Method and device for controlling current limit of electrostatic fabric filter

Abstract

The invention belongs to the technical field of intelligent control, and relates to a control method and device for the current limit of an electrostatic fabric filter, and the method comprises the steps: obtaining the actual measurement load data of a heat unit under the current working condition; according to the actually measured load data and a pre-established load-current limit curve, determining an expected current limit of the electrostatic fabric filter under the current working condition; if the expected current limit is within a preset safety margin range, determining an expected output voltage of the power supply according to the expected current limit; and adjusting the output voltage of the power supply to the expected output voltage so as to control the electrostatic fabric filter to operate under the expected current limit. According to the scheme provided by the invention, the current limit can be automatically controlled according to the load-current limit curve, and the constraint of the safety margin range is matched, so that the regulation and control safety of the current limit is improved, the regulation and control efficiency of the current limit of the electrostatic fabric filter is improved, and efficient, reliable and safe regulation and control of the current limit are realized.

Description

Technical Field

[0001] The present invention relates to the field of intelligent control technology, and in particular to a method and device for controlling the current limit of an electric bag composite dust collector. Background Art

[0002] In modern industrial production, electric bag composite dust collectors are widely used in thermal power, steel, cement and other industries due to their efficient dust removal performance. They are used to treat large amounts of dust-containing flue gas generated in the production process, playing a vital role in reducing dust emissions and protecting the ecological environment.

[0003] In the related art, the current limit of the electric bag composite dust collector usually needs to be adjusted manually during operation. In actual operation, the load of the thermal unit will change frequently with production demand, and different thermal unit loads correspond to different optimal current limit values ​​to ensure that the electric bag composite dust collector always maintains an efficient dust removal effect. At this time, the operator is required to closely monitor the thermal unit load and the various operating parameters of the electric bag composite dust collector at all times. Once the operating parameters are found to deviate from the ideal range, the operator needs to manually adjust the current limit based on experience.

[0004] This manual adjustment method greatly increases the monitoring and operation burden of operators, and is prone to the risk of failure to adjust the current limit in time due to human negligence, which may lead to problems such as poor dust removal effect and excessive dust emissions. At the same time, manual adjustment errors are easily introduced during the manual adjustment process, affecting the control accuracy.

[0005] It can be seen that the traditional manual current limit control method has the problems of being time-consuming and labor-intensive, having low control accuracy and insufficient control reliability. Summary of the invention

[0006] The present invention provides a method and device for controlling the current limit of an electric bag composite dust collector, which are used to solve the defects of the traditional manual current limit control method, which is time-consuming and labor-intensive, has low control accuracy and insufficient control reliability.

[0007] In one aspect, the present invention provides a method for controlling the current limit of an electric bag composite dust collector, wherein the electric bag composite dust collector is connected to a thermal unit and a power supply, respectively, and the method comprises: Obtain the measured load data of the thermal unit under the current operating conditions; Determine the expected current limit of the electric bag composite dust collector under the current working conditions based on the measured load data and the pre-established load-current limit curve; If the expected current limit is within a preset safety margin range, determining the expected output voltage of the power supply according to the expected current limit; The output voltage of the power supply is adjusted to the desired output voltage to control the electric bag composite dust collector to operate under the desired current limit.

[0008] According to the method for controlling the current limit of an electric bag composite dust collector provided by the present invention, the load-current limit curve is established through the following process: Obtain historical load data of thermal units under different operating conditions and historical flue gas dust content data of electric bag composite dust collector; The historical flue gas dust content data of the electric bag composite dust collector under different working conditions are respectively input into the pre-built data calculation model to obtain the historical current limit of the electric bag composite dust collector under different working conditions; A load-current limit curve is established based on the historical load data of thermal units under different operating conditions and the historical current limit of electric bag composite dust collector.

[0009] According to the control method of the current limit of the electric bag composite dust collector provided by the present invention, the data calculation model includes: an electric field force calculation module and a current limit calculation module; The historical flue gas dust content data of the electric bag composite dust collector under different working conditions are input into the pre-built data calculation model to obtain the historical current limit of the electric bag composite dust collector under different working conditions, including: The historical flue gas dust content data of the electric bag composite dust collector under different working conditions are respectively input into the electric field force calculation module to obtain the historical electric field force under different working conditions; The historical electric field forces under different working conditions are respectively input into the current limit calculation module to obtain the historical current limits of the electric bag composite dust collector under different working conditions.

