Multi-mode compound pulse generation method, electric precipitation system, equipment and storage medium

Abstract

The invention discloses a multi-mode compound pulse generation method, an electric precipitation system, equipment and a storage medium. The multi-mode compound pulse generation method comprises the following steps: acquiring critical electric field intensity, resistivity, current density and relative dielectric constant of a dust layer; calculating a discharge time constant of the dust layer according to the resistivity of the dust layer and the relative dielectric constant of the dust layer; calculating the critical time required for reaching the critical electric field intensity according to the discharge time constant of the dust layer, the critical electric field intensity of the dust layer, the resistivity of the dust layer and the current density of the dust layer; generating a multi-mode compound pulse according to the discharge time constant and the critical time; wherein the output time of the basic voltage is greater than or equal to the discharge time constant, and the output time of the pulse voltage is less than the critical time. According to the multi-mode compound pulse generation method provided by the embodiment of the invention, different multi-mode compound pulses can be generated according to the operation condition of the electric precipitation system, so that the electric precipitation system is prevented from generating back corona, and the precipitation efficiency of the electric precipitation system is improved.

Description

Technical Field

[0001] The present invention relates to the field of dust removal technology, and in particular to a multi-mode compound pulse generation method, an electrostatic precipitator system, equipment and a storage medium. Background Art

[0002] The electrostatic precipitator system is the leading technical equipment for the efficient treatment of flue gas dust in coal-fired power plants, metallurgy, building materials, chemical industry and other industries. As the core equipment of the electrostatic precipitator system, the high-voltage power supply plays an extremely important supporting role in the industry's energy conservation and emission reduction. The working principle of the electrostatic precipitator system is that the dust removal high-voltage power supply applies a high DC voltage between the discharge electrode and the dust collecting electrode to stimulate negative polarity corona discharge, thereby generating dense ions. When the dust-laden flue gas passes through the electric field, the dust particles are charged and separated from the airflow under the action of the electric field, migrate to the dust collecting electrode and deposit, and finally the dust on the dust collecting electrode is removed by physical methods such as vibration.

[0003] The conductivity of dust has a significant impact on the effect of electrostatic precipitator. If the dust is a good conductor, it will not affect the stability of corona discharge; on the contrary, high resistivity dust is prone to charge accumulation and is difficult to release. As the dust layer thickens, the charge release becomes increasingly difficult. At this time, on the one hand, the dust layer fails to release all the charges, and the surface maintains the same polarity as the corona electrode, repelling subsequent charged dust. On the other hand, due to the slow charge release, a significant potential gradient is formed between the dust. When the electric field strength exceeds the critical value, local breakdown will occur inside the dust layer, generating positive ions of reverse polarity. These positive ions move toward the corona electrode and neutralize the negatively charged particles, which is the back corona phenomenon, resulting in a significant deterioration in the efficiency of the electrostatic precipitator system. Summary of the invention

[0004] The present invention provides a multi-mode compound pulse generation method, an electrostatic precipitator system, equipment and a storage medium to avoid the electrostatic precipitator system from generating back corona and improve the dust removal efficiency of the electrostatic precipitator system.

[0005] According to one aspect of the present invention, a multi-mode compound pulse generation method is provided, which is applied to an electrostatic precipitator system, wherein the electrostatic precipitator system removes dust by using a multi-mode compound pulse, wherein the multi-mode compound pulse of the electrostatic precipitator system includes a basic voltage and a pulse voltage that alternate with each other, wherein the voltage value of the basic voltage is less than the voltage value of the pulse voltage; the multi-mode compound pulse generation method includes:

[0006] Obtain the critical electric field strength, resistivity, current density and relative dielectric constant of the dust layer;

[0007] Calculating a discharge time constant of the dust layer according to the resistivity of the dust layer and the relative dielectric constant of the dust layer;

[0008] Calculating a critical time required to reach the critical electric field strength according to a discharge time constant of the dust layer, a critical electric field strength of the dust layer, a resistivity of the dust layer, and a current density of the dust layer;

[0009] A multi-mode compound pulse is generated according to the discharge time constant and the critical time; wherein the output time of the basic voltage is greater than or equal to the discharge time constant, and the output time of the pulse voltage is less than the critical time.

