CN104293998A - Method and system of preparing spongy iron by using gas-based shaft furnace - Google Patents
Method and system of preparing spongy iron by using gas-based shaft furnace Download PDFInfo
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- CN104293998A CN104293998A CN201410345661.8A CN201410345661A CN104293998A CN 104293998 A CN104293998 A CN 104293998A CN 201410345661 A CN201410345661 A CN 201410345661A CN 104293998 A CN104293998 A CN 104293998A
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Abstract
A disclosed method of preparing spongy iron by using a gas-based shaft furnace comprises: (1) adding an oxidation pellet into the gas-based shaft furnace which possesses a reducing segment and a cooling segment; (2) performing hydrogen extraction processing on a first reducing gas to obtain hydrogen and carbon monoxide rich gas; (3) mixing a second reducing gas and hydrogen and performing heating processing, so as to obtain a thermal-state reducing gas; (4) conveying the thermal-state reducing gas into the reducing segment, and reacting with the oxidation pellet for reduction, so as to obtain spongy iron and furnace top gas; (5) conveying carbon monoxide rich gas into the cooling segment, so as to perform heat exchange between the carbon monoxide rich gas and spongy iron in the cooling segment and perform carburization reaction and then enable the gas to move upwards and enter the reducing segment; (6) performing washing cooling processing, compression processing and desulphurization decarburization processing on the furnace top gas, so as to obtain unreacted reducing gas; (7) mixing a part of the unreacted reducing gas with the first reducing gas; and (8) mixing the other part of the unreacted reducing gas with the second reducing gas. The method is capable of effectively reducing energy consumption of a technology of using the gas-based shaft furnace for direct reduction.
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 the steelmaking feed replacing steel scrap and be better than steel scrap, impurity element components in steel scrap can be diluted, for Electric furnace steel making provides requisite pure iron material, and then producing staple product for high-end equipment Manufacturing and provide high-quality billet cast piece, is the important raw and processed materials of development equipment manufacture.
At present, the sponge iron of more than 75% adopts gas-based shaft kiln method to produce in the world, and wherein typical technique is MIDREX technique, HYL III (Energiron) technique and PERED technique.The discharge method of sponge iron has two kinds, and hot wafering (HBI) and hot sponge iron (HDRI) are produced in instant heating discharging, and cold discharging production cold conditions sponge iron (CDRI).The product of hot discharging is only suitable for direct-reduction ironworks and the very near large-scale synthesis iron and steel enterprise of electric furnace factory distance, and most direct-reduction factory does not possess this condition, the therefore cold discharging of product needed, avoids sponge iron to reoxidize, to ensure the quality of sponge iron.This method is taked to pass into cooling gas at shaft furnace bottom cooling section, sponge iron is cooled to less than 50 DEG C and discharges.Carry out carburizing at cooling section, to alleviate the energy consumption burden of molten subdivision simultaneously.
Shaft furnace cooling section realizes cooling of sponge iron by equipment such as cooling washing tower and compressor etc.The Sweet natural gas of room temperature and the mixing of circulation cooled coal gas, enter cooling section bottom after compressor pressurization, carries out heat exchange, and carry out carburization reaction in gas uphill process with the sponge iron from top to bottom moved.Then, the cold gas absorbing sponge iron heat is got rid of by cooling section top, after cooling washing tower, mixes with the Sweet natural gas supplemented, and again enters cooling section bottom, form cold gas partial circulating after compressor pressurization.There is four problems in this method: (1) enters shaft furnace due to reducing gas bottom reduction section, and the sensible heat of sponge iron is not utilized, and therefore reducing gas heating installation scale is large, energy consumption is high.(2) reducing gas enters shaft furnace from bustle pipe bottom reduction section, and reducing gas is difficult to arrive shaft furnace center, and reduction air flow method is uneven.(3) element sulphur in iron ore easily enters vertical furnace top gas, and recycle vertical furnace top gas needs to add desulfurizer.(4) due to H in circulating cooling gas
2the value of/carbon monoxide is higher, and in gas, carbon monoxide content is lower, and carburizing sponge iron effect is not very good.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, one object of the present invention is to propose a kind of method that gas-based shaft kiln prepares sponge iron.Utilize the method and system effectively can reduce the energy consumption of gas-based shaft kiln directly reduced technique, make reducing gas air flow method and uniformity of temperature profile, alleviate the burden of vertical furnace top gas sweetener, increase the carburizing amount of sponge iron, reduce several large subject matter in the existing gas-based shaft kiln directly reduced techniques such as the energy consumption of molten division technique.
