CN206607250U - The system that a kind of natural gas tri-reforming prepares DRI - Google Patents
The system that a kind of natural gas tri-reforming prepares DRI Download PDFInfo
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- CN206607250U CN206607250U CN201720203515.0U CN201720203515U CN206607250U CN 206607250 U CN206607250 U CN 206607250U CN 201720203515 U CN201720203515 U CN 201720203515U CN 206607250 U CN206607250 U CN 206607250U
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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 utility model is related to the system that natural gas tri-reforming prepares DRI.In the system, shaft furnace has top gas outlet, also Primordial Qi entrance；First gas unit includes preheating device, desulfurizer, heater, the tri-reforming device being sequentially connected, the top gas outlet of the mixed gas entrance and shaft furnace of preheating device is connected, and the also Primordial Qi outlet of tri-reforming device is connected with the also Primordial Qi entrance of shaft furnace；Second gas unit includes heater, preheating device, and the top gas outlet of the second gas entrance and shaft furnace of heater is connected, and the smoke inlet of preheating device and the exhanst gas outlet of heater are connected；The desulfurization and decarburization device of third gas unit has third gas entrance, third gas outlet, and the top gas outlet of third gas entrance and shaft furnace is connected, and third gas is exported to be connected with the also Primordial Qi entrance of shaft furnace.The utility model, which can avoid methane from entering generation cracking after shaft furnace, causes reduction reaction not smooth, and the nickel-base catalyst of consumption is few, and production cost is low.
Description
Technical field
The utility model is related to metallurgical technology field, and in particular to what a kind of natural gas tri-reforming prepared DRI is
System.
Background technology
DRI is also known as sponge iron, be it is a kind of it is important replace steel scrap and better than the steelmaking feed of steel scrap, can be dilute
The impurity element components in steel scrap are released, essential pure iron material is provided for electric furnace steel making.Development of iron and steel enterprises is directly also
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, high-quality reduction are obtained through reforming reaction using natural gas as unstripped gas
Gas.Top gas is after the dedusting that cools, wherein 60~70% mix with natural gas according to chemical reaction equivalent after compression, it is preheated
Device is preheated, and then passes through the reformer equipped with Raney nickel.In reformer, natural gas and the CO in top gas2And H2O occurs
Reforming reaction, obtain 850~900 DEG C also Primordial Qi, then the reduction pneumatic transmission is entered in shaft furnace.The acid pellet or lump ore of iron content
In shaft furnace DRI is obtained through also Primordial Qi reduction.DRI is discharged perpendicular after the cooling section cooling through shaft furnace bottom
Stove.The cooling gas of cooling section is discharged from shaft furnace, then after water scrubber washing and compressor pressure-raising, sends shaft furnace recycling back to.
But, in this method, reformer involves great expense, and maintenance cost is higher.Also, the sulphur in gas can cause the reformation in reformer
Catalyst poisoning.Therefore, the sulfur content in strict control ore and coal gas is needed in the technique.
The techniques of HYL III are using natural gas and part top gas as raw material, by raw natural gas, transforming agent vapor in weight
Catalytic reforming reaction in whole stove produces also Primordial Qi.The also Primordial Qi produced by reformer, passes through heat reclaim unit, washing cooling
Device processing, is then mixed with top gas of the part through washing cooling, desulfurization and decarburization.The obtained heated stove heat of gaseous mixture is extremely
900~950 DEG C, then pass in 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 reduce oxidizability, Ran Houzai through cooling de-watering
Heat temperature raising.Therefore, in technique less rationally, consume energy higher.
Utility model content
The utility model aims to provide the system that a kind of natural gas tri-reforming prepares DRI, system of the present utility model
System can fully recycle top gas, and improve the tri-reforming efficiency of methane in natural gas.
The utility model provides the system that a kind of natural gas tri-reforming prepares DRI, including shaft furnace, the first gas
Body unit, second gas unit, third gas unit.
