CN206385192U - A kind of preparation system of DRI - Google Patents
A kind of preparation system of DRI Download PDFInfo
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- CN206385192U CN206385192U CN201621390735.0U CN201621390735U CN206385192U CN 206385192 U CN206385192 U CN 206385192U CN 201621390735 U CN201621390735 U CN 201621390735U CN 206385192 U CN206385192 U CN 206385192U
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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
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- 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 discloses a kind of preparation system of DRI.The system includes：Devulcanizer, is exported with gas inlet and desulphurised natural gas；Section oxidation and reformation stove, with the also Primordial Qi outlet of the first desulphurised natural gas entrance, the second desulphurised natural gas entrance, oxygen intake and first, the first desulphurised natural gas entrance and the second desulphurised natural gas entrance are connected with desulphurised natural gas outlet respectively；Gas-based shaft kiln, with iron ore entrance, also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet, also Primordial Qi entrance is connected with the first also Primordial Qi outlet；Section oxidation and reformation stove includes partial oxidation unit and reformer, partial oxidation unit is located at the lower section of reformer, first desulphurised natural gas entrance and oxygen intake are arranged on partial oxidation unit, and the second desulphurised natural gas entrance and the first also Primordial Qi outlet are arranged on reformer.DRI degree of metalization made from the utility model is high, and production cost is low.
Description
Technical field
The utility model belongs to direct reduction processes of Iron ores field, and in particular to a kind of system of DRI.
Background technology
DRI (DRI) is also known as sponge iron, is iron ore less than being reduced directly obtained iron content under fusion temperature
Product.Sponge iron is a kind of substitute of steel scrap, is electric furnace refining clean steel, the indispensable impurity diluent of high-quality steel, is to turn
Stove makes steel the cooling agent of high-quality, is to develop the indispensable raw material of Ferrous Metallurgy short route., whole world DRI in 2014
Annual production up to 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
The major class of base method two.Wherein, 76% DRI is produced by gas base method.Gas base method using also Primordial Qi (its mainly into
It is divided into CO and H2) reducing iron ore, prepare DRI.At present, also Primordial Qi is main is made by raw material of natural gas.It is 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 solve the defect of prior art, the production cost of DRI is reduced, there is a kind of new production to be developed
The technique of DRI.
Utility model content
In view of the shortcomings of the prior art, the utility model provide firstly a kind of preparation system of DRI, described
System includes：
Devulcanizer, is exported 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 it is 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
Also Primordial Qi entrance is stated with the first also Primordial Qi outlet of the section oxidation-reformer to be 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 present utility model, the system also includes purification-heat exchanger, the 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, the High-temperature furnace 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 outlet is natural with the devulcanizer
Gas entrance is connected.
In some embodiments of the present utility model, the system also includes：
Compressor, with low temperature top gas entrance, the outlet of compression top gas, the low temperature top gas entrance with it is described net
The low temperature top gas outlet of change-heat exchanger is connected；
Decarbonizing tower, with the also Primordial Qi outlet of compression top gas entrance, second, 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 present utility model, the system also includes heating furnace, and the heating furnace has fuel gas
The also Primordial Qi entrance of entrance, second and the outlet of pre- thermal reduction gas, the low temperature furnace roof of the fuel gas entrance and the purification-heat exchanger
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 pre- thermal reduction gas
Export and be connected with the also Primordial Qi entrance of the gas-based shaft kiln.
Also Primordial Qi used in the utility model is mainly what is prepared using section oxidation-reformer.The segmented
Partial oxidation-reformer is first aoxidized with natural gas with oxygen, then the mixed gas produced with oxidation is weighed with natural gas
Whole reaction, prepares also Primordial Qi.The oxidation reaction of natural gas and oxygen is exothermic reaction, and obtained mixed gas is high-temperature gas mixture
Body, therefore, in reforming reaction, without outside heat supply, reduces production cost.
In addition, the section oxidation-reformer is simple in construction, and in use without expensive nickel-base catalyst,
Maintenance cost is low.
Secondly, the obtained also Primordial Qi quality height of the utility model, reducing power are strong, also CO and H in Primordial Qi2Content about
90% or so, and also, the content of Primordial Qi reclaimed water steam is less than 5%.
Brief description of the drawings
Fig. 1 be the utility model embodiment in a kind of DRI preparation system structural representation.
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.
The preparation system for the DRI that the utility model is provided includes：Devulcanizer, it has gas inlet and de-
Sulphur gas outlet；Section oxidation-reformer, there is the first desulphurised natural gas entrance, the second desulphurised natural gas to enter for it
Mouthful, oxygen intake and the first also Primordial Qi outlet, the first desulphurised natural gas entrance and the second desulphurised natural gas entrance respectively with desulfurization
The desulphurised natural gas outlet of device is connected；Gas-based shaft kiln, its have iron ore entrance, also Primordial Qi entrance, high temperature furnace top gas outlet and
DRI is exported, and also Primordial Qi entrance is connected with the first also Primordial Qi outlet of section oxidation-reformer.
