CN1888081B - Liquid blast furnace slag pelletizing method and apparatus for heat recovering process - Google Patents
Liquid blast furnace slag pelletizing method and apparatus for heat recovering process Download PDFInfo
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- CN1888081B CN1888081B CN2006100544665A CN200610054466A CN1888081B CN 1888081 B CN1888081 B CN 1888081B CN 2006100544665 A CN2006100544665 A CN 2006100544665A CN 200610054466 A CN200610054466 A CN 200610054466A CN 1888081 B CN1888081 B CN 1888081B
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The present invention is liquid blast furnace slag pelletizing method and apparatus for heat recovering process, and features that the liquid slag blast furnace discharges in downward flow is crushed into grains with the pelletizing apparatus in high speed rotation to produce centrifugal force of throwing the liquid slag. Crushing the liquid slag into relatively homogeneous fine grains can ensure the effective heat exchange between slag and gas. The pelletizing apparatus is one wheel spoke type disc or cup structure capable of ensure the effective recovering of heat from the liquid blast furnace slag.
Description
Technical field
The present invention relates to the recovery and utilization technology of energy-conservation, the secondhand energy of ferrous metallurgy process; Especially being applied to the sub product that the blast furnace ironmaking process is produced--the heat recuperation of high-temperature liquid state blast furnace slag is technological, is specifically related to the granulating method and the device thereof of slag in a kind of liquid blast furnace heat recovering process.
Background technology
Iron And Steel Industry is an energy and the huge industry of resource consumption.In iron manufacturing process, in entering molten iron such as the heat of a large amount of coke of consumption etc. and molten steel, coal gas or flue gas, the liquid blast furnace.The large percentage that the physics heat that wherein liquid slag contained is occupied.To the high-temperature liquid state blast furnace slag, because temperature is high, the heat that accumulates is big, and the utilization of its physics heat is one of most important energy saving direction of present iron and steel enterprise.The metallurgical secondary resource and the energy are carried out fully and the utilization of high added value, are one of keys of metallurgical industry Sustainable development, also are the effective measure that reduce environmental pollution
[1]
The Jinan Iron And Steel Company that produced 4000000 tons of steel with 2002 per year is an example, 720,000 tons of the blast furnace slags of its discharging, and the temperature of liquid blast furnace is about 1450 ℃ when slagging tap, its callable waste heat reaches 4.28 ten thousand tons of standard coal equivalents every year.Thus it is clear that, contain lot of energy in the high-temperature liquid state blast furnace slag.But because the quantity of blast furnace slag is maximum, the time of slagging tap is short, the speed of slagging tap is big, and the difficulty of heat recuperation is bigger.
At present, the research of high temperature sludge Btu utilization is mainly concentrated on the aspects such as high-temperature ash of coal firing boiler both at home and abroad, almost do not have the high-temperature liquid state blast furnace slag heat to utilize the document of aspect to deliver
[2]Coal-burning power plant etc. is made the high-temperature ash that boiler combustion process discharged of fuel with coal, domesticly just begun to carry out cooling and heat recuperation Study on Technology such as wind (air).Domestic and international research mainly concentrates on the aspects such as thermo-efficiency that cindery air-cooled, wind or cigarette G&W are united design and experimental study, the numerical simulation of cooling, slag cooler and how to be improved boiler
[3-8]Also can take away the heat of slag with the water coolant in spiral rachis that pushes ahead and the housing chuck, and the heat that the recovery water coolant is taken away is accomplished the recovery to heat in the slag
[9]
Aspect the utilizing of the metallurgical slag heat that produces in the iron-making and steel-making process, research shows that the blast furnace slag of high-temperature liquid state can be used as thermal source, can be used for coal gasification
[10]But Study on Three Dimensional Numerical Simulation is carried out in the mobile and heat transfer of liquid towards slag in electric furnace, to inquire into the thermo-efficiency and the Btu utilization of electrosmelting
[11]Because the liquid steel scum contains a large amount of energy, available fused-salt medium reclaims its heat
[12]
At present, in smelter, reclaiming the unique successful example of heat is dry quenching(of coke).What this method generally adopted is with rare gas element (CO
2, N
2) as the medium that absorbs red-hot coke.Promptly in a closed unit, approximately pass through the cooling of 2.5h, N
2About 1000 ℃ high temperature cokes are cooled to about 250 ℃, reclaim the heat of the rare gas element that has improved temperature again by waste heat boiler.Gas after cooling and dedusting continues circulation and is used for dry quenching(of coke).
