Open-type filter control method and system for thermal power plants

Abstract

This invention provides a method and system for controlling open-type water filter screens in thermal power plants. The method includes: determining the current operating mode of the open-type water filter screen equipment when a rotary filter screen switching switch is detected to be switched to the automatic control position; determining the action interval duration and continuous operating duration of the rotary filter screen based on the current operating mode; using the detection of the rotary filter screen switching switch to the automatic control position as the starting point for timing, and controlling the start-up of the drain door actuator and the rotary filter screen actuator after the timing duration meets the action interval duration; determining the start-up duration of the drain door actuator and the rotary filter screen actuator, and controlling the stop operation of the drain door actuator and the rotary filter screen actuator after the start-up duration meets the continuous operating duration. By controlling the duration of the equipment action interval and the continuous opening, the start-up and stop of the drain door actuator and the rotary filter screen actuator are controlled, making the control process simpler and the control reliability higher.

Description

Technical Field

[0001] This invention relates to the field of thermal power generation technology, and in particular to a method and system for controlling open-type filter screens in thermal power plants. Background Technology

[0002] The open-type water filter equipment in thermal power plants is equivalent to a water purification device. It mainly uses an open-type rotating water filter to directly intercept impurities in the water, purifying suspended solids, particulate matter and other impurities, reducing dirt, bacteria, rust and other contaminants, thus purifying the water. The purified water will then enter the thermal power generating unit.

[0003] In related technologies, open-type filter control is typically achieved using differential pressure control. This involves measuring the differential pressure between the inlet and outlet of the filter cartridge, and activating the rotating filter when the differential pressure is too high. However, this control method requires complex control logic, resulting in a complicated control process. Furthermore, if the rotating filter becomes clogged or the differential pressure measuring tube is contaminated, inaccurate differential pressure measurements often occur, leading to insufficient reliability of the control system.

[0004] Therefore, traditional open-screen filter control schemes suffer from complex control processes and low control reliability. Summary of the Invention

[0005] This invention provides a method and system for controlling open-type filters in thermal power plants, which solves the problems of complex control process and low control reliability of traditional open-type filter control schemes.

[0006] On one hand, the present invention provides a control method for open-type filter screens in thermal power plants, applied to open-type water filter screen equipment. The method is executed by a control device, which is connected to a rotary filter screen switching switch, a drain valve actuator, and a rotary filter screen actuator, respectively. The method includes:

[0007] When the rotary filter screen switching switch is detected to switch to the automatic control position, the current working mode of the open water filter screen device is determined;

[0008] Based on the current working mode, determine the action interval and continuous working time of the rotating filter.

[0009] The timing starts when the rotating filter screen switching switch is detected to the automatic control position. When the timing duration meets the action interval duration, the drain door actuator and the rotating filter screen actuator are controlled to start running.

[0010] The start-up duration of the drain door actuator and the rotary filter actuator is determined. When the start-up duration meets the continuous working duration, the drain door actuator and the rotary filter actuator are controlled to stop operating.

[0011] According to the open filter control method for thermal power plants provided by the present invention, the control device includes a first time relay for timing, a first contactor connected to a rotating filter actuator, and a second contactor connected to a drain door actuator and controlling the drain door actuator to open.

[0012] When the timing duration meets the specified action interval duration, the actuators for the sewage gate and the rotating filter screen are activated, including:

[0013] When the timing duration obtained from the first time relay is detected to meet the dynamic interval duration, the first contactor and the second contactor are both controlled to close to activate the drain door actuator and the rotating filter actuator.

[0014] According to the open filter control method for thermal power plants provided by the present invention, the control device includes a second time relay for timing, a first contactor connected to a rotating filter actuator, and a third contactor connected to a drain door actuator and controlling the drain door actuator to close.