According to an aspect of the present invention, the present invention proposes a kind of method that gas-based shaft kiln prepares sponge iron, comprising:
(1) in described gas-based shaft kiln, add acid pellet, wherein, described gas-based shaft kiln has reduction section and cooling section, and described reduction section is positioned at the top of described 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 described hydrogen mixed and carry out heat treated, to obtain hot reducing gas;
(4) described hot reducing gas is delivered in described gas-based shaft kiln from described reduction section, make described hot reducing gas and described acid pellet generation reduction reaction, to obtain sponge iron and top gas;
(5) described rich CO (carbon monoxide converter) gas is delivered in described gas-based shaft kiln from described cooling section, so as to make the described sponge iron in described rich CO (carbon monoxide converter) gas and described cooling section carry out heat exchange and carburization reaction backward on enter described reduction section and carry out described reduction reaction;
(6) the described top gas obtained in step (4) is carried out wash cooling process, processed compressed and desulfurization and decarburization process successively respectively, to obtain unreacted reducing gas.
(7) before carrying out step (2), a part for described unreacted reducing gas is mixed with described first reducing gas;
(8) before carrying out step (3), another part of described unreacted reducing gas is mixed with described second reducing gas.
Therefore, the method utilizing the above embodiment of the present invention gas-based shaft kiln to prepare sponge iron effectively can reduce the energy consumption of gas-based shaft kiln directly reduced technique, make reducing gas air flow method and uniformity of temperature profile, alleviate the burden of vertical furnace top gas sweetener, increase the carburizing amount of sponge iron, reduce several large subject matter in the existing gas-based shaft kiln directly reduced techniques such as the energy consumption of molten division technique.
In some embodiments of the invention, in the described rich CO (carbon monoxide converter) gas obtained in step (2), carbon monoxide content is not less than 70 volume %.
In some embodiments of the invention, the temperature entering the described rich CO (carbon monoxide converter) gas of described reduction section in step (5) is 850 ~ 900 degrees Celsius.Directly can enter reduction section thus and carry out reduction reaction, the air temperature and current distribution consistency degree in reduction section can also be improved, improve the quality of products.
In some embodiments of the invention, the temperature of the described hot reducing gas obtained in step (3) is 900 ~ 1000 degrees Celsius.More traditionally thus need reducing gas to be heated to 1050 ~ 1200 degrees Celsius and more save energy consumption.
In some embodiments of the invention, in step (5), described rich CO (carbon monoxide converter) gas is delivered in described gas-based shaft kiln from the bottom of described cooling section.Can improve further thus and fully the contacting, fully to carry out heat exchange and carburization reaction of sponge iron.
According to a further aspect in the invention, the invention allows for the system that a kind of gas-based shaft kiln prepares sponge iron, comprising:
Gas-based shaft kiln, described gas-based shaft kiln has the outlet of opening for feed, discharge gate and top gas, the cooling chamber that described gas-based shaft kiln has reduction chamber and is positioned at below described reduction chamber, wherein, described reduction chamber has reducing gas import, described cooling chamber has cold gas import;
Carry hydrogen production device, described in carry hydrogen production device there is the outlet of inlet mouth, hydrogen outlet and rich CO (carbon monoxide converter) gas, described rich CO (carbon monoxide converter) gas outlet is connected with the cold gas import of described cooling chamber;
Process furnace, carries described in described process furnace is arranged between hydrogen production device and described gas-based shaft kiln, and is connected with the reducing gas import of described hydrogen outlet with described reduction chamber respectively;
Wash cooling device, described wash cooling device exports with described top gas and is connected;
Compression set, described compression set is connected with described wash cooling device; And
Desulfurization and decarburization device, described desulfurization and decarburization device is connected with described hydrogen production device of carrying with described compression set, described process furnace respectively.
Therefore, the system utilizing the above embodiment of the present invention gas-based shaft kiln to prepare sponge iron effectively can reduce the energy consumption of gas-based shaft kiln directly reduced technique, make reducing gas air flow method and uniformity of temperature profile, alleviate the burden of vertical furnace top gas sweetener, increase the carburizing amount of sponge iron, reduce several large subject matter in the existing gas-based shaft kiln directly reduced techniques such as the energy consumption of molten division technique.Can also make full use of top gas simultaneously, reduce the use of reducing gas, reduce energy consumption.
