CN107460266A - A kind of slag dry granulation takes hot systems - Google Patents
A kind of slag dry granulation takes hot systems Download PDFInfo
- Publication number
- CN107460266A CN107460266A CN201710888032.3A CN201710888032A CN107460266A CN 107460266 A CN107460266 A CN 107460266A CN 201710888032 A CN201710888032 A CN 201710888032A CN 107460266 A CN107460266 A CN 107460266A
- Authority
- CN
- China
- Prior art keywords
- slag
- heat
- exchanger rig
- control device
- overflow plate
- 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.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/0054—Slag, slime, speiss, or dross treating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture Of Iron (AREA)
Abstract
A kind of slag dry granulation takes hot systems, including the conveying of slag stream and control device, granulating device, heat-exchanger rig and regulation device.Slag stream conveys and control device goes out circulation road, slag chute and overflow plate including slag.Overflow plate is arranged on the slag chute port of export, between slag chute and heat-exchanger rig；Granulating device is arranged on the front end of heat-exchanger rig, and below slag chute；The jet of granulating device is against heat-exchanger rig；Regulation device includes the temperature measuring equipment, control device and granulation regulation and control motor being arranged on heat-exchanger rig；Temperature measuring equipment is used for the temperature for measuring heat-exchanger rig, and the temperature signal of heat-exchanger rig is transferred to the control device being connected with temperature measuring equipment；Control device adjusts position and the injection pressure of granulating device according to temperature signal.Overflow plate can move up and down.Slag stream of the present invention is controllable in order, granulating device position, the online optimising and adjustment granulation effect of pressure, and heat-exchanger rig is safe and reliable to operation.
Description
Technical field
The present invention relates to a kind of slag dry granulation to take hot systems, belongs to energy project field.
Background technology
Slag is high temperature, molten state product in metallurgical production process, blast furnace slag, slag, the copper ashes of such as liquid, its
In contain abundant heat resource.
Such as liquid blast furnace is a kind of typical slag, the blast furnace slag of quenching forms the amorphous of substantial amounts of glass phase
State material, there is higher hydration activity, be the quality raw materials for producing the construction materials such as cement.Meanwhile liquid blast furnace temperature
Between 1300 DEG C to 1600 DEG C, there is very high heat energy recycle to be worth.
High-temperature slag dry granulation and recovery waste heat progress heat utilization, it is the target of current techniques exploitation.
The content of the invention
It is an object of the invention to provide a kind of slag dry granulation to take hot systems, sets about from slag flow control so that slag stream
Orderly controllable entering is granulated, heat-exchanger rig, and is granulated effect by granulating device position, the online optimising and adjustment of pressure and is ensured to change
Thermal is safe for operation.
The present invention is achieved by the following technical solutions：
A kind of slag dry granulation takes hot systems, and the system includes slag stream conveying and control device, granulating device and heat exchange dress
Put；
The slag stream conveying and control device go out circulation road, slag chute and overflow plate including slag；The slag chute is arranged on slag and gone out
Below circulation road end, the slag chute outlet is arranged on the heat-exchanger rig front end；The overflow plate is arranged on the slag chute and gone out
Mouth end, between the slag chute and the heat-exchanger rig；
The granulating device is arranged on the front end of the heat-exchanger rig, and below the slag chute；The spray of the granulating device
Loophole is against the heat-exchanger rig.
As further improved technical scheme, the system also includes regulation device, and the regulation device includes setting
Temperature measuring equipment, control device and granulation regulation and control motor on the heat-exchanger rig；The temperature measuring equipment is used to measure described change
The temperature of thermal, and the temperature signal of the heat-exchanger rig is transferred to the control dress being connected with the temperature measuring equipment
Put；The control device adjusts the distance of the granulating device and the heat-exchanger rig or the granulating device according to temperature signal
Ejection medium pressure.
In above-mentioned technical proposal, control device selects PLC control unit.
In above-mentioned technical proposal, the control device regulates and controls the rotation of motor according to the temperature signal regulation granulation；Institute
State granulation regulation and control motor by being granulated motor transmission shaft with the granulating device to be connected, adjust the granulating device and the heat exchange
The distance of device.
