CN1126910C - Ceramic burner for gases and regenerative heat generator provided with said burner - Google Patents
Ceramic burner for gases and regenerative heat generator provided with said burner Download PDFInfo
- Publication number
- CN1126910C CN1126910C CN98812450A CN98812450A CN1126910C CN 1126910 C CN1126910 C CN 1126910C CN 98812450 A CN98812450 A CN 98812450A CN 98812450 A CN98812450 A CN 98812450A CN 1126910 C CN1126910 C CN 1126910C
- Authority
- CN
- China
- Prior art keywords
- passage
- outlet
- feeding
- combustion
- ceramic burner
- 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 31
- 239000007789 gas Substances 0.000 title claims abstract description 14
- 230000001172 regenerating effect Effects 0.000 title claims abstract description 10
- 238000002485 combustion reaction Methods 0.000 claims abstract description 57
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 238000007599 discharging Methods 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 abstract description 3
- 238000005192 partition Methods 0.000 abstract 2
- 239000002737 fuel gas Substances 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 241000628997 Flos Species 0.000 description 4
- 239000011449 brick Substances 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
- F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/74—Preventing flame lift-off
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2209/00—Safety arrangements
- F23D2209/20—Flame lift-off / stability
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/21—Burners specially adapted for a particular use
- F23D2900/21001—Burners specially adapted for a particular use for use in blast furnaces
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
- Pre-Mixing And Non-Premixing Gas Burner (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
Ceramic burner for gases, especially for use in the combustion chamber (2) of a regenerative heat generator, such as a hot-blast stove (1) for a blast furnace (1), which ceramic burner is provided with a first feed duct (13) for a first combustion component, such as a combustible gas, and with a second feed duct (12) for a second combustion component, such as combustion air, the first feed duct (13) opening out into a substantially elongate outlet opening (15) and the second feed duct opening out into at least one second outlet opening (14), the latter opening(s) extending essentially parallel to and downstream of the first outlet opening, a partition (11), which continues as far as the two outlet openings (14, 15), furthermore being situated between the first feed duct (13) and the second feed duct (12), in which ceramic burner at least one of the first and second feed ducts (12, 13) is provided with means for imparting turbulence, during operation, to the combustion component emerging through the duct(s) in question, which turbulence is such that a combustible mixture of the two combustion components is formed upstream of the end of the partition (11).
Description
Technical field
The present invention relates to a kind of ceramic burner (ceramic burner) that is used for gas, be used in particular for the combustion chamber of regenerative heat generator as the hot-blast stove that is used for blast furnace, this ceramic burner is provided with second feeding-passage that is used to carry first feeding-passage of first kind of combustion components such as fuel gas and is used to carry second kind of combustion components such as combustion air, described first feeding-passage leads to an outlet of in fact extending, described second feeding-passage leads to one second outlet at least, the latter's outlet is extended in the first outlet downstream along the direction parallel with first outlet basically, further between first feeding-passage and second feeding-passage, the combustion chamber is directly led in described outlet for dividing plate that extends to described two outlets.The invention still further relates to the regenerative heat generator that is provided with this ceramic burner.
Background technology
When starting blast furnace, a plurality of hot-blast stoves accumulate near this blast furnace, thereby the conversion from a hot-blast stove to another hot-blast stove means all the time can supply with hot-air as reactive component to blast furnace by the floss hole of a hot-blast stove that heats.When a hot-blast stove separates with blast furnace, can it be reheated by the gas of ceramic burner by burning, so, hot flue gas flow through the combustion chamber and the storage hot well, this storage hot well absorbs the heat of hot flue gas, gives the air of supplying with hot-blast stove by inlet thereby this heat can be discharged in operating procedure subsequently once more.
In order to improve the efficient of device, it is very important that the combustion components of supplying with ceramic burner was as far as possible fully burnt before hot flue gas is flowed through the storage hot well.For this reason, designed various structure for ceramic burner.In the burner of the known type of being mentioned, the embodiment that is provided with single fuel gas feeding-passage and single combustion air feeding-passage is known.And fuel gas passage is positioned at central authorities between two combustion air feeding-passages structure also is known.
The outlet of combustion air feeding-passage comprises that the structure of single opening also is known, and this outlet is divided into one group of independent opening also is known.For example in European patent EP 0,090, back a kind of structure has been described in 096.
