Power plant water system intelligent linkage control method and system based on fault early warning

Abstract

The application discloses a power plant water system intelligent linkage control method and system based on fault early warning, comprising the following steps: 1) when there is a fault device, early warning information is sent out; 2) the fault device is kept in current operation, reduced power operation or switched device operation; 3) whether the internal fault of the system where the fault device is located is self-healing is judged, when the internal fault of the system where the fault device is located cannot be self-healing, linkage instructions are sent out to the upstream and downstream systems associated with the system where the fault device is located, and autonomous control measures are taken on the fault device, and a suitable device operation mode is selected; 4) after the autonomous control of the fault device is finished, whether the fault is eliminated is judged, when the fault is eliminated, the original operation mode of the fault device is restored, and the linkage instructions are cancelled; otherwise, whether the fault device has a standby device is judged, and the method and the system can avoid that the subsystem device is abnormally operated to cause damage of the device and even cause abnormal shutdown of the unit.

Description

Technical Field

[0001] This invention belongs to the field of intelligent linkage control technology, and relates to an intelligent linkage control method and system for power plant water systems based on fault early warning. Background Technology

[0002] Water is the lifeblood of thermal power plants, and the water system's pipeline network permeates every system within the plant. With increasing water scarcity and stringent environmental policies, and given the high water consumption of power plants, optimizing water resource allocation and improving utilization efficiency can save power generation costs. Furthermore, for condensate and feedwater systems, it can reduce the electricity or steam consumption of equipment operating within these systems. For condensate makeup water systems, it can reduce water and chemical consumption. Therefore, optimizing the operation of each water system can achieve energy-saving operation within each system, thereby improving the economic efficiency of the power plant.

[0003] Furthermore, under the automatic control power generation mode that coordinates various systems, although it is possible to achieve unattended regulation between systems during the load increase and decrease process of the unit, when equipment in each subsystem fails, the coordinated control system cannot effectively identify it, causing each subsystem to operate with defects, which may lead to damage to the equipment in each subsystem and thus abnormal shutdown of the unit. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method and system for intelligent linkage control of power plant water systems based on fault early warning. This method and system can prevent subsystem equipment from operating with faults, which could cause equipment damage or even abnormal unit shutdown.

[0005] To achieve the above objectives, the intelligent linkage control method for power plant water systems based on fault early warning, as described in this invention, includes:

[0006] 1) Determine if there are faulty devices in the makeup water treatment system, condensate system and water supply system. If faulty devices are found, issue an early warning message.

[0007] 2) Keep the faulty equipment running, reduce its power, or switch to another device.

[0008] 3) Determine whether the internal fault of the system where the faulty equipment is located can be self-healed. If the internal fault of the system where the faulty equipment is located cannot be self-healed, then send linkage instructions to the upstream and downstream systems associated with the system where the faulty equipment is located, and take autonomous control measures for the faulty equipment and select an appropriate equipment operation mode.

[0009] 4) After the faulty equipment finishes autonomous control, determine whether the fault has been eliminated. If the fault has been eliminated, restore the original operating mode of the faulty equipment and release the linkage command. Otherwise, determine whether there is a backup device for the faulty equipment. If there is no backup device, maintain the current operating mode of the faulty equipment and shut it down for processing when appropriate, while maintaining the linkage command. If there is a backup device, start the backup device and release the linkage command after the fault has been eliminated.

[0010] The specific process for determining whether there are faulty devices in the makeup water treatment system, condensate system, and water supply system is as follows:

[0011] The system collects the operating status and measurement parameters of the makeup water treatment system, condensate system, and water supply system, and determines whether there are faulty devices in these systems based on the collected data.

[0012] The appropriate equipment operation modes include stabilizing the current operating conditions, reducing equipment power, or switching to standby equipment.

[0013] The makeup water treatment system includes a pretreatment unit, a primary desalination unit, a secondary desalination unit, a demineralized water tank, and a demineralized water pump; the condensate system includes a condenser and a condensate pump; the feedwater system includes a deaerator, a feedwater pump, and a boiler. The outlet of the pretreatment unit is connected to the boiler in sequence via the primary desalination unit, the secondary desalination unit, the demineralized water tank, the demineralized water pump, the condenser, the condensate pump, the deaerator, and the feedwater pump.

