CN106755693A - Hot charging gas-based shaft kiln system and method - Google Patents
Hot charging gas-based shaft kiln system and method Download PDFInfo
- Publication number
- CN106755693A CN106755693A CN201710137054.6A CN201710137054A CN106755693A CN 106755693 A CN106755693 A CN 106755693A CN 201710137054 A CN201710137054 A CN 201710137054A CN 106755693 A CN106755693 A CN 106755693A
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- gas
- hot tank
- shaft kiln
- based shaft
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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
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
Abstract
The present invention relates to a kind of hot charging gas-based shaft kiln system and method.The system includes heat transfer apparatus, hot tank and gas-based shaft kiln；The heat transfer apparatus are used to convey thermal oxide pelletizing；For the storage to the thermal oxide pelletizing and the hot tank of insulation there is hot tank entrance to be exported with hot tank, the hot tank entrance is connected with the heat transfer apparatus；The gas-based shaft kiln is divided into reducing zone and cooling cemented zone from top to bottom, and the reducing zone bottom is provided with also Primordial Qi air inlet endless tube, and the also Primordial Qi air inlet endless tube has multiple puff prots, and the reducing zone of the gas-based shaft kiln is connected with hot tank outlet.Gas-based shaft kiln of the present invention does not need preheating zone, improves the utilization rate of shaft furnace.Hot thermal oxide pelletizing directly can be transported to gas-based shaft kiln and be used as raw material by the other present invention, without first lowering the temperature, reheating operation, so as to significantly save system energy consumption.
Description
Technical field
The present invention relates to metal smelt field, more particularly to direct reduction processes of Iron ores field, more particularly to a kind of heat
Dress gas-based shaft kiln 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 75,220,000 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.In current world wide, 78% DRI is produced by gas base method, and gas base method mainly includes
MIDREX techniques, HYL techniques and PERED techniques.Gas-based shaft kiln directly reduced iron-refining process is universally acknowledged green low-carbon ironmaking
Technique.With what is signed in Paris weather summit in 2015《Paris agreement》Implement, gas-based shaft kiln directly reduced ironmaking technology will
Obtain wider popularization and application.Iron ore material handled by gas-based shaft kiln is mainly acid pellet, prepared by acid pellet
Journey experienced the temperature change of " room temperature -1200-1350 DEG C-less than 100 DEG C of finished product ", and acid pellet is put into gas base and erected
During stove, temperature also needs to be enhanced 800-900 DEG C and can just be reduced gas and be reduced into direct-reduction iron product.During cooling, again
Temperature-rise period energy consumption wastes big.
The iron ore material that routine gas-based shaft kiln technique is used at present is mainly normal temperature (less than 100 DEG C) acid pellet, oxygen
Gradually 800-900 DEG C is heated to after pellet input shaft furnace from normal temperature by top gas/also Primordial Qi.Conventional acid pellet production work
Skill is chain grate-rotary kiln-central cooler method, can be divided into drying, preheating, roasting and refrigerating work procedure, wherein calcining process temperature
Up to 1200-1350 DEG C, then it is cooled and is cooled to less than 100 DEG C, shaft furnace is then transported to again as raw material.
The shortcoming of normal temperature oxidation pelletizing production-gas-based shaft kiln reducing process is：1100-1300 DEG C of acid pellet elder generation
Through being cooled to less than 100 DEG C, then 800-900 DEG C is heated in gas-based shaft kiln can just be reduced into product, so, first drop
Temperature, the technique for heating up again cause 1000-2000 DEG C of heat waste, dramatically increase the energy consumption of technique.Additionally, acid pellet is produced
System has included the central cooler of cooling effect, increased equipment, extends operation.Finally, conventional gas-based shaft kiln also Primordial Qi is entered
More than gas port it is made up of with preheating zone reducing zone, the presence of preheating zone both makes to significantly improve the height of shaft furnace, reduces again perpendicular
The utilization rate of stove.
The content of the invention
To overcome above mentioned problem, the present invention to provide the hot charging gas-based shaft kiln system that a kind of gas-based shaft kiln by without preheating area is constituted
System and method.
