Automatic Washing Method and System for Rotary Filter Screen in Seawater Direct-Flow Circulating Water System

Abstract

This invention discloses an automatic flushing method and system for a rotating filter screen in a seawater direct-flow circulating water system. The method includes summarizing the hydrological conditions of the circulating water system in a thermal power plant, considering the characteristics of the seawater environment; reviewing the experience of manually flushing rotating filters in the sea area where the power plant is located; designing the programmable start-stop logic for the rotating filter screen based on tidal difference start-up experience and manual experience; and designing the alarm trigger conditions for automatic flushing of the rotating filter screen. This invention significantly saves electricity; avoids inadequate human intervention, effectively extends the lifespan of the rotating filter screen, and thus improves the safety of the circulating water system. The programmable automatic flushing method for the seawater direct-flow rotating filter screen includes start-stop logic and related alarms and trip interlocks, improving the automation and intelligence level of the circulating water system, reducing the workload of operators and inspectors, and effectively increasing operational labor productivity.

Description

Technical Field

[0001] This invention relates to the field of circulating water systems in thermal power plants, and in particular to an automatic flushing method and system for rotating filters in seawater direct-flow circulating water systems. Background Technology

[0002] The area of ​​East China Sea with water quality at or below Class IV standards is significantly larger in autumn and winter than in spring and summer, especially in winter when the marine environment is particularly poor. Simultaneously, the astronomical high tides on the first and fifteenth days of the lunar calendar bring large amounts of marine life and debris to the nearshore area, impacting nearshore industrial and agricultural production. For thermal power plants, the astronomical high tides and the marine environment during winter have a significant impact on the circulating water system, especially the rotary filter, requiring close monitoring of its operation. The rotary filter in the circulating water system of a thermal power plant is located before the circulating water pump and is crucial for intercepting and treating marine debris and organisms, improving the cleanliness of the circulating water. During normal operation, pollutants are intercepted by the filter screen, lifted upwards by the conveyor belt, and then flushed into the trench and collected by the flushing water system.

[0003] Regular flushing of rotary filters is crucial for their safe operation. Currently, there are two methods for flushing rotary filters in thermal power plant circulating water systems: one is PLC-controlled flushing based on the water level difference before and after the filter, and the other is manual flushing via DCS. The first method has several drawbacks. First, the water level gauges before and after the filter have a high failure rate, making accurate measurements impossible. Second, the flushing time is unpredictable, and personnel cannot be on-site for timely inspection. Third, continuous flushing is not possible during periods of high tide or poor marine water quality. Therefore, PLC-controlled flushing based on water level difference cannot guarantee the effectiveness and safety of the rotary filter flushing. The second method, manual flushing, is prone to both under-flushing (insufficient flushing frequency and time leading to ineffective removal of filter debris) and over-flushing (excessive flushing time, resulting in wasted electricity and filter wear). Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the periodic rinsing of the above and / or existing rotary filters, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is how to provide an automatic flushing method for a rotating filter screen in a seawater direct-flow circulating water system based on human experience.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] In a first aspect, embodiments of the present invention provide an automatic flushing method for a rotating filter screen in a seawater direct-flow circulating water system, which includes summarizing the hydrological conditions of the operation of a thermal power plant circulating water system in combination with the characteristics of the seawater environment.

[0009] This study reviews the experience of manually rinsing rotary filters in the sea area where thermal power plants are located; designs the start-up and shutdown logic of rotary filters based on hydrological conditions, tidal difference start-up experience, and manual experience; and designs the alarm trigger conditions for automatic rinsing of rotary filters.

[0010] As a preferred method of the automatic flushing method for the rotary filter screen of the seawater direct-flow circulating water system described in this invention, the rotary filter screen programmable start-stop logic includes the following requirements: setting up a rotary filter screen flushing operation interface, adding a manual and automatic mode switching button; setting a timing cycle for the clock-controlled automatic flushing; and setting the overall logic for the automatic flushing of the rotary filter screen.