[0015] Once the startup duration meets the continuous working duration, the actuators for the drain gate and the rotating filter screen are controlled to stop operating, including:

[0016] When the start-up duration obtained from the second time relay is detected to meet the continuous working duration, the first contactor is controlled to open and the third contactor is controlled to close, so as to shut down the drain door actuator and the rotating filter actuator.

[0017] According to the open-type filter control method for thermal power plants provided by the present invention, based on the current working mode, the method determines the action interval and continuous working time of the rotating filter, including:

[0018] Based on the operating status and seasonal conditions of thermal power generating units, various working modes are set for the open water filter equipment.

[0019] Based on the characteristics of each working mode, the action interval and continuous working time of the rotating filter are set for each working mode.

[0020] A time comparison table is created by taking the working modes, mode characteristics, and the action interval and continuous working time of the rotating filter under each working mode as table contents.

[0021] Determine the action interval duration and continuous working duration corresponding to the current working mode from the duration lookup table.

[0022] According to the open-type filter control method for thermal power plants provided by the present invention, based on the operating status and seasonal status of the thermal power generating unit, multiple operating modes corresponding to the open-type water filter equipment are set, including:

[0023] Based on the operating status of the thermal power generating unit, the open water filter equipment is set to the unit start-up mode, the unit continuous operation mode, and the high-frequency rotation mode.

[0024] Based on the seasonal conditions, the summer mode and winter mode corresponding to the open water filter device are set.

[0025] According to the open-type filter control method for thermal power plants provided by the present invention, the method further includes:

[0026] When the rotating filter switch is detected to be switched to the manual control position, a manual trigger command is received;

[0027] Based on the manual trigger command, the sewage gate actuator and the rotating filter actuator are controlled to stop operating.

[0028] According to the open-type filter control method for thermal power plants provided by the present invention, the method further includes:

[0029] The control duration is obtained by taking the detection of the rotating filter switch switching to the automatic control position as the starting point of the timing.

[0030] When the control duration meets the preset cycle duration, the drain door actuator and the rotating filter actuator are controlled to stop operating.

[0031] According to the open-type filter control method for thermal power plants provided by the present invention, the method further includes:

[0032] The change of the sewage gate actuator from the open state to the closed state and the change of the rotating filter actuator from the rotating state to the stopped rotating state are taken as one control cycle, and the number of control cycles in the current control cycle is determined.

[0033] When the number of control cycles meets the preset time threshold, the drain door actuator and the rotating filter actuator are stopped.

[0034] On the other hand, the present invention also provides an open filter screen control system for thermal power plants, which is applied to open water filter screen equipment. The system includes: a rotary filter screen switching switch and a control device.

[0035] The control device is connected to the rotary filter switch, the drain door actuator, and the rotary filter actuator, respectively.

[0036] The control device is used to: determine the current working mode of the open water filter device when the rotary filter switch is detected to be switched to the automatic control position; determine the action interval duration and continuous working duration of the rotary filter based on the current working mode; take the detection of the rotary filter switch being switched to the automatic control position as the starting point for timing, and control the drain door actuator and the rotary filter actuator to start running after the timing duration meets the action interval duration; determine the start duration of the drain door actuator and the rotary filter actuator, and control the drain door actuator and the rotary filter actuator to stop running after the start duration meets the continuous working duration.

[0037] According to the open filter control system for thermal power plants provided by the present invention, the control equipment includes: a first time relay, a second time relay, a first contactor, a second contactor, and a third contactor;

[0038] The first time relay is connected to the first contactor and the second contactor respectively, the second time relay is connected to the first contactor and the third contactor respectively, the first contactor is also connected to the rotary filter actuator, and the second contactor and the third contactor are both connected to the drain door actuator.

[0039] The second contactor is used to open the drain door actuator, and the third contactor is used to close the drain door actuator.

