JP2022152078A - Valve health diagnostic system and method - Google Patents

Abstract

A system and method for comparing valve health indicators of multiple plants.
A valve health diagnosis system includes a valve specification information acquisition unit 1 that acquires specification information of a valve to be diagnosed, and a valve health index in a normal operating state for each valve specification as a reference valve health index. a reference valve soundness index storage unit 4 that stores data as a reference valve, a valve data acquisition unit 2 that acquires operation data of a valve to be diagnosed, and a soundness index calculation unit 3 that calculates a soundness index from the operation data of a valve to be diagnosed. a reference valve soundness index extraction unit 5 for acquiring a reference valve soundness index of a valve whose specifications substantially match the specifications of the valve to be diagnosed from the reference valve soundness index storage unit 4; and soundness of the valve to be diagnosed. A diagnosis determination unit 6 is provided for comparing the index and the reference valve health index to determine the health of the valve to be diagnosed.
[Selection diagram] Fig. 1

Description

The present invention relates to a valve health diagnosis system and method for diagnosing the health of a valve.

A technique disclosed in Patent Document 1 is an example of a system for diagnosing the soundness of a valve. The technique disclosed in Patent Document 1 collects data of valves in a process plant to determine an overall valve health parameter value, and compares the overall valve health parameter values of a plurality of valves. A relative health index of the valve to be diagnosed is determined, and the health of the valve is diagnosed based on the health index.

However, the technique disclosed in Patent Document 1 compares the operation results of valves within the same process plant. By comparing the operation results of valves operating in a plurality of plants, more reliable soundness diagnosis becomes possible. It is only possible to compare the operation results, and improvement is required.

WO2018/080867

SUMMARY OF THE INVENTION It is an object of the present invention to provide a valve health diagnosis system and method capable of comparing valve health indicators of a plurality of plants.

A valve health diagnosis system according to the present invention includes a valve specification information acquisition unit configured to acquire specification information of a valve to be diagnosed; A reference valve health index storage unit configured to store in advance as a health index; a valve data acquisition unit configured to acquire operation data of the valve to be diagnosed; and an operation of the valve to be diagnosed. a soundness index calculation unit configured to calculate a soundness index from data; and a reference valve soundness index storage unit in which the reference valve soundness index of a valve having specifications that substantially match the specifications of the valve to be diagnosed is stored in the reference valve soundness index storage unit. a reference valve health index extraction unit configured to acquire the reference valve health index when stored in the reference valve health index, and a health index of the valve to be diagnosed calculated by the health index calculation unit and a diagnostic determination unit configured to determine the soundness of the valve to be diagnosed by comparing the reference valve soundness index acquired by the reference valve soundness index extraction unit with It is characterized.

Further, one configuration example of the valve health diagnosis system of the present invention is characterized by further comprising a determination result output section configured to output a determination result of the diagnosis determination section.
Further, in one configuration example of the valve health diagnosis system of the present invention, the reference valve health index of a valve having specifications substantially matching the specifications of the valve to be diagnosed is stored in the reference valve health index storage unit. a reference valve soundness index stored in the reference valve soundness index storage unit together with specification information of the valve to be diagnosed as a reference valve soundness index when the soundness index of the valve to be diagnosed is not present It is characterized by further comprising an index registration unit.
Further, in one configuration example of the valve health diagnosis system of the present invention, the reference valve health index registration unit stores the reference valve health index of a valve having specifications that substantially match the specifications of the valve to be diagnosed. If the valve health index is not stored in the valve health index storage unit, the health index of the valve to be diagnosed is used as a reference valve health index according to the registration instruction from the user, and the specification information of the valve to be diagnosed is used as the reference valve health index. It is characterized by being registered in the valve soundness index storage unit.

Further, a valve health diagnosis method of the present invention includes a first step of acquiring specification information of a valve to be diagnosed, a second step of acquiring operation data of the valve to be diagnosed, A third step of calculating a soundness index from the operation data, and a reference valve soundness index storage section for pre-storing a soundness index of a valve in a normal operating state for each valve specification as a reference valve soundness index. If the reference valve soundness index of a valve having specifications that substantially match the specifications of the valve to be diagnosed is stored in the reference valve soundness index storage unit, the reference valve soundness index is acquired. 4, and by comparing the health index of the valve to be diagnosed calculated in the third step with the reference valve health index obtained in the fourth step, the health index of the valve to be diagnosed is determined. and a fifth step of judging soundness.