[0010] According to the control method of the current limit of the electric bag composite dust collector provided by the present invention, the historical flue gas dust content data includes: flue gas flow rate, dust charge, flue gas viscosity and dust particle size; The electric field force calculation module comprises: A first calculation submodule is used to calculate the dust driving speed according to the flue gas flow rate, a preset dust removal efficiency setting value and a dust collecting plate area; The second calculation submodule is used to calculate the historical electric field force according to the dust driving speed, the dust charge, the smoke viscosity and the dust particle size.

[0011] According to the control method of the current limit of the electric bag composite dust collector provided by the present invention, the current limit calculation module includes: The coefficient calculation submodule is used to calculate the intermediate coefficient value based on the dust charge in the historical flue gas dust content data and the preset dust collecting plate spacing and voltage-current correlation coefficient; The result calculation submodule is used to multiply the historical electric field force by the intermediate coefficient value to calculate the historical current limit.

[0012] According to the method for controlling the current limit of the electric bag composite dust collector provided by the present invention, the expected output voltage of the power supply is determined according to the expected current limit, including: Establishing a voltage control comparison table; wherein the voltage control comparison table is used to characterize the corresponding relationship between the output voltage and the current limit of the power supply; Retrieving a target output voltage corresponding to the desired current limit from the voltage control comparison table; The target output voltage is used as the expected output voltage of the power supply.

[0013] According to the method for controlling the current limit of an electric bag composite dust collector provided by the present invention, after adjusting the output voltage of the power supply to the desired output voltage, the method further includes: Obtain the inlet dust concentration, inlet flue gas flow rate, outlet dust concentration and outlet flue gas flow rate of the electric bag composite dust collector; The dust removal quality evaluation value of the electric bag composite dust collector is calculated based on the inlet dust concentration, inlet flue gas flow rate, outlet dust concentration and outlet flue gas flow rate of the electric bag composite dust collector; If the dust removal quality assessment value is lower than a preset quality threshold, the load-current limit curve is corrected.

[0014] According to the method for controlling the current limit of the electric bag composite dust collector provided by the present invention, the load-current limit curve is corrected, including: Obtain the measured load data of the thermal unit and the measured operation data of the electric bag composite dust collector; Comparing the measured load data and the measured operation data with their corresponding standard reference data to obtain a comparison result; Determine the root cause of the dust removal error based on the comparison result; According to the dust removal error root cause, at least part of the data points in the load-current limit curve are adjusted to correct the load-current limit curve.

[0015] According to the method for controlling the current limit of the electric bag composite dust collector provided by the present invention, at least part of the data points in the load-current limit curve are adjusted according to the root cause of the dust removal error, including: Determine a target data point in the load-current limit curve corresponding to the measured load data, and determine a preset number of adjacent data points on both sides of the target data point; Determine a numerical adjustment coefficient corresponding to the current limit according to the dust removal error root cause; According to the numerical adjustment coefficient, the current limits of the target data point and a plurality of adjacent data points are adjusted respectively.

[0016] On the other hand, the present invention also provides a control device for the current limit of an electric bag composite dust collector, wherein the electric bag composite dust collector is connected to a thermal unit and a power supply, respectively, and the device comprises: An acquisition module is used to obtain the measured load data of the thermal unit under the current working conditions; A first processing module is used to determine the expected current limit of the electric bag composite dust collector under the current working conditions according to the measured load data and the pre-established load-current limit curve; A second processing module, configured to determine an expected output voltage of the power supply according to the expected current limit when the expected current limit is within a preset safety margin range; The control module is used to adjust the output voltage of the power supply to the desired output voltage so as to control the electric bag composite dust collector to operate under the desired current limit.

