CN106755692A - The system and method that laterite nickel ore pellet is reduced after gas water steam reformation - Google Patents
The system and method that laterite nickel ore pellet is reduced after gas water steam reformation Download PDFInfo
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- CN106755692A CN106755692A CN201710124914.2A CN201710124914A CN106755692A CN 106755692 A CN106755692 A CN 106755692A CN 201710124914 A CN201710124914 A CN 201710124914A CN 106755692 A CN106755692 A CN 106755692A
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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
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
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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
- C21B13/0073—Selection or treatment of the reducing gases
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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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- 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
A kind of system and method the present invention relates to reduce laterite nickel ore pellet after gas water steam reformation.The system includes shaft furnace, carries hydrogen production device, preheating device, heater；There is shaft furnace lateritic nickel ore pelletizing entrance, intensification gaseous mixture entrance, top gas outlet, sponge iron to export；There are top gas entrance, hydrogen outlet, rich CO gas to export to carry hydrogen production device, and top gas entrance is connected with the top gas outlet of shaft furnace；Preheating device has air inlet, mixed gas outlet, and air inlet is connected with the hydrogen outlet for carrying hydrogen production device, for being passed through natural gas, hydrogen, water vapour in preheating device；Heater has gaseous mixture entrance, intensification mixed gas outlet, and gaseous mixture entrance is connected with the mixed gas outlet of preheating device, and intensification mixed gas outlet is connected with the intensification gaseous mixture entrance of shaft furnace.Present invention, avoiding the consumption of the expense and nickel-base catalyst of reburner, also hydrogen content is high in Primordial Qi, and the sponge iron degree of metalization of preparation is high, is capable of achieving the recycling of heat.
Description
Technical field
The present invention relates to metallurgical technology field, and in particular to reduce laterite nickel ore pellet after a kind of gas water steam reformation
System and method.
Background technology
DRI, also known as sponge iron, is a kind of important Dai Tied steel scrap and better than the steelmaking feed of steel scrap, can be dilute
The impurity element components in steel scrap are released, for electric furnace steel making provides essential pure iron material.Development of iron and steel enterprises is directly gone back
Former iron technology, the requirement that the epoch that can better adapt to develop to enterprise to densification, high efficiency, purifying direction.
2014, whole world DRI yield was 74,550,000 tons.Wherein, by accounting for that gas-based shaft kiln method is produced
80%.Typical technique includes MIDREX techniques and HYL III (Energiron) technique.
MIDREX methods, with top gas as transforming agent, obtain high-quality and reduce with natural gas as unstripped gas through reforming reaction
Gas.After top gas is through dedusting of lowering the temperature, wherein 60~70% mix with natural gas according to chemical reaction equivalent after compression, it is preheated
Device is preheated, then by the reformer equipped with Raney nickel.In reformer, the CO in natural gas and top gas2And H2O occurs
Reforming reaction, obtains 850~900 DEG C of also Primordial Qi, during the reduction pneumatic transmission then entered into shaft furnace.The acid pellet or lump ore of iron content
In shaft furnace DRI is obtained through also Primordial Qi reduction.Discharge is perpendicular after DRI is cooled down through the cooling section of shaft furnace bottom
Stove.The cooling gas of cooling section is discharged from shaft furnace, is then washed through water scrubber and after compressor pressure-raising, is sent shaft furnace recycling back to.
But, in the method, reformer involves great expense, and maintenance cost is higher.Also, the sulphur in gas can cause the reformation in reformer
Catalyst poisoning.Therefore, need strictly to control the sulfur content in ore and coal gas in the technique.
The techniques of HYL III are being reformed with natural gas and part top gas as raw material by raw natural gas, transforming agent vapor
Catalytic reforming reaction in stove produces also Primordial Qi.The also Primordial Qi produced by reformer, is filled by heat reclaim unit, washing cooling
Treatment is put, is then mixed through the top gas of washing cooling, desulfurization and decarburization with part.The heated stove heat of gaseous mixture for obtaining is extremely
900~950 DEG C, in then passing to shaft furnace, reduction-oxidation pelletizing or lump ore.But, in the technique, operating pressure is higher, to anti-
Answer the requirement of device higher.Also, the high temperature reduction gas produced by reburner, need to be through cooling de-watering reducing oxidizability, Ran Houzai
Heat temperature raising.Therefore, in technique less rationally, consume energy higher.
The content of the invention
The present invention is intended to provide the system and method that laterite nickel ore pellet is reduced after a kind of gas water steam reformation, can be with
Metallic nickel by the use of lateritic nickel ore reduction generation, effectively using methane, is gone back hydrogen in Primordial Qi and is contained as the catalyst of reforming reaction
Amount is higher, reduces energy consumption of reaction.
