CN107354260A - A kind of system and method that DRI is smelted using clean pyrolysis gas - Google Patents
A kind of system and method that DRI is smelted using clean pyrolysis gas Download PDFInfo
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- CN107354260A CN107354260A CN201710771655.2A CN201710771655A CN107354260A CN 107354260 A CN107354260 A CN 107354260A CN 201710771655 A CN201710771655 A CN 201710771655A CN 107354260 A CN107354260 A CN 107354260A
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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 that DRI is smelted using clean pyrolysis gas, the system includes pyrolysis oven, cyclone separator, high temperature purification room 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；Present system and technique are simple, reduce production cost；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
Clean pyrolysis gas smelting is utilized the invention belongs to direct reduction processes of Iron ores field, and more particularly, to one kind
The system and method for refining 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 sensible heat that the existing system and method for smelting DRI have high temperature pyrolysis of oil and gas does not obtain abundant profit
It is low and the defects of cost is high with, efficiency of energy utilization.Therefore, a kind of system and method for new smelting DRI are
It is desired.
The content of the invention
In view of the above-mentioned problems, it is an object of the invention to provide a kind of system that DRI is smelted using clean pyrolysis gas
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 cool down without rinse dehydration, directly net through high temperature
Shaft furnace is sent into as reducing gas reducing iron ore after changing the clean pyrolysis gas that suitable temperature and composition are formed after room is handled.High temperature
The sensible heat of pyrolysis oil gas obtains fully efficiently utilizing, and efficiency of energy utilization is high.
2) high temperature pyrolysis of oil and gas produce the heat of cleaning after the reaction of high temperature purification room is except organic matters such as tar removing, benzene and naphthalenes
Vent one's spleen as reducing gas for shaft furnace, be not present the organic matter such as tar, benzene and naphthalene in such shaft furnace top gas, thus top gas only need by
Simple water scrubber carrying out washing treatment, without setting retracting device, the wastewater treatments such as complicated tar and benzene simple.Top gas is net
Change system is simplified, top gas is not present the condensations such as tar and benzene and bonds the harm such as pipe-line equipment, while tar, benzene and naphthalene etc.
Organic matter can generate the reducing agent H of shaft furnace reduction of iron ore after high temperature purification room is reacted2And CO, so as to reduce to pyrolysis oil
The consumption of gas, production cost is reduced, while also bring up to pyrolysis gas (also Primordial Qi) temperature required for reduction shaft furnace iron ore
Ask.
3) 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.
To achieve these goals, the present invention adopts the following technical scheme that：
According to an aspect of the present invention, there is provided a kind of system that DRI is smelted using clean pyrolysis gas, including：
Pyrolysis oven, pyrolysis oven are used to produce pyrolysis oil gas, and pyrolysis oven is provided with pyrolysis oil gas vent；
Cyclone separator, cyclone separator are provided with first entrance and first outlet, first entrance and pyrolysis oil gas vent
Connection；
High temperature purification room, high temperature purification room are provided with second entrance, oxygen intake and second outlet, second entrance with it is described
First outlet connects；
Gas-based shaft kiln, gas-based shaft kiln are provided with also Primordial Qi entrance, iron ore entrance, top gas outlet and products export, also
Primordial Qi entrance connects with second outlet.
According to one embodiment of present invention, in addition to：
Water scrubber, water scrubber are provided with the 3rd entrance and the 3rd outlet, the 3rd entrance and top gas outlet；
Compressor, compressor are provided with the 4th entrance and the 4th outlet, the 4th entrance and the 3rd outlet；
Desulfurization and decarburization processing unit, desulfurization and decarburization processing unit be provided with the 5th entrance and the 5th outlet, the 5th entrance with
4th outlet；
Heating furnace, heating furnace are provided with the 6th entrance, fuel inlet and the 6th outlet, and the 6th entrance and the 5th outlet connect
Logical, the 6th outlet is accessed between second outlet and also Primordial Qi entrance.
According to one embodiment of present invention, fuel inlet and the 3rd outlet.
