Surge control system and control method for air pipe of dust removal system

Abstract

The embodiment of the invention discloses a surge control system and method for an air pipe of a dust removal system. The system is provided with an air pipe, a main controller and a control subsystem, and the state of the air pipe corresponding to the control subsystem is remotely analyzed; the control subsystem comprises an IO substation, an air pressure sensor and an air supplement valve, and each sub-control system corresponds to one air pipe; the IO substation is used for obtaining the air pressure, collected by the air pressure sensor, of the air inlet of the air pipe and transmitting the air pressure to the main controller. The main controller is used for judging that the corresponding air pipe is in a surge state according to the air pressure at the air inlet of the air pipe, controlling the air supplementing valve to supplement air to the air pipe when the air pipe is in the surge state so as to adjust the exhaust air rate of the air pipe, further ensuring continuous and safe operation of the dust removal system, rapidly judging whether the air pipe is in the surge state when the surge phenomenon occurs, and controlling the air supplementing valve to supplement air to the air pipe when the surge phenomenon occurs. And the influence of surge is eliminated or reduced in time based on a surge strategy.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of fans, and in particular to a dust removal system air duct surge control system and control method. Background Art

[0002] Surge is one of the common faults in the operation of the fan, especially when the air volume fluctuates greatly. When the fan has severe and repeated surge, the impeller, bearings and their connecting parts may break due to excessive stress. In extreme cases, the entire fan and piping system may be damaged, which poses a direct threat to the safe and stable operation of the equipment.

[0003] In the dust removal system, the dynamic changes in the number of terminal equipment in operation and the air tightness of the dust removal area can easily cause an imbalance in the matching between the duct exhaust volume and the exhaust fan frequency, which in turn leads to duct surge. If the duct surge problem is not detected and handled in time, the duct amplitude may continue to increase, eventually causing damage to the duct equipment. At present, the dust removal system lacks a detection device specifically for duct surge, and there is no mature technology that can be directly applied for duct surge warning.

[0004] If the existing vibration sensors are used for vibration frequency detection, many problems will arise. First, a single vibration sensor can only monitor the local vibration of the air duct and cannot fully reflect the vibration status of the entire pipeline; and to achieve effective monitoring of the vibration status of the entire pipeline, multiple vibration sensors need to be installed to work together, which will not only bring high equipment procurement and installation costs, but also face many difficulties in the subsequent maintenance process, such as sensor troubleshooting and replacement. Summary of the invention

[0005] The present invention provides a dust removal system air duct surge control system and control method, so as to solve the problems of low accuracy, complex equipment and difficult maintenance of the existing anti-surge system.

[0006] In a first aspect, an embodiment of the present invention provides a dust removal system air duct surge control system, comprising at least one air duct; the control system comprises a main controller and at least one control subsystem, the control subsystem comprises an IO substation, an air pressure sensor and an air supply valve;

[0007] The main controller is connected to the IO substations of each control subsystem in communication, and the IO substations are electrically connected to the wind pressure sensor and the air supply valve respectively. The wind pressure sensor is arranged at the air inlet of the corresponding air duct, and the air supply valve is arranged on the side wall of the corresponding air duct;

[0008] The wind pressure sensor is used to collect the wind pressure at the air inlet of the air duct;

[0009] The air supply valve is used to supply air to the air duct;

[0010] The IO substation is used to obtain the wind pressure at the air inlet of the air duct collected by the wind pressure sensor and transmit it to the main controller;

[0011] The main controller is used to determine whether the corresponding air duct is in a surge state according to the wind pressure at the air inlet of the air duct, and when the air duct is in the surge state, control the air supply valve to supply air to the air duct to adjust the exhaust volume of the air duct.

[0012] Optionally, the control subsystem further includes a wind speed sensor, which is arranged at the air inlet of the corresponding air duct and is electrically connected to the IO substation;

[0013] The IO substation is used to obtain the wind speed at the air inlet of the air duct collected by the wind speed sensor and transmit it to the main controller;

[0014] The main controller is also used to control the opening of the air supply valve according to the wind speed at the air inlet of the air duct when the air duct is in a surge state, so as to adjust the amount of supply air to the air duct.

[0015] Optionally, the dust removal system further includes at least one fan and at least one frequency converter arranged corresponding to the air duct;

[0016] The fan is arranged at the end of the air duct; the frequency converter is electrically connected to the IO substation and the fan respectively;

[0017] The main controller is also used to send control commands to the IO substation. The IO substation controls the inverter to drive the fan to operate at a target speed based on the received control commands, and when the fan is in a surge state, reduces the power supply frequency of the inverter to drive the fan so that the fan operates at a speed lower than the target speed.

[0018] Optionally, the control system further comprises a human-machine interaction terminal, which is electrically connected to the main controller;

[0019] The main controller is also used to control the human-computer interaction terminal to display the working status of all air ducts;

[0020] When any air duct is in a surge state, the control human-computer interaction terminal displays a surge alarm signal.

[0021] In a second aspect, an embodiment of the present invention further provides a dust removal system duct surge control method, which is applied to the dust removal system duct surge control system of the first aspect. The control method includes:

[0022] The wind pressure at the air inlet of the air duct is collected by a wind pressure sensor;

[0023] According to the wind pressure at the air inlet of the air duct, it is judged that the corresponding air duct is in a surge state;

[0024] When the air duct is in a surging state, the air supply valve is controlled to supply air to the air duct to adjust the exhaust volume of the air duct.

