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Adsorption Technology:
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CESCO is proud to be an authorized representative of Eisenmann, an industry leader in thermal oxidizers, regenerative thermal oxidizers, and rotary concentrators.
http://www.eisenmann.de/index.php?ci=343&lang=2&option=
In contrast to the thermal processes, adsorption takes place without chemical conversion of the pollutants and without significant increases in temperature. Adsorption is used to increase the concentration of lightly loaded exhaust air flows. The smaller and more concentrated the exhaust airflow, the lower the overall investment and operating costs. That's why especially large but lightly loaded exhaust air flows require concentration as a preliminary stage, in order to make the final oxidation or material recovery more economical. Adsorption exploits the special characteristic of specific solid materials(e.g. activated carbon, zeolite), to attract gases or vapors to settle on their surfaces. The settled pollutants must later be driven out. Adsorption is therefore always followed by desorption. The desorption flow being generated can be up to 30 times more concentrated with 30 times less air flow. Its purification or the solvent recovery is therefore significantly less expensive. The resulting purified air remains under the required emission limits.
| Guidelines for Adsorption Technology: |
3 = Excellent/
Applicable |
2 = Well/
Applicable |
1 = Limited Application |
0 = Not suitable |
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Adsorption |
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Wheel |
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Technology |
| Exhaust Air Volume |
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Nm3/hr |
scfm |
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50,000-1,000,000 |
29,430-588,600 |
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3 |
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5,000-50,000 |
2,943-29,430 |
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2 |
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1,000-5,000 |
589-2,943 |
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1 |
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| Pollutant Concentration |
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g/Nm3 |
ppm |
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>10 |
>10 |
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0 |
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5 -10 |
5 - 10 |
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1 |
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1- 5 |
1 - 5 |
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2 |
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<1 |
<1 |
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3 |
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| Exhaust Air Temperature |
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Deg C |
Deg F |
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>100 |
>212 |
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0 |
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30 - 100 |
86 - 212 |
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1 |
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<30 |
<86 |
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3 |
Absorption Wheel Technology
The wheel consists of chambers concentrically positioned around a shaft and containing activated carbon as adsorption material. The exhaust air is directed from above through the adsorption material. While doing so, the solvent molecules settle on the activated carbon. Desorption takes place in a separate section of the rotating wheel. Hot air is passed across the adsorption material in the opposite direction, and the settled pollutants are driven out. The resulting desorption flow can be with the use of several methods treated.
Adsorption Wheel + Thermal Oxidation:
The desorption flow is abated of via thermal oxidation. Recuperative thermal oxidation, rather than regenerative oxidation, with its associated heat recovery is especially beneficial in cases where extra energy to heat the desorption flow is not available from production.
Adsorption Wheel + Solvent Recovery:
In cases where high-quality solvents are being used, recovery is preferred. In addition to oxidation, CESCO can offer customized solutions for solvent recovery based on the principle of condensation. This technology offers an interesting alternative to oxidation, when the recovered solvents can be directly reused in the production process.
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This facility treats of 800,000 Nm3/hr
exhaust air from two top coat lines for
automobiles. At the heart of the facility
are 8 adsorption wheels with 2 additional
recuperative thermal oxidation systems.
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70,000 Nm3/hr exhaust air carrying
up to 300 kg/hr ethanol from the
printing processes of this manufacturer
of thermal print deco paper for the
textile industry are purified by two
adsorption wheels. The solvent is
recovered from the concentrated
desorption flow by condensation, and
directly re-routed to the production
process to mix new printing ink. |
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This paint manufacturer uses
adsorption wheel for the
purification of his production
exhaust air, which is loaded
with solvents and aromatic
substances. One adsorption wheel
purifies approximately 25,000 Nm3/hr
exhaust air from paint manufacturing
with a solvent content of approximately
0.2 g/m3. Recuperative thermal oxidation
is used to dispose of the very small,
concentrated desorption air flow. |
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In the paint shop of this car
manufacturer, 92,000 Nm3/hr
of spray booth exhaust air is
being concentrated with the use
of an adsorption wheel. A
regenerative oxidizer purifies the
desorption air together with
19,000 Nm3/hr of exhaust air
from 3 ovens. The joint purification
of the exhaust air from the spray
booth and the ovens keeps the operating
and investment costs to a minimum. |
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