CN107881280A - It is a kind of to reduce and cool down the system and method for metallized pellet - Google Patents
It is a kind of to reduce and cool down the system and method for metallized pellet Download PDFInfo
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- CN107881280A CN107881280A CN201711417399.3A CN201711417399A CN107881280A CN 107881280 A CN107881280 A CN 107881280A CN 201711417399 A CN201711417399 A CN 201711417399A CN 107881280 A CN107881280 A CN 107881280A
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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
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
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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
- C21B13/0086—Conditioning, transformation of reduced iron ores
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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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Abstract
The present invention relates to a kind of system of gas-based shaft kiln reduction, the system includes gas-based shaft kiln, cooling gas supply system and goes back Primordial Qi supply system, main component is made as methane and the cooling gas of water in water vapour and desulphurised natural gas by cooling gas supply system, and cooling gas is delivered into gas-based shaft kiln；Also Primordial Qi supply system will obtain the also Primordial Qi using carbon monoxide and hydrogen as main component after the cooled exhaust gas processing after gas-based shaft kiln use, and also Primordial Qi is delivered into gas-based shaft kiln.The invention further relates to a kind of method for reducing and cooling down metallized pellet.Reforming reaction generation CO and H occurs under the catalytic action of thermal state metal pellet (can be iron pellet) for methane and vapor in the cooling gas of the present invention2, the endothermic heat of reaction effect is notable, and metallized pellet significantly shortens in the residence time of the cooling section of gas-based shaft kiln, and the dosage for cooling down gas also substantially reduces, and is advantageous to the densification of shaft furnace body and the raising of production efficiency.
Description
Technical field
The present invention relates to reduction metallurgical technology field, reduced more particularly, to one kind using gas-based shaft kiln and cool down gold
Belong to the system and method for pellet.
Background technology
Compared with traditional blast furnace ironmaking, gas-based shaft kiln (hereinafter referred to as shaft furnace) ironmaking is not required to coking and sintering, pollutant
Discharge substantially reduces, and energy consumption is significantly low.The degree of metalization of shaft furnace sponge iron can reach more than 92%, and impurity content is low, with conjunction
The steel scrap collocation of suitable ratio (70% or so) carries out electric furnace mini-mill steelmaking, harmful element can be effectively diluted, so shaft furnace is extra large
Continuous iron product is the quality raw materials of electric furnace mini-mill steelmaking.
The metallized pellet temperature of reduction shaft furnace section output reaches 800 DEG C or so, is very easy to that secondary oxidation occurs, it is necessary to
Cooled down under reproducibility or inert atmosphere, otherwise can have a strong impact on the quality of sponge iron product.In addition, gas-based shaft kiln cooling section is cold
But the raising of efficiency is also beneficial to the high efficiency and densification of shaft furnace body.So cooling side of shaft furnace thermal state metal pellet
The whether reasonable product quality for efficiently directly influencing shaft furnace sponge iron of method and production efficiency are, it is necessary to cause enough attention.
The CO+H of the cooling gas of existing Midrex shaft furnaces cooling gas2Reach more than 40%, but N2Content is up to 45%,
So can only be recycled as cooling gas and cannot function as also Primordial Qi supply shaft furnace, the chemical energy for cooling down gas can not be fully sharp
With, in addition, Midrx shaft furnaces cooling gas dosage it is also larger, reach 1000Nm3/ t, the burden for cooling down the gas circulatory system are also heavier.
Existing HYL-III gas-based shaft kilns ironmaking technology is using the stock gas after decarburization dehydration with addition of natural gas conduct
The cooling gas of thermal state metal pellet.But related art scheme does not all provide the definite content of natural gas in cooling gas clearly
Scope.Using the stock gas of water removal removing carbon dioxide with addition of cooling gas of the natural gas as metallized pellet, CH4Contact red-hot
Metallized pellet can be decomposed into solid carbon and hydrogen.As pelletizing temperature is reduced to 600~700 DEG C of scopes, CO is also easily sent out
Raw disproportionated reaction, generates solid carbon and CO2.Therefore, the carbon content that product is easily caused using the cooling gas of this composition is fluctuated.
In view of this situation, the invention provides a kind of more rational thermal state metal pellet cooling system and method.
