CN1038198C - Method for recovery from iron and steel slag - Google Patents
Method for recovery from iron and steel slag Download PDFInfo
- Publication number
- CN1038198C CN1038198C CN94107284A CN94107284A CN1038198C CN 1038198 C CN1038198 C CN 1038198C CN 94107284 A CN94107284 A CN 94107284A CN 94107284 A CN94107284 A CN 94107284A CN 1038198 C CN1038198 C CN 1038198C
- Authority
- CN
- China
- Prior art keywords
- steel slag
- iron
- tin
- heat exchange
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/064—Thermally-conductive removable bodies, e.g. balls
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
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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
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The present invention relates to a novel method for the latent heat recovery of steel slag. Liquid metal tin is used as a heat carrier and is used for carrying out direct contact type heat exchange with pellet-shaped liquid or solid steel slag to recover the high-temperature latent heat of the steel slag. The heated liquid tin generates vapor through a waste heat boiler and is used for generating electricity. The heat carrier and the steel slag in the method carry out circulating heat exchange, and a recovery rate is higher than recovery rates of a wind breaking method and an annular bed method.
Description
The present invention relates to a kind of novel method that reclaims iron and steel slag waste heat.
Will produce a large amount of slags in Iron and Steel Production, one ton of pig iron of every production is wanted 0.3～0.6 ton of slag of by-product, and one ton of steel of every production is wanted 0.13 ton of slag of by-product, and the temperature of these liquid steel scums is up to 1400～1600 ℃, and slag per ton contains (126 * 188) * 10
4The sensible heat of KJ is equivalent to the energy of 30～40Kg heavy oil.Mainly produce steel country as Japan, the U.S. at present, Britain, Germany and Sweden are from the seventies, from energy-conservation and viewpoint environmental protection, active development slag resource, the country that has has also set up functional body for this reason, " the iron and steel slag sensible heat comprehensive utilization technique council " as Japan, the sensible heat recovery method of also the comprehensive utilization of slag technology being classified as the present slag of emphasis scientific research task of Ministry of International Trade and Industry roughly is divided into two classes: a class is to utilize recirculated air to reclaim the slag sensible heat, then by the form recovery sensible heat of waste heat boiler, as wind crush method with steam.Another kind of is that high temperature furnace slag is injected in the container, around container cools off with water cycle, reclaim the slag sensible heat with vapor form, as annular bed method, no matter above-mentioned which kind of method still is in the type approval test stage at present abroad, few near the industrial application level, most of Steel Plant of China then adopt water quenching, utilize the heating of flushing cinder water in the winter time, its heat utilization efficiency only is about 10%.
Purpose of the present invention is just in order to provide a kind of simple and easy to do, the novel method that the rate of recovery is high
The objective of the invention is to realize: make it become pelletizing through Fitz chilsonator earlier the iron and steel slag by following concrete measure, reusable liquid tin sprays after the cooling the iron and steel slag as thermal barrier, liquid tin and iron and steel slag carry out mixed heat transfer, heated liquid tin heats soft water by the recycle system to waste heat boiler, become saturation steam with the liquid tin heat exchange again after the deoxygenation of round-robin soft water, be used for generating.Iron and steel slag after the heat release is by the further heat exchange and adherent liquid tin on it collected back in the tin recycle system of slagging device and recirculated water (or thermal oil).
Below by accompanying drawing the present invention is elaborated:
Fig. 1 is the schematic flow sheet of present method.
In steel manufacture process, high temperature (1400～1600 ℃) the liquid iron and steel slag that blast furnace or converter 1 by-product go out is poured in the storage slag ladle 3 by slag waggon 2, because it is enough capacity that the storage slag ladle has, the deslagging of interruption is become in native system continuously, the slag of discharging from the storage slag ladle becomes the liquid agglomerate with certain volume through Fitz chilsonator 4, in the process that agglomerate descends, the tensile effect owing to the liquid table forms the pelletizing with certain particle size aloft.At this moment the thermal barrier that sprays out from the A pipe---liquid metal tin sprays cooling to pelletizing shape liquid steel scum.Because the thermal conductivity of tin is good, the iron and steel slag surface of pelletizing shape condensation rapidly forms the spherical iron and steel slag of surperficial duricrust shape, and the pelletizing of iron and steel slag splashes at last in the liquid metal tin in the direct contact heat exchanger 24 and makes further directly mixed heat transfer with liquid metal tin
The bottom that can sink to direct contact heat exchanger 24 greatly than weight (as the particle of iron and steel matter) in the iron and steel slag, and by slag unloading device 5 discharges, transport by conveyor 6.Vitreous iron and steel slag is owing to proportion floats over above the tin liquor less than liquid tin, carry out direct contact heat-exchanging with liquid tin, accelerated this heat transfer process by the tin liquor that the A pipe sprays, the liquid steel scum is cooled to it below transition temperature and become the iron and steel slag of solid-state pelletizing shape in direct contact heat exchanger 24, conveying by handling machinery 26, after the iron and steel slag has been finished direct contact heat-exchanging with liquid tin, by slag unloading device 7, chute 8 enters in the direct contact heat exchanger 10, do further heat exchange with recirculated water wherein, deliver to conveyor 17 by slag unloading device 11 at last and transport.
The iron and steel slag that ball closes shape is carrying out will adhering to some tin liquors unavoidably in the direct heat exchange process with tin liquor, can tin be collected the back by the oscillating action of tin collector 9 and flow in the tin storage tank 12.
The recirculated water that is heated by solid-state iron and steel slag pelletizing in direct contact heat exchanger 10 is at interchanger H
5In the soft water sent here with pump 22 carry out heat exchange, heated soft water is by interchanger H
2Do further to be sent to deoxygenation in the deoxygenator 15 after the heating, pump 16 pumps into interchanger H after the soft water after the deoxidation is pressurizeed
6In with direct contact heat exchanger 24 in effusive heated liquid tin carry out heat exchange soft water at interchanger H
6Become steam state by liquid state behind the middle absorption heat and enter drum 18, the saturation steam of generation is by interchanger H
3Be heated to form superheated vapour and be used for pushing turbine 20 generating, the exhaust steam after the generating becomes water of condensation in condenser 21, flow into cycle operation in the soft water storage tank 23.
By direct contact heat exchanger 10 effusive hot water process interchanger H
5With enter boiler 14 after the soft water heat exchange, finish hot water circulation by the effect of pump 13.The also available thermal oil of recirculated water in present method replaces.
Liquid tin is at interchanger H
1Inflow heat exchanger H behind the sensible heat of middle absorption high temperature sludge
6In, emit heat at this soft water vaporized, the heat exchange postcooling tin liquor enter in the tin storage tank 12, send into interchanger H by pump 25 pumps to A pipe and B pipe again
1In finish the circulation of liquid tin
When native system brings into operation, tin in the tin storage tank by interchanger H
8Send by pump 25 after the heat fused.Tin liquor all flows in the tin storage tank when system is out of service.In order to reduce the oxidational losses of liquid metal tin, nitrogen can be fed interchanger H
1With carry out gas shield in the tin storage tank,
The iron and steel slag is because of its severe difference, visual its in liquid tin floating situation and discharge by slag unloading device 5,7,11 respectively, and in tapping process, carry out the collection and the recovery of tin liquor, when big proportion slag increases, can increase by a cover circulating water system for 5 times again to reclaim its waste heat at slag unloading device.
Claims (1)
1. a method for recovery from iron and steel slag uses tin to cut out body as heat, and the invention is characterized in: the iron and steel slag makes it become the liquid agglomerate through Fitz chilsonator earlier, and reusable liquid tin directly carries out mixed heat transfer with the cooling of iron and steel slag spray and with liquid tin; The liquid tin that adheres on the iron and steel slag by collector with its collection and send into and be used for cycle heat exchange in the storage tank, enter direct contact heat exchanger and recirculated water or thermal oil with iron and steel slag after the liquid tin heat exchange and carry out secondary heat exchange, heated soft water is by the deoxygenator deoxygenation in the secondary heat exchange, carry out becoming after the heat exchange gasiform bubble and steam with liquid tin again, be used for generating after finally becoming superheated vapour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94107284A CN1038198C (en) | 1994-06-28 | 1994-06-28 | Method for recovery from iron and steel slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94107284A CN1038198C (en) | 1994-06-28 | 1994-06-28 | Method for recovery from iron and steel slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1099069A CN1099069A (en) | 1995-02-22 |
| CN1038198C true CN1038198C (en) | 1998-04-29 |
Family
ID=5032912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94107284A Expired - Fee Related CN1038198C (en) | 1994-06-28 | 1994-06-28 | Method for recovery from iron and steel slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1038198C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101619367B (en) * | 2009-07-28 | 2010-12-01 | 中钢集团鞍山热能研究院有限公司 | Melting iron and steel slag heat energy recovery method and device |
| CN102212627B (en) * | 2011-04-27 | 2013-01-02 | 四川大西绿建科技有限公司 | Device for crushing steel slag and recovering heat |
| CN102304594B (en) * | 2011-09-29 | 2014-12-03 | 魏明 | Slag-pot-movable water quenching system utilizing excess heat of molten slag based on water quenching steam method |
| CN102392085B (en) * | 2011-11-21 | 2013-04-03 | 济南钢铁股份有限公司 | Blast furnace slag waste heat recycling system |
| CN104279551A (en) * | 2013-07-09 | 2015-01-14 | 北京亿玮坤节能科技有限公司 | Method and system for heating power plant condensate water or supplementing water through blast furnace slag flushing water |
| CN104962670B (en) * | 2015-07-14 | 2017-05-17 | 中冶南方工程技术有限公司 | Method for recovering waste heat of melting slag |
| CN106755666A (en) * | 2017-02-28 | 2017-05-31 | 上海大学 | slag treatment and heat energy utilization method and device |
-
1994
- 1994-06-28 CN CN94107284A patent/CN1038198C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1099069A (en) | 1995-02-22 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |