CN106435081A - Preparation system of direct reduction iron and preparation method - Google Patents
Preparation system of direct reduction iron and preparation method Download PDFInfo
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- CN106435081A CN106435081A CN201611168606.1A CN201611168606A CN106435081A CN 106435081 A CN106435081 A CN 106435081A CN 201611168606 A CN201611168606 A CN 201611168606A CN 106435081 A CN106435081 A CN 106435081A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- Manufacture Of Iron (AREA)
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Abstract
The invention discloses a preparation system of direct reduction iron and a preparation method. The system includes a desulfurizer which has a natural gas inlet and a desulfurized natural gas outlet; a segmental part oxidized-reforming furnace, which is provided with a first desulfurized natural gas inlet, a second desulfurized natural gas inlet, an oxygen inlet and a first reduction gas outlet; the first desulfurized natural gas inlet and the second desulfurized natural gas inlet are respectively connected with the desulfurized natural gas outlet; a gas base shaft furnace, which is provided with an iron ore inlet, a reduction gas inlet, a high-temperature furnace roof gas outlet and a direct reduction iron outlet; the reduction iron gas inlet is connected with the first reduction gas outlet; the segmental part oxidized-reforming furnace comprises a partial oxidizing device and a reforming device; the partial oxidizing device is located beneath the reforming device; the first desulfurized natural gas inlet and the oxygen inlet are arranged on the partial oxygen device, the second desulfurized natural gas inlet and the first reduction gas outlet are arranged on the reforming device. The metallization ratio of the direct reduction iron is high, and the production cost is low.
Description
Technical field
The invention belongs to direct reduction processes of Iron ores field, and in particular to a kind of system of DRI and preparation side
Method.
Background technology
DRI (DRI), also known as sponge iron, is that iron ore is reduced directly the iron content for obtaining under less than fusion temperature
Product.Sponge iron is a kind of succedaneum of steel scrap, is electric furnace refining clean steel, the indispensable impurity diluent of high-quality steel, is to turn
The coolant of stove steel-making high-quality, is to develop the indispensable raw material of Ferrous Metallurgy short route.2014, whole world DRI
Annual production reach 74,500,000 tons, record high.China by direct-reduction technique be classified as development of iron ＆ steel industry Main way it
One.
The technique of production DRI is referred to as direct-reduction process, belongs to non-blast furnace ironmaking technique, is divided into gas base method and coal
Two big class of base method.Wherein, 76% DRI is produced by gas base method.Using also Primordial Qi, (which mainly becomes gas base method
It is divided into CO and H2) reducing iron ore, prepare DRI.At present, also Primordial Qi is mainly obtained with natural gas as raw material.Existing
The technique productions cost for preparing also Primordial Qi using natural gas is very high, causes the cost of the DRI of gained also very high.
In order to the defect of prior art is solved, reduce the production cost of DRI, have a kind of new production to be developed
The technique of DRI.
Content of the invention
For the deficiencies in the prior art, present invention firstly provides a kind of preparation system of DRI, the system
Including：
Devulcanizer, exports with gas inlet and desulphurised natural gas；
Section oxidation-reformer, with the first desulphurised natural gas entrance, the second desulphurised natural gas entrance, oxygen
Entrance and the first also Primordial Qi outlet, the first desulphurised natural gas entrance and the second desulphurised natural gas entrance respectively with described
The desulphurised natural gas outlet of devulcanizer is connected；
Gas-based shaft kiln, with iron ore entrance, also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet, institute
State also Primordial Qi entrance aoxidize with the section-the first also Primordial Qi of reformer exports and is connected；
Section oxidation-the reformer includes partial oxidation unit and reformer, the partial oxidation unit
Positioned at the lower section of the reformer, the first desulphurised natural gas entrance and the oxygen intake are arranged on the partial oxidation
On device, the second desulphurised natural gas entrance and the described first also Primordial Qi outlet are arranged on the reformer.