The content of the invention
In view of the above-mentioned problems, the invention provides a kind of system for using gas-based shaft kiln to reduce and cooling down metallized pellet with
And more rational thermal state metal pellet cooling means.
To reach above-mentioned purpose, the present invention adopts the following technical scheme that：
According to the present invention, there is provided a kind of system for reducing and cooling down metallized pellet, include gas-based shaft kiln, cooling gas supply
System and also Primordial Qi supply system,
Gas-based shaft kiln includes body of heater, the cooling section that the body of heater includes the reduction section of top setting and bottom is set；Reduction section
It is disposed adjacent with the cooling section；The bottom of cooling section is provided with cooling gas entrance, and cooling section top exports provided with cooled exhaust gas；Also
It is provided with top gas at the top of former section to export, reduction section bottom is provided with first and goes back Primordial Qi entrance.
Cool down gas supply system and include storage tank in steam inlet, desulphurised natural gas entrance, the first pressue device and first；Steam
Vapour entrance and desulphurised natural gas entrance are respectively equipped with flowmeter；Stop valve is provided with desulphurised natural gas entrance；Steam inlet and
Desulphurised natural gas entrance is connected with the first pressue device；First pressue device is connected with storage tank in first, storage tank and gas in first
The cooling gas entrance of base shaft furnace is connected by being provided with flowmeter with the pipeline of stop valve.
Further, reduction section bottom is additionally provided with the second also Primordial Qi entrance, the second also Primordial Qi entrance and is used for and the first reduction
Gas entrance is passed through also Primordial Qi simultaneously.
Further, also Primordial Qi supply system includes：
Cooled exhaust gas reforming system, furnace roof gas processing system and whole processing system, cooled exhaust gas reforming system and top gas
Processing system accesses whole processing system after being mixed by pipeline,
The gas vent of whole processing system is communicated to the first also Primordial Qi entrance and second and goes back Primordial Qi entrance；
The air inlet connection cooled exhaust gas outlet of cooled exhaust gas reforming system, the air inlet connection stove of furnace roof gas processing system
Top gas exports.
Further, cooled exhaust gas reforming system includes desulphurised natural gas entrance and be sequentially communicated along gas path first
Storage tank, reforming system in purifier, the second pressue device, second, and desulphurised natural gas entrance is net by pipeline access first
Makeup is put between the second pressue device；
Furnace roof gas processing system includes the second purifier, and the air inlet connection top gas of the second purifier exports, the
Whole processing system is accessed in the gas outlet of two purifiers after being mixed with the gas outlet of reforming system by pipeline.
Further, whole processing system includes being sequentially communicated the 3rd pressue device, storage tank and heater in the 3rd, the
The air inlet connection cooled exhaust gas reforming system and furnace roof gas processing system of storage tank in three；The also Primordial Qi of heater connection first enters
Mouth and second goes back Primordial Qi entrance.
According to the present invention, also provide it is a kind of using system reducing as above and the method that cools down metallized pellet, including with
Lower step：
1) main component is made as the cooling gas of methane and water in water vapour and desulphurised natural gas and is passed through gas-based shaft kiln
Cooling section；
2) will obtain after cooling air cooling metallized pellet mixing with desulphurised natural gas after cooled exhaust gas purification, pressure reforming
After obtain reforming gas, obtain also Primordial Qi after reforming the purification of gas and top gas, heating；
3) reducting pellet is treated in the reduction section of gas-based shaft kiln using also Primordial Qi to be reduced to obtain metallized pellet, and
Metallized pellet is cooled down using gas is cooled down；
4) also Primordial Qi obtains top gas after reducing pelletizing to be restored, and top gas continues to participate in step 2).
Further, the main component for cooling down gas is methane and vapor, and its volume fraction is：Methane 80~95%, water
Steam 5~20%.
Further, cool down the cooled exhaust gas composition after air cooling is comprising carbon monoxide, hydrogen gas and water and methane, temperature
200~300 DEG C.Without inert gas N2, can also be obtained as the unstripped gas of gas renormalizing stove, the chemical energy of cooled exhaust gas
Make full use of.
Further, the temperature for cooling down gas is 50~70 DEG C, and pressure is 0.1~0.2MPa；Metallized pellet is carried out cold
Cooling gas flow when but is 500~700Nm3/t。
Further, the pressure of also Primordial Qi is 0.1~0.5MPa, and temperature is 800-900 DEG C.
