# US 11,994,063 B2 · Turbine powered electricity generation

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- Number: US 11,994,063 B2
- Document ID: US11994063B2
- Status: Granted
- Kind: B2
- Application number: 16/654,436
- Filed: 2019-10-16
- Published: 2021-04-22
- Granted: 2024-05-28
- Earliest claimed: 2019-10-16
- Applicants: Richard Alan Callahan
- Inventors: Richard Alan Callahan
- Web page: https://patentgrep.com/patent/US11994063B2

## CPC

- F02C 3/34: with recycling of part of the working fluid, i.e. semi-closed cycles with combustion products in the closed part of the cycle
- B01D 53/047: Pressure swing adsorption
- B01D 53/22: by diffusion (manufacturing semi-permeable membranes B01D67/00; form, structure or properties of semi-permeable membranes B01D69/00; material for semi-permeable membranes B01D71/00)
- F02C 3/22: the fuel or oxidant being gaseous at standard temperature and pressure (F02C3/28 takes precedence)
- F02C 3/24: the fuel or oxidant being liquid at standard temperature and pressure
- F02C 3/30: Adding water, steam or other fluids {for influencing combustion, e.g. to obtain cleaner exhaust gases (F02C7/141, F02C7/30, F01D21/00, F01K21/04, F23D11/10 take precedence)}
- C01B 2203/0405: Purification by membrane separation
- F01K 23/10: with exhaust fluid of one cycle heating the fluid in another cycle (F01K17/025 takes precedence)
- F02C 3/305: {Increasing the power, speed, torque or efficiency of a gas turbine or the thrust of a turbojet engine by injecting or adding water, steam or other fluids (F01K21/04 takes precedence)}
- F05D 2260/61: Removal of CO2
- Y02E 20/16: Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- F01K: STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES (gas-turbine or jet-propulsion plants F02; nuclear power plants, engine arrangements therein G21D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A process is provided for separating syngas fuel into a CO-rich stream for feeding to an oxyfuel combustor of a CO2 turbine and a H2-rich stream for feeding to an air-fuel gas turbine for generating power, which provides an opportunity to realize operating and equipment advantages.

## Claims

### Claim 1

A process comprising:
a. feeding a separator feedstream comprising syngas from natural gas to membrane separator means,
b. separating the separator feedstream in the membrane separator means to form a first, CO-rich stream and a second, H2-rich stream,
c. feeding the first, CO-rich stream as an oxyfuel combustor feedstream to oxyfuel combustor means for forming sub-critical CO2 gas turbine working fluid, and
d. feeding the sub-critical CO2 gas turbine working fluid to gas turbine means for producing power,
e. wherein the sub-critical CO2 gas turbine working fluid exits the gas turbine means as gas turbine exhaust which is fed to first heat recovery steam generator means for generating steam, and wherein steam from the heat recovery steam generator means is fed as first steam working fluid to first steam turbine means for generating power,
f. wherein at least a first portion of exhaust from the gas turbine means is recycled as feed to the oxyfuel combustor means together with high purity oxygen and the CO-rich stream,
g. wherein the second, H2-rich stream is fed as an air-fuel combustor feedstream to air-fuel combustor means for forming air-fuel gas turbine working fluid, and wherein the air-fuel gas turbine working fluid is fed to air-fuel gas turbine means for producing power, and
h. wherein the first, CO-rich stream is fed directly from the membrane separator means to the oxyfuel combustor means.

### Claim 2 (depends on 1)

The process of claim 1, wherein the air-fuel gas turbine working fluid exits the air-fuel gas turbine means as air-fuel gas turbine exhaust which is fed to second heat recovery steam generator means for generating steam, and wherein steam from the second heat recovery steam generator means is fed as second steam working fluid to second steam turbine means for generating power.

### Claim 3 (depends on 1)

The process of claim 1, wherein the CO-rich stream comprises at least 35% CO and the H2-rich stream comprises at least 10% H2.

