# US 8,769,953 B2 · Method for operating a power plant and power plant

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- Number: US 8,769,953 B2
- Document ID: US8769953B2
- Status: Granted
- Kind: B2
- Application number: 13/103,600
- Filed: 2011-05-09
- Published: 2011-08-25
- Granted: 2014-07-08
- Earliest claimed: 2004-06-11
- Assignees: ALSTOM Technology Ltd
- Applicants: Rolf Althaus
- Inventors: Rolf Althaus
- Web page: https://patentgrep.com/patent/US8769953B2

## CPC

- F01K 23/10: with exhaust fluid of one cycle heating the fluid in another cycle (F01K17/025 takes precedence)
- Y02E 20/16: Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- 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)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A power plant includes a power machine and a flue gas flow path following downstream of the power machine. A flue gas flow path is scavenged with fresh air before the flue gas flow path is acted upon with flue gas. To carry out the scavenging operation, air is extracted from a pressure accumulator and the air is introduced into the flue gas flow path downstream of the power machine. The power machine can be an exhaust gas heat exchanger.

## Claims

### Claim 1

A power plant, comprising:
a pressure accumulator;
at least one power machine;
an exhaust gas heat exchanger downstream of the power machine;
a flue gas flow path extend fluidly from the at least one power machine to the exhaust gas heat exchanger; and
a line leading from the pressure accumulator to the flue gas flow path having a shut-off member.

### Claim 2 (depends on 1)

The power plant as claimed in claim 1, wherein a heat-emitting primary-side flow path of the exhaust gas heat exchanger is arranged in the flue gas flow path, and the line issues in the flue gas flow path upstream of the exhaust gas heat exchanger.

### Claim 3 (depends on 2)

The power plant as claimed in claim 2, wherein the exhaust gas heat exchanger is a waste-heat recovery steam generator.

### Claim 4 (depends on 2)

The power plant as claimed in claim 2, comprising an accumulator fluid expansion machine and an accumulator fluid flow path leading from the pressure accumulator to the accumulator fluid expansion machine.

### Claim 5 (depends on 4)

The power plant as claimed in claim 4, wherein the accumulator fluid flow path leads through a heat-absorbing secondary-side flow path of the exhaust gas heat exchanger and then to the accumulator fluid expansion machine.

### Claim 6 (depends on 5)

The power plant as claimed in claim 5, wherein an outflow from the accumulator fluid expansion machine leads to the primary-side flow path of the exhaust gas heat exchanger.

### Claim 7 (depends on 2)

The power plant as claimed in claim 2, comprising a gas turbo group, a flue gas outflow of which issues in the primary-side flow path of the exhaust gas heat exchanger.

### Claim 8 (depends on 2)

The power plant as claimed in claim 2, comprising a firing device is arranged upstream of the primary-side flow path of the exhaust gas heat exchanger.