CN106834581A - A kind of top gas of reduction shaft furnace production sponge iron utilizes system and method - Google Patents
A kind of top gas of reduction shaft furnace production sponge iron utilizes system and method Download PDFInfo
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- CN106834581A CN106834581A CN201710131971.3A CN201710131971A CN106834581A CN 106834581 A CN106834581 A CN 106834581A CN 201710131971 A CN201710131971 A CN 201710131971A CN 106834581 A CN106834581 A CN 106834581A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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Abstract
Top gas the present invention relates to a kind of reduction shaft furnace production sponge iron utilizes system and method.System includes preheating can, scrubbing tower, dehydrator, decarbonization system, cooling gas input pipe, cooling gas discharge pipe and prereduction tank, preheating can, scrubbing tower, dehydrator and decarbonization system are sequentially connected located at the outside of reduction shaft furnace, the preheating gas entrance connection top gas outlet of preheating can；Cooling gas input pipe and cooling gas discharge pipe are located at the bottom cooling section of reduction shaft furnace and are connected with cooling section inside；Cool down the cooling gas outlet of the entrance connection decarbonization system of gas input pipe；Prereduction tank is connected located at the outside of reduction shaft furnace, the prereduction gas access of prereduction tank with the outlet of cooling gas discharge pipe.The present invention can make full use of high temperature furnace top gas contained by heat energy ore is preheated, can utilize cooling after top gas heat energy and coal gas in CO, H2Reducing gas carries out prereduction to the ore after preheating, reduces shaft furnace energy consumption, realizes low-carbon (LC) and the environmental protection of shaft furnace ironmaking technology.
Description
Technical field
The invention belongs to reduction shaft furnace field, and in particular to a kind of top gas of reduction shaft furnace production sponge iron utilizes system
And method.
Background technology
China is steel big producer, and China mainland crude steel yield is 8.04 hundred million tons within 2015, accounts for global total output
49.5%.But steel industry unreasonable structure, iron steel is smaller than high, electric steel ratio, the special rolling shapes in part also need into
Mouthful, based on the flow long of blast furnace ironmaking-pneumatic steelmaking, energy consumption is big, production cost is high, economic benefit for process for making
Difference.Gas-based shaft kiln directly reduced technology has obtained ripe application abroad as main non-blast furnace ironmaking technology, with energy consumption
Sintering, two highly energy-consumings of coking, high pollution operation low, be related to without blast furnace ironmaking, with flow is short, effects of energy saving and emission reduction
Obvious advantage, is to improve steel products structure, improves steel products quality, realizes the important production technology that cleaning is smelted.
Gas-based shaft kiln mainly has Midrex and HYL techniques, main to produce also Primordial Qi using gas renormalizing method, and then also
Former iron ore.Midrex top gas cooling techniques are to cool down gas using net stock gas as shaft furnace bottom sponge iron, complete cooling
Stock gas after process is re-used as reformation agent and mixes with natural gas, reburner is then passed through after preheating and produces also Primordial Qi, enters back into
Iron ore is reduced in shaft furnace.Part stock gas mix with appropriate natural gas after as reburner fuel.But technique is adopted
External reforming stove is used, increases investment, it is necessary to consume the noble metal catalysts such as a large amount of Ni bases, operating cost is higher.
HYL-ZR (Energiron) technique cancels gas renormalizing stove, with by the top gas after washing, purifying as reformation
Agent is mixed into stove with natural gas, is catalyst reformation generation also Primordial Qi by the sponge iron in stove.For natural gas resource indigently
Area, while develop producing also Primordial Qi production sponge iron technology, its top gas Land use systems and tradition MIDREX with coke-stove gas
And HYL-ZR techniques are similar.Reduction shaft furnace process air consumption is big, and the top gas temperature after reducing iron ore is about 400 DEG C of left sides
The right side, rich in the utilization also not yet in effect of a large amount of sensible heats, while CO+H in top gas2Content is still higher, with certain reducing power.Cause
This, the technique how research stock gas efficiently utilizes has particularly important meaning to shaft furnace iron-smelting process flow reducing energy consumption
Justice.
