Safety control method and device for air blower

Abstract

The embodiment of the application provides a kind of safety control method and device for air blower, it is related to the logical control solution of the fault of air blower equipment and other technical fields.Its method includes: obtaining the real-time parameter of air blower, and the real-time parameter is preprocessed to obtain the first parameter;The first parameter is subjected to graph number conversion processing to determine the position of real-time working condition point in the preset energy graph;According to the position of real-time working condition point in the preset energy graph, the working field of real-time working condition point is determined;According to the working field of real-time working condition point, control strategy is determined, and target operation is executed based on control strategy, to make real-time working condition point continuously operate in preset safe area.Through the application, the problem that air blower safety control is complex and too dependent on single key equipment is solved, and the effect of improving air blower safety control efficiency and reducing safety control difficulty is achieved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of logic control solutions for equipment failures in blowers and related technologies, specifically to a safety control method and device for blowers. Background Technology

[0002] Blowers are an indispensable and crucial component in blast furnace production, and ensuring their safe and stable operation is a fundamental condition for smooth blast furnace production. For surge control of axial blowers, the most widely used controller on the market is currently the TURBOLOG controller. This controller boasts high reliability, fast execution speed, and a response time of up to 1ms, making it particularly suitable for surge protection of axial blowers.

[0003] However, due to the lack of spare parts for this controller and its high price, as well as the long procurement cycle, it is impossible to effectively replace and maintain the controller when it malfunctions. There is an urgent need for an alternative solution to achieve safe control of the blower.

[0004] There is currently no good solution to the above problems. Summary of the Invention

[0005] This invention provides a safety control method and device for blowers, which at least solves the problems of complex safety control of blowers in related technologies.

[0006] According to an embodiment of the present invention, a safety control method for a blower is provided, comprising:

[0007] The real-time parameters of the blower are obtained and the real-time parameters are preprocessed to obtain the first parameter, wherein the preprocessing includes at least temperature and pressure compensation processing.

[0008] The first parameter is subjected to graph-to-digital conversion to determine the position of the real-time operating point in the preset energy map;

[0009] The working area of ​​the real-time operating point is determined based on its position in the preset energy map.

[0010] Based on the working area of ​​the real-time operating point, a control strategy is determined, and a target operation is executed based on the control strategy to ensure that the real-time operating point continues to operate within a preset safe area.

[0011] In an exemplary embodiment, determining a control strategy based on the working area of ​​the real-time operating point and executing a target operation based on the control strategy includes at least one of the following:

[0012] In the case that the real-time working condition point changes to the first boundary line, the first valve is controlled to open to a first angle, so that the real-time working condition point returns to the safe region, and a first alarm processing is performed, wherein the energy diagram comprises the first boundary line;

[0013] Or,

[0014] In the case that the real-time working condition point changes between the first boundary line and the second boundary line, the first valve is controlled to open to a second angle, the second angle being greater than the first angle, and a second alarm processing is performed, wherein the energy diagram comprises the second boundary line, and the second boundary line is outside the safe region;

[0015] Or,

[0016] In the case that the real-time working condition point changes to outside the second boundary line, the first valve is controlled to enter a full open state and a locking processing is performed on the first valve, and a third alarm processing is performed, wherein the region outside the second boundary line is far away from the safe region.

[0017] In an example embodiment, after the real-time parameter of the blower is acquired, the method further comprises:

[0018] Acquiring a target number of throat difference detection signals, wherein the throat difference detection signal is an analog signal;

[0019] In the case that the first number of throat difference values meets a preset reverse flow condition, a program delay protection operation is performed.

[0020] In an example embodiment, after the working field according to the real-time working condition point is determined, the control strategy is determined, and the target operation is performed based on the control strategy, the method further comprises:

[0021] Acquiring control value information when the target operation is performed, the control value information being obtained based on a PID control algorithm, and the control value information comprising a control output value;

[0022] Comparing the control output value in a preset unit period;

[0023] In the case that the control output value is determined to be in a first change state in the unit period, the control output value is transmitted to a final output end;

[0024] In the case that the control output value is determined to be in a second change state in the unit period, the output value after the decrement is transmitted to the final output end according to a preset decrement and a preset first period.

[0025] In an example embodiment, the method further comprises:

[0026] acquire motor operation signals and motor speed detection signals;

[0027] perform integral saturation elimination processing on the PID control algorithm according to the motor operation signals and / or motor speed detection signals.

[0028] According to another embodiment of the present application, a safety control device for a blower is provided, comprising:

[0029] a parameter acquisition module configured to acquire real-time parameters of the blower and pre-process the real-time parameters to obtain first parameters, wherein the pre-processing at least includes temperature and pressure compensation processing;

[0030] a node calculation module configured to perform graph number conversion processing on the first parameters to determine a position of a real-time working condition point in a preset energy graph;

[0031] a working field determination module configured to determine a working field of the real-time working condition point according to the position of the real-time working condition point in the preset energy graph;

[0032] a target operation module configured to determine a control strategy according to the working field of the real-time working condition point, and perform target operation based on the control strategy to enable the real-time working condition point to continuously operate in a preset safe region.

