# US 9,752,461 B2 · Steam power plant with a second low-pressure turbine and an additional condensing system

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- Number: US 9,752,461 B2
- Document ID: US9752461B2
- Status: Granted
- Kind: B2
- Application number: 14/158,989
- Filed: 2014-01-20
- Published: 2014-08-07
- Granted: 2017-09-05
- Earliest claimed: 2013-02-05
- Assignees: General Electric Technology GmbH
- Applicants: ALSTOM Technology Ltd
- Inventors: Fabian Bierewirtz; Volker Schüle; Hermann Seelinger
- Web page: https://patentgrep.com/patent/US9752461B2

## CPC

- F01K 11/02: the engines being turbines
- F01K 7/22: the turbines having inter-stage steam heating
- F01K 7/40: Use of two or more feed-water heaters in series
- F01K 9/00: Plants characterised by condensers arranged or modified to co-operate with the engines (by condensers structurally combined with engines F01K11/00; steam condensers per se F28B)(F01K23/04 takes precedence)
- F01K 9/003: {condenser cooling circuits}
- F01K 13/02: Controlling, e.g. stopping or starting
- F01K 23/10: with exhaust fluid of one cycle heating the fluid in another cycle (F01K17/025 takes precedence)
- F01K 25/08: using special vapours
- F28B 3/00: Condensers in which the steam or vapour comes into direct contact with the cooling medium
- F28B 7/00: Combinations of two or more condensers, e.g. provision of reserve condenser
- Y02E 20/14: Combined heat and power generation [CHP]
- 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)
- F28B: STEAM OR VAPOUR CONDENSERS (condensation of vapours B01D5/00; steam engine plants having condensers F01K; liquefaction of gases F25J; details of heat-exchange and heat-transfer arrangements of general application F28F)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A steam power plant with a low-pressure turbine is suggested with a second low-pressure turbine on a separated shaft line including a separate generator. The second low-pressure turbine is connected to an additional condensing system without cooling water consumption, thus allowing to maintain the power output at a high level, even if the main condensing system has a reduced capacity due to cooling water restrictions.

## Claims

### Claim 1

A steam power plant, comprising:
a first low-pressure turbine;
a wet condensing system fluidly connected to the low-pressure turbine configured to directly receive and cool an entire exhaust gas from the first low-pressure turbine;
a second low-pressure turbine; and
a dry condensing system fluidly connected downstream of the second low-pressure turbine configured to directly receive and cool an entire exhaust gas from the second low-pressure turbine;
a first steam valve fluidly connected upstream of the first low-pressure turbine; and
a second steam valve fluidly connected upstream of the second low-pressure turbine.

### Claim 2 (depends on 1)

The steam power plant according to claim 1, wherein the dry condensing system is of non-evaporative cooling and/or once through cooling type.

### Claim 3 (depends on 1)

The steam power plant according to claim 1, comprising: a high-pressure turbine and an intermediate-pressure turbine wherein the intermediate-pressure turbine and the first low-pressure turbine are connected by an overflow pipe.

### Claim 4 (depends on 3)

The steam power plant according to claim 3, wherein the second low-pressure turbine is connected to the overflow pipe.

### Claim 5 (depends on 4)

The steam power plant according to claim 4, wherein the overflow pipe comprises a branch piece which connects the overflow pipe to the second low-pressure turbine.

### Claim 6 (depends on 5)

The steam power plant according to claim 5, wherein the first steam valve is installed between the branch piece and the first low-pressure turbine.

### Claim 7 (depends on 5)

The steam power plant according to claim 5, wherein the second steam valve is installed between the branch piece and the second low-pressure turbine.

### Claim 8 (depends on 1)

The steam power plant according to claim 1, wherein the dry condensing system comprises a fan.

### Claim 9

A method for operating a steam power plant, the method comprising
providing a first portion of an exhaust gas to a first low-pressure turbine;
providing a second portion of the exhaust gas to a second low-pressure turbine;
directly cooling an entire exhaust gas from the first low-pressure turbine by a wet condensing system; and
directly cooling an entire exhaust gas from the second low-pressure turbine by a dry condensing system.

### Claim 10 (depends on 9)

The method of claim 9, wherein the dry condensing system is of non-evaporative cooling and/or once through cooling type.