CN203772703U - Steel chimney corrosion monitoring system based on non-contact type ultrasonic technology - Google Patents
Steel chimney corrosion monitoring system based on non-contact type ultrasonic technology Download PDFInfo
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- CN203772703U CN203772703U CN201420164822.9U CN201420164822U CN203772703U CN 203772703 U CN203772703 U CN 203772703U CN 201420164822 U CN201420164822 U CN 201420164822U CN 203772703 U CN203772703 U CN 203772703U
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- chimney
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Abstract
The utility model belongs to the field of industrial control and particularly relates to a steel chimney corrosion monitoring system based on a non-contact type ultrasonic technology. The system provided by the utility model is composed of an electromagnetic ultrasonic probe, a climbing device, an annular guide rail, a vertical guide rail, a controller, a data acquisition instrument and a computer. The steel chimney corrosion monitoring system utilizes an electromagnetic ultrasonic technology to finish the measurement on the thickness of a steel chimney in a non-contact state, the corrosion position and the corrosion risk of the chimney are obtained through comparative analysis on the thickness distribution of a steel inner barrel and on a thickness change tendency along with time, and then suggestions are provided to timely maintenance. The steel chimney corrosion monitoring system can be used for automatically, rapidly and accurately evaluating and analyzing healthy conditions of the steel chimney; the corrosion degree and the corrosion risk of the steel chimney are reduced and the working efficiency of the steel chimney, even a whole production process, is improved.
Description
Technical field
The utility model belongs to industrial control field, particularly a kind of steel stack corrosion monitoring system based on non-contact ultrasonic technology.
Background technology
In thermal power generation, metallurgy and chemical process, often provide heat with coal-burning boiler, and rely on the heat produce power of doing work.Coal, in the process of burning, except releases heat, also can produce sulphuric dioxide (SO
2), sulfuric anhydride (SO
3), oxynitrides (NO
x), the accessory substance such as chloride, fluoride, flying dust and slag.If these accessory substances are not carried out to suitable disposal and utilization, production, life that can be to environment, vegeto-animal health and the mankind after discharge produce disastrous effect, as cause the mankind respiratory system and the nervous system disease, formation photo-chemical smog, produce greenhouse effect and ozone hole, formation acid rain and cause the corrosion of metal material.
For the drain facility-chimney in coal combustion process, what should attach the importance is the material that can be dissolved in flue gas moisture and form acid solution, as SO
2, SO
3, NO
x, chloride, fluoride etc., these materials can form sulfuric acid, nitric acid, hydrochloric acid and hydrofluorite after dissolving, the structural supports of chimney is produced to serious corrosion as concrete and steel, to the related facility of chimney and fume emission, until whole production technology is produced to harm.
In order to reduce SO
2, SO
3, NO
x, the harm that may cause such as chloride, fluoride, often by improving boiler combustion system (as take subregion burning and control for oxygen quotient), and use desulfurization and denitrification, reduce the content of discharge harmful substances from flue gases.But, although taked a series of measure, still can residual a small amount of objectionable impurities in flue gas, if wet desulphurization is to SO
2removal efficiency be 95% left and right, to SO
3removal efficiency be 50% left and right,, can decline through desulfurization flue-gas temperature after treatment meanwhile, produce the acid dew point phenomenon of condensing on can the inwall at chimney in the process of discharge.On inner wall of stack, the consequence of dewfall is to form one deck condensed fluid, this condensed fluid has very high acidity, its pH value is generally 2.0 or following, and after flue-gas temperature decline, can make chimney inside produce normal pressure, for condensed fluid provides driving force to the infiltration of inner wall of stack, therefore, even if the flue gas of process desulfurization and denitration processing still exists serious harmfulness concerning chimney.
For strengthening the resistance to corrosion of chimney; conventionally build one deck anticorrosive coat in the inside of chimney; this anticorrosive coat is prepared as vitrified tile-binder system as polyureas, inorganic-organic composite material as titanium alloy, organic material by corrosion resistant metal conventionally; because the cost of corrosion resistant metal is higher, therefore normally used is organic or inorganic-organic composite material.
Common chimney structure form is telescopic, using reinforced concrete tube as external support structure, builds steel inner cylinder therein as smoke removal facility, and at the internal construction anticorrosive coat of steel inner cylinder.There is not directly contact (the local point that is used for supporting object contact except) in steel inner cylinder, has so just reduced the risk that the agent structure thing (reinforced concrete tube) of chimney is corroded with xoncrete structure.Between reinforced concrete tube inner side and the outside of steel inner cylinder, conventionally build and have circular stair or elevator, for the examination and maintenance of chimney working condition.Now, chimney anticorrosion erosion target is exactly to delay the corrosion process of steel inner cylinder or safeguard that steel inner cylinder is not corroded, even because have anticorrosive coat inner construction of steel inner cylinder, but along with extend service time, due to the defect existing in the deteriorated of anticorrosive coat performance and anticorrosive coat building course, often make anticorrosive coat occur even obscission of crack, cause the condensed fluid of high acidity to migrate to the inside surface of steel inner cylinder, form corrosion cell, cause hydrionic separating out (cathode reaction) in the dissolving (anode reaction) of iron atom in steel and acid solution, cause the corrosion process of steel inner cylinder, and in macroscopic view, show as steel inner cylinder corrosion thinning and perforation phenomenon, cause the impaired and load-bearing capacity of the smoke discharging function of steel inner cylinder to decline, finally have to remove and rebuild, cause huge economic loss.
In order to strengthen the resistance to corrosion of steel inner cylinder, conventionally take to optimize function, the use electrochemical protection of inner anticorrosive coat and strengthen the measure such as monitoring and maintenance to steel inner cylinder.
Optimizing the inner anticorrosive coat function aspects of chimney: the patent (a kind of anticorrosion desulfuration chimney) of application number 201220241725.6 proposes the anticorrosive coat (comprising: resin bed, glass fibre structure layer and wear-resistant coat) at the internal construction composite structure of steel inner cylinder; The patent (corrosion protection system of the newly-built Steel Inner Core of Chimney wet desulphurization of thermal power plant) of application number 201220041422.X proposes to build in the inside of steel inner cylinder the anticorrosive coat forming with heat-proof epoxy anticorrosive paint layer, KP1 acid resistant adhesive mortar layer and light vitreous acid-proof ceramics face brick layer; The patent (anti-corrosion method of a kind of generating plant chimney and flue) of application number 200710006482.1 proposes to paste tetrafluoroethene plate as anticorrosive coat in the inside of chimney; The patent (a kind of Anti-corrosive chimney and chimney anticorrosion etching method) of application number 201110227739.2 proposes to build frp lining as anticorrosive coat in the inside of chimney.The article of Zhang Yanming (Zhang Yanming, the domestic and international chimney anticorrosion erosion of brief analysis technology, the 4th China's international corrosion control conference Technique Popularizing collected works, 2009, p.222-243) comparative study use the relative merits of the inner anticorrosive coat of chimney that different materials builds.Utilizing electrochemical principle to carry out aspect protection steel inner cylinder: the patent (cathode protection technology of wet desulphurization chimney) that application number is 201210139216.7 adopts the method for cathodic protection, the anode network being embedded in the acid-resistant layer of chimney inside by sacrifices is realized the protection to chimney.Aspect the monitoring to steel inner cylinder and safeguarding, application number is the temperature field that 201310104600.8 patent (assay method of a kind of desulfurization fume to chimney extent of corrosion) proposes to measure with infrared thermoviewer chimney outside, and by the abnormal temperature point in temperature field the extent of corrosion of " reckoning " chimney inside.
From the patent of having applied for and the article of having delivered, the emphasis that researcher in the past pays close attention to is anticorrosive coat method of construction, and the method for steel inner cylinder corrosion protection and extent of corrosion sign is carried out in a small amount of trial.But along with the chimney prolongation of service time, in the decay of anticorrosive coat action effect and building course, defect is difficult to avoid to the transmitting effect of condensed fluid, therefore to migrate to the inside surface of steel inner cylinder be time and position distribution problem to condensed fluid; The corrosion protection (as built the anticorrosive coat of various qualities and using cathodic protection) and the characterizing method (as measured the temperature field of chimney outside with infrared thermoviewer) that carry out all can not be realized comprehensive and lasting monitoring and the corrosion risk assessment to chimney holistic health; moreover; the method itself of carrying out " reckonings " chimney internal corrosion degree in independent infrared measurement of temperature mode is just worth discussion, because gentle failing to be convened for lack of a quorum produced significantly and affected the temperature-measuring results of infrared mode the light of chimney outside, sunshine.
Utility model content
For the deficiency of existing chimney corrosion monitoring and appraisal procedure, the utility model provides a kind of steel stack corrosion monitoring system based on non-contact ultrasonic technology, its target is the steel stack that inside has nonmetal anticorrosive coat, its implementation is to utilize electromagnetic acoustic wave technology, under non-contacting state, complete the measurement to steel stack thickness, by steel inner cylinder thickness profile data, and the steel inner cylinder thickness variation tendency of course in time, draw corrosion position and the corrosion risk of steel stack, for the maintenance of carrying out in time chimney is offered suggestions.Its objective is the assessment and the analysis that complete automatically, fast and accurately steel stack health status, reduce corrosion risk and the extent of corrosion of steel stack, improve the work efficiency of chimney self and even whole production technology.
A steel stack corrosion monitoring system based on non-contact ultrasonic technology, described corrosion monitoring system is made up of electromagnetic ultrasonic wave probe, climbing device, ring-shaped guide rail, longitudinal rail, controller, data collecting instrument and computing machine; Wherein said longitudinal rail is arranged in steel stack, vertically arranges along steel stack central axis direction; On described longitudinal rail, climbing device is set, described climbing device is guide rail back and forth movement longitudinally; On described climbing device, ring-shaped guide rail is set, described ring-shaped guide rail place plane is vertical with described longitudinal rail; Electromagnetic ultrasonic wave probe is set on described ring-shaped guide rail; Described climbing device is connected with the controller being arranged on outside steel stack, and described controller is connected with data collecting instrument, and described data collecting instrument is connected with computing machine.
Signalization processing module and step drive device in described climbing device.
A monitoring method for steel stack corrosion monitoring system based on non-contact ultrasonic technology, its concrete grammar is as follows:
The measuring position of electromagnetic ultrasonic wave probe is set: the closed-loop control system that the setting of measuring position is made up of computing machine, controller and climbing device completes, and realizes the setting of electromagnetic ultrasonic wave probe measurement position by the motion that drives climbing device and circular orbit;
Obtain measuring position and ultrasonic propagation time data: when electromagnetic ultrasonic wave probe arrives behind the measuring position of setting, control order electromagnetic ultrasonic wave probe is started working, and and data collecting instrument and collaborative computer work, complete the lengthwise position Y of climbing device, the hoop position of circular orbit
collection with ultrasonic propagation time t;
The calculating of steel inner cylinder thickness: the ultrasonic propagation time t that relies on electromagnetic ultrasonic wave probe and controller associated working to obtain, and the velocity of propagation v(of ultrasound wave in steel can or carry out actual test by inspection information and obtain), calculate the thickness T of steel inner cylinder by formula 1, coefficient 0.5 in formula 1 is because ultrasound wave is launched and reflected by the outside surface of steel inner cylinder at the inside surface of steel inner cylinder, then on the inside surface of steel inner cylinder, be detected again, therefore hyperacoustic traveled distance is the twice of steel plate thickness;
T=0.5vt formula 1
Set up
sequence: by the hoop position of the lengthwise position Y of measurements and calculations gained climbing device, circular orbit
with a sequence of thickness T composition of steel inner cylinder, this sequence has been set up the relation between measuring position and steel inner cylinder thickness;
Steel inner cylinder corrosion risk and corrosion position analysis: based on
sequence, utilizes computing machine to set up three-dimensional steel inner cylinder thickness distribution figure, for user presents the etch state figure of whole chimney intuitively; Meanwhile, utilize this to measure gained
sequence, sets up the thickness distribution figure at whole steel inner cylinder diverse location place, utilizes and measures gained in the past
sequence and the time of carrying out this measurement, calculate the steel inner cylinder diverse location place variation in thickness trend of course in time, draw corrosion risk and the corrosion position of steel inner cylinder;
Providing of maintenance suggestion: according to the size of corrosion risk, provide the particular location that need to keep in repair, and the time that need to keep in repair.
The beneficial effects of the utility model are:
1) non-contact measurement: adopt electromagnetic acoustic wave technology, realize non-contact measurement, avoided the impact of steel stack inner non-metallic anticorrosive coat on measuring process;
2) comprehensive measurement: by the longitudinal rail arranging in steel stack central authorities, and there is the climbing device of ring-shaped guide rail, realize the comprehensive measurement of steel inner cylinder along height and hoop;
3) measuring process robotization: by controller control climbing device and ring-shaped guide rail, realize the automatic control of measuring position, by computing machine, the duty of electromagnetic ultrasonic wave probe is arranged, and read the measurement data of electromagnetic ultrasonic wave probe, realize the automatic measurement of steel inner cylinder thickness;
4) foundation of measuring position-steel inner cylinder thickness relationship: by the drive unit in climbing device, realize determining of longitudinal and hoop measuring position, simultaneously in measuring process, measuring position-steel inner cylinder thickness can be mapped and store at each measuring point, therefore set up the corresponding relation of measuring position-steel inner cylinder thickness;
5) comprehensive assessment of corrosion risk and corrosion position: based on measuring position-steel inner cylinder thickness relationship, by the analysis of steel inner cylinder thickness distribution, and the steel inner cylinder variation in thickness trend of course in time, draw extent of corrosion, corrosion position and the corrosion risk of steel inner cylinder;
6) the automatic generation of maintenance suggestion: according to the comprehensive assessment to steel inner cylinder corrosion position and corrosion risk; according to corrosion risk size; provide the particular location that need to keep in repair, and the time that need to keep in repair (as: hard stop keeps in repair or keeps in repair to next maintenance period).
Brief description of the drawings
Fig. 1 is the apparatus structure schematic diagram of the utility model system;
Fig. 2 is the partial structurtes enlarged diagram of the utility model system;
Fig. 3 is the schematic flow sheet of the utility model system;
Fig. 4 is the three-dimensional steel inner cylinder thickness distribution of the utility model system gained schematic diagram;
Fig. 5 is the utility model system gained corrosion position view;
Fig. 6 is the utility model system gained corrosion risk assessment schematic diagram;
Number in the figure: 1-electromagnetic ultrasonic wave probe, 2-climbing device, 3-ring-shaped guide rail, 4-longitudinal rail, 5-controller, 6-data collecting instrument, 7-computing machine, 8-steel inner cylinder, the nonmetal anticorrosive coat of 9-.
Embodiment
The utility model provides a kind of steel stack corrosion monitoring system based on non-contact ultrasonic technology, below in conjunction with the drawings and specific embodiments, the utility model is described further.
A steel stack corrosion monitoring system based on non-contact ultrasonic technology, described corrosion supervisory system is made up of electromagnetic ultrasonic wave probe 1, climbing device 2, ring-shaped guide rail 3, longitudinal rail 4, controller 5, data collecting instrument 6 and computing machine 7; Wherein said longitudinal rail 4 is arranged in steel stack, vertically arranges along steel stack central axis direction; On described longitudinal rail 4, climbing device 2 is set, described climbing device 2 is guide rail 4 back and forth movements longitudinally; On described climbing device 2, ring-shaped guide rail 3 is set, described ring-shaped guide rail 3 place planes are vertical with described longitudinal rail 4; Electromagnetic ultrasonic wave probe 1 is set on described ring-shaped guide rail 3; Described climbing device 2 is connected with the controller 5 being arranged on outside steel stack, and described controller 5 is connected with data collecting instrument 6, and described data collecting instrument 6 is connected with computing machine 7.
The interior signalization processing module of described climbing device 2 and step drive device.
The hardware that a kind of steel stack corrosion monitoring system based on non-contact ultrasonic technology that this patent proposes comprises as shown in Figure 1.
Described electromagnetic ultrasonic wave probe 1, can with the non-contacting state of steel inner cylinder under, pass through galvanomagnetic effect, on the inside surface of steel inner cylinder 8, inspire ultrasound wave and survey the ultrasound wave being reflected back by steel inner cylinder 8 outside surfaces, its objective is and measure ultrasonic propagation to the required time of inside surface that is reflected back again steel inner cylinder 8 after the outside surface of steel inner cylinder 8, this time can be used for the calculating of steel inner cylinder 8 thickness.Electromagnetic acoustic technology is not subject to the impact of the nonmetal anticorrosive coat existing between electromagnetic ultrasonic wave probe 1 and steel inner cylinder 8; Meanwhile, whole probe is encapsulated in antiacid corrosion and resistant to elevated temperatures containment vessel, thereby can in the flue gas of high acidity, deep-etching, high dust and high temperature, work.Meanwhile, electromagnetic ultrasonic wave probe 1 is subject to the driving of ring-shaped guide rail 3, between electromagnetic ultrasonic wave probe 1 and controller 5, carries out communication.
Described climbing device 2, inside comprises signal processing module and step drive device, this signal processing module can carry out communication with controller 5 and step drive device, realizes longitudinally climbing and driving to ring-shaped guide rail 3 of guide rail 4 longitudinally.Climbing device 2 surfaces have antiacid corrosion and resistant to elevated temperatures coating, thereby the ability that can work in the flue gas of high acidity, deep-etching, high dust and high temperature.
Described ring-shaped guide rail 3, is installed on climbing device 2, and is fixedly connected with between electromagnetic ultrasonic wave probe 1, is subject to the driving of step drive device in climbing device, can in the flue gas of high acidity, deep-etching, high dust and high temperature, work.
Described longitudinal rail 4, is made up of the material of high temperature resistant, acid corrosion-resistant, the friction of resistance to particle, and the groove above it climbs for climbing device 2.
Described controller 5, can and electromagnetic ultrasonic wave pops one's head in 1, carry out communication between climbing device 2, data collecting instrument 6 and computing machine 7, can control and gather climbing device 2 and ring-shaped guide rail 3 positions, and control and obtain duty and the measurement data of electromagnetic ultrasonic wave probe 1.
Described data collecting instrument 6, can gather the climbing device 2 and ring-shaped guide rail 3 positions that are obtained by controller, and duty and the measurement data of electromagnetic ultrasonic wave probe 1.
Described computing machine 7, by and controller 5 and data collecting instrument 6 between carry out communication, control and obtain measuring position and the data of steel inner cylinder thickness, and to this data analysis, obtain corrosion position and the corrosion risk of steel inner cylinder, and the thickness distribution figure of three-dimensional steel inner cylinder, corrosion position, corrosion risk and user are carried out alternately.
A monitoring method for steel stack corrosion monitoring system based on non-contact ultrasonic technology, its concrete grammar is as follows:
The measuring position of electromagnetic ultrasonic wave probe 1 is set: the closed-loop control system that the setting of measuring position is made up of computing machine 7, controller 5 and climbing device 2 completes, and by driving the motion of climbing device 2 and circular orbit 3 to realize the pop one's head in setting of 1 measuring position of electromagnetic ultrasonic wave;
Obtain measuring position and ultrasonic propagation time data: when electromagnetic ultrasonic wave probe 1 arrives behind the measuring position of setting, controller 5 order electromagnetic ultrasonic wave probes 1 are started working, and and data collecting instrument 6 and computing machine 7 collaborative works, complete the lengthwise position Y of climbing device 2, the hoop position of circular orbit 3
collection with ultrasonic propagation time t;
The calculating of steel inner cylinder 8 thickness: rely on the ultrasonic propagation time t obtaining, velocity of propagation v(in conjunction with ultrasound wave in steel can or carry out actual test by inspection information and obtain), calculate the thickness T of steel inner cylinder 8 by formula 1, coefficient 0.5 in formula 1 is because ultrasound wave is launched and reflected by the outside surface of steel inner cylinder 8 at the inside surface of steel inner cylinder 8, then on the inside surface of steel inner cylinder 8, be detected again, therefore hyperacoustic traveled distance is the twice of steel plate thickness;
T=0.5vt formula 1
Set up
sequence: by measurements and calculations gained lengthwise position Y, hoop position
a sequence of thickness T composition with steel inner cylinder 8, the form of this sequence is as 50-30-15.8, (represent: at longitudinal height of 50 meters-on hoop, the steel plate thickness of the initial measurement position rotation 30 degree-measuring points that distance is set is 15.8mm), this sequence has been set up the relation between measuring position and steel inner cylinder 8 thickness;
Steel inner cylinder 8 corrodes position and corrosion risk analysis: based on
sequence, utilizes computing machine 7 to set up three-dimensional steel inner cylinder thickness distribution figure, presents intuitively the etch state figure of whole chimney as shown in Figure 4 to user, and the corrosion location drawing as shown in Figure 5; Meanwhile, utilize all of this measurement
sequence data, and measured gained in the past