[0033] In one exemplary embodiment, the determination of the control strategy according to the working field of the real-time working condition point and the performance of the target operation based on the control strategy at least include any one of the following:

[0034] in the case where the real-time working condition point changes to a first boundary line, the first valve is controlled to open to a first angle to enable the real-time working condition point to return to the safe region and perform first alarm processing, wherein the energy graph includes the first boundary line;

[0035] or,

[0036] in the case where the real-time working condition point changes between a first boundary line and a second boundary line, the first valve is controlled to open to a second angle, the second angle being greater than the first angle, and second alarm processing is performed, wherein the energy graph includes the second boundary line, and the second boundary line is located outside the safe region;

[0037] or,

[0038] in the case where the real-time working condition point changes to outside the second boundary line, the first valve is controlled to enter a fully open state and the first valve is locked, and third alarm processing is performed, wherein the area outside the second boundary line is far away from the safe region.

[0039] In one exemplary embodiment, the device comprises:

[0040] a throat difference detection module, configured to acquire a target number of throat difference detection signals after acquiring the real-time parameters of the blower, wherein the throat difference detection signals are analog signals;

[0041] a reverse flow protection module, configured to perform a program delay protection operation when the throat difference values of the first number of channels meet a preset reverse flow condition.

[0042] According to still another embodiment of the present application, a computer readable storage medium is also provided, wherein the computer readable storage medium stores a computer program, and the computer program is configured to perform the steps in any of the above method embodiments when executed.

[0043] According to still another embodiment of the present application, an electronic device is also provided, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to perform the steps in any of the above method embodiments.

[0044] According to the present application, since the real-time working condition point is converted into a number by a preset function, the working field of the real-time working condition point is determined, and the corresponding target operation is performed based on the working field, the blower can be accurately and safely controlled, the problem of difficult blower safety control can be solved, and the safety control precision of the blower is improved and the control cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a hardware structure block diagram of a mobile terminal of a safety control method for a blower according to an embodiment of the present application;

[0046] Figure 2 is a working principle diagram of a specific embodiment of the present application;

[0047] Figure 3 is a flow chart of a safety control method for a blower according to an embodiment of the present application;

[0048] Figure 4 is a flow chart of performing a target operation according to a specific embodiment of the present application;

[0049] Figure 5 is a flow chart of performing a program reverse flow protection operation according to a specific embodiment of the present application;

[0050] Figure 6 is a structure block diagram of a safety control device for a blower according to an embodiment of the present application. DETAILED DESCRIPTION

[0051] Embodiments of the present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0052] It should be noted that the terms "first", "second" and the like in the description and claims of the application and above drawings are used to distinguish between similar objects, and do not necessarily have to describe a specific order or sequence.

[0053] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or similar computing device. Taking the case of running on a mobile terminal, Figure 1 is a hardware structure block diagram of a mobile terminal of a safety control method for a blower. As shown in Figure 1 , the mobile terminal can include one or more (only one is shown in Figure 1 ) processor 102 (the processor 102 can include but not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the above-mentioned mobile terminal can also include a transmission device 106 for communication function and an input and output device 108. Those skilled in the art can understand, Figure 1 The structure shown is only schematic, which does not limit the structure of the above-mentioned mobile terminal. For example, the mobile terminal can also include more or less components than Figure 1 shown, or have a different configuration from Figure 1 shown.

[0054] The memory 104 can be used to store computer programs, such as software programs of application software and modules, such as a computer program corresponding to a safety control method for a blower in the embodiments of the present application. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, implements the above-mentioned method. The memory 104 can include a high-speed random access memory, and can also include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 104 can further include a memory remotely arranged with respect to the processor 102, which can be connected to the mobile terminal through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network and a combination thereof.

[0055] The transmission device 106 is configured to receive or send data via a network. The network can include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network interface controller (NIC) that can be connected to other network devices through a base station to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module configured to communicate with the Internet through a wireless manner.

[0056] From Figure 2 It can be seen that the energy diagram of the present application includes an anti-surge curve diagram composed of a regulation line, a blow-off line, and several spaces divided by the regulation line and the blow-off line, wherein the area below the regulation line is a safe operation area, and under normal circumstances, the working condition point is operated in this area; the area above the regulation line and below the blow-off line is a regulation area, in which the unit regulation anti-surge valve opening degree is adjusted to avoid entering the surge state; the area above the blow-off line is a surge blow-off area, indicating that the unit is about to enter the surge state, and the situation is very critical, and the anti-surge valve must be immediately opened.

