CN103484580B - Method and device for recovering molten blast furnace slag sensible heat - Google Patents
Method and device for recovering molten blast furnace slag sensible heat Download PDFInfo
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- CN103484580B CN103484580B CN201310421159.6A CN201310421159A CN103484580B CN 103484580 B CN103484580 B CN 103484580B CN 201310421159 A CN201310421159 A CN 201310421159A CN 103484580 B CN103484580 B CN 103484580B
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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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- 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
- Y02P10/25—Process efficiency
Abstract
The invention belongs to the technical field of energy recovery, and particularly relates to a method and device for recovering molten blast furnace slag sensible heat. The process of the method sequentially includes the following steps that (1) blast furnace slag enters a segmented bottom blowing composite molten slag trough, compressed air is blown in from the bottom of the bottom blowing composite molten slag trough, and at the moment a heat accumulator is heated to be within the range from 1100 DEG C to 1250 DEG C; (2) molten slag of which the temperature is reduced to be within the range of 700 DEG C to 800 DEG C enters an old slag processing system through a connecting unit, and then follow-up processing is conducted on slag; (3) when slag stops being discharged from a blast furnace, air is still blown in from the bottom of the bottom blowing composite molten slag trough, and air is heated to be within the range from 800 DEG C to 900 DEG C when passing through the heat accumulator; (4) hot air is used for power generation after being dedusted, and then cooling water replaces heat for production. Compared with the prior art, the method and device have the advantages that through the improvement, heat can be efficiently recovered, the temperature of combustion air by a hot blast heater can be increased, the device and method can be also used for waste heat power generation, and then the purpose of energy reutilization is achieved.
Description
Technical field
The invention belongs to ferrous metallurgy energy-saving and emission-reduction, secondary energy recovery technology field, particularly a kind of method and device thereof reclaiming molten blast furnace slag sensible heat.
Background technology
Iron And Steel Industry is the important foundation industry of Chinese national economy, fast-developing from the Iron And Steel Industry of China since the nineties in 20th century, crude steel output in 2012 reaches 7.2 hundred million tons, wherein blase furnace cast iron (namely long flow process crude steel is produced) output is close to 6.59 hundred million tons, along with the growth of iron and steel output, the total amount that Iron And Steel Industry produces solid waste gets more and more, in solid waste, blast furnace slag account for again very large ratio.The quantity discharged of blast furnace slag with ore grade and smelting process difference and change.In general, when furnace charge grade reaches 60% ~ 66%, be often smelt 1 ton of pig iron and will produce slag 250 ~ 300 kilograms, calculate by this, the annual blast furnace slag output of China is also at about 1.65 ~ 1.98 hundred million tons.
The energy consumption of Iron And Steel Industry simultaneously accounts for again 10% ~ 15% of national total energy consumption, Steel Production Flow Chart main is at present long flow process, namely coking process, sintering circuit, blast furnace ironmaking operation, converter steelmaking operation and steel rolling process is comprised, and the resource of blast furnace ironmaking operation and energy expenditure are all maximum, account for again about 77% of whole Iron and Steel Production operation.The tapping temperature of blast furnace slag is generally at 1400 DEG C ~ 1500 DEG C, and the heat namely contained by 1 ton of blast furnace slag is equivalent to 64kg standard coal, calculates China like this and takes away heat because of blast furnace slag every year and be equivalent to 1056 ~ 1267.2 tons of standard coals.
Current China blast-furnace cement sensible heat utilization ratio is extremely low, and most enterprises all adopts grain slag treatment process, and so-called utilization is exactly Northern Enterprises warms oneself with blast furnace slag quenching water winter, owing to being subject to the restriction for the condition such as thermal region, flow, and washing slag water contains a large amount of alkaline matter to the factor such as pump and corrosive pipeline, slag heat utilization rate is extremely low, and Er Qiechun, summer, three seasons of autumn can not adapt to, and the impact of a large amount of hot water, steam is produced.Therefore the Exposure degree of blast furnace slag is very important problem, in the urgent need to address.
