US 11,054,138 B2
Shroud structure for improving swozzle flow and combustor burner using the same
Moon Soo Cho, Seoul (KR); and In Chan Choi, Gwangyang-si (KR)
Filed by DOOSAN HEAVY INDUSTRIES & CONSTRUCTION CO., LTD., Changwon-si (KR)
Filed on Aug. 23, 2018, as Appl. No. 16/111,165.
Claims priority of application No. 10-2017-0130104 (KR), filed on Oct. 11, 2017.
Prior Publication US 2019/0107281 A1, Apr. 11, 2019
Int. Cl. F23R 3/14 (2006.01); F23R 3/46 (2006.01); F23R 3/28 (2006.01)
CPC F23R 3/14 (2013.01) [F23R 3/286 (2013.01); F23R 3/46 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A shroud structure for improving swozzle flow, comprising:
a shroud configured to surround a combustion nozzle and a plurality of swirlers provided along a circumferential row RX of an outer circumferential surface of the shroud in which a plurality of inlets are formed to draw in compressed air flowing outside the shroud, the compressed air being drawn into the shroud before being mixed with fuel,
a first fuel injector provided on an inner circumferential surface of a combustor casing and faces a circumferential row RY of an outer circumferential surface of the shroud,
wherein the plurality of inlets are disposed upstream of the circumferential row RY of the outer circumferential surface of the shroud that faces the first fuel injector so that the compressed air guided into the plurality of inlets is supplied to a region formed around a second fuel injector provided in the plurality of swirlers in the shroud, and
wherein the plurality of inlets comprise:
a first inlet disposed along a first circumferential row (R1) of the outer circumferential surface of the shroud, the first circumferential row positioned before the plurality of swirlers; and
a second inlet disposed along a second circumferential row (R3) of the outer circumferential surface of the shroud, the second circumferential row positioned after the circumferential row RX and positioned before the circumferential row RY, such that the second inlet is disposed in a region between the circumferential row RY and the circumferential row RX.
 
13. A burner assembly in which a plurality of burners are disposed along a combustor casing having an annular shape, each burner comprising:
a combustion nozzle configured to eject fuel to be mixed with compressed air;
a plurality of swirlers provided along a circumferential direction of the combustion nozzle;
and a shroud configured to surround the combustion nozzle and to house the plurality of swirlers to form a swozzle flow of pre-mixed air, the shroud having an outer circumferential surface in which a plurality of inlets are formed to draw in the compressed air flowing outside the shroud, the compressed air being drawn into the shroud before being mixed with the fuel,
wherein the plurality of swirlers are provided along a circumferential row RX of the outer circumferential surface of the shroud,
a first fuel injector provided on an inner circumferential surface of a combustor casing and faces a circumferential row RY of an outer circumferential surface of the shroud,
wherein the plurality of inlets are disposed upstream of the circumferential row RY of the outer circumferential surface of the shroud that faces the first fuel injector so that the compressed air guided into the plurality of inlets is supplied to a region formed around a second fuel injector provided in the plurality of swirlers in the shroud, and
wherein the plurality of inlets comprise:
a first inlet disposed along a first circumferential row (R1) of the outer circumferential surface of the shroud, the first circumferential row positioned before the plurality of swirlers; and
a second inlet disposed along a second circumferential row (R3) of the outer circumferential surface of the shroud, the second circumferential row positioned after the circumferential row RX and positioned before the circumferential row RY, such that the second inlet is disposed in a region between the circumferential row RY and the circumferential row RX.