CN107366895B - Method for rapidly replacing safety valve of drum of dry quenching boiler - Google Patents
Method for rapidly replacing safety valve of drum of dry quenching boiler Download PDFInfo
- Publication number
- CN107366895B CN107366895B CN201610312015.0A CN201610312015A CN107366895B CN 107366895 B CN107366895 B CN 107366895B CN 201610312015 A CN201610312015 A CN 201610312015A CN 107366895 B CN107366895 B CN 107366895B
- Authority
- CN
- China
- Prior art keywords
- boiler
- coke
- dry
- quenching
- valve
- 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.)
- Active
Links
- 238000010791 quenching Methods 0.000 title claims abstract description 59
- 230000000171 quenching effect Effects 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000571 coke Substances 0.000 claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 230000000740 bleeding effect Effects 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010410 dusting Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000004939 coking Methods 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
- F22B37/44—Applications, arrangements, or dispositions of alarm or automatic safety devices of safety valves
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/02—Dry cooling outside the oven
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Coke Industry (AREA)
Abstract
The invention relates to a method for quickly replacing a coke dry quenching boiler drum safety valve, which is characterized in that nitrogen is introduced into gas pipelines of a coke dry quenching furnace and a boiler, cold water is cooled by adopting a water jacket operation mode, and cold air enters from a boiler manhole and is discharged from a coke dry quenching furnace port by utilizing gas buoyancy, so that the temperature of the coke dry quenching boiler is quickly reduced, and the quick replacement of the boiler drum safety valve is finally realized; compared with the prior art, the invention has the beneficial effects that: 1) the invention can shorten the time for the boiler drum to reach the condition of replacing the safety valve and reach the condition required by replacing the boiler drum safety valve within 8 hours. 2) The invention can reduce the accident handling time and reduce the production loss.
Description
Technical field
The present invention relates to coking technology field more particularly to a kind of sides of quick-replaceable coke dry quenching boiler drum safety valve
Method.
Background technique
Coke dry quenching boiler drum pressure is more than after providing allowed band, and boiler drum safety valve jumping up releases stress, and is guaranteed
Boiler drum safe and stable operation.
But due to not falling after rise etc. boiler drum safety valve, safety valve body is caused to damage.Due to boiler drum safety valve
To be welded to connect, argon arc welding mode is used when replacing safety valve, argon arc welding there cannot be steam in scene in welding, to building ring
Border is more demanding, therefore it is required that boiler drum wants decrease temperature and pressure, reaches replacement safety valve condition.
Traditional replacing options need to be replaced dry coke quenching blowing out after entire circulatory system temperature thoroughly reduces.
Dry coke quenching-boiler system cooling process is very long, if it is desired to quick-replaceable boiler drum safety valve, resumes production as early as possible, reduces
Production loss, it is necessary to which one kind can shorten dry coke quenching-boiler system temperature fall time method, reach boiler drum safety as early as possible
The replacement condition of valve.
Summary of the invention
The object of the present invention is to provide a kind of methods of quick-replaceable coke dry quenching boiler drum safety valve, can shorten and reach
It the time of condition needed for replacing safety valve, quickly resumes production, reduces production loss.
