CN101539371B - First flue gas dust removal and waste heat recovery system for electric stove - Google Patents

First flue gas dust removal and waste heat recovery system for electric stove Download PDF

Info

Publication number
CN101539371B
CN101539371B CN2009100498196A CN200910049819A CN101539371B CN 101539371 B CN101539371 B CN 101539371B CN 2009100498196 A CN2009100498196 A CN 2009100498196A CN 200910049819 A CN200910049819 A CN 200910049819A CN 101539371 B CN101539371 B CN 101539371B
Authority
CN
China
Prior art keywords
flue gas
heat recovery
waste
dust
communicated
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.)
Expired - Fee Related
Application number
CN2009100498196A
Other languages
Chinese (zh)
Other versions
CN101539371A (en
Inventor
王永忠
沈晓红
朱军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baosteel Engineering and Technology Group Co Ltd
Original Assignee
Baosteel Engineering and Technology Group Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Baosteel Engineering and Technology Group Co Ltd filed Critical Baosteel Engineering and Technology Group Co Ltd
Priority to CN2009100498196A priority Critical patent/CN101539371B/en
Publication of CN101539371A publication Critical patent/CN101539371A/en
Application granted granted Critical
Publication of CN101539371B publication Critical patent/CN101539371B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Abstract

The invention relates to a first flue gas dust removal and waste heat recovery system for an electric stove. The system is connected with the smoke hole of the electric stove and comprises a water cooling travelling tube, a combustor and a water cooling flue gas path, and the system also comprises a high temperature resistant dust remover, a waste heat recovery device, a dust removal fan and a chimney. The outlet of the combustor is communicated with the smoke hole of the electric stove by the water cooling travelling tube and the outlet of the combustor is communicated with the high temperature resistant dust remover by the water cooling flue gas path. The outlet of the high temperature resistant dust remover is communicated with the inlet pipeline of the waste heat recovery device, thus the flue gas after dust removal can be sent into the waste heat recovery device. The outlet of the waste heat recovery device is communicated with the chimney by the fan, and the waste heat recovery device is used for absorbing the heat of the flue gas. The dust removal fan is arranged on the pipeline between the waste heat recovery device and the chimney. The system of the invention has the advantages of high dust removal efficiency, strong operability, safe and steady operation, low energy consumption and steam recovery, thus realizing flue gas emission reduction and energy conversation of the electric stove.