[0057] When the working condition point approaches or crosses the regulation line, the anti-surge valve is opened by a certain angle to pull the working condition point back to the vicinity of the regulation line; when the unit working condition is abnormal and the working condition point crosses the blow-off line, the unit immediately enters a safe operation state, the anti-surge valve is fully opened, the static blade is slowly fully closed and locked, and the working condition point is immediately pulled back to the safe area to avoid entering the surge state. The controller collects, analyzes, and calculates parameters such as the throat difference, the exhaust pressure, the inlet temperature, and the inlet pressure, and controls the opening degree of the anti-surge valve to ensure the normal operation of the unit.

[0058] It should be noted that when the unit is put into operation, a surge experiment will be performed, and through the experiment, a group of surge point data is obtained, and then the surge points are connected to form a line, and the line is moved downward by different proportions to obtain two lines, one blow-off line and one regulation line, and then the abscissa (compensated throat difference) and the ordinate (compensated exhaust pressure) are added to form an anti-surge curve diagram. The area below the regulation line is a safe area (the anti-surge valve is fully closed by default, and the operator manually opens and closes the valve according to the process requirement), the area between the regulation line and the blow-off line is a regulation area (the anti-surge valve is opened by a certain angle to pull the working condition point back to the safe area), and the area above the blow-off line is a blow-off area (the anti-surge valve is fully opened and locked);

[0059] After obtaining the first-hand real-time data (after temperature and pressure compensation), the point can be reflected on the anti-surge curve diagram, that is, the real-time working condition point coordinates (X throat difference, Y exhaust pressure);

[0060] For the control strategy, the ordinate of the operating point (exhaust pressure) and the ordinate of the point on the regulation line and the emptying line are compared under the same throat difference (i.e. the region where the operating point is located), and thus different forms of regulation are performed.

[0061] Specifically, in the embodiment, a safety control method for a blower is provided, Figure 3 is a flow chart of a safety control method for a blower according to an embodiment of the present application, as shown in the figure, the flow includes the following steps: Figure 3

[0062] In step S301, real-time parameters of the blower are acquired, and the real-time parameters are preprocessed to obtain first parameters, wherein the preprocessing at least includes temperature and pressure compensation processing;

[0063] In the embodiment, the throat difference, the exhaust pressure, the inlet temperature, the anti-surge valve feedback, and the throat differential pressure switch and other parameters (i.e. the aforementioned real-time parameters) are all connected to the PLC system through hardwiring, and signal preprocessing is performed to obtain the first parameters after preprocessing, wherein the throat difference and the exhaust pressure signal should be compensated for temperature and pressure (i.e. the aforementioned temperature and pressure compensation processing).

[0064] In step S302, a graph-to-number conversion processing is performed on the first parameters to determine the position of the real-time operating point in a preset energy graph;

[0065] In the embodiment, the control logic is adapted to the PLC, and the operating condition of the blower changes abnormally quickly, but the data collected by the upper computer (computer screen) has a delay, so under abnormal operating conditions, the operating point cannot reflect the real-time change of the operating condition. At this time, an anti-surge pixel graph (i.e. the aforementioned graph-to-number conversion processing) can be drawn to observe the relative position of the relevant operating point on the anti-surge pixel graph, which is convenient for the operator to judge and adjust the operating condition.

[0066] The converted energy graph can be a Port energy graph, the abscissa of which is the compensated throat difference value, and the ordinate of which is the compensated exhaust pressure value. After multiple tests, the regulation line, the emptying line, and a plurality of spaces divided by the regulation line and the emptying line can be obtained. The energy graph can also be a regulation and control model obtained by supervised or unsupervised processing of a neural network model, or other types of regulation and control models, which are not limited here.

[0067] At this time, according to the calculation output principle of PID, the main regulation at this moment is proportional regulation, so the focus of the control output is mainly on the selection of P value (proportional coefficient), and the integral time can be fixed at 12S. In particular, when the energy graph is a Port energy graph, the region below the regulation line (i.e. the regulation line in Figure 2 ) in the regulation line (i.e. the regulation line in Figure 2 ​In the safe operation region, the P value is 0.1, and the P value between the adjustment line and the venting line in the energy diagram is a fixed value P1 plus a variable value Px (P1 is set according to multiple experimental data). The specific calculation formula is:

[0068] P = P1 + Px x (Y - Y1) / (Y2 - Y1) (Formula 1)

[0069] Where Y is the exhaust pressure value of the working condition point, Y1 and Y2 are the vertical coordinate values of the adjustment line and the venting line corresponding to this moment respectively.