In some embodiments of the invention, the system also includes purification-heat exchanger, and the purification-heat exchanger has
Cryogenic natural gas entrance, high temperature furnace top gas entrance, high-temperature natural gas outlet and the outlet of low temperature top gas, the high temperature furnace top gas enters
Mouth is connected with the high temperature furnace top gas outlet of the gas-based shaft kiln, and the high-temperature natural gas outlet is entered with the natural gas of the devulcanizer
Mouth is connected.
In some embodiments of the invention, the system also includes：
Compressor, with low temperature top gas entrance, compression top gas outlet, the low temperature top gas entrance is net with described
The low temperature top gas outlet of change-heat exchanger is connected；
Decarbonizing tower, with compression top gas entrance, the second also Primordial Qi outlet, the compression top gas entrance and the compression
The compression top gas outlet of machine is connected, and the described second also Primordial Qi outlet is connected with the also Primordial Qi entrance of the gas-based shaft kiln.
In some embodiments of the invention, the system also includes heating furnace, the heating furnace have fuel gas entrance,
Second also Primordial Qi entrance and the outlet of pre- thermal reduction gas, the fuel gas entrance is gone out with the low temperature top gas of the purification-heat exchanger
Mouth is connected, and the described second also Primordial Qi entrance is connected with the second also Primordial Qi outlet of the decarbonizing tower, and the pre- thermal reduction gas are exported
It is connected with the also Primordial Qi entrance of the gas-based shaft kiln.
Additionally, present invention also offers a kind of utilization said system method for producing DRI, methods described includes
Following steps：
Prepare natural gas, oxygen and iron ore；
The natural gas is sent in the devulcanizer, the sulfur in the natural gas is removed, obtain desulphurised natural gas；
The desulphurised natural gas of 75%-85% are sent into the partial oxidation dress of the section oxidation-reformer
In putting, partial oxidation reaction being carried out with the oxygen, obtains mixed gas；
The desulphurised natural gas of remaining 15%-25% are sent into the reformation of the section oxidation-reformer
In device, reforming reaction being carried out with the mixed gas, obtains first and go back Primordial Qi；
Described first reduction pneumatic transmission is entered in the gas-based shaft kiln, for reducing iron ore, prepares DRI.
In some embodiments of the invention, in reducing iron ore, the gas-based shaft kiln can also produce high temperature furnace top gas；
Heat exchange is first carried out with the high temperature furnace top gas and the natural gas, then the natural gas is sent into desulfurization in the devulcanizer；And
While heat exchange, the high temperature furnace top gas is purified.
In some embodiments of the invention, the high temperature furnace top gas is changed into low temperature top gas through heat exchange and after purifying,
Will the low temperature top gas compress after carry out carbonization treatment, obtain the second also Primordial Qi, then will described second and also Primordial Qi with described
First also Primordial Qi is sent in the gas-based shaft kiln, for preparing DRI after mixing.
In some embodiments of the invention, the high temperature furnace top gas is changed into low temperature top gas through heat exchange and after purifying；
Carbonization treatment will be carried out after the low temperature top gas compression of 80%-90%, and obtain second and go back Primordial Qi；And by remaining 10%-
The 20% low temperature top gas is burnt, and the heat of acquisition goes back Primordial Qi for preheating described second；Then by after preheating
Described second also Primordial Qi with described first also Primordial Qi mix after send in the gas-based shaft kiln, for preparing DRI.
In some embodiments of the invention, the desulphurised natural gas at a temperature of 1250 DEG C -1350 DEG C with the oxygen
Gas carries out partial oxidation reaction.
In some embodiments of the invention, reducing iron ore at a temperature of 800 DEG C -950 DEG C, prepares direct-reduction
Ferrum.
Also Primordial Qi used by the present invention is mainly prepared using section oxidation-reformer.The section
Oxidation-reformer is first aoxidized with oxygen with natural gas, then the mixed gas for being produced with oxidation carry out reforming instead with natural gas
Should, prepare also Primordial Qi.Natural gas is exothermic reaction with the oxidation reaction of oxygen, and obtained mixed gas are high-temperature gas mixture body,
Therefore, in reforming reaction, without the need for outside heat supply, production cost is reduced.
