Foster Wheeler Energy Corporation

Foster Wheeler Development Corporation

Robert Edward Froehlich

Reginald A Baldini

A system for feeding a coal-water paste material coaxially upwardly through a feed nozzle assembly into a pressurized fluidized bed reactor having a lower portion and a larger diameter upper portion. The feed nozzle assembly includes a nozzle unit for atomizing the coal paste feed material, and a concentric outer shroud tube enclosing the nozzle unit. The feed nozzle assembly is inserted upwardly through an opening in the bottom portion of the pressurized fluidized bed reactor into a coaxial orientation with the bed, so as to provide substantially complete combustion and/or carbonization of the coal paste material fed into the reactor to produce a combustible gas product. If desired, a sorbent material nay be fed into the fluidized bed together with the coal paste feed, so as to absorb sulfur from the coal and produce a clean fuel gas. During reactor operations at 130-200 psig pressure and 1,600.degree.-1,800.degree. F. temperature, at hot zone is advantageously formed just above the nozzle assembly exit end which produces rapid dehydration and passivation prior to combustion of the coal with minimal agglomeration to produce a fuel gas product.

Coaxial coal water paste feed system for gasification reactor

A process and process plant for the manufacture of ammonium nitrate using urea process tail gas are provided. Water is reacted with nitrogen dioxide to form nitric acid, which is thereafter reacted with the urea process tail gas to yield an aqueous solution and a tail gas including carbon dioxide, ammonia and water vapor, A carrier gas is added to the tail gas, in order to control the amount of water vapor condensed out of the tail gas upon its being cooled to approximately 60 degrees C. Condensed water vapor is removed and passed to an absorption tower for use in the formation of the nitric acid, while the remainder of the cooled resultant stream is passed to the atmosphere.

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New Providence, NJ, United States of America

Robert Edward Froehlich