Low-temperature electric dust collector rapping method and system

Abstract

This invention provides a method and system for rapping a low-temperature electrostatic precipitator, belonging to the field of electrostatic precipitator technology. The method includes: S10) collecting ash accumulation parameters at the start-up time of the electrostatic precipitator; S20) determining the current rotation cycle of the rapping shaft based on the ash accumulation parameters at the start-up time, and controlling the rotation of the rapping shaft based on the current rotation cycle for rapping; S30) collecting real-time ash accumulation parameters of the electrostatic precipitator, and determining the next rapping time based on the real-time ash accumulation parameters; S40) at the determined next rapping time, determining the next rotation cycle of the rapping shaft based on the ash accumulation parameters at that time, and controlling the rotation of the rapping shaft based on the next rotation cycle for rapping; S50) repeating steps S30)-S40) to perform cyclic rapping of the electrostatic precipitator. This invention reduces secondary dust generation during the rapping process while ensuring the dust removal performance of the low-temperature electrostatic precipitator.

Description

Technical Field

[0001] This invention relates to the field of electrostatic precipitator technology, specifically to a vibration method and a vibration system for a low-temperature electrostatic precipitator. Background Technology

[0002] Electrostatic precipitators (ESPs) in coal-fired power plants, especially low-temperature ESPs, reduce the inlet flue gas temperature below the acid dew point using flue gas coolers or flue gas heat exchange systems (including flue gas coolers and reheaters). The minimum temperature should meet the process temperature requirements of wet desulfurization systems, generally around 90°C. This causes most of the SO3 in the flue gas to condense into sulfuric acid mist in the flue gas cooler and adhere to the dust surface, significantly altering the dust properties, reducing dust resistivity, avoiding back corona discharge, and greatly improving dust removal efficiency while removing most of the SO3. This technology has become the preferred environmental dust removal process for coal-fired power plants and can also be optimized and combined with other mature technologies, leading to increasingly widespread applications.

[0003] Lower dust resistivity improves dust collection efficiency, but it also weakens the electrostatic adhesion of dust collected on the anode plate, leading to a slight increase in secondary dust re-entrainment compared to conventional electrostatic precipitators. Experimental studies show that although the significant reduction in dust resistivity in low-temperature electrostatic precipitators eliminates the back corona phenomenon, secondary dust re-entrainment increases. Compared to conventional electrostatic precipitators where the majority of particles are not collected from the primary source, secondary dust is the main component in low-temperature electrostatic precipitators. However, by taking appropriate measures, low dust concentrations can be achieved. To address the secondary dust re-entrainment problem caused by lower dust resistivity in current low-temperature electrostatic precipitators, a new vibration method for low-temperature electrostatic precipitators needs to be developed. Summary of the Invention

[0004] The purpose of this invention is to provide a vibration method and system for low-temperature electrostatic precipitators, so as to at least solve the problem of secondary dust generation caused by the reduction of dust resistivity in current low-temperature electrostatic precipitators.

[0005] To achieve the above objectives, the first aspect of the present invention provides a method for rapping a low-temperature electrostatic precipitator, the method comprising: S10) collecting ash accumulation parameters at the start-up time of the electrostatic precipitator; S20) determining the rotation cycle of the current rapping shaft based on the ash accumulation parameters at the start-up time of the electrostatic precipitator, and controlling the rotation of the rapping shaft to perform rapping based on the rotation cycle of the current rapping shaft; S30) collecting real-time ash accumulation parameters of the electrostatic precipitator, and determining the next rapping time based on the real-time ash accumulation parameters; S40) at the determined next rapping time, determining the next rotation cycle of the rapping shaft based on the ash accumulation parameters of the electrostatic precipitator at that time, and controlling the rotation of the rapping shaft to perform rapping based on the rotation cycle of the next rapping shaft; S50) repeating steps S30)-S40) to perform cyclic rapping of the electrostatic precipitator.