[0017] The control method and device of the current limit of the electric bag composite dust collector provided by the present invention obtains the measured load data of the thermal unit under the current working conditions, and determines the expected current limit of the electric bag composite dust collector under the current working conditions based on the measured load data and the pre-established load-current limit curve. If the expected current limit is within the preset safety margin range, the expected output voltage of the power supply is determined based on the expected current limit, and the output voltage of the power supply is adjusted to the expected output voltage to control the electric bag composite dust collector to operate under the expected current limit. Since the current limit can be automatically controlled according to the load-current limit curve, and in conjunction with the constraints of the safety margin range, the safety of the current limit regulation is improved, and the efficiency of the current limit regulation of the electric bag composite dust collector is improved, and the current limit is efficiently, reliably and safely regulated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a flow chart of a method for controlling the current limit of an electric bag composite dust collector provided by an embodiment of the present invention; Figure 2 is the load-current limit curve corresponding to the 350MW thermal unit in the embodiment of the present invention; Figure 3It is a structural schematic diagram of a current limit control device for an electric bag composite dust collector provided in an embodiment of the present invention; Figure 4 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Combine the following Figures 1 to 4 The detailed scheme of the control method and device of the current limit of the electric bag composite dust collector provided by the embodiment of the present invention is described.

[0022] Figure 1 It is a flow chart of a method for controlling the current limit of an electric bag composite dust collector provided in an embodiment of the present invention.

[0023] like Figure 1 As shown, the control method of the current limit of the electric bag composite dust collector provided by the embodiment of the present invention can be executed by a computer or server with data receiving and data processing capabilities, wherein the electric bag composite dust collector is connected to the thermal unit and the power supply respectively, and the above method mainly includes the following steps: Step 110: Obtain the actual load data of the thermal unit under the current operating conditions.

[0024] In practical applications, the operation panel of the thermal unit is usually equipped with various instruments, such as an ammeter, a voltmeter, a power meter, etc. These instruments can intuitively display the operating parameters of the thermal unit, and can calculate the load value of the thermal unit in combination with the rated parameters and operating characteristics of the thermal unit. For example, the actual load value of the thermal unit can be calculated based on the current value displayed by the ammeter and the rated current and power factor of the thermal unit. The actual load value is the measured load data in this embodiment.

[0025] Step 120: Determine the expected current limit of the electric bag composite dust collector under the current operating conditions based on the measured load data and the pre-established load-current limit curve.

[0026] In this embodiment, the load-current limit curve can represent the corresponding relationship between the load data of the thermal unit and the current limit of the electric bag composite dust collector, and can be established by data fitting.

[0027] Step 130: If the expected current limit is within a preset safety margin range, determine the expected output voltage of the power supply according to the expected current limit.

[0028] It is understandable that in order to ensure the safety of the regulation process, the current limit usually cannot reach the maximum tolerance of the device. Generally, a safety margin of 20% to 30% should be reserved. If the maximum theoretically tolerable current of the device is I max , the safety margin range can be set to 20%I max to 30%I max .

[0029] Step 140: Adjust the output voltage of the power supply to a desired output voltage to control the electric bag composite dust collector to operate under a desired current limit.

[0030] In practical applications, the power supply can be a high voltage power supply of the electric bag composite dust collector. Since the output of the power supply will directly affect the current limit of the electric bag composite dust collector, the current limit of the electric bag composite dust collector can be automatically regulated by controlling the output voltage of the power supply.

[0031] In one embodiment, the load-current limit curve may be established through the following process: The first step is to obtain the historical load data of the thermal unit under different operating conditions and the historical flue gas dust content data of the electric bag composite dust collector.

[0032] In practical applications, data recorders can be installed to continuously record the operating parameters of thermal units and the dust content data of flue gas from electric bag composite dust collectors. Data recorders can automatically collect and store various parameters. Operators can obtain historical load data of thermal units and historical dust content data of flue gas from electric bag composite dust collectors in different time periods by consulting the data in the data recorders.

[0033] In the second step, the historical flue gas dust content data of the electric bag composite dust collector under different operating conditions are input into the pre-built data calculation model to obtain the historical current limit of the electric bag composite dust collector under different operating conditions.

[0034] It can be understood that the data calculation model can realize efficient calculation of the historical current limit through multiple pre-established mathematical calculation modules, so as to obtain the corresponding historical current limit according to the historical flue gas dust content data of the electric bag composite dust collector under different working conditions.

[0035] The third step is to establish a load-current limit curve based on the historical load data of the thermal unit under different operating conditions and the historical current limit of the electric bag composite dust collector.

[0036] In practical applications, the historical load data of thermal units under different operating conditions and the historical current limit of electric bag composite dust collectors can be fitted to establish a load-current limit curve. Taking a 350MW thermal unit as an example, the load-current limit curve can be found in Figure 2 shown.

