CN206746233U - A kind of waste gas bag-type dust collector of biomass fuel boiler - Google Patents
A kind of waste gas bag-type dust collector of biomass fuel boiler Download PDFInfo
- Publication number
- CN206746233U CN206746233U CN201720408764.3U CN201720408764U CN206746233U CN 206746233 U CN206746233 U CN 206746233U CN 201720408764 U CN201720408764 U CN 201720408764U CN 206746233 U CN206746233 U CN 206746233U
- Authority
- CN
- China
- Prior art keywords
- desulfurizing tower
- waste gas
- dust collector
- type dust
- sack cleaner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000428 dust Substances 0.000 title claims abstract description 39
- 239000002912 waste gas Substances 0.000 title claims abstract description 29
- 239000000446 fuel Substances 0.000 title claims abstract description 23
- 239000002028 Biomass Substances 0.000 title claims abstract description 20
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 39
- 239000007789 gas Substances 0.000 claims abstract description 21
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 239000007921 spray Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000012717 electrostatic precipitator Substances 0.000 claims abstract description 12
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 14
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 abstract description 5
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract description 2
- 239000004744 fabric Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 239000000706 filtrate Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000009941 weaving Methods 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 241000609240 Ambelania acida Species 0.000 description 1
- 241000790917 Dioxys <bee> Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 239000012620 biological material Substances 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000009689 gas atomisation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
Landscapes
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
It the utility model is related to bag-type dust collector technical field, and disclose a kind of waste gas bag-type dust collector of biomass fuel boiler, including desulfurizing tower, baffle plate is installed with the top of the desulfurizing tower inner chamber, exhaust gas inlet pipe is communicated with the outside of the desulfurizing tower, the bottom of the desulfurizing tower inner chamber is provided with slurry pool, the water pump for being internally provided with water inlet and being connected with slurry pool of the slurry pool, the delivery port of the water pump is communicated with shower, the top socket joint of the desulfurizing tower is connected with electrostatic precipitator, the electrostatic precipitator is installed with homogenizing plate with desulfurizing tower junction.The utility model is reasonable in design, efficient energy-saving and safety and environmental protection, desulfurizing tower is set, sulfur dioxide and nitrogen dioxide are effectively purified, avoid sack cleaner purification and do not pollute air thoroughly, spray head is set, atomizing spray is carried out to waste gas, avoids the too high combustible dust blast of dust concentration, it is thus also avoided that the Mars in waste gas burns out filter bag.
Description
Technical field
It the utility model is related to bag-type dust collector technical field, the waste gas cloth bag of specially a kind of biomass fuel boiler
Dust arrester.
Background technology
Biomass fuel refers to using biological material burning as fuel, is typically mainly agriculture and forestry organic waste material such as stalk, saw
End, bagasse and rice chaff etc., the main distinction is in fossil fuel, in current national policy and environmental protection standard, directly burning life
Material belongs to high pollution fuel, is only used in the brick kitchen range in rural area, not in being used in city, the application of biomass fuel,
It is actual mainly to regard agricultural waste as raw material, by the technique such as crushing, mixing, extruding and drying, various be molded such as is made
Block or graininess etc., a kind of Novel clean-fuel that can directly burn, sack cleaner is a kind of dry dust removal apparatus, and it is suitable
For trapping tiny and drying non-fiber dust, filter bag is using the filter cloth or nonwoven felt of weaving into being knitted using fiber
The filtration of thing is filtered to dusty gas, and when dusty gas enters sack cleaner, particle is big or heavy dust,
Because the effect of gravity settles down, fall into ash bucket, the gas containing relatively fine dust when passing through filtrate, dust by detention,
Gas is purified, harmful gas such as substantial amounts of sulfur dioxide and nitrogen dioxide is had in biomass fuel combustion, it is single
Pure sack cleaner can not effectively be purified to sulfur dioxide and nitrogen dioxide, with cloth bag handle boiler waste gas it is also possible to
Cloth bag is burnt, the effect of dedusting is also undesirable.
