CN107058664A - A kind of system and method by direct reduction in shaft furnace - Google Patents
A kind of system and method by direct reduction in shaft furnace Download PDFInfo
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- CN107058664A CN107058664A CN201710380233.2A CN201710380233A CN107058664A CN 107058664 A CN107058664 A CN 107058664A CN 201710380233 A CN201710380233 A CN 201710380233A CN 107058664 A CN107058664 A CN 107058664A
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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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- 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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- 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)
- Separation Of Gases By Adsorption (AREA)
Abstract
The present invention relates to a kind of system by direct reduction in shaft furnace, the system includes device for deoxidizing, shaft furnace, blender, cyclone dust collectors, electric cleaner, nitrogen rejection facility, reformer and heating furnace.The present invention both make use of the coal bed gas resource largely existed to turn avoid its risk of explosion existed, and this technique also effectively reduces CO in system2The problem of discharge, realize that the resource of sponge iron production process, high efficiency of energy are utilized.Simultaneously present invention preserves the moisture in top gas, resource utilization is improved, water scrubber dust collecting process compared with prior art can reduce by more than 95% cooling water usage amount, eliminate cooling water treatment system, shorten technological process, save production cost.
Description
Technical field
The present invention relates to metallurgical technology field, use mixing source of the gas as also Primordial Qi by shaft furnace more particularly, to one kind
The system and method for direct ironmaking.
Background technology
DRI refers to that a kind of iron ore is less than under the conditions of fusion temperature the also ironmaking of original production sponge iron in stove
Production process, its product is mainly used as the raw material of electric furnace steel making, also can as pneumatic steelmaking cooling agent, if through secondary reduction
Also it is available for powder used in metallurgy.Due to being that the DRI that low-temperature reduction is obtained fails abundant carburizing, thus it is carbon containing relatively low, and ore deposit
Gangue content in stone, which can neither melt slag making removing, to be reduced, thus DRI almost remained in iron ore
Whole gangues.
2015, whole world DRI yield was 72,570,000 tons, and wherein gas-based shaft kiln method produces DRI about
Account for 80%.Ripe gas-based shaft kiln directly reduced iron-smelting process is MIDREX techniques and HYL III (Energiron) technique at present.
Also Primordial Qi is made with top gas mixing using natural gas as unstripped gas in MIDREX methods after reformation.Iron ore is in shaft furnace through reduction
Gas is reduced, and obtains DRI, is come out of the stove after the section cooling of shaft furnace bottom coohng.The methods of HYL III are with natural gas and part top gas
For raw material, also Primordial Qi, heated stove are produced by the catalytic reforming reaction of raw natural gas, transforming agent water vapour in reformer
It is heated to after 900~950 DEG C being passed through reduction shaft furnace iron ore.Both techniques are all by being made after reformation by source of the gas of natural gas
The also Primordial Qi required for reduction iron production is taken, this kind of method is more suitable for the abundant and cheap Middle East of gas reserves, north
The areas such as beautiful and Russia.And carry out shaft furnace using natural gas for raw material in the not abundant country of this kind of gas reserves of China
Method production DRI be present.
Gaseous mixture reduced iron is made using device in Gas and natural gas in the prior art, in order that device in Gas deviates blast pole
Limit, the method for use is to be filled with substantial amounts of natural gas, and the concentration of methane in gaseous mixture is greatly improved.But its handling process is long,
Due to the presence of oxygen in gas treating process, or there is the danger exploded.And this technical finesse on condition that
Substantial amounts of natural gas is filled with to device in Gas, this is difficult still large-scale promotion for the area that natural gas is deficient or cost is high.
In addition, processing side of the current gas-based shaft kiln directly reduced production sponge iron process of foreign countries Midrex to shaft furnace top gas
Formula is all water scrubber cooling, dedusting, then carries out dewater treatment by gas-liquid separator.Water scrubber cools dedusting, it is necessary to use
Substantial amounts of cooling water, while needing to maintain many sewage disposals, recycle unit, is recycled sewage, disposed of in its entirety work
Skill complexity and high expensive.There is 400 DEG C or so of temperature after the discharge of shaft furnace top gas, washing cooling is directly carried out to it and is wasted
Top gas institute heat content, does not accomplish making full use of for heat.
Therefore, in order to overcome that natural gas is deficient in the prior art and the technological deficiency such as complex process is, it is necessary to a kind of new
DRI system and method.
The content of the invention
In view of the above-mentioned problems, it is an object of the invention to provide a kind of mixing source of the gas of use deoxidation coal bed gas and top gas work
To go back system and method for the Primordial Qi by direct reduction in shaft furnace.Coal bed gas refers to be mixed into substantial amounts of during extraction under mine
Air, forms the methane of different proportion and the gaseous mixture of air.China's coal bed gas resource rich reserves, and overall utilization at present
It is relatively low.Therefore, Metal In Shaft Furnace sponge iron is carried out using coal bed gas as raw material, source of the gas cost can be both reduced, can utilize again
It is a large amount of to there is coal bed gas resource, the problem of solving deficient China's natural gas or high expensive.
To reach above-mentioned purpose, the present invention is adopted the following technical scheme that：
According to the present invention there is provided a kind of system by direct reduction in shaft furnace, including：
Device for deoxidizing, the device for deoxidizing is used for the deoxidation for carrying out coal bed gas, and there is device for deoxidizing the first import and first to go out
Mouthful, the first import is used to input coal bed gas；
Blender, the blender has the second coal bed gas import, the second top gas import and second outlet, the of blender
Two coal bed gas imports are connected with the first outlet of device for deoxidizing；
Shaft furnace, the shaft furnace has top gas outlet, pelletizing import, products export and also Primordial Qi import；The top gas of shaft furnace
Outlet and the second top gas inlet communication of blender；
Cyclone dust collectors, the cyclone dust collectors have triple feed inlet and the 3rd outlet, the triple feed inlet of cyclone dust collectors with
The second outlet connection of blender；
Electric cleaner, the electric cleaner has the 4th import and the 4th outlet, and the 4th import of electric cleaner is removed with whirlwind
3rd outlet of dirt device；
Pressure-swing absorption apparatus, the pressure-swing absorption apparatus has the 5th import and the 5th outlet, the 5th of pressure-swing absorption apparatus the
Import and the 4th outlet of electric cleaner；
Reformer, the reformer has the 6th import and the 6th outlet, the 6th import of reformer and pressure-swing absorption apparatus
The 5th outlet；And
Heating furnace, the heating furnace has the 7th import and the 7th outlet, the 7th import of heating furnace and the 6th of reformer the
Outlet；
Wherein, the 7th outlet of heating furnace is connected with the also Primordial Qi entrance of shaft furnace.
Further, pressure-swing absorption apparatus is nitrogen removing device.
Further, the adsorbent of pressure-swing absorption apparatus is at least one of zeolite molecular sieve, carbon molecular sieve and activated carbon.
Further, the operating temperature of cyclone dust collectors and electric cleaner is less than 300 DEG C.
Further, the operating temperature of cyclone dust collectors and electric cleaner is 100-300 DEG C
Further, device for deoxidizing uses two tower pressure swing adsorption methods, and capital equipment has two adsorption towers, vavuum pump, bufferings
Tank.Adsorbent uses carbon molecular sieve, and adsorption temp is room temperature, and single column adsorption time is 60-150s, and time swap is 30-60s,
Coal bed gas adsorptive pressure is 0.2-0.4MPa.Coal bed gas after processing can adjust consistent rear direct according to shaft furnace top gas pressure
Mixed with top gas；One pressure-swing absorption process includes absorption, displacement, the step such as pressure, desorption.Two adsorption tower asynchronous operations：
Tower 1 is adsorbed, conversion operation when tower 2 carry out desorption, then press and carry out two tower reverse operatings again.