[0006] Optionally, the dust accumulation parameters of the electrostatic precipitator include: dust thickness of the dust collector, dust collection area of ​​the final electric field, dust concentration at the inlet of the electrostatic precipitator, dust concentration at the inlet of the final electric field, and dust concentration at the outlet of the final electric field.

[0007] Optionally, the rule for determining the rotation period of the rapping shaft is as follows:

[0008]

[0009] Where T is the rotation period of the rapping shaft; n is the dust thickness of the ash collector; A is the dust collection area of ​​the final electric field; Q is the dust concentration at the inlet of the electrostatic precipitator; m1 is the dust concentration at the inlet of the final electric field; m2 is the dust concentration at the outlet of the final electric field; k is the preset conversion factor for dust viscosity and resistivity; and ρ is the preset coal ash bulk density.

[0010] Optionally, controlling the rotation of the vibrating shaft based on its rotation period for vibrating includes: determining the rotation speed of the vibrating shaft based on its rotation period; determining the rotation speed of the motor driving the vibrating shaft based on its rotation speed; and controlling the operation of the corresponding motor based on the determined motor speed.

[0011] Optionally, determining the next rapping time based on real-time dust accumulation parameters includes: comparing the dust thickness of the dust collector in the real-time dust accumulation parameters with the preset rapping dust thickness; when the dust thickness of the dust collector is equal to or greater than the preset rapping dust thickness, the corresponding time is determined as the next rapping time.

[0012] Optionally, the method further includes: correcting the timing of the next vibration, including: starting the timer from the current vibration completion time, determining the allowable time range of the next vibration time based on the preset vibration interval length; if the determined next vibration time does not fall within the allowable time range, or exceeds the allowable time range and the next vibration time is still not determined, then the next vibration time is corrected based on the allowable time range.

[0013] Optionally, the preset vibration interval time is 60s-300s.

[0014] Optionally, the step of correcting the next vibration time based on the allowed time range includes: if the determined next vibration time does not fall within the allowed time range, then the start time of the allowed time range is determined as the next vibration time; if the next vibration time is still not determined after exceeding the allowed time range, then the end time of the allowed time range is determined as the next vibration time.

[0015] A second aspect of the present invention provides a low-temperature electrostatic precipitator rapping system, the system comprising: a data acquisition unit for acquiring ash accumulation parameters at the start-up time of the electrostatic precipitator; and for acquiring real-time ash accumulation parameters of the electrostatic precipitator; a processing unit for performing the following steps: S1) determining the rotation cycle of the current rapping shaft based on the ash accumulation parameters at the start-up time of the electrostatic precipitator; S2) determining the next rapping time based on the real-time ash accumulation parameters of the electrostatic precipitator; S3) at the determined next rapping time, determining the rotation cycle of the next rapping shaft based on the ash accumulation parameters of the electrostatic precipitator at the corresponding time; S4) repeating steps S2)-S3) to perform cyclic rapping of the electrostatic precipitator; and an execution unit for: controlling the rotation of the rapping shaft to perform rapping based on the current rotation cycle of the rapping shaft; and controlling the rotation of the rapping shaft to perform rapping based on the next rotation cycle of the rapping shaft.

[0016] On the other hand, the present invention provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the above-described low-temperature electrostatic precipitator rapping method.

[0017] Through the above technical solution, the present invention addresses the design of a rapping system for low-temperature electrostatic precipitators. It calculates the optimal rapping shaft rotation cycle for each rapping cycle based on real-time dust accumulation. This design aligns with the dynamic characteristics of dust accumulation in low-temperature electrostatic precipitators. Each rapping moment and rapping shaft rotation cycle is calculated independently, ensuring effective rapping while avoiding frequent rapping, thereby reducing secondary dust generation.

