Automatic protection method for factory working conditions

Abstract

The invention belongs to the technical field of factory automatic control, and particularly relates to an automatic protection method for factory working conditions. The method comprises the following steps: S1, determining a working condition of system operation, and carrying out quantitative judgment on the working condition; s2, setting working condition abnormity protection measures; and S3, carrying out automatic protection according to the working condition abnormity protection method determined in the S2. According to the method, the timeliness of working condition abnormity judgment is improved, the reliability of protection action execution is improved, the safety and stability of operation of a factory system are improved, manual operation is reduced, and the automatic protection function is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of factory automatic control, and in particular relates to an automatic protection method for factory working conditions. Background Art

[0002] The factory adopts a closed-loop production mode and is controlled by the main pipeline as a unit. The main pipeline contains main equipment, a large number of valves, instruments, etc. Daily operation and maintenance personnel mainly adjust the parameters of the pipeline pressure instrument by adjusting the status of the regulating valve and the stop valve to ensure the stability of the process pipeline pressure. To ensure the safety of the main equipment, when the pipeline parameters are out of control, a series of valve switches need to be performed and the equipment needs to be started and stopped in coordination. At present, this operation is mainly completed manually. Due to the limitations of manual experience and individual emergency responses, the results of this emergency operation are not very ideal, and the quality of the handling depends on the level of manual technology. Therefore, it is necessary to design an automatic protection method for working conditions to directly determine under what circumstances protective measures should be taken and how to take protective measures in a standard quantitative manner. Summary of the invention

[0003] The technical problem solved by the present invention is: to provide a method for automatic protection of factory operating conditions, which not only improves the timeliness of abnormal operating condition judgment, but also improves the reliability of executing protection actions. While improving the safe and stable operation of the factory system, it reduces manual operations and realizes the automatic protection function.

[0004] The technical solution adopted by the present invention is:

[0005] A method for automatic protection of factory working conditions, comprising the following steps:

[0006] S1. Determine the operating conditions of the system and make quantitative judgments on the operating conditions; S2. Set up protection measures for abnormal operating conditions; S3. Perform automatic protection according to the abnormal operating condition protection method determined in S2.

[0007] The system is quantitatively judged based on seven normal operating states. The system can only be in one operating state at the same time. If it exceeds the above range, it is judged as an abnormal operating condition and protective measures need to be taken.

[0008] The seven normal states include: state 1: the main pipeline is open and in normal working state; state 2: the main pipeline is connected to the normal state; state 3: the production area is open; state 4: the main line is taking material; state 5: the standby line is taking material; state 6: the evacuation state; state 7: the production area is closed.

[0009] According to the 7 normal working conditions, the protection measures include executing protection actions and only executing alarm reminders.

[0010] The risks that may be caused by the main equipment are classified according to the abnormal working conditions, and the states 1, 2, 3, and 7 are classified as only executing alarm reminders; and the states 4, 5, and 6 are classified as executing protection actions.

[0011] When the main process system is running, first determine that the current operating state is not in an abnormal situation other than 4, 5, and 6 operating conditions; then determine that if the current operating state is in an abnormal situation other than 1, 2, 3, and 7 operating conditions, the alarm reminder function is executed.

[0012] When the main process system is running, first determine whether the current operating condition is abnormal outside of conditions 1, 2, 3, and 7, and then determine whether the current operating condition is abnormal outside of conditions 4, 5, and 6, and execute protection action functions.

[0013] In S3, the DCS distributed control system reads the basic parameters of the main process pipeline, determines the state according to the basic parameters of the main process pipeline, and performs tree branch judgment, wherein one branch judges abnormal working conditions in a full coverage manner; and the other branch judges abnormal working conditions that require protection actions.

[0014] The full coverage method is used to determine abnormal operating conditions, that is, the main pipeline and production area are used as the smallest units, and the equipment, valves, and instrument parameters are used as the smallest components to determine the operating condition status, forming a logic block diagram, taking the collected single main pipeline as a unit, and taking the closing status of all valves in the main pipeline and the production area as the status identifier. When the closing status is ON, it means that the valve is fully closed, otherwise it is fully open. The logic AND is used as the smallest association module, and the front end is connected to the current valve status of the production area.

[0015] The abnormal working conditions requiring protection actions are judged.

