CN201343547Y - Dust removal system for secondary flue gas in ventilation shaft and revolving furnace - Google Patents
Dust removal system for secondary flue gas in ventilation shaft and revolving furnace Download PDFInfo
- Publication number
- CN201343547Y CN201343547Y CNU2009200833293U CN200920083329U CN201343547Y CN 201343547 Y CN201343547 Y CN 201343547Y CN U2009200833293 U CNU2009200833293 U CN U2009200833293U CN 200920083329 U CN200920083329 U CN 200920083329U CN 201343547 Y CN201343547 Y CN 201343547Y
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- flue gas
- dust
- shaft
- secondary flue
- stokehold
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The utility model relates to the dust removal and environmental protection field, in particular to a dust removal system for secondary flue gas in a ventilation shaft and a revolving furnace in steel works. On the basis of the prior dust removal system for secondary flue gas of the revolving furnace, a shaft dust hood and a louver valve are arranged at the air outlet of the ventilation shaft, and the rest part of the air outlet of the ventilation shaft except the shaft dust hood and the louver valve is sealed; and a ventilation shaft dust removal pipeline is arranged, one end of the dust removal pipeline is connected with the shaft dust hood, and the other end thereof is led into the secondary flue gas dust removal pipeline of the revolving furnace. Through a few changes, the ventilation shaft dust removal system and the prior revolving furnace secondary flue gas dust removal are combined together, so as to form a new dust removal system; and the new system not only ensures dust removal of secondary flue gas during the normal smelting of the revolving furnace, but also solves the problem that when a sealing hood is opened for hot metal charging or molten steel discharging, pollution is caused due to the flue gas fleeing into the ventilation shaft, so that a big problem is solved with small cost.
Description
Technical field
The utility model relates to the dedusting environment friendly field, especially a kind of dust-removal system that is used for ventilating shaft and converter secondary flue gas in the steel mill.
Background technology
In convertor steelmaking process, open when stokehold cover and in converter, to add steel scrap and hot metal charging, and the stove back cover can produce a large amount of ash-laden gass when opening converter tapping water.Though hot metal charging and the time that goes out molten steel have only about 3min, and under the situation that the final dusting seal closure is opened, hot metal charging and the flue gas that produces when the going out molten steel factory building roof of directly climbing sharply.The dust settling that the sub-fraction flue gas carries causes the potential safety hazard of equipment operation and the environmental pollution in the workshop to miscellaneous equipments such as stokehold platform, driving, and affects greatly the worker is healthy.Another most of flue gas directly enters atmosphere by the ventilating shaft on roof, pollutes roof and surrounding enviroment.In today more and more higher, the smoke and dust treatment of ventilating shaft is seemed very necessary to environmental requirement.
Because environmental pollution is administered and is paid little attention to before China, up to the present most steel mills also only administer the flue gas and the secondary flue gas of converter steelmaking, have even secondary flue gas does not all have to administer, saying nothing of produce when infusion of financial resources is administered hot metal charging and gone out molten steel scurried into the flue gas in the ventilating shaft.Because the attention degree that reason on the one hand is China's environmental pollution administers is not enough; Yi Fangmian reason is need drop into a lot of financial resources, material resources, manpower to environmental improvement in addition, has directly increased the cost of enterprise; Also has reason on the one hand just in each stove molten steel smelting cycle, scurrying into the time that the flue gas in the ventilating shaft continues at hot metal charging with when going out molten steel is not very long, front and back respectively had only about 3 minutes, add up and also have only time about 6 minutes, each enterprise thinks that the very big one-tenth of flower is original and administers the flue gas that every stove steel produces in these 6 minutes and very calculate, the improvement of this part is paid little attention to.We can say at present domestic to smoke gas treatment in the ventilating shaft or blank out.
