Low polluting emission gas burner

A combustible gas burner comprising:

• a main metal body open at a first base end, having a housing for a combustible gas distributor at a second base end and internally lined with a coating of refractory material, and having a volume inside said coating that defines a plenum,
• an inner central lance for combustible gas arranged inside said main metal body,
• at least two outer side lances for combustible gas which are disposed within said main metal body, said at least two outer side lances being arranged radially outwardly with respect to said inner central lance,
• a single duct for the introduction of pre-heated air into said plenum where said single duct is connected to a side surface of said main metal body, said single duct being adapted to bring air into said plenum,
• said gas distributor associated to said housing for distributing combustible gas to said inner central lance and to said outer side lances,
• a combustible gas control system for said gas distributor,
• a refractory unit associated with said first base end,
• characterized in that
• said refractory unit comprises, in sequence from the innermost to the outermost, a first region, a second annular region and a third annular region which are concentric to said inner central lance, wherein
• said first region comprises a central hole from which the combustible gas flows out and which houses a tip portion of said inner central lance and a series of calibrated holes communicating with said plenum and with a cavity that is defined in said first region and communicates with the combustion chamber of an oven, the pre-heated air from said series of calibrated holes flowing into said cavity together with the gas injected through said inner central lance, said calibrated holes being positioned between said central hole and said nozzles,
• said second annular region comprising a series of nozzles communicating with said plenum for the injection of the pre-heated air into said combustion chamber of an oven and
• said third annular region comprising at least two pass-through holes for housing said at least two outer side lances
• both said series of calibrated holes and said series of nozzles being in communication with said plenum and being located between the inner central lance and the outer side lances, and in that,
• said combustible gas distributor and control system comprise means for varying a distribution percentage of the combustible gas between the inner central lance and the outer side lances thereby continuously switching from a flame functioning mode of the burner, wherein the combustible gas is injected into said combustion chamber through said inner central lance alone, to a flameless functioning mode, wherein the combustible gas is injected into said combustion chamber through said outer lances, wherein the total outflow section of air from the series of calibrated holes with respect to the total outflow section of air from the series of nozzles has a ratio ranging from 0.01 to 0.9.

A combustible gas burner comprising:

• a main metal body open at a first base end, having a housing for a combustible gas distributor at a second base end and internally lined with a coating of refractory material and having a volume inside said coating that defines a plenum,
• an inner central lance for combustible gas arranged inside said main metal body,
• at least two outer side lances for combustible gas which are disposed within said main metal body, said at least two outer side lances being arranged radially outwardly with respect to said inner central lance,
• a single duct for the introduction of pre-heated air into said plenum where said single duct is connected to a side surface of said main metal body, said single duct being adapted to bring air into said plenum,
• said gas distributor associated to said housing for distributing combustible gas to said inner central lance and to said outer side lances,
• a combustible gas control system for said gas distributor,
• a refractory unit associated with said first base end,
• characterized in that
• said refractory unit comprises, in sequence from the innermost to the outermost, a first region, a second annular region and a third annular region which are concentric to said inner central lance, wherein
• said first region comprises a central hole from which the combustible gas flows out and which houses a tip portion of said inner central lance and a series of calibrated holes communicating with said plenum and with a cavity that is defined in said first region and communicates with the combustion chamber of an oven, the pre heated air from said series of calibrated holes flowing into said cavity together with the gas injected through said inner central lance said calibrated holes being positioned between said central hole and said nozzles,
• said second annular region comprising a series of nozzles communicating with said plenum for the injection of the pre-heated air into said combustion chamber of an oven and
• said third annular region comprising at least two pass-through holes for housing said at least two outer side lances
• both said series of calibrated holes and said series of nozzles being in communication with said plenum and being located between the inner central lance and the outer side lances, and in that,
• said combustible gas distributor and control system comprise means for varying a distribution percentage of the combustible gas between the inner central lance and the outer side lances,
• activation means of said control system being provided to thereby continuously switching from a flame functioning mode of the burner, wherein the combustible gas is injected into said combustion chamber through said inner central lance alone, to a flameless functioning mode, wherein the combustible gas is injected into said combustion chamber through said outer side lances alone wherein the total outflow section of air from the series of calibrated holes with respect to the total outflow section of air from the series of nozzles has a ratio ranging from 0.01 to 0.9.

A combustible gas burner comprising:

• a main metal body open at a first base end, having a housing for a combustible gas distributor at a second base end and internally lined with a coating of refractory material, and having a volume inside said coating that defines a plenum,
• an inner central lance for combustible gas arranged inside said main metal body,
• at least two outer side lances for combustible gas which are disposed within said main metal body, said at least two outer side lances being arranged radially outwardly with respect to said inner central lance,
• a single duct for the introduction of pre-heated air into said plenum where said single duct is connected to a side surface of said main metal body, said single duct being adapted to bring air into said plenum,
• said gas distributor associated to said housing for distributing combustible gas to said inner central lance and to said outer side lances,
• a combustible gas control system for said gas distributor,
• a refractory unit associated with said first base end,
• characterized in that
• said refractory unit comprises, in sequence from the innermost to the outermost, a first region, a second annular region and a third annular region which are concentric to said inner central lance, wherein
• said first region comprises a central hole from which the combustible gas flows out and which houses a tip portion of said inner central lance, a series of calibrated holes communicating with said plenum and with a cavity that is defined in said first region and communicates with the combustion chamber of an oven, the pre-heated air from said series of calibrated holes flowing into said cavity together with the gas injected through said inner central lance, a housing that houses an ignition device and a housing that houses a flame detector device said calibrated holes being positioned between said central hole and said nozzles;
• said second annular region comprising a series of nozzles communicating with said plenum for the injection of the pre-heated air into said combustion chamber of an oven and
• said third annular region comprising at least two pass-through holes for housing said at least two outer side lances
• both said series of calibrated holes and said series of nozzles being in communication with said plenum and being located between the inner central lance and the outer side lances, and in that,
• said combustible gas distributor and control system comprise means for varying a distribution percentage of the combustible gas between the inner central lance and the outer side lances,
• activation means of said control system being provided to thereby continuously switching from a flame functioning mode of the burner, wherein the combustible gas is injected into said combustion chamber through said inner central lance alone and the combustion of said combustible gas with the pre-heated air drawn through said series of calibrated holes takes place in a flame mode, upon ignition of said ignition device, to a flameless functioning mode, wherein, at a temperature above the self-ignition device of the gas in air the combustible gas is injected into said combustion chamber through said outer side lances alone and the combustion of said gas with the pre-heated air drawn through said series of calibrated holes and said series of nozzles takes place in a flameless mode inside said combustion chamber wherein the total outflow section of air from the series of calibrated holes with respect to the total outflow section of air from the series of nozzles has a ratio ranging from 0.01 to 0.9.