[0070] For the determination of Px, the principle followed is that the closer the working condition point is to the venting line (i.e. the farther away from the adjustment line), the greater the P value, the faster the response, and the greater the opening. According to the process setting requirements, Px can be set as 271.6 / (Y2-Y1)-1.8. It should be noted that the aforementioned value of Px is only used as an example for illustration and is not limited thereto. The corresponding values in the calculation formula of Px are not the same in different process environments, so the different corresponding parameter values should all fall within the protection scope of the present application. For example, when Px = 270 / (Y2-Y1)-1.5, it still falls within the protection scope of the present application.

[0071] Step S303, determining the working field of the real-time working condition point according to the position of the real-time working condition point in the converted energy diagram;

[0072] In this embodiment, according to the aforementioned related formula, it is determined whether the real-time working condition point is located in the safe operation region, the surge venting region or the adjustment region, and then adjustment is performed according to the adjustment strategy of the corresponding region.

[0073] In particular, for the Porter energy diagram as shown in Figure 2 Due to the slower processing response speed of the PLC than the original controller, and there is a certain error in the reverse calculation of the surge point data using the pixel points of the Porter energy diagram on the HMI screen, in order to ensure the timely response of the system, the vertical coordinates of the adjustment line and the venting line on the HMI screen are lowered by about 1%, and the new points are plotted into the anti-surge line.

[0074] Step S304, determining the control strategy according to the working field of the real-time working condition point, and performing target operation based on the control strategy, so that the real-time working condition point continuously operates in the preset safe region.

[0075] In this embodiment, different control strategies are adopted for the working condition points located in different regions, so that various types of working conditions can be controlled, thereby effectively improving the control efficiency and control accuracy, ensuring that the working condition point of the unit can operate in the safe region, and minimizing the influence of the downstream pressure and flow fluctuations, and ensuring the normal operation of the blower.

[0076] In an optional embodiment, the determining the control strategy according to the working field of the real-time working condition point, and performing the target operation based on the control strategy at least includes any one of the following:

[0077] In the case that the real-time working condition point changes to the first edge line, the first valve is controlled to open to a first angle, the real-time working condition point is restored to the safe region, and a first alarm processing is performed, wherein the energy diagram includes the first edge line;

[0078] Or,

[0079] In the case that the real-time working condition point changes between the first edge line and the second edge line, the first valve is controlled to open to a second angle, the second angle is greater than the first angle, and a second alarm processing is performed, wherein the energy diagram includes the second edge line, and the second edge line is located outside the safe region;

[0080] Or,

[0081] In the case that the real-time working condition point changes to outside the second edge line, the first valve is controlled to enter a full open state and a locking processing is performed on the first valve, and a third alarm processing is performed, wherein the region outside the second edge line is far away from the safe region.

[0082] In this embodiment, the final execution object of the anti-surge control is an anti-surge valve (corresponding to the first valve), and the above Figure 2 It can be known that, in a normal case, the real-time working condition point is running in the safe region.

[0083] When the external pipe network affects, causes the working condition to deteriorate, and the working condition point just crosses the regulating line (green line) (that is, the real-time working condition point changes to the first edge line), the anti-surge valve opens a small angle (that is, the first angle), the working condition point is pulled back to the vicinity below the regulating line, and the sound and light alarm rings (that is, the first alarm processing), reminding the operator that an abnormal working condition may occur. At this time, since the control output of the PID still exists, the working condition point will still approach the regulating line, and the advantage of the slow closing characteristic of the anti-surge valve control is embodied at this time, so as to give the running personnel sufficient thinking and operation time, and the working condition point is pulled back to the safe region by manually opening the anti-surge valve, so as to achieve the goal of protecting the unit.

[0084] When the working condition point deviates from the regulating line more and approaches the vent line (red line) more (that is, the real-time working condition point is located between the first edge line and the second edge line), the opening degree of the anti-surge valve (corresponding to the second angle) is greater, and the response speed is also faster (corresponding to the second alarm processing);

[0085] When the operating point reaches the blow-off line (corresponding to the aforementioned real-time operating point change to the second side line), the unit enters a safe operating state, the anti-surge valve is rapidly fully opened and locked, and the operating point is rapidly pulled back into the safe region, and the operating state and control strategy are as shown in Figure 4 .

[0086] It should be noted that during the operation of the unit, the operating condition will change in real time with the operation of the air supply pipe network, so that the operating point moves on the Potter energy diagram, and the local contact of the operating point with the regulating line or the passage of the operating point through the regulating line can be regarded as the movement of the operating point to the regulating line.

[0087] In an optional embodiment, after the real-time parameters of the blower are obtained, the method further comprises:

[0088] Step S3011, obtaining a target number of throat difference detection signals, wherein the throat difference detection signal is an analog signal;

[0089] Step S3012, in the case where the first number of throat difference values meets the preset reverse flow condition, performing a program delay protection operation.

