Process and apparatus for the removal of dust in a reaction zone
AssigneeHaldor Topsoe A/S
InventorTroels Dahlgaard Stummann
Life of this patent
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Abstract
A process for treating a dust containing, gaseous or liquid feed stream in a reactor containing a plurality of particle beds, which have the capability, once the pressure drop across a bed has reached a maximum allowable level, to distribute most of the feed stream to a point directly upstream of each of the subsequent beds in a series, stepwise manner. The beds contain particles in the form of pellets, cylinders, granules, rings, or mixtures thereof, and at the end of an operation period, the primary fraction of the feed flow is directed through the downstream-most bed in the reactor. By providing for removal of dust in each of the beds, the process enables the reactor to operate with a conventional pressure drop profile, but for an extended on-stream period of time.
Claims7
A process for treating a dust containing feed stream in a reaction zone loaded with particles, of which at least a part is active in the reaction of the stream, wherein dedusting of the feed stream is performed in the reaction zone simultaneously with reactions proceeding therein and the particles are loaded into a series of beds, numbered nb, the process comprising the steps of:
- (a) arranging the particles in the series of beds, numbered nb;
- (b) during a first period of time equal to the time necessary for the pressure drop across bed n1 to rise from an initial value to a final value, passing the main part of the feed stream through all of the beds;
- (c) during a second period of time equal to the time necessary for the pressure drop across bed n2 to rise from an initial value to a final value, bypassing the bed in which the dust has been deposited during the first period of time by the main part of the feed stream;
- (d) during a number of further periods of time nt, wherein nt≦(nb−2), sequentially bypassing a number of beds, on which dust has been deposited, by the main part of the feed stream, and passing the main part of the dust containing feed stream during the last period of time through a last number of beds, nbmin≧1, containing active particles;
- and
- (e) withdrawing a treated feed stream.
Dependencies are inferred from the claim text.