CN204693475U - The novel anti-low-temperature corrosion waste-heat recovery device of the band adjustable boiler of power plant of temperature - Google Patents
The novel anti-low-temperature corrosion waste-heat recovery device of the band adjustable boiler of power plant of temperature Download PDFInfo
- Publication number
- CN204693475U CN204693475U CN201520441539.0U CN201520441539U CN204693475U CN 204693475 U CN204693475 U CN 204693475U CN 201520441539 U CN201520441539 U CN 201520441539U CN 204693475 U CN204693475 U CN 204693475U
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- Prior art keywords
- heat
- temperature
- air preheater
- air
- heat exchange
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- 238000005260 corrosion Methods 0.000 title claims abstract description 21
- 230000007797 corrosion Effects 0.000 title claims abstract description 21
- 239000002918 waste heat Substances 0.000 title claims abstract description 20
- 238000011084 recovery Methods 0.000 title claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 57
- 239000000571 coke Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 15
- 239000003546 flue gas Substances 0.000 abstract description 15
- 238000005516 engineering process Methods 0.000 abstract description 8
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000002253 acid Substances 0.000 description 6
- 239000008234 soft water Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Air Supply (AREA)
Abstract
The utility model relates to the novel anti-low-temperature corrosion waste-heat recovery device of a kind of band adjustable boiler of power plant of temperature, and comprise air preheater and auxiliary heat-exchanging interchanger, air preheater cold air inlet is connected with the hot-blast outlet of secondary unit; The offgas outlet of air preheater is communicated with the gas inlet of secondary unit; Cold air after secondary unit heat exchange enters into heat exchange further in air preheater, boiler exhaust gas after air preheater exchanges enters into further heat exchange in secondary unit heat and reclaims with the height realizing boiler tail flue gas waste heat, reaches the object of boiler energy-saving consumption reduction.By application heat pipe heat exchanging technology, the minimum wall temperature of air preheater is controlled, exhaust gas temperature can be controlled below 120 DEG C, not only ensure that the lowermost wall surface temperature of air preheater is not less than 95 DEG C, wall surface temperature can also be made to realize automatically regulating simultaneously, improve afterbody heat pipe wall temperature to improve, reach anticorrosion object, effective raising boiler efficiency 1 ~ 2%.
Description
Technical field
The utility model relates to the adjustable boiler tail low-temperature corrosion protection erosion flue gas waste heat utilization device of a kind of adaptive temperature, relates generally to boiler of power plant and the utilization of other boiler tail low-temperature flue gas waste heat, belongs to flue gas waste heat recovery technical field.
Background technology
Boiler of power plant tail air preheater easily causes heat exchange pipe plug ash and corrosion owing to condensing, design is considered to ensure the acid dew-point temperature of its metal heated lowermost wall surface temperature higher than fuel, to ensure its safe operation usually.The design exhaust gas temperature of general coal-fired boiler in power plant usually between 147-165 DEG C, higher than general coal fuel acids dew-point temperature more than 80 DEG C.However, air preheater lowermost wall surface temperature still can only reach 85 DEG C, only higher than acid dew-point temperature about 10 DEG C.So in the actual motion of boiler, the cold end corrosion phenomenon of air preheater happens occasionally, and brings hidden trouble to the safe operation of boiler.
Have to when boiler design at present, by improving exhaust gas temperature or using the nonmetallic materials (as enamel pipe) of heat transfer extreme difference to alleviate the generation of condensation and corrosion phenomenon, not tackle the problem at its root.And improve merely the waste that exhaust gas temperature certainly will cause a large amount of low-temperature energy sources, cannot recovery waste heat further.
Simultaneously according to the condition of production, after suitably adjusting boiler oil, acid dew-point temperature also has different change, but afterbody heat exchanger is because of cannot the significantly change of adaptation condition, directly carry out adjustment to wall temperature without any way to control, the efficiency that greatly limit boiler plays.
General conventional heat exchanger is pipe heat exchanger, and be roughly in a kind of multiple proportion between its metal heated lowermost wall surface temperature and thermal fluid discharge temperature, when namely exhaust gas temperature is 140 DEG C, corresponding minimum wall temperature is only about 70 DEG C.