Further, the iron overwhelming majority in metallized pellet exists with metal Iron activiation.
The beneficial effects of the invention are as follows：
The present invention cooling gas in methane and vapor thermal state metal pellet (can be iron pellet) catalysis
Effect is lower to occur reforming reaction generation CO and H2, the endothermic heat of reaction effect is notable, cooling section of the metallized pellet in gas-based shaft kiln
Residence time significantly shorten, the dosage for cooling down gas also substantially reduces, and is advantageous to the densification and production efficiency of shaft furnace body
Improve.
The addition of vapor can effectively suppress methane decomposition analysis carbon and CO disproportionation analysis carbon reaction in cooling gas, so as to
Enough carburizings for effectively mitigating iron, advantageously reduce the carbon content of final sponge iron product.
The cooled exhaust gas main component of the cooling section discharge of gas-based shaft kiln is CH4, simultaneously containing a small amount of H2O, CO and H2, no
Containing nitrogen, can be fully utilized as the unstripped gas of gas renormalizing stove, chemical energy therein.
Brief description of the drawings
Fig. 1 is the reduction according to embodiments of the invention and cools down the schematic diagram of the system of metallized pellet；
Fig. 2 is the reduction according to embodiments of the invention and cools down the method flow diagram of metallized pellet.
Reference
Storage tank, 16 in 11 steam boilers, 12 steam inlets, 13 desulphurised natural gas entrances, 14 first pressue devices, 15 first
Natural gas tank, 17 desulfurizers, 21 cooling gas entrances, 22 cooling sections, the outlet of 23 cooled exhaust gas, 24 reduction sections, 25 first reduction
Gas entrance, the outlet of 26 top gases, 27 second also Primordial Qi entrance, 31 first purifiers, 32 desulphurised natural gas entrances, 33 second add
Storage tank, 35 reformers, 36 cooling devices, 37 the 3rd purifiers, 38 second purifiers, 39 the 3rd in pressure device, 34 second
Storage tank, 311 heaters, 312 natural gas tanks, 313 desulfurizers in pressue device, 310 the 3rd.
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, there is provided a kind of system for reducing and cooling down metallized pellet, include gas-based shaft kiln, cooling gas supply
System and also Primordial Qi supply system,
Main component is made as methane and the cooling gas of water in water vapour and desulphurised natural gas by cooling gas supply system, and will
Cooling gas is delivered to gas-based shaft kiln；The addition of vapor can effectively suppress methane decomposition analysis carbon and CO disproportionation analysis in cooling gas
Carbon reacts.
Also the cooled exhaust gas after gas-based shaft kiln use and desulphurised natural gas are reformed and reformation gas are made by Primordial Qi supply system, weight
Whole gas obtains the also Primordial Qi using carbon monoxide and hydrogen as main component after being mixed with top gas caused by gas-based shaft kiln, and will be also
Primordial Qi is delivered to gas-based shaft kiln；
Material is carried out reduction reaction by gas-based shaft kiln using the also Primordial Qi of also Primordial Qi supply system conveying, and is utilized and cooled down gas
The cooling gas of supply system conveying cools down to the material after reduction.
Gas-based shaft kiln includes：
Body of heater, the body of heater include top and set reduction section 24 and bottom to set cooling section 22；Reduction section 24 and cooling section 22
It is disposed adjacent；The bottom of cooling section 22 is provided with cooling gas entrance 21, and the top of cooling section 22 is provided with cooled exhaust gas outlet 23；Reduction section
24 tops are provided with top gas outlet 26, and the bottom of reduction section 24 is provided with first and goes back Primordial Qi entrance 25.Reduction section bottom is additionally provided with second
Also Primordial Qi entrance 27, the second also Primordial Qi entrance 27 are used to be passed through also Primordial Qi simultaneously with the first also Primordial Qi entrance 25
Gas supply system is cooled down to include in steam inlet 12, desulphurised natural gas entrance 13, the first pressue device 14 and first
Storage tank 15；Steam inlet 12 and desulphurised natural gas entrance 13 are respectively equipped with flowmeter；Use is provided with desulphurised natural gas entrance 13
In the stop valve for starting or stopping natural gas transportation；Steam inlet 12 and desulphurised natural gas entrance 13 and the phase of the first pressue device 14
Even；First pressue device 14 is connected with storage tank in first 15, and the cooling gas entrance 21 of storage tank 15 and gas-based shaft kiln passes through in first
Flowmeter is provided with the pipeline of stop valve to be connected.
