CN102500525B - Spray coating method of anti-corrosive paint on inner wall of fire tube - Google Patents
Spray coating method of anti-corrosive paint on inner wall of fire tube Download PDFInfo
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- CN102500525B CN102500525B CN201110310456.4A CN201110310456A CN102500525B CN 102500525 B CN102500525 B CN 102500525B CN 201110310456 A CN201110310456 A CN 201110310456A CN 102500525 B CN102500525 B CN 102500525B
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Abstract
The invention provides a spray coating method of an anti-corrosive paint on the inner wall of a fire tube. The spray coating method comprises the following steps of: (1) installing a fan at one end of the fire tube, and starting the fan to control the air speed in the fire tube so as to remove impurities inside the fire tube; and (2) ejecting or perfusing paint to the fire tube from the other end, sucking the paint by the fan, and throwing onto the inner wall of the fire tube so as to form an anti-corrosive layer, wherein the spray coating of the paint sequentially comprises the spray coating of primer, intermediate paint and finishing coat, drying is carried out after each layer of paint is spray-coated, and the air speed in the fire tube is controlled by the fan during the spray coating process, so as to finish the spray coating of anti-corrosive paint on the inner wall of the fire tube. The spray coating method provided by the invention has the characteristics of simplicity in operation, rapidness and safety, has good anticorrosive effect, and can greatly save construction time and fund investment for anticorrosion of the inner wall of the fire tube.
Description
Technical field
The present invention relates to spray painting technical field, specially refer to and be applicable to the large smoke pipe inwall of difficulty of construction to carry out a kind of simple and effective paint spraying method of degree of depth corrosion-resistant.
Background technology
In boiler fired coal process, can produce a lot of corrosive gas, steam and other impurity.When these flue gases pass through from smoke pipe, can produce corrosiveness to smoke pipe, and more arrive that corrosion condition is more serious below, this is mainly because flowing along with flue gas, temperature reduces gradually, can condensation go out acid solution, and acid solution is along with flue gas is pushed ahead with certain speed along smoke pipe diapire, so just smoke pipe diapire has been formed to erosion corrosion, thereby accelerated the destruction to smoke pipe.A lot of smoke pipes adopt stainless steel as material, although there is very strong corrosion resistance, but flue gas has certain temperature, complicated component corrosivity forms by force and easily erosion corrosion, under long-time service condition, the slowly attenuation perforation that is even corroded of corrosion resistant plate, therefore needs regularly to smoke pipe, safeguard processing.General maintaining method comprises removable parts smoke pipe, outer wall mending-leakage, inwall touch-up paint, and still, for the pipeline of having built up, such method for maintaining all cost consuming time is too many, and implements difficult.
Smoke pipe is as a passage of flue gas, it will extend to different places along with processing procedures such as the dedusting of flue gas, desulphurization denitrations, therefore can form very complicated pipeline configuration, is not straight line, the spray gun of some automatic coatings can not import, and this has just strengthened the difficulty of construction of inwall japanning.For example long vertical section is connecting the flue that long horizontal sections and multiple bending sections divide, and when externally import department is used high-pressure spray gun to spray merely, because range is limited, can only process one section of smoke pipe of import department; And in people enters into smoke pipe when construction (smoke pipe diameter > 600mm), due to inner space sealing, make construction have great risk, can greatly increase the engineering time simultaneously, and need to drop into huge.In addition, most of smoke pipe is all maked somebody a mere figurehead, and it is vertical also having some, and a lot of paint company to carry out inner wall anti-corrosive be to be that then safety rope enters smoke pipe and implement to brush or spraying mostly, there is so very large danger.First, if hang constructor's safety rope, go wrong, constructor is extremely dangerous.Secondly, when constructor enters pipeline construction, if do not allow narrow and small pipeline space maintain enough fresh air circulations, constructor is easy to suffocate.In addition, because the organic solvent volatility in paint is very strong and it is irritant to be with, especially in pipeline, use spray gun spraying, be easy to allow constructor suffocate even poisoning.
Summary of the invention
The object of the invention is to overcome the shortcoming existing in prior art, a kind of spraying method of simple, effective, safe smoke pipe inner wall anti-corrosive paint is provided, can implement to add benefit antifouling paint to the inwall of built pipeline, especially can solve some smoke pipe inner wall anti-corrosive as large in difficulty of construction such as suspended pipings spraying difficult problems.