Top gas heat energy recovery rate is relatively low when therefore, for prior art shaft furnace production sponge iron, can only recovery section heat
Energy and by-product middle pressure steam, and stock gas complex disposal process, handling process are only applicable to melting producer-shaft furnace process,
It is not particularly suited for being reformed as unstripped gas with natural gas, coke-stove gas and produces the problem that also Primordial Qi produces sponge iron process, it is necessary to
Propose that a kind of new top gas utilizes technology.
The content of the invention
Top gas it is an object of the invention to provide a kind of reduction shaft furnace production sponge iron utilizes system and method, mainly
In order to improve top gas heat energy recovery rate, simplify stock gas processing procedure, and suitable for natural gas, coke-stove gas as raw material
Gas is reformed to produce and goes back the technique that Primordial Qi produces sponge iron.
Top gas the invention provides a kind of reduction shaft furnace production sponge iron utilizes system, and the system is including preheating
Tank, scrubbing tower, dehydrator, decarbonization system, cooling gas input pipe, cooling gas discharge pipe and prereduction tank, wherein, the preheating
Tank, scrubbing tower, dehydrator and decarbonization system are sequentially connected located at the outside of reduction shaft furnace, the preheating gas entrance of the preheating can
Connect the top gas outlet of the reduction shaft furnace；The cooling gas input pipe and cooling gas discharge pipe are sequentially arranged in institute from top to bottom
State the bottom cooling section of reduction shaft furnace and be connected with inside the cooling section；The entrance connection of the cooling gas input pipe is described
The cooling gas outlet of decarbonization system；The prereduction tank is located at the outside of the reduction shaft furnace, the prereduction of the prereduction tank
Gas access is connected with the outlet of the cooling gas discharge pipe.
Above-mentioned top gas utilizes system, and compressor is also associated between the dehydrator and decarbonization system.
Above-mentioned top gas utilizes system, and compression train is connected between the cooling gas input pipe and the decarbonization system
System, the compression system is also connected with coke-stove gas or natural gas line.
Further, the system also includes the heat exchanger, dehydration equipment, the second compressor, the CO that are sequentially connected2Removing
Device and heater, the heat exchanger are connected with the gas exit of the prereduction tank；The gas access of the heater also connects
Connect pressurization coke-stove gas or natural gas line；The mixture output tube road of the heater intersect with oxygen channel connection after with institute
The also Primordial Qi entrance for stating reduction shaft furnace is connected.
Further, the fuel inlet of the heater connects the gas exit of the dehydration equipment.
The present invention also provides a kind of top gas Application way of above-mentioned top gas using system, and methods described includes following
Step：
The top gas of reduction shaft furnace is passed through the preheating can, cold conditions pelletizing is dried and preheated；
The top gas that will be discharged from the preheating can sends into the scrubbing tower and carries out cooling dedusting；
By it is described cooling dedusting after top gas be dehydrated, decarburization；
The high-temperature sponge iron in reduction shaft furnace cooling section is cooled down using the decarbonization gas after the decarburization as cooling gas；
The High-temperature cooling gas discharged from the cooling section is passed through in the iron ore after preheating, the iron ore is carried out pre-
Reduction.
Above-mentioned top gas Application way, also pressurizes between the dehydration and decarbonation process to the top gas,
CO in the decarbonization gas after decarburization2Volume content≤1%, H2Volume content≤2% of O.
Further, above-mentioned top gas Application way, the decarbonization gas after decarburization are gone back before cooling down high-temperature sponge iron
Including step：By the decarbonization gas it is pressurized after mix with coke-stove gas or natural gas.
