CN109237936A - A kind of rotary kiln of high-efficiency environment friendly - Google Patents
A kind of rotary kiln of high-efficiency environment friendly Download PDFInfo
- Publication number
- CN109237936A CN109237936A CN201811387099.XA CN201811387099A CN109237936A CN 109237936 A CN109237936 A CN 109237936A CN 201811387099 A CN201811387099 A CN 201811387099A CN 109237936 A CN109237936 A CN 109237936A
- Authority
- CN
- China
- Prior art keywords
- outer cylinder
- inner cylinder
- kiln
- rotary kiln
- combustion chamber
- 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.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 239000000428 dust Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- 239000003546 flue gas Substances 0.000 description 9
- 238000000605 extraction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 235000019504 cigarettes Nutrition 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 210000000038 chest Anatomy 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000012716 precipitator Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000009856 non-ferrous metallurgy Methods 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
- F27B7/22—Rotary drums; Supports therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
- F27B7/34—Arrangements of heating devices
-
- 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
- F27D17/10—Arrangements for using 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
本发明涉及回转窑设备领域，公开了一种热能效率高的回转窑，所述回转窑包括窑体、窑头罩和窑尾罩，所述窑体为套筒结构，包括同轴固定设置的外筒、内筒以及位于外筒与内筒之间的燃烧室；所述外筒与内筒之间通过管道相互支撑连接，并通过管道将外筒的物料输送至内筒；靠近所述窑体一端的外筒上设有进料口，靠近所述窑体另一端的外筒以及内筒上分别设有外筒出料口和内筒出料口；所述燃烧室的两端分别设有连接气源的进气管以及排放废气的出气管，并在所述进气管与出气管之间设有热交换装置。The invention relates to the field of rotary kiln equipment, and discloses a rotary kiln with high thermal energy efficiency. The rotary kiln comprises a kiln body, a kiln head cover and a kiln tail cover. An outer cylinder, an inner cylinder and a combustion chamber located between the outer cylinder and the inner cylinder; the outer cylinder and the inner cylinder are supported and connected to each other through pipes, and the materials of the outer cylinder are transported to the inner cylinder through the pipes; close to the kiln The outer cylinder at one end of the kiln body is provided with a feeding port, and the outer cylinder and the inner cylinder near the other end of the kiln body are respectively provided with an outer cylinder discharge port and an inner cylinder discharge port; the two ends of the combustion chamber are respectively provided with There is an air inlet pipe connected to the air source and an air outlet pipe for discharging exhaust gas, and a heat exchange device is arranged between the air inlet pipe and the air outlet pipe.
Description
Technical field
The present invention relates to rotary kiln device fields, more particularly, to a kind of rotary kiln that heat energy efficiency is high.
Background technique
Rotary kiln is the Thermal Equipment heated to bulk or pasty material, be widely used in nonferrous metallurgy,
The industrial departments such as iron and steel industry, refractory material, cement, chemical industry and papermaking.Rotary kiln generally includes kiln body, kiln head cover and kiln tail
Cover, in revolution, material is axially moveable while circumferentially rolling in kiln, and burner sprays into fuel, cigarette in kiln body one end
Gas is discharged by the other end, and material is heated in moving process, from low after physically or chemically changing as qualified products
End is drawn off, the generally existing following problems of rotary kiln traditional at present:
1. poor fluidity of the material in rotary kiln, a large amount of materials are made since gravity is deposited in rotary kiln bottom for a long time
Even at material uneven heating, energy consumption is high, time-consuming, low output, the qualification rate of product is low, material waste is serious.
2. during rotary kiln heated material, material to be machined and burning are run in same kiln thorax, the nuisance in fuel
Matter be attached to be calcined or reducing material on, while the dust for generation of burning is fallen on material, influences the quality of product.
3. the hot cigarette of rotary kiln is without recycling, but direct outlet, the waste of resource is caused, and hot cigarette is obstructed
It crosses cooling and is directly entered dust-extraction unit, such as fiber bag precipitator, the high temperature of hot cigarette is easy to destroy dust collecting sleeve, reduces dust collecting sleeve
Service life.
Summary of the invention
The present invention aiming at the shortcomings in the prior art, provides a kind of high heat utilization rate, material and the revolution separated of burning
Kiln.
The object of the invention is achieved through the following technical solutions:
A kind of rotary kiln of high-efficiency environment friendly, including kiln body, kiln head cover and kiln hood are provided, the kiln body is tube-in-tube structure, including
Outer cylinder, inner cylinder and the combustion chamber between outer cylinder and inner cylinder being coaxially fixedly installed；
Connection is mutually supported by pipeline between the outer cylinder and inner cylinder, and the material of outer cylinder is delivered to by inner cylinder by pipeline；
Outer cylinder close to described kiln body one end is equipped with feed inlet, is respectively equipped on the outer cylinder and inner cylinder of the kiln body other end
Outer cylinder discharge port and inner cylinder discharge port；
The both ends of the combustion chamber are respectively equipped with the air inlet pipe of connection gas source and discharge the escape pipe of exhaust gas, and in the air inlet
Heat-exchange device is equipped between pipe and escape pipe.