[0040] The open-type filter control method and system for thermal power plants provided by this invention determines the current operating mode of the open-type water filter equipment when the rotary filter switch is detected to be switched to the automatic control position. Based on the current operating mode, the action interval and continuous working time of the rotary filter are determined. Taking the detection of the rotary filter switch switching to the automatic control position as the starting point of timing, when the timing duration meets the action interval duration, the drain door actuator and the rotary filter actuator are controlled to start operation. The start-up duration of the drain door actuator and the rotary filter actuator is determined, and when the start-up duration meets the continuous working time, the drain door actuator and the rotary filter actuator are controlled to stop operation. Since the entire control process is mainly achieved through timing and on / off methods, controlling the start and stop of the drain door actuator and the rotary filter actuator by the duration of the equipment action interval and the continuous opening, the control process is simpler and the control reliability is higher. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0042] Figure 1 This is a structural schematic diagram of an open-type water filter screen device;

[0043] Figure 2 This is a schematic flowchart of the open filter control method for thermal power plants provided in an embodiment of the present invention;

[0044] Figure 3 This is a schematic diagram showing the arrangement of key components in the open filter control process of a thermal power plant. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0046] This embodiment relates to the field of thermal power generation, and can be specifically applied to the control scenario of open water filter equipment. Figure 1 An example is shown of the structure of an open water filter device, such as... Figure 1 As shown, the open-type water filter equipment specifically includes: a rotary filter motor 110, a filter cylinder 120, a water outlet 130, a water inlet 140, a drain valve actuator 150, and a drain outlet 160.

[0047] Open-loop circulating water drawn from a river or reservoir enters the rotating filter screen in the filter cylinder 120 through the inlet 140. By periodically activating the open-loop water filter screen, the rotating filter screen motor 110 is energized and rotates, causing the purified water to be discharged from the outlet 130 and enter the thermal power generator unit. At the same time, the sewage discharge door actuator 150 opens to automatically discharge sewage from the sewage discharge port 160, thereby achieving the purpose of water purification.

[0048] Traditional open-screen filter control schemes using differential pressure control require complex control logic, resulting in a complicated control process. Furthermore, this method is prone to inaccurate differential pressure measurements if the rotating filter becomes clogged or the differential pressure measuring tube is contaminated, leading to insufficient reliability in the control circuit. Therefore, this embodiment provides a solution to these problems.

[0049] The following is combined Figures 2 to 3 This invention describes the specific scheme of the open filter control method and system for thermal power plants provided in the embodiments of the present invention.

[0050] Figure 2 This is a flowchart illustrating the open filter control method for thermal power plants provided in an embodiment of the present invention.

[0051] like Figure 2 As shown in the embodiment of the present invention, the open filter screen control method for thermal power plants can be applied to open water filter screen equipment. The execution subject of the method can be a control device, which is connected to a rotary filter screen switching switch, a drain door actuator, and a rotary filter screen actuator. The method mainly includes the following steps:

[0052] Step 210: When the rotary filter screen switching switch is detected to the automatic control position, determine the current working mode of the open water filter screen device.

[0053] In this embodiment, the rotary filter switch can freely switch between manual and automatic control modes. Figure 3 An exemplary illustration shows the component arrangement structure upon which the open-loop filter control method for thermal power plants is based, such as... Figure 3 As shown, the rotary filter screen switching switch DK is connected to the line that connects to the drain door actuator DZ and the rotary filter screen actuator DL.

[0054] Step 220: Based on the current working mode, determine the action interval and continuous working time of the rotating filter.

[0055] It is understandable that both the rotation interval and continuous working time of the rotating filter are preset time thresholds based on the working mode.

[0056] Step 230: The timing starts when the rotating filter screen switch is detected to switch to the automatic control position. When the timing duration meets the action interval duration, the drain door actuator and the rotating filter screen actuator are started to run.

[0057] In this embodiment, in order to ensure the working safety of the rotating filter, the action interval of the rotating filter is used as the control basis. When switching to the automatic control position, the timing starts. After the action interval is reached, the next round of action is triggered, that is, the drain door actuator and the rotating filter actuator are started to run. At this time, the drain door is opened and the rotating filter starts to rotate.

