CN103922333B - The oxygen carbonization pretreatment system prepared for active carbon from coal - Google Patents
The oxygen carbonization pretreatment system prepared for active carbon from coal Download PDFInfo
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- CN103922333B CN103922333B CN201410178114.5A CN201410178114A CN103922333B CN 103922333 B CN103922333 B CN 103922333B CN 201410178114 A CN201410178114 A CN 201410178114A CN 103922333 B CN103922333 B CN 103922333B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000003245 coal Substances 0.000 title claims abstract description 36
- 238000003763 carbonization Methods 0.000 title claims abstract description 28
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 15
- 239000001301 oxygen Substances 0.000 title claims abstract description 15
- 230000003647 oxidation Effects 0.000 claims abstract description 66
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 66
- 239000007789 gas Substances 0.000 claims abstract description 26
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003546 flue gas Substances 0.000 claims abstract description 19
- 150000001875 compounds Chemical class 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 239000000428 dust Substances 0.000 claims abstract description 13
- 238000000746 purification Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 12
- 239000000470 constituent Substances 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 8
- 230000004913 activation Effects 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000005539 carbonized material Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000001179 sorption measurement Methods 0.000 abstract description 9
- 238000009776 industrial production Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000002203 pretreatment Methods 0.000 description 3
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- 230000000274 adsorptive effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011630 iodine Substances 0.000 description 2
- 229910052740 iodine Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000011269 tar Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011294 coal tar pitch Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 229930195735 unsaturated hydrocarbon Natural products 0.000 description 1
Classifications
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention discloses a kind of oxygen carbonization pretreatment system prepared for active carbon from coal, including external-heat oxidation furnace, external-heat retort, cooling stove；The exhanst gas outlet of external-heat oxidation furnace is connected with flue gas purification system, the oxidized tail gas outlet of external-heat oxidation furnace is connected with dust arrester, the discharge of dust arrester is connected with described compound stalk forming system, the oxidized tail gas outlet of dust arrester is connected with incinerator, and the high-temperature flue gas outlet of incinerator is connected respectively with described external-heat oxidation furnace and external-heat retort；The exhanst gas outlet of external-heat retort is connected with described flue gas purification system through heat exchanger, and the carbonization offgas outlet of external-heat retort is connected with described incinerator, and the high temperature air outlet of described heat exchanger is connected respectively with described external-heat oxidation furnace and incinerator.Adsorption rate and the product yield that can realize activated carbon goods under large-scale industrial production are all improved, and are capable of saving the energy, reduce production cost.
Description
Technical field
The present invention relates to a kind of coal chemical technology, particularly relate to a kind of oxygen carbonization pretreatment system prepared for active carbon from coal
System.
Background technology
Activated carbon is a kind of porous carbon material, has abundant pore structure and huge specific surface area, is widely used
In adsorbing, separate, be catalyzed and the numerous areas such as electronics, process and in terms of gas treatment at environmental conservation water especially, activity
Carbonaceous material is the multiple pollutant that can simultaneously remove in flue gas for the feature of gas cleaning, such as SO2, NOx, flue dust grain
Son, hydrargyrum, two English, bark mutter, heavy metal, volatile organic matter and other trace element etc..
The technique using compound stalk forming legal system to make ature of coal granular active carbon originates from America and Europe, from phase earlier 1990s
Starting, be increasingly becoming the focus of China's coal mass active carbon industry, domestic several professional production lines existing put into operation.But Europe
In the similar production line of man of the U.S., common oxidation operation is the most then cancelled.
