CN107058663A - A kind of system and method for producing DRI - Google Patents
A kind of system and method for producing DRI Download PDFInfo
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- CN107058663A CN107058663A CN201710151003.9A CN201710151003A CN107058663A CN 107058663 A CN107058663 A CN 107058663A CN 201710151003 A CN201710151003 A CN 201710151003A CN 107058663 A CN107058663 A CN 107058663A
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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
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- Metallurgy (AREA)
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Abstract
The invention discloses a kind of system and method for producing DRI.The system includes gas-based shaft kiln, washer, compressor, desulfurization and decarburization tower, heat exchanger, inverse transformation stove, inter cooler and heating furnace.Washer is connected with gas-based shaft kiln and compressor respectively, and desulfurization and decarburization tower is connected with compressor, heat exchanger and heating furnace respectively, and heat exchanger is also connected with inverse transformation stove and inter cooler respectively, and heating furnace is also connected with washer, inter cooler and gas-based shaft kiln respectively.The present invention, as raw material, prepares gas-based shaft kiln also Primordial Qi, the cyclic utilization rate of top gas is more than 80% using top gas, improve the value of top gas, the preparation cost of also Primordial Qi is reduced, and reduces the pollution to environment, it is high by the quality of its obtained DRI.
Description
Technical field
The invention belongs to direct reduction processes of Iron ores field, and in particular to a kind of system for producing DRI and side
Method.
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.It is existing
Using natural gas prepare also Primordial Qi technique institute calorific requirement is more, equipment expensive, cause the cost of DRI of gained also very
It is high.
The content of the invention
In view of the shortcomings of the prior art, present invention firstly provides a kind of system for producing DRI, the system
Including：
Gas-based shaft kiln, with oxidation material entrance, high temperature reduction gas entrance, the first CO2Entrance, top gas are exported and direct
Reduced iron is exported；
Washer, is exported, the stove of the top gas entrance and the gas-based shaft kiln with top gas entrance and net top gas
Top gas outlet is connected；
Compressor, with net top gas entrance and the outlet of compression top gas, the net top gas entrance and the washer
Net top gas outlet be connected；
Desulfurization and decarburization tower, with compression top gas entrance, first also Primordial Qi outlet and CO2Outlet, the compression top gas
Entrance is connected with the compression top gas outlet of the compressor；
Heat exchanger, with H2Entrance, the 2nd CO2Entrance, high temperature inverse transformation gas access, preheating mixed gas outlet and low
Warm inverse transformation gas vent, the 2nd CO2The CO of entrance and the desulfurization and decarburization tower2Outlet is connected；
Inverse transformation stove, with preheating mixed gas entrance, high temperature inverse transformation gas vent and fuel gas entrance, the preheating
Mixed gas entrance is connected with the preheating mixed gas outlet of the heat exchanger, and the high temperature inverse transformation gas vent is changed with described
The high temperature inverse transformation gas access of hot device is connected；
Inter cooler, with low temperature inverse transformation gas access, second also Primordial Qi outlet and condensation-water drain, the low temperature inversion
Gas access is changed with the low temperature inverse transformation gas vent of the heat exchanger to be connected；
Heating furnace, with the outlet of low-temperature reduction gas entrance, fuel gas entrance and high temperature reduction gas, the low-temperature reduction gas enters
Mouth is connected with the first also Primordial Qi outlet, the second also Primordial Qi outlet of the inter cooler of the desulfurization and decarburization tower respectively, the combustion
Material gas entrance is connected with the net top gas outlet of the washer, the high temperature reduction gas outlet and the high temperature of the gas-based shaft kiln
Also Primordial Qi entrance is connected.
Further, the also Primordial Qi of the first of the desulfurization and decarburization tower exports the fuel gas entrance phase also with the heating furnace
Even.
Further, net top gas outlet or the desulfurization of the fuel gas entrance of the inverse transformation stove with the washer
The also Primordial Qi outlet of the first of decarbonizing tower is connected.
Further, the system also includes CO2Speed to put workshop, the CO2Speed to put workshop and the first of the gas-based shaft kiln
CO2Entrance is connected.
Further, the heat exchanger also includes the 3rd CO2Entrance, the 3rd CO2Entrance and the CO2Speed to put workshop
It is connected.
