CN103924023B - A kind of iron-bath molten reduction molten bath method for blowing hydrogen - Google Patents
A kind of iron-bath molten reduction molten bath method for blowing hydrogen Download PDFInfo
- Publication number
- CN103924023B CN103924023B CN201310008393.6A CN201310008393A CN103924023B CN 103924023 B CN103924023 B CN 103924023B CN 201310008393 A CN201310008393 A CN 201310008393A CN 103924023 B CN103924023 B CN 103924023B
- Authority
- CN
- China
- Prior art keywords
- hydrogen
- bath
- molten
- iron
- molten bath
- 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.)
- Active
Links
Landscapes
- Manufacture Of Iron (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of iron-bath molten reduction molten bath method for blowing hydrogen, enter molten bath change employing submerged lance into by original by the single bottom blowing of hydrogen, take hydrogen as the polyphasic flow that the ferriferous oxide of carrier gas and coal dust premix are formed to the molten bath winding-up below spray gun.Hydrogen is permanently connected to the ferriferous oxide in ferric oxide in slag and polyphasic flow in winding-up process, and blowing direction is below molten bath, hydrogen in molten bath through downwards and upwards two kinds of paths, make the duration of contact of hydrogen and ferric oxide and contact area all comparatively bottom blowing increase, thus improve the utilization ratio of hydrogen, decrease the waste of hydrogen.
Description
Technical field
The present invention relates to iron-bath molten reduction technique, more particularly, relate to a kind of iron-bath molten reduction molten bath method for blowing hydrogen.
Background technology
The iron-bath molten reduction method of existing ore fines injection/coal dust in molten bath produces molten iron technology, with HIsmelt technique for representative (as Chinese patent CN98810993.X etc.), use carbon as reductive agent and heat-generating agent, but using carbon as reductive agent and heat-generating agent, there is following shortcoming in it: a large amount of CO2 greenhouse gas emissions, to environment produce very large pollution, and if with hydrogen as reductive agent, then its reduzate is iron and water, can not produce greenhouse gas emission.
1/2F
2O
3+3/2H
2=Fe+3/2H
2OΔH°＝-50.013KJ/molFe（1）
1/2Fe
2O
3+3/2C=Fe+3/2COΔH°＝-246.940KJ/molFe（2）
As shown in above formula, if using carbon as reductive agent, the heat needed for iron of reduction same amount is 5 times with hydrogen for reductive agent institute heat requirement, consumes energy larger.Therefore, if Hydrogen Energy effectively utilizes, good energy-saving effect will be had.In addition, to the main molten bath reduction process maintaining thermo-negative reaction by secondary combustion, if thermal losses reduces, then reaction process is easy to keep at high temperature carrying out, rate of reduction and efficiency higher.
In addition, under melting and reducing condition, rate of reduction 1-2 the order of magnitude faster than carbon of hydrogen.Therefore, if Hydrogen Energy enough effectively utilizes, there is hydrogen to participate in the equipment productive rate of reduction by the productive rate higher than carbon reduction apparatus complete under co-content.
Based on above-mentioned, number of patent application: the Chinese patent of 200910046518.8 discloses a kind of method and device thereof of smelting reduction of ion ores with bottom blowing hydrogen, this method adopts bottom blowing hydrogen mode, make hydrogen pass molten iron and enter slag blanket, carry out the reduction reaction of ferriferous oxide in slag blanket, although this method of hydrotreating has melting bath stirring and hydrogen reduction two kinds of functions concurrently, do not provide the utilization ratio of hydrogen.In addition, the coalescence of single bottom blown gas in uphill process is grown up, and hydrogen not only being made through reducing the contact area with iron protoxide in slag during slag blanket, also being reduced the residence time making bubble hydrogen in slag, causing the utilization ratio of hydrogen to reduce.Be also shown in Publication about Document to the research of hydrogen utilization ratio, i.e. Metallurgija, 2004, No3,155-162, result of study shows, using hydrogen as the problem existing for the iron-bath molten reduction of reductive agent be: the optimum rate of utilization of hydrogen only has 40%-60%, major part hydrogen has neither part nor lot in reaction and just departs from reaction zone and enter furnace gas, causes the waste of hydrogen, increases usage quantity and the use cost of hydrogen.
In addition, as as described in the patent documentation that provides, prior art employing spray gun to also there are following 2 defects when coal injection in molten bath and breeze: carrier gas 1) used is nitrogen, and nitrogen is while convey materials, reductive action can not be played to breeze (or ferriferous oxide), on the contrary, after entering molten bath together in company with breeze (or ferriferous oxide), both the contact of semicoke in breeze (or ferriferous oxide) and coal dust or molten bath had been reduced and taken blocking effect, again diluting effect is played to gas concentration, all unfavorable to the reduction of breeze (or ferriferous oxide), reduce rate of reduction and the efficiency in molten bath.2) in prior art, the conveying of coal dust and breeze is carried out respectively in different pipelines, therefore, the mixing uniformity entered during winding-up between the coal dust in molten bath and breeze is poor, not only reduce the area that coal dust and breeze contact with each other, be unfavorable for the carrying out of ore deposit and coal direct reduction reactor, meanwhile, also make the condition of the water-gas reaction being conducive to breeze reduction reaction be deteriorated, reduce further rate of reduction and the efficiency in molten bath.
Summary of the invention
For the above-mentioned shortcoming existed in prior art, the object of this invention is to provide a kind of iron-bath molten reduction molten bath method for blowing hydrogen, reduction efficiency and the utilization ratio of hydrogen can be improved.
For achieving the above object, the present invention adopts following technical scheme:
This iron-bath molten reduction molten bath method for blowing hydrogen, adopts submerged lance, take hydrogen as the polyphasic flow that the ferriferous oxide of carrier gas and coal dust premix are formed to the molten bath winding-up below spray gun.
Within the scope of the reduction temperature of 1400 DEG C ~ 1600 DEG C, in the described mixture be blown in molten bath, the molar ratio of carbon and hydrogen is 0.4 ~ 1: 0.9 ~ 1.1.
Described winding-up polyphasic flow adopts gas powder liquid jet, and jet number is two or more.
Described submerged lance is arranged symmetrically in end reducing furnace slag gold interface with in the same level of upper furnace wall, and the vertical central axis of its winding-up orientation of its axis end reducing furnace, winding-up axis and horizontal sagging angle are at 25 ~ 60 degree.
Described spray gun number is 2 ~ 10.
The Mach number of the exporting hydrogen of described spray gun winding-up polyphasic flow is greater than 0.05.
Also lime powder is added with in the mixture of described spray gun winding-up.
In described polyphasic flow, the ratio of the total amount of calcium oxide and iron protoxide in polyphasic flow and calcium oxide controls at 11 ~ 16wt%.
In technique scheme, iron-bath molten reduction molten bath of the present invention method for blowing hydrogen, entering molten bath by the single bottom blowing of hydrogen change employing submerged lance into by original, take hydrogen as the polyphasic flow that the ferriferous oxide of carrier gas and coal dust premix are formed to the molten bath winding-up below spray gun.Hydrogen is permanently connected to the ferriferous oxide in ferric oxide in slag and polyphasic flow in winding-up process, and blowing direction is below molten bath, hydrogen in molten bath through downwards and upwards two kinds of paths, make the duration of contact of hydrogen and ferric oxide and contact area all comparatively bottom blowing increase, thus improve the utilization ratio of hydrogen, decrease the waste of hydrogen.
Embodiment
Iron-bath molten reduction molten bath of the present invention method for blowing hydrogen is by original mode being entered molten bath by the single bottom blowing of hydrogen, change employing submerged lance into, take hydrogen as carrier gas, to the polyphasic flow that the molten bath winding-up below spray gun is formed mixed by hydrogen and coal dust or hydrogen, coal dust and ferriferous oxide (breeze).Within the scope of the reduction temperature of 1400 DEG C ~ 1600 DEG C, in the described mixture be blown in molten bath, the molar ratio of carbon and hydrogen is 0.4 ~ 1:0.9 ~ 1.1.Said mixture can adopt the mode of pre-mixing, and described winding-up polyphasic flow adopts gas powder liquid jet, and jet number is two or more.Described submerged lance is arranged symmetrically in end reducing furnace slag gold interface with in the same level of upper furnace wall, and the vertical central axis of its winding-up orientation of its axis end reducing furnace, winding-up axis and horizontal sagging angle are at 25 ~ 60 degree.Described spray gun number is 2 ~ 10.The Mach number of the exporting hydrogen of described spray gun winding-up polyphasic flow is greater than 0.05.Also lime powder is added with in the mixture of described spray gun winding-up.In described polyphasic flow, the ratio of the total amount of calcium oxide and iron protoxide in polyphasic flow and calcium oxide controls at 11 ~ 16wt%.
Adopt method for blowing hydrogen of the present invention, hydrogen is permanently connected to the ferriferous oxide in ferric oxide in slag and polyphasic flow in winding-up process, and blowing direction is below molten bath, hydrogen in molten bath through downwards and upwards two kinds of paths, this make the duration of contact of ferriferous oxide in ferric oxide and polyphasic flow in hydrogen and slag and contact area all comparatively bottom blowing increase.
Moreover, in polyphasic flow coal dust and the abundant premix of breeze condition under, the condition of the more abundant premix of touch opportunity of carbon and powdered iron ore increases greatly, and reacts with hydrogen, carbon reducing iron oxides the water-gas reaction (C+H occurred in moving process in winding-up and molten bath
2o=H
2+ CO) also the abundant premix due to carbon, hydrogen, breeze is strengthened, therefore, both to considerably increase in polyphasic flow the thermodynamics impellent of ferriferous oxide in ferric oxide and polyphasic flow in carbon and hydrogen reduction slag, also substantially improve the dynamic conditions of carbon and hydrogen reduction ferric oxide.
The polyphasic flow adopted is gas powder liquid jet flow pattern, and in order to keep jet flow pattern, the exporting hydrogen Mach number of the submerged lance winding-up polyphasic flow jet of selection is greater than 0.05.Gas powder liquid jet number is two or more.
By adjustment position, angle and injection parameter, jet is intersected in molten bath, consequently: 1, in gas powder liquid jet, hydrogen and solid phase small-particle keep lotus root to close in jet moving process always, add the time of hydrogen reduction ferric oxide.2, the momentum of gas powder liquid jet is larger, in molten bath, intersect collision rift formation reaction particles and bubble are more, considerably increase reaction area, also eliminate the coalescence of molten bath bottom blowing hydrogen in uphill process in prior art to grow up simultaneously, adding contact area and the residence time of hydrogen iron protoxide when passing slag blanket and in slag, causing the utilization ratio of hydrogen to increase.
In addition, the collision of polyphasic flow stock, except considering collision effect (bubble and particle scattering degree), also needs to consider the comfort level to rifle position and angular setting in the impact of motion on its residence time of bubble and particle after collision scattering, the impact on the resistance to material of furnace lining and operation.Comprehensive above-mentioned consideration, more suitable winding-up axis and horizontal sagging angle control at 25 ~ 60 degree.
And adding lime powder, the surface tension of slag around polyphasic flow can be made to reduce, and bubble hydrogen is not easily built up and is grown up.
Below by embodiment contrast, further illustrate effect of the present invention:
Comparative example (prior art, bottom blowing hydrogen, non-premixed)
Embodiment 1(the present invention, colliery premix)
Embodiment 2(the present invention, colliery premix)
In sum, adopt method for blowing hydrogen of the present invention, the utilization ratio of its hydrogen can bring up to more than 85% at 1500 DEG C, and former in about 60% of prior art, effect is fairly obvious.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.
Claims (8)
1. an iron-bath molten reduction molten bath method for blowing hydrogen, is characterized in that:
Adopting submerged lance, take hydrogen as the polyphasic flow that the ferriferous oxide of carrier gas and coal dust premix are formed to the molten bath winding-up below spray gun.
2. iron-bath molten reduction molten bath as claimed in claim 1 method for blowing hydrogen, is characterized in that:
Within the scope of the reduction temperature of 1400 DEG C ~ 1600 DEG C, in the described mixture be blown in molten bath, the molar ratio of carbon and hydrogen is 0.4 ~ 1: 0.9 ~ 1.1.
3. iron-bath molten reduction molten bath as claimed in claim 1 method for blowing hydrogen, is characterized in that:
Described winding-up polyphasic flow adopts gas powder liquid jet, and jet number is two or more.
4. iron-bath molten reduction molten bath as claimed in claim 3 method for blowing hydrogen, is characterized in that:
Described submerged lance is arranged symmetrically in end reducing furnace slag gold interface with in the same level of upper furnace wall, and the vertical central axis of its winding-up orientation of its axis end reducing furnace, winding-up axis and horizontal sagging angle are at 25 ~ 60 degree.
5. iron-bath molten reduction molten bath as claimed in claim 4 method for blowing hydrogen, is characterized in that:
Described spray gun number is 2 ~ 10.
6. the iron-bath molten reduction molten bath method for blowing hydrogen as described in claim 1 or 4 or 5, is characterized in that:
The Mach number of the exporting hydrogen of described spray gun winding-up polyphasic flow is greater than 0.05.
7. iron-bath molten reduction molten bath as claimed in claim 1 method for blowing hydrogen, is characterized in that:
Also lime powder is added with in the mixture of described spray gun winding-up.