More than ten years recently, the pre-oxidation treatment of raw coal causes activated carbon work to the impact of its end article Properties of Activated Carbon
The very big concern of person, test at present shows, selecting datong bitumite and coal tar pitch is raw material, uses compound stalk forming legal system
Make ature of coal granular active carbon.When other process conditions of preparation process are identical, oxidation pre-treatment can make final activated carbon system
The water capacity of product, iodine sorption value, serge blue adsorptive value and carbon tetrachloride adsorption rate are respectively increased 27～34%,
134mg/g, 86～96mg/g and 9～13.5% (absolute arithmetic difference)；When the performance controlling end article is water capacity
106～119%, iodine sorption value ＞ 1050mg/g, serge blue adsorptive value ＞ 225mg/g, carbon tetrachloride adsorption rate 67～
When 75%, oxidation pre-treatment can make the product yield of activation procedure improve more than 10%.No matter to the absorption property of goods also
Being the yield to product, oxidation pre-treatment is all absolute advantage (volume 28 the 1st " coal conversion " in January, 2005
Phase).To such an extent as to having people to foretell, following coal mass active carbon typical manufacturing process will be by oxidation, carbonization, three masters of activation
Link is wanted to constitute.
At present, energy-conserving and environment-protective have become the inevitable requirement of Sustainable Socioeconomic Development, country's control to pollutant emission
Dynamics is strengthened day by day, increasing to the demand of activated carbon, but the Activated Carbon Production of extensive high-quality lacks the most very much.This
Invention considers feature and the pluses and minuses of external Activated Carbon Production technology of domestic coal resources, on the basis that carbonization processes
On, propose to pass through oxidation technology, it is achieved improve adsorption rate and the requirement of product yield of activated carbon goods, and realize big rule
Mould industrialized production.
Summary of the invention
It is an object of the invention to provide a kind of efficient, economic oxygen carbonization pretreatment system prepared for active carbon from coal,
Adsorption rate and the product yield that can realize activated carbon goods under large-scale industrial production are all improved, and are capable of joint
The about energy, reduces production cost.
It is an object of the invention to be achieved through the following technical solutions:
The oxygen carbonization pretreatment system prepared for active carbon from coal of the present invention, including external-heat oxidation furnace, described exterior-heat
The coal base molded material charging aperture of formula oxidation furnace is connected with compound stalk forming system, the oxidation material discharging opening of described external-heat oxidation furnace
Being connected with the charging aperture of external-heat retort, the carbonized material discharging opening of described external-heat retort connects with the charging aperture of cooling stove
Connecing, the discharging opening of described cooling stove is connected with activation system；
The exhanst gas outlet of described external-heat oxidation furnace is connected with flue gas purification system, the oxidized tail gas of described external-heat oxidation furnace
Outlet is connected with dust arrester, and the discharge of described dust arrester is connected with described compound stalk forming system, and described dedusting fills
The oxidized tail gas outlet put is connected with incinerator, the outlet of the high-temperature flue gas of described incinerator and described external-heat oxidation furnace and outward
Hot type retort connects respectively；
The exhanst gas outlet of described external-heat retort is connected with described flue gas purification system through heat exchanger, described external-heat carbonization
The carbonization offgas outlet of stove is connected with described incinerator, high temperature air outlet and the described external-heat oxidation furnace of described heat exchanger
Connect respectively with incinerator.
As seen from the above technical solution provided by the invention, what the embodiment of the present invention provided prepares for active carbon from coal
Oxygen carbonization pretreatment system, owing to including external-heat oxidation furnace, the coal base molded material charging aperture of external-heat oxidation furnace and pressure
Formation of lots system connects, and the oxidation material discharging opening of external-heat oxidation furnace is connected with the charging aperture of external-heat retort, external-heat
The carbonized material discharging opening of retort is connected with the charging aperture of cooling stove, and the discharging opening of cooling stove is connected with activation system；Exterior-heat
The exhanst gas outlet of formula oxidation furnace is connected with flue gas purification system, and the oxidized tail gas outlet of external-heat oxidation furnace is with dust arrester even
Connecing, the discharge of dust arrester is connected with described compound stalk forming system, the oxidized tail gas outlet of dust arrester and incinerator
Connecting, the high-temperature flue gas outlet of incinerator is connected respectively with described external-heat oxidation furnace and external-heat retort；External-heat charcoal
The exhanst gas outlet changing stove is connected with described flue gas purification system through heat exchanger, the carbonization offgas outlet of external-heat retort and institute
Stating incinerator to connect, the high temperature air outlet of described heat exchanger is connected respectively with described external-heat oxidation furnace and incinerator.Energy
The adsorption rate and the product yield that realize activated carbon goods under large-scale industrial production are all improved, and are capable of saving
The energy, reduces production cost.