[0018] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a flowchart of the steps of a low-temperature electrostatic precipitator rapping method provided in one embodiment of the present invention;

[0021] Figure 2 This is a system structure diagram of a low-temperature electrostatic precipitator rapping system provided in one embodiment of the present invention. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] Low-temperature electrostatic precipitators reduce the temperature of flue gas to below the acid dew point, approximately 90°C, through a flue gas cooler. They possess the advantages of conventional electrostatic precipitators, such as high dust removal efficiency, low equipment resistance, and large flue gas handling capacity. Furthermore, they overcome the technical bottlenecks of conventional electrostatic precipitators, such as back corona caused by high resistivity and difficulty in charging fine dust particles. They are currently the main supporting technology for the "ultra-low emission" retrofit of coal-fired power plants and have become the mainstream technology for dust control.

[0024] Electrostatic precipitators (ESPs) in coal-fired power plants, especially low-temperature ESPs, reduce the inlet flue gas temperature below the acid dew point using flue gas coolers or flue gas heat exchange systems (including flue gas coolers and reheaters). The minimum temperature should meet the process temperature requirements of wet desulfurization systems, generally around 90°C. This causes most of the SO3 in the flue gas to condense into sulfuric acid mist in the flue gas cooler and adhere to the dust surface, significantly altering the dust properties, reducing dust resistivity, avoiding back corona discharge, and greatly improving dust removal efficiency while removing most of the SO3. This technology has become the preferred environmental dust removal process for coal-fired power plants and can also be optimized and combined with other mature technologies, leading to increasingly widespread applications.

[0025] Lower dust resistivity improves dust collection efficiency, but it also weakens the electrostatic adhesion of dust collected on the anode plate, leading to a slight increase in secondary dust re-entrainment compared to conventional electrostatic precipitators. Experimental studies show that although the significant reduction in dust resistivity in low-temperature electrostatic precipitators eliminates the back corona phenomenon, secondary dust re-entrainment increases. Compared to conventional electrostatic precipitators where the majority of particles are not collected from the primary source, secondary dust re-entrainment is the main component in low-temperature electrostatic precipitators. However, by taking appropriate measures, low dust concentrations can be achieved.

[0026] To address the problem of secondary dust generation caused by reduced dust resistivity in low-temperature electrostatic precipitators, this invention provides a rapping method for such systems. The rapping system design is tailored to the real-time dust accumulation situation, calculating the optimal rapping shaft rotation cycle for each cycle. This method aligns with the dynamic characteristics of dust accumulation in low-temperature electrostatic precipitators, calculating the rapping time and rotation cycle independently for each cycle. This ensures effective rapping while avoiding frequent rapping, thus reducing secondary dust generation.

[0027] Figure 1 This is a flowchart of a low-temperature electrostatic precipitator rapping method according to one embodiment of the present invention. Figure 1 As shown, an embodiment of the present invention provides a method for rapping a low-temperature electrostatic precipitator, the method comprising:

[0028] Step S10: Collect the ash accumulation parameters at the start-up time of the electrostatic precipitator.

[0029] Specifically, as mentioned above, the present invention performs targeted calculations based on real-time dust accumulation parameters during the rapping process. However, during the system startup phase, because the amount of dust accumulated in the electrostatic precipitator during the previous shutdown cannot be guaranteed, a rapping operation is required at startup. Furthermore, precisely because the amount of dust accumulated in the electrostatic precipitator during the previous shutdown is unknown, corresponding dust accumulation data must still be collected during this rapping operation to avoid secondary dust generation.

[0030] Based on this, preferably, the dust accumulation parameters of the electrostatic precipitator include: dust thickness of the dust collector, dust collection area of ​​the final electric field, dust concentration at the inlet of the electrostatic precipitator, dust concentration at the inlet of the final electric field, and dust concentration at the outlet of the final electric field.