Above-mentioned top gas Application way, methods described is further comprised：By the coal gas after the prereduction through overheat
Mix with pressurization coke-stove gas or natural gas after exchange, dehydration, pressurization, decarburization and heated, the high-temperature gas mixture after heating leads to
Entering carries out reforming reaction in shaft furnace, generation also Primordial Qi is reduced to iron ore in stove.
Above-mentioned top gas Application way, the preheating with fuel include from the prereduction discharge after by heat exchange with
The coal gas of dehydration.
The present invention is dried and preheated using the sensible heat of high temperature furnace top gas to iron ore, the top gas warp after the completion of preheating
Pressurizeed into decarbonization system removing CO after crossing cooling dedusting, dehydration2, consequently as the cooling gas of high-temperature sponge iron, it is passed through reduction
Shaft furnace cooling section, the high temperature furnace top gas for completing cooling procedure is used for carrying out prereduction to the iron ore after preheating again.
Further, the present invention mixes the top gas after the completion of reduction in advance as reformation agent with natural gas or coke-stove gas
Shaft furnace is passed through after heat, is carried out from the generation CO and H that reforms as catalyst by the sponge iron after reduction2, and then iron in reduction shaft furnace
Ore.
The present invention can make full use of high temperature furnace top gas contained by heat energy ore is preheated, and can using cooling after
CO, H in the heat energy and coal gas of top gas2Reducing gas carries out further prereduction to the ore after preheating.Make prereduction
The shaft furnace hot charging pelletizing process that pelletizing afterwards enters shaft furnace can greatly reduce shaft furnace energy consumption, realize the low-carbon (LC) of shaft furnace ironmaking technology
Produced with environmental protection.The present invention further uses the steam reforming technology of natural gas or coke-stove gas in shaft furnace, can avoid outer
The consumption costs of the precious metal catalyst such as the investment of portion's reburner and Ni bases, significantly reduces production cost.
The present invention is reasonable using each processing step linking of top gas, takes into full account with natural gas, coke-stove gas as raw material
Gas is reformed and produces the characteristics of also Primordial Qi produces sponge iron so that top gas combines with natural gas, coke-stove gas, each several part association
Same-action, obtains splendid low energy consumption, the effect of environmental protection and energy saving.
Brief description of the drawings
Fig. 1 utilizes process system schematic flow sheet for the shaft furnace stock gas of the embodiment of the present invention.
Specific embodiment
Below in conjunction with drawings and Examples, specific embodiment of the 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
It is only descriptive purpose to apply example, rather than limitation of the present invention.
As shown in figure 1, the present invention proposes that a kind of top gas of reduction shaft furnace production sponge iron utilizes technique, main technique
For：Charge preheating tank 2 is passed directly into from the top gas out of shaft furnace 1, the top gas for going out furnace charge preheating can 2 is then removed by cooling
Mix with part coke-stove gas or natural gas after dirt, dehydration, decarburization and be passed through shaft furnace cooling section, from the high temperature of cooling section outlet discharge
Cooling gas is passed through furnace charge prereduction tank 3 and iron ore is reduced, and mixes with coke-stove gas as reformation gas by treatment afterwards
Be passed through in stove reformed, reduced, carburization reaction.
The top gas of reduction shaft furnace production sponge iron proposed by the present invention mainly includes preheating can 2, scrubbing tower using system
4th, dehydrator 5, decarbonization system 6, cooling gas input pipe, cooling gas discharge pipe and prereduction tank 3.
The preheating can 2, scrubbing tower 4, dehydrator 5 and decarbonization system 6 are sequentially connected located at the outside of reduction shaft furnace 1, institute
The preheating gas entrance for stating preheating can 2 connects the top gas outlet of the reduction shaft furnace 1.
The cooling gas input pipe and cooling gas discharge pipe are sequentially arranged in the bottom cooling of the reduction shaft furnace 1 from top to bottom
It is connected inside cooling section described in Duan Bingyu；The cooling gas that the entrance of the cooling gas input pipe connects the decarbonization system 6 goes out
Mouthful.
