SELECTIVE CATALYTIC REDUCTION SYSTEMS
(SCR'S)
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Today’s demand for turbine based peak power
generation requires a generating plant that is highly reliable, is
available on short notice and meets stringent noise and emissions
standards. An integral component of any peaker unit is the
Selective Catalytic Reduction (SCR) system utilizing specialized
catalysts for the reduction of NOx and CO. Turner
EnviroLogic’s SCR’s are proven, innovative, reliable and
economical.
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NOx & CO Reductions Up to
96%
Key to achieving high rates of NOx and CO
reduction is even air flow across the catalyst banks and even
distribution of ammonia across the face of the NOx catalyst.
Reducing the characteristic turbine exhaust swirl and achieving
even air flow distribution are accomplished using turning vanes in
the transition section downstream of the turbine
exhaust. Turning vanes are much more efficient than
perforated plates alone in distributing even air flow, especially
during reduced turbine loads when perforated plates lose their
effectiveness as air volumes are reduced.
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Improved Ammonia
Distribution
Turner EnviroLogic has developed
an “H-Header” system for improved ammonia distribution that
ensures greater rates of NOx conversion and reduced ammonia
slip. The H-Header system is an array of header pipes, each
with numerous small ammonia distributor ports, arranged evenly
across the face of the NOx catalyst bank. The system is
self-balancing so it does not require expensive valves or
complicated balancing procedures to be effective.
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Low Parasitic
Load
Fast start up along with low power usage
and low pressure drop means Turner EnviroLogic’s SCRs save
money. A slip-stream of hot turbine gases pulled from the
turbine exhaust is used to vaporize ammonia. This eliminates
the need for expensive and maintenance prone electric
heaters. The high electrical cost to operate electric
heaters is also eliminated. Our SCR comes on line more quickly
since the hot gases are available to vaporize ammonia within
minutes. There is no need to wait for electric heaters
to heat up. System pressure drop is kept to a minimum
through the use of turning vanes as opposed to perforated
distribution plates
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Computer
Modeling
Each SCR application undergoes
extensive computer modeling using state of the art CFD
techniques to verify the effectiveness of turning vanes used
to straighten and evenly distribute air flows and ammonia.
Iterative design changes progress rapidly to fine tune SCR
design. We get it right the first time!
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Ease of Installation
Each truck load of panels is shrink wrapped to protect
them in transit and at the job site. Once at the
construction site the piece marked panels are assembled with a
proven bolting method. Only minimal field welding is
required.
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The time and cost of installing Turner
EnviroLogic’s SCR are reduced by virtue of our proven bolt
together design. Each panel that makes up the catalyst
housing is pre-fabricated at the factory including full insulation
and cladding with protective stainless steel sheeting.
Panels are held together in shipping racks that maximize truck
loads for shipment.
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SCR’s for Industrial
Markets
Industrial furnaces or other processes
can create excessive NOx levels. We can design and build SCR’s
specifically designed for your conditions to achieve the desired
NOx reduction.
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Most industrial units are significantly smaller
than turbine systems, and can be shipped assembled for “drop
in” installation. These units can include provisions for
pre-cooling and conditioning the exhaust gases prior to treatment.
The SCR can utilize gaseous or aqueous ammonia, or urea for
reduction. The systems can include ammonia delivery systems,
controls, exhaust fans, and stacks as
required.
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