JP5127359B2 - Alarm system - Google Patents

Description

The present invention relates to an alarm system. More particularly, the present invention provides a alarm system chemical plant having a plurality of operation modes, and a plurality of alarm issuance object detection end having a function of trigger an alarm, to trigger an alarm when changing operating modes The alarm command set value of multiple alarm command target detection terminals with functions can be changed instantaneously without delay, the burden associated with the correction of the alarm command set value when changing the operation mode can be reduced, and it is also related to the transition to emergency stop mode The present invention relates to an alarm system having an excellent effect that the reliability of issuing an important alarm can be improved.

  An alarm system by a chemical plant control system generally indicates the upper and lower limits of the appropriate operating range of the target detection end and the normal on / off state, for example, a thermometer, a pressure gauge, a flow meter, an analyzer, an opening valve of an operation valve. It is set for each vibration meter of a rotating machine, further an ammeter of an electric motor, etc., and when it is outside this condition, it is installed for the purpose of issuing an alarm and prompting the operator to take measures. The set values of these warnings are not only set so that the plant operates safely and stably for each operating load, but also the set values are corrected so that the operation is economical. Furthermore, the monitoring reinforcement points and the necessity of setting are particularly different during non-steady operations such as plant start operation, stop operation, and load adjustment, and the setting needs to be changed each time. For this reason, changing the set value of the announcement is a heavy burden on the operator, and the change of the set value of the announcement is delayed, an unnecessary alarm is issued due to a setting error, or the necessary alarm is not issued. Problems may occur, and as a result, the operator may be prevented from taking appropriate measures.

Furthermore, in a chemical plant, when a serious problem occurs in each of the planned operation modes, such as start operation, stop operation, load adjustment, and steady operation, the equipment is automatically or semi-automatically shut down to ensure safety. May have an emergency stop mode to stop.
These are called interlocks, but in such an emergency stop mode, it is necessary to eliminate even more unnecessary warnings and to let the operator know where to take urgent action. Particularly important alarm warning values related to, for example, the interlock operation must be avoided as much as possible from inconvenience due to input mistakes during operation and selection mistakes in operation mode.

  For example, Patent Document 1 discloses a technique for facilitating registration of different alarm management values for each operation stage of a large number of tags. Among them, there is a description of “alarm suppression function” for setting and changing a plurality of alarm management values for a plurality of operation modes in a lump, but there is no detailed explanation about the alarm suppression function in the prior document. In addition, there is no description for preventing an input error or an operation mode selection error with respect to an important alarm set value related to the above-described determination of transition to the emergency stop mode.

  Patent Document 2 discloses a technique for detecting an operating state, reading out a warning discrimination value corresponding to a change in a driving state registered in advance, and optimizing the warning discrimination value.

  However, in this method, a procedure called an operation mode determination routine is specifically shown as a method for detecting an operation state. However, when tag data is used for operation mode determination of a structure tag, the tag value may be erroneous. If the instructions are not correct, there is a possibility that all the alarm warning values of the related group will not be set correctly. Furthermore, there is no description for preventing an input error or an operation mode selection error with respect to an important alarm setting value related to the judgment of transition to the emergency stop mode in the prior literature, and further improvement has been desired. .

JP-A-9-198128 JP-A-5-12586

In such circumstances, an object of the present invention is to provide, a alarm system chemical plant having a plurality of operation modes, and a plurality of alarm issuance object detection end having a function of trigger an alarm, the operation mode changes The alarm command set value of multiple alarm command target detection terminals that have a function to issue an alarm at the time can be changed instantaneously without delay, the burden associated with changing the alarm command set value when changing the operation mode can be reduced, and emergency stop An object of the present invention is to provide an alarm system having an excellent effect that the reliability of issuing an important alarm related to the transition to the mode can be improved.

