CN101921884A - Blast furnace slag dry-type sensible heat recovery system and production process - Google Patents
Blast furnace slag dry-type sensible heat recovery system and production process Download PDFInfo
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- CN101921884A CN101921884A CN2009100864050A CN200910086405A CN101921884A CN 101921884 A CN101921884 A CN 101921884A CN 2009100864050 A CN2009100864050 A CN 2009100864050A CN 200910086405 A CN200910086405 A CN 200910086405A CN 101921884 A CN101921884 A CN 101921884A
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The invention provides a blast furnace slag dry-type sensible heat recovery system and a production process. The production process comprises a slag tundish heat preservation process, a spray gun slag spraying process, a slag multiple jet flow granulation heat exchange process, an impact grinder grinding process and a double-cooling fluidized bed heat recovery process. After being subjected to nitrogen blowing saturated treatment in the tundish, the blast furnace slag is sprayed out by a high-speed air flow spray gun, high-speed air flow slag grains impact one another to be granulized in a jet flow mill, forced heat exchanged is performed, the slag grains move downward and are rebounded and crushed by a flat plate impact grinder, and the crushed slag grains are subjected to heat exchange and cooling; and a double-cooling fluidized bed is used for recovery the heat of the slag grains for a second time, and the heat recovered at the first time and the heat recovered at the second time are converted into heat energy or electric energy by a heat exchanger. When the system and production process of the invention are used, the heat recovery rate of the blast furnace slag reaches more than 80 percent; the finished slag yield is more than 90 percent; the granularity is less than 5 millimeters; the system does not use cooling water in a whole process; and the dry-type treatment saves a large amount of water.
Description
Technical field:
The invention belongs to waste heat complementary energy recovery technology field, particularly a kind of blast furnace slag dry-type sensible heat recovery system and production technique.
Background technology:
The blast furnace slag sensible heat is the higher-grade residual heat resources, has very high recovery value.Present most of iron and steel enterprise adopts water quenching technology to handle blast furnace slag, and the slag sensible heat does not obtain reclaiming substantially.Along with increasingly sharpening and the energy lasting in short supply of international competition, steel industry is faced with the multinomial environmentally friendly problem of maintaining the strategy of sustainable development.Wherein, efficient higher-grade ground recovery blast furnace slag sensible heat has become the technical barrier of demanding urgently breaking through.
U.S. Pat 5255900 has been reported and has been used for the pelletizer that melting slag waste heat reclaims and the relevant design method of fluidized-bed.The temperature of slag particle can be controlled by the adjusting of air circulation in the fluidized-bed, is generally 500～800 ℃.The heat recuperation rate of this device is about 64%, but the available energy utilization ratio is on the low side.
The patent 200510047090.0 of Anshan iron and steel plant group application discloses a kind of blast-furnace cement sensible heat recovery system and production technique, it is made up of just cold-breaking unit, gas-slag heat exchange unit, waste heat boiler, slag notch at blast furnace is provided with just cold-breaking unit, this unit adopts dual mode, a kind ofly is made up of slag divider, disintegrating slag gear, cooling spray pipe and skimming plate; Another kind of mode is direct jet tube, is made up of slag trough, slag divider, cooling spray pipe and skimming plate.Be cooled to 1200 ℃ at zero pour below-1300 ℃ at this unit slag, be broken into the slag particle of diameter less than 100mm, just cold-breaking unit back is the reforwarding conveying device in succession, connect gas-slag heat exchange unit then, this unit can adopt two kinds of different modes, a kind of employing be chain grate machine, another kind of mode is the slag ladle structure.Air is heated to 700 ℃-800 ℃ in this unit, and slag is cooled to below 150 ℃, and the air after the heating is transported to waste heat boiler, and the water in the boiler heating tube absorbs the heat of gas, and generation pressure is 0.3-0.4MPa, and temperature is 260-350 ℃ a steam.The present invention has realized the efficient recovery of liquid blast furnace sensible heat, and the complex energy rate of recovery reaches more than 70%, reduces energy consumption in steel production, reduces the consumption of slag cooling water, and the environmental pollution that brings thus.Yet because this technology is simple and easy relatively, the slag grinding particle size is thicker, and the finished product cinder grade that makes is relatively poor, is difficult to realize higher value application.Simultaneously thicker slag particle and the heat exchange contact area between air are little, are unfavorable for the exchange of heat, and heat exchange efficiency is low.
Develop wind crush method blast furnace slag sensible heat recovery technology in Japan the eighties in 20th century.The molten slag of temperature more than 1400 ℃ that blast furnace is discharged imports wind-tunnel granulation portion; adopt 3 to divide equally slag stream for slag; slag blows radionization by the high-velocity jets of coming out in the nozzle, and nozzle place air velocity is adjustable, and tunnel size is long 25m, wide 7m, high 13m (processing power is 100t/h).Be provided with breaker plate in the wind-tunnel slag particle striking plate about 1050 ℃ is fallen, the air cooling that is blown into by the wind-tunnel bottom in the dropping process, slag particle is discharged wind-tunnel about about 800 ℃.The warm sludge grain of discharging is stored in the warm sludge grain warehouse behind weigh bridge, vibratory screening apparatus (removing big footpath particle), is cooled to discharge about 150 ℃ by the secondary fluidized bed exchanger again, and the quality that obtains the finished product slag guarantees by the speed of cooling in the wind-tunnel.The evenly heat rate of recovery that reaches in the test is 48%, and wind-tunnel outlet wind-warm syndrome reaches 500 ℃, and particle diameter partly accounts for more than 95% less than 5mm in the finished product slag, and the whole vitrifying rate of slag particle is greater than 95%, and comminuted good, quality and Water Quenching Slag are suitable.The broken technology of slag wind of Japan's exploitation, so far still can be referred to as the obtained overachievement of wind crush method, the scale operation test-results that the processing power of its slag reaches 100t/h shows that heat recovery efficiency and finished product slag quality can reach industrialization demands.But, because the restriction of factor such as device systems is huge, floor space is big, investment cost is high and the systematic procedure power loss is excessive had just stopped the progressive paces at that time.
According to the analysis to the prior art data, present most technologies all have problems such as heat exchange efficiency is low, finished product slag particle footpath grain is big, equipment is huge.The present invention has promptly proposed novel blast furnace slag cement sensible heat recovery system and production technique at the problem of these aspects.
Summary of the invention:
The present invention proposes a kind of blast furnace slag dry-type sensible heat recovery system and production technique, with the liquid blast furnace fragmentation, realize the gas-solid enhancement of heat transfer by high velocity air, displace the higher-grade warm air by impinging jet, realize that by waste heat boiler sensible heat reclaims, and obtains even fine finished product slag simultaneously.
Technical scheme of the present invention is as follows: adopt the slag Tundish Technology that blast furnace slag is focused on, guaranteed the continuity and the high efficiency of operating procedure; Utilize spray gun to control taking out of of slag and granulation, used gaseous media can adopt nitrogen more than needed or the air in the Steel Plant, the fragmentation of easier realization slag and granulation; Utilize jet mill to strengthen the broken of slag particle and cooling rapidly having special advantages aspect enhancement of heat transfer, the refinement slag particle; Employing plate impact mill further promotes the fragmentation and the heat exchange cooling of high temperature slag particle; Use two cold fluidized-beds that slag heat is carried out secondary recovery, improved whole heat recovery efficiency.
Implementing key of the present invention is: with suitable slag tolerance ratio and gas velocity slag also is cooled to below 950 ℃ in the indoor granulation of granulation rapidly, causes again the phenomenon of thickization will not adhering between the slag particle under this temperature; The granulation slag particle is being fractured into thinner particle (ductile rupture takes place blast furnace slag, and brittle rupture takes place when being lower than 1250 ℃) greater than 1250 ℃ the time under the effect of jet mill, and in the micronized while, accelerated the heat transfer rate of slag particle and gaseous media; At last, under the effect of impact grinding, slag particle is once more by refinement, further the enhanced heat exchange effect.In addition, the slag particle in the total system of the present invention all is in＜950 ℃ temperature condition, slag particle also can not take place and wall between adhesive attraction (this sticking temperature is 1050 ℃).Therefore, this programme really can obtain the dried slag goods (granularity is thinner, and the vitrifying degree is higher) of very high heat recovery efficiency (gas consumption reduces, and hot blast temperature improves) and high added value simultaneously.
