# US 10,570,348 B2 · All-steam gasification for supercritical CO2 power cycle system

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- Number: US 10,570,348 B2
- Document ID: US10570348B2
- Status: Granted
- Kind: B2
- Application number: 15/868,334
- Filed: 2018-01-11
- Published: 2018-07-19
- Granted: 2020-02-25
- Earliest claimed: 2017-01-15
- Assignees: Wormser Energy Solutions, Inc.
- Applicants: Wormser Energy Solutions, Inc.
- Inventors: Alex Wormser; John Parkes; Douglas M. Todd
- Web page: https://patentgrep.com/patent/US10570348B2

## CPC

- C10J 3/466: {Entrained flow processes}
- C10J 3/12: using solid heat-carriers
- C10J 3/485: {Entrained flow gasifiers}
- C10J 3/506: {for entrained flow gasifiers}
- C10J 3/56: Apparatus; Plants
- C10J 3/60: Processes
- C10J 3/66: by introducing them into the gasification zone
- C10J 3/82: Gas withdrawal means
- C10J 2300/0903: Feed preparation
- C10J 2300/0906: Physical processes, e.g. shredding, comminuting, chopping, sorting
- C10J 2300/093: Coal
- C10J 2300/0933: Coal fines for producing water gas
- C10J 2300/0936: Coal fines for producing producer gas
- C10J 2300/094: Char
- C10J 2300/0956: Air or oxygen enriched air
- C10J 2300/0959: Oxygen
- C10J 2300/0976: as steam
- C10J 2300/0993: Inert particles, e.g. as heat exchange medium in a fluidized or moving bed, heat carriers, sand
- C10J 2300/1215: using synthesis gas as fuel
- C10J 2300/1246: by external or indirect heating
- C10J 2300/1606: Combustion processes
- C10J 2300/165: integrated with a gas turbine or gas motor
- C10J 2300/1653: integrated in a gasification combined cycle [IGCC]
- C10J 2300/1671: with the production of electricity
- C10J 2300/1687: with steam generation
- C10J 2300/1807: Recycle loops, e.g. gas, solids, heating medium, water
- C10J 2300/1853: Steam reforming, i.e. injection of steam only
- C10J 2300/1884: with one stream being synthesis gas
- C10J 2300/1892: with one stream being water/steam
- Y02E 20/16: Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- Y02E 20/18: Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
- Y02P 20/54: using solvents, e.g. supercritical solvents or ionic liquids
- 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
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A carbonaceous fuel gasification system for a supercritical CO2 power cycle system includes a micronized char preparation system comprising a devolatilizer that receives solid carbonaceous fuel, hydrogen, oxygen, and fluidizing steam and produces micronized char, steam, hydrogen, and volatiles. An indirect gasifier includes a vessel comprising a gasification chamber that receives the micronized char, a conveying gas, and steam where the gasification chamber provides syngas, ash, and steam. A combustion chamber receives syngas and an oxidant and burns the mixture of syngas with the oxidant to provide heat for gasification and for heating incoming flows, thereby generating steam and CO2. The heat for gasification is transferred from the combustion chamber to the gasification chamber by circulating refractory sand. A syngas cooler cools the syngas and generates steam and provides to a supercritical CO2 power cycle system that performs a supercritical CO2 power cycle for generating power.

## Claims

### Claim 1

A method of carbonaceous fuel gasification, the method comprising:
a) producing micronized char, steam, volatiles, and hydrogen from solid carbonaceous fuel, hydrogen, and oxygen;
b) providing fluidizing steam to a micronized char preparation system, the micronized char preparation system comprising a devolatilizer;
c) producing syngas and steam by gasifying the micronized char in an indirect gasifier, the indirect gasifier comprising a vessel having a gasification chamber;
d) burning a mixture of hydrogen and carbon monoxide with an oxidant in a combustion chamber in the indirect gasifier to provide heat for gasification using circulating refractory sand, thereby generating CO2;
e) generating steam in a syngas cooler coupled to an outlet of the indirect gasifier; and
f) directing the generated CO2 to a supercritical CO2 power cycle system.

### Claim 2 (depends on 1)

The method of claim 1 wherein the burning of the mixture of hydrogen and carbon monoxide with the oxidant in the combustion chamber generates steam and nitrogen that are directed to a products of combustion system, the products of combustion system comprising adiabatic calcium looping.

### Claim 3 (depends on 1)

The method of claim 1 wherein the burning of the mixture of hydrogen and carbon monoxide with the oxidant in the combustion chamber generates steam and nitrogen that are directed to a products of combustion system, the products of combustion system comprising carbon capture system.

### Claim 4 (depends on 3)

The method of claim 3 further comprising directing the steam and nitrogen generated by the combustor to an expander and then to stack condensers.

### Claim 5 (depends on 1)

The method of claim 1 wherein the burning of the mixture of hydrogen and carbon monoxide with the oxidant in the combustion chamber generates steam that is directed to the supercritical CO2 power cycle system.

### Claim 6 (depends on 1)

The method of claim 1 wherein the method further comprises performing all-steam gasification.

### Claim 7 (depends on 1)

The method of claim 1 wherein the oxidant comprises oxygen.

### Claim 8 (depends on 1)

The method of claim 1 wherein the oxidant comprises air.

### Claim 9 (depends on 1)

The method of claim 1 wherein the burning of the mixture of hydrogen and carbon monoxide with the oxidant in a combustion chamber further comprises adding CO2 to the oxidant.

### Claim 10 (depends on 1)

The method of claim 1 wherein the carbonaceous fuel comprises coal.

### Claim 11 (depends on 1)

The method of claim 1 wherein the gasifying of the micronized char comprises providing the indirect gasifier with volatiles from the micronized char preparation system.

### Claim 12 (depends on 1)

The method of claim 1 further comprising injecting fluidizing steam into a heated pressure vessel of the devolatilizer and removing volatiles and coarse char from the heated pressure vessel.

### Claim 13 (depends on 1)

The method of claim 1 further comprising separating course char from volatiles using a cyclone and injecting the separated coarse char into the micronized char preparation system and injecting the volatiles into the indirect gasifier.

### Claim 14 (depends on 1)

The method of claim 1 further comprising directing the steam and CO2 generated by the indirect gasifier combustor to a product of combustion conditioning system before directing to the input of the supercritical CO2 power cycle system.

### Claim 15 (depends on 1)

The method of claim 1 further comprising processing the syngas to reduce impurities using a syngas clean-up system.

### Claim 16 (depends on 1)

The method of claim 1 further comprising receiving steam in the gasification chamber from a steam heater.

### Claim 17 (depends on 1)

The method of claim 1 further comprising receiving steam in the gasification chamber from a heat recovery system.

### Claim 18 (depends on 1)

The method of claim 1 further comprising directing the steam generated by the syngas cooler to a small steam cycle.

### Claim 19 (depends on 18)

The method of claim 18 wherein the supercritical CO2 power cycle system comprises the small steam cycle.