As further improved technical scheme, the overflow plate is portable overflow plate, can be in the slag chute port of export
Move up and down, adjust slag depth and slag overflow height in the slag chute.
In above-mentioned technical proposal, the overflow plate is in tilted layout, and overflow plate top is close to the inclination of heat-exchanger rig direction.
As further improved technical scheme, the system also includes overflow plate control device, the overflow plate control
Device is used for the upper-lower position for adjusting the overflow plate.
In above-mentioned technical proposal, the excess flow control includes overflow plate regulation and control motor and connects overflowing for the overflow plate
Stream regulation and control power transmission shaft.
In above-mentioned technical proposal, the slag chute bottom tilts towards the heat-exchanger rig, the slag chute bottom and level side
To angle α be 0 ~ 20 °.
In above-mentioned technical proposal, top is additionally provided with slag trap in the middle part of the slag chute.
As further improved scheme, the jet direction of the granulating device can be in vertical direction or the side of level two
Rotated to regulation.
The present invention has advantages below and high-lighting effect：Tilting slag circulation road causes slag to convey smooth, packaged type
It is controllable that overflow plate make it that slag enters heat-exchanger rig granulation, the flow of heat exchange and uniformity；Granulating device is adjusted by control device
Save position so that granulation, heat transfer effect are controllable.
Brief description of the drawings
Fig. 1 is that a kind of slag dry granulation involved in the present invention takes hot systems schematic diagram.
Fig. 2 is that a kind of slag dry granulation involved in the present invention takes hot systems A view schematic diagrames.
In figure：1- slag mouths；2- slags go out circulation road；3- slag chutes；4- slag traps；5- overflow plates；6- heat exchange dresses
Put；7- temperature measuring equipments；8- control devices；9- granulation regulation and control motors；10- is granulated motor transmission shaft；11- granulating devices；
12- gears；13- racks；14- slideways；15- bearings；16- supports；17- overflow plates regulate and control motor；18- overflows regulate and control
Power transmission shaft.
Embodiment
The embodiment and the course of work of the present invention are further described below in conjunction with the accompanying drawings.
The orientation such as upper, lower, left, right, front and rear in present specification term be based on position relationship shown in the drawings and
Establish.Accompanying drawing is different, then corresponding position relationship is also possible to change therewith, therefore can not be interpreted as with this to protecting model
The restriction enclosed.
As shown in figure 1, a kind of slag dry granulation takes hot systems, including the conveying of slag stream and control device, granulating device 11,
Heat-exchanger rig 6 and regulation device.Boiler or other heat exchangers can be selected in heat-exchanger rig 6.
Slag stream conveys and control device goes out circulation road 2, slag chute 3 and overflow plate 5 including slag.Slag goes out circulation road 2 and set
Below the slag mouth 1 of slag device such as blast furnace, it is obliquely installed.Slag chute 3 is arranged on slag and gone out below the end of circulation road 2, connection
To granulating device 11 and heat-exchanger rig 6.The outlet of slag chute 3 is arranged on the front end of heat-exchanger rig 6；The overflow plate 5 is arranged on the slag
The port of export of groove 3, between the slag chute 3 and the heat-exchanger rig 6.Overflow plate 5 is portable overflow plate, can be in the slag chute
3 ports of export move up and down, and adjust slag depth and slag overflow height in the slag chute 3.The top of overflow plate 5 fills towards heat exchange
6 directions are put to be in tilted layout.
The system also includes overflow plate control device, and the overflow plate control device is used to adjust the overflow plate 5
Upper-lower position.The excess flow control includes overflow plate regulation and control motor 17 and connects the overflow regulation and control transmission of the overflow plate 5
Axle 18.
The granulating device 11 is arranged on the front end of the heat-exchanger rig 6, and positioned at the slag chute 3 outlet lower section；It is described
The jet of granulating device 11 against the heat-exchanger rig 6, and the jet alignment of granulating device 11 from the outlet overflows of slag chute 3 and
Under high-temperature slag stream.