Disclose a kind of ceramic burner that is used for burning gases and Air mixing chamber that has in DE 2700786, this mixing chamber is positioned at the upstream, combustion chamber, and the passage with limited cross section separates itself and combustion chamber.In mixing chamber, this passage with limited cross section has stoped the burning of mixture.Because the combustion chamber is directly led in the outlet of combustion gas and air in ceramic burner of the present invention, and the device that is used to produce eddy current forms flammable mixture near the dividing plate end, so flammable mixture takes fire from this device.
EP 0090096 has described a kind of ceramic burner, and wherein the outlet of combustion gas and air is made into definite shape, starts from these outlets and the eddy current in the combustion chamber so that produce.And do not have openly such as the such isolated system of rapid those widened sections, so that in the upstream of outlet and near the position generation eddy current of dividing plate end and the mixture of combustion gas and air.
At US 3,837, disclosed the prior art of ceramic burner in 793, on this basis, the present invention improves.
Though known structure has made efficiency of combustion significantly improve, yet we find, further improve remaining possible.Particularly, have been found that it is very important making flame burning remain on the as close as possible burner in burner top from start to finish.This be because, if this burning occurs in higher height place, then, cause flame fluctuation because combustion components is slowly mixed, and burning position may begin to fluctuate significantly, this may cause the vibration of whole device.
Summary of the invention
Therefore, the purpose of this invention is to provide such device, this device in fact stably carries out burning, preferably is in close proximity to outlet.
Have now found that a solution, it not only can be used for having one and two structures that are used for the feeding-passage of second kind of combustion components, but also the outlet that can be used for each feeding-passage is single opening or the structure that is divided into a plurality of independent openings.
The invention provides a kind of ceramic burner, be used at the combustion chamber of the regenerative heat generator that is used for blast furnace burning gases, described ceramic burner is provided with first feeding-passage and second feeding-passage that is used for second kind of combustion components that are used for first kind of combustion components, described first feeding-passage leads to an outlet of in fact extending, described second feeding-passage leads to one second outlet at least, the latter's outlet is extended above first outlet along the direction parallel with first outlet basically, one dividing plate extends to two outlets, and between first feeding-passage and second feeding-passage, the combustion chamber is directly led in described outlet, wherein, at least one is provided with and is used for making in the course of the work combustion components to produce the device of eddy current when discharging via described passage in first and second feeding-passages, this eddy current makes the flammable mixture of two kinds of combustion components form near the dividing plate end and below the outlet in described extension, the described device that is used to produce eddy current comprises the rapid those widened sections of the cross section of an above-mentioned passage, this rapid those widened sections be positioned at least the first and/or second feeding-passage outlet near, this rapid those widened sections is formed by the profile of dividing plate, and this rapid those widened sections back is until the end of dividing plate is a those widened sections gradually, thereby forms a minor air cell.
In fact the present invention comprises: at least one in first and second feeding-passages is provided with and is used for making in the course of the work combustion components to produce the device of eddy current when discharging via above-mentioned passage, and described eddy current makes the flammable mixture of two kinds of combustion components be formed near the dividing plate end and below the outlet of described extension.We find, if described device comprises the rapid those widened sections of the cross section of an above-mentioned passage, this rapid those widened sections is positioned near the outlet of the first feeding-passage and/or second feeding-passage at least, then described eddy current just can produce by simple mode, this rapid those widened sections is formed by the profile of dividing plate, and this rapid those widened sections back is until the end of dividing plate is a those widened sections gradually, thereby forms a minor air cell.In the position of rapid those widened sections, the combustion components that flows in the exceptional space that is produced through this those widened sections will produce eddy current, and described eddy current also carries another kind of combustion components, thereby form flammable mixture in eddy current.Because eddy current has low flow velocity longitudinally along the combustion chamber, therefore this flammable mixture can just be lighted at this place immediately.Thereby make the flame that is produced be not easy " to be blown away " from the burner nozzle head.
Certainly, sharply those widened sections must be enough wide, to guarantee sufficient eddy current.We find, if sharply those widened sections account for described passage initial cross sectional 20% to 35%, will obtain good result.