Description

First flue gas dust-removal and residual neat recovering system
Technical field
The present invention relates to the industrial furnace flue gas and handle and the recuperation of heat field particularly a kind of high-temperature flue gas one-time dedusting and residual neat recovering system that is applied in the metallurgical steel mill EAF Steelmaking Process.
Background technology
Steel mill's electric furnace rhythm of production is generally accelerated at present, and the hot metal charging ratio strengthens, and exhaust gas volumn increases considerably when causing electric furnace smelting thus.For electric stove dust, be mainly concerned with the disposable problem of electric furnace flue gas waste heat recovery and waste heat.
Existing most electric furnace flue gas waste heat does not reclaim, and the flue gas final dusting when high-temperature flue gas one-time dedusting that produces when adopting electro-smelting and electric furnace charging, tapping merges the cover electric stove dust system that is set to.Wherein, a high-temperature flue gas of discharging from the electric furnace steam vent during electro-smelting, adopting lowers the temperature earlier cools off, the mode of back dedusting.High-temperature flue gas adopts secondary cooling usually, promptly adopts water-cooled flue once to cool off and adopts the air blast cooling device or natural air cooling device secondary cools off.But in this mode, electric furnace high-temperature flue gas waste heat does not obtain reclaiming, and has therefore caused the waste of heat energy.
At present, the electric furnace flue gas of only a few has adopted waste heat recovery reluctantly.For example: a high-temperature flue gas more than 1400 ℃ of discharging from the electric furnace steam vent during with electro-smelting; Adopt and to sneak into a large amount of air earlier and be cooled to below 700 ℃, then with heat pipe waste heat boiler recovered steam, the cooled flue gas of cooling with electric furnace charging and the secondary flue gas when tapping mix after dedusting again.But in this mode; Wasted very big energy and made system become huge because of sneaking into a large amount of air; The what is more important electric furnace flue gas is without dedusting; Contain a large amount of trickle caking property dust in the high-temperature gas and also will be bonded on the heat pipe heating surface, thereby increased maintenance workload and running resistance, reduced the heat transfer efficiency and the service life of heat pipe heating surface simultaneously.
Summary of the invention
In order to overcome the defective of above-mentioned prior art; Task of the present invention is to provide a kind of first flue gas dust-removal and residual neat recovering system; It has solved above-mentioned existing in prior technology problem; Possessed flue gas ash removal and the function that reclaims flue gas heat energy simultaneously, and have that flue gas ash removal efficient is high, workable, security of system stable operation, advantage that energy consumption is low.
Technical solution of the present invention is following:
A kind of first flue gas dust-removal and residual neat recovering system; Connect the electric furnace exhaust smoke hole; Said system comprises that a water-cooled moves pipe, a combustion chamber, a water-cooled flue, and said system also comprises a high temperature resistant dust collector, a waste-heat recovery device, a dedusting fan and a chimney;
The inlet of said combustion chamber moves pipe through water-cooled and is communicated with the electric furnace exhaust smoke hole, and the outlet of combustion chamber is communicated with high temperature resistant dust collector through water-cooled flue;
The outlet of said high temperature resistant dust collector is communicated with the inlet duct of waste-heat recovery device, makes the flue gas after the dedusting send into waste-heat recovery device;
The outlet of said waste-heat recovery device is communicated with chimney through blower fan, and waste-heat recovery device absorbs the heat of flue gas;
Said dedusting fan is installed on the pipeline between waste-heat recovery device and the chimney.
The present invention takes following further technical measures:
Said first flue gas dust-removal and residual neat recovering system also comprise: a bypass pipe, and its two ends are communicated with the pipeline of waste-heat recovery device entrance and exit respectively; And a transfer valve, be arranged on the bypass pipe, to open and close bypass pipe.
Said first flue gas dust-removal and residual neat recovering system also comprise: a pressure-regulating valve is arranged on the inlet duct of waste-heat recovery device, with the pressure of control electric furnace fire door.
Said high temperature resistant dust collector comprises: an attemperator and a filter, a pulse spraying equipment, an ash-discharging device, a control device and the connecting line between them; Said attemperator is installed on the deduster housing, and filter is to filter by the outer dust in flue gas of passing towards filter bag inside of filter bag equably; The enabled instruction that said pulse spraying equipment receiving control device sends is carried out automatic ash removing to filter bag; Said ash-discharging device is communicated to the bottom of high temperature resistant dust collector to collect dust.