Even will administer the flue gas in the ventilating shaft, the method for generally expecting also is the pollution problem that a newly-built cover dust-removal system is used for administering the ventilating shaft flue gas, comprises newly-built civil engineering, dust hood, pipeline, fly-ash separator, blower fan, motor, defeated grey equipment etc.And a newly-built cover dust-removal system will expend huge cost, comprises the construction cost in early stage and daily working cost etc., has increased very big cost pressure to enterprise.In addition in each stove molten steel smelting cycle, hot metal charging and the time length that produces flue gas when going out molten steel had only about 6 minutes, and have the tap to tap time of one heat steel water about 40 minutes, hot metal charging also only accounts for 15% of the whole smelting cycle of one heat steel with the time sum that goes out molten steel, if allow dust-removal system continuous service in 40 minutes, can produce very big running cost.Even save running cost, can not allow dust-removal system move, and in At All Other Times, stop at hot metal charging with in about the 6 minutes times when going out molten steel.Because frequent like this startup and stop to cause very big influence, particularly high-voltage motor to the operation life of equipment.The method that reduces running cost also can only be equipment such as configuration fluid-flywheel clutch or frequency transformer in dust-removal system, makes the dust-removal system high-speed cruising at hot metal charging with in about the 6 minutes times when going out molten steel, and make the dust-removal system low cruise in other tap to tap time.We can say that it is not a kind of good method that a newly-built cover dust-removal system is used for the smoke pollution of special administration ventilating shaft.
How the ventilating shaft dedusting scheme of reduced investment, good dedusting effect is provided, and is an important topic in steel mill ventilating shaft dedusting field.
The utility model content
The purpose of this utility model is at the prior art deficiency, and a kind of dust-removal system is provided, and can high-efficiency and low-cost ground realizes the dry method dust of ventilating shaft.
In order to achieve the above object, the technical scheme that the utility model provides is: the dust-removal system that is used for ventilating shaft and converter secondary flue gas, comprise converter secondary flue gas dust-removal system, described converter secondary flue gas dust-removal system is provided with converter secondary flue gas dedusting enclosed hood, the stokehold dust hood, dust hood behind the stove, converter secondary flue gas cleaning shaft, sack cleaner, blower motor and chimney, dust hood is arranged on the converter secondary flue gas dedusting enclosed hood behind stokehold dust hood and the stove, dust hood inserts sack cleaner through converter secondary flue gas cleaning shaft behind stokehold dust hood and the stove, sack cleaner and blower motor, chimney connects successively, at the ventilating shaft air outlet vertical shaft dust hood and blinds valve are set, with the position seals of ventilating shaft air outlet except that vertical shaft dust hood and blinds valve; The ventilating shaft cleaning shaft is set, and ventilating shaft cleaning shaft one end connects the vertical shaft dust hood, and the other end inserts converter secondary flue gas cleaning shaft.
And, between stokehold dust hood and the converter secondary flue gas cleaning shaft stokehold butterfly valve is set, butterfly valve behind the stove is set between dust hood and the converter secondary flue gas cleaning shaft behind the stove; The vertical shaft butterfly valve is set in the ventilating shaft cleaning shaft.
And, the automatic control equipment that butterfly valve behind control stokehold butterfly valve, the stove, vertical shaft butterfly valve and blinds valve open and close is set.
And described automatic control equipment adopts programmable logic controller.
And described converter secondary flue gas dedusting enclosed hood is provided with moving door behind the stokehold moving door that is subjected to stokehold control center control and the stove; Set up between described automatic control equipment and the stokehold control center and communicate by letter.
The utility model is ingenious to utilize original converter secondary flue gas dust-removal system, and the flue gas of ventilating shaft is introduced existing bag-type dust equipment in the secondary flue gas dust-removal system, has administered the flue gas in the ventilating shaft easily.The characteristics of scurrying into the flue gas discontinuity in the ventilating shaft that can also utilize converter to produce at hot metal charging with when going out molten steel, with the chain control of dust-removal system and stokehold control center, assurance does not influence original secondary flue gas dust removing effects.Multiple advantages such as the utlity model has less investment, efficiency of dust collection height, system is stable, maintenance workload is little, working cost is low.
Description of drawings
Fig. 1 is the utility model system construction drawing.
Embodiment
Describe the technical scheme that the utility model provides in detail below in conjunction with drawings and Examples:
The utility model improves on original converter secondary flue gas dust-removal system basis: the air outlet at ventilating shaft 5 is provided with vertical shaft dust hood 3 and blinds valve 4, with the position seals of ventilating shaft 5 air outlets except that vertical shaft dust hood 3 and blinds valve 4; Ventilating shaft cleaning shaft 1 is set, and ventilating shaft cleaning shaft 1 one ends connect vertical shaft dust hood 3, and the other end inserts converter secondary flue gas cleaning shaft 15.Ventilating shaft cleaning shaft 1 inserts converter secondary flue gas cleaning shaft 15, just flue gas in the vertical shaft dust hood 3 collected ventilating shafts 5 has been inserted sack cleaner 16.During concrete enforcement, can respectively establish a blinds valve 4 in vertical shaft dust hood 3 both sides, the part of ventilating shaft 5 air outlets except that vertical shaft dust hood 3 and blinds valve 4 is airtight with steel plate.Switch by blinds valve 4 can determine whether the flue gas of ventilating shaft 5 directly enters atmosphere, and the size of blinds valve 4 is selected to want suitably, if oversize, then is not suitable for installing at ventilating shaft 5 air outlets; If undersized, then influence gas normal convection in the ventilating shaft 5.
For the ease of the control dust removal process, the utility model provides further technical scheme: between stokehold dust hood 9 and the converter secondary flue gas cleaning shaft 15 stokehold butterfly valve 7 is set, butterfly valve 12 behind the stove is set between dust hood 13 and the converter secondary flue gas cleaning shaft 15 behind the stove; Vertical shaft butterfly valve 2 is set in the ventilating shaft cleaning shaft 1.During concrete enforcement, stokehold butterfly valve 7 can be arranged on being in charge of between stokehold dust hood 9 and the converter secondary flue gas cleaning shaft 15, and butterfly valve 12 can be arranged on being in charge of between the dust hood 13 and converter secondary flue gas cleaning shaft 15 behind the stove behind the stove.Butterfly valve number and exhausting point are corresponding, for example are provided with dust hood 13 behind 9,2 stoves of 2 stokehold dust hoods, and butterfly valve 12 behind 7,2 stoves of 2 stokehold butterfly valves then need be set.General ventilating shaft 5 air outlets only need be provided with a vertical shaft dust hood 3, and vertical shaft butterfly valve 2 is set directly in the ventilating shaft cleaning shaft 1, can whether extract ventilating shaft 5 interior flue gases by the open and close controlling of vertical shaft butterfly valve 2 to sack cleaner 16.
The switching of butterfly valve 12, vertical shaft butterfly valve 2 and blinds valve 4 can be adopted artificial or automatic control forms behind stokehold butterfly valve 7, the stove, and automatic control is the interior air-flow of regulation system accurately, helps guaranteeing dust removing effects.Therefore the utility model provides further technical scheme: the automatic control equipment that butterfly valve 12 behind control stokehold butterfly valve 7, the stove, vertical shaft butterfly valve 2 and blinds valve 4 open and close is set.During concrete enforcement, automatic control equipment can adopt programmable logic controller (Programmable Logic Controller, PLC) realize, it can be arranged on the remote control center beyond the factory building, and set up control signal behind stokehold butterfly valve 7, the stove between butterfly valve 12, vertical shaft butterfly valve 2 and the blinds valve 4 and be connected and get final product.Adopting automatic control equipment, directly operated by the data that collect, is a kind of very simple and effective scheme on the concrete industrial application of dust-removal system.PLC has functions such as switching value processing, analog quantity processing and motion control, has replaced since the traditional relay control device, is widely used at automation field.Under this automatic control situation, butterfly valve 12, vertical shaft butterfly valve 2 and blinds valve 4 all need to adopt electrical equipment to realize behind stokehold butterfly valve 7, the stove, wherein if butterfly valve 12 used electrical equipments then can be realized dust removal process more accurately by automatic control can Be Controlled aperture size behind stokehold butterfly valve 7, the stove.If butterfly valve is undesirable behind the used stokehold of original converter secondary flue gas dust-removal system butterfly valve, the stove, then need to change and transform, this replacing is also also uncomplicated.
