CN108426258A - Soot blower for boiler hearth - Google Patents
Soot blower for boiler hearth Download PDFInfo
- Publication number
- CN108426258A CN108426258A CN201810325959.0A CN201810325959A CN108426258A CN 108426258 A CN108426258 A CN 108426258A CN 201810325959 A CN201810325959 A CN 201810325959A CN 108426258 A CN108426258 A CN 108426258A
- Authority
- CN
- China
- Prior art keywords
- valve
- soot blower
- helix tube
- limit switch
- nozzle
- 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.)
- Withdrawn
Links
- 239000004071 soot Substances 0.000 title claims abstract description 55
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 230000009467 reduction Effects 0.000 claims abstract description 12
- 239000000945 filler Substances 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 abstract description 9
- 238000010926 purge Methods 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 9
- 238000007664 blowing Methods 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000013517 stratification Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000001464 adherent effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2700/00—Ash removal, handling and treatment means; Ash and slag handling in pulverulent fuel furnaces; Ash removal means for incinerators
- F23J2700/001—Ash removal, handling and treatment means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Incineration Of Waste (AREA)
Abstract
The present invention provides a kind of soot blower for boiler hearth, including rack, nozzle, half tooth helix tube, stuffing box, front limit switch, rear limit switch, motor, gear reduction box, terminal board, wall case, valve-opening mechanism and soot blower valve, soot blower valve, motor, gear reduction box are respectively fixed on the machine frame, motor is connect by gear reduction box with sprocket wheel, sprocket wheel is connect with the spigot nut of half tooth helix tube by chain, it is set with inner tube in half tooth helix tube, stuffing box is cased with outside the smooth bar part of half tooth helix tube；Front limit switch, rear limit switch and motor are respectively connected to terminal board, the reciprocating motion for controlling half tooth helix tube and purging rotary motion；Soot blower valve includes valve rod, and the movement of valve-opening mechanism driving stem opens or closes soot blower valve.The present invention can drive 360 ° of rotations of nozzle by moving radially for helix tube, can increase the compressed air area coverage that nozzle ejects, protect furnace wall cooling to a greater degree.
Description
Technical field
The present invention relates to boiler of power plant technical fields, more specifically, are related to a kind of soot blower for boiler hearth.
Background technology
China has carried out more stringent thermal power plant's pollutant emission standard, the newly-built coal-burning power plant of key area at this stage
The discharge standard of NOx is reduced to 50mg/Nm3, and coal unit has generally carried out low NO transformation, this has resulted in burner hearth water
Anoxycausis at cold wall forms strong reducing property atmosphere.Pyrite in coal is easily converted into corrosivity pole in combustion
Strong hydrogen sulfide gas, and because water-cooling wall pipeline wall surface temperature is higher, greatly accelerate the process of high temperature corrosion.By to water
The situation of cooling wall high-temperature corrosion is studied it can be found that pipeline weakened region is often dust stratification critical regions again, and dust stratification will add
The rate of fast high temperature corrosion, there are corrosion rates when dust stratification to be up to 2.0-2.5mm/a.When water-cooling wall pipeline is because of corrosion thinning to one
" booster " accident when determining degree, is will result in, economic benefit and the safe operation of power plant are seriously affected.
In recent years it has been proposed that the measure of many pre- high temperature corrosion resistances, but it is ineffective, there is following aspects to ask
Topic：Adherent wind is added in trepanning at water-cooling wall, and inleakage is big, seriously affects the normal combustion inside burner hearth, leads to excess air system
Number rises, and NOx discharge increases；Inhibit to corrode by the way of the wind of side, air quantity dynamic pressure is relatively low, can not effectively change adherent place
Atmosphere constituent；In addition control can not realize intelligent automaticization, need operations staff oneself to judge and adjust high temperature corrosion prevent
Locking system increases power plant's employee work amount and is susceptible to human error.
Invention content
In view of the above problems, the object of the present invention is to provide a kind of soot blower for boiler hearth, signified to solve above-mentioned background technology
The problem of going out.