Wherein, steam inlet 12 is used to be passed through vapor, and vapor is produced by external steam boiler 11.Desulphurised natural gas enters
Mouth 13 is used to be passed through the natural gas after desulfurization；Natural gas exports from natural gas tank 16, after producing desulfurization after desulfurizer 17
Natural gas.
Also Primordial Qi supply system includes：
Cooled exhaust gas reforming system, furnace roof gas processing system and whole processing system, cooled exhaust gas reforming system and top gas
Processing system accesses whole processing system after being mixed by pipeline,
The gas vent of whole processing system is communicated to the first also Primordial Qi entrance 25 and second and goes back Primordial Qi entrance 27：
First also Primordial Qi entrance 25 and second goes back the pipeline that Primordial Qi entrance 27 is the gas vent for accessing whole processing system
Two branches, this is a kind of air supply method, can so promote furnace reduction qi leel cloth more uniform and stable.First goes back Primordial Qi entrance
25 and second also Primordial Qi entrance 27 supply start to reduce.When gas-based shaft kiln starts production progress pelletizing reduction, first add into stove
Enter pelletizing, then pass to inert gas and the material in shaft furnace pipeline and stove is heated to predetermined temperature, then pass to predetermined temperature
Start to reduce with the also Primordial Qi of flow, while material is continuously discharged by discharging opening, green-ball is continuously added into from furnace roof.So work as pipeline
After being preheating to assigned temperature with body of heater, cooling gas and also Primordial Qi are opened simultaneously, and cooling gas is straight behind cooled exhaust gas outlet 23 out
Tap into cooled exhaust gas reforming system, be reformation gas by desulphurised natural gas and steam reforming, then gas will be reformed as also Primordial Qi
The first also also Primordial Qi entrance 27 of Primordial Qi entrance 25 and second is passed through to be reduced.Again by metallized pellet in cooling section through supercooling
Gas is cooled down, and cooled exhaust gas proceeds by the series of steps such as above-mentioned reformation into also Primordial Qi supply system and produced newly afterwards
Also Primordial Qi.
The air inlet connection cooled exhaust gas outlet 23 of cooled exhaust gas reforming system, the air inlet connection of furnace roof gas processing system
Top gas outlet 26.
The first purification that cooled exhaust gas reforming system includes desulphurised natural gas entrance 32 and is sequentially communicated along gas path fills
Storage tank 34, reforming system in the 31, second pressue device 33, second are put, and desulphurised natural gas entrance 32 accesses first by pipeline
Between the pressue device 33 of purifier 31 and second；Desulphurised natural gas entrance 32 is used to be passed through the natural gas after desulfurization；Natural gas
Exported from natural gas tank 312, the natural gas after desulfurization is produced after desulfurizer 313.Storage tank 34 is cold for storing in second
But the mixed gas of tail gas and desulphurised natural gas.
Reforming system includes reformer 35, the purifier of cooling device 36 and the 3rd being sequentially communicated along gas path
37.Reformer 35 is used to the gas progress reforming reaction for entering reformer 35 is obtained reforming gas, and cooling device 36 is to the reformation
Gas is cooled down and removes the CO reformed in gas by the 3rd purifier 372And H2O。
Furnace roof gas processing system includes the second purifier 38, the air inlet connection top gas outlet of the second purifier 38
26, for purifying top gas, remove carbon dioxide and vapor in top gas；The gas outlet of second purifier 38 and reformation
Whole processing system is accessed in the gas outlet of system after being mixed by pipeline.
Whole processing system includes storage tank 310 and heater 311 in the 3rd pressue device the 39, the 3rd that is sequentially communicated, the
The air inlet connection cooled exhaust gas reforming system and furnace roof gas processing system of storage tank 310 in three；The connection of heater 311 first is also
The also Primordial Qi entrance 27 of Primordial Qi entrance 25 and second.Storage tank 310 is used to store by top gas and reforms what gas mixed in 3rd
Also Primordial Qi；Also Primordial Qi first carries out being pressurized to 0.1-0.5MPa before storage tank 310 in entrance the 3rd in the 3rd pressue device 39.
