CN106834586A - The system and method for preparing sponge iron - Google Patents
The system and method for preparing sponge iron Download PDFInfo
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- CN106834586A CN106834586A CN201710209637.5A CN201710209637A CN106834586A CN 106834586 A CN106834586 A CN 106834586A CN 201710209637 A CN201710209637 A CN 201710209637A CN 106834586 A CN106834586 A CN 106834586A
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- gas
- top gas
- entrance
- pyrolysis
- coal
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Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/006—Starting from ores containing non ferrous metallic oxides
-
- 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
Abstract
The invention discloses a kind of system and method for preparing sponge iron, the system includes：There is pyrolysis installation, the pyrolysis installation low-order coal entrance, pyrolysis oil gas vent and semicoke to export；There is gas-based shaft kiln, the gas-based shaft kiln iron ore entrance, also Primordial Qi entrance, top gas outlet and sponge iron to export, and the also Primordial Qi entrance is connected with the pyrolysis oil gas vent；There is gasification installation, the gasification installation semicoke entrance, low-order coal import, gasification agent inlet and coal gas to export, and the semicoke entrance is connected with semicoke outlet, and the coal gas outlet is connected with the pyrolysis installation.The system can make full use of cheap low-order coal to produce the also Primordial Qi of reducing iron ore, obtain the sponge iron that degree of metalization is not less than 90%, while the energy consumption of whole system can be significantly reduced, improve the economy of system.
Description
Technical field
The invention belongs to direct reduction processes of Iron ores field, specifically, the present invention relates to prepare sponge iron system and
Method.
Background technology
DRI (DRI), also known as sponge iron, is that iron ore is reduced directly the iron content for obtaining under less than 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 the cooling agent of high-quality, is to develop the indispensable raw material of Ferrous Metallurgy short route., whole world DRI in 2015
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 for producing 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 features such as energy consumption is low, pollution is small, product quality is stable.In current world wide, 76%
DRI be to be produced by gas base method, be mainly gas raw material processed to prepare the also Primordial Qi of high-quality with natural gas, reduce
The total content of carbon monoxide and hydrogen is more than 85% in gas.Current this kind of process industry process units be concentrated mainly on the Middle East,
The gas reserves such as South America are abundant, cheap area, and more rare for natural gas, expensive area, then without
Method uses the technology to carry out construction and produces to obtain good economic benefit.The energy natural endowment feature of China is that " rich coal is few
Gas oil starvation ", it is difficult to use gas renormalizing-gas-based shaft kiln directly reduced technique.
Therefore, the existing technology for preparing sponge iron is further improved.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, of the invention
One purpose is to propose a kind of system and method for preparing sponge iron.The system can make full use of cheap low-order coal to give birth to
The also Primordial Qi of reducing iron ore is produced, the sponge iron that degree of metalization is not less than 90% is obtained, while whole system can be significantly reduced
Energy consumption, improve system economy.
In one aspect of the invention, the present invention proposes a kind of system for preparing cavernous body, implementation of the invention
Example, the system includes：
There is pyrolysis installation, the pyrolysis installation low-order coal entrance, pyrolysis oil gas vent and semicoke to export；
There is gas-based shaft kiln, the gas-based shaft kiln iron ore entrance, also Primordial Qi entrance, top gas outlet and sponge iron to go out
Mouthful, the also Primordial Qi entrance is connected with the pyrolysis oil gas vent；
There is gasification installation, the gasification installation semicoke entrance, low-order coal import, gasification agent inlet and coal gas to export,
The semicoke entrance is connected with semicoke outlet, and the coal gas outlet is connected with the pyrolysis installation.
The system for preparing sponge iron according to embodiments of the present invention is supplied by the pyrolysis oil gas for producing low order pyrolysis of coal
Used as also Primordial Qi into gas-based shaft kiln, can substantially efficiently using the sensible heat for being pyrolyzed oil gas, so as to improve the energy of technique
Utilization rate, while the maintenance cost of system can be significantly reduced so that the energy consumption reduction 0.1-0.3Gcal/ of gas-based shaft kiln
DRI, and obtain the sponge iron that degree of metalization is not less than 90%；Compared with prior art, without using substantial amounts of day in the application
Right gas so that the rare area of natural gas can set up gas-based shaft kiln production line, produces the sponge iron of high-quality, leads in the application in addition
Cross and the char Gasification obtained by pyrolysis is produced into coal gas, the coal gas of gained can be supplied to pyrolysis installation be used as fuel, enter
One step improves the economy of whole system.