According to the present invention there is provided a kind of method using system direct ironmaking as above, comprise the following steps：
Step one：Coal bed gas is carried out after deoxidation treatment in feeding blender in device for deoxidizing；
Step 2：In a mixer, coal bed gas and shaft furnace top gas (top gas redundance can be used as fuel gas)
It is mixed into after gaseous mixture, rough dedusting is carried out into cyclone dust collectors, refined dedusting is carried out subsequently into electric cleaner；
Step 3：Denitrogenation is carried out in pressure-swing absorption apparatus to gaseous mixture；
Step 4：Gaseous mixture after denitrogenation in step 3 is passed through reformer quenched into also Primordial Qi；
Step 5：Also Primordial Qi is passed through in shaft furnace after heating stove heat and used as reduction process gas raw material；
Step 6：The acid pellet of iron ore reacts in shaft furnace with also Primordial Qi and obtains sponge iron product.
Further, coal bed gas is the mixed gas of methane and air in step one, and the volume fraction of wherein methane is
20%-60%；
Further, the temperature that coal bed gas is mixed into gaseous mixture with shaft furnace top gas in step 2 is 110 DEG C -300 DEG C.
Further, the composition of the also Primordial Qi in step 4 is (H2+CO)/(H2+CO+H2O+CO2) mol ratio be not less than
0.9。
Further, the catalyst used in reformer is nickel or nickel-base alloy catalyst.
Further, also the temperature of Primordial Qi is more than 800 DEG C after heated stove heat in step 5.
Further, coal bed gas and top gas mixed volume ratio are 0.4-1.4:1.
The coal bed gas of the present invention and the mixing principle of top gas are：
Coal bed gas and the mixed proportion of top gas need to consider CH in coal bed gas after deoxidation4Content and CO in top gas2With
H2Depending on O content, general coal bed gas is with top gas mixed volume ratio：1.4:1~0.4:1.From gas in subsequent technique
Methane reforming reaction can preferably occur for composition proportion angle, while considering top gas and the mixed gas temperature of coal bed gas
Reach that gas temperature also needs to be maintained at more than 110 DEG C after the temperature working range requirement of cleaner, additional mixing, to ensure stove
Vapor will not be condensed in top gas, improve water utilization rate, it is therefore an objective to make the CH in coal bed gas as far as possible4In reformer fully
Reaction generation reproducibility CO and H2；
The main chemical reactions specifically occurred are：CH4+H2O=CO+3H2And CH4+CO2=2CO+2H2。
The beneficial effects of the invention are as follows：
1. the present invention is by coal seam gas disposal, it is possible to achieve after coal bed gas is mixed with the top gas of shaft furnace, be used as shaft furnace
The gas raw material of reduced iron, takes full advantage of China and measures the low coal bed gas resource of big valency.
2. the present invention to coal gas layer by carrying out deoxidation treatment, it is ensured that the security of coal gas layer, and the nitrogen in coal gas layer
By being carried out with top gas after mixing dust removing, denitrogenation processing is carried out again for high nitrogen mixed gas, gaseous mixture is not only reduced
Separating difficulty, and separating step is reduced, while easily meeting nitrogen content requirement of gaseous mixture, technically it is more prone to real
It is existing, and cost is relatively low.
3. the present invention is mixed using the coal bed gas after deoxidation with shaft furnace top gas, the mixing that temperature is 110-300 DEG C is obtained
Gas, remains the moisture in top gas, improves water utilization rate.Carried out by cyclone dust collectors and electric cleaner at dedusting
Reason, makes gaseous mixture reach the CO in the requirement of reformer, gaseous mixture2The methane in reformer feed and coal bed gas is used as with vapor
Reaction, reduces amount of water, and compared with prior art, especially compared with water scrubber dust collecting process, cooling water makes by the present invention
Consumption can reduce more than 95%, and save cold water process, the circulatory system, save technological process and production cost.
Brief description of the drawings
Fig. 1 is the system schematic by direct reduction in shaft furnace according to embodiments of the invention；
Fig. 2 is the process chart by direct reduction in shaft furnace according to embodiments of the invention.