[0090] In this embodiment, the throat difference detection signal of fluid flow can be obtained in real time by the target number of throat difference sensors installed on the fluid conveying pipeline. The throat difference sensor is a device that can convert the pressure change caused by fluid flow into an electrical signal, and the output signal is an analog signal; the purpose of the program delay protection operation is to give the operating personnel or the automatic control system time to take more effective measures to handle the reverse flow situation, so as to protect the safe and stable operation of the fluid conveying system.

[0091] Wherein, the target number of paths can be 3, more than 3, 1 or 2, as long as it can realize the judgment of reverse flow condition.

[0092] For example, the original throat difference switch signal is changed to an analog signal, combined with the other two throat difference detection signals, a three-out-of-two logic protection is realized in the program, that is, when two groups simultaneously meet the condition (throat difference less than 1.5kPa), it is considered that reverse flow phenomenon occurs, and appropriate delay (corresponding to the aforementioned program delay protection operation) is made in the program, lasting for 3S, an alarm signal is issued to remind the operating personnel to respond reasonably; lasting for 6S, the unit enters a safe operating state; when lasting for 9S, the system determines that it enters a "continuous reverse flow" state, and the unit is protected and interlocked to stop. By this logic algorithm, the unit is protected to avoid irreversible damage to the unit due to continuous reverse flow, and the control logic flow chart is as shown in Figure 5 .

[0093] In an alternative embodiment, after the control strategy is determined according to the working field of the real-time working point and the target operation is performed based on the control strategy, the method further comprises:

[0094] In step S305, control value information when the target operation is performed is acquired, the control value information being obtained based on a PID control algorithm, and the control value information including a control output value.

[0095] In step S306, the control output value is compared in a preset unit period.

[0096] In step S307, when it is determined that the control output value is in a first change state in the unit period, the control output value is transmitted to a final output end.

[0097] In step S308, when it is determined that the control output value is in a second change state in the unit period, the output value after the decrement is transmitted to the final output end according to a preset decrement and a preset first period.

[0098] In the embodiment, when the fan occurs a critical surge working condition (the working point reaches the regulation line), according to the control algorithm, the anti-surge valve is opened, at this time, the exhaust pressure is released, the working point is pulled back, the PID control output is reduced, at this time, the working point will rush to the regulation line and cross it. If no measures are taken, the working point will jump up and down near the regulation line, therefore, from the perspective of protecting the unit, the anti-surge valve control needs to have a fast opening and slow closing function.

[0099] In a specific implementation, an intermediate quantity is first increased, which is used for control transmission, and the control output (corresponding to the control output value) is compared with the final output (corresponding to the final output end) in a unit period (corresponding to the aforementioned preset unit period), when the control output increases (corresponding to the first change state), the control value is directly transmitted to the final output, realizing the "fast opening" of the opening function; when the control output decreases (corresponding to the second change state), the transmission quantity decreases by a fixed quantity per period, realizing the "slow closing" of the closing function, and currently, a rate of 1% per 4 seconds is adopted. In addition, the proportional coefficient value of the PID control is small below the regulation line; above the regulation line (below the emptying line), the proportional coefficient adopts variable P regulation, which can also guarantee the "fast opening and slow closing" function of the anti-surge valve to a certain extent.

[0100] It should be noted that step S307 and step S308 are not in sequence, and step S307 and step S308 are parallel, and the corresponding steps are executed according to the change state of the control output value.

[0101] In an alternative embodiment, the method further comprises:

[0102] Step S309, acquiring the motor running signal and the motor speed detection signal;

[0103] Step S3010, performing integral saturation elimination processing on the PID control algorithm according to the motor running signal and / or the motor speed detection signal.

[0104] In the embodiment, generally, the working condition points are running below the adjustment line, and the integral saturation occurs in daily maintenance due to the deviation between the PID control given value and the feedback value, resulting in the phenomenon that the anti-surge valve cannot act. In order to avoid this problem, on the one hand, two signals are added to the enable end of the PID block: ①, the "motor running" signal (corresponding to the aforementioned motor running signal), ②, the "speed greater than 300" (corresponding to the aforementioned motor speed detection signal); on the other hand, during shutdown maintenance, the overflow of the background data DB block is also checked, and cleaning is performed accordingly.

[0105] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be realized by means of software and the necessary general hardware platform, and of course it can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes a plurality of instructions for making a terminal device (which can be a mobile phone, computer, server, or network device, etc.) execute the method described in each embodiment of the present application.

[0106] In the embodiment, a safety control device for a blower is also provided, which is used to realize the above-mentioned embodiments and preferred embodiments, and will not be described again. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiments is preferably realized in software, hardware or a combination of software and hardware is also possible and is contemplated.

