Steam power plant with a second low-pressure turbine and an additional condensing system

Patent metadata

Field	Value
Publication number	US-9752461-B2
Application number	US-201414158989-A
Country	US
Kind code	B2
Filing date	Jan 20, 2014
Priority date	Feb 5, 2013
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

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.

First claim

The invention claimed is:

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.

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

3. 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.

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

5. 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.

6. 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.

7. 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.

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

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.

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

Assignees

• Alstom Technology Ltd
• General Electric Technology Gmbh

Inventors

• Bierewirtz Fabian
• SCHüLE VOLKER
• Seelinger Hermann

Classifications

• F01K7/22 Primary

  the turbines having inter-stage steam heating · CPC title

• F01K11/02 Primary

  the engines being turbines · CPC title

• Y02E20/14

  Combined heat and power generation [CHP] · CPC title

• F01K13/02

  Controlling, e.g. stopping or starting · CPC title

• F01K25/08

  using special vapours · CPC title