[0025] Optionally, the wind pressure at the air inlet of the air duct is collected by a wind pressure sensor, including:

[0026] The wind pressure at the air inlet of the air duct is periodically collected at a first time interval by a wind pressure sensor;

[0027] According to the wind pressure at the air inlet of the air duct, it is judged that the corresponding air duct is in a surge state, including:

[0028] When the difference between the wind pressure at the air inlet of the air duct currently collected and the wind pressure at the air inlet of the air duct collected last time is greater than the first difference threshold, it is determined to be a fluctuation and counted;

[0029] Periodically counting the number of fluctuations in a second time interval; the second time interval has at least one first time interval;

[0030] When the number of fluctuations in the second time interval is greater than the first number threshold, it is determined that the corresponding air duct is in a surge state.

[0031] Optionally, the wind pressure at the air inlet of the air duct is collected by a wind pressure sensor, including:

[0032] The wind pressure sensor collects and records the wind pressure at the air inlet of the air duct in real time;

[0033] According to the wind pressure at the air inlet of the air duct, it is judged that the corresponding air duct is in a surge state, including:

[0034] Determine the maximum and minimum wind pressures at the air inlet of the air duct within a first time interval from the current moment to the present moment, calculate the pressure difference between the maximum and minimum wind pressures at the air inlet of the air duct, and if the pressure difference is greater than the first pressure difference, determine it as a fluctuation and count it;

[0035] After each fluctuation determination, the number of fluctuations in a second time interval from the current moment to the present moment is counted; the second time interval has at least one first time interval;

[0036] When the number of fluctuations in the second time interval is greater than the first number threshold, it is determined that the corresponding air duct is in a surge state.

[0037] Optionally, the control subsystem further includes a wind speed sensor, which is arranged at the air inlet of the corresponding air duct and is electrically connected to the IO substation;

[0038] The duct surge control method also includes:

[0039] Obtain the wind speed at the air inlet of the air duct collected by the wind speed sensor;

[0040] When the air duct is in a surging state, the air supply valve is controlled to supply air to the air duct to adjust the exhaust volume of the air duct, including:

[0041] When the fan is in a surge state, the opening of the air supply valve is controlled according to the wind speed at the air inlet of the air duct.

[0042] Optionally, when the fan is in a surge state, the opening of the air supply valve is controlled according to the wind speed at the air inlet of the air duct, including:

[0043] When the fan is in the surging state, the main controller confirms the preset air volume required for the current work demand according to the current dust removal task, and the main controller calculates the actual air intake volume according to the wind speed at the air inlet obtained by the wind speed sensor;

[0044] According to the formula: the opening variation of the supply air valve = (preset air volume - actual air volume) * supply air valve coefficient, the opening of the supply air valve is controlled; among which, the supply air valve coefficient is determined by the air duct parameters.

[0045] Optionally, the dust removal system further includes at least one fan and at least one frequency converter arranged corresponding to the air duct; the fan is arranged at the air inlet of the air duct; the frequency converter is electrically connected to the IO substation and the fan respectively;

[0046] The duct surge control method also includes:

[0047] The main controller sends a control command to the IO substation, and the IO substation controls the inverter to drive the fan to operate at the target speed according to the received control command;

[0048] When the fan is in a surge state, the power supply frequency of the inverter driving the fan is reduced so that the fan operates at a speed lower than the target speed.

[0049] The dust removal system duct surge control system provided in the embodiment of the present invention cleans dust in the target area by setting at least one air duct; the control system includes a main controller and at least one control subsystem, the control subsystem includes an IO substation, an air pressure sensor and an air supply valve, each sub-control system corresponds to an air duct, and remotely analyzes the state of the air duct corresponding to the control subsystem; the main controller is communicatively connected with the IO substation of each control subsystem, and the IO substation is electrically connected with the wind pressure sensor and the air supply valve respectively, the wind pressure sensor is set at the air inlet of the corresponding air duct, and the air supply valve is set on the side wall of the corresponding air duct; the wind pressure sensor is used to collect the wind pressure at the air inlet of the air duct; the air supply valve is used to supply air to the air duct, and the wind pressure data at the key position of the air duct can be directly obtained by the wind pressure sensor set at the inlet of the air duct, based on which it is judged whether the air duct is in a surge state. The IO substation is used to obtain the wind pressure at the air inlet of the air duct collected by the wind pressure sensor, and transmit it to the main controller for data transmission and control through the main controller and the IO substation, which simplifies the equipment structure and reduces the complexity of the system; the main controller is used to determine whether the corresponding air duct is in a surge state according to the wind pressure at the air inlet of the air duct, and when the air duct is in a surge state, control the air supply valve to supply air to the air duct to adjust the exhaust volume of the air duct, thereby ensuring the continuous and safe operation of the dust removal system, and quickly determine whether the air duct is in a surge state when surge occurs, and promptly eliminate or reduce the impact of surge based on the surge strategy. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a structural schematic diagram of a duct surge control system for a dust removal system provided by an embodiment of the present invention;

[0051] Figure 2 It is a flow chart of a method for controlling duct surge of a dust removal system provided by an embodiment of the present invention;

[0052] Figure 3 A flow chart of another method for controlling duct surge in a dust removal system provided by an embodiment of the present invention;

[0053] Figure 4 A flow chart of another method for controlling duct surge of a dust removal system provided by an embodiment of the present invention;

[0054] Figure 5 A flow chart of another method for controlling duct surge of a dust removal system provided by an embodiment of the present invention;

[0055] Figure 6 A flow chart of another method for controlling duct surge of a dust removal system provided by an embodiment of the present invention;

[0056] Figure 7 for Figure 6 A flow chart of the surge strategy in the duct surge control method of the dust removal system is shown. DETAILED DESCRIPTION

[0057] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention are shown in the accompanying drawings, rather than all structures.

[0058] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. It should be noted that the "upper", "lower", "left" and "right" directional words described in the embodiments of the present invention are described at the angles shown in the accompanying drawings and should not be understood as limitations on the embodiments of the present invention. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is formed "on" or "under" another element, it can not only be directly formed "on" or "under" another element, but also indirectly formed "on" or "under" another element through an intermediate element. The terms "first" and "second" are used for descriptive purposes only and do not indicate any order, quantity or importance, but are only used to distinguish different components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention are understood in specific circumstances.