To achieve the above object, the present invention is implemented with the following technical solutions:
A kind of method of quick-replaceable coke dry quenching boiler drum safety valve, this method are the gas to coke dry quenching furnace and boiler
It is passed through nitrogen in pipeline, it is cooling that cold water is carried out by the way of covering water operation, while making cold air from boiler using buoyant gas
Manhole, which enters from dry coke quenching fire door, releases mode, quickly reduces coke dry quenching boiler temperature, finally realizes boiler drum safety valve
Quick-replaceable；Steps are as follows for specific method:
1) it is burnt to stop dry coke quenching dress, reduces dry coke quenching material position；
2) valve on oxygen-eliminating device steam-heated pipe line is gradually closed, oxygen-eliminating device heating steam is gradually closed, by oxygen-eliminating device
Water temperature is reduced to room temperature；
3) bulkhgead gate at coke discharging to be closed, dry quenching circulating fan revolution is run with 400-600 revs/min of speed, by
Coke dry quenching furnace temperature is gradually reduced to 590-610 DEG C；
4) it is passed through nitrogen into coke dry quenching furnace and boiler, opens bleeding valve, emergency diffusion valve is opened, by main steam pipe
Stop valve on road is closed, then main steam line diffusion valve is opened；
5) it using set water operation mode, is pumped by deaerated feedwater, the water in sweet-water tank is directly squeezed into boiler, to dry
Quenching boiler carries out the operation of cold water jacket water, quickly reduces boiler temperature to 85-95 DEG C；
6) boiler manhole door and dry coke quenching bell are opened, enters cold air from dry coke quenching bell from boiler manhole and is discharged,
Boiler temperature is further decreased to 65-75 DEG C；
7) open boiler drum manhole, residue vapor in boiler drum is released, and using axial flow blower alignment manhole into
Row purging；
8) after removing failsafe valve, boiler drum and safety valve interface channel are blocked with tamper, safety valve is more
It is taken out after changing from drum manhole by tamper.
Compared with prior art, the beneficial effects of the present invention are:
1) present invention can shorten the time that boiler drum reaches replacement safety valve condition, and replacement pot is reached in 8 hours
Condition required for furnace drum safety valve.
2) present invention can reduce the accident treatment time, reduce production loss.
Detailed description of the invention
Fig. 1 is dry coke quenching-boiler system artwork in the present invention.
In figure: 5. emergency diffusion valve of bolt in 1. charging apparatus, 2. bleeding valve, 3. coke dry quenching furnace, 4. dry coke quenching
6. 10. boiler drum of disposable dust remover 7. boiler inlet, 8. boiler drum safety valve, 9. manhole, 11. boiler drum
Top blow valve 12. 2 crosses 13. oxygen-eliminating device of outlet conduit blow valve, 14. deaerated feedwater and pumps 15. boiler feed pumps 16.
20. circulating fan of boiler manhole door 17. boiler, 18. boiler export, 19. secondary filter, 21. heat exchange of heat pipe
22. bulkhgead gate
Specific embodiment
Embodiments of the present invention are further illustrated combined with specific embodiments below:
As shown in Figure 1, dry coke quenching-boiler system is by coke dry quenching furnace 3, boiler 17 and for gas path pipe connecting the two
And the waterway pipe composition of boiler 17.The high-temperature flue gas that coke dry quenching furnace 3 generates is exchanged heat by entering boiler 17 after primary dedusting,
Nitrogen cooling is added in flue gas after the heat exchange of boiler 17 after final dusting, comes back in coke dry quenching furnace 3 and puts out for furnace bottom is dry
Coke cooling.
Boiler 17 by connecting oxygen-eliminating device 13 with feedwater piping to boiler water pump 15, the recirculated water in boiler 17 need by
Reenter in boiler 17 and recycle after 13 deoxygenation of oxygen-eliminating device, into oxygen-eliminating device 13 before water need to be heated in steam-heated pipe line
To certain temperature.Also in addition connection deaerated feedwater pump 14 is used to be 17 moisturizing of boiler oxygen-eliminating device 13, and deaerated feedwater pump 14 passes through simultaneously
Another way pipeline is directly connected to boiler 17.
The top of boiler drum 10 is arranged in boiler drum safety valve 8, is additionally provided with manhole in the two sides of boiler drum 10
9.When boiler drum safety valve 8 damages, blowing out cooling replacement is needed.The present invention is special for dry coke quenching-boiler system itself
Point provides a kind of method of quick-replaceable coke dry quenching boiler drum safety valve, and this method is to coke dry quenching furnace 3 and boiler 17
Nitrogen is passed through in gas piping, it is cooling to carry out cold water by the way of covering water operation, while using buoyant gas make cold air from
Boiler manhole, which enters from dry coke quenching fire door, releases mode, quickly reduces coke dry quenching boiler temperature, final to realize boiler drum safety
The quick-replaceable of valve 8；Steps are as follows for specific method:
1) it is burnt to stop dry coke quenching dress, reduces dry coke quenching material position.
