Energy recovery 3: Modern grate combustorspanos/444/1.9.2.WtE.pdfFlue gas treatment line...
Transcript of Energy recovery 3: Modern grate combustorspanos/444/1.9.2.WtE.pdfFlue gas treatment line...
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Sustainable Waste Management AIT Athens, Greece - 18-22 June 2012
Energy recovery
3: Modern grate combustors
prof. Stefano Consonni Department of Energy, Politecnico di Milano
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A conventional modern
Waste-to-Energy plant
with grate combustion
Graphics from MARTIN Gmbh
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Receiving area
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Receiving area
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Bunker
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Bunker
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Crane
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Crane
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Crane
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Feed hopper
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Feed hopper
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Feed hopper
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Grate
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Grate
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Grate
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Grate
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Grate
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Boiler
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Boiler
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Boiler
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Boiler
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Flue gas
treatment line
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Flue gas
treatment line Electro-Static
Precipitator (ESP), captures (large)
particulate matter (fly ash)
Injection of sodium bicarbonate or calcium (lime),
removes acid gases. Injection of activated carbon, removes micro-pollutants (dioxins,
heavy metals).
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Flue gas
treatment line Reactor warrants adequate contact
time between reactants and acid
gases
Fabric filter (or scrubber) removes remaining fly ash and products of acid gas
treatment
De-NOX SCR system (catalytic reactor) with injection of ammonia
or urea reduces nitrogen oxides
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Stack
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Stack