Automatic frequency conversion sound wave soot blowing control system and control method

Abstract

The invention discloses an automatic frequency conversion sound wave soot blowing control system and control method, and belongs to the technical field of soot blower control programs.The automatic frequency conversion sound wave soot blowing control method comprises the following steps that S1, relevant information is preset; s2, setting the starting sequence of soot blowers in each cycle, the soot blowing duration t0 of a single soot blower, the starting time t1 and the interval time t2; s3, limiting the upper limit, the lower limit and the period of the output frequency of the frequency converter; s4, the soot blowers are started in sequence, S5, the step S3 is repeated until all the soot blowers work, and the method has the effect that the sound wave frequency of the sound wave soot blowers can be more accurately controlled by controlling the frequency converter.

Description

Technical Field

[0001] The invention relates to the field of sootblower control programs, and in particular to an automatic frequency-converting sonic sootblowing control system and a control method. Background Art

[0002] The sonic sootblower technology converts compressed air (or steam) into high-power sonic or infrasonic waves and sends them into the furnace. When the ash on the heating surface is repeatedly pulled and compressed by the density waves that change alternately at a certain frequency, it loosens and falls off due to fatigue and is carried away with the flue gas flow, or sinks to the ash hopper under the action of gravity and is discharged. Usually, large boilers are equipped with multiple sonic sootblower, which generally work individually or in groups in turn, and the working process is controlled by the sootblower control system.

[0003] The above-mentioned prior art solutions have the following defects: currently, the alternating changes of the sonic frequencies of multiple sonic soot blowers during operation need to be changed according to demand, and the sonic soot blowing control system needs to control the sonic frequencies of the sonic soot blowers more accurately. Summary of the invention

[0004] In order to quickly and accurately control the sonic frequency of a sonic sootblower according to demand, the present application provides an automatic frequency-variable sonic sootblowing control system and a control method.

[0005] The present application provides an automatic variable frequency sonic soot blowing control method using the following technical solutions: On the one hand, a method for controlling soot blowing with automatic frequency conversion includes the following steps: S1, preset the soot blower number, preset the frequency converter to be connected to the soot blower, and control the soot blower's sound wave frequency; S2, setting the sootblower start sequence, the sootblowing time t0, the start time t1 and the interval time t2 of a single sootblower in each cycle; S3, limit the upper limit, lower limit and period of the inverter output frequency; S4, start the soot blowers in sequence, while the frequency converter does not work. After time t1, start the frequency converter, and the frequency converter controls the output frequency to output in the form of a sine wave. When the frequency converter outputs the frequency, the sine wave is fitted as a broken line. After time t0, the frequency converter is controlled to stop output. After time t1, the current soot blower is controlled to stop working. S5. After time t2, repeat step S3 until all sootblowers have completed their work.

[0006] By adopting the above solution, when setting the sootblowing program, the user only needs to set the desired working time, the upper limit, lower limit and cycle of the inverter's output frequency, and the system can automatically control the sootblower operation. When the demand changes, just change the frequency set by the inverter. The modification is convenient and the sound wave frequency control is stable.

[0007] Preferably, the method further comprises the following steps: S1, preset standard sound wave frequency curve; S6. Detect the voltage and sound wave frequency of the soot blower, and record the voltage change and sound wave frequency change of each soot blower in each working process; The voltage change and the sound wave frequency change of each soot blower in each working process are plotted into a voltage curve and a sound wave frequency curve; Whenever a new sound wave frequency curve is recorded, the maximum difference between the new sound wave frequency curve and the standard sound wave frequency curve is detected. If the maximum difference exceeds the preset difference, the soot blower is judged to be faulty. If the maximum difference does not exceed the preset difference, the standard sound wave frequency curve is corrected according to the newly recorded sound wave frequency curve to make the standard sound wave frequency close to the recorded sound wave frequency curve. When a soot blower failure is detected, all soot blowers are stopped and a fault report is sent.

[0008] By adopting the above scheme, the working status of the sootblower can be understood through the voltage curve and the sound wave frequency curve of the sootblower. By comparing the sound wave frequency curve, it can be determined whether the sootblower has a significant change in the sound wave frequency, thereby determining whether the sootblower is faulty.

