CN206467265U - The system that a kind of utilization top gas prepares DRI - Google Patents
The system that a kind of utilization top gas prepares DRI Download PDFInfo
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- CN206467265U CN206467265U CN201621390732.7U CN201621390732U CN206467265U CN 206467265 U CN206467265 U CN 206467265U CN 201621390732 U CN201621390732 U CN 201621390732U CN 206467265 U CN206467265 U CN 206467265U
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Abstract
The utility model discloses the system that a kind of utilization top gas prepares DRI.It includes：Gas-based shaft kiln, with oxidation material entrance, also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet；Washer, with high temperature furnace top gas entrance and the outlet of purification top gas, high temperature furnace top gas entrance is connected with the outlet of high temperature furnace top gas；Compressor, with purification top gas entrance and the outlet of compression top gas, purification top gas entrance is connected with the outlet of purification top gas；Nitrogen removing device, with compression top gas entrance, clean gas outlet and rich nitrogen outlet, compression top gas entrance is connected with the outlet of compression top gas；Desulfurization and decarburization tower, with purified gas entrance, first also Primordial Qi outlet and CO2Outlet, purified gas entrance is connected with clean gas outlet；Heating furnace, is exported with low-temperature reduction gas entrance and high temperature reduction gas, and low-temperature reduction gas entrance is connected with the first also Primordial Qi outlet, and the outlet of high temperature reduction gas is connected with also Primordial Qi entrance.Gained DRI quality is high.
Description
Technical field
The utility model belongs to direct reduction processes of Iron ores field, and in particular to one kind prepares direct-reduction using top gas
The system of iron.
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.
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, and it is prepared
Cost is very high.
Utility model content
The purpose of this utility model is to provide the new technology that a kind of utilization top gas prepares DRI, and reduction is directly also
The production cost of former iron.
The utility model provides the system that a kind of utilization top gas prepares DRI, and the system includes：
Gas-based shaft kiln, with oxidation material entrance, also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet；
Washer, with high temperature furnace top gas entrance and the outlet of purification top gas, the high temperature furnace top gas entrance and the gas
The high temperature furnace top gas outlet of base shaft furnace is connected；
Compressor, with purification top gas entrance and the outlet of compression top gas, the purification top gas entrance is washed with described
The purification top gas outlet for washing device is connected；
Nitrogen removing device, with compression top gas entrance, clean gas outlet and rich nitrogen outlet, the compression top gas entrance
It is connected with the compression top gas outlet of the compressor；
Desulfurization and decarburization tower, with purified gas entrance, first also Primordial Qi outlet and CO2Outlet, the purified gas entrance and institute
The clean gas outlet for stating nitrogen removing device is connected；
Heating furnace, is exported with low-temperature reduction gas entrance and high temperature reduction gas, and the low-temperature reduction gas entrance takes off with described
The also Primordial Qi outlet of the first of sulphur decarbonizing tower is connected, the high temperature reduction gas outlet and the also Primordial Qi entrance phase of the gas-based shaft kiln
Even.
In some embodiments of the present utility model, the system also includes：
Inverse transformation stove, with H2Entrance, fuel gas entrance, the first CO2Entrance, the 2nd CO2Entrance and high-temperature gas mixture body go out
Mouthful, the first CO2The CO of entrance and the desulfurization and decarburization tower2Outlet is connected；
Inter cooler, with mixed gas entrance, second also Primordial Qi outlet and water out, the mixed gas entrance with it is described
The high-temperature gas mixture body outlet of inverse transformation stove is connected, the described second also Primordial Qi outlet and the low-temperature reduction gas entrance of the heating furnace
It is connected.
In some embodiments of the present utility model, the system also includes heat exchanger, and the heat exchanger has low temperature H2
Entrance, the first low temperature CO2Entrance, the second low temperature CO2Entrance, high-temperature gas mixture body entrance, preheating H2Outlet, the first preheating CO2Go out
Mouth, the second preheating CO2Outlet and low-temperature mixed gas vent, the first low temperature CO2The CO of entrance and the desulfurization and decarburization tower2
Outlet is connected, and the high-temperature gas mixture body entrance is connected with the high-temperature gas mixture body outlet of the inverse transformation stove, the preheating H2
Outlet and the H of the inverse transformation stove2Entrance is connected, the first preheating CO2Outlet and the first CO of the inverse transformation stove2Entrance
It is connected, the second preheating CO2Outlet and the 2nd CO of the inverse transformation stove2Entrance be connected, the low-temperature mixed gas vent with
The mixed gas outlet of the inter cooler is connected.
