Display device, control device, control method, and computer program

Abstract

The present invention makes it possible to recognize the past trend of generation of alarms. Provided is a display device for displaying an operation status of a plant, that displays statistical information of alarms generated in the plant in association with alarm types.

Description

Technical Field

[0001] The present invention relates to a display device, a control device, a control method, and a computer program for displaying information regarding alarms generated in a plant.

Background Art

[0002] In the operation of a plant, many types of alarms are generated. Patent Document 1 discloses that a large number of alarms are generated in plant monitoring.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Among alarms, there are some that do not require any treatment even when they occur because their urgency and importance are low. Therefore, when an alarm occurs, a plant operator determines whether or not to take any action against the alarm. In order to determine the necessity of taking action against an alarm, it may be effective to grasp the past occurrence tendency of the alarm.

[0005] One exemplary object of an aspect of the present invention is to provide a display device, a control device, and a control method that enable easy grasping of the past occurrence tendency of an alarm.

Means for Solving the Problems

[0006] In order to solve the above problems, a display device according to an aspect of the present invention is a display device that displays an operating state of a plant, and displays statistical information of alarms generated in the plant in association with types of the alarms.

[0007] The statistical information may include information on the change trend within a predetermined period.

[0008] The change trend may include the change trend of the average occurrence number of the alarms in the first period and the second period.

[0009] The change trend may include the change trend of the standard deviation of the occurrence number of the alarms in the first period and the second period.

[0010] The change trend may include the change trend of the maximum value of the occurrence number of the alarms per day in the first period and the second period.

[0011] The statistical information may include information on the number of days elapsed since the day when the alarm occurred first or last.

[0012] The statistical information may include information on the number of days elapsed since the day when the number of alarm dispatches per day is the largest.

[0013] The display device may display the significance or urgency of the measures for the alarms determined based on the average occurrence number of the alarms in a predetermined period and the number of days when the alarms occurred in the predetermined period.

[0014] A control device according to an aspect of the present invention is a control device that controls a display device for displaying an operating state of a plant, and includes an acquisition unit that acquires information on alarms generated in the plant, a calculation unit that calculates statistical information regarding the occurrence of the alarms for each type of the alarms based on the information acquired by the acquisition unit, and a display control unit that associates the calculated statistical information with the type of the alarms and causes the display device to display them.

[0015] The control device may include a reception unit that receives a selection of a period, and the display control unit may associate the statistical information in the selected period with the type of the alarms and cause the display device to display them.

[0016] A control method according to an aspect of the present invention is a control method for controlling a display device that displays the operating state of a plant, including acquiring information on an alarm that has occurred in the plant, calculating statistical information on the occurrence of the alarm for each type of the alarm based on the information acquired by the acquisition unit, and causing the display device to display the calculated statistical information in association with the type of the alarm.

[0017] The control method may include receiving a selection of a period, and the causing to display may include causing the display device to display the statistical information in the selected period in association with the type of the alarm.

[0018] A program according to an aspect of the present invention is a program for causing a computer to execute a control method for controlling a display device that displays the operating state of a plant, the control method including acquiring information on an alarm that has occurred in the plant, calculating statistical information on the occurrence of the alarm for each type of the alarm based on the information acquired by the acquisition unit, and causing the display device to display the calculated statistical information in association with the type of the alarm.

[0019] It should be noted that any combination of the above components, or components and expressions of the present invention, mutually replaced among a method, an apparatus, a system, a computer program, a data structure, a recording medium, etc. are also effective as aspects of the present invention.

Advantages of the Invention

[0020] According to the present invention, it is possible to provide a display device, a control device, and a control method that enable grasping of the past occurrence tendency of an alarm.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0022] Hereinafter, the present invention will be described through embodiments of the invention with reference to the drawings. However, the following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential for the solution means of the invention. The same or equivalent components, members, and processes shown in each drawing are denoted by the same reference numerals, and repeated explanations are appropriately omitted.

[0023] [Description of the Plant] FIG. 1 is a schematic diagram showing the overall configuration of the plant according to the present embodiment. First, the configuration of the plant 1 targeted by the present embodiment will be described with reference to FIG. 1. The plant 1 is, for example, a power generation plant (incineration plant) including a circulating fluidized bed boiler (Circulating Fluidized Bed type), and includes a boiler that burns fuel while circulating a circulating material such as silica sand flowing at a high temperature to generate steam. As the fuel of the plant 1, in addition to fossil fuels such as coal, for example, non-fossil fuels (wood biomass, waste tires, waste plastics, sludge, etc.) can be used. The steam generated in the plant 1 is used to drive the turbine 100. Note that the plant targeted by the present embodiment is not limited to a power generation plant or an incineration plant including a boiler, and any plant capable of acquiring process data such as a chemical plant or a wastewater treatment plant may be used.

