Foster Wheeler Energy Corporation

Foster Wheeler Development Corporation

Thomas E Taylor

Richard W Bryers

Robert D Stewart

A method and system for controlling the cyclone collection efficiency and recycle rate in a fluidized bed reactor in which air is introduced into the cyclone separator in a direction opposite to that of the flow of the flue gases and entrained solids. The air entrains a portion of the fine solids and passes same through the separator and to a heat recovery area to reduce the solid inventory reduction as needed.

Method and system for controlling cyclone collection efficiency and

A fluidized bed heat exchanger having a perforated support plate supporting relatively lightweight absorbent material particles and relatively heavy fuel ash particles includes a drain through which a flow of air defining a separating air screen retains the adsorbent material particles in the bed but allows the fuel ash particles to fall into the drain.

Fluidized bed heat exchanger having separating drain and method of

A fluidized bed heat exchanger in which a perforated plate is disposed within a housing for supporting a bed of particulate material. Air is passed through the plate to fluidize the particulate material and nozzles are provided for distributing air across the inlet end of a drain pipe for the spent particulate material to insure a continuous draining of the material.

Fluidized bed heat exchanger having an air assisted bed drain

Apparatus and method for the reduction of nitrogen oxides (NOx) in the emissions of a fuel burning fluidized bed combustion system. Using a staged combustion technique, an overfire air inlet is provided in the freeboard zone above the bed. In the first stage, residual oxygen (O.sub.2) in the off-gas just above the bed is held in the 0.4 to 0.8% range by the actual coal and air rates. In the second stage, carbon monoxide (CO) and unburned hydrocarbons, both present in the first stage off-gas, are combined with additional air using the overfire air inlet. CO levels in the final effluent are reduced with little or no increase in NOx emissions.

Apparatus and method for reduction of NOx emissions from a fluid bed

An apparatus and method for supporting and starting up a fluidized bed in which a grate is disposed in a housing for receiving a single bed of particulate material, portions of which are combustible. The interior of the housing below the grate is divided into a plurality of compartments, and an air damper is disposed in each for selectively controlling the flow of air through the compartments and through the respective portions of the grate to selectively fluidize the corresponding portions of the bed of particulate material. A start-up burner is provided for igniting that portion of the combustible portion of the bed of particulate material extending above one of the compartments and additional combustible particulate material is selectively supplied to the portions of the bed.

Fluidized bed start-up apparatus and method

A method of agglomerating solid particulate waste material includes heating and fluidizing a bed of non-combustible granular material, the temperature being lower than the melting temperature of the granular material and the fluidization being accomplished by passing a gas through the granular material. A slurry containing the material to be agglomerated is introduced into the bed. The combustible material in the slurry is partially oxidized by means of heat generated by fuel combined with material in the slurry for drying and agglomerating said material and the dried and agglomerated material is removed from the bed. The apparatus includes a combustion chamber, a bed of non-combustible granular material in the chamber, circulating means for passing a gas through the bed, and heating means for heating and maintaining the bed at an elevated temperature. Introducing means is provided for introducing the solid particulate waste material into the bed in the form of a slurry, the waste material being dried and agglomerated through partial oxidization by means of heat generated by fuel combined with the waste material. Removal means is provided for removing the dried and agglomerated waste material from the combustion chamber.

Method and apparatus for agglomerating solid non-combustible waste

A coal feed system for use in a fluidized bed in which a grate is supported in a housing and is adapted to receive, on its upper surface, a bed of particulate material including a combustible fuel. Air is passed through the grate and into the bed to fluidize the particulate material. The particulate fuel material is separated externally of the bed into a relatively coarse material which is distributed over the upper surface of the bed and a relatively fine material which is distributed into the bed below the upper surface.

Coal feed system for a fluidized bed combustor

An apparatus for supporting and starting up a fluidized bed in which a grate is disposed in a housing for receiving a single bed of particulate material, portions of which are combustible. The interior of the housing below the grate is divided into a plurality of compartments, and an air damper is disposed in each for selectively controlling the flow of air through the compartments and through the respective portions of the grate to selectively fluidize the corresponding portions of the bed of particulate material. A start-up burner is provided for igniting that portion of the combustible portion of the bed of particulate material extending above one of the compartments and additional combustible particulate material is selectively supplied to the portions of the bed.

Fluidized bed start-up apparatus

A steam generator in which a high-velocity, combustion-supporting gas is passed through a bed of particulate material to provide a fluidized bed having a dense-phase portion and an entrained-phase portion for the combustion of fuel material. A first set of heat transfer elements connected to a steam drum is vertically disposed above the dense-phase fluidized bed to form a first flow circuit for heat transfer fluid which is heated primarily by the entrained-phase fluidized bed. A second set of heat transfer elements connected to the steam drum and forming the wall structure of the furnace provides a second flow circuit for the heat transfer fluid, the lower portion of which is heated by the dense-phase fluidized bed and the upper portion by the entrained-phase fluidized bed.

Growing community of inventors

Bergenfield, NJ, United States of America

Thomas E Taylor