Further, one configuration example of the valve soundness diagnosis method of the present invention is characterized by further including a sixth step of outputting the determination result of the fifth step.
In one configuration example of the valve soundness diagnostic method of the present invention, the reference valve soundness index of a valve having specifications that substantially match the specifications of the valve to be diagnosed is stored in the reference valve soundness index storage unit. a seventh step of registering the health index of the valve to be diagnosed as a reference valve health index together with the specification information of the valve to be diagnosed in the reference valve health index storage unit. It is characterized.
Further, in one configuration example of the valve health diagnosis method of the present invention, the seventh step is such that the reference valve health index of a valve having specifications substantially matching the specifications of the valve to be diagnosed is set to the reference valve health index. If not stored in the index storage unit, according to a user's registration instruction, the health index of the valve to be diagnosed is used as a reference valve health index, and the specification information of the valve to be diagnosed and the reference valve health index It is characterized by including a step of registering in an index storage unit.

According to the present invention, since the soundness indices of a plurality of valves having substantially the same specifications are compared, the soundness indices of the valves of a plurality of plants operating with similar specifications are not limited to the same process plant. can be compared, and a more reliable soundness diagnosis of the valve can be performed.

FIG. 1 is a block diagram showing the configuration of a valve soundness diagnosis system according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of connection between the valve health diagnostic system according to the embodiment of the present invention and other systems. FIG. 3 is a flow chart explaining the operation of the valve health diagnosis system according to the embodiment of the present invention. FIG. 4 is a diagram for explaining an example of judgment by the diagnosis judging section of the valve health diagnosis system according to the embodiment of the present invention. FIG. 5 is a block diagram showing a configuration example of a computer that implements the valve health diagnosis system according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a valve soundness diagnosis system according to an embodiment of the present invention. A valve health diagnosis system 100 includes a valve specification information acquisition unit 1, a valve data acquisition unit 2, a health index calculation unit 3, a reference valve health index storage unit 4, and a reference valve health index extraction unit 5. , a diagnosis judgment unit 6 , a valve specification information presentation unit 7 , a soundness index presentation unit 8 , a judgment result output unit 9 , and a reference valve soundness index registration unit 10 .

FIG. 2 is a diagram showing an example of connection between the valve health diagnosis system 100 of this embodiment and other systems. Between the valve health diagnosis system 100 of the present embodiment and other systems such as the plant management systems 200-1 to 200-3, for example, HART (Highway Addressable Remote Transducer) communication and Foundation Fieldbus are used to communicate with each other. communication is enabled.

Each of the plant management systems 200-1 to 200-3 manages a large number of valves 201, stores specification information of each valve 201, and collects operation data of each valve 201. FIG.

FIG. 3 is a flowchart for explaining the operation of the valve health diagnosis system 100 of this embodiment.
First, the valve specification information acquisition unit 1 collects specification information of the valve 201 to be diagnosed from the plant management systems 200-1 to 200-3 (step S100 in FIG. 3). Information on specifications includes, for example, the type of valve 201 (globe valve, ball valve, gate valve, butterfly valve, etc.), diameter, process fluid used, working pressure, working temperature, control method (proportional control, ON/OFF control, etc.). ) and other information.
The valve specification information presentation unit 7 displays the specification information of the valve 201 to be diagnosed (step S101 in FIG. 3).

The valve data acquisition unit 2 acquires operation data of the valve 201 to be diagnosed from the plant management systems 200-1 to 200-3 (step S102 in FIG. 3).
The operation data includes, for example, an opening set value, an actual opening value, an EPM (electro-pneumatic converter) drive signal, an internal temperature of a positioner that controls a valve, an output air pressure of an actuator, and the like. As is well known, the positioner outputs a drive signal corresponding to the control command value (set opening) to the EPM, the EPM converts the drive signal into air pressure and outputs it to the actuator, and the actuator drives the valve. .