According to one embodiment of present invention, high temperature purification room length is 2m-4m；High temperature purification room includes clean room, oxygen
Compression ring pipe and oxygen jet, oxygen endless tube are socketed on the periphery of clean room, and oxygen endless tube has oxygen inlet, and oxygen jet passes through
The tube wall of logical clean room simultaneously connects oxygen endless tube, for the oxygen in oxygen endless tube to be sprayed onto in high temperature purification room, oxygen jet
It is symmetrical arranged and quantity is 6-10.
According to one embodiment of present invention, it is respectively arranged with heat-insulation layer on the tube wall of clean room and oxygen endless tube.
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 pyrolysis oil gas is utilized；
2) the obtained pyrolysis oil gas in step 1) is passed through in cyclone separator and carries out dedusting；
3) be passed through oxygen into high temperature purification room, by the pyrolysis oil gas after dedusting in step 2) be passed through in high temperature purification room with
Oxygen is reacted, and generates clean pyrolysis gas；
4) clean pyrolysis gas 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：
31) top gas of gas-based shaft kiln is passed through into water scrubber to be washed, subsequently into carrying out pressurized treatments in compressor；
32) top gas after being handled in step 31) is passed through in desulfurization and decarburization processing unit and carries out desulfurization and decarburization；
33) fuel is added into heating furnace, the top gas in step 32) is passed through in heating furnace and carries out being thermally formed purification
Top gas；
34) the purification top gas formed in the clean pyrolysis gas of generation in step 3) and step 33) is mixed to form reduction
Gas, and be passed into gas-based shaft kiln.
According to one embodiment of present invention, in step 33), the fuel meat or all warps that are added into heating furnace
The top gas for the gas-based shaft kiln crossed after water scrubber processing.
According to one embodiment of present invention, the temperature of pyrolysis oil gas is 700 DEG C -900 DEG C in step 1).
According to one embodiment of present invention, the content of tar, benzene and naphthalene is 20g/Nm in the pyrolysis oil gas of step 1)3-
100g/Nm3, C1-C3Paraffin gas volumn concentration is 4%-12%.
According to one embodiment of present invention, it is characterised in that the powder that cyclone separator will be pyrolyzed in oil gas in step 2)
Dirt is controlled in 8g/Nm3Below.
According to one embodiment of present invention, the temperature of step 3) high temperature clean room is 1000 DEG C -1250 DEG C.
According to one embodiment of present invention, the volume ratio of oxygen and pyrolysis oil gas is 0.03-0.15 in step 3)；With/
Or, CH in clean pyrolysis gas4Volume content be 2%-4%；And/or clean pyrolysis gas is with the volume ratio for being pyrolyzed oil gas
1.1-1.4。
According to one embodiment of present invention, the temperature of the top gas of gas-based shaft kiln is 350 DEG C -450 DEG C in step 31).
According to one embodiment of present invention, the temperature of purification top gas is 850 DEG C -950 DEG C in step 33).
According to one embodiment of present invention, the temperature of the also Primordial Qi formed in step 34) is 900 DEG C -1050 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) a set of cooling, decoking being made up of devices such as first cold tower, air blower, electrical tar precipitator and debenzolizing towers need not be built
And the pyrolysis Oil-gas Separation purification complication system of de- benzene, system process is simplified, reduces investment, without handling phenol-containing wastewater,
Reduction production cost is simultaneously more environmentally friendly.
3) be pyrolyzed oil gas only need to directly be heat-fed to shaft furnace after simple high temperature purification room is handled, without using a large amount of expensive
Reforming catalyst, system is simplified, and maintenance cost is low.