[0024] The plant 1 is configured to burn fuel in the furnace 2, separate the circulating material from the exhaust gas by the cyclone 3 functioning as a solid-gas separation device, and return the separated circulating material to the furnace 2 for circulation. The separated circulating material is returned to the lower part of the furnace 2 via the circulating material recovery pipe 4 connected to the lower part of the cyclone 3. Note that the lower part of the circulating material recovery pipe 4 and the lower part of the furnace 2 are connected via a loop seal part 4a with a narrowed flow path. As a result, a predetermined amount of the circulating material is stored in the lower part of the circulating material recovery pipe 4. The exhaust gas from which the circulating material has been removed by the cyclone 3 is supplied to the rear flue 5 via the exhaust gas flow path 3a.

[0025] The boiler includes a furnace 2 for burning fuel and a heat exchanger for generating steam or the like using the heat obtained by combustion. A fuel supply port 2a for supplying fuel is provided in the middle part of the furnace 2, and a gas outlet 2b for discharging combustion gas is provided in the upper part of the furnace 2. The fuel supplied from a fuel supply device (not shown) to the furnace 2 is supplied into the furnace 2 through the fuel supply port 2a. Further, furnace wall tubes 6 for heating the boiler feed water are provided on the furnace wall of the furnace 2. The boiler feed water flowing through the furnace wall tubes 6 is heated by combustion in the furnace 2.

[0026] In the furnace 2, the solids containing the fuel supplied from the fuel supply port 2a flow due to the combustion and fluidization air introduced from the lower air supply line 2c, and the fuel burns at, for example, about 800 to 900 °C while flowing. The combustion gas generated in the furnace 2 is introduced into the cyclone 3 while entraining the circulating material. The cyclone 3 separates the circulating material and the gas by centrifugal separation, returns the separated circulating material to the furnace 2 through the circulating material recovery pipe 4, and sends the combustion gas from which the circulating material has been removed to the rear flue 5 through the exhaust gas flow path 3a.

[0027] In the furnace 2, a part of the circulating material called the in-furnace bed material stays at the bottom. This bed material may contain bed material with a coarse particle size unsuitable for circulating flow or combustion exhaust impurities, and poor fluidization may occur due to the bed material unsuitable as these circulating materials. Therefore, in order to suppress poor fluidization, in the furnace 2, the in-furnace bed material is continuously or intermittently discharged to the outside from the bottom discharge port 2d. The discharged bed material is supplied back to the furnace 2 after removing impurities such as metal and large particle sizes on a circulation line (not shown), or is discarded as it is. The circulating material of the furnace 2 circulates in a circulation system composed of the furnace 2, the cyclone 3, and the circulating material recovery pipe 4.

[0028] The rear flue 5 has a flow path for flowing the gas discharged from the cyclone 3 to the subsequent stage. The rear flue 5 has a superheater 10 that generates superheated steam and an economizer 12 that preheats boiler feed water as an exhaust heat recovery section for recovering the heat of the exhaust gas. The exhaust gas flowing through the rear flue 5 is cooled by heat exchange with the steam and boiler feed water flowing through the superheater 10 and the economizer 12. Further, it has a steam drum 8 in which the boiler feed water passing through the economizer 12 is stored, and the steam drum 8 is also connected to the furnace wall tube 6.

[0029] The economizer 12 transfers the heat of the exhaust gas to the boiler feed water to preheat the boiler feed water. The economizer 12 is connected to the pump 7 by a pipe 21, while being connected to the steam drum 8 by a pipe 22. The boiler feed water supplied from the pump 7 via the pipe 21 to the economizer 12 and preheated by the economizer 12 is supplied to the steam drum 8 via the pipe 22.

[0030] The downcomer 8a and the furnace wall tubes 6 are connected to the steam drum 8. The boiler feed water in the steam drum 8 descends through the downcomer 8a, is introduced into the furnace wall tubes 6 on the lower side of the furnace 2, and circulates toward the steam drum 8. The boiler feed water in the furnace wall tubes 6 is heated by the combustion heat generated in the furnace 2 and evaporates in the steam drum 8 to become steam.

[0031] A saturated steam pipe 8b for discharging the internal steam is connected to the steam drum 8. The saturated steam pipe 8b connects the steam drum 8 and the superheater 10. The steam in the steam drum 8 is supplied to the superheater 10 via the saturated steam pipe 8b. The superheater 10 uses the heat of the exhaust gas to superheat the steam to generate superheated steam. The superheated steam passes through the pipe 10a and is supplied to the turbine 100 outside the plant 1 for power generation.

[0032] The pressure and temperature of the steam discharged from the turbine 100 are lower than those of the steam discharged from the superheater 10. Although not particularly limited, the pressure of the steam supplied to the turbine 100 is about 10 to 17 MPa, and the temperature is about 530 to 570 °C. The pressure of the steam discharged from the turbine 100 is about 3 to 5 MPa, and the temperature is about 350 to 400 °C.

[0033] A condenser 102 is provided downstream of the turbine 100. The steam discharged from the turbine 100 is supplied to the condenser 102, condensed in the condenser 102 and returned to saturated water, and then supplied to the pump 7. A generator that converts the kinetic energy obtained by the rotation of the turbine 100 into electrical energy is connected to the turbine 100.