Reference
1 shaft furnace, 2 blenders, 3 cyclone dust collectors, 4 electric cleaners, 5 pressure-swing absorption apparatus, 6 reformers, 7 heating furnaces, 8 take off
Oxygen device.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with the accompanying drawings and embodiment, it is right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
As shown in figure 1, the system that the present invention is used includes shaft furnace 1, blender 2, cyclone dust collectors 3, electric cleaner 4, change
Press adsorbent equipment 5, reformer 6, heating furnace 7 and device for deoxidizing 8；Device for deoxidizing 8 is used for the deoxidation for carrying out coal bed gas, device for deoxidizing
Tool 8 has the first import and first outlet, and the first import is used to input coal bed gas；Blender 2 has the second coal bed gas import, second
Top gas import and second outlet, the second coal bed gas import of blender are connected with the first outlet of device for deoxidizing；Shaft furnace 1 has
Top gas outlet, pelletizing import, products export and also Primordial Qi import；The top gas outlet of shaft furnace and the second top gas of blender
Inlet communication；Cyclone dust collectors 3 have triple feed inlet and the 3rd outlet, the triple feed inlet of cyclone dust collectors and the second of blender
Outlet；Electric cleaner 4 has the 4th import and the 4th outlet, the 4th import of electric cleaner and the 3rd of cyclone dust collectors the
Outlet；Pressure-swing absorption apparatus 5 has the 5th import and the 5th outlet, the 5th import of pressure-swing absorption apparatus and electric cleaner
The 4th outlet；Reformer 6 has the 6th import and the 6th outlet, the 6th import of reformer and pressure-swing absorption apparatus
5th outlet；And heating furnace 7 has the 7th import and the 7th outlet, the 7th import of heating furnace and the 6th of reformer the
Outlet；7th outlet of heating furnace 7 is connected with the also Primordial Qi entrance of shaft furnace 1.Pelletizing enters perpendicular from the pelletizing import of shaft furnace 1
Reduced in stove, the product after reduction is sent out from the products export of shaft furnace 1.
Device for deoxidizing 8 carries out deoxidation to coal bed gas using two tower pressure swing adsorption methods, and capital equipment has two adsorption towers, true
Empty pump, surge tank.Adsorbent uses carbon molecular sieve, and adsorption temp is room temperature, and single column adsorption time is 60-150s, time swap
For 30-60s, coal bed gas adsorptive pressure is 0.2-0.4MPa.Coal bed gas after processing can be adjusted according to shaft furnace top gas pressure
Directly mixed after consistent with top gas；One pressure-swing absorption process includes absorption, displacement, the step such as pressure, desorption.Two adsorption towers
Asynchronous operation：Tower 1 is adsorbed, conversion operation when tower 2 carry out desorption, then press and carry out two tower reverse operatings again.Deoxidation
Device 8 is connected with blender 2.The top gas outlet of shaft furnace 1 is connected with blender 2, and top gas is delivered in blender 2.Rotation
One end of wind deduster 3 is connected with blender 2, and the other end of cyclone dust collectors 3 is connected with electric cleaner 4, pressure-variable adsorption in turn
Device 5, reformer 6 and heating furnace 7.Heating furnace 7 is connected with the also Primordial Qi entrance of shaft furnace 1, and the also Primordial Qi after heating is delivered to
Reduced in shaft furnace 1.Pressure-swing absorption apparatus 5 is nitrogen removing device, and adsorbent can be zeolite molecular sieve, carbon molecular sieve or activity
One kind of carbon.The operating temperature of cyclone dust collectors 3 and electric cleaner 4 is less than 300 DEG C.The nitrogen that pressure-swing absorption apparatus 5 is produced
It is also used as purging or sealing gland gas is used.Catalyst is used to cause CH in reformer 64、CO2With H2O reacts.Catalyst can be with
It is nickel or nickel-base alloy.
