CN105779679B - A kind of direct reduction iron making apparatus and method utilized based on blast furnace slag waste heat - Google Patents
A kind of direct reduction iron making apparatus and method utilized based on blast furnace slag waste heat Download PDFInfo
- Publication number
- CN105779679B CN105779679B CN201610325015.4A CN201610325015A CN105779679B CN 105779679 B CN105779679 B CN 105779679B CN 201610325015 A CN201610325015 A CN 201610325015A CN 105779679 B CN105779679 B CN 105779679B
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- China
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- blast furnace
- iron ore
- ore powder
- slag
- waste heat
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- 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 kind of direct reduction iron making apparatus and method utilized based on blast furnace slag waste heat; device includes granulating device and moving bed reduction apparatus; high temperature furnace slag particle is made in liquid blast furnace using described device; and load reducing agent; directly contacted with Iron Ore Powder as heat carrier, direct reduction reactor production direct reduction iron making occurs for Iron Ore Powder.Technical scheme of the present invention is reduced directly thermal source using blast furnace slag waste heat as Iron Ore Powder, by loading the clinker heat carrier of reducing agent and Iron Ore Powder is intergranular directly contacts, realize the high efficient heat exchanging and mass transfer of reduction reaction, both the high efficiente callback for having realized blast furnace slag waste heat utilizes, and realizes DRI low cost, efficient production again.
Description
Technical field
The present invention relates to energy recovery to utilize field, and in particular to a kind of direct-reduction refining utilized based on blast furnace slag waste heat
Iron apparatus and method.
Background technology
The yoke of development, the environmental protection requirement for adapting to increasingly improve, reduction steel are given birth to break away from coking coal resource shortage
Production capacity consumes, the modern steel commercial development non-blast furnace ironmaking technology of the energy, direct-reduction therein based on noncaking coal
Method is ferriferous oxide in non-fusible, not slag making and reduces generation metal iron product in the solid state, is a kind of mode of production of cleaning.
However, due to lacking rational thermal source, the bottleneck for restricting its industrialization large-scale production is made.
Blast furnace slag is the principal by product of steel manufacture process, and heat content is enriched, often produce 1 ton of pig iron want by-product 0.3~
0.6 ton of clinker, slag per ton about contain（1.26~1.88）×106KJ sensible heat.Excess heat contained by clinker is high but it is sampled
It is relatively low, at present, effective recovery and utilization ways are not found also.Temperature possessed by blast furnace slag and heat, meet just straight
The requirement of reduction iron-smelting process is connect, " free " energy is provided for it, effectively solving the high restriction of DRI production cost, its is produced
The problem of industry.
Patent " blast furnace slag waste heat reclaims and direct-reduction Joint Production system and method "（Application number
201510531284.1）A kind of apparatus and method of blast-furnace cement sensible heat recovery with utilizing are disclosed, this method utilizes clinker
Sensible heat carries out the gasification of coal dust, and H will be rich in caused by coal dust gasification2It is passed among reduction shaft furnace and is carried out directly with CO gas
Connect the production of reduced iron.This method is substantially directly to go back ripe slag granulating technology, Coal Gasification Technology and coal gas
Former ironmaking technology is integrated, and the heat of high-temperature slag is cured in coal gas, then is used as ironmaking reducing agent using coal gas, with
Traditional direct reduction processes of Iron ores is compared, and is selected in reducing agent and is not innovated in preparation, and problems be present：
(1) because temperature needed for coal gasification is higher, therefore this method needs to enter granulated slag using secondary cooling system
Row further cooling, in secondary cooling system, grain slag is exchanged heat with air, but slag surface is attached to coal dust gasification
The ash content of residual, influence its heat transfer effect；
(2) reduction shaft furnace pair also Primordial Qi component requirements are strict, and coal gasification product gas composition generally can not meet to require,
Need additionally to increase hydrogenation plant, add equipment investment and operating cost；
(3) reaction unit needed for system is more, and equipment is complicated, and control is difficult, and flow is longer, and clinker needs to carry out
Secondary cooling, sensible heat can be caused to waste more, heat recovery efficiency is not high, power consumption is big.
The content of the invention
In view of the shortcomings of the prior art, the invention provides a kind of direct reduction iron making dress utilized based on blast furnace slag waste heat
Put and method, high temperature furnace slag particle is made in liquid blast furnace, and load reducing agent, directly contacted with Iron Ore Powder as heat carrier
Efficient Mass and heat transfer is realized, makes Iron Ore Powder that reduction reaction production direct reduction iron making occur.The present invention is made using blast furnace slag waste heat
For Iron Ore Powder be reduced directly thermal source, both realized blast furnace slag waste heat high efficiente callback utilize, realize again DRI it is low into
Originally, efficient production.For achieving the above object, the present invention is achieved using following technical proposals：
The present invention provides a kind of direct reduction iron making device utilized based on blast furnace slag waste heat, it is characterised in that：The device
Including granulating device and moving bed reduction apparatus；
The granulating device includes internal layer granulation area and outer layer Iron Ore Powder preheating zone, liquid blast furnace being provided with the top of granulating device
Slag import, internal layer granulation area top are provided with reducing agent sprinkler, and middle part is provided with pelletizing disc, and bottom exports provided with granulated slag；Outside
Layer Iron Ore Powder preheating zone top is provided with Iron Ore Powder import, is connected with screw feeder, and bottom is provided with the outlet of preheating Iron Ore Powder and moved
The preheating Iron Ore Powder import of dynamic bed reduction reaction device is connected；
The moving bed reduction reaction device, top are pre-mix zone, and bottom is reducing zone；Set respectively at the top of the pre-mix zone
There are granulated slag import and reduction offgas outlet；The reducing zone is the structure that 3 ~ 10 " oval spherical " reduction rooms are connected；
Between the granulated slag import of the moving bed reduction reaction device and the granulated slag outlet of granulating device, preheating
Iron Ore Powder exports to be connected between preheating Iron Ore Powder import by rotary pocket feeder；Iron product is reduced with granulated slag by clinker
Discharged with reduced iron product exit.
The direct reduction iron making for using said apparatus utilized based on blast furnace slag waste heat is produced, and is comprised the following steps：
(1) liquid blast furnace discharged by blast furnace is granulated into pelletizer, is sprayed in granulation to slag surface
Reducing agent, after making slag granules area load reducing agent, discharge pelletizer；
(2) slag granules for loading reducing agent enter in moving bed reduction reaction device, as heat carrier and preheating
Iron Ore Powder afterwards uniformly mixes, and reducing agent is in the presence of slag granules heat carrier and reduction reaction, generation occur for ferriferous oxide
It is reduced directly iron product.
Further, slag temperature is 1000 ~ 1200 DEG C after the granulation.
Further, after the granulation clinker size controlling in below 2mm.
Further, the reducing agent is liquid, such as coal tar, domestic waste pyrolysis fuel oil, sludge and stalk
Biomass cracking tar, plastics and tire pyrolysis oil etc..
Further, the reducing agent spray flux is the 60% ~ 100% of clinker quality.
Further, the blast furnace slag and Iron Ore Powder input quality ratio are 1 ~ 2:1.
Compared to traditional direct reduction iron making method and apparatus, the present invention has following advantage：
(1) DRI is reduced as Iron Ore Powder preheating and the thermal source of Direct Reduction using blast furnace slag waste heat
Production cost；
(2) mode of heating directly contacted with Iron Ore Powder powder using the clinker heat carrier of load reducing agent, can be significantly improved
Mass and heat transfer efficiency in reduction process；
(3) the caused accessory substance tar being difficult by is as reduction during can using organic solid waste thermochemical study
Agent, realize the treatment of wastes with processes of wastes against one another；
(4) on apparatus structure, due to reducing the continuous change of room diameter of section, clinker is with Iron Ore Powder particle swarm also
The motion state of former room is constantly accumulated in close phase back and forth to be changed between flowing and discrete motion, and the process, which can be obviously promoted, reacted
Mass and heat transfer in journey；
(5) contain various metals mineral in blast furnace slag, the catalyst that can be degraded as tar, promote tar destruction, generation
More effective reduction components, improve reduction efficiency.
Brief description of the drawings
Fig. 1 is process chart
Fig. 2 is the device of the direct reduction iron making utilized based on blast furnace slag waste heat
Wherein 1 granulating device；2 moving bed reduction apparatus；3 internal layers are granulated area；4 outer layer Iron Ore Powder preheating zones；5 liquid are high
Clinker import；6 reducing agent sprinklers；7 pelletizing discs；8 granulated slags export；9 Iron Ore Powder imports；10 screw feeders；11 is pre-
Hot iron miberal powder exports；12 preheating Iron Ore Powder imports；13 pre-mix zones；14 reducing zones；15 granulated slag imports；16 reduction tail gas go out
Mouthful；17 reduction rooms；18 rotary pocket feeders；19 clinkers and reduced iron product exit.
Embodiment
Embodiment 1：
A kind of direct reduction iron making device utilized based on blast furnace slag waste heat, the device include granulating device 1 and moving bed
Reduction apparatus 2；Granulating device 1 includes internal layer granulation area 3 and outer layer Iron Ore Powder preheating zone 4, and the top of granulating device 3 is provided with liquid height
Clinker import 5, the internal layer granulation top of area 3 are provided with reducing agent sprinkler 6, and middle part is provided with pelletizing disc 7, and bottom goes out provided with granulated slag
Mouth 8；The top of outer layer Iron Ore Powder preheating zone 4 is provided with Iron Ore Powder import 9, is connected with screw feeder 10, bottom is provided with preheating iron ore
Powder outlet 11 is connected 12 with the preheating Iron Ore Powder import of moving bed reduction reaction device 2；
The top of moving bed reduction reaction device 2 is pre-mix zone 13, and bottom is reducing zone 14；The top of pre-mix zone 13 is respectively
Provided with granulated slag import 15 and reduction offgas outlet 16；The reducing zone 14 is that 3 ~ 10 " oval spherical " reduction rooms 17 are connected
The structure connect；
Between the granulated slag import 15 of moving bed reduction reaction device 2 and the granulated slag outlet 8 of granulating device 1,11
It is connected between the outlet of preheating Iron Ore Powder and 12 preheating Iron Ore Powder imports by rotary pocket feeder 18；Reduce iron product and granulation stove
Slag is discharged by clinker and reduced iron product exit 19.
A kind of method of the direct reduction iron making utilized based on blast furnace slag waste heat, is comprised the following steps described in the present embodiment：
(1) by blast furnace discharge liquid blast furnace be granulated into pelletizer, in granulation to slag surface according to
60% spray domestic waste pyrolysis fuel oil of clinker quality, the grain of the area load domestic waste pyrolysis fuel oil of generation
It is 1000 DEG C, below particle diameter 2mm to change slag temperature, discharges pelletizer；
(2) slag granules for loading domestic waste pyrolysis fuel oil enter in moving bed reduction reaction device, make
For heat carrier with the Iron Ore Powder after preheating according to clinker and Iron Ore Powder mass ratio 1:1 uniformly mixing, domestic waste cracking are burnt
Oil is in the presence of slag granules heat carrier and reduction reaction occurs for ferriferous oxide, raw after vibratory sieve separates with slag granules
Into DRI.
The assay method of the DRI product metal rate of (GB/T 24236-2009) defined is used, to direct
Reduction iron product is detected, and is measured degree of metalization and is reached 90.2%, can be as the quality raw materials of electric furnace steel making.
Example 2：
A kind of method of the direct reduction iron making utilized based on blast furnace slag waste heat, is comprised the following steps described in the present embodiment：
(1) it is divided into a diameter of 10mm of multiply slag stream through slag runner by the liquid blast furnace of blast furnace discharge, into pelletizer
It is granulated, 100% spray plastic cracking oil in granulation to slag surface according to clinker quality, the area load of generation
The granulated slag temperature of domestic waste pyrolysis fuel oil is 1200 DEG C, below particle diameter 2mm, discharges pelletizer；
(2) slag granules of loaded plastics cracked oil enter moving bed reduction reaction device in, as heat carrier with
Iron Ore Powder after preheating is according to clinker and Iron Ore Powder mass ratio 2:1 uniformly mixing, plastic cracking oil is in slag granules heat carrier
Effect is lower and reduction reaction occurs for ferriferous oxide, after vibratory sieve separates with slag granules, generates DRI.
The assay method of the DRI product metal rate of (GB/T 24236-2009) defined is used, to direct
Reduction iron product is detected, and is measured degree of metalization and is reached 93.7%, can be as the quality raw materials of electric furnace steel making.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than is limited；Although with reference to foregoing
The present invention is described in detail embodiment, for the person of ordinary skill of the art, still can be to foregoing
Technical scheme described in embodiment is modified, or carries out equivalent substitution to which part technical characteristic；And these are changed
Or replace, the essence of appropriate technical solution is departed from the spirit and scope of claimed technical solution of the invention.
Claims (6)
- A kind of 1. direct reduction iron making method utilized based on blast furnace slag waste heat, it is characterised in that this method uses following device, Including granulating device and moving bed reduction reaction device；The granulating device includes internal layer granulation area and outer layer Iron Ore Powder preheating zone, and being provided with liquid blast furnace at the top of granulating device enters Mouthful, internal layer granulation area top is provided with reducing agent sprinkler, and middle part is provided with pelletizing disc, and bottom exports provided with granulated slag；Outer layer iron Miberal powder preheating zone top is provided with Iron Ore Powder import, is connected with screw feeder, and bottom is provided with the outlet of preheating Iron Ore Powder and moving bed The preheating Iron Ore Powder import of reduction reaction device is connected；The moving bed reduction reaction device, top are pre-mix zone, and bottom is reducing zone；Grain is respectively equipped with the top of the pre-mix zone Change clinker import and reduction offgas outlet；The reducing zone is the structure that 3 ~ 10 " oval spherical " reduction rooms are connected；Between the granulated slag import of the moving bed reduction reaction device and the granulated slag outlet of granulating device, iron ore is preheated Powder exports to be connected between preheating Iron Ore Powder import by rotary pocket feeder；The direct reduction iron making for using said apparatus utilized based on blast furnace slag waste heat is produced, and is comprised the following steps：(1) liquid blast furnace discharged by blast furnace is granulated into pelletizer, is sprayed and is reduced to slag surface in granulation Agent, after making slag granules area load reducing agent, discharge pelletizer；(2) slag granules for loading reducing agent enter in moving bed reduction reaction device, after heat carrier and preheating Iron Ore Powder uniformly mixes, and reducing agent is in the presence of slag granules heat carrier and reduction reaction occurs for ferriferous oxide, and generation is direct Reduce iron product.
- A kind of 2. direct reduction iron making method utilized based on blast furnace slag waste heat according to claim 1, it is characterised in that Slag temperature is 1000 ~ 1200 DEG C after the granulation.
- A kind of 3. direct reduction iron making method utilized based on blast furnace slag waste heat according to claim 1, it is characterised in that Clinker size controlling is in below 2mm after the granulation.
- A kind of 4. direct reduction iron making method utilized based on blast furnace slag waste heat according to claim 1, it is characterised in that The reducing agent is the coal tar of liquid or the domestic waste pyrolysis fuel oil of liquid or the life of the sludge and stalk of liquid Material pyrolysis fuel oil or the plastics and tire pyrolysis of liquid oil.
- A kind of 5. direct reduction iron making method utilized based on blast furnace slag waste heat according to claim 1, it is characterised in that The reducing agent spray flux is the 60% ~ 100% of clinker quality.
- A kind of 6. direct reduction iron making method utilized based on blast furnace slag waste heat according to claim 1, it is characterised in that The blast furnace slag is 1 ~ 2 with Iron Ore Powder input quality ratio:1.
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| CN110241355B (en) * | 2018-03-08 | 2020-09-08 | 盐城市鑫洋电热材料有限公司 | Ferrochromium alloy prepared from chromite |
| CN110241314A (en) * | 2018-03-08 | 2019-09-17 | 盐城市鑫洋电热材料有限公司 | A method of ferrochrome is prepared with chromite |
| CN111961783A (en) * | 2020-07-29 | 2020-11-20 | 辽宁科技大学 | Sponge iron production system and production process |
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| CN101705325A (en) * | 2009-12-10 | 2010-05-12 | 重庆瑞源环境工程有限公司 | Method for producing sponge iron and recycling nonferrous metals simultaneously by utilizing metallurgy waste materials |
| CN102277461A (en) * | 2011-08-17 | 2011-12-14 | 北京科技大学 | Method for directly restoring industrial waste residue through rotary hearth furnace |
| CN102329911A (en) * | 2011-09-13 | 2012-01-25 | 唐山奥特斯科技有限公司 | Process for manufacturing iron pellets from low-grade complex refractory ore through molten slag method |
| CN102363218A (en) * | 2011-11-25 | 2012-02-29 | 北京君致清科技有限公司 | Method for producing copper-powder-containing iron by reducing copper-containing furnace cinders directly |
| CN105087844A (en) * | 2015-08-26 | 2015-11-25 | 中冶南方工程技术有限公司 | Blast furnace slag waste heat recovery and direct reduction joint production system and method |
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- 2016-05-17 CN CN201610325015.4A patent/CN105779679B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705325A (en) * | 2009-12-10 | 2010-05-12 | 重庆瑞源环境工程有限公司 | Method for producing sponge iron and recycling nonferrous metals simultaneously by utilizing metallurgy waste materials |
| CN102277461A (en) * | 2011-08-17 | 2011-12-14 | 北京科技大学 | Method for directly restoring industrial waste residue through rotary hearth furnace |
| CN102329911A (en) * | 2011-09-13 | 2012-01-25 | 唐山奥特斯科技有限公司 | Process for manufacturing iron pellets from low-grade complex refractory ore through molten slag method |
| CN102363218A (en) * | 2011-11-25 | 2012-02-29 | 北京君致清科技有限公司 | Method for producing copper-powder-containing iron by reducing copper-containing furnace cinders directly |
| CN105087844A (en) * | 2015-08-26 | 2015-11-25 | 中冶南方工程技术有限公司 | Blast furnace slag waste heat recovery and direct reduction joint production system and method |
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Effective date of registration: 20181219 Address after: 266011 Xueyuan Hotel, No. 18 Fushun Road, North District, Qingdao City, Shandong Province Patentee after: Guangda Institute of Environmental Technology (Qingdao) Co., Ltd. Address before: 266520 No. 777 Jialingjiang Road, Huangdao District, Qingdao City, Shandong Province Patentee before: Qingdao Technological University |