Power plants – Combustion products used as motive fluid
Reexamination Certificate
1998-12-01
2001-03-20
Freay, Charles G. (Department: 3746)
Power plants
Combustion products used as motive fluid
C060S039010, C060S039170
Reexamination Certificate
active
06202399
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
EP-0 646 704 A1 disclosed a method for regulating a gas turbo-generator set. This gas turbo-generator set consists essentially of a compressor unit, an HP combustion chamber, an HP turbine, an LP combustion chamber, an LP turbine and a generator. The fuel quantity for the HP combustion chamber is dimensioned by means of a corrected temperature signal which is formed by the value of the temperature at the outlet of the LP turbine, minus the respective temperature rise detectable there. This temperature signal is recorded by subtracting the generated temperature rise caused by the fuel quantity introduced into the LP combustion chamber from the measured temperature at the outlet of the LP turbine. The uncorrected temperature signal at the outlet of the LP turbine is used for dimensioning the fuel quantity for the LP combustion chamber.
In this method, the temperatures which are indispensable for regulation are recorded at locations where there is reliable technical implementation and repeatability. In this case, this regulating concept assumes that a temperature increase at the outlet of the LP turbine caused by the firing of the LP combustion chamber, can be recorded repeatably. A regulating concept for the metering of fuel into the two combustion chambers can be drawn up accordingly by means of this procedure.
Although this regulating concept makes it possible to control fuel metering effectively, it is repeatedly evident that sudden unforeseen disturbances, which have an indirect or direct effect on the process temperatures, cannot be mastered by regulation, as the situation arises, due to the inherent inertias of such a system.
SUMMARY OF THE INVENTION
The invention is intended to remedy this. The object on which the invention, as defined in the claims, is based is, in a method of the initially mentioned type, to eliminate the inertias in the recording of temperatures which are indispensable for regulation.
According to the invention, the system inertias to be expected from the outset are eliminated by controlling the fuel quantities, together with the pressures prevailing there by regulation which is aimed at pressure backup.
In this case, the fuel quantity for the high pressure combustion chamber is first controlled as a function of the pressure prevailing at the compressor outlet, the ratio between this fuel quantity and the compressor outlet pressure being continuously updated by means of a factor which reproduces the deviation of the inlet temperature into the high pressure turbine from the desired value of this temperature. The fuel quantity for the low pressure combustion chamber is controlled as a function of the pressure prevailing at the inlet into the low pressure turbine, the ratio between this fuel quantity and the pressure at the inlet into the low pressure turbine being likewise continuously updated by means of a factor reproducing the deviation of the inlet temperature into the low pressure turbine from the desired value of this temperature.
The essential advantage of the invention is to be seen in that the measured or calculated temperature is no longer used directly as the sole criterion for regulating the fuel quantity, but, instead, regulation which functions by pressure backup and which reacts, as the situation arises, to the ratio of the pressure to the fuel quantity is introduced. This directness is achieved because the pressure reacts immediately to a variation in the flow mass.
Advantageous and expedient developments of the solution according to the invention for achieving the object are defined in the further dependent claims.
An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. All the elements unnecessary for an immediate understanding of the invention are omitted. The directions of flow of the media and regulating pulses within the example shown are indicated by arrows.
REFERENCES:
patent: 4045955 (1977-09-01), Brannstrom et al.
patent: 5481865 (1996-01-01), Frutschi
patent: 6038848 (2000-03-01), Frutschi
patent: 0646704A1 (1995-04-01), None
patent: 0646705A1 (1995-04-01), None
patent: 0718470A2 (1996-06-01), None
Asea Brown Boveri AG
Burns Doane Swecker & Mathis L.L.P.
Freay Charles G.
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