Additionally, the section oxidation-reformer simple structure, and in use without the need for expensive nickel-base catalyst,
Maintenance cost is low.
Secondly, the obtained also Primordial Qi quality height of the present invention, reducing power are strong, also CO and H in Primordial Qi2Content about exist
90% or so, and the content of vapor in Primordial Qi is gone back less than 5%.
Description of the drawings
Fig. 1 is a kind of structural representation of the preparation system of the DRI in the embodiment of the present invention；
Fig. 2 is a kind of process chart using above-mentioned production DRI in the embodiment of the present invention.
Specific embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in more details, so as to energy
The advantage of the solution of the present invention and its various aspects is enough more fully understood.However, specific embodiments described below and reality
It is only descriptive purpose to apply example, rather than limitation of the present invention.
The preparation system of the DRI that the present invention is provided includes：Devulcanizer, which has gas inlet and desulfurization day
So gas outlet；Section oxidation-reformer, which has the first desulphurised natural gas entrance, the second desulphurised natural gas entrance, oxygen
Gas entrance and the first also Primordial Qi outlet, the first desulphurised natural gas entrance and the second desulphurised natural gas entrance are de- with devulcanizer respectively
Sulfur gas outlet is connected；Gas-based shaft kiln, which has iron ore entrance, also Primordial Qi entrance, high temperature furnace top gas and exports and directly go back
Former ferrum outlet, also Primordial Qi entrance are connected with the first also Primordial Qi outlet of section oxidation-reformer.
The present invention using section oxidation-reformer include partial oxidation unit and reformer, partial oxidation
Device is located at the lower section of reformer, and the first desulphurised natural gas entrance and oxygen intake are arranged on partial oxidation unit, and second
Desulphurised natural gas entrance and the first also Primordial Qi outlet are arranged on reformer.
Section oxidation-the reformer is first aoxidized with oxygen with natural gas, then the gaseous mixture for being produced with oxidation
Body carries out reforming reaction with natural gas, prepares also Primordial Qi.Natural gas is exothermic reaction with the oxidation reaction of oxygen, obtained mixing
Gas is high-temperature gas mixture body, therefore, in reforming reaction, without the need for outside heat supply, reduces production cost.
Additionally, the section oxidation-reformer simple structure, and in use without the need for expensive nickel-base catalyst,
Maintenance cost is low.
The obtained also Primordial Qi quality of said system is high, reducing power is strong, also CO and H in Primordial Qi2Content about 90%
Left and right, and the content of vapor in Primordial Qi is gone back less than 5%.In the present invention, also Primordial Qi obtained in said system is referred to as the first reduction
Gas.
Secondly, the reaction of also Primordial Qi reducing iron ore is the endothermic reaction, and discharges from the section oxidation-reformer
The first reduction temperature degree higher, can be that the reduction reaction of iron ore provides a part of heat, reduce DRI
Production cost.
In the preferred embodiment of the invention, with reference to Fig. 1, said system also includes purification-heat exchanger, purification-heat exchanger
With cryogenic natural gas entrance, high temperature furnace top gas entrance, high-temperature natural gas outlet and the outlet of low temperature top gas, high temperature furnace top gas enters
Mouth is connected with the high temperature furnace top gas outlet of gas-based shaft kiln, and high-temperature natural gas outlet is connected with the gas inlet of devulcanizer.
Wherein, purification-heat exchanger is used for reclaiming the heat of high temperature furnace top gas, and high temperature furnace top gas is purified, and reclaims
Heat be used for preheat natural gas.
In above preferred embodiment, system is also processed to the high temperature furnace top gas that discharges from gas-based shaft kiln, and is returned
Heat is received, not only environmental protection, and heat utilization ratio height.
In the further preferred embodiment of the present invention, with reference to Fig. 1, said system still further comprises compressor and decarburization
Tower.Compressor and decarbonizing tower are used for processing low temperature top gas, prepare second and go back Primordial Qi.