[0037] In some embodiments, before data fitting, preprocessing operations such as data cleaning and data completion may be performed on the historical load data of the thermal unit under different operating conditions and the historical current limit of the electric bag composite dust collector to ensure the accuracy of the subsequent data fitting process.

[0038] In one embodiment, the data calculation model specifically includes: an electric field force calculation module and a current limit calculation module.

[0039] The historical flue gas dust content data of the electric bag composite dust collector under different working conditions are input into the pre-built data calculation model to obtain the historical current limit of the electric bag composite dust collector under different working conditions, including: Firstly, the historical flue gas dust content data of the electric bag composite dust collector under different working conditions are respectively input into the electric field force calculation module to obtain the historical electric field force under different working conditions.

[0040] Then, the historical electric field forces under different working conditions are respectively input into the current limit calculation module to obtain the historical current limits of the electric bag composite dust collector under different working conditions.

[0041] Exemplarily, the historical flue gas dust content data specifically includes: flue gas flow rate, dust charge, flue gas viscosity and dust particle size.

[0042] In a specific implementation, the electric field force calculation module specifically includes: The first calculation submodule is used to calculate the dust driving speed according to the flue gas flow rate, the preset dust removal efficiency setting value and the dust collecting plate area.

[0043] In this embodiment, the calculation formula of the dust driving speed is as follows: (1) in, w Indicates the dust driving speed, Q represents the flue gas flow rate, A Indicates the dust collecting plate area, b Indicates the dust removal efficiency setting value.

[0044] The second calculation submodule is used to calculate the historical electric field force according to the dust driving speed, dust charge, flue gas viscosity and dust particle size.

[0045] In this embodiment, the calculation formula of the historical electric field force is as follows: (2) in, F represents the historical electric force, u Indicates the smoke viscosity, r Indicates the dust particle size, q Indicates the dust charge. w Indicates the dust driving speed.

[0046] In one embodiment, the current limit calculation module includes: The coefficient calculation submodule is used to calculate the intermediate coefficient value based on the dust charge in the historical flue gas dust content data and the preset dust collecting plate spacing and voltage-current correlation coefficient.

[0047] The result calculation submodule is used to multiply the historical electric field force by the intermediate coefficient value to calculate the historical current limit.

[0048] In this embodiment, the calculation formula of the historical current limit is as follows: (3) in, I represents the historical current limit, F represents the historical electric force, k represents the voltage-current correlation coefficient, d Indicates the distance between dust collecting plates. q Indicates the dust charge.

[0049] In one embodiment, determining the expected output voltage of the power supply according to the expected current limit specifically includes: First, a voltage control comparison table is established; wherein the voltage control comparison table is used to characterize the corresponding relationship between the output voltage and the current limit of the power supply.

[0050] In this embodiment, the voltage control comparison table can be established based on the previously obtained historical output voltage of the power supply and the historical current limit of the electric bag composite dust collector.

[0051] Then, the target output voltage corresponding to the desired current limit is retrieved from the voltage control lookup table.

[0052] It is understandable that by referring to the voltage control comparison table, the target output voltage corresponding to the desired current limit can be accurately and quickly determined.

[0053] Finally, the target output voltage is taken as the desired output voltage of the power supply.

[0054] In one embodiment, after adjusting the output voltage of the power supply to the desired output voltage, the method may further include: First, the inlet dust concentration, inlet flue gas flow rate, outlet dust concentration and outlet flue gas flow rate of the electric bag composite dust collector are obtained.

[0055] Then, the dust removal quality evaluation value of the electric bag composite dust collector is calculated based on the inlet dust concentration, inlet flue gas flow rate, outlet dust concentration and outlet flue gas flow rate of the electric bag composite dust collector.

[0056] In this embodiment, the calculation formula of the dust removal quality evaluation value is as follows: (4) in, E Indicates the dust removal quality assessment value, C in Indicates the inlet dust concentration, Q in represents the inlet flue gas flow rate, C in Indicates the dust concentration at the outlet. Q out Indicates the outlet flue gas flow rate.

[0057] It can be understood that the dust removal quality evaluation value can characterize the dust removal effect of the electric bag composite dust collector. The higher the dust removal quality evaluation value, the better the dust removal effect of the electric bag composite dust collector.

