CLN^® Overview

Following a successful series of atmospheric test-rig and on-engine tests at SRI International’s cogeneration facility in Menlo Park, California, International Power Technology now offers the Cheng Low NOx^® (CLN^®) technology as a low-emissions retrofit solution for current owners of Allison 501-K(x) gas turbines.

CLN^®, developed by Dr. Dah Yu Cheng of Cheng Power Systems, is a revolutionary new emissions control technology that significantly reduces turbine emissions through the homogeneous mixing of steam and fuel prior to combustion (ASME Paper, Reduction of NOx and CO To Below 2PPM In A Diffusion Flame).  The CLN^® system as currently configured at the SRI facility has demonstrated single-digit NOx and CO at full turbine firing temperature of 1895 Deg. F.

The CLN^® is operational on two Allison 501-K gas turbines, one 501-KH in Menlo Park, California that has been operational since February 2005 and one 501-KB7 at a paper mill in Germany.  The KH unit was retrofitted with CLN^® to get off water injection and the KB7 unit was a DLE conversion to CLN^®.

The CLN^® system is also operational on two GE Frame 6B gas turbines located at the Chevron El Segundo, California refinery.

Candidates for a retrofit to the CLN^® technology include: 

1)     Customers seeking to get off water injection,

2)     Customers needing to reduce NOx and CO for regulatory reasons,

3)     Customers wanting to voluntarily reduce NOx and CO emissions to sell the offsets on the open market, and

4)  New source review (NSR) applications requiring ultra-low NOx.

Unlike other currently available low-emissions solutions the CLN^® system actually reduces ongoing operating costs, requires a minimal amount of additional space for installation, and introduces no environmental concerns such as ammonia slip or required disposal of toxic spent catalyst. 

The CLN^® technology uses saturated steam mixed with fuel to produce ultra-low emissions.  The steam is mixed with the fuel to a very high level of homogeneity in hardware that is off-engine and compact.  Standard OEM combustion liners and fuel nozzles can be used in applications requiring not less than 20 ppm NOx and CO.  Specifically designed IPT fuel nozzles are substituted for OEM nozzles in applications where less than 20 ppm NOx and CO are needed.  The CLN^® system has been proven in practice, is commercially available, and is fully guaranteed.

IPT will. free of charge, perform an initial site survey to assess the applicability of the CLN^® system to the customer’s plant, and to determine the amount of steam piping and other modifications required to complete the installation.  IPT will then present its findings along with an economic analysis and a pricing proposal for a complete turnkey installation of a CLN^® system at the customer’s facility.

Interested plant owners are welcome to schedule a tour to view our CLN^® installation in Menlo Park, California.  If you have questions regarding the CLN^® technology, or would like to schedule a plant tour, please contact:

Randy Turley

(408) 246-9040

r.turley@intpower.com