[0058] Step 240: Determine the start-up duration of the drain door actuator and the rotary filter actuator. Once the start-up duration meets the continuous working duration, control the drain door actuator and the rotary filter actuator to stop operating.

[0059] This embodiment also uses the continuous working time of the rotating filter as the control basis. When the start-up time of the drain door actuator and the rotating filter actuator reaches the continuous working time, the drain door actuator and the rotating filter actuator are controlled to stop running. At this time, the drain door is closed and the rotating filter stops rotating.

[0060] This embodiment achieves effective control of the open filter screen through duration and on / off control methods, making the control process simpler and more reliable.

[0061] In one embodiment, see Figure 3 The control device includes a first time relay 2SJ for timing, a first contactor CQL connected to the rotary filter actuator DL, and a second contactor CQK connected to the drain door actuator DZ and controlling the opening of the drain door actuator.

[0062] Once the timing period meets the action interval, the actuators for controlling the drain door and the rotating filter screen will start operating, including:

[0063] When the timing duration obtained by the first time relay 2SJ is detected to meet the dynamic interval duration, the first contactor CQL and the second contactor CQK are both closed to start the drain door actuator DZ and the rotary filter actuator DL.

[0064] In one embodiment, see Figure 3 The control device may also include a second time relay 1SJ for timing, a first contactor CQL connected to the rotary filter actuator DL, and a third contactor CQG connected to the drain door actuator DZ and controlling the closing of the drain door actuator.

[0065] Once the startup duration meets the continuous working duration, the actuators controlling the drain gate and the rotary filter screen will stop operating. Specifically, this includes:

[0066] When the start-up duration obtained from the second time relay 1SJ is detected to meet the continuous working duration, the first contactor CQL is controlled to open and the third contactor CQG is controlled to close, so as to shut off the drain door actuator DZ and the rotary filter actuator DL.

[0067] It is not difficult to see that the control process in this embodiment is mainly achieved by using multiple time relays and contactors in combination, mainly involving timing and on / off control processes. Compared with the complex control logic settings such as data acquisition, processing, and comparison, the control scheme adopted in this embodiment is simpler and has higher control reliability.

[0068] In some embodiments, both the first time relay and the second time relay can be equipped with two sets of delay contacts. Specifically, the scale value can be adjusted using the digital adjustment knob on the dial, the time unit can be adjusted to seconds, minutes or hours using the time unit adjustment button, and the time pointer can be adjusted to point to the desired time using the pointer adjustment knob.

[0069] The structure of the time relay described above allows for convenient and free adjustment of the action interval and continuous working duration.

[0070] In one embodiment, the action interval and continuous working duration of the rotating filter are determined based on the current working mode, specifically including:

[0071] The first step is to set up multiple working modes for the open-type water filter equipment based on the operating status and seasonal conditions of the thermal power generating unit.

[0072] The second step is to set the interval and duration of the rotating filter's operation in each working mode, based on the characteristics of each working mode.

[0073] The third step is to create a time comparison table by taking the working mode, mode characteristics, and the action interval and continuous working time of the rotating filter under each working mode as table content.

[0074] The fourth step is to determine the action interval duration and continuous working duration corresponding to the current working mode from the duration comparison table.

[0075] In one embodiment, based on the operating status and seasonal conditions of the thermal power generating unit, multiple operating modes are set for the open-type water filter equipment, specifically including:

[0076] Based on the operating status of thermal power generating units, the open-type water filter equipment is set to the unit start-up mode, unit continuous operation mode and high-frequency rotation mode.

[0077] Based on seasonal conditions, set the corresponding summer mode and winter mode for the open water filter equipment.

[0078] For the unit's initial startup mode, the circulating water contains a lot of impurities, requiring more frequent purification of the circulating water. Therefore, the action interval can be set to 1 hour, and the continuous working time can be set to 5 minutes.