Compressor has low temperature top gas entrance, compression top gas outlet, low temperature top gas entrance and purification-heat exchanger
The outlet of low temperature top gas is connected.Decarbonizing tower has compression top gas entrance, the second also Primordial Qi outlet, compression top gas entrance and pressure
The compression top gas outlet of contracting machine is connected, and the second also Primordial Qi outlet is connected with the also Primordial Qi entrance of gas-based shaft kiln.
Also many CO and H are contained in top gas2, after overcompression and decarburization, it is CO and H that remaining gas is most of2,
Can be used for reducing iron ore.In above-mentioned preferred embodiment, low temperature top gas is further employed, and not only reduces directly also
The production cost of former ferrum, while it also avoid N in top gas2Enrichment.
In a further preferred embodiment, with reference to Fig. 1, said system still further comprises heating furnace.Heating furnace has
Fuel gas entrance, the second also Primordial Qi entrance and outlet of pre- thermal reduction gas, the low temperature top gas of fuel gas entrance and purification-heat exchanger
Export and be connected, the second also Primordial Qi entrance is connected with the second also Primordial Qi outlet of decarbonizing tower, and pre- thermal reduction gas are exported and gas-based shaft kiln
Also Primordial Qi entrance be connected.
It is the same as those described above, in top gas, contains many CO and H2, in above preferred embodiment, a part of top gas is through overvoltage
Contracting and carbonization treatment, go back Primordial Qi for preparing second；Another part top gas is burned, and the heat for obtaining that burns is for preheating system
Second for obtaining also Primordial Qi, can be that the reduction reaction of iron ore provides a part of heat, reduce the production cost of DRI.
Invention further provides a kind of method that utilization said system produces DRI, the method includes as follows
Step：
Prepare natural gas, oxygen and iron ore；
Natural gas is sent in devulcanizer, the sulfur in natural gas is removed, obtain desulphurised natural gas；
The desulphurised natural gas of 75%-85% are sent in the partial oxidation unit of section oxidation-reformer, with oxygen
Gas carries out partial oxidation reaction, obtains mixed gas；
The desulphurised natural gas of remaining 15%-25% are sent in the reformer of section oxidation-reformer, with
Mixed gas carry out reforming reaction, obtain first and go back Primordial Qi；
First reduction pneumatic transmission is entered in gas-based shaft kiln, for reducing iron ore, prepares DRI.
Wherein, mixed gas are mainly vapor and CO2.Temperature degree is reduced using said method is prepared first to exist
900 DEG C -1000 DEG C or so.
It is the same as those described above, in reducing iron ore, gas-based shaft kiln can also produce high temperature furnace top gas；Can first with high temperature furnace top gas with
Natural gas carries out heat exchange, then the natural gas after preheating is sent into desulfurization in devulcanizer；And to high temperature furnace top gas while heat exchange
Purified.
It is the same as those described above, high temperature furnace top gas is changed into low temperature top gas through heat exchange and after purifying, and can compress low temperature top gas
After carry out carbonization treatment, prepare the second also Primordial Qi, then by second also Primordial Qi with first also Primordial Qi mix after feeding gas-based shaft kiln
In, for preparing DRI.
It is the same as those described above, carbonization treatment can be carried out after the low temperature top gas compression of 85%-90%, prepare second and go back Primordial Qi；
And the low temperature top gas of remaining 10%-15% is burnt, the heat for obtaining is used for the also Primordial Qi of preheating second；Then will
The also Primordial Qi of after preheating second is gone back after Primordial Qi mixes with first and is sent in gas-based shaft kiln, for preparing DRI.
In the preferred embodiment of the invention, desulphurised natural gas carry out portion with oxygen at a temperature of 1250 DEG C -1350 DEG C
Divide oxidation reaction.Natural gas is the endothermic reaction with the oxidation reaction of oxygen, finds through substantial amounts of experiment, at 1250 DEG C -1350
At a temperature of DEG C, natural gas must compare completely with oxygen reaction, the carrying out for being conducive to subsequent reformation to react.
