CN106399617A - Direct reduced iron making system and method for gas-based shaft furnace - Google Patents
Direct reduced iron making system and method for gas-based shaft furnace Download PDFInfo
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- CN106399617A CN106399617A CN201611168224.9A CN201611168224A CN106399617A CN 106399617 A CN106399617 A CN 106399617A CN 201611168224 A CN201611168224 A CN 201611168224A CN 106399617 A CN106399617 A CN 106399617A
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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
- Y02P10/20—Recycling
Abstract
The invention discloses a direct reduced iron making system and method for a gas-based shaft furnace. The system comprises the gas-based shaft furnace, a washer, a compressor, an inverse transformation furnace, an indirect cooler and a heating furnace. The washer is connected to the gas-based shaft furnace and the compressor, respectively; the inverse transformation furnace is connected to the compressor and the indirect cooler, respectively; and the heating furnace is connected to the indirect cooler and the gas-based shaft furnace, respectively. By taking top gas as a raw material to prepare reducing gas for direct reduction iron, and the cyclic utilization rate of the top gas reaches up to 80% above. Therefore, the raw material is saved, and the energy consumption of the system is reduced, so that the production cost of direct reduced iron is lowered. The quality of the direct reduced iron is high, and the production cost is low.
Description
Technical field
The invention belongs to direct reduction processes of Iron ores field is and in particular to a kind of system of gas-based shaft kiln directly reduced ironmaking
And method.
Background technology
DRI (DRI), also known as sponge iron, is that iron ore is reduced directly, under less than fusion temperature, the iron content obtaining
Product.Sponge iron is a kind of succedaneum of steel scrap, is electric furnace refining clean steel, high-quality steel indispensable impurity diluent, is to turn
The coolant of high-quality made steel by stove, is the indispensable raw material of development Ferrous Metallurgy short route.
The technique producing DRI is referred to as direct-reduction process, belongs to non-blast furnace ironmaking technique, is divided into gas base method and coal
Base method two big class.Wherein, 76% DRI is to be produced by gas base method.Using also Primordial Qi, (it 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 for raw material, its preparation
Cost is very high.
Content of the invention
It is an object of the invention to provide a kind of new technology of gas-based shaft kiln directly reduced ironmaking, reduce the life of DRI
Produce cost.
Present invention firstly provides a kind of system of gas-based shaft kiln directly reduced ironmaking, described system includes：
Gas-based shaft kiln, has oxidation material entrance, also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet；
Scrubber, has high temperature furnace top gas entrance and purifies top gas outlet, described high temperature furnace top gas entrance and described gas
The high temperature furnace top gas outlet of base shaft furnace is connected；
Compressor, has purification top gas entrance and compression top gas outlet, and described purification top gas entrance is washed with described
The purification top gas outlet washing device is connected；
Inverse transformation stove, has H2Entrance, CO2Entrance, fuel gas entrance, compression top gas entrance, high-temperature gas mixture body go out
Mouthful, described compression top gas entrance is connected with the compression top gas outlet of described compressor；
Inter cooler, have mixed gas entrance, low-temperature reduction gas outlet and water out, described mixed gas entrance with described
The high-temperature gas mixture body outlet of inverse transformation stove is connected；
Heating furnace, has low-temperature reduction gas entrance, fuel gas entrance and the outlet of high temperature reduction gas, and described low-temperature reduction gas enters
Mouth is connected with the low-temperature reduction gas outlet of described inter cooler, and described high temperature reduction gas outlet is entered with the also Primordial Qi of described gas-based shaft kiln
Mouth is connected.
In some embodiments of the invention, described system also includes heat exchanger, and described heat exchanger has low temperature H2Entrance,
Low temperature CO2Entrance, low temperature compression top gas entrance, high-temperature gas mixture body entrance, preheating H2Outlet, preheating CO2Outlet, pre- hot pressing
The outlet of contracting top gas and low-temperature mixed gas outlet, the compression top gas of described low temperature compression top gas entrance and described compressor
Outlet is connected, and described high-temperature gas mixture body entrance is connected with the high-temperature gas mixture body outlet of described inverse transformation stove, described preheating H2
Outlet and the H of described inverse transformation stove2Entrance is connected, described preheating CO2Outlet and the CO of described inverse transformation stove2Entrance is connected, described
The outlet of pre- hot compression top gas is connected with the compression top gas entrance of described inverse transformation stove, described low-temperature mixed gas outlet and institute
The mixed gas outlet stating inter cooler is connected.
