CN207749136U - The system for preparing direct reduced iron - Google Patents
The system for preparing direct reduced iron Download PDFInfo
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- CN207749136U CN207749136U CN201721278777.XU CN201721278777U CN207749136U CN 207749136 U CN207749136 U CN 207749136U CN 201721278777 U CN201721278777 U CN 201721278777U CN 207749136 U CN207749136 U CN 207749136U
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Abstract
The utility model discloses a kind of system preparing direct reduced iron, which includes：Gas-based shaft kiln, gas-based shaft kiln have acid pellet entrance, first also Primordial Qi entrance, the outlet of the first direct reduced iron and the outlet of the first top gas；Dedusting drying unit, dedusting drying unit have top gas outlet and dust outlet after the first top gas entrance, drying；Heating furnace, heating furnace are exported with top gas after top gas entrance after drying and heating, and top gas entrance is connected with the first top gas outlet after drying after drying；There is heat-accumulation type hot radiant panel, carbonaceous pelletizing mine entrance, second also Primordial Qi entrance, the outlet of the second direct reduced iron and the outlet of the second top gas, the second also Primordial Qi entrance to be connected with top gas outlet after heating for coal base shaft furnace, coal base shaft furnace.The system significantly improves the heat utilization efficiency of system by the way of gas-based shaft kiln and coal base shaft furnace coproduction, and process is simple, improves the degree of metalization of direct reduced iron.
Description
Technical field
The utility model belongs to field of metallurgy, specifically, the utility model is related to prepare the system of direct reduced iron.
Background technology
The technique of production direct reduced iron is known as direct-reduction process, belongs to non-blast furnace ironmaking technique, is divided into gas base method and coal
Base method two major classes, and MIDREX methods and HYL methods are single shaft furnace systems.At present in world wide, about 80% direct reduced iron
It is to be produced by gas base method, based on MIDREX methods and HYL methods.Heat source in gas-based shaft kiln is mainly derived from the aobvious of fresh coal gas
Heat, to meet the needs of heat supply, gas-based shaft kiln has to be passed through a large amount of fresh coal gas, and heat loss is relatively large, wherein about
40% energy is taken away by top gas.MIDREX methods are using natural gas as raw material, with the CO in top gas2Weight is carried out as transforming agent
Whole system also Primordial Qi.Top gas tapping temperature is about 450 degrees Celsius, and production 1t direct reduced iron about generates 1800m3Top gas,
Main component is：Hydrogen accounts for 34~40%, carbon monoxide and accounts for 20~40%.The treatment process such as top gas is washed, compression, desulfurization
Afterwards, it is partly used as circulating gas, remainder is as fuel or as cooling air.Cooling air is washed, after compression, returns to shaft furnace
Cooling section recycle.Aforesaid way has that shaft furnace top gas sensible heat is not utilized effectively, and top gas
It is tedious to recycle process.And coal base shaft furnace requires reaction temperature higher, reaction rate is slow.
Therefore, the technology of existing production direct reduced iron is further improved.
Utility model content
The utility model is intended to solve at least some of the technical problems in related technologies.For this purpose, this reality
It is to propose a kind of system preparing direct reduced iron with a novel purpose.The system is using gas-based shaft kiln and coal base shaft furnace
The mode of coproduction significantly improves the heat utilization efficiency of system, and process is simple, improves the degree of metalization of direct reduced iron.
In a utility model of the utility model, the utility model proposes the system for preparing direct reduced iron, according to
The embodiments of the present invention, the system include：
There is acid pellet entrance, first also Primordial Qi entrance, the first direct reduced iron to go out for gas-based shaft kiln, the gas-based shaft kiln
Mouth and the outlet of the first top gas；
Dedusting-drying unit, the dedusting drying unit have top gas outlet and powder after the first top gas entrance, drying
Dirt exports, and the first top gas entrance is connected with first top gas outlet；
Heating furnace, top gas entrance is exported with top gas after heating after the heating furnace has drying, stove after the drying
Top gas entrance is connected with top gas outlet after the drying；
There is heat-accumulation type hot radiant panel, carbonaceous pelletizing mine entrance, the second also Primordial Qi to enter for coal base shaft furnace, the coal base shaft furnace
Mouth, the outlet of the second direct reduced iron and the outlet of the second top gas, the described second also Primordial Qi entrance go out with top gas after the heating
Mouth is connected.