Present invention also offers a kind of method that utilization said system produces DRI, methods described includes following step
Suddenly：
Prepare oxidation material, the first CO2And H2；
The top gas discharged from the gas-based shaft kiln is sent into dedusting in the washer, dehydration, net top gas is obtained；
The 80%-90% purification top gas is sent into the compressor to be compressed, compression top gas is obtained；Will be surplus
Under the 10%-20% purification top gas send into the heating furnace and used as fuel；
The compression top gas is sent into the desulfurization and decarburization tower, hydrogen sulfide and carbon dioxide in removing top gas,
Obtain first and go back Primordial Qi and the 2nd CO2；
By the 2nd CO2Send into the heat exchanger, and toward adding the H in the heat exchanger2, the 2nd CO2With
The H2It is preheated after being mixed in the heat exchanger as preheating mixed gas；
The preheating mixed gas is sent into the inverse transformation stove and reacted in the presence of catalyst, high temperature is obtained
Inverse transformation gas；
By the high temperature inverse transformation gas send back in the heat exchanger with the 2nd CO2With the H2The gaseous mixture of formation
Body is exchanged heat, and the mixed gas is preheated, and the high temperature inverse transformation gas is changed into low temperature inverse transformation gas；
The low temperature inverse transformation gas is sent into the inter cooler and cooled down, the water in the low temperature inverse transformation gas is removed
Steam, obtains second and goes back Primordial Qi；
Described first also Primordial Qi, the second reduction pneumatic transmission is entered and heated in the heating furnace, acquisition high temperature reduction
Gas；
The high temperature reduction pneumatic transmission is entered in the gas-based shaft kiln, for reducing the oxidation material, is reduced directly
Iron；The gas-based shaft kiln uses the first CO2Carry out dynamic sealing.
Further, go back Primordial Qi using described the first of 1%-20% and sent into as fuel gas in the heating furnace and fired
There is provided heat for burning；Remaining 80%-99% the first reduction pneumatic transmission is entered and heated in the heating furnace, is prepared high
Temperature also Primordial Qi.
Further, the fuel gas that the inverse transformation stove is used is that the purification top gas or described first go back Primordial Qi.
Further, the first CO2The amount of leaking into for 10-20 marks it is vertical/DRI.
Further, the catalyst is copper-based catalysts or ferrum-based catalyst.
The present invention, as raw material, prepares gas-based shaft kiln also Primordial Qi using top gas, and the cyclic utilization rate of top gas exists
More than 80%, the value of top gas is improved, the preparation cost of also Primordial Qi is reduced, and reduces the pollution to environment.
Secondly, gas-based shaft kiln of the invention uses CO2Dynamic sealing is carried out, good sealing function can not only be played, together
When reduce N in top gas2Enrichment, therefore the cyclic utilization rate of top gas can be improved, and leak into the CO in top gas2Can
It is used as the reaction raw materials of follow-up inverse transformation process.
Further, the present invention 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 also proper energy of also Primordial Qi produced by the present invention
Power is strong, also CO and H in Primordial Qi2Content be higher than 85%, it is high by the quality of its obtained DRI.
In addition, top gas recycling after desulfurization and decarburization is handled of the present invention, therefore the technique that the present invention is provided
Available for reducing high oxysulfide pelletizing.
The present invention can be used for industrial production device, particularly big-and-middle-sized commerical test device.
Brief description of the drawings
Fig. 1 be the embodiment of the present invention in a kind of DRI preparation system structural representation；
Fig. 2 prepares the process chart of DRI for a kind of utilization said system in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and examples, the embodiment to the present invention is described in more details, so as to energy
Enough more fully understand the solution of the present invention and the advantage of its various aspects.However, specific embodiments described below and reality
Apply the purpose that example is only explanation, rather than limitation of the present invention.
As shown in figure 1, the system for the production DRI that the present invention is provided includes：Gas-based shaft kiln 1, washer 2, compression
Machine 3, desulfurization and decarburization tower 4, heat exchanger 5, inverse transformation stove 6, inter cooler 7, heating furnace 8 and CO2Speed to put workshop 9.
Gas-based shaft kiln 1 has oxidation material entrance, high temperature reduction gas entrance, the first CO2Entrance, top gas are exported and direct
Reduced iron is exported.
There is washer 2 top gas entrance and net top gas to export, and the top gas of top gas entrance and gas-based shaft kiln 1 is exported
It is connected.
