JPH0895632A - Plant operation support device - Google Patents

Abstract

PURPOSE: To eliminate such a detect that finally causes a plant trip by sorting extracted items for every emergency and semi-emergency item by an emergency judging means and then rearranging these sorted items in order of higher priority for output and display of them. CONSTITUTION: In step S1, the support items occurring now in a plant are extracted, and they are checked on whether these extracted items trip in three minutes or not in step S2. The items which trip in three minutes are rearranged in order of higher importance. The items having no trip within the minutes are checked on whether they trip in 30 minutes or not in step S4. These checked items are rearranged in order of higher importance. Thus, the support contents 11, 12 and 13 of steps S3, S5 and S6 which are rearranged in order of higher importance are set in that order by an arithmetic means 4 and then shown by a display means 5. Thereafter, these steps are repeated at each prescribed time for execution of an operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention evaluates the priority of support contents in a driving support device such as a power plant, and preferentially extracts those which cause trouble in operation due to rapid progress of plant abnormality. The present invention relates to a plant operation support device.

[0002]

2. Description of the Related Art In a conventional power plant operation support device, if the support items are left untreated, the machine may be damaged,
Or, priorities are set in descending order of the degree of influence that may lead to a personal injury, for example, a priority storage device is provided in the driving support device, and the predetermined priority is stored here, and the abnormality diagnosis result is displayed. With reference to this priority data, the display etc. were performed in this order.

Therefore, the priority has been fixed irrespective of the plant state when the support was generated. Then, in the conventional plant operation support device, when two or more different supports occur at the same time, the support content having a high priority is first displayed on the display device to notify the operator, and the operator has a high priority. The support (abnormal event) was resolved first, and then the support (abnormal event) with the next lowest priority was resolved.

[0004]

In the prior art, as described above, the priority of the support item is fixed regardless of the plant state when the support is generated. Therefore, even if the priority is high, the progress of the abnormality is slow and the operator has time to operate, and if the priority is low, the progress of the abnormality is fast and the operation requiring the operator's operation is urgent. When they occur at the same time, the driving assistance device simply displays the assistance contents in descending order of priority, so that the operator follows the display and only sees the operation guide that is displayed preferentially and has time to prioritize this. However, there is a possibility that the plant may trip during the period when the urgent operation guide is overlooked.

That is, FIG. 5 is a system diagram of a general multi-axis companion cycle plant, and it is assumed that the following two alarms are simultaneously generated in such a system.

(1) The degree of vacuum of the condenser 30 becomes low.

(2) The water level of the high-pressure drum 31 becomes low.

Considering the degree of danger and the degree of influence on the plant, it is considered that the above-mentioned two alarms are greater in the condenser low vacuum alarm of (1). When the condenser vacuum is further reduced, the steam turbine trips (eg 650 mm
Hg will give an alarm and 560mmHg will trip), and all the operating gas turbines will trip. Even if the water level of the high-pressure drum further decreases in (2), the boiler steam stop valve of that series closes, and only the gas turbine 32 of that series trips, and the other gas turbines are not affected at all and combined. Cycle operation can be continued.

However, the above two alarms are completely different in system. That is, as shown in FIG. 6 (a), the condenser vacuum degree has a gradual downward tendency, and there is a time margin until the trip, and as shown in (b), the high pressure drum water level has a rapid downward tendency. There may be a case where the recovery operation is urgent as in the case of (b) because there is not enough time before the trip.

In this case, in the conventional driving support device,
Since the condenser low vacuum alarm in (1) has a higher priority,
The contents of support for low condenser vacuum in (1) are displayed first. Therefore, the water level of the high-pressure drum further decreases while the operator concentrates on the recovery operation related to the low condenser vacuum,
There was a problem that the gas turbine 32 of that series might trip.

[0011]

In order to solve such a problem, the present invention provides a plant operation support device,
A support item extraction means and a first urgency determination means are provided for the extracted support items, and those with an urgent priority are determined. Further, a second determination is made as to whether or not the support item determined to be negative by the first urgency determination means meets the quasi-urgentness criterion.
Urgent degree judgment means will be provided. A configuration is provided in which an arithmetic means for arranging the support items determined by both of these determination means in descending order of importance and an output means for outputting the result of arithmetic operation by the arithmetic means are provided.

