Lummus Technology Inc.

Exxon Research and Engineering Company

Abb Lummus Global Inc.

Peter Robert Ponzi

Robert J Gartside

Francesco Bertola

Paul John Chapman

Ramesh R Hemrajani

Erwin M J Platvoet

Frank McCarthy

Frank D McCarthy

Paul Chapman

Robert John Gartside

Disclosed herein is a method of controlling the air to fuel ratio in a burner containing a venturi assembly. The venturi includes an air inlet, a primary fuel inlet with a converging section, a throat portion downstream from the converging section, a diverging section downstream from the throat portion, an outlet, and a secondary gas inlet disposed downstream from the converging section and upstream from the outlet. The method comprises introducing fuel into the fuel inlet, receiving air through the air inlet by inspiration, and feeding a gas through the secondary gas inlet, the flow rate and content of the gas fed through the secondary gas inlet being selected to result in a desired air to fuel ratio through the outlet. A method of firing a heater, a burner, a furnace and firing control systems also are disclosed.

Method, system and apparatus for firing control

A furnace, firing pattern and method of operating a heater that employs a combination of hearth burners and wall burners for the cracking of hydrocarbons is described. The firing pattern leads to improvements in the uniformity of the coil metal temperatures and vertical heat flux profiles over the firebox elevation. The hearth burners operate with a stoichiometric excess of air while the wall burners operate with less than the stoichiometric amount of air.

Heater and method of operation

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 NOhearth 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.

Pyrolysis heater

The present invention is directed toward the dampening of concentration variations in fluid streams, especially concentration variations that are substantially sinusoidal, by subjecting such streams to a plurality of backmixing steps whereby such concentration variations are reduced. In one embodiment of the present invention, there is provided a surge drum that is divided into a predetermined number of mixing stages, each of which is provided with means to create a fluid jet stream at substantially the inlet of the mixing stage and baffle means positioned with respect to the inlet jet for reversing the flow of the jet.

Surge drum internals design for damping of sinusoidal variations in the

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Randolph, NJ, United States of America

Peter Robert Ponzi