Power generation system, driving method for power generation system, and combustor

Patent metadata

Field	Value
Publication number	US-10107190-B2
Application number	US-201314437338-A
Country	US
Kind code	B2
Filing date	Nov 5, 2013
Priority date	Nov 21, 2012
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

In a power generation system, exhausted fuel gas exhausted from a solid oxide fuel cell (SOFC) is used as a fuel of a first combustor or a second combustor of a gas turbine, and at the same time, a part of compressed air compressed by a compressor of the gas turbine is used to drive the SOFC. The gas turbine includes the first combustor for burning fuel gas which is different from the exhausted fuel gas, a first turbine configured to be driven by combustion gas supplied from the first combustor, the second combustor for burning at least a part of the exhausted fuel gas, and a second turbine coupled with the first turbine and configured to be driven by combustion gas supplied from the second combustor.

First claim

The invention claimed is:

1. A power generation system comprising:
a fuel cell from which exhausted fuel gas is to be exhausted;
a gas turbine where the exhausted fuel gas is to be used as a fuel; and
an exhausted fuel gas exhaust line connecting the fuel cell and the gas turbine and being configured to supply the exhausted fuel gas to the gas turbine;
a first compressed air supply line; and
a second compressed air supply line;
wherein the gas turbine includes:
a first combustor for burning fuel gas which is different from the exhausted fuel gas,
a first turbine configured to be driven by combustion gas supplied from the first combustor,
a compressor which is integrally rotatable and connected to the first turbine via a first shaft and configured to compress air and discharge compressed air;
a second combustor for burning at least a part of the exhausted fuel gas, and
a second turbine coupled with the first turbine via a second shaft and configured to be driven by combustion gas supplied from the second combustor;
wherein the first compressed air supply line connects the compressor and the exhausted fuel gas exhaust line and is configured to supply at least a first part of the compressed air to the exhausted fuel gas exhaust line; and
wherein the second compressed air supply line connects the compressor and the fuel cell and is configured to supply at least a second part of the compressed air to the fuel cell.

2. The power generation system according to claim 1 , further comprising:
a clutch configured to connect or disconnect a shaft coupling between the first turbine and the second turbine.

3. The power generation system according to claim 1 , further comprising:
a first fuel gas supply line configured to supply the fuel gas to the first combustor;
an exhausted fuel gas supply line which is part of the exhausted fuel gas exhaust line and is configured to supply the at least the part of the exhausted fuel gas to the second combustor;
a fuel gas control valve configured to be in the first fuel gas supply line;
an exhausted fuel gas control valve configured to be in the exhausted fuel gas supply line; and
a control device configured to: (i) close the exhausted fuel gas control valve and open the fuel gas control valve before the fuel cell is driven, and (ii) open the exhausted fuel gas control valve after the fuel cell has been driven.

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• Manabe So
• Fujii Kentaro

Classifications

• F02C6/10 Primary

  supplying working fluid to a user, e.g. a chemical process, which returns working fluid to a turbine of the plant · CPC title

• F23R3/346

  for staged combustion · CPC title

• F02C9/40

  specially adapted to the use of a special fuel or a plurality of fuels · CPC title

• F02C6/18

  using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants (using waste heat as source of energy for refrigeration plants F25B27/02; using the waste heat of a gasturbine for steam generation or in a steam cycle see F01K23/10) · CPC title

• F02C6/00 Primary

  Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use · CPC title