[0009] Preferably, the method further comprises the following steps: S7, calculating the relationship between the voltage and the sound wave frequency of the same soot blower at the same time according to the voltage curve and the sound wave frequency curve; S8. When receiving the sound wave frequency requirement input from the outside, the sound wave frequency requirement is introduced into the voltage and sound wave frequency relationship formula or the voltage setting value; Modify the upper limit, lower limit and period of the output frequency of the inverter associated with the sootblower according to the voltage setting value.

[0010] By adopting the above solution, it is still troublesome for the user to control the soot blower's sound frequency by directly modifying the frequency converter parameters. However, the relationship between the frequency converter parameters and the soot blower's sound frequency of a fixed soot blower device in a fixed environment is certain. Therefore, the system can determine the relationship through the collected voltage data and sound frequency data. The user can automatically set the frequency converter parameters by directly inputting the sound frequency requirements.

[0011] Preferably, the method further comprises the following steps: S1, preset normal ultrasound three-dimensional image; S9. After a single cycle is completed, use ultrasonic waves to scan the environment inside the furnace, and generate an ultrasonic three-dimensional map based on the scanning results; Compare the newly acquired three-dimensional ultrasonic image with the normal three-dimensional ultrasonic image to determine whether there are bulges or gaps on the newly acquired three-dimensional ultrasonic image; If it is determined that a bulge appears on the ultrasonic three-dimensional graph, then the sonic soot blower around the bulge is selected according to the position of the bulge, the output power of the selected sonic soot blower is increased and the selected sonic soot blower is started, and the test is performed again after the soot blowing is completed; If it is determined that a gap appears on the ultrasonic three-dimensional map, the gap position is marked and then the marked ultrasonic three-dimensional map is output, and a sonic soot blower around the gap is selected to reduce the output power of the selected sonic soot blower.

[0012] By adopting the above scheme, after the sootblower blows soot in the furnace, there may be places that are not cleaned due to various problems. Dust and other debris will accumulate to form dust accumulation. The longer the dust is not cleaned, the more difficult it will be to clean it. The situation in the furnace can be observed through the ultrasonic three-dimensional image. The bulge is generally dust accumulation or other debris accumulation. The system automatically judges the sootblowing result after the sootblowing is completed. If there is dust accumulation, the power of the sootblower that can blow out the dust will be increased and sootblowing will be performed again. If a gap appears, an alarm will be sounded first to notify the staff, and at the same time, the power of the sootblower that can blow to the gap will be reduced to avoid damage to the wall at the gap.

[0013] Preferably, the step of "reducing the output power of the selected sonic sootblower" further comprises: After a gap appears on the ultrasonic three-dimensional image, the wall material and ambient temperature of the gap are obtained, and the resonant frequency of the gap is calculated based on the gap shape; The output power of the selected sonic sootblower is adjusted until the sonic frequency of the sonic sootblower is lower than the calculated resonant frequency.

[0014] By adopting the above solution, the system calculates the output power of the sonic soot blower that needs to be reduced through the resonant frequency of the gap, and maintains the sound wave intensity as much as possible without causing damage to the wall at the gap.

[0015] Preferably, the step S9 further includes: After receiving the instruction to clean the gap, all the sonic soot blowers are stopped, the sonic soot blowers around the gap are selected, the power and air pressure of the selected sonic soot blowers are increased, and the selected sonic soot blowers are started.

[0016] By adopting the above solution, before repairing the gap, the user can issue a gap cleaning instruction and manually let the sonic soot blower to blow the gap strongly to clean out impurities in the gap, making it easier for subsequent staff to repair the gap.

[0017] Preferably, the step S1 further comprises: S1. Preset impact range; The step of "selecting a sonic soot blower around the protrusion" comprises: Determine the center point of the bulge on the ultrasonic three-dimensional graph, and select a sonic soot blower within the influence range with the center point as the center; The step of "selecting a sonic soot blower around the gap" comprises: Determine the center point of the gap on the ultrasonic three-dimensional diagram and select a sonic soot blower within the influence range with the center point as the center.

[0018] By adopting the above solution, since the working ranges of the sootblowers overlap each other, the ultrasonic sootblowers corresponding to the area on the ultrasonic three-dimensional map are determined by the midpoint of the sootblowers.