Next, the soundness index calculator 3 calculates a soundness index from the operation data of the diagnosis target valve 201 collected by the valve data acquisition unit 2 (step S103 in FIG. 3). The soundness index includes, for example, a stick-slip index, a deviation between a set opening value and an actual opening value, a sliding distance integrated value, a maximum operating speed of the valve shaft, a zero point opening difference, and the like.

The soundness index calculation unit 3 calculates the valve shaft speed from the difference between the actual opening values measured at regular time intervals, and calculates the first state quantity X, which is the average value of the absolute values of the valve shaft speed, and the valve shaft speed. A second state quantity Y, which is the root mean square of the velocity, is calculated, and a value obtained by dividing the second state quantity Y by the first state quantity X is calculated as a stick-slip index. A method for calculating such a stick-slip index is disclosed in Japanese Patent No. 3254624, for example.

The sliding distance integrated value is the integrated value of the operation distance amount of the valve shaft. The operating distance amount of the valve shaft can be calculated from the actual opening value. The actuation speed of the valve shaft can be calculated from the difference between the actual opening values per fixed time. The zero point opening difference is the opening difference between the zero point during zero point adjustment of the valve and the actual zero point when the valve is fully closed.

In this embodiment, an example in which the valve data acquiring unit 2 and the soundness index calculating unit 3 are provided inside the valve soundness diagnosis system 100 is described, but the present invention is not limited to this, and the plant management system 200 A configuration in which the valve data acquisition unit 2 and the soundness index calculation unit 3 are provided on the -1 to 200-3 side may also be used. An example of such a configuration is an example in which a positioner controlling a valve collects operational data of the valve and calculates a health index.

The soundness index presentation unit 8 displays the soundness index of the diagnosis target valve 201 calculated by the soundness index calculation unit 3 (step S104 in FIG. 3). Since the soundness index is calculated at regular time intervals, the soundness index is graphically displayed in chronological order, for example.

Next, the reference valve soundness index storage unit 4 preliminarily stores the soundness index of the valve in a normal operating state as a reference valve soundness index for each valve specification. A method of registering this reference valve soundness index will be described later.

The reference valve soundness index extraction unit 5 extracts the reference valve soundness index of the valve specification that substantially matches the specification of the diagnosis target valve 201 indicated by the information collected by the valve specification information acquisition unit 1 in step S100. It is determined whether or not it is stored in the storage unit 4 (step S105 in FIG. 3). As described above, valve specification information includes type, bore, process fluid, operating pressure, operating temperature, and control method information. In order to judge whether or not the specifications approximately match, predetermine the range in which the process fluid, operating pressure, operating temperature, and control method can be considered to approximately match the specifications for each valve type (type, caliber). do it.

The reference valve soundness index extraction unit 5 determines that the reference valve soundness index storage unit 4 stores a reference valve soundness index of valve specifications that substantially match the specifications of the valve 201 to be diagnosed (YES in step S105). , this reference valve soundness index is obtained from the reference valve soundness index storage unit 4 (step S106 in FIG. 3).

Next, the diagnosis determination unit 6 determines the difference between the health index of the valve 201 to be diagnosed calculated by the health index calculation unit 3 and the reference valve health index acquired by the reference valve health index extraction unit 5. It is determined whether or not there is a difference (step S107 in FIG. 3).

When the health index of the valve 201 to be diagnosed is within the range of the reference valve health index (NO in step S107), the diagnosis determination unit 6 determines that the valve 201 to be diagnosed is healthy (step S108 in FIG. 3). ). Further, when the soundness index of the valve 201 to be diagnosed is outside the range of the reference valve soundness index (YES in step S107), the diagnosis determination unit 6 determines that the valve 201 to be diagnosed has an abnormality. (Step S109 in FIG. 3).

As mentioned above, there are multiple types of soundness indicators, such as stick-slip index, deviation between set value and actual value of opening, integrated value of sliding distance, maximum operating speed of valve shaft, and difference in zero point opening. If there is a soundness index, the comparison in step S107 is performed for each type of soundness index. It may be determined that the valve 201 is abnormal.