As shown in Figure 1-2, a kind of system reducing using as above and the method for cooling down metallized pellet be also provided, including with
Lower step：
1) main component is made as the cooling gas of methane and water in water vapour and desulphurised natural gas and is passed through gas-based shaft kiln
Cooling section；
2) will obtain after cooling air cooling metallized pellet mixing with desulphurised natural gas after cooled exhaust gas purification, pressure reforming
After obtain reforming gas, obtain also Primordial Qi after reforming the purification of gas and top gas, heating；
3) reducting pellet is treated in the reduction section of gas-based shaft kiln using also Primordial Qi to be reduced to obtain metallized pellet, and
Metallized pellet is cooled down using gas is cooled down；
4) also Primordial Qi obtains top gas after reducing pelletizing to be restored, and top gas continues to participate in step 2).
The composition of cooled exhaust gas includes carbon monoxide, hydrogen gas and water and methane, and temperature is 200~300 DEG C.Without N2, can be with
As the unstripped gas of gas renormalizing stove 35, the chemical energy of cooled exhaust gas is fully utilized.
The volume fraction for cooling down the main component of gas is methane 80~95%, water vapour 5~20%.
The temperature for cooling down gas is 50~70 DEG C, and pressure is 0.1~0.2MPa；Cooling when being cooled down to metallized pellet
Throughput is 500~700Nm3/t。
Also the pressure of Primordial Qi is 0.1~0.5MPa, and temperature is 800-900 DEG C.
The iron overwhelming majority in metallized pellet exists with metal Iron activiation.
The concrete technology flow process that also Primordial Qi and cooling gas are produced using system as above is as follows：
For the water vapour of desulphurised natural gas and the output of steam boiler 11 by flowmeter, the Composition Control by cooling gas is volume
Fraction CH480~95%, H2O (g) 5~20%, by cooling gas temperature control at 110~150 DEG C, cooling atmospheric pressure control is 0.1
~0.2MPa, storage tank 15 in being passed through first, gas-based shaft kiln cooling section is passed through by flowmeter and regulating valve by storage tank 15 in first
22, it is 500~700Nm to control cooling gas flow3/t.After cooling procedure terminates, the temperature of the cooled exhaust gas of cooled exhaust gas outlet 23
Spend for 200~300 DEG C.The cooled exhaust gas and desulphurised natural gas that shaft furnace cooling section 22 is discharged enter reformer 35 together, produce high
Warm reformer is cooled through apparatus for supercooling 36, and CO is removed in the 3rd purifier 372And H2After O, with being purified by second
Top gas after device 38 purifies is pressurized to 0.1~0.5MPa in pressue device together, is adding after storage tank 310 in the 3rd
800-900 DEG C is heated in thermal 311, Primordial Qi entrance 25 is gone back by the first of the bottom of gas-based shaft kiln reduction section 24 as also Primordial Qi
It is passed through.
At a certain temperature, metallic iron is to CH4There are catalytic action, key reaction formula and thermal effect with the reforming reaction of vapor
Should be as follows：
CH4+H2O=CO+3H2
CO+H2O=CO2+H2
CH4+CO2=2H2+2CO
It may also happen that CH4Cracking reaction and CO disproportionated reaction, reaction equation is as follows：
CH4=C+2H2
2CO=CO2+C
React (1), (3) and (4) are all strong endothermic reactions, and it is exothermic reaction to react (2) and (5), but CH4With H2O reaction
Generally it is still strong endothermic reaction, so gas-based shaft kiln typically requires CH in stove also Primordial Qi4Volume content be less than 3%,
Prevent methane from decomposing a large amount of heat absorptions and causing the temperature of reduction shaft furnace section 24 to significantly reduce.
The present invention is according to catalytic action of the metallic iron to methane and steam reforming reaction, and the highly endothermic spy of the reaction
Point, traditional gaseous mixture directly is replaced as hot (800 DEG C or so) gold with addition of the vapor of proper ratio by the use of desulphurised natural gas
Belong to the cooling gas of pellet, the cooling effect of metallized pellet can not only be significantly improved, and take full advantage of thermal state metal iron
By CH4And H2O is catalytically conveted to CO and H2, the cooled exhaust gas after use can be with desulphurised natural gas together after preliminary purification
Supply reformer 35 is reformed, is mixed to get also Primordial Qi, is that the reduction section 24 of gas-based reduction shaft furnace provides also Primordial Qi.