And China's blast furnace slag all adopts shrend, does not also adopt the enterprise of air cooling (or rare gas element cooling); There have 2-3 producer to carry out gas to bessemer furnace slag to be broken, but do not have a large amount of heats of liquid towards slag to recycle.And slag adopts shrend, and with the water yield of labor, its grain slag compares at 8-15: about 1.Abroad (mainly being Japan) has the research of wind cooling method aspect bessemer furnace slag, and can carry out the recovery (the refrigerative main purpose is the granulation of slag) of heat simultaneously, but its technology is not open; Blast furnace slag is not also carried out relevant research work.
Owing to the utilization of liquid blast furnace energy exists the suitable difficulty and the reason of others; See from document of having delivered both at home and abroad and the patent of having declared; To the utilization of high temperature furnace slag sensible heat, the domestic research work of also not carrying out does not in this respect have sophisticated and technology that provide a reference; Relevant report is not seen in research in this respect yet abroad.Promptly worldwide, physics heat that the high-temperature liquid state blast furnace slag that blast furnace ironmaking is produced contains and heat of phase transformation etc. all do not have effective industriallization recovery method.There are two key issues in the heat recuperation of liquid towards blast furnace slag: the one, and the granulation of melt cinder; The 2nd, how to carry out the heat exchange of high temperature furnace slag and cooling gas most effectively, make the thermo-efficiency of recovery the highest.
Summary of the invention
To the above-mentioned deficiency that prior art exists, the purpose of this invention is to provide the granulating method of slag in a kind of liquid blast furnace heat recovering process, to reach efficient recovery, to utilize the purpose of the physics heat of high-temperature liquid state blast furnace slag.
Another object of the present invention is for realizing that aforesaid method provides a kind of device of liquid towards blast furnace slag granulation.
The objective of the invention is to realize like this: the granulating method of slag in the liquid blast furnace heat recovering process; The melt cinder that it is characterized in that the blast furnace discharge is in dirty process; Centrifugal action through the granulating device high speed rotating; Liquid blast furnace moved along the rotator top of granulating device to be thrown away, motion throw away and collision process in be broken into granular; Specifically comprising the steps: 1) the high-temperature liquid state blast furnace slag flows out from the bottom house cinder notch, gets into the cast gate on the heat recuperation closed unit; 2) in cast gate, flow on the granulating device of rotation, high speed rotating and centrifugal action through granulating device are broken into melt cinder gas granular.
A kind of liquid blast furnace slag granulation device is characterized in that main body is the radial disc structure, and the centre is solid disk; The water chestnut bar is set around the disk radially outward; Leave the slit that slag particle passes through between the adjacent two water chestnut bars, disk is at whole spoke water chestnut bar central dip; The bottom of disk is connected with motor through transmission shaft; The outer of disk is provided with baffle plate.
The another kind of form of liquid blast furnace slag granulation device is that main body is a cup formula structure, and the centre is a up big and down small round table-like cup, and bottom and sidewall are in obtuse angle; Evenly be provided with discharge hole on the sidewall of cup; The cup outer shroud is provided with the water chestnut bar radially outward; Leave the slit that slag particle passes through between the adjacent two water chestnut bars, cup is at whole spoke water chestnut bar central dip; The bottom of cup is connected with motor through transmission shaft.
Further invention is that the section of said spoke water chestnut bar is a trilateral, laterally and upwards arranges 5-7 thorn on the water chestnut bar at interval.The melt cinder granulating device is through the speed of motor and its rotation of transmission system control.
Adopt the inventive method, have following advantage:
1, in short time range, making liquid slag grain change into smaller particles, is to guarantee one of key that reclaims melt cinder heat effect.Adopt the inventive method can in short time range, obtain more even, tiny particle slag.Particle is thin more, and it is just short more that slag and gas carry out the time of net heat exchange, and the inner heat of particle slag carries out heat exchange with regard to spreading out of the particulate surface more easily with gas.Particle is tiny more, and particle is just fast more by the speed of chilling, and the quality of particle slag (comprises indexs such as intensity, activity.Intensity is high more; The surface energy that the grain slag stores is big more, and activity is good more) just good more.