In view of the characteristic of blast furnace slag, process system of the present invention comprises five critical processes: slag tundish heat preservation method, spray gun slag are taken technology, slag multiple jets granulation heat-exchanging process, impact grinding disintegrating process and two cold fluidized-bed heat recovering process out of.
The present invention carries slag tundish heat preservation method and has designed the saturated measure of slag nitrogen flushing, the mixing and the temperature uniform distribution of slag in the tundish have been promoted, guarantee that the slag temperature in the tundish remains on more than 1400 ℃, takes the influence of part solid clinker to whole process system out of to prevent slag premature coagulation and high outlet of still.
The present invention carries the spray gun slag and takes technology out of with the spray gun of circular or the flat single laval nozzle slag liquid level that submerges, and controls out the quantity of slag by the altitude mixture control of nozzle and outlet at bottom, passes to N in the spray gun
2Or the air supersonic jet, slag taken out of blow radionization simultaneously.
The present invention carry slag multiple jets pelletizing technology be in the extremely short time with the complete granulation of slag, and be cooled to rapidly below 950 ℃, granulation that obtains and heat exchange effect reach ten times even tens times of traditional method.
It is to pulverize the high temperature slag particle further refinement of district with granulation that the present invention carries the impact grinding disintegrating process, and to obtain the slag goods of high added value, the process of refinement is simultaneously further moved hot and cold but to slag particle.
It is that 400-600 ℃ the slag particle that comes out in the pulverizing district is carried out the secondary heat recuperation that the present invention carries two cold fluidized-bed heat recovering process, guarantees to obtain qualified slag goods, improves whole heat recovery efficiency simultaneously.
Production technique that the present invention carries possesses following characteristics:
(1) slag outlet is designed to shape in the Lavalle under the tundish: its advantage is that top, top rifle is when cinder notch is jetted, cinder notch becomes the shape extension, Lavalle of top rifle slag mouth, the high pressure draft surface is surrounded by slag, velocity contrast between slag stream and the air-flow constantly increases, thereby the powerful shearing force that produces makes slag stream become tiny drop.Because air-flow is to get over velocity of sound, makes in the process of slag stream acceleration at air-flow, and heat exchange takes place between the two hardly.Thereby cinder notch is reduced greatly by the adherent danger of slag condensation.
(2) jet mill: the granulation Heat Room inserts the high velocity air spray gun formation jet mill of each symmetrical annular radial arrangement more than three up and down; the drop that will greatly reduce from the speed of top is involved in the cycle yield zone; drip in the course of following the cycle air motion at slag; carry out heat exchange, arrive the jet mill center and grind when distinguishing then by further granulation.This circulating prolongs drop or slag particle at the indoor mean residence time of granulation, and further micronize then increases total heat interchanging area greatly, thus the enhanced heat exchange effect.
(3) impact grinding: in the granulation Heat Room completely solidified slag particle and center still have comparatively thick slag particle that liquid phase exists to quicken the two phase flow nozzle through high pressure to form high-speed jet and impact the strike plate that is located at the crushiing chamber bottom and form impact grinding with powerful kinetic energy by the outlet of granulation Heat Room; thereby slag particle is by miniaturization once more the time, again enhanced heat exchange effect.
These characteristics are that the broken air cooling method of any other wind is incomparable.Compare with the method that aforementioned Japan develops, device heat transfer efficiency height, the shearing of high velocity air drives, and the high strength turbulence of impingement region vibration infiltration, improves the heat transfer efficiency of gas and slag greatly; The Heat Room volume dwindles greatly, the space availability ratio height; The preliminary resource utilization of slag, the granularity of slag goods and quality will be thinner better; In addition, the cooling gas medium also can utilize the nitrogen more than needed of Steel Plant, uses the performance of rare gas element expection can raising final state slag particle.