The present invention uses tube-in-tube structure kiln body, and combustion chamber is arranged between outer cylinder and inner cylinder, thus realization furnace
Thorax and feed separation；Pipeline connects outer cylinder and inner cylinder, on the one hand plays the role of supporting inner cylinder, on the other hand realize outer cylinder with it is interior
Intercommunication between cylinder；Heat-exchange device is set between air inlet pipe and escape pipe, the heat that carries for flue gas after burning and new
Gas into combustion chamber forms heat exchange.
Further, make material successfully from kiln hood to kiln tail, the kiln body is obliquely installed compared to horizontal plane, and described
Spiral lifting blade is additionally provided in inner cylinder or/and outer cylinder.
Further, the outer cylinder discharge port, inner cylinder discharge port and the gas outlet of combustion chamber are arranged at kiln hood one
Side.
Further, the feed inlet is arranged on outer cylinder, and is located at kiln head cover side.
Further, the air inlet of the combustion chamber and matched burner are arranged in kiln head cover side, wherein burning
Device is preferably natural gas combustion engine.
Further, dust-extraction unit is additionally provided on the escape pipe.
Preferably, the dust-extraction unit is bag filter.
Further, air-introduced machine is additionally provided on the air inlet pipe and escape pipe.
Further, the heat-exchange device is heat-exchanging chamber.
Compared with prior art, beneficial effects of the present invention are as follows:
The present invention uses tube-in-tube structure kiln body, and combustion chamber is arranged between outer cylinder and inner cylinder, thus realization burner hearth with
The separation of material avoids being in contact between the flue gas generated in burner hearth and material.
On the one hand the present invention is played the role of supporting inner cylinder, on the other hand be realized outer using pipeline connection outer cylinder and inner cylinder
Intercommunication between cylinder and inner cylinder, so that kiln body is during rotation, material can move between outer cylinder and inner cylinder, to make full use of
The thermal energy of combustion chamber.
The present invention is arranged heat-exchange device between air inlet pipe and escape pipe, realize the heat that carries flue gas after burning with
Newly into combustion chamber gas heat exchange, waste heat is brought back in rotary kiln again by new air inlet body, whole process both completed
Waste heat recycling and reusing, while also avoiding the discharge of high-temperature flue gas.
The whole heat utilization rate of rotary kiln can be increased to 82% or more from 50% by the present invention.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only
Some embodiments of the present invention, for those of ordinary skill in the art, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 rotary structure schematic diagram.
Fig. 2 kiln structure schematic diagram.
Wherein, 1- kiln body, 2- kiln head cover, 3- kiln hood, 4- outer cylinder, 5- inner cylinder, the combustion chamber 6-, 7- pipeline, 8- spiral are raised
Flitch, 9- feed inlet, 10- dust-extraction unit, 11- heat-exchange device, 12- air-introduced machine, 13- air-introduced machine, 41- outer cylinder discharge port, 51-
Inner cylinder discharge port, 61- air inlet pipe, 62- escape pipe, the gas outlet of the combustion chamber 63-, the air inlet of the combustion chamber 64-, 65- burner.
Specific embodiment
The present invention is further illustrated With reference to embodiment, wherein attached drawing only for illustration,
What is indicated is only schematic diagram, rather than pictorial diagram, should not be understood as the limitation to this patent；Reality in order to better illustrate the present invention
Example is applied, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To those skilled in the art
For, the omitting of some known structures and their instructions in the attached drawings are understandable.
Embodiment 1
As shown in Fig. 1~2, the present embodiment provides a kind of rotary kiln of high-efficiency environment friendly, including kiln body 1, kiln head cover 2 and kiln hood 3,
Kiln body 1 is tube-in-tube structure, including the outer cylinder 4, inner cylinder 5 and the combustion chamber between outer cylinder 4 and inner cylinder 5 being coaxially fixedly installed
6；
By the mutually support connection of pipeline 7 between outer cylinder 4 and inner cylinder 5, and the material of outer cylinder 4 is delivered to by inner cylinder by pipeline 7
5；Outer cylinder close to 1 one end of kiln body is equipped with feed inlet 9, is respectively equipped on the outer cylinder 4 and inner cylinder 5 of the kiln body other end outer
Cylinder discharge port 41 and inner cylinder discharge port 51；
The both ends of combustion chamber 6 are respectively equipped with the air inlet pipe 61 of connection gas source and discharge the escape pipe 62 of exhaust gas, and in air inlet pipe
Heat-exchange device 11 is equipped between 61 and escape pipe 62.