General heat pipe heat exchanger was once once promoted in air preheater transformation, although to a certain extent exhaust gas temperature is reduced, but the lowermost wall surface temperature of its back-end surfaces still can lower than acid dew-point temperature, the corrosion that can not avoid condenses causes, and heat pipe ubiquity produces and accumulation on-condensible gas, aging gradually, thus heat transfer efficiency sharply declines.
Therefore how appropriate design boiler tail heat exchanger wall temperature, variable working condition is adjustable wall temperature, simultaneously can effective Mist heat recovering, reduce exhaust gas temperature, prevent dew point corrosion, raising boiler efficiency becomes the focus of this area research.
Summary of the invention
The purpose of this utility model is the shortcoming existed for solving above-mentioned prior art, the boiler tail low-temperature corrosion protection erosion flue gas waste heat utilization device providing a kind of adaptive temperature adjustable, reclaim with the height realizing boiler tail flue gas waste heat, the adjustable of air preheater tube wall dew-point temperature and adaptation boiler variable working condition adjusting range, reach the object of boiler energy-saving consumption reduction.
For arriving above-mentioned purpose, the utility model solves the technical scheme that its technical problem adopts and is
the novel anti-low-temperature corrosion waste-heat recovery device of a kind of band adjustable boiler of power plant of temperature, comprise air preheater and auxiliary heat-exchanging interchanger, air preheater cold air inlet is connected with the hot-blast outlet of secondary unit; The offgas outlet of air preheater is communicated with the gas inlet of secondary unit; Cold air after secondary unit heat exchange enters into heat exchange further in air preheater, and the boiler exhaust gas after air preheater exchanges enters into heat exchange further in secondary unit heat.
preferably, described secondary unit is three-stage heat exchanger.
Preferably, described three-stage heat exchanger is hot-pipe type heat-exchanger, and heat exchanger is vertically arranged: higher level's heat exchange end, intermediate heat exchange end, subordinate's heat exchange end; Subordinate's heat exchange end entrance end is communicated with the offgas outlet of air preheater; Middle rank heat exchange end is air heat-exchange end, and one end of air heat-exchange end is cool air inlet, the other end is hot-blast outlet, and hot-blast outlet is connected with the cold air inlet of air preheater, and the two ends of air exchange end are connected with air and switch bypass duct; Higher level's heat exchange end is water coke slurry end, and the two ends of water coke slurry end are respectively not for cold water enters end and hot water goes out end, cold water enter end and hot water go out to hold between be communicated with water bypass valve and pipeline.
Preferably, the arrival end of described water heat-exchange end is connected with pump and water tank.
The novel anti-low-temperature corrosion exhaust heat recovering method of the band adjustable boiler of power plant of temperature, air preheater is divided into high temperature section heat exchanging segment and low-temperature heat exchange section, boiler exhaust gas once carries out heat exchange through high-temperature heat transfer section and low-temperature heat exchange section, and cold air carries out heat exchange through low-temperature heat exchange section and high-temperature heat transfer section successively; Ensure that the wall temperature of air heat exchanger is higher than condensation temperature.
Operation principle of the present utility model is:
The purpose of this utility model is original air preheater to carry out subregion exactly: high temperature section and low-temperature zone, by heat exchange classification, is convenient to the wall temperature controlling air preheater.
High efficiente callback utilizes flue gas heat, by application heat pipe heat exchanging technology, the minimum wall temperature of air preheater is controlled (setting is adjustable also), exhaust gas temperature can be controlled below 120 DEG C, not only ensure that the lowermost wall surface temperature of air preheater is not less than 95 DEG C, can also, according to the change of boiler load, sulfur content in fuel, water content, make wall surface temperature realize automatically regulating simultaneously.
Heat exchange of heat pipe adopts integral structure or split-type structural, point high-temperature section heat exchanger and low-temperature zone heat exchanger.High-temperature section heat exchanger adopts heat pipe form or tubular type form, and inlet air temp controls more than 100 DEG C.Low-temperature zone heat exchanger adopts heat pipe form, and the heat exchange by heat pipe is divided into three grades, and upper level heat transferring medium is soft water or solidifying water, and middle one-level heat transferring medium is air, and next stage heat transferring medium is flue gas.