Compressor 3 has net top gas entrance and the outlet of compression top gas, the net furnace roof of net top gas entrance and washer 2
Gas outlet is connected.
Desulfurization and decarburization tower 4 has compression top gas entrance, first also Primordial Qi outlet and CO2Outlet, compresses top gas entrance
It is connected with the compression top gas outlet of compressor 3.
Heat exchanger 5 has H2Entrance, the 2nd CO2Entrance, the 3rd CO2Entrance, high temperature inverse transformation gas access, pre- hot mixing
Gas vent and low temperature inverse transformation gas vent, the 2nd CO2The CO of entrance and desulfurization and decarburization tower 42Outlet is connected.
Inverse transformation stove 6 has preheating mixed gas entrance, high temperature inverse transformation gas vent and fuel gas entrance, pre- hot mixing
Gas access is connected with the preheating mixed gas outlet of heat exchanger 5, the high temperature inversion of high temperature inverse transformation gas vent and heat exchanger 5
Change gas access to be connected, fuel gas entrance goes back Primordial Qi with the net top gas outlet of washer 2 and the first of desulfurization and decarburization tower 4 respectively
Outlet is connected.
Inter cooler 7 has low temperature inverse transformation gas access, second also Primordial Qi outlet and condensation-water drain, low temperature inversion ventilation
Body entrance is connected with the low temperature inverse transformation gas vent of heat exchanger 5.
Heating furnace 8 has low-temperature reduction gas entrance, fuel gas entrance and the outlet of high temperature reduction gas, low-temperature reduction gas entrance point
Be not connected with the first of desulfurization and decarburization tower 4 the also Primordial Qi outlet, the second also Primordial Qi outlet of inter cooler 7, fuel gas entrance respectively with
The net top gas outlet of washer 2 is connected with the first also Primordial Qi outlet of desulfurization and decarburization tower 4, and the outlet of high temperature reduction gas is erected with gas base
The high temperature reduction gas entrance of stove 1 is connected.
CO2Speed to put first CO of the workshop 9 respectively with gas-based shaft kiln 123rd CO of entrance and heat exchanger 52Entrance is connected.
Contain N in top gas2, in order to prevent N2Unrestricted circulation, it is therefore desirable to discharge a part of top gas.The present invention will
The net top gas of washer 2 and the first of a desulfurization and decarburization tower 4 also Primordial Qi discharge part, and inverse transformation is supplied as fuel gas
Stove 6 and heating furnace 8 are used.In Fig. 1, the net top gas of the fuel gas entrance of inverse transformation stove 6 and heating furnace 8 simultaneously with washer 2
The first also Primordial Qi outlet with desulfurization and decarburization tower 4 is exported to be connected.It should be noted that the fuel gas entrance of inverse transformation stove 6 or add
The fuel gas entrance of hot stove 8 also can be exported individually with the net top gas outlet of washer 2 or the first also Primordial Qi of desulfurization and decarburization tower 4
It is connected.
The CO of the present invention2Speed to put the CO that workshop 9 can be coal plant or petrochemical plant2Speed to put workshop, it is of the invention by it
Change harmful to treasure for producing reducing agent CO, can greatly reduce the CO for going back original system generation2Discharge.
Heat exchanger 5 sets the 3rd CO2The purpose of entrance is in order to toward adding new CO in system2, to prepare more CO.
It will be apparent that heat exchanger 5 can not also set the 3rd CO2Entrance, now, prepares the second CO for going back Primordial Qi2Can be de- from desulfurization entirely
The 2nd CO that carbon tower 4 is discharged2。
The present invention, as raw material, prepares gas-based shaft kiln also Primordial Qi using top gas, and the cyclic utilization rate of top gas exists
More than 80%, the value of top gas is improved, the preparation cost of also Primordial Qi is reduced, and reduces the pollution to environment.
Further, the present invention 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 also proper energy of also Primordial Qi produced by the present invention
Power is strong, also CO and H in Primordial Qi2Content be higher than 85%, it is high by the quality of its obtained DRI.
In addition, top gas recycling after desulfurization and decarburization is handled of the present invention, therefore the technique that the present invention is provided
Available for reducing high oxysulfide pelletizing.
The present invention can be used for industrial production device, particularly big-and-middle-sized commerical test device.