[0059] The term “including” and its variations used in the present invention are open inclusions, that is, “including but not limited to.” The term “based on” means “based at least in part on.” The term “one embodiment” means “at least one embodiment.”

[0060] It should be noted that the concepts of “first” and “second” mentioned in the present invention are only used to distinguish the corresponding contents, and are not used to limit the order or interdependence.

[0061] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0062] Figure 1 is a schematic diagram of a dust removal system air duct surge control system provided by an embodiment of the present invention, such as Figure 1 As shown, the system includes at least one air duct 10; the control system includes a main controller 20 and at least one control subsystem 30, the control subsystem 30 includes an IO substation 31, a wind pressure sensor 32 and an air supply valve 33; the main controller is communicatively connected with the IO substations of each control subsystem, the IO substations are electrically connected with the wind pressure sensor 32 and the air supply valve 33 respectively, the wind pressure sensor 32 is arranged at the air inlet of the corresponding air duct 10, and the air supply valve 33 is arranged on the side wall of the corresponding air duct 10;

[0063] The wind pressure sensor 32 is used to collect the wind pressure at the air inlet of the air duct 10;

[0064] The air supply valve 33 is used to supply air to the air duct 10;

[0065] The IO substation 31 is used to obtain the wind pressure at the air inlet of the air duct 10 collected by the wind pressure sensor 32 and transmit it to the main controller 20;

[0066] The main controller 20 is used to determine whether the corresponding air duct 10 is in a surge state based on the wind pressure at the air inlet of the air duct 10, and when the air duct 10 is in the surge state, control the air supply valve 33 to supply air to the air duct 10 to adjust the exhaust volume of the air duct 10.

[0067] Among them, the air duct 10 can be understood as the air duct in the dust removal system, whose air inlet is connected to the area to be dust removed, and the air outlet is connected to the fan 11; the main controller 20 can be understood as the remote master control terminal, which is used to receive the information transmitted by the subsystem 30 to analyze whether the subsystem 30 has a surge phenomenon; correspondingly, each air duct 10 in the dust removal system is equipped with an IO substation 31, and the IO substation 31 is used to collect information from the connected equipment (wind pressure sensor 32 and air supply valve 33), and transmit the control instructions of the main controller 20 to the connected equipment; the air supply valve 33 can be understood as a valve that can be opened and closed, and adjusting the opening and closing of the air supply valve 33 can affect the air intake of the air duct 10; the surge state can be understood as when the air intake of the air duct 10 is less than the actual air intake of the fan 11, the air flow separates from the air duct wall to form a negative pressure, resulting in a sharp fluctuation in the internal pressure of the air duct 10.

[0068] Specifically, the dust removal system air duct surge control system includes a main controller 20, and the main controller 20 is connected to at least one subsystem 30. The subsystem 30 obtains the air pressure at the air inlet of the air duct 10 through the air pressure sensor 32, and then transmits the air pressure data to the main controller 20 through the IO substation 31. When the main controller 20 detects that the wind pressure data fluctuates abnormally and surges, the main controller 20 sends a corresponding air supply instruction to the air supply valve 33 through the IO substation 31, and controls the opening and closing of the air supply valve 33 to adjust the actual air intake in the air duct 10.

[0069] Optionally, the control subsystem 30 further includes a wind speed sensor 34, which is disposed at the air inlet of the corresponding air duct 10, and the wind speed sensor 34 is electrically connected to the IO substation 31;

[0070] The IO substation 31 is used to obtain the wind speed at the air inlet of the air duct 10 collected by the wind speed sensor 34 and transmit it to the main controller 20;

[0071] The main controller 20 is also used to control the opening of the air supply valve 33 according to the wind speed at the air inlet of the air duct 10 when the air duct 10 is in a surge state, so as to adjust the amount of supply air to the air duct 10.

[0072] The opening of the air supply valve 33 can be understood as the degree of opening of the air supply valve 33. For example, if the opening of the air supply valve 33 is 0 degrees when it is fully closed and 90 degrees when it is fully opened, the opening of the air supply valve 33 is 0% when it is fully closed and 100% when it is fully opened, and the opening of 45 degrees corresponds to 50%.

[0073] Specifically, when the air duct 10 is in a surge state, after the main controller 20 receives the wind speed information at the air inlet of the air duct 10 transmitted from the IO substation 31 and collected by the wind speed sensor 34, it will adjust the opening of the air supply valve 33 accordingly according to a pre-set control strategy.

[0074] Optionally, the dust removal system further includes at least one fan 11 and at least one frequency converter 12 arranged corresponding to the air duct 10;

[0075] The fan 11 is arranged at the end of the air duct 10; the frequency converter 12 is electrically connected to the IO substation 31 and the fan 11 respectively;

[0076] The main controller 20 is also used to send a control command to the IO substation 31. The IO substation 31 controls the inverter 12 to drive the fan 11 to operate at a target speed based on the received control command, and when the fan 11 is in a surge state, reduces the power supply frequency of the inverter 12 to drive the fan 11 so that the fan 11 operates at an operating speed lower than the target speed.