Soot blower for boiler hearth provided by the invention, including：Rack, nozzle, half tooth helix tube, stuffing box, front limit switch, after
Limit switch, motor, gear reduction box, terminal board, wall case, valve-opening mechanism and soot blower valve, wherein the tail end of rack has
Fixed plate, soot blower valve are fixed in fixed plate, and motor, gear reduction box are respectively fixed on the machine frame；Envelope wall case passes through
Furnace wall, nozzle stretch out envelope wall case and enter furnace wall or be contracted in envelope wall case, and nozzle is mounted on the end of thread of half tooth helix tube
Portion opens up there are two opposite Venturi nozzle on nozzle, inner tube, one end of inner tube and spray is set in half tooth helix tube
Head connection, the other end are fixed in fixed plate, and stuffing box is cased with outside the smooth bar part of half tooth helix tube；Motor is subtracted by gear
Fast case is connect with sprocket wheel, and sprocket wheel is connect with the spigot nut of half tooth helix tube by chain；Front limit switch and rear limit switch
It is separately mounted in rack, and positioned at the both ends of half tooth helix tube, front limit switch and rear limit switch are connect by power cord
Enter terminal board, motor accesses terminal board also by power cord；Soot blower valve includes valve rod, and valve-opening mechanism driving stem moves,
Open or close soot blower valve.
Furthermore it is preferred that structure be that soot blower valve further includes valve body, flap and filler seat, filler seat is mounted on valve body
Interior, there are one through-holes for the bottom end tool of filler seat, and through-hole is stretched out in the bottom end of valve rod, and is fixedly connected with flap, on the top of valve rod
It is arranged with spring capping；Follower is installed on the top of filler seat, stuffing nut is installed on follower, in stuffing nut
Spring is installed between spring capping.
Additionally, it is preferred that structure be that valve-opening mechanism includes cam disc and lever, cam disc is sleeved on stuffing box, lever
One end be located on the movement locus of cam disc, the other end of lever and the top of valve rod are hinged.
Furthermore it is preferred that structure be that air valve is installed on valve body.
Additionally, it is preferred that structure be to be lined with gasket between filler seat and valve body.
Furthermore preferred structure is, catch is pasted in the one side that spring capping is contacted with spring.
Using the soot blower for boiler hearth of aforementioned present invention, following technique effect can be obtained：
（1）The present invention does not increase water-cooling wall trepanning, does not add extras, since furnace heating surface soot blowing is intermittently operated,
Soot blowing gap carries out blast injection, and stable, high intensity oxidizing atmosphere is formed in water cooling wall surface, slows down high temperature corruption
Rate is lost, protects furnace wall cooling, equipment is simple, of low cost；
（2）Moving radially for helix tube can drive 360 ° of rotations of nozzle, can increase the compressed air covering that nozzle ejects
Area protects furnace wall cooling to a greater degree；
（3）When high temperature corrosion is not serious, nozzle is movable in wall case, to protect nozzle to be washed away from high-temperature flue gas
Abrasion；
（4）The soot blower for boiler hearth is controlled by automatic control system, is not necessarily to any participation of power plant operations staff, is reduced workload,
Realize Intelligent Prevention water wall high temperature corrosion；
（5）The air valve installed on soot blower valve can prevent blowing medium flows through in flue gas intrusion soot blower for boiler hearth zero
Part.
Description of the drawings
By reference to the explanation below in conjunction with attached drawing, and with a fuller understanding of the present invention, of the invention is other
Purpose and result will be more clearly understood and understood.In the accompanying drawings：
Fig. 1 is the overall structure diagram according to the soot blower for boiler hearth of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram according to the soot blower valve of the embodiment of the present invention；
Fig. 3 is the process schematic according to the valve-opening mechanism of the embodiment of the present invention.