2, the present invention adopts air cooling technology cooling liquid blast furnace, and the high-temperature gas after heat exchange generates electricity, is used for hotblast stove etc. as waste heat boiler, and gas circulates after replenishing the new gas of a part blast furnace slag is cooled off.
3, the present invention can reclaim a large amount of energy, and the cooling with liquid blast furnace etc. simultaneously changes air cooling into by water-cooled, significantly saves cooling water inflow, can practice thrift great amount of water resources; Can eliminate the secondary pollution of water coolant, guarantee that the physico-chemical property of cooling back slag is similar or better with the slag of shrend, and each smelter is applicable at home.
4, realize two kinds of granulating devices of the inventive method, simple in structure, reasonable in design, all can guarantee that the online blast furnace slag of liquid towards effectively carries out granulation, thereby the heat that guarantees the liquid towards blast furnace slag reclaims effectively.
Description of drawings
Fig. 1 is the structural representation of granulating device of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the structural representation of another embodiment of granulating device of the present invention;
Fig. 4 is the vertical view of Fig. 3;
Fig. 5 is the photo of liquid blast furnace slag granulation experimentation.
Embodiment
Discover that the recovery of liquid blast furnace heat has the problem of two keys to need to solve: the one, the granulation problem of melt cinder, the 2nd, how the heat of slag exchanges most effectively and gives cooling gas after the granulation.The present invention solves preceding problem.
The granulating method of slag in the liquid blast furnace heat recovering process of the present invention, concrete steps are following:
1) the high-temperature liquid state blast furnace slag flows out from the bottom house cinder notch; 2) flow to the blast furnace platform edges through the stokehold slag runner; 3) cast gate on the entering heat recuperation closed unit; 4) in cast gate, flow on the granulating device of rotation; 5) through the high speed rotating and the centrifugal action of granulating device, be broken into melt cinder gas granular.
The granulating photo that Fig. 5 has provided cup formula granulating device (in order to take a picture and to watch conveniently, carries out outside encloses container during granulation.Certainly the melt cinder among the figure is not carried out heat recuperation).Experiment and photo thereof show: the granulation effect of high-temperature liquid state blast furnace slag is fine.The melt cinder granulating device is through the speed of motor and its rotation of transmission system control, and the speed of rotation is adjustable.To the geartransmission of transmission adopted motor drives, transmission system is positioned at the inside or the outside of closed unit, and as sealing thermal insulation protection to transmission system in inside, its detailed content is seen " heat reclaim unit and method " part of application simultaneously.
Melt cinder granulation principle of the present invention: be exactly melt cinder in dirty process, the centrifugal action of the high speed rotating through granulating device, liquid blast furnace moved along the rotator top of granulating device to be thrown away, motion throw away and collision process in be broken into granular.The factor that influences grain graininess has: the speed of rotation of granulating device, the viscosity of melt cinder are (promptly mobile.Relevant with the temperature and the chemical constitution of melt cinder), the structure (kind that comprises two kinds of granulating devices of the water chestnut bar of shape, structure and setting, the thorn on the water chestnut bar etc., optimization design of the present invention of granulating device.
Embodiment 1: like Fig. 1, shown in Figure 2, the centre of its spoke of radial granulating device is solid disk 1, and water chestnut bar 2 is set around the disk 1 radially outward; Leave the slit that slag particle passes through between the adjacent two water chestnut bars 2, disk 1 is at whole spoke water chestnut bar 2 central dips; The bottom of disk 1 is connected with motor through transmission shaft 3; The outer of disk is provided with baffle plate 4, and its main purpose is to prevent that the high temperature sludge after the granulation from beating the inwall to container, and with the wall adhesion.Solid disk 1 is to the spoke part smooth transition.The purpose of design has two like this: the one, the bottom rotating shaft is protected, and avoid the damage of melt cinder or high temperature grain slag countershaft; The 2nd, through rotation, with solid disk and spoke at the texture ratio of same level attitude, can broken better melt cinder.