In some embodiments of the invention, the top gas that purifies of described scrubber exports the combustion also with described inverse transformation stove
The fuel gas entrance of material gas entrance and/or described heating furnace is connected
Additionally, present invention also offers a kind of method preparing DRI using said system, methods described includes
Following steps：
Prepare oxidation material, CO2And H2；
The High-temperature furnace top pneumatic transmission discharged from described gas-based shaft kiln is entered dedusting and dehydration in described scrubber, obtains and purify
Top gas；
Described purification top gas is sent in described compressor and is compressed, obtain compression top gas；
By described compression top gas, described CO2With described H2Send in described inverse transformation stove, anti-in the presence of catalyst
High-temperature gas mixture body should be generated；
Described high-temperature gas mixture body is sent in described inter cooler and cools down, remove vapor therein, obtain low-temperature reduction
Gas；
Described low-temperature reduction pneumatic transmission is entered in described heating furnace to be heated, obtains high temperature reduction gas；
Described high temperature reduction pneumatic transmission is entered in described gas-based shaft kiln, for reducing described oxidation material, obtains direct-reduction
Ferrum.
In some embodiments of the invention, by described high-temperature gas mixture body and described compression top gas and described H2Change
Heat, reclaims the heat of described high-temperature gas mixture body.
In some embodiments of the invention, described H2, described CO2Volume ratio with described compression top gas is 25-40:
0.1-10:50-75.
In some embodiments of the invention, described catalyst is copper-based catalysts or ferrum-based catalyst.
In some embodiments of the invention, in described inverse transformation stove, described compression top gas, described CO2With described H2
Reaction temperature be 500 DEG C -700 DEG C.
In some embodiments of the invention, the described purification top gas of 5%-20% is described inverse as fuel gas feeding
Burnt in change furnace and/or described heating furnace, heat is provided；The described purification top gas of remaining 80%-95% is sent
Enter in described compressor and be compressed.
The present invention adopts top gas as raw material, prepares DRI also Primordial Qi, and the cyclic utilization rate of top gas is high
Reach more than 80%.Not only save raw material, also reduced system energy consumption, thus reducing the production cost of DRI.
Secondly, the present invention adopts inverse transformation stove preparation also Primordial Qi, and inverse transformation stove used only need to load cheap catalyst and be
The also Primordial Qi of high-quality can be obtained.The reducing power of the also Primordial Qi that the present invention is obtained is strong, also CO and H in Primordial Qi2Content be higher than
85%, and go back the content of vapor in Primordial Qi less than 5%；The quality of the DRI being obtained by it is high.Additionally, whole technique
Only a small amount of CO2Discharge, environmentally friendly.
The present invention can be used for industrial production device, particularly big-and-middle-sized commerical test device.
Brief description
Fig. 1 is the structural representation of one of the embodiment of the present invention system of gas-based shaft kiln directly reduced ironmaking；
Fig. 2 is one of embodiment of the present invention using the above-mentioned process chart preparing DRI.
Specific embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in more details, so that energy
The advantage enough more fully understanding the solution of the present invention and its various aspects.However, specific embodiments described below and reality
Applying example is only descriptive purpose, rather than limitation of the present invention.
The system of the gas-based shaft kiln directly reduced ironmaking that the present invention provides includes：Gas-based shaft kiln, have oxidation material entrance,
Also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet；Scrubber, has high temperature furnace top gas entrance and purifies furnace roof
Gas exports, and high temperature furnace top gas entrance is connected with the high temperature furnace top gas outlet of gas-based shaft kiln；Compressor, has purification top gas entrance
With compression top gas outlet, purify top gas entrance and be connected with the purification top gas outlet of scrubber；Inverse transformation stove, has H2Enter
Mouth, CO2Entrance, fuel gas entrance, compression top gas entrance, the outlet of high-temperature gas mixture body, compression top gas entrance and compressor
Compression top gas outlet be connected；Inter cooler, has mixed gas entrance, the outlet of low-temperature reduction gas and water out, mixed gas
Entrance is connected with the high-temperature gas mixture body outlet of inverse transformation stove；Heating furnace, has low-temperature reduction gas entrance, fuel gas entrance and height
Temperature also Primordial Qi outlet, low-temperature reduction gas entrance is connected with the low-temperature reduction gas outlet of inter cooler, and high temperature reduction gas exports and gas base
The also Primordial Qi entrance of shaft furnace is connected.