[0079] For the unit's continuous operation mode, this mode is characterized by fewer impurities in the circulating water. At this time, the circulating water can be purified at a lower frequency, so the action interval can be set to 3 hours and the continuous working time can be set to 2 minutes.

[0080] For the high-frequency rotation mode, this mode is characterized by the occasional occurrence of a lot of impurities in the circulating water and a low filter outlet pressure. In this case, the circulating water needs to be purified at a high frequency. Therefore, the action interval can be set to 20 minutes and the continuous working time can be set to 5 minutes.

[0081] For the summer mode, which is characterized by more rain and poorer circulating water quality with more impurities, the circulating water needs to be purified frequently. Therefore, the action interval can be set to 30 minutes and the continuous working time can be set to 5 minutes.

[0082] Winter mode is characterized by less rain, better circulating water quality, and fewer impurities. In this mode, the circulating water can be purified at a low frequency, so the action interval can be set to 6 hours and the continuous working time can be set to 2 minutes.

[0083] In practical applications, based on the various working modes, their characteristics, and the interval and duration of the rotating filter's operation under each mode, a time comparison table is established as follows:

[0084] Table 1 Duration Comparison Table

[0085]

[0086] Based on the unit's operating conditions and the impact of seasons on circulating water, this embodiment sets multiple working modes and sets corresponding action intervals and continuous working durations for each working mode. This allows for flexible control of the open filter screen according to actual conditions, making the control process more targeted and reliable.

[0087] In one embodiment, the above-described open-loop filter control method for thermal power plants may further include:

[0088] When the rotary filter switch is detected to be switched to the manual control position, a manual trigger command is received;

[0089] Based on manual trigger commands, control the start or stop of the sewage gate actuator and / or the rotating filter actuator.

[0090] Manual control can meet control needs in some special situations, such as when some key components in the control equipment fail, or when there is an emergency requiring human intervention. In such cases, manual intervention can be carried out in a timely manner to ensure the safety of the control process.

[0091] In practical applications, such as Figure 3 As shown, when the rotary filter switch DK is closed, it is in the automatic control position; when the rotary filter switch DK is open, it is in the manual control position.

[0092] When in manual control mode, manual trigger commands can be initiated via the manual opening button KA of the drain door actuator, the manual closing button GA of the drain door actuator, the manual opening button TA of the rotary filter, and the manual closing button QA of the rotary filter, thereby realizing the opening and closing control of the drain door actuator DZ and the rotary filter actuator DL ​​in manual control mode.

[0093] In some embodiments, the control device also includes a valve closed indicator light LD1 and a valve open indicator light LD2, both of which are connected to the flashing contact SW inside the drain gate.

[0094] In some embodiments, the manual turn button TA for rotating the filter is also connected to the delay switch KW, the first time relay 2SJ is also connected to the first timer indicator LD4, and the second time relay 1SJ is also connected to the second timer indicator LD3.

[0095] In one embodiment, the open-loop filter control method for thermal power plants may further include:

[0096] The control duration is obtained by taking the detection of the rotary filter switch switching to the automatic control position as the starting point of the timing.

[0097] When the control duration meets the preset cycle duration, the control valve actuator and the rotary filter actuator stop operating.

[0098] In one embodiment, the open-loop filter control method for thermal power plants may further include:

[0099] The process of switching the sewage gate actuator and the rotary filter actuator from the open state to the closed state is considered as one control cycle, and the number of control cycles in the current control cycle is determined.

[0100] When the number of control cycles meets the preset time threshold, the control valve actuator and the rotary filter actuator stop operating.