### Claim 4 (depends on 3)

The process of claim 3, wherein the CO-rich stream comprises at least 50% CO and the H2-rich stream comprises at least 20% H2.

### Claim 5 (depends on 4)

The process of claim 4, wherein the CO-rich stream comprises at least 60% CO.

### Claim 6 (depends on 1)

The process of claim 1, wherein the high purity oxygen is premixed with the recycled at least first portion of exhaust from the gas turbine means.

### Claim 7 (depends on 1)

The process of claim 1, wherein high purity oxygen is mixed with the recycled at least first portion of exhaust from the gas turbine means in situ within the oxyfuel combustor means.

### Claim 8 (depends on 6)

The process of claim 6, wherein the high purity oxygen is least 97% pure.

### Claim 9 (depends on 6)

The process of claim 6, wherein the high purity oxygen is least 99% pure.

### Claim 10 (depends on 1)

The process of claim 1, comprising air separator means for separating oxygen from air to produce the high purity oxygen.

### Claim 11

A process comprising:
a. feeding a separator feedstream comprising syngas from natural gas to separator means,
b. separating the separator feedstream in the separator means to form a first, CO-rich stream and a second, H2-rich stream,
c. feeding the first, CO-rich stream as an oxyfuel combustor feedstream to oxyfuel combustor means for forming sub-critical CO2 gas turbine working fluid,
d. feeding the sub-critical CO2 gas turbine working fluid to sub-critical CO2 gas turbine means, the sub-critical CO2 gas turbine means having a sub-critical CO2 gas turbine expansion section and a sub-critical CO2 gas turbine compression section, the sub-critical CO2 gas turbine working fluid being fed to the sub-critical CO2 gas turbine expansion section for producing power,
e. recycling at least a first portion of exhaust from the sub-critical CO2 gas turbine expansion section to the sub-critical CO2 gas turbine compression section of the sub-critical CO2 gas turbine means, wherein the power produced in step (d) is used to power the sub-critical CO2 gas turbine compression section to compress the recycled at least first portion of exhaust from the sub-critical CO2 gas turbine expansion section,
f. capturing the remaining portion of the exhaust from the sub-critical CO2 gas turbine expansion section,
g. feeding the compressed recycled at least first portion of exhaust from sub-critical CO2 gas turbine expansion section to the oxyfuel combustor means,
h. reacting the first, CO-rich stream with high purity oxygen in the oxyfuel combustor means under sub-critical CO2 conditions,
i. feeding the second, H2-rich stream as an air-fuel combustor feedstream to air-fuel combustor means wherein the air-fuel combustor feedstream is reacted with air to form an air-fuel gas turbine working fluid,
j. feeding the air-fuel gas turbine working fluid to air-fuel gas turbine means, the air-fuel gas turbine means having an air-fuel gas turbine expansion section and an air-fuel gas turbine compression section, the air-fuel gas turbine working fluid being fed to the air-fuel gas turbine expansion section for producing power,
k. feeding air to the air-fuel gas turbine compression section of the air-fuel gas turbine means, wherein the air is compressed using the power produced in step (j),
l. feeding the compressed air to the air-fuel combustor means for reaction with the second, H2-rich stream to form the air-fuel gas turbine working fluid,
m. wherein before recycling the at least first portion of exhaust from the sub-critical CO2 gas turbine expansion section to the sub-critical CO2 gas turbine compression section of the sub-critical CO2 gas turbine means, the exhaust from the sub-critical CO2 gas turbine expansion section is fed to first heat recovery steam generator means for generating steam,
n. wherein steam from the first heat recovery steam generator means is fed to first steam turbine means for generating power,
o. wherein exhaust from the air-fuel gas turbine means is fed to second heat recovery steam generator means for generating steam,
p. wherein steam from the second heat recovery steam generator means is fed to second steam turbine means for generating power, and
q. wherein the first, CO-rich stream is fed directly from the separator means to the oxyfuel combustor means.