CN106319118B - Method for prolonging service life of blast furnace copper cooling wall - Google Patents
Method for prolonging service life of blast furnace copper cooling wall Download PDFInfo
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- CN106319118B CN106319118B CN201510337015.1A CN201510337015A CN106319118B CN 106319118 B CN106319118 B CN 106319118B CN 201510337015 A CN201510337015 A CN 201510337015A CN 106319118 B CN106319118 B CN 106319118B
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- stave
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- 238000001816 cooling Methods 0.000 title claims abstract description 122
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 110
- 239000010949 copper Substances 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002893 slag Substances 0.000 claims abstract description 49
- 239000002826 coolant Substances 0.000 claims abstract description 14
- 238000009423 ventilation Methods 0.000 claims abstract description 8
- 238000004364 calculation method Methods 0.000 claims abstract description 7
- 239000003507 refrigerant Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 11
- 238000012546 transfer Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000005057 refrigeration Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 239000008234 soft water Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 230000007774 longterm Effects 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 230000017525 heat dissipation Effects 0.000 abstract 1
- 238000000746 purification Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000000498 cooling water Substances 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 5
- 229910001018 Cast iron Inorganic materials 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 238000013528 artificial neural network Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 208000021760 high fever Diseases 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- 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
- Y02P10/20—Recycling
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- Blast Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a method for prolonging the service life of a copper cooling wall of a blast furnace, which is used for effectively protecting the copper cooling wall of the blast furnace. The method comprises the following steps: the hot surface temperature of the copper cooling wall of the blast furnace can be obtained by the hot surface temperature calculation system; the system for judging the thickness of the slag crust on the hot surface of the copper cooling wall of the blast furnace can judge whether the slag crust with a certain thickness needs to be quickly established to protect the copper cooling wall; the blast furnace copper cooling wall refrigerating system forcibly cools the blast furnace copper cooling wall needing to be protected, so that the hot surface of the copper cooling wall is quickly provided with effective slag crust; and the ventilation and purification device and the control system are responsible for completing the ventilation and heat dissipation of the whole system and the liquefaction circulation process of the cooling medium. Compared with the prior art, the invention relieves the contradiction that the copper cooling wall of the blast furnace is quick to damage and is not easy to replace in the past, and further improves the first-generation furnace service of the blast furnace. Moreover, the invention can reduce the temperature fluctuation of the blast furnace hearth caused by the abnormal falling of the slag skin of the copper cooling wall of the blast furnace and ensure the long-term stable and smooth running of the blast furnace.
Description
Technical field
The present invention relates to prolonging campaign technology, especially a kind of method for extending blast furnace copper cooling stave service life, belong to
Field of metallurgy.
Background technology
Blast furnace process energy consumption accounts for the 60% of steel and iron industry total energy consumption, is the energy consumption rich and influential family of steel and iron industry, its energy efficiency
Have a high potential.Smelting production of the blast furnace from the investment construction of early stage to the later stage, then repaiied into period, overhaul, blast furnace maintenance is thrown
Provide huge.Therefore the means such as usage factor, the strengthening smelting of each iron and steel enterprise all by improving blast furnace excavate blast furnace both at home and abroad
Potentiality so that the maximizing the benefits of blast furnace, but thus unavoidably increase the burden of blast furnace high thermal load regions, even
Can substantially reduce the service life of blast furnace, how to give full play to blast furnace production capacity and do not reduce blast furnace life-span be pendulum exist
A difficult problem in face of iron industry.For prolonging campaign, main restricted link in blast furnace high thermal load regions, wherein
Including bosh, furnace bosh and restoration of lower stack region.Original cast-iron cooling wall is extremely difficult to these above-mentioned efficient, long-lived targets.
