Apparatus and process for controlling fluidized beds
AssigneeInstitute of Gas Technology
InventorsAmirali G. Rehmat, Jitendra G. Patel
Life of this patent
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Abstract
An apparatus and process for control and maintenance of fluidized beds under non-steady state conditions. An ash removal conduit is provided for removing solid particulates from a fluidized bed separate from an ash discharge conduit in the lower portion of the grate supporting such a bed. The apparatus and process of this invention is particularly suitable for use in ash agglomerating fluidized beds and provides control of the fluidized bed before ash agglomeration is initiated and during upset conditions resulting in stable, sinter-free fluidized bed maintenance.
Claims17
A process for maintaining fluidization during non-steady state operating conditions of a fluidized bed comprising solid carbonaceous materials for oxidation or gasification reactions comprising the steps:
- measuring the ash content relative to carbon content of fluidized solid carbonaceous materials within said fluidized bed;
- opening ash removal valve means in an ash removal conduit when said ash content measurement exceeds a first predetermined amount which is above a suitable ratio of ash to carbon and below the ash content at which sintering takes place and removing solid particulates comprising ash from said fluidized bed through said removal conduit while maintaining said solid carbonaceous material input;
- and continuing measurement of ash content within said fluidized bed and closing said ash removal valve means when said continuing measurement of ash content is reduced to a second predetermined amount which is below said suitable ratio of ash to carbon, providing controlled fluidization of said fluidized bed.
In a process for controlling ash content in a fluidized bed comprising solid carbonaceous materials undergoing oxidation or gasification during non-steady state operating conditions the improvement comprising the steps:
- measuring the ash content relative to carbon content of fluidized solid carbonaceous materials within said fluidized bed;
- opening ash removal valve means in an ash removal conduit when said ash content measurement exceeds a first predetermined amount which is above a suitable ratio of ash to carbon and below the ash content at which sintering takes place and removing solid particulates comprising ash from said fluidized bed through said removal conduit while maintaining said solid carbonaceous material input;
- continuing measurement of ash content within said fluidized bed and closing said ash removal valve means when said continuing measurement of ash content is reduced to a second predetermined amount which is below said suitable ratio of ash to carbon, providing controlled ash content of said fluidized bed.
Dependencies are inferred from the claim text.