We find, if sharply the those widened sections back is until the end of dividing plate is a those widened sections gradually, thereby form a minor air cell, then not only can obtain to help the size of the rapid those widened sections of new construction success, and can obtain optimum efficiency.Because the effect of those widened sections gradually, formed minor air cell has reached enough volumes so that the gas of more volume produces eddy current, thereby it is mixed into flammable mixture.This has further guaranteed to form just the stability of flame above the dividing plate end.
Except described ceramic burner, the invention still further relates to a kind of regenerative heat generator, for example a kind of hot-blast stove that is used for blast furnace, it is provided with one and is used to supply with the supply port of wanting heated gas and one in order to discharge heated gas purging mouth, described heater comprises a combustion chamber and a storage hot well, for the heat hot generator, described combustion chamber is provided with a ceramic burner, and this ceramic burner is the ceramic burner of the above-mentioned type.
Description of drawings
The present invention will be described in more detail below with reference to three width of cloth accompanying drawings:
Fig. 1 shows the hot-blast stove that is used for blast furnace as an embodiment of regenerative heat generator;
Fig. 2 shows the thin II of portion among Fig. 1 with the ratio of amplifying;
Fig. 3 shows another embodiment of this thin portion.
The specific embodiment
In Fig. 1, heater that is the hot-blast stove form that is used for blast furnace of reference number 1 expression.This hot-blast stove comprises a combustion chamber 2 and a storage hot well 3 that is separated each other by a wall 4.Ceramic burner 5 is positioned at the bottom of combustion chamber.The combustion air that is used for ceramic burner is supplied with by interface channel 6, and the fuel that is the fuel gas form is supplied with by interface channel 7.The mixture of combustion air and fuel gas burns in combustion chamber 2.The flue gas that burning is discharged rises in combustion chamber 2, turns to through curved top 8, through filling up the storage hot well 3 of refractory brick (not shown), herein sensible heat is discharged to refractory brick then.The flue gas that is cooled by this process leaves hot-blast stove through floss hole 9, there is shown one of them floss hole.
After refractory brick is heated to enough temperature, stop to supply with fuel and combustion air by passage 6 and 7, afterwards, supply with cold air by floss hole 9.This cold air storage thermal region of storage in the hot well 3 of flowing through then is heated herein, leaves hot-blast stove through aperture 10 then.Distribution system is connected with a hot-air (promptly described " hot blast ") in aperture 10, so that it can be supplied to blast furnace.
The fuel gas of supplying with via interface channel 1 upwards changes and enters first feeding-passage 13 that is used for fuel gas, and interface channel 6 is merged into second feeding-passage 12 that is used for combustion air.Dividing plate 11 is separated feeding- passage 12 and 13 mutually.
Structure around dividing plate 11 tops is represented with label II, and is at length illustrated in Fig. 2 with the ratio of amplifying.Corresponding reference number relates to corresponding parts among Fig. 2 among Fig. 1.In Fig. 2, as can be seen, the outlet 14 of feeding-passage 12 is positioned at higher position for the outlet 15 of the passage 13 that is used for fuel gas, and with its at angle.Thereby air stream can penetrate in the gas-flow, and the result mixes them, thereby has formed flammable mixture.
Feeding-passage 13 is provided with a rapid those widened sections 16 that obtains by dividing plate 11 parts are narrowed down just below outlet 15.This rapid those widened sections 16 and 17 adjacency of those widened sections gradually along outlet 15 directions.Thereby, in rapid those widened sections 16, formation one minor air cell 18 between those widened sections 17 and the outlet 15 gradually.In minor air cell 18, the part gas-flow has produced the strong eddy motion that extends to outlet 15 tops just, thereby it is taken away combustion air from passage 12.As a result, formed abundant flammable mixture in minor air cell 18, this flammable mixture has the low speed component on the main direction of combustion chamber 2 of flowing through.If the flammable mixture that this is abundant is lighted, then flamjne front will keep highly stable near the free end of dividing plate 11.Thereby avoided the fluctuation of flame, thereby and also prevented oscillation phenomenon in total.And, improved efficiency of combustion.
Mention the structure that the present invention is not limited to illustrate above.In many cases, make ceramic burner have following preferred structure, wherein, two feeding-passages 12 that are used for combustion air
aWith 12
bBe provided with symmetrically with respect to fuel gas feeding-passage 13.In this embodiment, as shown in Figure 3, two dividing plates 11 are set
aWith 11
bReplace single dividing plate 11, and, two outlets 14 are arranged
aWith 14
bBe used for feeding-passage 12
aWith 12
b
If will be used for the outlet 14 (or 14 of combustion air
aWith 14
b) be divided into a plurality of independent openings, can obtain good equally effect.
