Patent ID: 8387392

Claim:
A fuel injection system, comprising: a fuel injection module including a fuel injection tip, a primary fuel injector and one or more secondary fuel injectors disposed around the primary fuel injector; a rotary blower module provided at the injection tip of the fuel injection module, and including a hollow cylindrical body and guide blades disposed in the body, wherein the guide blades are obliquely directed with respect to an axial direction of the body; an air supply module which supplies air to the fuel injection module; and a fuel supply module which supplies fuel to the fuel injection module, wherein the rotary blower module is affixed to a free end of the primary fuel injector, and the guide blades of the rotary blower module encompass the free end of the primary fuel injector, wherein Dn is a diameter of the primary fuel injector, Dp is a diameter of the one or more secondary fuel injectors, D 1 ⁢ st ( D 1 ⁢ st = A ⁢ π ⁡ ( D 3 ⁢ r ⁢ ⁢ d 2 - D n 2 ) 4 ⁢ ⁢ ( A ⁢ : ⁢ 0.05 | 0.2 ) ) is a diameter of a primary air discharge region from which primary air is discharged to a space between the primary fuel injector and the rotary blower module, D 2nd D 2 ⁢ nd ( D 2 ⁢ nd = B ⁢ π ⁡ ( D 3 ⁢ r ⁢ ⁢ d 2 - D 1 ⁢ st 2 ) 4 ⁢ ⁢ ( B ⁢ : ⁢ 0.3 | 0.6 ) ) is an outer diameter of the rotary blower module, D 3 ⁢ r ⁢ ⁢ d ⁢ D 3 ⁢ ⁢ r ⁢ ⁢ d = CQ + D n 2 ⁢ ⁢ ( C ⁢ : ⁢ 0.90 * 10 - 11 ~ 7.31 * 10 - 11 ⁡ [ ( m 2 ⁢ s ) / J ] ) ) is a diameter of a secondary air discharge region from which primary air is discharged to a circumferential space between the primary fuel injector and the at least one of the one or more secondary fuel injectors, and Q (J/s) is a heat load, wherein the rotary blower module is configured such that air is obliquely supplied with respect to an axial direction of the fuel injection module, and wherein the fuel injection module serves to generate multistage flames in a burner by forming a rich fuel flame region using the primary fuel injector and forming a lean fuel flame region behind the rich fuel flame region using the secondary fuel injectors through a burning process of gasifying secondary fuel.