In the existing converter secondary flue gas dust-removal system, convert molten steel for convenience and go out molten steel, general moving door 14 after being provided with stokehold moving door 8 and stove on the enclosed hood also, and adopt moving of moving door 14 behind stokehold control center control stokehold moving door 8 and the stove.Stokehold control center operated by rotary motion at power house 6 with interior watch-keeping cubicle, stokehold, adopt the computer realization of storage control program, computer is according to the converter working routine of setting, cooperate hot metal charging, converter works better, go out working stage such as molten steel, the switching of moving door 14 behind moving door 8 and the stove before sending control signal and realizing.Automatic control equipment that the utility model provides can and stokehold control center between establish a communications link, realize the interlock that stokehold control and dedusting are controlled, more perfect control scheme is provided.For the ease of implementing, the detailed implementation process that the utility model provides this embodiment for your guidance:
(1) in order to make vertical shaft dedusting exhausting amount suitable, before definite exhausting amount, the air quantity when test or calculating ventilating shaft 5 do not have dedusting natural convection.Because when vertical shaft exhausting amount is excessive, because this system's exhausting amount is certain, the exhausting amount behind this moment stokehold or the stove is just little, influences the dust removing effects behind stokehold or the stove.When vertical shaft exhausting amount is too small, the air quantity when promptly vertical shaft exhausting amount does not have the dedusting normal convection less than vertical shaft, this moment, ventilating shaft 5 interior flue gases can not in time be taken away, backflow phenomenon can occur, and flue gas can disperse in factory building.When measuring air quantity, the shaft section area district can be divided into some little zones (it is accurate more to get thin more test result), measure wind speed in each zonule with hot-bulb anemoscope or other surveying instrument then, the convection current air quantity when calculating vertical shaft and not having dedusting of averaging after testing.Be stressed that especially, when enclosed hood is opened hot metal charging or is gone out molten steel, air quantity when the convection current air quantity is not opened converter 11 normal smeltings than enclosed hood in the vertical shaft is big, so convection current air quantity in the vertical shaft that the air quantity of test must be an enclosed hood when opening hot metal charging or going out molten steel; If in enclosed hood is opened once time, do not finish surveying work, then to wait until when enclosed hood is opened next time and then measure again, finish up to measurement.At last, convection current air quantity in convection current air quantity and the vertical shaft when going out molten steel in the vertical shaft during hot metal charging relatively determines that maximum value among both is as convection current air quantity Q1 in the vertical shaft.When determining the air quantity of normal convection in the vertical shaft by calculation mode, also be when determining that enclosed hood is opened hot metal charging or gone out molten steel the maximum value of the convection current air quantity in the vertical shaft among both as convection current air quantity Q1 in the vertical shaft.Behind the air quantity when having determined normal convection in the vertical shaft, could determine vertical shaft dedusting exhausting amount Q2.According to experiment, general desirable Q2=K*Q1, K 〉=1.2.
(2) open converter 11 and dump forward when preparing the control signal of hot metal charging when automatic control equipment receives the stokehold moving door 8 that sends from stokehold control center, the program that PLC finishes according to inside is sent instruction closes two blinds valves 4, vertical shaft butterfly valve 2 standard-sized sheet vertical shafts begin exhausting, butterfly valve 12 cuts out behind two stoves, and two stokehold butterfly valve 7 apertures are adjusted to the size minimizing stokehold exhausting amount of setting.Because when converter 11 dumps forward hot metal charging, the flue gas that produces mainly concentrates on the enclosed hood forebody, and most of flue gas rises with hot gas flow and has entered ventilating shaft 5, stop exhausting behind the stove so close behind two stoves butterfly valve 12, turn two stokehold butterfly valve 7 apertures down minimizing stokehold exhausting amount, and guarantee ventilating shaft 5 dedusting exhausting amounts.This moment, secondary BOF dedusting system exhausting amount reduced, and wind speed can be very low in original converter secondary flue gas cleaning shaft 15, and sedimentation phenomenon can appear in dust in pipe; Only continue about 3 minutes because this kind exhausting state is each, dust sedimentation in pipe is limited, when before the converter 11 normal smelting furnaces and behind the stove during normal exhausting, is deposited in and manages interior low amounts of dust and can be taken away by air-flow, can not stop up converter secondary flue gas cleaning shaft 15.