[0034] The pump 7a supplies makeup water so as to keep the water level in the condenser 102 constant. In FIG. 1, the makeup water flow rate u1 (an example of "process data") supplied by the pump 7a is shown.

[0035] The process data (data related to the operation of the plant 1) handled in this embodiment may be any data related to the plant 1. For example, it may be data (an example of "process data") obtained by measuring the state of the plant 1 with sensors. More specifically, it may include measured values such as the temperature, pressure, and flow rate of the plant 1. In FIG. 1, the boiler feed water flow rate u2 (an example of "process data") supplied from the pump 7 to the economizer 12 is shown. Further, in FIG. 1, the boiler outlet steam flow rate u3 (an example of "process data") supplied from the superheater 10 to the turbine 100 is shown, and the saturated steam flow rate u4 (an example of "process data") supplied from the steam drum 8 to the superheater 10 is shown. Note that the makeup water flow rate u1 may be controlled to follow the saturated steam flow rate u4. Also, the boiler feed water flow rate u2 may be controlled to follow the adjustment while monitoring both the boiler outlet steam flow rate u3 (or the superheated steam flow rate) and the liquid level in the steam drum 8.

[0036] When a hole occurs in the pipe system constituting the plant 1, the makeup water flow rate u1 increases, or the flow rate difference between the boiler feed water flow rate u2 and the boiler outlet steam flow rate u3 increases. The DCS (Distributed Control System, FIG. 2) 20 receives the process data of the plant 1 such as the makeup water flow rate u1, the boiler feed water flow rate u2, the boiler outlet steam flow rate u3, and the saturated steam flow rate u4 from the plant 1, monitors the operating status of the plant 1, and monitors whether an abnormality has occurred in the plant 1. As will be described later, the monitoring device 40 (FIG. 2) evaluates the process data based on the alarm determination logic set for each type of abnormality, and issues an alarm when an abnormality occurs.

[0037] Note that, although the make-up water flow rate u1, the boiler feed water flow rate u2, the boiler outlet steam flow rate u3, and the saturated steam flow rate u4 are exemplified as process data, the process data related to the plant 1 may be other data. The process data related to the plant 1 may be other data such as temperature, pressure, etc., or data calculated based on a plurality of process data, or unprocessed data acquired from a sensor or the like.

[0038] Next, the system 30 according to the present embodiment will be described with reference to FIGS. 2 and 3. FIG. 2 is a block diagram showing the configuration of the system 30 according to the present embodiment. FIG. 3 is a diagram showing the physical configuration of the system 30 according to the present embodiment.

[0039] The DCS 20 is a distributed control system for controlling the plant 1. As shown in FIG. 2, the DCS 20 acquires process data from sensors or the like provided in the plant 1, and supplies a control signal for controlling the plant 1 to the plant 1 based on the acquired data.

[0040] The system 30 includes a display device 32 and a monitoring device 40. The monitoring device 40 includes a control unit 31 and a storage unit 33. The control unit 31 includes, as functional components, for example, an acquisition unit 311, a statistical calculation unit 312, a reception unit 313, a display control unit 314, and an alarm determination unit 315. The storage unit 33 stores various data, and stores, for example, an alarm information DB 33A and an alarm statistical information DB 33B.

[0041] The acquisition unit 311 acquires process data from the DCS 20, for example. The acquisition unit 311 sequentially acquires process data from the DCS 20 during the operation of the plant 1. Note that the plant 1 is "in operation" as long as at least a part thereof is operating. Also, the operation period of the plant 1 is a period during which at least a part thereof is operating, excluding a pre-planned stop period such as maintenance.

[0042] Based on the process data acquired by the acquisition unit 311, the alarm determination unit 315 determines whether an abnormality or the like has occurred in the plant 1 and determines that an abnormality has occurred. Specifically, the alarm determination unit 315 evaluates the process data according to a preset alarm determination logic. Based on the alarm determination logic, the alarm determination unit 315 determines that an abnormality has occurred, for example, when any value included in the process data exceeds a predetermined threshold value or when a predetermined change occurs in the trend. For example, the alarm determination unit 315 evaluates predetermined process data based on the alarm determination logic and determines whether an abnormality that can occur in the plant 1, such as a rupture (a state in which metal materials such as tubes and pipes constituting the boiler are damaged and perforated, and the internal steam leaks to the outside, including a state in which a rupture is likely to occur in the future. The same applies hereinafter), has occurred.

[0043] When the alarm determination unit 315 determines that an abnormality has occurred, it outputs alarm information (hereinafter, also referred to as "alarm information") about the process data to the statistical calculation unit 312 and the display control unit 314. The alarm information is information about an alarm (warning) about the occurred abnormality and includes, for example, an alarm item (type of alarm), the date and time of the alarm occurrence, and the value of the process data related to the alarm (for example, the values of the makeup water flow rate u1 and the boiler feed water flow rate u2 determined to be abnormal).

