CN107400747A - A kind of system and method using oil gas smelting DRI is pyrolyzed - Google Patents
A kind of system and method using oil gas smelting DRI is pyrolyzed Download PDFInfo
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- CN107400747A CN107400747A CN201710770960.XA CN201710770960A CN107400747A CN 107400747 A CN107400747 A CN 107400747A CN 201710770960 A CN201710770960 A CN 201710770960A CN 107400747 A CN107400747 A CN 107400747A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
Abstract
The present invention relates to a kind of system and method using oil gas smelting DRI is pyrolyzed, the system includes pyrolysis oven, heater and the gas-based shaft kiln being sequentially connected.This method is implemented by the system.By the system and method for the present invention, the sensible heat of high temperature pyrolysis of oil and gas of the present invention obtains fully efficiently utilizing, and efficiency of energy utilization is high；The present invention does raw material production also Primordial Qi without using substantial amounts of natural gas using cheap low-order coal so that gas-based shaft kiln production line is built in natural gas scarce areas, produces high-quality DRI, product cost significantly reduces；For the present invention without using a large amount of expensive reforming catalysts, maintenance cost is low, and the sulfur content in gas-based shaft kiln also Primordial Qi is limited without strict.
Description
Technical field
Smelted the invention belongs to direct reduction processes of Iron ores field, and more particularly, to one kind using oil gas is pyrolyzed
The system and method for DRI.
Background technology
DRI (DRI) is also known as sponge iron, is iron ore less than the iron content for being reduced directly to obtain under fusion temperature
Product.Sponge iron is a kind of substitute of steel scrap, is electric furnace refining clean steel, the indispensable impurity diluent of high-quality steel, is to turn
Stove makes steel high-quality cooling agent, is to develop the indispensable raw material of Ferrous Metallurgy short route.2015, whole world DRI
Annual production up to 75,200,000 tons, record high.China by direct-reduction technique be classified as development of iron ＆ steel industry Main way it
One.
The technique of production DRI is referred to as direct-reduction process, belongs to non-blast furnace ironmaking technique, is divided into gas base method and coal
The major class of base method two.Wherein gas base method has the characteristics that energy consumption is low, pollution is small, product quality is stable.At present in world wide, 76%
DRI be by gas base method produce, mainly by gas raw material processed of natural gas with prepare high-quality also Primordial Qi, reduction
CO+H in gas2>85%.Current this kind of process industry process units be concentrated mainly on the gas reserves such as the Middle East, South America it is abundant,
Cheap area；And for natural gas is more rare, expensive area, then construction life can not be carried out using the technology
Produce to obtain good economic benefit.The energy natural endowment feature of China is " rich coal few gas oil starvation ", it is difficult to using gas renormalizing-
Gas-based shaft kiln directly reduced technique, it will be optimal selection that also Primordial Qi is produced by coal.
The low-order coals such as lignite, jet coal in coal, have the characteristics that volatile matter is high, activity is strong, because of moisture therein and
Oxygen content is high and calorific value is low, directly burns or gasification utilization ratio is low, economic value can not show a candle to high-order coal, therefore large-scale development
Low-order coal must first be processed upgrading to it and could more preferably utilize.Pyrolysis processing, it is the most scientific effective of processing low-order coal
One of method.Pyrolysis refers to that coal when completely cutting off air or continuous heating to higher temperature under inert gas conditions, is occurred
A series of physical changes and chemical reaction, finally gives the products such as gas (pyrolysis gas), liquid (tar) and solid (semicoke),
Pyrolysis gas therein can be as the high-quality reducing gas of reduction shaft furnace iron ore.
However, the existing system and method for smelting DRI are present, thermal loss is big, energy utilization rate is low, cost is high
And the sensible heat of cooled exhaust gas the defects of not being utilized.Therefore, in order to overcome prior art the shortcomings that, a kind of new smelting
The system and method for DRI are desired.
The content of the invention
In view of the above-mentioned problems, it is an object of the invention to provide it is a kind of using be pyrolyzed oil gas smelt DRI system and
Method.By the system and method, the present invention realizes following purpose：
1) 700-900 DEG C of high temperature pyrolysis of oil and gas of pyrolysis oven production are without washing cooling processing, direct heated dress
Gas-based shaft kiln is sent into as reducing gas reducing iron ore after putting concurrent heating.The sensible heat of high temperature pyrolysis of oil and gas obtains fully efficiently sharp
With efficiency of energy utilization is high.
2) without using a large amount of expensive reforming catalysts, maintenance cost is low, and the sulphur in gas-based shaft kiln also Primordial Qi is contained
Amount is without strict limitation.
3) without using substantial amounts of natural gas, and raw material production also Primordial Qi is done using cheap low-order coal so that day
Gas-based shaft kiln production line is built in right gas scarce areas, produces high-quality DRI, product cost significantly reduces.
4) by being exchanged heat with cold iron ore, and the sensible heat of 400-500 DEG C of cooling tail-gas is reclaimed.