[0014] The intelligent linkage control system for power plant water systems based on fault early warning, as described in this invention, includes:

[0015] The fault warning module is used to determine whether there are faulty devices in the makeup water treatment system, condensate system and water supply system. When a faulty device is found, a warning message is issued.

[0016] The system self-adjustment module is used to maintain the current operation of the faulty equipment, reduce its power, or switch the equipment's operation. It determines whether the fault within the system containing the faulty equipment can self-heal. If the fault cannot self-heal, it sends linkage commands to the upstream and downstream systems associated with the faulty equipment and takes autonomous control measures on the faulty equipment, selecting an appropriate operating mode. After the autonomous control of the faulty equipment ends, it determines whether the fault has been eliminated. If the fault has been eliminated, it restores the original operating mode of the faulty equipment and releases the linkage commands. Otherwise, it determines whether there is a backup device. If there is no backup device, it maintains the current operating mode of the faulty equipment and shuts it down for processing when appropriate, while maintaining the linkage commands. If a backup device exists, it starts the backup device, and releases the linkage commands after the fault is eliminated.

[0017] The specific process for determining whether there are faulty devices in the makeup water treatment system, condensate system, and water supply system is as follows:

[0018] The system collects the operating status and measurement parameters of the makeup water treatment system, condensate system, and water supply system, and determines whether there are faulty devices in these systems based on the collected data.

[0019] The appropriate equipment operation modes include stabilizing the current operating conditions, reducing equipment power, or switching to standby equipment.

[0020] The makeup water treatment system includes a pretreatment unit, a primary desalination unit, a secondary desalination unit, a demineralized water tank, and a demineralized water pump; the condensate system includes a condenser and a condensate pump; the feedwater system includes a deaerator, a feedwater pump, and a boiler. The outlet of the pretreatment unit is connected to the boiler in sequence via the primary desalination unit, the secondary desalination unit, the demineralized water tank, the demineralized water pump, the condenser, the condensate pump, the deaerator, and the feedwater pump.

[0021] The present invention has the following beneficial effects:

[0022] The intelligent linkage control method and system for power plant water systems based on fault early warning described in this invention adopts an upstream and downstream system linkage control approach during specific operation. It also combines self-healing, autonomous control measures, and switching to backup equipment to effectively prevent the expansion of system equipment failures caused by the distributed control system (DCS) failing to identify system equipment level faults under unified coordination control. This also eliminates unit outage accidents caused by water system equipment operating with defects and avoids subsystem equipment damage leading to operation with defects. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the power plant's water system;

[0024] Figure 2 This is a flowchart illustrating the fault warning and linkage mechanism of the present invention.

[0025] Figure 3 This is a flowchart of the present invention.

[0026] Among them, 1 is the makeup water treatment system, 2 is the condensate system, 3 is the feed water system, 11 is the pretreatment device, 12 is the primary desalination device, 13 is the secondary desalination device, 14 is the demineralized water tank, 15 is the demineralized water pump, 21 is the condenser, 22 is the condensate pump, 31 is the deaerator, 32 is the feed water pump, and 33 is the boiler. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion regarding the concepts disclosed in the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0028] The accompanying drawings show structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not drawn to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0029] refer to Figure 1 The power plant water system of the present invention includes a makeup water treatment system 1, a condensate system 2, and a feedwater system 3. The makeup water treatment system 1 includes a pretreatment device 11, a primary desalination device 12, a secondary desalination device 13, a demineralized water tank 14, and a demineralized water pump 15. The condensate system 2 includes a condenser 21 and a condensate pump 22. The feedwater system 3 includes a deaerator 31, a feedwater pump 32, and a boiler 33. The outlet of the pretreatment device 11 is connected to the boiler 33 in sequence via the primary desalination device 12, the secondary desalination device 13, the demineralized water tank 14, the demineralized water pump 15, the condenser 21, the condensate pump 22, the deaerator 31, and the feedwater pump 32.

[0030] refer to Figure 2 and Figure 3The intelligent linkage control method for power plant water systems based on fault early warning, as described in this invention, includes a fault early warning module, a system self-adjustment module, and a distributed control system.

