JPH0685198B2 - Plant equipment condition monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a plant equipment condition monitoring device for monitoring the status of process equipment having three mutually related process equipment quantities.

[Conventional technology]

In various plants, equipment having three mutually related process equipment quantities is often used. For example, a pump or a fan has three process equipment quantities such as a discharge flow rate, a discharge pressure (head), and a rotation speed. As described above, three-dimensional display is known to monitor the state of the process equipment having three process equipment quantities. Three-dimensional display is described in, for example, Japanese Patent Laid-Open No. 165112
It is described in Japanese Patent Publication No.

[Problems to be solved by the invention]

The flow rate and pressure of pumps and fans change depending on the operating point. On the other hand, in order to secure the predetermined flow rate and the predetermined pressure, the speed (rotation speed) is controlled. However, due to the secular change of the equipment, the flow rate and pressure decrease even if the rotation speed is kept constant. In other words, it is necessary to increase the rotation speed in order to obtain the predetermined flow rate and the predetermined pressure. Such a characteristic change has a problem that it cannot be accurately grasped by only displaying the process equipment quantity of the process equipment three-dimensionally.

An object of the present invention is to provide a plant equipment state monitoring device capable of accurately grasping the state of process equipment.

[Means for solving problems]

Three process equipment quantities are detected, and two of the process equipment quantities are defined as two-dimensional coordinates having an X axis and a Y axis. on the other hand,
The detected value of the remaining one process equipment quantity is compared with the theoretical value to obtain the process equipment quantity deviation. This process equipment quantity deviation is displayed with an area (for example, a circle) centered on the intersection of two process equipment quantities.

[Action]

The area of one process equipment quantity deviation is displayed in a size proportional to the deviation. By visually observing the size of this area, it is possible to accurately grasp the characteristic deterioration of the process equipment. Desirably, if the device life limit value or the deterioration alarm limit value is displayed at the same time as the process device amount deviation, the device characteristic change can be more accurately grasped.

〔Example〕

FIG. 1 shows an embodiment of the present invention. FIG. 1 shows an example in which the process equipment is a pump.

In FIG. 1, a flow rate Q, a water head (pressure) H, and a rotation speed N, which are process equipment quantities of a pump (not shown), are detected and input to a level conversion circuit 6 via a process input device 1. The level conversion circuit 6 converts the process equipment amount detection values Q, H, N into the signal processing level of the arithmetic processing unit 2. The flow rate detection value Q and the water head detection value H are input to the theoretical value calculation circuit 7, the control value calculation circuit 9 and the screen display processing circuit 11. The theoretical value calculation circuit 7 takes in theoretical device data corresponding to the flow rate Q and the water head H from the data file 3 and obtains a theoretical rotational speed value N _R. The rotation speed detection value N output from the level conversion circuit 6 is input to the speed deviation calculation circuit 8. The speed deviation calculating circuit 8 is a deviation ΔN (deviation of process equipment amount) between the theoretical value N _{R of the} number of revolutions and the detected value N.
Is given to the screen display processing circuit 11. Control value calculation circuit 9
Takes the device alarm limit data I _A and the device life limit data I _C from the data file 3 and finds the limiting speeds N _A and N _C at the operating point from the flow rate detection value Q and the water head detection value H, and then the deviation alarm limit Calculate the value ΔN _A and the deviation life limit value ΔN _C.
The limit value calculation circuit 9 also calculates the circular radius r _A for displaying the deviation alarm limit value, the circular radius r _C for displaying the deviation life limit value, and the circular area A _{C for the} deviation life limit value. Details of the calculation performed by the limit value calculation circuit 9 will be described later.
The screen display processing circuit 11 determines the display content on the CRT 4 based on the input information. The display screen selection circuit 10 gives a screen display request command to the screen display processing circuit 11 based on request information from the keyboard 5 operated by the operator.

Next, the operation will be described with reference to the flow chart shown in FIG.

The process input device 1 periodically measures the flow rate Q, the head H, and the rotation speed N. The theoretical value calculation circuit 7 is a data file 3.
Theoretical instrument data Is is taken in from and the theoretical rotational speed N _R is obtained based on the flow rate detection value Q and the water head detection value H. This relationship is third
It can be represented as shown. Figure 3 shows head H and flow rate Q
And the number of revolutions N are three-dimensionally displayed as one axis. The theoretical number of revolutions when the flow rate is Q ₀ and the head is H ₀ is N _R
I am trying. The rotation speed detection value at this time is N. The speed deviation calculation circuit 8 calculates the deviation ΔN between the rotation speed detection value N and the theoretical value N _R.
Ask for. As the pump ages, the number of revolutions increases to ensure the same flow rate and head. In FIG. 3, the detected rotational speed N is higher than the theoretical rotational speed N _R. On the other hand, the limit value calculation circuit 9 takes in the device alarm limit data I _A and the device life limit data I _C from the data file 3, and the deviation alarm limit value Δ
Calculate N _A and the deviation life limit value ΔN _{C according} to the relationship of the following equation.