Technology that the present invention carries will reach following effect:
The heat recovery efficiency of blast-furnace slag surpasses 80%, and hot air temperature can reach 700-800 ℃, can change into water vapor or electricity usage; Slag goods recovery rate＞90%, and granularity less than 5mm, vitrifying rate greater than 95%, can be made for cement clinker and high-valued; Whole process is not used water coolant, need not relevant therewith equipment and investment; The a large amount of waters of dry process saving, slag neutral and alkali composition do not cause water to pollute, and do not produce obnoxious flavour such as H2S to atmospheric pollution, avoid a large amount of energy consumptions of slag particle drying process.
Description of drawings:
The contrast accompanying drawing is further described this invention below:
Accompanying drawing 1 is blast furnace slag dry-type sensible heat recovery system figure
In the accompanying drawing: 1, slag tundish; 2, vent peg; 3, slag exit; 4, slag; 5, spray gun; 6, granulation Heat Room; 7, nozzle; 8, circulating line; 9, jet mill; 10, grind the district; 11, crushiing chamber; 12, pneumatic trap; 13, nozzle; 14, impact grinding; 15, strike plate; 16, cyclonic separator; 17, heat grain relief outlet; 18, two cold moving-beds (fluidized-bed); 19, admission piece; 20, circulating line; 21, porous awl; 22, exhaust nozzle; 23, circulating line; 24, porous plate; 25, slag sand outlet; 26, interchanger; 27, interchanger
Embodiment:
Embodiment 1: flow process as shown in Figure 1, slag continuously flows into the top of the pit part vent peg 2 of tundish 1 by slag runner or the slag chute that is connected with slag runner, through 2 N that send into pit part
2Or air makes slag saturated by gas under the condition that is bordering on the slag emulsified state; after the slag 4 that gas is saturated reaches the liquid level of regulation; by head is that the supersonic airstream of spray gun 5 ejections of the oval or circular laval nozzle of flat-section is taken slag and entered granulation Heat Room 6 from exporting 3; enlarged portion at slag exit 3; slag gas two phase flow thigh is expanded expansion downwards; the slag limit is by the air-flow granulation; conduct heat to gas phase in the limit; and in the downward axial main flow of top, granulation chamber formation high speed; this main flow and the jet mill 9 that the high velocity air that sprays into through nozzle 7 from circulating line 8 forms make slag particle grind district's 10 further granulations.Warm sludge grain and hot gas cause the strike plate 15 of two-phase mixing jet high speed impact 11 crushiing chamber bottoms and form impact grinding 14 through accelerating nozzle 13.Slag particle is by broken refinement once more, and further enhanced heat exchange effect.Is the primary condition of flow process direct motion with suitable slag tolerance than guaranteeing that granulation chamber temperature of lower is not higher than 900 ℃.Stretch into the pneumatic trap 12 capture slag particles on crushiing chamber top and the mixture of gas and tangentially send into cyclonic separator 16 through pipeline.The hot blast that separates slag particle is sent into interchanger 26 through pipeline.Sending into circulating line through 26 refrigerative gases recycles.The warm sludge grain then drains into two cold fluidized-beds 18 by a heat grain relief outlet of 16.18 below is sent into cold air via circulating line 20, admission piece 19 and is evenly shunted from bottom to top by porous awl 21, and 18 top is evenly shunted by the porous plate 24 of giving vent to anger, and connects straight tube through hot blast outlet nozzle 22, circulating line 23 and sends into interchanger 27.Being back to circulating line 8 through 27 refrigerative gases recycles.The cooled slag particle of two cold fluidized-beds is discharged through slag sand outlet 25.Two cold fluidized-beds adopt 2～3 grades of multistage modes of low pressure loss type possibly.Whether interchanger 26,27 unites two into one, and depends on the temperature difference size of a cold-peace two cold gained hot blasts.
Embodiment 2: in the flow process, under the prerequisite that guarantees higher heat exchange efficiency, directly save 18-25,27 equipment components and content in the technology as shown in Figure 1, directly obtain the granulation slag particle at 17 places, 26 places directly obtain waste heat.
