CN104087700B - Method and system for preparing sponge iron by using gas-based shaft furnace - Google Patents
Method and system for preparing sponge iron by using gas-based shaft furnace Download PDFInfo
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- CN104087700B CN104087700B CN201410345209.1A CN201410345209A CN104087700B CN 104087700 B CN104087700 B CN 104087700B CN 201410345209 A CN201410345209 A CN 201410345209A CN 104087700 B CN104087700 B CN 104087700B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 81
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 74
- 239000007789 gas Substances 0.000 claims abstract description 207
- 238000006722 reduction reaction Methods 0.000 claims abstract description 100
- 238000001816 cooling Methods 0.000 claims abstract description 78
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 69
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 69
- 239000001257 hydrogen Substances 0.000 claims abstract description 40
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 40
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 230000008569 process Effects 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 238000005261 decarburization Methods 0.000 claims abstract description 13
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 13
- 239000008188 pellet Substances 0.000 claims abstract description 12
- 238000007906 compression Methods 0.000 claims abstract description 7
- 230000006835 compression Effects 0.000 claims abstract description 7
- 230000009467 reduction Effects 0.000 claims description 71
- 230000023556 desulfurization Effects 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 5
- 229910002090 carbon oxide Inorganic materials 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 24
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 238000002156 mixing Methods 0.000 abstract description 6
- 238000011282 treatment Methods 0.000 abstract description 6
- 150000002431 hydrogen Chemical class 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- 239000000112 cooling gas Substances 0.000 description 26
- 238000004519 manufacturing process Methods 0.000 description 17
- 238000005255 carburizing Methods 0.000 description 10
- 230000008676 import Effects 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 230000002349 favourable effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000007233 catalytic pyrolysis Methods 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 2
- 238000005201 scrubbing Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Manufacture Of Iron (AREA)
Abstract
The invention discloses a method for preparing sponge iron by using a gas-based shaft furnace. The method comprises the following steps of (1) adding an oxidized pellet into the gas-based shaft furnace, wherein the gas-based shaft furnace is provided with a reducing section and a cooling section; (2) carrying out hydrogen extraction treatment on first reducing gas to obtain hydrogen and carbon monoxide enriched gas; (3) mixing second reducing gas and hydrogen, and carrying out heat treatment to obtain heat-state reducing gas; (4) delivering the heat-state reducing gas into the reducing section, and enabling the heat-state reducing gas and the oxidized pellet to be subjected to reduction reaction to obtain sponge iron and top gas; (5) delivering the carbon monoxide enriched gas into the cooling section to ensure that the carbon monoxide enriched gas upwards enters the reducing section after being subjected to heat exchange and carburization reaction with the sponge iron in the cooling section; (6) sequentially and respectively carrying out washing and cooling treatment, compression treatment as well as desulfuration and decarburization treatment on the top gas to obtain unreacted reducing gas; and (7) mixing the unreacted reducing gas and the second reducing gas. By using the method, the energy consumption of a direct reducing process of the gas-based shaft furnace can be effectively reduced.
Description
Technical field
The present invention relates to metallurgical technology field, specifically, the present invention relates to the method that gas-based shaft kiln prepares sponge iron.
Background technology
Sponge iron is that instead of steel scrap and better than the steelmaking feed of steel scrap, can dilute impurity element components in steel scrap, is electric furnace
Steel-making provides requisite pure iron material, and then provides the casting of high-quality base for high-end equipment Manufacturing production staple product
Part, is the important raw and processed materials for developing equipment manufacture.
At present, in the world more than 75% sponge iron is produced using gas-based shaft kiln method, wherein typical technique is MIDREX
Technique, (Energiron) techniques of HYL III and PERED techniques.The discharge method of sponge iron has two kinds, i.e., hot discharging production hot pressing
Block (HBI) and hot sponge iron (HDRI), and cold discharging production cold conditions sponge iron (CDRI).The product of heat discharging is only suitable for directly
Reduction ironworks and electric furnace factory are connect apart from close large-scale synthesis iron and steel enterprise, and most direct-reduction factories do not possess this bar
Part, therefore the cold discharging of product needed, it is to avoid sponge iron is reoxidized, to ensure the quality of sponge iron.This method is taken in shaft furnace
Bottom cooling section is passed through cooling gas, sponge iron is cooled to into less than 50 DEG C and is then exhausted from.Simultaneously carburizing is carried out in cooling section, to subtract
The energy consumption burden of light molten subdivision.