[0010] Optionally, the specific method for obtaining the critical electric field strength of the dust layer includes:

[0011] Obtaining the voltage average value and the current average value of the multi-mode compound pulse of the electrostatic precipitator system in multiple continuous times;

[0012] Determine the volt-ampere curve of the electrostatic precipitator system during dust removal according to the voltage average value and the current average value;

[0013] The critical electric field strength of the dust layer is determined according to the voltammetric curve.

[0014] Optionally, the specific method for obtaining the critical electric field strength of the dust layer includes:

[0015] Obtaining the critical current density when the dust layer breaks down;

[0016] The critical electric field intensity of the dust layer is calculated according to the critical current density of the dust layer and the resistivity of the dust layer.

[0017] Optionally, after generating a multi-mode compound pulse according to the discharge time constant and the critical time, the method further includes:

[0018] Obtaining the dust concentration emitted by the electrostatic precipitator system;

[0019] Determining the maximum output time of the basic voltage in the multi-mode compound pulse according to the emission dust concentration and the preset emission concentration;

[0020] The maximum output time of the basic voltage is used as the actual output time of the basic voltage in the multi-mode compound pulse to correct the multi-mode compound pulse.

[0021] Optionally, the specific method for determining the maximum output time of the basic voltage in the multi-mode compound pulse according to the emission dust concentration and the preset emission concentration includes:

[0022] If the dust emission concentration is less than the preset emission concentration, increasing the output time of the basic voltage, and taking the output time of the basic voltage when the dust emission concentration is equal to the preset emission concentration as the maximum output time;

[0023] If the dust emission concentration is greater than the preset emission concentration, the output time of the basic voltage is reduced, and the output time of the basic voltage when the dust emission concentration is equal to the preset emission concentration is used as the maximum output time;

[0024] If the dust emission concentration is equal to the preset emission concentration, the current output time of the basic voltage is used as the maximum output time.

[0025] According to another aspect of the present invention, an electrostatic precipitator system is also provided, the electrostatic precipitator system comprising: a variable frequency power supply module and a dust removal module;

[0026] The variable frequency power supply module is connected to the dust removal module;

[0027] The variable frequency power supply module is used to execute the multi-mode compound pulse generation method described in any of the above embodiments; the dust removal module is used to perform dust removal according to the multi-mode compound pulse generated by the variable frequency power supply module.

[0028] Optionally, the variable frequency power supply module comprises: a frequency conversion unit and a control unit;

[0029] The frequency conversion unit is connected to the dust removal module, and is also connected to the control unit; the control unit is used to control the frequency conversion unit to generate the multi-mode compound pulse.

[0030] Optionally, the variable frequency power supply module further includes: a collection unit;

[0031] The collection unit is connected to the dust removal module, and the collection unit is also connected to the control unit;

[0032] The collecting unit is used to collect the dust concentration emitted by the electrostatic precipitator system.

[0033] According to another aspect of the present invention, a multi-mode complex pulse generating device is provided, the multi-mode complex pulse generating device comprising:

[0034] at least one processor; and

[0035] a memory communicatively connected to the at least one processor; wherein,

[0036] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the multi-mode complex pulse generation method described in any of the above embodiments.

[0037] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the multi-mode complex pulse generation method described in any of the above embodiments when executed.

