CN207738780U - The discharge system of direct reduced iron gas-based shaft kiln - Google Patents
The discharge system of direct reduced iron gas-based shaft kiln Download PDFInfo
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- CN207738780U CN207738780U CN201721686713.3U CN201721686713U CN207738780U CN 207738780 U CN207738780 U CN 207738780U CN 201721686713 U CN201721686713 U CN 201721686713U CN 207738780 U CN207738780 U CN 207738780U
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Abstract
The utility model discloses the discharge system of direct reduced iron gas-based shaft kiln, which includes：Gas-based shaft kiln and heat exchange unit limit reduction section, discharging section, cooling section and discharging section in the gas-based shaft kiln from top to bottom.The gas-based shaft kiln includes material-loosing apparatus, the first flashboard, the second flashboard, air inlet pipe, exhaust pipe and rotary discharger.The system can significantly improve the air-tightness of gas-based shaft kiln reduction section, avoid thermal state metal pellet that secondary oxidation occurs during discharging, to improve the stability of gas-based shaft kiln work, and ensure the degree of metalization of product.
Description
Technical field
The utility model is related to metallurgical technology fields, specifically, the utility model is related to direct reduced iron gas bases to erect
The discharge system of stove.
Background technology
Although modern blast furnace ironmaking technology achieves significant progress, do not overcome it to high-quality metallurgical coke and excellent
The strong depend-ence of matter ore agglomerates, it is this dependence determine it must have from coking, sintering or pelletizing most Zhongdao blast furnace compared with
Long flow.Coking coal resource is an important factor for limitation blast furnace process further develops, although China is the big country of coal resources,
The resource of coking coal is extremely limited and distributional region is uneven, only accounts for 25% or so of coal resources total amount.With China's steel
Iron yield is developed by leaps and bounds (current production capacity has reached 800,000,000 tons/year), according to the coking coal resource in prediction China of the parties concerned
Only enough use 30 years.Importantly, coking and sintering are always disposal of pollutants rich and influential family in iron and steel enterprise, blast furnace stream is also determined
The damage ratio of journey is more serious, following to be limited by increasingly harsh in terms of the environmental protection.
Compared with traditional blast furnace process, gas-based shaft kiln directly reduced-steel scrap electric furnace route has flow relatively short, no
It needs that coking coal, single set equipment yield be big, the apparent technical advantage of effects of energy saving and emission reduction, there is huge development potentiality and wide
Market prospects.The direct reduced iron (DRI/HBI) of gas-based shaft kiln output is that the best steel scrap of the high-grade clean steel of electric furnace smelting is residual
The diluent for staying element is to improve China's steel scrap use ratio, reduce steel industry energy consumption and CO2Raw material necessary to discharge capacity.
But the unit production capacity for improving gas base directly reducing shaft furnace must be to improve the stability of shaft furnace equipment production and before continuity is
Put forward condition.
Currently, the discharge system of domestic gas-based shaft kiln fails to obtain ideal effect always, because of the metal of shaft furnace output
Pellet temperature is higher and oxidizable, so shaft furnace could be discharged after must being cooled to 200 DEG C or less under an inert atmosphere.State
The spiral discharging mode that interior shaft furnace uses has that air-tightness is bad, discharging spiral wear is serious and frequently gets stuck, seriously
The production direct motion and production capacity for influencing shaft furnace fully discharge.Therefore, existing gas-based shaft kiln discharge system still has much room for improvement.
Utility model content
The utility model is intended to solve at least some of the technical problems in related technologies.For this purpose, this reality
It is to propose the discharge system of direct reduced iron gas-based shaft kiln with a novel purpose.The system can significantly improve gas base
The air-tightness of reduction shaft furnace section avoids thermal state metal pellet that secondary oxidation occurs during discharging, perpendicular to improve gas base
The stability that furnaceman makees, and ensure the degree of metalization of product.