[0011] As a preferred embodiment of the automatic flushing method for the rotary filter screen of the seawater direct-flow circulating water system described in this invention, the automatic flushing setting timer cycle controlled by the clock includes the following steps: the automatic flushing program for the rotary filter screen corresponding to the running circulating water pump is triggered once every N hours, and the filter screen is flushed M times a day; the automatic flushing program for the rotary filter screen corresponding to the stopped circulating water pump is triggered once every 24 hours, and the flushing is performed at a fixed time every day, with each filter screen running continuously for X minutes each time.

[0012] As a preferred embodiment of the automatic flushing method for the rotating filter screen of the seawater direct-flow circulating water system described in this invention, the rotating filter screen programmable start-up logic includes a rotating filter screen programmable start-up logic and a rotating filter screen programmable shutdown logic.

[0013] As a preferred embodiment of the automatic flushing method for the rotary filter screen of the seawater direct-flow circulating water system described in this invention, the rotary filter screen programmable start-up logic includes the following steps: activating the automatic filter screen mode, issuing a secondary alarm for programmable flushing of the filter screen, and determining the tidal level difference; determining that the clock timing is met; starting the flushing water pump; determining the operating status of circulating water pump A and starting filter screen A; starting filter screen B and determining the operating status of circulating water pump B; starting filter screen C and then starting filter screen D; the rotary filter screen programmable shutdown logic includes the following steps: gradually shutting down filter screens A, B, C, and D; and shutting down the flushing water pump.

[0014] As a preferred embodiment of the automatic flushing method for the rotary filter screen of the seawater direct-flow circulating water system described in this invention, the alarm triggering conditions include: after starting the flushing water pump, if no flushing water pump operation signal is received or the flushing water pump outlet pressure P < 0.5 MPa is detected, the program is interrupted and an alarm is triggered; after stopping the flushing water pump, if no flushing water pump stop signal is received, the program is interrupted and an alarm is triggered; after starting a certain rotary filter screen, the program step is interrupted, jumps to the next step, and an alarm is triggered; after stopping a certain rotary filter screen, if no stop signal is received from the rotary filter screen, the program step is interrupted, jumps to the next step, and an alarm is triggered.

[0015] As a preferred embodiment of the automatic flushing method for the rotating filter screen of the seawater direct-flow circulating water system described in this invention, the following steps are interrupted after starting a certain rotating filter screen: the rotating filter screen does not receive a forward rotation signal; the rotating filter screen current is >8A; when the tidal difference is <L, the continuous operating time of the rotating filter screen is greater than Xmin; when the tidal difference is >L for the first time, the continuous operating time of the rotating filter screen is greater than 72h.

[0016] Secondly, to further address the problems existing in the periodic rinsing of rotating screens, this embodiment of the invention provides an automatic rinsing system for rotating screens in a seawater direct-flow circulating water system, including a hydrological data processing module, a data analysis module, a logic design module, and an alarm module. The hydrological data processing module is used to summarize the hydrological conditions of the circulating water system in a thermal power plant based on historical environmental characteristics. The data analysis module is used to collect and analyze experience in manually rinsing rotating screens. The logic design module is used to design the programmable start-up and shutdown logic for rotating screens based on experience in tidal level difference programmable start-up and manual experience. The alarm module is used to issue an alarm for program interruption during the automatic rinsing process of the rotating screen.

[0017] Thirdly, embodiments of the present invention provide a computer device, including a memory and a processor, wherein the memory stores a computer program, and the computer program, when executed by the processor, implements any step of the automatic rinsing method for the rotating filter screen of the seawater direct-flow circulating water system as described in the first aspect of the present invention.

[0018] Fourthly, embodiments of the present invention provide a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, it implements any step of the automatic flushing method for the rotating filter screen of the seawater direct-flow circulating water system as described in the first aspect of the present invention.

[0019] The beneficial effects of this invention are as follows: it significantly saves electricity; avoids human error in execution, effectively extends the lifespan of the rotary filter, and thus improves the safety of the circulating water system; the seawater direct-flow rotary filter programmable automatic flushing method includes start-stop logic and related alarms and trip interlocks, which improves the automation and intelligence level of the circulating water system, reduces the workload of operators and inspectors, and effectively improves the labor productivity of operation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0021] Figure 1 This is the operating interface of the rotating filter in Example 1.

