CN105779679A - Direct-reduction ironmaking device and method based on blast furnace slag waste heat utilization - Google Patents
Direct-reduction ironmaking device and method based on blast furnace slag waste heat utilization Download PDFInfo
- Publication number
- CN105779679A CN105779679A CN201610325015.4A CN201610325015A CN105779679A CN 105779679 A CN105779679 A CN 105779679A CN 201610325015 A CN201610325015 A CN 201610325015A CN 105779679 A CN105779679 A CN 105779679A
- Authority
- CN
- China
- Prior art keywords
- blast furnace
- slag
- ore powder
- reduction
- iron ore
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
-
- 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
-
- 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
Abstract
The invention provides a direct-reduction ironmaking device and method based on blast furnace slag waste heat utilization. The device comprises a granulating device and a moving bed reduction device. By means of the device, liquid blast furnace slag is made into high-temperature furnace slag granules, the granules are loaded with a reducing agent and used as a heat carrier to be in direct contact with iron ore powder, and the iron ore powder generates a direct reduction reaction for production and direct-reduction ironmaking. According to the technical scheme, waste heat of the blast furnace slag is adopted as an iron ore powder direct-reduction heat source, the furnace slag heat carrier loaded with the reducing agent is in direct contact with the iron ore powder granules, and therefore efficient heat exchange and mass transfer of the reduction reaction are achieved, the waste heat of the blast furnace slag is efficiently recycled, and low-cost and efficient production of direct-reduced iron is achieved.
Description
Technical field
The present invention relates to energy recovery and utilize field, be specifically related to a kind of direct reduction iron making apparatus and method utilized based on blast furnace slag waste heat.
Background technology
For breaking away from environmental protection requirement, the reduction iron and steel energy consumption that the yoke of development, adaptation are improved by coking coal resource shortage day by day; modern steel commercial development non-blast furnace ironmaking technology of the energy based on noncaking coal; direct-reduction process therein be iron oxides non-fusible, not slag making and in the solid state reduction generate metallic iron product, be the mode of production of a kind of cleaning.But, owing to lacking rational thermal source, make the bottleneck restricting its industrialization large-scale production.
Blast furnace slag is the principal by product of steel manufacture process, and heat content is enriched, and often produces 1 ton of pig iron and wants 0.3～0.6 ton of slag of by-product, and slag per ton about contains (1.26～1.88) × 106The sensible heat of kJ.Waste heat amount contained by slag is high but its taste is relatively low, at present, but without finding effective recovery and utilization ways.Temperature that blast furnace slag has and heat, meet the requirement of direct reduction iron making technique just, provides " freely " energy for it, and effectively solution DRI production cost height restricts a difficult problem for its industrialization.
Patent " blast furnace slag waste heat reclaims and direct-reduction Joint Production system and method " (application number 201510531284.1) discloses the apparatus and method that a kind of blast-furnace cement sensible heat reclaims and utilizes, the method is the gasification utilizing the sensible heat of slag to carry out coal dust, and by coal dust gasification produce rich in H2It is passed into the production carrying out DRI in the middle of reduction shaft furnace with the gas of CO.The method essence is to be undertaken integrated by ripe slag granulating technology, Coal Gasification Technology and coal gas direct reduction processes of Iron ores; the heat making high-temperature slag is cured in coal gas; adopt coal gas as ironmaking reducing agent again; compared with traditional direct reduction processes of Iron ores; select and not innovation in preparation at reducing agent, and there is problems in that
(1) owing to coal gasification is temperature required higher; therefore the method needs to adopt secondary cooling system that granulated slag is cooled down further, and in secondary cooling system, grain slag and air carry out heat exchange; but slag surface is attached to the ash of coal dust gasification residual, affects its heat transfer effect；
(2) reduction shaft furnace is strict to reducing gases component requirements, and coal gasification product gas composition is generally not capable of meeting requirement, it is necessary to additionally increase hydrogenation plant, adds equipment investment and operating cost；