[0038] The embodiment of the present invention calculates the discharge time constant of the dust layer according to the resistivity of the dust layer and the relative dielectric constant of the dust layer, calculates the critical time required to reach the critical electric field strength according to the discharge time constant of the dust layer, the critical electric field strength of the dust layer, the resistivity of the dust layer and the current density of the dust layer, and generates a multi-mode compound pulse according to the discharge time constant and the critical time. The output time of the pulse voltage in the multi-mode compound pulse of this embodiment is less than the generation time of the critical electric field strength, and the output time of the basic voltage is greater than or equal to the charge release time of the dust layer. It can generate different multi-mode compound pulses according to the fluctuation of the operating conditions of the electrostatic precipitator system, which is beneficial to avoid the electrostatic precipitator system from generating back corona and improve the dust removal efficiency of the electrostatic precipitator system.

[0039] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 is a flow chart of a multi-mode compound pulse generation method provided by an embodiment of the present invention;

[0042] Figure 2 is an equivalent circuit diagram of a dust layer provided by an embodiment of the present invention;

[0043] Figure 3 is a waveform diagram of a multi-mode compound pulse provided by an embodiment of the present invention;

[0044] Figure 4 is a flow chart of a method for obtaining the critical electric field strength of a dust layer provided by an embodiment of the present invention;

[0045] Figure 5 is a volt-ampere curve diagram of an electrostatic precipitator system during dust removal provided by an embodiment of the present invention;

[0046] Figure 6is a flow chart of a method for obtaining the critical electric field strength of a dust layer provided by an embodiment of the present invention;

[0047] Figure 7 is a flow chart of another multi-mode complex pulse generation method provided by an embodiment of the present invention;

[0048] Figure 8 is a schematic diagram of an electrostatic precipitator system provided by an embodiment of the present invention;

[0049] Fig. 9 It is a structural schematic diagram of a multi-mode compound pulse generating device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 should fall within the scope of protection of the present invention.

[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] The embodiment of the present invention provides a multi-mode compound pulse generation method. The multi-mode compound pulse generation method is applied to an electrostatic precipitator system, which removes dust through a multi-mode compound pulse. The output time of the pulse voltage in the multi-mode compound pulse of this embodiment is less than the generation time of the critical electric field strength, and the output time of the basic voltage is greater than the charge release time of the dust layer, which is beneficial to avoid the generation of back corona in the electrostatic precipitator system and improve the dust removal efficiency of the electrostatic precipitator system. Figure 1 1 is a flow chart of a multi-mode compound pulse generation method provided by an embodiment of the present invention. Figure 1 , the multi-mode compound pulse generation method comprises:

[0053] S110. Obtain the critical electric field strength, resistivity, current density and relative dielectric constant of the dust layer.

[0054] Specifically, the critical electric field strength of the dust layer refers to the electric field strength required for the dust layer to reach the back corona state in the electrostatic precipitator system. When the electric field strength reaches or exceeds this critical value, the dust layer will undergo local breakdown, resulting in a decrease in the efficiency of the electrostatic precipitator system. The relative dielectric constant of the dust layer is a physical parameter that characterizes the dielectric properties or polarization properties of the dust layer. For example, the relative dielectric constant of general industrial dust is between 2 and 3. The resistivity of the dust layer is a physical quantity that characterizes the resistance characteristics of the dust layer. The current density of the dust layer is the current intensity passing through the dust layer per unit cross-sectional area or per unit area.

[0055] Among them, the critical electric field strength, resistivity and current density of the dust layer are all related to the thickness of the dust layer in the electrostatic precipitator system. Therefore, in practical applications, it is necessary to measure and obtain the critical electric field strength, resistivity and current density of the dust layer after the electrostatic precipitator system is started.

[0056] S120. Calculate a discharge time constant of the dust layer according to the resistivity of the dust layer and the relative dielectric constant of the dust layer.

