Method for reducing NOX emission
AssigneeTechnip France
InventorsIzaak Jacobus Risseeuw, Johannes Antonie de Jager, Jelle-Gerard Wijnja
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Abstract
The invention is directed to a method for reducing NOx emission from an industrial process furnace comprising a firebox containing a burner and a tube, which method comprises subjecting an oxidant gas and/or a fuel gas (1) to humidification, thereby obtaining a humidified gas; and pre-heating the humidified gas with an external waste heat stream (20) before feeding the gas to the burner.
Claims23
A method for reducing NOx, emission from a process furnace comprising a firebox containing a burner and a tube, the method comprising:
- subjecting an oxidant gas and/or a fuel gas to humidification, thereby obtaining a humidified gas;
- and
- superheating the humidified gas with an external waste heat stream and thereafter feeding the superheated, humidified gas to the burner, wherein the external waste heat stream has a temperature in the range of 40-100° C., wherein the temperature of the humidified gas in the superheating step is increased by at least 10° C.
A method for combusting fuel gas with oxidant gas in a process furnace comprising a firebox containing a burner and a tube, the method comprising:
- subjecting an oxidant gas and/or the fuel gas to humidification, thereby obtaining a humidified gas;
- and
- superheating the humidified gas with an external waste heat stream and thereafter feeding the superheated, humidified gas to the burner, wherein the external waste heat stream has a temperature in the range of 40-100° C., wherein the temperature of the humidified gas in the superheating step is increased by at least 10° C., wherein the humidification step results in a humidified gas of 20-50° C., wherein the humidified gas is superheated to a temperature of 40-75° C.
A method for heating a tube to a temperature above 500° C. in a process furnace comprising a firebox containing a burner and the tube, the method comprising:
- subjecting an oxidant gas and/or a fuel gas to humidification, thereby obtaining a humidified gas;
- and
- superheating the humidified gas with an external waste heat stream and thereafter feeding the superheated, humidified gas to the burner, wherein the external waste heat stream has a temperature in the range of 40-100° C., wherein the temperature of the humidified gas in the superheating step is increased by at least 10° C.
Dependencies are inferred from the claim text.