Hot charging gas-based shaft kiln system of the present invention includes heat transfer apparatus, hot tank and gas-based shaft kiln；Wherein,
The heat transfer apparatus are used to convey thermal oxide pelletizing；
The hot tank has hot tank entrance with hot tank outlet, the hot tank entrance and the heat transfer apparatus phase
Even, the hot tank is used for storage and insulation to the thermal oxide pelletizing；
The gas-based shaft kiln is divided into reducing zone and cooling cemented zone from top to bottom, and the reducing zone bottom is provided with also Primordial Qi
Air inlet endless tube, the also Primordial Qi air inlet endless tube has multiple puff prots, and the reducing zone of the gas-based shaft kiln goes out with the hot tank
Mouth is connected.
Further, the system also includes the feed arrangement being arranged between the hot tank and the gas-based shaft kiln.
Further, the system also includes thermal oxidation units, and the thermal oxidation units include chain bamboo trunk machine and rotary kiln, use
In the thermal oxide pelletizing is prepared, green pellets passes sequentially through the chain bamboo trunk machine and rotary kiln.
Further, the system also includes pelletizing room, and the pelletizing room is connected with the thermal oxidation units, for inciting somebody to action
Raw material is made green pellets, and passes to the thermal oxidation units.
The present invention also provides a kind of method of utilization said system reduced iron, the described method comprises the following steps：
Thermal oxide pelletizing is delivered to hot tank by heat transfer apparatus, the hot tank is carried out to the thermal oxide pelletizing
Storage, insulation；
Thermal oxide pelletizing in the hot tank is delivered to the reducing zone of the gas-based shaft kiln, from the also Primordial Qi air inlet ring
Pipe is passed through also Primordial Qi, and the also Primordial Qi is sprayed by each puff prot and such as enters the gas-based shaft kiln, also Primordial Qi and the heat
Acid pellet is inversely contacted, and carries out reduction reaction, obtains reduced iron and hot-top gas；
The reduced iron obtains iron through the cooling of supercooling cemented zone, carburizing, and the hot-top gas is from the hot-top gas
Outlet discharge.
Further, methods described is further comprising the steps of：
The thermal oxide pelletizing is delivered to by the gas-based shaft kiln from the hot tank by feed arrangement.
Further, methods described is further comprising the steps of：
Green pellets is dried by chain bamboo trunk machine, is preheated, be sent to rotary kiln, the rotary kiln carries out oxidizing roasting to it,
Prepare thermal oxide pelletizing.
Further, methods described is further comprising the steps of：
By raw material feeding pelletizing room, the green pellets is prepared.
Specifically, the temperature into the thermal oxide pelletizing of the gas-based shaft kiln is 800 DEG C -1100 DEG C.
Specifically, the temperature of the thermal reduction gas is 850 DEG C -1050 DEG C.
Beneficial effects of the present invention：
Gas-based shaft kiln of the present invention is provided only with reducing zone and cooling cemented zone, it is not necessary to preheating zone so that gas base
The height of shaft furnace is reduced, and also improves the utilization rate of gas-based shaft kiln.The temperature of the acid pellet of other rotary kiln production exists
1100-1300 DEG C, directly the hot gas-based shaft kiln that is transported to can be used as raw material, without first lowering the temperature, reheating operation, so that aobvious
Work has saved system energy consumption.Also above-mentioned reason is based on, in the production process of acid pellet, system need not play cooling and make
Central cooler so that oxide pelletizing process is simplified.
Brief description of the drawings
Fig. 1 is the schematic diagram of hot charging gas-based shaft kiln system of the present invention.
Fig. 2 is the schematic diagram of also Primordial Qi air inlet endless tube of the present invention.
Fig. 3 is the flow chart of the method for the invention.
Specific embodiment
Below in conjunction with drawings and Examples, specific embodiment of the invention is described in more details, so as to energy
Enough more fully understand the advantage of the solution of the present invention and its various aspects.However, specific embodiments described below and implementation
Example is only descriptive purpose, rather than limitation of the present invention.
As shown in figure 1, hot charging gas-based shaft kiln system of the present invention includes that gas-based shaft kiln 1, hot tank 2 are filled with heated conveying
Put 3.The gas-based shaft kiln 1 prepares iron for heat of reduction acid pellet, the hot tank 2 be used for the storage of thermal oxide pelletizing and
Insulation, the heat transfer apparatus 3 are used to convey thermal oxide pelletizing.The temperature of now described thermal oxide pelletizing is 1100-1300
DEG C, it is prepared by its thermal oxidation units 4 for passing through hereafter describe.System of the present invention can directly by the hot oxygen of said temperature
Pellet is used using the hot gas-based shaft kiln 1 that is transported to as raw material, without first lowering the temperature, reheating operation, has significantly been saved and is
System energy consumption.