[0019] Preferably, the method further comprises the following steps: S9, dividing the ultrasonic three-dimensional map into regions according to the soot blowing range of each soot blower, and marking the number of the corresponding soot blower at the center point of each region; S10, preset the standard value of sound wave intensity and voltage; Detect the sound wave intensity at the soot blowing port of each soot blower at every moment when it is started and record it; Determine whether dust accumulation occurs in the ultrasonic three-dimensional image; If dust accumulation occurs, the nearest center point of the area is determined by the dust accumulation position, the number of the sonic soot blower at the center point of the area is read, and the sonic wave intensity and voltage value of the sonic soot blower corresponding to the number are read; If the sound wave intensity is lower than the sound wave intensity standard value, and the voltage value is lower than the voltage standard value, a power supply fault signal is output; If the sound wave intensity is lower than the sound wave intensity standard value and the voltage value is higher than the voltage standard value, a blocking fault signal is output.

[0020] By adopting the above scheme, the cause of the soot blower failure can be determined through the ultrasonic three-dimensional diagram and the recorded historical data, which makes it convenient for the staff to inspect and repair the sonic soot blower.

[0021] On the other hand, the present application provides an automatic variable frequency sonic soot blowing control system adopts the following technical solution: An automatic frequency-converting sonic soot blowing control system comprises a data storage module, a cycle setting module, a frequency-converting setting module and a soot blowing control module; The data storage module stores a preset sootblower number; The cycle setting module receives the input instruction, calls the sootblower number stored in the data storage module, and sets the sootblower start sequence, the sootblowing time t0 of a single sootblower, the start time t1 and the interval time t2 according to the instruction, and sends the setting information to the sootblowing control module; The frequency conversion setting module receives the input command and sets the upper limit, lower limit and period of the inverter output frequency according to the command; After receiving the start-up instruction, the sootblowing control module controls the start-up of the sootblower according to the set information, and starts the frequency converter, controls the output frequency of the frequency converter to be a sine wave, and fits the sine wave into a broken line. The sootblowing control module controls the working cycle of each frequency converter to start the sootblower, wait time t1, start the frequency converter, wait time t0, turn off the frequency converter, wait time t1, turn off the sootblower, wait time t2, and switch to control the next sootblower in sequence.

[0022] By adopting the above solution, when setting the sootblowing program, the user only needs to set the desired working time, the upper limit, lower limit and cycle of the inverter's output frequency, and the system can automatically control the sootblower operation. When the demand changes, just change the frequency set by the inverter. The modification is convenient and the sound wave frequency control is stable.

[0023] Preferably, it also includes an acoustic wave detection module, a three-dimensional judgment module, an emergency cleaning module and a gap processing module; The soot blowing control module sends a detection signal to the acoustic wave detection module after completing the cycle according to the setting information; The acoustic wave detection module includes an ultrasonic scanner preset in the furnace. After receiving the detection signal, the acoustic wave detection module starts the ultrasonic scanner, receives the scanning result of the ultrasonic scanner and generates an ultrasonic three-dimensional map, and sends the ultrasonic three-dimensional map to the three-dimensional judgment module; The data storage module is preset with a normal ultrasonic three-dimensional image; The three-dimensional judgment module calls the normal ultrasonic three-dimensional image stored in the data storage module. After receiving the ultrasonic three-dimensional image, the three-dimensional judgment module compares the ultrasonic three-dimensional image with the normal ultrasonic three-dimensional image to judge whether there is a bulge or a gap on the ultrasonic three-dimensional image. If it is judged that a bulge appears on the ultrasonic three-dimensional image, a bulge alarm signal is output; if it is judged that a gap appears on the ultrasonic three-dimensional image, a gap alarm signal is output; The emergency cleaning module receives the bulge alarm signal output by the three-dimensional judgment module, determines the center point of the bulge on the ultrasonic three-dimensional map according to the bulge alarm signal, selects a sonic soot blower within the influence range with the center point as the center, increases the output power of the selected sonic soot blower and starts the selected sonic soot blower, and controls the sonic detection module to start the ultrasonic scanner; The gap processing module receives the gap alarm signal output by the three-dimensional judgment module, and determines the center point of the gap on the ultrasonic three-dimensional map according to the gap alarm signal, selects a sonic soot blower within the influence range with the center point as the center, obtains the wall material and ambient temperature where the gap is located, calculates the resonant frequency of the gap in combination with the gap shape, and adjusts the output power of the selected sonic soot blower until the sound wave frequency of the sonic soot blower is lower than the calculated resonant frequency.