[0022] Figure 2 This is the overall logic diagram for the automatic rinsing of the rotating filter in Example 2.

[0023] Figure 3 This is the DCS logic diagram for the automatic rinsing timing cycle of the rotating filter in Example 2.

[0024] Figure 4 The automatic rinsing timer cycle for the rotating filter screen in Example 2. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0028] Example 1

[0029] Reference Figure 1This is the first embodiment of the present invention, which provides an automatic flushing method for a rotating filter screen in a seawater direct-flow circulating water system, comprising the following steps:

[0030] S1: Based on the characteristics of the seawater environment, summarize the hydrological conditions of the operation of the circulating water system in thermal power plants.

[0031] Preferably, the seawater here is the East China Sea.

[0032] S2: Review the experience of manually rinsing rotating filters in the sea area where thermal power plants are located.

[0033] Furthermore, the manual rinsing experience is the manual rinsing experience of the rotating filter screen in the East China Sea area where Huaneng Yuhuan Power Plant is located.

[0034] Specifically, the manual flushing experience for the rotary filter screen in the East China Sea where Huaneng Yuhuan Power Plant is located is as follows: three times per shift plus once at low tide, each time for half an hour, ensuring the filter screen completes one full rotation for the best flushing effect; the outlet pressure of the flushing water pump should be greater than 0.5 MPa to ensure that the debris on the filter screen is thoroughly flushed in one go; the normal operating current of the filter screen is 5-6A, and if the filter screen motor current is greater than or equal to 8A, it indicates that there is significant resistance in the operation of the filter screen; the rotary filter screen of the standby pump does not need to be flushed frequently, once a day is sufficient; astronomical high tides occur on the first and fifteenth days of the lunar calendar, followed by several days of high tides. With a large amount of marine life and algae, the filter screen quickly becomes clogged, and the highest rate of filter screen clogging failures occurs during this period. Continuous rinsing should be maintained for 3-4 days. In winter, December, January, and February, due to ocean currents, there is a large amount of marine life. During spring tides, filter screen clogging and torque tripping abnormalities occur frequently. During this period, continuous rinsing should be maintained until no marine life is found on the filter screen surface before operation can be stopped. In the process of converting human experience into control logic, it was found through analysis that a tidal level difference greater than 6m indicates a spring tide. The DCS logic expression of 5 or 6 human experience points is realized by using the condition of a tidal level difference greater than 6m.

[0035] S3: The start-up and shutdown logic of the rotary filter screen is designed based on hydrological conditions, tidal difference programmable start-up experience and human experience.

[0036] The programmable start / stop logic for the rotary filter includes the following requirements:

[0037] S3.1: Set up the rotating filter washing operation interface and add a button to switch between manual and automatic modes.

[0038] Preferably, the "manual" mode allows for manual start-up and shutdown as needed; the "automatic" mode enables programmed automatic rinsing.

[0039] S3.2: Set the timing cycle for the clock-controlled automatic flushing.

[0040] The clock-controlled automatic flushing setting timing cycle includes the following steps.

[0041] The automatic flushing program for the rotating filter screen corresponding to the running circulating water pump is triggered once every N hours, and the filter screen is flushed M times a day; the automatic flushing program for the rotating filter screen corresponding to the stopped circulating water pump is triggered once every 24 hours, and the filter screen is flushed at a fixed time every day, with each filter screen running continuously for X minutes each time.

[0042] Specifically, starting from 8:20, the automatic flushing program for the rotating filter screen corresponding to the running circulating water pump is triggered once every 3 hours, and the flushing is performed 8 times a day, which is the "automatic flushing 3-hour cycle" program; the automatic flushing program for the rotating filter screen corresponding to the stopped circulating water pump is triggered once every 24 hours, and the flushing is performed at 8:20 every day, which is the "automatic flushing 24-hour cycle" program; each filter screen runs continuously for 30 minutes each time.

[0043] Furthermore, if the tidal difference is greater than 6m for the first time, the circulating water pump and the corresponding filter will run continuously for three days before being shut down. If the tidal difference is greater than 6m for the first time and the month is December, January, or February, the automatic shutdown signal will be locked, and the pump will be manually shut down after on-site inspection confirms no abnormalities.