As shown in Fig. 2 the method that the utilization said system that the present invention is provided produces DRI, comprises the following steps：
1) oxidation material, the first CO are prepared2, the 3rd CO2And H2。
2) top gas discharged from gas-based shaft kiln 1 is sent into dedusting in washer 2, dehydration, obtains net top gas.
3) 80%-90% purification top gas feeding compressor 3 is compressed, obtains compression top gas；Will be remaining
Used in 10%-20% purification top gas feeding inverse transformation stove 6 and heating furnace 8 as fuel gas.
4) will be in compression top gas feeding desulfurization and decarburization tower 4, hydrogen sulfide and carbon dioxide in removing top gas obtain the
One goes back Primordial Qi and the 2nd CO2。
5) by the 2nd CO2Send into heat exchanger 5, and toward adding H in heat exchanger2With the 3rd CO2, the 2nd CO2, the 3rd CO2With
H2It is preheated after being mixed in heat exchanger 5 as preheating mixed gas.
6) it will be reacted in preheating mixed gas feeding inverse transformation stove 6 in the presence of catalyst, obtain high temperature inversion
Ventilation body.
7) by high temperature inverse transformation gas send back in heat exchanger 5 with the 2nd CO2, the 3rd CO2And H2The mixed gas of formation is changed
Heat, mixed gas is preheated, and high temperature inverse transformation gas is changed into low temperature inverse transformation gas.
8) low temperature inverse transformation gas is sent into inter cooler 7 and cooled down, remove the vapor in low temperature inverse transformation gas, obtained
Second goes back Primordial Qi.
9) go back Primordial Qi using the first of 1%-20% and sent into as fuel gas in inverse transformation stove 6 and heating furnace 8 and burnt, carried
Heating load.
10) the first reduction pneumatic transmission of the second also Primordial Qi and remaining 80%-99% is entered and heated in heating furnace 8, obtained
Obtain high temperature reduction gas.
11) high temperature reduction pneumatic transmission is entered in gas-based shaft kiln 1, for reduction-oxidation material, obtains DRI.
In the present invention, gas-based shaft kiln 1 uses CO2(it is referred to as the first CO in the present invention2) dynamic sealing is carried out, can not only
Good sealing function is played, while reducing N in top gas2Enrichment, therefore the cyclic utilization rate of top gas can be improved, and
Leak into the CO in top gas2Can as follow-up inverse transformation process reaction raw materials.First CO2From CO2Speed to put workshop.
In the preferred embodiment of the invention, the first CO2The amount of leaking into for 10-20 marks it is vertical/DRI.
3rd CO2Also CO is derived from2Speed to put workshop, be the same as those described above, also can not be toward the 3rd CO of addition in heat exchanger 52。
It is the same as those described above, the fuel gas used in inverse transformation stove 6 or heating furnace 8 also can be that purification top gas or first go back Primordial Qi
In one kind.
The degree of metalization of DRI produced by the present invention is higher than 90%.
CO2And H2Reacted as follows in the presence of catalyst (present invention is also referred to as reverse shift reaction)：
CO2+H2=CO+H2O
In the preferred embodiment of the invention, the 2nd CO2, the 3rd CO2And H2Volume ratio be (15-30)：(0.1-15)：
(65-80)。
CO2And H2Reverse shift reaction belong to the endothermic reaction, but enter inversion as a result of the preheating of high temperature inverse transformation gas
Change the CO of stove 62And H2, therefore, CO2And H2When carrying out reverse shift reaction, required heat is without too many.Currently preferred
In embodiment, mixed gas is preheated to 400 DEG C -650 DEG C.In the preferred embodiment of the invention, preheating mixed gas is inverse
Reaction temperature in change furnace 6 is 500 DEG C -700 DEG C.
The present invention prepares also Primordial Qi using inverse transformation stove, and inverse transformation stove used need to only load cheap catalyst and can obtain
The also Primordial Qi of high-quality.Investment can be reduced, energy consumption can be reduced again.The reducing power of also Primordial Qi produced by the present invention is strong, reduction
CO and H in gas2Content be higher than 85%.In the preferred embodiment of the invention, catalyst is that copper-based catalysts or iron-based are catalyzed
Agent.
CO and H also in Primordial Qi2Total content the higher the better, CO2Content with vapor is more low better.It is excellent in the present invention
In the embodiment of choosing, content≤3.5% of the vapor of high temperature reduction gas.In the preferred embodiment of the invention, high temperature reduction
CO in gas2Content≤4.5%.
