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Swozzle based burner tube premixer including inlet air conditioner for low emissions combustion

United States Patent

August 27, 2002
View the Complete Patent at the US Patent & Trademark Office
A burner for use in a combustion system of a heavy-duty industrial gas turbine includes a fuel/air premixer having an air inlet, a fuel inlet, and an annular mixing passage. The fuel/air premixer mixes fuel and air into a uniform mixture for injection into a combustor reaction zone. The burner also includes an inlet flow conditioner disposed at the air inlet of the fuel/air premixer for controlling a radial and circumferential distribution of incoming air. The pattern of perforations in the inlet flow conditioner is designed such that a uniform air flow distribution is produced at the swirler inlet annulus in both the radial and circumference directions. The premixer includes a swozzle assembly having a series of preferably air foil shaped turning vanes that impart swirl to the airflow entering via the inlet flow conditioner. Each air foil contains internal fuel flow passages that introduce natural gas fuel into the air stream via fuel metering holes that pass through the walls of the air foil shaped turning vanes. By injecting fuel in this manner, an aerodynamically clean flow field is maintained throughout the premixer. By injecting fuel via two separate passages, the fuel/air mixture strength distribution can be controlled in the radial direction to obtain optimum radial concentration profiles for control of emissions, lean blow outs, and combustion driven dynamic pressure activity as machine and combustor load are varied.
Tuthill; Richard Sterling (Bolton, CT), Bechtel, II; William Theodore (Scotia, NY), Benoit; Jeffrey Arthur (Scotia, NY), Black; Stephen Hugh (Duanesburg, NY), Bland; Robert James (Clifton Park, NY), DeLeonardo; Guy Wayne (Scotia, NY), Meyer; Stefan Martin (Troy, NY), Taura; Joseph Charles (Clifton Park, NY), Battaglioli; John Luigi (Glenville, NY)
General Electric Company (Schenectady, NY)
09/ 811,764
March 20, 2001
This invention was made with Government support under Contract No. DE-FC21-95MC-31176 awarded by the Department of Energy. The Government has certain rights in this invention.