[0031] A low-temperature electrostatic precipitator (ESP) is essentially a conventional ESP with a low-temperature heat exchanger at the front end, reducing the inlet flue gas temperature from 140℃ to approximately 90℃. The ESP works by charging the dust particles as they pass through the duct before the main structure. The gas then enters the ESP channel, which contains multiple layers of cathode plates. The positively charged dust particles adhere to the cathode plates due to the mutual attraction between the charged particles and the cathodes. Periodic impacts on the cathode plates cause the dust particles, forming a layer, to fall into the ash hopper below the ESP structure under the combined effects of gravity and vibration, thus removing the dust from the flue gas. The collecting plates connected to the positive terminal of the high-voltage DC power supply are called anode plates. The corona wires connected to the negative terminal of the high-voltage DC power supply are called cathode wires. When an electrostatic precipitator is working, the surfaces of the anode plate and cathode wire will adsorb a certain amount of dust. When this dust reaches a certain thickness, it will affect the further operation of the precipitator if it is not cleaned in time. Therefore, it is necessary to take certain measures to remove the adsorbed dust. Generally, the dust is removed by installing rapping devices on the cathode wire and anode plate respectively.

[0032] Preferably, the vibrating device of the present invention includes a motor, a reducer connected to the motor, a vibrating shaft connected to the reducer, and a plurality of vibrating hammers disposed on the vibrating shaft. The vibrating hammers are equidistantly distributed along the axis of the vibrating shaft, and the included angle between the projections of adjacent vibrating hammers in the radial plane is 15 degrees.

[0033] Step S20: Determine the rotation cycle of the current rapping shaft based on the ash accumulation parameters at the start-up time of the electrostatic precipitator, and control the rotation of the rapping shaft to perform rapping based on the rotation cycle of the current rapping shaft.

[0034] Specifically, after collecting the ash accumulation parameters of the electrostatic precipitator, the rotation cycle of the rapping shaft can be calculated based on these parameters. The calculation rules are as follows:

[0035]

[0036] Where T is the rotation period of the rapping shaft; n is the dust thickness of the ash collector; A is the dust collection area of ​​the final electric field; Q is the dust concentration at the inlet of the electrostatic precipitator; m1 is the dust concentration at the inlet of the final electric field; m2 is the dust concentration at the outlet of the final electric field; k is the preset conversion factor for dust viscosity and resistivity; and ρ is the preset coal ash bulk density.

[0037] After obtaining the rotation period of the rapping shaft, the rapping shaft is controlled to rotate for rapping based on the rotation period, including: determining the rotation speed of the rapping shaft based on the rotation period; determining the rotation speed of the motor that drives the rapping shaft based on the rotation speed; and controlling the operation of the corresponding motor based on the determined motor speed.

[0038] In this embodiment of the invention, calculation rules show that the rapping cycle is positively correlated with dust thickness and negatively correlated with inlet dust concentration. Therefore, the higher the dust content in the flue gas, the shorter the corresponding rapping shaft rotation cycle. Conversely, the greater the dust accumulation, the longer the rotation cycle will be. This is because, logically, when the integrated thickness is large, the corresponding dust adhesion will decrease. If rapping is performed with a very low rotation cycle (the faster the rotation speed), such rapid rapping will inevitably lead to a large amount of secondary dust generation. Based on the actual situation, the rapping shaft rotation cycle is calculated specifically, allowing for targeted rapping based on the actual dust accumulation rate and amount, ensuring minimal secondary dust generation.

[0039] Step S30: Collect the real-time ash accumulation parameters of the electrostatic precipitator, and determine the next rapping time based on the real-time ash accumulation parameters.

[0040] Specifically, by comparing the dust thickness of the dust collector in the real-time dust accumulation parameters with the preset rapping dust thickness, when the dust thickness of the dust collector is equal to or greater than the preset rapping dust thickness, the corresponding time is determined as the time for the next rapping.

[0041] In this embodiment of the invention, the core objective is to minimize secondary dust generation while ensuring dust removal efficiency. There are two main technical means to reduce secondary dust generation: first, by reducing the frequency of rapping to decrease the total amount of secondary dust; and second, by specifically calculating the rotation cycle of the rapping shaft to reduce secondary dust generation during the rapping process. For the first technical means, the timing of the next rapping action is determined, and rapping is only performed when the dust collection conditions meet the rapping requirements.

