7F axial fuel staging upgrade

Increasing low-cost renewable energy production is driving many thermal power plants into greater cyclic operation, exposing these plants to increased maintenance costs from more frequent start-stop cycles. Enhancing your gas turbine power plant with technology to become more flexible can help reduce or avoid cycling by improving the economics to remain online at low loads during off peak hours. Axial fuel staging (AFS) is a proven combustion upgrade that adds a downstream fuel circuit, staging part of the fuel and air mixture later in the combustion process. This enables the 7F gas turbine to run at a significantly lower minimum load while remaining in emissions compliance, reducing fuel burn and operating costs to stay online.

With the AFS upgrade added to your DLN 2.6+ combustion system, you can realize even lower turndown in emissions compliance, reduced renewable curtailment, and increased access to ancillary payments via an expanded dispatchable load range.

The AFS upgrade axially stages combustion in two zones. This allows the DLN2.6+ combustor to have enhanced performance at both baseload and minimum turndown. Here’s a look at how the technology functions (model simplified for clarity).