Utility model content
（One）The technical problem of solution
In view of the shortcomings of the prior art, the utility model provides a kind of waste gas bag-type dust dress of biomass fuel boiler
Put, possess the advantages that wet type desulfurizing, good dedusting effect, solving simple sack cleaner can not be to sulfur dioxide and titanium dioxide
The problem of nitrogen is effectively purified, and boiler waste gas is handled it is also possible to cloth bag is burnt with cloth bag, and the effect of dedusting is also undesirable.
（Two）Technical scheme
To realize above-mentioned wet type desulfurizing, the purpose of good dedusting effect, the utility model provides following technical scheme：One kind is raw
The waste gas bag-type dust collector of biomass fuel boiler, including desulfurizing tower, baffle plate is installed with the top of the desulfurizing tower inner chamber,
Exhaust gas inlet pipe is communicated with the outside of the desulfurizing tower, the bottom of the desulfurizing tower inner chamber is provided with slurry pool, the slurry pool
The water pump for being internally provided with water inlet and being connected with slurry pool, the delivery port of the water pump is communicated with shower, the desulfurizing tower
Top socket joint be connected with electrostatic precipitator, the electrostatic precipitator is installed with homogenizing plate with desulfurizing tower junction, described
One end of shower is through homogenizing plate and extends in electrostatic precipitator, and one end of the shower is communicated with spray head, described
The side of desulfurizing tower is installed with air by being communicated with sack cleaner communicating pipe at the top of the sack cleaner inner chamber
Compressor, the gas outlet of the air compressor is communicated with the dedusting skeleton being installed with sack cleaner, described
The surface of dedusting skeleton is socketed with filter bag, and the bottom of the sack cleaner is fixedly connected with ash bucket, and the bottom of the ash bucket is consolidated
Dingan County is equipped with discharger, and the both sides of the sack cleaner are installed with supporting leg, and the sack cleaner is away from communicating pipe
Side be installed with wind sucting chamber, the inside of the wind sucting chamber is installed with air blower, and the air entry of the air blower is consolidated
Dingan County is equipped with the air intake duct on air blower, and the air intake duct runs through and extended in sack cleaner, the air blower
Exhaust outlet is installed with the blast pipe on air blower, and the blast pipe runs through and extended to outside wind sucting chamber.
Preferably, the homogenizing plate includes rotating shaft, the surface of rotating shaft be respectively sleeved on the first supporting plate, the second supporting plate and
3rd supporting plate, the surface of the first supporting plate, the second supporting plate and the 3rd supporting plate is interleaved to be provided with equal discharge orifice.
Preferably, insertion desulfurizing tower and the drainpipe extended in slurry pool are installed with the outside of the desulfurizing tower,
Threaded one end of the drainpipe away from desulfurizing tower is connected with draining valve.
Preferably, the quantity of the spray head is no less than two.
Preferably, the air compressor is pulsed air compressor.
Preferably, the quantity of the filter bag is no less than three.
（Three）Beneficial effect
Compared with prior art, the utility model provides a kind of waste gas bag-type dust collector of biomass fuel boiler,
Possesses following beneficial effect：
1st, the waste gas bag-type dust collector of the biomass fuel boiler, by setting desulfurizing tower, to sulfur dioxide and dioxy
Change nitrogen effectively to be purified, avoid sack cleaner purification and do not pollute air thoroughly, spray head is set, waste gas is atomized
Spray, avoid the too high combustible dust blast of dust concentration, it is thus also avoided that the Mars in waste gas burns out cloth bag.
2nd, the waste gas bag-type dust collector of the biomass fuel boiler, by setting homogenizing plate, to the Distribution Pattern of waste gas
Meet the requirements, can maximize reduce wind resistance, set filter bag, filter bag using weaving filter cloth or nonwoven felt into,
Dusty gas is filtered using the filtration of fabric, when dusty gas enters sack cleaner, particle is big or compares
Great dust, because the effect of gravity settles down, fall into ash bucket, the gas containing relatively fine dust when passing through filtrate,
Dust is purified gas by detention.