In the preferred embodiment of the invention, the mol ratio of the second also Primordial Qi and the first also Primordial Qi is 0.4:1-0.6:When 1,
H in the mixing of acquisition also Primordial Qi2/ CO ratio is 1.5-1.9, high with the degree of metalization of its obtained DRI.
The reaction for preparing DRI is the endothermic reaction, therefore, and also then Primordial Qi be re-fed into gas using heating is preceding needed
In base shaft furnace.Found by substantial amounts of experiment, before feeding gas-based shaft kiln, also Primordial Qi is preferably heated to 800 DEG C -1000 DEG C.
The first CO that the present invention is used2, the 3rd CO2And H2Purity >=90%, other compositions are N2。
It should be noted that outer unless specified otherwise, the percentage composition of all gases referred to of the present invention is volume content,
The percentage of gas is percent by volume.
Below with reference to specific embodiment, the present invention will be described.Institute's taking technique condition value is in following embodiments
Exemplary, its desirable number range is as shown in foregoing summary.Detection method used in following embodiments is one's own profession
The conventional detection method of industry.
Embodiment 1
The detailed process of the present embodiment production DRI is as follows：
(1) also Primordial Qi is prepared：
1) prepare first and go back Primordial Qi：
The top gas discharged from gas-based shaft kiln 1 is sent into dedusting in washer 2, dehydration, net top gas is obtained.
It will be compressed in 80% net top gas feeding compressor 3, obtain compression top gas.
Compression top gas is sent into desulfurization and decarburization tower 4, hydrogen sulfide and carbon dioxide in removing top gas obtain first
Also Primordial Qi, the 2nd CO2.2nd CO2Volume ratio with the first also Primordial Qi is 1:9.
2) prepare second and go back Primordial Qi：
Prepare the first CO2, the 3rd CO2And H2；First CO2, the 3rd CO2From CO2Speed to put workshop 9, CO2Speed to put workshop 9 be
Petrochemical plant CO2Speed to put workshop；First CO2, the 3rd CO2And H2Purity be 95%, remaining composition be N2。
By the 2nd CO2Send into heat exchanger 5, and toward the 3rd CO of addition in heat exchanger2And H2, the 2nd CO2, the 3rd CO2And H2
It is preheated after being mixed in heat exchanger 5 as preheating mixed gas.2nd CO2, the 3rd CO2And H2Volume ratio be 30：0.1：70,
The temperature of the preheating mixed gas of acquisition is 400 DEG C.
It will be reacted in preheating mixed gas feeding inverse transformation stove 6 in the presence of catalyst, obtain high temperature inverse transformation
Gas.It is 500 DEG C to preheat reaction temperature of the mixed gas in inverse transformation stove 6, and the catalyst used in inverse transformation stove 6 is urged to be copper-based
Agent.
By high temperature inverse transformation gas send back in heat exchanger 5 with the 2nd CO2, the 3rd CO2And H2The heat transfer of mixture gas of formation,
Mixed gas is preheated, and high temperature inverse transformation gas is changed into low temperature inverse transformation gas.
Low temperature inverse transformation gas is sent into inter cooler 7 and cooled down, removes the vapor in low temperature inverse transformation gas, obtains the
Two go back Primordial Qi.
(2) DRI is prepared
Prepare the acid pellet that full Iron grade is 62%；
First also Primordial Qi and the second reduction pneumatic transmission is entered to be heated to 1000 DEG C in heating furnace 8 after mixing, high temperature reduction is obtained
Gas.The mol ratio of second also Primordial Qi and the first also Primordial Qi is 0.4:1；CO and H in high temperature reduction gas2Content be 90%, H2/CO
Ratio be 1.5；The content of vapor is 3.5%, CO in high temperature reduction gas2Content be 4.5%.The combustion that heating furnace 8 is used
Expect the net top gas that gas is remaining 20%.
High temperature reduction pneumatic transmission is entered above-mentioned acid pellet is reduced in gas-based shaft kiln 1, prepare DRI.Gas-based shaft kiln 1
Using the first CO2Carry out dynamic sealing, the first CO2The amount of leaking into for 20 marks it is vertical/DRI.
The degree of metalization of obtained DRI is 93%.