Claims (3)
1. ceramic burner, be used at the combustion chamber that is used for the regenerative heat generator of blast furnace (1) (2) burning gases, described ceramic burner is provided with one and is used for first feeding-passage (13) of first kind of combustion components and second feeding-passage (12) that is used for second kind of combustion components, described first feeding-passage (13) leads to an outlet (15) of in fact extending, described second feeding-passage leads to one second outlet (14) at least, the latter's outlet is extended above first outlet along the direction parallel with first outlet basically, one dividing plate (11) extends to two outlets (14,15), and be positioned between first feeding-passage (13) and second feeding-passage (12), described outlet (14,15) directly lead to combustion chamber (2), wherein, first and second feeding-passages (12,13) at least one is provided with and is used for making in the course of the work combustion components to produce the device of eddy current when discharging via described passage in, this eddy current makes the flammable mixture of two kinds of combustion components form near dividing plate (11) is terminal and in outlet (15) below of described extension, the described device that is used to produce eddy current comprises the rapid those widened sections (16) of the cross section of an above-mentioned passage, this rapid those widened sections is positioned at the outlet (14 of at least the first and/or second feeding-passage, 15) near, this rapid those widened sections (16) is formed by the profile of dividing plate (11), and this rapid those widened sections (16) back is until the end of dividing plate (11) is a those widened sections (17) gradually, thereby forms a minor air cell.
2. ceramic burner according to claim 1 is characterized in that: described rapid those widened sections (16) account for described passage initial cross sectional 20% to 35%.
3. the regenerative heat generator that is used for blast furnace, it is provided with one and is used to supply with the supply port (9) of wanting heated gas and one in order to discharge heated gas purging mouth (10), described heater comprises a combustion chamber (2) and a storage hot well (3), for the heat hot generator, described combustion chamber (2) is provided with a ceramic burner (5), it is characterized in that: described ceramic burner is the ceramic burner according to the described type of one of above claim.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL1007581 | 1997-11-19 | ||
| NL1007581A NL1007581C2 (en) | 1997-11-19 | 1997-11-19 | Ceramic burner for gases and regenerative heat generator provided with it. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1282408A CN1282408A (en) | 2001-01-31 |
| CN1126910C true CN1126910C (en) | 2003-11-05 |
Family
ID=19766038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98812450A Expired - Fee Related CN1126910C (en) | 1997-11-19 | 1998-11-18 | Ceramic burner for gases and regenerative heat generator provided with said burner |
Country Status (13)
| Country | Link |
|---|---|
| EP (1) | EP1046011B1 (en) |
| CN (1) | CN1126910C (en) |
| AR (1) | AR017186A1 (en) |
| AU (1) | AU735282B2 (en) |
| DE (1) | DE69802116T2 (en) |
| HU (1) | HUP0100067A3 (en) |
| NL (1) | NL1007581C2 (en) |
| PL (1) | PL340596A1 (en) |
| RU (1) | RU2208201C2 (en) |
| SK (1) | SK7532000A3 (en) |
| UA (1) | UA49099C2 (en) |
| WO (1) | WO1999026020A1 (en) |
| ZA (1) | ZA9810588B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688666B (en) * | 2007-05-07 | 2011-10-05 | 保尔伍斯耐火材料与工程有限责任公司 | Ceramic burner |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2233836B1 (en) | 2009-03-23 | 2015-07-29 | Siemens Aktiengesellschaft | Swirler, method for reducing flashback in a burner with at least one swirler and burner |
