# US 8,540,897 B1 · Water quench for gasifier

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,540,897 B1
- Document ID: US8540897B1
- Status: Granted
- Kind: B1
- Application number: 13/459,897
- Filed: 2012-04-30
- Granted: 2013-09-24
- Earliest claimed: 2012-04-30
- Assignees: Kellogg Brown & Root LLC
- Applicants: John Abughazaleh; Peter Van Smith; Richard B. Strait
- Inventors: John Abughazaleh; Peter Van Smith; Richard B. Strait
- Web page: https://patentgrep.com/patent/US8540897B1

## CPC

- C10J 3/466: {Entrained flow processes}
- C01B 3/52: by contacting with liquids; Regeneration of used liquids
- C10J 3/56: Apparatus; Plants
- C10J 3/721: {Multistage gasification, e.g. plural parallel or serial gasification stages}
- C01B 2203/0283: containing a CO-shift step, i.e. a water gas shift step
- C01B 2203/0288: containing two CO-shift steps
- C01B 2203/0405: Purification by membrane separation
- C01B 2203/0415: Purification by absorption in liquids
- C01B 2203/0425: In-situ adsorption process during hydrogen production
- C01B 2203/043: Regenerative adsorption process in two or more beds, one for adsorption, the other for regeneration
- C01B 2203/046: Purification by cryogenic separation
- C01B 2203/0475: the impurity being carbon dioxide
- C01B 2203/0485: the impurity being a sulfur compound
- C01B 2203/1076: Copper or zinc-based catalysts
- C10J 2300/0916: Biomass
- C10J 2300/093: Coal
- 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
- C10J 2300/1807: Recycle loops, e.g. gas, solids, heating medium, water
- 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
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}

## Abstract

Systems and methods for gasifying a feedstock are provided. A feedstock can be introduced to a riser. A first oxidant can be introduced to a first mixing zone within the riser, thereby generating a first high temperature zone within the first mixing zone proximate an entry point of the first oxidant. A first stream of water can be introduced to the first high temperature zone to reduce the temperature therein. A second oxidant can be introduced to a second mixing zone within the riser, thereby generating a second high temperature zone within the second mixing zone proximate an entry point of the second oxidant. A second stream of water can be introduced to the second high temperature zone to reduce the temperature therein. The feedstock and the first and second oxidants can be gasified in a gasification zone within the riser.

## Claims

### Claim 1

A method for gasifying a feedstock, comprising:
introducing a feedstock to a riser;
introducing a first oxidant to a first mixing zone within the riser, thereby generating a first high temperature zone within the first mixing zone proximate an entry point of the first oxidant, wherein the first high temperature zone is at a temperature of about 1,050° C. to about 1,250° C.;
introducing a first stream of water to the first high temperature zone to reduce the temperature therein;
introducing a second oxidant to a second mixing zone within the riser, thereby generating a second high temperature zone within the second mixing zone proximate an entry point of the second oxidant;
introducing a second stream of water to the second high temperature zone to reduce the temperature therein; and
gasifying the feedstock and the first and second oxidants in a gasification zone within the riser.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first stream of water is at a temperature of about 90° C. to about 120° C.

### Claim 3 (depends on 1)

The method of claim 1, wherein the first stream of water is at a pressure of 3,900 kPa to about 4,500 kPa.

### Claim 4 (depends on 1)

The method of claim 1, wherein a weight ratio of the feedstock to the first oxidant introduced to the riser is from about 0.6:1 to about 16.7:1.

### Claim 5 (depends on 1)

The method of claim 1, wherein the second high temperature zone is at a temperature of about 900° C. to about 1,200° C.

### Claim 6 (depends on 1)

The method of claim 1, wherein the first oxidant is introduced at a rate of about 12,000 kg/hr to about 50,000 kg/hr, and wherein the first stream of water is introduced at a rate of about 5,000 kg/hr to about 10,000 kg/hr.

### Claim 7 (depends on 6)

The method of claim 6, wherein the second oxidant is introduced at a rate of about 12,000 kg/hr to about 50,000 kg/hr, and wherein the second stream of water is introduced at a rate of about 2,000 kg/hr to about 5,000 kg/hr.

### Claim 8 (depends on 1)

The method of claim 1, wherein the first oxidant and the first stream of water are introduced separately into the first mixing zone, combined prior to being introduced into the first mixing zone, or a combination thereof.

### Claim 9 (depends on 1)

The method of claim 1, wherein generating the first high temperature zone comprises combusting carbon-containing particulates circulating therethrough.