[0057] Specifically, when dust is collected and accumulated on the plates of the electrostatic precipitator system, the dust layer plays an insulating role. Therefore, the dust layer can be equivalent to a circuit in which a resistor and a capacitor are connected in parallel. Figure 2 is an equivalent circuit diagram of a dust layer provided by an embodiment of the present invention. The discharge time constant is the time constant required for all the charges of the dust layer to be released. Figure 2 , the discharge time constant can be calculated by the equivalent capacitance and resistance. The resistance in the equivalent circuit diagram can be calculated by multiplying the relative dielectric constant of the dust layer, the vacuum dielectric constant and the area of ​​the dust layer by the distance between the plates of the electrostatic precipitator system. The capacitance in the equivalent circuit diagram can be calculated by multiplying the specific resistance of the dust layer and the distance between the plates of the electrostatic precipitator system by the area of ​​the dust layer. Among them, the vacuum dielectric constant is 8.854187817×10 -12 F / m, the specific resistance of the dust layer can be obtained according to the resistivity of the dust layer. It should be noted that the reciprocal of the specific resistance is the resistivity. Therefore, the discharge time constant can be calculated by the following formula:

[0058] t0=8.85ρε r ×10 -14 ;

[0059] Among them, t0 is the discharge time constant; ρ is the specific resistance of the dust layer; ε r is the relative dielectric constant of the dust layer.

[0060] S130, calculating a critical time required to reach a critical electric field strength according to a discharge time constant of the dust layer, a critical electric field strength of the dust layer, a resistivity of the dust layer, and a current density of the dust layer.

[0061] Specifically, the critical time required to reach the critical electric field strength can be calculated by the following formula:

[0062]

[0063] Among them, t1 is the critical time; t0 is the discharge time constant; E d is the critical electric field strength of the dust layer; ρ is the specific resistance of the dust layer; I0 is the current density of the dust layer.

[0064] S140, generating a multi-mode compound pulse according to a discharge time constant and a critical time; wherein the output time of the basic voltage is greater than or equal to the discharge time constant, and the output time of the pulse voltage is less than the critical time.

[0065] Specifically, the intensity of the electric field between the two plates of the electrostatic precipitator system gradually increases under the action of the pulse voltage, and the intensity of the electric field between the two plates of the electrostatic precipitator system gradually decreases under the action of the basic voltage. The discharge time constant is the time constant required for all the charges of the dust layer to be released. That is to say, when the output time of the basic voltage is greater than or equal to the discharge time constant, the intensity of the electric field between the two plates of the electrostatic precipitator system gradually decreases from the critical electric field intensity to the electric field intensity provided by the basic voltage. Therefore, by controlling the output time of the basic voltage to be greater than or equal to the discharge time constant, the output time of the pulse voltage is less than the critical time, and the electrostatic precipitator system can be suppressed from generating back corona. In other words, the multi-mode compound pulse required for dust removal by the electrostatic precipitator system can be produced according to the working conditions of the electrostatic precipitator system to adapt to different dust removal environments or emission standards. Exemplarily, the output time of the pulse voltage and the output time of the basic voltage in the multi-mode compound pulse can be controlled by a PWM (Pulse Width Modulation) signal or an SPWM (Sine pulse width modulation) signal. Figure 3 is a waveform diagram of a multi-mode compound pulse provided by an embodiment of the present invention. Figure 3 , wherein the multi-mode compound pulse of the electrostatic precipitator system includes a basic voltage and a pulse voltage that alternate with each other, and the voltage value of the basic voltage is smaller than the voltage value of the pulse voltage.

[0066] The embodiment of the present invention calculates the discharge time constant of the dust layer according to the resistivity of the dust layer and the relative dielectric constant of the dust layer, calculates the critical time required to reach the critical electric field strength according to the discharge time constant of the dust layer, the critical electric field strength of the dust layer, the resistivity of the dust layer and the current density of the dust layer, and generates a multi-mode compound pulse according to the discharge time constant and the critical time. The output time of the pulse voltage in the multi-mode compound pulse of this embodiment is less than the generation time of the critical electric field strength, and the output time of the basic voltage is greater than or equal to the charge release time of the dust layer. It can generate different multi-mode compound pulses according to the fluctuation of the operating conditions of the electrostatic precipitator system, which is beneficial to avoid the electrostatic precipitator system from generating back corona and improve the dust removal efficiency of the electrostatic precipitator system.