Tube-in-tube structure kiln body is used in the present embodiment, and by combustion chamber 6(burner hearth) it is arranged between outer cylinder 4 and inner cylinder 5,
To realization burner hearth and feed separation, the flue gas generated in burner hearth is avoided to contact with material, so that the harmful substance in fuel
And the dust in combustion process is attached on material, influences the quality of material.
Outer cylinder 4 and inner cylinder 5 are connected using pipeline 7 in the present embodiment, on the one hand play the role of supporting inner cylinder 5, another party
Intercommunication between outer cylinder 4 and inner cylinder 5 is realized in face, so that kiln body is during rotation, material can move between outer cylinder 4 and inner cylinder 5,
To take full advantage of the thermal energy of combustion chamber；Wherein, due to feed inlet 9 be arranged on outer cylinder 4, and combustion chamber 6 be located at outer cylinder 4 and
Between inner cylinder 5, therefore the temperature of outer cylinder 4 wants low compared to inner cylinder 5, and material first enters the process for having a preheating from outer cylinder 4；In addition
Outer cylinder discharge port is respectively equipped on outer cylinder 4 and inner cylinder 5 with 41 and inner cylinder discharge port 51, the setting of two outlets ensure that work
Efficiency.
Heat-exchange device 11 is set between air inlet pipe 61 and escape pipe 62 in the present embodiment, realizes that flue gas is certainly after burning
The heat of band with newly into combustion chamber 6 gas heat exchange, waste heat is brought back in rotary kiln again by new air inlet body, entire mistake
Journey had both completed waste heat recycling and reusing, while also avoiding the discharge of high-temperature flue gas.
Further, in this embodiment kiln body 1 compares horizontal plane in order to make material smoothly from kiln hood enters, kiln tail comes out
It is obliquely installed, the angle with horizontal plane is 3~5 °, and is equipped with spiral lifting blade 8 for turning round in inner cylinder 4 or/and outer cylinder 5
Material is pushed in the process.
Respectively go out in the present embodiment, feeding inlet and pipeline arrangement it is as follows:
The gas outlet 63 of outer cylinder discharge port 41, inner cylinder discharge port 51 and combustion chamber is arranged at 3 side of kiln hood, feed inlet 9
It is arranged on outer cylinder 4, and is located at 2 side of kiln head cover, the air inlet 64 and matched burner 65 of combustion chamber is arranged in kiln hood
2 sides are covered, burner 65 is preferably energy-saving and environment-friendly natural gas combustion engine.
Dust-extraction unit 10 is additionally provided in the present embodiment on escape pipe 62, the flue gas that combustion chamber 6 excludes first is removed
Dirt is then exhausted from atmosphere, and wherein dust-extraction unit 10 is preferably fiber bag precipitator, and is divided in air inlet pipe 61 and escape pipe 62
It She You not air-introduced machine 12 and air-introduced machine 13.
The working principle of the present embodiment is as follows；Material is entered in outer cylinder by feed inlet, with the rotation of kiln body, material
Pass through pipe in the process
Road is round-trip between outer cylinder and inner cylinder, and slowly mobile from kiln hood position to kiln tail position, finally from the discharging of inner cylinder
The discharge port of mouth or outer cylinder comes out；
And the flue gas that combustion chamber excludes then first passes through heat-exchanging chamber and new air inlet body carries out heat exchange, then passes through cloth-sack-type dust removal
Device is discharged into atmosphere.
The present embodiment has passed through test, and whole heat utilization rate is very high, can be by the whole heat energy utilization of original rotary kiln
Rate is increased to 82% or more from 50%.
Obviously, above-described embodiment is only intended to clearly illustrate technical solution of the present invention example, and is not
Restriction to embodiments of the present invention.For those of ordinary skill in the art, on the basis of the above description also
It can make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all
Made any modifications, equivalent replacements, and improvements etc. within the spirit and principles in the present invention should be included in right of the present invention and want
Within the protection scope asked.