[0044] S3.3: Set the main logic for automatic flushing of the rotating filter screen, and simultaneously set the auxiliary logic for the rotating filter screen, the auxiliary logic for the flushing water pump, etc.

[0045] Among them, circulating water pump A corresponds to two rotating filters A and B, and circulating water pump B corresponds to rotating filters C and D.

[0046] Furthermore, the design concept of the programmable start-stop logic includes the main ideas of automatic rinsing timing cycle of the rotating filter and automatic start-stop of the rotating filter.

[0047] The automatic rinsing cycle of the rotating filter includes: X represents the clock and Y represents the minute. For example, when the clock satisfies 7.8 < X < 8.2 and is rounded down, then X is 8. At the same time, when the minute satisfies 20 < Y < 30, that is, when the time is 08:20 to 08:30, the "automatic rinsing cycle of the rotating filter 24h" and the "automatic rinsing cycle of the rotating filter 3h" are triggered simultaneously. During the 10 minutes from 08:20 to 08:30, the interlocking completes the start-up of the rinsing water pump, rotating filter and other equipment in the subsequent program.

[0048] When the clock satisfies 10.8 < X < 11.2 and is rounded down, X is 11; and when the minute satisfies 20 < Y < 30, that is, when the time is 11:20 to 11:30, the "rotating filter automatic washing 3-hour cycle" is triggered again, and so on.

[0049] Furthermore, the rotary filter programmable start / stop logic includes rotary filter programmable start logic and rotary filter programmable stop logic.

[0050] The rotary filter's programmed start-up logic includes the following steps.

[0051] The first step is to activate the automatic filter mode, triggering a second-level alarm for filter programmable flushing to assess the moisture level difference.

[0052] Specifically, if the tidal level difference is greater than 6m for the first time, and the month is December, January, or February, then proceed to step three and step four; if the conditions of step four and step seven are met, that is, the circulating water pump operation signal is received, then the "continuous flushing for 72 hours" program is executed, and the filter screen is automatically stopped; if the conditions of step four and step seven are not met, that is, the circulating water pump operation signal is not received, then the "automatic flushing for 24 hours" program is executed.

[0053] Specifically, if the tidal level difference is greater than 6m for the first time, and the month is not December, January, or February, then proceed to the third and fourth steps; if the conditions of the fourth and seventh steps are met, i.e., the circulating water pump operation signal is received, then the "continuous flushing for 72 hours" program is executed; if the conditions of the fourth and seventh steps are not met, i.e., the circulating water pump operation signal is not received, then the "automatic flushing for 24 hours" program is executed.

[0054] Specifically, if the tidal level difference is less than 6m, then proceed to step two.

[0055] The second step is to determine if the clock timing is met and then proceed to the third and fourth steps. If the conditions of the fourth and seventh steps are met, i.e., the circulating water pump operation signal is received, then the "automatic flushing for 3 hours" program is executed. If the conditions of the fourth and seventh steps are not met, i.e., the circulating water pump operation signal is not received, then the "automatic flushing for 24 hours" program is executed.

[0056] Step 3: Start the flushing water pump.

[0057] Specifically, the conditions for starting the flushing water pump are: receiving a flushing water pump operation signal; and the flushing water pump outlet pressure > 0.5 MPa.

[0058] Step 4: Determine the operating status of circulating water pump A.

[0059] Specifically, the operating status of circulating water pump A is divided into: receiving the operating signal of circulating water pump A and not receiving the operating signal of circulating water pump A.

[0060] Step 5: Activate filter A.

[0061] Specifically, the conditions for starting filter A are: receiving the operation signal of filter A; receiving the forward rotation signal of filter A; and the current of filter A being less than 8A.

[0062] Step 6: Activate filter B.

[0063] Specifically, the conditions for activating filter B are: receiving a signal to start filter B; receiving a signal to rotate filter B in the forward direction.

[0064] Filter B has a current of less than 8A.

[0065] Step 7: Determine the operating status of circulating water pump B.

[0066] The operation status of circulating water pump B is divided into two categories: receiving a signal to operate circulating water pump B and not receiving a signal to operate circulating water pump B.

