Method of operating a gas-turbine group combined with a waste-he

Details Method of operating a gas-turbine group combined with a waste-he Method of operating a gas-turbine group combined with a waste-he

1996-12-06

1998-09-01

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

60 3907, 60 39182, F02C 618

Patent

active

057994811

ABSTRACT:
A method of operating a gas-turbine group, combined with a downstream waste-heat steam generator and a steam consumer, in particular a steam turbine, for heat/power cogeneration. The object of the invention is to provide a method which utilizes the utilizable heat energy in the waste-heat steam generator of such a combined-cycle plant at a lower cost and reduces the output fluctuations when demand varies at the external heat consumer. According to the invention, this is achieved in that first of all a quantity of feedwater increased by the maximum heating-water quantity required is directed into the waste-heat steam generator (2). After the feedwater is heated, the additional quantity is diverted as heating water from the water/steam cycle. The diverted heating water is then supplied to the external consumer (30) and the residual heat is used to heat the feedwater tank (3). If there is low demand or no demand for heating water at the external consumer (30), the released quantity of additional feedwater is used to generate steam.

REFERENCES:
patent: 2717491 (1955-09-01), Barr
patent: 4827711 (1989-05-01), Isaksson
patent: 4920276 (1990-04-01), Tateishi et al.
"Das kombinierte Gas-/Dampfturbinen-Heizkraftwerk Utrecht", H.R. Gubser, Brown Boveri Mitt. Oct. 1978, pp. 687-690.

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