Embodiment 1
As illustrated in fig. 1 and 2, the present embodiment carries out reduced iron using system as described above, and uses the coal seam of exploitation
The volume fraction of gas, wherein methane is 45%；Top gas is mainly H2、CO、H2O and CO2Mixed gas, temperature be 400 DEG C,
Wherein volume fraction is used in mixed way for 75% top gas with coal bed gas, and remaining volume fraction is used as combustion for 25% top gas
Material gas is used；
Coal bed gas is subjected to deoxidation treatment in two tower pressure-swing absorption apparatus, adsorbent is carbon molecular sieve；Reaction condition is
25 DEG C of adsorption temp, single column adsorption time 150s, time swap 60s, adsorptive pressure 0.3MPa.Coal bed gas after deoxidation treatment is defeated
Go out pressure for 200KPa, it is identical with shaft furnace top gas pressure；Pressure-swing absorption apparatus removes in coal bed gas more than 95% oxygen.Will
Temperature after deoxidation is 25 DEG C of coal bed gas 1200Nm3/ the h and top gas 1900Nm that temperature is 400 DEG C3/ h is carried out in blender 2
After being sufficiently mixed, mixture temperature is less than 300 DEG C, meets the operating temperature of cyclone dust collectors 3 and electric cleaner 4；
Gaseous mixture is passed through cyclone dust collectors 3 and carries out rough dedusting, then refined dedusting processing, Ran Hou are carried out in electric cleaner 4
Denitrogenation in pressure-swing absorption apparatus 5, the now use of pressure-swing absorption apparatus 5 zeolite molecular sieve is used as adsorbent.Gaseous mixture after denitrogenation
Add the progress reformation of reformer containing nickel-base catalyst 6 quenched, obtain (H2+CO)/(H2+CO+H2O+CO2) for 0.92 also Primordial Qi.
Also Primordial Qi after will be quenched is heated to 800 DEG C in heating furnace 7, in being passed through shaft furnace body from the middle and lower part of shaft furnace 1；Also
The acid pellet reduction of iron ore is turned into sponge iron product by Primordial Qi in shaft furnace 1, test result indicates that sponge iron resultant metal
Rate reaches more than 90%.
Embodiment 2
As illustrated in fig. 1 and 2, the present embodiment carries out reduced iron using system as described above, and uses the coal seam of exploitation
The volume fraction of gas, wherein methane is 20%；Top gas is mainly H2、CO、H2O and CO2Mixed gas, temperature be 430 DEG C,
Wherein volume fraction is used in mixed way for 65% top gas with coal bed gas, and remaining volume fraction is used as combustion for 35% top gas
Material gas is used；
Coal bed gas is subjected to deoxidation treatment in two tower pressure-swing absorption apparatus, adsorbent is carbon molecular sieve；Reaction condition is
15 DEG C of adsorption temp, single column adsorption time 100s, time swap 50s, adsorptive pressure 0.4MPa.Coal bed gas output pressure after processing
Power is 200KPa, identical with the pressure of shaft furnace top gas；Pressure-swing absorption apparatus gets rid of in coal bed gas more than 95% oxygen.Will
Temperature after deoxidation is 15 DEG C of coal bed gas 2000Nm3/ the h and top gas 1800Nm that temperature is 400 DEG C3/ h is carried out in blender 2
After being sufficiently mixed, mixture temperature is, less than 300 DEG C, to meet the operating temperature of cyclone dust collectors 3 and electric cleaner 4；
Gaseous mixture is passed through cyclone dust collectors 3 and carries out rough dedusting, then refined dedusting processing, Ran Hou are carried out in electric cleaner 4
Denitrogenation in pressure-swing absorption apparatus 5, the now use of pressure-swing absorption apparatus 5 carbon molecular sieve is used as adsorbent.Gaseous mixture after denitrogenation adds
Enter the nickeliferous progress of based alloy catalyst reformer 6 reformation quenched, obtain (H2+CO)/(H2+CO+H2O+CO2) be 0.90 reduction
Gas.
Also Primordial Qi after will be quenched is heated to 900 DEG C in heating furnace 7, in being passed through shaft furnace body from the middle and lower part of shaft furnace 1；Also
The acid pellet reduction of iron ore is turned into sponge iron product by Primordial Qi in shaft furnace 1, test result indicates that sponge iron resultant metal
Rate can reach more than 90%.
