CN103014225A - Consistent-flow velocity heat pipe type waste heat waste steel waste slag recovering method of high-temperature melted slag in converter - Google Patents
Consistent-flow velocity heat pipe type waste heat waste steel waste slag recovering method of high-temperature melted slag in converter Download PDFInfo
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- CN103014225A CN103014225A CN2011102895120A CN201110289512A CN103014225A CN 103014225 A CN103014225 A CN 103014225A CN 2011102895120 A CN2011102895120 A CN 2011102895120A CN 201110289512 A CN201110289512 A CN 201110289512A CN 103014225 A CN103014225 A CN 103014225A
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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
Abstract
The invention provides a consistent-flow velocity heat pipe type waste heat waste steel waste slag recovering method of high-temperature melted slag in a converter. The method comprises the following steps of: (1) carrying out steam crushing, namely impacting high-temperature melted slag by use of high-pressure steam, crushing the high-temperature melted slag, and cooling into thinner slag particles; and (2) recovering the waste heat and generating the steam, namely charging cold air into a processing tower, carrying out heat exchange between the cold air and the slag particles in the processing tower, and enabling hot air generated by the heat exchange to wash a consistent-flow velocity heat pipe, wherein one part of the consistent-flow velocity heat pipe is arranged in the processing tower, the other part of the consistent-flow velocity heat pipe is arranged in a heat pipe type heat exchanger, and the water in the heat pipe type heat exchanger is heated by the hot air so as to be used for the high-pressure steam in the step of steam crushing. After the high pressure steam-resistant and high temperature-resistant liquid melted slag is adopted by the method, the oxygenation efficiency of the waste steel can be reduced, and a good basis for recovering the waste steel which is as much as possible can be laid; and the heat exchange between the slag particles and the cold air can be carried out to recover the waste heat, the heat of the heat air generated by the heat exchange is exchanged by the heat pipe to generate the steam, the steam is further internally circulated for the steam crushing, the cyclic utilization of the sensible heat of the high-temperature melted slag can be realized, and the method is high in recovery efficiency of the waste heat.
Description
Technical field
The present invention relates to high-temperature molten slag recovery technology field, relate in particular to a kind of converter high-temperature molten slag uniform flow heat pipe-type waste heat steel scrap waste residue 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 the recycling of steel industry converter slag.
Background technology
The temperature of the high-temperature molten slag of steel industry generally reaches 1700 ℃, 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 for as the raw material of producing cement paving the way, and this shows, is containing a large amount of sensible heats, iron and steel scrap and residue resource in the high-temperature molten slag.Produce take a 150t converter that approximately 300,000 tons of slags are as example per year, the sensible heat heat that it contains is 450,000,000,000 KJ (kilojoule) approximately, can produce approximately 7.35 ten thousand tons of steam every year; Iron and steel scrap content can reach 13% in the slag, if all reclaim then 3.9 ten thousand tons of annual recyclable steel scraps; Approximately more than 26.1 ten thousand tons, if can improve its value added, interests are also very considerable for the annual production of its waste residue.
Usually adopt traditionally water-flushing-slag apparatus to come high-temperature molten slag is processed, be that high-temperature molten slag enters detritus pool first after the high pressure water shrend, be provided as production cement or the raw material of paving the way use after afterwards the grain slag in the detritus pool being salvaged out dehydration, and first then being sent into by the pump pressurization after filtration of the water in the detritus pool cooled off in the cooling tower, be used for again afterwards high-temperature molten slag is carried out shrend, can realize that like this water circuit uses.Water loss must be replenished by new water.There are a lot of problems in this water-flushing-slag apparatus, and wherein maximum problem is that water consumption is too many, secondly is that the flush slag process has been wasted amount of heat, and surrounding environment is also brought pollution.
All drawbacks in view of traditional flush slag technique; people have proposed dry granulation and energy recovery technology thereof in recent years; its technical scheme is: high-temperature molten slag carries out first heat exchange in pelletizer; and then carry out heat through vibrating bed and reclaim for the second time; at last carry out for the third time recovery of heat in fluidized-bed, 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 adopting the mechanical force of mechanism that high-temperature molten slag is smashed; mechanism need to be provided; and usually can not be directly used in the energy of the recovery of high-temperature molten slag sensible heat and to drive this mechanism; so that whole apparatus structure is 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, usually only reclaim wherein a kind of in sensible heat, steel scrap and the waste residue.Reclaim the melting slag sensible heat and usually adopt the dry granulation technology, reclaim steel scrap and usually adopt hot vexed slag technique, improve the waste residue added value and usually adopt wind crush method.The recyclable steel scrap 11% 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.Particle diameter and the materialization composition of wind crush method waste residue product are controlled, can be used as cement raw material and use.Although 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 at present technical difficulty.
