CN101269949A - Ignition method and apparatus of product line for sintering porcelain granule - Google Patents
Ignition method and apparatus of product line for sintering porcelain granule Download PDFInfo
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- CN101269949A CN101269949A CNA2008100975400A CN200810097540A CN101269949A CN 101269949 A CN101269949 A CN 101269949A CN A2008100975400 A CNA2008100975400 A CN A2008100975400A CN 200810097540 A CN200810097540 A CN 200810097540A CN 101269949 A CN101269949 A CN 101269949A
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- portfire
- combustion
- ignition
- supporting gas
- sinter box
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005245 sintering Methods 0.000 title claims description 25
- 229910052573 porcelain Inorganic materials 0.000 title abstract 3
- 239000008187 granular material Substances 0.000 title 1
- 239000002994 raw material Substances 0.000 claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 230000001939 inductive effect Effects 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 238000010792 warming Methods 0.000 claims description 6
- 230000005587 bubbling Effects 0.000 claims description 5
- 230000008676 import Effects 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 5
- 206010020843 Hyperthermia Diseases 0.000 claims description 4
- 230000036031 hyperthermia Effects 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 7
- 239000000428 dust Substances 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 31
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000003245 coal Substances 0.000 description 4
- 235000009508 confectionery Nutrition 0.000 description 4
- 239000000295 fuel oil Substances 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 229940098458 powder spray Drugs 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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- Furnace Details (AREA)
- Tunnel Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention relates to an ignition method and an ignition device, which are applied to the baking porcelain grain production line. The ignition method: the temperature of the ignition device is increased to pre-determined temperature, generally 800 to 1350 DEG C, a baking box that is fully provided with the baking raw materials is close to the ignition device at high temperature to reach the closed state, and then to be preheated; the baking box is ventilated with air or other combustion-assistant gas to assist the combustion, so that the surface of the raw materials can be combusted adequately; the temperature in the ignition device is introduced downwards by the guiding air so as to increase the thickness of the ignition layer; the air introduction is stopped after the ignition, and the ignited baking box is moved to a next position, and simultaneously the next baking box that is fully provided with the baked raw materials is moved to the ignition position. With the present invention, the ignition efficiency at the surface of the baking box is high, thereby greatly reducing the heat waste and shortening the ignition time; moreover, the porcelain grain that is arranged on the surface of the baking box is combusted adequately without breaking or dust; the particle is complete, thus improving the rate of the finished product of the production line. The ignition device has simple structure, not only has low production cost, but also greatly reduces the running operation compared with the traditional ignition system.
Description
Technical field
The present invention relates to ignition method and device in a kind of chamber type sintering process, particularly a kind of ignition method and device that is used for the sintering ceramsite production line.
Background technology
Sintering process is widely used in many industrial circles, for example, in industries such as metallurgy, building materials and environmental protection, process certain temperature sintering such as iron powder or metallic ore raw material, flyash, clay and shale is made the spherulitic product or the sintered article of desirable strength later on.Traditional sintering ignition mode is to adopt modes such as Sweet natural gas, fuel oil or Coal powder spray to light a fire, and its flame has certain pressure and destructiveness, can destroy the upper layer of raw material during igniting.It is 200610002094.1 that the present inventor has submitted application number on January 25th, 2006, name is called the Chinese invention patent application of " method and the device that are used for sintering ceramsite of fly ash ", it discloses a kind of production line of sintering ceramsite of fly ash, but does not go through for portfire wherein.
Summary of the invention
The purpose of this invention is to provide a kind of ignition method and device that is used for the sintering ceramsite production line, ignition method can not destroy the igniting surface of sintered layer, realize the control of the warm up time that surface ignition needs easily, the surperficial haydite sufficient combustion of sinter box, no fragmentation or dust, particle integrity has improved the yield rate of production line.Simultaneously, portfire is simple, and except comparing with traditional portfire, outside manufacturing cost reduced greatly, running cost also reduced a lot, really realizes energy-conserving and environment-protective.