In the preferred embodiment of the invention, reducing iron ore at a temperature of 800 DEG C -950 DEG C, prepare direct-reduction
Ferrum.It is the same as those described above, also Primordial Qi is the endothermic reaction with the reduction reaction of iron ore, but due to the obtained first reduction temperature degree relatively
Height, therefore, iron ore just can be very good to be reduced at a temperature of 800 DEG C -950 DEG C.
It should be noted that the beneficial effect of each device and above-mentioned producing DRI using the system in said system
The beneficial effect of method overlap, in order to more succinct, excessively do not describe in method part.Additionally, institute of the present invention
The percentage composition for having the gas for referring to is volume content, and the percentage ratio of gas is percent by volume.
Below with reference to specific embodiment, the present invention will be described.In following embodiments, institute's taking technique condition value is
Exemplary, its desirable numerical range is as shown in foregoing summary.Detection method used by following embodiments is one's own profession
The detection method of industry routine.
Embodiment 1
The present embodiment provides a kind of preparation system of DRI, and Fig. 1 is its structural representation.
As shown in figure 1, the system includes：Gas-based shaft kiln 1, purification-heat exchanger 2, devulcanizer 3, section oxidation-weight
Whole stove 4, compressor 5, decarbonizing tower 6 and heating furnace 7.
Gas-based shaft kiln 1 is with iron ore entrance, also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet.
Purification-heat exchanger 2 is with cryogenic natural gas entrance, high temperature furnace top gas entrance, high-temperature natural gas outlet and low temperature oven
Top gas is exported, and high temperature furnace top gas entrance is connected with the high temperature furnace top gas outlet of gas-based shaft kiln 1.
Devulcanizer 3 is exported with gas inlet and desulphurised natural gas, the high temperature of gas inlet and purification-heat exchanger 2
Gas outlet is connected.
Section oxidation-reformer 4 has the first desulphurised natural gas entrance, the second desulphurised natural gas entrance, oxygen
Entrance and the first also Primordial Qi outlet, the first desulphurised natural gas entrance and the second desulphurised natural gas entrance are de- with devulcanizer 3 respectively
Sulfur gas outlet is connected, and the first also Primordial Qi outlet is connected with the also Primordial Qi entrance of gas-based shaft kiln 1.
As shown in figure 1, section oxidation-reformer 4 includes partial oxidation unit (the stagewise portion i.e. shown in Fig. 1
The lower section of the dotted line in point oxidation-reformer 4) and reformer (in the section oxidation-reformer 4 i.e. shown in Fig. 1
The top of dotted line), partial oxidation unit is located at the lower section of reformer, and the first desulphurised natural gas entrance and oxygen intake are arranged on
On partial oxidation unit, the second desulphurised natural gas entrance and the first also Primordial Qi outlet are arranged on reformer.
Compressor 5 is with low temperature top gas entrance, compression top gas outlet, low temperature top gas entrance and purification-heat exchanger 2
Low temperature top gas outlet be connected.
Decarbonizing tower 6 has compression top gas entrance, the second also Primordial Qi outlet, compresses the pressure of top gas entrance and compressor 5
The outlet of contracting top gas is connected.
Heating furnace 7 with fuel gas entrance, the second also Primordial Qi entrance and outlet of pre- thermal reduction gas, fuel gas entrance with net
The low temperature top gas outlet of change-heat exchanger 2 is connected, and the second also Primordial Qi entrance is connected with the second also Primordial Qi outlet of decarbonizing tower 6, in advance
Thermal reduction gas are exported and are connected with the also Primordial Qi entrance of gas-based shaft kiln 1.
Embodiment 2
The present embodiment provides a kind of method of the system production DRI described in utilization embodiment 1, its technological process
As shown in Fig. 2 specific as follows：
Prepare raw material：Prepare natural gas, oxygen, iron ore.