(3) needed for system, reaction unit is more, and equipment is complicated, controls difficulty, and flow process is longer, and slag needs to carry out cooling twice, can cause that sensible heat waste is many, and heat recovery efficiency is not high, power consumption is big.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of direct reduction iron making apparatus and method utilized based on blast furnace slag waste heat, liquid blast furnace is made high temperature furnace slag granule, and load reducing agent, directly contact with Iron Ore Powder as heat carrier and realize efficient Mass and heat transfer, make Iron Ore Powder generation reduction reaction produce direct reduction iron making.The present invention adopts blast furnace slag waste heat as Iron Ore Powder direct-reduction thermal source, and the high efficiente callback both having achieved blast furnace slag waste heat utilizes, and achieves again DRI low cost, produces efficiently.For achieving the above object, the present invention adopts following technical proposals to be achieved:
The present invention provides a kind of direct reduction iron making device utilized based on blast furnace slag waste heat, it is characterised in that: this device includes granulating device and moving bed reduction apparatus；
Described granulating device includes internal layer granulation district and outer layer Iron Ore Powder preheating zone, and granulating device top has liquid blast furnace import, and internal layer granulation top, district is provided with reducing agent sprinkler, and middle part is provided with pelletizing disc, and bottom is provided with granulated slag outlet；Top, outer layer Iron Ore Powder preheating zone has Iron Ore Powder import, is connected with screw feeder, and bottom has preheating Iron Ore Powder outlet and is connected with the preheating Iron Ore Powder import of moving bed reduction reaction device；
Described moving bed reduction reaction device, top is pre-mix zone, and bottom is reducing zone；Described pre-mix zone top is respectively equipped with granulated slag import and reduction offgas outlet；Described reducing zone is the structure that 3 ~ 10 " oval spherical " reduction rooms are connected；
Between granulated slag import and the granulated slag outlet of granulating device of described moving bed reduction reaction device, it is connected each through rotary pocket feeder between preheating Iron Ore Powder outlet and preheating Iron Ore Powder import；Reduced iron product is discharged with reduced iron product exit by slag with granulated slag.
Utilize the direct reduction iron making that said apparatus carries out based on blast furnace slag waste heat utilizes to produce, comprise the following steps:
(1) liquid blast furnace discharged by blast furnace enters pelletizer and is granulated, and sprays reducing agent to slag surface in granulation, after making slag granules area load reducing agent, discharges pelletizer；
(2) the described slag granules of load reducing agent enters in moving bed reduction reaction device, as the Iron Ore Powder Homogeneous phase mixing after heat carrier and preheating, reducing agent under the effect of slag granules heat carrier and iron oxides generation reduction reaction, generates direct-reduction iron product.
Further, after described granulation, slag temperature is 1000 ~ 1200 DEG C.
Further, after described granulation slag size controlling at below 2mm.
Further, described reducing agent is liquid, such as coal tar, domestic waste pyrolysis fuel oil, mud and stalk biomass pyrolysis fuel oil, plastics and tire pyrolysis wet goods.
Further, described reducing agent spray flux is the 60% ~ 100% of slag quality.
Further, described blast furnace slag is 1 ~ 2:1 with Iron Ore Powder input quality ratio.
Comparing traditional direct reduction iron making method and apparatus, the present invention has following advantage:
(1) adopt blast furnace slag waste heat as the thermal source of Iron Ore Powder preheating and Direct Reduction, reduce the production cost of DRI；
(2) mode of heating adopting the slag heat carrier of load reducing agent directly to contact with Iron Ore Powder powder, can significantly improve the Mass and heat transfer efficiency in reduction process；
(3) the by-product tar being difficult by produced in organic solid waste thermochemical study process can be adopted as reducing agent, it is achieved the treatment of wastes with processes of wastes against one another；
(4) on apparatus structure, continuous change due to reduction room diameter of section, slag and the Iron Ore Powder particle swarm kinestate in reduction room is constantly piled up in close phase and is back and forth changed between flowing and discrete motion, and this process can be obviously promoted the Mass and heat transfer in course of reaction；
(5) containing various metals mineral in blast furnace slag, as the catalyst of tar degraded, tar destruction can be promoted, generate more effective reduction components, improve reduction efficiency.
Accompanying drawing explanation
Fig. 1 is process chart
Fig. 2 is based on the device of the direct reduction iron making that blast furnace slag waste heat utilizes
Wherein 1 granulating device；2 moving bed reduction apparatus；3 internal layer granulation districts；4 outer layer Iron Ore Powder preheating zones；5 liquid blast furnace imports；6 reducing agent sprinklers；7 pelletizing discs；8 granulated slag outlets；9 Iron Ore Powder imports；10 screw feeders；11 preheating Iron Ore Powder outlets；12 preheating Iron Ore Powder imports；13 pre-mix zone；14 reducing zones；15 granulated slag imports；16 reduction offgas outlet；17 reduction rooms；18 rotary pocket feeders；19 slags and reduced iron product exit.
