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“HICLEAN
- DX”
Next-Generation
Technology for Removing Dioxin from Fly Ash |
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| HICLEAN-DX is JFE’s
new volatilization and decomposition technology
for removing dioxin from fly ash. The technology
volatilizes dioxin and organic compounds at temperatures
above 400°C, and efficiently decomposes them
using a high-performance oxidation catalyst. |
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| Less
than 0.1ng-TEQ of dioxin per gram of fly ash |
| More than 60 percent
of all dioxin emissions from incinerators are discharged
with fly ash. JFE’s technology reduces the
amount of dioxin in the fly ash to below 0.1ng-TEQ
per gram of fly ash. As a result, not only is the
total amount of dioxin released from the incinerator
significantly reduced, the technology complies with
stringent new regulations for total emissions. |
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| Ideal
technology to remove dioxin from fly ash |
| Dioxin and organic compounds
adsorbed by or attached to the fly ash are heated,
volatilized and separated from the fly ash by JFE’s
new technology. The treated ash does not contain
organic compounds that can result in dioxin. |
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| Decomposition
of volatilized dioxin into water and carbon dioxide |
| The dioxin and organic
compounds volatilized from the fly ash and transferred
into gas emissions are decomposed with an oxidative
process into nontoxic water and carbon dioxide using
a highly efficient catalyst. |
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HICLEAN-DX
vs. current technology |
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 System
features |
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| Agitating
fluidized-bed heating chamber realizes high heating
efficiency |
| Conventional processes
have difficulty heating fly ash to above 400°C,
the temperature required to reduce dioxin. This
is due to the poor heat conductivity of fly ash,
as well as the solidification and agglomeration
of chlorides if the fly ash is overheated. JFE eliminated
this problem with an agitating fluidized-bed heating
chamber, which offers very high heating efficiency
for use with HICLEAN-DX. |
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 High
heating efficiency |
| The new technology does
not require excessive heating, due to excellent
heat transfer on the heating surface. A stable temperature
in the fluidized bed is maintained, resulting in
uniform processing. In addition, highly efficient
contact between the heated air and fly ash enhances
volatilization. |
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| No
agglomeration of fly ash |
| Since the heating surface
does not have to be heated to an excessively high
temperature, fly ash does not solidify or agglomerate. |
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| Smaller
heating chamber |
| Thanks to the technology’s
enhanced heating efficiency, the size of heating
chamber could be reduced. Moreover, since no dioxin
is reproduced, rapid cooling is unnecessary. |
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| Heavy
metal stabilizer is reduced significantly |
| Heating the fly ash to
above 400°C reconfigures heavy metals, which
reduces the amount of elution and thereby the amount
of heavy metal stabilizer required after heating. |
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| Lower
treatment costs |
| The technology helps
to save costs in a number of ways: excellent heating
efficiency results in lower heating costs; reduced
use of heavy metal stabilizer lowers the cost of
stabilization; less gas emissions mean only a small
amount of catalyst is needed; and heat recovery
from gas emissions yields significant savings of
energy. |
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| Suitable
for a wide range of capacities |
| The new technology is
suitable for applications covering a broad spectrum
of capacities, ranging from 100kg/h to 1,000kg/h. |
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| Agitating
fluidized-bed heating chamber |
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| Schematic
diagram of plant |
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=
1.3 - 1.5) substantially reduces the
volume of exhaust gas.
g-TEQ/ton
of waste