The invention provides reducing the system of laterite nickel ore pellet after a kind of gas water steam reformation, including shaft furnace, carry
Hydrogen production device, preheating device, heater.
There is the shaft furnace lateritic nickel ore pelletizing entrance, intensification gaseous mixture entrance, top gas outlet, sponge iron to export.
There are the hydrogen production device that carries top gas entrance, hydrogen outlet, rich CO gas to export.The top gas entrance
It is connected with the top gas outlet of the shaft furnace.
The preheating device has air inlet, mixed gas outlet.The air inlet and the hydrogen outlet for carrying hydrogen production device
Connection, for being passed through natural gas, hydrogen, water vapour in the preheating device.
The heater has gaseous mixture entrance, intensification mixed gas outlet.The gaseous mixture entrance and the pre- hot charging
The mixed gas outlet connection put.The intensification mixed gas outlet is connected with the intensification gaseous mixture entrance of the shaft furnace.
Further, the heater also has rich carbon monoxide gas inlet, exhanst gas outlet.The rich carbon monoxide
Gas access is connected with the rich CO gas outlet for carrying hydrogen production device.
The preheating device also has smoke inlet.The smoke inlet is connected with the exhanst gas outlet of the heater.
Further, said system also includes the cooling and dedusting device, compression set, the decarbonization device that are sequentially connected.It is described
Cooling and dedusting device has top gas entrance, and the top gas entrance is connected with the top gas outlet of the shaft furnace.The decarburization
There is device top gas to export, and the top gas outlet is connected with the top gas entrance for carrying hydrogen production device.
The invention allows for a kind of utilization said system by reducing laterite nickel ore pellet after gas water steam reformation
Method, including step：
Carried described in the top gas feeding that shaft furnace is discharged in hydrogen production device, respectively obtain hydrogen and rich CO gas.
The hydrogen is preheated during the preheating device is sent into after mixing with natural gas, and is mixed with preheated vapor,
Obtain gaseous mixture.
Heated during the gaseous mixture is sent into the heater, obtain intensification gaseous mixture.
By in the intensification gaseous mixture feeding shaft furnace, the lateritic nickel ore pelletizing in the shaft furnace is reduced, obtain sponge
Iron.
Further, the rich CO gas are sent into the heater as fuel gas.
Further, as pre- hot gas in the flue gas feeding preheating device that the fuel gas burning is produced.
After the above-mentioned steam reformation by gas water in the method for reduction laterite nickel ore pellet, CO and H in the top gas2's
The percentage that volume accounts for the top gas cumulative volume is 65%~75%.
Further, the volume of the CO accounts for accounting >=70% of the rich CO gas volume.
In reducing the method for laterite nickel ore pellet after the above-mentioned steam reformation by gas water, the volume of the vapor and institute
The volume ratio for stating natural gas is 0.9~1.2:1.
After the above-mentioned steam reformation by gas water in the method for reduction laterite nickel ore pellet, the temperature of the intensification gaseous mixture
It is 900~1000 DEG C.
In system and method for the invention, the reformation of methane steam is directly carried out in shaft furnace, methane is not used alone
Reforming stove, reduces the consumption of the expense and nickel-base catalyst of reburner.And, it is to avoid the sulphur pair contained in top gas
The harm of catalyst.Therefore, the optional sulfur-bearing acid pellet of the present invention, has widened the scope of iron ore selection.
Hydrogen production device is carried in the present invention, can be to responseless CO and H in top gas2Separated.Wherein, will separate
The rich CO gas for arriving as heater fuel gas.Also, after hydrogen and natural gas mixing reforming, reduction can be improved
The content of hydrogen in gas, promotes the reduction of acid pellet, improves the degree of metalization of the sponge iron for preparing.
The present invention uses the high-temperature flue gas that heater is produced as the pre- hot gas of preheating device, is effectively utilized high temperature cigarette
The heat energy of gas.Preheated low pressure water vapor mixes with natural gas, hydrogen, can be provided for postorder reduction laterite nickel ore pellet process
Oxidant.The present invention provides oxidant by the way of steam humidification, it is possible to decrease the heat needed for reforming reaction, and increases reduction
Hydrogen content in gas.
Brief description of the drawings
Fig. 1 is the system schematic of reduction laterite nickel ore pellet after gas water steam reformation in the embodiment of the present invention.
Fig. 2 is the side that the present invention utilizes the system shown in Fig. 1 by reduction laterite nickel ore pellet after gas water steam reformation
Method schematic flow sheet.
Reference in accompanying drawing is as follows：
1st, shaft furnace；2nd, cooling and dedusting device；3rd, compression set；4th, decarbonization device；5th, hydrogen production device is carried；6th, preheating device；7、
Heater.
Specific embodiment
Below in conjunction with drawings and Examples, specific embodiment of the invention is described in more details, so as to energy
Enough more fully understand the solution of the present invention and the advantage of its various aspects.However, specific embodiments described below and reality
It is only descriptive purpose to apply example, rather than limitation of the present invention.
The system that laterite nickel ore pellet is reduced after the gas water steam reformation provided by Fig. 1, the present invention includes：Shaft furnace 1,
Carry hydrogen production device 5, preheating device 6, heater 7.
Shaft furnace 1 has lateritic nickel ore pelletizing entrance, intensification gaseous mixture entrance, top gas outlet, sponge iron outlet.
Hydrogen production device 5 is carried with top gas entrance, hydrogen outlet, rich CO gas outlet.Top gas entrance and shaft furnace 1
Top gas outlet connection.
Preheating device 6 has air inlet, smoke inlet, mixed gas outlet.Air inlet connects with the hydrogen outlet for carrying hydrogen production device 5
Connect.The air inlet of preheating device 6 is used for being passed through natural gas, hydrogen, water vapour in preheating device 6, and is preheated.
Heater 7 has gaseous mixture entrance, rich carbon monoxide gas inlet, intensification mixed gas outlet, exhanst gas outlet.Should
Gaseous mixture entrance is connected with the mixed gas outlet of preheating device 6.Intensification mixed gas outlet connects with the intensification gaseous mixture entrance of shaft furnace 1
Connect.Rich carbon monoxide gas inlet is exported with the rich CO gas for carrying hydrogen production device 5 and is connected.Exhanst gas outlet and preheating device 6
Smoke inlet connection.
In different embodiments of the invention, the system also include be sequentially connected cooling and dedusting device 2, compression set 3,
Decarbonization device 4.Wherein, cooling and dedusting device 2 has top gas entrance, and the top gas entrance connects with the top gas outlet of shaft furnace 1
Connect.Decarbonization device 4 is exported with top gas, and top gas outlet is connected with the top gas entrance for carrying hydrogen production device 5.In the system according to
The cooling and dedusting device 2 of secondary connection, compression set 3, decarbonization device 4, for lowering the temperature successively to the top gas that shaft furnace 1 is discharged
Dedusting, compression, carbonization treatment.Three kinds of devices are applied to different Production requirements, or for top gas of different nature.
The invention allows for the system shown in a kind of utilization Fig. 1, by reducing lateritic nickel ore after gas water steam reformation
The method of pelletizing.Fig. 2 is the schematic flow sheet of the method, is comprised the following steps：
(1) the top gas feeding discharged shaft furnace 1 is carried in hydrogen production device 5, respectively obtains hydrogen and rich CO gas.This
In the top gas of invention, CO and H2Volume account for top gas cumulative volume percentage be 65%~75%.Wherein, rich carbon monoxide
The volume of gas accounts for accounting >=70% of top gas volume.Also, in rich CO gas, CO gases account for rich carbon monoxide gas
Accounting >=70% of body cumulative volume.
In different embodiments of the invention, before top gas feeding is carried into hydrogen production device, step is may also include：First by stove
Top gas is sequentially sent in cooling and dedusting device 2, compression set 3, decarbonization device 4, carries out cooling dedusting, compression, carbonization treatment, with
It is met the top gas for carrying the feed needs of hydrogen production device 5.
(2) after the hydrogen that above-mentioned steps are obtained mixes with natural gas, sent into via the air inlet of preheating device 6, water vapour
Also via air inlet feeding preheating device 6 in, obtain gaseous mixture.Wherein, the main component in natural gas is methane.The gaseous mixture
In, the volume of vapor is 0.9~1.2 with the volume ratio of natural gas:1.Then, heated in gaseous mixture being sent into heater 7,
Obtain intensification gaseous mixture.
In the present invention, the temperature of preheated gaseous mixture is 200~300 DEG C.After gaseous mixture is heated, the intensification for obtaining is mixed
The temperature for closing gas is 900~1000 DEG C.
(3) will heat up gaseous mixture feeding shaft furnace 1 in.Lateritic nickel ore pelletizing is via the lateritic nickel ore pelletizing set on shaft furnace 1
Entrance is sent into.In lateritic nickel ore pelletizing of the invention, the mass content of nickel is 0.8~1.5%.The operating pressure of shaft furnace is 0.1
~0.2MPa.
In shaft furnace 1, after lateritic nickel ore pelletizing is reduced, metallic iron and metallic nickel are obtained, can be used as in intensification gaseous mixture
The catalyst of methane and steam reforming reaction.After methane and steam reformation, CO and H is generated2.CO and H2As also Primordial Qi,
During rising in shaft furnace 1, further with lateritic nickel ore pelletizing haptoreaction, by the reduction of lateritic nickel ore pelletizing, sponge is prepared
Iron, and obtain the top gas.
In the present invention, will carry obtained in hydrogen production device 5 rich CO gas feeding heater 7 in, as fuel gas.
Also, the flue gas for producing fuel gas burning in heater 7, as pre- hot gas in feeding preheating device 6, realizes heat
Recycle.
Embodiment 1
Natural gas is sent into preheater after mixing with the hydrogen for proposing hydrogen production device discharge, and the temperature of natural gas and hydrogen is by 40 DEG C
200 DEG C are risen to, and is mixed with preheated water vapour, obtain gaseous mixture.Gaseous mixture is heated to 950 DEG C in heating furnace, obtains
Intensification gaseous mixture.In intensification gaseous mixture feeding shaft furnace, reformation obtains also Primordial Qi, and reduction nickel content is 0.9% (mass content)
Lateritic nickel ore pelletizing, obtains sponge iron and top gas.Wherein, the degree of metalization of sponge iron is 96%.
After top gas is through lower the temperature dedusting, compression, decarburization, feeding is carried in hydrogen production device.Sponge iron after cooling, by shaft furnace bottom
Discharge, after cooling gas discharge shaft furnace, sends circulating cooling in shaft furnace back to and uses again after washing, compression.
Embodiment 2
Natural gas is sent into preheater after mixing with the hydrogen for proposing hydrogen production device discharge, and the temperature of natural gas and hydrogen is by 40 DEG C
200 DEG C are risen to, and is mixed with preheated water vapour, obtain gaseous mixture.Gaseous mixture is heated to 1000 DEG C in heating furnace, obtains
Intensification gaseous mixture.In intensification gaseous mixture feeding shaft furnace, reformation obtains also Primordial Qi, and reduction nickel content is 1.2% (mass content)
Lateritic nickel ore pelletizing, obtains sponge iron and top gas.Wherein, the degree of metalization of sponge iron is 96%.
After top gas is through lower the temperature dedusting, compression, decarburization, feeding is carried in hydrogen production device.Sponge iron directly carries out work without cooling
Industry application.
Embodiment 3
Natural gas is sent into preheater after mixing with the hydrogen for proposing hydrogen production device discharge, and the temperature of natural gas and hydrogen is by 60 DEG C
300 DEG C are risen to, and is mixed with preheated water vapour, obtain gaseous mixture.Gaseous mixture is heated to 900 DEG C in heating furnace, obtains
Intensification gaseous mixture.In intensification gaseous mixture feeding shaft furnace, reformation obtains also Primordial Qi, and reduction nickel content is 1.1% (mass content)
Lateritic nickel ore pelletizing, obtains sponge iron and top gas.Wherein, the degree of metalization of sponge iron is 96%.
After top gas is through lower the temperature dedusting, compression, decarburization, feeding is carried in hydrogen production device.Sponge iron after cooling, by shaft furnace bottom
Discharge, after cooling gas discharge shaft furnace, sends circulating cooling in shaft furnace back to and uses again after washing, compression.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and simultaneously
The non-restriction to implementation method.For those of ordinary skill in the field, can also do on the basis of the above description
Go out the change or variation of other multi-forms.There is no need and unable to be exhaustive to all of implementation method.And thus drawn
Obvious change that Shen goes out or among changing still in protection scope of the present invention.
Claims (10)
1. the system that laterite nickel ore pellet is reduced after a kind of gas water steam reformation, it is characterised in that the system includes perpendicular
Stove, carry hydrogen production device, preheating device, heater；
There is the shaft furnace lateritic nickel ore pelletizing entrance, intensification gaseous mixture entrance, top gas outlet, sponge iron to export；
There are the hydrogen production device that carries top gas entrance, hydrogen outlet, rich CO gas to export；The top gas entrance and institute
State the top gas outlet connection of shaft furnace；
The preheating device has air inlet, mixed gas outlet；The air inlet is connected with the hydrogen outlet for carrying hydrogen production device,
For to being passed through natural gas, hydrogen, water vapour in the preheating device；
The heater has gaseous mixture entrance, intensification mixed gas outlet；The gaseous mixture entrance and the preheating device
Mixed gas outlet is connected；The intensification mixed gas outlet is connected with the intensification gaseous mixture entrance of the shaft furnace.
2. system according to claim 1, it is characterised in that
The heater also has rich carbon monoxide gas inlet, exhanst gas outlet, the rich carbon monoxide gas inlet and institute
State the rich CO gas outlet connection for carrying hydrogen production device；
The preheating device also has smoke inlet, and the smoke inlet is connected with the exhanst gas outlet of the heater.
3. system according to claim 1, it is characterised in that also cooling and dedusting device, compression dress including being sequentially connected
Put, decarbonization device, the cooling and dedusting device has top gas entrance, and the top gas entrance goes out with the top gas of the shaft furnace
There is mouth connection, the decarbonization device top gas to export, and the top gas outlet and the top gas entrance for carrying hydrogen production device connect
Connect.
4. described systems of one of a kind of utilization claim 1-3, by reducing laterite nickel ore pellet after gas water steam reformation
Method, it is characterised in that methods described include step：
Carried described in the top gas feeding that shaft furnace is discharged in hydrogen production device, respectively obtain hydrogen and rich CO gas；
The hydrogen is preheated during the preheating device is sent into after mixing with natural gas, and is mixed with preheated vapor, is obtained
Gaseous mixture；
Heated during the gaseous mixture is sent into the heater, obtain intensification gaseous mixture；
By in the intensification gaseous mixture feeding shaft furnace, the lateritic nickel ore pelletizing in the shaft furnace is reduced, obtain sponge iron.
5. method according to claim 4, it is characterised in that the rich CO gas are sent into the heater
It is middle as fuel gas.
6. method according to claim 5, it is characterised in that the flue gas that the fuel gas burning is produced sends into the preheating
As pre- hot gas in device.
7. method according to claim 4, it is characterised in that CO and H in the top gas2Volume account for the top gas
The percentage of cumulative volume is 65%~75%.
8. method according to claim 7, it is characterised in that the volume of the CO accounts for the rich CO gas volume
Accounting >=70%.
9. method according to claim 4, it is characterised in that the volume ratio of the volume of the vapor and the natural gas
It is 0.9~1.2:1.
10. method according to claim 4, it is characterised in that the temperature of the intensification gaseous mixture is 900~1000 DEG C.
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| CN201710124914.2A CN106755692A (en) | 2017-03-03 | 2017-03-03 | The system and method that laterite nickel ore pellet is reduced after gas water steam reformation |
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| CN201710124914.2A CN106755692A (en) | 2017-03-03 | 2017-03-03 | The system and method that laterite nickel ore pellet is reduced after gas water steam reformation |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268504A (en) * | 2011-08-19 | 2011-12-07 | 中冶赛迪工程技术股份有限公司 | Direct reduction process for producing sponge iron by using coke oven gas |
| CN103667573A (en) * | 2013-12-13 | 2014-03-26 | 王少立 | Short-flow process for producing direct reduction iron with assistance of coke oven gas |
| CN104087701A (en) * | 2014-07-18 | 2014-10-08 | 北京神雾环境能源科技集团股份有限公司 | Method and system for preparing sponge iron by using gas-based shaft furnace |
| US20160017445A1 (en) * | 2014-07-15 | 2016-01-21 | Midrex Technologies, Inc. | Methods and systems for producing direct reduced iron and steel mill fuel gas using coke oven gas and basic oxygen furnace gas |
| CN206607251U (en) * | 2017-03-03 | 2017-11-03 | 江苏省冶金设计院有限公司 | The system that laterite nickel ore pellet is reduced after gas water steam reformation |
-
2017
- 2017-03-03 CN CN201710124914.2A patent/CN106755692A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268504A (en) * | 2011-08-19 | 2011-12-07 | 中冶赛迪工程技术股份有限公司 | Direct reduction process for producing sponge iron by using coke oven gas |
| CN103667573A (en) * | 2013-12-13 | 2014-03-26 | 王少立 | Short-flow process for producing direct reduction iron with assistance of coke oven gas |
| US20160017445A1 (en) * | 2014-07-15 | 2016-01-21 | Midrex Technologies, Inc. | Methods and systems for producing direct reduced iron and steel mill fuel gas using coke oven gas and basic oxygen furnace gas |
| CN104087701A (en) * | 2014-07-18 | 2014-10-08 | 北京神雾环境能源科技集团股份有限公司 | Method and system for preparing sponge iron by using gas-based shaft furnace |
| CN206607251U (en) * | 2017-03-03 | 2017-11-03 | 江苏省冶金设计院有限公司 | The system that laterite nickel ore pellet is reduced after gas water steam reformation |
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