According to the system of the preparation direct reduced iron of the utility model embodiment, as by the high pressure obtained by gas-based shaft kiln
One top gas is directly sent after dedusting, drying and heating into the lower coal base shaft furnace of furnace pressure to be made as the second also Primordial Qi
With without the processes such as washing, cooling, making full use of the sensible heat of the first top gas, compressed without to the first top gas
With the processes such as decarburization, production cost is significantly reduced, while under the action of the first top gas, the carbonaceous pelletizing in coal base shaft furnace
The reaction time of mine substantially reduces, reaction temperature also declines to a great extent, and has significantly saved the energy consumption of coal base shaft furnace, and the of gained
The degree of metalization of two direct reduced iron significantly improves.
In addition, can also be had according to the system of the preparation direct reduced iron of the utility model above-described embodiment following additional
Technical characteristic：
Optional, the system of above-mentioned preparation direct reduced iron further comprises：Dust-extraction unit, the dust-extraction unit have mixed
Top gas exports after closing gas entrance and dedusting, and the gaseous mixture entrance is connected with second top gas outlet, after the dedusting
Top gas outlet is connected with the heating furnace.Thus, it can be achieved that efficient utilization to the second top gas.
Optional, the system of above-mentioned preparation direct reduced iron further comprises：Burner, the burner have fuel gas
Entrance, fuel inlet and combustion gas outlet, the fuel inlet are connected with top gas outlet after the dedusting, and the combustion gas goes out
Mouth is connected with the heat-accumulation type hot radiant panel.Thus, it is possible to reduce the energy consumption cost of coal base shaft furnace.
Optional, the system of above-mentioned preparation direct reduced iron further comprises：Reformer, the reformer, which has, to be turned
Agent entrance and also Primordial Qi outlet, the transforming agent entrance are connected with top gas outlet after the dedusting, the also Primordial Qi outlet
It is connected with the described first also Primordial Qi entrance.Thus, it is possible to significantly reduce the energy consumption cost of gas-based shaft kiln.
The additional aspect and advantage of the utility model will be set forth in part in the description, partly will be from following description
In become apparent, or recognized by the practice of the utility model.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the utility model will in the description from combination following accompanying drawings to embodiment
Become apparent and is readily appreciated that, wherein：
Fig. 1 is the system structure diagram according to the preparation direct reduced iron of the utility model one embodiment；
Fig. 2 is the system structure diagram according to the preparation direct reduced iron of the utility model further embodiment；
Fig. 3 is the system structure diagram according to the preparation direct reduced iron of the utility model another embodiment；
Fig. 4 is the system structure diagram according to the preparation direct reduced iron of the utility model another embodiment；
Fig. 5 is to prepare direct reduced iron using the system for preparing direct reduced iron according to the utility model one embodiment
Method flow schematic diagram；
Fig. 6 is to prepare direct-reduction using the system for preparing direct reduced iron according to the utility model further embodiment
The method flow schematic diagram of iron；
Fig. 7 is being reduced directly using the system preparation for preparing direct reduced iron according to another embodiment of the utility model
The method flow schematic diagram of iron；
Fig. 8 is being reduced directly using the system preparation for preparing direct reduced iron according to another embodiment of the utility model
The method flow schematic diagram of iron.
Specific implementation mode
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model
Limitation.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.The meaning of " plurality " is at least two, such as two in the description of the present invention,
It is a, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be
Mechanical connection can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary two
The interaction relationship of connection or two elements inside element, unless otherwise restricted clearly.For the common skill of this field
For art personnel, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In a utility model of the utility model, the utility model proposes the system for preparing direct reduced iron, according to
The embodiments of the present invention, with reference to figure 1, which includes：Gas-based shaft kiln 100, dedusting-drying unit 200, heating furnace 300
With coal base shaft furnace 400.
Embodiment according to the present utility model, gas-based shaft kiln 100 have the also Primordial Qi entrance of acid pellet entrance 101, first
102, the outlet 103 of the first direct reduced iron and the first top gas outlet 104, and being suitable for will oxidation under the action of the first also Primordial Qi
Pelletizing carries out gas-based reduction, to obtain the first direct reduced iron and the first top gas.Specifically, can be iron in acid pellet
Acid pellet made of acid pellet or v-ti magnetite concentrate made of concentrate, first also mainly work in Primordial Qi is an oxygen
Change carbon and hydrogen, at high temperature, under the action of carbon monoxide and hydrogen reduction reaction occurs for acid pellet, will be in acid pellet
Most of metal oxide be reduced to metal, obtain the first direct reduced iron.
One embodiment according to the present utility model, the first total volume accounting of carbon monoxide and hydrogen also in Primordial Qi can be with
It is 88~92%, pressure can be 0.4~0.7MPa.Inventor has found, if the first carbon monoxide also in Primordial Qi and hydrogen is total
The accounting of content is too low, then reduction degree of the acid pellet in gas-based shaft kiln reduces, and is unfavorable for improving in the first direct reduced iron
Degree of metalization.Specifically, first the volume ratio of carbon monoxide and hydrogen can be (0.20~1.00) also in Primordial Qi：1.
