TECHNICAL FIELD

The present invention relates to a state display device for a plant and a state display method for the plant for displaying information capable of appropriately evaluating the state of a plant such as a thermal power generation facility or a facility with a compressor.

BACKGROUND

In a plant such as a thermal power generation facility or a facility with a compressor, time degradation occurs along with a long-term operation. Therefore, for a stable operation of the plant, it is desirable to grasp the degree of the time degradation and to appropriately evaluate the state of the plant. In relation to a technique of displaying the performance of the plant to be evaluated appropriately, a technique described in Patent Document 1 is known. FIG. 4 of Patent Document 1 shows a time series graph of power generation efficiency.

CITATION LIST

Patent Literature

Patent Document 1: JP2007-2673A

SUMMARY

Technical Problem

However, even if a temporal change of one parameter indicating an operation state of a plant is analyzed, since other wide variety of parameters each indicating the operation state of the plant also change complexly, it is impossible to simply compare the above-described one parameter between different times.

For example, even with the time series graph of power generation efficiency described in Patent Document 1, it is difficult to grasp a difference in performance of a gas turbine between different times.

It is an object of at least one embodiment of the present invention to provide a state display device for the plant and a state display method for the plant for displaying information capable of appropriately evaluating a temporal change in the state of a plant in consideration of a change in operation state of the plant.

Solution to Problem

(1) A state display device for a plant according to at least some embodiments of the present invention is a device for displaying a state of the plant in operation, the device including a display device for displaying a temporal change of a first parameter representing an operation state of the plant, and a correlation between the first parameter and a second parameter representing an operation state of the plant, an input device for respectively selecting and inputting a first period and a second period different from the first period in the temporal change of the first parameter, and a processing device. The processing device includes a depiction unit for displaying the temporal change of the first parameter on the display device, and for displaying, on the display device, the correlation between the first parameter and the second parameter in each of the first period and the second period input via the input device.

With the above configuration (1), it is possible to display information capable of appropriately evaluating a temporal change in the state of the plant by comparing the state of the plant defined by the first parameter and the second parameter between the selected first period and second period.

(2) In some embodiments, in the above configuration (1), the processing device includes a first approximate function calculation unit for calculating a first approximate function representing an approximate function with respect to the correlation between the first parameter and the second parameter in the first period, and a second approximate function calculation unit for calculating a second approximate function representing an approximate function with respect to the correlation between the first parameter and the second parameter in the second period, and the depiction unit is configured to display, on the display device, a graph of the first approximate function calculated by the first approximate function calculation unit and a graph of the second approximate function calculated by the second approximate function calculation unit.

With the above configuration (2), it is possible to display the approximate function for each of the selected first period and second period on the display device. Thus, it is possible to compare the two approximate functions on the display device. Accordingly, it is possible to display information enabling appropriate evaluation of the state of the plant intuitively through vision.

(3) In some embodiments, in the above configuration (1) or (2), the processing device includes a difference calculation unit for calculating a difference of the first parameter between the first period and the second period in a specified range of the second parameter if the specified range of the second parameter is input via the input device, and the depiction unit is configured to display the calculated difference on the display device.

With the above configuration (3), it is possible to display the difference of the first parameter in the specified range of the second parameter on the display device. Thus, it is possible to objectively evaluate the extent of change of the first parameter between the first period and the second period. Accordingly, it is possible to display information enabling appropriate evaluation of the state of the plant objectively.

(4) In some embodiments, in any one of the above configurations (1) to (3), the processing device includes a first correction unit for correcting the first parameter so as to match at least the second parameter with a reference value, the depiction unit is configured to display the temporal change of the corrected first parameter on the display device, and the processing device is configured to accept a selection input of the first period and the second period via the input device in the temporal change of the corrected first parameter displayed on the display device.

With the above configuration (4), it is possible to easily select the first period and the second period to be selected on the display device.

(5) In some embodiments, in any one of the above configurations (1) to (4), the processing device includes a second correction unit for correcting the first parameter so as to match at least one parameter except the second parameter with a reference value, and the depiction unit is configured to display the correlation between the corrected first parameter and the second parameter on the display device.

With the above configuration (5), it is possible to easily compare the respective correlations between the first parameter and the second parameter in the first period and the second period displayed on a display screen.

(6) In some embodiments, in any one of the above configurations (1) to (5), the depiction unit is configured to display, on the display device, the temporal change of the first parameter before correction, the temporal change of the first parameter after correction, or the temporal changes of both the first parameter before correction and the first parameter after correction to be switchable therebetween, in accordance with a display instruction input by the input device.

With the above configuration (6), it is possible to arbitrarily switch and display the type (before correction, after correction, and both before correction and after correction) of temporal change of the first parameter in accordance with an input by the user.

(7) In some embodiments, in any one of the above configurations (1) to (6), the second parameter includes a load of the plant.

With the above configuration (7), it is possible to specify the magnitude of the load of the plant, and to display information capable of evaluating the change of the first parameter between the first period and the second period when the plant is operated at a partial load (partial load state). Thus, it is possible to display the information capable of appropriately evaluating the change of the first parameter when the plant is operated at the partial load, in addition to when the plant is operated at a rated load, and to display the information capable of appropriately evaluating the state of the plant in the specified first period and second period.

(8) In some embodiments, in any one of the above configurations (1) to (7), the plant includes a thermal power generation facility, the first parameter includes thermal efficiency of the thermal power generation facility, and the second parameter includes a power generation output of the thermal power generation facility.

With the above configuration (8), it is possible to compare the thermal efficiency between the first period and the second period, and to display information capable of appropriately evaluating a temporal change of the thermal efficiency when the thermal power generation facility is operated with a power generation output less than a rated output. Accordingly, it is possible to display information capable of appropriately evaluating the state of the thermal power generation facility.

(9) In some embodiments, in any one of the above configurations (1) to (7), the plant includes a compressor, and each of the first parameter and the second parameter is any one of a temperature of air sucked in the compressor, a pressure ratio of a suction side and a discharge side of the compressor, an angle of an inlet guide vane of the compressor, a rotation speed of the compressor, or compression efficiency of the compressor.

With the above configuration (9), it is possible to display the information capable of appropriately evaluating the temporal change of the compressor by comparing the state of the compressor between the first period and the second period. Accordingly, it is possible to display the information capable of appropriately evaluating the state of the compressor.

(10) A state display method for a plant according to at least some embodiments of the present invention is a method for displaying a state of the plant in operation, the method including a temporal change display step of displaying, on a display device, a temporal change of a first parameter representing an operation state of the plant, and a correlation display step of displaying, on the display device, a correlation between the first parameter and a second parameter in each of a first period and a second period different from the first period in the temporal change of the first parameter, the first period and the second period being respectively selected and input by the input device.

With the above configuration (10), it is possible to display information capable of appropriately evaluating a temporal change in the state of the plant by comparing the state of the plant defined by the first parameter and the second parameter between the selected first period and second period.

Advantageous Effects

According to at least one embodiment of the present invention, it is possible to provide a state display device for a plant and a state display method for the plant for displaying information capable of appropriately evaluating a temporal change in the state of a plant in consideration of a change in operation state of the plant.