In some embodiments of the invention, the bottom of the contiguous described cooling chamber of described cold gas import.Can fully cool sponge iron thus.
Accompanying drawing explanation
Fig. 1 is that gas-based shaft kiln prepares the schema of the method for sponge iron according to an embodiment of the invention.
Fig. 2 is that gas-based shaft kiln prepares the structure iron of the system of sponge iron according to an embodiment of the invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
The gas-based shaft kiln describing the embodiment of the present invention below with reference to Fig. 1 prepares the method for sponge iron.The method that gas-based shaft kiln prepares sponge iron according to an embodiment of the invention comprises:
(1) in described gas-based shaft kiln, add acid pellet, wherein, gas-based shaft kiln has reduction section and cooling section, and reduction section is positioned 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 mixed and carry out heat treated, to obtain hot reducing gas;
(4) hot reducing gas is delivered in gas-based shaft kiln from reduction section, make hot reducing gas and acid pellet generation reduction reaction, to obtain sponge iron and top gas; And
(5) rich CO (carbon monoxide converter) gas is delivered in gas-based shaft kiln from cooling section, so as to make the sponge iron in rich CO (carbon monoxide converter) gas and cooling section carry out heat exchange and carburization reaction backward on enter reduction section and carry out reduction reaction.
First, the present invention is delivered to gas-based shaft kiln in as cooling gas from the bottom of cooling section using putting forward the rich CO (carbon monoxide converter) gas that hydrogen process obtains to reducing gas, and the rich CO (carbon monoxide converter) gas be simultaneously preheated enters in reduction section for reduction reaction.Because the carbon monoxide content in rich CO (carbon monoxide converter) gas is higher, according to a particular embodiment of the invention, in rich CO (carbon monoxide converter) gas, carbon monoxide content is not less than 70 volume %, and the specific heat capacity of carbon monoxide is H
21/10th, therefore cooling performance is better, and CO (carbon monoxide converter) gas is more easily preheated.On the other hand, rich CO (carbon monoxide converter) gas in cooling section further with sponge iron generation carburization reaction, the carburization reaction of carbon monoxide is thermopositive reaction, is more beneficial to the preheating of cooling gas.Therefore, cooling gas is at shaft furnace cooling section after thermal sponge iron preheating, and temperature can reach 850 ~ 900 DEG C, takes full advantage of the sensible heat of hot sponge iron, for energy consumption is saved in whole technical process.Because the temperature after cooling gas preheating is high, rich hydrogen reduction gas only need be heated to 900 ~ 1000 DEG C, just can form the temperature field of acid pellet reduction requirement in reduction shaft furnace section, further reduce the energy consumption of whole technical process.Again on the one hand, because the temperature of the rich CO (carbon monoxide converter) gas through sponge iron preheating can reach 850 ~ 900 DEG C, after therefore entering reduction section, directly reduction reaction can be carried out.And rich CO (carbon monoxide converter) gas enters reduction section from the cooling section that diameter is little, can arrive the reduction section central zone that hot reducing gas not easily arrives, can make uniformity of temperature profile in reduction section thus, air flow method is even, is more beneficial to the control of quality product.
Secondly, owing to adopting rich CO (carbon monoxide converter) gas as the cooling gas of cooling section, sponge iron generation carburization reaction in cooling section is more beneficial to, therefore the carbon content of sponge iron can be significantly improved, higher carbon containing requirement can be met, thus reduce follow-up molten divisional processing burden, reduce energy consumption.According to specific embodiment of the invention, in step (5), the contiguous bottom of rich CO (carbon monoxide converter) gas from cooling section is delivered in described gas-based shaft kiln.Can contact with sponge iron fully thus and carburization reaction occurs, reduce the problem of sponge iron simultaneously, improve the temperature of carbon monoxide self.
3rd, owing to adopting rich CO (carbon monoxide converter) gas as the cooling gas of cooling section, while raising sponge iron carbon content, consume the carbon monoxide in more cold gas, and then the carbon monoxide content of the reducing gas in whole gas-based shaft kiln can be reduced, the katalysis of metallic iron in cooling section can also be utilized, the methane gas in catalytic pyrolysis cold gas simultaneously, and then gas is reformed, further increase the H of the reducing gas in reduction section
2/ CO ratio, final raising reduction reaction efficiency.