Prepare first and go back Primordial Qi：The High-temperature furnace top pneumatic transmission that discharges from gas-based shaft kiln 1 is entered in purification-heat exchanger 2 and is purified, and
With heat exchange gas, high temperature furnace top gas is changed into low temperature top gas.Natural gas after preheating is sent into desulfurization in devulcanizer 3.80%
Desulphurised natural gas be admitted to section oxidation-reformer 4 partial oxidation unit and preheating oxygen carry out part oxygen
Change and react, prepared mixed gas, reaction temperature is 1310 DEG C.Mixed gas are further fed into section oxidation-reformation
The reformer of stove 4, carries out reforming reaction with remaining 20% desulphurised natural gas, generates first and goes back Primordial Qi, and first goes back Primordial Qi
About 950 DEG C of temperature.
Prepare second and go back Primordial Qi：86% low temperature top gas is sequentially sent to be compressed in compressor 5 and decarbonizing tower 6 and
Decarburization, is obtained second and goes back Primordial Qi.Remaining 14% low temperature top gas is sent in heating furnace 7 and is burnt, and the heat with generation
Preheat from the second of the discharge of decarbonizing tower 6 and go back Primordial Qi.The temperature of the also Primordial Qi of second after preheating is 880 DEG C.
Reducing iron ore：First also Primordial Qi is mixed with the second also Primordial Qi, is then fed into reduction of iron ore in gas-based shaft kiln 1
Stone, prepares DRI.The temperature of obtained mixing also Primordial Qi is about 900 DEG C, the content of vapor in mixing also Primordial Qi
It is 34%, H for the content of 3.9%, CO2Content be 55%.The degree of metalization of obtained DRI is 93%.
Embodiment 3
The present embodiment provides a kind of method of the system production DRI described in utilization embodiment 1, its technological process
As shown in Fig. 2 specific as follows：
Prepare raw material：Prepare natural gas, oxygen, iron ore.
Prepare first and go back Primordial Qi：The High-temperature furnace top pneumatic transmission that discharges from gas-based shaft kiln 1 is entered in purification-heat exchanger 2 and is purified, and
With heat exchange gas, high temperature furnace top gas is changed into low temperature top gas.Natural gas after preheating is sent into desulfurization in devulcanizer 3.84%
Desulphurised natural gas be admitted to section oxidation-reformer 4 partial oxidation unit and preheating oxygen carry out part oxygen
Change and react, prepared mixed gas, reaction temperature is 1260 DEG C.Mixed gas are further fed into section oxidation-reformation
The reformer of stove 4, carries out reforming reaction with remaining 16% desulphurised natural gas, generates first and goes back Primordial Qi, and first goes back Primordial Qi
About 940 DEG C of temperature.
Prepare second and go back Primordial Qi：90% low temperature top gas is sequentially sent to be compressed in compressor 5 and decarbonizing tower 6 and
Decarburization, is obtained second and goes back Primordial Qi.Remaining 10% low temperature top gas is sent in heating furnace 7 and is burnt, and the heat with generation
Preheat from the second of the discharge of decarbonizing tower 6 and go back Primordial Qi.The temperature of the also Primordial Qi of second after preheating is 870 DEG C.
Reducing iron ore：First also Primordial Qi is mixed with the second also Primordial Qi, is then fed into reduction of iron ore in gas-based shaft kiln 1
Stone, prepares DRI.The temperature of obtained mixing also Primordial Qi is about 900 DEG C, the content of vapor in mixing also Primordial Qi
It is 31%, H for the content of 4%, CO2Content be 60%.The degree of metalization of obtained DRI is 96%.
Knowable to above-described embodiment, using the present invention provide technique obtained in DRI quality height, and produce
Low cost.
To sum up, the also Primordial Qi used by the present invention is mainly prepared using section oxidation-reformer.The stagewise
Partial oxidation-reformer is first aoxidized with oxygen with natural gas, then the mixed gas for being produced with oxidation carry out weight with natural gas
Whole reaction, prepares also Primordial Qi.Natural gas is exothermic reaction with the oxidation reaction of oxygen, and obtained mixed gas are high-temperature gas mixture
Body, therefore, in reforming reaction, without the need for outside heat supply, reduces production cost.