In addition, the system for preparing sponge iron according to the above embodiment of the present invention can also have following additional technology special
Levy：
In some embodiments of the invention, the above-mentioned system for preparing sponge iron is further included：Top gas clean unit,
There is the top gas clean unit top gas entrance, pyrolysis oil export, fuel outlet and purification top gas to export, the furnace roof
Gas entrance is connected with top gas outlet, and the fuel outlet is connected with the pyrolysis installation；Heater, the heating dress
Put with fuel inlet, purification top gas entrance and preheating after-purification top gas outlet, the fuel inlet respectively with the combustion
Material outlet is connected with coal gas outlet, and the purification top gas entrance is connected with the purification top gas outlet, described pre-
Hot after-purification top gas outlet is connected with the also Primordial Qi entrance.Thus, be conducive to improving the quality of sponge iron, while one can be entered
Step reduces the energy consumption of whole system, improves the economy of whole system.
In some embodiments of the invention, the top gas clean unit include be sequentially connected washing purifying device,
Pressue device and desulfurization and decarburization tower.Thus, can further improve the quality of cavernous body.
In another invention of the invention, the present invention proposes a kind of using the above-mentioned system preparation sponge for preparing sponge iron
The method of iron, embodiments in accordance with the present invention, the method includes：
(1) supplying low-order coal carries out pyrolysis processing into the pyrolysis installation, to obtain being pyrolyzed oil gas and semicoke；
(2) the pyrolysis oil gas and iron ore are supplied and reduction treatment is carried out into the gas-based shaft kiln, to obtain stove
Top gas and sponge iron；
(3) supplying low-order coal and the semicoke, gasifying agent carries out gasification process into the gasification installation, to obtain
Coal gas, and will be used as fuel in part supply to the pyrolysis installation of the coal gas.
The method for preparing sponge iron according to embodiments of the present invention supplies to gas the pyrolysis oil gas that low order pyrolysis of coal is produced
Used as also Primordial Qi in base shaft furnace, can substantially efficiently using the sensible heat for being pyrolyzed oil gas, so as to improve the using energy source of technique
Rate, while the maintenance cost of system can be significantly reduced so that the energy consumption reduction 0.1-0.3Gcal/DRI of gas-based shaft kiln, and
Obtain the sponge iron that degree of metalization is not less than 90%；Compared with prior art, make without using substantial amounts of natural gas in the application
The rare area of natural gas can set up gas-based shaft kiln production line, the sponge iron of high-quality is produced, in addition by by heat in the application
Char Gasification production coal gas obtained by solution, the coal gas of gained can be supplied to pyrolysis installation be used as fuel, further carry
The economy of whole system high.
In addition, the method for preparing sponge iron according to the above embodiment of the present invention can also have following additional technology special
Levy：
In some embodiments of the invention, the above-mentioned method for preparing sponge iron is further included：(4) by the top gas
Purified treatment is carried out in supply to the top gas clean unit, to obtain pyrolysis oil, fuel and purification top gas；(5) will
The coal gas, the fuel and the purification top gas are supplied into the heater to enter to the purification top gas
Row heating, obtain preheat after-purification top gas, and using it is described preheating after-purification top gas supply into the gas-based shaft kiln as
Also Primordial Qi is used.Thus, be conducive to improving the quality of sponge iron, while the energy consumption of whole system can be reduced further, improve whole
The economy of individual system.
In some embodiments of the invention, in step (3), the mixing quality ratio of the semicoke and the low-order coal
It is (0.7-0.9)：(0.1-0.3).Thus, calorific value coal gas higher is can obtain, and then further improves the economy of the method
Property.
In some embodiments of the invention, in step (4), the purified treatment successively include washing, purifying treatment,
Pressurized treatments and desulfurization and decarburization are processed.Thus, can further improve the quality of cavernous body.