Object of the present invention is achieved through the following technical solutions:
A kind of spraying method of smoke pipe inner wall anti-corrosive paint, by regulating suitable wind speed, smoke pipe is brought in spraying paint of spraying or inject to high port into, and paint is coated on smoke pipe inwall uniformly, and it is dry to accelerate paint, by this method simply, easily and fast, in smoke pipe, spray anticorrosive paint, form an effective anticorrosive coat, especially the thick fine and close anticorrosion belt of one deck is formed on the bottom in smoke pipe, stop metal to contact with the sour water of air and condensation, effectively prevent that smoke pipe from corroding attenuation and even boring a hole.The number of plies of corrosion resistant coating is depending on anticorrosion degree, and generally severe is anticorrosion need to spray priming paint, intermediate coat and three kinds of anticorrosive paints of finish paint successively.Specifically comprise the steps:
(1) blower fan is installed in smoke pipe one end, is opened wind speed in air-blower control smoke pipe, remove the foreign material in smoke pipe; Concrete operations are to open blower fan, and wind speed is adjusted to 10～20m/s operation, 20～45min, and object is to remove the ponding in some residues of inner-walls of duct and air-dry pipe, for spraying is prepared;
(2) in from the smoke pipe other end to pipe, spray or perfusion paint, paint is sucked to get rid of by blower fan and on inside pipe wall, forms anticorrosive coat, the spraying of described paint is followed successively by the spraying of priming paint, intermediate coat and finish paint, after every layer of paint spraying, all to be dried, during spraying, use wind speed in air-blower control smoke pipe, thereby complete the spraying of smoke pipe inner wall anti-corrosive paint.
Described assembling is in the lower one end of smoke pipe, and is provided with detection valve in the smoke pipe bottom near blower fan one end, for detection of the spraying effect of paint.
The main component of the described priming paint of step (2), intermediate coat and finish paint is respectively vinylester resin, vinylester resin glass flake, acrylic outdoor enamel.
Described priming paint comprises heat-resistance type vinylester resin paint base, aqueous epoxy curing agent and trimerization DMP-30 promoter, and the mass ratio of three components is 20: 0.2: 0.15.
Described intermediate coat is that heat-resistance type vinylester resin glass flake paint base and aqueous epoxy curing agent are with the mixing of 50: 1 mass ratioes.
Described finish paint is acrylic outdoor enamel paint base and the aqueous epoxy curing agent mixing of 8: 1.5 in mass ratio.
Described priming paint, intermediate coat and finish paint all add more than 20% epoxide diluent of mass fraction in preparation, avoid painting too thickness and spray inhomogeneous.
Described priming paint is divided into precoating and overcoating, and precoating sprays with High Pressure Gun, and during spraying, wind speed is 5～15m/s, and paint can be sprayed onto on tube wall equably; At detection valve place, with the long rod that is tied with white gauze, stretch into pipe inspection paint and whether be drawn onto pipe end, if not, tune up rotation speed of fan or adjust thin spraying.With spray gun, be to be covered by less paint droplet in order to ensure inside pipe wall before, better anticorrosion.Overcoating adopts flexible pipe perfusion, next wind speed is further tuned up, and adopts with flexible pipe and injects with larger flow (10～20m/s) at high port, and the paint of injection is sucked to get rid of by blower fan and on inside pipe wall, forms the thicker finer and close anti-corrosion primer layer of one deck.Operation a period of time is just being detected valve place scraping tube wall once with the long rod that teases white gauze, checks the paint thickness of detection valve place inner-walls of duct, reaches and needs the thickness of anticorrosion degree just can stop spraying paint.And concrete flow of paint, blower fan wind speed and spray time also will determine in conjunction with material elementses such as on-the-spot pipe range, caliber, stringing complexities.
Described in described step (1), the wind speed of removal of impurities is 10～20m/s; The wind speed of intermediate coat described in step (2) and finish paint spraying is 10～25m/s; Dry wind speed is 0.5～5m/s, and drying time is by the type decided of priming paint, but because the exhausting of blower fan is conducive to the organic solvent volatilization of paint, thus its drying time than with reference to drying time short.