Said high temperature resistant dust collector also comprises: the grey storehouse of a storage connects ash-discharging device, to store dust.
Said first flue gas dust-removal and residual neat recovering system also comprise: a frequency converter connects dedusting fan, with the rotating speed of control dedusting fan.
Said waste-heat recovery device means cooling wall membrane type waste heat boiler, or heat pipe waste heat boiler, or mixes the combined type waste heat boiler of fuel burning.
Said combustion chamber can be replaced by an expansion chamber that makes big dust particle in the gas obtain sedimentation.
Adopt first flue gas dust-removal of the present invention and residual neat recovering system, both met strict environmental protection requirement, again can recovered steam, realize that electric furnace flue gas reduces discharging with energy-conservation.
The present invention makes it compared with prior art owing to adopted above technical scheme and technical measures, has the following advantages and positive effect:
First flue gas dust-removal of the present invention and residual neat recovering system compared with prior art have that flue gas ash removal efficient is high, workable, security of system stable operation, energy consumption is low, also the advantage of recyclable steam.System of the present invention has saved secondary cooling device expense such as air blast cooling device or natural air cooler in the prior art; Very suitable electric furnace is set up waste-heat recovery device; Efficiency of dust collection is high, and the fume emission dust content behind high temperature resistant dust collector is stabilized in 20mg/ mark m 3Below; Amount of steam withdrawn is high, and electric furnace ton steel amount of steam withdrawn is on average more than 80kg.In addition, system of the present invention also is provided with bypass pipe, can adapt to the needs that electric furnace working conditions change and waste heat boiler plant maintenance do not influence environmental protection and electric furnace production.
Description of drawings
Accompanying drawing is a kind of first flue gas dust-removal of the present invention and residual neat recovering system sketch map.
Drawing reference numeral:
1 is the electric furnace exhaust smoke hole, and 2 for water-cooled moves pipe, and 3 is the combustion chamber, and 4 is water-cooled flue; 5 is high temperature resistant dust collector, and 6 is pressure-regulating valve, and 7 is waste-heat recovery device, and 8 is bypass pipe; 9 transfer valves, 10 is dedusting fan, and 11 is frequency converter, and 12 is chimney; 13 is ash-discharging device, and 14 are the grey storehouse of storage, and 15 are the control system.
The specific embodiment
Come specifically to introduce a preferred embodiment of the present invention below in conjunction with accompanying drawing.
Referring to accompanying drawing; First flue gas dust-removal of the present invention is connected electric furnace exhaust smoke hole 1 with residual neat recovering system, said system moves pipe 2, one combustion chamber 3, a water-cooled flue 4, a high temperature resistant dust collector 5, a pressure-regulating valve 6, a waste-heat recovery device 7, a bypass pipe 8, a transfer valve 9, a dedusting fan 10, a frequency converter 11 and a chimney 12 by a water-cooled and forms.
Wherein, the inlet of combustion chamber 3 moves pipe 2 through water-cooled and is communicated with electric furnace exhaust smoke hole 1, and the outlet of combustion chamber 3 is communicated with high temperature resistant dust collector 5 through water-cooled flue 4.High temperature resistant dust collector 5 outlets are communicated with the inlet duct of waste-heat recovery device 7, and the flue gas after the dedusting is sent into waste-heat recovery device 7.Pressure-regulating valve 6 is arranged on the inlet duct of waste-heat recovery device 7, and is positioned at before the inlet of waste-heat recovery device 7, with control electric furnace fire door pressure.The outlet of waste-heat recovery device 7 is communicated with chimney 12 through blower fan 10, and waste-heat recovery device 7 absorbs the heat of flue gas.Dedusting fan 10 is installed on the pipeline between waste-heat recovery device 7 and the chimney 12.Frequency converter 11 connects dedusting fan 10, with the rotating speed of control dedusting fan 10.The two ends of bypass pipe 8 are communicated with the pipeline of waste-heat recovery device 7 entrance and exits respectively, and bypass pipe is set, and can adapt to the variation of electric furnace operating mode and the needs that the waste heat boiler plant maintenance does not influence environmental protection and electric furnace production.Transfer valve 9 is arranged on the bypass pipe 8, to open and close bypass pipe 8.
Above-mentioned combustion chamber 3 can be replaced by an expansion chamber that makes big dust particle in the gas obtain sedimentation.
Said waste-heat recovery device 7 means cooling wall membrane type waste heat boiler, or heat pipe waste heat boiler, or mixes combined type waste heat boiler of fuel burning etc.