To achieve these goals, the present invention adopts the following technical scheme that：
According to an aspect of the present invention, there is provided it is a kind of using the system for being pyrolyzed oil gas smelting DRI, including：
Pyrolysis oven, pyrolysis oven are used to produce high temperature pyrolysis of oil and gas, and pyrolysis oven is provided with pyrolysis oil gas vent；
Heater, heater are provided with first entrance and first outlet, first entrance and pyrolysis oil gas outlet；
Gas-based shaft kiln, gas-based shaft kiln are provided with cooling gas entrance, also Primordial Qi entrance, second entrance, second outlet, top gas
Outlet and the first cooling tail-gas outlet, also Primordial Qi entrance connect with first outlet, and second entrance is for receiving iron ore, and second
Export for discharging direct-reduction iron product.
According to one embodiment of present invention, heater is afterburning furnace.
According to one embodiment of present invention, in addition to：
Hopper, the top of hopper are provided with iron ore entrance；
Upper dipleg, the top of upper dipleg connect with the bottom of hopper；
Pre-heating cabin, pre-heating cabin are provided with the 3rd entrance, the 3rd outlet, the first cooling tail-gas entrance and the second cooling gas tail
Gas exports, and the 3rd entrance connect with the bottom of upper dipleg, and the 3rd outlet connects with second entrance, first cool down tail-gas entrance and
First cooling tail-gas outlet.
According to one embodiment of present invention, blanket gas entrance and blanket gas outlet are provided with the side of upper dipleg.
According to one embodiment of present invention, the length of upper dipleg is 4m-8m, a diameter of 0.3m-0.5m.
According to one embodiment of present invention, in addition to：
Water scrubber, water scrubber are provided with the 4th entrance and the 4th outlet, and the 4th entrance and the second cooling tail-gas outlet connect
It is logical；
Compressor, compressor are provided with the 5th entrance and the 5th outlet, the 5th entrance and the 4th outlet, the 5th outlet
Connected with cooling gas entrance.
According to one embodiment of present invention, in addition to：
Washing purifying device, washing purifying device are provided with the 6th entrance, the 6th outlet and pyrolysis oil export, the 6th entrance
Exported with top gas outlet, the 6th for discharging purification top gas, the first entrance of pyrolysis oil export connection heater.
According to another aspect of the present invention, a kind of method that DRI is smelted using said system is also provided, including
Following steps：
1) pyrolysis oven production high temperature pyrolysis of oil and gas are utilized；
2) obtained high temperature pyrolysis of oil and gas are passed through after being heated in heater and form also Primordial Qi；
3) the also Primordial Qi of formation is passed through in gas-based shaft kiln, reacts to obtain direct-reduction iron product with iron ore.
According to one embodiment of present invention, in addition to step：
21) iron ore is entered in gas-based shaft kiln after hopper is added, preheated by upper dipleg into pre-heating cabin.
According to one embodiment of present invention, it is included in the sealing system being made up of at dipleg combustion tail gas or nitrogen
Carry out dynamic sealing.
According to one embodiment of present invention, in addition to step：
Step 3 also includes, 31) cooling gas is passed through in the bottom of gas-based shaft kiln, direct-reduction iron product is subjected to cooling shape
Into the first cooling tail-gas, the first cooling tail-gas being cooled into is passed into pre-heating cabin to iron ore after gas-based shaft kiln discharge
Stone carries out pre- thermosetting second and cools down tail-gas, and the second cooling tail-gas of pre- thermosetting is washed through water scrubber and compressor compresses
It is passed into again as cooling gas in gas-based shaft kiln afterwards and direct-reduction iron product is cooled down.
According to one embodiment of present invention, in addition to step：
32) the top top gas outlet discharge by the top gas formed in gas-based shaft kiln from gas-based shaft kiln, scrubbed purification
Device dedusting dewater treatment, reclaim pyrolysis oil and form purification top gas, pyrolysis oil is sent into the first entrance heating of heater
High temperature pyrolysis of oil and gas are formed afterwards is sent into gas-based shaft kiln also Primordial Qi entrance.
According to one embodiment of present invention, preheating temperature is 200 DEG C -350 DEG C in step 21).
According to one embodiment of present invention, the Iron grade of iron ore is in 50%-70%.
According to one embodiment of present invention, step 1) high temperature pyrolysis oil gas tar content is 20g/Nm3-100g/Nm3。
According to one embodiment of present invention, heating-up temperature is 900 DEG C -1000 DEG C in step 2).
According to one embodiment of present invention, the temperature of the first cooling tail-gas is 400 DEG C -500 DEG C in step 31), the
The temperature of two cooling tail-gas is 150 DEG C -250 DEG C.
According to one embodiment of present invention, in step 31) by DRI product cooling to less than 80 DEG C.
By using above-mentioned technical proposal, the present invention has the following advantages that compared to prior art：
1) sensible heat of 700-900 DEG C of high temperature pyrolysis of oil and gas of pyrolysis oven production is fully used, energy utilization efficiency
High, system energy consumption substantially reduces, and the gas-based shaft kiln sponge iron energy consumption thereby resulted in reduces 0.1-0.3Gcal/DRI, without
Build complicated wash cooling purification, decoking takes off the devices such as benzene, reduction investment.
2) be pyrolyzed oil gas only need to directly be heat-fed to shaft furnace after simple heater supplementary heating, without using a large amount of high
Expensive reforming catalyst, system are simplified, and maintenance cost is low.