[0024] By adopting the above scheme, the system understands the furnace through ultrasonic three-dimensional images. The bulges are generally dust accumulation or other debris accumulation. The system automatically judges the sootblowing result after the sootblowing is completed. If there is dust accumulation, the power of the sootblower that can blow out the dust will be increased and sootblowing will be performed again. If a gap appears, an alarm will be sounded first to notify the staff, and at the same time the power of the sootblower that can blow to the gap will be reduced to avoid damage to the wall at the gap.

[0025] In summary, the present invention has the following beneficial effects: 1. The system can automatically control the operation of the soot blower. When the demand changes, just change the frequency set by the inverter. It is easy to modify and the sound wave frequency control is stable.

[0026] 2. The system uses ultrasonic three-dimensional images to understand the furnace. Bumps are generally caused by dust accumulation or other debris accumulation. The system automatically determines the sootblowing result after the sootblowing is completed. If there is dust accumulation, the power of the sootblower that can blow out the dust will be increased and sootblowing will be performed again. If a gap appears, an alarm will be sounded first to notify the staff, and at the same time the power of the sootblower that can blow to the gap will be reduced to avoid damage to the wall at the gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall system block diagram of the second embodiment of the present application.

[0028] Description of reference numerals: 1. Data storage module; 2. Cycle setting module; 3. Frequency setting module; 4. Soot blowing control module; 5. Sound wave detection module; 51. Ultrasonic scanner; 6. Three-dimensional judgment module; 7. Emergency cleaning module; 8. Gap processing module. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1 This application is described in further detail.

[0030] The present application embodiment discloses an automatic frequency conversion sonic soot blowing control method, and the specific steps are as follows: S1. Preset information: Preset sootblower number. Preset inverter connected to sootblower and controls sootblower sound frequency. Preset standard sound wave frequency curve. Preset normal ultrasonic three-dimensional graph. Preset impact range. Preset sound wave intensity standard value and voltage standard value.

[0031] S2. Sootblower settings: Set the sootblower start sequence, single sootblower sootblowing duration t0, start time t1 and interval time t2 in each cycle.

[0032] S3, inverter settings: Limits the upper and lower limits and period of the inverter output frequency.

[0033] S4, start soot blowing: Start the soot blowers in sequence while the frequency converter does not work. After time t1, start the frequency converter and control the output frequency of the frequency converter to output in the form of a sine wave. When the frequency converter outputs the frequency, fit the sine wave into a broken line. After time t0, control the frequency converter to stop output. After time t1, control the current soot blower to stop working.

[0034] S5, soot blowing completed: After time t2, step S3 is repeated until all sootblowers have completed their work.

[0035] S6. Fault detection: Detect the voltage and sound wave frequency of the soot blower, and record the voltage change and sound wave frequency change of each soot blower in each working process.

[0036] The voltage change and the acoustic wave frequency change of each sootblower in each working process are plotted as a voltage curve and an acoustic wave frequency curve.

[0037] Whenever a new sound wave frequency curve is recorded, the maximum difference between the new sound wave frequency curve and the standard sound wave frequency curve is detected. If the maximum difference exceeds the preset difference, the soot blower is judged to be faulty. If the maximum difference does not exceed the preset difference, the standard sound wave frequency curve is corrected according to the newly recorded sound wave frequency curve to make the standard sound wave frequency close to the recorded sound wave frequency curve.

[0038] When a soot blower is judged to be faulty, all soot blowers are stopped and a fault report is sent. The working status of the soot blower can be understood through the voltage curve and the sound wave frequency curve of the soot blower. By comparing the sound wave frequency curve, it can be determined whether the soot blower has a significant change in the sound wave frequency, thereby determining whether the soot blower is faulty.

[0039] S7. Generate formula: The relationship between the voltage and the acoustic frequency of the same soot blower at the same time is calculated based on the voltage curve and the acoustic frequency curve.

[0040] S8, automatic adjustment parameters: When receiving the sound wave frequency requirement input from the outside, the sound wave frequency requirement is introduced into the voltage and sound wave frequency relationship formula or the voltage setting value.