The main component of the top gas discharged from gas-based shaft kiln is CO, CO2And H2, after purification and compression, in top gas
CO2The H separately being added in inverse transformation stove2It is reduced to CO, acquisition main component is CO and H2High-temperature gas mixture body, then remove
Remove vapor in this high-temperature gas mixture body, that is, obtain reducing gas.
Additionally, inverse transformation stove used only need to load the also Primordial Qi that cheap catalyst can obtain high-quality.System of the present invention
The reducing power of the also Primordial Qi obtaining is strong, also CO and H in Primordial Qi2Content be higher than 85%, and also in Primordial Qi vapor content low
In 5%；The quality of the DRI being obtained by it is high.Additionally, whole technique only has a small amount of CO2Discharge, environmentally friendly.
In the preferred embodiment of the invention, with reference to Fig. 1, said system also includes heat exchanger, and heat exchanger has low temperature H2
Entrance, low temperature CO2Entrance, low temperature compression top gas entrance, high-temperature gas mixture body entrance, preheating H2Outlet, preheating CO2Outlet, pre-
The outlet of hot compression top gas and low-temperature mixed gas outlet, low temperature compression top gas entrance is exported with the compression top gas of compressor
It is connected, high-temperature gas mixture body entrance is connected with the high-temperature gas mixture body outlet of inverse transformation stove, preheats H2Outlet and the H of inverse transformation stove2
Entrance is connected, and the outlet of pre- hot compression top gas is connected with the compression top gas entrance of inverse transformation stove, low-temperature mixed gas outlet and
The mixed gas outlet of inter cooler is connected.
Wherein, heat exchanger is used for reclaiming the heat of the high-temperature gas mixture body that inverse transformation stove is obtained, and the heat of recovery is used for
Preheating enters the material of inverse transformation stove, and heat utilization ratio is high.
In the further preferred embodiment of the present invention, with reference to Fig. 1, the purification top gas outlet of scrubber is gone back and inverse transformation
The fuel gas entrance of the fuel gas entrance of stove and/or heating furnace is connected.
It is the same as those described above, in top gas, contain many CO and H2, in above preferred embodiment, a part of top gas is through overvoltage
Contracting and inversion process, for preparation also Primordial Qi；Another part top gas is burned, and provides heat and preheating for reverse shift reaction
Enter the also Primordial Qi of gas-based shaft kiln, reduce the production cost of DRI.
The cyclic utilization rate of top gas up to more than 80% in the present invention.Not only save raw material, also reduce system energy
Consumption, thus reduce the production cost of DRI.
Invention further provides a kind of method preparing DRI using said system, the method includes as follows
Step：
Prepare oxidation material, CO2And H2；
The High-temperature furnace top pneumatic transmission discharged from gas-based shaft kiln is entered dedusting and dehydration in scrubber, obtains and purify top gas；
It is compressed purifying in top gas feeding compressor, obtain compression top gas；
Top gas, CO will be compressed2And H2Send in inverse transformation stove, reaction in the presence of catalyst generates high-temperature gas mixture
Body；
High-temperature gas mixture body is sent in inter cooler and cools down, remove vapor therein, obtain low-temperature reduction gas；
Low-temperature reduction pneumatic transmission is entered in heating furnace to be heated, obtains high temperature reduction gas；
High temperature reduction pneumatic transmission is entered in gas-based shaft kiln, for reduction-oxidation material, obtains DRI.
It is the same as those described above, can be by high-temperature gas mixture body and compression top gas, CO2And H2Heat exchange, reclaims the heat of high-temperature gas mixture body
Amount.
After many experiments find, are stable, H2、CO2Volume ratio with compression top gas is 25-40:0.1-10:
50-75, the quality of prepared also Primordial Qi is higher.At the blow-on initial stage, required H2And CO2Relatively more, stable after, can reduce
H2And CO2Addition.
It is the same as those described above, inverse transformation stove used only need to load the also Primordial Qi that cheap catalyst can obtain high-quality.At this
In invention preferred embodiment, catalyst is copper-based catalysts or ferrum-based catalyst, and it is cheap, and excellent catalytic effect.
The material of inverse transformation stove in the preferred embodiment of the invention, is entered due to employing the preheating of high-temperature gas mixture body,
Therefore, the material heat required when carrying out reverse shift reaction is without too many.Find through many experiments, in above-mentioned preferred reality
Apply in example, at a temperature of 500 DEG C -700 DEG C, reverse shift reaction can react must be than more thoroughly.
