Method and burner assembly for combusting a fuel gas with an oxidant

A method for combusting a fuel gas with an oxidant by using a burner assembly (10) comprising a burner (12) and a lance (14), the method comprising:

• providing via the burner (12) a main gas flow to a combustion, wherein the main gas flow comprises a main part of the fuel gas and a first part of the oxidant;
• and
• providing via the lance (14) a staging gas flow to the combustion, wherein the staging gas flow comprises a second part of the oxidant and an auxiliary part of the fuel gas;
• wherein the main part of the fuel gas is larger than the auxiliary part of the fuel gas, and wherein the auxiliary part of the fuel gas provided via the lance is selected from the group consisting of not more than 20% of the total fuel gas provided to the combustion, not more than 10% of the total fuel gas provided to the combustion, not more than 5% of the total fuel gas provided to the combustion, and not more than 2% of the total fuel gas provided to the combustion.

A burner assembly (10) for combusting a fuel gas with an oxidant, the burner assembly (10) comprising:

• a burner (12) for providing a main gas flow to a combustion, wherein the main gas flow comprises a main part of the fuel gas and a first part of the oxidant;
• a lance (14) for providing a staging gas flow to the combustion, wherein the staging gas flow comprises a second part of the oxidant and an auxiliary part of the fuel gas;
• and
• an injection element for injecting the auxiliary part of the fuel gas to the second part of the oxidant before providing the staging gas flow to the combustion via the lance (14);
• wherein the main part of the fuel gas is larger than the auxiliary part of the fuel gas, and wherein the auxiliary part of the fuel gas provided via the lance is selected from the group consisting of not more than 20% of the total fuel gas provided to the combustion, not more than 10% of the total fuel gas provided to the combustion, not more than 5% of the total fuel gas provided to the combustion, and not more than 2% of the total fuel gas provided to the combustion.