Emission Control
American Environmental
Fabrication & Supply, LLC
Natural Gas Conditioning
Gas Separation Systems
VOC Biofiltration Systems
Granulated Carbon Systems
VOC Concentrators
Automated PLC Controls
Equipment Inspections - Installation - Rebuilds
Low NOx Burners
PSA Systems
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.
Cost Effective Amine Treater Off Gas Emissions Control
Typically natural gas processing plants treat the well head natural gas to remove water, CO2, sulfur
and other by products such as ethane, propane or other heavy hydrocarbons before transferring the
gas to the pipeline. Within the plant process the use of an amine stripper emits tail gas with residual
hydrocarbons that will have to be treated before emission discharge to comply with EPA regulations.

Solution That Is Cost Effective

Natural Gas and Refinery Plants have most often made use of Direct Fired Thermal Oxidizers with no
heat recovery systems. Direct Fired Thermal Oxidizers use considerable amounts of auxiliary fuel to
maintain temperatures at or above 1,500°F. Maintaining such high temperatures within the direct fired
thermal oxidizer ensures that all volatile organics are combusted. However, the added fuel costs are
significant in the daily operating costs.

Many Regenerative Thermal Oxidizer systems are now finding their way into the Natural Gas
Processing and Oil Refinery industries. Regenerative Thermal Oxidizers offer a far less expensive
means to regulatory compliance in these industries.

types of plant emissions. These industry types provide a fairly consistent flow of tail gas and RTO
systems can be easily designed. Natural Gas and Oil Refinery processing units provide ample VOC’s
in the form of off-gas to auto sustain the regenerative equipment. These RTO systems operate
without any additional fuel while limiting the energy costs associated with obtaining high negative
static duct pressures.

The structured ceramic media within the heat recovery bed can be reduced and generally provides
between 80 to 85% thermal efficiency. Standard two chamber or (bed designs) are implemented with
destruction efficiencies of 98% to 99% meeting all the necessary permitting requirements.   
Regenerative Thermal Oxidizers should be designed to prevent corrosion from any residual acid
gases while at the same time able to operate on high VOC loading with lower oxygen levels. Oxygen
levels of 3% or greater are preferred and should be monitored to minimize any CO formation. Caution
should be given to provide a reliable system that may contain some Hydrogen Sulfide (H2S) and
larger amounts of CO2. Moisture (RH) from the added ambient make up air may cause CO2 to form
carbonic acid within the RTO system. Typical residue from any carbonic acid (H2CO3) may form on
the bottom of the media beds, interior duct and valves. Periodic flushing or system burn outs should
be employed to reduce any media fouling. To lessen any carbonic acid formation a fresh air heater
may be used to provide heated supplemental oxygen without condensing any moisture into the
process stream. Heaters are typically used in the cooler regions of the country.

The adoption of a hot air by-pass system should be utilized to prevent RTO high temperature shut
downs during high VOC fluctuations within the tail gas. Using the hot air by-pass system, when VOC
spikes occur in the tail gas, enables the RTO system to expel any excess heat while continuing the
oxidation process and maintaining compliance. The hot air by pass system assures continuous plant
operation while not having to circumvent any tail gas to a stand by flare system. Circumvention of the
tail gas to the flare reduces the effective costs savings while causing momentary upset conditions to
PSD GHG Regulations
As stated by the United States Environmental Protection Agency, new major stationary sources of certain air pollutants, defined as “Regulated NSR pollutants and major modifications to existing major sources
are required to, among other things; obtain a PSD permit prior to construction or major modification. Once major sources become subject to PSD, these sources must, in order to obtain a PSD permit, meet
the various PSD requirements for new stationary emission guild lines.

PSD GHG Example
A proposed emissions unit emits five of the six GHG compounds in the following amounts: 50,000 TPY of CO2 - 60 TPY of methane - 1 TPY of nitrous oxide - 5 TPY of HFC-32 (a hydrofluorocarbon) - 3 TPY
of PFC-14 (a perfluorocarbon)

The GWP for each of the GHGs used in this example are: GHG GWP* - Carbon Dioxide 1 - Nitrous Oxide 310 - Methane 21 - HFC-32 650 - PFC-14 6,500
* As of the date of this document (see 40 CFR Part 98, Subpart A, Table A-1)

The GHGs mass-based emissions of the unit are calculated as follows: 50,000 TPY + 60 TPY + 1 TPY + 5 TPY + 3TPY = 50,069 TPY of GHGs

The CO2e-based emissions of the unit are calculated as follows: (50,000 TPY x 1) + (60 TPY x 21) + (1 TPY x 310) + (5 TPY x 650) + (3 TPY x 6,500) = 50,000 + 1,260 + 310 + 3,250 + 19,500 =
74,320 TPY CO2
Note: Short tons (2,000 lbs), not long or metric tons, are used in PSD applicability calculations.
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Our working process
in 3 steps

planing & strategy

test & deliver

design & develop
Our Corporate goal is to implement the
correct design criteria with the use of
proper metals, instruments and controls to
achieve the required result with the least
amount of maintenance and associated
energy costs.

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chemical, thermal and biological reactions
that achieves the required process result.
Results shall be based on reaction rates
and proper control logic.
before it leaves the plant. It is our way of
knowing that you are receiving correctly
designed equipment to meet your specific