Accompanying drawing explanation
The structural representation of the oxygen carbonization pretreatment system prepared for active carbon from coal that Fig. 1 provides for the embodiment of the present invention.
Detailed description of the invention
The embodiment of the present invention will be described in further detail below.
The oxygen carbonization pretreatment system prepared for active carbon from coal of the present invention, its preferably detailed description of the invention is:
Including external-heat oxidation furnace, the coal base molded material charging aperture of described external-heat oxidation furnace is connected with compound stalk forming system,
The oxidation material discharging opening of described external-heat oxidation furnace is connected with the charging aperture of external-heat retort, described external-heat retort
Carbonized material discharging opening is connected with the charging aperture of cooling stove, and the discharging opening of described cooling stove is connected with activation system；
The exhanst gas outlet of described external-heat oxidation furnace is connected with flue gas purification system, the oxidized tail gas of described external-heat oxidation furnace
Outlet is connected with dust arrester, and the discharge of described dust arrester is connected with described compound stalk forming system, and described dedusting fills
The oxidized tail gas outlet put is connected with incinerator, the outlet of the high-temperature flue gas of described incinerator and described external-heat oxidation furnace and outward
Hot type retort connects respectively；
The exhanst gas outlet of described external-heat retort is connected with described flue gas purification system through heat exchanger, described external-heat carbonization
The carbonization offgas outlet of stove is connected with described incinerator, high temperature air outlet and the described external-heat oxidation furnace of described heat exchanger
Connect respectively with incinerator.
Described external-heat oxidation furnace and external-heat retort are respectively external-heating rotary kiln, set inside described external-heating rotary kiln
Put flight, and use zone heating.
Described cooling stove is provided with desalted water cooling system.
The fugitive constituent of the base molded material of described coal be 30～40%, moisture≤2%, hardness >=90%, particle size distribution be
3.35～0.60mm, bulk specific weight is 650～750kg/m3, temperature be room temperature.
In described external-heat oxidation furnace, heated after surrounding air material base molded to described coal be dried, remove pressure
Moisture in formation of lots material and part fugitive constituent, and the surface of material base molded to described coal aoxidizes.
In described external-heat retort, the oxidation material that described external-heat oxidation furnace prepares is made semicoke, fugitive constituent is dropped
As little as 15.0～22.0%, tar yield≤2%, hardness >=90%, particle size distribution 3.35～0.425mm.
It is an advantage of the current invention that: (1) can realize large-scale industrial production, reduce production cost, improve and produce effect
Rate；(2) oxidation technology is conducive to improving adsorption rate and the product yield of activated carbon goods；(3) have employed low cost
Air is as oxidant, the most cost-effective；(4) set the external-heating rotary kiln of flight in using, reduce product
Breakage, improves productivity；(5) using zone heating, temperature of charge is approximately linear distribution in kiln；(6) for outward
The shortcoming that the heating revolving kiln thermal efficiency is low, uses circulation heating mode, improves energy utilization rate, reduce and run into
This.
Specific embodiment:
As it is shown in figure 1, compound stalk forming material is coal compound stalk forming material, fugitive constituent 30～40%, moisture≤2%, hardness >=
90%, particle size distribution 3.35～0.60mm, bulk specific weight 650～750kg/m3, temperature room temperature, treating capacity is 20,000
Ton/year.Molding mass comes in contact with the oxidation air (about 250 DEG C) preheated in oxidation furnace, acts primarily as and is dried and oxidation work
With, remove the moisture in compound stalk forming material and part fugitive constituent, and molding mass surface aoxidized, form oxidation material,
Wherein volatile content is for for 28～38%, hardness >=90%, particle size distribution 3.35～0.425mm, bulk specific weight
650～750kg/m3, temperature about 200～300 DEG C.The oxidation material of oxidation furnace output is sent directly into carbonization through bucket chain conveyor
Stove, isolation air is thermally formed coke, and wherein volatile content is 15.0～22.0%, tar yield≤2%, hardness >=
90%, particle size distribution 3.35～0.425mm, bulk specific weight is 650～750kg/m3, temperature about 500～600 DEG C,
Furnace pressure is 100Pa ± 20Pa.The carbonized material of retort output is directly entered chilling roll, is cooled to by desalted water
It is delivered to activation system after 150 DEG C and carries out the preparation of activated carbon.
