Rich Reagent Injection (RRI) is a new NOx control technology
that provides coal-fired generating units with a cost-effective
means of complying with NOx regulations. The RRI process reduces
NOx formation by injecting amine-based compounds into the
fuel-rich regions of furnaces.
RRI process was originally developed for coal-fired cyclone
boilers, and performs well in the fuel-rich lower furnace
created by operating cyclone boilers with overfire air. Combined
overfire air and RRI technologies have been shown to reduce
cyclone NOx levels by more than 80%. The RRI process is also
applicable to other pulverized coal-fired units and industrial
is a complementary technology that can be coupled with other
NOx reduction technologies such as low-NOx burners, overfire
air, and Selective Non-Catalytic Reduction (SNCR). The RRI
process is particularly compatible with SNCR as it uses similar
chemicals and hardware, providing SNCR users a familiar operational
environment and economies of scale in capital costs. For applications
where ammonia slip is a concern, RRI provides a beneficial
alternative since it produces no ammonia slip.
development started with chemical kinetics modeling and advanced
computational fluid dynamics (CFD) modeling at REI. This was
followed by extensive laboratory testing at the University
of Utah and finally two full-scale demonstrations on EPRI-member
utility units, Conectiv's 160 MW B. L. England Unit 1 and
AmerenUE's 480 MW Sioux Unit 1.
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