Field Proven 3-5 PPM NOx
The patented LEC III™ gas turbine combustion technology, developed and manufactured by PSM, guarantees sub-5 parts-per-million (ppm) NOx emission levels when operated on natural gas over the entire premix operating range, from baseload down to 80% relative load (respectively 50%-60% with Inlet Bleed Heat system). CO emissions under these conditions are typically measured in the low single digits to meet customer requirements. Three key design features in the LEC III™ combustion system enable this improved process and fundamentally differentiate the LEC III™ from the OEM design: the forward-flowing venturi, effusion cooling technology, and an advanced secondary fuel nozzle (SFN).
Drop-In, Conversion, or Individual Parts Replacement
PSM implemented the LEC III™ system for B & E-class turbines, such as GE Frames 6B, 7B/EA, 9E, and Siemens/Westinghouse 501B6/D5, either as a drop-in replacement for existing OEM DLN1 systems or a complete conversion from standard diffusion combustion systems. There is no need to change the control systems for vintages Mark V and higher. Operators of DLN1 combustors also have the option to individually replace their OEM system components with PSM’s LEC III™ parts.
Fuel Air Mixing is the Key
A thorough and efficient premixing of the fuel and air before the combustion process is the key to low NOx and CO emissions in the PSM LEC III™ combustion system. Three key design features in the LEC III™ combustion system enable this improved process and fundamentally differentiate PSM from other manufacturers. LEC III™ from the OEM design: the forward-flowing venturi, effusion cooling technology, and an advanced secondary fuel nozzle (SFN).
LEC NextGen Highly Durable sub 9ppm NOx
Introduced in 2015, the LEC NextGen has been developed from the original LEC I and LEC III™ systems in response to the global power generation requirements for increased durability throughout an increased load range while maintaining sub 9ppm NOx and single-digit CO in premix operation. The system is compatible with 7121EA, 9171E, and older turbine models either as a drop-in replacement to the OEM DLN1.0 or as a conversion from standard diffusion frame systems. Both LEC systems are 24,000-32,000 FFH systems. Dual Fuel capability combined with other upgrades such as Steam Injection for Power Augmentation (PAG Steam) or Inlet Bleed Heat Systems (IBH) provides a wide operating range.
Advanced Combustion Solutions
PSM has developed combustion solutions specifically to serve its market needs worldwide. Major environmental concerns make reducing emission levels a priority for the entire industry. We have developed several alternative systems to meet this concern. As a result, we have broken numerous emission records with our dry low NOx systems. Simply installing this system to replace conventional combustion in turbines will reduce CO and NOx levels in the environment. Additional enhancements have allowed utilizing these systems for operational and fuel flexibility as the needs of the market change.
System Differentiations of LEC III™ and LEC NextGen
We originally designed the PSM LEC III™ system for ultra-low emissions, which necessitated a unique design incorporating a forward-flowing venturi and effusion cooling technology. With this design, the LEC III™ system is gas only. However, to accommodate dual-fuel users, PSM developed the LEC NextGen system in 2015. The LEC NextGen system is compatible with PSM’s upgraded transition piece, fuel nozzles, flow sleeves, and traditional DLN systems allowing for greater flexibility. In addition, the LEC NextGen liner has upgraded features, including an advanced flowing combustion cap, a thicker lower liner, and enhanced wear features while utilizing a standard flow venturi, which allows the system to be more flexible in operation but does have a higher emissions output than the LEC III™ system (as low as sub-7ppm).
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LEC-Next Gen Brochure