[0041] Modify the upper limit, lower limit and period of the output frequency of the inverter associated with the sootblower according to the voltage setting value. Since it is troublesome for users to control the sootblower's sonic frequency by directly modifying the inverter parameters, the relationship between the inverter parameters and the sootblower's sonic frequency is certain for a fixed sootblower device in a fixed environment, so the system can determine the relationship through the collected voltage data and sonic frequency data, and the user can automatically set the inverter parameters by directly inputting the sonic frequency requirements.

[0042] S9, Ultrasonic Scan: After a single cycle is completed, ultrasonic waves are used to scan the furnace environment and an ultrasonic three-dimensional map is generated based on the scanning results.

[0043] The just-acquired ultrasonic three-dimensional image is compared with the normal ultrasonic three-dimensional image to determine whether a bulge or a gap appears on the just-acquired ultrasonic three-dimensional image.

[0044] If it is determined that a bulge appears on the ultrasonic three-dimensional graph, the center point of the bulge on the ultrasonic three-dimensional graph is determined, and a sonic soot blower within the influence range with the center point as the center is selected, the output power of the selected sonic soot blower is increased and the selected sonic soot blower is started, and re-detection is performed after the soot blowing is completed.

[0045] If it is determined that a gap appears on the ultrasonic three-dimensional graph, the center point of the gap on the ultrasonic three-dimensional graph is determined, and a sonic soot blower within the influence range with the center point as the center is selected, and the sonic soot blowers around the gap are selected. After a gap appears on the ultrasonic three-dimensional graph, the wall material and ambient temperature where the gap is located are obtained, and the resonant frequency of the gap is calculated in combination with the shape of the gap.

[0046] Adjust the output power of the selected sonic sootblower until the sonic frequency of the sonic sootblower is lower than the calculated resonant frequency. The system calculates the output power of the sonic sootblower that needs to be reduced by the resonant frequency of the gap, and maintains the sonic intensity as much as possible without causing damage to the wall at the gap.

[0047] The situation inside the furnace can be observed through the ultrasonic three-dimensional image. The bulges are generally dust accumulation or other debris accumulation. The system automatically determines the sootblowing result after the sootblowing is completed. If there is dust accumulation, the power of the sootblower that can blow out the dust will be increased and sootblowing will be performed again. If a gap appears, an alarm will be sounded first to notify the staff, and at the same time the power of the sootblower that can blow to the gap will be reduced to avoid damage to the wall at the gap.

[0048] After receiving the gap cleaning instruction, all sonic soot blowers are stopped, sonic soot blowers around the gap are selected, the power and air pressure of the selected sonic soot blowers are increased, and the selected sonic soot blowers are started. Before repairing the gap, the user can issue a gap cleaning instruction and manually let the sonic soot blower to blow the gap strongly to clean up the impurities in the gap, so as to facilitate the subsequent repair of the gap by the staff.

[0049] The ultrasonic three-dimensional map is divided into regions according to the soot blowing range of each soot blower, and the number of the corresponding soot blower is marked at the center point of each region.

[0050] S10, fault cause identification: Detect the sound wave intensity at the soot blowing port of each soot blower at each time when it is started and record it. Determine whether dust accumulation appears in the ultrasonic three-dimensional map.

[0051] If dust accumulation occurs, the nearest center point of the area is determined by the dust accumulation position, the number of the sonic soot blower at the center point of the area is read, and the sonic wave intensity and voltage value of the sonic soot blower corresponding to the number are read.

[0052] If the sound wave intensity is lower than the sound wave intensity standard value and the voltage value is lower than the voltage standard value, a power failure signal is output.

[0053] If the sound wave intensity is lower than the standard value of the sound wave intensity and the voltage value is higher than the standard value of the voltage, a blockage fault signal is output. The cause of the soot blower failure can be determined through the ultrasonic three-dimensional diagram and the recorded historical data, which is convenient for the staff to inspect and repair the sonic soot blower.

[0054] The implementation principle of an automatic frequency-variable sonic sootblowing control method in an embodiment of the present application is as follows: when setting the sootblowing program, the user only needs to set the desired working time, the upper limit, lower limit and cycle of the output frequency of the inverter, and the system can automatically control the operation of the sootblower. When the demand changes, the frequency set by the inverter can be changed. The modification is convenient and the sonic frequency control is stable.