[0044] Based on the alarm information stored in the alarm information DB 33A (and the alarm information obtained from the alarm determination unit 315), the statistical calculation unit 312 calculates statistical information regarding the occurrence of alarms for each type of alarm. The statistical information calculated by the statistical calculation unit 312 includes any statistical information regarding the abnormalities that occurred in the plant 1. The statistical information regarding the occurrence of alarms may be, for example, information on the occurrence tendency of alarms aggregated based on the alarm occurrence history. The statistical information may include, for example, at least any one of the average value of the number of alarms occurring per day, the standard deviation of the number of alarms occurring per day, or the maximum value of the number of alarms occurring per day. The above statistical values are not limited to the values per day and may be values per other periods (for example, per week, per month, or per year). Further, the statistical information may include, for example, information on the change tendency of the above statistical information in different periods.

[0045] The statistical calculation unit 312 calculates, for example, statistical information regarding the alarms that occurred in the plant 1 for each type of alarm at any preset timing (for example, the timing when an alarm occurred, daily, weekly, monthly, etc.). The types of alarms for calculating the statistical information can be classified by any method. The types of alarms may be classified, for example, for each sensor for measuring the state of the plant 1. In this case, the types of alarms may include, for example, types such as alarms regarding makeup water flow rate, alarms regarding boiler feed water flow rate, alarms regarding boiler outlet steam flow rate, alarms regarding saturated steam flow rate, and the like.

[0046] Referring to FIG. 4, a specific example of statistical information will be described. FIG. 4 shows a specific example of statistical information that can be calculated by the statistical calculation unit 312. Each statistical information can be calculated for each type of alarm. Specifically, FIG. 4 shows statistical information calculated for each of a plurality of different periods. As the plurality of different periods, for example, short term (last one week), medium term (last 1.5 months), and long term (last one year) are shown. Also shown are a plurality of types of statistical information calculated for each period. As the plurality of types of statistical information, average [times / day], standard deviation [times / day], maximum [times / day], and alarm reporting date rate [%] are shown. The meaning indicated by each statistical information is as described in FIG. 4.

[0047] Further, FIG. 4 shows information on the change tendency of statistical information for a predetermined period (for example, short term and medium term) as statistical information. The change tendency is the tendency of the change in statistical information between a certain period (the first period) and another period (the second period). The change tendency includes, for example, the change tendency of the average number of alarm occurrences between the first period and the second period. FIG. 4 shows, for example, that the value obtained by subtracting the average [times / day] for the last one year from the average [times / day] for the last one week is taken as the short-term change tendency. Also shown is that the value obtained by subtracting the average [times / day] for the last one year from the average [times / day] for the last 1.5 months is taken as the medium-term change tendency.

[0048] Note that although FIG. 4 shows the change tendency regarding the average number of alarm occurrences, it is not limited thereto. The statistical information that can be calculated by the statistical calculation unit 312 may include the change tendency of the standard deviation of the number of alarm occurrences between the first period and the second period. The change tendency of the standard deviation can be calculated by replacing the average number of alarm occurrences in the calculation of the change tendency of the average number of alarm occurrences between the first period and the second period described above with the standard deviation of the number of alarm occurrences.

[0049] Further, the statistical information calculable by the statistical calculation unit 312 may include the change trend of the maximum value of the number of alarms per day in the first period and the second period. The change trend of the standard deviation can be calculated by replacing the average number of alarms in the calculation of the change trend of the average number of alarms in the first period and the second period described above with the maximum value of the number of alarms per day.

[0050] Figure 4 further shows, as statistical information regarding the number of days elapsed since the occurrence of an alarm, the latest alarm [days], the oldest alarm [days], and the maximum alarm [days]. The latest alarm [days] is the number of days elapsed since the day when the same type of alarm last occurred (the latest day of alarm occurrence). For example, if the current date is January 20, 2020, and the latest day of occurrence of the target type of alarm is January 15, 2020, the latest alarm [days] is 5.

[0051] The oldest alarm [days] is the number of days elapsed since the day when the same type of alarm first occurred (the oldest day). For example, if the current date is January 20, 2020, and the oldest day of occurrence of the target type of alarm is January 14, 2020, the oldest alarm [days] is 6.

[0052] The maximum alarm [days] is the number of days elapsed since the day when the number of occurrences of the same type of alarm per day was the largest. For example, if the current date is January 20, 2020, and the day when the number of occurrences of the target type of alarm was the largest was January 17, 2020, the maximum alarm [days] is 3.

[0053] Returning to the description of FIG. 2. The reception unit 313 receives inputs, instructions, selections, etc. of various information according to the operations of the operator. The reception unit 313 receives, for example, an instruction for display screen transition, a designation of a planned stop period, an input, a selection, a selection of a period during which an alarm occurred for the calculation of statistical information, etc.

[0054] The display control unit 314 generates display data based on the acquired process data, alarm information, and various statistical information calculated based on the alarm information, and causes the display device 32 to display a display screen based on the display data. That is, the display control unit 314 controls the display of information regarding the operating state of the plant 1 on the display device 32, such as displaying the process data and the statistical information of the alarms, and issuing alarms. An example of the screen displayed on the display device 32 will be described later.