It is the same as those described above, the part purifying in top gas discharged from scrubber can be sent into inverse transformation stove and/or feeding
Use as fuel in heating furnace, for these equipment heat supplies.Find, the purification top gas of 5%-20% can through many experiments
Meet the needs of system thermal.
It should be noted that the beneficial effect of each device and above-mentioned prepare DRI using this 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 having the gas 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 conventional detection method of industry.
Embodiment 1
The present embodiment provides a kind of system of gas-based shaft kiln directly reduced ironmaking, and Fig. 1 is its structural representation.
As shown in figure 1, this system includes：Gas-based shaft kiln 1, scrubber 2, compressor 3, heat exchanger 4, inverse transformation stove 5, cold
Device 6 and heating furnace 7.
Gas-based shaft kiln 1 has oxidation material entrance, also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet.
Scrubber 2 has high temperature furnace top gas entrance and purification top gas outlet, high temperature furnace top gas entrance and gas-based shaft kiln
The outlet of high temperature furnace top gas is connected.
Compressor 3 has purification top gas entrance and compression top gas outlet, and purification top gas entrance is net with scrubber
Change top gas outlet to be connected.
Heat exchanger 4 has low temperature H2Entrance, low temperature CO2Entrance, low temperature compression top gas entrance, high-temperature gas mixture body entrance,
Preheating material outlet and low-temperature mixed gas outlet, low temperature compression top gas entrance exports phase with the compression top gas of compressor 3
Even.The present embodiment is by above-mentioned preheating H2Outlet, preheating CO2Outlet and the outlet of pre- hot compression top gas connect, and form a preheating thing
Material outlet, decreases the pipeline in system.
Inverse transformation stove 5 have preheating material entrance, fuel gas entrance and high-temperature gas mixture body outlet, preheating material entrance with
The preheating material outlet of heat exchanger 4 is connected, and fuel gas entrance is connected with the purification top gas outlet of scrubber 2.Due in heat exchange
In device 4, preheat H2, preheating CO2It is re-fed in inverse transformation stove 5 with after the mixing of pre- hot compression top gas, therefore, in the present embodiment
Inverse transformation stove 5 is also only provided with a preheating material entrance, and it acts on and H mentioned hereinabove2Entrance, CO2Entrance and compression stove
The effect of top gas entrance is identical.
Inter cooler 6 has mixed gas entrance, the outlet of low-temperature reduction gas and water out, mixed gas entrance and inverse transformation stove
5 high-temperature gas mixture body outlet is connected.
Heating furnace 7 have low-temperature reduction gas entrance, fuel gas entrance and high temperature reduction gas outlet, low-temperature reduction gas entrance with
The low-temperature reduction gas outlet of inter cooler 6 is connected, and fuel gas entrance is connected with the purification top gas outlet of scrubber 2, high temperature reduction
Gas is exported and is connected with the also Primordial Qi entrance of gas-based shaft kiln 1.
Embodiment 2
The present embodiment provides a kind of method preparing DRI using the system described in embodiment 1, its technological process
As shown in Fig. 2 it is specific as follows：
Prepare raw material：Full Iron grade is 62% acid pellet, H2And CO2, H2And CO2Purity be 95%, remaining composition
For N2.
Preparation also Primordial Qi：
1) the High-temperature furnace top pneumatic transmission discharged from gas-based shaft kiln 1 is entered dedusting and dehydration in scrubber 2, obtain and purify furnace roof
Gas.
2) 80% purification top gas is sent in compressor 3 and be compressed, obtain compression top gas.Top gas will be compressed
Send in heat exchanger 4, then be charged with H2And CO2, obtain compression top gas, the H of preheating2And CO2Gaseous mixture, after preheating
Gaseous mixture temperature be about 550 DEG C.Gaseous mixture after preheating is sent in inverse transformation stove 5, carries out reverse shift reaction, obtain high
Warm mixed gas, high-temperature gas mixture body is sent back to pre- hot compression top gas, H in heat exchanger 4 again2And CO2, cold between being then re-fed into
In device 6, remove vapor therein, obtain low-temperature reduction gas.Low-temperature reduction pneumatic transmission is entered to be heated to about 920 DEG C in heating furnace 7,
Obtain high temperature reduction gas.