The utility model prepares also Primordial Qi using inverse transformation stove, and inverse transformation stove used need to only load cheap catalyst
The also Primordial Qi of high-quality is obtained, investment had both been reduced, energy consumption is reduced again.The reducing power of the obtained also Primordial Qi of the utility model
By force, CO and H also in Primordial Qi2Content be higher than 85%, and also Primordial Qi reclaimed water steam content be less than 5%；It is obtained directly by it
The quality of reduced iron is high.
The utility model, as raw material, prepares DRI also Primordial Qi using top gas, and top gas is recycled
Rate is more than 100%.Raw material has not only been saved, system energy consumption is also reduced, so as to reduce the production cost of DRI.
In addition, top gas of the present utility model recycling after desulfurization and decarburization is handled, therefore the utility model is carried
The technique of confession can be used for reducing high oxysulfide pelletizing.
The utility model can be used for industrial production device, particularly big-and-middle-sized commerical test device.
Brief description of the drawings
Fig. 1 prepares the structural representation of the system of DRI for a kind of utilization top gas in the utility model embodiment
Figure.
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 system for the use gas base method production DRI that the utility model is provided includes：Gas-based shaft kiln, with oxidation
Material inlet, also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet；Washer, with high temperature furnace top gas entrance
With the outlet of purification top gas, high temperature furnace top gas entrance is connected with the high temperature furnace top gas outlet of gas-based shaft kiln；Compressor, with purification
Top gas entrance and the outlet of compression top gas, purification top gas entrance are connected with the purification top gas outlet of washer；Denitrogenate dress
Put, with compression top gas entrance, clean gas outlet and rich nitrogen outlet, the compression furnace roof of compression top gas entrance and compressor
Gas outlet is connected；Desulfurization and decarburization tower, with purified gas entrance, first also Primordial Qi outlet and CO2Outlet, purified gas entrance is with denitrogenating
The clean gas outlet of device is connected；Heating furnace, is exported, low-temperature reduction gas entrance with low-temperature reduction gas entrance and high temperature reduction gas
It is connected with the first also Primordial Qi outlet of desulfurization and decarburization tower, high temperature reduction gas is exported to be connected with the also Primordial Qi entrance of gas-based shaft kiln.
The main component for the top gas discharged from gas-based shaft kiln is CO, CO2And H2, wherein, CO and H2Total content be even more high
Up to 70%.By purifying, denitrogenating with after desulfurization and decarburization processing, that is, also Primordial Qi is made, in the utility model, Primordial Qi should be gone back and claimed
Primordial Qi is gone back for first.
The utility model, as raw material, prepares DRI also Primordial Qi using top gas, and top gas is recycled
Rate is more than 100%.Raw material has not only been saved, system energy consumption is also reduced, so as to reduce the production cost of DRI.
Secondly, the utility model prepares also Primordial Qi using inverse transformation stove, and inverse transformation stove used need to only load inexpensive catalyzed
Agent can obtain the also Primordial Qi of high-quality, both reduced investment, energy consumption is reduced again.The utility model is obtained to go back going back for Primordial Qi
Proper energy power is strong, also CO and H in Primordial Qi2Content be higher than 85%, and also Primordial Qi reclaimed water steam content be less than 5%；It is made by it
DRI quality it is high.
In addition, top gas of the present utility model recycling after desulfurization and decarburization is handled, therefore the utility model is carried
The technique of confession can be used for reducing high oxysulfide pelletizing.
In the utility model preferred embodiment, with reference to Fig. 1, said system, which also includes system, also to be included：Inverse transformation stove
And inter cooler.
Inverse transformation stove has H2Entrance, fuel gas entrance, the first CO2Entrance, the 2nd CO2Entrance and high-temperature gas mixture body go out
Mouthful, the first CO2The CO of entrance and desulfurization and decarburization tower2Outlet is connected.
Inter cooler has mixed gas entrance, second also Primordial Qi outlet and water out, mixed gas entrance and inverse transformation stove
High-temperature gas mixture body outlet be connected, second also Primordial Qi outlet is connected with the low-temperature reduction gas entrance of heating furnace.
In above-mentioned preferred embodiment, the CO discharged from desulfurization and decarburization tower2Further with H2Reacted, prepare CO, obtain
It is CO and H to obtain main component2High-temperature gas mixture body, this high-temperature gas mixture body is cooled down, vapor therein is removed, obtained
Also Primordial Qi, in the utility model, is referred to as the second also Primordial Qi by the also Primordial Qi.