The determination result output unit 9 outputs the determination result of the diagnosis determination unit 6 (step S110 in FIG. 3). As an output method, there are the display of the determination result, the transmission of information indicating the determination result to the outside, and the like.

FIG. 4 is a diagram for explaining an example of determination by the diagnostic determination unit 6. As shown in FIG. Here, it is assumed that the time-series data of the soundness index of the valves A, C, and D are registered as the reference valve soundness index. Each valve has different specifications. Also, the time on the horizontal axis is relative time based on, for example, the diagnosis start time, and the time on the horizontal axis differs depending on the valve.

Here, it is assumed that the soundness index data of the valve B having specifications that substantially match those of the valve D are obtained as shown in FIG. Since the soundness index of valve B is out of the range of the soundness index of valve D, it is determined that valve B is abnormal.

On the other hand, if the reference valve soundness index of the valve specification that substantially matches the specification of the valve 201 to be diagnosed is not stored in the reference valve soundness index storage unit 4 (NO in step S105), the reference valve soundness index registration unit 10 inquires of the user of the valve health diagnosis system 100 whether or not to register the health index of the valve 201 to be diagnosed calculated by the health index calculator 3 as a reference valve health index (step S111 in FIG. 3). ).

For example, when the user looks at the displayed specification information and soundness index data and determines that the valve 201 to be diagnosed appears to be normal, he/she instructs to register it as a reference valve soundness index.

When the user instructs registration (YES in step S111), the reference valve health index registration unit 10 sets the health index of the valve 201 to be diagnosed as the reference valve health index, and registers the specifications of the valve 201 to be diagnosed. It is registered in the reference valve soundness index storage unit 4 together with the information (step S112 in FIG. 3).
The valve health diagnosis system 100 performs the processing of FIG. 3 as described above at regular time intervals.

As described above, in this embodiment, the soundness indexes of a plurality of valves whose specifications are substantially identical are compared, and a valve that deviates from the reference valve soundness index is determined to be an abnormally operating valve. It is possible to compare the health index of the valves of a plurality of plants operating with similar specifications, and to perform a more reliable health diagnosis of the valves.

It is not necessary to collect the specification information of the valve to be diagnosed each time the diagnosis is made. For example, if a unique identification number (valve ID) is assigned to each valve, once the valve ID and valve specification information are acquired and registered in the reference valve soundness index storage unit 4, then can identify the valve to be diagnosed only by acquiring the valve ID, and can acquire the specification information of the valve to be diagnosed from the reference valve soundness index storage unit 4 .

Further, in this embodiment, only when the reference valve soundness index of the valve specification substantially matching the specification of the valve to be diagnosed is not stored in the reference valve soundness index storage unit 4, the diagnosis target valve is determined according to the instruction from the user. Although the valve soundness index is registered as the reference valve soundness index in the reference valve soundness index storage unit 4, the valve soundness index determined to be sound in step S108 may be registered as the reference valve soundness index. good.

For example, if the valve to be diagnosed is determined to be a sound valve in step S108, the reference valve soundness index registration unit 10 allows the user to determine whether or not to register the soundness index of the valve to be diagnosed as the reference valve soundness index. and when the user instructs registration, the health index of the valve to be diagnosed is additionally registered in the reference valve health index storage unit 4 together with the specification information of this valve. This makes it possible to increase the number of sample data of the reference valve soundness index with the same or substantially matching specifications.

The valve health diagnosis system described in this embodiment can also be realized by cloud computing, and at least a CPU (Central Processing Unit), a computer equipped with a storage device and an interface, and a computer that controls these hardware resources It can be implemented by a program. A configuration example of this computer is shown in FIG.

The computer includes a CPU 300 , a storage device 301 and an interface device (I/F) 302 . The I/F 302 is connected to the hardware of the valve specification information presenting unit 7, the soundness index presenting unit 8, the determination result output unit 9, plant management systems 200-1 to 200-3, and the like. A program for realizing the valve soundness diagnosis method of the present invention is stored in the storage device 301 . The CPU 300 executes the processing described in this embodiment according to the programs stored in the storage device 301 .