Multiple type approval test shows：Using effect of the copper cooling wall on blast furnace is very good.Therefore, in restoration of lower stack furnace bosh and stove
Abdomen high thermal load regions modern blast furnace generally uses copper cooling wall cooling technology.Many blast furnaces have used copper in the world in the past 10 years
Cooling wall, it may be said that the life-span of cooling wall directly decides the service life of blast furnace.Require that its hot-face temperature is small according to copper material
In 230 DEG C, the hot face of copper cooling wall needs one layer of slag crust protective layer, and thickness of the slag crust is appropriate and to stablize, and it is cold can to reduce copper
But wall region heat loss and the holding reasonable operation type of furnace.Because Modern Large Blast Furnaces are using " high utilization factor, low coke ratio, big spray
Coal, the long-life " operates policy, and after injecting coal quantity is close to 180kg/t, bosh, furnace bosh, restoration of lower stack turn into extreme high heat load
Area, in cohesive zone formation range, washed away by high temperature and high speed Gas Flow, heat flow rate per unit area is big, and temperature change is big, copper cooling wall
Hot face slag crust easily comes off, and the hot face of blast furnace copper cooling stave is nearby the evil that high temperature, high pressure, highly corrosive, a high fever are shaken
Bad region, if protected without good slag crust, the service life of copper cooling wall will have a greatly reduced quality, and then can not meet the modern times
The requirement that big blast furnace is continuously kept the safety in production.
Patent《Intelligent monitoring method for cooling wall of blast furnace》(publication number CN 101319256A, publication date December 10 in 2008
Day) in text, application is blast-furnace cast iron cooling wall, and heat transfer kernel model is extracted using nonlinear regression, with reference to
Kernel model draws the detection model of the hot face maximum temperature value of cooling wall and forms monitoring of software with artificial neural network, main to solve
Certainly the problem of is the working condition for monitoring cast-iron cooling wall, ensures the security of cast-iron cooling wall, it is cold not relate to blast furnace copper
But the monitoring of wall and blast furnace profile.
Patent《A kind of method for measuring blast furnace lining》(publication number CN 101275829A, publication date on October 1st, 2008)
In text, the data method of extrapolating blast furnace crucible corrosion thickness that is detected with thermocouple, implementation region is bottom house cupola well
Region, it is not directed to the monitoring to thickness of the slag crust and blast furnace profile in the stove of blast furnace high heat load area.
The content of the invention
The present invention considers blast furnace copper cooling stave feature and blast furnace precisely in order to the deficiency mentioned in solution background technology
The reality of operation, a kind of method for extending blast furnace copper cooling stave service life is designed, alleviates conventional blast furnace copper cooling stave
Damaged very fast and not easily changeable contradiction.Containment vessel quickly can be established in basque weakened region using this method, so as to
Play a part of slowing down blast-furnace shaft erosion and improve the life of the blast furnace.
A kind of method for extending blast furnace copper cooling stave service life of present invention design, is comprised the steps of：
1st, blast furnace copper cooling stave hot-face temperature computing system, according to blast furnace copper cooling stave structure type, the installation of TC position
Put with quantity, blast furnace copper cooling stave methods for cooling, calculate blast furnace copper cooling stave using blast furnace copper cooling stave Calculation of Heat Transfer model
Hot-face temperature；
2nd, the hot face thickness of the slag crust of blast furnace copper cooling stave judges system, is calculated according to blast furnace copper cooling stave Calculation of Heat Transfer model
Blast furnace hot-face temperature and the hot face of COMPREHENSIVE CALCULATING blast furnace copper cooling stave such as slag crust thermal conductivity factor slag crust residual thickness, then by height
Furnace volume and the rational slag crust of structure choice allow most minimal thickness, determine whether the hot face thickness of the slag crust of blast furnace copper cooling stave is thin
To the most minimal thickness less than permission or complete to come off, to decide whether to establish certain thickness slag crust rapidly to protect
Protect copper cooling wall；
3rd, blast furnace copper cooling stave refrigeration system, when the thickness of the slag crust in the hot face of copper cooling wall is rapid less than the most minimal thickness allowed
Cooling medium is switched to quickly cooling medium including liquid freon by demineralized water or soft water, with liquid freon etc.