Embodiment 2
The detailed process of the present embodiment production DRI is as follows：
(1) also Primordial Qi is prepared：
1) prepare first and go back Primordial Qi：
The top gas discharged from gas-based shaft kiln 1 is sent into dedusting in washer 2, dehydration, net top gas is obtained.
It will be compressed in 90% net top gas feeding compressor 3, obtain compression top gas.
Compression top gas is sent into desulfurization and decarburization tower 4, hydrogen sulfide and carbon dioxide in removing top gas obtain first
Also Primordial Qi, the 2nd CO2.2nd CO2Volume ratio with the first also Primordial Qi is 1:4.
2) prepare second and go back Primordial Qi：
Prepare the first CO2And H2；First CO2From CO2Speed to put workshop 9, CO2Speed to put workshop 9 for coal plant CO2Speed to put car
Between；First CO2And H2Purity be 99%, remaining composition be N2。
By the 2nd CO2Send into heat exchanger 5, and toward adding H in heat exchanger2, the 2nd CO2And H2After being mixed in heat exchanger 5
It is preheated as preheating mixed gas.2nd CO2And H2Volume ratio be 20：80, the temperature of the preheating mixed gas of acquisition is 650
℃。
It will be reacted in preheating mixed gas feeding inverse transformation stove 6 in the presence of catalyst, obtain high temperature inverse transformation
Gas.It is 700 DEG C to preheat reaction temperature of the mixed gas in inverse transformation stove 6, and the catalyst used in inverse transformation stove 6 is urged for iron-based
Agent.
By high temperature inverse transformation gas send back in heat exchanger 5 with the 2nd CO2And H2The heat transfer of mixture gas of formation, mixed gas
It is preheated, high temperature inverse transformation gas is changed into low temperature inverse transformation gas.
Low temperature inverse transformation gas is sent into inter cooler 7 and cooled down, removes the vapor in low temperature inverse transformation gas, obtains the
Two go back Primordial Qi.
(2) DRI is prepared
Prepare the acid pellet that full Iron grade is 65%；
Second also Primordial Qi and the first of 99% the reduction pneumatic transmission is entered to be heated to 800 DEG C in heating furnace 8 after mixing, high temperature is obtained
Also Primordial Qi.The mol ratio of second also Primordial Qi and the first also Primordial Qi is 0.6:1；CO and H in high temperature reduction gas2Content be 91%,
H2/ CO ratio is 1.9；The content of vapor is 2.3%, CO in high temperature reduction gas2Content be 4%.What heating furnace 8 was used
Fuel gas is remaining 10% net top gas and the 1% the first also Primordial Qi.
High temperature reduction pneumatic transmission is entered above-mentioned acid pellet is reduced in gas-based shaft kiln 1, prepare DRI.Gas-based shaft kiln 1
Using the first CO2Carry out dynamic sealing, the first CO2The amount of leaking into for 10 marks it is vertical/DRI.
The degree of metalization of obtained DRI is 94%.
Embodiment 3
The detailed process of the present embodiment production DRI is as follows：
(1) also Primordial Qi is prepared：
1) prepare first and go back Primordial Qi：
The top gas discharged from gas-based shaft kiln 1 is sent into dedusting in washer 2, dehydration, net top gas is obtained.
It will be compressed in 85% net top gas feeding compressor 3, obtain compression top gas.
Compression top gas is sent into desulfurization and decarburization tower 4, hydrogen sulfide and carbon dioxide in removing top gas obtain first
Also Primordial Qi, the 2nd CO2.First goes back Primordial Qi and the 2nd CO2Volume ratio be 1:6.
2) prepare second and go back Primordial Qi：
Prepare the first CO2, the 3rd CO2And H2；First CO2, the 3rd CO2From CO2Speed to put workshop 9, CO2Speed to put workshop 9 be
Petrochemical plant CO2Speed to put workshop；First CO2, the 3rd CO2And H2Purity be 97%, remaining composition be N2。
By the 2nd CO2Send into heat exchanger 5, and toward the 3rd CO of addition in heat exchanger2And H2, the 2nd CO2, the 3rd CO2And H2
It is preheated after being mixed in heat exchanger 5 as preheating mixed gas.2nd CO2, the 3rd CO2And H2Volume ratio be 15：15：65, obtain
The temperature of the preheating mixed gas obtained is 500 DEG C.