[0107] Figure 6 is a structure block diagram of a safety control device for a blower according to an embodiment of the present application, as shown in Figure 6 , the device comprises:

[0108] The parameter acquisition module 61 is used to acquire real-time parameters of the blower and pre-process the real-time parameters to obtain first parameters, wherein the pre-processing at least includes temperature and pressure compensation processing;

[0109] The node calculation module 62 is used to perform graph number conversion processing on the first parameters to determine the position of the real-time working condition point in the preset energy graph.

[0110] a working field determination module 63, configured to determine a working field of the real-time working condition point according to a position of the real-time working condition point in the preset energy map;

[0111] a target operation module 64, configured to determine a control strategy according to the working field of the real-time working condition point, and perform target operation based on the control strategy, so that the real-time working condition point continuously operates in the preset safe region.

[0112] In an optional embodiment, the determining the control strategy according to the working field of the real-time working condition point and performing the target operation based on the control strategy at least includes any one of the following:

[0113] in a case where the real-time working condition point changes to the first boundary line, controlling the first valve to open to a first angle, so that the real-time working condition point returns to the safe region, and performing first alarm processing, wherein the energy map includes the first boundary line;

[0114] or,

[0115] in a case where the real-time working condition point changes between the first boundary line and a second boundary line, controlling the first valve to open to a second angle, the second angle being greater than the first angle, and performing second alarm processing, wherein the energy map includes the second boundary line, and the second boundary line is outside the safe region;

[0116] or,

[0117] in a case where the real-time working condition point changes to outside the second boundary line, controlling the first valve to enter a full open state and performing locking processing on the first valve, and performing third alarm processing, wherein the region outside the second boundary line is far away from the safe region.

[0118] In an optional embodiment, the device includes:

[0119] a throat difference detection module, configured to, after the real-time parameters of the blower are acquired, acquire a target number of throat difference detection signals, wherein the throat difference detection signals are analog signals;

[0120] a reverse flow protection module, configured to, in a case where a first number of throat difference values meet a preset reverse flow condition, perform a program delay protection operation.

[0121] It should be noted that each of the above modules can be implemented by software or hardware, and for the latter, the following implementation manners can be used, but are not limited thereto: all the above modules are located in the same processor; or the above modules are located in different processors in any combination.

[0122] The application will be described below by specific examples.

[0123] This embodiment uses PLC logic programming combined with PID control to realize the anti-surge protection of the blower, ensuring that the process air supply is not affected, and specifically includes the following steps:

[0124] Step 1, all the parameters such as throat difference, exhaust pressure, inlet temperature, anti-surge valve feedback, and throat differential pressure switch originally connected to the TURBOLOG controller are hard-wired into the PLC system, and signal preprocessing is done, among which the throat difference and exhaust pressure signals should be temperature and pressure compensated;

[0125] Step 2, since the processing response speed of the PLC is slightly slower than the original controller, and there will be some errors in the anti-surge point data obtained by using the pixel points of the Boute energy image on the HMI screen to back-propagate, in order to ensure the timely response of the system, we move the longitudinal coordinate of the adjustment line and the emptying line on the HMI screen down by about 1%, and draw the new point as an anti-surge line;

[0126] Step 3, according to the process requirements, the controllable and reliable action of the execution object is the evaluation standard for the qualification of the control algorithm.

[0127] First of all, the signal accuracy of the detection equipment and the reliable action of the anti-surge valve are the basic requirements for the anti-surge control of the unit.

[0128] Secondly, while ensuring the rapid action of the execution mechanism, the negative fluctuations of the blast furnace air pressure and air volume should also be considered, and efforts should be made to minimize the impact.

[0129] Finally, ensuring the safety of the unit is the fundamental task. That is, in the event of extreme abnormal working conditions, the anti-surge valve is quickly opened to quickly pull the working condition point back to the safe area, avoiding the surge of the unit.

[0130] The final execution object of the anti-surge control is the anti-surge valve, combined with the above Figure 1It can be seen that, in normal circumstances, the working condition point is running in the safe area. When the external pipeline network affects the working condition, and the working condition point just crosses the regulation line (green line), the anti-surge valve opens a small angle, and the working condition point is pulled back to the vicinity below the regulation line, while the sound and light alarm rings, reminding the operator that the abnormal working condition may occur. Since the PID control output still exists, the working condition point will still approach the regulation line. At this time, the advantage of the slow closing feature of the anti-surge valve is reflected. This can give the operator enough thinking and operating time to pull the working condition point back to the safe area by manually opening the anti-surge valve to achieve the goal of protecting the unit. When the working condition point deviates from the regulation line more and approaches the vent line (red line) more, the opening of the anti-surge valve is larger, and the response speed is faster; when the working condition point reaches the vent line, the unit enters a safe operating state, the anti-surge valve is quickly fully opened and locked, and the working condition point is quickly pulled back to the safe area. The working condition and control strategy are as shown in Figure 4

[0131] Step 51: After determining the process improvement direction, the next step is to implement it in the logic function. When the fan working condition changes abnormally, according to the calculation output principle of PID, the proportional regulation plays a main role at this moment, so we mainly focus on the selection of P value (proportional coefficient) in the control output. The integral time is fixed at 12S. The P value below the regulation line is 0.1, and the P value between the regulation line and the vent line is a fixed value P1 plus a variable value Px (P1 is set according to multiple experimental data).