Before operation starts, it is burnt that coke dry quenching furnace 3 stops dress.Coke dry quenching furnace is dropped after material position is exposed to chute mouth and stops row
It is burnt.Then device 1 is loaded into disconnect with bell.And it is loaded into the equipment such as all oil pipes in fire door area, cable and carries out fire prevention, prevents
High temperature measure.
2) valve on oxygen-eliminating device steam-heated pipe line is gradually closed, oxygen-eliminating device heating steam is gradually closed, by oxygen-eliminating device
13 circulating water temperatures for entering boiler are reduced to room temperature (25 DEG C or so).
3) bulkhgead gate 22 at coke discharging is closed, 20 revolution of dry quenching circulating fan is transported with 400-600 revs/min of speed
Row, gradually decreases 3 temperature of coke dry quenching furnace to 590-610 DEG C；
The temperature of coke dry quenching furnace 3 Yu boiler 17, while 3 bottom of coke dry quenching furnace in order to prevent are gradually reduced by wind path circulation
Air enter in furnace the burning for causing coke, bulkhgead gate 22 at coke discharging need to be closed.
4) 600 DEG C are down to 7 temperature of boiler gas entrance to run hereinafter, stopping circulating fan 20.Coke is being dry-cleaned into setting
It is closed on furnace for importing the middle bolt 4 of air to coke dry quenching furnace.Dry coke quenching final dusting is rushed nitrogen point to open, to coke dry quenching furnace 3
Be passed through nitrogen in boiler 17, open bleeding valve 2, open emergency diffusion valve 5, the stop valve on main steam line is closed
It closes, then main steam line diffusion valve is opened, further decrease the gas path temperature of coke dry quenching furnace 3 and boiler 17.
5) water in sweet-water tank is directly squeezed into boiler 17 by deaerated feedwater pump 14 using set water operation mode,
The operation of cold water jacket water is carried out to coke dry quenching boiler, quickly reduces boiler temperature to 85-95 DEG C.
While to gas path pipe inflated with nitrogen, boiler feed pump 15 is operated normally, and is opened main steam line etc. and is dredged everywhere
The sewage draining valve of water and evaporator and water-cooling wall etc..When 10 pressure of boiler drum is down to zero, unlatching two is crossed outlet conduit and is put
Empty valve 12, boiler drum top blow valve 11.Set water operation is carried out, boiler feed pump 15 is closed, opens deaerated feedwater pump 14,
Cold water in sweet-water tank is directly squeezed into boiler 17 by deaerated feedwater pump 14, quickly reduces boiler temperature.To warm in furnace water
When degree is reduced to 90 DEG C, interruption opens deaerated feedwater pump 14.
6) boiler manhole door and dry coke quenching bell are opened, enters cold air from dry coke quenching bell from boiler manhole 16 and arranges
Out, boiler temperature is further decreased to 65-75 DEG C.
7) when furnace coolant-temperature gage is reduced to 70 DEG C, boiler drum manhole 9 is opened, residue vapor in boiler drum 10 is put
Out, and using axial flow blower alignment manhole 9 it is purged, steam in drum is blown out.
Hydrophobic valve everywhere is controlled, keeps boiler drum liquid level in -200mm or so, floor manager prevents water from manhole 9
It overflows at place.
8) after removing failsafe valve 8, boiler drum 10 and 8 interface channel of safety valve is blocked with tamper, prevented
Steam seals in, and tamper iron wire or rope are connected, and by the iron wire or rope that connect tamper from boiler drum both ends
Manhole 9 at stretch out, safety valve 8 replace after tamper is taken out from drum manhole 9.
9) after safety valve 9 is replaced, boiler drum manhole door is closed, is gradually resumed production.