(3) when receiving the hot metal charging that sends from the stokehold control center stokehold moving door 8 that finishes, automatic control equipment closes converter 11 when fascinating back the control signal of zero-bit (fire door vertically upward), the normal exhausting of aperture when the program that PLC finishes according to inside is sent aperture size adjustment that instruction makes butterfly valve 12 behind two stokehold butterfly valves 7 and two stoves to normal smelting is carried out the secondary flue gas dedusting, vertical shaft butterfly valve 2 cuts out stop the vertical shaft exhausting, make two blinds valve 4 standard-sized sheets simultaneously, allow ventilating shaft 5 natural convections discharge.Because the interior gas dustiness of vertical shaft is little during converter 11 normal smeltings, reach emission standard, can discharge naturally.
(4) moving door 14 is opened converter 11 when toppling over the control signal of preparing out molten steel backward after automatic control equipment receives the stove that sends from stokehold control center, the program that PLC finishes according to inside is sent instruction closes two blinds valves 4, vertical shaft butterfly valve 2 standard-sized sheets, beginning vertical shaft exhausting, two stokehold butterfly valves 7 cut out, and the size that butterfly valve 13 apertures are adjusted to setting behind two stoves reduces exhausting amount behind the stove.Because converter 11 retreats when pouring out molten steel, it is latter half of that the flue gas that produces mainly concentrates on enclosed hood, and most of flue gas rises with hot gas flow and has entered ventilating shaft 5, stop exhausting behind the stove so close two stokehold butterfly valves 7, butterfly valve 13 apertures behind two stoves are turned down reduce exhausting amount behind the stove, and guarantee ventilating shaft 5 dedusting exhausting amounts.This moment, secondary BOF dedusting system exhausting amount reduced, and wind speed can be very low in original converter secondary flue gas cleaning shaft 15, and sedimentation phenomenon can appear in dust in pipe; Only continue about 3 minutes because this kind exhausting state is each, dust sedimentation in pipe is limited, when before the converter 11 normal smelting furnaces and behind the stove during normal exhausting, is deposited in and manages interior low amounts of dust and can be taken away by air-flow, can not stop up converter secondary flue gas cleaning shaft 15.
Claims (5)
1. dust-removal system that is used for ventilating shaft and converter secondary flue gas, comprise converter secondary flue gas dust-removal system, described converter secondary flue gas dust-removal system is provided with converter secondary flue gas dedusting enclosed hood, the stokehold dust hood, dust hood behind the stove, converter secondary flue gas cleaning shaft, sack cleaner, blower motor and chimney, dust hood is arranged on the converter secondary flue gas dedusting enclosed hood behind stokehold dust hood and the stove, dust hood inserts sack cleaner through converter secondary flue gas cleaning shaft behind stokehold dust hood and the stove, sack cleaner and blower motor, chimney connects successively, it is characterized in that: at the ventilating shaft air outlet vertical shaft dust hood and blinds valve are set, the position seals of ventilating shaft air outlet except that vertical shaft dust hood and blinds valve; The ventilating shaft cleaning shaft is set, and ventilating shaft cleaning shaft one end connects the vertical shaft dust hood, and the other end inserts converter secondary flue gas cleaning shaft.
2. dust-removal system as claimed in claim 1 is characterized in that: between stokehold dust hood and the converter secondary flue gas cleaning shaft stokehold butterfly valve is set, butterfly valve behind the stove is set between dust hood and the converter secondary flue gas cleaning shaft behind the stove; The vertical shaft butterfly valve is set in the ventilating shaft cleaning shaft.
3. dust-removal system as claimed in claim 2 is characterized in that: the automatic control equipment that butterfly valve behind control stokehold butterfly valve, the stove, vertical shaft butterfly valve and blinds valve open and close is set.