Additionally, the section oxidation-reformer simple structure, and in use without the need for expensive nickel-base catalyst,
Maintenance cost is low.
Secondly, the obtained also Primordial Qi quality height of the present invention, reducing power are strong, also CO and H in Primordial Qi2Content about exist
90% or so, and the content of vapor in Primordial Qi is gone back less than 5%.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and simultaneously
The non-restriction to embodiment.For those of ordinary skill in the field, can also do on the basis of the above description
Go out change or the variation of other multi-forms.There is no need to be exhaustive to all of embodiment.And thus drawn
Obvious change or change among still in protection scope of the present invention that Shen goes out.
Claims (10)
1. a kind of preparation system of DRI, it is characterised in that the system includes：
Devulcanizer, exports with gas inlet and desulphurised natural gas；
Section oxidation-reformer, with the first desulphurised natural gas entrance, the second desulphurised natural gas entrance, oxygen intake
With the first also Primordial Qi outlet, the first desulphurised natural gas entrance and the second desulphurised natural gas entrance respectively with the desulfurization
The desulphurised natural gas outlet of device is connected；
Gas-based shaft kiln, with iron ore entrance, also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet, described also
Primordial Qi entrance aoxidized with the section-and the first also Primordial Qi outlet of reformer is connected；
Section oxidation-the reformer includes partial oxidation unit and reformer, and the partial oxidation unit is located at
The lower section of the reformer, the first desulphurised natural gas entrance and the oxygen intake are arranged on the partial oxidation unit
On, the second desulphurised natural gas entrance and the described first also Primordial Qi outlet are arranged on the reformer.
2. system according to claim 1, it is characterised in that the system also includes purification-heat exchanger, the purification-
Heat exchanger has cryogenic natural gas entrance, high temperature furnace top gas entrance, high-temperature natural gas outlet and the outlet of low temperature top gas, the height
Warm top gas entrance is connected with the high temperature furnace top gas outlet of the gas-based shaft kiln, and the high-temperature natural gas are exported and the devulcanizer
Gas inlet be connected.
3. system according to claim 2, it is characterised in that the system also includes：
Compressor, with low temperature top gas entrance, compression top gas outlet, the low temperature top gas entrance and the purification-change
The low temperature top gas outlet of hot device is connected；
Decarbonizing tower, with compression top gas entrance, the second also Primordial Qi outlet, the compression top gas entrance and the compressor
Compression top gas outlet is connected, and the described second also Primordial Qi outlet is connected with the also Primordial Qi entrance of the gas-based shaft kiln.
4. system according to claim 3, it is characterised in that the system also includes heating furnace, and the heating furnace has
Fuel gas entrance, the second also Primordial Qi entrance and outlet of pre- thermal reduction gas, the fuel gas entrance is low with the purification-heat exchanger
Warm top gas outlet is connected, and the described second also Primordial Qi entrance is connected with the second also Primordial Qi outlet of the decarbonizing tower, the preheating
Also Primordial Qi outlet is connected with the also Primordial Qi entrance of the gas-based shaft kiln.
5. a kind of method that in utilization claim 1-4, arbitrary system produces DRI, it is characterised in that the side
Method comprises the steps：
Prepare natural gas, oxygen and iron ore；
The natural gas is sent in the devulcanizer, the sulfur in the natural gas is removed, obtain desulphurised natural gas；
The desulphurised natural gas of 75%-85% are sent in the partial oxidation unit of the section oxidation-reformer,
Partial oxidation reaction is carried out with the oxygen, obtain mixed gas；
The desulphurised natural gas of remaining 15%-25% are sent into the reformer of the section oxidation-reformer
In, reforming reaction being carried out with the mixed gas, obtains first and go back Primordial Qi；
Described first reduction pneumatic transmission is entered in the gas-based shaft kiln, for reducing iron ore, prepares DRI.