[0016] Determine the status of the production area, including the material taking status and the vacuuming status;

[0017] Determine the main pipeline valve status and connect it to the above production status area determination in a logical AND manner;

[0018] When the conditions for executing automatic protection measures are met, a command to execute protection is sent to the system in the form of a constant-hold signal;

[0019] Signals or associations are sent in the form of 5-second pulses before the main pipeline valves and production area valves that require automatic protection. This allows the automatic protection program to be executed in a bypass manner without interfering with the normal protection actions of the system, and the valves and equipment to perform related operations.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The present invention provides a method for automatic protection of factory working conditions, which ultimately realizes automatic protection of working conditions by combining a quantitative judgment method with an automatic control method.

[0022] (2) The present invention provides a method for automatic protection of factory operating conditions, which not only improves the timeliness of abnormal operating condition determination, but also improves the reliability of executing protection actions.

[0023] (3) The present invention provides an automatic protection method for factory operating conditions, which improves the safe and stable operation of the factory system while reducing manual operations and realizing automatic protection functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The same reference numerals are used in these drawings to represent the same or similar parts. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0025] Figure 1 A logic block diagram of a method for automatic protection of factory working conditions provided by the present invention;

[0026] Figure 2 This is the logic block diagram for judging abnormal material extraction. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The present invention provides a method for automatic protection of factory working conditions, comprising the following steps:

[0031] S1. Determine the operating conditions of the system and make quantitative judgments on the operating conditions

[0032] like Figure 1 As shown, quantitative judgment is made based on several normal states of system operation, including:

[0033] State 1: The main pipeline is open and in normal working state. This state is the normal operation mode of the entire factory, with complete material inlet and outlet and parameter control functions. Its valve state: valves 1-4 of the main pipeline are fully open, and valves 5-7 are fully closed;

[0034] State 2: The main pipeline bypass is in normal state. In this state, when abnormal conditions such as equipment failure and process material leakage occur in the main pipeline area, the main pipeline is separated from the main production unit for maintenance, and the maintenance does not affect the normal operation of other main production units. Its valve state: valves 1-4 of the main pipeline are fully closed, and valves 5-7 are fully open;

[0035] State 3: Production area open state. This state is the minimum production unit open mode, used to connect the main pipeline to open the pipeline for production. Its valve state: valves 1-3 in the production area are in full open state, and valves 4-7 are in full closed state;

[0036] State 4: Main line material collection state. This state is the main line in the main and standby dual redundant material collection pipelines collecting product materials. If this mode is running, it means collecting product materials through the main line. Its valve state: valves 1-3 in the production area are fully closed, and valves 4-5 are fully open;

[0037] State 5: Standby line material taking state. This state is the same as the main line material taking state, except that the standby pipeline in the dual redundant pipeline is used. Its valve state: valves 1-3 in the production area are fully closed, and valves 4-5 are fully open;

[0038] State 6: Vacuum state. In this state, in abnormal or maintenance situations, the relevant pipeline units are bypassed and the pipeline is vacuumed. The valve states are: valves 1-3 in the production area are fully closed, and valves 4-7 are fully open;

[0039] State 7: Production area closed state. This state is the protection state of the entire large production area. When the abnormal situation is complex and the parameter control is difficult, it will enter the protection mode. Its valve state: valves 1-7 in the production area are in a fully closed state.

[0040] The above states are within the normal operating range of the main process system. The system can only be in one operating state at the same time. If it exceeds the above range, it is judged as an abnormal operating condition and protective measures need to be taken.

[0041] S2. Set up protection measures for abnormal working conditions

[0042] The 7 normal operating conditions include the main process system being in a normal production state and a relatively normal state in the accident protection stage. Therefore, the protection measures required for situations beyond the above quantitative determination conditions are different.

[0043] Specifically, the protection measures first classify the protection types, and divide the seven states into a class requiring execution of protection actions and a class only executing alarm reminders.

[0044] Furthermore, the risks that may be caused by the abnormal working conditions to the main equipment are classified, and the states 1, 2, 3, and 7 are classified as only executing alarm reminders; and the states 4, 5, and 6 are classified as executing protection actions.

[0045] Specifically, the abnormal working conditions that only alarm reminders are executed: when the main process system is running, first determine that the current working condition is not in an abnormal situation other than working conditions 4, 5, and 6. Further, if the current working condition is determined to be in an abnormal situation other than working conditions 1, 2, 3, and 7, the alarm reminder function is executed. The alarm reminder function is to remind the operator in the form of color, sound, and text alarms on the monitoring interface that the current working condition is abnormal, and the corresponding inspection and confirmation should be carried out.

[0046] Specifically, the abnormal working condition of executing the protection action type: when the main process system is running, first determine that the current working condition state is not in an abnormal situation other than working conditions 1, 2, 3, and 7. Further, if it is determined that the current working condition is in an abnormal situation other than working conditions 4, 5, and 6, the protection action type function is executed.