4) it is pyrolyzed in oil gas and contains 20-100g/Nm3The organic matter such as tar, benzene and naphthalene, be less than 450 DEG C in gas temperature
After will separate out into liquid and be bonded on pipeline, valve, instrument, burner hearth or pelletizing, so as to influence equipment, valve, instrument
Normal work；And if the pyrolysis oil gas directly wash after caused phenol-containing wastewater complex treatment process, processing cost it is high.In height
Oil gas is pyrolyzed in warm clean room through being reacted at high temperature with a certain amount of oxygen, the macromolecule organics such as tar, benzene and naphthalene are turned
It is melted into the reducing agent H needed for reduction shaft furnace iron ore2+ CO, tar when temperature will not occur for such top gas less than 450 DEG C again
It can be separated out Deng liquid and be bonded at the rough sledding of pipeline, valve, instrument；Sewage simultaneously after furnace roof gas washing is simply common
Sewage rather than phenol-containing wastewater, it is low to handle simple cost；Can also by-product be largely advantageous to the H of reducing iron ore2+CO；Additionally
Pyrolysis gas (also Primordial Qi) temperature is brought up into reduction shaft furnace iron ore necessary requirement.
Brief description of the drawings
Fig. 1 is the system signal that DRI is smelted using clean pyrolysis gas according to a preferred embodiment of the invention
Figure；
Fig. 2 is the front view of Fig. 1 system high temperature clean room；
Fig. 3 is the side view of Fig. 1 system high temperature clean room；
Fig. 4 is the process chart of the system smelting DRI using Fig. 1 according to a preferred embodiment of the invention.
Description of reference numerals
1 pyrolysis oven, 11 pyrolysis oil gas vents, 2 cyclone separators, 21 first entrances, 22 first outlets, 3 high temperature purification rooms,
31 second entrances, 32 oxygen intakes, 33 second outlets, 34 oxygen endless tubes, 35 oxygen jets, 36 heat-insulation layers, 37 clean rooms, 4 gas
Base shaft furnace, 41 also Primordial Qi entrance, the outlet of 42 top gases, 43 iron ore entrances, 44 products exports, 5 water scrubbers, 51 the 3rd entrances,
52 the 3rd outlets, 6 compressors, 61 the 4th entrances, 62 the 4th outlets, 7 desulfating and deoxidation devices, 71 the 5th entrances, 72 the 5th outlet,
8 heating furnaces, 81 the 6th entrances, 82 fuel inlets, 83 the 6th outlets.
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.
As shown in figure 1, the present invention provides a kind of system that DRI is smelted using clean pyrolysis gas, including：Pyrolysis
Stove 1, pyrolysis oven 1 are used to produce pyrolysis oil gas, and pyrolysis oven 1 is provided with pyrolysis oil gas vent 11；Cyclone separator 2, cyclonic separation
Device 2 is provided with first entrance 21 and first outlet 22, and first entrance 21 connects with pyrolysis oil gas vent 11；High temperature purification room 3, it is high
Warm clean room 3 is provided with second entrance 31, oxygen intake 32 and second outlet 33, and second entrance 31 connects with first outlet 21；
Gas-based shaft kiln 4, gas-based shaft kiln 41 are provided with also Primordial Qi entrance 41, iron ore entrance 43, top gas outlet 42 and products export 44,
Also Primordial Qi entrance 41 connects with second outlet 33.
By the said system of the present invention, 700-900 DEG C of high temperature pyrolysis of oil and gas of pyrolysis oven production is aobvious in the present invention
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.And
And the present invention need not build a set of cooling, decoking being made up of devices such as first cold tower, air blower, electrical tar precipitator and debenzolizing towers
And the pyrolysis Oil-gas Separation purification complication system of de- benzene, system process is simplified, reduces investment, without handling phenol-containing wastewater,
Reduction production cost is simultaneously more environmentally friendly.In addition, the pyrolysis oil gas of the present invention only need to be directly warm after simple high temperature purification room is handled
Shaft furnace is delivered to, without using a large amount of expensive reforming catalysts, system is simplified, and maintenance cost is low.
Further, in a preferred embodiment of the invention, system of the invention also includes water scrubber 5, and water scrubber 5 is set
There are the 3rd entrance 51 and the 3rd outlet 52, the 3rd entrance 51 connects with top gas outlet 42；Compressor 6, compressor 6 are provided with
Four entrances 61 and the 4th outlet 62, the 4th entrance 62 connect with the 3rd outlet 52；Desulfurization and decarburization processing unit 7, at desulfurization and decarburization
Reason device 7 is provided with the 5th entrance 71 and the 5th outlet 72, and the 5th entrance 71 connects with the 4th outlet 62；Heating furnace 8, heating furnace
8 are provided with the 6th entrance 81, the outlet of fuel inlet 82 and the 6th 83, and the 6th entrance 81 connects with the 5th outlet 72, the 6th outlet
Between 83 access second outlets 33 and also Primordial Qi entrance 41.