Spoke part is provided with tens of of water chestnut bars, and the cross dimensions of water chestnut bar is leg-of-mutton, and the water chestnut bar is arranged radially outward, laterally and upwards arranges 5-7 thorn 7 on the water chestnut bar at interval, to strengthen crushing effect.The length of thorn is to be advisable about 5mm.
The characteristics of spoke scheme are: the processing power of liquid towards blast furnace slag is big, and efficient is higher; But granularity is also corresponding bigger.Be suitable for being used in the bigger blast furnace of flow (unit time in go out the quantity of slag) of slagging tap.
Embodiment 2: like Fig. 3, shown in Figure 4, cup formula granulating device main body is a cup formula structure, and the centre is a up big and down small round table-like cup 5, and cup 5 bottoms and sidewall are in obtuse angle; Evenly be provided with discharge hole 6 on the sidewall of cup 5; Cup 5 outer shrouds are provided with water chestnut bar 2 radially outward, leave the slit that slag particle passes through between the adjacent two water chestnut bars 2; The section of water chestnut bar 2 is triangular in shape, laterally and upwards arranges 2-3 thorn 7 on the water chestnut bar 2 at interval, to strengthen crushing effect.The length of thorn is about 5mm.
The height of cup: the too high heavy-gravity slag of bulk or the solid-state slag crust of possibly making is not easy to be thrown out by the top from cup, and it is little to cross the reduction process ability, specifically designs according to the needs of treatment capacity.
The height of cup and diameter all have very big influence to productivity.Height and diameter are big more, and the turnout in the unit time is just big more.To the blast furnace of different sizes, parameters such as reply height and diameter are optimized.
Planar section is extended on the top of cup has certain length, and this plane is provided with the water chestnut bar, and it is broken with solid slag to be convenient to the higher melt cinder of part viscosity.The material of cup adopts high quality high temperature steel.For the heat recuperation rate that improves gas with do not influence rotation, cup should not be used water cooling.
This apparatus features is: the A. cup is bigger to melt cinder granulation ability of processing, and production efficiency is higher.B. to the melt cinder slag crust of small amount of solid state, can pass through action of centrifugal force, throw away along cup top, and broken through collision.
Innovation of the present invention is: the granulating device of two kinds of liquid high temperature blast furnace slags of A. all can be realized the melt cinder granulation preferably.B. two kinds of granulating devices can be according to the difference of melt cinder flow (different high furnace capacitys and the mode of slagging tap different; The flow of melt cinder is different), the grain slag can effectively carry out heat exchange and the utilization of the grain slag difference to the requirement of its granularity, and select and adjust suitable structural parameter and processing parameter and reach requirement.C. for reclaiming heat,, associated documents and patent were not arranged also in the past to the mechanical granulation device of high-temperature liquid state blast furnace slag.
Device and correlation technique thereof by the inventive method design; Build relative unit near the trough of the blast furnace of the relevant enterprise outlet at home and abroad; And the heat reclaim unit and the technology of combination slag; The heat of phase transformation and physics heat that realize reclaiming liquid blast furnace effectively and contained, the quality of the grain slag after the heat recuperation and the quality of the preceding flush slag of existing State of Blast Furnace are quite or better.The present invention is through having carried out relevant experimental study in the laboratory, the granulation in the experiment is respond well.
Claims (3)
1. a liquid blast furnace slag granulation device is characterized in that, main body is the radial disc structure, and the centre is solid disk (1); Disk (1) is provided with water chestnut bar (2) all around radially outward, leaves the slit that slag particle passes through between the adjacent two water chestnut bars (2), and disk (1) is at whole spoke water chestnut bar (2) central dip; The bottom of disk (1) is connected with motor through transmission shaft (3), and driven by motor disk high speed rotating, the melt cinder in the dirty process throw away along disk (1) top under centrifugal action, motion throw away and collision process in be broken into granular; The outer of disk (1) is provided with baffle plate (4).