The regulation device includes the temperature measuring equipment 7, control device 8 and granulation regulation and control being arranged on the heat-exchanger rig 6
Motor 9.Temperature measuring equipment 7 is arranged in the side wall relative with granulating device 11 of heat-exchanger rig 6.The temperature measuring equipment 7 is used for
The temperature of the heat-exchanger rig 6 is measured, and the temperature signal of the heat-exchanger rig 6 is transferred to and is connected with the temperature measuring equipment 7
The control device 8；The control device 8 regulates and controls the rotation of motor 9 according to the temperature signal regulation granulation；The granulation
Regulation and control motor 9 is connected by being granulated motor transmission shaft 10 with the granulating device 11, is adjusted the granulating device 11 and is changed with described
The distance of thermal 6.Control device 8 selects PLC control unit.PLC is programmable logic controller (PLC)（Programmable
Logic Controller）Abbreviation, it is relatively easy controllable.
High-temperature slag flows out from slag mouth 1, and going out circulation road 2 along slag enters slag chute 3.Slag, which goes out circulation road 2, generally to be compared
Slag chute 3 is precipitous, and being easy to slag quickly to flow prevents from condensing.The bottom of slag chute 3 tilts towards the heat-exchanger rig 6, the slag
The angle α of the bottom of groove 3 and horizontal direction is 0 ~ 20 °, and slag stream smoothness can be caused to be condensed without being detained.
Slag flows out slag chute 3 and enters the top of heat-exchanger rig 6 in an overflow manner under the regulation and control of overflow plate 5, and overflow plate 5 tilts
Arrange to prevent slag drip in the outside plate face of overflow plate 5.The slag that overflow goes out is sprayed in dropping process from granulating device 11
The granulation medium such as steam, water under high pressure or high pressure Dual-Phrase Distribution of Gas olid that loophole sprays dams and moment solidifies and drops to heat exchange dress
Put 6 or be splashed on the wall of heat-exchanger rig 6.The wall of heat-exchanger rig 6 uses water-cooling wall.Temperature measuring equipment 7 is arranged in heat-exchanger rig 6
In an interior side wall relative with granulating device 11, and the transmission wall surface temperature signal that is connected with control device 8.When high temperature melting slag particle
Change particle be largely ejected into granulating device 11 to side wall when, temperature measuring equipment detects high temperature signal, is controlled by control device 8
Side is mobile backward or reduces the jet pressure of granulating device 11 for granulating device 11 processed, so as to reduce the injection of granulating device 11
Distance, the slag particle after granulation is set to fully fall in heat-exchanger rig 6.
As further improved scheme, the jet direction of the granulating device 11 can be in vertical direction or horizontal both sides
Direction regulation rotates, optimization granulation effect.
The middle part of slag chute 3 top is additionally provided with slag trap 4, and slag trap 4 can make the kinetic energy of the high-temperature slag of big flow
Weaken, make the slag flow distribution of spilling slag chute 3 more uniform.
One of embodiment is gear transmission mode as shown in Figure 2, and the both sides of overflow plate 5 and slag chute 3 export both sides
Slideway 14, gear 12, rack 13 are provided with, overflow plate regulation and control motor 17 is connected with overflow regulation and control power transmission shaft 18, and overflow regulation and control pass
Moving axis 18 is fixed by bearing 15 and the support of support 16.Overflow plate regulation and control motor 17 drives overflow regulation and control power transmission shaft 18 to rotate, and enters
And rotated with moving gear 12.Whole overflow plate 5 is driven to be risen or fallen in slideway 14 by the engagement of gear 12 and rack 13.
When slag flow increases, the overflow plate regulation and control rotate counterclockwise of motor 17, two side gears 12 are driven by axis connection
Rotate counterclockwise, the engagement of gear-tooth bar drives whole overflow plate 5 to rise in slideway 14；When slag flow reduces, overflow plate
Regulation and control motor 17 turns clockwise, and drives two side gears 12 to rotate clockwise by axis connection, and the engagement of gear-tooth bar drives whole
Overflow plate 5 declines in slideway 14.After slag input terminates, overflow plate 5 drops to lowest part, now the top of overflow plate 5 and slag chute 3
Bottom is concordant, makes residual sprue whole emptying in slag chute 3, prevents it from being condensed in slag chute 3 and influenceing follow-up operation.
