Fabrication & Supply, LLC
Natural Gas Conditioning
Gas Separation Systems
VOC Biofiltration Systems
|Granulated Carbon Systems
|Equipment Inspections - Installation - Rebuilds
Low NOx Burners
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 Oxidizer Systems, Wet Scrubbers, Regenerative, Catalytic and Direct Fired Thermal
Oxidizers. Rentals range from 6 months to 5 years with flexible options.
|Helpful Equipment Information
|The Different Types of Thermal Oxidizers
Recuperative Thermal Oxidizers
A Recuperative Oxidizer utilizes two heat transfer systems; a primary and / or secondary heat air by heat
exchanger and sometimes by a plate-type exchanger. As the process waste-gas passes on one side of
opposite side of the shell tube or plate exchanger at that material as the conducting heat transfer
medium. The second heat exchanger is essentially the same as the first, but utilizes the recuperative
super heated exhaust stream to pre-heat clean plant air to be used somewhere in the plant process.
Regenerative Thermal Oxidizers
A Regenerative Thermal Oxidizer operates on the principal of thermal oxidation and the use of two or
three heat recovery beds or chambers. These heat recovery chambers use a heat sink material within
the bed area. The heat sink media is usually made of ceramic material, the best technology today is the
use of structured ceramic blocks with a certain number of perforations according to the heat retention
and pressure drop requirements.
The ceramic heat recovery media acts as a heat exchanger for the system. The heat recovery beds or
chambers function under a "swing bed" heat recovery or absorptive principle in which the transfer of
heat takes place by means of process flow through two beds by reversal.
When the waste-gas process stream travels through the first heat recovery ceramic media bed, the
waste-gas process stream adsorbs the radiant energy stored in the structured ceramic media bed; this
process assists in preheating the waste-gas process stream. The pre heated waste-gas process stream
then enters the reaction chamber where the burner or temperature is held at the required system
operating temperature. After the temperature has been elevated and retained for the appropriate
retention time, the waste-gas is cleaned and the cleaned process stream passes through the second
heat recovery bed or chamber.
The cleaned process stream passes through the heat recovery chamber; the cold structured ceramic
media absorbs the BTU energy of the super heated process exhaust stream, and retains the heat
energy for the reversal of the thermal system. Once the radiant heat energy of the first heat recovery
bed has been depleted through the absorption of the incoming air stream, the process flow system is
then rotated, so the incoming waste-gas process stream is then directed through the previous heat
recovery chamber, with the clean waste gas stream going through the previous directed chamber.
The exhaust flow reversal minimizes the amount of supplemental fuel needed by using the radiant heat
energy from the structured ceramic media beds or chambers. A well designed heat recovery bed will be
able to operate on as much as 90% thermal efficiency saving thousands of dollars annually.
A catalytic thermal oxidizer system usually operates in the temperature range of 550°F - 650°F (275ºC
to 350ºC). The operating temperature is substantially lower than most the forms of thermal oxidation,
many manufactures now have designed catalyst that is more durable and can operate at higher
temperatures without damage. Some catalyst temperatures may reach up to 900°F - 1100°F (482 ºC -
593 ºC) without damage.
Direct Fired Thermal Oxidizer (Afterburner)
The DFTO is an well utilized technology for process streams heavily laden with VOC pollutants and
intermittent batch processes where the oxidizer can come be prepared to process streams relatively
quickly. Direct fired thermal oxidizer uses a specially designed burner to raise the temperature of a
pollutant laden air stream to a predetermined combustion temperature. In the equipment operation, the
contaminated process exhaust is ducted into a burner chamber. Heat applied by the burner oxidizes the
VOC's and HAP's creating harmless products of combustion (water and carbon dioxide). The clean,
heated exhaust gas can then be discharged to the atmosphere or processed by a optional heat
Direct Fired Thermal Oxidizers achieve over 99% hydrocarbon destruction rate efficiency. To achieve this the heated air is kept in the combustion chamber for a specified amount of time, called the
residence time. At the inlet to the combustion chamber turbulence is generated to mix the pollutants and oxygen molecules. Proper mixing of the combustion air and process streams provides higher
destruction efficiencies in a safe manner. Systems should be designed to minimize the risk of explosion and takes complete advantage of the VOC laden exhaust stream to minimize auxiliary fuel needs. On
process that are rich in BTU values a burner system should be designed to use process streams directly into the burner as fuel. After burners can be designed to operate on small tank vents to the largest of
industrial plant applications. Special designed systems can be designed to process streams that contain acids such as carbonic, hydrochloric or sulfuric acid.
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correct design criteria with the use of
proper metals, instruments and controls to
achieve the required result with the least
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