In order to achieve the above object, the present invention is achieved in that
A kind of ignition method that is used for the sintering ceramsite production line comprises the steps:
(1) earlier portfire is warming up to design temperature, generally at 800～1350 ℃, is warming up to after the design temperature, portfire will maintain about set temperature value automatically;
(2) portfire that will be covered with the sinter box of raw material to be sintered and the condition of high temperature near and reach sealed state after, carry out preheating;
(3) bubbling air or other combustion-supporting gas carry out combustion-supportingly, make the fully burning of portfire surface;
(4) make by air inducing and draw under the high temperature in the portfire, increase the thickness of an ignition layer;
(5) after igniting is finished, stop air inducing, the sinter box after the igniting is transported to next position, the sinter box that simultaneously next one is covered with raw material to be sintered is transported to ignition location.
Igniting and/or preheating are to light and/or toast raw material to be sintered by hyperthermia radiation.
The sinter box that will be covered with material moves to the below of portfire, by a lifting gear sinter box is promoted, and combines closely with the sealing-ring under the portfire, reaches sealed state.
The air inducing step is the air inducing valve of opening under the air inducing chamber.
In portfire with after sinter box docks, 10～300 seconds of preheating.
After preheating was finished, by combustion-supporting gas passage introducing air or other combustion-supporting gas, the additional combustion-supporting gas time was 10～300 seconds.
Air or other combustion-supporting gas are 50～4000Pa at the pressure of combustion-supporting gas channel outlet, and flow is 0.1～10 cubic meters per minute.
Induced draught system under the sinter box draws the high temperature in the portfire downwards, and the air inducing time is 10～600 seconds.
After igniting is finished, close the air inducing valve under the air inducing chamber.
Steps such as preheating, combustion-supporting, following air inducing can be carried out by juxtaposition.
A kind of portfire that is used for the sintering ceramsite production line, it comprises top cover and housing, and there is insulating inside, and the heat insulation sealing in the top of device is also ventilative; There is the electrical heating element device device inside, be used to make portfire to heat up, intensification reaches after the value of setting, the sinter box that will be covered with raw material to be sintered move under the portfire and lifting and fixed portfire under sealing-ring combine closely, treat raw materials for sintering and carry out preheating; Bottom of device has the combustion-supporting gas passage, be used for after preheating carrying out from outside bubbling air or other combustion-supporting gas combustion-supporting, the surface of lighting raw material to be sintered.
The internal structure of device is right cylinder, square body or polyhedron.
Described electrical heating element device is high temperature resistance silk or other exothermic material.
Insulating is arranged in the periphery and the top of portfire.
High-temperature resistant seal ring is arranged at the bottom in portfire, is used for and the sinter box sealing, reaches sealed state during igniting.
The combustion-supporting gas passage comprises export and import, the outlet be evenly arranged in the portfire inwall around, quantity is 1～12, import volume can be single or several.
A plurality of outlets on the combustion-supporting gas passage are in order to guarantee that combustion-supporting gas evenly enters.
Technological process of the present invention is as follows:
(1) earlier portfire is warming up to design temperature, is generally 800～1350 ℃; Be warming up to after the design temperature, temperature will maintain about set temperature value automatically in the stove.
(2) in sinter box, be covered with raw material ball (raw material to be sintered);
(3) sinter box that will be covered with material moves to the below of portfire;
(4) by lifting gear sinter box is promoted, combine closely, reach sealed state with the sealing-ring under the portfire;
When (5) promoting sinter box, promote the air inducing chamber under the sinter box simultaneously, seal by sealing-ring between air inducing chamber and the sinter box.The following pipeline of air inducing chamber communicates with dust chamber or induced draft fan, and can move up and down flexibly, and the pipeline part that relatively moves adopts portable tightness system;
(6) after sinter box and portfire sealing, carry out preheating, by preheating raw material to be sintered is fully cured, moisture is wherein fully discharged;
(7) bubbling air or other combustion-supporting gas after preheating is finished make the fully burning of pyritous raw materials for sintering surface;
(8) open the valve of the air inducing under the air inducing chamber, will draw under the high temperature in the portfire, increase the thickness of an ignition layer;
(9) after igniting is finished, valve-off is transported to next position with the sinter box after the igniting, and the sinter box that will newly be covered with raw material ball (raw material) simultaneously is transported to the portfire below, finishes
An ignition cycle.
Compared with prior art, beneficial effect of the present invention is:
Adopting sealing fully between portfire and the sinter box, fully burns and each step of reference mark fire bed (surface combustion layer) thickness in preheating, the top layer that needs than being easier to realize lighting a fire.Adopt portfire of the present invention, the efficient height of sinter box surface ignition, igniting evenly, significantly reduce thermal waste, ignition time weak point, the surperficial haydite sufficient combustion of sinter box, no fragmentation or dust, particle integrity, improved the yield rate of production line.Ignition device structure of the present invention is simple, low cost of manufacture not only, and running cost also reduces greatly than classical ignition system.
