Method of cooling and deashing
AssigneeTexaco Development Corporation
InventorWolfgang Koog
Life of this patent
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Abstract
Hot synthesis gas is cooled and deashed by passage through first zone in contact with a downwardly descending film of cooling liquid, a second zone in contact with a spray of cooling liquid, a third zone in contact with a body of cooling liquid, and a fourth zone in contact with a spray of cooling liquid--at least a portion of the cooling liquid to the first zone preferably being recycled cooling liquid from which at least a portion of the solids contained therein has been removed.
Claims8
The method of cooling a hot synthesis gas which comprises
- passing hot synthesis gas at initial temperature downwardly through a first contacting zone in a quench chamber;
- passing cooling liquid downwardly as a film on the walls of said first contacting zone and a contact with said downwardly descending synthesis gas thereby cooling said synthesis gas and forming a cooled synthesis gas;
- passing said cooled synthesis gas downwardly through a second contacting zone in said quench chamber in contact with a downwardly descending film on the walls of said second contacting zone;
- spraying cooling liquid into said downwardly descending cooled synthesis gas in said second contacting zone thereby forming a downwardly descending further cooled synthesis gas;
- passing said further cooled synthesis gas into a body of cooling liquid in a third contacting zone in said quench chamber thereby forming a further cooled synthesis gas containing a decreased solids content;
- passing said further cooled synthesis gas containing a decreased solids content into contact with a sprayed stream of cooling liquid in a fourth contacting zone in said quench chamber thereby forming a cooled product synthesis gas;
- and
- recovering said cooled product synthesis gas.
The method of cooling from an initial high temperature of 1800.degree.-3500.degree. F. to a lower final temperature of about 400.degree.-700.degree. F., a hot synthesis gas containing solid particles including ash and char which comprises
- passing hot synthesis gas containing ash and char at initial hot temperature downwardly through a first contacting zone in a quench chamber;
- passing cooling liquid, containing less than about 0.1 w % of solid particles having a particle size larger than about 100 microns, into said first contacting zone;
- passing said hot synthesis gas through said first contacting zone in the presence of a falling film of cooling liquid passing downwardly on the walls of said contacting zone thereby forming a cooled synthesis gas;
- passing said cooled synthesis gas downwardly through a second contacting zone in said quench chamber in contact with a downwardly descending film on the walls of said second contacting zone;
- spraying cooling liquid into said downwardly descending cooled synthesis gas in said second contacting zone thereby forming a further cooled synthesis gas containing a decreased solids content;
- passing said cooled synthesis gas into contact with a body of cooling liquid in said quench chamber thereby forming a cooled product synthesis gas containing a decreased content of solid particles;
- then
- contacting said cooled product synthesis gas with a spray of aqueous scrubbing liquid in said quench chamber thereby forming a product synthesis gas substantially free of solids and a scrubber liquid effluent containing solid particles;
- separating at least a portion of said solid particles from at least a portion of said scrubber liquid effluent containing solid particles thereby forming a liquid containing less than about 0.1 w % of solid particles having a particle size larger than about 100 microns;
- and
- passing at least a portion of said liquid containing less than about 0.1 w % of solid particles having a particle size larger than about 100 microns as at least a portion of said cooling liquid to said contacting zone.
Dependencies are inferred from the claim text.