Patent ID: 8616002

Claim:
A system comprising: a combustor having a region upstream from a combustion chamber, wherein the combustor has a longitudinal axis; and a premixing system disposed within the region of the combustor, the premixing system comprising: an upstream mixing panel comprising a plurality of first tubes extending from a first upstream plate to a first downstream plate, at least one first fuel plenum disposed between the first upstream plate and the first downstream plate, and a plurality of first fuel openings configured to pass a fuel, wherein each first tube of the plurality of first tubes extends in a first axial direction relative to the longitudinal axis from a first inlet to a first outlet, and each first tube is configured to receive air through the first inlet; a downstream mixing panel comprising a plurality of second tubes extending from a second upstream plate to a second downstream plate, at least one second fuel plenum disposed between the second upstream plate and the second downstream plate, and a plurality of second fuel openings, wherein each second tube of the plurality of second tubes extends in a second axial direction relative to the longitudinal axis from a second inlet to a second outlet, and each second tube is configured to receive a fuel-air mixture through the second inlet; and a premixing zone between the upstream mixing panel and the downstream mixing panel, wherein the premixing zone is configured to direct the fuel and the air from the upstream mixing panel into the downstream mixing panel as the fuel-air mixture into the second inlet of each second tube.