Therefore, the method utilizing the above embodiment of the present invention gas-based shaft kiln to prepare sponge iron effectively can reduce the energy consumption of gas-based shaft kiln directly reduced technique, make reducing gas air flow method and uniformity of temperature profile, alleviate the burden of vertical furnace top gas sweetener, increase the carburizing amount of sponge iron, reduce several large subject matter in the existing gas-based shaft kiln directly reduced techniques such as the energy consumption of molten division technique.
According to a particular embodiment of the invention, the first and second reducing gass in above-mentioned steps (2) and step (3) can be reformed gas and the gas maked coal of Sweet natural gas, coke-oven gas or coal-seam gas, H wherein
290 volume % are not less than with the total content of carbon monoxide.Utilize this reducing gas can reduction reaction efficiency further thus, to improve efficiency and the productive rate of preparing cavernous body further.According to a particular embodiment of the invention, entering in reduction section what first carry out reduction reaction is the hot reducing gas of mixing containing the second reducing gas and hydrogen after heating, hydrogen wherein and carbon monoxide ratio higher, reduction reaction efficiency can be improved further thus.After first the rich CO (carbon monoxide converter) gas simultaneously obtained through proposing hydrogen process enters cooling section, part carbon monoxide can be consumed with sponge iron generation carburization reaction, the high temperature carbon monoxide occurred after carburization reaction and preheating upwards can enter in reduction section and then with the hot reducing gas that mixes containing the second reducing gas and hydrogen and again mixes and carry out reduction reaction, because carburization reaction consumes the carbon monoxide of a part, and then make finally to enter H in the total reducing gas in reduction section
2with the total content of carbon monoxide under the prerequisite being not less than 90 volume %, make H
2/ CO ratio have also been obtained raising, and then more contributes to improving reduction reaction efficiency.
According to a particular embodiment of the invention, in step (3), only the second reducing gas and hydrogen need be mixed and carry out being heated to 900 ~ 1000 degrees Celsius and obtain hot reducing gas, and the temperature of traditional reducing gas for gas-based shaft kiln reduction reaction needs to reach 1050 ~ 1200 degrees Celsius even higher, the method that therefore gas-based shaft kiln of the above embodiment of the present invention prepares sponge iron saves energy consumption more.This is because the temperature of the rich CO (carbon monoxide converter) gas through sponge iron preheating can reach 850 ~ 900 DEG C, directly reduction reaction can be carried out after not only entering reduction section, and rich CO (carbon monoxide converter) gas enters reduction section from the cooling section that diameter is little, the reduction section central zone that hot reducing gas not easily arrives can be arrived, uniformity of temperature profile in reduction section can be made thus, air flow method is even, reduction reaction is more easily carried out, therefore the temperature of the hot reducing gas of reduction section is without the need to too high, and then significantly saves energy consumption.And traditional reducing gas enters from gas-based shaft kiln reduction section the central zone being difficult to arrive reduction section, easily cause reaction not exclusively, quality product is wayward, therefore needs to be heated to more than 1000 degrees Celsius improve reduction reaction degree.
As shown in Figure 1, according to a particular embodiment of the invention, the method that above-mentioned gas-based shaft kiln prepares sponge iron comprises:
(6) top gas obtained in step (4) is carried out wash cooling process, processed compressed and desulfurization and decarburization process successively respectively, to obtain unreacted reducing gas.
Can, so that make full use of top gas further, avoid wasting unreacted reducing gas thus.In addition, by the control to top gas decarburization link, make CO2 removal rate be 85% ~ 95%, shaft furnace cooling section can be avoided to analyse carbon in a large number and the pelletizing pulverizing problem caused, and reduce the height of gaseous tension and absorption inner-tower filling material, reduce production cost.
According to a particular embodiment of the invention, the unreacted reducing gas obtained in above-mentioned top gas can be used for gas-based shaft kiln and prepare sponge iron.Particularly, unreacted reducing gas can be filled in reduction section and cooling section respectively.