Low-temperature zone heat exchanger upper level and intergrade heat transferring medium are low-temperature receiver, and next stage heat transferring medium flue gas is thermal source.Upper level heat transferring medium is soft water or solidifying water, so level heat pipe section can be in samming medium, heat pipe heating surface lowermost wall surface temperature only has small gradient temperature drop, utilizes the isothermal of heat pipe to be improved by low-temperature region heat pipe wall temperature.
The amount of low-temperature zone heat exchanger cold junction upper level heat transferring medium, by motorized adjustment valve regulation, can carry out regulable control to heating surface minimum wall temperature, achieves the constant of wall surface temperature and heighten to turn down.
Meanwhile, by improving the temperature of cold junction heated medium (as air, water).The air be preheated can ensure the safety of subordinate's air preheater, solves cold end corrosion problem; By the waste heat in the air that heats and Water Sproading flue gas, achieve energy-conservation object.
Application heat pipe heat exchanging technology, remain efficient heat transfer that heat exchange of heat pipe has simultaneously, not only ensure that air preheater is safe and reliable, greatly extend its service life, can also reduce exhaust gas temperature significantly, energy-saving benefit is remarkable simultaneously.
The utility model compared to existing technology tool has the following advantages:
(1) pipe heat exchanger and heat exchange of heat pipe pluses and minuses are fully utilized, Appropriate application temperature range.Realize efficient, energy-conservation.
(2) the utility model novel anti-low-temperature corrosion waste-heat recovery device is the monolithic devices or the separation type heat exchange of heat pipe that devise a kind of three grades of heat exchange, and modular mode can be adopted to carry out designing, manufacture, transport, install, use technology etc. are very convenient.
(3) the utility model device is by adjustment cold junction heat exchange medium temperature and amount, and effective control heat pipe metal pipe-wall temperature, and then the effective corrosion controlling acid dew point, improve the range of choice of boiler oil.
(4) high energy efficiency of heat exchanger makes full use of original fume afterheat.Concrete, in originally flue gas waste heat recovery technology, conventional boiler waste heat flue-gas temperature from 200 degree drop to 160 degree emptying, gas energy utilization rate is 20%.And flue-gas temperature can be dropped to 120 degree by the fume afterheat Utilization plan that the utility model provides, gas energy utilization rate is 40%, more original heat recovery technology, and flue gas utilization rate improves nearly 20%.
(5) the utility model can combinationally use with existing boiler tail heat exchanger.
(6) the utility model device preheated air and hot water can enter people's boiler capacity system balancing, effective raising boiler efficiency 1 ~ 2%.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and example, the utility model is further described.
Fig. 1 is a kind of process chart of the present utility model;
Fig. 2 is another kind of process chart of the present utility model;
In figure, 1 battery limit (BL) carrys out boiler exhaust gas pipeline, 2 high temperature air pipelines, 3 hot water pipings, 4 water bypass valve and pipelines, 5 exhaust steam by-pass lines, 6 softened water pumps and valve, pipeline, 7 water tanks, 8 soft water or solidifying water water-supply line,
9 smoke discharging pipes, 10 cold-air ducts, 11 air transfer valves, 12 low-temperature zone heat exchange of heat pipes, 13 air switch bypass duct, 14 high-temperature section heat exchangers.
Detailed description of the invention
Here will be described exemplary embodiment in detail, its sample table shows in the accompanying drawings.When description below relates to accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawing represents same or analogous key element.Embodiment described in following exemplary embodiment does not represent all embodiments consistent with the utility model.On the contrary, they only with as in appended claims describe in detail, the example of device that aspects more of the present utility model are consistent.
As shown in accompanying drawing 1,2, the novel anti-low-temperature corrosion waste-heat recovery device of a kind of band adjustable boiler of power plant of temperature, comprises air preheater and auxiliary heat-exchanging interchanger.
