CN110508566A - Surface descaling method based on multifrequency leakage supersonic guide-wave - Google Patents
Surface descaling method based on multifrequency leakage supersonic guide-wave Download PDFInfo
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- CN110508566A CN110508566A CN201910788689.1A CN201910788689A CN110508566A CN 110508566 A CN110508566 A CN 110508566A CN 201910788689 A CN201910788689 A CN 201910788689A CN 110508566 A CN110508566 A CN 110508566A
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- fouling
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- fluid load
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
- B08B7/026—Using sound waves
- B08B7/028—Using ultrasounds
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Abstract
The present invention relates to a kind of surface descaling methods based on multiple frequency ultrasonic guided wave, belong to descalling technique field.This method technical essential is as follows: for the medium fouling surface containing fluid load, transducer module is remotely from the position in fluid load fouling region, multifrequency continuous pump voltage signal is generated by signal generating module, transducer module is acted on after the amplification of signal amplification module, generate the supersonic guide-wave propagated along structural body, when guided waves propagation to the fouling region for having fluid load, portion of energy leaks in liquid, the cavitation of generation can effectively Ground shock waves fouling, achieve the purpose that remove fouling.The present invention realizes that remote online removes fouling using the big advantage of supersonic guide-wave coverage area, and equipment to be cleaned does not have to stop production, more uniform can be effectively removed fouling without the method for detaching equipment, while multi-frequency excitation, improve removal rate.This method is high-efficient, and sphere of action is big, and not can cause environmental pollution.
Description
Technical field
The present invention relates to a kind of surface descaling methods based on multiple frequency ultrasonic guided wave, belong to descalling technique field.
Background technique
Be in the industrial equipment of wet environment or fluid heat exchange zone, as boiler, heat exchanger, recirculating cooling water system with
And membrane filtration system (sea water desalination) etc., heating surface always has dirt deposition.Dirt is usually consolidated what is contacted with fluid
Body surface area gathers, and exists in the form of solid-state or soft gunk etc..Surface scale can be such that equipment heat transfer coefficient declines, and cause
Production capacity decline, increases production energy consumption.If do not handled in time dirt, it is also possible to cause equipment to occur mechanical
Failure and hang-up, cause serious industrial accident.
Mainly there are Mechanical Method, high-pressure water jet method, chemical method and ultrasound for the descaling method on industrial equipment surface at present
Method.Mechanical Method mainly utilizes the tools such as spatula, milling cutter and wire brush to remove fouling, and this method can expend a large amount of human resources, needs
It wants equipment to stop production, can not achieve online removal, and there is the blind area of removal.High-pressure water jet method is miscarried using high pressure water
Raw fluid dynamic energy abolishes surface scale, and the method, while can not be real main disadvantage is that will cause the waste of water resource
Present line removes fouling；Chemical method is chemically reacted using specific chemical reagent with dirt, eliminates fouling to reach
Purpose, chemical method scale removal can set damage, while may can cause environmental pollution.Ultrasonic method is removed based on ultrasound cavitation effect
Surface smut.Traditional ultrasonic method, object to be cleaned immerse in the sink containing cleaning solution, and energy converter is attached to sink bottom
Portion, the high-frequency vibration that energy converter generates enter in cleaning solution, generate ultrasound cavitation effect and are removed to object surface fouling.Cause
This, traditional ultrasonic method needs to dismantle equipment, and so as to cause the interruption of production, and this method is small in the presence of removal range
The shortcomings that.
Surface descaling method based on multiple frequency ultrasonic guided wave can remove online the interior fouling on industrial equipment surface.
The supersonic guide-wave propagated in equipment solid dielectric has partial compromise into liquid water ballast, and the cavitation effect of generation can be effective
Removal surface smut.This method can remove the wider fouling region of range using the long advantage of supersonic guide-wave propagation distance, together
When can realize on-line operation.Multi-frequency excitation can improve single-frequency poor removal effect and non-uniform disadvantage simultaneously, improve and remove
Dirty efficiency.
Summary of the invention
The invention proposes a kind of surface descaling method based on multiple frequency ultrasonic guided wave, technical solution is divided into following steps:
For the medium fouling surface containing fluid load, transducer module is remotely from the position in fluid load fouling region
It sets, multifrequency continuous pump voltage signal is generated by signal generating module, act on energy converter mould after the amplification of signal amplification module
Block, generates the supersonic guide-wave propagated along structural body, and when guided waves propagation to the fouling region for having fluid load, portion of energy is leaked
Into liquid, the cavitation of generation can effectively Ground shock waves fouling, achieve the purpose that remove fouling.
The surface descaling method based on multiple frequency ultrasonic guided wave, it is characterised in that using leakage supersonic guide-wave in medium
The cavitation effect that fluid load generates is removed surface scale.
The surface descaling method based on multiple frequency ultrasonic guided wave, it is characterised in that pumping signal is containing multiple frequencies
The signal of component, and the value of each frequency component is in 20KHz or more.
The signal generating module, can be multi-channel data acquisition board, be also possible to using microprocessor as core
Module occurs for integrated signal.
The amplification module can use high frequency power amplifier, can also use high-voltage power operational amplifier.
The transducer module is made of single or multiple PZT (piezoelectric transducer)s, and the core of energy converter is piezoelectric material, can
Mechanical energy is converted electrical energy into based on piezoelectric effect.
The surface descaling method based on multiple frequency ultrasonic guided wave, it is characterised in that this method is suitable for including plate knot
Various structures body surface smut removal including structure and tubular structure.
The invention belongs to surface descalling technique fields, are suitable for removal structural body surface smut, are covered using supersonic guide-wave
Realize that remote online removes fouling apart from big advantage, equipment to be cleaned does not have to stop production, without detaching equipment, while multifrequency
The method of excitation more uniform can be effectively removed fouling, improve removal rate.This method is compared with traditional descaling method, effect
Rate is high, and sphere of action is big, and not can cause environmental pollution.
Detailed description of the invention
Fig. 1 is the operation schematic diagram of the method for the present invention；
Fig. 2 is energy converter used in example；
Fig. 3 is displacement-frequency characteristic curve diagram that scanning laser vialog obtains the test of energy converter；
In Fig. 1,1- signal generating module, 2- amplification module, 3- energy converter, 4- guided wave, 5- body structure surface, 6- leakage energy
Amount, 7- dirt, 8- cavitation effect, 9- fluid load；
In Fig. 2,1- aluminum top base, 2- piezoelectric ceramic piece, 3- aluminum plinth
Specific embodiment
Embodiments of the present invention are described in detail with reference to the accompanying drawing.
1. frequency-selecting is tested
Using single oblique firing angle energy converter, as shown in Figure 2.Energy converter is made of aluminum plinth and piezoelectric material,
Energy converter is tested using laser scanning vialog first.Swept-frequency signal is generated by signal generator and is input to oblique transducing
Device, scanning laser vialog, which is tested and carries out FFT (Fast Fourier Transform (FFT)), obtains energy converter displacement vibration at different frequencies
Characteristic, transducer displacement-frequency characteristic are as shown in Figure 3.According to test result, energy converter is respectively in frequency
There is displacement peak value when 22.789KHz, 38.125KHz and 44.437KHz, energy converter at crest frequency there is good electroacoustic to turn
Change efficiency.In order to improve cavitation scale removal effect, selects tri- frequencies of 22.879KHz, 38.125KHz and 44.437KHz to be used as and remove
The multifrequency component of dirty pumping signal.
2. scale removal is tested
Experiment is divided into four groups, and the stainless steel plate for covering calcium carbonate layer to four pieces carries out scale removal experiment, the size of stainless steel plate:
Long 50cm, wide 10cm, thick 0.2cm.Four pieces of stainless steel plates obtain calcium carbonate scale layer, calcium carbonate under identical experiment condition
The length of dirty area is 18cm.
Experiment is divided into four groups, and particular technique process is as follows:
(1) single transducer is attached to end surface of the steel plate far from dirty layer with epoxy resin AB glue, adheres to dirty layer
Steel plate one end is immersed in the sink equipped with water.
(2) it is programmed on computers by LabVIEW and generates digital signal, first three groups are single-frequency scale removal experiment, experiment excitation
Signal is shown below:
S (t)=A0sin(2πft)
F is 22.789KHz or 38.125KHz or 44.437KHz, A0It is amplification voltage amplitude.
4th group is tested for multifrequency scale removal, and experiment pumping signal is shown below:
S (t)=A0(sin(2πf1t)+sin(2πf2t)+sin(2πf3t))
f1=22.789KHz, f2=38.125KHz, f3=44.437KHz, A0It is amplification voltage amplitude.22.789KHz,
38.125KHz, 44.437KHz are set as the multifrequency component of pumping signal by the crest frequency under laser vibration measurer test.
