Self-adaptive adjustment method for vibrating period of electric dust remover based on dust removal efficiency

Abstract

The invention discloses a self-adaptive adjustment method for the vibrating period of an electric precipitator based on dust removal efficiency, which relates to the field of electric precipitators and comprises the following steps: collecting smoke dust concentration, smoke gas flow, smoke gas temperature, oxygen content and unit load parameters of an inlet and an outlet of the electric precipitator in real time through measuring points arranged at multiple points; on the basis of the collected parameters, real-time dust removal efficiency is calculated by combining a concentration method with flue gas characteristic correction; setting a reference threshold value and an early warning threshold value, and comparing the real-time dust removal efficiency with the threshold values; according to the comparison result, the vibration period of each electric field is dynamically adjusted in combination with the unit load; a multi-time short-time rapping mode is adopted for the final-stage electric field, the secondary voltage is maintained to be not lower than the preset value during rapping, the period of the electric dust remover can be adjusted in a self-adaptive mode according to the field working condition, and the escape risk of raised fine particles can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of electrostatic precipitator technology, and in particular to an adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency. Background Technology

[0002] Electrostatic precipitators rely on a rapping system to remove ash from the plates / wires to maintain dust removal efficiency. However, existing rapping cycle adjustment methods have significant shortcomings: the layout of measuring points and parameter acquisition are relatively crude, failing to systematically integrate multi-dimensional operating data such as flue gas temperature, oxygen content, and unit load; dust removal efficiency calculations only use a simple concentration method, without incorporating corrections for oxygen deviation and humidity-to-dry-basis flow rate, resulting in large discrepancies between efficiency calculations and actual operating conditions; there is a lack of tiered judgment logic for baseline and warning thresholds, and the rapping cycle adjustment is not deeply coordinated with unit load, making it unable to adapt to differences in ash accumulation characteristics under different loads; for the final stage electric field, which plays a crucial role in fine particle removal, the rapping mode is singular and does not maintain the secondary voltage in coordination, easily causing fine particles to escape due to insufficient electric field adsorption, ultimately making it difficult to accurately adapt the rapping cycle and balance the requirements of high-efficiency dust removal, low-consumption operation, and stable control.

[0003] Therefore, this invention proposes an adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency. Summary of the Invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency, comprising,

[0006] The dust concentration, flue gas flow rate, flue gas temperature, oxygen content and unit load parameters at the inlet and outlet of the electrostatic precipitator are collected in real time through multiple measurement points.

[0007] Based on the collected parameters, the real-time dust removal efficiency is calculated using the concentration method combined with flue gas characteristics correction.

[0008] Set a baseline threshold and an early warning threshold, and compare the real-time dust removal efficiency with the thresholds;

[0009] Based on the comparison results, the rapping cycle of each electric field is dynamically adjusted in conjunction with the unit load.

[0010] Multiple short-time rapping modes are used for the final stage electric field, and the secondary voltage is maintained at or above the preset value during rapping.

[0011] As a preferred embodiment of the adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency described in this invention, the multi-point measurement points cover different positions of the inlet and outlet flues, and the sampling frequency is a preset cycle.

[0012] As a preferred embodiment of the adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency described in this invention, the flue gas characteristic correction includes oxygen correction and humidity correction. The oxygen correction is used to correct the dust concentration when the measured oxygen content deviates from the standard value, and the humidity correction is used to convert the wet basis flow rate into the dry basis flow rate.

[0013] As a preferred embodiment of the adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency described in this invention, the concentration method formula is:

[0014]

[0015] Among them, C 出 C 进 Q represents the concentration of smoke and dust at the inlet and outlet. 出 Q 进 This indicates the flow rate of flue gas at the inlet and outlet.

[0016] As a preferred embodiment of the adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency described in this invention, the logic for threshold judgment is as follows: if the real-time efficiency is not lower than the warning threshold, maintain the current cycle; if the real-time efficiency is between the benchmark threshold and the warning threshold, shorten the cycle; if the real-time efficiency is lower than the benchmark threshold, trigger emergency rapping.

[0017] As a preferred embodiment of the adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency described in this invention, the cycle adjustment is based on the initial cycle of each electric field, combined with the deviation ratio between real-time efficiency and threshold, and a corresponding cycle adjustment coefficient is set according to the unit load.

[0018] As a preferred embodiment of the adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency described in this invention, the cycle adjustment coefficient corresponding to the unit load increases as the load decreases.

[0019] As a preferred embodiment of the adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency described in this invention, the parameters of the multiple short-time rapping mode are: single duration, interval period, and number of rapping cycles per round, and the number of rapping cycles can be increased under high ash coal types.

[0020] As a preferred embodiment of the adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency described in this invention, the method includes: when the efficiency is lower than the warning threshold for the first time, the adjustment is performed after a preset delay; after rapping, the preset duration is locked to prevent repeated adjustments.

[0021] As a preferred embodiment of the adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency described in this invention, the adjustment is triggered when the efficiency fluctuation reaches a preset range and continues for a preset period.

[0022] The beneficial effects of this invention are as follows: This invention accurately collects multi-dimensional parameters of the flue gas at the inlet and outlet of the electrostatic precipitator at multiple points, and combines oxygen and humidity corrections to make the dust removal efficiency calculation more in line with actual working conditions, avoiding efficiency misjudgments caused by single measurement points or uncorrected flue gas characteristics; with dynamic threshold graded response logic, and in coordination with unit load to adjust the rapping cycle, it can adapt to the ash accumulation characteristics under different loads and coal types and ash content scenarios; the final stage electric field adopts multiple short-time rapping modes and maintains the secondary voltage, reducing the risk of fine particles escaping after being lifted; with the help of time lag and deviation lag mechanisms, it avoids frequent adjustments caused by instantaneous fluctuations, which not only stabilizes the system operation, but also extends the life of components such as the electrode plates. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a flowchart of an adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency, as described in Example 1. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0027] Example 1, referring to Figure 1 This is the first embodiment of the present invention, which provides a method for adaptive adjustment of the rapping cycle of an electrostatic precipitator based on dust removal efficiency, including:

[0028] S1: Real-time collection of dust concentration, flue gas flow rate, flue gas temperature, oxygen content and unit load parameters at the inlet and outlet of the electrostatic precipitator through multiple measurement points;

[0029] Multiple measurement points are arranged to cover different locations of the inlet and outlet flues, and the sampling frequency is a preset period.

[0030] Specifically, the measuring points are arranged as follows:

[0031] On the inlet side: 4 measuring holes are set along the vertical height of 6 air intake flues (equal distances from the top, middle and bottom of the electrode plate). 4 sampling points are set along the flue gas flow depth (from the flue wall to the center) of each measuring hole to cover the three-dimensional flow field;

[0032] On the outlet side: 4 measuring holes are set along the circumference (0°, 90°, 180°, 270°) of the 6 exhaust flues. 4 sampling points are set along the depth of each measuring hole to cover the circumferential and radial concentration distribution;

[0033] S2: Based on the collected parameters, the real-time dust removal efficiency is calculated using the concentration method combined with flue gas characteristics correction.

[0034] Specifically, parameter acquisition includes real-time acquisition of inlet and outlet dust concentration (standard state, dry basis, 6% O2 reference), flue gas flow rate (standard state, wet basis), flue gas temperature (accuracy ±1℃), oxygen content (zirconia sensor, response ≤5s), and unit load (DCS reading, accuracy ±1% of rated load), with an acquisition frequency of 10 seconds / time, providing multi-dimensional operating condition data for subsequent calculations;

[0035] By using a grid method to cover complex flow fields, the representativeness of the data is improved by 30% compared to single-point sampling, avoiding misjudgment of operating conditions due to insufficient measurement points;

[0036] Flue gas characteristic correction includes oxygen correction and humidity correction. Oxygen correction is used to correct the dust concentration when the measured oxygen content deviates from the standard value. Humidity correction is used to convert the wet basis flow rate to the dry basis flow rate.

[0037] The concentration method formula is:

[0038]

[0039] Among them, C 出 C 进 Q represents the concentration of smoke and dust at the inlet and outlet. 出 Q 进 Indicates the inlet and outlet flue gas flow rates;

[0040] Oxygen content correction can be performed as follows: for example, when the measured oxygen content deviates from 6% (e.g., 3.32% at the inlet and 3.57% at the outlet), the concentration is corrected using the excess air coefficient formula:

[0041]

[0042] When performing humidity correction, the wet basis flow rate is converted to a dry basis flow rate based on the moisture content of the flue gas before being included in the calculation. The calculation formula is as follows:

[0043] Q 干基=Q 湿基 ×(1-X 湿 );

[0044] Among them, X 湿 Indicates the moisture content of the flue gas;

[0045] Existing technologies suffer from significant efficiency errors due to the lack of correction for oxygen and humidity. This invention, by correcting for humidity and oxygen levels, can provide a precise basis for periodic adjustments.

[0046] S3: Set the baseline threshold and warning threshold, and compare the real-time dust removal efficiency with the threshold;

[0047] The threshold judgment logic is as follows: if the real-time efficiency is not lower than the warning threshold, maintain the current cycle; if the real-time efficiency is between the benchmark threshold and the warning threshold, shorten the cycle; if the real-time efficiency is lower than the benchmark threshold, trigger emergency vibration.

[0048] S4: Based on the comparison results, adjust the rapping cycle of each electric field dynamically according to the unit load;

[0049] The periodic adjustment is based on the initial period of each electric field, combined with the deviation ratio between real-time efficiency and threshold, and the corresponding periodic adjustment coefficient is set according to the unit load. The periodic adjustment coefficient corresponding to the unit load increases as the load decreases.

[0050] S5: Multiple short-time rapping modes are used for the final electric field, and the secondary voltage is maintained at a preset value during rapping.

[0051] The parameters for the multiple short-time rapping mode are: single duration, interval period, and number of rapping cycles per round. The number of rapping cycles can be increased for high-ash coal types.

[0052] Specifically, when the efficiency falls below the warning threshold for the first time, the adjustment is performed after a preset delay; after vibration, the preset duration is locked, and repeated adjustments are prohibited.

[0053] Preferably, adjustments are triggered when efficiency fluctuations reach a preset range and persist for a preset period.

[0054] This embodiment uses multi-point precise acquisition of multi-dimensional parameters of the flue gas at the inlet and outlet of the electrostatic precipitator, combined with oxygen and humidity corrections, to make the dust removal efficiency calculation more consistent with actual operating conditions, avoiding efficiency misjudgments caused by single measurement points or uncorrected flue gas characteristics. A dynamic threshold-based graded response logic, combined with unit load-coordinated adjustment of the rapping cycle, can adapt to ash accumulation characteristics under different loads and coal types with varying ash content. The final stage electric field employs multiple short-time rapping modes while maintaining secondary voltage, reducing the risk of fine particles escaping after being lifted. Time lag and deviation lag mechanisms are used to avoid frequent adjustments caused by instantaneous fluctuations, stabilizing system operation and extending the lifespan of components such as the electrode plates. Ultimately, this achieves reduced dust removal efficiency fluctuations, fewer ineffective rappings, and lower energy consumption, meeting ultra-low emission requirements, and making the electrostatic precipitator's rapping cycle more intelligent, durable, and adaptable to complex industrial conditions.

[0055] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) 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 USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0056] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0057] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0058] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented in combination with any of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0059] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for adaptive adjustment of the rapping cycle of an electrostatic precipitator based on dust removal efficiency, characterized in that: include, The dust concentration, flue gas flow rate, flue gas temperature, oxygen content and unit load parameters at the inlet and outlet of the electrostatic precipitator are collected in real time through multiple measurement points. Based on the collected parameters, the real-time dust removal efficiency is calculated using the concentration method combined with flue gas characteristics correction. Set a baseline threshold and an early warning threshold, and compare the real-time dust removal efficiency with the thresholds; Based on the comparison results, the rapping cycle of each electric field is dynamically adjusted in conjunction with the unit load. Multiple short-time rapping modes are used for the final stage electric field, and the secondary voltage is maintained at or above the preset value during rapping.

2. The adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency as described in claim 1, characterized in that: The multi-point measurement points cover different locations in the inlet and outlet flues, and the sampling frequency is a preset period.

3. The adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency as described in claim 2, characterized in that: The flue gas characteristic correction includes oxygen correction and humidity correction. The oxygen correction is used to correct the dust concentration when the measured oxygen content deviates from the standard value. The humidity correction is used to convert the wet basis flow rate to the dry basis flow rate.

4. The adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency as described in claim 3, characterized in that: The concentration method formula is as follows: Among them, C 出 C 进 Q represents the concentration of smoke and dust at the inlet and outlet. 出 Q 进 This indicates the flow rate of flue gas at the inlet and outlet.

5. The adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency as described in claim 4, characterized in that: The threshold judgment logic is as follows: if the real-time efficiency is not lower than the warning threshold, maintain the current cycle; if the real-time efficiency is between the benchmark threshold and the warning threshold, shorten the cycle; if the real-time efficiency is lower than the benchmark threshold, trigger emergency vibration.

6. The adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency as described in claim 5, characterized in that: The period adjustment is based on the initial period of each electric field, combined with the deviation ratio between real-time efficiency and threshold, and the corresponding period adjustment coefficient is set according to the unit load.

7. The adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency as described in claim 6, characterized in that: The periodic adjustment coefficient corresponding to the unit load increases as the load decreases.

8. The adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency as described in claim 7, characterized in that: The parameters of the multiple short-time rapping mode are: single duration, interval period, and number of rapping cycles per round, and the number of rapping cycles can be increased for high ash coal types.

9. The adaptive adjustment method for the rapping cycle of an electrostatic precipitator based on dust removal efficiency as described in claim 8, characterized in that: When the efficiency falls below the warning threshold for the first time, the adjustment is performed after a preset delay; after the vibration, the preset duration is locked, and repeated adjustments are prohibited.

10. The method for adaptive adjustment of the rapping cycle of an electrostatic precipitator based on dust removal efficiency as described in claim 9, characterized in that: Adjustments are triggered when efficiency fluctuations reach a preset range and persist for a preset period.

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