Fuel lance

Abstract

A lance (3) for introducing a fuel into a mixing path (2) of a burner (1) which is provided with a swirler for producing a swirled combustion air flow, especially a burner of a turbine plant, includes a lance head (5), a fuel feed (8) and an oxidator feed (10). The lance head (5) projects into the mixing path (2), has at least one fuel nozzle (6) for injection of the fuel into the mixing path (2), and also has at least one oxidator outlet orifice (7) for introducing an oxidator into the mixing path (2). The fuel feed (8) extends in the lance (3) and is connected to the at least one fuel nozzle (6). The oxidator feed (10) extends in the lance head (5) and is connected to the at least one oxidator outlet orifice (7). In order to improve the operation of the burner (1), the at least one oxidator outlet orifice (7) is located centrally on the lance head (5), and the at least one fuel nozzle (6) is installed on the lance head (5), being offset radially outwards with regard to the at least one oxidator outlet orifice (7).

Description

[0001]This application is a Continuation of, and claims priority under 35 U.S.C. § 120 to, International application no. PCT / EP2006 / 067525, filed 18 Oct. 2006, and claims priority therethrough under 35 U.S.C. §§ 119, 365 to Swiss application no. 01769 / 05, filed 4 Nov. 2005, the entireties of which are incorporated by reference herein.BACKGROUND[0002]1. Field of Endeavor[0003]The invention relates to a lance for introducing a fuel into a combustion chamber of a burner which is provided with a swirler, especially a burner of a turbine plant.[0004]2. Brief Description of the Related Art[0005]DE 100 50 248 A1 discloses such a lance for a burner, which basically includes a swirler for producing a swirled combustion air flow and a device for introducing at least a quantity of fuel into this combustion air flow, which includes a lance head, a fuel feed, and an oxidizer / oxidator feed. The lance head in the installed state projects into the combustion chamber, has a central fuel nozzle for i...

AI Technical Summary

Benefits of technology

[0010]It has been shown that these measures lead to an improved mixture formation and to an improved combustion reaction, and, therefore, lead to reduced pollutant emissions. At the same time, however, the cooling and purging function of the centrally supplied oxidator is maintained.

[0012]Also advantageous are embodiments in which the oxidator feed has an oxidator chamber located centrally in the lance head, the end of which, which is open towards the combustion chamber, forms the oxidator outlet orifice. Furthermore, a plurality of oxidator connecting passages can be provided, which in each case connect the oxidator chamber to an oxidator inlet orifice which is located radially on the outside on the lance head. By inclusion of the oxidator chamber, a relatively large surface which is impactable by the oxidator is provided inside the lance head, which improves the cooling action of the oxidator flow.

Problems solved by technology

In larger burners of this type, therefore burners with larger output or larger fuel conversion, as the case may be, it has been shown that introducing of fuel through the lance leads to a comparatively poor mixing through, and, therefore, to relatively unfavorable combustion reactions with increased pollutant emission.

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