That is, the present invention provides a alarm system chemical plant having a plurality of operation modes, and a plurality of alarm issuance object detection end having a function of trigger an alarm, relates to a warning system having the following features is there.
(A): the alarm issuance object detection end is divided is connected to the emergency stop system, a Group 1 used in the necessity determination of the emergency stop of the chemical plant, into a group 2 for use in a process control system it (B): alarm issued subject detection end belonging to the group 1, it has independently a means that does not trigger an alarm when the condition is met the alarm issued for each alarm issued subject detection end belonging to the group 1 (C): group the alarm issued subject detection end belonging to 2, with a set of alarms issued values corresponding to a plurality of respective operation modes are stored, corresponding to the operation mode, the selection of a set of alarm issuance value operator manually that it comprises means capable of performing (D): the alarm issuance target detection end belonging to the group 1, the alarm issuance target detection end belonging to the group 2, is installed in the same position of the chemical plant, One even if you detect the same alert issued subject is shared without any Rukoto by Rukoto prepared separately, that are constructed independent

The present invention provides a alarm system chemical plant having a plurality of operation modes, and a plurality of alarm issuance object detection end having a function of trigger an alarm, a plurality having a function of trigger an alarm at the time of changing operating modes The alarm command set value at the alarm command target detection end can be changed instantly and without delay, the burden associated with changing the alarm command set value when changing the operation mode can be reduced, and important alarms related to the transition to emergency stop mode The alarm system which has the outstanding effect that the reliability of issuing can be improved can be provided.

The present invention is an alarm system chemical plant having a plurality of operation modes, and a plurality of alarm issuance object detection end having a function of trigger an alarm.

  The plurality of operation modes may be determined assuming an operation mode considered necessary by the practitioner. For example, the planned operation mode is start operation, stop operation, load adjustment, steady operation, and emergency stop mode. The mode corresponding to the magnitude of the load, the type of product standard, etc. can also be used for steady operation.

  The alarm detection target detection end is a detection end of a process having a function of issuing an alarm to notify the operator when a specific situation set in advance is reached. Specific examples include a thermometer, a pressure Examples include a meter, a flow meter, an analyzer, an opening meter for an operation valve, a vibration meter for a rotating machine, and an ammeter for an electric motor. In the case of reactors and storage tanks, specific conditions include temperature, pressure, liquid level, and upper and lower control values for the flow rate of the feed liquid. The lower limit can be increased. In the case of a rotating machine, the upper and lower limits of management such as the allowable limit value of vibration, the number of revolutions, and the current value can be increased. In the case of measurement, the upper and lower limits of management of the analyzer are also included.

  Usually, a buzzer, a bell, a lamp, or the like is used as means for transmitting an alarm to the operator.

  Although there is no restriction | limiting in particular as a chemical plant, It can illustrate the chemical product manufacturing equipment etc. which have a computer control function, and is suitable when it has an emergency stop system.

Alarm system of the present invention, an alarm issuance object detection end, is connected to at least an emergency shutdown system, a Group 1 used in the necessity determination of the emergency stop of the chemical plant, into a group 2 for use in a process control system It is what is divided. The necessity determination of emergency stop here is determining whether it is necessary to urgently stop the target process and equipment from the viewpoint of safety of the chemical plant and equipment protection. For this reason, the alarm issue value at the alarm issue target detection end belonging to Group 1 is set according to the judgment criteria determined from the safety and stability of the material handled, the design conditions of the equipment, and the like. The emergency stop may be operated by the operator judging based on an alarm, but the alarm issuing target detection end is directly connected to an automatic stop system to trigger a stop operation. On the other hand, from the viewpoint of economy and controllability in each operation mode, the alarm issue value of the alarm issue target detection end belonging to Group 2 is sometimes used from the viewpoint of a pre-alarm issued before the emergency stop necessity determination. It is often set as the upper or lower limit of the allowable operating range.

In the alarm system of the present invention, the alarm issuance subject detection end belonging to the group 1 are those having independently means that does not trigger an alarm when the condition is met in the alarm issued for each alarm issued subject detection end. The alarm issued subject detection end belonging to the group 1 as described above, since a warning issued subject detection end which issued important alarms related to necessity determination of the emergency stop, alarm issuance value collectively the operator by the operation mode It is desirable to manage the set value independently from the alarm issue target detection end belonging to the group 2 to be changed from the viewpoint of preventing a setting error due to an erroneous operation or a management error. Furthermore, the alarm issuance subject detection end belonging to the group 1, the means does not trigger an alarm when the condition is met the alarm issuance, be located on / off switch of the alarm functions e.g. by hardware or software, in view of improving reliability Desirable from. Furthermore, reliability may be improved by providing a protection function that requires a physical key insertion or an unlock number when changing the switch position. It is effective to install such means for improving the reliability for each detection end of the alarm issue target detection end belonging to group 1.