Summary of the invention
The present invention mainly solves in existing dry granulation and the heat recuperation technology thereof and adopts mechanism high-temperature molten slag to be smashed, can not fully be reclaimed and utilize the technical problem of the sensible heat of high-temperature molten slag, proposes a kind of high temperature liquid slag recovery method that the sensible heat of high-temperature molten slag is reclaimed and recycles.
In order to solve its technical problem, the invention provides a kind of converter high-temperature molten slag uniform flow heat pipe-type waste heat steel scrap waste residue recovery method, the method comprises:
(1) vapour is broken: with high pressure steam high-temperature molten slag is impacted, high-temperature molten slag is smashed and is cooled to thinner solid impurity particle;
(2) waste heat recovery and generating steam: in treating column, pass into freezing air, carry out heat exchange at freezing air described in the described treating column and described solid impurity particle, solid impurity particle after the heat exchange is discharged described treating column, the warm air that heat exchange produces washes away the uniform flow heat pipe, the part of described uniform flow heat pipe is in described treating column, another part is in described hot tube heat exchanger, and described warm air is heated to be the water in the hot tube heat exchanger for the rapid high pressure steam of described vapour quick short steps.
Vapour quick short steps of the present invention adopt high pressure steam to impact the liquid molten slag of high temperature 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; The waste heat recovery process mainly is the heat exchange between solid impurity particle and the freezing air, the warm air that heat exchange generates through the uniform flow heat pipe heat exchanging to produce steam, steam again internal recycle is broken for vapour, realized the recycle of high-temperature molten slag sensible heat, adopt this high efficient heat exchanging element of uniform flow heat pipe, improved waste heat recovery efficient.
Further, converter high-temperature molten slag uniform flow heat pipe-type waste heat steel scrap waste residue recovery method of the present invention also comprises: in shallow vexed pond the solid impurity particle of discharging treating column is carried out 20 minutes to 45 minutes shallow vexed slags and process.Shallow vexed slag is processed 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, converter high-temperature molten slag uniform flow heat pipe-type waste heat steel scrap waste residue recovery method of the present invention also comprises: the solid impurity particle after first shallow vexed slag being processed is salvaged shallow vexed pond, then adopts concentration equipment that the steel scrap in the solid impurity particle is filtered out.About 13% 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, the present invention mainly by broken, the waste heat recovery of vapour and generating steam, shallow vexed and magnetic separation process implementation thoroughly reclaim contained sensible heat, steel scrap and the residue resource of high-temperature molten slag comprehensively.
Description of drawings
Fig. 1 is for realizing the process flow sheet of converter high-temperature molten slag uniform flow heat pipe-type waste heat steel scrap waste residue recovery method of the present invention.
Among the figure, 1. deslagging tank, 2. chute, 3. nozzle, 4. treating column, 5. vibrator, 6. sieve plate, 7. gas blower, 8. baffle plate, 9. uniform flow heat pipe, 10. belt, 11. hot tube heat exchanger, 12. steam heaters, 13. steam collectors, 14. deoxygenators, 15. service pump, 16. softening water tanks, 17. shallow vexed ponds, 18. excavators, 19. magnetic separation sieve plates, 20. steel scrap, 21. waste residues, 22. sack cleaners, 23. induced draft fans, 24. aiutage, 25. slag inlets, 26. slag notches, 27. cool air inlets.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
Converter high-temperature molten slag uniform flow heat pipe-type waste heat steel scrap waste residue recovery method of the present invention mainly comprises vapour broken and waste heat recovery and generating steam step.Referring to Fig. 1; the vapour quick short steps are specially suddenly: high-temperature molten slag enters the treating column 4 through deslagging tank 1 and chute 2 successively from slag-drip opening; treating column 4 arranges nozzle 3 in the ingress that high-temperature molten slag enters treating column 4; impact high-temperature molten slag from nozzle 3 high pressure steam out, high-temperature molten slag stream is smashed be granulated into thinner solid impurity particle.High pressure steam is preferably saturation steam, and pressure is between 0.85MPa～1.6MPa.When the pressure of high pressure steam was 0.85MPa, the broken effect of vapour was relatively good, so the pressure of high pressure steam is preferably 0.85MPa.The vapour quick short steps adopt high pressure steam to impact the liquid molten slag of high temperature suddenly, make it broken and are cooled to than fine solid particles, have reduced the oxidation ratio of steel scrap, for follow-up recovery steel scrap as much as possible is 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 is scattered on the sieve plate 6, and solid impurity particle is transferred out treating column 4 under the oscillating action of vibrator 5.In order to make follow-up shallow vexed slag step obtain preferably treatment effect, the solid impurity particle temperature of discharging treating column 4 is controlled between 450 ℃～650 ℃.
Waste heat recovery and generating steam step are specially: the freezing air that is provided by gas blower 7 enters treating column 4 from the below of sieve plate 6, carry out heat exchange with the solid impurity particle that is transferring out treating column 4 on the sieve plate 6, freezing air becomes warm air after the heat exchange, and warm air washes away uniform flow heat pipe 9 first after being arranged on baffle plate 8 rough dustings in the treating column 4.The part of uniform flow heat pipe 9 is arranged in the treating column 4, another part is in hot tube heat exchanger 11, the decoration form of uniform flow heat pipe 9 can be fork row or in-line arrangement, heat transfer effect by uniform flow heat pipe 9, warm air in the treating column 4 is heated to be steam with the water in the hot tube heat exchanger 11, this steam gathers to a certain degree, becomes high pressure steam.Hot tube heat exchanger 11 can produce the saturation steam that pressure is 0.85MPa～1.6MPa.After flue gas through producing after 9 heat exchange of uniform flow heat pipe is discharged treating column 4, entering high temperature resistant resistant to hydrolysis carbon fiber filter core sack cleaner 22 purifies, high temperature resistant resistant to hydrolysis carbon fiber filter core in the fly-ash separator, generally can bear the long term operation temperature about 180 ℃, high energy bears 200 ℃ high temperature, and has the resistant to hydrolysis function, therefore can the direct purification ash-laden gas, dust concentration after the purification is down to less than 3mg/Nm3 and is become clean flue gas, is discharged by aiutage 24 by induced draft fan 23 again.Out high pressure steam is through behind the steam heater 12 from hot tube heat exchanger 11, enters steam collector 13 and gathers together therein.Steam collector 13 connects nozzle 3 by pipeline, wherein high pressure steam is distributed sub-fraction be circulated to nozzle 3 and be used for the vapour granulation, the outer confession of can having more than needed of all the other most of steam.The present invention adopts supplementary unit to provide feedwater for hot tube heat exchanger 11, this supplementary unit comprises softening water tank 16, service pump 15 and the deoxygenator 14 that connects successively, deoxygenator 14 connects hot tube heat exchanger 11, supplementary unit is used to hot tube heat exchanger 11 that high-quality feedwater is provided, to be used for production of steam.Waste heat recovery process of the present invention mainly is the heat exchange between solid impurity particle and the freezing air, the warm air that heat exchange generates through the uniform flow heat pipe heat exchanging to produce steam, steam again internal recycle is broken for vapour, realized the recycle of high-temperature molten slag sensible heat, adopt this high efficient heat exchanging element of uniform flow heat pipe, improved waste heat recovery efficient.
Sieve plate 6 solid impurity particle vapour is broken and that carry out after the heat exchange transfers out treating column 4, and belt 10 is transported to solid impurity particle in the shallow vexed pond 17 subsequently, in shallow vexed pond 17 solid impurity particle is carried out shallow vexed slag and processes.The structure in shallow vexed pond 17 and principle and traditional hot vexed slag bath are similar, comprise equally the structures such as water spray, draining, steam discharge, caping, but pond quantity and volume size there are differences.Shallowly vexedly refer to that the vexed slag time is short, approximately vexed slag was namely slagged tap in 20 minutes to 45 minutes.Shallow vexed slag is processed 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 steel scrap, and the slag treatment capacity in single pond is larger in the unit time.Waste residue behind the vexed slag is dug out by excavator 18, carries out magnetic separation through magnetic separation sieve plate 19 again, and to reclaim steel scrap 20 wherein, remaining waste residue 21 can be done the building material outward transport.
The below produces approximately 300,000 tons of slags per year take a 150t converter and introduces technical and economic performance of the present invention as example.
Main designing technique index is as follows:
(1) total quantity of slag: 300000 ton/years
(2) melting slag utilizes temperature: 1700 ℃
(3) slag final temperature:＜45 ℃
(4) saturation steam parameter: process circulation usefulness, a part is outer to be supplied
Pressure: 0.85MPa
Temperature: 173 ℃
(5) superheated vapour parameter in the treating column
Pressure: 0.85MPa
Temperature: 360 ℃
(6) internal recycle saturation steam amount: 109.86 tons/hour
(7) the broken saturation steam amount of using of vapour: 2.22 tons/hour
(8) more than needed outer for saturation steam (0.85MPa): 10.5 tons/hour
(9) reclaim steel scrap: 39000 ton/years
(10) can utilize the waste residue amount: 261000 ton/years
By conservative estimation, the economic benefit of its generation is as follows:
(1) reclaims steel scrap: 1000 yuan/tons=3,900 ten thousand yuan/year of 3.9 ten thousand ton/years of *
(2) recovered steam: 0.01 ten thousand yuan/ton=7,350,000 yuan/year of 7000 hours * of 10.5 tons of/hour *
(3) waste residue utilization: 10 yuan/tons=2,610,000 yuan/year of 26.1 ten thousand ton/years of *
Add up to and reclaim income: 4,896 ten thousand yuan/year.
Claims (7)
1. converter high-temperature molten slag uniform flow heat pipe-type waste heat steel scrap waste residue recovery method, it is characterized in that: described method comprises:
(1) vapour is broken: with high pressure steam high-temperature molten slag is impacted, high-temperature molten slag is smashed and is cooled to thinner solid impurity particle;
(2) waste heat recovery and generating steam: in treating column, pass into freezing air, carry out heat exchange at freezing air described in the described treating column and described solid impurity particle, solid impurity particle after the heat exchange is discharged described treating column, the warm air that heat exchange produces washes away the uniform flow heat pipe, the part of described uniform flow heat pipe is in described treating column, another part is in described hot tube heat exchanger, and described warm air is heated to be the water in the hot tube heat exchanger for the rapid high pressure steam of described vapour quick short steps.
2. converter high-temperature molten slag uniform flow heat pipe-type waste heat steel scrap waste residue 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 20～45 minutes shallow vexed slags and process.
3. converter high-temperature molten slag uniform flow heat pipe-type waste heat steel scrap waste residue recovery method according to claim 2 is characterized in that: first the solid impurity particle after the shallow vexed slag processing is salvaged shallow vexed pond, then adopt the magnetic separation sieve plate that the steel scrap in the solid impurity particle is filtered out.
4. converter high-temperature molten slag uniform flow heat pipe-type waste heat steel scrap waste residue recovery method according to claim 1 is characterized in that: tilted-putted sieve plate is set in the described treating column, vibrator is installed on the sieve plate.
5. converter high-temperature molten slag uniform flow heat pipe-type waste heat steel scrap waste residue recovery method according to claim 1, it is characterized in that: steam heater connects described hot tube heat exchanger and steam collector, and being used for the rapid described high pressure steam of described vapour quick short steps is directly provided by described steam collector.
6. converter high-temperature molten slag uniform flow heat pipe-type waste heat steel scrap waste residue recovery method according to claim 1, it is characterized in that: described supplementary unit provides feedwater for hot tube heat exchanger, described supplementary unit comprises softening water tank, service pump and the deoxygenator that connects successively, and described deoxygenator connects described hot tube heat exchanger.
7. converter high-temperature molten slag uniform flow heat pipe-type waste heat steel scrap waste residue recovery method according to claim 1 is characterized in that: be provided with high temperature resistant resistant to hydrolysis carbon fiber filter core in the described sack cleaner.
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| CN2011102895120A CN103014225A (en) | 2011-09-22 | 2011-09-22 | Consistent-flow velocity heat pipe type waste heat waste steel waste slag recovering method of high-temperature melted slag in converter |
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| CN2011102895120A CN103014225A (en) | 2011-09-22 | 2011-09-22 | Consistent-flow velocity heat pipe type waste heat waste steel waste slag recovering method of high-temperature melted slag in converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026222A (en) * | 2018-08-03 | 2018-12-18 | 航天金洲（北京）能源科技有限公司 | A kind of scum steam heat crushing device and technique |
| 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 |
-
2011
- 2011-09-22 CN CN2011102895120A patent/CN103014225A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026222A (en) * | 2018-08-03 | 2018-12-18 | 航天金洲（北京）能源科技有限公司 | A kind of scum steam heat crushing device and technique |
| CN109026222B (en) * | 2018-08-03 | 2024-04-19 | 中冶节能环保有限责任公司 | Iron slag steam thermal crushing device and process |
| 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: 20130403 |