US 12,066,184 B2
Low-NOx air heating swirl burner
Senwei Dai, Jiangsu (CN); Renquan Sun, Jiangsu (CN); Zhuanbo Ren, Jiangsu (CN); Liangyan Sun, Jiangsu (CN); and Hongxing Sun, Jiangsu (CN)
Assigned to ANDERSON THERMAL SOLUTIONS (SUZHOU) CO., LTD., Jiangsu (CN)
Appl. No. 17/427,007
Filed by ANDERSON THERMAL SOLUTIONS (SUZHOU) CO., LTD., Jiangsu (CN)
PCT Filed Nov. 20, 2019, PCT No. PCT/CN2019/119665
§ 371(c)(1), (2) Date Jul. 29, 2021,
PCT Pub. No. WO2021/051635, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 201910884246.2 (CN), filed on Sep. 18, 2019; and application No. 201921556338.X (CN), filed on Sep. 18, 2019.
Prior Publication US 2022/0065444 A1, Mar. 3, 2022
Int. Cl. F23D 14/70 (2006.01); F23D 14/24 (2006.01)
CPC F23D 14/70 (2013.01) [F23D 14/24 (2013.01); F23D 2900/14 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A low NOX air heating swirl burner, comprising at least one burner unit, the at least one burner unit comprising:
a combustion air duct for providing combustion air and connected to a combustion fan through a duct;
a fuel gas supply pipeline for supplying gaseous fuel;
a combustion nozzle disposed at an air outlet of the combustion air duct and connected to the fuel gas supply pipeline;
a fire protection baffle that covers the air outlet of the combustion air duct, and comprises a fin and a base plate for generating swirl combustion air; the combustion nozzle is mounted at a center of the base plate, and a gas outlet of the combustion nozzle is located on an air outlet side of the base plate; the base plate is provided with a plurality of elongated holes and air guide blades disposed obliquely on air outlet sides of the elongated holes; the plurality of elongated holes are distributed in a circumferential array by taking a center of the combustion nozzle as a circle center, and a length of each of the elongated holes is distributed in a radial direction or diagonally extended from an end near the circle center to an end away from the circle center; the fin is extended obliquely outward from an edge of the base plate in an outward expanding manner along an air outlet direction,
wherein the combustion nozzle comprises a nozzle, a cylindrical flame retaining cup, and a flame retaining cup base extended from an outer wall of the nozzle to an inner wall of the flame retaining cup, and
wherein the nozzle comprises a small hole-diameter portion at a head end thereof and a large hole-diameter portion communicated with the small hole-diameter portion; a diameter of a vent hole of the large hole-diameter portion is larger than that of a vent hole of the small hole-diameter portion; an end face of the head end of the nozzle is provided with a concave groove, and two side walls of the groove are along two parallel tangent lines of the vent hole of the small hole-diameter portion; and two ends of the groove are disposed to penetrate through an outer wall of a top of the nozzle.