| LU91572B1 (en) * | 2009-05-20 | 2010-11-22 | Wurth Paul Sa | Method for operating a regenerative heater. |
| ES2567784T3 (en) | 2009-11-26 | 2016-04-26 | Linde Ag | Method for heating a blast furnace stove |
| US9151492B2 (en) | 2011-02-22 | 2015-10-06 | Linde Aktiengesellschaft | Heating apparatus |
| US20120214115A1 (en) * | 2011-02-22 | 2012-08-23 | Cameron Andrew M | Method for heating a blast furnace stove |
| JP4955117B1 (en) * | 2011-03-15 | 2012-06-20 | 新日鉄エンジニアリング株式会社 | Top-fired hot air furnace |
| JP4892107B1 (en) * | 2011-03-23 | 2012-03-07 | 新日鉄エンジニアリング株式会社 | Top-fired hot air furnace |
| EP2584052A1 (en) * | 2011-10-19 | 2013-04-24 | Paul Wurth S.A. | Method of operating regenerative heaters in blast furnace plant |
| DE102021111187A1 (en) * | 2021-05-14 | 2022-11-17 | Enertech Gmbh | Hydrogen gas burner device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1202797A (en) * | 1958-07-16 | 1960-01-13 | Genevet Groll & Cie | Gas burner |
| NL6900740A (en) * | 1969-01-16 | 1970-07-20 | ||
| NL7003722A (en) * | 1970-03-16 | 1971-09-20 | ||
| US3837793A (en) * | 1971-05-10 | 1974-09-24 | Koninklijke Hoogovens En Staal | Ceramic burner for use in an air-preheater or hot blast stove for a blast furnace plant |
| DE2700786C3 (en) * | 1977-01-11 | 1980-05-14 | Hermann Rappold & Co Gmbh, 5160 Dueren | Ceramic gas burner for wind heaters |
| DE3263643D1 (en) | 1982-03-30 | 1985-06-13 | Hoogovens Groep Bv | A ceramic burner for gas, particularly for a hot-blast stove for a blast furnace |
| NL8702036A (en) * | 1987-08-31 | 1989-03-16 | Hoogovens Groep Bv | CERAMIC BURNER FOR GAS FOR A FIRE SHAFT FROM A WIND HEATER OF A MAIN OVEN. |
-
1997
- 1997-11-19 NL NL1007581A patent/NL1007581C2/en not_active IP Right Cessation
-
1998
- 1998-11-18 SK SK753-2000A patent/SK7532000A3/en unknown
- 1998-11-18 RU RU2000115574/06A patent/RU2208201C2/en not_active IP Right Cessation
- 1998-11-18 AU AU17568/99A patent/AU735282B2/en not_active Ceased
- 1998-11-18 PL PL98340596A patent/PL340596A1/en unknown
- 1998-11-18 HU HU0100067A patent/HUP0100067A3/en unknown
- 1998-11-18 UA UA2000063470A patent/UA49099C2/en unknown
- 1998-11-18 WO PCT/EP1998/007540 patent/WO1999026020A1/en not_active Application Discontinuation
- 1998-11-18 CN CN98812450A patent/CN1126910C/en not_active Expired - Fee Related
- 1998-11-18 DE DE69802116T patent/DE69802116T2/en not_active Expired - Fee Related
- 1998-11-18 EP EP98962386A patent/EP1046011B1/en not_active Expired - Lifetime
- 1998-11-19 ZA ZA9810588A patent/ZA9810588B/en unknown
- 1998-11-19 AR ARP980105875A patent/AR017186A1/en active IP Right Grant
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688666B (en) * | 2007-05-07 | 2011-10-05 | 保尔伍斯耐火材料与工程有限责任公司 | Ceramic burner |
| TWI427244B (en) * | 2007-05-07 | 2014-02-21 | 保爾伍斯耐火材料與工程有限責任公司 | Ceramic burner |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2208201C2 (en) | 2003-07-10 |
| SK7532000A3 (en) | 2001-03-12 |
| AU1756899A (en) | 1999-06-07 |
| CN1282408A (en) | 2001-01-31 |
| AR017186A1 (en) | 2001-08-22 |
| NL1007581C2 (en) | 1999-05-20 |
| DE69802116D1 (en) | 2001-11-22 |
| PL340596A1 (en) | 2001-02-12 |
| ZA9810588B (en) | 1999-05-25 |
| HUP0100067A2 (en) | 2001-06-28 |
| AU735282B2 (en) | 2001-07-05 |
| EP1046011A1 (en) | 2000-10-25 |
| HUP0100067A3 (en) | 2001-12-28 |
| EP1046011B1 (en) | 2001-10-17 |
| WO1999026020A1 (en) | 1999-05-27 |
| DE69802116T2 (en) | 2002-06-20 |
| UA49099C2 (en) | 2002-09-16 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20031105 Termination date: 20091218 |