The Quick-gasifying of refrigerant, the blast furnace copper cooling stave of cooling required protection is forced, the hot face of blast furnace copper cooling stave is set up rapidly
Effective slag crust protection；
4th, ventilation and purifier and control system, it is responsible for completing the ventilation and heat of whole system and the liquid of cooling medium
Change cyclic process, the refrigerant that can make to gasify in copper cooling wall cooling line liquefies rapidly.Compressor is by copper cooling wall
Gaseous refrigerant boil down to HTHP gaseous refrigerant, be then delivered to condenser radiating after turn into normal temperature high voltage liquid
Refrigerant is re-circulated in copper cooling wall uses after filtering；
5th, repeat step 1, step 2, if the hot face thickness of the slag crust of copper cooling wall meets the minimum requirements of protection copper cooling wall,
Stop performing step 3, step 4 simultaneously, with cooling medium is switched back into original cooling agent, blast furnace copper cooling stave recovers normal cold
But and run.
The present invention has following characteristics and beneficial effect：
1) the damaged very fast and not easily changeable contradiction of conventional blast furnace copper cooling stave is alleviated.Can quickly it be existed using this method
Basque weakened region establishes containment vessel, so as to play a part of slowing down blast-furnace shaft erosion and improve the life of the blast furnace.
2) exception for reducing blast furnace copper cooling stave slag crust comes off, and the blast furnace crucibe temperature fluctuation that slag crust come off is brought,
Blast furnace direct motion steady in a long-term is ensured.
Embodiment
Illustrate the present invention with reference to specific embodiment：
With certain 3200m of the country3Exemplified by blast furnace, blast furnace copper cooling stave is implemented to protect using this method, comprised the steps of：
1st, blast furnace copper cooling stave hot-face temperature computing system, according to blast furnace copper cooling stave structure type, the installation of TC position
Put with quantity, blast furnace copper cooling stave methods for cooling etc., cooled down using blast furnace copper cooling stave Calculation of Heat Transfer model to calculate blast furnace copper
Wall hot-face temperature.
Blast furnace copper cooling stave physical arrangement is as follows, 1800~3200mm of length, and thickness 125mm, hot face processes multiple dovetails
Groove, for stablizing carbon brick, dovetail separation 104mm, depth of dovetail 35mm, dovetail well width 50mm process dovetail groove, every piece
There are 4 passage Ф 50mm water service pipes, water flow velocity is stable to be examined online in 2.0m/s, cooling water inlet temperature, outlet temperature provided with galvanic couple
Survey.One piece of copper cooling wall has 2 galvanic couple detection temperature changes, and wall body detection galvanic couple gos deep into wall body half (x1=47.5mm).Muscle
Rib detection galvanic couple depth is relatively deep (x2=90.5).Obtaining, cooling water outlet and inlet temperature, test point electric thermo-couple temperature, copper are cold
But under the premise of wall physical arrangement parameter, it is possible to calculate copper cooling wall hot-face temperature according to 2 dimension heat transfer models.
Monoblock cooling wall can be conducted heat and be divided into two parts, a part is rib, it is believed that material is single；Another part is
Copper and refractory composition.The heat flow rate per unit area q of monoblock cooling wall can utilize cooling water parameter to calculate：
In formula：Q be monoblock cooling wall heat flow rate per unit area, kW/m2；C is cooling water specific heat capacity, kJ/ (kg DEG C)；M is single
Cooling water flow in the time of position, kg/s；toFor cooling water leaving water temperature, DEG C；tiFor cold in-water temperature, DEG C；F cools down for copper
Wall surface Ji , ㎡.
Rib heat flow rate per unit area q1Calculate such as:
In formula：q1For rib heat flow rate per unit area, kW/m2；λ is copper cooling wall thermal conductivity factor, W/ (m DEG C)；tx2Cooled down for copper
Wall hot-face temperature, DEG C；t2To insert the temperature value of rib thermocouple, DEG C；Δx2For hot face and the distance of thermocouple, m.