[0047] Specifically, the protection action class includes the following steps: first, open valves No. 5-7 of the main pipeline, and when it is detected that the valves are already opened, immediately close valves No. 1-4 of the main pipeline, and simultaneously close valves No. 1-7 of the production area.

[0048] S3: Automatically protect according to the abnormal working condition protection measures determined in S2

[0049] Design automatic protection functions to realize automatic detection, judgment and execution of protection measures for abnormal working conditions. Use the DCS distributed control system to read the basic parameters of the main process pipeline, mainly including valve status, equipment status, and instrument parameters, and connect the field equipment in a hard-wired manner. Lay cables to connect the field equipment and the DCS distributed control system control command output channel. In this way, establish the acquisition and signal transmission channel.

[0050] In order to solve the automatic protection mode of two types of abnormal working conditions, the automatic program performs tree-like branch judgment, one of which judges the abnormal working conditions in a full coverage manner; the other branch judges the abnormal working conditions that require the execution of protection actions.

[0051] The full coverage method is used to determine abnormal working conditions, that is, the main pipeline and production area are used as the smallest unit, and the equipment, valves, and instrument parameters are used as the smallest components to determine the working condition status, forming the following Figure 1 The logic block diagram is shown. Taking the collected single main pipeline as a unit, the closed state of all valves in the main pipeline and the production area is taken as the state identifier. When the closed state is ON, it means that the valve is fully closed, otherwise it is fully open. With logic and as the minimum association module, the front end is connected to the current valve state of the production area.

[0052] In an enumerated manner, firstly, the normal working conditions of states 1-7 are enumerated. The current working condition valve position state is set according to the quantitative judgment. In particular, the elements of each normal working condition are combined in a logical AND manner to ensure that all the elements are currently in the normal position before it can be determined to be in the current normal working condition. The logic block diagram only illustrates the judgment state of state 3. In actual use, the 7 states of the quantitative standard need to be enumerated.

[0053] Furthermore, when listing the 7 types of normal operating conditions, the 7 types of operating conditions are associated in a logical OR manner. Through the logical OR, each originally independent type of normal operating condition is expanded, and when the automatic program judgment is executed, the 7 types of normal operating conditions are judged as a whole.

[0054] Furthermore, after the 7 types of working conditions are logically ORed and connected as a whole, the judgment is reversed. The purpose of performing this operation is to directly reverse the scope of the above 7 types of working conditions. As long as it is not included in these 7 types of working conditions, it is determined that the current working condition is abnormal.

[0055] The second branch of the tree branch is used to perform abnormal working conditions of protection actions for determination. Specifically, it is listed as vacuuming, material extraction, and valve error. The program is identified based on the status of valve No. 4 and valve No. 7 in the production area. When the opening state of valve No. 4 is ON, it is determined to be in the material extraction state; when the opening state of valve No. 7 is ON, it is determined to be in the vacuum state.

[0056] Furthermore, if Figure 2 The abnormal material picking judgment is shown.

[0057] The states of valves No. 4 and No. 7 in the production area are connected in parallel in a logical OR manner, and at the same time, they are connected in series with valves No. 1-3 in the production area in a logical AND manner. That is, the premise for judging the abnormal operating condition must first be that an abnormality occurs in the valves in the production area when the production area is being evacuated or taking materials.

[0058] Furthermore, the execution of the second branch judgment needs to be combined with the current main pipeline valve status. Therefore, the main pipeline valve closed status is taken as ON for judgment and connected to the above production area judgment in a logical AND manner.

[0059] Furthermore, the above-mentioned second branch judgment completes the enumeration of normal operating conditions under the vacuum and material extraction states, and is inverted after the AND logic of the main pipeline valve status judgment and the production area valve status judgment, thereby indicating that all conditions except the currently listed conditions are abnormal conditions.

[0060] Specifically, the automatic execution of protection measures algorithm mainly involves the identification of specific abnormal working conditions and the execution of automatic protection action instructions. The logic association is made with vacuuming, material extraction, and valve error. The open state of valve No. 4 is ON to represent material extraction; the open state of valve No. 7 is ON to represent vacuuming. The valve error identification is performed when the main pipeline valve is closed and the production area valve is closed.

[0061] Furthermore, the open state of valve No. 4 and the open state of valve No. 7 are logically or associated, which means that the conditions are met regardless of the vacuum or material extraction state.

[0062] Furthermore, the valve closing states of 1-3 in the production area are logically associated with ON, which means that the valves in the production area can only be in normal working condition when all 1-3 valves are in the closing state.