[0077] Specifically, during the operation of the dust removal system, the main controller 20 sends a control command to the IO substation 31 according to the overall operation requirements of the system or the preset operation mode, and the command contains the target speed information that the fan 11 needs to reach. After receiving this command, the IO substation 31 passes the corresponding instructions to the frequency converter 12, and the frequency converter 12 adjusts the power parameters output to the fan 11 according to these instructions, thereby driving the fan 11 to operate stably according to the target speed to ensure that there is a suitable air flow speed and air volume in the air duct 10, and to achieve effective dust removal operations. On this basis, during the operation of the dust removal system, due to the uncertainty of the opening and closing state of the valves in the dust removal area corresponding to the air duct 10, when some valves are closed, the air intake of the air duct 10 will be reduced accordingly, and the maximum wind pressure that the dust removal area can withstand without causing surge will also change accordingly. Therefore, when the fan 11 is in a surge state, the unstable state of the air flow in the air duct 10 is alleviated by reducing the speed of the fan 11, and the surge phenomenon is reduced or even eliminated. When the fan 11 returns to a relatively stable operating state, the speed of the fan 11 is increased to ensure continuous and safe operation of the dust removal system and reduce the possibility of faults such as wear of the fan 11 impeller and damage to the bearings due to surge.

[0078] Optionally, the control system further includes a human-computer interaction terminal, which is electrically connected to the main controller 20;

[0079] The main controller 20 is also used to control the human-computer interaction terminal to display the working status of all the air ducts 10;

[0080] When any air duct 10 is in a surge state, the human-machine interaction terminal is controlled to display a surge alarm signal.

[0081] The human-computer interaction terminal can be understood as an interaction device having an input module and a display module.

[0082] Specifically, the input module in the human-computer interaction terminal is used to manually adjust the adjustable parameters in the dust removal system air duct surge control system, and the display module displays the working status (air intake volume, air pressure, whether it is surging, etc.) of all air ducts 10. On this basis, when any air duct 10 is in a surge state, the human-computer interaction terminal displays a surge alarm signal, including but not limited to an image or sound signal, to remind the staff of the working status of the air duct 10, and remind the staff to adjust the system parameters or arrange manual maintenance tasks.

[0083] The dust removal system duct surge control system provided in the embodiment of the present invention cleans dust in the target area by setting at least one air duct; the control system includes a main controller and at least one control subsystem, the control subsystem includes an IO substation, an air pressure sensor and an air supply valve, each sub-control system corresponds to an air duct, and remotely analyzes the state of the air duct corresponding to the control subsystem; the main controller is communicatively connected with the IO substation of each control subsystem, and the IO substation is electrically connected with the wind pressure sensor and the air supply valve respectively, the wind pressure sensor is set at the air inlet of the corresponding air duct, and the air supply valve is set on the side wall of the corresponding air duct; the wind pressure sensor is used to collect the wind pressure at the air inlet of the air duct; the air supply valve is used to supply air to the air duct, and the wind pressure data at the key position of the air duct can be directly obtained by the wind pressure sensor set at the inlet of the air duct, based on which it is judged whether the air duct is in a surge state. The IO substation is used to obtain the wind pressure at the air inlet of the air duct collected by the wind pressure sensor, and transmit it to the main controller for data transmission and control through the main controller and the IO substation, which simplifies the equipment structure and reduces the complexity of the system; the main controller is used to determine whether the corresponding air duct is in a surge state according to the wind pressure at the air inlet of the air duct, and when the air duct is in a surge state, control the air supply valve to supply air to the air duct to adjust the exhaust volume of the air duct, thereby ensuring the continuous and safe operation of the dust removal system, and quickly determine whether the air duct is in a surge state when surge occurs, and promptly eliminate or reduce the impact of surge based on the surge strategy.

[0084] Figure 2 1 is a flow chart of a dust removal system air duct surge control method provided by an embodiment of the present invention. The above control method is applicable to the dust removal system air duct surge control system shown in 1. Figure 2As shown, the method includes:

[0085] S110. Collect the wind pressure at the air inlet of the air duct through a wind pressure sensor.

[0086] Specifically, during the operation of the dust removal system, the wind pressure sensor configured at the air inlet of each air duct detects and collects data on the wind pressure at that location in real time. The wind pressure sensor obtains the wind pressure value information at the air inlet of the air duct, and then transmits the collected wind pressure data to the main controller through the IO substation.

[0087] S120. Determine, based on the wind pressure at the air inlet of the air duct, whether the corresponding air duct is in a surge state.

[0088] Specifically, after receiving the wind pressure data at the air inlet of the air duct transmitted by the IO substation and collected by the wind pressure sensor, the main controller performs analysis and judgment according to a pre-set surge judgment algorithm.

[0089] Exemplarily, the dust removal system stores upper and lower thresholds corresponding to a reasonable fluctuation range of wind pressure at the air duct inlet under normal operating conditions. When the received wind pressure data exceeds the upper and lower thresholds corresponding to the fluctuation range, it is determined that the corresponding air duct has entered a surge state.

[0090] S130. When the air duct is in a surging state, control the air supply valve to supply air to the air duct to adjust the exhaust volume of the air duct.

[0091] Specifically, when the main controller determines that a certain air duct is in a surge state, the main controller will generate an air supply control instruction according to the preset control strategy, and send the instruction to the air supply valve through the IO substation in the control subsystem corresponding to the air duct. After receiving the air supply control instruction, the air supply valve adjusts the valve opening through the air supply valve drive device, and then adjusts the air intake in the air duct, so that the air flow state inside the air duct tends to be stable again, reducing or eliminating the surge phenomenon.

[0092] The embodiment of the present invention collects the wind pressure at the air inlet of the air duct through the wind pressure sensor and then transmits the collected wind pressure data to the main controller through the IO substation. The main controller determines that the corresponding air duct is in a surge state according to the wind pressure at the air inlet of the air duct. When the air duct is in a surge state, the air supply valve is controlled to supply air to the air duct to adjust the exhaust volume of the air duct, so that the air flow state inside the air duct tends to be stable again, reducing or eliminating the surge phenomenon.

[0093] Optional, such as Figure 1 The dust removal system shown also includes at least one fan 11 and at least one frequency converter 12 arranged corresponding to the air duct 10; the fan 11 is arranged at the air inlet of the air duct 10; the frequency converter 12 is electrically connected to the IO substation 21 and the fan 11 respectively;

[0094] The duct surge control method also includes:

[0095] S131. The main controller sends a control command to the IO substation, and the IO substation controls the inverter to drive the fan to operate at a target speed according to the received control command.