3) without using substantial amounts of natural gas, and raw material production also Primordial Qi is done using cheap low-order coal so that day
Gas-based shaft kiln production line is built in right gas scarce areas, produces high-quality DRI, product cost significantly reduces.It is adapted to " rich
Gas-based shaft kiln project is built in the area of the few gas of coal ".
4) organic matter such as tar containing 20-100g/Nm3 in oil gas is pyrolyzed, will be analysed after gas temperature is less than 450 DEG C
Go out into liquid and be bonded on pipeline, valve, instrument, burner hearth or pelletizing, so as to influence the normal fortune of equipment, valve, instrument
OK, therefore it need to ensure to enter the temperature of washing purifying device by shaft furnace top gas that (now top gas goes out shaft furnace temperature about higher than 450 DEG C
500℃)., can be by being added to stove also on the basis of identical sponge iron yield to ensure about 500 DEG C of top gas temperature
The amount of Primordial Qi, but can so increase the consumption of also Primordial Qi (pyrolysis oil gas), and cause to increase energy consumption, reduce economic benefit.This hair
It is bright to be exchanged heat by using 400-500 DEG C of cooling tail-gas 1 with cold iron ore, iron ore is first preheating to 200-300
DEG C shaft furnace is put into again, such shaft furnace top gas temperature will be above 500 DEG C.So under conditions of without increasing reduction tolerance, both
Shaft furnace top gas temperature is higher than 500 DEG C, avoid the organic matters such as the tar in top gas and separate out and be bonded on equipment or pelletizing；
The sensible heat of 400-500 DEG C of cooling tail-gas is also taken full advantage of simultaneously；This external cause enter water scrubber cooling tail-gas temperature by
400-500 DEG C is reduced to 150-250 DEG C, therefore the cooling water inflow for being used to wash cooling dedusting in water scrubber can reduce about 40-60%.
Brief description of the drawings
Fig. 1 is that utilization according to a preferred embodiment of the invention is pyrolyzed the system schematic that oil gas smelts DRI；
Fig. 2 is the process chart of the system smelting DRI using Fig. 1 according to a preferred embodiment of the invention.
Description of reference numerals
10 pyrolysis ovens, 11 pyrolysis oil gas vents, 20 heaters, 21 first entrances, 22 first outlets, 30 gas-based shaft kilns,
31 second entrances, 32 second outlets, 33 also Primordial Qi entrance, 34 cooling gas entrances, the outlet of 35 top gases, 36 first cooling tail-gas
Outlet, 40 hoppers, 41 iron ore entrances, dipleg, 51 blanket gas entrances, the outlet of 52 blanket gas, 60 pre-heating cabins, 61 the 3rd on 50
Entrance, 62 the 3rd outlets, 63 first cooling tail-gas entrances, 64 second cooling tail-gas outlets, 70 scrubbing towers, the 71, the 4th enter
Mouth, 72 the 4th outlets, 80 compressors, 81 the 5th entrances, 82 the 5th outlets, 90 washing purifying devices, 91 the 6th entrances, 92 the 6th
Outlet, 93 pyrolysis oil exports.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with the accompanying drawings and embodiment, it is right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
Such as Fig. 1, shown in Fig. 2, the present invention provides a kind of system for utilizing and being pyrolyzed oil gas smelting DRI, including：Heat
Stove 10 is solved, pyrolysis oven 10 is used to produce high temperature pyrolysis of oil and gas, and pyrolysis oven 10 is provided with pyrolysis oil gas vent 11；Heater 20,
Heater 20 is provided with first entrance 21 and first outlet 22, and first entrance 21 connects with pyrolysis oil gas vent 11；Gas base erects
Stove 30, gas-based shaft kiln 30 is provided with cooling gas entrance 34, also Primordial Qi entrance 33, second entrance 31, second outlet 32, top gas goes out
The cooling tail-gas outlet 36 of mouth 35 and first, also Primordial Qi entrance 33 connects with first outlet 22, and second entrance 31 is used to receive iron
Ore, second outlet 32 are used to discharge direct-reduction iron product.
In the system of the present invention, heater 20 is afterburning furnace.
By the said system of the present invention, 700-900 DEG C of high temperature pyrolysis of oil and gas of pyrolysis oven of the invention production show
Heat is fully used, and energy utilization efficiency is high, system energy consumption substantially reduces, the gas-based shaft kiln sponge iron production energy thereby resulted in
Consumption reduces 0.1-0.3Gcal/DRI, and without building complicated wash cooling purification, decoking takes off the devices such as benzene, reduces investment.This hair
Bright pyrolysis oil gas only need to be directly heat-fed to shaft furnace after simple heater supplementary heating, without using a large amount of expensive reformations
Catalyst, system are simplified, and maintenance cost is low.In addition, it is of the invention without using substantial amounts of natural gas, and use cheap
Low-order coal do raw material production also Primordial Qi so that natural gas scarce areas build gas-based shaft kiln production line, production it is high-quality directly go back
Former iron, product cost significantly reduce.It is adapted to build gas-based shaft kiln project in the area of " the few gas of rich coal ".