[0101] In this embodiment, since the opening and closing processes of the drain door actuator and the rotary filter actuator can be executed cyclically within a control cycle, two cycle termination control schemes are set up to ensure that the cyclic execution process can be stopped when necessary. One scheme uses the control duration of the cyclic execution process as the termination control basis. When the control duration meets the preset cycle duration, the drain door actuator and the rotary filter actuator are stopped. The other scheme uses the number of control rounds in the cyclic execution process as the basis. When the number of control rounds meets a preset time threshold, the drain door actuator and the rotary filter actuator are stopped.

[0102] In summary, the open filter control method for thermal power plants provided by the embodiments of the present invention can realize open filter control by using timing and on / off control methods. The control link does not require complex control logic, and mainly uses time relays and triggers to achieve the action. The control process is simpler and the control reliability and stability are higher.

[0103] Based on the same general inventive concept, this invention also protects an open-type filter control system for thermal power plants. The open-type filter control system for thermal power plants provided by this invention will be described below. The open-type filter control system for thermal power plants described below can be referred to in correspondence with the open-type filter control method for thermal power plants described above.

[0104] The open filter control system for thermal power plants provided in this invention can be applied to open water filter equipment. The system specifically includes: a rotary filter switching switch and control equipment.

[0105] The control equipment is connected to the rotary filter switch, the drain door actuator, and the rotary filter actuator, respectively.

[0106] The control equipment is used to: determine the current operating mode of the open water filter device when the rotary filter switch is detected to be switched to the automatic control position; determine the action interval and continuous working time of the rotary filter based on the current operating mode; take the detection of the rotary filter switch being switched to the automatic control position as the starting point for timing, and control the drain door actuator and the rotary filter actuator to start running after the timing time meets the action interval; determine the start-up time of the drain door actuator and the rotary filter actuator, and control the drain door actuator and the rotary filter actuator to stop running after the start-up time meets the continuous working time.

[0107] In one embodiment, the control device specifically includes: a first time relay, a second time relay, a first contactor, a second contactor, and a third contactor;

[0108] The first time relay is connected to the first contactor and the second contactor respectively. The second time relay is connected to the first contactor and the third contactor respectively. The first contactor is also connected to the rotary filter actuator. The second contactor and the third contactor are both connected to the drain door actuator.

[0109] The second contactor is used to open the drain door actuator, and the third contactor is used to close the drain door actuator.

[0110] It should be noted that the specific arrangement of the first time relay, second time relay, first contactor, second contactor, and third contactor in this embodiment can be found in [reference needed]. Figure 3As shown, the specific configuration schemes for the first time relay, the second time relay, the first contactor, the second contactor, and the third contactor have already been described in the embodiments of the relevant method, so they will not be repeated here.

[0111] The solution provided in this embodiment mainly utilizes time relays and contactors in the control process, resulting in higher stability, greater reliability, and effectively reduced control costs.

[0112] 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling open-type filter screens in thermal power plants, characterized in that, The method, applied to open-type water filter equipment, is executed by a control device connected to a rotary filter screen switching switch, a drain door actuator, and a rotary filter screen actuator; the method includes: When the rotary filter screen switching switch is detected to switch to the automatic control position, the current working mode of the open water filter screen device is determined; Based on the current working mode, determine the action interval and continuous working time of the rotating filter. The timing starts when the rotating filter screen switching switch is detected to the automatic control position. When the timing duration meets the action interval duration, the drain door actuator and the rotating filter screen actuator are controlled to start running. The start-up duration of the drain door actuator and the rotary filter actuator is determined. When the start-up duration meets the continuous working duration, the drain door actuator and the rotary filter actuator are controlled to stop operating.

2. The method for controlling open-type filter screens in thermal power plants according to claim 1, characterized in that, The control device includes a first time relay for timing, a first contactor connected to the rotary filter actuator, and a second contactor connected to the drain door actuator and controlling the drain door actuator to open. When the timing duration meets the specified action interval duration, the actuators for the sewage gate and the rotating filter screen are activated, including: When the timing duration obtained from the first time relay is detected to meet the action interval duration, the first contactor and the second contactor are controlled to close to activate the drain door actuator and the rotating filter actuator.

