CN108911467A - Sludge drying gas waste-heat utilizes sludge viscosity reducing processing unit - Google Patents
Sludge drying gas waste-heat utilizes sludge viscosity reducing processing unit Download PDFInfo
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- CN108911467A CN108911467A CN201810876331.XA CN201810876331A CN108911467A CN 108911467 A CN108911467 A CN 108911467A CN 201810876331 A CN201810876331 A CN 201810876331A CN 108911467 A CN108911467 A CN 108911467A
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- Prior art keywords
- sludge
- tail gas
- drying
- heat
- pipe
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- 239000010802 sludge Substances 0.000 title claims abstract description 131
- 238000001035 drying Methods 0.000 title claims abstract description 85
- 238000012545 processing Methods 0.000 title claims abstract description 22
- 230000001603 reducing effect Effects 0.000 title claims abstract description 15
- 239000007789 gas Substances 0.000 title claims description 79
- 239000002918 waste heat Substances 0.000 title claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 239000007921 spray Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000012546 transfer Methods 0.000 claims abstract description 5
- 239000003507 refrigerant Substances 0.000 claims abstract description 3
- 239000012159 carrier gas Substances 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 4
- 238000002386 leaching Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 238000004064 recycling Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000009467 reduction Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000010801 sewage sludge Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethanethiol Chemical compound CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/001—Heating arrangements using waste heat
- F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/18—Sludges, e.g. sewage, waste, industrial processes, cooling towers
-
- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The present invention relates to a kind of sludge drying gas waste-heats to utilize sludge viscosity reducing processing unit, including sludge drying machine, sludge carrier pipe, drying tail gas pipeline and spray column, sludge drying machine is connect with sludge carrier pipe, spray column is connected to sludge drying machine by drying tail gas pipeline, tube heater is installed on the outside of sludge carrier pipe, the heating agent process of tail gas heat exchanger and drying tail gas Jing Guo tail gas heat exchanger is installed on the drying tail gas pipeline between sludge drying machine and spray column, the refrigerant flow path of tail gas heat exchanger passes through heat-carrying agent inlet pipe and heat-carrying agent outlet pipe respectively and is connected to form circulation with the heating agent process of tube heater.The present invention can be realized sludge drying tail gas afterheat recycling and cooperate with processing with sludge mobility is improved, and reduces energy consumption, with obvious energy saving effect, improves sludge transfer efficiency and stability.
Description
Technical field
The invention belongs to the technical fields of Treatment of Sludge, are dropped more particularly to a kind of sludge drying gas waste-heat using sludge
Viscous processing unit.
Background technique
In recent years, since rapid economic development and urbanization move forward steadily, China's town sewage and sludge discharge continue
Increase.According to statistics, the annual wet mud yield in China will also continue growing from now on more than 4,000 ten thousand tons.What sewage plant was discharged
Mechanical dehydration moisture percentage in sewage sludge is 80% or so, has the characteristics that high-moisture, high organic, stench and sticky.Wet sludge anhydration
Processing means are important, sludge reduction and stabilisation are not only able to achieve, and further carry out what recycling sludge utilized
No matter important prerequisite fills, burns, agricultural use or heat energy utilization, sludge drying are all very important pre-treatment means.
In numerous sludge drying techniques, heating power desiccation is most mature and effective sludge drying method, has processing
Many advantages, such as amount is big, desiccation speed is fast and takes up little area.At the same time, heating power desiccation also has the shortcomings that high energy consumption, such as：By 1
The ton complete desiccation of wet mud about needs to consume the heat of 2920MJ, converts into 100 kilograms of mark coals.In consumed heat, remove
Fraction radiation loss is outer (within 10%), and the overwhelming majority is finally dried carrier gas band all for evaporating the moisture in sludge
From drying equipment.Although drying tail gas include a large amount of evaporation latent heats, exhaust temperature and sample it is lower, heat energy utilization cost compared with
Height, and difficulty also is brought to heat energy utilization, therefore general comprising complex components such as sludge dust particles and volatile matters in tail gas
The UTILIZATION OF VESIDUAL HEAT IN of tail gas is not considered in sludge drying engineering, this is also to cause current sludge heating power desiccation energy consumption high
Main cause.
In addition, sludge heating power drying engineering in practice, in discharge bin of the wet mud first through vehicle transport to desiccation factory, material
Wet mud in storehouse passes through pipeline again and is pumped in sludge drying machine.Since wet mud is in paste, poor fluidity, therefore usually deposit
In problem of the pumping resistance greatly with conveying stability difference, this brings significantly not to the normal operation of sludge heating power anhydration system
Benefit influences.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of sludge drying gas waste-heats to utilize sludge viscosity reduction processing dress
It sets, realizes that sludge drying tail gas afterheat recycling improves sludge conveying effect with the processing that cooperates with of sludge mobility, reduction energy consumption is improved
Rate and stability.