Brief description of the drawings
Fig. 1 is the utility model structure diagram；
Fig. 2 is the utility model homogenizing plate structural representation.
In figure：1 desulfurizing tower, 2 baffle plates, 3 slurry pools, 4 water pumps, 5 showers, 6 exhaust gas inlet pipes, 7 homogenizing plates, 71 first
Fagging, 72 second supporting plates, 73 the 3rd supporting plates, 74 equal discharge orifices, 75 rotating shafts, 8 electrostatic precipitator, 9 spray heads, 10 drainpipes,
11 draining valves, 12 communicating pipes, 13 sack cleaners, 14 air compressors, 15 dedusting skeletons, 16 filter bags, 17 ash buckets, 18 dischargings
Device, 19 supporting legs, 20 wind sucting chamber, 21 air blowers, 22 blast pipes, 23 air intake ducts.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Fig. 1-2, a kind of waste gas bag-type dust collector of biomass fuel boiler, including desulfurizing tower 1 are referred to, desulfurization is set
Tower 1, sulfur dioxide and nitrogen dioxide are effectively purified, avoid sack cleaner 13 and purify and do not pollute air thoroughly, taken off
The outside of sulphur tower 1 is installed with insertion desulfurizing tower 1 and the drainpipe 10 extended in slurry pool 3, and drainpipe 10 is away from desulfurization
The threaded one end of tower 1 is connected with draining valve 11, and baffle plate 2 is installed with the top of the inner chamber of desulfurizing tower 1, and the outside of desulfurizing tower 1 connects
Exhaust gas inlet pipe 6 is connected with, the bottom of the inner chamber of desulfurizing tower 1 is provided with slurry pool 3, and slurry pool 3 is internally provided with water inlet and slurry
The water pump 4 that liquid pool 3 connects, the delivery port of water pump 4 are communicated with shower 5, and the top socket joint of desulfurizing tower 1 is connected with electrostatic precipitator
8, electrostatic precipitator 8 is installed with homogenizing plate 7 with the junction of desulfurizing tower 1, and homogenizing plate 7 includes rotating shaft 75, the surface of rotating shaft 75
It is respectively sleeved on the first supporting plate 71, the second supporting plate 72 and the 3rd supporting plate 73, the first supporting plate 71, the and of the second supporting plate 72
The surface of 3rd supporting plate 73 is interleaved to be provided with equal discharge orifice 74, sets homogenizing plate 7, the Distribution Pattern of waste gas is met the requirements,
The resistance for reducing wind can be maximized, one end of shower 5 through homogenizing plate 7 and is extended in electrostatic precipitator 8, shower 5
One end be communicated with spray head 9, the quantity of spray head 9 is no less than two, sets spray head 9, carries out atomizing spray to waste gas, keeps away
The too high combustible dust blast of dust concentration is exempted from, it is thus also avoided that the Mars in waste gas burns out filter bag 16, and the side of desulfurizing tower 1 passes through
It is communicated with sack cleaner 13 communicating pipe 12, sack cleaner 13 is installed with air compressor 14, air at the top of inner chamber
Compressor 14 is pulsed air compressor 14, and the gas outlet of air compressor 14, which is communicated with, to be installed with positioned at bag-type dust
Dedusting skeleton 15 on device 13, the surface of dedusting skeleton 15 are socketed with filter bag 16, and the quantity of filter bag 16 is no less than three, sets filter
Bag 16, filter bag 16 is using the filter cloth or nonwoven felt of weaving into being entered using the filtration of fabric to dusty gas
Row filtering, when dusty gas enters sack cleaner 13, particle is big or heavy dust, because the effect of gravity settles down
, ash bucket 17 is fallen into, for the gas containing relatively fine dust when passing through filtrate, dust is purified gas, cloth bag removes by detention
The bottom of dirt device 13 is fixedly connected with ash bucket 17, and the bottom of ash bucket 17 is installed with discharger 18, and the two of sack cleaner 13
Side is installed with supporting leg 19, and side of the sack cleaner 13 away from communicating pipe 12 is installed with wind sucting chamber 20, wind sucting chamber
20 inside is installed with air blower 21, and the air entry of air blower 21 is installed with the air intake duct on air blower 21
23, air intake duct 23 runs through and extended in sack cleaner 13, and the exhaust outlet of air blower 21 is installed with positioned at air blower 21
On blast pipe 22, blast pipe 22 runs through and extends to outside wind sucting chamber 20.