Claims (10)
1. blast furnace slag dry-type sensible heat recovery system; it is made up of slag tundish, granulation Heat Room, crushiing chamber, two cold fluidized-beds and interchanger five parts; it is characterized in that; adopt high velocity air that high-temperature liquid state blast furnace slag in the tundish is taken out of; in the granulation Heat Room, realized slag particlesization and gas-solid enhanced heat exchange by the high-speed jet bump; slag particle is further entered two cold fluidized-beds and is carried out secondary heat exchange after the impact grinding in crushiing chamber; hot gas realizes that by interchanger sensible heat reclaims after twice heat exchange, and obtains even fine finished product slag.
2. the production technique of a blast furnace slag dry-type sensible heat recovery system as claimed in claim 1; it is characterized in that whole production technology comprises that slag tundish heat preservation method, spray gun slag take technology, slag multiple jets granulation heat-exchanging process, impact grinding disintegrating process and two cold fluidized-bed heat recovering process out of.
3. the production technique of blast furnace slag dry-type sensible heat recovery system as claimed in claim 2 is characterized in that, described slag tundish heat preservation method contains slag nitrogen flushing saturation process.
4. the production technique of blast furnace slag dry-type sensible heat recovery system as claimed in claim 2 is characterized in that, it is with the spray gun slag liquid level that submerges that described spray gun slag is taken technology out of, controls out the quantity of slag by the altitude mixture control of nozzle and outlet at bottom, passes to N in the spray gun
2Or the air supersonic jet, slag taken out of blow radionization simultaneously.
5. the production technique of blast furnace slag dry-type sensible heat recovery system as claimed in claim 2; it is characterized in that; described slag multiple jets granulation heat-exchanging process is to utilize multiple jets with the whole granulations of slag in the granulation Heat Room, and is cooled to rapidly below 950 ℃.
6. the production technique of blast furnace slag dry-type sensible heat recovery system as claimed in claim 2 is characterized in that, described impact grinding disintegrating process is to pulverize the high temperature slag particle secondary granulation heat exchange of district with granulation.
7. the production technique of blast furnace slag dry-type sensible heat recovery system as claimed in claim 2 is characterized in that, described two cold fluidized-bed heat recovering process are that 400-600 ℃ the slag particle that comes out in the pulverizing district is carried out the secondary heat recuperation.
8. spray gun slag as claimed in claim 4 is taken technology out of, it is characterized in that, the slag outlet is shape in the Lavalle under the tundish.
9. slag multiple jets granulation heat-exchanging process as claimed in claim 5 is characterized in that, inserting up and down at the granulation Heat Room, the high velocity air spray gun of each symmetrical annular radial arrangement more than three forms jet mill.
10. impact grinding disintegrating process as claimed in claim 6 is characterized in that, slag particle quickens the two phase flow nozzle by the outlet of granulation Heat Room through high pressure and forms the strike plate formation impact grinding that the high-speed jet impact is located at the crushiing chamber bottom in the granulation Heat Room.
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| CN102424867A (en) * | 2011-12-31 | 2012-04-25 | 钢铁研究总院 | Slag granulating and waste heat recovery device |
| CN102443662A (en) * | 2011-10-14 | 2012-05-09 | 无锡市东方环境工程设计研究所有限公司 | Treatment device of liquid slag |
| CN102719578A (en) * | 2012-06-28 | 2012-10-10 | 田鹏飞 | Method for cooling and utilizing high-temperature liquid industrial waste residues |
| CN102719579A (en) * | 2012-05-31 | 2012-10-10 | 四川川润股份有限公司 | Fluidized heat exchange device after slag of dry type granulating blast furnace |