Shaft furnace cooling section realizes cooling for sponge iron by cooling down the equipment such as scrubbing tower and compressor.Room temperature it is natural
Gas and circulation cooled coal gas mixing, Jing compressor pressurization after enter cooling section bottom, in gas uphill process with from top to bottom transport
Dynamic sponge iron carries out heat exchange, and carries out carburization reaction.Then, the cooling gas of sponge iron heat is absorbed by cooling section top
Exclude, Jing after cooling scrubbing tower, mix with supplementary natural gas, be again introduced into cooling down pars infrasegmentalis Jing after compressor pressurization, formed
Cooling gas partial circulating.This method has four：(1) because reducing gas enters shaft furnace from reduction section bottom, and sponge
The sensible heat of ferrum is not obtained by, therefore also Primordial Qi firing equipment scale is big, high energy consumption.(2) reducing gas is from reduction section bottom
Bustle pipe enters shaft furnace, and reducing gas is difficult to reach shaft furnace center, and reduction air flow method is uneven.(3) element sulphur in iron ore
Shaft furnace top gas is easily accessible, recycling shaft furnace top gas needs to add desulfurizer.(4) due to H in circulating cooling gas2/
The value of carbon monoxide is higher, and than relatively low, carburizing sponge iron effect is not very good to carbon monoxide content in gas.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.For this purpose, the present invention
One purpose is to propose a kind of method that gas-based shaft kiln prepares sponge iron.Gas base can be effectively reduced using the method and system
The energy consumption of Shaft Furnace Direct Reduction Process, makes also Primordial Qi air flow method and uniformity of temperature profile, mitigates shaft furnace top gas desulphurization plant
Burden, increase the carburizing amount of sponge iron, reduce several in the existing gas-based shaft kiln directly reduced techniques such as the energy consumption of molten division technique
Big subject matter.
According to an aspect of the present invention, the present invention proposes a kind of method that gas-based shaft kiln prepares sponge iron, including：
(1) acid pellet is added into the gas-based shaft kiln, wherein, the gas-based shaft kiln has reduction section and cooling section,
The reduction section is located at the top of the cooling section；
(2) the first reducing gas is carried out proposing hydrogen process, to obtain hydrogen and rich CO (carbon monoxide converter) gas；
(3) the second reducing gas and the hydrogen are mixed and are carried out heat treated, to obtain hot also Primordial Qi；
(4) the hot also Primordial Qi is delivered in the gas-based shaft kiln from the reduction section, make the hot also Primordial Qi with
There is reduction reaction in the acid pellet, to obtain sponge iron and top gas；
(5) the rich CO (carbon monoxide converter) gas are delivered in the gas-based shaft kiln from the cooling section, to make the richness
CO (carbon monoxide converter) gas carry out being upwardly into the reduction after heat exchange and carburization reaction with the sponge iron in the cooling section
Section simultaneously carries out the reduction reaction；
(6) top gas is carried out respectively successively wash cooling process, compression to process and desulfurization and decarburization process, so as to
To unreacted also Primordial Qi；
(7) before step (3) is carried out, by the described unreacted also Primordial Qi obtained in step (6) and described second
Reducing gas mixes.
Therefore, the method for preparing sponge iron using the above embodiment of the present invention gas-based shaft kiln can effectively reduce gas-based shaft kiln
The energy consumption of direct-reduction technique, makes also Primordial Qi air flow method and uniformity of temperature profile, mitigates the negative of shaft furnace top gas desulphurization plant
Load, increases the carburizing amount of sponge iron, reduces several big master in the existing gas-based shaft kiln directly reduced techniques such as the energy consumption of molten division technique
Want problem.