Additional aspect of the invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by practice of the invention.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from description of the accompanying drawings below to embodiment is combined
Substantially and be readily appreciated that, wherein：
Fig. 1 is the system structure diagram for preparing sponge iron according to an embodiment of the invention；
Fig. 2 is the system structure diagram for preparing sponge iron according to further embodiment of the present invention；
Fig. 3 is the method flow schematic diagram for preparing sponge iron according to an embodiment of the invention；
Fig. 4 is the method flow schematic diagram for preparing sponge iron according to further embodiment of the present invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
It is exemplary to scheme the embodiment of description, it is intended to for explaining the present invention, and be not considered as limiting the invention.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integrally；Can be that machinery connects
Connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion or two interaction relationships of element, unless otherwise clearly restriction.For one of ordinary skill in the art
For, can as the case may be understand above-mentioned term concrete meaning in the present invention.
In one aspect of the invention, the present invention proposes a kind of system for preparing cavernous body, implementation of the invention
Example, with reference to Fig. 1, the system includes：Pyrolysis installation 100, gas-based shaft kiln 200 and gasification installation 300.
Embodiments in accordance with the present invention, pyrolysis installation 100 has low-order coal entrance 101, pyrolysis oil gas vent 102 and semicoke
Outlet 103, and be suitable to for low-order coal to carry out pyrolysis processing, to obtain being pyrolyzed oil gas and semicoke.Specifically, will be cheap
And low-order coal of the particle diameter less than 3mm is supplied into pyrolysis installation from the top of pyrolysis installation, is pyrolyzed, temperature is obtained for 700-
900 degrees Celsius of pyrolysis oil gas and semicoke, the pyrolysis oil gas of gained is discharged from the middle and lower part of pyrolysis installation.It should be noted that
The particular type of low-order coal is not particularly restricted, and those skilled in the art can be selected according to actual needs, for example may be used
Think at least one of jet coal, lignite.Pyrolysis installation is also not particularly limited, and those skilled in the art can be according to reality
Border needs to be selected, for example, can be pyrolysis oven, preferably regenerator radiant tube pyrolysis oven.Inventor has found, by using low
Rank coal production pyrolysis oil gas is used as the also Primordial Qi of reducing iron ore, can significantly reduce the production cost of sponge iron, and with
Prior art is compared, and without using substantial amounts of natural gas in the application, may be such that the rare area of natural gas can set up gas base and erect
Stove production line, produces the sponge iron of high-quality, while the cost of technique can be significantly reduced.
Embodiments in accordance with the present invention, gas-based shaft kiln 200 has iron ore entrance 201, also Primordial Qi entrance 202, top gas
Outlet 203 and sponge iron outlet 204, also Primordial Qi entrance 202 with pyrolysis oil gas vent 102 be connected, and be suitable to will be pyrolyzed oil gas with
Iron ore carries out reduction treatment, to obtain top gas and sponge iron.Specifically, pyrolysis installation gained is pyrolyzed into oil gas from gas base
The middle part of shaft furnace is sent into as reduction pneumatic transmission to gas-based shaft kiln, iron ore from the top of gas-based shaft kiln, and also Primordial Qi connects with iron ore
Touch, the reducing gas in pyrolysis oil gas occurs reduction reaction with iron ore, and pyrolysis oil therein volatilization is discharged from shaft furnace top,
Obtain the sponge iron of top gas and degree of metalization not less than 90% that temperature is 350-400 degrees Celsius.It should be noted that iron ore
The particular type of stone is not particularly restricted, and those skilled in the art can be selected according to actual needs, for example, can be
Schreyerite acid pellet, iron ore concentrate acid pellet.Inventor has found that the pyrolysis oil gas obtained by pyrolysis installation is without through rinse dehydration
Cooling, without using a large amount of expensive reforming catalysts, and the sulfur content of pair also Primordial Qi to be limited without strict, can directly be sent
To gas-based shaft kiln as also Primordial Qi reducing iron ore, the sensible heat for being pyrolyzed oil gas, the energy for improving technique can be substantially efficiently utilized
Utilization rate, while the maintenance cost of system can be significantly reduced so that the energy consumption reduction 0.1-0.3Gcal/ of gas-based shaft kiln
DRI, and obtain the sponge iron that degree of metalization is not less than 90%.
There is embodiments in accordance with the present invention, gasification installation 300 semicoke entrance 301, low-order coal import 302, gasifying agent to enter
Mouth 303 and coal gas outlet 304, semicoke entrance 301 are connected with semicoke outlet 103, and coal gas exports 304 with pyrolysis installation 100
It is connected, and is suitable to for low-order coal and semicoke, gasifying agent to carry out gasification process, to obtain coal gas, and the coal gas that will be obtained
Part supply to being used as fuel in the regenerator radiant tube in pyrolysis installation.Specifically, obtained by pyrolysis installation half
Jiao is mixed by a certain percentage with low-order coal, and in producing coal gas, and gained in gasification installation in the presence of gasifying agent
Coal gas can be supplied to above-mentioned pyrolysis installation be used as fuel, thus, the energy consumption of whole system can be significantly reduced, meanwhile,
Can reach the effect for making full use of low-order coal.