In the one side of the utility model, the utility model proposes a kind of dischargings of direct reduced iron gas-based shaft kiln
System.Embodiment according to the present utility model, the system include：
Gas-based shaft kiln limits reduction section, discharging section, cooling section and discharge zone, institute in the gas-based shaft kiln from top to bottom
Stating gas-based shaft kiln includes：
Material-loosing apparatus, the material-loosing apparatus are arranged in the discharging section, and the material-loosing apparatus includes the first rotary shaft and the second rotation
Axis, first rotary shaft and second rotary shaft are positioned opposite, in first rotary shaft respectively in axial direction between radial direction
Every being disposed with the first rotating vane, the second rotating vane is disposed with spaced radial respectively in axial direction in second rotary shaft,
In first rotary shaft and the second rotary shaft opposite side, first rotating vane and second rotating vane are handed over
Mistake distribution, and it is arranged with water cooling tube in first rotary shaft and second rotary shaft；
First flashboard, first flashboard are arranged in the discharging section and the lower section positioned at the material-loosing apparatus；
Second flashboard, second flashboard are arranged in the discharging section and the lower section positioned at first flashboard；
Air inlet pipe, the air inlet pipe are arranged in the cooling section bottom side of the wall；
Exhaust pipe, the exhaust pipe are arranged on the side wall of the cooling section upper end；
Rotary discharger, the rotary discharger are arranged in the discharge zone；
Heat exchange unit, the heat exchange unit include：
Surge tank, the surge tank have gas access and gas vent；
Heat exchanger tube, the heat exchanger tube is arranged in cold rinse bank and the rear end of the heat exchanger tube is connected with the gas access；
Aspiration pump, the aspiration pump are connected with the front end of the heat exchanger tube and the exhaust pipe respectively；
Compression pump, the compression pump are connected with the gas vent and air inlet pipe respectively.
According to the discharge system of the direct reduced iron gas-based shaft kiln of the utility model embodiment, by metallized pellet by gas
After the discharge of base reduction shaft furnace section, material enters discharging section, and under the conveying of discharging section Spiralism type material-loosing apparatus, material passes sequentially through the
One flashboard and the second flashboard enter cooling section；By closing the first flashboard and the second flashboard successively, it is possible to prevente effectively from blocking
Material, the air-tightness to ensure gas-based shaft kiln reduction section is good, and ensures that reduction section pressure maintains normal level；Wait for material into
Enter cooling section and after the first flashboard and the second flashboard close, by the way that the air inlet pipe in cooling section bottom side of the wall is arranged to cooling
Supply inert gas cools down thermal state metal pellet in section, and the inert gas after heat exchange is set in cooling section upper end side
Exhaust pipe discharge on wall, then the processing through each component of heat exchange unit to be to cool down, and return to cooling section and material is cooled down, from
And form the cycle of inertia cooling gas；Further, metallized pellet after cooling enters discharge zone, in discharge zone rotary unloading
Guiding system under the conveying of glassware falls into belt conveyor below and send to subsequent technique.The utility model is direct as a result,
The discharge system of reduced iron gas-based shaft kiln can significantly improve the air-tightness of gas-based shaft kiln reduction section, avoid thermal state metal ball
Secondary oxidation occurs during discharging for group, to improve the stability of gas-based shaft kiln work, and ensures the degree of metalization of product.
Optional, the discharging section includes from top to bottom the first converging transition and first isometrical section, and the material-loosing apparatus is arranged in
First converging transition, first flashboard and second flashboard are arranged in described first isometrical section.
Optional, first flashboard bottom end is 10~15cm at a distance from second flashboard top.
Optional, the angle between the side wall of first converging transition and first isometrical section of side wall is 5~15 degree.
Optional, the material-loosing apparatus includes first to third material-loosing apparatus, described first to third material-loosing apparatus from top to bottom between
Every being arranged in first converging transition, and the of the first rotary shaft and the second material-loosing apparatus of the first material-loosing apparatus and third material-loosing apparatus
One rotary shaft is vertical.
Optional, the cooling section includes the second divergent segment, second isometrical section and the second converging transition from top to bottom, it is described into
Tracheae is arranged on the side wall of second converging transition, and the exhaust pipe is arranged on the side wall of second divergent segment.
Optional, the air inlet pipe includes air inlet section and air outlet section, and the air inlet section is along vertical second converging transition
Sidewall direction extend into the cooling section, and the air outlet section is vertical with the air inlet section and the gas outlet of the air outlet section is towards institute
State discharge zone；Side wall of the exhaust pipe perpendicular to second divergent segment.
Optional, the air inlet pipe and the exhaust pipe are separately two, and described two air inlet pipe are distinguished
It is arranged on the opposite side wall of second converging transition, it is opposite that described two exhaust pipes are arranged in second divergent segment
On side wall, described two air inlet pipe and described two exhaust pipes are on the same vertical section of the cooling section.
Optional, the angle between the side wall of second divergent segment and second isometrical section of side wall is 15~60 degree,
Angle between second converging transition and second isometrical section of side wall is 30~60 degree.
Optional, one section of longitudinal section for being located at the discharge zone of the rotary discharger is circular arc, the rotary unloading
Glassware blade outer rim track and the inner wall distance for the discharge zone that the longitudinal section is circular arc are 2~4mm.
The additional aspect and advantage of the utility model will be set forth in part in the description, partly will be from following description
In become apparent, or recognized by the practice of the utility model.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the utility model will in the description from combination following accompanying drawings to embodiment
Become apparent and is readily appreciated that, wherein：
Fig. 1 is the discharge system structural representation according to the direct reduced iron gas-based shaft kiln of the utility model one embodiment
Figure；
Fig. 2 is the material-loosing apparatus structural schematic diagram according to the utility model one embodiment；
Fig. 3 is shown according to the discharge system structure of the direct reduced iron gas-based shaft kiln of the utility model further embodiment
It is intended to；
Fig. 4 is the discharging section structural schematic diagram according to the utility model one embodiment；
Fig. 5 is the cooling section structural schematic diagram according to the utility model one embodiment.
Specific implementation mode
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model
Limitation.
In the description of the present invention, it should be understood that term "center", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside",
The orientation or positional relationship of the instructions such as " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " is based on ... shown in the drawings
Orientation or positional relationship is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply the indicated dress
It sets or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as to the utility model
Limitation.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.The meaning of " plurality " is at least two, such as two in the description of the present invention,
It is a, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention unless specifically defined or limited otherwise, fisrt feature is "above" or "below" second feature
Can be that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, first is special
Sign second feature " on ", " top " and " above " can be fisrt feature and be directly above or diagonally above the second feature, or only
Indicate that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be with
It is that fisrt feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.
In the one side of the utility model, the utility model proposes a kind of dischargings of direct reduced iron gas-based shaft kiln
System.Embodiment according to the present utility model, with reference to figure 1~5, which includes：Gas-based shaft kiln and heat exchange unit, the gas base
Reduction section 100, discharging section 200, cooling section 300 and discharging section 400 are limited in shaft furnace from top to bottom.The gas-based shaft kiln includes
Material-loosing apparatus 210, the first flashboard 220, the second flashboard 230, air inlet pipe 310, exhaust pipe 320 and rotary discharger 410.
Below with reference to Fig. 1~5 pair according to the discharge system of the direct reduced iron gas-based shaft kiln of the utility model embodiment
It is described in detail：
Embodiment according to the present utility model, with reference to figure 2, material-loosing apparatus 210 is arranged in discharging section 200, and material-loosing apparatus 210 includes
First rotary shaft 2101 and the second rotary shaft 2102, the first rotary shaft 2101 and the second rotary shaft 2102 are positioned opposite, the first rotation
Be disposed with the first rotating vane in shaft 2101 with spaced radial respectively in axial direction, in the second rotary shaft 2102 respectively in axial direction and
Spaced radial is disposed with the second rotating vane, in 2102 opposite side of the first rotary shaft 2101 and the second rotary shaft, the first rotation
Blade and the second rotating vane are interspersed, and are arranged with water cooling tube in the first rotary shaft 2101 and the second rotary shaft 2102
(attached to be not shown in figure).Thus, it is possible to which being further conducive to thermal state metal pellet steadily enters discharge system, avoid occurring
It gets stuck, and by using axis water cooling, thermal state metal pellet can be carried out tentatively to cool down, avoid material secondary oxidation.
Embodiment according to the present utility model, the first flashboard 220 are arranged in discharging section 200 and under material-loosing apparatus 210
Side, the second flashboard 230 are arranged in discharging section 200 and the lower section positioned at the first flashboard 220.Inventor has found, in reduction shaft furnace section
After discharging, the first flashboard may be metallized pelletizing in closing process and choke, and generate gap and destroy air-tightness, pass through
The second flashboard is set in the lower section of the first flashboard, and certain interval of time (such as after 3~5s) turns off the after the first flashboard
Two flashboards can effectively prevent the second flashboard to be blocked again by pelletizing.Made as a result, by the joint of the first flashboard and the second flashboard
With can significantly increase the air-tightness of shaft furnace discharge system, can not only ensure that the pressure of reduction shaft furnace section maintains normal water
It is flat, and can prevent toxic gas effusion in shaft furnace from causing danger, moreover it is possible to prevent the inertia cooling gas of follow-up cooling section from oozing
Enter inside shaft furnace, influences the reproducibility of furnace atmosphere and the recycling of top gas.
Specific embodiment according to the present utility model, the first flashboard bottom end at a distance from the second flashboard top can be 10~
15cm.Thus, it is possible to further be conducive to the synergy of the first flashboard and the second flashboard, pelletizing is avoided to get stuck, influences shaft furnace
Air-tightness.
Specific embodiment according to the present utility model, the first flashboard and the second flashboard are made of heat-resistant and wear-resistant material, by
This, can further increase the stability of equipment.
Embodiment according to the present utility model, with reference to figure 4, discharging section 200 includes the first converging transition 201 and the from top to bottom
One isometrical section 202, material-loosing apparatus 210 is arranged in the first converging transition 201, and the first flashboard 220 and the second flashboard 230 are arranged in first etc.
Diameter section 202.Specific embodiment according to the present utility model, the first flashboard 220 can be at a distance from first isometrical section of 202 top
30~50cm.Thus, it is possible to further be conducive to that pelletizing is avoided to get stuck, shaft furnace air-tightness is influenced.
Specific embodiment according to the present utility model, the angle between the side wall of the first converging transition and first isometrical section of side wall
α is 5~15 degree.Thus, it is possible to further be conducive to the discharging of metallized pellet, and pelletizing is avoided to get stuck, it is airtight to influence shaft furnace
Property.
Specific embodiment according to the present utility model, with reference to figure 3, material-loosing apparatus 210 include first to third material-loosing apparatus 211~
213, i.e. the first material-loosing apparatus 211, the second material-loosing apparatus 212, third material-loosing apparatus 213, first to third material-loosing apparatus is spaced from top to bottom
It is arranged in the first converging transition 201, and the first of the first rotary shaft and the second material-loosing apparatus of the first material-loosing apparatus and third material-loosing apparatus
Rotary shaft is vertical.The thermal state metal pellet that reduction shaft furnace section is discharged is conveyed by using multiple material-loosing apparatus as a result, it can
It is got stuck with further avoiding pelletizing, and is further conducive to the preliminary cooling effect of pelletizing.
Embodiment according to the present utility model, air inlet pipe 310 are arranged in 200 bottom side of the wall of cooling section, 320 cloth of exhaust pipe
It sets on the side wall of 300 upper end of cooling section.It is blown inert gas to cooling section by using air inlet pipe, to accelerate thermal state metal
The cooling of pellet, and avoid secondary oxidation.
Specific embodiment according to the present utility model, with reference to figure 5, cooling section 300 includes the second divergent segment from top to bottom
301, second isometrical section 302 and the second converging transition 303, air inlet pipe 310 are arranged on the side wall of the second converging transition 303, exhaust pipe
320 are arranged on the side wall of the second divergent segment 301.
Specific embodiment according to the present utility model, air inlet pipe 310 include air inlet section 311 and air outlet section 312, air inlet section
311 extend into cooling section 300 along the sidewall direction of vertical second converging transition 303, and air outlet section 312 is vertical with air inlet section 311 and goes out
The gas outlet of gas section 312 is towards discharge zone 400；Side wall of the exhaust pipe 320 perpendicular to the second divergent segment 301.Thus, it is possible to effectively
Prevent the pelletizing to fall from smashing pipeline nozzle.Embodiment according to the present utility model, air inlet pipe 310 and exhaust pipe 320 it is interior
Diameter can be second isometrical section of 302 height h 1/20~1/15, specific embodiment according to the present utility model, h can be 2~
The internal diameter of 5m, air inlet pipe 310 and exhaust pipe 320 can be identical.Thus, it is possible to further increase to the cold of thermal state metal pellet
But efficiency.
The gas flow rate of specific embodiment according to the present utility model, air inlet pipe can be 0.5~3m/s, the gas of exhaust pipe
Body flow velocity could be provided as being more than air inlet pipe 0.2~1m/s of gas flow rate, thus, it is possible to further be conducive to following for cooling gas
Ring improves the cooling efficiency of metallized pellet.
Specific embodiment according to the present utility model, air inlet pipe 310 and exhaust pipe 320 are separately two, and
Two air inlet pipe 310 are arranged on the opposite side wall of the second converging transition 303, and two exhaust pipes 320 are arranged in second
On the opposite side wall of divergent segment 301, the same vertical section of two air inlet pipe 310 and two exhaust pipes 320 in cooling section 300
On.Thus, it is possible to further increase the cooling efficiency to thermal state metal pellet.