[0055] The alarm information DB 33A stores the alarm information acquired from the alarm determination unit 315. That is, the alarm information DB 33A stores the alarm information (alarm history information) regarding the alarms that have occurred so far. The alarm information includes, for example, the alarm item (type of alarm), the alarm occurrence date and time, and the value of the process data related to the alarm (for example, the values of the makeup water flow rate u1 and the boiler feed water flow rate u2 determined to be abnormal).

[0056] The alarm statistical information DB 33B stores the statistical information regarding the occurrence of alarms in the plant calculated by the statistical calculation unit 312. Examples of the statistical information are as described above.

[0057] The display device 32 displays various display screens including information regarding the operation of the plant 1 based on the display data supplied by the display control unit 314. The various display screens displayed by the display device 32 will be described later.

[0058] As shown in FIG. 3, physically, the system 30 includes a CPU (Central Processing Unit) 30a, a RAM (Random Access Memory) 30b, a ROM (Read only Memory) 30c, a communication unit 30d, an input unit 30e, and a display unit 30f, and these components are connected to be able to transmit and receive data to and from each other via a bus. Each functional block of the system 30 shown in FIG. 2 is realized by the physical configuration shown in FIG. 3.

[0059] In this embodiment, a case where the system 30 is configured by a single computer will be described. However, the system 30 may be realized by combining a plurality of computers. For example, in addition to the display unit 30f, a display constituting a different display unit for displaying other information may be provided. Further, the system 30 may be configured by a tablet terminal. By configuring the system 30 with a tablet terminal, the system 30 can be carried around, and for example, the system 30 can be used while touring the plant 1. Also, the configuration shown in FIG. 3 is an example, and the system 30 may have configurations other than these, or may not have some of these configurations. Also, a part of the configuration may be provided at a remote location. For example, the control unit 31 having the CPU 30a etc. may be provided at a remote location. In this case, the display device 32 having the display unit 30f etc. may be configured to acquire a control signal generated in the control unit 31 provided at a remote location via a network.

[0060] The CPU 30a is an arithmetic unit that performs control related to the execution of programs stored in the RAM 30b or the ROM 30c, arithmetic operations, and processing of data. The CPU 30a is an arithmetic unit that executes a program (monitoring program) for displaying a graph and explanatory text of the process data of the plant 1. The CPU 30a receives various data from the input unit 30e and the communication unit 30d, and displays the arithmetic result of the data on the display unit 30f or stores it in the RAM 30b.

[0061] The RAM 30b is a rewritable part of the storage unit, and may be configured by a semiconductor storage element such as DRAM or SRAM, for example. The RAM 30b may store data such as programs executed by the CPU 30a and process data of the plant 1. Note that these are examples, and other data may be stored in the RAM 30b, or some of these may not be stored.

[0062] The ROM 30c is a part of the storage unit that enables data reading, and may be composed of a semiconductor memory element such as a flash memory. The ROM 30c may store, for example, a computer program for executing various processes shown in this embodiment and data that is not rewritten. Data that is not rewritten includes, for example, information regarding Plant 1 and the specifications of the components of Plant 1. Further, the ROM 30c may store, for example, the process data of Plant 1, information regarding generated alarms, and data such as the planned stop period.

[0063] The communication unit 30d is an interface for connecting the system 30 to other devices. The communication unit 30d may be connected to a communication network such as the Internet.

[0064] The input unit 30e receives input of data according to operations by an operator and may include, for example, a keyboard and a touch panel.

[0065] The display unit 30f has a screen for visually displaying the calculation results by the CPU 30a and may be composed of, for example, an LCD (Liquid Crystal Display). The display unit 30f may display graphs and explanatory texts of process data. Further, the display unit 30f may be provided so as to constitute one screen by arranging a plurality of displays.

[0066] The computer program for executing various processes shown in this embodiment may be stored and provided in a computer-readable storage medium such as the ROM 30c, or may be provided via a communication network connected by the communication unit 30d. In the system 30, various operations included in this embodiment are realized when the CPU 30a executes a monitoring program. Note that these physical configurations are examples and do not necessarily have to be independent configurations. For example, the system 30 may include an LSI (Large-Scale Integration) in which the CPU 30a and the RAM 30b or the ROM 30c are integrated.

[0067] In addition to the configuration shown in FIG. 3, the system 30 may include a large-capacity storage device composed of an HDD (Hard Disk Drive) or the like. The data stored in the storage device is processed by the CPU 30a. Also, the data of the processing result by the CPU 30a is stored in the storage device.