As shown in figure 1, there is the hot tank 2 hot tank entrance and hot tank to export, the hot tank entrance with it is described
Heat transfer apparatus 3 are connected, and thermal oxide pelletizing is transported in hot tank 2 through heat transfer apparatus 3, is stored in hot tank 2, protected
Temperature, now the temperature of thermal oxide pelletizing is 950-1200 DEG C.
As depicted in figs. 1 and 2, the gas-based shaft kiln 1 is divided into reducing zone 101 and cooling cemented zone 102 from top to bottom, described
The bottom of reducing zone 101 is provided with also Primordial Qi air inlet endless tube, and the also Primordial Qi air inlet endless tube has multiple puff prots, and the gas base is erected
The reducing zone 101 of stove 1 is connected with hot tank outlet.The quantity of the multiple puff prot can be set according to actual needs, such as
Fig. 2 shown schematically only shows the structure of also Primordial Qi air inlet endless tube, and puff prot can also be replaced by hole.From the hot oxygen that hot tank 2 is released
Pellet enters gas-based shaft kiln 1, and also Primordial Qi is passed through from the also Primordial Qi air inlet endless tube, and the also Primordial Qi passes through each puff prot
Spray such as enters the gas-based shaft kiln, and then the thermal oxide pelletizing starts to be reduced by upstream thermal reduction gas, then down moves
To cooling cemented zone 102 through cooling, carburizing into after high-quality sponge iron product, from the discharge of the bottom of gas-based shaft kiln 1, in reduction process
In, thermal oxide pelletizing temperature is 800-1100 DEG C, and the temperature of the thermal reduction gas in the gas-based shaft kiln 1 is 850-1050 DEG C, should
Temperature is most suitable temperature in reduction iron process.The also Primordial Qi is usually H2With the gaseous mixture of CO, its ratio can be according to reality
Border needs to be adjusted, usual H2/CO=1.0~2.
As shown in figure 1, during reduction reaction, having gas generation, it may be defined as hot-top gas, usually, hot stove
Top gas temperature is 750-1050 DEG C, and hot-top gas, can be by exchanging heat back after discharge from the hot-top gas outlet discharge of gas-based shaft kiln 1
Receive, the laggard step for the treatment of such as sensible heat treatment is utilized, for example can be by heat recovery, for for system, other to need the device of heat
Or equipment heating etc..
In addition, the system may also include the feed arrangement 6 being arranged between the hot tank and the gas-based shaft kiln.Enter
Thermal oxide pelletizing is imported gas-based shaft kiln 1 by material device 6 from hot tank 2, and feed arrangement 6 can according to actual needs adjust charging speed
Degree.
As shown in figure 1, the system also includes thermal oxidation units 4, the thermal oxidation units 4 include chain bamboo trunk machine 401 and return
Rotary kiln 402, for preparing the thermal oxide pelletizing, green pellets passes sequentially through the chain bamboo trunk machine 401 and rotary kiln 402, via chain
Thermal oxide pelletizing is produced in drying, preheating and the oxidizing roasting of rotary kiln 402 of comb machine 401.By drying grate 401- rotary kilns 402
The thermal oxide pelletizing of production is sent into gas-based shaft kiln 1 by heat transfer apparatus 3, and high-quality sea is gradually reduced into gas-based shaft kiln 1
Continuous iron.
As shown in figure 1, the system may also include pelletizing room 5, the pelletizing room 5 is connected with the thermal oxidation units 4, uses
In raw material is made into green pellets, and the thermal oxidation units 4 are passed to, wherein raw material is usually iron ore.
According to system of the present invention, in the production process of acid pellet, system need not play the ring of cooling effect
Cold so that oxide pelletizing process is simplified.
As shown in figure 3, the present invention also provides a kind of method of utilization said system reduced iron, methods described includes following step
Suddenly：
As shown in figure 3, by raw material feeding pelletizing room 5, preparing the green pellets, wherein raw material is usually iron ore.