4. dust-removal system as claimed in claim 3 is characterized in that: described automatic control equipment adopts programmable logic controller.
5. as claim 3 or 4 described dust-removal systems, it is characterized in that: described converter secondary flue gas dedusting enclosed hood is provided with moving door behind the stokehold moving door that is subjected to stokehold control center control and the stove; Set up between described automatic control equipment and the stokehold control center and communicate by letter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200833293U CN201343547Y (en) | 2009-01-09 | 2009-01-09 | Dust removal system for secondary flue gas in ventilation shaft and revolving furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200833293U CN201343547Y (en) | 2009-01-09 | 2009-01-09 | Dust removal system for secondary flue gas in ventilation shaft and revolving furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201343547Y true CN201343547Y (en) | 2009-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009200833293U Expired - Fee Related CN201343547Y (en) | 2009-01-09 | 2009-01-09 | Dust removal system for secondary flue gas in ventilation shaft and revolving furnace |
Country Status (1)
| Country | Link |
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| CN (1) | CN201343547Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106978518A (en) * | 2017-05-23 | 2017-07-25 | 中冶华天工程技术有限公司 | The simple third dedusting system and method for converter based on a tank |
| CN107794338A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of automatically controlled butterfly valve control method of secondary BOF dedusting system |
| CN109132615A (en) * | 2017-10-30 | 2019-01-04 | 中国安全生产科学研究院 | Cement car loading operation ventilating dust-arrester |
| CN111575436A (en) * | 2020-05-22 | 2020-08-25 | 广东韶钢松山股份有限公司 | Dust removal method |
-
2009
- 2009-01-09 CN CNU2009200833293U patent/CN201343547Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107794338A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of automatically controlled butterfly valve control method of secondary BOF dedusting system |
| CN106978518A (en) * | 2017-05-23 | 2017-07-25 | 中冶华天工程技术有限公司 | The simple third dedusting system and method for converter based on a tank |
| CN109132615A (en) * | 2017-10-30 | 2019-01-04 | 中国安全生产科学研究院 | Cement car loading operation ventilating dust-arrester |
| CN111575436A (en) * | 2020-05-22 | 2020-08-25 | 广东韶钢松山股份有限公司 | Dust removal method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: WUHAN HONGCHUANG ENVIRONMENTAL PROTECTION TECHNOLO Free format text: FORMER OWNER: KINGHOME ENVIRONMENT TECHNOLOGIES (CHINA) LTD. Effective date: 20110124 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 430062 1603, TOWER B, KAIXUANMEN PLAZA, NO. 7, XUDONG STREET, WUCHANG, WUHAN CITY, HUBEI PROVINCE TO: 430061 A1503, 2008 NEW YANGTZE RIVER PLAZA, NO. 2, YOUYI AVENUE, WUCHANG DISTRICT, WUHAN CITY, HUBEI PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20110124 Address after: 430061, 2008 New Friendship Plaza, No. 2 Youyi Avenue, Wuchang District, Hubei, Wuhan A1503 Patentee after: Wuhan Hongchuang Environmental Protection Technology Co., Ltd. Address before: 430062, B, block 1603, Triumphal Arch square, 7 East Avenue, Wuchang, Hubei, Wuhan Patentee before: Wuhan Jinghong Environmental Protection Technology Co., Ltd. |
|
| C56 | Change in the name or address of the patentee |
Owner name: KINGHOME ENVIRONMENTAL TECHNOLOGIES(CHINA) CO., LT Free format text: FORMER NAME: WUHAN HONGCHUANG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 430061, 2008 New Friendship Plaza, No. 2 Youyi Avenue, Wuchang District, Hubei, Wuhan A1501 Patentee after: Kinghome Environmental Technologies Co., Ltd. Address before: 430061, 2008 New Friendship Plaza, No. 2 Youyi Avenue, Wuchang District, Hubei, Wuhan A1503 Patentee before: Wuhan Hongchuang Environmental Protection Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091111 Termination date: 20150109 |
|
| EXPY | Termination of patent right or utility model |