초록 ▼

It has been found that in a dry low NOx combustor of the type having an upstream combustion chamber and a downstream combustion chamber interconnected by a venturi section, the fuel-air ratio and uniform fuel-air mixing can be improved by providing an annular shield upstream of the venturi region. T

It has been found that in a dry low NOx combustor of the type having an upstream combustion chamber and a downstream combustion chamber interconnected by a venturi section, the fuel-air ratio and uniform fuel-air mixing can be improved by providing an annular shield upstream of the venturi region. The shield is impingement cooled through the venturi and provision is made for dumping cooling air farther downsteam in the downstream combustion chamber. With the aforesaid improvements in mind, the upstream combustion chamber is provided with first and second inner liners which are also impringement cooled an which provide combustion air farther upstream into the upstream combustion chamber to further improve fuel-air mixing and to maintain the desired fuel-air ratio.

대표청구항 ▼

An improved gas turbine combustor of the type having an upstream combustion chamber and a downstream combustion chamber interconnected by a venturi throat region having an upstream wall and a downstream wall interconnected by an axial wall; a plurality of primary nozzles in annular array for introdu

An improved gas turbine combustor of the type having an upstream combustion chamber and a downstream combustion chamber interconnected by a venturi throat region having an upstream wall and a downstream wall interconnected by an axial wall; a plurality of primary nozzles in annular array for introducing fuel into the upstream combustion chamber; a central nozzle for introducing fuel into the downstream combustion chamber; wherein the improvement comprises: an annular shield positioned, in part, upstream from the venturi throat; the annular shield having a radially inwardly slanted portion and an axial portion; a plurality of impingement cooling holes in the upstream wall of the venturi region directed at the radially inwardly slanted portion of the annular shield whereby impingement cooling of the slanted shield portion is effected; and further comprising a ring attached to the axial wall of the venturi region and having a free and extending downstream, the ring defining an acute angle with the downstream wall of the venturi region; and an extended portion of the shield axial portion extending downstream and coaxial with the ring.