[0031] The pretreatment unit 11, primary desalination unit 12, secondary desalination unit 13, and demineralized water pump 15 in the feedwater treatment system 1 are all composed of several sets arranged in parallel. After the raw water is treated by the pretreatment unit 11, primary desalination unit 12, and secondary desalination unit 13, the qualified demineralized water is transported to the demineralized water tank 14 for storage. The pretreatment unit 11, primary desalination unit 12, and secondary desalination unit 13 automatically start and stop according to the liquid level in the demineralized water tank 14 to ensure that the demineralized water tank 14 has sufficient demineralized water. During unit startup, the demineralized water in the demineralized water tank 14 is transported to the condenser 21 by the demineralized water pump 15 to mix with the condensate. The condensate output from the condenser 21 is transported to the deaerator 31 by the condensate pump 22. During unit operation, the boiler feedwater in the deaerator 31 is transported to the boiler 33 by the feedwater pump 32, thus completing the overall water system process.

[0032] The fault early warning module uses the operating status and measurement parameters of the makeup water treatment system 1, condensate system 2 and water supply system 3, and makes judgments through analysis technology, including but not limited to convolutional neural networks and random forests. When the actual operating parameters deviate from the preset values, corresponding early warning information is issued.

[0033] The self-adjustment module, in response to the warning information issued by the fault warning module, and in combination with the current operating status, enables the faulty equipment to maintain its current operation, reduce its power, or switch to other operating modes.

[0034] To determine whether an internal system fault can heal itself, if an internal system fault cannot heal itself, then it is necessary to use vertical linkage control to control the upstream and downstream systems associated with the faulty equipment.

[0035] When a fault occurs within a system, the system analyzes the status of the faulty equipment based on fault warning information and determines the appropriate operating mode based on internal mechanisms. This includes stabilizing the current operating conditions, reducing equipment power, or switching to standby equipment. During the adjustment process, linkage commands are sent to upstream and downstream systems to prevent the distributed control system (DCS) from sending control commands to these systems and affecting the overall unit operation. After the faulty equipment completes its self-adjustment, it is determined whether the warning fault has been eliminated. If the fault has been eliminated, the faulty equipment is restored to its original operating mode, and the linkage commands to upstream and downstream systems are released.

[0036] If the warning fault cannot be cleared after the faulty equipment self-adjusts, it is determined whether there is a backup device. If no backup device exists, the current operation of the faulty equipment is maintained, the linkage commands with upstream and downstream systems are maintained, and the faulty equipment is shut down for processing when appropriate. If a backup device exists, it is activated, and the linkage commands with upstream and downstream systems of the current faulty system are activated according to the operating status of the backup device. The warning fault is monitored to see if it has been cleared. If the fault is cleared, the current system is restored to normal operation, and the linkage commands with upstream and downstream systems are released.

[0037] Example 1

[0038] Taking condensate system 2 as an example, when a fault warning occurs for condensate pump 22, the system first adjusts its operating conditions based on the current unit operating status and specific information, selecting an appropriate operating mode. When a fault warning affecting the safe operation of condensate pump 22 occurs, increasing the frequency of condensate pump 22 is prohibited, and its operating frequency is reduced to prevent the fault from escalating. Simultaneously, linkage commands are sent to the upstream system (makeup water treatment system 1) and the downstream system (feed water system 3) of condensate system 2 to prevent unit imbalance accidents caused by the condensate pump 22 fault under the original control modes. During the self-adjustment process of the faulty condensate pump 22, if the warning fault is cleared, the original operating state of each system is restored; if the warning fault cannot be cleared, the standby condensate pump 22 is activated. After the standby condensate pump 22 is activated, the system's operating mode is adjusted according to the equipment operating parameters. In addition, the unit monitors and warns of system faults. When the original fault warning is eliminated, it releases linkage commands to the upstream and downstream systems, restores the original operating mode of each system, and the unit returns to a stable operating state.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for intelligent linkage control of a power plant water system based on fault early warning, characterized in that, include: 1) Determine whether there are faulty devices in the makeup water treatment system (1), condensate system (2) and water supply system (3). If there are faulty devices, issue an early warning message. 2) Keep the faulty equipment running, reduce its power, or switch to another device. 3) Determine whether the internal fault of the system where the faulty equipment is located can be self-healed. If the internal fault of the system where the faulty equipment is located cannot be self-healed, then send linkage instructions to the upstream and downstream systems associated with the system where the faulty equipment is located, and take autonomous control measures for the faulty equipment and select an appropriate equipment operation mode. 4) After the faulty equipment finishes autonomous control, determine whether the fault has been eliminated. If the fault has been eliminated, restore the original operating mode of the faulty equipment and release the linkage command. Otherwise, determine whether there is a backup device for the faulty equipment. If there is no backup device, maintain the current operating mode of the faulty equipment and shut it down for processing when appropriate, while maintaining the linkage command. If there is a backup device, start the backup device and release the linkage command after the fault has been eliminated.