Detailed description of the invention
Embodiment 1:
A kind of direct reduction iron making device utilized based on blast furnace slag waste heat, this device includes granulating device 1 and moving bed reduction apparatus 2；Granulating device 1 includes internal layer granulation district 3 and outer layer Iron Ore Powder preheating zone 4, and granulating device 3 top has liquid blast furnace import 5, and internal layer granulation top, district 3 is provided with reducing agent sprinkler 6, and middle part is provided with pelletizing disc 7, and bottom is provided with granulated slag outlet 8；Top, outer layer Iron Ore Powder preheating zone 4 has Iron Ore Powder import 9, is connected with screw feeder 10, and bottom has preheating Iron Ore Powder outlet 11 and is connected 12 with the preheating Iron Ore Powder import of moving bed reduction reaction device 2；
Moving bed reduction reaction device 2 top is pre-mix zone 13, and bottom is reducing zone 14；Described pre-mix zone 13 top is respectively equipped with granulated slag import 15 and reduction offgas outlet 16；Described reducing zone 14 is the structure that 3 ~ 10 " oval spherical " reduction rooms 17 are connected；
Between granulated slag import 15 and the granulated slag outlet 8 of granulating device 1 of moving bed reduction reaction device 2,11 preheating Iron Ore Powder outlets preheat with 12 and are connected each through rotary pocket feeder 18 between Iron Ore Powder import；Reduced iron product is discharged by slag and reduced iron product exit 19 with granulated slag.
A kind of method of direct reduction iron making utilized based on blast furnace slag waste heat described in the present embodiment, comprises the following steps:
(1) liquid blast furnace discharged by blast furnace enters pelletizer and is granulated; granulation sprays domestic waste pyrolysis fuel oil to slag surface according to the 60% of slag quality; the granulated slag temperature of the area load domestic waste pyrolysis fuel oil generated is 1000 DEG C; below particle diameter 2mm, discharges pelletizer；
(2) the described slag granules of load domestic waste pyrolysis fuel oil enters in moving bed reduction reaction device, as the Iron Ore Powder after heat carrier and preheating according to slag and Iron Ore Powder mass ratio 1:1 Homogeneous phase mixing, domestic waste pyrolysis fuel oil is under the effect of slag granules heat carrier and iron oxides generation reduction reaction, after vibrosieve separates with slag granules, generate DRI.
Use the assay method of the DRI product metal rate of (GB/T24236-2009) defined, direct-reduction iron product is detected, records degree of metalization and reach 90.2%, can as the quality raw materials of electric furnace steel making.
Example 2:
A kind of method of direct reduction iron making utilized based on blast furnace slag waste heat described in the present embodiment, comprises the following steps:
(1) liquid blast furnace discharged by blast furnace is divided into, through slag runner, the slag stream that multiply diameter is 10mm; enter pelletizer to be granulated; granulation sprays plastic cracking oil to slag surface according to the 100% of slag quality; the granulated slag temperature of the area load domestic waste pyrolysis fuel oil generated is 1200 DEG C; below particle diameter 2mm, discharges pelletizer；
(2) the described slag granules of loaded plastics cracked oil enters in moving bed reduction reaction device, as the Iron Ore Powder after heat carrier and preheating according to slag and Iron Ore Powder mass ratio 2:1 Homogeneous phase mixing, plastic cracking oil is under the effect of slag granules heat carrier and iron oxides generation reduction reaction, after vibrosieve separates with slag granules, generate DRI.
Use the assay method of the DRI product metal rate of (GB/T24236-2009) defined, direct-reduction iron product is detected, records degree of metalization and reach 93.7%, can as the quality raw materials of electric furnace steel making.
Above example is only in order to illustrate technical scheme, but not is limited；Although the present invention being described in detail with reference to previous embodiment, for the person of ordinary skill of the art, still the technical scheme described in previous embodiment can be modified, or wherein portion of techniques feature is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of present invention technical scheme required for protection.