In above-mentioned preferred embodiment, in initial reaction stage, top gas is discharged from gas-based shaft kiln seldom, therefore it contains
CO2Amount be also not enough to use for gas-based shaft kiln, therefore add the new CO more than comparison2, the utility model is made by top gas
CO2Referred to as first goes back Primordial Qi, by the new CO of addition2Referred to as second goes back Primordial Qi.
In above preferred embodiment, using the CO in top gas2Further prepare second and go back Primordial Qi, not only increase production
The economic value of product, reduces system energy consumption, and whole technique only has a small amount of CO2Discharge, it is environmentally friendly.
In the utility model preferred embodiment, with reference to Fig. 1, said system also includes heat exchanger, and heat exchanger has low
Warm H2Entrance, the first low temperature CO2Entrance, the second low temperature CO2Entrance, high-temperature gas mixture body entrance, preheating H2Outlet, the first preheating
CO2Outlet, the second preheating CO2Outlet and low-temperature mixed gas vent, the first low temperature CO2The CO of entrance and desulfurization and decarburization tower2Outlet
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, the first preheating CO2Outlet and the first CO of inverse transformation stove2Entrance is connected, the second preheating CO2Outlet and inverse transformation stove
The 2nd CO2Entrance is connected, and low-temperature mixed gas vent is connected with the mixed gas outlet of inter cooler.
Wherein, heat exchanger is used for the heat for reclaiming high-temperature gas mixture body made from inverse transformation stove, and the heat of recovery is used for
Preheating enters the material of inverse transformation stove, and heat utilization ratio is high.
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 the system that a kind of use gas base method produces DRI, and Fig. 1 is its structural representation.
As shown in figure 1, the system includes：Gas-based shaft kiln 1, washer 2, compressor 3, nitrogen removing device 4, desulfurization and decarburization tower 5,
Heat exchanger 6, inverse transformation stove 7, inter cooler 8 and heating furnace 9.
Gas-based shaft kiln 1 has oxidation material entrance, also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet.
Washer 2 has high temperature furnace top gas entrance and the outlet of purification top gas, high temperature furnace top gas entrance and gas-based shaft kiln 1
The outlet of high temperature furnace top gas is connected.
Compressor 3 has purification top gas entrance and the outlet of compression top gas, and purification top gas entrance is net with washer 2
Change top gas outlet to be connected.
Nitrogen removing device 4 has compression top gas entrance, clean gas outlet and rich nitrogen outlet, compression top gas entrance and pressure
The compression top gas outlet of contracting machine 3 is connected.
Desulfurization and decarburization tower 5 has purified gas entrance, first also Primordial Qi outlet and CO2Outlet, purified gas entrance is with denitrogenating dress
The clean gas outlet for putting 4 is connected.
Heat exchanger 6 has low temperature H2Entrance, the first low temperature CO2Entrance, the second low temperature CO2Entrance, high-temperature gas mixture body enter
Mouth, preheating material outlet and low-temperature mixed gas vent, the first low temperature CO2The CO of entrance and desulfurization and decarburization tower 52Outlet is connected.This
Embodiment is by above-mentioned preheating H2Outlet, the first preheating CO2Outlet and the second preheating CO2Outlet connection, forms a preheating material and goes out
Mouthful, reduce the pipeline in system.
Inverse transformation stove 7 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 6 is connected, and the outlet of high-temperature gas mixture body is connected with the high-temperature gas mixture body entrance of heat exchanger 6.By
In in heat exchanger 6, H is preheated2, first preheating CO2With the second preheating CO2It is re-fed into after mixing in inverse transformation stove 7, therefore, this reality
Apply the inverse transformation stove 7 in example and be also only provided with a preheating material entrance, it is acted on and H mentioned hereinabove2Entrance, the first CO2
Entrance and the 2nd CO2The effect of entrance is identical.
Inter cooler 8 has mixed gas entrance, second also Primordial Qi outlet and water out, mixed gas entrance and heat exchanger 6
Low-temperature mixed gas vent be connected.
There is heating furnace 9 low-temperature reduction gas entrance and high temperature reduction gas to export, and low-temperature reduction gas entrance is de- with desulfurization respectively
The also Primordial Qi outlet of the first of carbon tower 5 is connected with the second also Primordial Qi outlet of inter cooler 8, the outlet of high temperature reduction gas and gas-based shaft kiln
Also Primordial Qi entrance is connected.