Description of the invention is given for the purpose of illustration and description, and is not exhaustively or will be of the invention
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches
It states embodiment and is to more preferably illustrate the principle of the present invention and practical application, and those skilled in the art is enable to manage
The solution present invention is suitable for the various implementations with various modifications of special-purpose to design.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811387099.XA CN109237936A (en) | 2018-11-21 | 2018-11-21 | A kind of rotary kiln of high-efficiency environment friendly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811387099.XA CN109237936A (en) | 2018-11-21 | 2018-11-21 | A kind of rotary kiln of high-efficiency environment friendly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109237936A true CN109237936A (en) | 2019-01-18 |
Family
ID=65075461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811387099.XA Pending CN109237936A (en) | 2018-11-21 | 2018-11-21 | A kind of rotary kiln of high-efficiency environment friendly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109237936A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113154872A (en) * | 2021-04-22 | 2021-07-23 | 重庆科技学院 | Low-temperature plasma combined rotary kiln |
| WO2023016057A1 (en) * | 2021-08-09 | 2023-02-16 | 广东邦普循环科技有限公司 | Positive electrode material drying apparatus and positive electrode material drying production line |
| CN118687369A (en) * | 2024-08-22 | 2024-09-24 | 徐州楚润重型机械制造有限公司 | A chemical kiln for treating materials that can produce toxic and harmful waste gases |
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|---|---|---|---|---|
| WO1989002057A1 (en) * | 1987-09-03 | 1989-03-09 | Showa Denko Kabushiki Kaisha | Externally heated rotary kiln |
| JP2002147962A (en) * | 2000-11-02 | 2002-05-22 | Ishikawajima Harima Heavy Ind Co Ltd | External heat type kiln air volume control device |
| JP2008215699A (en) * | 2007-03-02 | 2008-09-18 | Fujita Seisakusho:Kk | Rotary kiln and drying device |
| CN201964783U (en) * | 2010-12-31 | 2011-09-07 | 邹岳明 | High-temperature heat energy recovery converter |
| CN105043092A (en) * | 2015-09-05 | 2015-11-11 | 吉首大学 | Manganese processing rotary kiln with gas furnace supplying heat |
| CN206944632U (en) * | 2017-03-01 | 2018-01-30 | 宁波亿星新型材料科技有限公司 | A kind of haydite rapid drying device |
| CN209131375U (en) * | 2018-11-21 | 2019-07-19 | 衡阳县天宇陶瓷矿业有限公司 | An efficient and environmentally friendly rotary kiln |
-
2018
- 2018-11-21 CN CN201811387099.XA patent/CN109237936A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989002057A1 (en) * | 1987-09-03 | 1989-03-09 | Showa Denko Kabushiki Kaisha | Externally heated rotary kiln |
| US4978294A (en) * | 1987-09-03 | 1990-12-18 | Tosera Engineering Co., Ltd. | External heating rotary furnace |
| JP2002147962A (en) * | 2000-11-02 | 2002-05-22 | Ishikawajima Harima Heavy Ind Co Ltd | External heat type kiln air volume control device |
| JP2008215699A (en) * | 2007-03-02 | 2008-09-18 | Fujita Seisakusho:Kk | Rotary kiln and drying device |
| CN201964783U (en) * | 2010-12-31 | 2011-09-07 | 邹岳明 | High-temperature heat energy recovery converter |
| CN105043092A (en) * | 2015-09-05 | 2015-11-11 | 吉首大学 | Manganese processing rotary kiln with gas furnace supplying heat |
| CN206944632U (en) * | 2017-03-01 | 2018-01-30 | 宁波亿星新型材料科技有限公司 | A kind of haydite rapid drying device |
| CN209131375U (en) * | 2018-11-21 | 2019-07-19 | 衡阳县天宇陶瓷矿业有限公司 | An efficient and environmentally friendly rotary kiln |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113154872A (en) * | 2021-04-22 | 2021-07-23 | 重庆科技学院 | Low-temperature plasma combined rotary kiln |
| WO2023016057A1 (en) * | 2021-08-09 | 2023-02-16 | 广东邦普循环科技有限公司 | Positive electrode material drying apparatus and positive electrode material drying production line |
| GB2617022A (en) * | 2021-08-09 | 2023-09-27 | Guangdong Brunp Recycling Technology Co Ltd | Positive electrode material drying apparatus and positive electrode material drying production line |
| ES2968937R1 (en) * | 2021-08-09 | 2024-10-21 | Guangdong Brunp Recycling Technology Co Ltd | CATHODE MATERIAL DRYING DEVICE AND CATHODE MATERIAL DRYING PRODUCTION LINE |
| CN118687369A (en) * | 2024-08-22 | 2024-09-24 | 徐州楚润重型机械制造有限公司 | A chemical kiln for treating materials that can produce toxic and harmful waste gases |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 421200 Xian Zhong village, Hengyang Town, Hengyang, Hunan Applicant after: Hengyang Tianyu New Material Co.,Ltd. Address before: 421200 Xian Zhong village, Hengyang Town, Hengyang, Hunan Applicant before: HENGYANG TIANYU CERAMIC MINING INDUSTRY Co.,Ltd. |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190118 |