Forney SCR Reheating User Manual

Forney Hardware

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SCR Reheaters

Ensure Maximum SCR efficiency on low load swings with Forney’s SCR Reheaters.

Power plants must meet both stringent NOx reduction regulation and their customers'
needs of varying electricity demands by reducing their boiler's steam production.
Reducing boiler load causes lower flue gas temperatures reducing the operating abilities
of NOx control equipment such as selective catalytic reduction (SCR) reactors.
Forney Corporation utilized its vast combustion experience to develop a line of SCR
reheaters to supplement flue gas temperatures. When firing conditions dictate the
need for this additional heat, Forney's SCR reheaters pump heat into the flue gas
stream, thereby maintaining a flue gas temperature that ensures maximum SCR
efficiency. Forney can design a system for any configuration using one of three
solutions, sure to satisfy your installation requirements.

Forney was the first to introduce an external firing solution. This remedy

is ideal for high ash environments because it eliminates the problems of slag-
ging, ash build-up, and burner fouling by designing the combustion equipment
to operate outside the boiler flue gas duct. Also, the external burners do not
increase system pressure drop, making them ideal for retrofit applications.

When boiler arrangement or customer preference does not permit an

external SCR reheater system, particularly in low dust flue gas streams,
Forney's reliable duct burner provides a compact in-duct burner system for
flue gas temperature control. The duct burner solution minimizes heat input
requirements and ongoing operating costs by providing reliable and even heat
distribution for effective SCR operation.

Forney's Perimeter-firing system combines the benefits of both in-duct and

external duct firing solutions. Strategically mounted directly on the flue gas
duct work, perimeter burners inject a high velocity, high temperature stream
directly into the flue gas creating excellent heat distribution to the SCR, in either
low or high dust applications.


offering external, in-duct, or
perimeter fired SCR reheater
systems. Our engineers will
custom design and integrate the
system appropriate for your plant.


Compared to installing an
economizer bypass system, a flue
gas reheat system can save expense
on installation and the loss of
efficiency experienced with an
economizer bypass system.

·· CFD MODELING - Forney

engineering can perform CFD
modeling of heat distribution to
assure efficient SCR operation.

·· EXPERIENCE - Forney

technologies are proven in SCR and
other firing applications around the

·· SERVICE - Forney service

engineers provide start-up
expertise and periodic maintenance
capabilities to ensure your
equipment operates reliably.


Register Style Burner

Grid Style Burner

Perimeter Burner