CN102453779A - Method for recycling waste heat and scrap steel of high-temperature melting slag in metallurgical furnace - Google Patents
Method for recycling waste heat and scrap steel of high-temperature melting slag in metallurgical furnace Download PDFInfo
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- CN102453779A CN102453779A CN2010105292101A CN201010529210A CN102453779A CN 102453779 A CN102453779 A CN 102453779A CN 2010105292101 A CN2010105292101 A CN 2010105292101A CN 201010529210 A CN201010529210 A CN 201010529210A CN 102453779 A CN102453779 A CN 102453779A
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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
- 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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Abstract
The invention relates to a method for recycling waste heat and scrap steel of high-temperature melting slag in a metallurgical furnace. The method comprises the following steps of: (1) steam breaking: impacting high-temperature melting slag into pieces with high pressure steam and cooling the slag pieces into thinner slag particles; (2) waste heat recycling: introducing steam into a treatment tower and carrying out heat exchange between the steam and the slag particles in the treatment tower to produce superheated steam; and (3) dedusting with a cloth bag and steam generation, wherein the superheated steam enters into a steam generating device after being subjected to cloth bag dedusting treatment, steam-water heat exchange is carried out in the steam generating device and then the high pressure steam used for steam breaking and the steam used for recycling waste heat are generated. Steam breaking is adopted in the method, oxidation ratio of scrap steel is reduced; the steam is adopted as a heat exchange medium during waste heat recycling, and direct heat exchange is carried out between steam and water and the efficiency is high. About 12% of scrap steel in the slag particles can be recycled, sensible heat of the high-temperature melting slag is recycled to produce the steam and realize cyclic utilization, and the sensible heat, ferrous waste and waste residue resource which are contained in the high-temperature melting slag are completely and thoroughly recycled.
Description
Technical field
The present invention relates to high-temperature molten slag recovery technology field; Relate in particular to a kind of metallurgical furnace high-temperature molten slag waste heat steel scrap recovery method; Be mainly used in the processing of high-temperature liquid state slag; To reclaim iron and steel scrap, sensible heat and residue resource wherein, be particularly useful for reclaiming the recycling of converter slag like steel industry, electric furnace slag, blast furnace slag etc.
Background technology
The temperature of the high-temperature molten slag of steel industry generally reaches 2000 ℃; Contain a certain proportion of iron and steel scrap in the slag; Waste residue behind the recovery iron and steel scrap can also or be used to pave the way as the raw material of producing cement, this shows, is containing a large amount of sensible heats, iron and steel scrap and residue resource in the high-temperature molten slag.Producing about 200,000 tons of steel scraps per year with a 100T electric furnace is example, and about 300,000,000,000 KJ of the sensible heat heat that it contains (kilojoule) can produce about 5.74 ten thousand tons of steam every year; Iron and steel scrap content can reach 12% in the slag, if all reclaim then 2.4 ten thousand tons of annual recyclable steel scraps; The annual production of its waste residue is about more than 17.6 ten thousand tons, if can improve its value added, interests are also very considerable.
Usually adopt the flush slag device to come high-temperature molten slag is handled traditionally; Be that high-temperature molten slag gets into detritus pool earlier after the high pressure water shrend; Be made for to producing cement or paving the way the raw material use after afterwards the grain slag in the detritus pool being salvaged out dehydration; And the water in the detritus pool cools off in the cooling tower through filtering to be sent into by the pump pressurization then earlier, is used for afterwards high-temperature molten slag is carried out shrend again, can realize recycling of water like this.Water loss must be replenished by new water.There are a lot of problems in this flush slag device, and wherein maximum problem is that water consumption is too many, a large amount of heats that secondly have been the flush slag processes waste, and surrounding environment also brought pollution.