According to one embodiment of present invention, semicoke is not particularly restricted with the mixing quality ratio of low-order coal, this area
Technical staff can be selected according to actual needs, a specific embodiment of the invention, and semicoke is mixed with low-order coal
It can be (0.7-0.9) to close mass ratio：(0.1-0.3).Inventor has found, if semicoke compared with the mixing quality of low-order coal
Height, is easily caused gasification efficiency reduction, increases energy consumption；And if the mixing quality of semicoke and low-order coal is than too low, semicoke is had more than needed, nothing
Method is fully used.Thus, gasification effect is remarkably improved using the mixing quality ratio of semicoke proposed by the present invention and low-order coal
Rate, while realizing making full use of for semicoke, increases the economy of whole technique.
The system for preparing sponge iron according to embodiments of the present invention is supplied by the pyrolysis oil gas for producing low order pyrolysis of coal
Used as also Primordial Qi into gas-based shaft kiln, can substantially efficiently using the sensible heat for being pyrolyzed oil gas, so as to improve the energy of technique
Utilization rate, while the maintenance cost of system can be significantly reduced so that the energy consumption reduction 0.1-0.3Gcal/ of gas-based shaft kiln
DRI, and obtain the sponge iron that degree of metalization is not less than 90%；Compared with prior art, without using substantial amounts of day in the application
Right gas so that the rare area of natural gas can set up gas-based shaft kiln production line, produces the sponge iron of high-quality, leads in the application in addition
Cross and the char Gasification obtained by pyrolysis is produced into coal gas, the coal gas of gained can be supplied to pyrolysis installation be used as fuel, enter
One step improves the economy of whole system.
Embodiments in accordance with the present invention, with reference to Fig. 2, the above-mentioned system for preparing sponge iron is further included：Top gas is purified
Unit 400 and heater 500.
Embodiments in accordance with the present invention, top gas clean unit 400 have top gas entrance 401, pyrolysis oil export 402,
Fuel outlet 403 and purification top gas outlet 404, top gas entrance 401 and top gas outlet 203 is connected, fuel outlet 403 and
Pyrolysis installation 100 is connected, and is suitable to for top gas to carry out purified treatment, to obtain pyrolysis oil, fuel and purification top gas.Tool
Body, top gas is supplied to top gas clean unit carries out purified treatment, and a part for the fuel for obtaining is supplied to above-mentioned heat
Solution device is used as fuel, and the purification top gas of gained can be used as the also Primordial Qi of gas-based shaft kiln.Inventor has found, leads to
Cross carries out purified treatment by top gas, can make full use of the value of top gas, thus, can further reduce the energy of whole system
Consumption, improves the economy of whole technique.
According to one embodiment of present invention, top gas clean unit can include be sequentially connected washing purifying device,
Pressue device and desulfurization and decarburization tower.Specifically, top gas first scrubbed purifier carries out washing, purifying, isolate pyrolysis oil and
Washing, purifying top gas, then small part washing, purifying top gas is supplied to pyrolysis installation used as fuel as fuel,
The remaining pressurized device pressurization of major part washing, purifying top gas, being then sent to desulfurization and decarburization tower carries out desulfurization and decarburization treatment, obtains
To purification top gas.Thus, can further improve the reproducibility of purification top gas.It should be noted that those skilled in the art
Concrete operations condition that can be according to actual needs to washing, purifying, pressurization and desulfurization and decarburization process is selected.