As shown in Figure 1, according to a particular embodiment of the invention, the method that the gas-based shaft kiln of above-described embodiment prepares sponge iron comprises:
(7) before carrying out step (2), a part for unreacted reducing gas is mixed with the first reducing gas;
(8) before carrying out step (3), another part of unreacted reducing gas is mixed with the second reducing gas.
Thus unreacted reducing gas is filled into respectively in the first reducing gas and the second reducing gas, save energy consumption.
According to a particular embodiment of the invention, in order to compressor normally works, the temperature of top gas after wash cooling process is less than 50 degrees Celsius.Usual first and second reducing gas temperature are also less than 50 degrees Celsius.Therefore, the rich carbon monoxide gas temperature entering cooling section is also less than 50 degrees Celsius, and then can cool the high-temperature sponge iron in cooling section.
According to a particular embodiment of the invention, a carbon monoxide part for top gas obtained after treatment is as cooling gas, the sponge iron in cooling section can be utilized to remove element sulphur in gas, alleviate the burden of gas sweetening unit in technique, not only reduce the production cost of technique, and improve the production efficiency of equipment.
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, the system that the gas-based shaft kiln that the embodiment of the present invention is described below prepares sponge iron comprises: gas-based shaft kiln 100, carry hydrogen production device 200, process furnace 300, wash cooling device 400, compression set 500 and desulfurization and decarburization device 600.
According to a particular embodiment of the invention, gas-based shaft kiln 100 has opening for feed 101, discharge gate 102 and top gas outlet 103, the cooling chamber 120 that gas-based shaft kiln 100 has reduction chamber 110 and is positioned at below reduction chamber 110, wherein, reduce that chamber 110 has reducing gas import 104, cooling chamber has cold gas import 105; Carry hydrogen production device 200 and have inlet mouth 201, hydrogen outlet 202 and rich CO (carbon monoxide converter) gas outlet 203, rich CO (carbon monoxide converter) gas outlet 203 is connected with the cold gas import 105 of cooling chamber; And process furnace 300 is arranged on and carries between hydrogen production device 200 and gas-based shaft kiln 100, and respectively with hydrogen outlet 202 with reduce the reducing gas import 104 of chamber and be connected.
First, gas-based shaft kiln according to the abovementioned embodiments of the present invention prepares the system of sponge iron, first can utilize and carry hydrogen production device 200 and carry out reducing gas putting forward the rich CO (carbon monoxide converter) gas and hydrogen that hydrogen process obtains, and rich CO (carbon monoxide converter) gas is delivered in gas-based shaft kiln as cooling gas from the bottom of gas-based shaft kiln cooling section, the rich CO (carbon monoxide converter) gas be preheated in cooling section enters in reduction section and continues on for reduction reaction.Carry hydrogen process obtain hydrogen then together heated with reducing gas after for the reduction reaction in reduction section.Specific heat capacity due to carbon monoxide is H
21/10th, therefore adopt that to put forward the rich CO (carbon monoxide converter) gas that hydrogen production device process obtains better as the cooling performance of cooling gas, CO (carbon monoxide converter) gas is more easily preheated simultaneously.On the other hand, rich CO (carbon monoxide converter) gas in cooling section also can further with sponge iron generation carburization reaction, the carburization reaction of carbon monoxide is thermopositive reaction, is more beneficial to the preheating of cooling gas.Therefore, cooling gas is at shaft furnace cooling section after thermal sponge iron preheating, and temperature can reach 850 ~ 900 DEG C, takes full advantage of the sensible heat of hot sponge iron, for energy consumption is saved in whole technical process.Because the temperature after cooling gas preheating is high, rich hydrogen reduction gas only need be heated to 900 ~ 1000 DEG C, just can form the temperature field of acid pellet reduction requirement in reduction shaft furnace section, further reduce the energy consumption of whole technical process.Again on the one hand, because the temperature of the rich CO (carbon monoxide converter) gas through sponge iron preheating can reach 850 ~ 900 DEG C, after therefore entering reduction section, directly reduction reaction can be carried out.And rich CO (carbon monoxide converter) gas enters reduction section from the cooling section that diameter is little, can arrive the reduction section central zone that hot reducing gas not easily arrives, can make uniformity of temperature profile in reduction section thus, air flow method is even, is more beneficial to the control of quality product.
Secondly, adopt and carry rich CO (carbon monoxide converter) gas that hydrogen production device process the obtains cooling gas as cooling section, more be beneficial to sponge iron generation carburization reaction in cooling section, therefore the carbon content of sponge iron can be significantly improved, higher carbon containing requirement can be met, thus reduce follow-up molten divisional processing burden, reduce energy consumption.
3rd, adopt and carry the rich CO (carbon monoxide converter) gas of employing that hydrogen production device process the obtains cooling gas as cooling section, while raising sponge iron carbon content, the carbon monoxide in more cold gas can be consumed, and then the carbon monoxide content of the reducing gas in whole gas-based shaft kiln can be reduced, the katalysis of metallic iron in cooling section can also be utilized, the methane gas in catalytic pyrolysis cold gas simultaneously, and then gas is reformed, further increase the H of the reducing gas in reduction section
2/ CO ratio, final raising reduction reaction efficiency.
Therefore, the system utilizing the above embodiment of the present invention gas-based shaft kiln to prepare sponge iron effectively can reduce the energy consumption of gas-based shaft kiln directly reduced technique, make reducing gas air flow method and uniformity of temperature profile, alleviate the burden of vertical furnace top gas sweetener, increase the carburizing amount of sponge iron, reduce several large subject matter in the existing gas-based shaft kiln directly reduced techniques such as the energy consumption of molten division technique.
As shown in Figure 2, the gas-based shaft kiln according to the above embodiment of the present invention wash cooling device 400 prepared in the system of sponge iron exports 103 with top gas and is connected, compression set 500 wash cooling device 400 is connected, and compression set 500 is connected with desulfurization and decarburization device 600.The top gas of discharging in reduction section 110 can be purified and desulfurization and decarburization process by said apparatus thus, and then obtain unreacted reducing gas, so that recycle reducing gas unreacted in top gas further.
According to a particular embodiment of the invention, desulfurization and decarburization device 600 respectively with process furnace 300 with carry hydrogen production device 200 and be connected.And then unreacted reducing gas can be filled into respectively process furnace 300 and carry hydrogen production device 200, make full use of unreacted reducing gas in top gas thus and can save partial reduction gas, save energy consumption, reduce costs.Wherein, a part for unreacted reducing gas filled into and carry hydrogen production device 200, the hydrogen obtained after proposing hydrogen process and carbon monoxide are respectively used to cooling and the carburization reaction of the reduction reaction in reduction section 110 and the sponge iron in cooling section 120.Partial reduction gas can be saved by making full use of unreacted reducing gas in top gas thus, saving energy consumption, reducing costs.Sponge iron is being cooled and the sulphur in cooling gas while carburization reaction, can also sloughed in addition, and then alleviating the burden of vertical furnace top gas sweetener.
According to a particular embodiment of the invention, the bottom of the contiguous cooling chamber 120 of cold gas import 105.The bottom of rich CO (carbon monoxide converter) gas as cold gas from cooling chamber 120 can be entered thus, sponge iron can be made thus to contact with carbon monoxide fully, improve cooling performance and carburizing effect.
Embodiment
As shown in Figure 1-2, fresh reducing gas is divided into two portions, a part carries hydrogen production device through gas, this part gas is divided into hydrogen and rich CO (carbon monoxide converter) gas, another part of hydrogen wherein and fresh reducing gas is together passed into gas heating stove carry out being heated to 900 ~ 1000 degrees Celsius, then enter in reduction shaft furnace section from the bustle pipe bottom reduction shaft furnace section and carry out reduction reaction with the acid pellet entered from shaft furnace top.Rich CO (carbon monoxide converter) gas, from passing into bottom shaft furnace cooling section, is carried out heat exchange with hot sponge iron, and in shaft furnace cooling section, sponge iron is cooled to less than 50 DEG C, carry out carburization reaction simultaneously and consume a part of carbon monoxide.This part rich CO (carbon monoxide converter) gas is heated to 850 ~ 900 degrees Celsius in the cooling section of shaft furnace, and continue upwards to flow into reduction section, and the rich hydrogen thermal reduction gas entered with bustle pipe in reduction section mixes, common reduction-oxidation pelletizing, the rich CO (carbon monoxide converter) gas entering reduction section from cooling section can arrive the central zone of reduction section, and then the air temperature and current in reduction section can be made to be evenly distributed, reduction reaction is easily carried out.