2. a liquid blast furnace slag granulation device is characterized in that, main body is the radial cup structure, and the centre is a up big and down small round table-like cup (5), and bottom and sidewall are in obtuse angle; Evenly be provided with discharge hole (6) on the sidewall of cup (5); Cup (5) outer shroud is provided with water chestnut bar (2) radially outward; Cup (5) is at whole spoke water chestnut bar (2) central dip; The bottom of cup (5) is connected with motor through transmission shaft (3), and driven by motor cup (5) high speed rotating, the melt cinder in the dirty process throw away along cup (5) top under centrifugal action, motion throw away and collision process in be broken into granular.
3. liquid blast furnace slag granulation device according to claim 1 and 2 is characterized in that, the section of said spoke water chestnut bar (2) is a trilateral, laterally and upwards arranges 5-7 thorn (7) on the water chestnut bar at interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100544665A CN1888081B (en) | 2006-07-20 | 2006-07-20 | Liquid blast furnace slag pelletizing method and apparatus for heat recovering process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100544665A CN1888081B (en) | 2006-07-20 | 2006-07-20 | Liquid blast furnace slag pelletizing method and apparatus for heat recovering process |
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| Publication Number | Publication Date |
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| CN1888081A CN1888081A (en) | 2007-01-03 |
| CN1888081B true CN1888081B (en) | 2012-07-04 |
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Families Citing this family (10)
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| CN101824499B (en) * | 2010-03-19 | 2011-11-30 | 昆明阳光基业股份有限公司 | Liquid blast furnace slag granulation device and granulation method thereof |
| GB2493969B (en) * | 2011-08-26 | 2013-08-07 | Siemens Plc | Slag dispersal device and method |
| CN103924012B (en) * | 2014-05-05 | 2015-12-02 | 重庆大学 | A kind of metallurgical cinder dry granulation waste-heat recovery device and method |
| CN104087690A (en) * | 2014-06-10 | 2014-10-08 | 曾志勇 | Thermal energy recovery device and thermal energy recovery method of high-temperature slag |
| CN105905939B (en) * | 2016-04-21 | 2017-07-28 | 重庆大学 | The apparatus and method of chlorination are directly granulated after a kind of titanium-containing blast furnace slag carbonization |
| CN108588311B (en) * | 2018-03-27 | 2020-07-03 | 辽宁科技大学 | Device and method for focusing and tracking single slag liquid filament to be broken into drops |
| CN110125426A (en) * | 2019-05-09 | 2019-08-16 | 辽宁科技大学 | A kind of ferroalloy granulating device and method |
| CN110016529B (en) * | 2019-05-31 | 2020-01-17 | 安徽中巨机电设备有限公司 | Slag pot on-line cleaning device |
| CN113618074B (en) * | 2021-08-16 | 2023-04-18 | 辽宁科技大学 | Device and method for preparing iron alloy particles |
| CN115198041B (en) * | 2022-07-08 | 2023-10-17 | 中国科学院力学研究所 | Particle size control system, method and application for centrifugal granulation and pulverization of turntable |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2148330A (en) * | 1983-10-24 | 1985-05-30 | British Steel Corp | Improvements in or relating to the granulation of slag |
| CN2388210Y (en) * | 1999-08-25 | 2000-07-19 | 中国冶金建设集团包头钢铁设计研究总院 | Disk dewatering blast furnace slag granulating device |
| JP2005082454A (en) * | 2003-09-09 | 2005-03-31 | Central Res Inst Of Electric Power Ind | Granulating method of molten slag and granulating device of molten slag |
| CN2795216Y (en) * | 2005-06-17 | 2006-07-12 | 李志成 | Lifting and dewatering device for blast furnace slag granulation device |
-
2006
- 2006-07-20 CN CN2006100544665A patent/CN1888081B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2148330A (en) * | 1983-10-24 | 1985-05-30 | British Steel Corp | Improvements in or relating to the granulation of slag |
| CN2388210Y (en) * | 1999-08-25 | 2000-07-19 | 中国冶金建设集团包头钢铁设计研究总院 | Disk dewatering blast furnace slag granulating device |
| JP2005082454A (en) * | 2003-09-09 | 2005-03-31 | Central Res Inst Of Electric Power Ind | Granulating method of molten slag and granulating device of molten slag |
| CN2795216Y (en) * | 2005-06-17 | 2006-07-12 | 李志成 | Lifting and dewatering device for blast furnace slag granulation device |
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