Embodiment 2
The present embodiment prepares DRI using the system described in embodiment 1, and idiographic flow is as follows：
Prepare raw material：Acid pellet, H of the full Iron grade for 62%2And CO2, H2And CO2Purity be 95%, remaining composition
For N2。
Prepare also Primordial Qi：
1) the High-temperature furnace top pneumatic transmission discharged from gas-based shaft kiln 1 is entered into dedusting and dehydration in washer 2, obtains purification furnace roof
Gas.It will be compressed in purification top gas feeding compressor 3, obtain compression top gas.Will compression top gas feeding nitrogen removing device 4
Middle removing N2, obtain purified gas.By in purified gas feeding desulfurization and decarburization tower 5, after desulfurization and decarburization, obtain first and go back Primordial Qi, first
CO2With rich nitrogen.
2) by the first CO2Send into heat exchanger 6, then be charged with H2With new CO2(i.e. the 2nd CO2), obtain preheating
H2And CO2Gaseous mixture.H2And CO2Volume ratio be 80:20, the temperature of the gaseous mixture after preheating is about 550 DEG C.After preheating
Gaseous mixture feeding inverse transformation stove 7 in, carry out reverse shift reaction, obtain high-temperature gas mixture body, high-temperature gas mixture body is sent back to again
H is preheated in heat exchanger 62And CO2, then it is re-fed into inter cooler 8, removes vapor therein, obtains second and go back Primordial Qi.
3) the first also Primordial Qi and the second reduction pneumatic transmission is entered in heating furnace 9, is heated to about 950 DEG C, obtains high temperature reduction gas.
Catalyst used in the stove of inverse transformation 7 is copper-based catalysts, and the temperature of reverse shift reaction is 500 DEG C.Obtained high temperature
Also H in Primordial Qi2O、CO2And N2Content be respectively 2.3%, 3.3% and 6.3%, H2Total content with CO is 88.1%.
During firm blow-on, the CO in feeding heat exchanger 62It is the 2nd CO2.Run after 10h, the 2nd CO of addition2Only account for total
CO21%.Obtained desulfurization and decarburization tower 5 is the first CO2Volume ratio with purified gas is 7:50.It is rich made from desulfurization and decarburization tower 5
Nitrogen is 28Nm3/DRI。
Reducing iron ore：High temperature reduction pneumatic transmission is entered above-mentioned acid pellet is reduced in gas-based shaft kiln 1, prepare direct-reduction
Iron.The degree of metalization of obtained DRI is 93%.
Embodiment 3
The present embodiment prepares DRI using the system described in embodiment 1, and idiographic flow is as follows：
Prepare raw material：Acid pellet, H of the full Iron grade for 67%2And CO2, H2And CO2Purity be 99%, remaining composition
For N2。
Prepare also Primordial Qi：
1) the High-temperature furnace top pneumatic transmission discharged from gas-based shaft kiln 1 is entered into dedusting and dehydration in washer 2, obtains purification furnace
Top gas.It will be compressed in purification top gas feeding compressor 3, obtain compression top gas.Compression top gas feeding is denitrogenated into dress
N is removed in putting 42, obtain purified gas.By in purified gas feeding desulfurization and decarburization tower 5, after desulfurization and decarburization, the first also Primordial Qi, the is obtained
One CO2With rich nitrogen.
2) by the first CO2Send into heat exchanger 6, then be charged with H2With new CO2(i.e. the 2nd CO2), obtain preheating
H2And CO2Gaseous mixture.H2And CO2Volume ratio be 90:10, the temperature of the gaseous mixture after preheating is about 550 DEG C.After preheating
Gaseous mixture feeding inverse transformation stove 7 in, carry out reverse shift reaction, obtain high-temperature gas mixture body, high-temperature gas mixture body is sent back to again
H is preheated in heat exchanger 62And CO2, then it is re-fed into inter cooler 8, removes vapor therein, obtains second and go back Primordial Qi.
3) the first also Primordial Qi and the second reduction pneumatic transmission is entered in heating furnace 9, is heated to about 800 DEG C, obtains high temperature reduction gas.
Catalyst used in the stove of inverse transformation 7 is ferrum-based catalyst, and the temperature of reverse shift reaction is 700 DEG C.Obtained high temperature
Also H in Primordial Qi2O、CO2And N2Content be respectively 2.3%, 3.1% and 6.1%, H2Total content with CO is 88.5%.
During firm blow-on, the CO in feeding heat exchanger 62It is the 2nd CO2.Run after 10h, the 2nd CO of addition2Only account for total
CO21%.Obtained desulfurization and decarburization tower 5 is the first CO2Volume ratio with purified gas is 8:50.It is rich made from desulfurization and decarburization tower 5
Nitrogen is 2Nm3/DRI。
Reducing iron ore：High temperature reduction pneumatic transmission is entered above-mentioned acid pellet is reduced in gas-based shaft kiln 1, prepare direct-reduction
Iron.The degree of metalization of obtained DRI is 95%.