[0068] FIG. 5 is a diagram showing an overview of the transition of various display screens displayed on the display device 32 in the present embodiment. As shown in FIG. 5, the display device 32 displays a login display screen DP0, a statistical information display screen DP1, and an alarm map display screen DP2. The arrows between the display screens shown in FIG. 5 indicate that each display screen transitions based on an instruction from the operator. That is, in the system 30, based on an instruction from the operator, it is possible to transition from the login display screen DP0 to the statistical information display screen DP1 and the alarm map display screen DP2. When each display screen transitions in the system 30, the previous display screen may be replaced by the next display screen, or alternatively, the previous display screen may remain and the next display screen may be displayed together. Also, the above-described display screens are examples, and the display device 32 may display display screens other than these display screens. For example, before transitioning to a certain screen shown in FIG. 5, it may transition to a screen not shown in FIG. 5 (for example, a menu screen), the statistical information display screen DP1 may have multiple types of screens, or the alarm map display screen DP2 may have multiple types of screens.

[0069] The login display screen DP0 displays information necessary for the operator to log in to the system 30. The information necessary for login is, for example, the operator's user ID and password. The login display screen DP0 accepts the input of the user ID and password from the operator. From the login display screen DP0, it is possible to transition to the statistical information display screen DP1, the alarm map display screen DP2, etc.

[0070] The statistical information display screen DP1 is a screen that displays the statistical information of the alarms generated in Plant 1 as the operating state of the plant. The statistical information displayed on the statistical information display screen DP1 is the statistical information calculated by the statistical calculation unit 312. The statistical information of the alarms displayed on the statistical information display screen DP1 may be displayed in a manner associated with the types of the generated alarms. That the statistical information is displayed in a manner associated with the types of the generated alarms means that the statistical information and the types of the alarms are displayed in such a way that the statistical information about a certain type of alarm can be easily grasped. For example, displaying the statistical information in a manner associated with the types of the generated alarms includes displaying the type of the alarm and the statistical information corresponding to the type of the alarm adjacent to each other.

[0071] The alarm map display screen DP2 is a screen displayed to assist the operator of Plant 1 in determining whether any measures need to be taken for the generated alarms. On the alarm map display screen DP2, for example, the significance or urgency of the measures for the generated alarms is displayed. The significance or urgency of the measures may be determined based on, for example, the average number of alarm occurrences in a predetermined period and the number of days on which alarms occurred in the predetermined period. A specific example of the alarm map display screen DP2 will be described later.

[0072] Next, with reference to FIG. 6, an example of the statistical information display screen DP1 displayed on the display device 32 will be described. The statistical information display screen DP1 shown in FIG. 6 includes a region R61 and a region R62.

[0073] The region R61 shows the alarm information generated in Plant 1. The alarm information displayed in the region R61 includes the date and time (occurrence date and time) of the alarm generated in Plant 1 and the item of the generated alarm (alarm item). The alarm item indicates the type of the generated alarm. In the example shown in FIG. 6, as the alarm items, for example, "Alarm A", "Alarm B", etc. are shown. Also, for the generated alarms, the occurrence date and time and the alarm item are displayed in association with each other.

[0074] The area R62 shows various statistical information of the alarms generated in the plant 1. The statistical information of the alarms includes the statistical information for the most recent one week, the most recent 1.5 months, and the past one year. The statistical information of the alarms further includes the statistical information of the change trend and the number of days elapsed. Since the meaning indicated by each statistical information has been described with reference to FIG. 4, the description of the meaning indicated by each statistical information is omitted here.

[0075] As described above, according to the present embodiment, the display device 32 displays the statistical information of the alarms generated in the plant 1 in association with the types of alarms. As a result, the operator of the plant 1 can grasp the statistical information regarding the occurrence of each type of alarm up to now. Further, based on the statistical information, the operator can grasp the occurrence trend (for example, whether it occurs frequently) of the alarm that has occurred this time, and as a result, can determine the urgency or importance of the measures against the alarm.

[0076] Further, the statistical information displayed on the display device 32 includes information on the change trend within a predetermined period (for example, short term or medium term). As a result, the operator of the plant 1 can grasp the occurrence trend of the alarms up to now, and in comparison therewith, can determine whether the alarm that has occurred this time is different from the previous trend, and can determine the urgency or importance of the measures against the alarm.

[0077] Next, with reference to FIG. 7, an example of the alarm map display screen DP2 displayed on the display device 32 will be described. FIG. 7 shows an alarm map representing the relationship between the average number of alarm occurrences (average [times / day]) in a predetermined period (for example, one year) and the ratio of the days on which the alarm occurred (reporting day rate [%]) in the same predetermined period (similarly, for example, one year). For example, the reporting day rate [%] for one year (365 days) is calculated by the following formula. Reporting day rate [%] = { (number of days on which the alarm occurred in one year) / 365} × 100

[0078] Point a1 is a point plotted (mapped) at the corresponding position on the alarm map based on the average [times / day] and reporting date rate [%] of alarms of the same type as the generated alarm for that alarm.

[0079] Also, the alarm map shown in FIG. 7 is divided into four regions, R61 to R64. R61 is a region where both the average [times / day] and the reporting date rate [%] are low. R62 is a region where the average [times / day] is low and the reporting date rate [%] is high. R63 is a region where both the average [times / day] and the reporting date rate [%] are high. R64 is a region where the average [times / day] is high and the reporting date rate [%] is low.