| CN103740870A (en) * | 2013-12-16 | 2014-04-23 | 北京中冶设备研究设计总院有限公司 | Blast furnace slag sensible heat recovery device |
| CN103940251A (en) * | 2014-05-14 | 2014-07-23 | 许宁 | Slag dry quenching waste heat recycling device and method |
| CN106989608A (en) * | 2017-04-18 | 2017-07-28 | 南京工业大学 | A kind of metallurgical liquid slag residual neat recovering system of hot blast dynamical type granulation and method |
| CN108330237A (en) * | 2017-09-27 | 2018-07-27 | 中能立化科技有限公司 | A kind of slag stream conveying device and slag granulating take hot systems |
| CN108441590A (en) * | 2018-05-09 | 2018-08-24 | 吕艳 | Continuous thin layer single layer hot application method blast furnace slag dry granulation device and application method |
| CN108870994A (en) * | 2018-07-20 | 2018-11-23 | 东北大学 | The residual neat recovering system and method for liquid blast furnace |
| CN109028979A (en) * | 2018-06-29 | 2018-12-18 | 东北大学 | Liquid magnesium chloride residual neat recovering system and method |
| CN110218100A (en) * | 2019-07-20 | 2019-09-10 | 兰州理工大学 | A kind of method that nickel-iron smelting high-temperature slag prepares hollow ceramic microspheres |
| CN111270026A (en) * | 2020-02-04 | 2020-06-12 | 北京科技大学 | Blast furnace slag dry type waste heat recovery system and method |
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| CN102443662A (en) * | 2011-10-14 | 2012-05-09 | 无锡市东方环境工程设计研究所有限公司 | Treatment device of liquid slag |
| CN102424867B (en) * | 2011-12-31 | 2013-07-31 | 钢铁研究总院 | Slag granulating and waste heat recovery device |
| CN102424867A (en) * | 2011-12-31 | 2012-04-25 | 钢铁研究总院 | Slag granulating and waste heat recovery device |
| CN102719579A (en) * | 2012-05-31 | 2012-10-10 | 四川川润股份有限公司 | Fluidized heat exchange device after slag of dry type granulating blast furnace |
| CN102719578A (en) * | 2012-06-28 | 2012-10-10 | 田鹏飞 | Method for cooling and utilizing high-temperature liquid industrial waste residues |
| CN103740870A (en) * | 2013-12-16 | 2014-04-23 | 北京中冶设备研究设计总院有限公司 | Blast furnace slag sensible heat recovery device |
| CN103740870B (en) * | 2013-12-16 | 2015-07-22 | 北京中冶设备研究设计总院有限公司 | Blast furnace slag sensible heat recovery device |
| CN103940251A (en) * | 2014-05-14 | 2014-07-23 | 许宁 | Slag dry quenching waste heat recycling device and method |
| CN106989608B (en) * | 2017-04-18 | 2023-04-28 | 南京工业大学 | Hot air power type granulating metallurgical liquid slag waste heat recovery system and method |
| CN106989608A (en) * | 2017-04-18 | 2017-07-28 | 南京工业大学 | A kind of metallurgical liquid slag residual neat recovering system of hot blast dynamical type granulation and method |
| CN108330237A (en) * | 2017-09-27 | 2018-07-27 | 中能立化科技有限公司 | A kind of slag stream conveying device and slag granulating take hot systems |
| CN108441590A (en) * | 2018-05-09 | 2018-08-24 | 吕艳 | Continuous thin layer single layer hot application method blast furnace slag dry granulation device and application method |
| CN109028979A (en) * | 2018-06-29 | 2018-12-18 | 东北大学 | Liquid magnesium chloride residual neat recovering system and method |
| CN109028979B (en) * | 2018-06-29 | 2019-10-01 | 东北大学 | Liquid magnesium chloride residual neat recovering system and method |
| CN108870994B (en) * | 2018-07-20 | 2019-10-25 | 东北大学 | The residual neat recovering system and method for liquid blast furnace |
| CN108870994A (en) * | 2018-07-20 | 2018-11-23 | 东北大学 | The residual neat recovering system and method for liquid blast furnace |
| CN110218100A (en) * | 2019-07-20 | 2019-09-10 | 兰州理工大学 | A kind of method that nickel-iron smelting high-temperature slag prepares hollow ceramic microspheres |
| CN111270026A (en) * | 2020-02-04 | 2020-06-12 | 北京科技大学 | Blast furnace slag dry type waste heat recovery system and method |
| CN114887736A (en) * | 2022-06-02 | 2022-08-12 | 江苏百泰制药装备科技有限公司 | Medicament crushing apparatus for preparing superfine biological pharmaceutical powder |
| CN114887736B (en) * | 2022-06-02 | 2023-08-25 | 江苏百泰制药装备科技有限公司 | Medicament crushing equipment for preparing superfine biopharmaceutical powder |
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