In the alarm system of the present invention, the alarm issuance subject detection end belonging to the group 2, together with the set of alarm issued values corresponding to a plurality of respective operation modes are stored, corresponding to the operation mode, manual operator A means for selecting a set of alarm issuing values is provided. The multiple operation modes include planned operation modes such as start operation, stop operation, load adjustment, steady operation, and emergency stop mode. It is preferable to prepare a set of alarm issuing values in a mode corresponding to. That is, a set of alarm command values belonging to group 2 is required for the number of prepared operation modes, but among alarm command values to be classified into group 2, it is necessary to change the value depending on the operation mode. Even if the alarm warning values are further separated into separate groups and excluded from the warning warning value set, a set of warning warning values that summarizes multiple warning warning values that need to be changed depending on the operation mode If prepared, the effects of the present invention can be obtained. The set of alarm warning values is a plurality of alarm warning target detection ends of the chemical plant, specifically, thermometers, pressure gauges, flow meters, analyzers, operating valve opening meters, rotating machine vibration meters, and It is preferable that the detection end of the motor ammeter or the like is managed by a number called a tag, and a predetermined numerical value for issuing an alarm is set in each tag. The set value of each tag set in this way may be a group of the entire chemical plant, or may be divided into sections that are convenient for management, and may be set as one set. The parts that can be shared may be shared to reduce the number of alarm warning value sets. Individual alarm warning values registered in the alarm warning value set corresponding to each operation mode can be corrected and re-registered for each individual tag regardless of whether the chemical plant is operating or stopped. Preferably it can be done. The method of correction / re-registration is not particularly limited, but normally, when the alarm warning value of the tag of the currently called operation mode is updated, it is overwritten with the alarm warning value of another operation mode. It is preferable to design so that the saved file of the original operation mode is automatically updated. Another method is to load an electronic file that contains a set of alarm values for the operation mode whose settings you want to change into a terminal such as a computer for changing settings, and change the value registered in the target tag. After that, you can save the file and overwrite the original set of warning values. Further, the alarm issue target detection end in the alarm system of the present invention corresponds to the operation mode, and has means that allows the operator to manually select a set of alarm issue values. Specifically, from the set of alarm warning values prepared for each operation mode, the alarm warning value recorded in the alarm warning value set of the operation mode selected by the operator is instantly called, and the alarm system The method can be implemented by overwriting the alarm issue value of the corresponding tag with the alarm issue value of the selected set. As a method for the operator to select the operation mode, it is desirable that a call button for each operation mode is installed by hardware or software so that the operator can easily select the operation mode when changing the operation mode. By doing in this way, when a plurality of alarm issuing target detection ends belonging to group 2 deviate from an appropriate operation range corresponding to each operation mode, an alarm is issued to prompt the operator to respond, and finer optimization is required. Even a chemical plant can be operated under optimal conditions.

The alarm system of the present invention is preferably a system in which the control system in the emergency stop mode is independent of the control systems in other operation modes among the operation modes. By doing so, there is an advantage that the control system in the emergency stop mode is completely independent from the control system in the normal operation, and the reliability of the emergency cutoff mode is further increased. Specifically, for example, the emergency stop system by a generally known hard relay system or a system called SIS and DCS which is a plant process control system can be installed independently. The detection end to be used in the detection end and the process control which is connected to an emergency shutdown system is installed in the same location, and without Rukoto shared even if you detect the same alert issued subject set aside Rukoto Is preferable from the viewpoint of reliability of safety measures. More specifically, for example, in the case of a reactor thermometer, a thermometer used for temperature control is TC-100, and a thermometer used for an emergency stop trigger is TA-101. Thus, the process control system and the emergency stop system are made independent. However, even in this case, the instruction value of TA-101, which is an emergency stop trigger, may be captured and monitored in the DCS as temperature information that does not interfere with the control system.

  In realizing the system of the present invention, a normal design method may be applied with the above-described features of the present invention in mind.

  Next, the concept of the present invention will be described with reference to examples.