[0058] Finally, if the dust removal quality assessment value is lower than the preset quality threshold, the load-current limit curve is corrected.

[0059] In a specific implementation, the load-current limit curve is corrected, specifically including: The first step is to obtain the measured load data of the thermal unit and the measured operation data of the electric bag composite dust collector.

[0060] In this embodiment, the measured operating data of the electric bag composite dust collector includes parameters such as operating current, dust specific resistance, outlet flue gas flow rate, outlet flue gas temperature, and outlet flue gas humidity.

[0061] In the second step, the measured load data and the measured operation data are compared with their corresponding standard reference data to obtain the comparison results.

[0062] It can be understood that corresponding standard reference data are set for each parameter in the measured load data and the measured operation data, and a comparison result can be obtained by comparing the measured data with the corresponding standard reference data.

[0063] The third step is to determine the root cause of dust removal error based on the comparison results.

[0064] It can be understood that, through the comparison results, abnormal data that seriously deviates from the corresponding standard reference data can be determined, and then the root cause of the dust removal error can be determined based on the abnormal data.

[0065] For example, if the dust resistivity is seriously higher than the corresponding standard reference data, for example, the difference between the dust resistivity and the corresponding standard reference data exceeds the set deviation upper limit, it means that the dust resistivity exceeds the standard. At this time, the root cause of the dust removal error can be recorded as the dust resistivity exceeds the standard.

[0066] In the fourth step, at least some of the data points in the load-current limit curve are adjusted according to the root cause of the dust removal error to correct the load-current limit curve.

[0067] Exemplarily, according to the root cause of the dust removal error, at least some of the data points in the load-current limit curve are adjusted, specifically including: First, a target data point corresponding to the measured load data in the load-current limit curve is determined, and a preset number of adjacent data points on both sides of the target data point are determined.

[0068] It can be understood that the horizontal axis of the load-current limit curve is the load data, and the vertical axis is the current limit. Therefore, according to the numerical value corresponding to the measured load data, the target data point with the coordinate value of the horizontal axis as the numerical value can be found from the load-current limit curve, and then a preset number of adjacent data points on both sides of the target data point are taken as adjacent data points.

[0069] In practical applications, the preset number can be reasonably set according to actual correction requirements. For example, the preset number can be set to 6. In this case, the three data points adjacent to the left side of the target data point and the three data points adjacent to the right side of the target data point can be used as adjacent data points.

[0070] Then, according to the root cause of the dust removal error, the numerical adjustment coefficient corresponding to the current limit is determined.

[0071] In this embodiment, a correspondence between the root cause of dust removal error and the data adjustment coefficient can be established in advance, and the correspondence can be presented in the form of a data comparison table. Subsequently, the corresponding numerical adjustment coefficient can be determined according to the root cause of dust removal error. For example, when the root cause of dust removal error is that the dust resistivity exceeds the standard, the corresponding numerical adjustment coefficient can be increased by 10%, that is, the current limit is increased by 10%.

[0072] Finally, the current limits of the target data point and a plurality of adjacent data points are adjusted respectively according to the numerical adjustment coefficient.

[0073] This embodiment adjusts the current limits of the target data point and multiple adjacent data points according to the numerical adjustment coefficient, so as to realize the correction of the load-current limit curve according to the dust removal quality, and further improve the control effectiveness of the current limit.

[0074] In some embodiments, this embodiment can also use the measured load data of the thermal unit during the control process, the expected current limit of the electric bag composite dust collector, and the expected output voltage of the power supply as table contents to generate a data monitoring report, and send the data monitoring report and the load-current limit curve to the staff's monitoring terminal, so that the staff can monitor the parameter changes of the control process in real time.

[0075] Based on the same general inventive concept, the present invention also protects a control device for the current limit of an electric bag composite dust collector. The control device for the current limit of an electric bag composite dust collector provided by the present invention is described below. The control device for the current limit of an electric bag composite dust collector described below and the control method for the current limit of an electric bag composite dust collector described above can be referenced to each other.

[0076] like Figure 3 As shown, an electric bag composite dust collector current limit control device provided by an embodiment of the present invention, wherein the electric bag composite dust collector is connected to a thermal unit and a power supply respectively, and the above device specifically includes: The acquisition module 210 is used to obtain the actual load data of the thermal unit under the current working conditions.