Description of drawings
Fig. 1 is the ignition device structure synoptic diagram that the present invention is used for the sintering ceramsite production line.
Fig. 2 is the A-A sectional view of Fig. 1.
Fig. 3 is ignition process structure iron (synoptic diagram that portfire cooperates with sinter box).
In Fig. 1:
1, electrical heating element device 2, top cover 3, insulating 4, air outlet 5, sealing-ring 6, combustion-supporting gas passage 7, housing 8, intake ducting
In Fig. 2:
3, insulating 4, air outlet 8, intake ducting
In Fig. 3:
9, portfire 10, portfire support 11, sinter box 12, lift 13, air inducing chamber 14, air inducing valve 15, air inducing pipeline 5, sealing-ring
Embodiment
Introduce the specific embodiment of the present invention below in conjunction with accompanying drawing.
The portfire that is used for the special use of sintering ceramsite production line of the present invention, its constructional feature is:
Adopting electricity as the igniting energy, is not to adopt other fuel such as fuel oil, Sweet natural gas or coal.If adopt modes such as Sweet natural gas, fuel oil or Coal powder spray to light a fire, its flame has certain pressure and destructiveness, so sparking mode of the present invention can not destroyed the igniting surface of raw materials for sintering.
The internal structure space of portfire can be right cylinder, square body or polyhedron.The top is for sealing or adopt heat insulation air-permeable layer (or hole), to discharge the water vapor that the ignition process pre-heating step produces; The bottom is open, and the combustion-supporting gas passage is installed.Be furnished with electrothermal component in the lighter for ignition, be used for heating up to portfire.
The combustion-supporting gas passage of installing in the portfire, when being used to burn from external complement air or other combustion-supporting gas, the outlet of passage be evenly arranged in the lighter for ignition inwall around, the quantity of outlet is determined according to the size of lighter for ignition, be generally 1-12 outlet (being shown as 8 outlets among the figure), to guarantee to be distributed to uniformly the surface of sinter box from the gas of external complement.The import volume of passage does not limit, and can be single, can be several yet.
Combustion-supporting gas is usually placed in the bottommost of sinter box, and channel sized is determined according to the air of burning needs or the flow rate calculation that other combustion-supporting gas passes through.
Combustion-supporting gas channel interior structure can adopt independently isolated chamber, with guarantee behind air or other combustion-supporting gas admission passage can be uniformly from the air outlet 4 closed regions that enter sinter box and lighter for ignition.
High-temperature resistant seal ring is arranged at the bottom of portfire, the sealing fully when being used for docking igniting with sinter box between guarantee point firearm and the sinter box.
The periphery of portfire is equipped with high temperature material, is used for heat-insulation and heat-preservation.
Top seal or adopt heat insulation air-permeable layer (or hole), the water vapor that produces when discharging igniting.
Accompanying drawing is an embodiment of portfire of the present invention.
Referring to Fig. 1, Fig. 2, portfire is made of housing, insulating, top cover, electrical heating element device, combustion-supporting gas passage, intake ducting and sealing-ring etc., this portfire is a right cylinder, thermopair is equipped with at the top, be used for the internal temperature of measuring point firearm, the electrical heating element device of lighter for ignition is the high temperature resistance silk.For the air output that guarantees each air outlet on the combustion-supporting gas passage as much as possible even, the combustion-supporting gas passage adopts dividing plate to be divided into two chambers, an intake ducting and four air outlets are arranged on each chamber, air or combustion-supporting gas redistribute after entering the combustion-supporting gas passage respectively, and evenly combustion-supporting effect is played on the surface that enters sinter box then uniformly from each air outlet.
The ignition process process that this device is finished is:
The ignition process of portfire is to being finished by the surface of an ignition material by the intravital hyperthermia radiation of stove, the flame that has certain pressure that no traditional sparking mode adopts in the stove (adopts modes such as Sweet natural gas, fuel oil or Coal powder spray to light a fire, its flame has certain pressure and destructive force, especially when combustion flame is directly injected to the raw material surface, can cause certain destruction to the raw material surface), so the sparking mode of this invention can not destroyed the igniting surface of sintered layer.The ignition temperature of this invention portfire is generally 800 ℃-1350 ℃.