The electric elements occurred in this article electrically connect with the main controller and 220V civil powers in the external world, and main controller can be meter
Calculation machine etc. plays the conventionally known equipment of control.
In summary, the waste gas bag-type dust collector of the biomass fuel boiler, desulfurizing tower 1 is set, to sulfur dioxide and
Nitrogen dioxide is effectively purified, and is avoided sack cleaner 13 and is purified and does not pollute air thoroughly, spray head 9 is set, to waste gas
Atomizing spray is carried out, avoids the too high combustible dust blast of dust concentration, it is thus also avoided that the Mars in waste gas burns out filter bag 16, should
Utility model is reasonable in design, efficient energy-saving, simple to operate and safety and environmental protection.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply and deposited between these entities or operation
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability includes, so that process, method, article or equipment including a series of elements not only will including those
Element, but also the other element including being not expressly set out, or it is this process, method, article or equipment also to include
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Other identical element also be present in process, method, article or equipment including the key element.
While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art,
It is appreciated that these embodiments can be carried out with a variety of changes in the case where not departing from principle of the present utility model and spirit, repaiied
Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.
Claims (6)
1. a kind of waste gas bag-type dust collector of biomass fuel boiler, including desulfurizing tower（1）, it is characterised in that：The desulfurization
Tower（1）Baffle plate is installed with the top of inner chamber（2）, the desulfurizing tower（1）Outside be communicated with exhaust gas inlet pipe（6）, it is described
Desulfurizing tower（1）The bottom of inner chamber is provided with slurry pool（3）, the slurry pool（3）Be internally provided with water inlet and slurry pool（3）
The water pump of connection（4）, the water pump（4）Delivery port be communicated with shower（5）, the desulfurizing tower（1）The connection of top socket joint
There is electrostatic precipitator（8）, the electrostatic precipitator（8）With desulfurizing tower（1）Junction is installed with homogenizing plate（7）, the spray
Shower pipe（5）One end run through homogenizing plate（7）And extend to electrostatic precipitator（8）It is interior, the shower（5）One end be communicated with spray
Drench head（9）, the desulfurizing tower（1）Side pass through communicating pipe（12）It is communicated with sack cleaner（13）, the sack cleaner
（13）Air compressor is installed with the top of inner chamber（14）, the air compressor（14）Gas outlet be communicated with fixed peace
Equipped with positioned at sack cleaner（13）On dedusting skeleton（15）, the dedusting skeleton（15）Surface be socketed with filter bag（16）,
The sack cleaner（13）Bottom be fixedly connected with ash bucket（17）, the ash bucket（17）Bottom be installed with discharger
（18）, the sack cleaner（13）Both sides be installed with supporting leg（19）, the sack cleaner（13）Away from connection
Pipe（12）Side be installed with wind sucting chamber（20）, the wind sucting chamber（20）Inside be installed with air blower（21）, institute
State air blower（21）Air entry be installed with positioned at air blower（21）On air intake duct（23）, the air intake duct（23）Run through
And extend to sack cleaner（13）It is interior, the air blower（21）Exhaust outlet be installed with positioned at air blower（21）On row
Tracheae（22）, the blast pipe（22）Run through and extend to wind sucting chamber（20）Outside.