In the preferred embodiment of the invention, the system also includes：Hopper 40, the top of hopper 40 are provided with iron ore
Stone entrance 41；Upper dipleg 50, the top of upper dipleg 50 connect with the bottom of hopper 40；Pre-heating cabin 60, pre-heating cabin 60 are provided with
The 62, first cooling of 3rd entrance the 61, the 3rd outlet tail-gas entrance 63 and the second cooling tail-gas outlet 64, the 3rd entrance 61 with
The bottom connection of upper dipleg 50, the 3rd outlet 62 connect with second entrance 31, the first cooling tail-gas entrance 63 and the first cooling
The connection of tail-gas outlet 36.
In the preferred embodiment of the invention, blanket gas entrance 51 and blanket gas outlet are provided with the side of upper dipleg 50
52。
In the preferred embodiment of the invention, the length of upper dipleg 50 is 4m-8m, a diameter of 0.3m-0.5m.
By the technical scheme of above preferred embodiment, the present invention is connected with combustion tail gas at upper dipleg 50 or nitrogen is formed
Blanket gas carry out dynamic sealing, can prevent in pre-heating cabin 60 containing a large amount of CO, H2 coal gas it is excessive.
In preferred embodiment of the invention, the system further comprises：Water scrubber 70, water scrubber 70 are provided with
Four entrances 71 and the 4th outlet 72, the 4th entrance 71 connect with the second cooling tail-gas outlet 64；Compressor 80, compressor 80 are set
The 5th entrance 81 and the 5th outlet 82 are equipped with, the 5th entrance 81 connects with the 4th outlet 72, the 5th outlet 82 and cooling gas entrance
34 connections.
In preferred embodiment of the invention, the system also includes：Washing purifying device 90, washing purifying device 90 are set
The 6th entrance the 91, the 6th outlet 92 and pyrolysis oil export 93 are equipped with, the 6th entrance 91 connects with top gas outlet 35, the 6th outlet
92 are used to discharge purification top gas, and pyrolysis oil export 93 connects the first entrance 21 of heater 20.
By the technical scheme of above-mentioned more preferred embodiment, the present invention is pyrolyzed the tar containing 20-100g/Nm3 in oil gas
Deng organic matter, it will separate out into liquid after gas temperature is less than 450 DEG C and be bonded at pipeline, valve, instrument, burner hearth or ball
In group, so as to influence the normal operation of equipment, valve, instrument, therefore it need to ensure that shaft furnace top gas enters the temperature of washing purifying device
Degree is higher than 450 DEG C (now top gas goes out about 500 DEG C of shaft furnace temperature).To ensure about 500 DEG C of top gas temperature, in identical sponge
, can be by being added to the amount of stove also Primordial Qi on the basis of iron yield, but can so increase the consumption of also Primordial Qi (pyrolysis oil gas),
And cause to increase energy consumption, reduce economic benefit.Cooling tail-gas 1 and cold iron ore of the present invention by using 400-500 DEG C
Exchanged heat, iron ore first is preheating into 200-300 DEG C puts into shaft furnace again, and such shaft furnace top gas temperature will be above 500 DEG C.This
Sample had both made shaft furnace top gas temperature be higher than 500 DEG C, and had avoided the tar in top gas under conditions of without increasing reduction tolerance
Separate out and be bonded on equipment or pelletizing Deng organic matter；The sensible heat of 400-500 DEG C of cooling tail-gas is also taken full advantage of simultaneously；In addition
Because the cooling tail-gas temperature for entering water scrubber is reduced to 150-250 DEG C by 400-500 DEG C, therefore it is used to wash cooling in water scrubber
The cooling water inflow of dedusting can reduce about 40-60%.
In addition, by the technical scheme of above-mentioned more preferred embodiment, the present invention can be net by the top gas in gas-based shaft kiln
Change, form purification top gas, and pyrolysis oil is reclaimed, play the effect of environmental protection.
As shown in Fig. 2 the present invention also correspondingly provides a kind of method that DRI is smelted using said system, including
Step：High temperature pyrolysis of oil and gas are produced using pyrolysis oven 10；Obtained high temperature pyrolysis of oil and gas are passed through in heater 20 and added
Also Primordial Qi is formed after heat；The also Primordial Qi of formation is passed through in gas-based shaft kiln 30, reacts to obtain DRI with iron ore
Product.
In the preferred embodiment of the invention, this method also includes step：Iron ore is added, by upper through hopper 40
Dipleg 50 is entered in gas-based shaft kiln 30 after being preheated into pre-heating cabin 60.
In the preferred embodiment of the invention, it is included in the sealing system being made up of at dipleg 50 combustion tail gas or nitrogen
System carries out dynamic sealing.
In the preferred embodiment of the invention, method also includes step：Cooling gas is passed through in the bottom of gas-based shaft kiln 30, will
Direct-reduction iron product carries out being cooled into the first cooling tail-gas, and first be cooled into cools down tail-gas from gas-based shaft kiln 30
It is passed into after discharge in pre-heating cabin 60 and the pre- cooling of thermosetting second tail-gas is carried out to iron ore, the second cooling gas of pre- thermosetting
Tail gas is passed into gas-based shaft kiln 30 to direct-reduction as cooling gas again after the washing of water scrubber 70 and compressor 80 are compressed
Iron product is cooled down.