The shaft furnace has top gas outlet, also Primordial Qi entrance, iron acid pellet entrance, DRI outlet.
The first gas unit includes preheating device, desulfurizer, heater, the tri-reforming being sequentially connected
Device.The preheating device has mixed gas entrance, and the mixed gas entrance is connected with the top gas outlet of the shaft furnace.Institute
Stating tri-reforming utensil has oxygen intake, also Primordial Qi outlet, and the also Primordial Qi outlet and the also Primordial Qi entrance of the shaft furnace connect
Connect.
The second gas unit includes the heater, the preheating device.The heater has the second gas
Body entrance, exhanst gas outlet, the second gas entrance are connected with the top gas outlet of the shaft furnace.The preheating device has cigarette
Gas entrance, the smoke inlet is connected with the exhanst gas outlet of the heater.
The third gas unit includes desulfurization and decarburization device, and the desulfurization and decarburization device has third gas entrance, the
Three gas vents.The third gas entrance is connected with the top gas outlet of the shaft furnace.Third gas outlet with it is described
The also Primordial Qi entrance connection of shaft furnace.
It is preferred that, the tri-reforming device is provided with multiple, and the multiple tri-reforming device is connected in parallel, described many
The individual tri-reforming device being connected in parallel is connected in series with the heating furnace.
Further, wash mill, the compression set being sequentially connected also are included in above-mentioned system, for washing, compressing
Top gas.The wash mill is connected with the shaft furnace, and the top gas outlet is provided with the compression set.
In system of the present utility model, multiple tri-reforming devices can be set.If urged after tri-reforming overlong time
The activity reduction of agent, it is possible to achieve the replacement between different tri-reforming devices, so as to improve production efficiency.
Natural gas tri-reforming, which can be carried out, using system of the present utility model prepares DRI, wherein, portion of natural gas
Occur in tri-reforming device with oxygen in reforming reaction generation carbon monoxide and hydrogen, remaining natural gas tri-reforming device
Occur reforming reaction with carbon dioxide and water vapour in the presence of catalyst, methane conversion can be effectively improved, it is to avoid methane enters
Entering generation cracking after shaft furnace causes reduction reaction not smooth.Methane occurs after partial oxidation with oxygen, methane content reduction, to residue
When methane carries out carbon dioxide and steam reformation, the nickel-base catalyst of consumption is less, reduces production cost.
Brief description of the drawings
Fig. 1 is the system schematic that the utility model embodiment natural gas tri-reforming prepares DRI.
Fig. 2 is the method stream that the utility model is prepared DRI using the system shown in Fig. 1 by natural gas tri-reforming
Journey schematic diagram.
Reference in accompanying drawing is as follows：
1st, shaft furnace；2nd, wash mill；3rd, compression set；4th, desulfurization and decarburization device；5th, preheating device；6th, desulfurizer；7、
Heater；8th, the first tri-reforming device；9th, the second tri-reforming device；10th, wash mill；11st, compression set.
Embodiment
Below in conjunction with drawings and examples, embodiment of the present utility model is described in more details, with
Just scheme of the present utility model and the advantage of its various aspects be better understood when.However, specific implementations described below
Mode and embodiment are only the purposes of explanation, rather than to limitation of the present utility model.
As shown in figure 1, preparing the system schematic of DRI for natural gas tri-reforming in the utility model embodiment.
System of the present utility model includes shaft furnace, first gas unit, second gas unit, third gas unit.
(1) shaft furnace 1 includes the reduction section on top and the cooling section of bottom.Top gas outlet, also Primordial Qi are provided with shaft furnace 1
Entrance, iron acid pellet entrance, DRI outlet.
In not be the same as Example of the present utility model, cooling gas entrance, cooling gas can be also set on the cooling section of shaft furnace 1
Outlet.Wherein, the outlet of cooling gas is connected with the air inlet of wash mill 10.Compression set 11 is connected with wash mill 10, cooling
The scrubbed device 10 of gas is passed through in compression set 11 after washing, and sends into cooling section by the cooling gas entrance of shaft furnace 1 after compression.It is real
Now the circulating cooling of cooling gas is utilized.
(2) first gas unit includes preheating device 5, desulfurizer 6, heater 7, the tri-reforming being sequentially connected
Device.In not be the same as Example of the present utility model, multiple tri-reforming devices also can be set, first as shown in Fig. 1 is triple
Whole reactor 8, the second tri-reforming device 9.Wherein, the plurality of tri-reforming device is connected in parallel.Also, the plurality of parallel connection is even
The tri-reforming device connect is connected in series with heater 7, is easy to implement the replacement of tri-reforming device.In the utility model not
Limit the quantity of tri-reforming device.
Preheating device 5 has mixed gas entrance.The mixed gas entrance is connected with the top gas outlet of shaft furnace 1.By erecting
The top gas that stove 1 is discharged after preheated device 5, desulfurizer 6, the processing of heater 7, is sent into tri-reforming device successively.
Oxygen intake, also Primordial Qi outlet are additionally provided with tri-reforming device, Primordial Qi outlet should be gone back and the also Primordial Qi entrance of shaft furnace 1 connects
Connect.
(3) second gas unit includes heater 7, preheating device 5.Heater 7 has second gas entrance, flue gas
Outlet.Second gas entrance is connected with the top gas outlet of shaft furnace 1.Preheating device 5 has smoke inlet.Smoke inlet and heating
The exhanst gas outlet connection of device 7.
(4) third gas unit includes desulfurization and decarburization device 4.Desulfurization and decarburization device 4 has third gas entrance, the 3rd gas
Body is exported.Wherein, third gas entrance is connected with the top gas outlet of shaft furnace 1.Third gas outlet and the also Primordial Qi of shaft furnace 1 enter
Mouth connection.
In other embodiments of the present utility model, be provided with wash mill 2, compression set 3, for wash, compress by
The top gas that shaft furnace 1 is discharged.Wherein, the air inlet of wash mill 2 is connected with the top gas outlet of shaft furnace 1.Set on compression set 3
Top gas outlet is equipped with, for compressing the scrubbed top gas discharged by wash mill 2.That is, wash mill 2 and compression set
3 can realize the further processing to top gas according to different production requirements.
As shown in Fig. 2 be the utility model using the system shown in Fig. 1, DRI is prepared by natural gas tri-reforming
Method flow schematic diagram.
The top gas of the top of shaft furnace 1 discharge is scrubbed, be divided into three parts after compression：First gas, second gas, the 3rd gas
Body.
Wherein, the percentage that first gas, second gas, the volume of third gas account for the top gas cumulative volume is respectively
40~70%, 25~40%, 5~20%.
(1) first gas is mixed with natural gas (main component of natural gas is methane), obtains mixed gas.Will mixing
Gas is respectively fed to preheated, desulfurization in preheating device 5, desulfurizer 6, is then fed into heater 7 and heats.Heated
Mixed gas is sent into the first tri-reforming device 8.Meanwhile, it is passed through oxygen into the first tri-reforming device 8.In mixed gas
Methane and carbon dioxide, water, oxygen occur tri-reforming in the first tri-reforming device 8, obtain also Primordial Qi.
In method of the present utility model, two or more tri-reforming devices can be set.If the reaction time is long,
Catalyst activity is caused to reduce, the utility model can realize the replacement between multiple tri-reforming devices, so as to improve production effect
Rate.
Tri-reforming device one end of the present utility model is provided with air inlet, and the part does not contain nickel-base catalyst, is used for
Carry out the partial oxidation of methane.And only remaining methane in nickel-base catalyst, natural gas is provided with the part in another part
Carry out the reforming reaction of methane and carbon dioxide and methane steam.
The volume that oxygen is passed through in tri-reforming device accounts for the 70~80% of natural gas volume.