During just blow-on, send into the H in heat exchanger 42、CO2Volume ratio be 90:10；After running 10h, send in heat exchanger 4
H2、CO2Volume ratio with compression top gas is 40:10:50.Fuel gas used by inverse transformation stove 5 and heating furnace 7 is remaining
20% purification top gas.Catalyst used by inverse transformation stove is copper-based catalysts, and the temperature of reverse shift reaction is 700 DEG C.System
H in the high temperature reduction gas obtaining2O and CO2Content is respectively 2.3% and 3.4%, H2Content be 57.1%, CO content be
36.8%.
Reducing iron ore：High temperature reduction pneumatic transmission is entered to reduce above-mentioned acid pellet in gas-based shaft kiln 1, preparation direct-reduction
Ferrum.The degree of metalization of prepared DRI is 92%.
Embodiment 3
The present embodiment provides a kind of method preparing DRI using the system described in embodiment 1, its technological process
As shown in Fig. 2 it is specific as follows：
Prepare raw material：Full Iron grade is 65% acid pellet, H2And CO2, H2And CO2Purity be 96%, remaining composition
For N2.
Preparation also Primordial Qi：
1) the High-temperature furnace top pneumatic transmission discharged from gas-based shaft kiln 1 is entered dedusting and dehydration in scrubber 2, obtain and purify furnace roof
Gas.
2) 95% purification top gas is sent in compressor 3 and be compressed, obtain compression top gas.Top gas will be compressed
Send in heat exchanger 4, then be charged with H2And CO2, obtain compression top gas, the H of preheating2And CO2Gaseous mixture, after preheating
Gaseous mixture temperature be about 620 DEG C.Gaseous mixture after preheating is sent in inverse transformation stove 5, carries out reverse shift reaction, obtain high
Warm mixed gas, high-temperature gas mixture body is sent back to pre- hot compression top gas, H in heat exchanger 4 again2And CO2, cold between being then re-fed into
In device 6, remove vapor therein, obtain low-temperature reduction gas.Low-temperature reduction pneumatic transmission is entered to be heated to about 920 DEG C in heating furnace 7,
Obtain high temperature reduction gas.
During just blow-on, send into the H in heat exchanger 42、CO2Volume ratio be 80:20；After running 10h, send in heat exchanger 4
H2、CO2Volume ratio with compression top gas is 25:0.1:74.9.Fuel gas used by inverse transformation stove 5 and heating furnace 7 is remaining
5% purification top gas.Catalyst used by inverse transformation stove is ferrum-based catalyst, and the temperature of reverse shift reaction is 500 DEG C.System
H in the high temperature reduction gas obtaining2O and CO2Content is respectively 2.3% and 3.1%, H2Content be 60.8%, CO content be
33.2%.
Reducing iron ore：High temperature reduction pneumatic transmission is entered to reduce above-mentioned acid pellet in gas-based shaft kiln 1, preparation direct-reduction
Ferrum.The degree of metalization of prepared DRI is 93%.
Knowable to above-described embodiment, the quality of the DRI being obtained using the technique that the present invention provides is high, and produces
Low cost.
To sum up, the present invention adopts top gas as raw material, prepares DRI also Primordial Qi, the recycling of top gas
Rate up to more than 80%.Not only save raw material, also reduced system energy consumption, thus the production reducing DRI becomes
This.
Secondly, the present invention adopts inverse transformation stove preparation also Primordial Qi, and inverse transformation stove used only need to load cheap catalyst and be
The also Primordial Qi of high-quality can be obtained.The reducing power of the also Primordial Qi that the present invention is obtained is strong, also CO and H in Primordial Qi2Content be higher than
85%, and go back the content of vapor in Primordial Qi less than 5%；The quality of the DRI being obtained by it is high.Additionally, whole technique
Only a small amount of CO2Discharge, environmentally friendly.
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 that Shen goes out or change among still in protection scope of the present invention.
Claims (9)
1. a kind of system of gas-based shaft kiln directly reduced ironmaking is it is characterised in that described system includes：
Gas-based shaft kiln, has oxidation material entrance, also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet；
Scrubber, has high temperature furnace top gas entrance and purifies top gas outlet, described high temperature furnace top gas entrance is erected with described gas base
The high temperature furnace top gas outlet of stove is connected；
Compressor, has purification top gas entrance and compression top gas outlet, described purification top gas entrance and described scrubber
Purification top gas outlet be connected；
Inverse transformation stove, has H2Entrance, CO2Entrance, fuel gas entrance, compression top gas entrance, the outlet of high-temperature gas mixture body, institute
State compression top gas entrance to be connected with the compression top gas outlet of described compressor；
Inter cooler, has mixed gas entrance, the outlet of low-temperature reduction gas and water out, described mixed gas entrance and described inversion
The high-temperature gas mixture body outlet changing stove is connected；
Heating furnace, have low-temperature reduction gas entrance, fuel gas entrance and high temperature reduction gas outlet, described low-temperature reduction gas entrance with
The low-temperature reduction gas outlet of described inter cooler is connected, and described high temperature reduction gas outlet goes back Primordial Qi entrance phase with described gas-based shaft kiln
Even.