The prereduction tank 3 located at the reduction shaft furnace 1 outside, the prereduction gas access of the prereduction tank 3 with
The outlet connection of the cooling gas discharge pipe.
Processing technological flow specific implementation of the present invention to the top gas of reduction shaft furnace 1 is as described below.
Shaft furnace top gas is directly entered charge preheating tank 2 after being discharged by furnace roof, cold conditions pelletizing in tank is dried and in advance
Heat.
The top gas discharged by charge preheating tank 2 carries out cooling dedusting into scrubbing tower 4.
Compressor 7 is also associated between the dehydrator 5 and decarbonization system 6.
It is dehydrated into dehydrator 5 by the coal gas after dedusting of lowering the temperature, then passes through after compressor 6 pressurizes and enter decarburization
The decarburization of system 6, CO in the decarbonization gas after decarburization2Volume content≤1%, H2Volume content≤2% of O.
Compression system 8 is connected between the cooling gas input pipe and the decarbonization system 6, the compression system is also connected with
Coke-stove gas or natural gas line.
By the stock gas after decarburization as cooling gas, pressurized system 8 is pressurized to and meets cooling section inlet pressure model
In enclosing, mix with appropriate coke-stove gas or natural gas and be passed directly into stove, cooling down high-temperature sponge iron.
(prereduction tank 3) in the tank after preheating where iron ore is passed directly into from the High-temperature cooling gas of cooling section discharge, to iron
Ore carries out prereduction.
The system also includes the heat exchanger 9, dehydration equipment 10, the second compressor 11, the CO2 remover 12 that are sequentially connected
With heater 13, the heat exchanger 9 is connected with the gas exit of the prereduction tank 3；The gas access of the heater 13
It is also connected with pressurize coke-stove gas or natural gas line；Intersect connection with oxygen channel in the mixture output tube road of the heater 13
It is connected with the also Primordial Qi entrance of the reduction shaft furnace 1 afterwards.When oxygen supplier is connected with mixture output tube road, oxygen will can be more carefully sprayed
The center in pipe insertion mixture output tube road.
Coal gas from the discharge of prereduction tank 3 carries out decarburization after the pressurizing through over-heat-exchanger 9 and dehydration equipment 10, obtains
To decarbonization gas mix with pressurization coke-stove gas or natural gas after be passed through heater 13 and heated up.
Entering to add a certain amount of oxygen in the pipeline of stokehold by the gaseous mixture after intensification, carrying out partial oxidative steam reforming, and carry
Mixture temperature high.Gaseous mixture carries out, from reforming, producing and being rich in CO and H in stove2Also Primordial Qi, with this to the iron ore in stove
Stone is reduced.
The fuel inlet of the heater 13 can connect the gas exit of the dehydration equipment 10.
Wherein the fuel used part of heater 13 can be from after the discharge of prereduction tank by the coal gas of heat exchange dehydration, another portion
Fuel is divided to be coke-stove gas or natural gas.
In said process, stock gas may include three retort groups to the preheating of iron ore and prereduction technique, respectively
It is cold burden tank 14, preheating can 2, prereduction tank 3.Also Primordial Qi is from up to down to pass through retort fixed bed stock column.This 3 reactions
Tank is operated by the way of alternate cycles, and the cold burden tank 14 after the completion of charging can be changed into preheating can 2, and former preheating can 2
Can then be changed into cold burden tank as prereduction tank 3, the prereduction tank 3 after the completion of reduction after the completion of being preheated by stock gas
14。
The top gas of above-mentioned reduction shaft furnace 1 proposed by the present invention utilizes system and method, energy using the top gas that technique is included
Enough iron ore is dried and preheated using high temperature furnace top gas, the top gas after the completion of preheating is again by cooling dedusting, dehydration
Pressurization afterwards enters decarbonization system removing CO2.Decarbonization gas are passed through reduction shaft furnace cooling consequently as the cooling gas of high-temperature sponge iron
Section, the high temperature furnace top gas for completing cooling procedure is then used for reducing the iron ore after preheating, by the furnace roof after the completion of reduction
Gas is passed through shaft furnace after mixing and preheat with natural gas/coke-stove gas, is carried out from reformation as catalyst by the sponge iron after reduction
Generation CO and H2, and then reducing iron ore.