In addition, the method that gas-based shaft kiln according to the above embodiment of the present invention prepares sponge iron can also have following adding
Technical characteristic：
In some embodiments of the invention, carbon monoxide contains in the described rich CO (carbon monoxide converter) gas for obtaining in step (2)
Amount is not less than 70 volumes %.
In some embodiments of the invention, the described rich CO (carbon monoxide converter) gas of the reduction section are entered in step (5)
Temperature is 850～900 degrees Celsius.It is possible thereby to being directly entered reduction section carries out reduction reaction, can also improve in reduction section
Air temperature and current distribution consistency degree, improve product quality.
In some embodiments of the invention, the temperature of the described hot also Primordial Qi for obtaining in step (3) is 900～1000
Degree Celsius.Thus also Primordial Qi is heated to 1050～1200 degrees Celsius and more saves energy consumption by more traditional needs.
In some embodiments of the invention, in step (5) by the rich CO (carbon monoxide converter) gas from the cooling section
Neighbouring bottom is delivered in the gas-based shaft kiln.It is possible thereby to further improve to be fully contacted with sponge iron, fully to enter
Row heat exchange and carburization reaction.
According to a further aspect in the invention, the invention allows for a kind of gas-based shaft kiln system for preparing sponge iron, including：
Gas-based shaft kiln, the gas-based shaft kiln has the outlet of charging aperture, discharge gate and top gas, and the gas-based shaft kiln has also
Former chamber and the cooling chamber below the reduction chamber, wherein, the reduction chamber has also Primordial Qi import, described cold
But chamber has cooling gas import；
Hydrogen production device is carried, there are the hydrogen production device that carries air inlet, hydrogen outlet and rich CO (carbon monoxide converter) gas to export, described rich one
Carbon oxide gas outlet is connected with the cooling gas import of the cooling chamber；
Heating furnace, the heating furnace be arranged on it is described carry between hydrogen production device and the gas-based shaft kiln, and respectively with the hydrogen
Gas is exported and is connected with the also Primordial Qi import of the reduction chamber；
Wash cooling device, the wash cooling device is connected with top gas outlet；
Compressor, the compressor is connected with the wash cooling device；And
Desulfurization and decarburization device, the desulfurization and decarburization device is connected respectively with the compressor and the heating furnace.
Therefore, the system for preparing sponge iron using the above embodiment of the present invention gas-based shaft kiln can effectively reduce gas-based shaft kiln
The energy consumption of direct-reduction technique, makes also Primordial Qi air flow method and uniformity of temperature profile, mitigates the negative of shaft furnace top gas desulphurization plant
Load, increases the carburizing amount of sponge iron, reduces several big master in the existing gas-based shaft kiln directly reduced techniques such as the energy consumption of molten division technique
Want problem.Top gas can also be made full use of simultaneously, reduce the use of reducing gas, reducing energy consumption.
In some embodiments of the invention, the cooling gas import is adjacent to the bottom of the cooling chamber.It is possible thereby to
Fully sponge iron is cooled down.
Description of the drawings
Fig. 1 is the flow chart of the method that gas-based shaft kiln according to an embodiment of the invention prepares sponge iron.
Fig. 2 is the structure chart of the system that gas-based shaft kiln according to an embodiment of the invention prepares sponge iron.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
The method that the gas-based shaft kiln for describing the embodiment of the present invention below with reference to Fig. 1 prepares sponge iron.Reality of the invention
The gas-based shaft kiln for applying example prepares the method for sponge iron and includes：
(1) acid pellet is added into the gas-based shaft kiln, wherein, gas-based shaft kiln has reduction section and cooling section, reduction
Section is located at the top of cooling section；
(2) the first reducing gas is carried out proposing hydrogen process, to obtain hydrogen and rich CO (carbon monoxide converter) gas；
(3) the second reducing gas and hydrogen are mixed and are carried out heat treated, to obtain hot also Primordial Qi；
(4) hot also Primordial Qi is delivered in gas-based shaft kiln from reduction section, hot also Primordial Qi is reduced with acid pellet
Reaction, to obtain sponge iron and top gas；
(5) rich CO (carbon monoxide converter) gas are delivered in gas-based shaft kiln from cooling section, so as to make rich CO (carbon monoxide converter) gas with it is cold
But the sponge iron in section carries out being upwardly into reduction section after heat exchange and carburization reaction and carries out reduction reaction；
(6) top gas is carried out respectively successively wash cooling process, compression to process and desulfurization and decarburization process, so as to
To unreacted also Primordial Qi；
(7) before step (3) is carried out, by the described unreacted also Primordial Qi obtained in step (6) and described second
Reducing gas mixes.