That is, the present invention, in a driving support device for diagnosing a state of a plant, outputting a diagnosis result, and supporting the operation of the plant, a support extraction means for taking in a support item generated from the plant, A first urgency determination means for determining whether or not the support items extracted by the support extraction means meet a urgency level criterion that requires treatment within a predetermined short time; and the first urgency level Secondly, it is determined whether or not the support item that has been denied by the determination means conforms to the criterion of the quasi-urgent level, which has a time margin more than the criterion of the urgency level.
Urgent degree determining means, and the emergency assistance items determined to meet the respective criteria by the first and second determining means,
For each of the quasi-urgent assistance items and the other assistance items determined by the second urgency determination means not to meet the criteria of the quasi-urgency level, calculation means for arranging in order of importance, Provided is a plant operation support device comprising an output means for arranging and outputting a support item, a quasi-urgent support item, and other support items in this order.

[0013]

In the plant operation support device, the conventional support items are arranged and displayed in descending order of the degree of danger and the degree of influence on the plant, and the operator operates in this order. Furthermore, these support items are taken in by the extraction means, and the one with the highest urgency is selected by the first urgency determination means. This urgency criterion is, for example, “3
Whether or not the plant trips within a minute ”is determined. As a result of the determination, the support item that trips within 3 minutes is sent to the computing means, and if not, the second urgent level determining means determines the quasi-urgent level. This judgment is
For example, the criterion is “whether or not the plant trips within 30 minutes”. As a result of the determination, the support item that trips within 30 minutes and the item that does not trip are selected and sent to the computing means. That is, the urgency of the handling operation is divided into the following three stages (a), (b), and (c).

(A) Immediate response operation Required support items (for example, a plant trip within 3 minutes).

(B) Immediate on-site inspection Required support items (for example, a plant trip within 30 minutes).

(C) Pattern view support items (for example, 30
Things that do not lead to a plant trip within minutes).

In the computing means, with respect to the three stages classified above, (a) with respect to the support items that require immediate action, the priority is increased in the descending order of the risk and the effect on the plant. wear. Next, (b)
Immediately on-site inspection For support items that are necessary, similarly attach priority in order of importance. Next, regarding the support items in the pattern view (c), the priorities are similarly sequentially attached in the order of importance.

As described above, the computing means gives priority to the currently occurring support items, sorts them in descending order of priority, and displays only the support contents on the output means. If you see this and operate according to the display, the situation where the plant trips can be avoided.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a flowchart of a configuration and a support priority evaluation of a plant operation support device according to an example of the present invention. In the figure, the configuration of the present invention includes support extraction means 1, urgency determination means 2 and 3, calculation means 4, display means 5
It is composed of In such a configuration, first,
In S1, the support currently occurring in the plant is extracted. Next, in S2, first, it is checked whether or not the support that is occurring is to be tripped within 3 minutes. If the trip is within 3 minutes, in S3, the degree of importance of the trip within 3 minutes is determined. Arrange in descending order, or 3
If it does not trip within a minute, proceed to S4. S
In 4, the next step is to check whether the trip will occur within 30 minutes. If it trips within 30 minutes, proceed to S5 and arrange them in descending order of importance. If not trip within 30 minutes, proceed to S6 and arrange them in descending order of importance. .

As described above, the support contents 11, 12, and 13 of S3, S5, and S6, which are arranged in descending order of importance, are displayed on the display unit 5 in the calculation unit 4 in the order of 11, 12, and 13, respectively. Thereafter, these steps are repeated and calculated every Δt time.

FIG. 2 is a diagram for explaining a method of evaluating and determining whether or not the plant trips within 3 minutes of the emergency level judging means 2 in FIG. In FIG. 2A, the horizontal axis represents time (t) and the vertical axis represents the state quantity of the plant. A black circle 20 is a sampling value of the state quantity at every Δt time, and a triangle 21 is an average of the sampling values. As shown in FIG. 6B, the average value is obtained for each Δt time within 1 minute before, 1 minute or more and within 2 minutes before, and 2 minutes or more and within 3 minutes before. T ^{H on the} vertical axis is a set value of the plant trip, and the plant trips when the state quantity exceeds T ^H. A ^H is an alarm set value, and an alarm is issued when this value is exceeded.