Compared with prior art, the present invention can make full use of high temperature in the sensible heat and shaft furnace cooling section of shaft furnace top gas
Sponge iron sensible heat, CO+H is obtained after decarburization dehydration2Content coal gas higher can realize the prereduction to iron ore, can be had
There is the furnace charge of uniform temperature and percent reduction, the furnace charge hot charging enters stove can reduce the consumption of furnace reduction gas.
The final coal gas after the reaction of prereduction tank terminates is reformed to flow back with unstripped gas and participates in the anti-of reduction shaft furnace iron ore
Should, the also Primordial Qi that the identical iron ore of reduction unit mass needs is saved, reduce the air consumption of shaft furnace.
In a word, the present invention can make full use of high temperature furnace top gas contained by heat energy ore is preheated, and can utilize cold
CO, H in the heat energy and coal gas of the top gas after but2Reducing gas carries out prereduction to the iron ore after preheating.It is of the invention
It is this make iron ore preheated with prereduction after shaft furnace hot charging pelletizing process can reduce shaft furnace energy consumption, realize shaft furnace ironmaking technology
Low-carbon (LC) and environmental protection produce.Additionally, the present invention further using in shaft furnace from reforming technique, it is to avoid the investment of External reforming stove
With the consumption costs of the precious metal catalyst such as Ni bases.
Embodiment 1
The present embodiment carries out shaft furnace reduction of iron ore, composition after coke-stove gas refining desulfurization by unstripped gas of coke-stove gas
For：60%H2, 8%CO, 27%CH4, 4%C2+, 2%CO2, 2%N2, 0.5%O2.350-400 DEG C of shaft furnace top gas composition
For：32.6%H2, 12.2%CO, 12.6%CH4, 9.7%CO2, 9.3%N2, 23.6%H2O, directly enters after being discharged through blast pipe
Enter iron ore pellets preheating can, iron ore pellets are preheated.As shown in figure 1, coal gas outlet temperature after charge preheating tank 2
It is 150 DEG C, subsequently enters temperature-reduction dust-removal system such as scrubbing tower 4 and be cooled to 40 DEG C or so, dustiness is down to 500mg/m3.After dedusting
Coal gas be dehydrated through dehydrator 5, then by compressor 7 pressurization after enter decarbonization system 6 such as MDEA solution carry out carbonization treatment, obtain
It is to decarburization gas componant：47.4%H2, 17.7%CO, 18.3%CH4, 1%CO2, 13.5%N2, 2%H2O。
Decarbonization gas mix with coke-stove gas after as bottom sponge iron cooling gas, wherein coke-stove gas proportion is
20%, the cooling gas input pipe for cooling down pars infrasegmentalis by shaft furnace 1 is passed through in stove, is equably blown into by distributor in stove, to upstream
With high-temperature sponge iron heat convection while dynamic, cooling gas discharge pipe is entered finally by the collecting hood for being installed in cooling section top
Discharge out of the furnace.At 550 DEG C or so, furnace charge is 5h in the residence time of cooling section to outlet cooling temperature degree.