Embodiments in accordance with the present invention, heater 500 has fuel inlet 501, purification top gas entrance 502 and preheating
After-purification top gas outlet 503, fuel inlet 501 is connected with fuel outlet 403 and coal gas outlet 304 respectively, purifies furnace roof
Gas entrance 502 is connected with purification top gas outlet 404, and preheating after-purification top gas outlet 503 is connected with also Primordial Qi entrance 202,
And it is that thermal source is heated to purification top gas to be suitable to another part coal gas and another part fuel, obtains preheating after-purification
Top gas, and will preheating after-purification top gas supply into gas-based shaft kiln as and also Primordial Qi use.Inventor has found, because of top gas
From gas-based shaft kiln discharge when temperature just only 350-400 degrees Celsius, by after purified treatment temperature become it is lower, in order to drop
The energy consumption of low gas-based shaft kiln, therefore purification top gas is heated before purification top gas delivers to gas-based shaft kiln.Heating
A fuel part needed for stove is a part of from the fuel obtained by top gas clean unit from the coal gas obtained by gasification furnace,
And the fuel that the coal gas that obtains of gasification furnace and top gas clean unit are obtained can be mixed to get calorific value not less than 1300kcal/
Nm3Fuel, thus, further increase the economy of whole technique.
As described above, the system for preparing sponge iron according to embodiments of the present invention can have the advantages that selected from it is following at least it
One：
The system for preparing sponge iron according to embodiments of the present invention, 700-900 degrees Celsius of pyrolysis installation production of high temperature
The sensible heat for being pyrolyzed oil gas is fully used, and the energy utilization efficiency of whole system is high, and gas-based shaft kiln generates the reduction that can consume energy
0.1-0.3Gcal/DRI, while whole system is without building the devices, reduces cost such as complicated wash cooling purification, desulfurization；
The system for preparing sponge iron according to embodiments of the present invention, pyrolysis oil gas can only need to after simple heating direct heat
Gas-based shaft kiln is delivered to, without using a large amount of expensive reforming catalysts, system is simplified, and maintenance cost is low；
The system for preparing sponge iron according to embodiments of the present invention, without using substantial amounts of natural gas, and uses price low
Honest and clean low-order coal does raw material production also Primordial Qi so that it is direct to produce high-quality that gas-based shaft kiln production line is built in natural gas scarce areas
Reduced iron is possibly realized, and product cost is significantly reduced；
In another aspect of the invention, the present invention proposes a kind of using the above-mentioned system preparation sponge for preparing sponge iron
The method of iron, embodiments in accordance with the present invention, with reference to Fig. 3, the method includes：
S100：Low-order coal is supplied into pyrolysis installation carries out pyrolysis processing
In the step, low-order coal is supplied into pyrolysis installation carries out pyrolysis processing, to obtain being pyrolyzed oil gas and semicoke.
Specifically, the low-order coal by cheap and particle diameter less than 3mm is supplied into pyrolysis installation from the top of pyrolysis installation, carry out
Pyrolysis, obtains pyrolysis oil gas and semicoke that temperature is 700-900 degrees Celsius, the middle and lower part of the pyrolysis oil gas from pyrolysis installation of gained
Discharge.It should be noted that the particular type of low-order coal is not particularly restricted, those skilled in the art can be according to actual need
Selected, for example, can be at least one of jet coal, lignite.Pyrolysis installation is also not particularly limited, this area
Technical staff can be selected according to actual needs, for example, can be pyrolysis oven, preferably regenerator radiant tube pyrolysis oven.Invention
People's discovery, the also Primordial Qi that pyrolysis oil gas is used as reducing iron ore is produced by using low-order coal, can significantly reduce sponge iron
Production cost, and compared with prior art, without using substantial amounts of natural gas in the application, may be such that natural gas is rare
Area can set up gas-based shaft kiln production line, the sponge iron of high-quality be produced, while the cost of technique can be significantly reduced.
S200：Pyrolysis oil gas and iron ore are supplied into gas-based shaft kiln and carries out reduction treatment
In the step, pyrolysis oil gas and iron ore are supplied into gas-based shaft kiln and carries out reduction treatment, to obtain furnace roof
Gas and sponge iron.Specifically, pyrolysis installation gained pyrolysis oil gas is erected from the middle part of gas-based shaft kiln as reduction pneumatic transmission to gas base
Stove, iron ore is sent into from the top of gas-based shaft kiln, and also Primordial Qi is contacted with iron ore, reducing gas and iron ore in pyrolysis oil gas
Generation reduction reaction, and pyrolysis oil therein volatilization is discharged from shaft furnace top, obtains the top gas that temperature is 350-400 degrees Celsius
Sponge iron with degree of metalization not less than 90%.It should be noted that the particular type of iron ore is not particularly restricted, ability
Field technique personnel can be selected according to actual needs, for example, can be schreyerite acid pellet, iron ore concentrate acid pellet.Hair
A person of good sense has found that the pyrolysis oil gas obtained by pyrolysis installation is urged without being cooled down through rinse dehydration without using a large amount of expensive reformations
Agent, and pair also the sulfur content of Primordial Qi, without strict limitation, can directly be passed to gas-based shaft kiln as also Primordial Qi reducing iron ore,
The sensible heat for being pyrolyzed oil gas, the energy utilization rate for improving technique can be substantially efficiently utilized, while the maintenance of system can be significantly reduced
Cost so that the energy consumption reduction 0.1-0.3Gcal/DRI of gas-based shaft kiln, and obtain the sponge that degree of metalization is not less than 90%
Iron.