In a preferred embodiment of the invention, fuel inlet 82 connects with the 3rd outlet 52.
In a preferred embodiment of the invention, as Figure 2-3, the length of high temperature purification room 3 is 2m-4m；High temperature purification room 3
Including clean room 37, oxygen endless tube 34 and oxygen jet 35, oxygen endless tube 34 is socketed on the periphery of clean room 37 and set
Close to one end of second entrance 31, oxygen endless tube 34 has oxygen inlet, and oxygen jet 35 penetrates the tube wall of clean room 37 simultaneously
Connect oxygen endless tube 34, for the oxygen in oxygen endless tube 34 to be sprayed onto in high temperature purification room 3, oxygen jet 35 be symmetrical arranged and
Quantity is 6-10.
Preferably, 6 oxygen jets 35 are circumferentially symmetrically distributed at 3 anterior 0.5m of high temperature purification room.
In a preferred embodiment of the invention, it is respectively arranged with heat-insulation layer on the tube wall of clean room 37 and oxygen endless tube 34
36。
In the preferred embodiment of the invention, desulfurization and decarburization processing unit is desulfurization and decarburization tower.
By the above preferred embodiment of the present invention, contain 20-100g/Nm in the pyrolysis oil gas in the present invention3Tar,
The organic matter such as benzene and naphthalene, it will separate out into liquid after gas temperature is less than 450 DEG C and be bonded at pipeline, valve, instrument, stove
On thorax or pelletizing, so as to influence the normal work of equipment, valve, instrument；And if contain caused by after the pyrolysis oil gas directly washing
Phenol sewage treatment process is complicated, processing cost is high.Oil gas is pyrolyzed in high temperature purification room to pass through with a certain amount of oxygen at high temperature
Reaction, the macromolecule organics such as tar, benzene and naphthalene is changed into the reducing agent H needed for reduction shaft furnace iron ore2+ CO, such stove
The liquid such as tar can separate out and be bonded at the unfavorable feelings of pipeline, valve, instrument when temperature will not occur for top gas less than 450 DEG C again
Condition；The sewage after furnace roof gas washing is common sewage rather than phenol-containing wastewater simultaneously, and it is low to handle simple cost；Can also by-product
A large amount of H for being advantageous to reducing iron ore2+CO；Pyrolysis gas (also Primordial Qi) temperature is additionally brought up into reduction shaft furnace iron ore institute
Need to ask.
As shown in figure 4, the present invention also correspondingly provides a kind of method that DRI is smelted using said system, bag
Include：1) the production pyrolysis oil gas of pyrolysis oven 1 is utilized；2) obtained pyrolysis oil gas is passed through in cyclone separator 2 and carries out dedusting；3) to
Oxygen is passed through in high temperature purification room 3, the pyrolysis oil gas after dedusting is passed through in high temperature purification room 3 and reacted with oxygen, is generated
Clean pyrolysis gas；Clean pyrolysis gas is passed through in gas-based shaft kiln 4, reacts to obtain direct-reduction iron product with iron ore.
In the preferred embodiment of the invention, this method also includes：The top gas of gas-based shaft kiln 4 is passed through into water scrubber 5 to enter
Row washing, subsequently into carrying out pressurized treatments in compressor 6；Top gas after processing is passed through in desulfurization and decarburization processing unit 7
Carry out desulfurization and decarburization；Fuel is added into heating furnace 8, top gas is passed through in heating furnace 8 and carries out being thermally formed purification top gas；
The clean pyrolysis gas of generation and the purification top gas formed are mixed to form also Primordial Qi, and being passed into gas-based shaft kiln 4.
