摘要:
A method of controlling the operation of a thermoelectric power generating plant, in which the operation of the steam generating equipment and the turbine is controlled in accordance with the plant operation parameters obtained from given patterns of start up and operation of the plant. The method comprises: temporarily setting, in accordance with the above-mentioned patterns, the plant operation parameters concerning the rates of change of state of the plant such as the rates of turbine acceleration and turbine load and rates of increase of the main steam temperature and pressure; estimating the change of the quantity of state of main steam at a designated future moment; estimating the thermal stresses in respective stress-evaluation portions of the boiler and turbine; comparing the estimated thermal stresses with respective allowable thermal stresses determined so as to correspond to the consumption of the life allowed for each start up and operation cycle of the plant; selecting one of the estimated thermal stresses which has smaller margin to the allowable thermal stress and obtaining the operation parameter which provided the maximum rate of change of the state of the plant; repeating these steps until the command state is attained; and controlling the boiler and the turbine in accordance with the thus obtained plant operation parameter.
摘要:
A process control system controls a large scale plant such as thermal power plant. This process control system includes a target setting unit for setting an operation target, a control unit for receiving a signal indicating the operation target and for outputting a controlled variable to operate the process, an evaluation unit for quantitatively evaluating operation characteristics corresponding to the operation target of the process operated on the basis of a signal indicating the controlled variable supplied from the control unit, a modification unit for extracting an optimum operation process qualitatively squaring or conforming with the evaluated value derived by the evaluation unit out of a modification rule predetermining operation unit in qualitative relation between the operation characteristics and the operation target of the process and for determining the modification rate of the control unit, a storage unit having a model of a neural network for storing a relation between the operation target and the modification rate derived by the modification unit as a connection state within a circuit, and a learning unit for making the model of the neural network learn the relation between the operation target and the modification rate.
摘要:
A safeguard arrangement for a plant, which comprises a plant auxiliary provided with a lid and so designed that the lid is opened for maintenance of the inside thereof, switching means installed on a piping connected to said plant auxiliary, and driving means to give a driving output to the switching means in response to an opening or closing instruction signal for said switching means, and which is employed when operations for maintenance of the aforesaid plant auxiliary are executed, is provided additionally with lid opening detecting means to detect the opening of the lid of the aforesaid plant auxiliary or the release of locking means thereof, in gearing with either of them, and checking means to check the opening of the aforesaid switching means on the basis of the opening instruction signal for the switching means when it is detected by said lid opening detecting means that the lid is opened or to be opened.
摘要:
In a plant for which process control is made, a margin of an operation allowable limit for a process variable is variably established according to situations for each apparatus constituting the plant. In addition, allowable upper limits of operation considering a life consumption state and an operation schedule of each apparatus are established for respective apparatus on the basis of a life of the whole plant. The life of each apparatus and the life of the whole plant are controlled with a goal to expire all equipment substantially at the same time by reflecting the allowable operating conditions of the apparatus constituting the plant on the plant control. Therefore, it is possible to realize rational and useful plant operation.
摘要:
A system for announcing operating conditions of a plant includes an identifying unit identifying plant site operating conditions on the basis of information signals indicative of the operating conditions at plate sites at the plant site, a voice message signal generating unit determining plant site operating instruction signals on the basis of the identified plant operating conditions and converting the determined instruction signals into corresponding voice message signals, a voice message signal output unit, and a voice message announcing order selection unit including a memory for temporarily storing the voice message signals, an announcing order determining unit for determining the order of announcement of the stored voice message signals, and an output selecting unit for sequentially applying the stored voice message signals to the message signal output unit in the determined order.
摘要:
A safeguard arrangement for a plant, which comprises a plant auxiliary provided with a lid and so designed that the lid is opened for maintenance of the inside thereof, switching means installed on a piping connected to said plant auxiliary, and driving means to give a driving output to the switching means in response to an opening or closing instruction signal for said switching means, and which is employed when operations for maintenance of the aforesaid plant auxiliary are executed, is provided additionally with lid opening detecting means to detect the opening of the lid of the afore-said plant auxiliary or the release of locking means thereof, in gearing with either of them, and checking means to check the opening of the aforesaid switching means on the basis of the opening instruction signal for the switching means when it is detected by said lid opening detecting means that the lid is opened or to be opened.
摘要:
A display device or method for an operating procedure which enables an accurate transmission of an operating procedure of a target element to an operator, which enables the operator to understand the operating procedure promptly and rationally and which enables the operator to look at functional elements on the screen from a desired direction by the operation of the operator. Three-dimensional dynamic scene information is exploded based on three-dimensional scene information of mono-elements and three-dimensional procedure information which shows the handling procedure of functional elements. The three-dimensional scene information is structured by coordinates information of a desired reciprocal viewpoint and is displayed as exploded three-dimensional graphics in the display device. The coordinates information of a desired reciprocal viewpoint signifies a locus of time or a sequence of a variable which shows a reciprocal position and direction between an object and a viewpoint, and signifies time-series data of coordinates information which is suitable for showing the operating procedure.
摘要:
Described is a processing system for knowledge data base in which indices representing the degrees of certainty of causal relations between an event and plural events relevant to the first-mentioned event are stored. The system has an input unit for inputting information on those actually experienced among events inferred based on the knowledge data base, an updating unit for updating the indices so that, among the plural causal relations, the certainty of the causal relation corresponding to the actually experienced event inputted by the input means is made higher relative to the certainties of the other causal relations, and a storing unit for storing back the thus-updated indices again in the knowledge data base. This allows an expert system with the processing system to perform inference with higher certainty.
摘要:
A knowledge information generating system including: a fundamental rule storage for making and storing, for each process data to be controlled, another process data relating to the former and the relations between these process data in advance as fundamental rules; a process data input processor for inputting and storing the process data to be controlled; a knowledge information collection necessity decider for detecting that the process data obtained from the process data input processor have changed or deviated from a predetermined relation; a knowledge information editor for fetching the fundamental rules relating to the process data, which are decided to be collected by the knowledge information collection necessity decider, from the fundamental rule storage, to edit the process data on the basis of the relations between the data group stored in the process data input processor and the process data stored in the fundamental rules; and a knowledge data base for storing the knowledge information obtained from the knowledge information editor.
摘要:
A control system for an industrial plant receives plant data and combines that plant data with a plurality of graphical patterns representing the plant. In this way a series of prepared displays are created to be displayed fox a user of the control system. If the user wants to simplify one or more of the displays, in order to make it more clear, the control system has means for modifying the displays, and displaying that modified display. The modification may be one of a number of possibilities such as deletion (masking) part or all of the display. In this way, the full plant information may be presented, or more limited information may be presented, e.g. to a more experienced user.