3. The method for controlling open-type filter screens in thermal power plants according to claim 1, characterized in that, The control device includes a second time relay for timing, a first contactor connected to the rotary filter actuator, and a third contactor connected to the drain door actuator and controlling the drain door actuator to close. Once the startup duration meets the continuous working duration, the actuators for the drain gate and the rotating filter screen are controlled to stop operating, including: When the start-up duration obtained from the second time relay is detected to meet the continuous working duration, the first contactor is controlled to open and the third contactor is controlled to close, so as to shut down the drain door actuator and the rotating filter actuator.

4. The method for controlling open-type filter screens in thermal power plants according to claim 1, characterized in that, Based on the current working mode, the action interval and continuous working time of the rotating filter are determined, including: Based on the operating status and seasonal conditions of thermal power generating units, various working modes are set for the open water filter equipment. Based on the characteristics of each working mode, the action interval and continuous working time of the rotating filter are set for each working mode. A time comparison table is created by taking the working modes, mode characteristics, and the action interval and continuous working time of the rotating filter under each working mode as table contents. Determine the action interval duration and continuous working duration corresponding to the current working mode from the duration lookup table.

5. The method for controlling open-type filter screens in thermal power plants according to claim 4, characterized in that, Based on the operating status and seasonal conditions of the thermal power generating unit, multiple operating modes are set for the open-type water filter equipment, including: Based on the operating status of the thermal power generating unit, the open water filter equipment is set to the unit start-up mode, the unit continuous operation mode, and the high-frequency rotation mode. Based on the seasonal conditions, the summer mode and winter mode corresponding to the open water filter device are set.

6. The method for controlling open-type filter screens in thermal power plants according to claim 1, characterized in that, The method further includes: When the rotating filter switch is detected to be switched to the manual control position, a manual trigger command is received; Based on the manual trigger command, control the sewage door actuator and / or the rotating filter actuator to start or stop.

7. The method for controlling open-type filter screens in thermal power plants according to claim 1, characterized in that, The method further includes: The control duration is obtained by taking the detection of the rotating filter switch switching to the automatic control position as the starting point of the timing. When the control duration meets the preset cycle duration, the drain door actuator and the rotating filter actuator are controlled to stop operating.

8. The method for controlling open-type filter screens in thermal power plants according to claim 1, characterized in that, The method further includes: The transition from the open state to the closed state of the sewage gate actuator and the rotary filter actuator is considered as one control cycle, and the number of control cycles in the current control cycle is determined. When the number of control cycles meets the preset time threshold, the drain door actuator and the rotating filter actuator are stopped.

9. A control system for an open-type filter screen in a thermal power plant, characterized in that, The system, applicable to open-type water filtration equipment, includes: a rotary filter screen switching switch and a control device; The control device is connected to the rotary filter switch, the drain door actuator, and the rotary filter actuator, respectively. The control device is used to: determine the current working mode of the open water filter device when the rotary filter switch is detected to be switched to the automatic control position; determine the action interval duration and continuous working duration of the rotary filter based on the current working mode; take the detection of the rotary filter switch being switched to the automatic control position as the starting point for timing, and control the drain door actuator and the rotary filter actuator to start running after the timing duration meets the action interval duration; determine the start duration of the drain door actuator and the rotary filter actuator, and control the drain door actuator and the rotary filter actuator to stop running after the start duration meets the continuous working duration.

10. The open-type filter control system for thermal power plants according to claim 9, characterized in that, The control device includes: a first time relay, a second time relay, a first contactor, a second contactor, and a third contactor; The first time relay is connected to the first contactor and the second contactor respectively, the second time relay is connected to the first contactor and the third contactor respectively, the first contactor is also connected to the rotary filter actuator, and the second contactor and the third contactor are both connected to the drain door actuator. The second contactor is used to open the drain door actuator, and the third contactor is used to close the drain door actuator.

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