[0080] When the generated alarm is plotted in region R61, since the alarm is not statistically a frequently occurring alarm so far and may be an alarm different from normal, it may be determined that the urgency or importance of treatment is high.

[0081] When the generated alarm is plotted in region R62, since the reporting date rate [%] is high, it is considered to occur regularly from normal, so it may be determined that the urgency or importance of treatment is low.

[0082] When the generated alarm is plotted in region R63, since the average [times / day] is high but the reporting date rate [%] is also high, it is considered to occur regularly from normal, so it may be determined that the urgency or importance of treatment is low.

[0083] When the generated alarm is plotted in region R64, since the reporting date rate [%] is low and the average [times / day] is high, it may occur biasedly at a specific time (for example, at the startup of Plant 1). In that case, it may be determined that the urgency or importance of treatment is low.

[0084] Point a1 is shown in region R61. Therefore, according to the above, on the alarm map display screen DP2, it is shown that the alarm related to point a1 is an alarm with high urgency or importance of treatment. Similarly, according to the above, when the point corresponding to the alarm is displayed in region R62, R63, or R64, the alarm map display screen DP2 indicates that the urgency or importance of treatment for that alarm is low.

[0085] As described above, according to the present embodiment, the display device 32 displays the significance or urgency of measures for an alarm determined based on the average number of alarms generated during a predetermined period and the number of days on which an alarm occurred during the predetermined period. As a result, the operator of the plant 1 can easily determine whether to take measures against the abnormality related to the generated alarm. It is also possible to grasp the tendency of improvement or deterioration of the operating state from the change over time of the tendency of alarm occurrence using the alarm map display screen DP2 as shown in FIG. 7. For example, by comparing the alarm map display screen DP2 mapping the alarms generated in the most recent one year with the alarm map display screen DP2 mapping the alarms generated in the most recent one week, it is possible to grasp which region (which of the regions R61 to R64) of the alarm map display screen DP2 has increased or decreased in alarms compared to the most recent one year. By performing such analysis, macro and long-term plant operation management or guideline creation can be performed. Also, by changing the method of highlighting the mapped mark (for example, size) according to the impact degree of the generated alarm, it is possible to easily grasp the impact degree of the generated alarm.

[0086] [Display method] Next, with reference to the flowchart of FIG. 8, the flow of processing by the system 30 according to the present embodiment will be described. This flowchart particularly shows the flow of processing for displaying information regarding alarms generated in the plant 1. This processing is executed under the control of the control unit 31. Note that the content and order of the steps shown below are merely examples, and the operation processing is not limited thereto.

[0087] First, during the operation of the plant 1, the acquisition unit 311 acquires process data of the plant 1 from the DCS 20 (S11). The acquisition unit 311 may store the process data sequentially supplied from the DCS 20 in the storage unit 33 or the like. Thereafter, the alarm determination unit 315 evaluates the process data acquired in step S11 based on the alarm determination logic, and determines whether an alarm has occurred due to an abnormality occurring in the plant 1. If the alarm determination unit 315 determines that a predetermined abnormality has occurred in the plant 1 and it is necessary to issue an alarm (Yes in step S13), the process proceeds to step S14. In other cases (No in step S13), the processing shown in FIG. 8 ends.

[0088] In step S14, the statistical calculation unit 312 calculates statistical information regarding the generated alarm. The statistical information is calculated based on, for example, alarm information that has occurred in the past and alarm information regarding the abnormality determined to have occurred in step S13. Note that, for the calculation of the statistical information in step S14, the alarm information regarding the abnormality determined to have occurred in step S13 may not be used. Examples of the calculated statistical information and the method for calculating the statistical information are as already described with reference to FIG. 4 and the like.

[0089] Next, the display control unit 314 controls the display device 32 to display the alarm information about the abnormality determined to have occurred in step S13 and the statistical information calculated in step S14 (S15). For example, the display control unit 314 controls the display device 32 to display the statistical information of the alarms occurring in the plant 1 in association with the types of alarms. An example of the statistical information displayed by the display device 32 is as described with reference to FIG. 6 and the like.

[0090] Next, the display control unit 314 classifies the alarms about the abnormality determined to have occurred in step S13 (S16), and controls the display device 32 to display the classification result of the alarms (S17). For example, based on the average number of alarm occurrences in a predetermined period and the number of days on which alarms have occurred in the predetermined period, the significance or urgency of the measures for the alarms is determined, and the alarms are classified based on the determination result. The classification result of the alarms according to the significance or urgency of the measures is displayed on the display device 32, for example, as shown in the screen of FIG. 7.

[0091] As described above, according to the present embodiment, the display device 32 displays, for example, the statistical information of the alarms occurring in the plant 1 in association with the types of alarms. As a result, the past occurrence tendency of the alarms can be easily grasped.

[0092] As a modification of the process shown in FIG. 8, the system 30 may not perform the processes of steps S16 and S17, and an operator or the like may classify the alarms (determine the significance or urgency of the measures).