In the preferred embodiment of the invention, method also includes step：By the top gas formed in gas-based shaft kiln 30 from gas
The discharge of top top gas outlet 35 of base shaft furnace 30, the scrubbed dedusting dewater treatment of purifier 90, reclaims pyrolysis oil and is formed
Top gas is purified, pyrolysis oil forms high temperature pyrolysis of oil and gas feeding gas-based shaft kiln after being sent into the heating of first entrance 21 of heater 20
30 also Primordial Qi entrance 33.
In the preferred embodiment of the invention, it is 200 DEG C -350 DEG C that iron ore, which enters the temperature that pre-heating cabin 60 is preheated,.
In the preferred embodiment of the invention, the Iron grade of iron ore is in 50%-70%.
For root in the preferred embodiment of the invention, the high temperature pyrolysis of oil and gas tar content of production is 20g/Nm3-100g/Nm3。
In the preferred embodiment of the invention, the heating-up temperature of heater 20 is 900 DEG C -1000 DEG C.
In the preferred embodiment of the invention, the temperature of the first cooling tail-gas is 400 DEG C -500 DEG C, the second cooling gas tail
The temperature of gas is 150 DEG C -250 DEG C.
In the preferred embodiment of the invention, by DRI product cooling to less than 80 DEG C.
As can be seen here, the invention discloses a kind of System and method for for being pyrolyzed oil gas and smelting production DRI.Coal
The high temperature pyrolysis of oil and gas of pyrolysis oven production are passed through reduction shaft furnace iron ore after concurrent heating stove heat.Concrete technology and equipment can be general
State as follows：
Iron ore moves towards：Iron ore (acid pellet or lump ore) transports hopper at the top of shaft furnace, by elongated feeding
Enter pre-heating cabin after leg, shaft furnace is put into after iron ore is preheated to 200-350 DEG C in pre-heating cabin.Iron ore priority in shaft furnace
By preheat again, reduce, cool down after formed qualified sponge iron product from shaft furnace bottom discharge.
Reduction make leave with rage to：The high temperature pyrolysis of oil and gas (tar content 20-100g/Nm3) of pyrolysis oven production, through concurrent heating stove heat
Temperature is improved to the upward reducing iron ore of gas-based shaft kiln adverse current is passed through after 900-1000 DEG C in the middle part of shaft furnace, forms 500-600 DEG C
Top gas goes out from vertical furnace top row, the scrubbed purifying and dedusting dewater treatment of top gas, reclaims pyrolysis oil, and form net top gas.
Cooling make leave with rage to：Discharge for sponge iron is cooled into 100 DEG C (preventing re-oxidation), lead in shaft furnace bottom again below
Enter to cool down gas, 400-500 DEG C of cooling tail-gas 1 is formed after sponge iron is cooled down and discharges shaft furnace, then is passed through pre-heating cabin to entering shaft furnace
Preceding iron ore is preheated, and is then formed 150-250 DEG C of cooling tail-gas 2 and is discharged, and is washed through water scrubber, compressor pressurization
After be passed through shaft furnace bottom cycle utilization.To prevent from containing a large amount of CO, H in pre-heating cabin2Coal gas it is excessive, combustion is connected with upper dipleg
Burn the blanket gas that tail gas or nitrogen are formed and carry out dynamic sealing.
Connection between apparatus：Hopper has top iron ore entrance, and lower section is connected with upper dipleg.Upper dipleg side
For blanket gas entrance and outlet, lower section is connected with pre-heating cabin, is connected below pre-heating cabin with gas-based shaft kiln, also has cooling tail-gas
1 entrance exports with cooling tail-gas 2.Gas-based shaft kiln has cold sponge iron (CDRI) outlet, cools down gas entrance, cools down tail-gas 1
Outlet, also Primordial Qi entrance, top gas outlet；Wherein cooling gas entrance be connected with compressor outlet, cooling tail-gas 1 outlet with advance
The hot storehouse cooling entrance of tail-gas 1 is connected, and top gas outlet is connected with washing purifying device.Suction port of compressor exports phase with water scrubber
Even, water scrubber entrance is connected with the outlet of pre-heating cabin cooling tail-gas 2.Wash cooling device also has pyrolysis oil export and purification furnace
Top gas exports, and also Primordial Qi entrance is connected with concurrent heating outlet of still, and afterburning furnace entrance is connected with the outlet of pyrolysis oven high temperature pyrolysis gas.
Referring to specific embodiment, the present invention will be described.