First, the present invention will reducing gas be carried out carrying hydrogen process the rich CO (carbon monoxide converter) gas that obtain as cooling gas from
The neighbouring bottom of cooling section is delivered in gas-based shaft kiln, while the rich CO (carbon monoxide converter) gas being preheated are entered in reduction section for also
Original reaction.Because the carbon monoxide content in rich CO (carbon monoxide converter) gas is higher, according to a particular embodiment of the invention, rich one aoxidizes
Carbon monoxide content is not less than 70 volumes % in carbon gas, and the specific heat capacity of carbon monoxide is H21/10th, therefore cool down
More preferably, CO (carbon monoxide converter) gas are easier to be preheated effect.On the other hand, rich CO (carbon monoxide converter) gas in cooling section further with sea
There is carburization reaction in continuous ferrum, the carburization reaction of carbon monoxide is exothermic reaction, is more favorable for the preheating of cooling gas.Therefore, it is cold
But in shaft furnace cooling section Jing after thermal sponge iron preheating, temperature takes full advantage of hot sponge iron to gas up to 850～900 DEG C
Sensible heat, is that energy consumption is saved in whole technological process.Because the temperature after cooling gas preheating is high, hydrogen-rich also Primordial Qi only need to be heated to
900～1000 DEG C, it is possible to form the temperature field that acid pellet reduction is required in reduction shaft furnace section, further reduce whole work
The energy consumption of skill flow process.Another further aspect, 850 can be reached due to the temperature of the rich CO (carbon monoxide converter) gas preheated through sponge iron～
900 DEG C, hence into can directly carry out reduction reaction after reduction section.And rich CO (carbon monoxide converter) gas are from the little cooling section of diameter
Into reduction section, the reduction section central area that hot also Primordial Qi is difficult to reach can be reached, it is possible thereby to make temperature in reduction section
It is evenly distributed, air flow method is uniform, is more favorable for the control of product quality.
Secondly as being more favorable for sponge in cooling section as the cooling gas of cooling section using rich CO (carbon monoxide converter) gas
There is carburization reaction in ferrum, therefore can significantly improve the carbon content of sponge iron so as to disclosure satisfy that higher carbon containing requirement, so as to
Reduce molten point of follow-up processing load, reducing energy consumption.It is of the invention to be embodied as, by rich carbon monoxide in step (5)
Gas is delivered in the gas-based shaft kiln from the neighbouring bottom of cooling section.It is possible thereby to fully contact generation carburizing with sponge iron
Reaction, while reducing the problem of sponge iron, improves the temperature of carbon monoxide itself.
3rd, as the cooling gas of cooling section, improving sponge iron carbon content due to using rich CO (carbon monoxide converter) gas
Meanwhile, the carbon monoxides in more cooling gas are consumed, and then an oxygen of reducing gas in whole gas-based shaft kiln can be reduced
Change carbon content, while the catalytic action of metallic iron in cooling section can also be utilized, the methane gas in catalytic pyrolysiss cooling gas enters
And gas is reformed, further increase the H of the reducing gas in reduction section2/ CO ratios, it is final to improve reduction reaction effect
Rate.
Therefore, the method for preparing sponge iron using the above embodiment of the present invention gas-based shaft kiln can effectively reduce gas-based shaft kiln
The energy consumption of direct-reduction technique, makes also Primordial Qi air flow method and uniformity of temperature profile, mitigates the negative of shaft furnace top gas desulphurization plant
Load, increases the carburizing amount of sponge iron, reduces several big master in the existing gas-based shaft kiln directly reduced techniques such as the energy consumption of molten division technique
Want problem.