[0067] Step 8: Activate filter C.

[0068] Specifically, the conditions for starting the C filter are: receiving the C filter operation signal; receiving the C filter forward rotation signal; and the C filter current being less than 8A.

[0069] Step 9: Activate the D filter.

[0070] Specifically, the conditions for activating the D filter are: receiving the D filter operation signal; receiving the D filter forward rotation signal; and the D filter current being less than 8A.

[0071] Furthermore, the rotary filter programmable shutdown logic includes: Step 10: Shut down filter A.

[0072] Specifically, the conditions for shutting down filter A are: filter A has been running continuously for 30 minutes; a shutdown signal for filter A is received; the forward rotation signal for filter A is lost; and the current of filter A reaches 0.

[0073] Step 11: Shut down filter B.

[0074] Specifically, the conditions for shutting down filter B are: filter B has been running continuously for 30 minutes; a shutdown signal for filter B is received; the forward rotation signal for filter B is lost; and the current of filter B reaches 0.

[0075] Step 12: Stop using filter C.

[0076] Specifically, the conditions for shutting down filter C are: filter C has been running continuously for 30 minutes; a shutdown signal for filter C is received; the forward rotation signal for filter C is lost; and the current of filter C drops to 0.

[0077] Step 13: Stop using filter D.

[0078] Specifically, the conditions for shutting down the D filter are: the D filter has been running continuously for 30 minutes; a shutdown signal for the D filter is received; the forward rotation signal for the D filter is lost; and the current of the D filter reaches 0.

[0079] S4: Design the alarm trigger conditions for automatic flushing of the rotating filter.

[0080] The alarm triggering conditions include:

[0081] S4.1: After starting the flushing water pump, if no flushing water pump operation signal is received or the flushing water pump outlet pressure P < 0.5MPa is detected, the program will be interrupted and an alarm will be triggered.

[0082] S4.2: If no shutdown signal is received after the flushing water pump has been stopped, the program will be interrupted and an alarm will be triggered.

[0083] S4.3: After starting a certain rotating filter, the program is interrupted, jumps to the next step and issues an alarm.

[0084] Specifically, the following steps may cause the program to be interrupted after starting a certain rotating filter: the rotating filter does not receive a forward rotation signal; the rotating filter current is >8A; when the tide level difference is <6m, the continuous running time of the rotating filter is greater than 30min; when the tide level difference is >6m for the first time, the continuous running time of the rotating filter is greater than 72h.

[0085] S4.4: After a rotating filter is shut down, if the rotating filter does not receive a shutdown signal, the procedure is interrupted, jumps to the next step, and an alarm is triggered.

[0086] This embodiment also provides an automatic flushing system for the rotary filter screen of a seawater direct-flow circulating water system, in order to further solve the problems existing in the periodic flushing of the rotary filter screen.

[0087] The automatic rotary filter flushing system for a seawater direct-flow circulating water system includes a hydrological data processing module, a data analysis module, a logic design module, and an alarm module. The hydrological data processing module is used to summarize the hydrological conditions of the circulating water system in thermal power plants based on historical environmental characteristics. The data analysis module is used to collect and analyze experience in manual flushing of the rotary filter. The logic design module is used to design the programmable start-up and shutdown logic of the rotary filter based on experience in tidal level difference programmable start-up and manual experience. The alarm module is used to provide an alarm for program interruption during the automatic flushing process of the rotary filter.

[0088] This embodiment also provides a computer device applicable to the automatic flushing method of a rotating filter screen in a seawater direct-flow circulating water system, including:

[0089] The system includes a memory and a processor. The memory stores computer-executable instructions, and the processor executes these instructions to implement the automatic rinsing method for the rotating filter screen of the seawater direct-flow circulating water system as described in the above embodiments.

[0090] The computer device can be a terminal, comprising a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0091] This embodiment also provides a storage medium storing a computer program that, when executed by a processor, implements the automatic rinsing method for the rotating filter screen of a seawater direct-flow circulating water system as proposed in the above embodiments.