Section oxidation-reformer that the utility model is used includes partial oxidation unit and reformer, part
Oxidation unit is located at the lower section of reformer, and the first desulphurised natural gas entrance and oxygen intake are arranged on partial oxidation unit,
Second desulphurised natural gas entrance and the first also Primordial Qi outlet are arranged on reformer.
Section oxidation-the reformer is first aoxidized with natural gas with oxygen, then the gaseous mixture produced with oxidation
Body carries out reforming reaction with natural gas, prepares also Primordial Qi.The oxidation reaction of natural gas and oxygen is exothermic reaction, obtained mixing
Gas is high-temperature gas mixture body, therefore, in reforming reaction, without outside heat supply, reduces production cost.
In addition, the section oxidation-reformer is simple in construction, and in use without 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 also the content of Primordial Qi reclaimed water steam is less than 5%.Also Primordial Qi made from said system is referred to as first in the utility model
Also Primordial Qi.
Secondly, also the reaction of Primordial Qi reducing iron ore is the endothermic reaction, and is discharged from the section oxidation-reformer
First reduction temperature degree it is higher, a part of heat can be provided for the reduction reaction of iron ore, DRI is reduced
Production cost.
In the utility model preferred embodiment, with reference to Fig. 1, said system also includes purification-heat exchanger, purifies-changes
Hot utensil has 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 entrance 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 the heat for reclaiming 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 handled the high temperature furnace top gas discharged from gas-based shaft kiln, and is returned
Heat has been received, it is not only environmentally friendly, and also heat utilization ratio is high.
In the further preferred embodiment of the utility model, with reference to Fig. 1, said system still further comprise compressor and
Decarbonizing tower.Compressor and decarbonizing tower are used to handle low temperature top gas, prepare second and go back Primordial Qi.
Compressor has low temperature top gas entrance, the outlet of compression top gas, low temperature top gas entrance and purification-heat exchanger
The outlet of low temperature top gas is connected.Decarbonizing tower has the also Primordial Qi outlet of compression top gas entrance, second, 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, remaining gas is largely CO and H2,
Available for reducing iron ore.In above-mentioned preferred embodiment, low temperature top gas is further employed, and is not only reduced directly also
The production cost of former iron, 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
The also Primordial Qi entrance of fuel gas entrance, second and the outlet of pre- thermal reduction gas, the low temperature top gas of fuel gas entrance and purification-heat exchanger
Outlet is connected, and the second also Primordial Qi entrance is connected with the second also Primordial Qi outlet of decarbonizing tower, pre- thermal reduction gas outlet and gas-based shaft kiln
Also Primordial Qi entrance be connected.
It is the same as those described above, many CO and H is contained in top gas2, in above preferred embodiment, a part of top gas is through overvoltage
Contracting and carbonization treatment, Primordial Qi is gone back for preparing second；Another part top gas is burned, and the obtained heat that burns, which is used to preheat, to be made
Second obtained also Primordial Qi, a part of heat can be provided for the reduction reaction of iron ore, the production cost of DRI is reduced.
It should be noted that the percentage composition of all gases referred to of the utility model is volume content, the hundred of gas
It is percent by volume to divide ratio.
Below with reference to specific embodiment, the utility model is illustrated.Institute's taking technique condition value in following embodiments
It is exemplary, its desirable number range is as shown in foregoing utility model content.Detection method used in following embodiments
It is the conventional detection method of the industry.
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 has iron ore entrance, also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet.
Purification-heat exchanger 2 has 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.
There is devulcanizer 3 gas inlet and desulphurised natural gas to export, 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
Sulphur 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 segmented portion i.e. shown in Fig. 1
The lower section of dotted line in point oxidation-reformer 4) and reformer (in 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 has low temperature top gas entrance, the outlet of compression top gas, low temperature top gas entrance and purification-heat exchanger 2
Low temperature top gas outlet be connected.
Decarbonizing tower 6 has the also Primordial Qi outlet of compression top gas entrance, second, the pressure of compression top gas entrance and compressor 5
The outlet of contracting top gas is connected.
Heating furnace 7 has the also Primordial Qi entrance of fuel gas entrance, second and an outlet of pre- thermal reduction gas, fuel gas entrance with it is 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 to be connected with the also Primordial Qi entrance of gas-based shaft kiln 1.
Embodiment 2
The present embodiment is specific as follows using the system production DRI described in embodiment 1：
Prepare raw material：Prepare natural gas, oxygen, iron ore.
Prepare first and go back Primordial Qi：The High-temperature furnace top pneumatic transmission discharged from gas-based shaft kiln 1 is entered in purification-heat exchanger 2 and purified, and
With heat exchange gas, high temperature furnace top gas is changed into low temperature top gas.By desulfurization in the natural gas feeding devulcanizer 3 after preheating.80%
Desulphurised natural gas be admitted to the partial oxidation unit of section oxidation-reformer 4 and the oxygen of preheating carries out part oxygen
Change reaction, mixed gas is made, reaction temperature is 1310 DEG C.Mixed gas is further fed into section oxidation-reformation
The reformer of stove 4, the desulphurised natural gas with remaining 20% carries out reforming reaction, and Primordial Qi is gone back in generation first, and first goes back Primordial Qi
Temperature be about 950 DEG C.