2A and 2B, the process current value and the process average value are taken at three points, and when the following conditions are satisfied, it is determined that the plant trips within 3 minutes.

[0023]

[Equation 1]

In the above, the equations (1 ') and (3') are equations in the case where an abnormality occurs due to the reduction of the state quantity, and in this case, the trip is also a subject. or,
The coefficients 0.67 and 0.33 in the equations (3) and (3 ') are unique to the plant and change depending on the type of the plant.

By the calculation in the urgency determination means 2 as described above, the ones that trip within 3 minutes and those that do not trip are classified, and the processing is performed according to the flowchart shown in FIG.

Next, FIG. 3 is a diagram for explaining a method for evaluating and evaluating whether or not the plant will trip within 30 minutes by the emergency level judging means 3 in FIG. In FIG. 3A, the horizontal axis represents time (t), the vertical axis represents the state quantity of the plant, 22 indicated by black circles is the sampling value of the state quantity at every Δt time, and the triangle mark 23 is the average of the sampling values. By value,
(B) As shown in the figure, 10 minutes before the present, 10
The average value is obtained for each Δt time of 20 minutes or more and 20 minutes or less and 20 minutes or more and 30 minutes or less. T ^{H on the} vertical axis is a set value of the plant trip, and the plant trips when the state quantity exceeds T ^H. A ^H is an alarm set value, and an alarm is issued when this value is exceeded.

In FIGS. 3 (a) and 3 (b), the process current value and the process average value are taken as three points, and when the following conditions are satisfied, it is determined that the plant trips within 30 minutes.

[0028]

[Equation 2]

In the above, (1 '') and (3 '')
The formula is a formula in the case where an abnormality occurs due to a decrease in the state quantity, and in this case as well, it is a target of the trip.
In addition, the coefficients of the equations (3 ′) and (3 ″) of 0.67 and 0.
Similarly to the above, 33 is unique to the plant and changes depending on the type of the plant.

By the calculation in the urgency determination means 3 as described above, those that trip within 30 minutes and those that do not trip are classified, and the processing is performed according to the flowchart shown in FIG.

In the present embodiment as described above, the plant example shown in FIG. 5 will be explained. First, the plant having a high risk and a large influence on the plant is preferentially selected as in the conventional case. That is, it is determined that the vacuum low alarm of the condenser 30 has a higher risk and a greater influence on the plant than the low water level alarm of the high-pressure drum 31. Subsequent to this determination, the urgency determining means 2 and 3 further evaluate how much time the plant trip will take after the determination according to the flowchart of FIG. 1, and divide the urgency level of the corresponding operation into the following three stages.

(A) Immediate action required (plant trip within 3 minutes).

(B) Immediate on-site inspection is required (plant trip within 30 minutes).

(C) View of the pattern (no plant trip within 30 minutes).

Next, in the calculating means 4, FIG.
If the water pressure level of the high-pressure drum is suddenly decreasing and the condenser vacuum level in (a) is gradual, the assistance regarding the low water level warning of the high-pressure drum is determined as (a) immediate action is required, and Assistance related to the water-vessel low-vacuum alarm is determined as (c) pattern view.

As in the case of the above determination, (a) the support item that requires immediate response operation is determined to have a high priority.
As shown in (b), the water pressure level of the high-pressure drum drops sharply, and
When the degree of decrease in the condenser vacuum degree is gentle as in (a), the support for the high pressure drum low water level alarm in FIG. 6 (b) is more relevant to the condenser vacuum low level alarm in FIG. 6 (a). It is determined that the priority is higher than the support, and the driving support device first displays the support content regarding the low water level of the high-pressure drum by the display unit 5.

In this way, the operator can first display the contents of assistance which has no time before the trip and the recovery operation is urgent.

