Recent areas of r
 esearch include the fluidised bed gasification of biomass\, fundamental st
 udies of fluidised bed hydrodynamics using MRI\, discrete element modellin
 g of fluidised beds\, clean coal technology using chemical looping and oth
 er techniques\, and\, as a separate area\, the use of microalgae for biofu
 els.
LOCATION:LT2\, Engineering Department\, Inglis Building
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