[0042] In existing technical solutions, automatic vibration is often based on a fixed preset timing sequence. This means that regardless of the dust collection situation, the corresponding vibration shaft rotates and vibrates according to the preset timing, resulting in very low flexibility. Even when the dust accumulation rate is very slow, this method will still vibrate when there is very little dust accumulation, or even when the dust accumulation is rapid and the amount of dust is large, the vibration will not occur before the preset timing. In either case, secondary dust re-entrainment will occur. Therefore, the present invention collects the real-time dust accumulation parameters of the electrostatic precipitator and only performs vibration when these parameters meet the vibration requirements.

[0043] Step S40: At the determined next rapping time, based on the dust accumulation parameters of the electrostatic precipitator at that time, determine the rotation cycle of the rapping shaft for the next rapping, and control the rotation of the rapping shaft to perform rapping based on the rotation cycle of the next rapping shaft.

[0044] Specifically, when the dust thickness in the dust collector is equal to or greater than the preset dust thickness for rapping, the corresponding time is determined as the next rapping time. To avoid secondary dust generation due to excessively short intervals, and to prevent dust removal from being too difficult due to excessively long intervals (greater than 300 seconds), this invention, after determining the next rapping time, will also adjust the next rapping time, including: starting the timer from the current rapping completion time, determining the allowable time range for the next rapping time based on the preset rapping interval length; if the determined next rapping time does not fall within the allowable time range, or exceeds the allowable time range and the next rapping time is still not determined, then the next rapping time is adjusted based on the allowable time range.

[0045] The preset vibration interval time is 60s-300s. The step of correcting the next vibration time based on the allowed time range includes: if the determined next vibration time does not fall within the allowed time range, then the start time of the allowed time range is determined as the next vibration time; if the next vibration time is still not determined after exceeding the allowed time range, then the end time of the allowed time range is determined as the next vibration time.

[0046] Based on the dust accumulation parameters at the next rapping moment after correction, repeat the rule for determining the rotation period in step S20 to determine the rotation period of the rapping axis at the current rapping moment, and then control the rapping axis based on the newly determined rotation period to complete this rapping.

[0047] Step S50: Repeat steps S30)-S40) to perform cyclic vibration of the electrostatic precipitator.

[0048] Specifically, based on the above rules, the determination of the next vibration time and the corresponding vibration shaft rotation cycle for the next vibration time are repeated. Then, each vibration is performed differently, and the amount of secondary dust is reduced by using appropriate vibration frequency and vibration shaft rotation speed.

[0049] Figure 2 This is a system structure diagram of a low-temperature electrostatic precipitator rapping system provided in one embodiment of the present invention. Figure 2 As shown, this invention provides a low-temperature electrostatic precipitator rapping system. The system includes: a data acquisition unit for acquiring ash accumulation parameters at the start-up time of the electrostatic precipitator and for acquiring real-time ash accumulation parameters of the electrostatic precipitator; a processing unit for performing the following steps: S1) determining the rotation cycle of the current rapping shaft based on the ash accumulation parameters at the start-up time of the electrostatic precipitator; S2) determining the next rapping time based on the real-time ash accumulation parameters of the electrostatic precipitator; S3) at the determined next rapping time, determining the next rotation cycle of the rapping shaft based on the ash accumulation parameters of the electrostatic precipitator at the corresponding time; S4) repeating steps S2)-S3) to perform cyclic rapping of the electrostatic precipitator; and an execution unit for: controlling the rotation of the rapping shaft to perform rapping based on the current rotation cycle of the rapping shaft; and controlling the rotation of the rapping shaft to perform rapping based on the next rotation cycle of the rapping shaft.

[0050] The present invention also provides a computer-readable storage medium storing instructions which, when executed on a computer, cause the computer to perform the above-described low-temperature electrostatic precipitator rapping method.

[0051] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0052] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details described above. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe the various possible combinations.