[0092] In summary, the automatic flushing method and system for a seawater direct-flow circulating water system proposed in this invention significantly saves electricity; avoids human error in execution, effectively extends the lifespan of the rotating filter, and thus improves the safety of the circulating water system; the programmable automatic flushing method for the seawater direct-flow rotating filter includes start-stop logic and related alarms and trip interlocks, improving the automation and intelligence level of the circulating water system, reducing the workload of operators and inspectors, and effectively improving operational labor productivity.

[0093] Example 2

[0094] Reference Figures 2-4 This is the second embodiment of the present invention. Based on the first embodiment, specific experimental data of this experiment are provided to verify its beneficial effects.

[0095] Scenario 1: The tidal level difference is greater than 6m for the first time in December, January and February, and both circulating water pumps A and B are running.

[0096] like Figure 2As shown, when the rotary filter washing program interface is set to automatic operation for rotary filters A, B, C, and D, the tidal level difference is first assessed. If the difference is greater than 6m for the first time, it is considered a spring tide, and the washing water pumps are interlocked and activated. If the A circulating water pump is running, the corresponding A and B rotary filters are interlocked and activated. If the B circulating water pump is running, the corresponding C and D rotary filters are interlocked and activated. If the month is December, January, or February, the A, B, C, and D rotary filters will run continuously. After the filter surface is checked and found to be clean, the A, B, C, and D rotary filters are manually stopped, and then the washing water pumps are manually stopped, ending the washing program.

[0097] Scenario 2: The tidal level difference is greater than 6m for the first time in December, January and February. Either circulating water pump A or circulating water pump B is running. Here, we take the case where circulating water pump A is running and circulating water pump B is not running as an example.

[0098] like Figure 2 As shown, when the rotary filter flushing program interface is set to automatic operation for rotary filters A, B, C, and D, the tidal level difference is first assessed. If the difference is greater than 6m for the first time, it is considered a spring tide, and the flushing water pumps are interlocked and started. If the A circulating water pump is running, the corresponding A and B rotary filters are interlocked and started. If the B circulating water pump is not running, the corresponding C and D rotary filters are interlocked and started after the "automatic flushing 24-hour cycle" timer is met. After running for 30 minutes, the C and D rotary filters are interlocked and stopped. If the month is December, January, or February, the corresponding A and B rotary filters are continuously running. After the filter surface is checked and found to be clean, the A and B rotary filters are manually stopped, and then the flushing water pumps are manually stopped, ending the flushing program.

[0099] Scenario 3: The tidal level difference is greater than 6m for the first time, and the month is not December, January, or February. Either circulating water pump A or circulating water pump B is running. Here, we take the case where circulating water pump A is running and circulating water pump B is not running as an example.

[0100] like Figure 2 As shown, when the rotating filter flushing program interface is set to automatic for rotating filters A, B, C, and D, the tidal level difference is first assessed. If the difference is greater than 6m for the first time, it is considered a spring tide, and the flushing water pumps are interlocked and activated. If the A circulating water pump is running, the corresponding A and B rotating filters are interlocked and activated. If the B circulating water pump is not running, the flushing will continue until the "automatic flushing 24-hour cycle" timer is met (e.g., ...). Figure 3 and Figure 4 The corresponding C and D rotating filters are interlocked and start. After running for 30 minutes, the C and D rotating filters are interlocked and shut down. If the month is not December, January, or February, the corresponding A and B rotating filters of the circulating water pump will run continuously for 72 hours and then automatically shut down. The flushing water pump will also automatically stop, and the flushing program will end.

[0101] Scenario 4: The tidal level difference is less than 6m, and the month is not December, January, or February. Either circulating water pump A or circulating water pump B is running, with circulating water pump A running and circulating water pump B not running as an example.