Embodiment 1
As shown in Figure 1-2, the present invention is as follows using the technique for being pyrolyzed oil gas smelting DRI：
Iron ore moves towards：The iron ore concentrate lump ore of Iron grade 67% transports hopper 40, through long 6m, diameter 0.4m it is thin
Enter after long upper dipleg 50 in pre-heating cabin 60, gas-based shaft kiln 30 is put into after iron ore is preheated to 200 DEG C in pre-heating cabin 60
In；
Reduction make leave with rage to：Pyrolysis oven 10 is pyrolyzed the high temperature pyrolysis of oil and gas (tar content 20g/Nm3) of lignite production, through concurrent heating
The heating of stove 20 improves temperature and is passed into the upward reducing iron ore of adverse current in gas-based shaft kiln 30 as also Primordial Qi to after 930 DEG C, is formed
500 DEG C of top gases and obtain being reduced directly iron product, 500 DEG C of top gases are discharged from the top of gas-based shaft kiln 30, scrubbed purification
The dedusting dewater treatment of device 90, pyrolysis oil is reclaimed, and form net top gas；
Cooling make leave with rage to：Discharged again for sponge iron is cooled into 80 DEG C, cooling gas is passed through in the bottom of gas-based shaft kiln 30, will be straight
400 DEG C of cooling discharge gas-based shaft kilns 30 of tail-gas 1 are formed after connecing reduced iron cooling, then are passed through pre-heating cabin 60 to the iron before entering shaft furnace
Ore is preheated, and is then formed 250 DEG C of cooling tail-gas 2 and is discharged, is passed through after water scrubber 70 washs, compressor 80 pressurizes
The bottom cycle of shaft furnace 30 utilizes, to prevent from containing a large amount of CO, H in pre-heating cabin 602Coal gas it is excessive, be connected with combustion at upper dipleg 50
Burn the blanket gas that tail gas is formed and carry out dynamic sealing；
Iron ore in the shaft furnace 30 successively by preheat again, reduce, cool down after form full iron 90%, degree of metalization 93%
Sponge iron product is discharged from the bottom of shaft furnace 30.
Embodiment 2
As shown in Figure 1-2, the present invention is as follows using the technique for being pyrolyzed oil gas smelting DRI：
Iron ore moves towards：The iron ore concentrate lump ore of Iron grade 57% transports hopper 40, through long 6m, diameter 0.4m it is thin
Enter after long upper dipleg 50 in pre-heating cabin 60, gas-based shaft kiln 30 is put into after iron ore is preheated to 350 DEG C in pre-heating cabin 60
In；
Reduction make leave with rage to：Pyrolysis oven 10 is pyrolyzed the high temperature pyrolysis of oil and gas (tar content 100g/Nm3) of lignite production, through mending
The heating of hot stove 20 improves temperature and is passed into the upward reducing iron ore of adverse current, shape in gas-based shaft kiln 30 as also Primordial Qi to after 980 DEG C
Into 600 DEG C of top gases and obtain being reduced directly iron product, 600 DEG C of top gases are discharged from the top of gas-based shaft kiln 30, scrubbed net
90 dedusting dewater treatments are put in makeup, reclaim pyrolysis oil, and form net top gas；
Cooling make leave with rage to：Discharged again for sponge iron is cooled into 80 DEG C, cooling gas is passed through in the bottom of gas-based shaft kiln 30, will be straight
500 DEG C of cooling discharge gas-based shaft kilns 30 of tail-gas 1 are formed after connecing reduced iron cooling, then are passed through pre-heating cabin 60 to the iron before entering shaft furnace
Ore is preheated, and is then formed 150 DEG C of cooling tail-gas 2 and is discharged, is passed through after water scrubber 70 washs, compressor 80 pressurizes
The bottom cycle of shaft furnace 30 utilizes, to prevent from containing a large amount of CO, H in pre-heating cabin 602Coal gas it is excessive, be connected with combustion at upper dipleg 50
Burn the blanket gas that tail gas is formed and carry out dynamic sealing；
Iron ore in the shaft furnace 30 successively by preheat again, reduce, cool down after form full iron 68%, degree of metalization 90%
Sponge iron product is discharged from the bottom of shaft furnace 30.
Embodiment 3
As shown in Figure 1-2, the present invention is as follows using the technique for being pyrolyzed oil gas smelting DRI：
Iron ore moves towards：The iron ore concentrate lump ore of Iron grade 50% transports hopper 40, through long 4m, diameter 0.5m it is thin
Enter after long upper dipleg 50 in pre-heating cabin 60, gas-based shaft kiln 30 is put into after iron ore is preheated to 300 DEG C in pre-heating cabin 60
In；
Reduction make leave with rage to：Pyrolysis oven 10 is pyrolyzed the high temperature pyrolysis of oil and gas (tar content 80g/Nm3) of lignite production, through concurrent heating
The heating of stove 20 improves temperature and is passed into the upward reducing iron ore of adverse current in gas-based shaft kiln 30 as also Primordial Qi to after 1000 DEG C, is formed
700 DEG C of top gases and obtain being reduced directly iron product, 700 DEG C of top gases are discharged from the top of gas-based shaft kiln 30, scrubbed purification
The dedusting dewater treatment of device 90, pyrolysis oil is reclaimed, and form net top gas；
Cooling make leave with rage to：Discharged again for sponge iron is cooled into 75 DEG C, cooling gas is passed through in the bottom of gas-based shaft kiln 30, will be straight
450 DEG C of cooling discharge gas-based shaft kilns 30 of tail-gas 1 are formed after connecing reduced iron cooling, then are passed through pre-heating cabin 60 to the iron before entering shaft furnace
Ore is preheated, and is then formed 200 DEG C of cooling tail-gas 2 and is discharged, is passed through after water scrubber 70 washs, compressor 80 pressurizes
The bottom cycle of shaft furnace 30 utilizes, to prevent from containing a large amount of CO, H in pre-heating cabin 602Coal gas it is excessive, be connected with combustion at upper dipleg 50
Burn the blanket gas that tail gas is formed and carry out dynamic sealing；
Iron ore in the shaft furnace 30 successively by preheat again, reduce, cool down after form full iron 80%, degree of metalization 92%
Sponge iron product is discharged from the bottom of shaft furnace 30.