Achieve a butt joint when igniting with the sinter box that is covered with raw material ball, portfire generally is fixed on the top of sinter box, as Fig. 3, by lift sinter box is promoted to sealing-ring under the portfire.Realize docking igniting with portfire hermetically sealed, promptly the hyperthermia radiation of electrical heating element device is finished the igniting of raw materials for sintering to the surface of raw materials for sintering.
Whole ignition process comprises preheating, combustion-supporting and air inducing step, wherein after sinter box and portfire Butt sealing, carry out preheating 10-300 second, promptly keep the baking naturally under the situation of no any negative pressure of raw materials for sintering surface, to reach the purpose of moisture content in the evaporation raw material.Need not to enter air or other combustion-supporting gas this moment, also need not to start air inducing under the sinter box.
After preheating is finished,, the upper layer of the raw materials for sintering that reaches a high temperature is taken fire by combustion-supporting gas passage introducing air or other combustion-supporting gas.The air of introducing by the combustion air passage or other combustion-supporting gas are at export requirement low pressure, slug flow speed and the high flow capacity of passage, and pressure is generally at 50-4000Pa, and flow is the 0.1-10 cubic meters per minute, and the additional combustion-supporting gas time is 10-400 second.
After finishing the upper layer burning, start the induced draught system under the sinter box, will draw under the high temperature in the lighter for ignition, increase the thickness of raw materials for sintering surface combustion layer in the sinter box, with guarantee point pyrogene merit.The air inducing time is generally 10-500 second.
After igniting is finished, close the air inducing valve under the air inducing chamber.
For saving total ignition time, the preheating in the above-mentioned ignition process, combustion-supporting and following air inducing step also can replace overlapping carrying out.
Claims (17)
1. an ignition method that is used for the sintering ceramsite production line is characterized in that, comprises the steps:
(1) earlier portfire is warming up to design temperature, generally at 800～1350 ℃, is warming up to after the design temperature, portfire will maintain about set temperature value automatically;
(2) portfire that will be covered with the sinter box of raw material to be sintered and the condition of high temperature near and reach sealed state after, carry out preheating;
(3) bubbling air or other combustion-supporting gas carry out combustion-supportingly, make the fully burning of portfire surface;
(4) make by air inducing and draw under the high temperature in the portfire, increase the thickness of an ignition layer;
(5) after igniting is finished, stop air inducing, the sinter box after the igniting is transported to next position, the sinter box that simultaneously next one is covered with raw material to be sintered is transported to ignition location.
2. ignition method according to claim 1 is characterized in that: igniting and/or preheating are to light and/or toast raw material to be sintered by hyperthermia radiation.
3. ignition method according to claim 1 is characterized in that: the sinter box that will be covered with material moves to the below of portfire, by a lifting gear sinter box is promoted, and combines closely with the sealing-ring under the portfire, reaches sealed state.
4. ignition method according to claim 1 is characterized in that: the air inducing step is the following air inducing valve of opening under the air inducing chamber.
5. ignition method according to claim 1 is characterized in that: in portfire with after sinter box docks, 10～300 seconds of preheating.
6. ignition method according to claim 1 is characterized in that: after preheating was finished, by combustion-supporting gas passage introducing air or other combustion-supporting gas, the additional combustion-supporting gas time was 10～300 seconds.
7. ignition method according to claim 4 is characterized in that: air or other combustion-supporting gas are 50～4000Pa at the pressure of combustion-supporting gas channel outlet, and flow is 0.1～10 cubic meters per minute.
8. ignition method according to claim 1 is characterized in that: the induced draught system under the sinter box draws the high temperature in the portfire downwards, and the air inducing time is 10～600 seconds.
9. ignition method according to claim 1 is characterized in that: after igniting is finished, close the air inducing valve under the sinter box.
10. ignition method according to claim 1 is characterized in that: steps such as preheating, combustion-supporting, following air inducing can be carried out by juxtaposition.