The standard equilibrium constant of (1) is reacted at 327~827 DEG C much larger than reaction (2), this shows in cooling gas and hot gold
Category pellet started in a period of time of contact, and reaction (1) is main reaction.With metallized pellet temperature be reduced to 327 DEG C with
Under, the standard equilibrium constant of reaction (2) starts to raise and more than (1) is reacted, this shows that reacting (2) turns into main reaction, but now
The temperature of pelletizing has significantly reduced, although the standard equilibrium constant of reaction (2) is larger, the dynamics bar of the two reactions
Part can not meet that they proceed to the requirement of discernable degree.Analyzed more than, using CH4+H2(g, water steam O
Gas) cooling gas of the mixed gas as thermal state metal pellet, in the starting stage that cooling gas is in contact with metallized pellet
It is main that CH occurs4And H2O (g) catalytic conversion reaction (reacting (1)), the vapor for adding proper ratio can be in certain journey
Suppress reaction (4) and reaction (5) on degree, so as to the precipitation of anti-blocking and the carburizing of iron.
On the other hand, it is also necessary to prevent thermal state metal pellet and H2O (g) reactions cause pelletizing secondary oxidation and influence product
Matter is reacted such as formula (6), it is necessary to analyze the condition of hot iron and vapor reaction.
Fe(s)+H2O (g)=FeO (s)+H2(g) (6)
The standard Gibbs free energy of (6) is reacted at 800 DEG CReact the Gibbs free energy of (1)Under physical condition, the Gibbs free energy of (6) is reacted
React the Gibbs free energy of (1)Ensure that reacting (1) preferential reaction (6) enters
OK, Δ G can be made1＜ Δs G6＜ 0, nowH in initial cooling gas2Extremely low, the energy with CO contents
Enough meet the condition.So using CH4+H2Pelletizing will not occur for the metallized pellet that O (g) mixed gas cools down 800 DEG C
Secondary oxidation, the cooling of sponge iron can not only be accelerated, and can effectively be prevented under conditions of shaft furnace operation temperature is improved
The caking at high temperature of pelletizing, additionally it is possible to by the catalytic action of hot sponge iron by portion of natural gas catalytic reforming be CO+H2, with this
It is consistent to invent initial imagination.
Embodiment 1
It is 50 DEG C to cool down temperature degree, cools down CH in gas4Volume fraction is 80%, H2O (g) volume fractions are 20%, cool down gas
Pressure 0.1MPa, cooling gas enter the flow 500Nm of the cooling section 22 of gas-based shaft kiln3/ t DRI (DRI, DRI).With
Existing Midrex techniques are compared, because the catalytic reforming of methane is the endothermic reaction by force, so metallized pellet is in cooling section 22
Shorter residence time 1/4, cool down the dosage of gas by the 1000Nm of traditional Midrex methods3/ t is reduced to 500Nm3/t.Suitable quantity of water
The reaction of analysis carbon and the carburization reaction of iron of cooling section 22 in shaft furnace are inhibited in the addition cooling gas of steam, can be by the ball that metallizes
The phosphorus content stability contorting of group is below 1%.The tail gas main component that shaft furnace cooling section 22 is discharged is CH4, simultaneously containing a small amount of
H2O, CO and H2, without inert gas N2, can also be obtained as the unstripped gas of gas renormalizing stove 35, chemical energy therein
Make full use of.
Embodiment 2
It is 70 DEG C to cool down temperature degree, cools down CH in gas4Volume fraction is 95%, H2O (g) volume fractions are 5%, cool down gas
Pressure 0.2MPa, cooling gas enter the flow 700Nm of the cooling section 22 of gas-based shaft kiln3/tDRI.With existing Midrex techniques phase
Than because the catalytic reforming of methane is the endothermic reaction by force, so shorter residence time 1/ of the metallized pellet in cooling section 22
5, the dosage of gas is cooled down by the 1000Nm of traditional Midrex methods3/ t is reduced to 700Nm3/t.In the addition cooling gas of appropriate vapor
The reaction of analysis carbon and the carburization reaction of iron of cooling section 22 in shaft furnace are inhibited, can be by the phosphorus content stability contorting of metallized pellet
Below 1%.The tail gas main component that shaft furnace cooling section 22 is discharged is CH4, simultaneously containing a small amount of H2O, CO and H2, without inertia
Gas N2, can be fully utilized as the unstripped gas of gas renormalizing stove 35, chemical energy therein.