It is dirty that the technical solution adopted by the present invention to solve the technical problems is to provide a kind of sludge drying gas waste-heat utilization
Mud viscosity reducing processing unit, including sludge drying machine, sludge carrier pipe, drying tail gas pipeline and spray column, the sludge drying machine
It is connect with sludge carrier pipe, the spray column is connected to sludge drying machine by drying tail gas pipeline, the sludge carrier pipe
Outside is equipped with tube heater, and tail gas heat exchange is equipped on the drying tail gas pipeline between the sludge drying machine and spray column
The heating agent process of device and drying tail gas Jing Guo tail gas heat exchanger, the refrigerant flow path of the tail gas heat exchanger pass through heat-carrying agent respectively
Inlet pipe and heat-carrying agent outlet pipe are connected to form circulation with the heating agent process of tube heater.
The processing unit further includes storage hopper dredger and sludge pump, is conveyed between storage hopper dredger and the sludge drying machine by sludge
Pipe connection, the sludge pump are installed on sludge carrier pipe.
The drying tail gas pipeline at the tail gas heat exchanger both ends is equipped with the bypass pipe arranged side by side with tail gas heat exchanger, the side
Shut-off valve is installed on siphunculus.
The offgas outlet of the spray column is connected to sludge drying machine, the desiccation carrier gas Guan Shangan by desiccation carrier gas pipe
Equipped with air-introduced machine.
Be equipped with vertical convection bank inside the tail gas heat exchanger, the convection bank upper end is connected to upper collecting chamber, under
End is connected to lower header, and the tail gas heat exchanger is vertically installed on drying tail gas pipeline.
The lower header passes through the heating agent tube side outlet of heat-carrying agent outlet pipe and tube heater, and the upper header is logical
It crosses heat-carrying agent inlet pipe to be connected to the heating agent tube-side inlet of tube heater, the heating agent tube-side inlet of the tube heater is located at
Close to one end of sludge drying machine.
The inside of the tail gas heat exchanger, which corresponds to, is equipped with spray equipment above convection bank.
The shell of the tube heater is equipped with insulating layer.
Spaced heat transfer partition is set inside the heating agent shell side of the tube heater.
Beneficial effect
The present invention realizes the collaboration that sludge drying tail gas afterheat is recycled with sludge viscosity reduction and handles, and is exchanged heat using tail gas
Device heat convection recycles the steam latent heat in sludge drying tail gas, and for heating intermediate heat-carrying agent, recycles intermediate heat-carrying
Circulation of the medium between tail gas heat exchanger and tube heater heats sludge transporting pipeline to improve the temperature of wet mud in pipeline
Degree, after sludge temperature rises, sewage sludge viscosity can be remarkably decreased, to reduce the transporting resistance of sludge.Therefore, the present invention one
The waste heat that aspect has recycled drying tail gas recycles, and can reduce the content of water vapour in tail gas, shower water consumption is saved, to wet dirt
Mud has carried out the energy consumption that heating significantly reduces sludge drying, has significant power savings advantages；On the other hand, by adding to sludge
Heat heating improves the mobility of sludge, so that sludge pumping energy consumption declines, and the stability of sludge pumping greatly improved.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the structural schematic diagram of tail gas heat exchanger.
Fig. 3 is the partial sectional view of tube heater.
Fig. 4 is the relational graph between sludge pipeline flow resistance at different temperatures and flow.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
A kind of sludge drying gas waste-heat as shown in Figure 1 utilize sludge viscosity reducing processing unit, including sludge drying machine 1,
Sludge carrier pipe 12, sludge pump 13, storage hopper dredger 14, tube heater 11, drying tail gas pipeline 2, tail gas heat exchanger 3, bypass pipe
4, spray column 6, desiccation carrier gas pipe 7 and air-introduced machine 8.
Sludge drying machine 1 is dry by the directly or indirectly formula heating power of heat-carrying agent of saturated vapor, conduction oil or hot-air
Change machine, wet mud can be heated in sludge drying machine 1, and the water transform in sludge is vapor.Store up hopper dredger 14 and sludge
It is connected between desiccation machine 1 by sludge carrier pipe 12, sludge pump 13 is installed on sludge carrier pipe 12.Sludge drying machine 1 and dirt
Tube heater 11 is installed on the outside of sludge carrier pipe 12 between dredge pump 13.As shown in figure 3, the shell of tube heater 11 is set
There is insulating layer 19, heat losses can be reduced.Spaced heat transfer partition 18 is set inside the heating agent shell side of tube heater 11, is conducted heat
Partition 18 is made of metal material, and can be improved heat transfer efficiency when heat-carrying agent flows in heating agent shell side.