8. iron-bath molten reduction molten bath as claimed in claim 7 method for blowing hydrogen, is characterized in that:
In described polyphasic flow, the ratio of the total amount of calcium oxide and iron protoxide in polyphasic flow and calcium oxide controls at 11 ~ 16wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310008393.6A CN103924023B (en) | 2013-01-10 | 2013-01-10 | A kind of iron-bath molten reduction molten bath method for blowing hydrogen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310008393.6A CN103924023B (en) | 2013-01-10 | 2013-01-10 | A kind of iron-bath molten reduction molten bath method for blowing hydrogen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103924023A CN103924023A (en) | 2014-07-16 |
| CN103924023B true CN103924023B (en) | 2016-04-27 |
Family
ID=51142413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310008393.6A Active CN103924023B (en) | 2013-01-10 | 2013-01-10 | A kind of iron-bath molten reduction molten bath method for blowing hydrogen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103924023B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455121A (en) * | 2020-03-18 | 2020-07-28 | 内蒙古赛思普科技有限公司 | Method for producing high-purity cast pig iron by hydrogen-based smelting reduction |
| CN112676321A (en) * | 2021-01-07 | 2021-04-20 | 武汉中科固废资源产业技术研究院有限公司 | Method and system for cooperatively treating waste incineration fly ash in steel mill |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1278869A (en) * | 1997-09-26 | 2001-01-03 | 技术资源有限公司 | Direct smelting process for producing metals from metal oxides |
| CN101519706A (en) * | 2009-02-24 | 2009-09-02 | 上海大学 | Method and device for smelting reduction of ion ores with bottom blowing hydrogen |
| CN102634620A (en) * | 2012-04-28 | 2012-08-15 | 宝山钢铁股份有限公司 | Method for improving utilization rate of carbon-hydrogen reducing agent in iron-bath smelting reduction |
-
2013
- 2013-01-10 CN CN201310008393.6A patent/CN103924023B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1278869A (en) * | 1997-09-26 | 2001-01-03 | 技术资源有限公司 | Direct smelting process for producing metals from metal oxides |
| CN101519706A (en) * | 2009-02-24 | 2009-09-02 | 上海大学 | Method and device for smelting reduction of ion ores with bottom blowing hydrogen |
| CN102634620A (en) * | 2012-04-28 | 2012-08-15 | 宝山钢铁股份有限公司 | Method for improving utilization rate of carbon-hydrogen reducing agent in iron-bath smelting reduction |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103924023A (en) | 2014-07-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101538631B (en) | Process and device for smelting ferronickel and nickel-containing molten iron by using lower-nickel materials | |
| CN101575654B (en) | Process and device for preparing iron alloy containing nickel and nickel-chromium | |
| CN102159731A (en) | Process for producing molten iron | |
| CN106011341B (en) | The method that blast furnace process schreyerite carries high-coal ratio | |
| CN1047704A (en) | Make iron alloy with molten bath reactor | |
| CN101684507B (en) | Direct steel making technique by reducing iron ore with gas | |
| KR20010007250A (en) | A direct smelting process and apparatus | |
| CN106119449B (en) | A kind of blast furnace whole world group smelting process | |
| CN103993116B (en) | Double tower flash iron-smelting furnace and iron smelting method | |
| CN106086281B (en) | A kind of flash ironmaking and the integrated apparatus and method of coal gas | |
| CN102586527A (en) | Novel hydrogen-carbon smelting reduction ironmaking process | |
| CN201351168Y (en) | Iron-contained material continuous steelmaking device | |
| CN103981362B (en) | A kind of sintering removes alkali-metal method | |
| CN103924023B (en) | A kind of iron-bath molten reduction molten bath method for blowing hydrogen | |
| CN101665849A (en) | Continuous steel making process for iron ore | |
| CN102268502B (en) | Spongy iron preparation method by smelting refractory iron ore (slag) with reduction rotary kiln | |
| CN102041400B (en) | Process and equipment for producing high-content manganese silicon alloy from low-grade ferromanganese ore | |
| CN101914648B (en) | Method for producing low-phosphorus molten iron by utilizing oxygen-enriched top blown to carry out melting reduction on high-phosphorus iron ore | |
| CN105112583A (en) | Method for increasing combustion rate of coal powder by adding furnace-front dust of blast furnace to injection coal | |
| CN109468469A (en) | A kind of device and method of composite gas blowing carbon reducing and smelting copper ashes | |
| CN103468935B (en) | Production method of sinter containing high-crystal-water lump ore | |
| CN102586528A (en) | Novel natural gas smelting reduction ironmaking process | |
| CN102925610A (en) | Electricity-coal process melting and reduction ironmaking technology | |
| CN202063976U (en) | Equipment for producing high manganese-silicon by low-grade ferromanganese ore | |
| CA2513814A1 (en) | An improved smelting process for the production of iron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |