Abstract: A method and device for reducing emissions of nitrogen oxides and for increasing heat transfer in a fired process heater is disclosed herein. The invention relates generally to the combustion of fuel using some proportion of air as the oxidant which leads to the production of oxides of nitrogen, and more particularly to a method and device that reduces the production of nitrogen oxides from combustion, promotes the appropriate distribution of temperature to reduce fouling of the process tubes in a fired heater, and increases the efficiency of heat transfer to the same process tubes.

Abstract: A method and assembly for supplying heat in the desired pattern while suppressing the production of nitrogen oxides and carbon dioxide. The assembly includes a fluid mixture nozzle assembly in fluid communication with an external conduit and a radiant section of a fired process heater. The fluid mixture nozzle assembly includes an open mixing channel having an upstream converging section, a midstream mixing section, and a downstream diverging section for entraining a fluid mixture with vitiated flue gas combustion products. The fluid mixture nozzle assembly is installed in the wall, floor, or ceiling of the fired heater.

Abstract: The present invention relates to a process for quenching the effluent gas of a furnace comprising: a) providing a furnace comprising a radiant zone enclosure means having a plurality of tubes disposed therein, an inlet means for introducing the process fluid into the tubes, means for exposing the external surface of the tubes to radiant heat for heating said process fluid and thereby produce an effluent gas, b) providing a quench zone having a plurality of quench tubes in which the effluent gas is passed and such as the inlet of one quench tube is connected to the outlet of one or more tubes of the radiant zone, c) recovering the effluent gas after it has been cooled in the quench tubes, wherein, at least a part of the quench tubes and advantageously all the quench tubes are tubes having means inside of it, on all the length or a part of the length, to promote turbulent flow by breaking the boundary film on the internal surface of the tube.

Abstract: Disclosed is a burner tip to be used in a furnace for the combustion of fuel gas in the combustion zone of a furnace, that comprises a burner tube that has a longitudinal axis and has a dowstream end and an upstream end for receiving the fuel gas.

Abstract: A pyrolysis heater particularly for the cracking of hydrocarbons in the production of olefins has a burner arrangement in the firebox which includes staged combustion low NOx hearth burners firing upwardly in the firebox adjacent to the walls. Wall stabilizing gas fuel injection tips, located at an elevation above the hearth burners, inject fuel upwardly between the walls and the flame from the hearth burners. This prevents rollover of the flame onto the process heater coil and overheating of the coil.