A kind of 2. waste gas bag-type dust collector of biomass fuel boiler according to claim 1, it is characterised in that：It is described
Homogenizing plate（7）Including rotating shaft（75）, rotating shaft（75）Surface be respectively sleeved on the first supporting plate（71）, the second supporting plate（72）With
3rd supporting plate（73）, the first supporting plate（71）, the second supporting plate（72）With the 3rd supporting plate（73）Surface staggeredly open up
There is equal discharge orifice（74）.
A kind of 3. waste gas bag-type dust collector of biomass fuel boiler according to claim 1, it is characterised in that：It is described
Desulfurizing tower（1）Outside be installed with insertion desulfurizing tower（1）And extend to slurry pool（3）Interior drainpipe（10）, drainpipe
（10）Away from desulfurizing tower（1）Threaded one end be connected with draining valve（11）.
A kind of 4. waste gas bag-type dust collector of biomass fuel boiler according to claim 1, it is characterised in that：It is described
Spray head（9）Quantity be no less than two.
A kind of 5. waste gas bag-type dust collector of biomass fuel boiler according to claim 1, it is characterised in that：It is described
Air compressor（14）For pulsed air compressor（14）.
A kind of 6. waste gas bag-type dust collector of biomass fuel boiler according to claim 1, it is characterised in that：It is described
Filter bag（16）Quantity be no less than three.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720408764.3U CN206746233U (en) | 2017-04-19 | 2017-04-19 | A kind of waste gas bag-type dust collector of biomass fuel boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720408764.3U CN206746233U (en) | 2017-04-19 | 2017-04-19 | A kind of waste gas bag-type dust collector of biomass fuel boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206746233U true CN206746233U (en) | 2017-12-15 |
Family
ID=60613059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720408764.3U Expired - Fee Related CN206746233U (en) | 2017-04-19 | 2017-04-19 | A kind of waste gas bag-type dust collector of biomass fuel boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206746233U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107899314A (en) * | 2017-12-27 | 2018-04-13 | 肇庆乐华陶瓷洁具有限公司 | A kind of spray tower denitration desulfurization dust-removal system |
| CN108981169A (en) * | 2018-06-08 | 2018-12-11 | 芜湖秀成机械科技有限公司 | A kind of device for reducing dust of biomass thermal wind furnace |
| CN108970307A (en) * | 2018-07-03 | 2018-12-11 | 安徽辰宇机械科技有限公司 | A kind of crop dryer air outlet automatic dust removing apparatus |
| CN109939524A (en) * | 2019-03-28 | 2019-06-28 | 赵澄 | A kind of cleaner for workshop |
| CN112044221A (en) * | 2020-09-29 | 2020-12-08 | 杭州富阳同达金属制品有限公司 | Dust removal and purification device and purification method for metal processing, polishing and grinding workshop |
-
2017
- 2017-04-19 CN CN201720408764.3U patent/CN206746233U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107899314A (en) * | 2017-12-27 | 2018-04-13 | 肇庆乐华陶瓷洁具有限公司 | A kind of spray tower denitration desulfurization dust-removal system |
| CN108981169A (en) * | 2018-06-08 | 2018-12-11 | 芜湖秀成机械科技有限公司 | A kind of device for reducing dust of biomass thermal wind furnace |
| CN108970307A (en) * | 2018-07-03 | 2018-12-11 | 安徽辰宇机械科技有限公司 | A kind of crop dryer air outlet automatic dust removing apparatus |
| CN109939524A (en) * | 2019-03-28 | 2019-06-28 | 赵澄 | A kind of cleaner for workshop |
| CN109939524B (en) * | 2019-03-28 | 2021-07-09 | 赵澄 | A dust collecting equipment for factory building |
| CN112044221A (en) * | 2020-09-29 | 2020-12-08 | 杭州富阳同达金属制品有限公司 | Dust removal and purification device and purification method for metal processing, polishing and grinding workshop |
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| GR01 | Patent grant | ||
| 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: 20171215 |