[0132] The specific calculation formula is: P = P1 + Px × (Y-Y1) / (Y2-Y1)

[0133] Where Y is the exhaust pressure value of the working condition point, Y1 and Y2 are the vertical coordinate values of the regulation line and the vent line at this moment, respectively.

[0134] For the determination of Px, the principle followed is that the closer the working condition point is to the vent line (i.e. the farther it is from the regulation line), the larger the P value, the faster the response, and the larger the opening. According to the process setting requirements, Px is ultimately derived as 271.6 / (Y2-Y1)-1.8;

[0135] Step 52: Change the original throat difference switch signal to an analog signal, combine with the other two throat difference detection signals, and realize three-out-of-two logic protection in the program, that is, when two groups simultaneously satisfy the condition (throat difference less than 1.5kPa), it is considered that reverse flow occurs, and appropriate delay is made in the program for 3S, an alarm signal is issued to remind the operator to respond reasonably; for 6S, the unit enters a safe operating state; when it lasts for 9S, the system determines that it is in a "continuous reverse flow" state, and the unit is protective interlocked to shut down. Through this logic algorithm, the unit is protected to avoid irreversible damage to the unit due to continuous reverse flow. The control logic flow chart is as shown in Figure 5 ​As shown;

[0136] Step 53, when the fan occurs critical surge condition (the working condition point reaches the regulation line), according to the control algorithm, the anti-surge valve will be opened, at this time the exhaust pressure is released, the working condition point is pulled back, the PID control output will be reduced, at this time the working condition point will hit the regulation line again and pass. If no measures are taken, the working condition point will jump up and down near the regulation line, therefore, from the perspective of protecting the unit, the anti-surge valve control needs to have the functions of "fast opening and slow closing";

[0137] In the specific implementation, an intermediate quantity is added as a control transmission, and the control output is compared with the final output in a unit period, when the control output is increased, the control value is directly transmitted to the final output, the "fast opening" of the opening function is realized, when the control output is reduced, the transmission quantity is reduced by a fixed quantity per period, the "slow closing" of the closing function is realized, and currently, a rate of 1% closing per 4 seconds is adopted. In addition, the proportional coefficient value of the PID control is small below the regulation line, and the proportional coefficient adopts variable P regulation above the regulation line (below the blow-off line), which can also guarantee the "fast opening and slow closing" functions of the anti-surge valve to a certain extent;

[0138] Step 54, when the working condition point is between the blow-off line and the regulation line, the HMI manual closing function is locked to prevent misoperation; when the working condition point exceeds the blow-off line, the PID is cut to the manual state, and the full opening signal of the output valve is output;

[0139] Step 55, an alarm line (not shown in the picture) is added below the regulation line to remind the operator to pay attention to the position of the working condition point and avoid unnecessary losses caused by misoperation;

[0140] Step 56, generally, the working condition point is running below the regulation line, and since the deviation between the given and the feedback of the PID control always exists, integral saturation occurs in daily maintenance, causing the anti-surge valve to be unable to act. In order to avoid this problem, on the one hand, two signals are added to the enable end of the PID block: ①, "motor running" signal, ②, "rotating speed greater than 300"; on the other hand, when the machine is stopped for maintenance, the overflow of the background data DB block is also checked, and cleaning is performed according to the situation.

[0141] The embodiment of the application also provides a computer readable storage medium, and the computer readable storage medium stores a computer program, wherein the computer program is set to execute the steps in any one of the method embodiments.

[0142] In an example embodiment, the computer readable storage medium described above can include, but is not limited to, a U disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and various media capable of storing computer programs.

[0143] Embodiments of the present application also provide an electronic device including a memory and a processor, the memory storing a computer program, and the processor being configured to execute the computer program to perform the steps in any of the method embodiments described above.

[0144] In an example embodiment, the electronic device described above can further include a transmission device connected to the processor and an input and output device connected to the processor.

[0145] The specific examples in the embodiments can refer to the examples described in the above embodiments and example embodiments, and will not be described here again.

[0146] Obviously, those skilled in the art should understand that the modules or steps of the present application described above can be realized by general computing devices, which can be concentrated on a single computing device or distributed on a network composed of multiple computing devices, and can be realized by program codes executable by computing devices, so that they can be stored in storage devices and executed by computing devices, and in some cases, the steps shown or described can be executed in different order, or they can be manufactured into individual integrated circuit modules, or multiple modules or steps can be manufactured into a single integrated circuit module. Thus, the present application is not limited to any specific combination of hardware and software.