High temperature resistant dust collector 5 of the present invention is made up of the grey storehouse of an insulation and filter, a pulse spraying equipment, an ash-discharging device 13, a storage 14, a control system 15 and the connecting line between them.The deduster housing is provided with attemperator, and filter filters by the outer dust in flue gas of passing towards filter bag inside of filter bag equably.The enabled instruction that pulse spraying equipment receiving control system 15 sends is carried out automatic ash removing to filter bag.Ash-discharging device 13 is communicated to the bottom of high temperature resistant dust collector 5, to collect dust.Store grey storehouse 14 and connect ash-discharging device 13, to store dust.In the present embodiment, the filter bag of high temperature resistant dust collector 5 adopts special high temperature resistance filtration material to process.
The operating process of first flue gas dust-removal of the present invention and residual neat recovering system is following:
Electric furnace is at about 1400 ℃ of high temperature dust gases of melting generation in period; Get into water-cooled by the exhaust smoke hole on the electric furnace 1 and move pipe 2; Combustion chamber 3 or expansion chamber make the gas-fired in the high-temperature gas, make the big dust particle in the gas obtain sedimentation, get into water-cooled flue 4 again and are cooled to about 600 ℃; Get into high temperature resistant dust collector 5 purifying and dedustings then; Clean gas after the dedusting gets into waste-heat recovery device 7, in recovered steam, gas outlet temperature is controlled at about 200 ℃, inserts chimney 12 qualified discharges by dedusting fan 10 at last.
In the high temperature resistant dust collector 5, dusty gas is outer when filter bag inside is passed by filter bag equably, and dust is trapped in outer surface by filter bag and clean gas is passed through filter bag; Along with thickening of filter bag outer surface dust layer; High temperature resistant dust collector 5 running resistances rise, and the control system detects Resistance Value, when resistance reaches going up in limited time of setting value; Control system starting impulse spraying and blowing organ carries out automatic ash removing with compressed air or nitrogen; Dust is stripped from and is fallen into the bottom ash bucket and unloads ash, enters ash-discharging device 13 to the grey storehouse 14 of storage, is loaded, transports by the cleaning truck then.
The granular material discharged concentration of the electric furnace flue gas after the embodiment of the present invention technology is marked m at 20mg/ 3Below, system's running resistance is below 5kPa, and electric furnace ton steel amount of steam withdrawn is on average more than 80kg.
Technology of the present invention is applicable to the flue gas ash removal and the waste heat recovery of newly-built electric furnace project.Take: first flue gas dust-removal and residual neat recovering system are arranged with electric furnace flue gas final dusting system branch.The main water-cooled flue 4 that adopts is connected with high temperature resistant dust collector 5, and high temperature resistant dust collector 5 is connected with waste-heat recovery device 7, and waste-heat recovery device 7 is connected with dedusting fan 10; Bypass pipe 8 is set; Before waste-heat recovery device 7 inlets, pressure-regulating valve 6 is set, with control electric furnace fire door pressure; Dedusting fan 10 adopts the arrangements for speed regulation of frequency converter 11 or coupling device etc.
First flue gas dust-removal of the present invention and residual neat recovering system are particularly useful for the technological transformation of existing electric stove dust system and set up waste heat recovery.Take one-time dedusting systematic pipeline and equipment method of separating from existing electric stove dust system: the deduster and the blower fan of existing electric stove dust system will be served the electric furnace final dusting; Remove air blast cooling device or equipment such as natural air cooling device and booster fan in the existing electric furnace one-time dedusting, keep existing water-cooled and move pipe 2 and combustion chamber 3 or expansion chamber and water-cooled flue 4.Newly-increased: the arrangements for speed regulation of high temperature resistant dust collector 5, pressure-regulating valve 6, waste-heat recovery device 7, bypass pipe 8, transfer valve 9, dedusting fan 10, frequency converter 11 or fluid-flywheel clutch, chimney 12, ash-discharging device 13, the grey storehouse 14 of storage and control system 15 etc.; Just can constitute first flue gas dust-removal of the present invention and residual neat recovering system fast, economically; Flue gas is carried out dedusting; Absorb the after-heat of flue gas simultaneously, make full use of resource.
Certainly; Those skilled in the art in the present technique field will be appreciated that; The foregoing description only is to be used for explaining the present invention; And be not with opposing qualification of the present invention, as long as in connotation scope of the present invention, all will drop in the scope of claim of the present invention conversion, the modification of the foregoing description.