In the preferred embodiment of the invention, the fuel meat that is added into heating furnace 8 or all by water scrubber 5
The top gas of gas-based shaft kiln 4 after reason.
In the preferred embodiment of the invention, the temperature for being pyrolyzed oil gas is 700 DEG C -900 DEG C.
In the preferred embodiment of the invention, the content for being pyrolyzed tar, benzene and naphthalene in oil gas is 20g/Nm3-100g/Nm3, C1-
C3Paraffin gas volumn concentration is 4%-12%.
In the preferred embodiment of the invention, cyclone separator 2 is by the dust Control being pyrolyzed in oil gas in 8g/Nm3Below.
In the preferred embodiment of the invention, the temperature of high temperature purification room 3 is 1000 DEG C -1250 DEG C.
In the preferred embodiment of the invention, the volume ratio of oxygen and pyrolysis oil gas is 0.03-0.15；In clean pyrolysis gas
CH4Volume content be 2%-4%；The volume ratio of clean pyrolysis gas and pyrolysis oil gas is 1.1-1.4.
In the preferred embodiment of the invention, the temperature of the top gas of gas-based shaft kiln 4 is 350 DEG C -450 DEG C.
In the preferred embodiment of the invention, the temperature for purifying top gas is 850 DEG C -950 DEG C.
In the preferred embodiment of the invention, the temperature of the also Primordial Qi of formation is 900 DEG C -1050 DEG C.
In summary, the invention discloses the System and method for that a kind of clean pyrolysis gas smelts DRI.Coal heat
The high temperature pyrolysis of oil and gas of solution stove production are passed through reduction shaft furnace iron ore after high temperature purification room is handled.
For more specifically, the high temperature pyrolysis of oil and gas of pyrolysis oven production, the dust control that will be pyrolyzed through cyclone dust removal in oil gas
System is in 8g/Nm3After below, it is passed through in 1000-1250 DEG C of high temperature purification room and the clean heat of a certain proportion of oxygen reaction generation
Vent one's spleen, be mixed to form with 850-950 DEG C of purification top gas and being passed through reduction shaft furnace iron ore after Primordial Qi, form 350-450 DEG C
Top gas after water scrubber washs, it is most of pressurizeed through compressor, desulfurization and decarburization processing, heating furnace are thermally formed purification furnace roof
Gas.After iron ore is reduced gas reduction, ultimately forms high-quality sponge iron product and discharged from shaft furnace bottom.
Wherein：
(1) it is 20-100g/Nm to be pyrolyzed tar, benzene and naphthalene equal size in oil gas3, C1-C3Paraffin gas content 4%-12%.
(2) oxygen and the pyrolysis oil air volume ratio that high temperature purification room sprays into are 0.03-0.15, in the clean pyrolysis gas of generation
CH4 contents are 2%-4%, and clean pyrolysis gas and the pyrolysis oil air volume ratio of generation are 1.1-1.4.
(3) high temperature purification room length about 2-4m, including clean room, and the oxygen endless tube of clean room periphery is socketed in, only
Change and be symmetrically distributed with 6-10 oxygen jet on the tube wall of room.In addition, clean room's tube wall is provided with one layer of heat preservation layer, on oxygen endless tube
One layer of heat preservation layer can be provided with.
Connection between apparatus：The oil gas vent of pyrolysis oven is connected with cyclone dust removal entrance, cyclone dust removal outlet and height
Warm clean room is connected, and high temperature purification cell structure is shown in Fig. 2 and Fig. 3, and high temperature purification room also there is oxygen intake to be exported with clean gas,
Gas-based shaft kiln has also Primordial Qi entrance, top gas outlet, iron ore entrance and DRI outlet, top gas outlet and washing
Tower entrance is connected, and water scrubber outlet is connected with suction port of compressor and furnace fuel entrance, compressor outlet and desulfurization and decarburization tower
Entrance is connected, and the outlet of desulfurization and decarburization tower is connected with heating furnace entrance, and heating furnace purification top gas outlet and high temperature purification room are clean
Pyrolysis gas outlet and reducing gas for shaft furnace entrance are connected.