Claims (1)
1. a kind of method of quick-replaceable coke dry quenching boiler drum safety valve, which is characterized in that this method be to coke dry quenching furnace and
It is passed through nitrogen in the gas piping of boiler, it is cooling that cold water is carried out by the way of covering water operation, while being made using buoyant gas cold
Air, which enters from boiler manhole from dry coke quenching fire door, releases mode, quickly reduces coke dry quenching boiler temperature, final to realize boiler pot
The quick-replaceable of cylinder safety valve；Steps are as follows for specific method:
1) it is burnt to stop dry coke quenching dress, reduces dry coke quenching material position, coke dry quenching furnace is dropped after material position is exposed to chute mouth and stops coke discharging；
2) valve on oxygen-eliminating device steam-heated pipe line is gradually closed, oxygen-eliminating device heating steam is gradually closed, by oxygen-eliminating device water temperature
It is reduced to room temperature；
3) bulkhgead gate at coke discharging is closed, dry quenching circulating fan revolution is run with 400-600 revs/min of speed, is gradually dropped
Low coke dry quenching furnace temperature is to 590-610 DEG C；
4) 600 DEG C are down to hereinafter, stopping circulating fan operation to boiler gas inlet temperature；It is passed through into coke dry quenching furnace and boiler
Nitrogen opens bleeding valve, opens emergency diffusion valve, the stop valve on main steam line is closed, then by main steam line
Diffusion valve is opened；
5) it using set water operation mode, is pumped, the water in sweet-water tank is directly squeezed into boiler, to dry coke quenching by deaerated feedwater
Boiler carries out the operation of cold water jacket water, quickly reduces boiler temperature to 85-95 DEG C；
6) boiler manhole door and dry coke quenching bell are opened, enters cold air from dry coke quenching bell from boiler manhole and is discharged, into one
Step reduces boiler temperature to 65-75 DEG C；
7) boiler drum manhole is opened, residue vapor in boiler drum is released, and is blown using axial flow blower alignment manhole
It sweeps；
8) after removing failsafe valve, boiler drum and safety valve interface channel is blocked with tamper, prevent steam from sealing in,
And tamper iron wire or rope are connected, and the iron wire for connecting tamper or rope are stretched from the manhole at boiler drum both ends
Out, it is taken out after safe valve replacement from drum manhole by tamper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610312015.0A CN107366895B (en) | 2016-05-12 | 2016-05-12 | Method for rapidly replacing safety valve of drum of dry quenching boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610312015.0A CN107366895B (en) | 2016-05-12 | 2016-05-12 | Method for rapidly replacing safety valve of drum of dry quenching boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107366895A CN107366895A (en) | 2017-11-21 |
| CN107366895B true CN107366895B (en) | 2019-08-27 |
Family
ID=60304384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610312015.0A Active CN107366895B (en) | 2016-05-12 | 2016-05-12 | Method for rapidly replacing safety valve of drum of dry quenching boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107366895B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108624339B (en) * | 2018-05-11 | 2020-09-29 | 鞍钢股份有限公司 | Winter dry quenching furnace annual repair heat preservation method |
| CN108587656B (en) * | 2018-07-03 | 2023-12-22 | 山东钢铁股份有限公司 | Dry quenching circulating system and nitrogen charging replacement process |
| CN109575957A (en) * | 2018-11-19 | 2019-04-05 | 包头钢铁（集团）有限责任公司 | A kind of method of dry coke quenching auxiliary hot repair heat preservation decompression |
| CN110467932B (en) * | 2019-09-12 | 2021-06-15 | 石横特钢集团有限公司 | Method for rapidly cooling coke dry quenching boiler |
| CN111575027B (en) * | 2020-04-23 | 2021-06-22 | 包头钢铁（集团）有限责任公司 | Method for comprehensively processing power failure accident of coke dry quenching system |