All drawbacks in view of traditional water flushing cinder technology; People have proposed dry granulation and energy recovery technology thereof in recent years; Its technical scheme is: molten blast furnace slag carries out earlier heat exchange in pelletizer; And then carry out heat through vibrating bed and reclaim for the second time, in fluidized-bed, carrying out the recovery for the third time of heat at last, the heat energy of recovery is reused or energy transformation with the form of hot blast or generating.Dry granulation and energy recovery technology thereof are owing to adopt the mechanical force of mechanism that high-temperature molten slag is smashed; Mechanism need be provided; And the energy to the recovery of high-temperature molten slag sensible heat can not directly be used to drive this mechanism usually; Make whole apparatus structure complicated, energy consumption is high, can not fully reclaim and utilize the sensible heat of high-temperature molten slag.
In addition, at present to the recovery technology of high-temperature molten slag, only reclaim wherein a kind of in sensible heat, steel scrap and the waste residue usually.Reclaim the melting slag sensible heat and adopt the dry granulation technology usually, reclaim steel scrap and adopt hot vexed slag technology usually, improve the waste residue added value and adopt wind crush method usually.The recyclable steel scrap 10% of the vexed slag of heat, the slag particle degree that hot vexed slag method generates is little, but composition is very stable, also can be used as building material and uses.The particle diameter of wind crush method waste residue product and materialization controllable component can be used as cement raw material and use.Though the independent use of above-mentioned the whole bag of tricks all can obtain good effect,, these three kinds of methods are incorporated in the same device, with sensible heat, steel scrap and the waste residue of abundant recovery high-temperature molten slag, also there is technical difficulty at present.
Summary of the invention
The present invention mainly solves and adopts mechanism that the technical problem of the sensible heat of high-temperature molten slag is smashed, can not fully reclaimed and utilize to high-temperature molten slag in existing dry granulation and the heat recuperation technology thereof, proposes a kind of with the sensible heat recovery of high-temperature molten slag and the high temperature liquid slag recovery method that recycles.
In order to solve its technical problem, the invention provides a kind of metallurgical furnace high-temperature molten slag waste heat steel scrap recovery method, this method comprises:
(1) vapour is broken: with HP steam high-temperature molten slag is impacted, high-temperature molten slag is smashed and be cooled to thinner solid impurity particle;
(2) waste heat recovery: in treating column, feed steam, carry out heat exchange at steam described in the said treating column and said solid impurity particle, heat exchange produces superheated vapour;
(3) bag-type dust and generation steam: said superheated vapour gets into steam generation device after bag-type dust is handled, and in steam generation device, carries out generating the HP steam of the broken use of the said vapour of confession and the steam of waste heat recovery use behind the steam-water heat exchanging.
Vapour quick short steps of the present invention adopt HP steam to impact pyritous liquid molten slag suddenly, make it broken and are cooled to than fine solid particles, have reduced the oxidation ratio of steel scrap, for the follow-up steel scrap that reclaims is as much as possible laid a good foundation; Waste heat recovery mainly is the heat exchange between solid impurity particle and the steam; The heat that is exchanged further utilizes again to produce steam, and steam internal recycle again is used for the broken and waste heat recovery of vapour, has realized the recycle of high-temperature molten slag sensible heat; And owing to adopt the medium of steam as waste heat recovery; The carbonated drink direct heat exchange, efficient province with high investment is safe and reliable.
Further, metallurgical furnace high-temperature molten slag waste heat steel scrap recovery method of the present invention also comprises, in shallow vexed pond, the solid impurity particle after the waste heat recovery processing is carried out handling in shallow vexed slag 1-2 hour.Shallow vexed slag is handled the composition that can stablize solid impurity particle, more is suitable for the building materials utilization, and further lays the foundation for the subsequent recovery scrap iron.
Further, metallurgical furnace high-temperature molten slag waste heat steel scrap recovery method of the present invention also comprises: the solid impurity particle after earlier shallow vexed slag being handled is salvaged shallow vexed pond, adopts concentration equipment that the scrap iron in the solid impurity particle is filtered out then.About 10% steel scrap in the recyclable solid impurity particle of the present invention, the residue waste residue can be used as the outward transport of building materials purposes.Like this, mainly broken through vapour, the waste heat recovery of the present invention, shallow vexed and magnetic separation process have realized thoroughly reclaiming sensible heat, iron and steel scrap and the residue resource that high-temperature molten slag contained comprehensively.
Description of drawings
Fig. 1 is for realizing the process flow sheet of metallurgical furnace high-temperature molten slag waste heat steel scrap recovery method of the present invention.
Among the figure, 1. deslagging jar, 2. chute, 3. nozzle, 4. treating column, 5. vibrator, 6. sieve plate; 7. baffle plate, 8. sack cleaner, 9. belt, 10. shallow vexed pond, 11. steam heaters, 12. steam accumulators; 13. deoxygenator, 14. service pumps, 15. softening water tanks, 16. excavators, 17. magnetic separation belts, 18. iron and steel scrap; 19. waste residue, 20. slag inlets, 21. slag notches, 22. steam-ins, 23. vapour outlets, 24. wash water valves.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Metallurgical furnace high-temperature molten slag waste heat steel scrap recovery method of the present invention comprises mainly that vapour is broken, waste heat recovery, bag-type dust and generate the steam step.Referring to Fig. 1; The vapour quick short steps are specially suddenly: high-temperature molten slag gets into the treating column 4 through deslagging jar 1 and chute 2 from slag-drip opening successively; Treating column 4 is provided with nozzle 3 in the ingress that high-temperature molten slag gets into treating column 4; The HP steam that comes out from nozzle 3 impacts high-temperature molten slag, high-temperature molten slag stream is smashed be granulated into thinner solid impurity particle.HP steam is preferably saturation steam, and pressure is between 0.6MPa-1.5MPa.When the pressure of HP steam was 0.8MPa, the broken effect of vapour was relatively good, so the pressure of HP steam is preferably 0.8MPa.The vapour quick short steps adopt HP steam to impact pyritous liquid molten slag suddenly, make it broken and are cooled to than fine solid particles, have reduced the oxidation ratio of steel scrap, for the follow-up steel scrap that reclaims is as much as possible laid a good foundation.Tilted-putted sieve plate 6 is set in the treating column 4, vibrator 5 is installed on the sieve plate 6, the solid impurity particle after vapour is broken scatters and drops on the sieve plate 6, and solid impurity particle is transferred out treating column 4 under the oscillating action of vibrator 5.
The waste heat recovery step is specially: steam gets into treating column 4 from the below of sieve plate 6, on sieve plate 6, carries out heat exchange with the solid impurity particle that transfers out treating column 4, and steam becomes superheated vapour after the heat exchange.Since adopt the medium of steam as waste heat recovery, the carbonated drink direct heat exchange, efficient province with high investment is safe and reliable.In order to make follow-up shallow vexed slag step obtain treatment effect preferably, the solid impurity particle temperature after the waste heat recovery processing is controlled between 400 ℃-600 ℃.
The top of treating column 4 is provided with baffle plate 7, and the superheated vapour that heat exchange produces is discharged treating column 4 earlier again behind baffle plate 7 rough dustings in treating column 4.Dedusting and generation steam step are specially: the superheated vapour that comes out from treating column 4 gets into high temperature resistant anti-hydrolysis PPS fabric filter element sack cleaner 8 purifications; High temperature resistant anti-hydrolysis PPS fabric filter element in the sack cleaner 8; Generally can bear the long term operation temperature about 200 ℃, high energy bears 220 ℃ high temperature, and has anti-hydrolysis function; Therefore can direct purification high temperature dust steam; Dust concentration after the purification is reduced to less than 5mg/Nm3 becomes clean high-temperature steam, gets into steam generation device then, in steam generation device, carries out steam-water heat exchanging and generates steam.Steam generation device is the device that is generated steam by superheated vapour and water mixed heat transfer, and steam generation device is a steam heater 11 in the present embodiment, and steam heater 11 can produce the saturation steam that pressure is 0.6MPa-1.5MPa.The saturation steam that steam heater 11 generates gets into steam accumulator 12 continuously and carries out accumulation; Distribute most saturation steam from steam accumulator 12 and be circulated to the steam of treating column 4 next process of participation and the heat exchange of high-temperature molten slag; Here be divided into two strands of steam again: it is rapid that a small gangs of HP steam is used for aforementioned vapour quick short steps, and one big strand gets into from sieve plate 6 belows that treating column 4 is used for aforementioned waste heat recovery step and solid impurity particle carries out heat exchange; And become steam more than needed from another small portion that steam accumulator 12 comes out, can be for external application.The blowdown of steam heater 11 is connected with shallow vexed pond 10 through wash water valve 24, so that recycle sewage resource (water, heat, grit etc.) wherein.It is that steam heater 11 provides feedwater that present embodiment adopts supplementary unit; This supplementary unit comprises softening water tank 15, service pump 14 and the deoxygenator 13 that connects successively; Deoxygenator 13 connects steam heater 11; Supplementary unit is used to steam heater 11 high-quality feedwater is provided, to be used for production of steam.Waste heat recovery of the present invention mainly is the heat exchange between solid impurity particle and the steam; The heat that is exchanged further utilizes again to produce steam; Wherein a part of steam internal recycle is used for the broken and waste heat recovery of vapour, and another part steam outer confession more than needed realized the recycle of high-temperature molten slag sensible heat.
Sieve plate 6 vapour is broken and solid impurity particle that carry out after the heat exchange transfers out treating column 4, and belt 9 is transported to solid impurity particle in the shallow vexed pond 10 subsequently, in shallow vexed pond 10, solid impurity particle is carried out shallow vexed slag and handles.The structure in shallow vexed pond 10 and principle and traditional hot vexed slag bath are similar, comprise structures such as water spray, draining, steam discharge, caping equally, but pond quantity and volume size there are differences.The shallow vexed vexed slag time weak point that is meant, vexed approximately slag was promptly slagged tap in 1 hour to 2 hours.Shallow vexed slag is handled the composition that can stablize solid impurity particle, more be suitable for the building materials utilization, and further lay the foundation for the subsequent recovery scrap iron, and the slag treatment capacity in single pond is bigger in the unit time.Waste residue behind the vexed slag is dug out by excavator 16, carries out magnetic separation through concentration equipment 17 again, and to reclaim iron and steel scrap 18 wherein, remaining waste residue 19 can be done the building material outward transport.In the present embodiment, concentration equipment is the magnetic separation belt.
Producing about 200,000 tons of steel scraps per year with a 100T electric furnace below is example, introduces technical and economic performance of the present invention.
Main designing technique index is following:
(1) total quantity of slag: 200000 tons/year
(2) melting slag utilizes temperature: 2000 ℃
(3) slag is warm eventually:＜50 ℃
(4) saturation steam parameter: process circulation usefulness, a part is outer to be supplied
Pressure: 0.8MPa
Temperature: 175.83 ℃
(5) superheated vapour parameter in the treating column
Pressure: 0.80MPa
Temperature: 350.00 ℃
(6) internal recycle saturation steam amount: 80.25 tons/hour
(7) the broken saturation steam amount of using of vapour: 1.72 tons/hour
(8) the outer saturation steam (0.8MPa) that supplies more than needed: 8.2 tons/hour
(9) reclaim steel scrap: 24000 tons/year
(10) waste residue amount capable of using: 176000 tons/year
By conservative estimation, the economic benefit of its generation is following:
(1) reclaims steel scrap: 1000 yuan/ton=24,000,000 yuan/year of 2.4 ten thousand tons of/year *
(2) recovered steam: 0.01 ten thousand yuan/ton=5,740,000 yuan/year of 7000 hours * of 8.2 tons of/hour *
(3) waste residue utilization: 10 yuan/ton=1,760,000 yuan/year of 17.6 ten thousand tons of/year *
Add up to and reclaim income: 3,150 ten thousand yuan/year.
Claims (6)
1. metallurgical furnace high-temperature molten slag waste heat steel scrap recovery method, it is characterized in that: said method comprises:
(1) vapour is broken: with HP steam high-temperature molten slag is impacted, high-temperature molten slag is smashed and be cooled to thinner solid impurity particle;
(2) waste heat recovery: in treating column, feed steam, carry out heat exchange at steam described in the said treating column and said solid impurity particle, heat exchange produces superheated vapour;
(3) a kind of metallurgical furnace high-temperature molten slag waste heat steel scrap recovery method dedusting and generation steam: said superheated vapour is after bag-type dust is handled; Get into steam generation device, in steam generation device, carry out generating the HP steam of the broken use of the said vapour of confession and the steam that waste heat recovery is used behind the steam-water heat exchanging.
2. a kind of metallurgical furnace high-temperature molten slag waste heat steel scrap recovery method according to claim 1 is characterized in that: in shallow vexed pond, the solid impurity particle after the waste heat recovery processing is carried out handling in shallow vexed slag 1-2 hour.
3. a kind of metallurgical furnace high-temperature molten slag waste heat steel scrap recovery method according to claim 2 is characterized in that: the solid impurity particle after shallow vexed slag is handled is salvaged shallow vexed pond, adopts concentration equipment that the scrap iron in the solid impurity particle is filtered out then.
4. a kind of metallurgical furnace high-temperature molten slag waste heat steel scrap recovery method according to claim 1, it is characterized in that: tilted-putted sieve plate is set in the said treating column, vibrator is installed on the sieve plate, said solid impurity particle carries out heat exchange with steam on sieve plate.
5. a kind of metallurgical furnace high-temperature molten slag waste heat steel scrap recovery method according to claim 1, it is characterized in that: said steam generation device is a steam heater.
6. a kind of metallurgical furnace high-temperature molten slag waste heat steel scrap recovery method according to claim 1 is characterized in that: be provided with high temperature resistant anti-hydrolysis PPS fabric filter element in the said sack cleaner.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105292101A CN102453779A (en) | 2010-11-02 | 2010-11-02 | Method for recycling waste heat and scrap steel of high-temperature melting slag in metallurgical furnace |
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| CN2010105292101A CN102453779A (en) | 2010-11-02 | 2010-11-02 | Method for recycling waste heat and scrap steel of high-temperature melting slag in metallurgical furnace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103571983A (en) * | 2012-07-24 | 2014-02-12 | 上海宝冶钢渣综合开发实业有限公司 | Autoclaving treatment modification technology for converter steel slag and applications thereof |
| CN115052998A (en) * | 2020-02-03 | 2022-09-13 | Sms集团有限公司 | Method for granulating metallurgical residues |
| CN115261546A (en) * | 2021-04-30 | 2022-11-01 | 宝山钢铁股份有限公司 | Method, system, apparatus and medium for determining the most economical scrap ratio in converter steelmaking |
-
2010
- 2010-11-02 CN CN2010105292101A patent/CN102453779A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103571983A (en) * | 2012-07-24 | 2014-02-12 | 上海宝冶钢渣综合开发实业有限公司 | Autoclaving treatment modification technology for converter steel slag and applications thereof |
| CN103571983B (en) * | 2012-07-24 | 2016-06-08 | 上海宝冶钢渣综合开发实业有限公司 | Converter steel slag autoclaving process modified technique and application thereof |
| CN115052998A (en) * | 2020-02-03 | 2022-09-13 | Sms集团有限公司 | Method for granulating metallurgical residues |
| CN115261546A (en) * | 2021-04-30 | 2022-11-01 | 宝山钢铁股份有限公司 | Method, system, apparatus and medium for determining the most economical scrap ratio in converter steelmaking |
| CN115261546B (en) * | 2021-04-30 | 2024-05-14 | 宝山钢铁股份有限公司 | Determination method, system, equipment and medium for most economical scrap ratio in converter steelmaking |
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Application publication date: 20120516 |