Steam turbine plant

Patent metadata

Field	Value
Publication number	US-9664071-B2
Application number	US-201113081296-A
Country	US
Kind code	B2
Filing date	Apr 6, 2011
Priority date	Apr 7, 2010
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

A steam turbine plant of one embodiment includes at least one heater configured to change water into steam to produce high pressure steam and low pressure steam having a lower pressure than the high pressure steam, a high pressure turbine including a turbine or turbines connected to each other in series, and having a first inlet to supply the high pressure steam, a second inlet to supply the low pressure steam and located at a downstream of the first inlet, and an exhaust port located at a downstream of the second inlet, the high pressure turbine being configured to be driven by the steam supplied from the first and second inlets, a reheater configured to heat the steam exhausted from the exhaust port, and a reheat turbine configured to be driven by the steam from the reheater.

First claim

The invention claimed is:

1. A steam turbine plant comprising:
a heater configured to change water into steam, the heater producing high pressure steam and low pressure steam having a lower pressure than the high pressure steam by using heat from a single heat source;
a high pressure turbine having a first inlet to supply the high pressure steam, a second inlet to supply the low pressure steam and located downstream of the first inlet, and an exhaust port located downstream of the second inlet, the high pressure turbine being configured such that the high pressure steam supplied from the first inlet drives the high pressure turbine, expands in the high pressure turbine, decreases in pressure, and is then merged with the low pressure steam supplied from the second inlet in the high pressure turbine, and the merged high pressure steam and low pressure steam further drive the high pressure turbine, expand in the high pressure turbine, decrease in pressure, and are then exhausted from the exhaust port;
a reheater located downstream of the high pressure turbine and configured to heat the steam exhausted from the exhaust port; and
a reheat turbine located downstream of the reheater and configured to be driven by the steam from the reheater.

2. The plant of claim 1 , further comprising a solar energy collector configured to collect solar heat,
wherein the heater and the reheater are configured to heat the water or the steam to be heated by the solar heat.

3. The plant of claim 2 , wherein
the solar energy collector is a trough condensing type solar energy collector.

4. The plant of claim 1 , wherein
the high pressure turbine is driven such that a difference between the temperature of the steam at the first inlet and the saturation temperature under the pressure of the steam at the first inlet is 100° C. or less.

5. The plant of claim 1 , wherein
the high pressure turbine is driven such that inlet steam at the first inlet has a pressure of 20 ata or more and a temperature of 420° C. or less.

6. The plant of claim 1 , further comprising:
a steam valve configured to adjust a flow rate of the low pressure steam or to stop a circulation of the low pressure steam.

7. The plant of claim 1 , wherein
a turbine, other than the most downstream turbine among all turbines of the steam turbine plant, is configured to operate such that the steam circulating inside the turbine is maintained as dry steam.

Assignees

• Goto Koichi
• Okita Nobuo
• Toshiba Kk

Inventors

• Goto Koichi
• Okita Nobuo

Classifications

• Y02E10/46

  Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines · CPC title

• F01K7/22

  the turbines having inter-stage steam heating · CPC title

• F22B1/006

  using solar heat · CPC title

• F01K7/18 Primary

  the turbine being of multiple-inlet-pressure type · CPC title

• F01K7/226

  Inter-stage steam injection · CPC title