to read the full report - Ecolateral by Peter Jones
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Evaluation of Opportunities for Converting Indigenous UK Wastes <strong>to</strong> Wastes and Energy<br />
AEA/ED45551/Issue 1<br />
and combustible material produced from <strong>the</strong> gasifier are burnt <strong>to</strong>ge<strong>the</strong>r in a cyclonic ash melting chamber<br />
at temperatures between 1350-1450ºC <strong>by</strong> <strong>the</strong> addition of secondary air. The particles are <strong>the</strong>n collected<br />
on <strong>the</strong> walls, where <strong>the</strong>y are vitrified and proceed slowly through <strong>the</strong> furnace.<br />
The good quality recovered metal components are sold in<strong>to</strong> <strong>the</strong> metal markets. The molten glass<br />
products fulfil <strong>the</strong> stringent Japanese soil standard and are sold <strong>to</strong> <strong>the</strong> construction industry. The energy<br />
content of <strong>the</strong> shredder residue is converted <strong>to</strong> electricity and sold <strong>to</strong> <strong>the</strong> grid.<br />
There are numerous TwinRec Fluidized Bed and Gasification facilities in Japan. Several examples are:<br />
• Ube City plant has a capacity of 8.3 <strong>to</strong>nnes per hour over three process lines and has been<br />
commercial operation since 2003. The electricity output of <strong>the</strong> plant in is 4MW. 291<br />
• Seki City plant has a capacity of 7 <strong>to</strong>nnes per hour, in commercial operation since 2003, with an<br />
electricity output.<br />
• Recently, <strong>the</strong> Kawaguchi plant was started, treating 18 <strong>to</strong>nnes per hour of municipal solid waste<br />
in three process lines (3 x 21 MW).<br />
Foster Wheeler, Lahti, Finland<br />
Lahti is a small <strong>to</strong>wn <strong>to</strong> <strong>the</strong> north of Helsinki. The <strong>to</strong>wn authority operates a 350MWth coal and natural<br />
gas fired CHP installation that provides electricity and district heating for <strong>the</strong> <strong>to</strong>wn. A 50MWth fuel-gas<br />
burner, supplied <strong>by</strong> a circulating fluid bed gasifier (see Figure 20), has been installed in place of one of<br />
<strong>the</strong> pulverised coal burners. A wide range of shredded fuels have been used with considerable success.<br />
Typical fuels are sorted domestic waste, tyres and plastic bottles, sleepers, debarker residues and<br />
sawdust. The feeds<strong>to</strong>ck is blended in an ‘A’ frame s<strong>to</strong>rage building with a traversing screw discharge.<br />
No gas clean up is used, acid gas emissions are controlled <strong>by</strong> source separation of <strong>the</strong> feeds<strong>to</strong>ck and<br />
dust from <strong>the</strong> gasifier is carried forward in<strong>to</strong> coal fired boiler and mixes with <strong>the</strong> coal ash.<br />
A detailed case study for this installation and a similar installation at Zeltweg in Austria have been<br />
prepared <strong>by</strong> <strong>the</strong> IEA Thermal Treatment of Waste Task.<br />
291 Ube, Japan, Plant Sheet, http://www.ebara.ch/downloads/ebara_plant_sheet_ube_twinrec.pdf<br />
157