Claims (7)

1. first flue gas dust-removal and residual neat recovering system; Connect the electric furnace exhaust smoke hole; Said system comprises that a water-cooled moves pipe, a combustion chamber, a water-cooled flue, it is characterized in that said system also comprises a high temperature resistant dust collector, a waste-heat recovery device, a dedusting fan and a chimney;
Said high temperature resistant dust collector comprises: an attemperator and a filter, a pulse spraying equipment, an ash-discharging device, a control device and the connecting line between them;
Said attemperator is installed on the deduster housing, and filter is to filter by the outer dust in flue gas of passing towards filter bag inside of filter bag equably;
The enabled instruction that said pulse spraying equipment receiving control device sends is carried out automatic ash removing to filter bag;
Said ash-discharging device is communicated to the bottom of high temperature resistant dust collector to collect dust;
The inlet of said combustion chamber moves pipe through water-cooled and is communicated with the electric furnace exhaust smoke hole, and the outlet of combustion chamber is communicated with high temperature resistant dust collector through water-cooled flue;
The outlet of said high temperature resistant dust collector is communicated with the inlet duct of waste-heat recovery device, makes the flue gas after the dedusting send into waste-heat recovery device;
The outlet of said waste-heat recovery device is communicated with chimney through blower fan, and waste-heat recovery device absorbs the heat of flue gas;
Said dedusting fan is installed on the pipeline between waste-heat recovery device and the chimney.
2. first flue gas dust-removal according to claim 1 and residual neat recovering system is characterized in that, said system also comprises:
One bypass pipe, its two ends are communicated with the pipeline of waste-heat recovery device entrance and exit respectively; And
One transfer valve is arranged on the bypass pipe, to open and close bypass pipe.
3. first flue gas dust-removal according to claim 1 and residual neat recovering system is characterized in that, said system also comprises: a pressure-regulating valve is arranged on the inlet duct of waste-heat recovery device, with the pressure of control electric furnace fire door.
4. first flue gas dust-removal according to claim 1 and residual neat recovering system is characterized in that, said high temperature resistant dust collector also comprises: the grey storehouse of a storage connects ash-discharging device, to store dust.
5. first flue gas dust-removal according to claim 1 and residual neat recovering system is characterized in that, said system also comprises: a frequency converter connects dedusting fan, with the rotating speed of control dedusting fan.
6. first flue gas dust-removal according to claim 1 and residual neat recovering system is characterized in that, said waste-heat recovery device means cooling wall membrane type waste heat boiler, or heat pipe waste heat boiler, or mix the combined type waste heat boiler of fuel burning.
7. first flue gas dust-removal according to claim 1 and residual neat recovering system is characterized in that, said combustion chamber can be replaced by an expansion chamber that makes big dust particle in the gas obtain sedimentation.
CN2009100498196A 2009-04-23 2009-04-23 First flue gas dust removal and waste heat recovery system for electric stove Expired - Fee Related CN101539371B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009100498196A CN101539371B (en) 2009-04-23 2009-04-23 First flue gas dust removal and waste heat recovery system for electric stove

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009100498196A CN101539371B (en) 2009-04-23 2009-04-23 First flue gas dust removal and waste heat recovery system for electric stove

Publications (2)

Publication Number Publication Date
CN101539371A CN101539371A (en) 2009-09-23
CN101539371B true CN101539371B (en) 2012-07-04

Family

ID=41122685

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2009100498196A Expired - Fee Related CN101539371B (en) 2009-04-23 2009-04-23 First flue gas dust removal and waste heat recovery system for electric stove

Country Status (1)

Country Link
CN (1) CN101539371B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101749963B (en) * 2010-01-22 2013-01-30 无锡市东方环境工程设计研究所有限公司 Electric furnace bidirectional movement flue synchronizing device
CN101726193B (en) * 2010-01-22 2012-10-31 无锡市东方环境工程设计研究所有限公司 Synchronizer for bidirectional-movement smoke exhaust pipe of electric furnace
CN102600671A (en) * 2012-03-28 2012-07-25 苏州宇洋环保设备制造有限公司 Dust collecting device of bag dust collector
CN103884199A (en) * 2014-04-09 2014-06-25 中冶北方(大连)工程技术有限公司 Sintering exhaust gas emission reduction treatment process and system
CN104197694A (en) * 2014-09-26 2014-12-10 孙慕文 Protecting device for flue gas ducts of electric arc furnace
CN104457301A (en) * 2014-12-28 2015-03-25 大连华锐重工集团股份有限公司 Furnace gas sensible heat utilization system of airtight submerged arc furnace
CN105057099B (en) * 2015-07-31 2017-07-11 湖州杨氏塑料助剂有限公司 Produce MBS exhaust gas processing device
CN105381665A (en) * 2015-11-09 2016-03-09 红河绿地环保科技发展有限公司 High temperature classification filtration treating method for smelting dust
CN110028224B (en) * 2019-03-19 2020-01-10 东旭科技集团有限公司 Kiln system for producing carrier plate glass