Example 1
An alarm system of chemical plant A having a plurality of alarm issue target detection ends is constructed in the following procedure.
Step 1: Group setting of alarm notification target detection end Alarm notification target detection end is classified into group 1 and group # 100: reaction process group 1
TA-101: Reactor temperature PA-101: Reactor pressure Group 2
TC-100: Reactor temperature PC-100: Reactor pressure FC-100: Reactor FEED flow rate LC-100: Reactor liquid level # 200: Purification process Group 1
TA-201: Purification tower BTM temperature PA-201: Purification tower TOP pressure Group 2
TC-200: Purification tower BTM temperature PC-200: Purification tower TOP pressure FC-200: Purification tower reflux amount LC-200: Purification tower BTM liquid level LC-201: Purification tower reflux drum liquid level

Procedure 2: Setting of alarm command target detection end belonging to group 1 Set the emergency stop necessity determination setting value of the alarm command target detection end belonging to group 1, and assign an alarm on / off switch for each tag.
TA-101 HH = ° C
PA-101 HH = kPaG
TA-201 HH = ° C
PA-201 HH = kPaG

Procedure 3: Setting of alarm notification target detection end belonging to group 2 Perform operation mode division for batch change of alarm output values corresponding to the operation mode of alarm notification target detection end belonging to group 2, and each tag in each operation mode Set the lower limit and upper limit of each alarm issue value and register them as a set for each mode. In addition, each set is assigned by installing a button that can call each mode at once.

Mode 1: Start / Stop TC-100: L = ° C H = ° C
PC-100: L = kPaG H = kPaG
FC-100: L = kg / H H = kg / H
LC-100: L =% H =%
TC-200: L = ° C. H = ° C.
PC-200: L = kPaG H = kPaG
FC-200: L = kg / H H = kg / H
LC-200: L =% H =%
LC-201: L =% H =%

Mode 2: Load adjustment TC-100: L = ° C H = ° C
PC-100: L = kPaG H = kPaG
FC-100: L = kg / H H = kg / H
LC-100: L =% H =%
TC-200: L = ° C. H = ° C.
PC-200: L = kPaG H = kPaG
FC-200: L = kg / H H = kg / H
LC-200: L =% H =%
LC-201: L =% H =%

Mode 3: Steady operation (load 50% to 75%)
TC-100: L = ° C. H = ° C.
PC-100: L = kPaG H = kPaG
FC-100: L = kg / H H = kg / H
LC-100: L =% H =%
TC-200: L = ° C. H = ° C.
PC-200: L = kPaG H = kPaG
FC-200: L = kg / H H = kg / H
LC-200: L =% H =%
LC-201: L =% H =%

Mode 4: Steady operation (load 75% to 100%)
TC-100: L = ° C. H = ° C.
PC-100: L = kPaG H = kPaG
FC-100: L = kg / H H = kg / H
LC-100: L =% H =%
TC-200: L = ° C. H = ° C.
PC-200: L = kPaG H = kPaG
FC-200: L = kg / H H = kg / H
LC-200: L =% H =%
LC-201: L =% H =%

Mode 5: Emergency stop mode TC-100: L = ° C. H = ° C.
PC-100: L = kPaG H = kPaG
FC-100: L = kg / H H = kg / H
LC-100: L =% H =%
TC-200: L = ° C. H = ° C.
PC-200: L = kPaG H = kPaG
FC-200: L = kg / H H = kg / H
LC-200: L =% H =%
LC-201: L =% H =%

Step 4: Fix alarm warning position of tag belonging to group 1 Turn on / off switch of alarm warning of tag belonging to group 1 and remove the key to lock.

Procedure 5: Setting alarm command set value corresponding to the operation mode of tags belonging to group 2 Select the operation mode button prepared in advance , and set the alarm command values of all tags belonging to group 2 to corresponding command set values. Set.

Claims (1)

A plurality of operation modes, an alarm system of a chemical plant and a plurality of alarm issuance object detection end having a function of trigger an alarm, the alarm system with the following features.
(A): the alarm issuance object detection end is divided is connected to the emergency stop system, a Group 1 used in the necessity determination of the emergency stop of the chemical plant, into a group 2 for use in a process control system it (B): alarm issued subject detection end belonging to the group 1, it has independently a means that does not trigger an alarm when the condition is met the alarm issued for each alarm issued subject detection end belonging to the group 1 (C): group the alarm issued subject detection end belonging to 2, with a set of alarms issued values corresponding to a plurality of respective operation modes are stored, corresponding to the operation mode, the selection of a set of alarm issuance value operator manually that it comprises means capable of performing (D): the alarm issuance target detection end belonging to the group 1, the alarm issuance target detection end belonging to the group 2, is installed in the same position of the chemical plant, One even if you detect the same alert issued subject is shared without any Rukoto by Rukoto prepared separately, that are constructed independent