The top gas produced in reduction section is discharged from the outlet of vertical furnace top gas.Unreacted reducing gas is obtained after the top gas of discharge being carried out wash cooling process, processed compressed and desulfurization and decarburization process, unreacted reducing gas is passed into respectively process furnace and carrying in hydrogen production device, so that the reduction reaction be respectively used in reduction section and carry out cooling process to the sponge iron in cooling section.Save the fresh reducing gas of part.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term need not for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification sheets or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (7)
1. gas-based shaft kiln prepares a method for sponge iron, it is characterized in that, comprising:
(1) in described gas-based shaft kiln, add acid pellet, wherein, described gas-based shaft kiln has reduction section and cooling section, and described reduction section is positioned at the top of described 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 described hydrogen mixed and carry out heat treated, to obtain hot reducing gas;
(4) described hot reducing gas is delivered in described gas-based shaft kiln from described reduction section, make described hot reducing gas and described acid pellet generation reduction reaction, to obtain sponge iron and top gas;
(5) described rich CO (carbon monoxide converter) gas is delivered in described gas-based shaft kiln from described cooling section, so as to make the described sponge iron in described rich CO (carbon monoxide converter) gas and described cooling section carry out heat exchange and carburization reaction backward on enter described reduction section and carry out described reduction reaction;
(6) the described top gas obtained in step (4) is carried out wash cooling process, processed compressed and desulfurization and decarburization process successively respectively, to obtain unreacted reducing gas;
(7) before carrying out step (2), a part for described unreacted reducing gas is mixed with described first reducing gas;
(8) before carrying out step (3), another part of described unreacted reducing gas is mixed with described second reducing gas.
2. method according to claim 1, is characterized in that, in the described rich CO (carbon monoxide converter) gas obtained in step (2), carbon monoxide content is not less than 70 volume %.
3. method according to claim 1, is characterized in that, the temperature entering the described rich CO (carbon monoxide converter) gas of described reduction section in step (5) is 850 ~ 900 degrees Celsius.
4. method according to claim 1, is characterized in that, the temperature of the described hot reducing gas obtained in step (3) is 900 ~ 1000 degrees Celsius.
5. method according to claim 1, is characterized in that, the contiguous bottom end of described rich CO (carbon monoxide converter) gas from described cooling section is delivered in described gas-based shaft kiln in step (5).
6. gas-based shaft kiln prepares a system for sponge iron, it is characterized in that, comprising:
Gas-based shaft kiln, described gas-based shaft kiln has the outlet of opening for feed, discharge gate and top gas, the cooling chamber that described gas-based shaft kiln has reduction chamber and is positioned at below described reduction chamber, wherein, described reduction chamber has reducing gas import, described cooling chamber has cold gas import;
Carry hydrogen production device, described in carry hydrogen production device there is the outlet of inlet mouth, hydrogen outlet and rich CO (carbon monoxide converter) gas, described rich CO (carbon monoxide converter) gas outlet is connected with the cold gas import of described cooling chamber;
Process furnace, carries described in described process furnace is arranged between hydrogen production device and described gas-based shaft kiln, and is connected with the reducing gas import of described hydrogen outlet with described reduction chamber respectively;
Wash cooling device, described wash cooling device exports with described top gas and is connected;
Compression set, described compression set is connected with described wash cooling device; And
Desulfurization and decarburization device, described desulfurization and decarburization device is connected with described hydrogen production device of carrying with described compression set, described process furnace respectively.
7. system according to claim 6, is characterized in that, the bottom of the contiguous described cooling chamber of described cold gas import.
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| CN106191362A (en) * | 2016-09-13 | 2016-12-07 | 江苏省冶金设计院有限公司 | The nozzle-type reducing gases of a kind of gas-based shaft kiln enters furnace apparatus and method thereof |
| CN106521071A (en) * | 2016-12-15 | 2017-03-22 | 江苏省冶金设计院有限公司 | Gas-based vertical furnace and method for preparing sponge iron by means of cold consolidated pellets |
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| CN106834585A (en) * | 2017-03-31 | 2017-06-13 | 江苏省冶金设计院有限公司 | The system and method for preparing sponge iron |
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| CN115552042A (en) * | 2020-05-28 | 2022-12-30 | 日本制铁株式会社 | Method for producing reduced iron |
| 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 |
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| CN116516093B (en) * | 2023-05-22 | 2024-05-14 | 河钢集团有限公司 | Production device for direct reduced iron |
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