Plant performance evaluation apparatus, plant performance evaluation system, and plant performance evaluation method

Patent metadata

Field	Value
Publication number	US-10520934-B2
Application number	US-201715417365-A
Country	US
Kind code	B2
Filing date	Jan 27, 2017
Priority date	Feb 5, 2016
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

A plant performance evaluation apparatus includes a first storage storing a first static model indicating a model of a first steady state in a plant, a second storage storing a first dynamic model indicating a model of a dynamic state of the plant, a model converter configured to convert the first dynamic model to a second static model indicating a model of a second steady state of the plant, and to store the second static model into the first storage, the first steady state indicating a steady state of the plant temporally before the second steady state, a comparator configured to compare parameters included in the first static model with parameters included in the second static model and to output a comparison result, and a display configured to display the comparison result output from the comparator.

First claim

What is claimed is:

1. A plant performance evaluation apparatus comprising:
a first storage storing a first static model indicating a model of a first steady state, the first steady state indicating a state in which input and output of process units included in a plant are fixed with time;
a second storage storing a first dynamic model indicating a model of a dynamic state, the first dynamic model including parameters with time dependence in the process units;
a simulator configured to simulate operation in the dynamic state using the first dynamic model and based on the simulation result, to adjust the first dynamic model;
a model converter configured to convert the adjusted first dynamic model to a second static model indicating a model of a second steady state, the second steady state indicating a state in which the input and output of the process units are fixed with time, and to store the second static model into the first storage, the first steady state indicating a steady state of the process units temporally before the second steady state;
an operating condition equalizer configured to equalize operating conditions of the process units at the time of generation of the first static model and operating conditions of the process units at the time of generation of the second static model;
a comparator configured to compare parameters included in equations indicating the first static model with parameters included in equations indicating the second static model, the first static model and the second static model having been equalized by the operating condition equalizer, and to output a comparison result; and
a display configured to display the comparison result output from the comparator.

2. The plant performance evaluation apparatus according to claim 1 , wherein the model converter is configured to remove the parameters with time dependence included in the equations indicating the adjusted first dynamic model or to make the parameters constant to convert the adjusted first dynamic model to the second static model.

3. The plant performance evaluation apparatus according to claim 1 , wherein the first static model is generated at the time the plant was designed.

4. The plant performance evaluation apparatus according to claim 1 , wherein the comparator is configured to compare the parameters included in the equations indicating the first static model with the parameters included in the equations indicating the second static model and to extract parameters having a difference.

5. The plant performance evaluation apparatus according to claim 1 , wherein the model converter is configured to convert the first static model to generate the first dynamic model.

6. The plant performance evaluation apparatus according to claim 1 , wherein the operating condition equalizer is configured to cause the operating conditions of the process units at the time of generation of the first static model to coincide with the operating conditions of the process units at the time of generation of the second static model or to cause the operating conditions of the process units at the time of generation of the second static model to coincide with the operating conditions of the process units at the time of generation of the first static model.

7. The plant performance evaluation apparatus according to claim 1 , wherein the first static model is generated at the time of operating the plant.

8. The plant performance evaluation apparatus according to claim 1 , wherein the model converter is configured to convert the first static model to the first dynamic model, based on the first static model and change history information of process units included in the plant.

9. A plant performance evaluation system comprising:
a plant performance evaluation apparatus comprising:
a first storage storing a first static model indicating a model of a first steady state, the first steady state indicating a state in which input and output of process units included in a plant are fixed with time;
a second storage storing a first dynamic model indicating a model of a dynamic state, the first dynamic model including parameters with time dependence in the process units;
a simulator configured to simulate operation in the dynamic state using the first dynamic model and based on the simulation result, to adjust the first dynamic model;
a model converter configured to convert the adjusted first dynamic model to a second static model indicating a model of a second steady state, the second steady state indicating a state in which the input and output of the process units are fixed with time, and to store the second static model into the first storage, the first steady state indicating a steady state of the process units temporally before the second steady state;
an operating condition equalizer configured to equalize operating conditions of the process units at the time of generation of the first static model and operating conditions of the process units at the time of generation of the second static model;
a comparator configured to compare parameters included in equations indicating the first static model with parameters included in equations indicating the second static model, the first static model and the second static model having been equalized by the operating condition equalizer, and to output a comparison result; and
a display configured to display the comparison results output from the comparator;

a first database storing operating conditions and process values of process units included in the plant; and
a second database storing modification history information of the process units.

10. A plant performance evaluation method using a first static model and a second static model, the first static model indicating a model of a first steady state, the first steady state indicating a state in which input and output of process units included in a plant are fixed with time, the second static model indicating a model of a second steady state, the second steady state indicating a state in which the input and output of the process units included in the plant are fixed with time, comprising:
simulating operation in a dynamic state of a plant using a first dynamic model indicating a model of the dynamic state, the first dynamic model including parameters with time dependence in the process units, and based on the simulation result, adjusting the first dynamic model;
converting the adjusted first dynamic model to the second static model;
equalizing operating conditions of the process units at the time of generation of the first static model and operating conditions of the process units at the time of generation of the second static model, the first steady state indicating a steady state of the process units temporally before the second steady state;
comparing parameters included equations indicating in the first static model with parameters included equations indicating in the second static model, the first static model and the second static model having been equalized, and outputting a comparison result; and
displaying the comparison result.

11. The plant performance evaluation apparatus according to claim 1 , wherein the process units include a heat exchanger,
the equations indicating each of the first static model, the second static model, the first dynamic model express an overall heat transfer coefficient of the heat exchanger, and
the comparator is configured to compare the overall heat transfer coefficient included in the equations indicating the first static model with the overall heat transfer coefficient included in the equations indicating the second static model, the first static model and the second static model having b

Assignees

• Yokogawa Electric Corp

Inventors

• Seki Tatenobu
• Yamamoto Mitsuhiro
• Hidaka Yoshihisa
• Ema Nobuaki

Classifications

• G05B2219/32339

  Object oriented modeling, design, analysis, implementation, simulation language · CPC title

• G05B13/041

  in which a variable is automatically adjusted to optimise the performance · CPC title

• G05B19/41885 Primary

  characterised by modeling, simulation of the manufacturing system · CPC title

• G05B23/0243 Primary

  model based detection method, e.g. first-principles knowledge model · CPC title

• G05B23/0283 Primary

  Predictive maintenance, e.g. involving the monitoring of a system and, based on the monitoring results, taking decisions on the maintenance schedule of the monitored system; Estimating remaining useful life [RUL] (preventive maintenance, i.e. planning maintenance according to the available resources without monitoring the system G06Q10/06) · CPC title