[0077] The first processing module 220 is used to determine the expected current limit of the electric bag composite dust collector under the current working conditions based on the measured load data and the pre-established load-current limit curve.

[0078] The second processing module 230 is used to determine the expected output voltage of the power supply according to the expected current limit when the expected current limit is within a preset safety margin range.

[0079] The control module 240 is used to adjust the output voltage of the power supply to a desired output voltage so as to control the electric bag composite dust collector to operate under a desired current limit.

[0080] Regarding the device in the above embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment of the method, and will not be elaborated again here.

[0081] It can be seen that the control device for the current limit of the electric bag composite dust collector provided in this embodiment improves the safety of current limit regulation and the efficiency of current limit regulation of the electric bag composite dust collector, because the current limit can be automatically controlled according to the load-current limit curve and cooperates with the constraints of the safety margin range, thereby realizing efficient, reliable and safe regulation of the current limit, reducing the operating burden of the operator, improving the level of automatic control of the equipment, reducing the impact of human error operation, and achieving energy saving and consumption reduction effects.

[0082] Figure 4 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention.

[0083] like Figure 4 As shown, the electronic device may include: a processor 310, a communication interface 320, a memory 330 and a communication bus 340, wherein the processor 310, the communication interface 320 and the memory 330 communicate with each other through the communication bus 340. The processor 310 may call the logic instructions in the memory 330 to execute the control method of the current limit of the electric bag composite dust collector provided in the above embodiments, the method comprising: obtaining the measured load data of the thermal unit under the current working condition; determining the expected current limit of the electric bag composite dust collector under the current working condition according to the measured load data and the pre-established load-current limit curve; if the expected current limit is within the preset safety margin range, determining the expected output voltage of the power supply according to the expected current limit; adjusting the output voltage of the power supply to the expected output voltage to control the electric bag composite dust collector to operate under the expected current limit.

[0084] In addition, the logic instructions in the above-mentioned memory 330 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0085] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the current limit of the electric bag composite dust collector provided in the above-mentioned embodiments, and the method includes: obtaining the measured load data of the thermal unit under the current operating conditions; determining the expected current limit of the electric bag composite dust collector under the current operating conditions based on the measured load data and a pre-established load-current limit curve; if the expected current limit is within a preset safety margin range, determining the expected output voltage of the power supply based on the expected current limit; adjusting the output voltage of the power supply to the expected output voltage to control the electric bag composite dust collector to operate under the expected current limit.

[0086] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for controlling the current limit of the electric bag composite dust collector provided in the above-mentioned embodiments is implemented. The method includes: obtaining measured load data of the thermal unit under current operating conditions; determining the expected current limit of the electric bag composite dust collector under current operating conditions based on the measured load data and a pre-established load-current limit curve; if the expected current limit is within a preset safety margin range, determining the expected output voltage of the power supply based on the expected current limit; and adjusting the output voltage of the power supply to the expected output voltage to control the electric bag composite dust collector to operate under the expected current limit.

[0087] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0088] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the current limit of an electric bag composite dust collector, characterized in that: The electric bag composite dust collector is connected to the thermal unit and the power supply respectively, and the method comprises: Obtain the measured load data of the thermal unit under the current operating conditions; Determine the expected current limit of the electric bag composite dust collector under the current working conditions based on the measured load data and the pre-established load-current limit curve; If the expected current limit is within a preset safety margin range, determining the expected output voltage of the power supply according to the expected current limit; The output voltage of the power supply is adjusted to the desired output voltage to control the electric bag composite dust collector to operate under the desired current limit.

2. The method for controlling the current limit of an electric bag composite dust collector according to claim 1, characterized in that: The load-current limit curve is established by the following process: Obtain historical load data of thermal units under different operating conditions and historical flue gas dust content data of electric bag composite dust collector; The historical flue gas dust content data of the electric bag composite dust collector under different working conditions are respectively input into the pre-built data calculation model to obtain the historical current limit of the electric bag composite dust collector under different working conditions; A load-current limit curve is established based on the historical load data of thermal units under different operating conditions and the historical current limit of electric bag composite dust collector.

3. The method for controlling the current limit of an electric bag composite dust collector according to claim 2, characterized in that: The data calculation model includes: an electric field force calculation module and a current limit calculation module; The historical flue gas dust content data of the electric bag composite dust collector under different working conditions are input into the pre-built data calculation model to obtain the historical current limit of the electric bag composite dust collector under different working conditions, including: The historical flue gas dust content data of the electric bag composite dust collector under different working conditions are respectively input into the electric field force calculation module to obtain the historical electric field force under different working conditions; The historical electric field forces under different working conditions are respectively input into the current limit calculation module to obtain the historical current limits of the electric bag composite dust collector under different working conditions.

4. The method for controlling the current limit of an electric bag composite dust collector according to claim 3, characterized in that: The historical flue gas dust content data includes: flue gas flow rate, dust charge, flue gas viscosity and dust particle size; The electric field force calculation module includes: A first calculation submodule is used to calculate the dust driving speed according to the flue gas flow rate, a preset dust removal efficiency setting value and a dust collecting plate area; The second calculation submodule is used to calculate the historical electric field force according to the dust driving speed, the dust charge, the smoke viscosity and the dust particle size.

5. The method for controlling the current limit of an electric bag composite dust collector according to claim 3, characterized in that: The current limit calculation module includes: The coefficient calculation submodule is used to calculate the intermediate coefficient value based on the dust charge in the historical flue gas dust content data and the preset dust collecting plate spacing and voltage-current correlation coefficient; The result calculation submodule is used to multiply the historical electric field force by the intermediate coefficient value to calculate the historical current limit.

6. The method for controlling the current limit of an electric bag composite dust collector according to claim 1, characterized in that: Determining the expected output voltage of the power supply according to the expected current limit includes: Establishing a voltage control comparison table; wherein the voltage control comparison table is used to characterize the corresponding relationship between the output voltage and the current limit of the power supply; Retrieving a target output voltage corresponding to the desired current limit from the voltage control comparison table; The target output voltage is used as the expected output voltage of the power supply.

7. The method for controlling the current limit of an electric bag composite dust collector according to claim 1, characterized in that: After adjusting the output voltage of the power supply to the desired output voltage, the method further includes: Obtain the inlet dust concentration, inlet flue gas flow rate, outlet dust concentration and outlet flue gas flow rate of the electric bag composite dust collector; The dust removal quality evaluation value of the electric bag composite dust collector is calculated based on the inlet dust concentration, inlet flue gas flow rate, outlet dust concentration and outlet flue gas flow rate of the electric bag composite dust collector; If the dust removal quality assessment value is lower than a preset quality threshold, the load-current limit curve is corrected.

8. The method for controlling the current limit of an electric bag composite dust collector according to claim 7, characterized in that: The load-current limit curve is corrected, including: Obtain the measured load data of the thermal unit and the measured operation data of the electric bag composite dust collector; Comparing the measured load data and the measured operation data with their corresponding standard reference data to obtain a comparison result; Determine the root cause of the dust removal error based on the comparison result; According to the dust removal error root cause, at least part of the data points in the load-current limit curve are adjusted to correct the load-current limit curve.

9. The method for controlling the current limit of an electric bag composite dust collector according to claim 8, characterized in that: According to the dust removal error root cause, at least some data points in the load-current limit curve are adjusted, including: Determine a target data point in the load-current limit curve corresponding to the measured load data, and determine a preset number of adjacent data points on both sides of the target data point; Determine a numerical adjustment coefficient corresponding to the current limit according to the dust removal error root cause; According to the numerical adjustment coefficient, the current limits of the target data point and a plurality of adjacent data points are adjusted respectively.

10. A control device for the current limit of an electric bag composite dust collector, characterized in that: The electric bag composite dust collector is connected to the thermal unit and the power supply respectively, and the device comprises: An acquisition module is used to obtain the measured load data of the thermal unit under the current working conditions; A first processing module is used to determine the expected current limit of the electric bag composite dust collector under the current working conditions according to the measured load data and the pre-established load-current limit curve; A second processing module, configured to determine an expected output voltage of the power supply according to the expected current limit when the expected current limit is within a preset safety margin range; The control module is used to adjust the output voltage of the power supply to the desired output voltage so as to control the electric bag composite dust collector to operate under the desired current limit.

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