S300：Low-order coal and semicoke, gasifying agent are supplied into gasification installation carries out gasification process
In the step, low-order coal and semicoke, gasifying agent are supplied into gasification installation carries out gasification process, to obtain coal
Gas processed, and will be used as fuel in part supply to the regenerator radiant tube in the pyrolysis installation of gained coal gas.
Specifically, the semicoke obtained by pyrolysis installation is mixed by a certain percentage with low-order coal, and in gasification in the presence of gasifying agent
Coal gas is produced in device, and the coal gas of gained can be supplied to above-mentioned pyrolysis installation be used as fuel, thus, can significantly drop
The energy consumption of low whole system, meanwhile, can reach the effect for making full use of low-order coal.
According to one embodiment of present invention, semicoke is not particularly restricted with the mixing quality ratio of low-order coal, this area
Technical staff can be selected according to actual needs, a specific embodiment of the invention, and semicoke is mixed with low-order coal
It can be (0.7-0.9) to close mass ratio：(0.1-0.3).Inventor has found, if semicoke compared with the mixing quality of low-order coal
Height, is easily caused gasification efficiency reduction, increases energy consumption；And if the mixing quality of semicoke and low-order coal is than too low, semicoke is had more than needed, nothing
Method is fully used.Thus, gasification effect is remarkably improved using the mixing quality ratio of semicoke proposed by the present invention and low-order coal
Rate, while realizing making full use of for semicoke, increases the economy of whole technique.
The method for preparing sponge iron according to embodiments of the present invention is supplied by the pyrolysis oil gas for producing low order pyrolysis of coal
Used as also Primordial Qi into gas-based shaft kiln, can substantially efficiently using the sensible heat for being pyrolyzed oil gas, so as to improve the energy of technique
Utilization rate, while the maintenance cost of system can be significantly reduced so that the energy consumption reduction 0.1-0.3Gcal/ of gas-based shaft kiln
DRI, and obtain the sponge iron that degree of metalization is not less than 90%；Compared with prior art, without using substantial amounts of day in the application
Right gas so that the rare area of natural gas can set up gas-based shaft kiln production line, produces the sponge iron of high-quality, leads in the application in addition
Cross and the char Gasification obtained by pyrolysis is produced into coal gas, the coal gas of gained can be supplied to pyrolysis installation be used as fuel, enter
One step improves the economy of whole system.
Embodiments in accordance with the present invention, with reference to Fig. 4, the above-mentioned method for preparing sponge iron is further included：
S400：Top gas is supplied carries out purified treatment into top gas clean unit
In the step, top gas is supplied carries out purified treatment into top gas clean unit, to obtain pyrolysis oil, combustion
Material and purification top gas.Specifically, top gas is supplied to top gas clean unit purified treatment is carried out, the one of the fuel for obtaining
Part can be supplied to above-mentioned pyrolysis installation be used as fuel, and the purification top gas of gained can be used as the also Primordial Qi of gas-based shaft kiln
Use.Inventor's discovery, purified treatment is carried out by by top gas, can make full use of the value of top gas, thus, can be further
The energy consumption of whole system is reduced, the economy of whole technique is improved.
According to one embodiment of present invention, top gas purified treatment can include be sequentially connected washing, purifying treatment,
Pressurized treatments and desulfurization and decarburization are processed.Specifically, top gas first scrubbed purifier carries out washing, purifying, isolate pyrolysis oil
With washing, purifying top gas, then small part washing, purifying top gas is supplied to pyrolysis installation as fuel makes as fuel
With, the remaining pressurized device pressurization of major part washing, purifying top gas, being then sent to desulfurization and decarburization tower carries out desulfurization and decarburization treatment,
It is purified top gas.Thus, can further improve the reproducibility of purification top gas.It should be noted that people in the art
Member can be selected washing, purifying, pressurization and the concrete operations condition of desulfurization and decarburization process according to actual needs.