[0055] The present application embodiment discloses an automatic variable frequency sonic soot blowing control system, such as Figure 1 As shown, it includes a data storage module 1, a cycle setting module 2, a frequency setting module 3, a soot blowing control module 4, an acoustic wave detection module 5, a three-dimensional judgment module 6, an emergency cleaning module 7 and a gap processing module 8.

[0056] like Figure 1As shown, the data storage module 1 stores the preset sootblower number and the normal ultrasonic three-dimensional map. The cycle setting module 2 receives the input command, calls the sootblower number stored in the data storage module 1, and sets the sootblower start sequence, the sootblowing time t0 of a single sootblower, the start time t1 and the interval time t2 according to the command, and sends the setting information to the sootblowing control module 4. The frequency conversion setting module 3 receives the input command, and sets the upper limit, lower limit and cycle of the inverter output frequency according to the command.

[0057] like Figure 1 As shown, after receiving the start-up instruction, the sootblowing control module 4 controls the sootblower to start according to the setting information, and starts the frequency converter, controls the output frequency of the frequency converter to be a sine wave, and fits the sine wave to a broken line. The sootblowing control module 4 controls the working cycle of each frequency converter to start the sootblower, wait for time t1, start the frequency converter, wait for time t0, turn off the frequency converter, wait for time t1, turn off the sootblower, wait for time t2, and switch to control the next sootblower in sequence. After completing the cycle according to the setting information, the sootblowing control module 4 sends a detection signal to the acoustic wave detection module 5.

[0058] like Figure 1 As shown, the acoustic wave detection module 5 includes an ultrasonic scanner 51 preset in the furnace. After receiving the detection signal, the acoustic wave detection module 5 starts the ultrasonic scanner 51, receives the scanning result of the ultrasonic scanner 51 and generates an ultrasonic three-dimensional image, and sends the ultrasonic three-dimensional image to the three-dimensional judgment module 6.

[0059] like Figure 1 As shown, the three-dimensional judgment module 6 calls the normal ultrasonic three-dimensional image stored in the data storage module 1. After receiving the ultrasonic three-dimensional image, the three-dimensional judgment module 6 compares the ultrasonic three-dimensional image with the normal ultrasonic three-dimensional image to determine whether there are protrusions or gaps on the ultrasonic three-dimensional image. If it is determined that a protrusion appears on the ultrasonic three-dimensional image, a protrusion alarm signal is output; if it is determined that a gap appears on the ultrasonic three-dimensional image, a gap alarm signal is output.

[0060] like Figure 1 As shown, the emergency cleaning module 7 receives the bulge alarm signal output by the three-dimensional judgment module 6, and determines the center point of the bulge on the ultrasonic three-dimensional graph according to the bulge alarm signal, selects the sonic soot blower within the influence range with the center point as the center, increases the output power of the selected sonic soot blower and starts the selected sonic soot blower, and controls the sonic detection module 5 to start the ultrasonic scanner 51.

[0061] like Figure 1As shown, the gap processing module 8 receives the gap alarm signal output by the three-dimensional judgment module 6, and determines the center point of the gap on the ultrasonic three-dimensional map according to the gap alarm signal, selects the sonic soot blower within the influence range with the center point as the center, obtains the wall material and ambient temperature where the gap is located, calculates the resonant frequency of the gap in combination with the gap shape, and adjusts the output power of the selected sonic soot blower until the sound wave frequency of the sonic soot blower is lower than the calculated resonant frequency.

[0062] The system uses ultrasonic three-dimensional images to understand the furnace. Bumps are generally caused by dust accumulation or other debris accumulation. The system automatically determines the sootblowing result after the sootblowing is completed. If there is dust accumulation, the power of the sootblower that can blow out the dust will be increased and sootblowing will be performed again. If a gap appears, an alarm will be sounded first to notify the staff, and at the same time the power of the sootblower that can blow to the gap will be reduced to avoid damage to the wall at the gap.