_{ΔN A = N A -N R ...} (1) ΔN C = N C -N R ... (2) N A: alarm limit N _C: lifetime limit Now, the rotational speed detection value N and the theoretical rotational speed N _R Deviation ΔN between
Exists. A circle is displayed in order to display the speed deviation on a two-dimensional coordinate with Q-H as the X-Y axis.

This will be described with reference to FIG. A circular area corresponding to the lifetime limit value N _C so as to draw a cone towards at the theoretical rotational speed N _R as A _C. If the radius r _{C of} the circle corresponding to the life limit value N _C is used, the area A _C can be calculated by the following equation.

A _C = πr _C ² (3) If the judgment of the circle corresponding to the life limit value N _C is γ, the radius of the circle corresponding to the alarm limit value N _A can be calculated by the following formula.

Further, the radius γ of the circle representing the speed deviation ΔN at the actual rotation speed N is obtained by the following equation.

If these two-dimensional coordinates are shown, they can be expressed as shown in FIG.

The limit value calculation circuit 9 performs calculation based on the above idea and gives it to the screen display processing circuit 11 as information. The double-sided display processing circuit 11 executes the following processing based on the flow rate Q, the water head H, the speed deviation ΔN, and the limit value calculation circuit 9 information. The contents of this processing will be described with reference to FIG.

First, in step S1, speed deviation ΔN and deviation information limit value ΔN
And the speed deviation ΔN is small, the process proceeds to step S2. At step S2, it is determined whether the operator has requested the display of the current status from the keyboard 5. If there is no display request, no processing is performed and the process ends. When the operator makes a display request from the keyboard 5, it is given to the screen display processing circuit 11 via the display both-side selection circuit 10. Upon receiving the display request, the screen display processing device 11 calculates the area of the circle corresponding to the current speed deviation ΔN by the following equation.

The calculation of the equation (6) is performed in step S3. In step S4, check the radius r _A of a circle corresponding to the alarm limit value N _A. In step S5, the circle coordinates (Q ₀ , H ₀ ) in equation (6) are displayed in white and the circle with radius r _A corresponding to the alarm limit value N _A is shown in red as shown in Fig. 5. Display on CRT4.

Next, in step S1, the speed deviation ΔN is the alarm limit value Δ
If it is judged that it is larger than N _A , the process proceeds to step S6, and the speed deviation ΔN and the deviation life limit value ΔN _C are compared. When the speed deviation ΔN is small, the process proceeds to step S7 and the display area A is obtained based on the equation (6). Then, the process moves to step S8 and the life limit value
To verify the radius r _C of the area of the N _C. At step S9, the circle of the size obtained at step S7 is blinked in red on CRT4 as shown in FIG. 6, and the circle corresponding to the life limit value N _C is displayed in blue. On the other hand, if the speed deviation ΔN is larger than the deviation life limit value ΔN _C in step S6, the life limit value N in step S10.
_Let A _C, which is equivalent to _C , be the display area A. And step S
At 11, CRT4 displays as shown in Fig. 7. In this case, the circle is displayed in blue.

In this way, the speed deviation ΔN is displayed.
Since it is displayed as the size of a circle in the dimensional coordinates, it can be accurately grasped.

In the above embodiment, the deviation life limit value and the deviation alarm limit value are also displayed in a circle at the same time, but this is desirable for monitoring the equipment and is not always necessary.

〔The invention's effect〕

As described above, according to the present invention, the state of the plant equipment can be accurately grasped by the two-dimensional display.

Although the above-mentioned embodiment is a case where the plant equipment is a pump, it is needless to say that it can be similarly applied to other plant equipment. Further, although the case where the plant equipment amount is the number of revolutions and increases with the aging has been described, the plant equipment amount that decreases with the aging can be similarly monitored.

Further, in the above embodiment, the plant device deviation amount is displayed in a circle, but it can be displayed in a rectangle.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a flow chart for explaining the operation of FIG. 1, and FIGS. 3 and 4 are characteristic diagrams for explaining the concept of the present invention. 5 to 7
The figure is a diagram showing a display example. 4 ... CRT, 7 ... Theoretical calculation circuit, 8 ... Speed deviation calculation circuit, 9 ... Limit value calculation circuit, 11 ... Screen display processing circuit.

Claims (2)

[Claims] 1. A plant equipment having three mutually related process equipment quantities, and the three process equipment quantities are respectively detected, and two of them are theoretical values of the remaining one process equipment quantity. And a deviation calculating means for calculating a process equipment quantity deviation by comparing the detected value of the one process equipment quantity with a theoretical value.
The above-mentioned two process equipment quantities are used as X-axis and Y-axis, respectively.
A two-dimensional display device, the two process equipment quantities and one process equipment quantity deviation are input, and the process equipment quantity deviation is calculated according to the area display size centered on the intersection of the two process equipment quantities. A plant equipment condition monitoring device comprising a display control means for displaying on a display device. 2. The display control means according to claim 1, wherein the display control means performs a circular display centering on an orthogonal position of two process equipment quantities as a plant equipment quantity deviation. 2. A plant equipment condition monitoring device according to claim 1.