Demonstration of selective catalytic reduction (SCR) technology for the control of nitrogen oxide (NOx) emissions from high-sulfur coal-fired boilers Page: 4 of 57
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Section 1
SUMMARY
The objective of this project is to demonstrate and evaluate commercially
available Selective Catalytic Reduction (SCR) catalysts from U. S., Japanese
and European catalyst suppliers on a high-sulfur U. S. coal-fired boiler. SCR
is a post-combustion nitrogen oxide (NOx) control technology that involves
injecting ammonia into the flue gas generated from coal combustion in an
electric utility boiler. The flue gas containing ammonia is then passed
through a reactor that contains a specialized catalyst. In the presence of
the catalyst, the ammonia reacts with NOx to convert it to nitrogen and water
vapor.
Although SCR is widely practiced in Japan and Europe, there are numerous
technical uncertainties associated with applying SCR to U. S. coals. These
uncertainties include:
(1) potential catalyst deactivation due to poisoning by trace
metal species present in U.S. coals that are not present in
other fuels.
(2) performance of the technology and effects on the balance-of-
plant equipment in the presence of high amounts of SC2 and
SO,.
(3) performance of a wide variety of SCR catalyst compositions,
geometries and methods of manufacture under typical high-
sulfur coal-fired utility operating conditions.
These uncertainties will be explored by constructing a series of small-scale
SCR reactors and simultaneously exposing different SCR catalysts to flue gas
derived from the combustion of high sulfur U. S. coal.
The demonstration will be performed at Gulf Power Company’s Plant Crist Unit
No. 5 (75 MW capacity) near Pensacola, Florida. The project will be funded by
the U. S. Department of Energy (DOE), Southern Company Services, Inc. (SCS on
behalf of the entire Southern electric system), and the Electric Power
Research Institute (EPRI). SCS is the participant responsible for managing
all aspects of this project.
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Demonstration of selective catalytic reduction (SCR) technology for the control of nitrogen oxide (NOx) emissions from high-sulfur coal-fired boilers, report, November 1, 1991; Birmingham, Alabama. (https://digital.library.unt.edu/ark:/67531/metadc1093381/m1/4/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.