Summary of the invention
The object of this invention is to provide a kind of method and the device thereof that reclaim molten blast furnace slag sensible heat, under the prerequisite not changing existing most of blast furnace water slag-flushing technique, reclaiming the sensible heat of blast furnace slag, the object of reusing of energy source by reaching the transformation of melting slag runner.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of method reclaiming molten blast furnace slag sensible heat, its flow process is carried out in order as follows: the blast furnace slag 1) temperature being reached 1400 ~ 1500 DEG C enters the bottom blowing composite molten slag runner of segmentation, the pressurized air of 1.5 ~ 2.0MPa is blown into bottom bottom blowing composite molten slag runner with the speed of 8 ~ 10 meter per seconds simultaneously, slag is stirred while guarantee slag fluidity, realize the radiant heat absorbent of bottom blowing composite molten slag runner top accumulation of heat masonry, at this moment heat storage is heated to 1100 ~ 1250 DEG C; 2) be that the slag that temperature is reduced to 700 ~ 800 DEG C enters old slag disposal system by connector element, subsequent disposal is done to slag; 3) be that be still blown into air bottom bottom blowing composite molten slag runner, air is heated to 800 ~ 900 DEG C in by the process of heat storage when blast furnace stops slagging tap; 4) be used for generating by introducing boiler of power generation by waste heat after warm air dedusting, the water coolant of slag runner by interchanger displacement heat for the production of.
The combustion air that also can be used as hotblast stove after described warm air dedusting is utilized.
Described bottom blowing composite molten slag runner, it is characterized in that, comprise the outer slag runner of cement, the support of ditch body, ditch body and operculum colpi, the bottom of the outer slag runner of cement is provided with ditch body and supports, the top that ditch body supports is provided with the ditch body and operculum colpi that refractory materials makes, the internal surface of operculum colpi is provided with accumulation of heat masonry, slag runner is surrounded between ditch body and operculum colpi, copper cooling wall is provided with bottom ditch body, water-cooled tube is established in copper cooling wall, the bottom of copper cooling wall is provided with bottom blowing blast main, and bottom blowing blast main is provided with injection tube and upwards communicates with slag runner.
Compared with prior art, the invention has the beneficial effects as follows:
Present method not only can efficient recovery molten blast furnace slag sensible heat, and existing slag disposal system can be made full use of, realize can to improve hotblast stove combustion air temperature again by high efficiente callback heat energy by the local flow improvement of blast furnace discharge yard, also can be used for cogeneration, reach the object of reusing of energy source.
Accompanying drawing explanation
Fig. 1 is bottom blowing composite molten slag runner example structure schematic diagram of the present invention;
Fig. 2 is the schematic diagram of one of the invention process flow process;
Fig. 3 is the schematic diagram of the invention process flow process two.
In figure: the outer slag runner 2-ditch body of 1-cement supports 3-ditch body 4-operculum colpi 5-accumulation of heat masonry 6-slag runner 7-copper cooling wall 8-water-cooled tube 9-bottom blowing blast main 10-injection tube 11-blast furnace 12-bottom blowing composite molten slag runner 13-connector element 14-interchanger 15-boiler of power generation by waste heat 16-fly-ash separator
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
See Fig. 1, it is bottom blowing composite molten slag runner example structure schematic diagram of the present invention, comprise the outer slag runner 1 of cement, ditch body supports 2, ditch body 3 and operculum colpi 4, the bottom of the outer slag runner 1 of cement is provided with ditch body and supports 2, the top that ditch body supports 2 is provided with the ditch body 3 and operculum colpi 4 that refractory materials makes, the internal surface of operculum colpi 4 is provided with accumulation of heat masonry 5, slag runner 6 is surrounded between ditch body 3 and operculum colpi 4, copper cooling wall 7 is provided with bottom ditch body 3, water-cooled tube 8 is established in copper cooling wall 7, the bottom of copper cooling wall 7 is provided with bottom blowing blast main 9, bottom blowing blast main 9 is provided with injection tube 10 and upwards communicates with slag runner 6.Water-cooled tube 8 connects interchanger and carries out energy recovery, bottom blowing blast main 9 is connected with gas blower, physical property according to molten blast furnace slag: heat transfer rate is slow, viscosity sharply rises high along with temperature reduces, answer quantity and the position of reasonable Arrangement injection tube 10, make the radiant heat of molten blast furnace slag be absorbed by heat storage and suitable mobility can be kept.
