US 12,264,820 B1
Multi-stage micro-decomposition swirl burner with an ammonia-doped fuel and low NOx control method
Shuiqing Li, Beijing (CN); Tong Si, Beijing (CN); Peng Ma, Beijing (CN); Yuanping Yang, Beijing (CN); and Xiang Wang, Beijing (CN)
Assigned to Tsinghua University, Beijing (CN)
Filed by Tsinghua University, Beijing (CN)
Filed on Sep. 24, 2024, as Appl. No. 18/894,458.
Claims priority of application No. 202311560842.8 (CN), filed on Nov. 21, 2023.
Int. Cl. F23R 3/14 (2006.01); F02C 3/22 (2006.01); F23R 3/28 (2006.01); F23R 3/34 (2006.01)
CPC F23R 3/14 (2013.01) [F23R 3/286 (2013.01); F23R 3/343 (2013.01); F02C 3/22 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multi-stage micro-decomposition swirl burner with an ammonia-doped fuel, comprising a natural gas central pipe (1), a primary air pipe (2), and a burner housing (3) which are nested from inside to outside in sequence, wherein a primary air duct (4) is formed between an outer wall of the natural gas central pipe (1) and an inner wall of the primary air pipe (2), and an over-fire air channel (5) is formed between an outer wall of the primary air pipe (2) and an inner wall of the burner housing (3);
an ignition device (6) and swirl vanes (7) are arranged in the primary air duct (4), the swirl vanes (7) are installed at a periphery of an outlet end of the natural gas central pipe (1), and configured to enable primary air in the primary air duct (4) to be mixed with a natural gas ejected from the outlet end of the natural gas central pipe (1) in a swirling state, the ignition device (6) is configured to ignite a mixture of the primary air and the natural gas to form a pilot flame with sustainable combustion at the outlet end of the natural gas central pipe (1); and
fuel distribution nozzles (8) are arranged in the over-fire air channel (5), and the fuel distribution nozzles (8) are arranged adjacent to the outlet end of the natural gas central pipe (1); several micro-decomposition holes (81) are formed at an outlet end of each of the fuel distribution nozzles (8) to eject the ammonia-doped fuel at a high speed, so as to enable ammonia in the ammonia-doped fuel to be burned under an action of the pilot flame, and enable a negative pressure to be formed at a port of the over-fire air channel (5) when the ammonia-doped fuel is ejected at a high speed, to entrain over-fire air formed by burning the ammonia-doped fuel.