Burner....not a premix -- not a nozzlemix [Archive]

Ben Rosenfield

01-30-2008, 05:44 PM

From that same Web page: Burner Dynamics’ burner utilizes a low velocity vortex generator internal to the burner which thoroughly mixes the gas fuel and combustion air on ratio immediately prior to ignition in the combustion chamber.

And this is cool too. Have a look at:

US patent 7,241,138 - Burner with stepped fuel injection

A burner comprising: at least one burner shell, wherein said at least one burner shell comprises at least two hollow part-cone bodies positioned with respect to one another to have an increasing cone inclination in a direction of flow, at least one gap therebetween, and are arranged offset with respect to one another so that combustion air flows into the interior space though the at least one gap between the part-cone bodies; fuel nozzles arranged in the at least one burner shell; an interior space surrounded by said at least one burner shell, the interior space configured and arranged for burner fuel to be injected though said fuel nozzles into a combustion air stream when flowing within the interior space, and a fuel/air mix when formed to flow, within a delay time (.tau.), to a flame front in a combustion chamber, where said fuel/air mix can be ignited; a burner base; a fuel lance having at least two fuel injection holes distributed over a length of said fuel lance, the fuel lance projecting from the burner base into the interior space substantially in the direction of the combustion chamber, though which fuel injection holes a fuel can be injected into the combustion air stream in such a manner that the delay time (.tau.) between the injection of the fuel and combustion of said fuel at the flame front is different for the at least two fuel injection holes; wherein the fuel lance is substantially cylindrical in cross section, with the at least two fuel injection holes being distributed both with regard to the length of the fuel lance and with regard to their circumferential arrangement on the fuel lance; and wherein the fuel lance comprises a central tube projecting into the interior space and including tubes which are nested coaxially inside one another, wherein pilot fuel can be supplied via a tube of said central tube having the smallest diameter, and wherein the fuel to be injected into the interior space though said fuel injection holes can be supplied via the space between the tube having the largest diameter and an adjacent tube of said central tube.