As shown in figure 3, green pellets being dried by chain bamboo trunk machine 401, being preheated, rotary kiln 402, the rotary kiln are sent to
402 pairs its carry out oxidizing roasting, prepare thermal oxide pelletizing.
As shown in figure 3, the thermal oxide pelletizing by heat transfer apparatus 3 by temperature for 1100-1300 DEG C is delivered to hot tank
2, the thermal oxide pelletizing of the hot tank 2 pairs is stored, is incubated, and now the temperature of thermal oxide pelletizing is 950-1200 DEG C.
System of the present invention directly can be made the thermal oxide pelletizing of said temperature using the hot gas-based shaft kiln 1 that is transported to as raw material
With without first lowering the temperature, reheating operation, significantly having saved system energy consumption.
As shown in figure 3, the thermal oxide pelletizing is delivered into the gas base from the hot tank 2 by feed arrangement 6 erecting
Stove 1.
As shown in figure 3, the thermal oxide pelletizing in the hot tank 2 to be delivered to the reducing zone 101 of the gas-based shaft kiln 1, enter
The temperature for entering the thermal oxide pelletizing of the gas-based shaft kiln 1 is 800 DEG C -1100 DEG C；Reduction is passed through from the also Primordial Qi air inlet endless tube
Gas, the also Primordial Qi is sprayed by each puff prot and such as enters the gas-based shaft kiln 1, the temperature of the thermal reduction gas for 850 DEG C-
1050℃；The also Primordial Qi is inversely contacted with the thermal oxide pelletizing, carries out reduction reaction, obtains reduced iron and hot-top gas,
Usually, temperature degree in hot-top is 750-1050 DEG C.
As shown in figure 3, the reduced iron obtains iron through the cooling of supercooling cemented zone 102, carburizing, the hot-top gas from
Hot-top gas outlet discharge, the heat is recyclable, heated for other need heat for system device or equipment etc..
Embodiment 1
The green pellets of iron ore pelletizing room production, produces via drying grate drying, preheating and rotary kiln oxidizing roasting
1200 DEG C of full iron is 67% hot iron concentrate acid pellet, and thermal oxide pelletizing is transported to hot tank through heat transfer apparatus, oxidation
Pelletizing charging temperature is 1050 DEG C, is stored in hot tank, is incubated, and about 950 DEG C of thermal oxide pelletizing is released from hot tank
Enter gas-based shaft kiln through feed arrangement, into gas-based shaft kiln reducing zone after i.e. start to be reduced by upstream thermal reduction gas, about
880 DEG C, the thermal reduction gas of H2/CO=1.8 enter shaft furnace, then down move to cooling cemented zone through cooling down, oozing from shaft furnace middle part
Carbon generates about 890 DEG C into degree of metalization 94.5%, carbon containing 2.1% high-quality sponge iron product after being reacted with acid pellet
Hot-top gas is discharged from shaft furnace top.
Embodiment 2：
The green pellets of iron ore pelletizing room production, produces via drying grate drying, preheating and rotary kiln oxidizing roasting
1280 DEG C of full iron is 57% hot iron concentrate acid pellet, and thermal oxide pelletizing is transported to hot tank through heat transfer apparatus, oxidation
Pelletizing charging temperature is 1110 DEG C, is stored in hot tank, is incubated, and about 1000 DEG C of thermal oxide pelletizing is released from hot tank
Enter gas-based shaft kiln through feed arrangement, into gas-based shaft kiln reducing zone after i.e. start to be reduced by upstream thermal reduction gas, about
900 DEG C, the thermal reduction gas of H2/CO=1.5 enter shaft furnace, then down move to cooling cemented zone through cooling down, oozing from shaft furnace middle part
Carbon generates about 945 DEG C into degree of metalization 90.5%, carbon containing 1.0% high-quality sponge iron product after being reacted with acid pellet
Hot-top gas is discharged from shaft furnace top.
It should be noted that each embodiment above by reference to described by accompanying drawing is only used to illustrate rather than limitation originally
The scope of invention, it will be understood by those within the art that, it is right under the premise without departing from the spirit and scope of the present invention
Modification or equivalent that the present invention is carried out, all should cover within the scope of the present invention.Additionally, signified unless the context
Outward, the word for occurring in the singular includes plural form, and vice versa.In addition, unless stated otherwise, then any embodiment
All or part of can combine any other embodiment all or part of use.