[0053] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the embodiments of the present invention, they should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A vibration method for a low-temperature electrostatic precipitator, characterized in that, The method includes: During the initial operation phase, a vibration is performed at startup, and the corresponding amount of accumulated dust needs to be collected during this vibration. S10) Collect the ash accumulation parameters at the start-up time of the electrostatic precipitator; among which, The dust accumulation parameters of the electrostatic precipitator include: dust thickness of the dust collector, dust collection area of ​​the final electric field, dust concentration at the inlet of the electrostatic precipitator, dust concentration at the inlet of the final electric field, and dust concentration at the outlet of the final electric field. S20) Determine the current rotation cycle of the rapping shaft based on the ash accumulation parameters at the start-up time of the electrostatic precipitator, and control the rotation of the rapping shaft to perform rapping based on the current rotation cycle of the rapping shaft; wherein, The rule for determining the rotation period of the rapping shaft is as follows: in, The rotation cycle of the rapping shaft; The dust thickness of the dust collector; The dust collection area of ​​the final electric field; The concentration of flue gas at the inlet of the electrostatic precipitator; The inlet dust concentration is the final electric field concentration. The concentration of dust at the outlet of the final electric field; The conversion factors for the adhesion and resistivity of the dust are preset; To preset the coal ash bulk density; S30) Collects real-time ash accumulation parameters of the electrostatic precipitator and determines the next rapping time based on these parameters; whereby, The determination of the next vibration time based on real-time ash accumulation parameters includes: By comparing the dust thickness of the dust collector in the real-time dust accumulation parameters with the preset vibration dust thickness, when the dust thickness of the dust collector is equal to or greater than the preset vibration dust thickness, the corresponding time is determined as the next vibration time. The timing starts from the current completion time of the vibration, and the allowable time range of the next vibration time is determined based on the preset vibration interval length; If the determined next vibration time does not fall within the allowed time range, or if the next vibration time is still not determined even if it exceeds the allowed time range, the next vibration time is corrected based on the allowed time range. S40) At the determined next rapping time, based on the ash accumulation parameters of the electrostatic precipitator at that time, determine the rotation cycle of the rapping shaft for the next rapping, and control the rotation of the rapping shaft to perform rapping based on the rotation cycle of the next rapping shaft. S50) Repeat steps S30)-S40) to perform cyclic vibration of the electrostatic precipitator.

2. The method according to claim 1, characterized in that, Controlling the rotation of the vibrating shaft based on its rotation cycle for vibration includes: The rotation speed of the vibrating shaft is determined based on its rotation period. The rotational speed of the motor driving the rapping shaft is determined based on the rotational speed of the rapping shaft. The motor operation is controlled based on a predetermined motor speed.

3. The method according to claim 1, characterized in that, The preset vibration interval is 60s-300s.

4. The method according to claim 1, characterized in that, The correction of the next vibration time based on the allowed time range includes: If the determined next vibration time does not fall within the allowed time range, then the starting time of the allowed time range is determined as the next vibration time. If the next vibration time is still not determined after the allowed time range has been exceeded, then the end time of the allowed time range is determined as the next vibration time.

5. A rapping system for a low-temperature electrostatic precipitator, characterized in that, The system is used to perform the low-temperature electrostatic precipitator rapping method according to any one of claims 1-4, the system comprising: The data acquisition unit is used to collect the ash accumulation parameters at the start-up time of the electrostatic precipitator and to collect the real-time ash accumulation parameters of the electrostatic precipitator. The processing unit is used to perform the following steps: S1) Determine the rotation cycle of the current rapping shaft based on the ash accumulation parameters at the start-up time of the electrostatic precipitator; S2) Determine the timing of the next rapping based on the real-time ash accumulation parameters of the electrostatic precipitator; S3) At the determined next rapping time, based on the ash accumulation parameters of the electrostatic precipitator at the corresponding time, determine the rotation cycle of the rapping shaft for the next rapping cycle; S4) Repeat steps S2)-S3) to perform cyclic vibration of the electrostatic precipitator; Execution unit, used for: The vibration shaft is controlled to rotate and vibrate based on the current rotation cycle of the vibration shaft. The vibration shaft is controlled to rotate for vibration based on the rotation cycle of the next vibration shaft.

6. A computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the low-temperature electrostatic precipitator rapping method according to any one of claims 1-4.

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