See Fig. 2, it is the schematic diagram of one of a kind of method implementing procedure reclaiming molten blast furnace slag sensible heat of the present invention, absorbed by the radiant heat of bottom blowing composite molten slag runner to molten blast furnace slag, thermal exchange produces warm air and hot water, realize the object that blast-furnace cement sensible heat reclaims, 1) the blast furnace slag first temperature that blast furnace 11 is discharged being reached 1400 ~ 1500 DEG C enters the bottom blowing composite molten slag runner 12 of segmentation, the pressurized air of 1.5 ~ 2.0MPa is blown into bottom bottom blowing composite molten slag runner with the speed of 8 ~ 10 meter per seconds simultaneously, slag is stirred while guarantee slag fluidity, realize the radiant heat absorbent of bottom blowing composite molten slag runner top accumulation of heat masonry, at this moment heat storage is heated to 1100 ~ 1250 DEG C, and the air that bottom is blown into also has more than 900 DEG C in exit, 2) be secondly that the slag that temperature is reduced to 700 ~ 800 DEG C enters old slag disposal system by connector element, subsequent disposal is done to slag, 3) be that be still blown into air bottom bottom blowing composite molten slag runner, air is heated to 800 ~ 900 DEG C in by the process of heat storage when blast furnace stops slagging tap again, 4) be finally slag runner water coolant (about 80 DEG C) by interchanger 14 heat cemented out for the production of, and introduce boiler of power generation by waste heat 15 after warm air dedusting for generating, in figure, boiler of power generation by waste heat prime carries cleaning apparatus.
See Fig. 3, it is a kind of schematic diagram reclaiming the method implementing procedure two of molten blast furnace slag sensible heat of the present invention, absorbed by the radiant heat of bottom blowing composite molten slag runner to molten blast furnace slag, thermal exchange produces warm air and hot water, realize the object that blast-furnace cement sensible heat reclaims, 1) the blast furnace slag first temperature that blast furnace 11 is discharged being reached 1400 ~ 1500 DEG C enters the bottom blowing composite molten slag runner 12 of segmentation, the pressurized air of 1.5 ~ 2.0MPa is blown into bottom bottom blowing composite molten slag runner with the speed of 8 ~ 10 meter per seconds simultaneously, slag is stirred while guarantee slag fluidity, realize the radiant heat absorbent of bottom blowing composite molten slag runner top accumulation of heat masonry, at this moment heat storage is heated to 1100 ~ 1250 DEG C, and the air that bottom is blown into also has more than 900 DEG C in exit, 2) be secondly that the slag that temperature is reduced to 700 ~ 800 DEG C enters old slag disposal system by connector element, subsequent disposal is done to slag, 3) be that be still blown into air bottom bottom blowing composite molten slag runner, air is heated to 800 ~ 900 DEG C in by the process of heat storage when blast furnace stops slagging tap again, 4) be finally slag runner water coolant (about 80 DEG C) by interchanger 14 heat cemented out for the production of, the combustion air of warm air as hotblast stove after fly-ash separator 16 is utilized.