The air preheater of the present embodiment forms high-temperature section heat exchanger 14; Auxiliary heat-exchanging interchanger forms low-temperature zone heat exchange of heat pipe 12.
The smoke inlet end of high-temperature section heat exchanger 14 connects battery limit (BL) and carrys out boiler exhaust gas pipeline 1, and outlet connects the gas inlet end of low-temperature zone heat exchange of heat pipe 12.Fig. 1,2 difference be exactly that high-temperature section heat exchanger 14 is different.
Low-temperature zone heat exchange of heat pipe 12 adopts three-stage heat exchanger form: higher level's heat exchange end, intermediate heat exchange end, subordinate's heat exchange end.
Subordinate's heat exchange end entrance end is communicated with the offgas outlet of high-temperature section heat exchanger 14; Subordinate's heat exchange end port of export connects smoke discharging pipe 9.
Middle rank heat exchange end is air heat-exchange end, one end of air heat-exchange end is cool air inlet (connecting cooled-air line 10), the other end is hot-blast outlet, hot-blast outlet is connected with the cold air inlet of high-temperature section heat exchanger 14, the two ends of air exchange end are connected with air and switch bypass duct 13 and air transfer valve 11, switch bypass duct 13 and air transfer valve 11 by air, cold air can directly enter into high-temperature section heat exchanger 14 without air exchange end.
Higher level's heat exchange end is water heat-exchange end, the two ends of water heat-exchange end are respectively not for cold water enters end and hot water goes out end, cold water enter end and hot water go out to hold between be communicated with water bypass valve and pipeline 4, by water bypass valve and pipeline 4, soft water or solidifying water can connect hot water piping 3 without water heat-exchange end or directly discharge; Softened water pump 6, water tank 7, soft water or solidifying water water-supply line 8 is connected with the arrival end of water heat-exchange end.Exhaust steam by-pass line 5 is connected with between water tank 7 and water heat-exchange end.
By the air preheater in original technical scheme together with economizer design, and air preheater is decomposed into high temperature section and low-temperature zone heat exchanger.Carry out soft water from battery limit (BL) or solidifying water pipeline 8 enters people's water tank 7, deliver in hot water drum through water pump 6 pressurization and carry out heat exchange with low-temperature zone heat exchange of heat pipe 12 top, after water is heated after hot water piping 3 to battery limit (BL).
Carry out cold air pipeline 10 to enter in the middle part of low-temperature zone heat exchange of heat pipe 12 through switch valve 11 carry out heat exchange from battery limit (BL), enter high-temperature section heat exchanger 14 after more than heating temperatures to 100 DEG C, after heat exchange, high temperature air delivers to boiler battery limit (BL) through high temperature air pipeline 2.
Carry out flue gas to enter and enter the hot side of high-temperature section heat exchanger 14 from battery limit (BL) through boiler exhaust gas pipeline 1, enter low-temperature zone heat exchange of heat pipe 12 after carrying out heat exchange by heat pipe and high temperature section air, carry out the laggard people's smoke discharging pipe 9 of heat exchange again with cold side medium and enter chimney.
Low-temperature zone heat exchange of heat pipe hot water drum has adjustment pipe wall of heat exchange pipe temperature function, utilize heat pipes isothermal property and one-way heat conduction feature, heat pipe heating surface lowermost wall surface temperature only has small gradient temperature drop, utilizes the isothermal of heat pipe to be improved by low-temperature region heat pipe wall temperature.The part exhaust steam that hot water drum produces is gathered to water tank 5 by exhaust steam by-pass line 7.
When steam generator system load or fuel change, switch bypass duct 13 pairs of cold fluids (air, water) adjust by regulating water bypass valve and pipeline 4 or air, protection cryogenic heat exchanger low-temperature region heat pipe, prevents dew point corrosion.
Above-described the utility model embodiment, does not form the restriction to the utility model protection domain.Any do within spirit of the present utility model and principle amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (4)
1. be with the novel anti-low-temperature corrosion waste-heat recovery device of the adjustable boiler of power plant of temperature, it is characterized in that, comprise air preheater and auxiliary heat-exchanging interchanger, air preheater cold air inlet is connected with the hot-blast outlet of secondary unit; The offgas outlet of air preheater is communicated with the gas inlet of secondary unit; Cold air after secondary unit heat exchange enters into heat exchange further in air preheater, and the boiler exhaust gas after air preheater exchanges enters into heat exchange further in secondary unit heat.
2. the novel anti-low-temperature corrosion waste-heat recovery device of the adjustable boiler of power plant of band temperature according to claim 1, is characterized in that, described secondary unit is three-stage heat exchanger.
3. the novel anti-low-temperature corrosion waste-heat recovery device of the adjustable boiler of power plant of band temperature according to claim 2, it is characterized in that, described three-stage heat exchanger is hot-pipe type heat-exchanger, and heat exchanger is vertically arranged: higher level's heat exchange end, intermediate heat exchange end, subordinate's heat exchange end; Subordinate's heat exchange end entrance end is communicated with the offgas outlet of air preheater; Middle rank heat exchange end is air heat-exchange end, and one end of air heat-exchange end is cool air inlet, the other end is hot-blast outlet, and hot-blast outlet is connected with the cold air inlet of air preheater, and the two ends of air exchange end are connected with air and switch bypass duct; Higher level's heat exchange end is water coke slurry end, and the two ends of water coke slurry end are respectively not for cold water enters end and hot water goes out end, cold water enter end and hot water go out to hold between be communicated with water bypass valve and pipeline.
4. the novel anti-low-temperature corrosion waste-heat recovery device of the adjustable boiler of power plant of band temperature according to claim 3, is characterized in that, the arrival end of described water coke slurry end is connected with pump and water tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520441539.0U CN204693475U (en) | 2015-06-25 | 2015-06-25 | The novel anti-low-temperature corrosion waste-heat recovery device of the band adjustable boiler of power plant of temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520441539.0U CN204693475U (en) | 2015-06-25 | 2015-06-25 | The novel anti-low-temperature corrosion waste-heat recovery device of the band adjustable boiler of power plant of temperature |
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| Publication Number | Publication Date |
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| CN204693475U true CN204693475U (en) | 2015-10-07 |
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| CN201520441539.0U Expired - Fee Related CN204693475U (en) | 2015-06-25 | 2015-06-25 | The novel anti-low-temperature corrosion waste-heat recovery device of the band adjustable boiler of power plant of temperature |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403058A (en) * | 2015-10-22 | 2016-03-16 | 山东岱荣节能环保科技有限公司 | Device and process for utilizing waste heat of waste flue gas of hot-blast stove |
| CN106765268A (en) * | 2017-01-19 | 2017-05-31 | 清华大学 | A kind of residual heat from boiler fume depth retracting device |
| CN106765288A (en) * | 2017-03-03 | 2017-05-31 | 山西大学 | A kind of classification heat-exchange system of station boiler rotary regenerative air preheater |
| CN107869727A (en) * | 2016-09-27 | 2018-04-03 | 湖南中集竹木业发展有限公司 | A kind of heat exchanger and heat-exchange method |
-
2015
- 2015-06-25 CN CN201520441539.0U patent/CN204693475U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403058A (en) * | 2015-10-22 | 2016-03-16 | 山东岱荣节能环保科技有限公司 | Device and process for utilizing waste heat of waste flue gas of hot-blast stove |
| CN107869727A (en) * | 2016-09-27 | 2018-04-03 | 湖南中集竹木业发展有限公司 | A kind of heat exchanger and heat-exchange method |
| CN106765268A (en) * | 2017-01-19 | 2017-05-31 | 清华大学 | A kind of residual heat from boiler fume depth retracting device |
| CN106765268B (en) * | 2017-01-19 | 2022-07-26 | 清华大学 | Boiler flue gas waste heat degree of depth recovery unit |
| CN106765288A (en) * | 2017-03-03 | 2017-05-31 | 山西大学 | A kind of classification heat-exchange system of station boiler rotary regenerative air preheater |
| CN106765288B (en) * | 2017-03-03 | 2023-07-18 | 山西大学 | A graded heat exchange system for a rotary air preheater of a utility boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151007 Termination date: 20200625 |