Copper and refractory composition part heat flow rate per unit area q2Calculate such as formula:
In formula：q2For copper and refractory composition part heat flow rate per unit area, kW/m2；tx1To inlay refractory material hot-face temperature,
℃；B is to inlay refractory thickness, m；λ1To inlay Refractory Thermal Conductivity, W/ (m DEG C)；A is that copper cooling wall wall body is thick
Spend half, m；l1For cooling wall inner conduit spacing, m；D is cooling water pipe diameter, m；α cooling water heat transfer coefficients, W/ (㎡ DEG C)；
It is considered that the heat flow rate per unit area of monoblock cooling wall is the average value of two part heat flow rate per unit areas in Practical Project, so
Monoblock copper cooling wall heat flow rate per unit area q can also be expressed as:
Due to tx1And tx2Reflection is 2 points very near of temperature value of fore-and-aft distance, and is in copper cooling wall simultaneously
Hot face, therefore, t is taken hereinx1=tx2, therefore it is more than simultaneous various, finally extrapolate tx1And tx2, such as following formula：
2nd, the hot face thickness of the slag crust of blast furnace copper cooling stave judges system, is calculated according to blast furnace copper cooling stave Calculation of Heat Transfer model
Blast furnace hot-face temperature and the hot face of COMPREHENSIVE CALCULATING blast furnace copper cooling stave such as slag crust thermal conductivity factor slag crust residual thickness, then by height
Furnace volume and the rational slag crust of structure choice allow most minimal thickness, determine whether the hot face thickness of the slag crust of blast furnace copper cooling stave is thin
To the most minimal thickness less than permission or complete to come off, if need to establish certain thickness slag crust rapidly to protect copper cold
But wall；It is that slag crust solidifies boundary temperature condition with 1150 DEG C in the case where trying to achieve copper cooling wall hot-face temperature and heat flow rate per unit area,
Slag crust residual thickness Δ x is released according to heat transfer model is counter according to the physics value can including materials such as copper, slag crusts1：
In formula, λ2For slag crust thermal conductivity factor, W/ (m DEG C)；△ t are slag crust cold and hot surface temperature difference, DEG C；T solidifies for slag crust
Boundary temperature, DEG C；txIt is slag crust coldface temperature for copper cooling wall hot-face temperature, DEG C；Δx1The hot face slag crust remaining wall of copper cooling wall
Degree, m.
It is assumed that rational slag crust allows most minimal thickness to be e, if Δ x1<E, then need to establish certain thickness slag crust rapidly
To protect copper cooling wall；In this example, e 20mm.
3rd, blast furnace copper cooling stave refrigeration system, cooling is situated between rapidly according to the thickness of the slag crust estimate of situation in the hot face of copper cooling wall
Matter is switched to the quickly cooling medium including liquid freon by demineralized water or soft water, with refrigerants such as liquid freons
Quick-gasifying, the blast furnace copper cooling stave of cooling required protection is forced, the hot face of blast furnace copper cooling stave is set up effective slag rapidly
Skin is protected；
4th, ventilation and purifier and control system are responsible for completing the ventilation and heat of whole system and the liquid of cooling medium
Change cyclic process, the refrigerant that can make to gasify in copper cooling wall cooling line liquefies rapidly.Compressor is by copper cooling wall
Gaseous refrigerant boil down to HTHP gaseous refrigerant, be then delivered to condenser radiating after turn into normal temperature high voltage liquid
Refrigerant is re-circulated in copper cooling wall uses after filtering.
5th, repeat step 1, step 2, if the hot face thickness of the slag crust of copper cooling wall meets the minimum requirements of protection copper cooling wall,
Stop performing step 3, step 4 simultaneously, with cooling medium is switched back into original cooling agent, blast furnace copper cooling stave recovers normal cold
But and run.
