The Ducon Company, Inc.

Hri, Inc.

Other

General Electric Company

Snamprogetti

Marquess and Nell, Inc.

Frederick A Zenz

Edward C Luckenbach

James J Colyar

Andrea Bartolini

David J Nell

Allen S Li

Benjamin F Etheredge

Thierry LePalud

Giovanni Papa

A fluidized bed reactor operating under countercurrent gas-solid flow conditions wherein the reactor is supplied with horizontal baffles having separate passages through which the gas and the solid flow, such that the ascending gas leaves the baffle in a point higher than the point in which the descending solid leaves the same baffle, and the use of the reactor to perform reactions under countercurrent flow conditions while maintaining gas and solids flows of at least 70% of flooding conditions.

Fluidized bed reactor and process for performing reactions therein

A gas distribution system employing an array of parallel gas inlet pipes and a pair of transverse gas inlet pipes located below the first group of pipes to fluidize a particulate bed in a reaction vessel and to remove non-fluidizable particles that may be introduced into or form in the bed.

Gas distribution system for fluidized bed reactors

A fluidized bed combustion system and method for combusting particulate fuel such as coal together with a sorbent material such as limestone to heat a pressurized liquid and generate saturated vapor, such as steam. The combustion system utilizes at least one concentric dual-sided riser-downcomer unit having a central riser passageway and a concentric outer downcomer passageway located above a dense phase fluidized bed in an enclosure module, the downcomer being configured for directing particulate solids back to the bed. The unit inner and outer passageway surfaces each include a heat exchange panel containing the pressurized liquid for absorbing heat from combustion of the fuel and generating the vapor such as pressurized steam. Primary air is provided below the fluidized bed, while secondary air is provided into the riser passageway. The coal feed particles are substantially completely combusted during their passage through the circulating loop passages, and flue gas is passed outwardly through a cyclone separator, from which any unburned solids are returned to the fluidized bed. The resulting ash and spent limestone are withdrawn from the lower portion of the fluidized bed. Pressurized saturated steam is withdrawn from the unit, while particulates are removed from the flue gas.

Fluidized bed combustion system and method utilizing capped dual-sided

A fluid bed processing apparatus in which a series of individual fluid bed modules are arranged horizontally alongside each other in a linear or circular configuration with the bed material overflowing weirs between each module in moving from the feed stock input module to a discharge module.

Particle fractionator employing multiple fluidized bed modules

A fluidized bed gas-solids contact reactor, which utilizes at least one capped concentric dual-sided riser-downcomer unit having a central inner riser passageway and a concentric outer downcomer passageway. The riser-downcomer unit is usually located above the fluidized bed, and is adapted for directing the downflowing solids back into the fluidized bed for recycle. The reactor unit inner and outer passageway surfaces include a heat exchange panel having inner and outer channels each containing a circulating liquid. Particulate solids from the dense phase fluidized bed are continuously circulated in dilute phase through the riser-downcomer unit passageways by a reactant gas to exchange heat with the liquid. The particulate solids can be a catalyst or a fuel material. The invention also includes a combustion system and method for combusting a particulate fuel such as coal in air to generate pressurized saturated liquid for producing saturated steam. The coal feed particles are substantially completely reacted or combusted during their controlled passage through the reactor unit, and ash can be withdrawn from the lower portion of the fluidized bed.

Fludized bed reactor using capped dual-sided contact units and methods

Control of discharge of particulate solids from a pressurized vessel is attained through a downwardly directed conduit with or without the use of valves. The lower end of the conduit has a greater cross-sectional area than the upper end of the conduit. The lower end of the conduit may extend into a fluidized bed. Discharge of solids from the vessel may be controlled by controlling the height and degree of aeration of the fluidized bed.

Control of solids discharge from pressurized vessel

A mixture of powders, preferably UO.sub.2 powders, is blended to complete homogeneity in a nuclear-safe, bubbling-bed fluidized bed blender. The blender includes a generally vertically-oriented, slab-shaped, nuclear-safe mixing vessel having a fluidizing grid disposed on the bottom of the vessel. The fluidizing grid comprises a linear array of generally downwardly-directed pyramidal-shaped hoppers each having walls converging into a conically-shaped closable opening. A plurality of gas orifices is provided for directing a flow of fluidizing gas downwardly into the bottom of each of the hoppers and fluidizing gas is supplied to the orifices at a velocity sufficient to cause bubbles of fluidizing gas to rise through and emerge from the mixture of UO.sub.2 powders until a homogeneous blend of solid UO.sub.2 powders is achieved. The apparatus eliminates dead-zones normally present near the bottom of prior art fluidized bed blenders. A method is also disclosed of blending a mixture of powders which in a preferred application is a mixture of UO.sub.2 powders.

Method and apparatus for blending powders in a fluidized bed

A granular bed filter, capable of being backwashed, is disclosed without screens. The filter beds of granular material are generally U-shaped in section.

Screenless granular bed filter

Steam is generated in a controlled manner as a function of the steam demand by way of a combustor adapted to burn a fuel such as high sulfur coal in a fluidized bed. The steam demand and the steam available to supply the demand are modulated to change the rate of production of steam as a function of controlling the fluidization of fuel beds and/or the height of fuel in the beds. Any fuel beds which are slumped are maintained at a temperature slightly above the flash point temperature of the fuel.

Apparatus and method for generating steam

The filter apparatus includes a plurality of hollow filter chambers each including a filter bed whose volume greatly exceeds the volume of the granular filter material such as sand. The beds are backwashed by a steady flow of low pressure air sufficient to fluidize the beds.

Growing community of inventors

Garrison, NY, United States of America

Frederick A Zenz