Referring to specific embodiment, the present invention will be described.
Embodiment 1
As Figure 1-4,850 DEG C, 7.2 ten thousand Nm that pyrolysis oven 1 produces3/ h pyrolysis oil gas (is pyrolyzed tar, benzene in oil gas
And naphthalene equal size is 20g/Nm3, CH4Content 10%), through the dedusting of cyclone separator 2, by the dust Control being pyrolyzed in oil gas in 7g/
Nm3Behind left and right, being passed into 1100 DEG C of high temperature purification rooms 3, (length 3m, 6 oxygen jets 35 are circumferentially symmetrically distributed in high temperature
At the 0.5m of clean room front portion) in, in high temperature purification room 3 with 4300Nm3/ h oxygen reaction generates about 8.5 ten thousand Nm3/h、CH4Contain
The clean pyrolysis gas of amount 3%；400 DEG C of top gas caused by gas-based shaft kiln 4 is after the washing of water scrubber 5,80% adds through compressor 6
880 DEG C, 13.1 ten thousand Nm are formed after pressure, desulfurization and decarburization processing unit 7 carry out desulfurization and decarburization, heating furnace 8 heats3/ h purification furnace roof
Gas；The clean pyrolysis gas of generation and the purification top gas formed are mixed to form 940 DEG C of also Primordial Qi, and be passed into gas-based shaft kiln 4
The iron ore concentrate acid pellet of the middle full iron 67% of reduction, so as to obtain being reduced directly iron product.Finally from the production of the bottom of gas-based shaft kiln 4
120 tons/the h of discharge of product outlet 44, full Iron grade 91%, the DRI of degree of metalization 93%.
Embodiment 2
As Figure 1-4,850 DEG C, 6.5 ten thousand Nm that pyrolysis oven 1 produces3/ h pyrolysis oil gas (is pyrolyzed tar, benzene in oil gas
And naphthalene equal size is 100g/Nm3, CH4Content 5%), through the dedusting of cyclone separator 2, by the dust Control being pyrolyzed in oil gas in 7g/
Nm3Behind left and right, being passed into 1250 DEG C of high temperature purification rooms 3, (length 4m, 10 oxygen jets 35 are circumferentially symmetrically distributed in high temperature
At the 0.5m of clean room front portion) in, in high temperature purification room 3 with 9200Nm3/ h oxygen reaction generates about 8.5 ten thousand Nm3/h、CH4Contain
The clean pyrolysis gas of amount 2%；440 DEG C of top gas caused by gas-based shaft kiln 4 is after the washing of water scrubber 5,80% adds through compressor
850 DEG C, 13.3 ten thousand Nm are formed after pressure, desulfurization and decarburization processing unit 7 carry out desulfurization and decarburization, heating furnace 8 heats3/ h purification furnace roof
Gas；The clean pyrolysis gas of generation and the purification top gas formed are mixed to form 990 DEG C of also Primordial Qi, and be passed into gas-based shaft kiln 4
The iron ore concentrate acid pellet of the middle full iron 67% of reduction, so as to obtain being reduced directly iron product.Finally from the production of the bottom of gas-based shaft kiln 4
120 tons/the h of discharge of product outlet 44, full Iron grade 91%, the DRI of degree of metalization 93%.
Embodiment 3
As Figure 1-4,700 DEG C, 8.2 ten thousand Nm that pyrolysis oven 1 produces3/ h pyrolysis oil gas (is pyrolyzed tar, benzene in oil gas
And naphthalene equal size is 80g/Nm3, CH4Content 4%), through the dedusting of cyclone separator 2, the dust Control being pyrolyzed in oil gas is existed
6.5g/Nm3Behind left and right, being passed into 1000 DEG C of high temperature purification rooms 3, (length 2m, 8 oxygen jets 35 are circumferentially symmetrically distributed in
At the front portion 0.5m of high temperature purification room) in, in high temperature purification room 3 with 2460Nm3/ h oxygen reaction generates about 9.02 ten thousand Nm3/h、
CH4The clean pyrolysis gas of content 4%；By 350 DEG C caused by gas-based shaft kiln 4 of top gas after water scrubber 5 washs, 90% through pressure
900 DEG C, 12.9 ten thousand Nm are formed after contracting machine 6 pressurizes, desulfurization and decarburization processing unit 7 carries out desulfurization and decarburization, heating furnace 8 heats3/ h's
Purify top gas；The clean pyrolysis gas of generation and the purification top gas formed are mixed to form 900 DEG C of also Primordial Qi, and be passed into gas
The iron ore concentrate acid pellet of full iron 65% is reduced in base shaft furnace 4, so as to obtain being reduced directly iron product.Finally from gas-based shaft kiln 4
The products export 44 of bottom discharges 130 tons/h, full Iron grade 92%, the DRI of degree of metalization 95%.