The temperature of further embodiment according to the present utility model, the first also Primordial Qi can be 950-1000 degrees Celsius, stream
Amount can be 1800-1900Nm3/ t reduced irons.Inventor has found, if the first reduction temperature spends height, first in gas-based shaft kiln
Wall material matter requires higher, increases equipment investment cost, and secondly gas-based shaft kiln internal oxidition pelletizing can be bonded, and be unfavorable for discharging；
And if the first reduction temperature is spent low, temperature in gas-based shaft kiln will be caused too low, the product of the first direct reduced iron caused
Matter is poor, and degree of metalization is low；If the first reduction throughput is excessive, production cost will increase；And if the first reduction throughput is too small, institute
The the first direct reduced iron poor quality obtained, degree of metalization are low.
Embodiment according to the present utility model, dedusting-drying unit 200 have stove after the first top gas entrance 201, drying
Top gas outlet 202 and dust outlet 203, the first top gas entrance 201 are connected with the first top gas outlet 104, and are suitable for the
One top gas is dusted and is dried successively, so as to top gas and dust after being dried.Specifically, first by the first furnace roof
Gas is dusted, and obtains the first top gas and dust after dedusting, water removal is dried in the first top gas after by dedusting, is done
Top gas after dry.It is remarkably improved the grade of top gas after drying as a result, to avoid to subsequent heat stove and coal base shaft furnace band
Decontamination, extends the service life of heating furnace and coal base shaft furnace, while improving the reduction efficiency in coal base shaft furnace.It needs to illustrate
It is that those skilled in the art can according to actual needs select dedusting and drying process condition.
Embodiment according to the present utility model, heating furnace 300 have top gas entrance 301 and top gas after heating after drying
Outlet 302, top gas entrance 301 is connected with top gas outlet 202 after drying after drying, and is carried out suitable for top gas after drying
Heating, so as to top gas after being heated.Inventor has found, is heated, is remarkably improved dry by top gas after drying
The temperature of top gas after dry, top gas can be used for directly as the second also Primordial Qi in follow-up coal base shaft furnace after obtained heating, by
This, is conducive to the reducing component in the sensible heat for making full use of the first top gas and the first top gas, to improve the second top gas
The degree of metalization of middle direct reduced iron.Specifically, mode of heating may be used electricity and directly heat or indirect heat exchange in heating furnace.
One embodiment according to the present utility model, the total volume accounting of carbon monoxide and hydrogen can in top gas after heating
Think 65~72%, pressure can be 0.2~0.4MPa.Inventor has found, if carbon monoxide and hydrogen in top gas after heating
Total content accounting it is too low, then reduction degree of the carbonaceous pelletizing mine in coal base shaft furnace reduces, and is unfavorable for improving second directly also
Degree of metalization in former iron.Specifically, after heating in top gas the volume ratio of carbon monoxide and hydrogen can be (0.22~
1.25)：1.
Further embodiment according to the present utility model, the temperature of top gas can be 800~1050 degrees Celsius after heating.
Inventor has found, if top gas temperature is excessively high after heating, requires higher to coal base shaft furnace inner wall material first, increases equipment investment
Cost, secondly carbonaceous pelletizing mine can be bonded in gas-based shaft kiln, be unfavorable for discharging；And if heat after top gas temperature it is too low,
Coal base will be caused to erect, and in-furnace temperature is too low, and the poor quality of the second direct reduced iron caused, degree of metalization is low.
Embodiment according to the present utility model, coal base shaft furnace 400 have heat-accumulation type hot radiant panel (not shown), carbonaceous pelletizing
Mine entrance 401, second also Primordial Qi entrance 402, the outlet 403 of the second direct reduced iron and the second top gas outlet 404, the second reduction
Gas entrance 402 is connected with top gas outlet 302 after heating, and suitable for the effect of top gas and heat-accumulation type hot radiant panel after the heating
It is lower that carbonaceous pelletizing mine is subjected to coal base reduction, to obtain the second direct reduced iron and the second top gas.Inventor has found, passes through
Using the reducing component in top gas after heating, it can be achieved that reduction to carbonaceous pelletizing mine, and after heating being made full use of
The sensible heat of top gas significantly improves the reduction efficiency of carbonaceous pelletizing mine, and then improves the degree of metalization of the second direct reduced iron, and
And the energy consumption of heat-accumulation type hot radiant panel can be significantly reduced by the utilization to the sensible heat of top gas after heating, it is cost-effective.Specifically
, carbonaceous pelletizing mine may include iron ore concentrate carbonaceous pelletizing, vanadium titano-magnetite carbonaceous pelletizing and lateritic nickel ore carbonaceous pelletizing etc..