| CN113308257A (en) * | 2021-06-21 | 2021-08-27 | 马鞍山钢铁股份有限公司 | Method for rapidly cooling tube explosion of coke dry quenching boiler |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08159403A (en) * | 1994-12-01 | 1996-06-21 | Ishikawajima Harima Heavy Ind Co Ltd | Auxiliary vapor controller for boiler |
| FR2738363A1 (en) * | 1995-09-06 | 1997-03-07 | Siemens Ag | SAFETY VALVE DEVICE FOR USE IN PRESSURE MAINTENANCE SYSTEMS OF POWER PLANTS |
| CN1266084A (en) * | 2000-03-23 | 2000-09-13 | 上海宝钢集团公司 | Dry extinguishing coke pot flue pipe local overhauling method and equipment thereof |
| CN101443177A (en) * | 2006-05-17 | 2009-05-27 | 赫斯基注射器成型系统有限公司 | Molding-system valve having knockdown retainer |
| CN103317295A (en) * | 2012-03-22 | 2013-09-25 | 宝山钢铁股份有限公司 | Oxygen valve online repairing method |
-
2016
- 2016-05-12 CN CN201610312015.0A patent/CN107366895B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08159403A (en) * | 1994-12-01 | 1996-06-21 | Ishikawajima Harima Heavy Ind Co Ltd | Auxiliary vapor controller for boiler |
| FR2738363A1 (en) * | 1995-09-06 | 1997-03-07 | Siemens Ag | SAFETY VALVE DEVICE FOR USE IN PRESSURE MAINTENANCE SYSTEMS OF POWER PLANTS |
| CN1266084A (en) * | 2000-03-23 | 2000-09-13 | 上海宝钢集团公司 | Dry extinguishing coke pot flue pipe local overhauling method and equipment thereof |
| CN101443177A (en) * | 2006-05-17 | 2009-05-27 | 赫斯基注射器成型系统有限公司 | Molding-system valve having knockdown retainer |
| CN103317295A (en) * | 2012-03-22 | 2013-09-25 | 宝山钢铁股份有限公司 | Oxygen valve online repairing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107366895A (en) | 2017-11-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107366895B (en) | Method for rapidly replacing safety valve of drum of dry quenching boiler | |
| CN110346511A (en) | A kind of synthesis gas leakage on-line checking and treatment process | |
| CN106390630A (en) | Continuous non-shut-down printing and dyeing waste gas treatment device | |
| CN106967448A (en) | A kind of furnace drying method after the resistance to material large area replacing of dry quenching system | |
| CN106867549A (en) | A kind of coke dry quenching boiler do not stop production realize maintenance method | |
| CN106521062A (en) | Repairing method of blast furnace cooling wall water cooling system | |
| KR101365530B1 (en) | Apparatus and method for controling negative pressure in cokes dry quenching facilities | |
| CN215975886U (en) | Quick leak detection device | |
| CN205244415U (en) | Automatic relief valve of polycrystal ingot furnace | |
| CN107723011A (en) | Method for online water cutting of hole-pulling of negative pressure gas system | |
| CN210856172U (en) | Structure is restoreed fast on line to blast furnace stave water pipe damage | |
| CN107058658A (en) | Blast furnace copper cooling plate leakage check-up method and blocking method is cut online | |
| CN106352707A (en) | Oil-water cooling spraying gun system and cooling method of top-blowing type melting pool smelting furnace | |
| CN112760446A (en) | Converter water leakage monitoring system and method | |
| CN207527598U (en) | A kind of dangerous waste incineration system dual firing chamber bottom steam retracting device | |
| CN207247927U (en) | A kind of new MGGH smoke processing systems | |
| CN110184402A (en) | A method of it is online quickly to determine the specific leak source of blast furnace cooling stave | |
| CN109404875A (en) | A kind of cold conditions purging method of the ultra supercritical double reheat boiler without circulating pump | |
| KR20130014802A (en) | Apparatus for perceiving a breakdown of stave equipment | |
| CN213388506U (en) | Improved dry quenching water-cooling sleeve structure | |
| JP2015177560A (en) | Hydrogen gas dryer and rotary electric machine system comprising the same | |
| CN113124255B (en) | Hot air piping system maintenance cooling method | |
| CN206428183U (en) | Coke dry quenching furnace circulating water line with emergency cooling system | |
| KR101495403B1 (en) | Apparatus for preventing deformation of dust collecting hood in dry fire-extinguishing appliance of coke | |
| CN203348580U (en) | High-temperature-resistant water-cooling gate valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |