CN109423532A - A kind of improved short route molten iron smelting technique - Google Patents
A kind of improved short route molten iron smelting technique Download PDFInfo
- Publication number
- CN109423532A CN109423532A CN201710760337.6A CN201710760337A CN109423532A CN 109423532 A CN109423532 A CN 109423532A CN 201710760337 A CN201710760337 A CN 201710760337A CN 109423532 A CN109423532 A CN 109423532A
- Authority
- CN
- China
- Prior art keywords
- coal
- gas
- molten iron
- coal gas
- vault
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a kind of improved short route molten iron smelting techniques.Directly using Iron Ore Powder and fine coal and part lump coal smelting molten iron, the process for not needing the heavily contaminateds such as sintering, pelletizing and coking, pollution is less, low energy consumption, and traditional blast furnace process smelting molten iron or the supplement as traditional process can be substituted in steel plant.
Description
Technical field
The present invention relates to a kind of new iron-smelting process, which directly uses Iron Ore Powder, does not need coke, using fine coal and
Lump coal smelts liquid molten iron, with short, the environmental-friendly feature of process.
Background technique
Traditional blast furnace ironmaking is the most important ironmaking process in the world today, as shown in Figure 1, the development by over one hundred year is gone through
Journey, it is highly developed.However, there are two main problems for traditional blast furnace ironmaking: first, blast furnace ironmaking to metallurgical coke according to
Rely strongly, coke consumption amount is big, and the in short supply of coking coal resource constrains blast furnace ironmaking production；Second, blast furnace ironmaking must use
Block-like raw material needs mating sintering and pelletizing process, smelts long flow path, environmental pollution is serious, CO2、SO2And NOxDeng harmful gas
Body discharge is more (process pollutant emission accounts for that steel always discharges before iron 90% or more).It is close several in order to solve above-mentioned two problems
Smelt iron worker both at home and abroad over 10 years and successively develop many novel iron-smelting process, more successfully have at present COREX,
FINEX and HIsmelt technique.COREX iron-smelting process because in reduction shaft furnace furnace charge be easy to cohere blocking, need periodically clear
Sky seriously affects the operating rate of COREX technique；And FINEX its fluidized bed is usually because Iron Ore Powder coheres defluidization, it is also desirable to damping down
Processing, operating rate are relatively relatively low；HIsmelt not yet industrialization completely at present, also in experimental stage, molten iron bath
The critical problems such as resistance to material service life, heat conduction efficiency are not yet fully solved.
Summary of the invention
It is an object of that present invention to provide a kind of abbreviated systems of new smelting molten iron.Directly using Iron Ore Powder and fine coal and
Part lump coal smelting molten iron, the process for not needing the heavily contaminateds such as sintering, pelletizing and coking, pollution is less, low energy consumption, in steel plant
Traditional blast furnace process smelting molten iron or the supplement as traditional process can be substituted.
The present invention is achieved by the following technical solutions:
A kind of improved short route molten iron smelting technique comprising following steps:
S1, lump coal is added from the vault of gasification furnace, so that lump coal is formed semicoke, oxygen is blasted from the air port of gasification furnace,
Make the coal-char combustion, releases heat and whole reducing gas；The amount that lump coal is added can be adjusted according to the temperature of molten iron；From vault
The lump coal of addition is gradually completing volatile matter cracking, destructive distillation as semicoke in stock column from top to bottom；
S2, the oxygen blasted from crown area oxygen burner and the whole reducing gas second-time burning, maintain the coal of vault
Temperature degree is 1000 DEG C；Molten point of slag iron of heat and coal gas of high temperature are provided；The oxygen and coal that oxygen burner blasts from crown area
Gas second-time burning maintains the coal gas of vault at 1000 DEG C or so, so that the volatile matter of lump coal cracks completely；
S3, after the coal gas of vault is cooled to 900 DEG C, through overheating cyclone dust removal, become purified gas；
S4, the purified gas is transported into rotary kiln and scrubbing tower respectively, the cooled coal gas in washing column is cleaned and cools down,
Form the cooling coal gas for blending vault coal gas；Cooling coal gas a part pressurization return system before cyclone dust collectors with gasification
1000~1050 DEG C of chimney arch top coal gas of high temperature blends the coal gas as 900 DEG C, and superfluous cooled coal gas is as output coal gas；
S5, Iron Ore Powder and coal dust are delivered in rotary kiln, after 900 DEG C of high temperature reductions, in the absence of air conditions
It is sent into hot press, is pressed into hot wafering；
S6, the hot wafering is sent into gasification furnace together with lump coal, flux, whole, slag is completed in the stock column of gasification furnace
The molten point of carburizing with molten iron of iron.Slag iron after molten point is periodically discharged from iron mouth.
Preferably, the granularity of the lump coal is 20~50mm.
Preferably, in step S4, the temperature of the cooling coal gas is 40~50 DEG C.
Preferably, in step S5, the weight ratio of shown Iron Ore Powder and coal dust is 10:1, and Iron Ore Powder and Pulverized Coal
Degree is no more than 1mm.
The principle of the invention lies in: its molten iron product quality of ironmaking new process of the invention is suitable with blast furnace, but does not need
Iron ore powder sintering agglomeration process, needs not rely on coke, and fuel is fine coal and lump coal.Specific process is as follows: by Iron Ore Powder with
Coal dust is mixed in a certain ratio addition rotary kiln, with the iron ore of certain prereduction degree and physical thermal after rotary kiln prereduction
Powder is sent into cuber in the case where completely cutting off air conditions and carries out hot pressing, obtains hot wafering, and then hot wafering is added by distributing device and is melted
Gasification furnace carries out reduction eventually and molten point of slag iron.Lump coal, flux can be added together with hot wafering from gasification furnace top, and oxygen is from gas
The air port for changing furnace lower part blasts, the coal gas for providing the heat smelted with the coal-char combustion that lump coal is formed and restoring eventually.Crown area
It is provided with oxygen burner, adjusting post-combustion rate, and guarantees the temperature of vault in 1000~1050 DEG C of sections.Vault
Coal gas of high temperature is blent to be cooled to 900 DEG C and become reducing gas with cooled coal gas and enters hot whirlwind and remove before entering hot cyclone dust removal
Dirt, the purified gas after dedusting largely pass through pipeline and are sent to rotary kiln, provide the heat and coal gas of prereduction for rotary kiln；It is another
Cooling scrubber is gone in part, 900 DEG C of coal gas of high temperature is cooled to 40~50 DEG C or so, so as to return system and vault 1000
~1050 DEG C of coal gas of high temperature blends the coal gas as 900 DEG C and then cyclone dust collectors dedusting of reducing phlegm and internal heat；A small amount of remaining cooled coal gas
For superfluous coal gas, go to generate electricity as output coal gas after can mixing with rotary kiln exhaust gas.In addition, the tail gas of rotary kiln is because have certain
Temperature, can be after first waste heat recycling, remaining chemical energy is for generating electricity.
The configuration mode of gasification furnace is similar compared with conventional melting gasification furnace configuration, with conventional two step method melting and reducing
Unlike: the prereduction device with melting gasification furnace collocation is rotary kiln, and the raw material that rotary kiln uses is powder raw material.For
The gas permeability for guaranteeing melting gasification furnace stock column, the Iron Ore Powder after rotary kiln reduction need be sent to gasification after hot pressing is blocking
Furnace carries out the whole reduction of next step and melts to divide.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, coke can not be used, the degree of dependence of new process STRENGTH ON COKE is low, therefore new process does not need coking process, is refining
The insufficient region of coking coal resource has more vitality.
2, fine ore is directly used, the agglomeration processes such as sintering and pelletizing are not needed, it is environmental-friendly, it discharges low.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
The process flow chart of Fig. 1 blast furnace ironmaking in the prior art；
Fig. 2 is process flow chart of the invention；
In figure: 1, rotary kiln；2, heat pressing forming machines；3, cyclone dust collectors；4, oxygen burner；5, air port；6, tapping hole；7,
Scrubber；8, superfluous coal gas；9, flue gas；10, cold coal gas pressurization machine.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
Referring to fig. 2, Iron Ore Powder progress prereduction carries out in rotary kiln 1, and reduction and generation coal gas are in fusion and gasification eventually
Furnace carries out.Melting gasification furnace lower part is provided with tapping hole 6 and air port 5, top crown area is provided with oxygen burner 4.
Iron Ore Powder and coal dust are delivered to the feed inlet of rotary kiln 1 according to the ratio of 10:1, and 900 DEG C of reducing gas then from
The other end of rotary kiln blasts, and the tail gas 9 being discharged from feed inlet goes to generate electricity after mixing after waste heat recycles with superfluous coal gas 8.
Iron Ore Powder after 900 DEG C of high temperature reductions has certain prereduction degree and temperature, in the condition of isolation air
Under be sent to heat pressing forming machines 2 and be pressed into DRI block (hot wafering), DRI block then enters melting gas together with lump coal and flux
Change furnace, DRI further completes reduction eventually in stock column.
Oxygen is blasted from air port 5, the coal-char combustion with high temperature, for the whole reduction of DRI and molten point of slag iron provide heat and
Reducing gas melts the slag iron after dividing and is discharged from iron mouth 6.Oxygen burner 4 is that vault second-time burning improves oxygen at vault, to control
Dome temperature processed is at 1000 DEG C or so, to guarantee that lump coal volatile matter cracks completely and gas composition has enough reduction potentials.Gas
Change coal gas of high temperature that furnace generates and cooling coal gas is blent as going cyclone dust collectors dedusting after 900 DEG C, the purified gas one after dedusting
Rotary kiln is sent to as prereduction coal gas in part, and it is clean cooled coal gas, cooled coal gas that another part, which is sent to the washing cooling of scrubbing tower 7,
Coal gas occurs in arch roof of gasification furnace and vault after most of pressurization by pressuring machine 10 and blends the coal gas as 900 DEG C.Superfluous
Cooled coal gas 8 exports, and mixes and generates electricity with rotary kiln feed inlet coal gas 9.
In conclusion only presently preferred embodiments of the present invention, is not used to limit the scope of implementation of the present invention, it is all according to
Equivalent changes and modifications carried out by shape described in scope of the invention as claimed, construction, feature and spirit should be included in this
In the scope of the claims of invention.
Claims (4)
1. a kind of improved short route molten iron smelting technique, which comprises the steps of:
S1, lump coal is added from the vault of gasification furnace, so that lump coal is formed semicoke, oxygen is blasted from the air port of gasification furnace, makes institute
Coal-char combustion is stated, heat and whole reducing gas are released；
S2, the oxygen blasted from crown area oxygen burner and the whole reducing gas second-time burning, maintain the coal gas temperature of vault
Degree is 1000 DEG C；
S3, after the coal gas of vault is cooled to 900 DEG C, through overheating cyclone dust removal, become purified gas；
S4, the purified gas is transported into rotary kiln and scrubbing tower respectively, the cooled coal gas in washing column is cleaned and cools down, and is formed
For blending the cooling coal gas of vault coal gas；
S5, Iron Ore Powder and coal dust are delivered in rotary kiln, after 900 DEG C of high temperature reductions, are sent into the absence of air conditions
In hot press, it is pressed into hot wafering；
S6, the hot wafering is sent into gasification furnace together with lump coal, flux, is completed in the stock column of gasification furnace whole, slag iron
The molten point of carburizing with molten iron.
2. improved short route molten iron smelting technique as described in claim 1, which is characterized in that the granularity of the lump coal is 20
~50mm.
3. improved short route molten iron smelting technique as described in claim 1, which is characterized in that in step S4, the cooling
The temperature of coal gas is 40~50 DEG C.
4. improved short route molten iron smelting technique as described in claim 1, which is characterized in that in step S5, shown iron ore
The weight ratio of powder and coal dust is 10:1, and Iron Ore Powder and coal powder size are no more than 1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710760337.6A CN109423532A (en) | 2017-08-30 | 2017-08-30 | A kind of improved short route molten iron smelting technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710760337.6A CN109423532A (en) | 2017-08-30 | 2017-08-30 | A kind of improved short route molten iron smelting technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109423532A true CN109423532A (en) | 2019-03-05 |
Family
ID=65501983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710760337.6A Pending CN109423532A (en) | 2017-08-30 | 2017-08-30 | A kind of improved short route molten iron smelting technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109423532A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118345211A (en) * | 2024-05-13 | 2024-07-16 | 山东省冶金设计院股份有限公司 | Iron ore powder reduction device and method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1818082A (en) * | 2006-03-10 | 2006-08-16 | 沈阳东方钢铁有限公司 | Iron and steel gas based smelting and reducing process with iron-ore powder pre-reduced |
| CN101397597A (en) * | 2007-09-26 | 2009-04-01 | 宝山钢铁股份有限公司 | Method for producing spongy iron by direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed |
| CN102031325A (en) * | 2010-11-26 | 2011-04-27 | 中冶赛迪工程技术股份有限公司 | Iron making system and process for producing molten iron by melting gasification |
| CN103290160A (en) * | 2012-02-29 | 2013-09-11 | 宝山钢铁股份有限公司 | Process for producing direct reduced iron (DRI) by carrying out pure oxygen gasification on semicoke |