According to a particular embodiment of the invention, the first and second reducing gas in above-mentioned steps (2) and step (3) can be with
For the reformation gas and coal gas of natural gas, coke-stove gas or coal bed gas, H therein2It is not low with the total content of carbon monoxide
In 90 volumes %.Thus using the reducing gas can further reduction reaction efficiency, so that further raising prepares spongy body
Efficiency and yield.According to a particular embodiment of the invention, carry out first in reduction section reduction reaction for heating after
The hot reduction gas of mixing containing the second reducing gas and hydrogen, hydrogen therein is higher with carbon monoxide ratio, it is possible thereby to
Further improve reduction reaction efficiency.The rich CO (carbon monoxide converter) gas for obtaining through proposing hydrogen process initially enter cooling section simultaneously after,
Carburization reaction occurs with sponge iron can consume part carbon monoxide, and carburization reaction and the high temperature carbon monoxide after preheating occur can be to
Further reduction gas hot with the mixing containing the second reducing gas and hydrogen mixes again and is reduced in upper entrance reduction section
Reaction, because carburization reaction consumes the carbon monoxide of a part, and then causes to eventually enter in the total also Primordial Qi in reduction section
H2With the total content of carbon monoxide on the premise of 90 volumes % are not less than so that H2/ CO ratios are also improved, Jin Ergeng
Plus it is favorably improved reduction reaction efficiency.
According to a particular embodiment of the invention, in step (3), only the second reducing gas and hydrogen need to be mixed and is carried out
It is heated to 900～1000 degrees Celsius and obtains hot also Primordial Qi, and is traditionally used for the temperature of the also Primordial Qi of gas-based shaft kiln reduction reaction
Degree needs to reach 1050～1200 degrees Celsius of even more highs, therefore the gas-based shaft kiln of the above embodiment of the present invention prepares sponge iron
Method more saves energy consumption.This is that the temperature of the rich CO (carbon monoxide converter) gas due to preheating through sponge iron can reach 850～900
DEG C, not only enter and can directly carry out after reduction section reduction reaction, and rich CO (carbon monoxide converter) gas are entered from the little cooling section of diameter
Enter reduction section, the reduction section central area that hot also Primordial Qi is difficult to reach can be reached, it is possible thereby to make temperature point in reduction section
Cloth is uniform, and air flow method is uniform, and reduction reaction is easier to make for, therefore the temperature of the hot also Primordial Qi of reduction section need not be too high,
And then save significantly on energy consumption.And traditional also Primordial Qi is that the center for being difficult to reach reduction section is entered from gas-based shaft kiln reduction section
Domain, is easily caused reaction not exclusively, and product quality is wayward, it is therefore desirable to be heated to more than 1000 degrees Celsius to improve reduction
The extent of reaction.
As shown in figure 1, according to a particular embodiment of the invention, above-mentioned gas-based shaft kiln is prepared in the method for sponge iron：
(6) top gas obtained in step (4) is carried out respectively successively wash cooling process, compression to process and desulfurization and decarburization
Process, to obtain unreacted also Primordial Qi.
(7) before step (3) is carried out, by the unreacted also Primordial Qi obtained in step (6) and the second reducing gas
Mixing.
Thus top gas is made full use of, it is to avoid waste unreacted reducibility gas.Additionally, by top gas
The control of decarburization link, makes carbon dioxide eliminating rate be 85%～95%, and shaft furnace cooling section can be avoided to analyse carbon in a large number and cause
Pelletizing pulverizing problem, and reduce gas pressure and absorb inner-tower filling material height, reduce production cost.
According to a particular embodiment of the invention, the temperature for compressor normal work, after the scrubbed cooling treatment of top gas
Spend for less than 50 degrees Celsius.Usual first and second reducing gas temperature is also less than 50 degrees Celsius.Therefore, into cooling section
Rich carbon monoxide gas temperature is also less than 50 degrees Celsius, and then the high-temperature sponge iron in cooling section can be cooled down.
According to a particular embodiment of the invention, the unreacted also Primordial Qi obtained in above-mentioned top gas can also be used for gas
Base shaft furnace prepares sponge iron.Specifically, can unreacted also Primordial Qi fill in reduction section in either cooling section or respectively
Fill in reduction section and cooling section.