550 DEG C or so of outlet coal gas is then passed through the preheating can 2 that prereduction tank 3 has finished warming up furnace charge, profit
With CO and H in coal gas2Reducing iron ore, the degree of metalization of iron ore can reach 20% or so after prereduction.Complete to be gone back to pre-
The coal gas of furnace charge reduction carries out energy recovery, by-product low-pressure steam or hot water into heat exchange of heat pipe 9 in former tank 3.Then pass through
Dehydrator 10 is dehydrated and carries out decarburization into decarbonization system 12 after pressurizeing and obtains circulating top gas, and composition is：45.6%H2、
18.1%CO, 21.5%CH4, 1%CO2, 11.8%N2, 2%H2O。
Circulation stock gas first passes through humidifier 15 after mixing with coke-stove gas makes H2O% controls 16% or so, afterwards
Gaseous mixture after humidification is passed through in heater 13 and is preheated to 900 DEG C or so.Entering stokehold, oxygen is being injected in reduction feed channel
Gas, 1050 DEG C or so are risen to by mixture temperature, and gaseous mixture occurs reduction, reforms and carburization reaction after entering stove, obtains certain
The degree of metalization of phosphorus content is 92% high-quality sponge iron.
Embodiment 2
The present embodiment carries out shaft furnace reduction of iron ore, composition after coke-stove gas refining desulfurization by unstripped gas of coke-stove gas
For：60%H2, 8%CO, 27%CH4, 4%C2+, 2%CO2, 2%N2, 0.5%O2.350-400 DEG C of shaft furnace top gas composition
For：32.6%H2, 12.2%CO, 12.6%CH4, 9.7%CO2, 9.3%N2, 23.6%H2O, directly enters after being discharged through blast pipe
Enter iron ore pellets preheating can, iron ore pellets are preheated.As shown in figure 1, coal gas outlet temperature after charge preheating tank 2
It is 150 DEG C, subsequently enters temperature-reduction dust-removal system such as scrubbing tower 4 and be cooled to 40 DEG C or so, dustiness is down to 500mg/m3.After dedusting
Coal gas be dehydrated through dehydrator 5, then by compressor 7 pressurization after enter decarbonization system 6 such as MDEA solution carry out carbonization treatment, obtain
It is to decarburization gas componant：47.7%H2, 17.8%CO, 18.4%CH4, 0.8%CO2, 13.6%N2, 1.7%H2O。
Decarbonization gas mix with coke-stove gas after as bottom sponge iron cooling gas, wherein coke-stove gas proportion is
25%, the cooling gas input pipe for cooling down pars infrasegmentalis by shaft furnace 1 is passed through in stove, is equably blown into by distributor in stove, to upstream
With high-temperature sponge iron heat convection while dynamic, cooling gas discharge pipe is entered finally by the collecting hood for being installed in cooling section top
Discharge out of the furnace.At 550 DEG C or so, furnace charge is 5h in the residence time of cooling section to outlet cooling temperature degree.
550 DEG C or so of outlet coal gas is then passed through the preheating can 2 that prereduction tank 3 has finished warming up furnace charge, profit
With CO and H in coal gas2Reducing iron ore, the degree of metalization of iron ore can reach 20% or so after prereduction.Complete to be gone back to pre-
The coal gas of furnace charge reduction carries out energy recovery, by-product low-pressure steam or hot water into heat exchange of heat pipe 9 in former tank 3.Then pass through
Dehydrator 10 is dehydrated and carries out decarburization into decarbonization system 12 after pressurizeing and obtains circulating top gas, and composition is：46.7%H2、
17.4%CO, 22.0%CH4, 1.0%CO2, 10.9%N2, 2%H2O。
Circulation stock gas first passes through humidifier 15 after mixing with coke-stove gas makes H2O% controls 16% or so, afterwards
Gaseous mixture after humidification is passed through in heater 13 and is preheated to 900 DEG C or so.Entering stokehold, oxygen is being injected in reduction feed channel
Gas, 1050 DEG C or so are risen to by mixture temperature, and gaseous mixture occurs reduction, reforms and carburization reaction after entering stove, obtains certain
The degree of metalization of phosphorus content is 92% high-quality sponge iron.
