Patent ID: 6532726
Filing Date: 2003-03-18
Classification: F23C,F23D,F23R

Abstract:
A gas-turbine engine combustion system of the lean-burn type, comprising:a) a combustor including a burner; b) a combustion pre-chamber; c) a combustion main chamber disposed in flow series along a longitudinal axis; d) the burner including: i) a burner head, ii) a burner face of the burner head, the burner face defining an upstream extremity of the pre-chamber, iii) a radial swirler disposed between the burner face and the pre-chamber, iv) gas-fuel injection means for injecting gas-fuel from the burner head into the pre-chamber, and v) liquid-fuel injection means separate from the gas-fuel injection means for injecting liquid-fuel from the burner head into the pre-chamber; e) the swirler having a plurality of passages for the flow of combustion air through the swirler towards a central part of the burner face; f) the combustion system comprising: an arrangement for enabling changeover from gas-fuel operation of the combustor to liquid-fuel operation of the combustor, and operable during the liquid-fuel operation of the combustor to prevent injection of the gas-fuel and enable injection of cooling air from the burner head into the prechamber; and g) the burner further including directing means for direction the gas-fuel towards the central part of the burner face during the gas-fuel operation of the combustor, and for directing the cooling air towards the central part of the burner face during the liquid-fuel operation of the combustor.