Spray column 6 is connected to sludge drying machine 1 by drying tail gas pipeline 2, between sludge drying machine 1 and spray column 6
Tail gas heat exchanger 3, and heating agent process of the drying tail gas Jing Guo tail gas heat exchanger 3 are installed on drying tail gas pipeline 2.Tail gas heat exchange
The drying tail gas pipeline 2 at 3 both ends of device is equipped with the bypass pipe 4 arranged side by side with tail gas heat exchanger 3, is equipped with shut-off valve on bypass pipe 4
5.In 3 maintenance process of tail gas heat exchanger, the shut-off valve 5 of bypass pipe 4 can be opened, guarantees sludge drying continuous service.
As shown in Fig. 2, being equipped with vertical convection bank 16,16 upper end of convection bank and upper collecting chamber inside tail gas heat exchanger 3
15 connections, lower end are connected to lower header 20, and the top that convection bank 16 is corresponded to inside tail gas heat exchanger 3 is equipped with spray equipment
17.Tail gas heat exchanger 3 is vertically installed on drying tail gas pipeline 2, on the one hand can reduce exhaust gas flow resistance, on the other hand can be subtracted
Adherency of few dust on 16 surface of convection bank.When dust runs up to certain thickness, using spray equipment 17 to convection tube
Beam 16 carries out spray washing.
The offgas outlet of spray column 6 is connected to sludge drying machine 1 by desiccation carrier gas pipe 7, is equipped on desiccation carrier gas pipe 7
Air-introduced machine 8, carrier gas enter the water vapour for carrying sludge drying in drying tail gas pipeline 2 after entering sludge drying machine 1.
The lower header 20 of tail gas heat exchanger 3 is exported by the heating agent tube side of heat-carrying agent outlet pipe 10 and tube heater 11 to be connected
Logical, upper header 15 is connected to by heat-carrying agent inlet pipe 9 with the heating agent tube-side inlet of tube heater 11, the load in convection bank 16
Thermal medium (water or conduction oil) is by the way of above sending next time.The heating agent tube-side inlet of tube heater 11 is located at close to sludge
One end of desiccation machine 1, heat-carrying agent is in the flow direction in tube heater 11 and the sludge conveying side in sludge carrier pipe 12
To opposite.Heat-carrying agent carries out cycle between tail gas heat exchanger 3 and tube heater 11, and convection current is changed in tail gas heat exchanger 3
Heat is dried waste heat from tail gas heating, enters inside tube heater 11 and heats to the sludge in sludge carrier pipe 12.
Practical according to sludge heating power drying engineering, the exhaust temperature flowed out from 1 offgas outlet of sludge drying machine is about 90 DEG C,
In tail gas heat exchanger 3 and after heat-carrying agent heat exchange, heat-carrying media temperature can be promoted to 85 DEG C or so.Heat-carrying agent is right again
Wet mud in sludge carrier pipe 12 is heated, and wet mud temperature can be promoted to 75 DEG C or so.Due to entering sludge drying
Sludge temperature in machine 1 is obviously improved, and desiccation energy consumption can reduce by 15~21%.
Mobility is substantially improved after wet mud heating, and flow resistance of the wet mud in sludge carrier pipe 12 can substantially drop
It is low.As shown in figure 4, the wet mud temperature in sludge carrier pipe 12 is promoted to 61 DEG C from 34 DEG C, then wet mud is conveyed in sludge
Flow resistance in pipe 12 has dropped 47%, viscosity reduction resistance reducing effect highly significant.In addition, sludge drying tail gas is in tail gas heat exchanger
In 3 after heat release, the vapour content in tail gas can reduce 40~60%, can correspondingly save 40~60% spray water consumption.
Claims (9)
1. a kind of sludge drying gas waste-heat utilizes sludge viscosity reducing processing unit, including sludge drying machine (1), sludge carrier pipe
(12), drying tail gas pipeline (2) and spray column (6), the sludge drying machine (1) connect with sludge carrier pipe (12), the spray
Leaching tower (6) is connected to sludge drying machine (1) by drying tail gas pipeline (2), it is characterised in that：The sludge carrier pipe (12)
Outside is equipped with tube heater (11), on the drying tail gas pipeline (2) between the sludge drying machine (1) and spray column (6)
Tail gas heat exchanger (3) is installed and drying tail gas passes through the heating agent process of tail gas heat exchanger (3), the tail gas heat exchanger (3)
Refrigerant flow path passes through heat-carrying agent inlet pipe (9) and heat-carrying agent outlet pipe (10) respectively and the heating agent process of tube heater (11) connects
It is logical to form circulation.
2. a kind of sludge drying gas waste-heat according to claim 1 utilizes sludge viscosity reducing processing unit, it is characterised in that：
The processing unit further includes storage hopper dredger (14) and sludge pump (13), is passed through between the storage hopper dredger (14) and sludge drying machine (1)
Sludge carrier pipe (12) connection, the sludge pump (13) are installed on sludge carrier pipe (12).