[0147] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A safety control method for a blower, characterized by, The method comprises: acquiring real-time parameters of the air blower and pre-processing the real-time parameters to obtain first parameters, wherein the pre-processing at least includes temperature and pressure compensation processing; performing graph number conversion processing on the first parameters to determine the position of the real-time working condition point in a preset energy graph; determining the working field of the real-time working condition point according to the position of the real-time working condition point in the preset energy graph; determining a control strategy according to the working field of the real-time working condition point, and performing a target operation based on the control strategy to enable the real-time working condition point to continuously operate in a preset safe area; wherein the determination of the control strategy according to the working field of the real-time working condition point and the performance of the target operation based on the control strategy at least include any one of the following: in the case that the real-time working condition point changes to a first boundary line, control the first valve to open to a first angle, so that the real-time working condition point returns to the safe area, and perform a first alarm processing, wherein the energy graph includes the first boundary line; or, in the case that the real-time working condition point changes between the first boundary line and a second boundary line, control the first valve to open to a second angle, the second angle being greater than the first angle, and perform a second alarm processing, wherein the energy graph includes the second boundary line, and the second boundary line is outside the safe area; or, in the case that the real-time working condition point changes to outside the second boundary line, control the first valve to enter a full open state and perform a locking processing on the first valve, and perform a third alarm processing, wherein the area outside the second boundary line is far away from the safe area; wherein after acquiring the real-time parameters of the air blower, the method further comprises: acquiring a target number of throat difference detection signals, wherein the throat difference detection signal is an analog signal; in the case that the first number of throat difference values meets a preset backflow condition, performing a program delay protection operation; wherein after determining the control strategy according to the working field of the real-time working condition point and performing the target operation based on the control strategy, the method further comprises: acquiring control value information when the target operation is performed, the control value information being obtained based on a PID control algorithm, the control value information including a control output value; performing comparison processing on the control output value in a preset unit period; in the case that it is determined that the control output value is in a first change state in the unit period, transmitting the control output value to a final output end; in the case that it is determined that the control output value is in a second change state in the unit period, transmitting the decremented output value to the final output end according to a preset decrement and a preset first period.

2. The method of claim 1, wherein, The method further comprises: acquiring motor running signals and motor speed detection signals; performing integral saturation elimination processing on the PID control algorithm according to the motor running signals and / or motor speed detection signals.

3. A safety control device for a blower, characterized by comprising: The method of claim 1 comprises: a parameter acquisition module for acquiring real-time parameters of the air blower and pre-processing the real-time parameters to obtain first parameters, wherein the pre-processing at least includes temperature and pressure compensation processing; The node computing module is configured to perform graph conversion processing on the first parameter to determine a position of a real-time working condition point in a preset energy graph. The working field determining module is configured to determine a working field of the real-time working condition point according to the position of the real-time working condition point in the preset energy graph. The target operation module is configured to determine a control strategy according to the working field of the real-time working condition point, and perform a target operation based on the control strategy, so that the real-time working condition point continuously operates in a preset safe region.

4. The apparatus of claim 3, wherein, The determination of the control strategy according to the working field of the real-time working condition point and the performance of the target operation based on the control strategy at least include any one of the following: In a case where the real-time working condition point changes to a first boundary line, the first valve is controlled to open to a first angle, so that the real-time working condition point returns to the safe region, and a first alarm processing is performed, wherein the energy graph includes the first boundary line. Or, In a case where the real-time working condition point changes between a first boundary line and a second boundary line, the first valve is controlled to open to a second angle, the second angle is greater than the first angle, and a second alarm processing is performed, wherein the energy graph includes the second boundary line, and the second boundary line is located outside the safe region. Or, In a case where the real-time working condition point changes outside the second boundary line, the first valve is controlled to enter a full open state and a locking processing is performed on the first valve, and a third alarm processing is performed, wherein the region outside the second boundary line is far away from the safe region.

5. The apparatus of claim 3, wherein, The device includes: The throat difference detecting module is configured to, after the real-time parameter of the blower is acquired, acquire a throat difference detecting signal of a target number of paths, wherein the throat difference detecting signal is an analog signal. The reverse flow protection module is configured to, in a case where a throat difference value of a first number of paths meets a preset reverse flow condition, perform a program delay protection operation.

6. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, wherein the computer program is set to execute the method in any one of claims 1 to 2 when running. 7.An electronic device comprising a memory and a processor, the electronic device characterized by, The memory stores a computer program, and the processor is set to execute the method in any one of claims 1 to 2 by running the computer program.

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