JPH08126835A - Operation control of batch plant - Google Patents

Abstract

PURPOSE: To grasp at a glance that an individual and the whole process are operated as planned and to discover abnormality in an early stage by indicating as a whole the latest value and the track record of each main condition in a prescribed process on the same CRT screen. CONSTITUTION: In an indication position D on a CRT indication screen 15, the required time for whole process and that for each process are indicated in a bar graph by each plan and track record and comparing the plan with the track record. In indication positions E, F, the changes in internal temperature and liquid level of a reactor in each process up to the present time are indicated in a trend below corresponding to the schedule progress indication of the indication position D in a column. That is, in the indication position E, a standard value (a), an allowable upper limit value (b), an allowable lower limit value (c) and a track record change up to the present time (d) of the internal temperature of the reactor are indicated in a trend based on a measured value. In the indication position F, a standard value (a), an allowable upper limit value (b), an allowable lower limit value (c) and a track record change (d) of the liquid level of the reactor are indicated in a trend based on a measured value. For the two, the track record trend beyond the range between the allowable upper limit value (b) and the allowable lower limit value (c) is color-coded and understood at a glance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation management method for various chemical plants. More specifically, it is possible to recognize in real time the contrast between the latest measured value and the standard value of the main conditions in each step of the chemical reaction process. Regarding the above condition, the present invention relates to the operation management method of the batch plant in which the actual transition can be understood on one screen of the CRT in comparison with the standard transition.

[0002]

2. Description of the Related Art In the operation of a batch plant of a chemical reaction process, it is necessary to control the main conditions of each process so as to meet a preset plan in order to stably produce a product of constant quality. Therefore, the main conditions of each process are measured, and the operation management is performed while monitoring each measured value on the CRT screen. Conventionally, as a method of displaying the measured values of the main condition continuously measured in each process on the CRT screen, these measured values are aggregated and displayed in comparison with the control set value on the screen, or the actual result is displayed. The method of displaying changes in a trend is generally used, and the operation status is grasped and the operation management is performed by comparing a plurality of these display screens.

[0003]

When the situation is judged by comparing the measured value of the main condition measured for each process with the control set value, the control set value which is a guideline for operation management is necessary for the operation to proceed. In many cases, it is not a proper value in the transitional period of operation, so that a deviation easily occurs between the set value and the measured value. Even when the operation is stable, the set value and the measured value may not match due to problems such as control responsiveness.

Further, the measured value outside the control target is generally displayed in contrast only with the upper limit alarm limit value or the lower limit alarm value, and it is difficult to judge whether or not the tendency of the state is proper only with this display. As described above, the conventional display method on the CRT screen is not always sufficient for determining whether or not the operation is performed according to the preset plan in the screen monitoring. For this reason, in many cases, the main measurement values are recorded at the required points in each process, and it is confirmed whether or not they are operating as planned by comparing them with the standard values described in advance. Since the information (the latest value, actual result transition, etc.) in is distributed, it is necessary to expand the screen many times by the CRT operation, and there is a drawback that it takes time to grasp the situation.

In view of the above situation, the present invention can confirm the latest value against the standard value and at the same time confirm the past actual value against the standard value, thereby confirming whether or not the individual and entire processes are operated as planned. It is to provide an operation management method of a batch plant that can be grasped at a glance.

[0006]

Means for Solving the Problems As a result of intensive studies by the present inventors in order to achieve the above-mentioned object, the standard value of the main condition of a predetermined process, and an allowable upper limit that does not affect product quality, Set the lower limit for each product brand and in chronological order,
It was found that the operation management can be appropriately and easily performed by displaying each measured value, the standard value, and the upper and lower limit allowable values in contrast, and displaying the latest value and the past actual performance at the same time.

That is, according to the present invention, in a method of continuously measuring the main conditions of a predetermined process in a batch plant of a chemical reaction process and displaying the measured values on a CRT screen to grasp and manage the operating state of the plant, The same CR is used for the latest value display that simultaneously digitally displays the latest measured value of each of the main conditions in the form of comparison with the standard value, and the actual value display that displays the trend of the actual change of each measured value in the form of contrast with the standard transition.
Provided is a batch plant operation management method characterized by displaying all at once on a T screen.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. First, the target main condition measurement values are temperature, pressure, flow rate, liquid level, reaction time, analysis value (eg, component analysis value of process fluid), etc. in each process.
And the value obtained by performing a complex arithmetic process on these. Standard values are set for each process, product brand, and in chronological order. The set values include, for example, theoretical values and past representative data. The upper limit and lower limit must also be set for each process and brand and in time series.The upper and lower limit set values are, for example, theoretical limit values and standard deviation values of past representative data. There is a value that has been adjusted.

The measuring means is, for example, a reactor, a distillation column, a filter, or the like, and intermittently, that is, continuous or intermittent measurement is performed by each measuring device at each measuring point. The measured values are sequentially accumulated in the process computer in time series.

