The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2001
Filed:
Feb. 25, 2000
Erich Schmid, Marloffstein, DE;
Helmut Stierstorfer, Erlangen, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A method for operating a combined-cycle power plant includes utilizing heat contained in an expanded working medium of an associated gas turbine operable with both gas and oil as fuel, to generate steam for an associated steam turbine having at least one high-pressure stage. After a change of the operation of the gas turbine from gas to oil, feed water to be supplied to the high-pressure stage is divided into a first and a second partial stream, and only one of the partial streams is preheated. Particularly high plant efficiency may be achieved with the method, irrespective of the fuel being used for the gas turbine, at a low outlay in terms of apparatus and operational requirements. A combined-cycle power plant that is particularly suitable for carrying out the method includes a bypass line connected in parallel with a feed-water preheater associated with the high-pressure stage.