6. method according to claim 5, it is characterised in that in reducing iron ore, the gas-based shaft kiln can also be produced
High temperature furnace top gas；Heat exchange is first carried out with the high temperature furnace top gas and the natural gas, then the natural gas after preheating is sent into
Desulfurization in the devulcanizer；And while heat exchange, the high temperature furnace top gas is purified.
7. method according to claim 6, it is characterised in that the high temperature furnace top gas is changed into low through heat exchange and after purifying
Warm top gas, carries out carbonization treatment after the low temperature top gas is compressed, obtain second and go back Primordial Qi, then reduce described second
Gas is gone back after Primordial Qi mixes with described first and is sent in the gas-based shaft kiln, for preparing DRI.
8. method according to claim 6, it is characterised in that the high temperature furnace top gas is changed into low through heat exchange and after purifying
Warm top gas；Carbonization treatment will be carried out after the low temperature top gas compression of 85%-90%, and obtain second and go back Primordial Qi；And will be surplus
Under the low temperature top gas of 10%-15% burnt, the heat of acquisition is used for preheating the described second also Primordial Qi；Then will
The also Primordial Qi of after preheating described second is gone back after Primordial Qi mixes with described first and is sent in the gas-based shaft kiln, for preparing directly also
Former ferrum.
9. method according to claim 5, it is characterised in that the desulphurised natural gas are in 1250 DEG C -1350 DEG C of temperature
Under carry out partial oxidation reaction with the oxygen.
10. method according to claim 5, it is characterised in that reducing iron ore at a temperature of 800 DEG C -950 DEG C, system
Standby DRI.
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Cited By (3)
| 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 |
| CN107354260A (en) * | 2017-08-31 | 2017-11-17 | 江苏省冶金设计院有限公司 | A kind of system and method that DRI is smelted using clean pyrolysis gas |
| CN111961784A (en) * | 2020-08-31 | 2020-11-20 | 山东大学 | Method and system for reduction reaction of iron ore powder in bubbling bed |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276133A (en) * | 2013-05-31 | 2013-09-04 | 北京神雾环境能源科技集团股份有限公司 | Method for producing direct reduction iron by utilizing partial oxidation of natural gas |
| CN105408500A (en) * | 2013-07-31 | 2016-03-16 | 米德雷克斯技术公司 | Reducing iron oxide to metallic iron using natural gas |
| CN105836707A (en) * | 2016-05-17 | 2016-08-10 | 江苏省冶金设计院有限公司 | Non-catalytic partial oxidation-reforming furnace and method for preparing synthesis gas by using same |
| CN206385192U (en) * | 2016-12-16 | 2017-08-08 | 江苏省冶金设计院有限公司 | A kind of preparation system of DRI |
-
2016
- 2016-12-16 CN CN201611168606.1A patent/CN106435081A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276133A (en) * | 2013-05-31 | 2013-09-04 | 北京神雾环境能源科技集团股份有限公司 | Method for producing direct reduction iron by utilizing partial oxidation of natural gas |
| CN105408500A (en) * | 2013-07-31 | 2016-03-16 | 米德雷克斯技术公司 | Reducing iron oxide to metallic iron using natural gas |
| CN105836707A (en) * | 2016-05-17 | 2016-08-10 | 江苏省冶金设计院有限公司 | Non-catalytic partial oxidation-reforming furnace and method for preparing synthesis gas by using same |
| CN206385192U (en) * | 2016-12-16 | 2017-08-08 | 江苏省冶金设计院有限公司 | A kind of preparation system of DRI |
Cited By (3)
| 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 |
| CN107354260A (en) * | 2017-08-31 | 2017-11-17 | 江苏省冶金设计院有限公司 | A kind of system and method that DRI is smelted using clean pyrolysis gas |
| CN111961784A (en) * | 2020-08-31 | 2020-11-20 | 山东大学 | Method and system for reduction reaction of iron ore powder in bubbling bed |
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