Reference numeral therein includes：Rack 1, nozzle 2, Venturi nozzle 2-1, half tooth helix tube 3, is filled out fixed plate 1-1
Magazine 4, front limit switch 5, rear limit switch 6, motor 7, gear reduction box 8, terminal board 9, envelope wall case 10, cam disc 11-
1, lever 11-2, soot blower valve 12, valve rod 12-1, valve body 12-2, flap 12-3, filler seat 12-4, spring capping 12-5, gear
Piece 12-5-1, follower 12-6, stuffing nut 12-7, spring 12-8, gasket 12-9, inner tube 13, air valve 14.
Specific implementation mode
In the following description, for purposes of illustration, it in order to provide the comprehensive understanding to one or more embodiments, explains
Many details are stated.It may be evident, however, that these embodiments can also be realized without these specific details.
In other examples, one or more embodiments for ease of description, well known structure and equipment are shown in block form an.
Fig. 1-Fig. 3 shows the overall structure of soot blower for boiler hearth according to the ... of the embodiment of the present invention, the structure of soot blower valve
With the structure of valve-opening mechanism.
Fig. 3 simplifies the structure of soot blower valve to highlight the relationship between valve-opening mechanism and soot blower valve.
As Fig. 1-Fig. 3 jointly shown in, soot blower for boiler hearth provided in an embodiment of the present invention includes：Rack 1, nozzle 2, venturi
Nozzle 2-1, half tooth helix tube 3, stuffing box 4, front limit switch 5, rear limit switch 6, motor 7, gear reduction box 8, terminal board
9, envelope wall case 10, valve-opening mechanism and soot blower valve 12, wherein the tail end of rack 1 has fixed plate 1-1, soot blower valve
12 are fixed on fixed plate 1-1, and motor 7, gear reduction box 8 are separately fixed in rack 1；Envelope wall case 10 passes through the stove of burner hearth
Wall,
Nozzle 2 is telescopic to be mounted in envelope wall case 10, i.e., nozzle 2 stretches out envelope wall case 10 and enters burner hearth or be contracted in sealing
In wall case 10, the position that envelope wall case 10 is used to enter for nozzle 2 burner hearth provides sealing, and nozzle 2 is mounted on half tooth helix tube 3
Thread head is opened up on nozzle 2 there are two opposite Venturi nozzle 2-1, and it is heated that Venturi nozzle 2-1 can tiltedly blow wall
Face, when soot blower deactivates, nozzle 2 is protected in envelope wall case 10.
Inner tube 13 is set in half tooth helix tube 3, one end of inner tube 13 is connected to nozzle 2, and the other end of inner tube 13 is solid
It is scheduled on fixed plate 1-1, stuffing box 4 is cased with outside the smooth bar part of half tooth helix tube 3, stuffing box 4 is for closing half tooth spiral
Annular space between pipe 3 and inner tube 13, avoids blowing medium from leaking.
Motor 7 is connect by gear reduction box 8 with sprocket wheel, and the spigot nut of sprocket wheel and half tooth helix tube 3 is connected by chain
It connects, is driven with movable sprocket by motor 7, spigot nut is made to rotate, to force half tooth helix tube 3 to generate axial movement.
Front limit switch 5 and rear limit switch 6 are separately mounted in rack 1, and front limit switch 5 is located at half tooth helix tube
3 front end, rear limit switch 6 are located at the rear end of half tooth helix tube 3, and front limit switch 5 and rear limit switch 6 pass through power cord
Terminal board 9 is accessed, motor 7 accesses terminal board 9 also by power cord；Front limit switch 5 and rear limit switch 6 are for controlling half tooth
The reciprocating motion of helix tube 3 and purging rotary motion.