[0096] Specifically, during the operation of the dust removal system, the main controller determines the target speed that the fan needs to reach according to the requirements of the dust removal task. The main controller generates a speed control command containing the target speed information and sends the speed control command to the corresponding IO substation. After receiving the command, the IO substation controls the inverter to adjust the fan output frequency to ensure that the duct output meets the dust removal operation requirements under different working conditions.

[0097] S132. When the fan is in a surge state, the power supply frequency of the inverter driving the fan is reduced so that the fan operates at a speed lower than the target speed.

[0098] Specifically, when the main controller determines that the fan is in a surge state for a long time, the main controller obtains the target wind speed of the fan, generates a wind speed reduction instruction according to the control strategy, and sends the wind speed reduction instruction to the inverter through the IO substation. After receiving the wind speed reduction instruction, the IO substation controls the inverter to reduce the output frequency, thereby reducing the fan speed, so that the airflow pressure in the air duct gradually stabilizes, reducing or even eliminating the surge phenomenon. When the fan returns to a relatively stable operating state, the main controller can adjust the power supply frequency of the inverter again, increase the fan speed, and return to normal operating conditions to ensure the continuous and safe operation of the dust removal system.

[0099] Figure 3 A flowchart of another method for controlling surging of an air duct of a dust removal system provided by an embodiment of the present invention. The embodiment of the present invention refines or optimizes the above embodiment. Specifically, "S110, collecting the wind pressure at the air inlet of the air duct through a wind pressure sensor" in the above embodiment is refined, which can be specifically refined as follows:

[0100] The wind pressure at the air inlet of the air duct is periodically collected at a first time interval by means of a wind pressure sensor.

[0101] Correspondingly, S120, judging, based on the wind pressure at the air inlet of the air duct, whether the corresponding air duct is in a surge state, includes:

[0102] When the difference between the wind pressure at the air inlet of the air duct currently collected and the wind pressure at the air inlet of the air duct collected last time is greater than the first difference threshold, it is determined to be a fluctuation and counted;

[0103] Periodically counting the number of fluctuations in a second time interval; the second time interval has at least one first time interval;

[0104] When the number of fluctuations in the second time interval is greater than the first number threshold, it is determined that the corresponding air duct is in a surge state.

[0105] like Figure 3 As shown, the method may specifically include the following steps:

[0106] S210. Periodically collect the wind pressure at the air inlet of the air duct at a first time interval using a wind pressure sensor.

[0107] Specifically, during the operation of the dust removal system, according to a preset first time interval (eg, 1 second, 2 seconds), a wind pressure sensor disposed at the air inlet of the air duct will regularly collect wind pressure at the air inlet of the air duct according to the first time interval.

[0108] S220: When the difference between the wind pressure at the air inlet of the air duct currently collected and the wind pressure at the air inlet of the air duct collected last time is greater than a first difference threshold, it is determined to be a fluctuation and counted.

[0109] Specifically, the main controller obtains wind pressure data collected by the wind pressure sensor and calculates the difference between the current wind pressure P1 and the wind pressure P0 before the first time interval. When |P1-P0| is greater than the first difference threshold (such as 800Pa), it is determined that a fluctuation has occurred in the air duct and a corresponding fluctuation is recorded.

[0110] S230. Periodically count the number of fluctuations in a second time interval; the second time interval has at least one first time interval.

[0111] Specifically, the main controller is further provided with a second time interval (eg, 1 minute, 2 minutes, etc., and the second time interval is greater than the first time interval). The main controller uses the second time interval as a statistical cycle and counts the number of fluctuations within the second time interval.

[0112] S240: When the number of fluctuations in the second time interval is greater than the first number threshold, determine that the corresponding air duct is in a surge state.

[0113] Specifically, the main controller uses the second time interval as the statistical period, and counts the number of fluctuations in the second time interval. When the number of fluctuations in a second time interval exceeds the first number threshold (such as 10 times), it indicates that the fluctuation of the wind pressure in the second time interval exceeds the reasonable fluctuation range under normal operating conditions, and the corresponding air duct can be determined to be in a surge state. For example, in a statistical period in which the second time interval is 1 minute, the first time interval is 2 seconds, and it is determined every two seconds whether a fluctuation occurs. If a fluctuation occurs, the counter executes a +1 instruction (initial value is 0). If the number of fluctuations detected by the main controller is greater than 10 times (the counter value is greater than 10), the main controller determines that the corresponding air duct is in a surge state.

[0114] S250. When the air duct is in a surging state, the air supply valve is controlled to supply air to the air duct to adjust the exhaust volume of the air duct.

[0115] The embodiment of the present invention determines whether surge occurs in the air duct by setting a time interval and a number of fluctuations, thereby avoiding misjudging surge due to short-term fluctuations, thereby more accurately and timely discovering the surge phenomenon in the corresponding air duct.

[0116] Figure 4 A flowchart of another method for controlling surging of a duct of a dust removal system provided in an embodiment of the present invention is provided. The embodiment of the present invention refines or optimizes the above embodiment. Specifically, the above embodiment "S110, collecting the wind pressure at the air inlet of the duct through a wind pressure sensor." is refined, which can be specifically refined as follows:

[0117] The wind pressure sensor collects and records the wind pressure at the air inlet of the air duct in real time

[0118] Correspondingly, S120, judging, based on the wind pressure at the air inlet of the air duct, whether the corresponding air duct is in a surge state, includes:

[0119] Determine the maximum and minimum wind pressures at the air inlet of the air duct within a first time interval from the current moment to the present moment, calculate the pressure difference between the maximum and minimum wind pressures at the air inlet of the air duct, and if the pressure difference is greater than the first pressure difference, determine it as a fluctuation and count it;

[0120] After each fluctuation determination, the number of fluctuations in a second time interval from the current moment to the present moment is counted; the second time interval has at least one first time interval;

[0121] When the number of fluctuations in the second time interval is greater than the first number threshold, it is determined that the corresponding air duct is in a surge state.