Overflow plate 5 can also regulate and control motor 17 and overflow regulation and control rotary shaft by chain or other kinds of drive in overflow plate
Moved under 18 drive.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. a kind of slag dry granulation takes hot systems, it is characterised in that：The system includes the conveying of slag stream and control device, granulation
Device（11）And heat-exchanger rig（6）；The slag stream conveying and control device go out circulation road including slag（2）, slag chute（3）And overflow
Plate（5）；The slag chute（3）It is arranged on slag and goes out circulation road（2）Below end, the slag chute（3）Outlet is arranged on the heat exchange
Device（6）Front end；The overflow plate（5）It is arranged on the slag chute（3）The port of export, positioned at the slag chute（3）With the heat exchange dress
Put（6）Between；The granulating device（11）It is arranged on the heat-exchanger rig（6）Front end, and be located at the slag chute（3）Lower section；
The granulating device（11）Jet against the heat-exchanger rig（6）.
2. take hot systems according to a kind of slag dry granulation described in claim 1, it is characterised in that：The system also includes adjusting
Control device；The regulation device includes being arranged on the heat-exchanger rig（6）On temperature measuring equipment（7）, control device（8）And granulation
Regulate and control motor（9）；The temperature measuring equipment（7）For measuring the heat-exchanger rig（6）Temperature, and the heat-exchanger rig（6）
Temperature signal be transferred to and the temperature measuring equipment（7）The control device of connection（8）；The control device（8）According to temperature
Spend granulating device described in Signal Regulation（11）With the heat-exchanger rig（6）Distance or the granulating device（11）Ejection medium
Pressure.
3. take hot systems according to a kind of slag dry granulation described in claim 2, it is characterised in that：The control device（8）
From PLC control unit.
4. take hot systems according to a kind of slag dry granulation described in claim 1, it is characterised in that：The overflow plate（5）For
Portable overflow plate, can be in the slag chute（3）The port of export moves up and down.
5. take hot systems according to a kind of slag dry granulation described in claim 1 or 4, it is characterised in that：The overflow plate（5）
It is in tilted layout.
6. take hot systems according to a kind of slag dry granulation described in claim 1 or 4 or 5, it is characterised in that：The system is also
Including overflow plate control device, the overflow plate control device is used to adjust the overflow plate（5）Upper-lower position；The overflow
Control device includes overflow plate regulation and control motor（17）With the connection overflow plate（5）Overflow regulation and control power transmission shaft（18）.
7. take hot systems according to a kind of slag dry granulation described in claim 1, it is characterised in that：The slag chute（3）Bottom
Towards the heat-exchanger rig（6）Tilt, the slag chute（3）The angle α of bottom and horizontal direction is 0 ~ 20 °.
8. take hot systems according to a kind of slag dry granulation described in claim 1, it is characterised in that：The slag chute（3）Middle part
Top is additionally provided with slag trap（4）.
9. take hot systems according to a kind of slag dry granulation described in claim 1, it is characterised in that：The granulating device（11）
Jet direction can be adjusted in vertical direction or the side direction of level two.
