Method of reducing CO and NOx emissions in a heating appliance and a respective appliance

A method of combustion of a gaseous fuel in a heating appliance provided with at least one burner, said method comprising:

• mixing said gaseous fuel with a preestablished quantity of air to obtain an air-fuel mixture, supplying said mixture to said at least one burner, causing said mixture to pass through openings provided in a diffuser of said at least one burner, generating flames causing the combustion of said mixture, and limiting an inflow of air from the outside of said appliance into a region directly surrounding said flames, said limiting being obtained through gaseous barrier means, wherein said gaseous barrier means is obtained through natural circulation of gaseous means.

A heating appliance comprising at least one burner fed with a mixture of gaseous fuel and air, said at least one burner being provided with a diffuser having openings through which said mixture passes and with combustion means to cause the combustion of said mixture and the formation of flames, said heating appliance comprising heat irradiating means which are so shaped and arranged as to irradiate heat towards said flames and a region directly surrounding said flames, said at least one burner generating bladed flames, said heating appliance further comprising barrier means for limiting an inflow of air from the outside into said heating appliance in a region directly surrounding said flames, wherein said barrier means comprises upward converging lower wall portions of a combustion chamber defined at the inside of a casing of the heating appliance, said at least one burner being arranged below said lower wall portions, sealing means being arranged between said lower wall portions and said at least one burner, said lower wall portions defining at least one passage for said mixture of gas fuel and air.

A heating appliance comprising at least one burner fed with a mixture of gaseous fuel and air, said at least one burner being provided with a diffuser having openings through which said mixture passes and with combustion means to cause the combustion of said mixture and the formation of flames, said heating appliance comprising heat irradiating means which are so shaped and arranged as to irradiate heat towards said flames and a region directly surrounding said flames, said at least one burner generating bladed flames, said heating appliance further comprising barrier means for limiting an inflow of air from the outside into said heating appliance in a region directly surrounding said flames, wherein said barrier means comprises gaseous barrier means.

A heating appliance comprising at least one burner fed with a mixture of gaseous fuel and air, said at least one burner being provided with a diffuser having openings through which said mixture passes and with combustion means to cause the combustion of said mixture and the formation of flames, said heating appliance further comprising barrier means for limiting an inflow of air from the outside into said heating appliance in a region directly surrounding said flames, said barrier means comprising gaseous barrier means, wherein said gaseous barrier means is obtained through natural circulation of gaseous means.

A method of combustion of a gaseous fuel in a heating appliance provided with at least one burner, said method comprising:

• mixing said gaseous fuel with a preestablished quantity of air to obtain an air-fuel mixture, supplying said mixture to said at least one burner, causing said mixture to pass through openings provided in a diffuser of said at least one burner, generating flames causing the combustion of said mixture, wherein for reducing CO and NO2 emissions it further comprises limiting an inflow of air from the outside of said appliance into a region directly surrounding said flames, said limiting being obtained by physical barrier means arranged in the vicinity of said region.

A heating appliance comprising at least one burner fed with a mixture of gaseous fuel and air, said at least one burner being provided with a diffuser having openings through which said mixture passes and with combustion means to cause the combustion of said mixture and the formation of flames, wherein said heating appliance for reducing CO and NO2 emissions comprises physical barrier means so shaped and arranged as to limit the inflow of air from the outside of said appliance into a region surrounding said flames.

A heating appliance according to 46, wherein said heat irradiating means are arranged close to the surface of said diffuser substantially through that portion of diffuser provided with said openings.