Emission Control
American Environmental
Fabrication & Supply, LLC


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Benefits of Renting vs. Owning Air Pollution Control Equipment
We have a ready to use air pollution control fleet or can design a specialized system for your plant operations. Some of the available systems include:
Granulated Activated Carbon (GAC) Systems, Biological Oxidation Systems, Wet Scrubbers, Regenerative, Catalytic and Direct Fired
Thermal Oxidizers
. Rentals range from 6 months to 5 years with flexible options.
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VOC Concentrators - Thermal Swing Regeneration Adsorption
VOC concentrators are used with thermal oxidizers on low VOC applications in times when the waste
process gas has very low concentration with little BTU value. The typical VOC concentration values are
between 5-10 to 1, thus allowing higher BTU values to be returned to the thermal oxidizer and burned, this
allows the thermal oxidizer to be operated without the use or with minimal amounts of auxiliary fuel.
Concentrators reduce the operating cost by loading the VOC's at a higher concentration. The reduced flow
allows the concentrated volume from the VOC concentrator to reduce the size of the thermal oxidizer
equipment.

The VOC Concentrator uses the thermal oxidizers exhaust to heat the concentrators media as a
mechanism to thermally swing the temperature of the adsorbed VOC and boil it from the adsorbent. This
cycling occurs after the adsorbent has fully adsorbed the processed VOC's. This has become to be known
as thermal swing regeneration. It is so named because the temperature is usually swung between ambient
and 250F to 350F in the regeneration process.

VOC's in the waste gas stream are first processed into one
of the adsorption units (three are usually used, but any number
above two may be used), while one of the adsorption beds is
being thermally regenerated. Hot air flows into the absorber;
this process heats the adsorbent, and thus boils off the VOC's.
The condensed VOC vapor may now be processed to the
thermal oxidizer for thermal destruction at a higher
concentration rate and higher inlet temperatures. This process
reduces the amount of auxiliary fuel required to sustain the
set point destruction temperature of the system.

After the VOC's  are removed, cooling air from a blower is admitted in place of the heated air. When the
adsorbent has cooled to ambient conditions, the “conditioned” adsorption capacity has been restored, and
the adsorption bed is now considered regenerated. Regeneration equipment may be designed to occur
between one and eight hours depending on the size of adsorption equipment. Regeneration may be at
either a preset time based on the average VOC concentration according to the design parameters or a
sensor which monitors any possible breakthrough conditions. A predictable air flow and concentration
would allow the regeneration to occur at a given time before any possible breakthrough occurs. The
PLC controlled timer will avoid any possible breakthrough emissions. A sensor controls the regeneration
process and monitors the evacuation process until no VOC's are present in the effluent exhaust from the
adsorbent bed to the thermal oxidizer.

Prior to any possible breakthrough of emissions, the PLC based timer should be used as the principal
control mechanism, VOC sensors are used as a failsafe mechanism to sense the process exhaust and
therefore any VOC's which would present themselves to the failsafe sensor would start the regeneration
cycle on the adsorption bed. While in greater concentrations some VOC's may minimally pass through the
adsorption bed before the sensor triggers the start of the regeneration cycle. This amount is insignificant
and should not be considered a violation of your permitting requirements. However when an event occurs
the sensor collects the VOC amount and data logs this information for reference use. Both the automated
timer and a sensor should be used. Thermal regeneration becomes more practical when VOC have lower
vapor pressures.

Concentrators allow the size of the emission purification unit to be reduced by a factor of 5 to 10,
minimizing investment and operating costs. On higher flows i.e. 100,000 SCFM the facilities can reduce
the cost of equipment to a 10,000 SCFM RTO system. When evaluating this reduction, the estimated
equipment cost for a Regenerative Thermal Oxidizer with a size of 100,000 SCFM may cost as much as
$5,000,000.00 when compared to a 10,000 SCFM system with a cost of approximately $400,000.00.
Should your plant have higher process streams it may be a practical alternative in reducing operating and
equipment costs.
Thermal Swing Adsorption System
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