INDUSTRIAL APPLICABILITY The present invention can be applied to techniques for diagnosing the soundness of valves.

1 valve specification information acquisition unit 2 valve data acquisition unit 3 soundness index calculation unit 4 reference valve soundness index storage unit 5 reference valve soundness index extraction unit 6 diagnosis determination unit 7 ...Valve specification information presentation unit 8...Soundness index presentation unit 9...Determination result output unit 10...Reference valve health index registration unit 100...Valve health diagnosis system 200-1 to 200-3...Plant management System, 201... valve.

Claims (8)

a valve specification information acquisition unit configured to acquire specification information of a valve to be diagnosed;
a reference valve health index storage configured to store in advance a health index of a valve in a normal operating state for each valve specification as a reference valve health index;
a valve data acquisition unit configured to acquire operation data of the valve to be diagnosed;
a soundness index calculation unit configured to calculate a soundness index from operation data of the valve to be diagnosed;
When the reference valve health index of a valve having specifications substantially matching the specifications of the valve to be diagnosed is stored in the reference valve health index storage unit, the reference valve health index is acquired. a reference valve health index extractor;
By comparing the health index of the valve to be diagnosed calculated by the health index calculation unit and the reference valve health index acquired by the reference valve health index extraction unit, the valve to be diagnosed a valve health diagnostic system configured to determine the health of the valve. The valve health diagnostic system according to claim 1,
A valve soundness diagnosis system, further comprising a determination result output unit configured to output a determination result of the diagnosis determination unit. In the valve health diagnosis system according to claim 1 or 2,
When the reference valve soundness index of a valve having specifications that substantially match the specifications of the valve to be diagnosed is not stored in the reference valve soundness index storage unit, the soundness index of the valve to be diagnosed is set to the reference valve. A valve health diagnosis system, further comprising: a reference valve health index registration unit configured to register a health index together with specification information of the valve to be diagnosed in the reference valve health index storage unit. . In the valve health diagnosis system according to claim 3,
The reference valve soundness index registration unit receives the reference valve soundness index from the user when the reference valve soundness index of the valve whose specification substantially matches the specification of the valve to be diagnosed is not stored in the reference valve soundness index storage unit. and registering the health index of the valve to be diagnosed as a reference valve health index together with the specification information of the valve to be diagnosed in the reference valve health index storage unit according to the registration instruction. sex diagnosis system. a first step of acquiring specification information of a valve to be diagnosed;
a second step of acquiring operating data of the valve to be diagnosed;
a third step of calculating a soundness index from the operation data of the valve to be diagnosed;
By referring to a reference valve soundness index storage unit that stores in advance a soundness index of a valve in a normal operating state for each valve specification as a reference valve soundness index, a valve with specifications that substantially match the specifications of the valve to be diagnosed. a fourth step of acquiring the reference valve health index if the reference valve health index of is stored in the reference valve health index storage unit;
The soundness of the valve to be diagnosed is determined by comparing the soundness index of the valve to be diagnosed calculated in the third step with the reference valve soundness index obtained in the fourth step. and a fifth step. In the valve health diagnosis method according to claim 5,
A valve soundness diagnosis method, further comprising a sixth step of outputting the determination result of the fifth step. In the valve health diagnosis method according to claim 5 or 6,
When the reference valve soundness index of a valve having specifications that substantially match the specifications of the valve to be diagnosed is not stored in the reference valve soundness index storage unit, the soundness index of the valve to be diagnosed is set to the reference valve. A method for diagnosing valve health, further comprising a seventh step of registering the health index together with the specification information of the valve to be diagnosed in the reference valve health index storage unit. In the valve health diagnosis method according to claim 7,
In the seventh step, when the reference valve soundness index of the valve whose specifications substantially match the specifications of the valve to be diagnosed is not stored in the reference valve soundness index storage unit, registration by the user is performed. a step of registering the health index of the valve to be diagnosed as a reference valve health index together with the specification information of the valve to be diagnosed in the reference valve health index storage unit according to the instruction. method of sex diagnosis.

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