What is DLN?

Providing F-class efficiency for today’s changing energy mix

In the past, gas plants were engineered to provide base load efficient power, but today, with the dramatic increase of weather-dependent solar and wind capacity, gas plants are being asked to provide critical renewable-balancing grid support, making flexibility a priority now more than ever. DLN combustor systems not only provide this flexibility, but also help meet the needs of increasing emissions regulations. To remain competitive, F-class plant owners and operators must address the competing challenges of pressure to comply with more stringent emissions regulations, changing operating profiles that go beyond a plant’s original design, and finding innovative ways to stay profitable.

Building on a rich heritage of combustion leadership, our DLN combustion technology delivers industry-leading low emissions. For F class operators, we offer four DLN 2.6 solutions. What you choose will ultimately depend on you and your plant’s needs, but whichever DLN combustion system solution is right for you, rest assured that you’ll get leading-edge expertise and the operational flexibility you need, helping you reduce emissions and start up faster than ever before.

Which combustion system is right for you?

Want to learn more about DLN? Take a look at each solution’s features and benefits:

  DLN 2.6 DLN 2.6+ 7F DLN 2.6+ FLEX
Applicable turbine models 6F, 7F 6F, 7F, 9F 7F
Key value statement Get improved O&M outage interval costs. Take advantage of improved capacity, minimum fuel burn, and O&M part/outage costs. Turndown to ~26% GT load using GE's Axial Fuel Staging (AFS) technology. Reduce minimum fuel burn by 25%, leading to annual fuel savings of $1-4M.
Core benefits Outage extension
  • Outage extension
  • Emissions reduction
  • Enhanced load range
  • Lower turndown
  • Emissions reduction
  • Increased operational flexibility
  • Outage extension
  • Increased utilization
  • NOx/CO-compliant turndown as low as 25%
Emissions range <9ppm NOx and CO2 reduction 5-9ppm NOx reduction 5-9ppm NOx reduction
Availability and maintenance cost
  • 24,000 factored fired hours (FFH)
  • 900 factored fired starts (FFS)
  • Up to 32,000 factored fired hours (FFH)
  • Up to 1,250 factored fired starts (FFS)
  • 32,000 factored fired hours (FFH)
  • 1,250 factored fired starts (FFS)
Operational flexibility (exact figures may vary by model) Extend turndown to as low as 48% of baseload Extend turndown to as low as 38% of baseload
  • Load range expansion by ~100 MW*
  • Lower turndown capability to 26% GT load
Fuel flexibility Over a range of natural gas or distillate fuel compositions Broad fuel flexibility with up to 30% Modified Wobbe Index (MWI), 25% ethane/propane, 20% hydrogen and a wide range of distillate fuels Broad fuel flexibility with up to 30% Modified Wobbe Index (MWI), 25% ethane/propane, 5-10% hydrogen and a wide range of distillate fuels
Add-ons
  • Improve operability when combined with OpFlex controls software including AutoTune, Fast Start, Cold-Day Performance, and Extended Turndown
  • Eliminate costly diluent injection or selective catalytic reduction (SCR) systems
  • Accelerate start times with OpFlex Fast Start, Variable Load Path, ST Agility, or ST Warming Blankets
  • Add maintenance neutral peaking with Dispatch Optimizer
  • Improve operability when combined with OpFlex controls software including AutoTune, and Cold-Day Performance
  • Eliminate costly diluent injection or selective catalytic reduction (SCR) systems
  • Enhance Advanced Gas Path (AGP) and compressor upgrade performance and operability
  • Accelerate start times with OpFlex Fast Start, Variable Load Path, ST Agility, or ST Warming Blankets
  • Add maintenance neutral peaking with Dispatch Optimizer
  • Improve operability when combined with OpFlex controls software including AutoTune, and Cold-Day Performance
  • Eliminate costly diluent injection or selective catalytic reduction (SCR) systems
  • Enhance Advanced Gas Path (AGP) and compressor upgrade performance and operability

*For a 2x1 configuration

7F DLN 2.6 technology

A 30-year journey

The 7F frame was developed at a time where deregulation and global warming were emerging factors in the power industry. GE has continued to evolve its F-class and DLN technologies, maintaining them as proven standards for economical, efficient, cleaner power generation.

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Case study

Southern California Public Power Authority (SCPPA)

SCPPA’s Magnolia power plant mission is to provide reliable low-cost power to Los Angeles County residents, and they wanted to both lessen operating losses that occurred during negative power prices and avoid starts, since the plant is limited to five starts per month based on their air permit.

GE will upgrade one 7FA.03 unit at Magnolia, which is expected to increase operational flexibility, lower maintenance and fuel costs, and reduce emissions. This technology will expand Magnolia’s load ranges so they can run their plant at lower loads to tolerate adverse market conditions for longer periods of time. The additional improved turndown will help mitigate negative spark spreads, reduces fuel consumption, and can decrease financial penalties for overgeneration.

Magnolia’s expected benefits from the DLN combustion upgrade include approximately 25 percentage points of reduced turndown and emissions and reduction in fuel consumption, ultimately allowing Magnolia to be more cost effective.