[0122] like Figure 4 As shown, the method may specifically include the following steps:

[0123] S310, collecting and recording the wind pressure at the air inlet of the air duct in real time through the wind pressure sensor.

[0124] Specifically, during the operation of the dust removal system, the wind pressure at the air inlet of the air duct is continuously collected at a smaller time interval than the first time interval.

[0125] S320, determining the maximum and minimum wind pressures at the air inlet of the air duct within a first time interval from the current moment to the present moment, calculating the pressure difference between the maximum and minimum wind pressures at the air inlet of the air duct, and if the pressure difference is greater than the first pressure difference, determining it as a fluctuation and counting it.

[0126] Specifically, the main controller obtains multiple wind pressure data collected by the wind pressure sensor within the first time interval, selects the maximum and minimum wind pressure values ​​(such as the maximum value P_max and the minimum value P_min) within the time period, and calculates the difference between the maximum value P_max and the minimum value P_min. When |P_max-P_min| is greater than the first difference threshold (such as 800Pa), it is determined that a fluctuation has occurred in the air duct, and a corresponding fluctuation is recorded.

[0127] S330. After each fluctuation determination, count the number of fluctuations in a second time interval from the current moment forward; the second time interval has at least one first time interval.

[0128] Specifically, after each fluctuation determination, the main controller counts the number of fluctuations in the second time interval from the current moment. For example, after a fluctuation determination, the main controller counts the number of fluctuations in the second time interval (such as 1 minute) from the current moment, and determines whether a fluctuation occurs every first time interval (such as 2 seconds). If a fluctuation occurs, the counter executes a +1 instruction (initial value is 0).

[0129] S340: When the number of fluctuations in the second time interval is greater than the first number threshold, determine that the corresponding air duct is in a surge state.

[0130] S350: When the air duct is in a surging state, the air supply valve is controlled to supply air to the air duct to adjust the exhaust volume of the air duct.

[0131] The embodiment of the present invention further refines the conditions for fluctuation judgment by finding the maximum and minimum values ​​of the air pressure in a preset time interval, thereby more accurately and timely discovering the surge phenomenon in the corresponding air duct.

[0132] Figure 5 A flow chart of another duct surge control method for a dust removal system provided in an embodiment of the present invention is a refinement or optimization of the above embodiment. Specifically, the control subsystem further includes a wind speed sensor, which is arranged at the air inlet of the corresponding air duct, and the wind speed sensor is electrically connected to the IO substation. The corresponding duct surge control method also includes: obtaining the wind speed at the air inlet of the air duct collected by the wind speed sensor.

[0133] Correspondingly, S130, when the air duct is in a surge state, controlling the air supply valve to supply air to the air duct to adjust the exhaust volume of the air duct, including:

[0134] When the fan is in a surge state, the opening of the air supply valve is controlled according to the wind speed at the air inlet of the air duct.

[0135] like Figure 5 As shown, the method may specifically include the following steps:

[0136] S410. Collect the wind pressure at the air inlet of the air duct through a wind pressure sensor.

[0137] S420: Obtain the wind speed at the air inlet of the air duct collected by the wind speed sensor.

[0138] Specifically, a wind speed sensor (such as an anemometer) is installed at the air inlet of the air duct to detect the air flow rate at the air inlet of the air duct in real time. The main controller receives the wind speed data at the air inlet of the air duct transmitted by the wind pressure sensor through the IO substation and calculates the actual air intake volume.

[0139] S430: Determine, based on the wind pressure at the air inlet of the air duct, whether the corresponding air duct is in a surge state.

[0140] S440. When the fan is in a surge state, the opening of the air supply valve is controlled according to the wind speed at the air inlet of the air duct.

[0141] Specifically, when the main controller determines that a certain air duct is in a surge state, the main controller obtains the real-time wind speed at the air inlet of the air duct collected by the wind speed sensor. The main controller generates a supplementary air control instruction based on the relationship between the real-time wind speed and the preset wind speed, and sends the instruction to the supplementary air valve through the IO substation in the control subsystem corresponding to the air duct. After receiving the supplementary air control instruction, the supplementary air valve adjusts the opening size of the valve through the supplementary air valve drive device, and then adjusts the air intake in the air duct, so that the air flow state inside the air duct tends to be stable again, reducing or eliminating the surge phenomenon. Exemplarily, when the real-time wind speed is much smaller than the preset fan, in order to quickly increase the air intake, the opening of the supplementary air valve should be adjusted to 100%, and then continue to adjust according to the real-time wind speed. On the contrary, if the real-time wind speed is at a relatively high level compared to the preset wind speed, the adjustment range of the supplementary air valve opening is smaller.

[0142] Optionally, when the fan is in a surge state, the opening of the air supply valve is controlled according to the wind speed at the air inlet of the air duct, including:

[0143] When the fan is in the surging state, the main controller confirms the preset air volume required for the current work demand according to the current dust removal task, and the main controller calculates the actual air intake volume according to the wind speed at the air inlet obtained by the wind speed sensor;

[0144] According to the formula: the opening variation of the supply air valve = (preset air volume - actual air volume) * supply air valve coefficient, the opening of the supply air valve is controlled; among which, the supply air valve coefficient is determined by the air duct parameters.

[0145] Among them, the air supply valve coefficient can be understood as a parameter that is affected by the duct parameters (such as the length, diameter, roughness and number of bends of the duct), and the effect of adjusting the opening of the air supply valve on the air volume replenishment effect; the air supply valve coefficient needs to be determined comprehensively through experiments, simulations and past operating experience.