S500：Another part coal gas, another part fuel and purification top gas are supplied into heater so as to right
Purification top gas is heated
In the step, by another part coal gas, another part fuel and purification top gas supply into heater with
Just purification top gas is heated, obtains preheating after-purification top gas, and preheating after-purification top gas is supplied to gas base and erected
Used as also Primordial Qi in stove.Inventor has found that the temperature when being discharged from gas-based shaft kiln because of top gas just only has 350-400 to take the photograph
Family name's degree, by temperature after purified treatment become it is lower, in order to reduce the energy consumption of gas-based shaft kiln, therefore gas base is delivered in purification top gas
Purification top gas is heated before shaft furnace.A fuel part needed for heating furnace is from the coal system obtained by gasification furnace
Gas, a part is from the fuel obtained by top gas clean unit, and the coal gas that obtains of gasification furnace and top gas clean unit are obtained
To fuel can be mixed to get calorific value not less than 1300kcal/Nm3Fuel, thus, further increase the warp of whole technique
Ji property.
Below with reference to specific embodiment, present invention is described, it is necessary to explanation, these embodiments are only description
Property, and the present invention is limited never in any form.
Embodiment 1
Jet coal of the granularity less than 3mm is put into from pyrolysis oven top, is pyrolyzed at a temperature of 950 degrees Celsius, generation heat
Solution oil gas and semicoke, about 870 degrees Celsius of pyrolysis oil gas is discharged from pyrolysis oven middle and lower part, and from gas-based shaft kiln middle part feeding with from
There is reduction reaction in the iron ore concentrate acid pellet of the full iron 67wt% of top feeding, form about 380 degrees Celsius of top gas from gas
Ji Shululuding discharges out of the furnace, while obtaining the sponge iron that degree of metalization is 91%.The scrubbed purifier of top gas is removed
Dirt dewater treatment, reclaims pyrolysis oil, and using 10vt% washing, purifying top gases as periodic off-gases, remaining 90vt% is pressurized, de-
The preheating after-purification top gas of about 920 degrees Celsius of temperature is generated after sulphur decarburization, heating stove heat etc. reason, and by after above-mentioned preheating
Purification top gas is supplied into gas-based shaft kiln as the also Primordial Qi of gas-based shaft kiln.Semicoke and a certain proportion of length that pyrolysis oven is produced
Flame coal mixes, and the two ratio is 0.7：0.3, put into air as gasifying agent gasification furnace production coal gas, then with washing, purifying
Top gas is mixed into calorific value about 1300kcal/Nm3Gaseous mixture, as the fuel of pyrolysis oven in system and heating furnace.
Embodiment 2
Lignite of the granularity less than 3mm is put into from pyrolysis oven top, is pyrolyzed at a temperature of 880 degrees Celsius, generation pyrolysis
Oil gas and semicoke, about 850 degrees Celsius of pyrolysis oil gas is discharged from pyrolysis oven middle and lower part, and from gas-based shaft kiln middle part feeding with from top
There is reduction reaction in the schreyerite acid pellet of the full iron 58wt% of portion's feeding, form about 380 degrees Celsius of top gas from gas base
Vertical furnace top discharges out of the furnace, while obtaining the sponge iron that degree of metalization is 90%.The scrubbed purifier of top gas carries out dedusting
Dewater treatment, reclaims pyrolysis oil, and using 15vt% washing, purifying top gases as periodic off-gases, remaining 85vt% is pressurized, desulfurization
The preheating after-purification top gas of about 950 degrees Celsius of temperature is generated after decarburization, heating stove heat etc. reason, and will be net after above-mentioned preheating
Change top gas to be supplied into gas-based shaft kiln as the also Primordial Qi of gas-based shaft kiln.Semicoke and a certain proportion of long flame that pyrolysis oven is produced
Coal mixes, and the two ratio is 0.9：0.1, put into air as gasifying agent gasification furnace production coal gas, then with washing, purifying stove
Top gas is mixed into calorific value about 1350kcal/Nm3Gaseous mixture, as the fuel of pyrolysis oven in system and heating furnace.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be with office
Combined in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
Art personnel can be tied the feature of the different embodiments or example described in this specification and different embodiments or example
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (7)
1. a kind of system for preparing sponge iron, it is characterised in that including：
There is pyrolysis installation, the pyrolysis installation low-order coal entrance, pyrolysis oil gas vent and semicoke to export；
There is gas-based shaft kiln, the gas-based shaft kiln iron ore entrance, also Primordial Qi entrance, top gas outlet and sponge iron to export, institute
Also Primordial Qi entrance is stated to be connected with the pyrolysis oil gas vent；
There is gasification installation, the gasification installation semicoke entrance, low-order coal import, gasification agent inlet and coal gas to export, described
Semicoke entrance is connected with semicoke outlet, and the coal gas outlet is connected with the pyrolysis installation.