It will be reacted in preheating mixed gas feeding inverse transformation stove 6 in the presence of catalyst, obtain high temperature inverse transformation
Gas.It is 600 DEG C to preheat reaction temperature of the mixed gas in inverse transformation stove 6, and the catalyst used in inverse transformation stove 6 is urged to be copper-based
Agent.
By high temperature inverse transformation gas send back in heat exchanger 5 with the 2nd CO2, the 3rd CO2And H2The heat transfer of mixture gas of formation,
Mixed gas is preheated, and high temperature inverse transformation gas is changed into low temperature inverse transformation gas；
Low temperature inverse transformation gas is sent into inter cooler 7 and cooled down, removes the vapor in low temperature inverse transformation gas, obtains the
Two go back Primordial Qi.
(2) DRI is prepared
Prepare the acid pellet that full Iron grade is 63%；
Second also Primordial Qi and the first of 80% the reduction pneumatic transmission is entered to be heated to 900 DEG C in heating furnace 8 after mixing, high temperature is obtained
Also Primordial Qi.The mol ratio of second also Primordial Qi and the first also Primordial Qi is 0.5:1；CO and H in high temperature reduction gas2Content be 88%,
H2/ CO ratio is 1.7；The content of vapor is 2.3%, CO in high temperature reduction gas2Content be 3.5%.Heating furnace 8 is used
Fuel gas be washer 2 discharge periodic off-gases.
High temperature reduction pneumatic transmission is entered above-mentioned acid pellet is reduced in gas-based shaft kiln 1, prepare DRI.Gas-based shaft kiln 1
Using the first CO2Carry out dynamic sealing, the first CO2The amount of leaking into for 15 marks it is vertical/DRI.
The fuel gas that inverse transformation stove 6 and heating furnace 8 are used is remaining 15% net top gas and the 20% the first also Primordial Qi.
The degree of metalization of obtained DRI is 92%.
To sum up, the present invention prepares gas-based shaft kiln also Primordial Qi, the cyclic utilization rate of top gas using top gas as raw material
More than 80%, the value of top gas is improved, the preparation cost of also Primordial Qi is reduced, and reduces the dirt to environment
Dye.
Secondly, gas-based shaft kiln of the invention uses CO2Dynamic sealing is carried out, good sealing function can not only be played, together
When reduce N in top gas2Enrichment, therefore the cyclic utilization rate of top gas can be improved, and leak into the CO in top gas2Can
It is used as the reaction raw materials of follow-up inverse transformation process.
Further, the present invention 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 also proper energy of also Primordial Qi produced by the present invention
Power is strong, also CO and H in Primordial Qi2Content be higher than 85%, it is high by the quality of its obtained DRI.
In addition, top gas recycling after desulfurization and decarburization is handled of the present invention, therefore the technique that the present invention is provided
Available for reducing high oxysulfide pelletizing.
The present invention can be used for industrial production device, particularly big-and-middle-sized commerical test device.
Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and not to embodiment
Limit.For those of ordinary skill in the field, other multi-forms can also be made on the basis of the above description
Change or variation.There is no necessity and possibility to exhaust all the enbodiments.And thus amplify out it is apparent
Change or change still in protection scope of the present invention among.
Claims (10)
1. a kind of system for producing DRI, it is characterised in that the system includes：
Gas-based shaft kiln, with oxidation material entrance, high temperature reduction gas entrance, the first CO2Entrance, top gas outlet and direct-reduction
Iron is exported；
Washer, is exported, the top gas of the top gas entrance and the gas-based shaft kiln with top gas entrance and net top gas
Outlet is connected；
Compressor, with net top gas entrance and the outlet of compression top gas, the net top gas entrance is net with the washer
Top gas outlet is connected；
Desulfurization and decarburization tower, with compression top gas entrance, first also Primordial Qi outlet and CO2Outlet, it is described compression top gas entrance with
The compression top gas outlet of the compressor is connected；
Heat exchanger, with H2Entrance, the 2nd CO2Entrance, high temperature inverse transformation gas access, preheating mixed gas outlet and low temperature are inverse
Convert gas vent, the 2nd CO2The CO of entrance and the desulfurization and decarburization tower2Outlet is connected；
Inverse transformation stove, with preheating mixed gas entrance, high temperature inverse transformation gas vent and fuel gas entrance, the pre- hot mixing
Gas access is connected with the preheating mixed gas outlet of the heat exchanger, the high temperature inverse transformation gas vent and the heat exchanger
High temperature inverse transformation gas access be connected；
Inter cooler, with low temperature inverse transformation gas access, second also Primordial Qi outlet and condensation-water drain, the low temperature inversion ventilation
Body entrance is connected with the low temperature inverse transformation gas vent of the heat exchanger；
Heating furnace, with the outlet of low-temperature reduction gas entrance, fuel gas entrance and high temperature reduction gas, the low-temperature reduction gas entrance point
It is not connected with the first also Primordial Qi outlet, the second also Primordial Qi outlet of the inter cooler of the desulfurization and decarburization tower, the fuel gas
Entrance is connected with the net top gas outlet of the washer, the high temperature reduction gas outlet and the high temperature reduction of the gas-based shaft kiln
Gas entrance is connected.