| CN103589860A (en) * | 2013-11-21 | 2014-02-19 | 广西灏运环保燃料科技有限公司 | Method for burning lean iron ores with rotary kiln |
| CN104212930A (en) * | 2014-09-05 | 2014-12-17 | 钢研集团晟华工程技术有限公司 | BAOSHEREX (Baosteel-Shenghua high efficiency smelting reduction) ironmaking process for smelting molten iron by two-step method |
| CN104789728A (en) * | 2015-04-30 | 2015-07-22 | 中冶南方工程技术有限公司 | Short-process iron smelting method |
| CN106957937A (en) * | 2017-04-20 | 2017-07-18 | 江苏省冶金设计院有限公司 | A kind of method and system of use COREX devices and direct-reduction shaft furnace production sponge iron |
-
2017
- 2017-08-30 CN CN201710760337.6A patent/CN109423532A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1818082A (en) * | 2006-03-10 | 2006-08-16 | 沈阳东方钢铁有限公司 | Iron and steel gas based smelting and reducing process with iron-ore powder pre-reduced |
| CN101397597A (en) * | 2007-09-26 | 2009-04-01 | 宝山钢铁股份有限公司 | Method for producing spongy iron by direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed |
| CN102031325A (en) * | 2010-11-26 | 2011-04-27 | 中冶赛迪工程技术股份有限公司 | Iron making system and process for producing molten iron by melting gasification |
| CN103290160A (en) * | 2012-02-29 | 2013-09-11 | 宝山钢铁股份有限公司 | Process for producing direct reduced iron (DRI) by carrying out pure oxygen gasification on semicoke |
| CN103589860A (en) * | 2013-11-21 | 2014-02-19 | 广西灏运环保燃料科技有限公司 | Method for burning lean iron ores with rotary kiln |
| CN104212930A (en) * | 2014-09-05 | 2014-12-17 | 钢研集团晟华工程技术有限公司 | BAOSHEREX (Baosteel-Shenghua high efficiency smelting reduction) ironmaking process for smelting molten iron by two-step method |
| CN104789728A (en) * | 2015-04-30 | 2015-07-22 | 中冶南方工程技术有限公司 | Short-process iron smelting method |
| CN106957937A (en) * | 2017-04-20 | 2017-07-18 | 江苏省冶金设计院有限公司 | A kind of method and system of use COREX devices and direct-reduction shaft furnace production sponge iron |
Non-Patent Citations (1)
| Title |
|---|
| 朱苗勇等: "《现代冶金工艺学——钢铁冶金卷》", 31 December 2016, 冶金工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118345211A (en) * | 2024-05-13 | 2024-07-16 | 山东省冶金设计院股份有限公司 | Iron ore powder reduction device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103468961B (en) | A kind of airtight cupola furnace process Steel Plant are containing zinc, lead powder dirt processing method | |
| CN104212930B (en) | A kind of BAOSHEREX iron-smelting process of two-step smelting molten iron | |
| CN101386897B (en) | Iron-smelting technology of SDRF furnace | |
| CN106868245B (en) | A kind of molten iron making processes of two-step method | |
| CN100519768C (en) | Shaft furnace for production of ferrochromium and smelting method thereof | |
| CN110438277B (en) | Cyclone flash reduction direct steelmaking system and process | |
| CN101260448B (en) | Fusion reduction iron-smelting method for directly using concentrate powder | |
| CN101624638B (en) | Gas-burning reducing iron-fining furnace and one-step reducing iron-fining method thereof | |
| CN102337369A (en) | High-wind-temperature rotational flow injection disturbance melting reduction and prereduction combination device and method | |
| CN105112663B (en) | A kind of combined producing process of high carbon ferro-chrome and semi-coke | |
| CN102409124A (en) | Continued ironmaking device based on melting reduction | |
| CN1940092A (en) | Fuse reducing iron-smelting process for rotating furnace | |
| CN103451451A (en) | Ferro-nickel alloy production technology with laterite nickel ore processed through oxygen enrichment hot air shaft furnace | |
| CN104894322A (en) | Multilayer slag smelting reduction ironmaking method and apparatus thereof | |
| CN102329909A (en) | Method for extracting iron particles and zinc powder from dust of steel and iron plant | |
| CN106119449B (en) | A kind of blast furnace whole world group smelting process | |
| CN106086281B (en) | A kind of flash ironmaking and the integrated apparatus and method of coal gas | |
| CN112981027A (en) | Direct smelting process device for iron-containing zinc-containing solid waste in iron and steel plant | |
| CN101724727B (en) | Short-flow rotary hearth furnace continuous steelmaking method comprehensively utilizing resources | |
| CN214694260U (en) | Direct smelting process device for iron-containing zinc-containing solid waste in iron and steel plant | |
| CN109536662A (en) | A kind of rotary kiln gas-based reduction-total oxygen bath smelting iron-smelting device | |
| CN103194557A (en) | Novel gas fusing and melting furnace | |
| CN1818082A (en) | Iron and steel gas based smelting and reducing process with iron-ore powder pre-reduced | |
| CN202279831U (en) | High blast temperature swirl injection perturbation smelting reduction and pre-reduction integrated device | |
| CN102127610B (en) | Ironmaking equipment and process for direct smelting reduction of iron ore |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190305 |
|
| RJ01 | Rejection of invention patent application after publication |