Described epoxide diluent is a kind of in dimethylbenzene, toluene, acetone, ethylenediamine, dibutyl carboxylic acid.
Described aqueous epoxy curing agent is a kind of in imidazoles, diethylenetriamine, polyamide 6 50, HHPA, methyl tetrahydro phthalic anhydride, grass acid anhydrides.
The present invention has following advantage and beneficial effect with respect to prior art:
(1) the present invention is compared with prior art, simple to operate, and can greatly shorten the engineering time.The method only need be controlled wind speed and paint well, and with respect to artificial brushing or spraying, the method is easy to operate simple, and owing to there being the effect of blower fan, can accelerate the dry of paint.Engineering time of the present invention is not as good as 1/4 of conventional method required time in addition.
(2) the present invention is convenient carries out inner wall anti-corrosive to the large pipeline of some difficulty of construction.
(3) the present invention can carry out inwall to built pipeline and strengthens anticorrosionly, and greatly reduces costs.
(4) the present invention can make construction become safer.The present invention crawls in pipeline and constructs without constructor, only need control blower fan and paint injection outward at pipeline, almost without any danger.
(5) the present invention is more suitable for the anticorrosion of heavy corrosion flue.Corrosive fume is to be mainly deposited on duct bottom because flue gas condensing becomes acid solution to the anticorrosion of pipeline, add sweep of gases acid solution, has aggravated reacting of corrosive substance and metallic conduit.So we find that nearly all smoke pipe is all first to start corrosion from bottom, for the flue gas of a lot of severe corrosives, as power-plant flue gas, stainless smoke pipe bottom can be corroded through, can see that the corrosivity of acid solution under sweep of gases is strong completely.And the present invention drives paint drop to enter pipeline with blower fan wind speed to implement corrosion-resistant, when the paint drop injecting is larger, due to Action of Gravity Field, the paint film that duct bottom forms can be local thick more a lot of than other, this just in time can more effectively stop contacting of acid solution and air and metal, can effectively implement pipeline corrosion protection, so the present invention is well suited for the anticorrosion of heavy corrosion flue.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of spraying method of the present invention;
1: blower fan 2: low port 3: ball valve 4: abridged intermediate conduit 5: high port 6: paint injection place.
The specific embodiment
Below in conjunction with embodiment, the invention will be further described, but embodiment of the present invention are not limited to this.
Embodiment 1
This embodiment for certain desulfurizing tower of electric power plant after pilot-plant flue, in flue gas, heavy corrosion composition is mainly NO (100～500ppm), NO
2(1～30ppm), SO
2(10～700ppm), in addition, in flue gas, oxygen content is 5%～12%, cigarette temperature is 30～120 ℃.What during this smoke pipe design and construction, select is 304 stainless steel materials, and inside and outside wall does not all adopt anti-corrosion spray measure, due to washing away of condensation acid solution, has used after seven months, finds smoke pipe bottom attenuation, and seriously corroded, so need to adopt inner wall anti-corrosive measure to remedy.This smoke pipe overall length is 45m, and bore is 780mm, and all pipelines are maked somebody a mere figurehead entirely, and the difference in height of pipe ends mouth is up to 19m, and pipeline has the bending at 4 right angles, and concrete embodiment is as described below:
(1) because this smoke pipe low port 2 just had air-introduced machine originally, and power is enough large, thus only need be before blower fan the ball valve 3 of an one-inch of duct bottom welding at 1m place.
(2) open blower fan 1, wind speed is adjusted to 15m/s left and right, operation 30min, by the residual moisture in smoke pipe, dust, the removals such as the little grains of sand, are follow-up preparation of construction.Configure during this period priming paint, this priming paint comprises three components, SPE904-P heat-resistance type vinylester resin paint base, diethylenetriamine curing agent and trimerization DMP-30 promoter, mass ratio is 20: 0.2: 0.15, in order to make paint have better mobility, adding mass percent is 20% dibutyl carboxylic acid diluent.