A CRT display screen for displaying a measured value, a standard value, an upper limit, a lower limit allowable value, a performance trend value, etc. is created for each device in each process. The display update interval is the latest value,
Although the management accuracy is improved if the actual trend trend value is as short as possible, it may be arbitrarily selected depending on the target device or measurement item. For example, an interval of several seconds to several minutes is possible. FIG.
Shows an example of a CRT display screen on which the present invention is applied to display a screen. Here, of the batch processing equipment of a chemical plant, for example, a reactor including a raw material charging step, a catalyst charging step, a reaction step, and an extraction step will be exemplified.

At the upper display position A of the CRT display screen 15, a device name (reactor name), a product name (brand), and an operation management batch number. Is displayed. At the display position B, the start and end times of the batch process in the reaction process are displayed for each plan and actual result, and the plan-actual difference time (delay) is displayed for each start and end. As the actual time when the operation is not completed, the scheduled end time obtained by adding the future planned time to the process time immediately before is displayed. This makes it possible to grasp the deviations from the actual operating time and the planned time of the reactor.

At the display position C, the required operating time of each process of raw material charging, catalyst charging, reaction, and extraction is displayed according to the plan and the actual result, and the time difference is displayed. The actual time in the process in operation or the process not yet started is replaced by the planned time. When a delay occurs from the plan, the process name can be color-coded so that it can be seen at a glance. As a result, the operating status of each process can be grasped.

At the display position D on the same screen, the entire process and the time required for each process are displayed as a bar graph in accordance with the plan and the actual result and in correspondence with each other. As a result, the process progress status of the entire process up to the current time and for each process can be determined at a glance.

At the display positions E and F, the internal temperature of the reactor in each process and the transition of the liquid surface up to the current time are displayed in the lower columns in correspondence with the process progress display at the display position D.
That is, the display position E is a trend display of the standard value a, the allowable upper limit value b, the allowable lower limit value c, and the actual result transition d up to the present time of the reactor internal temperature for each measured value, and the display position F is the reactor for each measured value. The liquid level standard value a, the allowable upper limit value b, the allowable lower limit value c, and the actual result transition d are displayed in a trend. In both cases, the actual trends that fall outside the permissible upper limit to the permissible lower limit are color coded so that they can be seen at a glance. As a result, it is possible to confirm at a glance whether or not the process is performed according to the preset plan, and it is possible to detect an abnormality early.

FIG. 2 is a diagram showing a flow chart of data processing in the operation management method of the present invention. The process data of the batch plant 1 is detected by the operation control system 2 (apparatus provided with the process data detecting means, the process adjusting means and the process controlling means), and the process data is collected by the data collecting / managing means 3 of the process computer 12. In addition, the operation control system 2 receives an event such as the start or end of a process, which is a turning point of operation, and operation data (product brand name, operation management batch No., process name, time) determined for each event. Etc.) and both are managed as actual data by the actual data management master 4.

The standard data creating means 5 creates necessary standard data by the operation database 6 and the process database 7 created by the data collecting / managing means 3, and stores them as the operation data standard master 8 and the process data standard master 9, respectively. Although the standard value is calculated based on the actual result of the standard data, the past actual result data is calculated and managed by various statistical processes. Further, among the standard data, data such as theoretical values which are not automatically updated by the internal arithmetic processing are input and managed by the standard data input means 10 of the process computer terminal.

The data collected in this manner is classified into the corresponding operation (actual data relating to the current operation or past operation) and standard data (standard value, upper limit allowable value, lower limit allowable value) according to the operator's request. In addition, both data are displayed on the same display screen of the display means 11 together with the comparison display of the actual result transition and the standard transition, as explained in FIG.

[0018]

As described above, according to the present invention, the measured values of the main condition measurement items of the predetermined process and their standard values, upper limit and lower limit allowable value are displayed in contrast for each product brand, and this display is also performed. And the same and the same CRT in the form of contrasting the current and past performance changes or the latest measured value changes with the standard changes
Since it is displayed on the screen, whether each individual process or the whole process is operating as planned, which part of which process is in trouble, what kind of trouble is it, etc. The determination and confirmation of can be performed at a glance even during operation, which enables quick and appropriate response, and has an effect of always performing appropriate operation management.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a CRT display screen when plant data is displayed on the screen by applying the present invention.

FIG. 2 is a data processing flow chart in the operation management system of the present invention.

[Explanation of symbols]

 1 Batch Plant 2 Operation Control System 3 Operation / Process Data Collection / Management Means 4 Actual Data Management Master 5 Standard Data Creation Means 6 Operation Database 7 Process Database 8 Operation Data Standard Master 9 Process Data Standard Master 10 Standard Data Input Means 11 Display Means 12 Process computer 15 CRT display screen

Claims (2)

[Claims] 1. A main condition of a predetermined process in a batch plant of a chemical reaction process is continuously measured and the measured value is CR.
In the method of grasping and managing the operating state of the plant by displaying on the T screen, the latest value display for simultaneously digitally displaying the latest measurement value of each of the main conditions in a form of being compared with the standard value,
An operation management method for a batch plant, characterized in that the actual transition of each measured value is trend-displayed in a form of being compared with the standard transition and the actual value display is collectively displayed on the same CRT screen. 2. The operation management method for a batch plant according to claim 1, wherein the latest value display is sequentially updated for each measured value at a fixed time.