Embodiment 3
It is 60 DEG C to cool down temperature degree, cools down CH in gas4Volume fraction is 85%, H2O (g) volume fractions are 15%, cool down gas
Pressure 0.15MPa, cooling gas enter the flow 600Nm of the cooling section 22 of gas-based shaft kiln3/tDRI.With existing Midrex techniques
Compare, because the catalytic reforming of methane is the endothermic reaction by force, so shorter residence time of the metallized pellet in cooling section 22
1/4, the dosage of gas is cooled down by the 1000Nm of traditional Midrex methods3/ t is reduced to 600Nm3/t.The addition cooling gas of appropriate vapor
In inhibit the reaction of analysis carbon and the carburization reaction of iron of cooling section 22 in shaft furnace, can control the phosphorus content of metallized pellet is stable
System is below 1%.The tail gas main component that shaft furnace cooling section 22 is discharged is CH4, simultaneously containing a small amount of H2O, CO and H2, without lazy
Property gas N2, can be fully utilized as the unstripped gas of gas renormalizing stove 35, chemical energy therein.
Presently preferred embodiments of the present invention is these are only, is not used for limiting the practical range of the present invention；If this is not departed from
The spirit and scope of invention, modify or equivalent substitution to the present invention, all should cover the protection in the claims in the present invention
Among scope.
Claims (10)
- A kind of 1. method for reducing and cooling down metallized pellet, it is characterised in that comprise the following steps：1) main component is made as the cooling gas of methane and water in water vapour and desulphurised natural gas and is passed through the cooling of gas-based shaft kiln Section；2) it will obtain mixing with desulphurised natural gas after cooled exhaust gas purification after cooling air cooling metallized pellet, be obtained after pressure reforming To gas is reformed, the reformation gas after top gas purification, heating with obtaining also Primordial Qi；3) reducting pellet is treated in the reduction section of gas-based shaft kiln using also Primordial Qi to be reduced to obtain metallized pellet, and utilize Cooling gas cools down to the metallized pellet；4) the also Primordial Qi obtains top gas after reducing the pelletizing to be restored, and the top gas continues to participate in step 2).
- 2. according to the method for claim 1, it is characterised in that the main component of the cooling gas is methane and vapor, Its volume fraction is：Methane 80~95%, water vapour 5~20%.
- 3. according to the method for claim 1, it is characterised in that the composition of the cooled exhaust gas include carbon monoxide, hydrogen, Water and methane, temperature are 200~300 DEG C.
- 4. according to the method for claim 3, it is characterised in that the temperature of the cooling gas is 50~70 DEG C, pressure 0.1 ~0.2MPa.
- 5. according to the method for claim 4, it is characterised in that cooling air-flow when being cooled down to the metallized pellet Measure as 500~700Nm3/t。
- 6. a kind of system for realizing the method described in claim 1-5, it is characterised in that include gas-based shaft kiln, cooling gas supply System and also Primordial Qi supply system,The gas-based shaft kiln includes body of heater, the cooling section that the body of heater includes the reduction section of top setting and bottom is set；It is described Reduction section and the cooling section are disposed adjacent；The bottom of the cooling section is provided with cooling gas entrance, and the cooling section top is provided with Cooled exhaust gas exports；It is provided with top gas at the top of the reduction section to export, the reduction section bottom is provided with first and goes back Primordial Qi entrance；The cooling gas supply system includes storage tank in steam inlet, desulphurised natural gas entrance, the first pressue device and first；Institute State steam inlet and the desulphurised natural gas entrance is respectively equipped with flowmeter；Cut-off is provided with the desulphurised natural gas entrance Valve；The steam inlet and the desulphurised natural gas entrance are connected with first pressue device；First pressue device with Storage tank is connected in described first, and the cooling gas entrance of storage tank and the gas-based shaft kiln is by being provided with flow in described first Meter is connected with the pipeline of stop valve.