Temperature after the preheated device 5 of mixed gas is preheated is 200~300 DEG C.The temperature of heated mixed gas is
500~600 DEG C.Mixed gas is after tri-reforming device, and obtained reduction temperature degree is 950~1050 DEG C.
(2) second gas is sent into heater 7 as fuel, is that heater 7 provides fuel gas.
(3) third gas is sent into desulfurization and decarburization device 4.Third gas is mixed after desulfurization and decarburization is handled with also Primordial Qi
Close, be then fed into shaft furnace 1, and the iron acid pellet in reduction shaft furnace, obtain DRI.DRI is through shaft furnace 1
After cooling section cooling, shaft furnace is discharged.
After also Primordial Qi is mixed with third gas, temperature is reduced to 850~900 DEG C.
In cooling section, after cooling air cooling DRI, shaft furnace is discharged.The cooling gas is sequentially sent to wash mill
10th, in compression set 11, after scrubbed, compression, in the cooling section for sending shaft furnace 1 back to again, used as cooling gas circulating cooling.
Embodiment 1
Natural gas is mixed with first gas, obtains mixed gas.Mixed gas is sent into preheating device, temperature is by 40 DEG C
200 DEG C are risen to, after desulfurization process, 500 DEG C are heated in feeding heater.Then, the mixed gas after heating is sent into
In first tri-reforming device, meanwhile, oxygen is passed through thereto.The volume of oxygen is the 70% of natural gas volume.Mixed gas
Occur tri-reforming in the first tri-reforming device with oxygen, obtain also Primordial Qi, reduction temperature degree is 900 DEG C.Also Primordial Qi
After being mixed with the third gas through desulfurization and decarburization, temperature is 850 DEG C, and sends into reduced iron acid pellet in shaft furnace, is made steel
Use DRI.In reduction process, the top gas discharged by shaft furnace is scrubbed, dehydration, after compression, be divided into according to volume accounting
Three parts：60% mixes as the first gas in the present embodiment with natural gas, and 35% is used as the second gas in the present embodiment
It is passed through heater and does fuel gas, 5% is used as the third gas in the present embodiment.Cool down the direct-reduction below air cooling shaft furnace
After iron, shaft furnace is discharged, sending cooling section circulating cooling back to after then scrubbed, compression uses.
Embodiment 2
Natural gas is mixed with first gas, obtains mixed gas.Mixed gas is sent into preheating device, temperature is by 30 DEG C
220 DEG C are risen to, after desulfurization process, 550 DEG C are heated in feeding heater.Then, the mixed gas after heating is sent into
In second tri-reforming device, meanwhile, oxygen is passed through thereto.The volume of oxygen is the 75% of natural gas volume.Mixed gas
Occur tri-reforming in the second tri-reforming device with oxygen, obtain also Primordial Qi, reduction temperature degree is 1000 DEG C.Also Primordial Qi
After being mixed with the third gas through desulfurization and decarburization, temperature is 900 DEG C, and sends into reduced iron acid pellet in shaft furnace, is made steel
Use DRI.In reduction process, the top gas discharged by shaft furnace is scrubbed, dehydration, after compression, be divided into according to volume accounting
Three parts：50% mixes as the first gas in the present embodiment with natural gas, and 40% is used as the second gas in the present embodiment
It is passed through heater and does fuel gas, 10% is used as the third gas in the present embodiment.Cool down directly going back below air cooling shaft furnace
After former iron, shaft furnace is discharged, sending cooling section circulating cooling back to after then scrubbed, compression uses.
