Products of incineration sifting fine material include ash, metal fragments, glass, unburnt...
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![Page 1: Products of incineration sifting fine material include ash, metal fragments, glass, unburnt organic substances etc.. residue all solid material.](https://reader035.fdocuments.net/reader035/viewer/2022062408/56649eb15503460f94bb7b5d/html5/thumbnails/1.jpg)
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Products of incineration
sifting
fine material include ash, metal fragments, glass, unburnt organic substances etc..
residue
all solid material that are left after incineration
remove continuously or in batches
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clinker and fly ash
10% is the fused ashes, etc.. is use as component of cement, concrete or road making.
the fly ash comes from the gas scrubbing unit
the quantity of fly ash usually 12 – 15 kg/tonne of refuse
also used in cement making, concrete, brick and road making
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suspended particulates
flue gas
vented air emitted from a chimney after combustion in burner. It can include nitrogen oxides, carbon dioxides, water vapor, sulfur dioxides, particles and many chemical pollutants
(FSL)
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the equipments used to remove are:
the fabric filter – almost 100% efficiency
electronic precipitations -96 – 100% efficiency
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wet scrubbers – 94 – 97%
cyclones – 60 – 65%
settling chamber – 10 – 30%
wetted baffle spray – 10 – 53%
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waste gas
removed via the stack
the high and diameter depends amount of climatic and lanscaping of the area
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heavy metal
found in the stack gas, bottom ash, filter dust or in salt and sludges from dust cleaning
the heavy metal are:
Cd, Cl, Cr, Cu, F, Pb, Hg, Ni, S and Zn.
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Fraction %
Stack gas %
Bottom ash %
Filter dust %
Salt and sludges from gas cleaning %
Cadmium 0.04 11 85 3.6
Chlorine 0.12 9 15 76
Chromium 0.01 94 5.8 0.27
Copper 0.01 95 4.9 0.53
Fluorine 1.5 69 3.0 26
Lead 0.01 75 24 0.9
Mercury 2.1 7 5.1 86
Nickel 0.04 87 13 0.61
Sulphur 0.47 50 10 40
Zinc 0.05 49 51 0.7
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Acid Gas
SO2, HCL and HF can be remove by three methods
wet method Dry method semi dry method
Wet method
Pollutions are removed by large quantities of slaked lime or aqueous sodium hydroxide in Ventury scrubbing system
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The limestone mixed by two ways:
with the waste before incineration
introduce separately into the furnace
Semi dry method
used a spray of lime (CaO) mixed with water into the flue gas flow
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Organic pollutant – high level of toxicity
Persistence in the environment
The emission of dioxin can be control with further treated of flue gas by;
adsorption onto activated carbon filters
catalyst uses:
mix metal oxide catalyst
destroy the dioxin by reaction with O2
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NOx controlled by in fluidised bed incinerator by controlling the amount of air inlet to the cobustion process
Where NOx production cannot be prevented, it is remove by the injection of urea or ammonia into the flue gas.
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Advantages of incineration
incineration is sanitary, odourless and dustless
residue only 20% of the original weight and can be used for making cement and other materials for construction industry
require very little space and very few personnel
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can be located centrally even within the town and reducing transportation costs.
energy production and other by-product could generated revenue
ash and other residue are pathogen-free
pre sorting and recycle could be incorporated and this reduces the volume to be incinerated
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Disadvantages of incineration
high capital cost and high operating cost
take time to plan, design construction
require skill personnel
disposal of ash require landfill
may cause air pollution and long term environmental effect
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