The flow of one embodiment according to the present utility model, the second also Primordial Qi can be 1300-1400Nm3/ t is restored
Iron.Inventor has found；If the second reduction throughput is excessive, production cost will increase；And if the second reduction throughput is too small, gained
The second direct reduced iron poor quality, degree of metalization is low.
According to the system of the preparation direct reduced iron of the utility model embodiment, as by the high pressure obtained by gas-based shaft kiln
One top gas is directly sent after dedusting, drying and heating into the lower coal base shaft furnace of furnace pressure to be made as the second also Primordial Qi
With without the processes such as washing, cooling, making full use of the sensible heat of the first top gas, compressed without to the first top gas
With the processes such as decarburization, production cost is significantly reduced, while under the action of the first top gas, the carbonaceous pelletizing in coal base shaft furnace
The reaction time of mine substantially reduces, reaction temperature also declines to a great extent, and has significantly saved the energy consumption of coal base shaft furnace, and the of gained
The degree of metalization of two direct reduced iron significantly improves.
Embodiment according to the present utility model, with reference to figure 2, the system of above-mentioned preparation direct reduced iron further comprises：It removes
Dirt device 500.
Embodiment according to the present utility model, top gas exports after dust-extraction unit 500 has gaseous mixture entrance 501 and dedusting
502, gaseous mixture entrance 501 is connected with the second top gas outlet 404, and top gas exports 502 and is connected with heating furnace 300 after dedusting,
And suitable for the second top gas is dusted processing, to obtain top gas after dedusting, and by first of top gas after dedusting
Divide in supply to heating furnace and is used as fuel.Inventor has found, by the way that the second top gas to be dusted, obtains stove after dedusting
Top gas, and given to heating furnace, it can be achieved that sharp again to the resource of top gas after dedusting using top gas after a part of dedusting as fuel
With, while the impurity taken to heating furnace can be reduced, and save the energy consumption of heating furnace.Specifically, supplying to removing in heating furnace
Percent by volume after dirt shared by top gas can be 40%-65%.
Embodiment according to the present utility model, with reference to figure 3, the system of above-mentioned preparation direct reduced iron further comprises：Combustion
Burner 600.
Embodiment according to the present utility model, burner 600 have fuel gas entrance 601, fuel inlet 602 and combustion gas
Outlet 603, fuel inlet 602 are connected with top gas outlet 502 after dedusting, and combustion gas outlet 603 and heat-accumulation type hot radiant panel are (not
Show) it is connected, and suitable for the second part of top gas after dedusting and fuel gas to be mixed and burned, to obtain combustion gas, and will
Combustion gas, which is supplied, to be used into the heat-accumulation type hot radiant panel in coal base shaft furnace as heat source.Inventor has found, by will be after dedusting
The second part and fuel gas of top gas are supplied to burn into burner, can further realize in top gas after dedusting
The direct utilization of combustible component and sensible heat, and it is used as heat-accumulation type hot spoke by the way that obtained combustion gas to be back in coal base shaft furnace
The heat source for penetrating plate uses, and can further improve the heat utilization efficiency of technique.Specifically, the accounting of fuel can be top gas after dedusting
The 30%-50% of volume, and fuel gas can be semi-coke gas, coal gas of converter and low order coal pyrolysis gas etc., gained combustion gas
Temperature can be 800~1100 degrees Celsius.
Embodiment according to the present utility model, with reference to figure 4, the system of above-mentioned preparation direct reduced iron further comprises：Weight
Engagement positions 700.
Embodiment according to the present utility model, reformer 700 have transforming agent entrance 701 and also Primordial Qi outlet 702, turn
Agent entrance 701 is connected with top gas outlet 502 after dedusting, and also Primordial Qi outlet 702 is connected with the first also Primordial Qi entrance 102, and
Suitable for using the Part III of top gas after dedusting as transforming agent, to obtain also Primordial Qi, and also Primordial Qi is supplied to gas
It is used as the first also Primordial Qi in base shaft furnace.Specifically, the volume accounting as top gas after the dedusting of transforming agent can be
5%-10%, transforming agent participate in methane reforming reaction in reformer：CH4+CO2=2CO+2H2, significantly improve also Primordial Qi
The content of middle carbon monoxide and hydrogen makes it meet the requirement of the also Primordial Qi of gas-based shaft kiln first.As a result, after reformation gained also
Primordial Qi can be supplied into gas-based shaft kiln to be used as the first also Primordial Qi, and the resource to top gas after dedusting is so furthermore achieved
It recycles, significantly improves the economy of entire technique.
