# US 4,474,584 A · Method of cooling and deashing

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- Number: US 4,474,584 A
- Document ID: US4474584A
- Status: Granted
- Kind: A
- Application number: 06/500,492
- Filed: 1983-06-02
- Granted: 1984-10-02
- Earliest claimed: 1983-06-02
- Assignees: Texaco Development Corporation
- Inventors: Wolfgang Koog
- Web page: https://patentgrep.com/patent/US4474584A

## CPC

- C10J 3/845: {Quench rings}
- C10J 3/485: {Entrained flow gasifiers}
- C10J 3/526: {for entrained flow gasifiers}
- C10J 3/74: Construction of shells or jackets
- C10J 3/78: High-pressure apparatus
- C10K 1/08: by washing with liquids; Reviving the used wash liquors (gas washers B01D)
- C10K 1/10: with aqueous liquids {(alkaline reacting aqueous liquids C10K1/12)}
- C10K 1/101: {with water only}
- C10J 2300/093: Coal
- C10J 2300/0933: Coal fines for producing water gas
- C10J 2300/0943: Coke
- C10J 2300/0946: Waste, e.g. MSW, tires, glass, tar sand, peat, paper, lignite, oil shale
- C10J 2300/0956: Air or oxygen enriched air
- C10J 2300/0959: Oxygen
- C10J 2300/0973: Water
- Y10S 48/02: Slagging producer
- C10J: PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES (synthesis gas from liquid or gaseous hydrocarbons C01B; underground gasification of minerals E21B43/295); CARBURETTING AIR OR OTHER GASES
- C10K: PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The method of cooling a hot synthesis gas as claimed in claim 1 wherein said hot synthesis gas is at temperature of 1800.degree. F.-3500.degree. F. and contains solids in amount of 1-10 pounds per thousand cubic feet (NTP) of dry gas.

### Claim 3 (depends on 1)

The method of cooling a hot synthesis gas as claimed in claim 1 wherein said cooling liquid is at inlet temperature of 100.degree. F.-500.degree. F.

### Claim 4 (depends on 1)

The method of cooling a hot synthesis gas as claimed in claim 1 wherein said gas is cooled by 200.degree. F.-500.degree. F. during passage through said first contacting zone.

### Claim 5 (depends on 1)

The method of cooling a hot synthesis gas as claimed in claim 1 wherein said gas is cooled by 600.degree.-1300.degree. F. during passage through said second contacting zone.

### Claim 6 (depends on 1)

The method of cooling a hot synthesis gas as claimed in claim 1 wherein said gas is cooled by 200.degree.-650.degree. F. during passage through said third contacting zone.

### Claim 7 (depends on 1)

The method of cooling a hot synthesis gas as claimed in claim 1 wherein said gas leaving said third contacting zone contains about 10-20 w % of the solids in the hot synthesis gas.

### Claim 8

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.