[0146] Specifically, when the fan is in a surging state, the main controller must first confirm the preset air volume required for the current work demand according to the current dust removal task. Different dust removal scenarios, production processes, and the nature of the dust to be processed will affect the required air volume. For example, if the dust particles to be processed are fine and the concentration is high, in order to ensure a good dust removal effect, a relatively large air volume is required to ensure that the dust can be effectively carried and collected; while for large dust particles and low concentrations, the preset air volume is relatively small. Then, the main controller obtains the real-time wind speed information at the air inlet of the air duct to calculate the actual air intake. For example, the relationship between the actual air intake and the wind speed and the cross-sectional area of ​​the air duct is as follows: actual air intake = wind speed * cross-sectional area of ​​the air duct. Finally, according to the formula: the opening change range of the air supply valve = (preset air volume-actual air volume) * air supply valve coefficient, the opening of the air supply valve is controlled. Exemplarily, when the fan is in a surge state, the main controller will first substitute the preset air volume and the calculated actual air volume into the above formula to calculate the value of the opening change amplitude of the air supply valve. If the difference of (preset air volume-actual air volume) is a positive value, it means that the current actual air intake is less than the preset demand, then it is necessary to increase the opening of the air supply valve to make the opening change amplitude positive, so that more outside air can be added to the air intake duct to increase the actual air intake volume, so that it is close to the preset air volume, and alleviate the surge phenomenon caused by insufficient air volume; on the contrary, if the difference is negative, it means that the actual air intake exceeds the preset amount, and it may be necessary to appropriately reduce the opening of the air supply valve to make the opening change amplitude negative, reduce the additional air intake, and let the air volume in the air duct return to a reasonable range, thereby adjusting the exhaust volume of the air duct, prompting the airflow state in the air duct to gradually stabilize, and reduce or even eliminate the surge phenomenon. Ensure that the dust removal system returns to a stable operating state as soon as possible, minimize the adverse effects of surge on the system, extend the service life of the equipment, and improve the reliability and efficiency of the entire dust removal system.

[0147] The embodiment of the present invention obtains the real-time wind speed by setting a wind speed sensor at the air inlet of the air duct, and obtains the actual condition of the air flow in the air duct in a more comprehensive manner. Then, the opening and closing degree of the air supply valve is determined according to the real-time wind speed, which can better match the air flow demand in the air duct, reduce the impact after the surge occurs, quickly and accurately eliminate the surge phenomenon, and ensure the continuous, safe and efficient operation of the dust removal system.

[0148] Figure 6 A flowchart of another method for controlling duct surge of a dust removal system provided by an embodiment of the present invention, Figure 7 for Figure 6 The flowchart of the surge strategy in the duct surge control method of the dust removal system is shown. Figure 6 and Figure 7 ,like Figure 6As shown, the embodiment of the present invention is optimized on the basis of the above scheme, and the control method includes the following specific steps:

[0149] S510: Program initialization.

[0150] After this step is completed, step S520 is executed.

[0151] S520, wind pressure data collection.

[0152] After this step is completed, step S530 is executed.

[0153] S530: Execute the surge strategy.

[0154] After this step is completed, step S540 is executed.

[0155] S540. Determine whether there is surge?

[0156] If yes, execute step S550; if no, execute step S520.

[0157] S550: Output a warning signal.

[0158] The embodiment of the present invention first collects the wind pressure at the air inlet of the air duct after initialization, and then determines whether the air duct is in a surge state through a surge strategy. When the air duct is in a surge state, an early warning signal is sent to the system, so that the system or the staff can know the system abnormality in the first time and take corresponding countermeasures in time.

[0159] like Figure 7 As shown, the embodiment of the present invention optimizes step S530 and executes the surge strategy based on the above solution, which specifically includes the following specific steps:

[0160] S610: Program initialization.

[0161] After this step is completed, step S620 is executed.

[0162] S620, reading the wind pressure value every 2 seconds.

[0163] After this step is completed, step S630 is executed.

[0164] S630: Calculate the difference between the current wind pressure value and the wind pressure value obtained last time.

[0165] After this step is completed, step S640 is executed.

[0166] S640. Determine whether the wind pressure difference is greater than 800Pa?

[0167] If yes, execute step S650.

[0168] S650: Start the fluctuation timer.

[0169] After this step is completed, step S660 is executed.

[0170] S660, start the fluctuation counter and add one.

[0171] After this step is completed, step S670 is executed.

[0172] S670: Determine whether the fluctuation timer time is greater than 30 seconds?

[0173] If yes, execute step S680; if no, execute step S620.

[0174] S680. Determine whether the fluctuation counter value is greater than or equal to 10?

[0175] If yes, execute step S690; if no, execute step S681.

[0176] S681. Reset the fluctuation timer to zero.

[0177] After this step is completed, step S682 is executed.

[0178] S682. Reset the fluctuation counter to zero.

[0179] After this step is completed, step S620 is executed.

[0180] S690, output surge signal.

[0181] The embodiment of the present invention obtains the wind pressure value every 2 seconds and calculates the difference to monitor the wind pressure change and timely capture the wind pressure fluctuation. The fluctuation timer and fluctuation counter are set and combined with the specific time and number threshold judgment, which effectively filters out the misjudgment caused by short-term and non-continuous wind pressure fluctuations. It avoids unnecessary equipment inspections and shutdown operations caused by false alarms, ensures the continuity and stability of the dust removal system, reduces the risk of production interruption, and thus improves production efficiency.