sequence data, in conjunction with the time of carrying out this measurement, draws the corrosion risk of chimney as shown in Figure 6 by the variation tendency analysis of steel inner cylinder 8 thickness; As shown in Figure 6, the computing method of corrosion risk size are as follows: to different measuring points, all calculate the slope that measured last time and this measurement data forms, this slope is the attenuate value of steel plate thickness and the ratio of measuring intervals of TIME; Chamber is tested or can be recorded steel corrosion thinning speed under condensed fluid effect in chimney by the method for hanging film scene by experiment, as: 8.0mm/, this attenuate speed is theoretical limit slope; Therefore can obtain corrosion risk by calculating the slope of different measuring point and the ratio of theoretical limit slope, as: calculating this slope of certain measurement point is 4.0mm/, and its corrosion risk is 50%;
Providing of maintenance suggestion: according to the size of corrosion risk, provide the particular location that need to keep in repair in conjunction with corrosion position, and the time that need to keep in repair; Corrosion position as shown in Figure 6, wherein be given in the differing heights place of steel inner cylinder, along the different length place of the hoop direction of steel inner cylinder, the steel plate thickness figure of each position, this thickness chart represents with different patterns, between patterns and steel plate thickness, have corresponding relation, as shown in the legend on Fig. 5 right side, different patterns sides is corresponding steel plate thickness value; The method that this patent provides maintenance suggestion is as follows: if there is the measuring point that corrosion risk is greater than 80% in chimney, show that the anticorrosive coat at this place had lost efficacy or come off, can advise shutting down and keeping in repair at once; If there is the mensuration of corrosion risk at 40%-80% in chimney, can advise this point to keep in repair when shutdown is safeguarded in next time.The maintenance suggestion form providing is as follows: be highly 80 meters, hoop direction is 5 meters of, and coming off of anticorrosive coat occurred, answers hard stop to keep in repair; Be highly 80 meters, hoop direction is 18.75 meters of, and serious infiltration has occurred anticorrosive coat, and suggestion is keeped in repair at next maintenance cycle.
Claims (2)
1. the steel stack corrosion monitoring system based on non-contact ultrasonic technology, is characterized in that: described corrosion monitoring system is made up of electromagnetic ultrasonic wave probe (1), climbing device (2), ring-shaped guide rail (3), longitudinal rail (4), controller (5), data collecting instrument (6) and computing machine (7); Wherein said longitudinal rail (4) is arranged in steel stack, vertically arranges along steel stack central axis direction; Climbing device (2) is set on described longitudinal rail (4), and described climbing device (2) is guide rail (4) back and forth movement longitudinally; Ring-shaped guide rail (3) is set on described climbing device (2), and described ring-shaped guide rail (3) place plane is vertical with described longitudinal rail (4); Electromagnetic ultrasonic wave probe (1) is set on described ring-shaped guide rail (3); Described climbing device (2) is connected with the controller (5) being arranged on outside steel stack, and described controller (5) is connected with data collecting instrument (6), and described data collecting instrument (6) is connected with computing machine (7).
2. a kind of steel stack corrosion monitoring system based on non-contact ultrasonic technology according to claim 1, is characterized in that: the interior signalization processing module of described climbing device (2) and step drive device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420164822.9U CN203772703U (en) | 2014-04-04 | 2014-04-04 | Steel chimney corrosion monitoring system based on non-contact type ultrasonic technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420164822.9U CN203772703U (en) | 2014-04-04 | 2014-04-04 | Steel chimney corrosion monitoring system based on non-contact type ultrasonic technology |
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| CN203772703U true CN203772703U (en) | 2014-08-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940726A (en) * | 2014-04-04 | 2014-07-23 | 清华大学 | Steel chimney corrosion monitoring system and method based on non-contact ultrasonic technology |
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2014
- 2014-04-04 CN CN201420164822.9U patent/CN203772703U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940726A (en) * | 2014-04-04 | 2014-07-23 | 清华大学 | Steel chimney corrosion monitoring system and method based on non-contact ultrasonic technology |
| CN103940726B (en) * | 2014-04-04 | 2016-05-11 | 清华大学 | A kind of steel stack corrosion monitoring system and method based on non-contact ultrasonic technology |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 |
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| CF01 | Termination of patent right due to non-payment of annual fee |