3. a kind of sludge drying gas waste-heat according to claim 1 utilizes sludge viscosity reducing processing unit, it is characterised in that：
The drying tail gas pipeline (2) at tail gas heat exchanger (3) both ends is equipped with the bypass pipe (4) arranged side by side with tail gas heat exchanger (3), institute
It states and shut-off valve (5) is installed on bypass pipe (4).
4. a kind of sludge drying gas waste-heat according to claim 1 utilizes sludge viscosity reducing processing unit, it is characterised in that：
The offgas outlet of the spray column (6) is connected to sludge drying machine (1) by desiccation carrier gas pipe (7), the desiccation carrier gas pipe (7)
On air-introduced machine (8) are installed.
5. a kind of sludge drying gas waste-heat according to claim 1 utilizes sludge viscosity reducing processing unit, it is characterised in that：
It is equipped with vertical convection bank (16) inside the tail gas heat exchanger (3), convection bank (16) upper end and upper collecting chamber (15)
Connection, lower end are connected to lower header (20), and the tail gas heat exchanger (3) is vertically installed on drying tail gas pipeline (2).
6. a kind of sludge drying gas waste-heat according to claim 5 utilizes sludge viscosity reducing processing unit, it is characterised in that：
The lower header (20) passes through the heating agent tube side outlet of heat-carrying agent outlet pipe (10) and tube heater (11), the upper collection
Pipe (15) is connected to by heat-carrying agent inlet pipe (9) with the heating agent tube-side inlet of tube heater (11), the tube heater
(11) heating agent tube-side inlet is located at close to the one end of sludge drying machine (1).
7. a kind of sludge drying gas waste-heat according to claim 5 utilizes sludge viscosity reducing processing unit, it is characterised in that：
The inside of the tail gas heat exchanger (3), which corresponds to, is equipped with spray equipment (17) above convection bank (16).
8. a kind of sludge drying gas waste-heat according to claim 1 utilizes sludge viscosity reducing processing unit, it is characterised in that：
The shell of the tube heater (11) is equipped with insulating layer (19).
9. a kind of sludge drying gas waste-heat according to claim 1 utilizes sludge viscosity reducing processing unit, it is characterised in that：
Spaced heat transfer partition (18) is set inside the heating agent shell side of the tube heater (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810876331.XA CN108911467A (en) | 2018-08-03 | 2018-08-03 | Sludge drying gas waste-heat utilizes sludge viscosity reducing processing unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810876331.XA CN108911467A (en) | 2018-08-03 | 2018-08-03 | Sludge drying gas waste-heat utilizes sludge viscosity reducing processing unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108911467A true CN108911467A (en) | 2018-11-30 |
Family
ID=64393263
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810876331.XA Withdrawn CN108911467A (en) | 2018-08-03 | 2018-08-03 | Sludge drying gas waste-heat utilizes sludge viscosity reducing processing unit |
Country Status (1)
| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113087356A (en) * | 2021-03-31 | 2021-07-09 | 华能苏州热电有限责任公司 | Sludge drying system and working method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101274819B1 (en) * | 2012-02-15 | 2013-06-17 | 엄태경 | Dryer of wet sludge and operating method thereof |
| CN103979766A (en) * | 2014-05-26 | 2014-08-13 | 南京理工大学 | Indirect sludge drying tail gas treatment device and treatment method thereof |
| CN107673577A (en) * | 2017-10-27 | 2018-02-09 | 上海城投污水处理有限公司 | Double helix channel-type heat exchanger tube and the glutinous device of sludge heating drop |
| CN208964781U (en) * | 2018-08-03 | 2019-06-11 | 上海城投污水处理有限公司 | Sludge drying gas waste-heat utilizes sludge viscosity reducing processing unit |
-
2018
- 2018-08-03 CN CN201810876331.XA patent/CN108911467A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101274819B1 (en) * | 2012-02-15 | 2013-06-17 | 엄태경 | Dryer of wet sludge and operating method thereof |
| CN103979766A (en) * | 2014-05-26 | 2014-08-13 | 南京理工大学 | Indirect sludge drying tail gas treatment device and treatment method thereof |
| CN107673577A (en) * | 2017-10-27 | 2018-02-09 | 上海城投污水处理有限公司 | Double helix channel-type heat exchanger tube and the glutinous device of sludge heating drop |
| CN208964781U (en) * | 2018-08-03 | 2019-06-11 | 上海城投污水处理有限公司 | Sludge drying gas waste-heat utilizes sludge viscosity reducing processing unit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113087356A (en) * | 2021-03-31 | 2021-07-09 | 华能苏州热电有限责任公司 | Sludge drying system and working method thereof |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181130 |
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