2. it is characterised in that described system also includes heat exchanger, described heat exchanger has system according to claim 1
Low temperature H2Entrance, low temperature CO2Entrance, low temperature compression top gas entrance, high-temperature gas mixture body entrance, preheating H2Outlet, preheating CO2
Outlet, the outlet of pre- hot compression top gas and low-temperature mixed gas outlet, described low temperature compression top gas entrance and described compressor
The outlet of compression top gas be connected, the high-temperature gas mixture body outlet phase of described high-temperature gas mixture body entrance and described inverse transformation stove
Even, described preheating H2Outlet and the H of described inverse transformation stove2Entrance is connected, described preheating CO2Outlet and the CO of described inverse transformation stove2
Entrance is connected, and described pre- hot compression top gas outlet is connected with the compression top gas entrance of described inverse transformation stove, and described low temperature mixes
Close gas outlet to be connected with the mixed gas outlet of described inter cooler.
3. system according to claim 1 is it is characterised in that the purification top gas outlet of described scrubber is also inverse with described
The fuel gas entrance of the fuel gas entrance of change furnace and/or described heating furnace is connected.
4. a kind of prepare the method for DRI it is characterised in that described side using described system arbitrary in claim 1-3
Method comprises the steps：
Prepare oxidation material, CO2And H2；
The High-temperature furnace top pneumatic transmission discharged from described gas-based shaft kiln is entered dedusting and dehydration in described scrubber, obtains and purify furnace roof
Gas；
Described purification top gas is sent in described compressor and is compressed, obtain compression top gas；
By described compression top gas, described CO2With described H2Send in described inverse transformation stove, reaction life in the presence of catalyst
Become high-temperature gas mixture body；
Described high-temperature gas mixture body is sent in described inter cooler and cools down, remove vapor therein, obtain low-temperature reduction gas；
Described low-temperature reduction pneumatic transmission is entered in described heating furnace to be heated, obtains high temperature reduction gas；
Described high temperature reduction pneumatic transmission is entered in described gas-based shaft kiln, for reducing described oxidation material, obtains DRI.
5. system according to claim 4, its feature is being, by described high-temperature gas mixture body and described compression furnace roof
Gas, described CO2With described H2Heat exchange, reclaims the heat of described high-temperature gas mixture body.
6. method according to claim 4 is it is characterised in that described H2, described CO2Volume with described compression top gas
Than for 25-40:0.1-10:50-75.
7. method according to claim 4 is it is characterised in that described catalyst is copper-based catalysts or ferrum-based catalyst.
8. method according to claim 7 is it is characterised in that in described inverse transformation stove, described compression top gas, described
CO2With described H2Reaction temperature be 500 DEG C -700 DEG C.
9. method according to claim 4 is it is characterised in that using the described purification top gas of 5%-20% as fuel gas
Send in described inverse transformation stove and/or described heating furnace and burnt, heat is provided；Remaining 80%-95% is described net
Change in the top gas described compressor of feeding and be compressed.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114774611A (en) * | 2022-03-31 | 2022-07-22 | 中晋冶金科技有限公司 | Hydrogen rich gas CO2Method for producing iron by oxidation conversion and hydrogen-based shaft furnace direct reduction |
| CN114807486A (en) * | 2022-03-31 | 2022-07-29 | 中晋冶金科技有限公司 | CO (carbon monoxide) 2 Oxidative coupling of CH 4 Method and device for converting hydrogen production base shaft furnace reducing gas |
| WO2024048423A1 (en) * | 2022-08-30 | 2024-03-07 | Ｊｆｅミネラル株式会社 | Circulating reduction system, iron ore reduction method, and blast furnace operation method |
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| WO2024048423A1 (en) * | 2022-08-30 | 2024-03-07 | Ｊｆｅミネラル株式会社 | Circulating reduction system, iron ore reduction method, and blast furnace operation method |
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