[0102] like Figure 2 As shown, in the rotary filter flushing program interface, when rotating filters A, B, C, and D are set to automatic, the first step is to determine the tidal level difference. If it is less than 6m, the A circulating water pump is activated. If the "automatic flushing for 3 hours" timer is met (e.g....), the automatic flushing will continue. Figure 3 and Figure 4 If the flushing pump is not running, the corresponding rotary filters A and B will start interlocked. If the B circulating water pump is not running, the corresponding rotary filters C and D will start interlocked once after the "automatic flushing 24-hour cycle" timer is met. If the month is not December, January, or February, the rotary filters A, B, C, and D will run continuously for 30 minutes and then automatically stop, after which the flushing pump will stop automatically, and the flushing program will end. Next, the "automatic flushing 3-hour cycle" will be triggered every 3 hours, and the corresponding rotary filters A and B will start interlocked and run continuously for 30 minutes before interlocking and stopping, the flushing pump will stop automatically, and the flushing program will end.

[0103] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An automatic flushing method for a rotating filter screen in a seawater direct-flow circulating water system, characterized in that: include, Based on the characteristics of the seawater environment, summarize the hydrological conditions related to the operation of the circulating water system in thermal power plants; Reviewing the experience of manually rinsing rotating screens in the sea areas where thermal power plants are located; The rotary filter's start-up and shutdown logic was designed based on hydrological conditions, tidal level difference, and human experience. Design the alarm trigger conditions for automatic rinsing of the rotating filter screen; The rotary filter's programmed start / stop logic includes: The rotating filter washing operation interface has been set up, and buttons for switching between manual and automatic modes have been added. The timing cycle is set for the automatic flushing system controlled by a clock. Configure the overall logic for automatic rinsing of the rotating filter; The clock-controlled automatic flushing setting timing cycle includes the following steps. The automatic flushing program for the rotating filter screen, which corresponds to the running circulating water pump, is triggered once every N hours, and the filter screen is flushed M times per day. The corresponding rotary filter flushing program for shutting down the circulating water pump is triggered once every 24 hours and flushed at a fixed time every day, with each filter running continuously for X minutes each time. The rotary filter programmable start / stop logic includes rotary filter programmable start logic and rotary filter programmable stop logic; The rotary filter programmable start-up logic includes the following steps. When the filter is switched to automatic mode, a second-level alarm for filter programmable flushing is issued to determine the moisture level difference. Determine if the clock timing is satisfied; Start the flushing water pump; Determine the operating status of circulating water pump A, and start filter A and filter B; then determine the operating status of circulating water pump B. After activating filter C, activate filter D. The programmed shutdown logic for the rotating filter includes the following steps. Gradually shut down filters A, B, C, and D; Shut down the flushing water pump.

2. The automatic flushing method for the rotating filter screen of a seawater direct-flow circulating water system as described in claim 1, characterized in that: The alarm triggering conditions include, If no flushing water pump operation signal is received after starting the flushing water pump or if the flushing water pump outlet pressure P < 0.5MPa is detected, the program will be interrupted and an alarm will be triggered. After the flushing water pump was shut down, no shutdown signal was received, the program was interrupted and an alarm was triggered. The program interrupts after a certain rotating filter is started, jumps to the next step, and triggers an alarm. After a rotating filter is shut down, if the rotating filter does not receive a shutdown signal, the procedure is interrupted, jumps to the next step, and an alarm is triggered.

3. The automatic flushing method for the rotary filter screen of a seawater direct-flow circulating water system as described in claim 2, characterized in that: The procedure interruption after activating a certain rotating filter includes... The rotating filter did not receive a forward rotation signal; Rotary filter current >8A; When the tidal level difference is less than L, the continuous operating time of the rotating filter is greater than X min; When the tidal level difference is greater than L for the first time, the rotating filter screen runs continuously for more than 72 hours.

4. An automatic rinsing system for a rotary filter screen in a seawater direct-flow circulating water system, employing the automatic rinsing method for a rotary filter screen in a seawater direct-flow circulating water system as described in any one of claims 1 to 3, characterized in that: It also includes a hydrological data processing module, a data analysis module, a logic design module, and an alarm module; The hydrological data processing module is used to summarize the hydrological conditions of the thermal power plant's circulating water system based on historical environmental characteristics. The data analysis module is used to collect and analyze experience in manually rinsing rotating filters; The logic design module is used to design the rotary filter's programmable start-up and shutdown logic based on experience with tidal level difference programmable start-up and manual experience. The alarm module is used to issue an alarm for program interruption during the automatic rinsing process of the rotating filter screen.

5. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 3.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 3.

Images