Embodiment 4
As Figure 1-4,900 DEG C, 6.8 ten thousand Nm that pyrolysis oven 1 produces3/ h pyrolysis oil gas (is pyrolyzed tar, benzene in oil gas
And naphthalene equal size is 60g/Nm3, CH4Content 12%), through the dedusting of cyclone separator 2, by the dust Control being pyrolyzed in oil gas in 7g/
Nm3Behind left and right, being passed into 1100 DEG C of high temperature purification rooms 3, (length 4m, 8 oxygen jets 35 are circumferentially symmetrically distributed in high temperature
At the 0.5m of clean room front portion) in, in high temperature purification room 3 with 1.02 ten thousand Nm3/ h oxygen reaction generates about 9.52 ten thousand Nm3/h、
CH4The clean pyrolysis gas of content 2%；By 450 DEG C caused by gas-based shaft kiln 4 of top gas after water scrubber 5 washs, 80% through pressure
950 DEG C, 12.9 ten thousand Nm are formed after contracting machine 6 pressurizes, desulfurization and decarburization processing unit 7 carries out desulfurization and decarburization, heating furnace 8 heats3/ h's
Purify top gas；The clean pyrolysis gas of generation and the purification top gas formed are mixed to form 1000 DEG C of also Primordial Qi, and being passed into
The iron ore concentrate acid pellet of full iron 70% is reduced in gas-based shaft kiln 4, so as to obtain being reduced directly iron product.Finally from gas-based shaft kiln
The products export 44 of 4 bottoms discharges 125 tons/h, full Iron grade 90%, the DRI of degree of metalization 94%.
Embodiment 5
As Figure 1-4,850 DEG C, 7.4 ten thousand Nm that pyrolysis oven 1 produces3/ h pyrolysis oil gas (is pyrolyzed tar, benzene in oil gas
And naphthalene equal size is 50g/Nm3, CH4Content 8%), through the dedusting of cyclone separator 2, by the dust Control being pyrolyzed in oil gas in 6g/
Nm3Behind left and right, being passed into 1050 DEG C of high temperature purification rooms 3, (length 3m, 6 oxygen jets 35 are circumferentially symmetrically distributed in high temperature
At the 0.5m of clean room front portion) in, in high temperature purification room 3 with 7400Nm3/ h oxygen reaction generates about 8.14 ten thousand Nm3/h、CH4
The clean pyrolysis gas of content 3%；By 400 DEG C caused by gas-based shaft kiln 4 of top gas after water scrubber 5 washs, it is 80% compressed
900 DEG C, 13.2 ten thousand Nm are formed after machine 6 pressurizes, desulfurization and decarburization processing unit 7 carries out desulfurization and decarburization, heating furnace 8 heats3/ h's is net
Change top gas；The clean pyrolysis gas of generation and the purification top gas formed are mixed to form 1050 DEG C of also Primordial Qi, and be passed into gas
The iron ore concentrate acid pellet of reduced iron 67% in base shaft furnace 4, so as to obtain being reduced directly iron product.Finally from the bottom of gas-based shaft kiln 4
The products export 44 in portion discharges 120 tons/h, full Iron grade 94%, the DRI of degree of metalization 97%.