Embodiment 3
The present embodiment carries out shaft furnace reduction of iron ore, composition after coke-stove gas refining desulfurization by unstripped gas of coke-stove gas
For：60%H2, 8%CO, 27%CH4, 4%C2+, 2%CO2, 2%N2, 0.5%O2.350-400 DEG C of shaft furnace top gas composition
For：32.6%H2, 12.2%CO, 12.6%CH4, 9.7%CO2, 9.3%N2, 23.6%H2O, directly enters after being discharged through blast pipe
Enter iron ore pellets preheating can, iron ore pellets are preheated.As shown in figure 1, coal gas outlet temperature after charge preheating tank 2
It is 150 DEG C, subsequently enters temperature-reduction dust-removal system such as scrubbing tower 4 and be cooled to 40 DEG C or so, dustiness is down to 500mg/m3.After dedusting
Coal gas be dehydrated through dehydrator 5, then by compressor 7 pressurization after enter decarbonization system 6 such as MDEA solution carry out carbonization treatment, obtain
It is to decarburization gas componant：47.8%H2, 17.9%CO, 18.5%CH4, 0.7%CO2, 13.6%N2, 1.5%H2O。
Decarbonization gas mix with coke-stove gas after as bottom sponge iron cooling gas, wherein coke-stove gas proportion is
30%, the cooling gas input pipe for cooling down pars infrasegmentalis by shaft furnace 1 is passed through in stove, is equably blown into by distributor in stove, to upstream
With high-temperature sponge iron heat convection while dynamic, cooling gas discharge pipe is entered finally by the collecting hood for being installed in cooling section top
Discharge out of the furnace.At 550 DEG C or so, furnace charge is 5h in the residence time of cooling section to outlet cooling temperature degree.
550 DEG C or so of outlet coal gas is then passed through the preheating can 2 that prereduction tank 3 has finished warming up furnace charge, profit
With CO and H in coal gas2Reducing iron ore, the degree of metalization of iron ore can reach 20% or so after prereduction.Complete to be gone back to pre-
The coal gas of furnace charge reduction carries out energy recovery, by-product low-pressure steam or hot water into heat exchange of heat pipe 9 in former tank 3.Then pass through
Dehydrator 10 is dehydrated and carries out decarburization into decarbonization system 12 after pressurizeing and obtains circulating top gas, and composition is：47.6%H2、
16.9%CO, 22.8%CH4, 1%CO2, 9.7%N2, 2%H2O。
Circulation stock gas first passes through humidifier 15 after mixing with coke-stove gas makes H2O% controls 16% or so, afterwards
Gaseous mixture after humidification is passed through in heater 13 and is preheated to 900 DEG C or so.Entering stokehold, oxygen is being injected in reduction feed channel
Gas, 1050 DEG C or so are risen to by mixture temperature, and gaseous mixture occurs reduction, reforms and carburization reaction after entering stove, obtains certain
The degree of metalization of phosphorus content is 92% high-quality sponge iron.
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 implementation method.For those of ordinary skill in the field, can also do on the basis of the above description
Go out the change or variation of other multi-forms.There is no need and unable to be exhaustive to all of implementation method.And thus drawn
Obvious change that Shen goes out or among changing still in protection scope of the present invention.
Claims (10)
1. a kind of top gas of reduction shaft furnace production sponge iron utilizes system, it is characterised in that the system includes preheating can, washes
Tower, dehydrator, decarbonization system, cooling gas input pipe, cooling gas discharge pipe and prereduction tank are washed, wherein,
The preheating can, scrubbing tower, dehydrator and decarbonization system are sequentially connected located at the outside of reduction shaft furnace, the preheating can
Preheating gas entrance connects the top gas outlet of the reduction shaft furnace；
The cooling gas input pipe and cooling gas discharge pipe are sequentially arranged in the bottom cooling section of the reduction shaft furnace simultaneously from top to bottom
It is connected with inside the cooling section；The entrance of the cooling gas input pipe connects the cooling gas outlet of the decarbonization system；
The prereduction tank is located at the outside of the reduction shaft furnace, prereduction gas access and the cooling of the prereduction tank
The outlet connection of gas discharge pipe.