Claims (3)
1. one kind is reclaimed the method for molten blast furnace slag sensible heat, it is characterized in that, its flow process is carried out in order as follows: the blast furnace slag 1) temperature being reached 1400 ~ 1500 DEG C enters the bottom blowing composite molten slag runner of segmentation, the pressurized air of 1.5 ~ 2.0MPa is blown into bottom bottom blowing composite molten slag runner with the speed of 8 ~ 10 meter per seconds simultaneously, slag is stirred while guarantee slag fluidity, realize the radiant heat absorbent of bottom blowing composite molten slag runner top heat storage, at this moment heat storage is heated to 1100 ~ 1250 DEG C; 2) be that the slag that temperature is reduced to 700 ~ 800 DEG C enters old slag disposal system by connector element, subsequent disposal is done to slag; 3) be that be still blown into air bottom bottom blowing composite molten slag runner, air is heated to 800 ~ 900 DEG C in by the process of heat storage when blast furnace stops slagging tap; 4) be used for generating by introducing boiler of power generation by waste heat after warm air dedusting, the water coolant of slag runner by interchanger displacement heat for the production of.
2. a kind of method reclaiming molten blast furnace slag sensible heat according to claim 1, it is characterized in that, the combustion air that also can be used as hotblast stove after described warm air dedusting is utilized.
3. the bottom blowing composite molten slag runner mentioned in method described in claim 1, it is characterized in that, comprise the outer slag runner of cement, the support of ditch body, ditch body and operculum colpi, the bottom of the outer slag runner of cement is provided with ditch body and supports, the top that ditch body supports is provided with the ditch body and operculum colpi that refractory materials makes, the internal surface of operculum colpi is provided with accumulation of heat masonry, slag runner is surrounded between ditch body and operculum colpi, copper cooling wall is provided with bottom ditch body, water-cooled tube is established in copper cooling wall, the bottom of copper cooling wall is provided with bottom blowing blast main, and bottom blowing blast main is provided with injection tube and upwards communicates with slag runner.
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| CN201310421159.6A CN103484580B (en) | 2013-09-13 | 2013-09-13 | Method and device for recovering molten blast furnace slag sensible heat |
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| CN201310421159.6A CN103484580B (en) | 2013-09-13 | 2013-09-13 | Method and device for recovering molten blast furnace slag sensible heat |
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| CN103484580B true CN103484580B (en) | 2014-12-31 |
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| CN105400918A (en) * | 2015-12-30 | 2016-03-16 | 中冶南方工程技术有限公司 | Cover plate for slag-iron runner of blast furnace |
| CN108278904B (en) * | 2017-01-05 | 2020-10-30 | 北京金熔节能环保科技有限公司 | High-temperature smelting slag waste heat recovery device and method |
| CN108870350B (en) * | 2018-07-19 | 2021-03-05 | 北京金熔节能环保科技有限公司 | Tunnel type high-temperature slag waste heat dry-method recovery device and method |
| CN111637776A (en) * | 2020-06-12 | 2020-09-08 | 东北大学 | Multi-level phase change recycling and storing device for waste heat of metallurgical high-temperature slag |
| CN114774603B (en) * | 2022-04-29 | 2024-01-30 | 马鞍山钢铁股份有限公司 | Recycling system of high-temperature radiant heat of blast furnace tapping channel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4426067A (en) * | 1983-01-07 | 1984-01-17 | The Calumite Company | Metallic sectional liquid-cooled runners |
| JPS62156213A (en) * | 1985-12-27 | 1987-07-11 | Sumitomo Metal Ind Ltd | Construction of spout for preliminary refining of molten iron |
| JPH0641606B2 (en) * | 1989-05-26 | 1994-06-01 | 合同製鐵株式会社 | Apparatus and method for slag bath smelting reduction production of ferrous alloy melt |
| CN101886149A (en) * | 2010-07-08 | 2010-11-17 | 无锡市东方环境工程设计研究所有限公司 | High temperature liquid slag recovery method |
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