Claims (6)
1. the direct reduction iron making apparatus and method utilized based on blast furnace slag waste heat, it is characterised in that the method adopts following device, including granulating device and moving bed reduction apparatus；
Described granulating device includes internal layer granulation district and outer layer Iron Ore Powder preheating zone, and granulating device top has liquid blast furnace import, and internal layer granulation top, district is provided with reducing agent sprinkler, and middle part is provided with pelletizing disc, and bottom is provided with granulated slag outlet；Top, outer layer Iron Ore Powder preheating zone has Iron Ore Powder import, is connected with screw feeder, and bottom has preheating Iron Ore Powder outlet and is connected with the preheating Iron Ore Powder import of moving bed reduction reaction device；
Described moving bed reduction reaction device, top is pre-mix zone, and bottom is reducing zone；Described pre-mix zone top is respectively equipped with granulated slag import and reduction offgas outlet；Described reducing zone is the structure that 3 ~ 10 " oval spherical " reduction rooms are connected；
Between granulated slag import and the granulated slag outlet of granulating device of described moving bed reduction reaction device, it is connected each through rotary pocket feeder between preheating Iron Ore Powder outlet and preheating Iron Ore Powder import；
Utilize the direct reduction iron making that said apparatus carries out based on blast furnace slag waste heat utilizes to produce, comprise the following steps:
(1) liquid blast furnace discharged by blast furnace enters pelletizer and is granulated, and sprays reducing agent to slag surface in granulation, after making slag granules area load reducing agent, discharges pelletizer；
(2) the described slag granules of load reducing agent enters in moving bed reduction reaction device, as the Iron Ore Powder Homogeneous phase mixing after heat carrier and preheating, reducing agent under the effect of slag granules heat carrier and iron oxides generation reduction reaction, generates direct-reduction iron product.
2. a kind of direct reduction iron making apparatus and method utilized based on blast furnace slag waste heat according to claim 1, it is characterised in that after described granulation, slag temperature is 1000 ~ 1200 DEG C.
3. a kind of direct reduction iron making apparatus and method utilized based on blast furnace slag waste heat according to claim 1, it is characterised in that after described granulation, slag size controlling is at below 2mm.
4. a kind of direct reduction iron making apparatus and method utilized based on blast furnace slag waste heat according to claim 1, it is characterized in that, described reducing agent is liquid, such as coal tar, domestic waste pyrolysis fuel oil, mud and stalk biomass pyrolysis fuel oil, plastics and tire pyrolysis wet goods.
5. a kind of direct reduction iron making apparatus and method utilized based on blast furnace slag waste heat according to claim 1, it is characterised in that described reducing agent spray flux is the 60% ~ 100% of slag quality.
6. a kind of direct reduction iron making apparatus and method utilized based on blast furnace slag waste heat according to claim 1, it is characterised in that described blast furnace slag is 1 ~ 2:1 with Iron Ore Powder input quality ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610325015.4A CN105779679B (en) | 2016-05-17 | 2016-05-17 | A kind of direct reduction iron making apparatus and method utilized based on blast furnace slag waste heat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610325015.4A CN105779679B (en) | 2016-05-17 | 2016-05-17 | A kind of direct reduction iron making apparatus and method utilized based on blast furnace slag waste heat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105779679A true CN105779679A (en) | 2016-07-20 |
| CN105779679B CN105779679B (en) | 2018-01-09 |
Family
ID=56378814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610325015.4A Active CN105779679B (en) | 2016-05-17 | 2016-05-17 | A kind of direct reduction iron making apparatus and method utilized based on blast furnace slag waste heat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105779679B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110241355A (en) * | 2018-03-08 | 2019-09-17 | 盐城市鑫洋电热材料有限公司 | A kind of ferrochrome prepared with chromite |
| CN110241314A (en) * | 2018-03-08 | 2019-09-17 | 盐城市鑫洋电热材料有限公司 | A method of ferrochrome is prepared with chromite |
| CN111961783A (en) * | 2020-07-29 | 2020-11-20 | 辽宁科技大学 | Sponge iron production system and production process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705325A (en) * | 2009-12-10 | 2010-05-12 | 重庆瑞源环境工程有限公司 | Method for producing sponge iron and recycling nonferrous metals simultaneously by utilizing metallurgy waste materials |
| CN102277461A (en) * | 2011-08-17 | 2011-12-14 | 北京科技大学 | Method for directly restoring industrial waste residue through rotary hearth furnace |
| CN102329911A (en) * | 2011-09-13 | 2012-01-25 | 唐山奥特斯科技有限公司 | Process for manufacturing iron pellets from low-grade complex refractory ore through molten slag method |