[0093] The embodiments described through the above embodiments can be appropriately combined, changed, or improved according to the application, and the present invention is not limited to the description of the above embodiments. It is clear from the description of the claims that forms with such combinations, changes, or improvements can also be included in the technical scope of the present invention.

Description of Reference Numerals

[0094] 1…plant, 2…furnace, 2a…fuel supply port, 2b…gas outlet, 2c…air supply line, 2d…discharge port, 3…cyclone, 3a…exhaust gas flow path, 4…recycle material recovery pipe, 4a…loop seal section, 5…rear flue, 6…furnace wall tube, 7…pump, 7a…pump, 8…steam drum, 8a…downcomer, 8b…saturated steam pipe, 10…superheater, 10a…tube, 12…coal saver, 13…area, 21…tube, 22…tube, 30…system, 30a…CPU, 30d…communication section, 30e…input section, 30f…display section, 31…control section, 32…display device, 100…turbine, 102…condenser, 311…acquisition section, 312…statistical calculation section, 313…reception section, 314…display control section, 315…alarm determination section

Claims

1. A display device for displaying the operating state of a plant, displaying statistical information for each type of alarm generated in the plant in a manner associated with the type of the alarm, wherein the statistical information includes information on the number of occurrences of past alarms of the same type as the alarms generated in the plant and information on the change trend of the past alarms in different periods, mapping and displaying the alarms generated in the plant on an alarm map based on a plurality of types of the statistical information regarding the number of occurrences of the past alarms of the same type as the alarms generated in the plant, a display device.

2. The display device according to claim 1, wherein the change trend includes a change trend of the average number of occurrences of the past alarms in a first period and a second period.

3. The display device according to claim 1, wherein the change trend includes a change trend of the standard deviation of the number of occurrences of the past alarms in a first period and a second period.

4. The display device according to claim 1, wherein the change trend includes a change trend of the maximum value of the number of occurrences of the past alarms per day in a first period and a second period.

5. The display device according to any one of claims 1 to 4, wherein the statistical information includes information on the number of days elapsed from the day when the past alarm occurred first or last.

6. The display device according to any one of claims 1 to 5, wherein the statistical information includes information on the number of days elapsed from the day when the number of reports of the past alarm per day is the largest.

7. The display device according to any one of claims 1 to 6, displaying the significance or urgency of measures for the alarm determined based on the average number of occurrences of the past alarms in a predetermined period and the number of days when the past alarms occurred in the predetermined period.

8. A control device for controlling a display device that displays the operating state of a plant, an acquisition unit that acquires alarm information regarding an alarm generated in the plant, a calculation unit that calculates statistical information regarding the occurrence of the alarm for each type of the alarm based on the alarm information acquired by the acquisition unit, wherein the statistical information includes information on the number of occurrences of past alarms of the same type as the alarms generated in the plant and information on the change trend of the past alarms in different periods, a calculation unit A display control unit that associates the calculated statistical information with the type of the alarm and causes the display device to display the information. The display control unit maps and displays the alarm that has occurred in the plant on an alarm map based on a plurality of types of statistical information regarding the number of occurrences of the past alarms of the same type as the alarm that has occurred in the plant. A control device comprising the same. **Claim 9** Comprising a reception unit that receives a selection of a period. The control device according to claim 8, wherein the display control unit associates the statistical information in the selected period with the type of the alarm and causes the display device to display the information. **Claim 10** A control method for controlling a display device that displays an operating state of a plant, the method comprising: Obtaining alarm information regarding an alarm that has occurred in the plant; Calculating statistical information regarding the occurrence of the alarm for each type of the alarm based on the obtained alarm information, wherein the statistical information includes information regarding the number of occurrences of past alarms of the same type as the alarm that has occurred in the plant and information regarding a change tendency of past alarms in different periods; Associating the calculated statistical information with the type of the alarm and causing the display device to display the information, and mapping and displaying the alarm that has occurred in the plant on an alarm map based on a plurality of types of the statistical information regarding the number of occurrences of the past alarms of the same type as the alarm that has occurred in the plant. A control method including the above steps. **Claim 11** Including receiving a selection of a period, The causing to display includes associating the statistical information in the selected period with the type of the alarm and causing the display device to display the information, according to the control method of claim 10. **Claim 12** A program for causing a computer to execute a control method for controlling a display device that displays an operating state of a plant, the control method comprising: Obtaining alarm information regarding an alarm that has occurred in the plant; Calculating statistical information regarding the occurrence of the alarm for each type of the alarm based on the obtained alarm information, wherein the statistical information includes information regarding the number of occurrences of past alarms of the same type as the alarm that has occurred in the plant and information regarding a change tendency of past alarms in different periods; associating the calculated statistical information with the type of the alarm and causing the display device to display the alarm, mapping and displaying the alarm generated in the plant on an alarm map based on a plurality of types of the statistical information regarding the number of occurrences of the past alarms of the same type as the alarm generated in the plant A program including the above

13. including receiving a selection of a period The program according to claim 12, wherein the causing to display includes causing the display device to display by associating the statistical information in the selected period with the type of the alarm

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