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)
- A kind of 1. system that DRI is smelted using clean pyrolysis gas, it is characterised in that including：Pyrolysis oven, the pyrolysis oven are used to produce pyrolysis oil gas, and the pyrolysis oven is provided with pyrolysis oil gas vent；Cyclone separator, the cyclone separator are provided with first entrance and first outlet, the first entrance and the pyrolysis Oil gas vent connects；High temperature purification room, the high temperature purification room are provided with second entrance, oxygen intake and second outlet, the second entrance with The first outlet connection；Gas-based shaft kiln, the gas-based shaft kiln are provided with also Primordial Qi entrance, iron ore entrance, top gas outlet and products export, institute Also Primordial Qi entrance is stated to connect with the second outlet.
- 2. the system according to claim 1 that DRI is smelted using clean pyrolysis gas, it is characterised in that also wrap Include：Water scrubber, the water scrubber are provided with the 3rd entrance and the 3rd outlet, and the 3rd entrance connects with top gas outlet It is logical；Compressor, the compressor are provided with the 4th entrance and the 4th outlet, the 4th entrance and the 3rd outlet；Desulfurization and decarburization processing unit, the desulfurization and decarburization processing unit are provided with the 5th entrance and the 5th outlet, and the described 5th enters Mouth and the 4th outlet；Heating furnace, the heating furnace are provided with the 6th entrance, fuel inlet and the 6th outlet, the 6th entrance and the described 5th Outlet, the 6th outlet are accessed between the second outlet and the also Primordial Qi entrance.
- 3. the system according to claim 2 that DRI is smelted using clean pyrolysis gas, it is characterised in that the combustion Expect entrance and the 3rd outlet.
- 4. the system according to claim 1 that DRI is smelted using clean pyrolysis gas, it is characterised in that the height Warm clean room's length is 2m-4m；The high temperature purification room includes clean room, oxygen endless tube and oxygen jet, the oxygen endless tube It is socketed on the periphery of the clean room, the oxygen endless tube has oxygen inlet, and the oxygen jet penetrates the clean room Tube wall and connect the oxygen endless tube, for the oxygen in oxygen endless tube to be sprayed onto in the high temperature purification room, the oxygen Nozzle is symmetrical arranged and quantity is 6-10.
- 5. the system according to claim 4 that DRI is smelted using clean pyrolysis gas, it is characterised in that described net Change and be respectively arranged with heat-insulation layer on the tube wall and the oxygen endless tube of room.
- 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 pyrolysis oil gas is utilized；2) the obtained pyrolysis oil gas in step 1) is passed through in cyclone separator and carries out dedusting；3) oxygen is passed through into high temperature purification room, the pyrolysis oil gas after dedusting in step 2) is passed through in high temperature purification room and oxygen Reacted, generate clean pyrolysis gas；4) clean pyrolysis gas 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 include：31) top gas of gas-based shaft kiln is passed through into water scrubber to be washed, subsequently into carrying out pressurized treatments in compressor；32) top gas after being handled in step 31) is passed through in desulfurization and decarburization processing unit and carries out desulfurization and decarburization；33) fuel is added into heating furnace, the top gas in step 32) is passed through in heating furnace and carries out being thermally formed purification furnace roof Gas；34) the purification top gas formed in the clean pyrolysis gas of generation in step 3) and step 33) is mixed to form also Primordial Qi, and It is passed into gas-based shaft kiln.
- 8. according to the method for claim 7, it is characterised in that in step 33), the fuel meat that is added into heating furnace Or the top gas of all gas-based shaft kilns after water scrubber is handled.
- 9. according to the method for claim 6, it is characterised in that the content of tar, benzene and naphthalene in the pyrolysis oil gas of step 1) For 20g/Nm3-100g/Nm3, C1-C3Paraffin gas volumn concentration is 4%-12%.
- 10. according to the method for claim 6, it is characterised in that the body of oxygen described in step 3) and the pyrolysis oil gas Product ratio is 0.03-0.15；And/or CH in the clean pyrolysis gas4Volume content be 2%-4%；And/or the clean heat It is 1.1-1.4 to vent one's spleen with the volume ratio of the pyrolysis oil gas.
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