FIG. 4 is a diagram for generally explaining the support priority evaluation in the embodiment described above. In the figure, first, as in the conventional case, the assistances A, B, C, to L are arranged in descending order of the degree of danger and the degree of influence on the plant, the presence / absence 24 of the occurrence is checked, and 25 As shown in the operation urgency level, (a) immediate action is required (the plant will trip within 3 minutes),
(B) Immediate site inspection is required (plant will trip within 30 minutes), and (c) pattern view (trip will not occur within 30 minutes).

Next, with reference to the presence / absence 24 of the occurrence and the operation urgency level 25, the priority of the currently occurring item is selected in descending order of priority, and as shown at 26, the assistance E, G,
It will be displayed in the order of D, I, K, A, B.

In the embodiment described above, the trip determination time is set to 3 minutes and 30 minutes, but the trip determination time is not limited to this time, and the aim of the present invention is to immediately respond. The purpose is to distinguish between urgent ones, quasi-urgent ones that have some time to deal with, and ones with a pattern view. These three minutes, thirty minutes, etc. are the nature of the plant. Therefore, it may be changed to, for example, 40 minutes and 1 hour. Also, although it is divided into urgent and quasi-urgent, it may be further subdivided in some cases.

Further, the plant operation support device of the present invention has been described as the functions of the support extraction means, the urgency extraction means, the calculation means, and the display means, respectively, as described above, but these means are respectively dedicated circuits and calculations. Of course, the device may be used, or the support extraction means, the urgency extraction means, and the calculation means may be implemented by software by a computer, and may be implemented in combination with a display device or the like.

Further, the present invention is not limited to the above-mentioned multi-screw type combined plant, but can be applied to various thermal power plants, and a plant for controlling a plurality of state quantities, for example, a nuclear plant, a chemical plant, a steelmaking plant. It is applied to plants and the like.

[0043]

As described above in detail, in the present invention, in the plant operation support device, the support item extraction means and the first and second urgency determination means for determining the extracted items are used. It is divided into emergency items and quasi-urgent items, and these items are arranged in descending order of priority by the computing means, output by the output means, and displayed. The support contents that require the operator to take immediate action will be displayed first, and the problem that the plant trip will occur while the operator is taking other action is eliminated. It is possible.

[Brief description of drawings]

FIG. 1 is a flowchart of a plant operation support device according to an embodiment of the present invention.

2A and 2B are explanatory views of an evaluation method in an emergency level extraction means in a plant support apparatus according to an embodiment of the present invention, in which FIG. 2A shows the relationship between time and state quantity, and FIG. 2B shows the relationship between average time. Show.

FIG. 3 is an explanatory diagram of an evaluation method in the semi-urgentness extraction means in the plant support device according to the embodiment of the present invention, (a)
Shows the relationship between time and state quantity, and (b) shows the relationship between average time.

FIG. 4 is a diagram showing an example of a support priority evaluation result according to an embodiment of the present invention.

FIG. 5 is a general system diagram of a combined cycle plant.

6 is a diagram showing state quantities in the system diagram of FIG.
(A) shows the condenser vacuum degree, and (b) shows the high-pressure drum water level.

[Explanation of symbols]

 1 Support Extracting Means 2 Urgency Determining Means 3 Urgency Determining Means 4 Computing Means 5 Display Means

Claims (1)

[Claims] 1. In a driving support device for diagnosing a state of a plant, outputting a diagnosis result, and supporting the operation of the plant, a support extraction unit for capturing a support item generated from the plant, and the support extraction unit. The first urgency level determining means and the first urgency level determining means determine whether or not the support items extracted in step 4 meet the urgency level criteria that require treatment within a predetermined short time. Second urgency determination means for determining whether or not the support item that has become compliant with the quasi-urgency standard having a time margin more than the urgency standard, and the first and second Each of the emergency assistance item and the quasi-urgent assistance item determined to meet the respective criteria by both determination means, and the other assistance items determined to not match the quasi-urgency criterion by the second urgency determination means About the most important A plant operation support apparatus comprising: an arithmetic means for arranging and an output means for arranging and outputting the operation results in the order of the emergency assistance item, the quasi-emergency assistance item, and other assistance items.