(3) blower fan wind speed is adjusted to 7m/s left and right, first with spray gun, from port 5, spray priming paint, the flow of paint of spray gun is controlled to 500mL/min left and right, air flow control is in 100L/min left and right, with the long rod that is tied with gauze, from ball valve 3, put in inspection, find that on white gauze, occupying paint mist drips, illustrate that wind speed and gun spraying size are applicable to.After spraying 1h, wind speed is adjusted to 15m/s left and right, uses flexible pipe instead and inject priming paint from high port 5, flow of paint is 2L/min, after 20min, open ball valve 3, with the long rod that is tied with gauze, scrape smoke pipe inwall, find that inside pipe wall is with the certain thickness paint film of one deck, priming paint spraying is complete.
(4) wind speed is reduced to 4m/s, accelerates priming paint and be dried, be probably 3h drying time, when priming paint is fast dried, starts to allocate intermediate coat.This intermediate coat is two components, and SPE904-M heat-resistance type vinylester resin glass flake paint base and diethylenetriamine curing agent mix with the mass ratioes of 50: 1, adds equally the epoxide diluent of mass fraction 20% to improve the mobility of paint.
(5) wind speed is recalled to 15m/s again, with the flow of 2L/min, at port 5 places, inject intermediate coats, after 25min, use the same method and check at ball valve 3 places middle the paint film of having found adequate thickness, intermediate coat sprays complete.
(6) blower fan wind speed being adjusted to 4m/s is dried intermediate coat, be 2.5h drying time, allocate finish paint in complete intermediate coat is soon dry, finish paint is also two components, adopt B04-12 acrylic outdoor enamel paint base and diethylenetriamine curing agent to mix at 8: 1.5 in mass ratio, add equally the epoxide diluent (dibutyl carboxylic acid) of mass fraction 20% to improve the mobility of paint.
(7) wind speed is adjusted to 15m/s, with the flow injection finish paint of 1.5L/min, after 20min, finds at one-inch ball valve 3 places, to find that there is the finish paint of adequate thickness, stop finish paint and inject.
(8) wind speed is adjusted to 4m/s again, makes paint dry thoroughly, the organic solvent painting after operation 5h almost volatilizees complete, turns off blower fan by its natural air drying.
This embodiment is for the flue after certain steel plant's desulfurizing tower, and in flue gas, heavy corrosion composition is mainly NO (150～240ppm), NO
2(1～10ppm), SO
2(20～50ppm), in addition, in flue gas, oxygen content is 5%～10%, cigarette temperature is 50～80 ℃.What during this smoke pipe design and construction, select is 316 stainless steel materials, and inside and outside wall does not all adopt anti-corrosion spray measure, use the time more than a year after smoke pipe there is corrosion phenomenon in various degree everywhere.This section of smoke pipe overall length is 72m, and bore is 600mm, and section of tubing is maked somebody a mere figurehead, and the difference in height of pipe ends mouth reaches 5m, has the bending of 90 °, two place in pipeline.Because the material of this pipeline own is better, the degree that is corroded is not very too serious, thus this time anticorrosion adopt priming paint and finish paint two-layer anticorrosion.Concrete embodiment is as described below:
(1) the low one end of this smoke pipe is equipped with high-power air-introduced machine, and before blower fan, the duct bottom at 1m place is welded with the ball valve of three cun.
(2) open blower fan, wind speed is adjusted to 20m/s left and right, operation 30min, by the residual moisture in smoke pipe, dust, the removals such as the little grains of sand, are follow-up preparation of construction.Configure during this period priming paint, this priming paint batching is with embodiment 1.
(3) blower fan wind speed is adjusted to 10m/s left and right, first with spray gun, from high port 5, spray priming paint, the flow of paint of spray gun is controlled to 500mL/min left and right, air flow control is in 100L/min left and right, with the long rod that teases gauze, at three cun of ball valves, go out to detect paint droplet, illustrate that wind speed and spraying are suitable, after spraying 1h, wind speed is adjusted to 15m/s left and right, use flexible pipe instead and inject priming paint from high port 5, flow of paint is 2L/min, after 20min, with the long rod that is tied with gauze, at ball valve 3, go out to detect the paint film that tube wall has adequate thickness, stop priming paint spraying.
(4) wind speed is reduced to 5m/s, accelerates priming paint and be dried, be probably 2h drying time, when priming paint is fast dried, starts to allocate intermediate coat, and intermediate coat is prepared burden with embodiment 1.
(5) wind speed is recalled to 15m/s again, with the flow of 2L/min, at high port 5 places, inject intermediate coats, after 25min, use the same method and check at ball valve 3 places middle the paint film of having found adequate thickness, intermediate coat sprays complete.
(6) blower fan wind speed is adjusted to 3m/s dry to intermediate coat, be 3h drying time, allocates finish paint in complete intermediate coat is dry soon, and finish paint is prepared burden with embodiment 1.
(7) wind speed is adjusted to 25m/s, with the flow injection finish paint of 1.5L/min, after 25min, at ball valve place, finds the finish paint paint film of adequate thickness, stop finish paint and inject.
(8) wind speed is adjusted to 4m/s again, makes paint dry thoroughly, the organic solvent painting after operation 5h almost volatilizees complete, turns off blower fan by its natural air drying.
This embodiment is that in flue gas, heavy corrosion composition is mainly NOx (200～500ppm), SO for one section of flue after certain chemical plant toxic emission deduster
2(150～300ppm), NH
3(300～700ppm), hydrocarbon (more than 1000ppm).In addition, in flue gas, oxygen content is 5%～10%, and cigarette temperature is 50～100 ℃.What during this smoke pipe design and construction, select is 304 stainless steel materials, inside and outside wall is all sprayed with one deck japanning, due to washing away of condensate corrosion liquid, used after a period of time, find that smoke pipe bottom coating bubbles serious, there is corrosion phenomenon in various degree everywhere in steel pipe, so need to adopt inner wall anti-corrosive measure to safeguard.This section of smoke pipe overall length is 30m, and bore is 200mm, and pipeline is mainly attached on wall or ground, because flue gas corrosion is very strong, so to add prime, intermediate coat and three layers of corrosion-inhibiting coating of finish paint, concrete embodiment is as described below:
(1) this smoke pipe low port 2 is equipped with a blower fan, and the duct bottom at the front 1m of blower fan place is welded with the ball valve 3 of an one-inch.
(2) open blower fan, wind speed is adjusted to 15m/s left and right, operation 30min, by the residual moisture in smoke pipe, dust, the removals such as the little grains of sand, are follow-up preparation of construction.Configure during this period priming paint, priming paint is prepared burden with embodiment 1.
(3) blower fan wind speed is adjusted to 5m/s left and right, first with spray gun, from port 5, spray priming paint, the flow of paint of spray gun is controlled to 200mL/min left and right, air flow control is in 50L/min left and right, at ball valve, 5 places are checked through paint droplet with the long rod that is tied with gauze, illustrate that wind speed and spraying are suitable, after spraying 45min, wind speed is adjusted to 10m/s left and right, use flexible pipe instead and inject priming paint from high port 5, flow of paint is 1L/min, after 20min, with the long rod that is tied with gauze, be checked through the paint film that inside pipe wall has adequate thickness again, stop priming paint and inject.
(4) wind speed is reduced to 3m/s, accelerates priming paint and be dried, be probably 3h drying time, when priming paint is fast dried, starts to allocate intermediate coat, and intermediate coat is prepared burden with embodiment 1.
(5) again wind speed is recalled to 10m/s, flow with 1L/min injects SPE904-M heat-resistance type vinylester resin glass flake at high port 5 places, after 25min, at ball valve 3 places, check and find that inside pipe wall intermediate coat paint film reaches adequate thickness, stops intermediate coat and injects.
(6) blower fan wind speed is adjusted to 3m/s dry to intermediate coat, be 2.5h drying time, allocates finish paint in complete intermediate coat is dry soon, and finish paint is prepared burden with embodiment 1.
(7) wind speed is adjusted to 10m/s, the flow injection finish paint with 1L/min, detects finish paint film thicknesses at ball valve 3 places after 20min enough, stops finish paint and injects.
(8) wind speed is adjusted to 3m/s again, makes paint dry thoroughly, the organic solvent painting after operation 4h almost volatilizees complete, turns off blower fan by its natural air drying.