Also Published As

Publication number Publication date
CN101539371A (en) 2009-09-23

Similar Documents

Publication Publication Date Title
CN101539371B (en) First flue gas dust removal and waste heat recovery system for electric stove
CN101539369B (en) Flue gas waste heat recovery and negative energy consumption dust-removal system for electric stove
CN201574162U (en) Converter flue gas complementary-energy generating system with gas combustion device
CN201179403Y (en) Heat recovering device and dust removing system with the heat recovering device
CN101736117B (en) Converter fume high-temperature bag dust removal and recycling and secondary steam recycling system
CN1966730A (en) Method for treating converter flue gas
CN103627844B (en) Coal gas of converter direct combustion energy recovery purification system and technique
CN101539370B (en) First flue gas dust-removal and waste heat recovery system for electric stove without water cooling flue gas path
CN103255260A (en) Converter flue gas purifying and waste heat recovering system and bag-type dust removing technology
CN100513962C (en) Smoke removing, temp lowering, afterheat using and recovering system in arc furnace and its dust removing technology
CN102878822A (en) Device and method for purifying and recycling furnace gas of hermetic ore smelting furnace
CN102183155A (en) Smoke high-temperature dust removal and steam and coal gas recovery system and method for calcium carbide furnace
CN201176445Y (en) Converter coal gas high-temperature exhaust dust device with bag
CN102321779B (en) Converter smoke radiation type waste heat boiler recovery system
CN101851695A (en) Dry bag-type coal gas purifying and recycling process for oxygen-resistant converter
CN103961955A (en) Preheating process of dust remover for filtering combustible dusty gas
CN209210852U (en) The purification of converter gas pure dry type and waste heat depth recovery system
CN207703012U (en) Mineral hot furnace coal-gas recovering utilizes equipment
CN104006672A (en) Method for smoke discharging and dedusting of steel making electric furnace
CN108823352A (en) A kind of converter gas dry type waste heat recycling dust-extraction unit and method
CN103528388A (en) Closed ferroalloy furnace coal gas dry method purification and recovery system
CN205170757U (en) Power generation system
CN107987892A (en) Mineral hot furnace coal-gas recovering Application way and equipment
CN203625414U (en) Dry cloth-bag dust removal device for carbon steel converter capable of recovering waste heat in whole process
CN107447072A (en) A kind of steelmaking converter flue gas dust collecting system

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
C41 Transfer of patent application or patent right or utility model
TA01 Transfer of patent application right

Effective date of registration: 20100719

Address after: 201900 Shanghai city Baoshan District Tieli Road No. 2510

Applicant after: Baosteel Engeneering &Technology Group Co., Ltd.

Address before: 201900 Shanghai city Baoshan District Tieli Road No. 2510

Applicant before: Shanghai Baogang Engineering Technology Co., Ltd.

Effective date of registration: 20100719

Address after: 201900 Shanghai city Baoshan District Tieli Road No. 2510

Applicant after: Baosteel Engeneering &Technology Group Co., Ltd.

Address before: 201900 Shanghai city Baoshan District Tieli Road No. 2510

Applicant before: Shanghai Baogang Engineering Technology Co., Ltd.

ASS Succession or assignment of patent right

Owner name: BAOSTEEL ENGINEERING + TECHNOLOGY GROUP CO., LTD

Free format text: FORMER OWNER: BAOGANG ENGINEERING TECHN CO., LTD., SHANGHAI

Effective date: 20100719

C14 Grant of patent or utility model
GR01 Patent grant
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: 20120704

Termination date: 20190423