Embodiment 4
As shown in Figure 1-2, the present invention is as follows using the technique for being pyrolyzed oil gas smelting DRI：
Iron ore moves towards：The iron ore concentrate lump ore of Iron grade 70% transports hopper 40, through long 8m, diameter 0.3m it is thin
Enter after long upper dipleg 50 in pre-heating cabin 60, gas-based shaft kiln 30 is put into after iron ore is preheated to 320 DEG C in pre-heating cabin 60
In；
Reduction make leave with rage to：Pyrolysis oven 10 is pyrolyzed the high temperature pyrolysis of oil and gas (tar content 40g/Nm3) of lignite production, through concurrent heating
The heating of stove 20 improves temperature and is passed into the upward reducing iron ore of adverse current in gas-based shaft kiln 30 as also Primordial Qi to after 900 DEG C, is formed
450 DEG C of top gases and obtain being reduced directly iron product, 450 DEG C of top gases are discharged from the top of gas-based shaft kiln 30, scrubbed purification
The dedusting dewater treatment of device 90, pyrolysis oil is reclaimed, and form net top gas；
Cooling make leave with rage to：Discharged again for sponge iron is cooled into 60 DEG C, cooling gas is passed through in the bottom of gas-based shaft kiln 30, will be straight
500 DEG C of cooling discharge gas-based shaft kilns 30 of tail-gas 1 are formed after connecing reduced iron cooling, then are passed through pre-heating cabin 60 to the iron before entering shaft furnace
Ore is preheated, and is then formed 250 DEG C of cooling tail-gas 2 and is discharged, is passed through after water scrubber 70 washs, compressor 80 pressurizes
The bottom cycle of shaft furnace 30 utilizes, to prevent from containing a large amount of CO, H in pre-heating cabin 602Coal gas it is excessive, be connected with combustion at upper dipleg 50
Burn the blanket gas that tail gas is formed and carry out dynamic sealing；
Iron ore in the shaft furnace 30 successively by preheat again, reduce, cool down after form full iron 70%, degree of metalization 90%
Sponge iron product is discharged from the bottom of shaft furnace 30.
Embodiment 5
As shown in Figure 1-2, the present invention is as follows using the technique for being pyrolyzed oil gas smelting DRI：
Iron ore moves towards：The iron ore concentrate lump ore of Iron grade 70% transports hopper 40, through long 6m, diameter 0.4m it is thin
Enter after long upper dipleg 50 in pre-heating cabin 60, gas-based shaft kiln 30 is put into after iron ore is preheated to 350 DEG C in pre-heating cabin 60
In；
Reduction make leave with rage to：Pyrolysis oven 10 is pyrolyzed the high temperature pyrolysis of oil and gas (tar content 60g/Nm3) of lignite production, through concurrent heating
The heating of stove 20 improves temperature and is passed into the upward reducing iron ore of adverse current in gas-based shaft kiln 30 as also Primordial Qi to after 950 DEG C, is formed
500 DEG C of top gases and obtain being reduced directly iron product, 500 DEG C of top gases are discharged from the top of gas-based shaft kiln 30, scrubbed purification
The dedusting dewater treatment of device 90, pyrolysis oil is reclaimed, and form net top gas；
Cooling make leave with rage to：Discharged again for sponge iron is cooled into 70 DEG C, cooling gas is passed through in the bottom of gas-based shaft kiln 30, will be straight
420 DEG C of cooling discharge gas-based shaft kilns 30 of tail-gas 1 are formed after connecing reduced iron cooling, then are passed through pre-heating cabin 60 to the iron before entering shaft furnace
Ore is preheated, and is then formed 200 DEG C of cooling tail-gas 2 and is discharged, is passed through after water scrubber 70 washs, compressor 80 pressurizes
The bottom cycle of shaft furnace 30 utilizes, to prevent from containing a large amount of CO, H in pre-heating cabin 602Coal gas it is excessive, be connected with combustion at upper dipleg 50
Burn the blanket gas that tail gas is formed and carry out dynamic sealing；
Iron ore in the shaft furnace 30 successively by preheat again, reduce, cool down after form full iron 85%, degree of metalization 94%
Sponge iron product is discharged from the bottom of shaft furnace 30.
Presently preferred embodiments of the present invention is the foregoing is only, is not used for limiting the practical range of the present invention；If do not take off
From the spirit and scope of the present invention, the present invention is modified or equivalent substitution, all should covered in the claims in the present invention
Among protection domain.
Claims (10)
1. a kind of utilize the system for being pyrolyzed oil gas smelting DRI, it is characterised in that including：
Pyrolysis oven, the pyrolysis oven are used to produce high temperature pyrolysis of oil and gas, and the pyrolysis oven is provided with pyrolysis oil gas vent；
Heater, the heater are provided with first entrance and first outlet, the first entrance and the pyrolysis oil gas
Outlet；
Gas-based shaft kiln, the gas-based shaft kiln are provided with cooling gas entrance, also Primordial Qi entrance, second entrance, second outlet, top gas
Outlet and the first cooling tail-gas outlet, the also Primordial Qi entrance connect with the first outlet, and the second entrance is used to connect
Iron ore is received, the second outlet is used to discharge direct-reduction iron product.
2. according to claim 1 utilize the system for being pyrolyzed oil gas smelting DRI, it is characterised in that also includes：
Hopper, the top of the hopper are provided with iron ore entrance；
Upper dipleg, the top of the upper dipleg connect with the bottom of the hopper；
Pre-heating cabin, the pre-heating cabin are provided with the 3rd entrance, the 3rd outlet, the first cooling tail-gas entrance and the second cooling gas tail
Gas exports, and the 3rd entrance connects with the bottom of the upper dipleg, and the 3rd outlet connects with the second entrance, described
First cooling tail-gas entrance and the described first cooling tail-gas outlet.
3. according to claim 2 utilize the system for being pyrolyzed oil gas smelting DRI, it is characterised in that the feeding
Blanket gas entrance and blanket gas outlet are provided with the side of leg.
4. according to claim 3 utilize the system for being pyrolyzed oil gas smelting DRI, it is characterised in that also includes：
Water scrubber, the water scrubber are provided with the 4th entrance and the 4th outlet, the 4th entrance and the described second cooling gas tail
Gas outlet；
Compressor, the compressor are provided with the 5th entrance and the 5th outlet, the 5th entrance and the 4th outlet,
5th outlet connects with the cooling gas entrance.
5. according to claim 4 utilize the system for being pyrolyzed oil gas smelting DRI, it is characterised in that also includes：
Washing purifying device, the washing purifying device are provided with the 6th entrance, the 6th outlet and are pyrolyzed oil export, and the described 6th
Entrance and the top gas outlet, the described 6th exports for discharging purification top gas, the pyrolysis oil export connection institute
State the first entrance of heater.
6. a kind of method that system using as any one of claim 1-5 smelts DRI, it is characterised in that
Comprise the following steps：
1) pyrolysis oven production high temperature pyrolysis of oil and gas are utilized；
2) obtained high temperature pyrolysis of oil and gas are passed through after being heated in heater and form also Primordial Qi；
3) the also Primordial Qi of formation is passed through in gas-based shaft kiln, reacts to obtain direct-reduction iron product with iron ore.
7. according to the method for claim 6, it is characterised in that also including step：
21) iron ore is entered in gas-based shaft kiln after hopper is added, preheated by upper dipleg into pre-heating cabin.
8. according to the method for claim 7, it is characterised in that be included at dipleg and be made up of combustion tail gas or nitrogen
Sealing system carry out dynamic sealing.
9. according to the method for claim 8, it is characterised in that also including step：
Step 3 also includes, 31) cooling gas is passed through in the bottom of gas-based shaft kiln, direct-reduction iron product is carried out to being cooled into the
One cooling tail-gas, the first cooling tail-gas being cooled into are passed into pre-heating cabin to enter iron ore after gas-based shaft kiln discharge
The pre- thermosetting second of row cools down tail-gas, the second cooling tail-gas of pre- thermosetting after water scrubber washing and compressor compresses again
Secondary be passed into as cooling gas in gas-based shaft kiln cools down to direct-reduction iron product.
10. according to the method for claim 9, it is characterised in that also including step：
32) the top top gas outlet discharge by the top gas formed in gas-based shaft kiln from gas-based shaft kiln, scrubbed purifier
Dedusting dewater treatment, reclaim pyrolysis oil and form purification top gas, pyrolysis oil is sent into shape after the first entrance heating of heater
Gas-based shaft kiln also Primordial Qi entrance is sent into high temperature pyrolysis of oil and gas.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710770960.XA CN107400747A (en) | 2017-08-31 | 2017-08-31 | A kind of system and method using oil gas smelting DRI is pyrolyzed |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710770960.XA CN107400747A (en) | 2017-08-31 | 2017-08-31 | A kind of system and method using oil gas smelting DRI is pyrolyzed |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111926135A (en) * | 2020-07-14 | 2020-11-13 | 钢研晟华科技股份有限公司 | Hydrogen-based shaft furnace direct reduction system and reduction method |
| CN111979371A (en) * | 2020-07-31 | 2020-11-24 | 太原理工大成工程有限公司 | Method for distributed utilization of heat in process of producing direct reduced iron by dry quenching coupled shaft furnace |
| CN113403441A (en) * | 2021-06-17 | 2021-09-17 | 北京金博威科技有限公司 | Production method, production system and application of granular direct reduced iron |
-
2017
- 2017-08-31 CN CN201710770960.XA patent/CN107400747A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111926135A (en) * | 2020-07-14 | 2020-11-13 | 钢研晟华科技股份有限公司 | Hydrogen-based shaft furnace direct reduction system and reduction method |
| CN111926135B (en) * | 2020-07-14 | 2022-03-29 | 钢研晟华科技股份有限公司 | Hydrogen-based shaft furnace direct reduction system and reduction method |
| CN111979371A (en) * | 2020-07-31 | 2020-11-24 | 太原理工大成工程有限公司 | Method for distributed utilization of heat in process of producing direct reduced iron by dry quenching coupled shaft furnace |
| CN113403441A (en) * | 2021-06-17 | 2021-09-17 | 北京金博威科技有限公司 | Production method, production system and application of granular direct reduced iron |
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