2. The intelligent linkage control method for power plant water systems based on fault early warning as described in claim 1, characterized in that, The specific process for determining whether there are faulty devices in the makeup water treatment system (1), condensate system (2), and water supply system (3) is as follows: The operating status and measuring parameters of the makeup water treatment system (1), condensate system (2) and water supply system (3) are collected. Based on the collected operating status and measuring parameters of the makeup water treatment system (1), condensate system (2) and water supply system (3), it is determined whether there are faulty equipment in the makeup water treatment system (1), condensate system (2) and water supply system (3).

3. The intelligent linkage control method for power plant water systems based on fault early warning as described in claim 1, characterized in that, The appropriate equipment operation modes include stabilizing the current operating conditions, reducing equipment power, or switching to standby equipment.

4. The intelligent linkage control method for power plant water systems based on fault early warning as described in claim 1, characterized in that, The makeup water treatment system (1) includes a pretreatment device (11), a primary desalination device (12), a secondary desalination device (13), a desalinated water tank (14), and a desalinated water pump (15); the condensate system (2) includes a condenser (21) and a condensate pump (22); the feedwater system (3) includes a deaerator (31), a feedwater pump (32), and a boiler (33). The outlet of the pretreatment device (11) is connected to the boiler (33) in sequence through the primary desalination device (12), the secondary desalination device (13), the desalinated water tank (14), the desalinated water pump (15), the condenser (21), the condensate pump (22), the deaerator (31), and the feedwater pump (32).

5. A smart linkage control system for a power plant water system based on fault early warning, characterized in that, include: The fault warning module is used to determine whether there are faulty equipment in the makeup water treatment system (1), condensate system (2) and water supply system (3). When there are faulty equipment, a warning message is issued. The system self-adjustment module is used to maintain the current operation of the faulty equipment, reduce its power, or switch the equipment's operation. It determines whether the fault within the system containing the faulty equipment can self-heal. If the fault cannot self-heal, it sends linkage commands to the upstream and downstream systems associated with the faulty equipment and takes autonomous control measures on the faulty equipment, selecting an appropriate operating mode. After the autonomous control of the faulty equipment ends, it determines whether the fault has been eliminated. If the fault has been eliminated, it restores the original operating mode of the faulty equipment and releases the linkage commands. Otherwise, it determines whether there is a backup device. If there is no backup device, it maintains the current operating mode of the faulty equipment and shuts it down for processing when appropriate, while maintaining the linkage commands. If a backup device exists, it starts the backup device, and releases the linkage commands after the fault is eliminated.

6. The intelligent linkage control system for power plant water systems based on fault early warning as described in claim 5, characterized in that, The specific process for determining whether there are faulty devices in the makeup water treatment system (1), condensate system (2), and water supply system (3) is as follows: The operating status and measuring parameters of the makeup water treatment system (1), condensate system (2) and water supply system (3) are collected. Based on the collected operating status and measuring parameters of the makeup water treatment system (1), condensate system (2) and water supply system (3), it is determined whether there are faulty equipment in the makeup water treatment system (1), condensate system (2) and water supply system (3).

7. The intelligent linkage control system for power plant water systems based on fault early warning as described in claim 5, characterized in that, The appropriate equipment operation modes include stabilizing the current operating conditions, reducing equipment power, or switching to standby equipment.

8. The intelligent linkage control system for power plant water systems based on fault early warning as described in claim 5, characterized in that, The makeup water treatment system (1) includes a pretreatment device (11), a primary desalination device (12), a secondary desalination device (13), a desalinated water tank (14), and a desalinated water pump (15); the condensate system (2) includes a condenser (21) and a condensate pump (22); the feedwater system (3) includes a deaerator (31), a feedwater pump (32), and a boiler (33). The outlet of the pretreatment device (11) is connected to the boiler (33) in sequence through the primary desalination device (12), the secondary desalination device (13), the desalinated water tank (14), the desalinated water pump (15), the condenser (21), the condensate pump (22), the deaerator (31), and the feedwater pump (32).

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