Method for operating a combined gas and steam power plant with steam heated by an exothermic chemical reaction

Patent metadata

Field	Value
Publication number	US-11015490-B2
Application number	US-201615766130-A
Country	US
Kind code	B2
Filing date	Sep 26, 2016
Priority date	Oct 7, 2015
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

The present disclosure relates to combined gas and steam power plants. Various embodiments may include methods for operating such plants, such as: generating hot steam with an exhaust gas of a gas turbine; driving a generator with the steam; diverting at least a part of the generated steam and storing the diverted steam in a steam accumulator; then, discharging at least a part of the steam stored in the steam accumulator from the steam accumulator; heating the steam discharged from the steam accumulator with heat released during an exothermic chemical reaction; and feeding the heated steam to drive the turbine device.

First claim

What is claimed is:

1. A method for operating a combined gas and steam power plant, the method comprising:
generating steam with an exhaust gas of a first gas turbine;
using a first portion of the steam to drive a generator for providing electrical current with a second turbine;
diverting a second portion of the generated steam and storing the second portion of the steam in a steam accumulator;
discharging at least a portion of the second portion of the steam stored in the steam accumulator from the steam accumulator;
heating the at least a portion of the second portion of the steam with heat released during an exothermic chemical reaction; and
feeding the at least a portion of the second portion of steam after heating to drive the second turbine.

2. The method as claimed in claim 1 , further comprising using products of an endothermic chemical reaction as reactants of the exothermic chemical reaction.

3. The method as claimed in claim 2 , further comprising obtaining heat for the endothermic chemical reaction from at least a part of the steam generated by the exhaust gas.

4. The method as claimed in claim 3 , further comprising transferring heat from the part of the steam to reactants of the endothermic chemical reaction to carry out the endothermic reaction.

5. The method as claimed in claim 1 , further comprising supplying the second turbine with the at least a portion of the second portion of steam after heating for driving the turbine device to step up the combined gas and steam power plant from a first load range to a second load range with a higher load than the first load range.

6. The method as claimed in claim 5 , further comprising using products of an endothermic chemical reaction as reactants of the exothermic chemical reaction;
wherein the endothermic chemical reaction is carried out in the second load range.

7. A combined gas and steam power plant comprising:
a gas turbine generating an exhaust gas;
a steam generator using the exhaust gas to provide steam;
a generator for providing electrical current with a turbine device driven by a first portion of the steam; and
a steam accumulator diverting and storing at least a second portion of the steam from the steam generator;
wherein the steam accumulator discharges at least a part of the second portion of the steam stored therein; and
a reactor for an exothermic chemical reaction to heat the at least a part of the second portion of the steam;
wherein the at least a part of the second portion of steam after heating is used to drive the turbine device.

8. The plant as claimed in claim 7 , wherein products of an endothermic chemical reaction are used as reactants of the exothermic chemical reaction.

9. The plant as claimed in claim 8 , wherein heat from at least a part of the steam generated by means of the exhaust gas is used for the endothermic chemical reaction.

10. The plant as claimed in claim 9 , wherein heat from the part of the steam is transferred to reactants of the endothermic chemical reaction to carry out the endothermic reaction.

11. The plant as claimed in claim 8 , wherein the turbine device is supplied with the heated steam for driving the turbine device to step up the combined gas and steam power plant from a first load range to a second load range with a higher load than the first load range.

12. The plant as claimed in claim 11 , wherein the endothermic chemical reaction is carried out in the second load range.

Assignees

• Siemens Ag
• Siemens Energy Global Gmbh & Co Kg

Inventors

• Becker Stefan
• Danov Vladimir
• Lenk Uwe
• Reissner Florian
• Schmid Erich
• Schäfer Jochen

Classifications

• F01K13/02

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

• F01K1/04

  for storing steam in a liquid, e.g. Ruth's type (in alkali to increase steam pressure F22B1/20) · CPC title

• F01K3/008

  Use of steam accumulators of the Ruth type for storing steam in water; Regulating thereof (Ruth accumulators per se F01K1/04) · CPC title

• F01K3/188

  using heat from a specified chemical reaction · CPC title

• F01K23/10 Primary

  with exhaust fluid of one cycle heating the fluid in another cycle (F01K17/025 takes precedence) · CPC title