11. a portfire that is used for the sintering ceramsite production line is characterized in that: it comprises top cover and housing, and there is insulating inside, the heat insulation sealing in the top of device is also ventilative; There is the electrical heating element device device inside, be used to make portfire to heat up, intensification reaches after the value of setting, and the sinter box that will be covered with raw material to be sintered moves under the portfire and the sealing-ring that promotes and be fixed under the portfire is combined closely, and treats raw materials for sintering and carries out preheating; Bottom of device has the combustion-supporting gas passage, be used for after preheating carrying out from outside bubbling air or other combustion-supporting gas combustion-supporting, the surface of lighting raw material to be sintered.
12. portfire according to claim 11 is characterized in that: the internal structure of described device is right cylinder, square body or polyhedron.
13. portfire according to claim 11 is characterized in that: described electrical heating element device is high temperature resistance silk or other exothermic material.
14. portfire according to claim 11 is characterized in that: described insulating is arranged in the periphery and the top of portfire.
15. portfire according to claim 11 is characterized in that: high-temperature resistant seal ring is arranged at the bottom in portfire, is used for and the sinter box sealing, reaches sealed state during igniting.
16. portfire according to claim 11 is characterized in that: described combustion-supporting gas passage comprises export and import, the outlet be evenly arranged in the portfire inwall around, quantity is 1～12, import volume can be single or several.
17. portfire according to claim 11 is characterized in that: a plurality of outlets on the described combustion-supporting gas passage are in order to guarantee that combustion-supporting gas evenly enters.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100975400A CN101269949B (en) | 2008-05-12 | 2008-05-12 | Ignition apparatus of product line for sintering porcelain granule |
| JP2009112647A JP5584429B2 (en) | 2008-05-12 | 2009-05-07 | Ignition method and ignition sintering apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100975400A CN101269949B (en) | 2008-05-12 | 2008-05-12 | Ignition apparatus of product line for sintering porcelain granule |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101269949A true CN101269949A (en) | 2008-09-24 |
| CN101269949B CN101269949B (en) | 2010-12-01 |
Family
ID=40004208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100975400A Expired - Fee Related CN101269949B (en) | 2008-05-12 | 2008-05-12 | Ignition apparatus of product line for sintering porcelain granule |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5584429B2 (en) |
| CN (1) | CN101269949B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108264252A (en) * | 2018-01-11 | 2018-07-10 | 晋中市祁宏粉煤灰科技开发有限公司 | A kind of box positive pressure sintering ceramsite of fly ash production line of green |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0814763A (en) * | 1994-06-29 | 1996-01-19 | Nippon Steel Corp | Production sintered ore |
| JPH11108563A (en) * | 1997-10-08 | 1999-04-23 | Nkk Corp | Method for regulating pressure in ignition furnace of sintering machine, and its device |
| JP2895467B1 (en) * | 1998-03-20 | 1999-05-24 | 日本ニユクリア・フユエル株式会社 | Nuclear fuel pellet sintering equipment |
-
2008
- 2008-05-12 CN CN2008100975400A patent/CN101269949B/en not_active Expired - Fee Related
-
2009
- 2009-05-07 JP JP2009112647A patent/JP5584429B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108264252A (en) * | 2018-01-11 | 2018-07-10 | 晋中市祁宏粉煤灰科技开发有限公司 | A kind of box positive pressure sintering ceramsite of fly ash production line of green |
| CN108264252B (en) * | 2018-01-11 | 2023-09-08 | 晋中市祁宏粉煤灰科技开发有限公司 | Green box-type positive pressure fly ash sintered ceramsite production line |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5584429B2 (en) | 2014-09-03 |
| CN101269949B (en) | 2010-12-01 |
| JP2009276056A (en) | 2009-11-26 |
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Address after: Two Beijing city Chaoyang District District 100102 Wangjing Lize Park No. 203 No. 3 in 7 floor room 1703 Patentee after: Beijing Huaxia Tyco Environmental Protection Technology Co., Ltd. Address before: 100081, Beijing Wangjing Chaoyang District Development Zone love building block A 3 Patentee before: Beijing STICH Co., Ltd. |
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Effective date of registration: 20201020 Address after: 100102 1915, 9 / F, building 3, No. 203, Lize Zhongyuan, Wangjing, Chaoyang District, Beijing Patentee after: BEIJING HUAXIA METECH ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Address before: 300385 no.11-1, Saida Jiuzhi Road, Xiqing Economic and Technological Development Zone, Xiqing District, Tianjin Patentee before: Tianjin Huaxia Yitai Environmental Engineering Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101201 Termination date: 20210512 |