[0063] Furthermore, the valve closing states of the main pipeline 1-4 are logically associated with ON, which means that the main pipeline valves can only be in a normal working condition when all 1-4 valves are in the closing state.

[0064] Furthermore, after logically associating the above-mentioned valves No. 4 and No. 7, the production area valve, and the main pipeline valve, they are inverted again to indicate that except for the above-mentioned states, all other states are abnormal states.

[0065] Furthermore, the three modules after the above inversion are logically AND-associated, thereby indicating that the above inversion states must be satisfied at the same time before the automatic protection measures can be executed.

[0066] The automatic protection measures: when the conditions are met and the automatic protection measures are executed, a command to execute protection is sent to the system in the form of a constant-hold signal.

[0067] Furthermore, a signal or association is made in the form of a 5-second pulse before the main pipeline valve and production area valve that need to perform automatic protection. In this way, the automatic protection program is executed in a bypass manner without interfering with the normal protection action of the system, and the valves and equipment are controlled to perform related operations.

[0068] Furthermore, when executing the automatic protection program, the fully closed or fully open state of the valve in the previous process is identified as ON. Only when the state jump is detected can the next operation be executed.

[0069] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0070] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for automatic protection of factory working conditions, characterized in that: The steps include: S1. Determine the operating conditions of the system and make quantitative judgments on the operating conditions; S2. Set up protection measures for abnormal operating conditions; S3. Perform automatic protection according to the abnormal operating condition protection method determined in S2.

2. The method for automatic protection of factory working conditions according to claim 1, characterized in that: The system is quantitatively judged based on seven normal operating states. The system can only be in one operating state at the same time. If it exceeds the above range, it is judged as an abnormal operating condition and protective measures need to be taken.

3. The method for automatic protection of factory working conditions according to claim 2, characterized in that: The seven normal states include: state 1: the main pipeline is open and in normal working state; state 2: the main pipeline is connected to the normal state; state 3: the production area is open; state 4: the main line is taking material; state 5: the standby line is taking material; state 6: the evacuation state; state 7: the production area is closed.

4. The method for automatic protection of factory working conditions according to claim 3, characterized in that: According to the 7 normal working conditions, the protection measures include executing protection actions and only executing alarm reminders.

5. The method for automatic protection of factory working conditions according to claim 4, characterized in that: The risks that may be caused by the main equipment are classified according to the abnormal working conditions, and the states 1, 2, 3, and 7 are classified as only executing alarm reminders; and the states 4, 5, and 6 are classified as executing protection actions.

6. The method for automatic protection of factory working conditions according to claim 5, characterized in that: When the main process system is running, first determine that the current operating state is not in an abnormal situation other than 4, 5, and 6 operating conditions; then determine that if the current operating state is in an abnormal situation other than 1, 2, 3, and 7 operating conditions, the alarm reminder function is executed.

7. The method for automatic protection of factory working conditions according to claim 5, characterized in that: When the main process system is running, first determine whether the current operating condition is abnormal outside of conditions 1, 2, 3, and 7, and then determine whether the current operating condition is abnormal outside of conditions 4, 5, and 6, and execute protection action functions.

8. The method for automatic protection of factory working conditions according to claim 5, characterized in that: In S3, the DCS distributed control system reads the basic parameters of the main process pipeline, determines the state according to the basic parameters of the main process pipeline, and performs tree branch judgment, wherein one branch judges abnormal working conditions in a full coverage manner; and the other branch judges abnormal working conditions that require protection actions.

9. The method for automatic protection of factory working conditions according to claim 8, characterized in that: The full coverage method is used to determine abnormal operating conditions, that is, the main pipeline and production area are used as the smallest units, and the equipment, valves, and instrument parameters are used as the smallest components to determine the operating condition status, forming a logic block diagram, taking the collected single main pipeline as a unit, and taking the closing status of all valves in the main pipeline and the production area as the status identifier. When the closing status is ON, it means that the valve is fully closed, otherwise it is fully open. The logic AND is used as the smallest association module, and the front end is connected to the current valve status of the production area.

10. The method for automatic protection of factory working conditions according to claim 8, characterized in that: The abnormal working conditions requiring protection actions are judged. Determine the status of the production area, including the material taking status and the vacuuming status; Determine the main pipeline valve status and connect it to the above production status area determination in a logical AND manner; When the conditions for executing automatic protection measures are met, a command to execute protection is sent to the system in the form of a constant-hold signal; Signals or associations are sent in the form of 5-second pulses before the main pipeline valves and production area valves that require automatic protection. This allows the automatic protection program to be executed in a bypass manner without interfering with the normal protection actions of the system, and the valves and equipment to perform related operations.

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