[0182] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, but also includes more effective embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A dust removal system duct surge control system, characterized in that: The dust removal system includes at least one air duct; the control system includes a main controller and at least one control subsystem, and the control subsystem includes an IO substation, a wind pressure sensor and an air supply valve; The main controller is communicatively connected with the IO substations of each control subsystem, and the IO substations are electrically connected with the wind pressure sensor and the air supply valve, respectively. The wind pressure sensor is arranged at the air inlet of the corresponding air duct, and the air supply valve is arranged on the side wall of the corresponding air duct; The wind pressure sensor is used to collect the wind pressure at the air inlet of the air duct; The air supply valve is used to supply air to the air duct; The IO substation is used to obtain the wind pressure at the air inlet of the air duct collected by the wind pressure sensor and transmit it to the main controller; The main controller is used to determine whether the corresponding air duct is in a surge state based on the wind pressure at the air inlet of the air duct, and when the air duct is in the surge state, control the air supply valve to supply air to the air duct to adjust the exhaust volume of the air duct.

2. The control system according to claim 1, characterized in that: The control subsystem further includes a wind speed sensor, which is disposed at the air inlet of the corresponding air duct and is electrically connected to the IO substation; The IO substation is used to obtain the wind speed at the air inlet of the air duct collected by the wind speed sensor and transmit it to the main controller; The main controller is also used to control the opening of the air supply valve according to the wind speed at the air inlet of the air duct when the air duct is in a surge state, so as to adjust the amount of supply air to the air duct.

3. The control system according to claim 1, characterized in that: The dust removal system further includes at least one fan and at least one frequency converter arranged corresponding to the air duct; The fan is arranged at the end of the air duct; the frequency converter is electrically connected to the IO substation and the fan respectively; The main controller is also used to send a control command to the IO substation, and the IO substation controls the frequency converter to drive the fan to operate at a target speed based on the received control command, and when the fan is in a surge state, reduces the power supply frequency of the frequency converter to drive the fan, so that the fan operates at a speed lower than the target speed.

4. The control system according to claim 1, characterized in that: The control system further comprises a human-computer interaction terminal, which is electrically connected to the main controller; The main controller is also used to control the human-computer interaction terminal to display the working status of all the air ducts; When any of the air ducts is in a surge state, the human-computer interaction terminal is controlled to display a surge alarm signal.

5. A method for controlling duct surge in a dust removal system, characterized in that: Applied to the dust removal system duct surge control system according to any one of claims 1 to 4, the control method comprises: The wind pressure at the air inlet of the air duct is collected by the wind pressure sensor; According to the wind pressure at the air inlet of the air duct, determining whether the corresponding air duct is in a surge state; When the air duct is in a surge state, the air supply valve is controlled to supply air to the air duct to adjust the exhaust volume of the air duct.

6. The control method according to claim 5, characterized in that: The wind pressure at the air inlet of the air duct is collected by the wind pressure sensor, including: The wind pressure sensor periodically collects the wind pressure at the air inlet of the air duct at a first time interval; Judging, according to the wind pressure at the air inlet of the air duct, that the corresponding air duct is in a surge state includes: When the difference between the wind pressure at the air inlet of the air duct currently collected and the wind pressure at the air inlet of the air duct collected last time is greater than a first difference threshold, it is determined to be a fluctuation and counted; Periodically counting the number of fluctuations in a second time interval; the second time interval has at least one of the first time intervals; When the number of fluctuations in the second time interval is greater than the first number threshold, it is determined that the corresponding air duct is in a surge state.

7. The control method according to claim 5, characterized in that: The wind pressure at the air inlet of the air duct is collected by the wind pressure sensor, including: The wind pressure sensor is used to collect and record the wind pressure at the air inlet of the air duct in real time; Judging, according to the wind pressure at the air inlet of the air duct, that the corresponding air duct is in a surge state includes: Determine the maximum and minimum wind pressures at the air inlet of the air duct within a first time interval from the current moment to the present moment, calculate the pressure difference between the maximum and minimum wind pressures at the air inlet of the air duct, and if the pressure difference is greater than the first pressure difference, determine it as a fluctuation and count it; After each fluctuation determination, the number of fluctuations in a second time interval from the current moment to the present moment is counted; the second time interval has at least one of the first time intervals; When the number of fluctuations in the second time interval is greater than the first number threshold, it is determined that the corresponding air duct is in a surge state.

8. The control method according to claim 5, characterized in that: The control subsystem further includes a wind speed sensor, which is disposed at the air inlet of the corresponding air duct and is electrically connected to the IO substation; The duct surge control method further includes: Obtaining the wind speed at the air inlet of the air duct collected by the wind speed sensor; When the air duct is in a surge state, controlling the air supply valve to supply air to the air duct to adjust the exhaust volume of the air duct includes: When the fan is in a surging state, the opening of the air supply valve is controlled according to the wind speed at the air inlet of the air duct.

9. The control method according to claim 8, characterized in that: When the fan is in a surging state, the opening of the air supply valve is controlled according to the wind speed at the air inlet of the air duct, including: When the fan is in the surging state, the main controller confirms the preset air volume required for the current work demand according to the current dust removal task, and the main controller calculates the actual air intake volume according to the wind speed at the air inlet obtained by the wind speed sensor; According to the formula: the opening variation of the supply air valve = (preset air volume - actual air volume) * supply air valve coefficient, the opening of the supply air valve is controlled; among which, the supply air valve coefficient is determined by the air duct parameters.

10. The control method according to claim 5, characterized in that: The dust removal system further includes at least one fan and at least one frequency converter arranged corresponding to the air duct; the fan is arranged at the air inlet of the air duct; The frequency converter is electrically connected to the IO substation and the fan respectively; The duct surge control method further includes: The main controller sends a control command to the IO substation, and the IO substation controls the frequency converter to drive the fan to operate at a target speed according to the received control command; When the fan is in a surge state, the power supply frequency of the frequency converter driving the fan is reduced so that the fan operates at a rotation speed lower than the target rotation speed.

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