| CN102363218A (en) * | 2011-11-25 | 2012-02-29 | 北京君致清科技有限公司 | Method for producing copper-powder-containing iron by reducing copper-containing furnace cinders directly |
| CN105087844A (en) * | 2015-08-26 | 2015-11-25 | 中冶南方工程技术有限公司 | Blast furnace slag waste heat recovery and direct reduction joint production system and method |
-
2016
- 2016-05-17 CN CN201610325015.4A patent/CN105779679B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705325A (en) * | 2009-12-10 | 2010-05-12 | 重庆瑞源环境工程有限公司 | Method for producing sponge iron and recycling nonferrous metals simultaneously by utilizing metallurgy waste materials |
| CN102277461A (en) * | 2011-08-17 | 2011-12-14 | 北京科技大学 | Method for directly restoring industrial waste residue through rotary hearth furnace |
| CN102329911A (en) * | 2011-09-13 | 2012-01-25 | 唐山奥特斯科技有限公司 | Process for manufacturing iron pellets from low-grade complex refractory ore through molten slag method |
| CN102363218A (en) * | 2011-11-25 | 2012-02-29 | 北京君致清科技有限公司 | Method for producing copper-powder-containing iron by reducing copper-containing furnace cinders directly |
| CN105087844A (en) * | 2015-08-26 | 2015-11-25 | 中冶南方工程技术有限公司 | Blast furnace slag waste heat recovery and direct reduction joint production system and method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110241355A (en) * | 2018-03-08 | 2019-09-17 | 盐城市鑫洋电热材料有限公司 | A kind of ferrochrome prepared with chromite |
| CN110241314A (en) * | 2018-03-08 | 2019-09-17 | 盐城市鑫洋电热材料有限公司 | A method of ferrochrome is prepared with chromite |
| CN110241355B (en) * | 2018-03-08 | 2020-09-08 | 盐城市鑫洋电热材料有限公司 | Ferrochromium alloy prepared from chromite |
| CN111961783A (en) * | 2020-07-29 | 2020-11-20 | 辽宁科技大学 | Sponge iron production system and production process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105779679B (en) | 2018-01-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104212930B (en) | A kind of BAOSHEREX iron-smelting process of two-step smelting molten iron | |
| WO2021115029A1 (en) | Iron-containing metallurgical slag granule graded waste heat recovery and direct reduction system and method | |
| CN103667571B (en) | System and method of fluidized direct reduction of iron ore concentrate powder | |
| WO2021035815A1 (en) | Electric energy full-hydrogen flash reduction direct steelmaking system and process | |
| CN101522920B (en) | Apparatus for manufacturing molten irons and method for manufacturing molten irons using the same | |
| CN110438277B (en) | Cyclone flash reduction direct steelmaking system and process | |
| CN104404189B (en) | Utilize the method that chromite powder two-step method melting and reducing produces ferrochrome | |
| CN103272536A (en) | Composite bed reactor and method for combined production of calcium carbide, gas and tar | |
| CN102010924B (en) | Method for producing directly reduced iron from coal | |
| CN105296699B (en) | It is a kind of to avoid the fused reduction iron-smelting device and method that prereduction ore deposit is reoxidized | |
| CN105087844B (en) | Blast furnace slag waste heat recovery and direct reduction joint production system and method | |
| CN101104873A (en) | Method for fusing reducing iron by employing iron ore hot pressing carbon-containing agglomerate | |
| CN105668568A (en) | System and method for production of calcium carbide | |
| CN103992822A (en) | Catalytic gasification method and device | |
| CN203360394U (en) | Coal gasification device utilizing waste heat of high-temperature molten slag | |
| CN105779679A (en) | Direct-reduction ironmaking device and method based on blast furnace slag waste heat utilization | |
| CN104593085A (en) | Coal gasifier for slag granulation and coal gas preparation process | |
| CN107091569A (en) | Rotary kiln and the polygenerations systeme that metal hydride is produced using the rotary kiln | |
| CN102826508A (en) | Method for preparing hydrogen by utilizing metallurgical slag waste heat to reform regenerative resources rich in methane | |
| CN111187871A (en) | Production system and method for direct reduced iron | |
| CN214694260U (en) | Direct smelting process device for iron-containing zinc-containing solid waste in iron and steel plant | |
| CN102268502A (en) | Spongy iron preparation method by smelting refractory iron ore (slag) with reduction rotary kiln | |
| CN104192799B (en) | High-temperature metallurgical slag particulate catalytic gasified bio-matter produces hydrogen-rich gas device and method | |
| CN105779017A (en) | Junked-tire fluidized gasification device and junked-tire fluidized gasification method based on blast furnace slag waste heat utilization | |
| CN101570699A (en) | Gasification device for solid fuel and method for producing synthetic gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181219 Address after: 266011 Xueyuan Hotel, No. 18 Fushun Road, North District, Qingdao City, Shandong Province Patentee after: Guangda Institute of Environmental Technology (Qingdao) Co., Ltd. Address before: 266520 No. 777 Jialingjiang Road, Huangdao District, Qingdao City, Shandong Province Patentee before: Qingdao Technological University |
|
| TR01 | Transfer of patent right |