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 utility model prepares DRI also Primordial Qi, the circulation of top gas using top gas as raw material
Utilization rate is more than 100%.Raw material has not only been saved, system energy consumption is also reduced, so as to reduce the production of DRI
Cost.
Secondly, the utility model prepares also Primordial Qi using inverse transformation stove, and inverse transformation stove used need to only load inexpensive catalyzed
Agent can obtain the also Primordial Qi of high-quality, both reduced investment, energy consumption is reduced again.The obtained also Primordial Qi of the utility model
Reducing power is strong, also CO and H in Primordial Qi2Content be higher than 85%, and also Primordial Qi reclaimed water steam content be less than 5%；By its system
The quality of the DRI obtained is high.
In addition, top gas of the present utility model recycling after desulfurization and decarburization is handled, therefore the utility model is carried
The technique of confession can be used for reducing high oxysulfide pelletizing.
The utility model can be used for industrial production device, particularly big-and-middle-sized commerical test device.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate the utility model example,
And the not restriction to embodiment.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms.There is no necessity and possibility to exhaust all the enbodiments.And thus
Among the obvious changes or variations amplified out is still in protection domain of the present utility model.
Claims (3)
1. the system that a kind of utilization top gas prepares DRI, it is characterised in that the system includes：
Gas-based shaft kiln, with oxidation material entrance, also Primordial Qi entrance, the outlet of high temperature furnace top gas and DRI outlet；
Washer, with high temperature furnace top gas entrance and the outlet of purification top gas, the high temperature furnace top gas entrance is erected with the gas base
The high temperature furnace top gas outlet of stove is connected；
Compressor, with purification top gas entrance and the outlet of compression top gas, the purification top gas entrance and the washer
Purification top gas outlet be connected；
Nitrogen removing device, with compression top gas entrance, clean gas outlet and rich nitrogen outlet, the compression top gas entrance and institute
The compression top gas outlet for stating compressor is connected；
Desulfurization and decarburization tower, with purified gas entrance, first also Primordial Qi outlet and CO2Outlet, the purified gas entrance is denitrogenated with described
The clean gas outlet of device is connected；
Heating furnace, is exported, the low-temperature reduction gas entrance takes off with the desulfurization with low-temperature reduction gas entrance and high temperature reduction gas
The also Primordial Qi outlet of the first of carbon tower is connected, and the high temperature reduction gas outlet is connected with the also Primordial Qi entrance of the gas-based shaft kiln.
2. system according to claim 1, it is characterised in that the system also includes：
Inverse transformation stove, with H2Entrance, fuel gas entrance, the first CO2Entrance, the 2nd CO2Entrance and the outlet of high-temperature gas mixture body,
First CO2The CO of entrance and the desulfurization and decarburization tower2Outlet is connected；
Inter cooler, with mixed gas entrance, second also Primordial Qi outlet and water out, the mixed gas entrance and the inversion
The high-temperature gas mixture body outlet for changing stove is connected, the described second also Primordial Qi outlet and the low-temperature reduction gas entrance phase of the heating furnace
Even.
3. system according to claim 2, it is characterised in that the system also includes heat exchanger, the heat exchanger has
Low temperature H2Entrance, the first low temperature CO2Entrance, the second low temperature CO2Entrance, high-temperature gas mixture body entrance, preheating H2It is outlet, first pre-
Hot CO2Outlet, the second preheating CO2Outlet and low-temperature mixed gas vent, the first low temperature CO2Entrance and the desulfurization and decarburization
The CO of tower2Outlet is connected, and the high-temperature gas mixture body entrance is connected with the high-temperature gas mixture body outlet of the inverse transformation stove, institute
State preheating H2Outlet and the H of the inverse transformation stove2Entrance is connected, the first preheating CO2Outlet and the first of the inverse transformation stove
CO2Entrance is connected, the second preheating CO2Outlet and the 2nd CO of the inverse transformation stove2Entrance is connected, the low-temperature mixed gas
Body outlet is connected with the mixed gas outlet of the inter cooler.
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| CN201621390732.7U CN206467265U (en) | 2016-12-16 | 2016-12-16 | The system that a kind of utilization top gas prepares DRI |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521073A (en) * | 2016-12-16 | 2017-03-22 | 江苏省冶金设计院有限公司 | System and method for preparing direct reduced iron through top gas |
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2016
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521073A (en) * | 2016-12-16 | 2017-03-22 | 江苏省冶金设计院有限公司 | System and method for preparing direct reduced iron through top gas |
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