(3) digital signal generated on computer is conversion by (DAQ) digital-to-analogue conversion of NI USB6366 Data Acquisition Card
For analog voltage signal.
(4) amplitude is increased to 300V by HFVP-83A power amplifier by the voltage signal of Data Acquisition Card outputp-p,
(5) amplified voltage signal divides two-way to export, and output is connected to energy converter all the way, and energy converter will based on piezoelectric effect
Voltage signal is converted to mechanical oscillation, and another output is connected to Imtech, U.S. MDO3034 hybrid domain oscillograph observation waveform.
(6) energy converter mechanical oscillation generate the supersonic guide-wave propagated in the medium, remove dielectric surface based on cavitation effect
Fouling.
The steel plate for adhering to calcium carbonate scale layer to four pieces has carried out the experiment of four groups of above process, and four groups of experiments are believed in addition to excitation
Number different outer, other processes are consistent, and the pumping signal of four groups of experiments is as follows:
First group: s (t)=300sin (2 π * 22789*t)
Second group: s (t)=300sin (2 π * 38125*t)
Third group: s (t)=300sin (2 π * 44437*t)
4th group: s (t)=300 (sin (2 π * 22789*t)+sin (2 π * 381258*t)+sin (2 π * 44437*t))
3. experimental result
For quantitative analysis scale removal effect, removal rate R is introduced:
WrIt is the dirt total weight of scale removal experiment removal, WtThe total weight of dirt before scale removal experiment.
Table 1 tests descaling rate
As shown in Table 1, multi-frequency excitation scale removal is tested lower removal rate and is tested higher than single-frequency.The result shows that multi-frequency excitation can be with
Improve scale removal effect.Therefore, the surface On Line Foul Removing Technology method proposed by the present invention based on multifrequency leakage supersonic guide-wave can be to medium
Surface scale is uniformly effectively removed.
The above, one of preferred embodiment only of the present invention, when not departing from the principle of the present invention, to the present invention
Embodiment makes variation, modification, replacement and deformation and all falls in the scope of protection of the present invention.
Claims (5)
1. a kind of surface descaling method based on multiple frequency ultrasonic guided wave, it is characterised in that the following steps are included:
For the medium fouling surface containing fluid load, transducer module is remotely from the position in fluid load fouling region,
Multifrequency continuous pump voltage signal is generated by signal generating module, acts on transducer module after the amplification of signal amplification module,
Generate the supersonic guide-wave propagated along structural body, when guided waves propagation to the fouling region for having fluid load, portion of energy is leaked to
In liquid, the cavitation of generation can effectively Ground shock waves fouling, achieve the purpose that remove fouling.
2. the surface descaling method according to claim 1 based on multiple frequency ultrasonic guided wave, it is characterised in that super using leakage
The cavitation effect that guided Waves generate in media fluid load is removed surface scale.
3. the surface descaling method according to claim 1 based on multiple frequency ultrasonic guided wave, it is characterised in that pumping signal is
Signal containing multiple frequency components, and the value of each frequency component is in 20KHz or more.
4. signal generating module according to claim 1, can be multi-channel data acquisition board, it is also possible to micro process
Device is that module occurs for the integrated signal of core.Amplification module can use high frequency power amplifier, can also use high-voltage power
Operational amplifier.Transducer module is made of single or multiple PZT (piezoelectric transducer)s, and the core of energy converter is piezoelectric material, can
Mechanical energy is converted electrical energy into based on piezoelectric effect.
5. the surface descaling method according to claim 1 based on multiple frequency ultrasonic guided wave, it is characterised in that this method is applicable in
In the various structures body surface smut removal including plate structure and tubular structure.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114267896A (en) * | 2021-12-22 | 2022-04-01 | 福州大学 | Method for removing coating based on cavitation bubble collapse |
| CN116288373A (en) * | 2023-01-10 | 2023-06-23 | 天津科技大学 | Active protection method for metal surface corrosion based on linear frequency modulation ultrasonic guided wave |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114267896A (en) * | 2021-12-22 | 2022-04-01 | 福州大学 | Method for removing coating based on cavitation bubble collapse |
| CN116288373A (en) * | 2023-01-10 | 2023-06-23 | 天津科技大学 | Active protection method for metal surface corrosion based on linear frequency modulation ultrasonic guided wave |
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Application publication date: 20191129 |