Abstract:
The present invention is concerned with the scheduling of maintenance actions such as washing events for a compressor of a gas turbine. An overall cost function including fuel/power price forecasts is evaluated/optimised in order to determine the advisability of a washing event. The cost function depends on a state vector comprising both Integer/Boolean and continuous state variables which are interconnected via a set of rules or constraints. Mixed Integer Programming (MIP) is a used for implementing the inventive procedure.
Abstract:
In a method and a computer program product for designing a component for an industrial plant, in particular a thick-walled component for a power plant, by means of an iteration, in which the steps of
computing a plurality of process variables by means of a process simulator; modelling growth of at least one hypothetical crack in the component, based on a structure of the component and the process variables; computing a life expectancy for the component by determining a time required for a dimension of the hypothetical crack to exceed a given critical limit; modifying the structure of the component; are repeated until the time required for the crack dimension to exceed the given critical limit fulfils a pre-determined requirement, a time dependent load-profile and a dynamic process simulator capable of modelling transient process behaviour is used to compute the process variables.
Abstract:
A control system, for use with a power plant having a mill for pulverising material for input into a combustion system of the power plant, the control system comprising: a first sensor (12), for recording a first parameter of a first output from the combustion system; a second sensor (14), for recording a second parameter of a second output from the combustion system; an adjuster system (16), for adjusting and recording at least one variable parameter of the combustion system; a state estimator (18) component operable to receives a first signal relating to such first parameter, a second signal relating to such a second parameter and a third signal relating to such at least one variable system parameter, the state estimator component being operable to use the first signal, second signal and third signal to produce a material parameter indicator signal (20) and a system state indicator signal (22); and an output component (24) operable to receive such a material parameter indicator signal and such a system state indicator signal and to combine said material parameter indicator signal and system state indicator signal to produce an output control signal.
Abstract:
In a method and computer program product for optimal operation of a power plant and a power plant optimising system an optimisation module (1) minimises a cost function ( J [ u ], J [ P ]) that comprises a deviation of lifetime of plant components ( LTp ( τ )) from a desired nominal lifetime trajectory ( LTn ( τ )). This is done by, at a given time, determining future values of input values ( u (τ), P (τ)) such as control values ( P (τ)) or process values ( u (τ)) to the plant and simulating, in a simulation module (2), the behaviour of the plant up to a given future time. Corresponding lifetime values are determined in the simulation, and incorporated in an objective function. The optimisation module (1) minimises the cost function ( J [ u ], J [ P ]) by varying the input values ( u ( τ ), P ( τ )). As a result, it is possible to operate the plant such that component lifetime ( LTp ( τ )) follows the desired trajectory ( LTn ( τ )).