[0063] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic frequency conversion sonic soot blowing control method, characterized in that: The following steps are involved: S1, preset the soot blower number, preset the frequency converter to be connected to the soot blower, and control the soot blower's sound wave frequency; S2, setting the sootblower start sequence, the sootblowing time t0, the start time t1 and the interval time t2 of a single sootblower in each cycle; S3, limit the upper limit, lower limit and period of the inverter output frequency; S4, start the soot blowers in sequence, while the frequency converter does not work. After time t1, start the frequency converter, and the frequency converter controls the output frequency to output in the form of a sine wave. When the frequency converter outputs the frequency, the sine wave is fitted as a broken line. After time t0, the frequency converter is controlled to stop output. After time t1, the current soot blower is controlled to stop working. S5. After time t2, repeat step S3 until all sootblowers have completed their work.

2. The automatic frequency conversion sonic soot blowing control method according to claim 1 is characterized in that: The following steps are also included: S1, preset standard sound wave frequency curve; S6. Detect the voltage and sound wave frequency of the soot blower, and record the voltage change and sound wave frequency change of each soot blower in each working process; The voltage change and the sound wave frequency change of each soot blower in each working process are plotted into a voltage curve and a sound wave frequency curve; Whenever a new sound wave frequency curve is recorded, the maximum difference between the new sound wave frequency curve and the standard sound wave frequency curve is detected. If the maximum difference exceeds the preset difference, the soot blower is judged to be faulty. If the maximum difference does not exceed the preset difference, the standard sound wave frequency curve is corrected according to the newly recorded sound wave frequency curve to make the standard sound wave frequency close to the recorded sound wave frequency curve. When a soot blower failure is detected, all soot blowers are stopped and a fault report is sent.

3. The automatic frequency conversion sonic soot blowing control method according to claim 2 is characterized in that: The following steps are also included: S7, calculating the relationship between the voltage and the sound wave frequency of the same soot blower at the same time according to the voltage curve and the sound wave frequency curve; S8. When receiving the sound wave frequency requirement input from the outside, the sound wave frequency requirement is introduced into the voltage and sound wave frequency relationship formula or the voltage setting value; Modify the upper limit, lower limit and period of the output frequency of the inverter associated with the sootblower according to the voltage setting value.

4. The automatic frequency conversion sonic soot blowing control method according to claim 1 is characterized in that: The following steps are also included: S1, preset normal ultrasound three-dimensional image; S9. After a single cycle is completed, use ultrasonic waves to scan the environment inside the furnace, and generate an ultrasonic three-dimensional map based on the scanning results; Compare the newly acquired three-dimensional ultrasonic image with the normal three-dimensional ultrasonic image to determine whether there are bulges or gaps on the newly acquired three-dimensional ultrasonic image; If it is determined that a bulge appears on the ultrasonic three-dimensional graph, then the sonic soot blower around the bulge is selected according to the position of the bulge, the output power of the selected sonic soot blower is increased and the selected sonic soot blower is started, and the test is performed again after the soot blowing is completed; If it is determined that a gap appears on the ultrasonic three-dimensional map, the gap position is marked and then the marked ultrasonic three-dimensional map is output, and a sonic soot blower around the gap is selected to reduce the output power of the selected sonic soot blower.

5. The automatic frequency conversion sonic soot blowing control method according to claim 4 is characterized in that: The step of "reducing the output power of the selected sonic sootblower" also includes: After a gap appears on the ultrasonic three-dimensional image, the wall material and ambient temperature of the gap are obtained, and the resonant frequency of the gap is calculated based on the gap shape; The output power of the selected sonic sootblower is adjusted until the sonic frequency of the sonic sootblower is lower than the calculated resonant frequency.

6. The automatic frequency conversion sonic soot blowing control method according to claim 4 is characterized in that: The step S9 further comprises: After receiving the instruction to clean the gap, all the sonic soot blowers are stopped, the sonic soot blowers around the gap are selected, the power and air pressure of the selected sonic soot blowers are increased, and the selected sonic soot blowers are started.

7. The automatic frequency conversion sonic soot blowing control method according to claim 4 is characterized in that: The step S1 further comprises: S1. Preset impact range; The step of "selecting a sonic soot blower around the protrusion" comprises: Determine the center point of the bulge on the ultrasonic three-dimensional graph, and select a sonic soot blower within the influence range with the center point as the center; The step of "selecting a sonic soot blower around the gap" comprises: Determine the center point of the gap on the ultrasonic three-dimensional diagram and select a sonic soot blower within the influence range with the center point as the center.