Soot blower valve 12 includes valve rod 12-1, valve body 12-2, flap 12-3, filler seat 12-4, spring capping 12-5, fills out
Material lid 12-6, stuffing nut 12-7 and spring 12-8, filler seat 12-4 are mounted in valve body 12-2, in filler seat 12-4 and valve body
It is lined with gasket 12-9 between 12-1, there are one through-hole, through-hole is stretched out in the bottom end of valve rod 12-1 for the bottom end tool of filler seat 12-4, and with
Flap 12-3 is fixedly connected, and follower 12-6 is mounted on the top of filler seat 12-4, and stuffing nut 12-7 is mounted on follower 12-
On 6, spring capping 12-5 is set in the top of valve rod, spring 12-8 be mounted on stuffing nut 12-7 and spring capping 12-5 it
Between, when valve rod 12-1 stress moves down, flap 12-3 is driven to move down, opens the through-hole of the bottom ends filler seat 12-4, i.e.,
Soot blower valve 12 is opened, at this point, spring 12-8 compression accumulation of energys, when spring capping 12-5 and stuffing nut 12-7 are contacted, valve
Valve 12-3 can not continue to move down, when valve rod 12-1 no longer by downward pressure when, spring 12-8, which is released, to rebound, band ovable valve stem
12-1 is moved up, and when flap 12-3 covers the through-hole of the bottom ends filler seat 12-4, closes soot blower valve 12.
Catch 12-5-1, catch 12-5-1 and spring are pasted in the one side that spring capping 12-5 is contacted with spring 12-8
12-8 is contacted, and plays the role of preventing abrasion spring capping 12-5.
Corrosive fume invades nozzle 2 in order to prevent, air valve 14 is equipped on valve body 12-1, air valve 14 is in burner hearth
Soot blower is opened when deactivating, thus cleaned air enters in soot blower for boiler hearth, once soot blower for boiler hearth valve is opened, into valve body
Air valve 14 is closed in the pressure effect of the blowing medium of 12-1.
If the flue gas pressures of soot blower for boiler hearth installation site are not achieved defined negative pressure, air valve 14 can connect sealing with
Ventilating air pipeline, in this way, can prevent flue gas from invading the part that flows through of blowing medium in soot blower for boiler hearth, such as nozzle 2, interior
Pipe 13 and soot blower valve 12.
Valve-opening mechanism includes cam disc 11-1 and lever 11-2, and cam disc 11-1 is sleeved on stuffing box 4, lever 11-2's
One end is located on the movement locus of cam disc 11-1, and the other end of lever 11-2 is hinged with the top of valve rod 12-1, works as cam disc
When 11-1 drives lever 11-2 to swing, lever 11-2 bands ovable valve stem 12-1 is moved up and down.
Soot blower valve 12 is opened by the rotary motion of half tooth helix tube 3, and cam disc 11-1 is mounted on stuffing box 4,
After half tooth helix tube, 3 forward stroke, cam disc 11-1 starts to control valve rod 12-1, when purging beginning, under lever 11-2
Pressure valve valve 12-3 opens soot blower valve 12, and being finished in purging is, cam disc 11-1 trip lever 11-2 again close soot blowing
Device valve 12.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. a kind of soot blower for boiler hearth, which is characterized in that including：Rack, nozzle, half tooth helix tube, stuffing box, front limit switch,
Rear limit switch, motor, gear reduction box, terminal board, wall case, valve-opening mechanism and soot blower valve, wherein
There is the tail end of the rack fixed plate, the soot blower valve to be fixed in the fixed plate, the motor, the tooth
Wheel reduction box is separately fixed in the rack；
The envelope wall case passes through furnace wall, the nozzle to stretch out the envelope wall case and enter the furnace wall or be contracted in the sealing
In wall case, the nozzle is mounted on the thread head of the half tooth helix tube, is opened up on the nozzle there are two opposite text
Nozzle in mound is set with inner tube in the half tooth helix tube, and one end of said inner tube is connected to the nozzle, and the other end is fixed
In the fixed plate, stuffing box is cased with outside the smooth bar part of the half tooth helix tube；
The motor is connect by the gear reduction box with sprocket wheel, and the spigot nut of the sprocket wheel and the half tooth helix tube is logical
Cross chain connection；
The front limit switch and the rear limit switch are separately mounted in the rack, and positioned at the half tooth helix tube
Both ends, the front limit switch and the rear limit switch access the terminal board by power cord, the motor also by
Power cord accesses the terminal board；
The soot blower valve includes valve rod, and the valve-opening mechanism drives the stem movement, opens or closes the soot blower
Valve.
2. soot blower for boiler hearth as described in claim 1, which is characterized in that the soot blower valve further include valve body, flap and
Filler seat, the filler seat are mounted in the valve body, and there are one through-hole, the bottom ends of the valve rod for the bottom end tool of the filler seat
The through-hole is stretched out, and is fixedly connected with the flap, spring capping is arranged on the top of the valve rod；In the filler seat
Top follower is installed, stuffing nut is installed on the follower, in the stuffing nut and the spring capping
Between spring is installed.
3. soot blower for boiler hearth as claimed in claim 2, which is characterized in that the valve-opening mechanism includes cam disc and lever, institute
It states cam disc to be sleeved on the stuffing box, one end of the lever is located on the movement locus of the cam disc, the lever
The other end and the valve rod top it is hinged.
4. soot blower for boiler hearth as claimed in claim 2, which is characterized in that be equipped with air valve on the valve body.
5. soot blower for boiler hearth as claimed in claim 2, which is characterized in that be lined between the filler seat and the valve body
Piece.
6. soot blower for boiler hearth as claimed in claim 2, which is characterized in that one contacted with the spring in the spring capping
Catch is pasted on face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810325959.0A CN108426258A (en) | 2018-04-12 | 2018-04-12 | Soot blower for boiler hearth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810325959.0A CN108426258A (en) | 2018-04-12 | 2018-04-12 | Soot blower for boiler hearth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108426258A true CN108426258A (en) | 2018-08-21 |
Family
ID=63160751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810325959.0A Withdrawn CN108426258A (en) | 2018-04-12 | 2018-04-12 | Soot blower for boiler hearth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108426258A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503553A (en) * | 2020-12-10 | 2021-03-16 | 国家能源集团泰州发电有限公司 | Soot blower for reducing high-temperature corrosion of water-cooled wall and working method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201836906U (en) * | 2010-09-17 | 2011-05-18 | 江苏绿叶锅炉有限公司 | Soot blower for boiler hearth |
| CN103672925A (en) * | 2012-09-10 | 2014-03-26 | 湖北华信机械发展有限公司 | Hearth soot blower |
| CN205155990U (en) * | 2015-11-09 | 2016-04-13 | 湖北金山电力设备有限公司 | Negative pressure boiler hearth short telescopic soot blower |
| CN106940021A (en) * | 2017-05-08 | 2017-07-11 | 江苏方天电力技术有限公司 | A kind of sootblower arrangement |
| CN208312412U (en) * | 2018-04-12 | 2019-01-01 | 吉林省光大节能技术有限责任公司 | Soot blower for boiler hearth |
-
2018
- 2018-04-12 CN CN201810325959.0A patent/CN108426258A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201836906U (en) * | 2010-09-17 | 2011-05-18 | 江苏绿叶锅炉有限公司 | Soot blower for boiler hearth |
| CN103672925A (en) * | 2012-09-10 | 2014-03-26 | 湖北华信机械发展有限公司 | Hearth soot blower |
| CN205155990U (en) * | 2015-11-09 | 2016-04-13 | 湖北金山电力设备有限公司 | Negative pressure boiler hearth short telescopic soot blower |
| CN106940021A (en) * | 2017-05-08 | 2017-07-11 | 江苏方天电力技术有限公司 | A kind of sootblower arrangement |
| CN208312412U (en) * | 2018-04-12 | 2019-01-01 | 吉林省光大节能技术有限责任公司 | Soot blower for boiler hearth |
Non-Patent Citations (2)
| Title |
|---|
| 郑勇斗;张慧峰;杨秉琳;: "燃煤锅炉吹灰器控制系统", 自动化技术与应用, no. 09, pages 1 - 3 * |
| 韩忠国;吴文杰;: "V04型炉膛吹灰器缺陷分析及措施", 电力技术, no. 3, pages 51 - 54 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503553A (en) * | 2020-12-10 | 2021-03-16 | 国家能源集团泰州发电有限公司 | Soot blower for reducing high-temperature corrosion of water-cooled wall and working method thereof |
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| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180821 |