2. system according to claim 1, it is characterised in that further include：
Top gas clean unit, the top gas clean unit has top gas entrance, pyrolysis oil export, fuel outlet and purification
Top gas is exported, and the top gas entrance is connected with top gas outlet, and the fuel outlet is connected with the pyrolysis installation；
There is heater, the heater fuel inlet, purification top gas entrance and preheating after-purification top gas to export, institute
State fuel inlet to be connected with the fuel outlet and coal gas outlet respectively, purification top gas entrance and the purification
Top gas outlet is connected, and preheating after-purification top gas outlet is connected with the also Primordial Qi entrance.
3. system according to claim 2, washing purifying device that the top gas clean unit includes being sequentially connected, plus
Pressure device and desulfurization and decarburization tower.
4. a kind of method that system according to any one of claim 1-3 prepares sponge iron, it is characterised in that including：
(1) supplying low-order coal carries out pyrolysis processing into the pyrolysis installation, to obtain being pyrolyzed oil gas and semicoke；
(2) the pyrolysis oil gas and iron ore are supplied and reduction treatment is carried out into the gas-based shaft kiln, to obtain top gas
And sponge iron；
(3) supplying low-order coal and the semicoke, gasifying agent carries out gasification process into the gasification installation, to obtain coal system
Gas, and will be used as fuel in part supply to the pyrolysis installation in step (1) of the coal gas.
5. method according to claim 4, it is characterised in that further include：
(4) supply the top gas carries out purified treatment into the top gas clean unit, to obtain pyrolysis oil, fuel
With purification top gas, and will the fuel part supply to being used as fuel in the pyrolysis installation in step (1)；
(5) another part of the coal gas, another part of the fuel and the purification top gas are supplied to described and is added
To heat the purification top gas in thermal, obtain preheating after-purification top gas, and by the preheating after-purification
Top gas is supplied into the gas-based shaft kiln and used as also Primordial Qi.
6. the method according to claim 4 or 5, in step (3), the mixing quality ratio of the semicoke and the low-order coal
Example is (0.7-0.9)：(0.1-0.3).
7. method according to claim 5, it is characterised in that in step (4), the purified treatment includes washing successively
The treatment of purified treatment, pressurized treatments and desulfurization and decarburization.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3853538A (en) * | 1973-07-20 | 1974-12-10 | Steel Corp | Use of reducing gas by coal gasification for direct iron ore reduction |
| CN105670699A (en) * | 2016-03-23 | 2016-06-15 | 北京神雾环境能源科技集团股份有限公司 | System and method for treating low-rank coal |
| CN105885953A (en) * | 2016-06-12 | 2016-08-24 | 北京京诚泽宇能源环保工程技术有限公司 | Device and method for preparing reducing gas through lignite gasification poly-generation |
| CN206721247U (en) * | 2017-03-31 | 2017-12-08 | 江苏省冶金设计院有限公司 | The system for preparing sponge iron |
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2017
- 2017-03-31 CN CN201710209637.5A patent/CN106834586A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3853538A (en) * | 1973-07-20 | 1974-12-10 | Steel Corp | Use of reducing gas by coal gasification for direct iron ore reduction |
| CN105670699A (en) * | 2016-03-23 | 2016-06-15 | 北京神雾环境能源科技集团股份有限公司 | System and method for treating low-rank coal |
| CN105885953A (en) * | 2016-06-12 | 2016-08-24 | 北京京诚泽宇能源环保工程技术有限公司 | Device and method for preparing reducing gas through lignite gasification poly-generation |
| CN206721247U (en) * | 2017-03-31 | 2017-12-08 | 江苏省冶金设计院有限公司 | The system for preparing sponge iron |
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