Embodiment 3
Natural gas is mixed with first gas, obtains mixed gas.Mixed gas is sent into preheating device, temperature is by 60 DEG C
300 DEG C are risen to, after desulfurization process, 600 DEG C are heated in feeding heater.Then, the mixed gas after heating is sent into
In first tri-reforming device, meanwhile, oxygen is passed through thereto.Wherein, the volume of oxygen is the 80% of natural gas volume.Mixing
With oxygen in the first tri-reforming device tri-reforming occurs for gas, obtains also Primordial Qi, and reduction temperature degree is 1050 DEG C.Also
After Primordial Qi is mixed with the third gas through desulfurization and decarburization, temperature is 880 DEG C, and sends into reduced iron acid pellet in shaft furnace, is obtained
Steel-making DRI.In reduction process, the top gas discharged by shaft furnace is scrubbed, dehydration, after compression, according to volume accounting
It is divided into three parts：65% mixes as the first gas in the present embodiment with natural gas, and 25% is used as second in the present embodiment
Gas is passed through heater and does fuel gas, and 10% is used as the third gas in the present embodiment.Cool down straight below air cooling shaft furnace
Connect after reduced iron, discharge shaft furnace, sending cooling section circulating cooling back to after then scrubbed, compression uses.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate the utility model example,
And the not restriction to embodiment.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms.There is no necessity and possibility to exhaust all the enbodiments.And thus
Among the obvious changes or variations amplified out is still in protection domain of the present utility model.
Claims (3)
1. the system that a kind of natural gas tri-reforming prepares DRI, it is characterised in that the system includes shaft furnace, the first gas
Body unit, second gas unit, third gas unit；
The shaft furnace has top gas outlet, also Primordial Qi entrance, iron acid pellet entrance, DRI outlet；
The first gas unit includes preheating device, desulfurizer, heater, the tri-reforming device being sequentially connected；Institute
Stating preheating device has mixed gas entrance, and the mixed gas entrance is connected with the top gas outlet of the shaft furnace；Described three
Reforming reactor has oxygen intake, also Primordial Qi outlet, and the also Primordial Qi outlet is connected with the also Primordial Qi entrance of the shaft furnace；
The second gas unit includes the heater, the preheating device；There is the heater second gas to enter
Mouth, exhanst gas outlet, the second gas entrance are connected with the top gas outlet of the shaft furnace；There is the preheating device flue gas to enter
Mouthful, the smoke inlet is connected with the exhanst gas outlet of the heater；
The third gas unit includes desulfurization and decarburization device, and the desulfurization and decarburization device has third gas entrance, the 3rd gas
Body is exported；The third gas entrance is connected with the top gas outlet of the shaft furnace, the third gas outlet and the shaft furnace
Also Primordial Qi entrance connection.
2. system according to claim 1, it is characterised in that the tri-reforming device is provided with multiple；It is the multiple
Tri-reforming device is connected in parallel, and the multiple tri-reforming device being connected in parallel is connected in series with the heating furnace.
3. system according to claim 1, it is characterised in that also including the wash mill, the compression set that are sequentially connected, is used
In washing, compression top gas；The wash mill is connected with the shaft furnace, and the top gas is provided with the compression set and is gone out
Mouthful.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720203515.0U CN206607250U (en) | 2017-03-03 | 2017-03-03 | The system that a kind of natural gas tri-reforming prepares DRI |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720203515.0U CN206607250U (en) | 2017-03-03 | 2017-03-03 | The system that a kind of natural gas tri-reforming prepares DRI |
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| CN206607250U true CN206607250U (en) | 2017-11-03 |
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| CN201720203515.0U Expired - Fee Related CN206607250U (en) | 2017-03-03 | 2017-03-03 | The system that a kind of natural gas tri-reforming prepares DRI |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106834579A (en) * | 2017-03-03 | 2017-06-13 | 江苏省冶金设计院有限公司 | The system and method that a kind of natural gas tri-reforming prepares DRI |
-
2017
- 2017-03-03 CN CN201720203515.0U patent/CN206607250U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106834579A (en) * | 2017-03-03 | 2017-06-13 | 江苏省冶金设计院有限公司 | The system and method that a kind of natural gas tri-reforming prepares DRI |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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| CF01 | Termination of patent right due to non-payment of annual fee |