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 made second and goes back Primordial Qi.Will remaining 14% low temperature top gas feeding heating furnace 7 in burn, and with generation heat
Preheat second discharged from decarbonizing tower 6 and go back Primordial Qi.The temperature of the second also Primordial Qi after preheating is 880 DEG C.
Reducing iron ore：First also Primordial Qi is mixed with the second also Primordial Qi, reduction of iron ore in gas-based shaft kiln 1 is then fed into
Stone, prepares DRI.The temperature of obtained mixing also Primordial Qi is about 900 DEG C, the content of mixing also Primordial Qi reclaimed water steam
It is 34%, H for 3.9%, CO content2Content be 55%.The degree of metalization of obtained DRI is 93%.
Embodiment 3
The present embodiment is specific as follows using the system production DRI described in embodiment 1：
Prepare raw material：Prepare natural gas, oxygen, iron ore.
Prepare first and go back Primordial Qi：The High-temperature furnace top pneumatic transmission discharged from gas-based shaft kiln 1 is entered in purification-heat exchanger 2 and purified, and
With heat exchange gas, high temperature furnace top gas is changed into low temperature top gas.By desulfurization in the natural gas feeding devulcanizer 3 after preheating.84%
Desulphurised natural gas be admitted to the partial oxidation unit of section oxidation-reformer 4 and the oxygen of preheating carries out part oxygen
Change reaction, mixed gas is made, reaction temperature is 1260 DEG C.Mixed gas is further fed into section oxidation-reformation
The reformer of stove 4, the desulphurised natural gas with remaining 16% carries out reforming reaction, and Primordial Qi is gone back in generation first, and first goes back Primordial Qi
Temperature be about 940 DEG C.
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 made second and goes back Primordial Qi.Will remaining 10% low temperature top gas feeding heating furnace 7 in burn, and with generation heat
Preheat second discharged from decarbonizing tower 6 and go back Primordial Qi.The temperature of the second also Primordial Qi after preheating is 870 DEG C.
Reducing iron ore：First also Primordial Qi is mixed with the second also Primordial Qi, reduction of iron ore in gas-based shaft kiln 1 is then fed into
Stone, prepares DRI.The temperature of obtained mixing also Primordial Qi is about 900 DEG C, the content of mixing also Primordial Qi reclaimed water steam
It is 31%, H for 4%, CO content2Content be 60%.The degree of metalization of obtained DRI is 96%.
It was found from above-described embodiment, the quality of DRI made from the technique provided using the utility model is high, and
Production cost is low.
To sum up, the also Primordial Qi used in the utility model is mainly what is prepared using section oxidation-reformer.This point
Segmented portions oxidation-reformer is first aoxidized with natural gas with oxygen, then the mixed gas produced with oxidation is entered with natural gas
Row reforming reaction, prepares also Primordial Qi.The oxidation reaction of natural gas and oxygen is exothermic reaction, and obtained mixed gas is mixed for high temperature
Gas is closed, therefore, in reforming reaction, without outside heat supply, production cost is reduced.
In addition, the section oxidation-reformer is simple in construction, and in use without expensive nickel-base catalyst,
Maintenance cost is low.
Secondly, the obtained also Primordial Qi quality height of the utility model, reducing power are strong, also CO and H in Primordial Qi2Content about
90% or so, and also, the content of Primordial Qi reclaimed water steam is less than 5%.
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 (4)
1. a kind of preparation system of DRI, it is characterised in that the system includes：
Devulcanizer, is exported 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, it is described to go back with iron ore entrance, also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet
Primordial Qi entrance is connected with the first also Primordial Qi outlet of the section oxidation-reformer；
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, the high-temperature natural gas outlet 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, the outlet of compression top gas, the low temperature top gas entrance is purified-changed with described
The low temperature top gas outlet of hot device is connected；
Decarbonizing tower, with the also Primordial Qi outlet of compression top gas entrance, second, the compression top gas entrance and the compressor
Compress top gas outlet to be connected, 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, the heating furnace has
The also Primordial Qi entrance of fuel gas entrance, second and the outlet of pre- thermal reduction gas, the fuel gas entrance are 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.
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| CN201621390735.0U CN206385192U (en) | 2016-12-16 | 2016-12-16 | A kind of preparation system of DRI |
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| CN201621390735.0U CN206385192U (en) | 2016-12-16 | 2016-12-16 | A kind of preparation system of DRI |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106435081A (en) * | 2016-12-16 | 2017-02-22 | 江苏省冶金设计院有限公司 | Preparation system of direct reduction iron and preparation method |
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2016
- 2016-12-16 CN CN201621390735.0U patent/CN206385192U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106435081A (en) * | 2016-12-16 | 2017-02-22 | 江苏省冶金设计院有限公司 | Preparation system of direct reduction iron and preparation method |
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