Claims (2)
- A kind of 1. method for extending blast furnace copper cooling stave service life, it is characterised in that comprise the steps of：1) blast furnace copper cooling stave hot-face temperature computing system, according to blast furnace copper cooling stave structure type, position of thermocouple and Quantity, blast furnace copper cooling stave methods for cooling, the hot face of blast furnace copper cooling stave is calculated using blast furnace copper cooling stave Calculation of Heat Transfer model Temperature；2) the hot face thickness of the slag crust of blast furnace copper cooling stave judges system, the height calculated according to blast furnace copper cooling stave Calculation of Heat Transfer model Stove hot-face temperature and the slag crust residual thickness in the hot face of slag crust thermal conductivity factor COMPREHENSIVE CALCULATING blast furnace copper cooling stave, are then allowed by slag crust Most minimal thickness determines whether the hot face thickness of the slag crust of blast furnace copper cooling stave is thin and arrived less than the most minimal thickness or complete allowed Into coming off, to decide whether to establish certain thickness slag crust rapidly to protect copper cooling wall；3) blast furnace copper cooling stave refrigeration system, when the thickness of the slag crust in the hot face of copper cooling wall rapidly will be cold less than the most minimal thickness allowed But medium is switched to quickly cooling medium including liquid freon by demineralized water or soft water, with liquid freon refrigerant Quick-gasifying, force cooling required protection blast furnace copper cooling stave, the hot face of blast furnace copper cooling stave is set up rapidly effectively Slag crust is protected；4) ventilation and purifier and control system, it is responsible for completing the ventilation and heat of whole system and the liquefaction of cooling medium follows Ring process, the refrigerant that can make to gasify in copper cooling wall cooling line liquefy rapidly；Compressor is by the gas in copper cooling wall State refrigerant compression is the gaseous refrigerant of HTHP, is then delivered to after condenser radiating as the liquid refrigeration of normal temperature high voltage Agent is re-circulated in copper cooling wall uses after filtering；5) repeat step 1, step 2, if the hot face thickness of the slag crust of copper cooling wall meets the minimum requirements of protection copper cooling wall, simultaneously Stop performing step 3, step 4, with cooling medium switched back into original cooling agent, blast furnace copper cooling stave recover normal cooling and Operation.
- 2. a kind of method for extending blast furnace copper cooling stave service life according to claim 1, it is characterised in that slag crust is permitted Perhaps most minimal thickness 10-50mm.
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| CN107385131A (en) * | 2017-09-01 | 2017-11-24 | 武汉钢铁有限公司 | It is a kind of to tackle the bosh furnace bosh restoration of lower stack blast-furnace soft water cooling means that instantaneously big heat impacts |
| CN111500808B (en) * | 2020-03-18 | 2021-10-12 | 唐山钢铁集团有限责任公司 | Method for judging comprehensive heat-conducting performance of cooling wall |
| CN112575134B (en) * | 2020-12-04 | 2022-05-03 | 攀钢集团研究院有限公司 | Blast furnace slag skin thickness calculation method and blast furnace high-temperature area operation furnace type online calculation system |
| CN112668148B (en) * | 2020-12-04 | 2022-07-29 | 攀钢集团研究院有限公司 | Method for judging upper airflow distribution condition and furnace condition of high-titanium blast furnace |
| CN116663277B (en) * | 2023-05-22 | 2023-12-26 | 广州吉谷电器有限公司 | Method and device for prolonging service cycle based on water boiling kettle |
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| CN103439999A (en) * | 2013-08-23 | 2013-12-11 | 武汉钢铁(集团)公司 | Method for controlling abnormal furnace temperature of blast furnace according to temperature changes of cooling wall |
| CN104404187A (en) * | 2014-11-24 | 2015-03-11 | 中冶赛迪工程技术股份有限公司 | Blast furnace brickwork slag shell thickness monitoring system and method |
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| CN103439999A (en) * | 2013-08-23 | 2013-12-11 | 武汉钢铁(集团)公司 | Method for controlling abnormal furnace temperature of blast furnace according to temperature changes of cooling wall |
| CN104404187A (en) * | 2014-11-24 | 2015-03-11 | 中冶赛迪工程技术股份有限公司 | Blast furnace brickwork slag shell thickness monitoring system and method |
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