- 7. system according to claim 6, it is characterised in that the reduction section bottom is additionally provided with second and goes back Primordial Qi entrance, Described second also Primordial Qi entrance is used to be passed through also Primordial Qi simultaneously with the described first also Primordial Qi entrance.
- 8. system according to claim 6, it is characterised in that the also Primordial Qi supply system includes cooled exhaust gas and reforms system System, furnace roof gas processing system and whole processing system, the cooled exhaust gas reforming system and furnace roof gas processing system are mixed by pipeline Whole processing system is accessed after conjunction,The gas vent of the whole processing system is communicated to the first also Primordial Qi entrance and second and goes back Primordial Qi entrance；The air inlet connection cooled exhaust gas outlet of the cooled exhaust gas reforming system, the air inlet of the furnace roof gas processing system connect Logical top gas outlet.
- 9. system according to claim 8, it is characterised in that the cooled exhaust gas reforming system enters including desulphurised natural gas Storage tank, reforming system in mouth and the first purifier being sequentially communicated along gas path, the second pressue device, second, and it is described Desulphurised natural gas entrance is accessed between first purifier and second pressue device by pipeline；The furnace roof gas processing system includes the second purifier, and the air inlet connection top gas of second purifier goes out Mouthful, the gas outlet of second purifier is accessed after being mixed with the gas outlet of the reforming system by pipeline described to be handled eventually System.
- 10. system according to claim 8, it is characterised in that the whole processing system include be sequentially communicated the 3rd plus Storage tank and heater in pressure device, the 3rd, in the described 3rd the air inlet of storage tank connect the cooled exhaust gas reforming system and The furnace roof gas processing system；The heater connection described first also Primordial Qi entrance and described second goes back Primordial Qi entrance.
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Cited By (6)
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| CN111926135A (en) * | 2020-07-14 | 2020-11-13 | 钢研晟华科技股份有限公司 | Hydrogen-based shaft furnace direct reduction system and reduction method |
| CN114107591A (en) * | 2021-11-26 | 2022-03-01 | 钢铁研究总院 | Heating-pure hydrogen reduction cooling system and method |
| CN114369695A (en) * | 2021-12-10 | 2022-04-19 | 太原理工大成工程有限公司 | Gas-based reduced iron shaft furnace |
| CN115058554A (en) * | 2022-08-08 | 2022-09-16 | 卓然(靖江)设备制造有限公司 | Hydrogen-based shaft furnace with internal energy recovery device |
| CN115820967A (en) * | 2022-12-02 | 2023-03-21 | 中冶长天国际工程有限责任公司 | Method and device for cooling reduction product of rotary kiln |
| WO2024043827A1 (en) * | 2022-09-30 | 2024-02-29 | Hybrit Development Ab | A method for producing cold direct reduced iron |
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2017
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111926135A (en) * | 2020-07-14 | 2020-11-13 | 钢研晟华科技股份有限公司 | Hydrogen-based shaft furnace direct reduction system and reduction method |
| CN111926135B (en) * | 2020-07-14 | 2022-03-29 | 钢研晟华科技股份有限公司 | Hydrogen-based shaft furnace direct reduction system and reduction method |
| CN114107591A (en) * | 2021-11-26 | 2022-03-01 | 钢铁研究总院 | Heating-pure hydrogen reduction cooling system and method |
| CN114369695A (en) * | 2021-12-10 | 2022-04-19 | 太原理工大成工程有限公司 | Gas-based reduced iron shaft furnace |
| CN115058554A (en) * | 2022-08-08 | 2022-09-16 | 卓然(靖江)设备制造有限公司 | Hydrogen-based shaft furnace with internal energy recovery device |
| CN115058554B (en) * | 2022-08-08 | 2022-11-15 | 卓然(靖江)设备制造有限公司 | Hydrogen-based shaft furnace with internal energy recovery device |
| WO2024043827A1 (en) * | 2022-09-30 | 2024-02-29 | Hybrit Development Ab | A method for producing cold direct reduced iron |
| CN115820967A (en) * | 2022-12-02 | 2023-03-21 | 中冶长天国际工程有限责任公司 | Method and device for cooling reduction product of rotary kiln |
| CN115820967B (en) * | 2022-12-02 | 2024-03-12 | 中冶长天国际工程有限责任公司 | Rotary kiln reduction product cooling method and device |
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