8. The automatic frequency conversion sonic soot blowing control method according to claim 4 is characterized in that: The following steps are also included: S9, dividing the ultrasonic three-dimensional map into regions according to the soot blowing range of each soot blower, and marking the number of the corresponding soot blower at the center point of each region; S10, preset the standard value of sound wave intensity and voltage; Detect the sound wave intensity at the soot blowing port of each soot blower at every moment when it is started and record it; Determine whether dust accumulation occurs in the ultrasonic three-dimensional image; If dust accumulation occurs, the nearest center point of the area is determined by the dust accumulation position, the number of the sonic soot blower at the center point of the area is read, and the sonic wave intensity and voltage value of the sonic soot blower corresponding to the number are read; If the sound wave intensity is lower than the sound wave intensity standard value, and the voltage value is lower than the voltage standard value, a power supply fault signal is output; If the sound wave intensity is lower than the sound wave intensity standard value and the voltage value is higher than the voltage standard value, a blocking fault signal is output.

9. An automatic frequency conversion sonic soot blowing control system, characterized in that: It comprises a data storage module (1), a circulation setting module (2), a frequency conversion setting module (3) and a soot blowing control module (4); The data storage module (1) stores a preset sootblower number; The cycle setting module (2) receives the input command, calls the sootblower number stored in the data storage module (1), sets the sootblower start sequence, the sootblowing time t0 of a single sootblower, the start time t1 and the interval time t2 according to the command, and sends the setting information to the sootblowing control module (4); The frequency conversion setting module (3) receives an input instruction and sets the upper limit, lower limit and period of the inverter output frequency according to the instruction; After receiving the start-up instruction, the sootblowing control module (4) controls the sootblower to start according to the setting information, and starts the frequency converter, controls the output frequency of the frequency converter to be a sine wave, and fits the sine wave to a broken line. The sootblowing control module (4) controls the working cycle of each frequency converter to start the sootblower, wait for a time t1, start the frequency converter, wait for a time t0, turn off the frequency converter, wait for a time t1, turn off the sootblower, wait for a time t2, and switch to control the next sootblower in sequence.

10. The automatic variable frequency sonic soot blowing control system according to claim 9, characterized in that: It also includes a sound wave detection module (5), a three-dimensional judgment module (6), an emergency cleaning module (7) and a gap processing module (8); The soot blowing control module (4) sends a detection signal to the sound wave detection module (5) after completing the cycle according to the setting information; The acoustic wave detection module (5) includes an ultrasonic scanner (51) preset in the furnace. After receiving the detection signal, the acoustic wave detection module (5) starts the ultrasonic scanner (51), receives the scanning result of the ultrasonic scanner (51) and generates an ultrasonic three-dimensional image, and sends the ultrasonic three-dimensional image to the three-dimensional judgment module (6); The data storage module (1) is preset with a normal ultrasonic three-dimensional image; The three-dimensional judgment module (6) calls the normal ultrasonic three-dimensional image stored in the data storage module (1). After receiving the ultrasonic three-dimensional image, the three-dimensional judgment module (6) compares the ultrasonic three-dimensional image with the normal ultrasonic three-dimensional image to judge whether a bulge or a gap appears on the ultrasonic three-dimensional image. If it is judged that a bulge appears on the ultrasonic three-dimensional image, a bulge alarm signal is output; if it is judged that a gap appears on the ultrasonic three-dimensional image, a gap alarm signal is output; The emergency cleaning module (7) receives the bulge alarm signal output by the three-dimensional judgment module (6), determines the center point of the bulge on the ultrasonic three-dimensional map according to the bulge alarm signal, selects a sonic soot blower within the influence range with the center point as the center, increases the output power of the selected sonic soot blower and starts the selected sonic soot blower, and controls the sonic detection module (5) to start the ultrasonic scanner (51); The gap processing module (8) receives the gap alarm signal output by the three-dimensional judgment module (6), determines the center point of the gap on the ultrasonic three-dimensional map according to the gap alarm signal, selects a sonic soot blower within the influence range with the center point as the center, obtains the wall material and ambient temperature where the gap is located, calculates the resonant frequency of the gap in combination with the gap shape, and adjusts the output power of the selected sonic soot blower until the sonic frequency of the sonic soot blower is lower than the calculated resonant frequency.

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