Claims (10)
1. a kind of hot charging gas-based shaft kiln system, it is characterised in that the system is perpendicular including heat transfer apparatus, hot tank and gas base
Stove；Wherein,
The heat transfer apparatus are used to convey thermal oxide pelletizing；
For the storage to the thermal oxide pelletizing and the hot tank of insulation there is hot tank entrance to be exported with hot tank, institute
Hot tank entrance is stated to be connected with the heat transfer apparatus；
The gas-based shaft kiln is divided into reducing zone and cooling cemented zone from top to bottom, and the reducing zone bottom is provided with also Primordial Qi air inlet
Endless tube, the also Primordial Qi air inlet endless tube has multiple puff prots, and the reducing zone of the gas-based shaft kiln exports phase with the hot tank
Even.
2. the system as claimed in claim 1, it is characterised in that the system also includes being arranged on the hot tank and the gas
Feed arrangement between base shaft furnace.
3. system as claimed in claim 1 or 2, it is characterised in that the system is also included for preparing the thermal oxide ball
The thermal oxidation units of group, the thermal oxidation units include chain bamboo trunk machine and rotary kiln.
4. system as claimed in claim 3, it is characterised in that the system also includes for raw material to be made into green pellets, and
The pelletizing room of the thermal oxidation units is passed to, the pelletizing room is connected with the thermal oxidation units.
5. the method for any system reducing iron of a kind of utilization claim 1-4, it is characterised in that methods described includes following
Step：
Thermal oxide pelletizing is delivered to hot tank by heat transfer apparatus, the hot tank is stored up to the thermal oxide pelletizing
Deposit, be incubated；
Thermal oxide pelletizing in the hot tank is delivered to the reducing zone of the gas-based shaft kiln, is led to from the also Primordial Qi air inlet endless tube
Enter also Primordial Qi, the also Primordial Qi is sprayed by each puff prot and such as enters the gas-based shaft kiln, also Primordial Qi and the thermal oxide
Pelletizing is inversely contacted, and carries out reduction reaction, obtains reduced iron and hot-top gas；
The reduced iron obtains iron through the cooling of supercooling cemented zone, carburizing, and the hot-top gas is exported from the hot-top gas
Discharge.
6. method as claimed in claim 5, it is characterised in that methods described is further comprising the steps of：
The thermal oxide pelletizing is delivered to by the gas-based shaft kiln from the hot tank by feed arrangement.
7. the method as described in claim 5 or 6, it is characterised in that methods described is further comprising the steps of：
Green pellets is dried by chain bamboo trunk machine, is preheated, be sent to rotary kiln, the rotary kiln carries out oxidizing roasting to it, prepared
Thermal oxide pelletizing.
8. method as claimed in claim 7, it is characterised in that methods described is further comprising the steps of：
By raw material feeding pelletizing room, the green pellets is prepared.
9. method as claimed in claim 7, it is characterised in that the temperature into the thermal oxide pelletizing of the gas-based shaft kiln is
800℃-1100℃。
10. method as claimed in claim 5, it is characterised in that the temperature of the thermal reduction gas is 850 DEG C -1050 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710137054.6A CN106755693A (en) | 2017-03-09 | 2017-03-09 | Hot charging gas-based shaft kiln system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710137054.6A CN106755693A (en) | 2017-03-09 | 2017-03-09 | Hot charging gas-based shaft kiln system and method |
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| CN106755693A true CN106755693A (en) | 2017-05-31 |
Family
ID=58961848
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| CN201710137054.6A Pending CN106755693A (en) | 2017-03-09 | 2017-03-09 | Hot charging gas-based shaft kiln system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110373537A (en) * | 2019-07-24 | 2019-10-25 | 武汉科技大学 | A kind of drying grate-Shaft Furnace Pelletizing Process roasting system and its application method |
| CN115522007A (en) * | 2021-06-25 | 2022-12-27 | 中晋冶金科技有限公司 | Production process of hot pellet reduced iron |
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| CN110373537A (en) * | 2019-07-24 | 2019-10-25 | 武汉科技大学 | A kind of drying grate-Shaft Furnace Pelletizing Process roasting system and its application method |
| CN115522007A (en) * | 2021-06-25 | 2022-12-27 | 中晋冶金科技有限公司 | Production process of hot pellet reduced iron |
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Application publication date: 20170531 |