2. system according to claim 1, it is characterised in that the fuel gas entrance of the heating furnace is also de- with the desulfurization
The also Primordial Qi outlet of the first of carbon tower is connected.
3. system according to claim 1, it is characterised in that the fuel gas entrance of the inverse transformation stove and the washer
Net top gas outlet and/or the desulfurization and decarburization tower first also Primordial Qi outlet be connected.
4. system according to claim 1, it is characterised in that the system also includes CO2Speed to put workshop, the CO2Speed to put
Workshop and the first CO of the gas-based shaft kiln2Entrance is connected.
5. system according to claim 4, it is characterised in that the heat exchanger also includes the 3rd CO2Entrance, the described 3rd
CO2Entrance and the CO2Speeding, it is connected to put workshop.
6. a kind of method that any described system produces DRI in utilization claim 1-5, it is characterised in that described
Method comprises the following steps：
Prepare oxidation material, the first CO2And H2；
The top gas discharged from the gas-based shaft kiln is sent into dedusting in the washer, dehydration, net top gas is obtained；
The 80%-90% purification top gas is sent into the compressor to be compressed, compression top gas is obtained；Will be remaining
The 10%-20% purification top gas is sent into the heating furnace and used as fuel；
The compression top gas is sent into the desulfurization and decarburization tower, hydrogen sulfide and carbon dioxide in removing top gas are obtained
First goes back Primordial Qi and the 2nd CO2；
By the 2nd CO2Send into the heat exchanger, and toward adding the H in the heat exchanger2, the 2nd CO2With it is described
H2It is preheated after being mixed in the heat exchanger as preheating mixed gas；
The preheating mixed gas is sent into the inverse transformation stove and reacted in the presence of catalyst, high temperature inversion is obtained
Ventilation body；
By the high temperature inverse transformation gas send back in the heat exchanger with the 2nd CO2With the H2The mixed gas of formation is changed
Heat, the mixed gas is preheated, and the high temperature inverse transformation gas is changed into low temperature inverse transformation gas；
The low temperature inverse transformation gas is sent into the inter cooler and cooled down, the water removed in the low temperature inverse transformation gas steams
Gas, obtains second and goes back Primordial Qi；
Described first also Primordial Qi, the second reduction pneumatic transmission is entered and heated in the heating furnace, acquisition high temperature reduction gas；
The high temperature reduction pneumatic transmission is entered in the gas-based shaft kiln, for reducing the oxidation material, DRI is obtained；Institute
Gas-based shaft kiln is stated using the first CO2Carry out dynamic sealing.
7. method according to claim 6, it is characterised in that regard described the first of 1%-20% the also Primordial Qi as fuel gas
Send into the heating furnace and burnt that there is provided heat；Remaining 80%-99% the first reduction pneumatic transmission is entered into described add
Heated in hot stove, prepare high temperature reduction gas.
8. method according to claim 7, it is characterised in that the fuel gas that the inverse transformation stove is used is the purification furnace
Top gas and/or described first also Primordial Qi.
9. method according to claim 6, it is characterised in that the first CO2The amount of leaking into for 10-20 marks it is vertical/DRI.
10. method according to claim 6, it is characterised in that the catalyst is copper-based catalysts or ferrum-based catalyst.
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| CN201710151003.9A CN107058663A (en) | 2017-03-14 | 2017-03-14 | A kind of system and method for producing DRI |
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