30 years of field experience operating on multi-nozzle quiet combustors (MNQC); first field test conducted in 1985.


A chemical reaction in a combustor must occur in a fraction of a second, while air rushes through and fuel flows through the combustor at a speed equivalent to a 100 mph wind.


Over 50 million fired hours on DLN in F- and H-class turbines; ~32 million in DLN 2.6.

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A650 steam turbine

Fuels Capability

Flexible Equipment and Solutions

Industry-leading combustion technologies, hardware, and controls to help our customers utilize a broad range of fuels.

Combustion technology is constantly evolving, and GE has multiple combustion systems that can be applied across its gas turbine portfolio. GE’s combustion systems have accrued over 190 million fired hours using the range of available combustion systems: Dry Low NOx Combustion Systems (DLN1/DLN1+, DLN 2.6/DLN 2.6+), and Diffusion Flame - Single Nozzle (Standard Combustor) and Multi-Nozzle Quiet Combustors (MNQC).






The DLN1 and DLN1+ combustion systems are proven technology platforms that help power plant operators meet increasingly strict environmental standards, while providing operational and fuel flexibility.

  • Installed on more than 870 B- and E-class gas turbines globally
  • More than 28 million operating hours, including more than 730,000 fired hours on the DLN1+ combustion system
  • DLN 1+ system is capable of NOx emissions of 5 ppm or less for GE’s 6B, 7E, and 9E gas turbines
  • Highly fuel flexible and capable of operating on a wide variety of gas fuels, including gases with high ethane and propane content, as well as distillate oil and other liquid fuels
  • Available in a gas only or dual fuel configuration

The DLN1 and DLN1+ combustion systems are available on B- and E-class gas turbines.



The DLN2 family of combustion systems (DLN2.5, DLN2.6, DLN2.6+, DLN2.6+AFS) is available on F- and H-class gas turbines and helps reduce NOx emissions while extending outage intervals.

  • Installed on more than 1,150 gas turbines globally
  • Over 26 million operating hours; proven benefits, including increased operational and fuel flexibility, reduced emissions, extended intervals, and higher performance while maintaining life cycle costs
  • Can operate on a wide variety of gas and liquid fuels
  • Available in gas-only and dual fuel configurations


Diffusion Flame - Standard Combustor and MNQC

In addition to the DLN combustion systems, GE offers two diffusion flame combustion systems for use in non-traditional fuel applications: single nozzle (standard combustor) and multi-nozzle quiet combustors (MNQC).

GE’s diffusion flame combustion systems have been installed on more than 1,700 gas turbines, providing robust power generation solutions using a variety of non-traditional fuels for more than 30 years. Applications include refineries, steel mills, petrochemical plants, and IGCC power plants, as well as providing power in a variety of oil and gas settings.

  • More than 270 E-class gas turbines are configured with the single nozzle combustor operating on Heavy Fuel Oil (HFO).
  • Single nozzle and multi-nozzle combustors have been installed on more than 50 B-, E-, and F-class gas turbines in low calorific gas applications, such as syngas, blast furnace gas, coke oven gas, and other process gases. These units have accumulated more than 2.1 million operating hours, with the fleet leader in this application space accruing more than 100,000 fired hours.
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Continued Evolution of DLN Technology

Since the 1970s when GE introduced DLN, development programs have focused on evolutionary systems capable of meeting the extremely low NOx levels required to meet current and future regulations, while providing customers with a range of operational and fuel flexibility options. GE continually evolves its proven combustion systems, including the related accessory system hardware to help customers enhance fuel utilization, reduce fuel costs, and enhance revenues.

As a result, GE’s versatile gas turbines can operate on a variety of fuels, including gases with a wide range of heating values, like steel mill gases, syngas, lean methane fuels, natural gas, higher order hydrocarbons, and high hydrogen fuels. They also accommodate liquid fuels, including refined products, such as distillate and naphtha, and a range of ash bearing fuels, including light, medium, and heavy crude oils, as well as HFO.

Gas Turbine Combustion Technology Evolution


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