10. take hot systems according to a kind of slag dry granulation described in claim 1, it is characterised in that：The control device（8）
According to the temperature signal regulation granulation regulation and control motor（9）Rotation；The granulation regulation and control motor（9）It is driven by being granulated motor
Axle（10）With the granulating device（11）It is connected, adjusts the granulating device（11）With the heat-exchanger rig（6）Distance.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710888032.3A CN107460266A (en) | 2017-09-27 | 2017-09-27 | A kind of slag dry granulation takes hot systems |
| CN201810376546.5A CN108300823A (en) | 2017-09-27 | 2018-04-25 | A kind of slag stream conveying device and slag granulating take hot systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710888032.3A CN107460266A (en) | 2017-09-27 | 2017-09-27 | A kind of slag dry granulation takes hot systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107460266A true CN107460266A (en) | 2017-12-12 |
Family
ID=60553129
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710888032.3A Withdrawn CN107460266A (en) | 2017-09-27 | 2017-09-27 | A kind of slag dry granulation takes hot systems |
| CN201810376546.5A Pending CN108300823A (en) | 2017-09-27 | 2018-04-25 | A kind of slag stream conveying device and slag granulating take hot systems |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810376546.5A Pending CN108300823A (en) | 2017-09-27 | 2018-04-25 | A kind of slag stream conveying device and slag granulating take hot systems |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN107460266A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238492A (en) * | 2018-11-14 | 2019-01-18 | 重庆大学 | A kind of temperature monitoring system of granulator |
| CN109536656A (en) * | 2018-12-24 | 2019-03-29 | 钢研晟华科技股份有限公司 | A kind of roller drains method granulation system |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU88380A1 (en) * | 1993-07-14 | 1995-02-01 | Wurth Paul Sa | Granulation process and device |
| CN2390890Y (en) * | 1999-09-23 | 2000-08-09 | 上海宝钢集团公司 | Changable slag receptacle chute for drum apparatus |
| CN102465188B (en) * | 2010-11-05 | 2013-09-25 | 唐山市嘉恒实业有限公司 | Tank type metallurgical slag treatment apparatus |
| CN102851415B (en) * | 2012-09-24 | 2015-04-15 | 四川环能德美科技股份有限公司 | Recycling system of blast furnace slag heat |
| CN103834753B (en) * | 2013-07-10 | 2016-01-13 | 吕勇 | Molten slag is granulated and solidification equipment fast |
| CN103510312B (en) * | 2013-10-12 | 2016-03-30 | 吴江唯奇布业有限公司 | The uniform quetsch of a kind of sizing |
| CN103835363B (en) * | 2014-02-21 | 2015-07-08 | 武汉圣禹排水系统有限公司 | Electric combined system pipe network intercepting well |
| CN103952877A (en) * | 2014-03-28 | 2014-07-30 | 吴江龙升纺织有限公司 | Novel sizing device |
| CN203855816U (en) * | 2014-03-28 | 2014-10-01 | 吴江龙升纺织有限公司 | Pulp tank with liquid level height regulating device |
| RU2016104804A (en) * | 2014-06-03 | 2017-08-17 | Хэтч Лтд. | METHOD AND DEVICE FOR DRY SLAG GRANULATION WITH DECREASED SLAGING |
| CN104128577B (en) * | 2014-07-01 | 2016-03-30 | 中磁科技股份有限公司 | For the casting part flow arrangement of vacuum metling |
| CN105063256B (en) * | 2015-08-20 | 2017-05-24 | 北京立化科技有限公司 | Metallurgical molten slag pelletization heat energy recycling device |
| CN205119830U (en) * | 2015-10-30 | 2016-03-30 | 南华茂森再生科技有限公司 | Device is emptyd to smelting furnace |
| CN206103429U (en) * | 2016-10-31 | 2017-04-19 | 三门峡玉皇山制药有限公司 | Special novel overflow launder is drawed to realgar |
| CN208234930U (en) * | 2017-09-27 | 2018-12-14 | 中能立化科技有限公司 | A kind of slag stream conveying device and slag granulating take hot systems |
-
2017
- 2017-09-27 CN CN201710888032.3A patent/CN107460266A/en not_active Withdrawn
-
2018
- 2018-04-25 CN CN201810376546.5A patent/CN108300823A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238492A (en) * | 2018-11-14 | 2019-01-18 | 重庆大学 | A kind of temperature monitoring system of granulator |
| CN109536656A (en) * | 2018-12-24 | 2019-03-29 | 钢研晟华科技股份有限公司 | A kind of roller drains method granulation system |
| CN109536656B (en) * | 2018-12-24 | 2020-07-24 | 钢研晟华科技股份有限公司 | Granulating system adopting roller pumping drying method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108300823A (en) | 2018-07-20 |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20171212 |
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| WW01 | Invention patent application withdrawn after publication |