Embodiment 3
As illustrated in fig. 1 and 2, the present embodiment carries out reduced iron using system as described above, and uses the coal seam of exploitation
The volume fraction of gas, wherein methane is 60%；Top gas is mainly H2、CO、H2O and CO2Mixed gas, temperature be 400 DEG C,
Wherein volume fraction is used in mixed way for 80% top gas with coal bed gas, and remaining volume fraction is used as combustion for 20% top gas
Material gas is used；
Coal bed gas is subjected to deoxidation treatment in two tower pressure-swing absorption apparatus, adsorbent is carbon molecular sieve；Reaction condition is
30 DEG C of adsorption temp, single column adsorption time 60s, time swap 30s adsorb 0.2MPa, and the coal bed gas output pressure after processing is
200Kpa is identical with the pressure of shaft furnace top gas；In coal bed gas more than 95% oxygen is got rid of after pressure-variable adsorption by after deoxidation
Temperature be 30 DEG C of coal bed gas 830Nm3/ the h and top gas 1800Nm that temperature is 400 DEG C3/ h is fully mixed in blender 2
After conjunction, mixture temperature is, less than 300 DEG C, to meet the operating temperature of cyclone dust collectors 3 and electric cleaner 4；
Gaseous mixture is passed through cyclone dust collectors 3 and carries out rough dedusting, then refined dedusting processing, Ran Hou are carried out in electric cleaner 4
Denitrogenation in pressure-swing absorption apparatus 5, the now use of pressure-swing absorption apparatus 5 activated carbon is used as adsorbent.Gaseous mixture after denitrogenation is added
The nickeliferous progress of based alloy catalyst reformer 6 reformation is quenched, obtains (H2+CO)/(H2+CO+H2O+CO2) for 0.92 also Primordial Qi.
Also Primordial Qi after will be quenched is heated to 850 DEG C in heating furnace 7, in being passed through shaft furnace body from the middle and lower part of shaft furnace 1；Also
The acid pellet reduction of iron ore is turned into sponge iron product by Primordial Qi in shaft furnace 1, test result indicates that sponge iron resultant metal
Rate can reach more than 90%.
The acid pellet for the iron ore that this example 1-3 is used can be former by the iron-bearing mineral such as smart iron ore or sefstromite
Material is made.
The present invention proposes to carry out shaft kiln directly reduced production sponge iron, coal bed gas as gas raw material using coal bed gas resource
Oxygen is removed by pressure-swing absorption apparatus and removes the hidden danger that source of the gas explodes, is then mixed by a certain percentage with shaft furnace top gas, institute
Obtain mixture temperature and be less than 300 DEG C, be passed through cyclone dust collectors, electric cleaner dedusting, gaseous mixture progress pressure-variable adsorption takes off after dedusting
Nitrogen processing, then pass to reformer carry out reforming reaction, it is finally heated and be passed through shaft furnace as also Primordial Qi raw material carry out sponge iron
Production.The present invention both make use of the coal bed gas resource largely existed to turn avoid its risk of explosion existed, while at utmost
The moisture in top gas make use of to carry out reforming reaction with carbon dioxide, while gaseous mixture dedusting uses cyclone dust removal and electric precipitation
The use of water can be effectively reduced compared with traditional water scrubber dedusting method realizes sponge on the premise of low consumption of resources
Resource, the high efficiency of energy of iron production process are utilized.
The foregoing is only presently preferred embodiments of the present invention, not for limit the present invention practical range；If do not taken off
From the spirit and scope of the present invention, the present invention is modified or equivalent substitution, all should covered in the claims in the present invention
Among protection domain.
Claims (10)
1. a kind of system by direct reduction in shaft furnace, it is characterised in that including：
Device for deoxidizing, the device for deoxidizing is used for the deoxidation for carrying out coal bed gas, and the device for deoxidizing has the first import and first
Outlet, first import is used to input the coal bed gas；
Blender, the blender has the second coal bed gas import, the second top gas import and second outlet, the blender
The second coal bed gas import is connected with the first outlet of the device for deoxidizing；
Shaft furnace, the shaft furnace has top gas outlet, pelletizing import, products export and also Primordial Qi import；The shaft furnace it is described
Top gas exports the second top gas inlet communication with the blender；
Cyclone dust collectors, the cyclone dust collectors have triple feed inlet and the 3rd outlet, the described 3rd of the cyclone dust collectors the
Import is connected with the second outlet of the blender；
Electric cleaner, the electric cleaner have the 4th import and the 4th outlet, the 4th import of the electric cleaner with
The 3rd outlet of the cyclone dust collectors；
Pressure-swing absorption apparatus, the pressure-swing absorption apparatus has the 5th import and the 5th outlet, the institute of the pressure-swing absorption apparatus
State the 4th outlet of the 5th import and the electric cleaner；
Reformer, the reformer has the 6th import and the 6th outlet, and the 6th import of the reformer becomes with described
Press the 5th outlet of adsorbent equipment；And
Heating furnace, the heating furnace have the 7th import and the 7th outlet, the 7th import of the heating furnace with it is described heavy
The 6th outlet of whole stove；
Wherein, the 7th outlet of the heating furnace is connected with the also Primordial Qi entrance of the shaft furnace.
2. system according to claim 1, it is characterised in that the pressure-swing absorption apparatus is nitrogen removing device.
3. system according to claim 2, it is characterised in that the adsorbent of the pressure-swing absorption apparatus is zeolite molecules
At least one of sieve, carbon molecular sieve and activated carbon.
4. system according to claim 1, it is characterised in that the work temperature of the cyclone dust collectors and the electric cleaner
Spend for less than 300 DEG C.
5. the method for the system direct ironmaking described in a kind of use claim any one of 1-4, it is characterised in that including following step
Suddenly：
Step one：Coal bed gas is carried out after deoxidation treatment in feeding blender in device for deoxidizing；
Step 2：In a mixer, coal bed gas is mixed into after gaseous mixture with shaft furnace top gas, is slightly removed into cyclone dust collectors
Dirt, refined dedusting is carried out subsequently into electric cleaner；
Step 3：Denitrogenation is carried out in pressure-swing absorption apparatus to gaseous mixture；
Step 4：Gaseous mixture after denitrogenation in step 3 is passed through reformer quenched into also Primordial Qi；
Step 5：Also Primordial Qi is passed through in shaft furnace after heating stove heat and used as reduction process gas raw material；
Step 6：The acid pellet of iron ore reacts in shaft furnace with also Primordial Qi and obtains sponge iron product.
6. method according to claim 5, it is characterised in that coal bed gas is the mixing of methane and air in the step one
The volume fraction of gas, wherein methane is 20%-60%.
7. method according to claim 5, it is characterised in that coal bed gas is mixed into shaft furnace top gas in the step 2
The temperature of gaseous mixture is 110 DEG C -300 DEG C.
8. method according to claim 5, it is characterised in that the composition of the also Primordial Qi in the step 4 is (H2+
CO)/(H2+CO+H2O+CO2) mol ratio be not less than 0.9.
9. method according to claim 5, it is characterised in that the catalyst used in the reformer is nickel or Ni-based conjunction
Au catalyst.
10. method according to claim 5, it is characterised in that go back Primordial Qi in the step 5 after heated stove heat
Temperature is more than 800 DEG C.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4130298A1 (en) * | 2021-08-02 | 2023-02-08 | Primetals Technologies Austria GmbH | Gas compression in hydrogen-based direct reduction |
-
2017
- 2017-05-25 CN CN201710380233.2A patent/CN107058664A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4130298A1 (en) * | 2021-08-02 | 2023-02-08 | Primetals Technologies Austria GmbH | Gas compression in hydrogen-based direct reduction |
| WO2023012114A1 (en) * | 2021-08-02 | 2023-02-09 | Primetals Technologies Austria GmbH | Gas compression in hydrogen-based direct reduction |
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