[0067] Figure 4 is a flow chart of a method for obtaining the critical electric field strength of a dust layer provided by an embodiment of the present invention. Based on the above embodiment, optionally, refer to Figure 4 , the specific methods for obtaining the critical electric field strength of the dust layer include:

[0068] S111. Obtaining the average voltage and average current of the multi-mode compound pulses of the electrostatic precipitator system in multiple continuous time periods.

[0069] Specifically, after the electrostatic precipitator system is started, the electrostatic precipitator system generates a multi-mode compound pulse to perform dust removal. Since the voltage generated by the electrostatic precipitator system during operation is fluctuating, the voltage and current values ​​at different times do not change linearly. Therefore, the mean value of the voltage and the mean value of the current generated by the electrostatic precipitator system in a continuous period of time are calculated, and the voltage mean and the current mean are used as the point value of the electrostatic precipitator system during the period of time. Exemplarily, when calculating the mean value of the voltage and the mean value of the current generated by the electrostatic precipitator system in a continuous period of time, the voltage and current of the multi-mode compound pulse of the electrostatic precipitator system can be collected according to a preset frequency, and the voltage mean is calculated according to the sum of each voltage and the number of collected voltages. The current mean is calculated in the same way as the voltage mean, which will not be repeated here.

[0070] S112. Determine the volt-ampere curve of the electrostatic precipitator system during dust removal based on the average voltage and the average current.

[0071] Figure 5 This is a volt-ampere curve diagram of an electrostatic precipitator system during dust removal provided by an embodiment of the present invention. Figure 5 Specifically, the voltage average value and the current average value correspond one to one, and the volt-ampere curve of the electrostatic precipitator system during dust removal can be drawn based on the obtained voltage average value and current average value.

[0072] S113. Determine the critical electric field strength of the dust layer based on the volt-ampere curve.

[0073] Specifically, when back corona occurs in the electrostatic precipitator system, due to the influence of the back corona of the dust layer, the voltage between the two plates of the electrostatic precipitator system is partially offset by the reverse voltage of the dust layer, and the voltage between the two plates of the electrostatic precipitator system rises slowly or even stops rising. This is reflected in the volt-ampere curve as an inflection point on the curve, and the critical electric field strength of the dust layer can be obtained based on the voltage corresponding to the inflection point.

[0074] Figure 6 is a flow chart of a method for obtaining the critical electric field strength of a dust layer provided by an embodiment of the present invention. Figure 6 , the specific methods for obtaining the critical electric field strength of the dust layer include:

[0075] S114. Obtain the critical current density when the dust layer breaks down.

[0076] Specifically, dust layer breakdown refers to the phenomenon that under certain conditions, when the electric field strength is high enough, the dust layer loses its insulation properties and breaks down to conduct electricity. Critical current density refers to the current passing through the dust layer per unit area when the dust layer breaks down.

[0077] S115. Calculate the critical electric field strength of the dust layer according to the critical current density of the dust layer and the resistivity of the dust layer.

[0078] Specifically, according to the integral form of Ohm's law:

[0079] Ed = jdρ;

[0080] Wherein, Ed is the critical electric field strength of the dust layer; jd is the critical current density; ρ is the resistivity of the dust layer.

[0081] Figure 7 is a flowchart of another multi-mode compound pulse generation method provided by an embodiment of the present invention. Based on the above embodiments, optionally, refer to Figure 7 , after generating a multi-mode compound pulse according to the discharge time constant and the critical time, it also includes:

[0082] S150. Obtain the dust concentration emitted by the electrostatic precipitator system.

[0083] Specifically, the dust emission concentration is the concentration of dust output from the outlet of the electrostatic precipitator system after the electrostatic precipitator system removes dust. Exemplarily, the dust emission concentration can be detected by a turbidity meter.

[0084] S160. Determine the maximum output time of the basic voltage in the multi-mode compound pulse according to the emission dust concentration and the preset emission concentration.

[0085] Specifically, when the dust emission concentration is less than the preset emission concentration, the output time of the basic voltage is increased, and the output time of the basic voltage when the dust emission concentration is equal to the preset emission concentration is used as the maximum output time; when the dust emission concentration is greater than the preset emission concentration, the output time of the basic voltage is reduced, and the output time of the basic voltage when the dust emission concentration is equal to the preset emission concentration is used as the maximum output time; when the dust emission concentration is equal to the preset emission concentration, the current output time of the basic voltage is used as the maximum output time. It should be noted that the preset emission concentration is the maximum dust emission concentration of the electrostatic precipitator system that is preset, and can be set according to actual needs in actual application, and this embodiment does not limit this.

[0086] S170: Taking the maximum output time of the basic voltage as the actual output time of the basic voltage in the multi-mode compound pulse, so as to correct the multi-mode compound pulse.

[0087] Specifically, the intensity of the electric field between the two plates of the electrostatic precipitator system gradually increases under the action of the pulse voltage, and the intensity of the electric field between the two plates of the electrostatic precipitator system gradually decreases under the action of the basic voltage. Under the basic voltage, the intensity of the electric field between the two plates of the electrostatic precipitator system decreases, the adsorption effect of the electrostatic precipitator system on dust decreases, and the dust concentration of the electrostatic precipitator system increases.

[0088] On the basis of the above, according to the Doychi formula of electrostatic precipitator collection efficiency:

[0089]

[0090] Among them, e is a constant, A is the plate area; Q is the flue gas volume; ω is the dust driving speed; η is the electrostatic precipitator capture efficiency.

[0091] It can be seen that the electrostatic precipitator collection efficiency is positively correlated with the dust driving speed. According to the dust driving speed calculation formula:

[0092] ω=β·V p ·V m ;

[0093] Among them, ω is the dust driving speed; β is a constant, Vp is the peak value of the pulse voltage, and Vm is the average value of the basic voltage.

[0094] It can be seen that the dust driving speed is positively correlated to the product of the pulse voltage peak value and the basic voltage average value. However, the smaller the basic voltage average value, the smaller the power of the electrostatic precipitator system. Therefore, while ensuring that the electrostatic precipitator collection efficiency remains unchanged, reducing the basic voltage average value and increasing the pulse voltage peak value can further reduce the power of the electrostatic precipitator system. It should be noted that the basic voltage average value is related to the output time of the basic voltage and the voltage value of the basic voltage.

[0095] An embodiment of the present invention also provides an electrostatic precipitator system. Figure 8 Schematic diagram of an electrostatic precipitator system provided by an embodiment of the present invention. Figure 8 The electrostatic precipitator system includes: a variable frequency power supply module 110 and a dust removal module 120.

[0096] The variable frequency power supply module 110 is connected to the dust removal module 120; the variable frequency power supply module 110 is used to execute the multi-mode compound pulse generation method provided in any of the above embodiments; the dust removal module 120 is used to perform dust removal according to the multi-mode compound pulse generated by the variable frequency power supply module 110.

[0097] Among them, the electrostatic precipitator system provided in the embodiment of the present invention has the beneficial effects of the multi-mode compound pulse generation method provided in any of the above embodiments, which will not be repeated here.

[0098] Based on the above embodiment, optionally, continue to refer to Figure 8 The variable frequency power supply module 110 includes: a frequency conversion unit 111 and a control unit 112 .

[0099] The frequency conversion unit 111 is connected to the dust removal module 120 , and is also connected to the control unit 112 ; the control unit 112 is used to control the frequency conversion unit 111 to generate multi-mode compound pulses.

[0100] Specifically, the frequency conversion unit 111 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a capacitor C, an inductor L, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a transformer T, a rectifier bridge B, a first resistor R1, a second resistor R2 and a third resistor R3.

[0101] The anode terminal of the first diode D1 is connected to the cathode terminal of the second diode D2, the anode terminal of the first diode D1 is also connected to the U phase, the cathode terminal of the first diode D1 is connected to the cathode terminal of the third diode D3, the anode terminal of the third diode D3 is connected to the cathode terminal of the fourth diode D4, the anode terminal of the third diode D3 is also connected to the V phase, the anode terminal of the fourth diode D4 is connected to the anode terminal of the second diode D2, the cathode terminal of the third diode D3 is also connected to the cathode terminal of the fifth diode D5, the anode terminal of the fifth diode D5 is connected to the sixth diode D4. The cathode end of the sixth diode D6 is connected to the anode end of the fourth diode D4, the anode end of the sixth diode D6 is also connected to the first end of the capacitor C, the second end of the capacitor C is connected to the first end of the inductor L, the second end of the inductor L is connected to the cathode end of the fifth diode D5, the input end of the first switch tube Q1 is connected to the first end of the inductor L, the output end of the first switch tube Q1 is connected to the input end of the second switch tube Q2, the output end of the second switch tube Q2 is connected to the first end of the capacitor C, the input end of the third switch tube Q3 ... The input end of the switch tube Q1 is connected, the output end of the third switch tube Q3 is connected to the input end of the fourth switch tube Q4, the output end of the fourth switch tube Q4 is connected to the output end of the second switch tube Q2, the control end of the first switch tube Q1, the control end of the second switch tube Q2, the control end of the third switch tube Q3, and the control end of the fourth switch tube Q4 are all connected to the control unit 112, the first end of the transformer T is connected to the output end of the third switch tube Q3, the second end of the transformer T is connected to the output end of the first switch tube Q1, and the third end of the transformer T is connected to the output end of the rectifier bridge B. The first end of the transformer T is connected to the second end of the rectifier bridge B, the third end of the rectifier bridge B is connected to the first end of the first resistor R1, the second end of the first resistor R1 is grounded, the first end of the first resistor R1 is also connected to the control unit 112, the first end of the second resistor R2 is connected to the fourth end of the rectifier bridge B, the second end of the second resistor R2 is connected to the first end of the third resistor R3, the second end of the second resistor R2 is also connected to the control unit 112, the second end of the third resistor R3 is grounded, and the fourth end of the rectifier bridge B is also connected to the dust removal module 120. Among them, the U phase, the V phase and the W phase are three phases of the external power supply (such as industrial electricity).

[0102] Based on the above embodiment, optionally, continue to refer to Figure 8 The variable frequency power supply module 110 further includes: a collection unit 113 .

[0103] The collection unit 113 is connected to the dust removal module 120, and is also connected to the control unit 112. The collection unit 113 is used to collect the dust concentration emitted by the electrostatic precipitator system. For example, the collection unit 113 can be a turbidity meter.

[0104] Fig. 9: is a structural schematic diagram of a multi-mode complex pulse generating device provided by an embodiment of the present invention. The multi-mode complex pulse generating device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The multi-mode complex pulse generating device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0105] like Fig. 9 As shown, the multi-mode complex pulse generating device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the multi-mode complex pulse generating device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0106] Multiple components in the multi-mode complex pulse generating device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the multi-mode complex pulse generating device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0107] The processor 11 may be a variety of general and / or dedicated processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, such as a multi-mode complex pulse generation method.

[0108] In some embodiments, the multi-mode complex pulse generation method may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the multi-mode complex pulse generation device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the multi-mode complex pulse generation method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute the multi-mode complex pulse generation method in any other appropriate manner (e.g., by means of firmware).

[0109] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0110] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0111] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0112] To provide interaction with a user, the systems and techniques described herein may be implemented on a multi-mode complex pulse generating device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the multi-mode complex pulse generating device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0113] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0114] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0115] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0116] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-mode complex pulse generation method, characterized in that: Applied to an electrostatic precipitator system, the electrostatic precipitator system removes dust through a multi-mode compound pulse, the multi-mode compound pulse of the electrostatic precipitator system includes a basic voltage and a pulse voltage that alternate with each other, and the voltage value of the basic voltage is less than the voltage value of the pulse voltage; The multi-mode complex pulse generation method comprises: Obtain the critical electric field strength, resistivity, current density and relative dielectric constant of the dust layer; Calculating a discharge time constant of the dust layer according to the resistivity of the dust layer and the relative dielectric constant of the dust layer; Calculating a critical time required to reach the critical electric field strength according to a discharge time constant of the dust layer, a critical electric field strength of the dust layer, a resistivity of the dust layer, and a current density of the dust layer; A multi-mode compound pulse is generated according to the discharge time constant and the critical time; wherein the output time of the basic voltage is greater than or equal to the discharge time constant, and the output time of the pulse voltage is less than the critical time.

2. The multi-mode compound pulse generation method according to claim 1, characterized in that: The specific methods for obtaining the critical electric field strength of the dust layer include: Obtaining the voltage average value and the current average value of the multi-mode compound pulse of the electrostatic precipitator system in multiple continuous times; Determine the volt-ampere curve of the electrostatic precipitator system during dust removal according to the voltage average value and the current average value; The critical electric field strength of the dust layer is determined according to the voltammetric curve.

3. The multi-mode compound pulse generation method according to claim 1, characterized in that: The specific methods for obtaining the critical electric field strength of the dust layer include: Obtaining the critical current density when the dust layer breaks down; The critical electric field intensity of the dust layer is calculated according to the critical current density of the dust layer and the resistivity of the dust layer.

4. The multi-mode compound pulse generation method according to claim 1, characterized in that: After generating a multi-mode compound pulse according to the discharge time constant and the critical time, the method further includes: Obtaining the dust concentration emitted by the electrostatic precipitator system; Determining the maximum output time of the basic voltage in the multi-mode compound pulse according to the emission dust concentration and the preset emission concentration; The maximum output time of the basic voltage is used as the actual output time of the basic voltage in the multi-mode compound pulse to correct the multi-mode compound pulse.

5. The multi-mode compound pulse generation method according to claim 4, characterized in that: The specific method for determining the maximum output time of the basic voltage in the multi-mode compound pulse according to the emission dust concentration and the preset emission concentration includes: If the dust emission concentration is less than the preset emission concentration, increasing the output time of the basic voltage, and taking the output time of the basic voltage when the dust emission concentration is equal to the preset emission concentration as the maximum output time; If the dust emission concentration is greater than the preset emission concentration, the output time of the basic voltage is reduced, and the output time of the basic voltage when the dust emission concentration is equal to the preset emission concentration is used as the maximum output time; If the dust emission concentration is equal to the preset emission concentration, the current output time of the basic voltage is used as the maximum output time.

6. An electrostatic precipitator system, characterized in that: The electrostatic precipitator system comprises: a variable frequency power supply module and a dust removal module; The variable frequency power supply module is connected to the dust removal module; The variable frequency power supply module is used to execute the multi-mode compound pulse generation method as described in any one of claims 1 to 5; the dust removal module is used to perform dust removal according to the multi-mode compound pulse generated by the variable frequency power supply module.

7. The electrostatic precipitator system according to claim 6, characterized in that: The variable frequency power supply module comprises: a frequency conversion unit and a control unit; The frequency conversion unit is connected to the dust removal module, and is also connected to the control unit; the control unit is used to control the frequency conversion unit to generate the multi-mode compound pulse.

8. The electrostatic precipitator system according to claim 7, characterized in that: The variable frequency power supply module also includes: a collection unit; The collection unit is connected to the dust removal module, and the collection unit is also connected to the control unit; The collecting unit is used to collect the dust concentration emitted by the electrostatic precipitator system.

9. A multi-mode complex pulse generating device, characterized in that: The multi-mode complex pulse generating device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the multi-mode complex pulse generation method according to any one of claims 1 to 5.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the multi-mode complex pulse generation method according to any one of claims 1 to 5 when executed.

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