2. top gas according to claim 1 utilizes system, it is characterised in that between the dehydrator and decarbonization system
It is also associated with compressor.
3. top gas according to claim 1 utilizes system, it is characterised in that the cooling gas input pipe and the decarburization
Compression system is connected between system, the compression system is also connected with coke-stove gas or natural gas line.
4. top gas according to claim 1 utilizes system, it is characterised in that the system also includes the heat being sequentially connected
Exchanger, dehydration equipment, the second compressor, CO2Remover and heater, the coal gas of the heat exchanger and the prereduction tank
Outlet is connected；The gas access of the heater is also connected with pressurize coke-stove gas or natural gas line；The mixing of the heater
Gas output channel is connected after intersecting connection with oxygen channel with the also Primordial Qi entrance of the reduction shaft furnace.
5. top gas according to claim 4 utilizes system, it is characterised in that the fuel inlet connection institute of the heater
State the gas exit of dehydration equipment.
6. a kind of top gas according to any one of claim 1 to 5 utilizes the top gas Application way of system, and its feature exists
In the described method comprises the following steps：
The top gas of reduction shaft furnace is passed through the preheating can, cold conditions pelletizing is dried and preheated；
The top gas that will be discharged from the preheating can sends into the scrubbing tower and carries out cooling dedusting；
By it is described cooling dedusting after top gas be dehydrated, decarburization；
The high-temperature sponge iron in reduction shaft furnace cooling section is cooled down using the decarbonization gas after the decarburization as cooling gas；
The High-temperature cooling gas discharged from the cooling section is passed through in the iron ore after preheating, pre- going back is carried out to the iron ore
It is former.
7. top gas Application way according to claim 6, it is characterised in that between the dehydration and decarbonation process also
The top gas is pressurizeed, CO in the decarbonization gas after decarburization2Volume content≤1%, H2The volume content of O≤
2%.
8. top gas Application way according to claim 6, it is characterised in that the decarbonization gas after decarburization are high in cooling
Also include step before warm sponge iron：By the decarbonization gas it is pressurized after mix with coke-stove gas or natural gas.
9. top gas Application way according to claim 6, it is characterised in that methods described also includes：Will it is described it is pre- also
Coal gas after original is heated by mixing with pressurization coke-stove gas or natural gas after heat exchange, dehydration, pressurization, decarburization, is heated
High-temperature gas mixture afterwards is passed through and reforming reaction is carried out in shaft furnace, and generation also Primordial Qi is reduced to iron ore in stove.
10. top gas Application way according to claim 9, it is characterised in that preheating fuel is included from described
By heat exchange and the coal gas being dehydrated after prereduction discharge.
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| CN111593157A (en) * | 2019-02-21 | 2020-08-28 | 丹尼尔和科菲森梅克尼齐有限公司 | Direct reduction apparatus and associated process |
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| CN113528723A (en) * | 2021-07-07 | 2021-10-22 | 山西晋南钢铁集团有限公司 | Method for utilizing residual coke oven gas during overhauling period of toughening co-production of ethylene glycol |
| CN113913579A (en) * | 2021-10-12 | 2022-01-11 | 中冶赛迪工程技术股份有限公司 | Circulation method for cooling hot sponge iron |
| CN114959153A (en) * | 2022-06-14 | 2022-08-30 | 中冶赛迪工程技术股份有限公司 | Process for producing direct reduced iron by hydrogen-rich shaft furnace |
| CN117568547A (en) * | 2023-10-27 | 2024-02-20 | 攀钢集团西昌钢钒有限公司 | Ore hot-charging composite blowing gas-based direct reduction iron-making method and device |
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