Claims (5)
1. a spraying method for smoke pipe inner wall anti-corrosive paint, is characterized in that, comprises the steps:
(1) blower fan is installed in smoke pipe one end, is opened wind speed in air-blower control smoke pipe, remove the foreign material in smoke pipe;
(2) in from the smoke pipe other end to pipe, spray or perfusion paint, paint is sucked to get rid of by blower fan and on inside pipe wall, forms anticorrosive coat, the spraying of described paint is followed successively by the spraying of priming paint, intermediate coat and finish paint, after every layer of paint spraying, all to be dried, during spraying, use wind speed in air-blower control smoke pipe, thereby complete the spraying of smoke pipe inner wall anti-corrosive paint; Described priming paint is divided into precoating and overcoating, and precoating sprays with High Pressure Gun, and during spraying, wind speed is 5～15m/s; Overcoating adopts flexible pipe perfusion, and during perfusion, wind speed is 10～20m/s;
Described priming paint comprises heat-resistance type vinylester resin paint base, aqueous epoxy curing agent and trimerization DMP-30 promoter, and the mass ratio of three components is 20:0.2:0.15; Described intermediate coat is that heat-resistance type vinylester resin glass flake paint base and aqueous epoxy curing agent are with the mixing of 50:1 mass ratio; Described finish paint is acrylic outdoor enamel paint base and the aqueous epoxy curing agent mixing of 8:1.5 in mass ratio.
2. spraying method according to claim 1, is characterized in that, described priming paint, intermediate coat and finish paint all add more than 20% epoxide diluent of mass fraction in preparation.
3. spraying method according to claim 1, is characterized in that, described in described step (1), the wind speed of removal of impurities is 10～20m/s; The wind speed of intermediate coat described in step (2) and finish paint spraying is 10～25m/s; Dry wind speed is 0.5～5m/s.
4. spraying method according to claim 3, is characterized in that, described assembling is in the lower one end of smoke pipe; And be provided with detection valve in the smoke pipe bottom near blower fan one end.
5. spraying method according to claim 1 and 2, is characterized in that, described epoxide diluent is a kind of in dimethylbenzene, toluene, acetone, ethylenediamine, dibutyl carboxylic acid;
Described aqueous epoxy curing agent is a kind of in imidazoles, diethylenetriamine, polyamide 6 50, HHPA, methyl tetrahydro phthalic anhydride, grass acid anhydrides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110310456.4A CN102500525B (en) | 2011-09-30 | 2011-09-30 | Spray coating method of anti-corrosive paint on inner wall of fire tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110310456.4A CN102500525B (en) | 2011-09-30 | 2011-09-30 | Spray coating method of anti-corrosive paint on inner wall of fire tube |
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| CN102500525B true CN102500525B (en) | 2014-05-07 |
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|---|---|---|---|
| CN201110310456.4A Expired - Fee Related CN102500525B (en) | 2011-09-30 | 2011-09-30 | Spray coating method of anti-corrosive paint on inner wall of fire tube |
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| CN106085146A (en) * | 2016-07-29 | 2016-11-09 | 无锡信大气象传感网科技有限公司 | A kind of chimney climbing ladder antifouling paint and preparation method thereof |
| CN108080236B (en) * | 2017-11-30 | 2021-12-21 | 蚌埠青果科技服务有限公司 | Method for improving corrosion resistance of desulfurization dust remover shell |
| CN110302948A (en) * | 2019-06-28 | 2019-10-08 | 中船黄埔文冲船舶有限公司 | A kind of underwater coating construction method of ship |
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| CN1208138C (en) * | 2002-09-30 | 2005-06-29 | 姜宜川 | Apparatus and process for spraying inner wall of electric heating water supply steel-plastic composite pipe |
| CN101168976B (en) * | 2007-11-21 | 2011-05-11 | 上纬（上海）精细化工有限公司 | Antisepsis method for fire coal tail gas funnel |
| CN101823065A (en) * | 2010-04-30 | 2010-09-08 | 苏州德华机械设备有限公司 | Device for descaling and derusting for pipeline and coating to form anti-corrosion coat and application method |
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Effective date of registration: 20180205 Address after: Panyu District Luopu Street Xiajiao village in Guangzhou City, Guangdong province 510000 Guangzhou Xinji Shaxi Hotel Supplies Expo (Xiajiao area north gate) two floor shops Patentee after: Guangzhou Xin Wang Gu Environmental Protection Technology Co., Ltd. Address before: 510640 Tianhe District, Guangdong, No. five road, No. 381, Co-patentee before: Guangzhou Jingyi Machinery Co., Ltd. Patentee before: South China University of Technology |
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Granted publication date: 20140507 Termination date: 20190930 |