The system of embodiment according to the present utility model, above-mentioned preparation direct reduced iron at least has the advantages that follows
One of：
According to the system of the preparation direct reduced iron of the utility model embodiment, the top gas of gas-based shaft kiln and coal base shaft furnace
The processing such as not washed, cooling, take full advantage of the waste heat of top gas, while having saved water resource, improve the profit of the energy
With rate；
According to the system of the preparation direct reduced iron of the utility model embodiment, as by the top gas obtained by gas-based shaft kiln
It is passed through coal base shaft furnace, significantly reduces the reaction time of carbonaceous pelletizing mine and reaction temperature in coal base shaft furnace, improves production effect
Rate, and improve the degree of metalization of gained direct reduced iron；
According to the system of the preparation direct reduced iron of the utility model embodiment, because the furnace roof atmospheric pressure of gas-based shaft kiln is high,
And the pressure in coal base shaft furnace is low, therefore the top gas of gas-based shaft kiln can be passed directly into coal base shaft furnace without overcompression, decarburization etc.
It is interior, simplify top gas system.
In order to facilitate understanding, below to using above-mentioned preparation direct reduced iron system prepare direct reduced iron method into
Row detailed description, embodiment according to the present utility model, with reference to figure 5, this method includes：
S100：Acid pellet is supplied into gas-based shaft kiln, gas-based reduction is carried out under the action of the first also Primordial Qi.
In the step, acid pellet is supplied into gas-based shaft kiln, gas-based reduction is carried out under the action of the first also Primordial Qi,
To obtain the first direct reduced iron and the first top gas.Specifically, can be to aoxidize ball made of iron ore concentrate in acid pellet
Acid pellet made of group or v-ti magnetite concentrate, first also mainly work in Primordial Qi is carbon monoxide and hydrogen, in height
Under temperature, under the action of carbon monoxide and hydrogen reduction reaction occurs for acid pellet, by most of metal oxygen in acid pellet
Compound is reduced to metal, obtains the first direct reduced iron.
One embodiment according to the present utility model, the first total volume accounting of carbon monoxide and hydrogen also in Primordial Qi can be with
It is 88~92%, pressure can be 0.4~0.7MPa.Inventor has found, if the first carbon monoxide also in Primordial Qi and hydrogen is total
The accounting of content is too low, then reduction degree of the acid pellet in gas-based shaft kiln reduces, and is unfavorable for improving in the first direct reduced iron
Degree of metalization.Specifically, first the volume ratio of carbon monoxide and hydrogen can be (0.20~1.00) also in Primordial Qi：1.
The temperature of further embodiment according to the present utility model, the first also Primordial Qi can be 950-1000 degrees Celsius, stream
Amount can be 1800-1900Nm3/ t reduced irons.Inventor has found, if the first reduction temperature spends height, first in gas-based shaft kiln
Wall material matter requires higher, increases equipment investment cost, and secondly gas-based shaft kiln internal oxidition pelletizing can be bonded, and be unfavorable for discharging；
And if the first reduction temperature is spent low, temperature in gas-based shaft kiln will be caused too low, the product of the first direct reduced iron caused
Matter is poor, and degree of metalization is low；If the first reduction throughput is excessive, production cost will increase；And if the first reduction throughput is too small, institute
The the first direct reduced iron poor quality obtained, degree of metalization are low.
S200：First top gas is supplied to dedusting-drying unit and is dusted and is dried successively.
In the step, the first top gas is supplied to dedusting-drying unit and is dusted and is dried successively, so as to
Top gas and dust after to drying.Specifically, being first dusted the first top gas, the first top gas and powder after dedusting are obtained
Dirt, water removal is dried in the first top gas after by dedusting, top gas after being dried.It is remarkably improved stove after drying as a result,
The grade of top gas, to avoid, to subsequent heat stove and coal base shaft furnace band decontamination, extending the use of heating furnace and coal base shaft furnace
Service life, while improving the reduction efficiency in coal base shaft furnace.Specifically, those skilled in the art to dedusting and can do according to reality
Dry process condition is selected.
S300：Top gas after drying is supplied to heating furnace and is heated.
In the step, top gas after drying is supplied to heating furnace and is heated, so as to top gas after being heated.Invention
People has found, is heated by top gas after drying, and is remarkably improved the temperature of top gas after drying, stove after obtained heating
Top gas can make full use of the aobvious of the first top gas directly as the second also Primordial Qi in follow-up coal base shaft furnace, being conducive to as a result,
Reducing component in heat and the first top gas, to improve the degree of metalization of direct reduced iron in the second top gas.Specifically, plus
Mode of heating may be used electricity and directly heat or indirect heat exchange in hot stove.
One embodiment according to the present utility model, the total volume accounting of carbon monoxide and hydrogen can in top gas after heating
Think 65~72%, pressure can be 0.2~0.4MPa.Inventor has found, if carbon monoxide and hydrogen in top gas after heating
Total content accounting it is too low, then reduction degree of the carbonaceous pelletizing mine in coal base shaft furnace reduces, and is unfavorable for improving second directly also
Degree of metalization in former iron.Specifically, after heating in top gas the volume ratio of carbon monoxide and hydrogen can be (0.22~
1.25)：1.
Further embodiment according to the present utility model, the temperature of top gas can be 800~1050 degrees Celsius after heating.
Inventor has found, if top gas temperature is excessively high after heating, requires higher to coal base shaft furnace inner wall material first, increases equipment investment
Cost, secondly carbonaceous pelletizing mine can be bonded in gas-based shaft kiln, be unfavorable for discharging；And if heat after top gas temperature it is too low,
Coal base will be caused to erect, and in-furnace temperature is too low, and the poor quality of the second direct reduced iron caused, degree of metalization is low.
S400：Carbonaceous pelletizing mine is supplied to coal base shaft furnace, the after the heating effect of top gas and heat-accumulation type hot radiant panel
Lower carry out coal base reduction.
In the step, carbonaceous pelletizing mine is supplied to coal base shaft furnace, after the heating top gas and heat-accumulation type hot radiant panel
Effect is lower to carry out coal base reduction, to obtain the second direct reduced iron and the second top gas.Inventor has found, by using heating
The reducing component in top gas is, it can be achieved that reduction to carbonaceous pelletizing mine afterwards, and can make full use of top gas after heating
Sensible heat significantly improves the reduction efficiency of carbonaceous pelletizing mine, and then improves the degree of metalization of the second direct reduced iron, and by right
The utilization of the sensible heat of top gas can significantly reduce the energy consumption of heat-accumulation type hot radiant panel after heating, cost-effective.Specifically, containing carbon ball
Nodulizing may include iron ore concentrate carbonaceous pelletizing, vanadium titano-magnetite carbonaceous pelletizing and lateritic nickel ore carbonaceous pelletizing etc..
The flow of one embodiment according to the present utility model, the second also Primordial Qi can be that 1300-1400Nm3/t is directly gone back
Former iron.Inventor has found；If the second reduction throughput is excessive, production cost will increase；And if the second reduction throughput is too small, institute
The the second direct reduced iron poor quality obtained, degree of metalization are low.
According to the method for preparing direct reduced iron using the system for preparing direct reduced iron of the utility model embodiment, lead to
It crosses and directly send the first top gas of high pressure obtained by gas-based shaft kiln to the lower coal base of furnace pressure after dedusting, drying and heating
In shaft furnace as second also Primordial Qi uses, without washing, cool down etc. processes, make full use of the sensible heat of the first top gas, also without
The processes such as compression and decarburization need to be carried out to the first top gas, significantly reduce production cost, while in the effect of the first top gas
Under, the reaction time of the carbonaceous pelletizing mine in coal base shaft furnace substantially reduces, reaction temperature also declines to a great extent, and has significantly saved coal base
The energy consumption of shaft furnace, and the degree of metalization of the second direct reduced iron of gained significantly improves.
Embodiment according to the present utility model, it is above-mentioned to be prepared directly also using the system for preparing direct reduced iron with reference to figure 6
The method of former iron further comprises：
S500：Second top gas is supplied and is dusted processing into dust-extraction unit.
In the step, the second top gas is supplied and is dusted processing into dust-extraction unit, to obtain furnace roof after dedusting
Gas, and the first part of top gas after dedusting is supplied into heating furnace and is used as fuel.Inventor has found, by by second
Top gas is dusted, and obtains top gas after dedusting, and top gas after a part of dedusting is sent as fuel to heating furnace, can be real
Now to the resource reutilization of top gas after dedusting, while the impurity taken to heating furnace can be reduced, and save the energy consumption of heating furnace.
Specifically, supply to the percent by volume shared by top gas after the dedusting in heating furnace can be 40%-65%.
Embodiment according to the present utility model, it is above-mentioned to be prepared directly also using the system for preparing direct reduced iron with reference to figure 7
The method of former iron further comprises：
S600：The second part of top gas after dedusting is supplied into burner and is mixed and burned with fuel gas.
In the step, the second part of top gas after dedusting is supplied into burner and is mixed and burned with fuel gas, so as to
Combustion gas is obtained, and combustion gas is supplied in the heat-accumulation type hot radiant panel into S400 and is used as heat source.Inventor has found, leads to
It crosses to supply the second part of top gas after dedusting and fuel gas and burn into burner, can further realize to after dedusting
The direct utilization of combustible component and sensible heat in top gas, and be used as by the way that obtained combustion gas to be back in coal base shaft furnace
The heat source of heat-accumulation type hot radiant panel uses, and can further improve the heat utilization efficiency of technique.Specifically, the accounting of fuel can be except
The 30%-50% of top gas volume after dirt, and fuel gas can be semi-coke gas, coal gas of converter and low order coal pyrolysis gas etc., institute
The temperature for obtaining combustion gas can be 800~1100 degrees Celsius.
Embodiment according to the present utility model, it is above-mentioned to be prepared directly also using the system for preparing direct reduced iron with reference to figure 8
The method of former iron further comprises：
S700：The Part III of top gas after dedusting is supplied into reformer and is used as transforming agent.
In the step, the Part III of top gas after dedusting is supplied into reformer and is used as transforming agent, so as to
Also Primordial Qi is obtained, and also Primordial Qi is supplied into S100 and is used as the first also Primordial Qi.Specifically, after as the dedusting of transforming agent
The volume accounting of top gas can be 5%-10%, and transforming agent participates in methane reforming reaction in reformer： CH4+CO2=
2CO+2H2, the content of carbon monoxide and hydrogen in also Primordial Qi is significantly improved, it is made to meet wanting for the also Primordial Qi of gas-based shaft kiln first
It asks.As a result, after reformation gained also Primordial Qi can be supplied into gas-based shaft kiln as first also Primordial Qi uses, so further in fact
Show the resource reutilization to top gas after dedusting, significantly improves the economy of entire technique.
Below with reference to specific embodiment, the utility model is described, it should be noted that these embodiments are only
Descriptive, without limiting the utility model in any way.
Embodiment 1
Acid pellet made of iron ore concentrate Iron grade for 65.02% is put into gas-based shaft kiln, and is passed through carbon monoxide
With 1000 degrees Celsius of total volume accounting 91%, pressure 0.7MPa, the temperature and flow 1800Nm of hydrogen3The of/t direct reduced iron
One goes back Primordial Qi, wherein the volume ratio of carbon monoxide and hydrogen is 1.00：1, it is 92% to generate the first top gas and degree of metalization
First direct reduced iron；Then the first top gas is obtained one after deduster dedusting, drier drying and heating stove heat
Top gas after the heating of 950 degrees Celsius of the total volume accounting 66% of carbonoxide and hydrogen, pressure 0.4MPa and temperature, and will heating
Top gas is according to flow 1300Nm afterwards3/ t direct reduced iron is passed through as the second also Primordial Qi in coal base shaft furnace；It will be by Iron grade
68.32% hematite concentrates are supplied with the carbonaceous pelletizing mine that semi-coke is prepared into through two pairs of rollers ball press into coal base shaft furnace, wherein containing
C/O in carbon ball nodulizing is 0.8, and under the action of heat-accumulation type hot radiant tube and the second also Primordial Qi, in-furnace temperature is 1050 Celsius
Degree, carbonaceous pelletizing mine occur reduction reaction with the second also Primordial Qi in coal base shaft furnace, generate the second top gas and degree of metalization is
91% the second direct reduced iron；Second top gas obtains top gas after dedusting, and will wherein volume divide after deduster dedusting
Several 60% is supplied as fuel into heating furnace, and top gas and fuel gas are according to volume ratio 1 after the dedusting of volume fraction 30%：
Through burner combustion after 1 mixing, obtained temperature supplies for 1050 degrees Celsius of combustion gas to the heat-accumulation type hot in coal base shaft furnace
It is coal base shaft furnace heat supply in radiant tube, remaining 10% as transforming agent for reform the total of obtained carbon monoxide and hydrogen
The also Primordial Qi of volume accounting 91%, and also Primordial Qi is supplied as the first also Primordial Qi into gas-based shaft kiln using this.Gas-based shaft kiln and coal
The cooling section of base shaft furnace is all made of circulating water, the tapping temperature of the first direct reduced iron and the second direct reduced iron of gained
It is 95 degrees Celsius.
Embodiment 2
Acid pellet made of v-ti magnetite concentrate Iron grade for 54.63% is put into gas-based shaft kiln, and is passed through one
The total volume accounting 89% of carbonoxide and hydrogen, pressure 0.4MPa, 950 degrees Celsius of temperature and flow 1900Nm3/ t is reduced directly
The also Primordial Qi of the first of iron, wherein the volume ratio of carbon monoxide and hydrogen is 0.20：1, it generates the first top gas and degree of metalization is
90% the first direct reduced iron；Then by the first top gas after deduster dedusting, drier drying and heating stove heat,
Top gas after the heating of 800 degrees Celsius of the total volume accounting 69% of carbon monoxide and hydrogen, pressure 0.25MPa and temperature is obtained,
And by top gas after heating according to flow 1400Nm3/ t direct reduced iron is passed through as the second also Primordial Qi in coal base shaft furnace；It will be by
The iron ore concentrate of Iron grade 65.02% is supplied with the carbonaceous pelletizing mine that nut coke is prepared into through two pairs of rollers ball press into coal base shaft furnace,
C/O in middle carbonaceous pelletizing mine is 0.9, under the action of heat-accumulation type hot radiant tube and the second also Primordial Qi, in-furnace temperature 1030
Degree Celsius, in coal base shaft furnace with the second also Primordial Qi reduction reaction occurs for carbonaceous pelletizing mine, generates the second top gas and metallization
The second direct reduced iron that rate is 89%；Second top gas obtains top gas after dedusting after deduster dedusting, and will wherein body
The 40% of fraction is supplied as fuel into heating furnace, and top gas and fuel gas are according to volume after the dedusting of volume fraction 50%
Than 3：Through burner combustion after 1 mixing, obtained temperature supplies for 800 degrees Celsius of combustion gas to the heat accumulating type in coal base shaft furnace
It is coal base shaft furnace heat supply in heat radiation tube, remaining 10% as transforming agent for reform obtained carbon monoxide and hydrogen
The also Primordial Qi of total volume accounting 89%, and also Primordial Qi is supplied as the first also Primordial Qi into gas-based shaft kiln using this.Gas-based shaft kiln with
The cooling section of coal base shaft furnace is all made of circulating water, and the first direct reduced iron of gained and the second direct reduced iron go out furnace temperature
Degree is 95 degrees Celsius.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
It states and is necessarily directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be with
It can be combined in any suitable manner in any one or more of the embodiments or examples.In addition, without conflicting with each other, this field
Technical staff can by the feature of different embodiments or examples described in this specification and different embodiments or examples into
Row combines and combination.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are in the scope of the utility model
Inside it can make changes, modifications, alterations, and variations to the above described embodiments.
Claims (4)
1. a kind of system preparing direct reduced iron, which is characterized in that including：
Gas-based shaft kiln, the gas-based shaft kiln have acid pellet entrance, first also Primordial Qi entrance, the first direct reduced iron outlet and
First top gas exports；
Dedusting-drying unit, the dedusting drying unit go out with top gas outlet after the first top gas entrance, drying and dust
Mouthful, the first top gas entrance is connected with first top gas outlet；
Heating furnace, top gas entrance is exported with top gas after heating after the heating furnace has drying, top gas after the drying
Entrance is connected with top gas outlet after the drying；
Coal base shaft furnace, the coal base shaft furnace have heat-accumulation type hot radiant panel, carbonaceous pelletizing mine entrance, second also Primordial Qi entrance, the
Two direct reduced iron export and the outlet of the second top gas, and the described second also Primordial Qi entrance exports phase with top gas after the heating
Even.
2. system according to claim 1, which is characterized in that further comprise：
Dust-extraction unit, top gas exports after the dust-extraction unit has gaseous mixture entrance and dedusting, the gaseous mixture entrance and institute
It states the outlet of the second top gas to be connected, top gas exports and is connected with the heating furnace after the dedusting.
3. system according to claim 2, which is characterized in that further comprise：
There is fuel gas entrance, fuel inlet and combustion gas outlet, the fuel inlet to be removed with described for burner, the burner
Top gas outlet is connected after dirt, and the combustion gas outlet is connected with the heat-accumulation type hot radiant panel.
4. system according to claim 2 or 3, which is characterized in that further comprise：
Reformer, the reformer have transforming agent entrance and also Primordial Qi outlet, the transforming agent entrance and the dedusting
Top gas outlet afterwards is connected, and the also Primordial Qi outlet is connected with the described first also Primordial Qi entrance.
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| CN201721278777.XU CN207749136U (en) | 2017-09-29 | 2017-09-29 | The system for preparing direct reduced iron |
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| CN201721278777.XU CN207749136U (en) | 2017-09-29 | 2017-09-29 | The system for preparing direct reduced iron |
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