In oxidation furnace, oxidation air and the base molded material of coal define oxidized tail gas after reacting, and are mainly composed of air, contain
Having coal dust, a little fugitive constituent and moisture, the oxidized tail gas after removing dust is sent into incinerator and is burned, the coal dust warp of collection
Air conveying recycle to compound stalk forming system.Oxidation material generates carbonization tail gas through airtight heating in retort, main
Wanting composition is CH4And homologue, also H2、CO2, CO and unsaturated hydrocarbons, calorific value >=6000kCal/Nm3, directly
Feeding incinerator burns, and the high-temperature flue gas of generation is used for oxidation furnace and the heat source of retort.
What retort was discharged add after heat smoke carries out heat exchange with oxidation air in heat exchanger, the heating cigarette discharged with oxidation furnace
Flue gas purification system is together entered after gas mixing.Flue gas after purification meets emptying after pollutant emission standard requires.
Oxidation air after preheating is partly into oxidation furnace and aoxidizes compound stalk forming material, and another part enters incinerator
As combustion air.
It it is exactly more than lower-grade metamorphic bituminous implementation process in the present embodiment.
In sum, after the coal base oxidized pretreatment of compound stalk forming material in the present embodiment, eliminate plasticity and dilatancy,
And make the original void of closing be gradually opened, it is thus achieved that flourishing initial void structure, then after carbonization processes, it is thus achieved that more
Big porosity, so that the adsorptivity prepared of activated carbon and product yield obtain and improve.
Heating system uses zone heating and the mode of circulation heating, thus obtains good while ensureing to save energy and reduce the cost
Temperature case.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope of present disclosure, the change that can readily occur in or replace
Change, all should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be with claims
Protection domain is as the criterion.
Claims (6)
1. the oxygen carbonization pretreatment system prepared for active carbon from coal, it is characterised in that include that external-heat aoxidizes
Stove, the coal base molded material charging aperture of described external-heat oxidation furnace is connected with compound stalk forming system, described external-heat oxidation furnace
Oxidation material discharging opening is connected with the charging aperture of external-heat retort, the carbonized material discharging opening of described external-heat retort and cooling
The charging aperture of stove connects, and the discharging opening of described cooling stove is connected with activation system；
The exhanst gas outlet of described external-heat oxidation furnace is connected with flue gas purification system, the oxidized tail gas of described external-heat oxidation furnace
Outlet is connected with dust arrester, and the discharge of described dust arrester is connected with described compound stalk forming system, and described dedusting fills
The oxidized tail gas outlet put is connected with incinerator, the outlet of the high-temperature flue gas of described incinerator and described external-heat oxidation furnace and outward
Hot type retort connects respectively；
The exhanst gas outlet of described external-heat retort is connected with described flue gas purification system through heat exchanger, described external-heat carbonization
The carbonization offgas outlet of stove is connected with described incinerator, high temperature air outlet and the described external-heat oxidation furnace of described heat exchanger
Connect respectively with incinerator.
The oxygen carbonization pretreatment system prepared for active carbon from coal the most according to claim 1, it is characterised in that
Described external-heat oxidation furnace and external-heat retort are respectively external-heating rotary kiln, and internal setting of described external-heating rotary kiln is copied
Plate, and use zone heating.
The oxygen carbonization pretreatment system prepared for active carbon from coal the most according to claim 2, it is characterised in that
Described cooling stove is provided with desalted water cooling system.
4. according to the oxygen carbonization pretreatment system prepared for active carbon from coal described in claim 1,2 or 3, its feature
Be, the fugitive constituent of the base molded material of described coal be 30～40%, moisture≤2%, hardness >=90%, particle size distribution be
3.35～0.60mm, bulk specific weight is 650～750kg/m3, temperature be room temperature.
The oxygen carbonization pretreatment system prepared for active carbon from coal the most according to claim 4, it is characterised in that
In described external-heat oxidation furnace, heated after surrounding air material base molded to described coal be dried, remove briquetting become
Moisture in moulding mixture and part fugitive constituent, and the surface of material base molded to described coal aoxidizes.
The oxygen carbonization pretreatment system prepared for active carbon from coal the most according to claim 5, it is characterised in that
In described external-heat retort, the oxidation material that described external-heat oxidation furnace prepares is made semicoke, fugitive constituent is reduced to
15.0～22.0%, tar yield≤2%, hardness >=90%, particle size distribution 3.35～0.425mm.
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| CN201410178114.5A CN103922333B (en) | 2014-04-29 | 2014-04-29 | The oxygen carbonization pretreatment system prepared for active carbon from coal |
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| CN201410178114.5A CN103922333B (en) | 2014-04-29 | 2014-04-29 | The oxygen carbonization pretreatment system prepared for active carbon from coal |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104315524B (en) * | 2014-09-11 | 2016-06-29 | 中复神鹰碳纤维有限责任公司 | A kind of carbon fiber low-temperature carbonization exhaust treatment system |
| CN105645407A (en) * | 2016-03-15 | 2016-06-08 | 湖南丽农麻业生物科技有限公司 | Method and system for preparing activated carbon by industrial hemp poles through external heating type carbonization method |
| CN105883802B (en) * | 2016-03-31 | 2019-01-11 | 神华集团有限责任公司 | A kind of active carbon from coal preparation method based on external heat type rotary furnace charing |
| CN106517194A (en) * | 2016-12-08 | 2017-03-22 | 北京神雾环境能源科技集团股份有限公司 | System and method for preparing activated carbon by aid of pyrolyzing furnace and multistage furnace |
| CN106517180B (en) * | 2016-12-08 | 2019-03-05 | 神雾科技集团股份有限公司 | A kind of system and method preparing active carbon |
| CN109734093B (en) * | 2019-03-07 | 2020-07-28 | 大同新成新材料股份有限公司 | Oxidation carbomorphism device of coal base activated carbon |
| CN115367746B (en) * | 2022-09-02 | 2023-11-17 | 安徽科达锂电装备有限公司 | Continuous granulating/pre-carbonizing method and preparation method of graphite anode material |
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| CN102153079A (en) * | 2011-05-03 | 2011-08-17 | 北京华福神雾工业炉有限公司 | Method and system for preparing active carbon from industrial coal by using oxygen carbonization method |
| CN203295333U (en) * | 2013-03-28 | 2013-11-20 | 上海中发环保(集团)有限公司 | External heated sludge carbonizing kiln |
| CN203866039U (en) * | 2014-04-29 | 2014-10-08 | 北京华福神雾工业炉有限公司 | Oxidizing and carbonizing pretreatment system for preparing coal-based activated carbon |
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2014
- 2014-04-29 CN CN201410178114.5A patent/CN103922333B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812309A (en) * | 2010-04-20 | 2010-08-25 | 西安三瑞实业有限公司 | Method for preparing coal-based carbonized material used for preparing active carbon |
| CN102153079A (en) * | 2011-05-03 | 2011-08-17 | 北京华福神雾工业炉有限公司 | Method and system for preparing active carbon from industrial coal by using oxygen carbonization method |
| CN203295333U (en) * | 2013-03-28 | 2013-11-20 | 上海中发环保(集团)有限公司 | External heated sludge carbonizing kiln |
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Inventor after: Qi Jingzhi Inventor after: Jue Zhijian Inventor after: Ma Weiyuan Inventor after: Gao Jing Inventor after: Bai Zhiguo Inventor after: Chen Yishi Inventor after: Yue Yunfei Inventor before: Qi Jingzhi Inventor before: Ma Weiyuan Inventor before: Yue Yunfei |
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