According to a further aspect in the invention, the present invention proposes the system that a kind of gas-based shaft kiln prepares sponge iron, joins below
Examine Fig. 2 and describe the gas-based shaft kiln of the embodiment of the present invention and prepare the system of sponge iron and include：Gas-based shaft kiln 100, carry hydrogen production device 200,
Heating furnace 300, wash cooling device 400, compressor 500 and desulfurization and decarburization device 600.
According to a particular embodiment of the invention, gas-based shaft kiln 100 has the outlet of charging aperture 101, discharge gate 102 and top gas
103, gas-based shaft kiln 100 has reduction chamber 110 and the cooling chamber 120 positioned at the lower section of reduction chamber 110, wherein, reduce chamber
There is also Primordial Qi import 104, cooling chamber to have cooling gas import 105 for room 110；Hydrogen production device 200 is carried with air inlet 201, hydrogen
Gas outlet 202 and rich CO (carbon monoxide converter) gas outlet 203, rich CO (carbon monoxide converter) gas export the cooling gas import of 203 and cooling chamber
105 are connected；And heating furnace 300 is arranged on and carries between hydrogen production device 200 and gas-based shaft kiln 100, and respectively with hydrogen outlet 202 and
The also Primordial Qi import 104 of reduction chamber is connected.
First, the system that gas-based shaft kiln according to the abovementioned embodiments of the present invention prepares sponge iron, can be first with carrying
Reducing gas is carried out carrying hydrogen and processes the rich CO (carbon monoxide converter) gas and hydrogen that obtain by hydrogen production device 200, and by rich CO (carbon monoxide converter) gas
It is delivered in gas-based shaft kiln from the neighbouring bottom of gas-based shaft kiln cooling section as cooling gas, the richness one being preheated in cooling section
Carbon oxide gas continue on for reduction reaction in reduction section.And carry hydrogen and process and obtain hydrogen and be then together heated with also Primordial Qi
The reduction reaction being used in reduction section afterwards.Because the specific heat capacity of carbon monoxide is H21/10th, therefore using carrying hydrogen production device
The rich CO (carbon monoxide converter) gas that process is obtained are more preferable as the cooling effect of cooling gas, while CO (carbon monoxide converter) gas are easily pre-
Heat.On the other hand, rich CO (carbon monoxide converter) gas also further can occur carburization reaction in cooling section with sponge iron, carbon monoxide
Carburization reaction is exothermic reaction, is more favorable for the preheating of cooling gas.Therefore, cooling gas are in shaft furnace cooling section Jing thermal sponge irons
After preheating, temperature takes full advantage of the sensible heat of hot sponge iron up to 850～900 DEG C, is that energy consumption is saved in whole technological process.
Because the temperature after cooling gas preheating is high, hydrogen-rich also Primordial Qi need to only be heated to 900～1000 DEG C, it is possible in reduction shaft furnace section
The temperature field that acid pellet reduction is required is formed, the energy consumption of whole technological process is further reduced.Another further aspect, due to passing through
The temperature of the rich CO (carbon monoxide converter) gas of sponge iron preheating can reach 850～900 DEG C, can directly carry out hence into after reduction section
Reduction reaction.And rich CO (carbon monoxide converter) gas are to enter reduction section from the little cooling section of diameter, hot also Primordial Qi can be reached not
The reduction section central area for easily reaching, it is possible thereby to make uniformity of temperature profile in reduction section, air flow method is uniform, is more favorable for producing
The control of quality.
Secondly, the rich CO (carbon monoxide converter) gas that obtain are processed as the cooling gas of cooling section using carrying hydrogen production device, it is more sharp
In cooling section there is carburization reaction in sponge iron, therefore can significantly improve the carbon content of sponge iron so as to disclosure satisfy that higher
Carbon containing require, so as to reduce a follow-up molten point of processing load, reducing energy consumption.
3rd, using carry hydrogen production device process obtain using rich CO (carbon monoxide converter) gas as cooling section cooling gas,
While improving sponge iron carbon content, the carbon monoxide in more cooling gas can be consumed, and then whole gas base can be reduced and be erected
The carbon monoxide content of the reducing gas in stove, while the catalytic action of metallic iron in cooling section, catalytic pyrolysiss can also be utilized
Methane gas in cooling gas, and then gas is reformed, further increase the H of the reducing gas in reduction section2/ CO ratios
Value, it is final to improve reduction reaction efficiency.
Therefore, the system for preparing sponge iron using the above embodiment of the present invention gas-based shaft kiln can effectively reduce gas-based shaft kiln
The energy consumption of direct-reduction technique, makes also Primordial Qi air flow method and uniformity of temperature profile, mitigates the negative of shaft furnace top gas desulphurization plant
Load, increases the carburizing amount of sponge iron, reduces several big master in the existing gas-based shaft kiln directly reduced techniques such as the energy consumption of molten division technique
Want problem.
As shown in Fig. 2 gas-based shaft kiln according to the above embodiment of the present invention prepares the wash cooling in the system of sponge iron
Device 400 is connected with top gas outlet 103, and the wash cooling device 400 of compressor 500 is connected, and compressor 500 takes off with desulfurization
Carbon device 600 is connected.It is possible thereby to carry out wash cooling process, compression to top gas respectively process and desulfurization and decarburization process, obtain
To unreacted also Primordial Qi.The top gas of the discharge from reduction section 110 can be purified and taken off from there through said apparatus
Sulfur carbonization treatment, and then obtain unreacted also Primordial Qi.According to a particular embodiment of the invention, can also be by desulfurization and decarburization device
The unreacted also Primordial Qi discharged prepares sponge iron for gas-based shaft kiln.
For example, according to a particular embodiment of the invention, desulfurization and decarburization device 600 is connected with heating furnace 300.And then can be by
Unreacted also Primordial Qi is delivered to after being heated in heating furnace 300 for the reduction reaction in reduction section.Thus stove is made full use of
Unreacted also Primordial Qi can save partial reduction gas in top gas, save energy consumption, reduces cost.
According to a particular embodiment of the invention, gas import 105 is cooled down adjacent to the bottom of cooling chamber 120.It is possible thereby to will
Rich CO (carbon monoxide converter) gas are entered as cooling gas from the neighbouring bottom of cooling chamber 120, it is possible thereby to enable sponge iron to fill
Divide ground to contact with carbon monoxide, improve cooling effect and carburizing effect.
Embodiment
As depicted in figs. 1 and 2, fresh reducing gas is divided into into two parts, a part carries hydrogen production device through gas, by this portion
Divide gas to be divided into hydrogen and rich CO (carbon monoxide converter) gas, hydrogen therein is together passed through into gas with another part of fresh reducing gas
Body heating furnace carries out being heated to 900～1000 degrees Celsius, then enters in reduction shaft furnace section from the bustle pipe of reduction shaft furnace section bottom
Reduction reaction is carried out with the acid pellet entered from shaft furnace top.Rich CO (carbon monoxide converter) gas from being passed through shaft furnace cooling section bottom, with
Hot sponge iron carries out heat exchange, and sponge iron is cooled to less than 50 DEG C in shaft furnace cooling section, while it is anti-to carry out carburizing
A part of carbon monoxide should be consumed.It is Celsius that this part richness CO (carbon monoxide converter) gas is heated to 850～900 in the cooling section of shaft furnace
Degree, and continue up and flow into reduction section, and the hydrogen-rich thermal reduction gas entered with bustle pipe in reduction section mixs, reduce jointly
Acid pellet, the rich CO (carbon monoxide converter) gas for entering reduction section from cooling section can reach the central area of reduction section, and then can be with
So that the air temperature and current in reduction section is evenly distributed, reduction reaction is easily carried out.
The top gas produced in reduction section is discharged from the outlet of shaft furnace top gas.The top gas of discharge is carried out at wash cooling
Unreacted also Primordial Qi is obtained after reason, compression are processed and desulfurization and decarburization is processed, unreacted also Primordial Qi is passed through in heating furnace, used
Reduction reaction in reduction section.Save the fresh reducing gas in part.
In describing the invention, it is to be understood that term " " center ", " longitudinal direction ", " horizontal ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description, rather than indicates or imply that the device or element of indication must
With specific orientation, with specific azimuth configuration and operation, therefore must be not considered as limiting the invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include one or more this feature.In describing the invention, " multiple " are meant that two or more,
Unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or it is integral；Can be that machinery connects
Connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements.For the ordinary skill in the art, can be according to concrete feelings
Condition understands above-mentioned term concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be with
It is the first and second feature directly contacts, or the first and second features are by intermediary mediate contact.And, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be arbitrary
Combine in an appropriate manner in individual or multiple embodiments or example.Additionally, in the case of not conflicting, the technology of this area
Personnel can be combined the feature of the different embodiments or example described in this specification and different embodiments or example
And combination.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (2)
1. a kind of method that gas-based shaft kiln prepares sponge iron, it is characterised in that include：
(1) acid pellet is added into the gas-based shaft kiln, wherein, the gas-based shaft kiln has reduction section and cooling section, described
Reduction section is located at the top of the cooling section；
(2) the first reducing gas is carried out proposing hydrogen process, to obtain hydrogen and rich CO (carbon monoxide converter) gas, wherein, described rich one
Carbon monoxide content is not less than 70 volumes % in carbon oxide gas；
(3) the second reducing gas and the hydrogen are mixed and are carried out heat treated, to obtain hot also Primordial Qi；
(4) the hot also Primordial Qi is delivered in the gas-based shaft kiln from the reduction section, make the hot also Primordial Qi with it is described
There is reduction reaction in acid pellet, to obtain sponge iron and top gas；
(5) the rich CO (carbon monoxide converter) gas are delivered in the gas-based shaft kiln from the cooling section, to make a rich oxygen
Changing carbon gas with the sponge iron in the cooling section carries out that the reduction section is upwardly into after heat exchange and carburization reaction simultaneously
Carry out the reduction reaction；
(6) top gas is carried out respectively successively wash cooling process, compression to process and desulfurization and decarburization process, to obtain not
The also Primordial Qi of reaction；
(7) before step (3) is carried out, the described unreacted also Primordial Qi obtained in step (6) is gone back into Primordial Qi with described second
Body mixes,
Wherein, the temperature in step (5) into the described rich CO (carbon monoxide converter) gas of the reduction section is 850～900 degrees Celsius,
The temperature of the described hot also Primordial Qi obtained in step (3) is 900～1000 degrees Celsius.
2. method according to claim 1, it is characterised in that by the rich CO (carbon monoxide converter) gas from institute in step (5)
The neighbouring bottom for stating cooling section is delivered in the gas-based shaft kiln.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104087699B (en) * | 2014-07-18 | 2017-05-03 | 北京神雾环境能源科技集团股份有限公司 | Method and system for preparing sponge iron by using gas-based shaft furnace |
| CN104451017B (en) * | 2014-11-28 | 2016-03-16 | 中冶赛迪工程技术股份有限公司 | A kind of carburization process of vanadium titano-magnetite shaft kiln directly reduced iron |
| CN106702066A (en) * | 2017-03-03 | 2017-05-24 | 江苏省冶金设计院有限公司 | System and method for enabling hydrogen to enter gas-based reduction shaft furnace to prepare direct reduced iron |
| CN106834581A (en) * | 2017-03-07 | 2017-06-13 | 江苏省冶金设计院有限公司 | A kind of top gas of reduction shaft furnace production sponge iron utilizes system and method |
| CN107008918B (en) * | 2017-06-03 | 2023-04-28 | 赣州鼎盛炉业有限公司 | Simultaneously adopting forward and reverse hydrogen supply multi-tube furnace |
| SE543341C2 (en) * | 2019-04-01 | 2020-12-08 | Greeniron H2 Ab | Method and device for producing direct reduced metal |
| CN109971906A (en) * | 2019-04-11 | 2019-07-05 | 中冶赛迪技术研究中心有限公司 | A kind of restoring method of ultralow carbon emission production sponge iron |
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