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Aeroderivative Gas Turbines Can Meet Stringent NOx Control Requirements
Date
1987-09Metadata
Show full item recordAbstract
Gas Turbines operating in the United States
are required to meet federally mandated emission
standards. This article will discuss how General
Electric's LM industrial aeroderivative gas
turbines are meeting NOx requirements as low as
25 parts per million using steam injection.
The article will also describe the technical
aspects of how water or steam injection can be
used to supress NOx, what emission levels GE will
guarantee and detail some recently obtained test
results.
The side benefits of water or steam
injection for controlling NOx emissions will be
discussed. Steam injection has a very favorable
effect on engine performance raising both the
power output and efficiency. As an example, full
steam injection in the GE LM5000 gas turbine
increases the power output from 34 MW to 52 MW
while lowering the heat rate from 9,152 Btu/kWh
to 7,684 Btu/kWh when fired on natural gas.
Water injection increases power output at a
slightly decreased thermal efficiency. When
steam is injected, NOx can be controlled to 25
ppm (referenced to 15 percent O2) which is
sufficient to comply with the most stringent
requirements imposed in areas where water or
steam injection is considered best available
control technology (BACT).
Selective Catalytic Reduction (SCR) systems
are currently employed in areas with Lowest
Achievable Emissions Requirements. SCRs have
been proposed as BACT in several areas such as
the Bay area of California and the state of New
Jersey. These systems are expensive to install
and operate, and this cost impact can cause many
projects to become economically non-viable. Cost
comparisons for NOx removal using an SCR in
combination with the steam injection will
demonstrate the large incremental cost incurred
when NOx is controlled using an SCR.
Lastly, a case will be made for not imposing
SCR as BACT in that it would close the door on
further research and development for better,
cost-effective methods of NOx control.
Subject
Industrial Aeroderivative Gas TurbineNOx Requirements
Steam Injection
Selective Catalytic Reduction (SCR) Systems
Best Available Control Technology (BACT)
Collections
Citation
Keller, S. C.; Studniarz, J. J. (1987). Aeroderivative Gas Turbines Can Meet Stringent NOx Control Requirements. Energy Systems Laboratory (http://esl.eslwin.tamu.edu). Available electronically from https : / /hdl .handle .net /1969 .1 /92828.