Specific embodiment according to the present utility model, with reference to figure 5, the side wall of the second divergent segment 301 and second isometrical section 303
Angle β between side wall is 15~60 degree, the angle γ between the second converging transition 303 and second isometrical section of 303 side wall for 30~
60 degree.Thus, it is possible to further be conducive to the cooling of metallized pellet.
Embodiment according to the present utility model, rotary discharger 410 are arranged in discharge zone 400.It is according to the present utility model
Specific embodiment, rotary discharger can be made of heat-resistant and wear-resistant material.Can by adjusting rotary discharger rotating speed 3~
20r/min, to obtain different discharging speeds.In view of the operating pressure of certain gas-based shaft kilns is up to 0.5MPa or so, because
This is proposed with the mode of intermittent take-off to ensure the pressure stability of reduction shaft furnace section.
Specific embodiment according to the present utility model is located at one section of longitudinal section of the discharge zone 400 of rotary discharger 410
For circular arc, 410 blade outer rim track of rotary discharger and the inner wall distance for the discharge zone that longitudinal section is circular arc are 2~4mm.By
This, can control the spacing is not more than metallized pellet diameter 50~70%, to prevent pelletizing from passing through in blade and discharging section
Gap between wall leaks out and the discharging speed that occurs phenomenon out of control.
The discharging section cross section of specific embodiment according to the present utility model, rotary discharger position could be provided as
It is long:It is wide=1~4 it is rectangular.
Embodiment according to the present utility model, heat exchange unit include surge tank 510, heat exchanger tube 520, aspiration pump 530 and pressure
Contracting pump 540.Wherein, surge tank 510 has gas access and gas vent；Heat exchanger tube 520 is arranged in cold rinse bank 521 and exchanges heat
The rear end of pipe 520 is connected with the gas access of surge tank 510；Aspiration pump 530 respectively with the front end of heat exchanger tube 520 and exhaust pipe
320 are connected；Compression pump 540 is connected with the gas vent of surge tank 510 and air inlet pipe 310 respectively.The hot gas of cooling section discharge
It first passes around aspiration pump and then is cooled down by the heat exchanger tube with sink, finally return to surge tank；It is cold in surge tank
But gas returns to cooling section using compression pump and air inlet pipe.Inert gas after cooling section exchanges heat to metallized pellet as a result, passes through
The exhaust pipe discharge being arranged on the side wall of cooling section upper end, then the processing through each component of heat exchange unit to be to cool down, and return to cooling
Section cools down material, to form the cycle of inertia cooling gas.
As a result, according to the discharge system of the direct reduced iron gas-based shaft kiln of the utility model embodiment, by the ball that metallizes
After group is discharged by gas-based shaft kiln reduction section, material enters discharging section, and under the conveying of discharging section Spiralism type material-loosing apparatus, material is successively
Enter cooling section by the first flashboard and the second flashboard；By closing the first flashboard and the second flashboard successively, it is possible to prevente effectively from
It gets stuck, the air-tightness to ensure gas-based shaft kiln reduction section is good, and ensures that reduction section pressure maintains normal level；It waits for
Material enters cooling section and after the first flashboard and the closing of the second flashboard, by the way that the air inlet pipe in cooling section bottom side of the wall is arranged
It supplies inert gas into cooling section to cool down thermal state metal pellet, the inert gas after heat exchange is set in cooling section
Exhaust pipe discharge on the side wall of upper end, then the processing through each component of heat exchange unit to be to cool down, and return to cooling section and material is carried out
It is cooling, to form the cycle of inertia cooling gas；Further, metallized pellet after cooling enters discharge zone, in discharge
Guiding system under the conveying of section rotary discharger, falls into belt conveyor below and send to subsequent technique.This practicality is new as a result,
The discharge system of the direct reduced iron gas-based shaft kiln of type can significantly improve the air-tightness of gas-based shaft kiln reduction section, avoid hot
Secondary oxidation occurs during discharging for metallized pellet, to improve the stability of gas-based shaft kiln work, and ensures product
Degree of metalization.
Below with reference to specific embodiment, the utility model is described, it should be noted that these embodiments are only
Descriptive, without limiting the utility model in any way.
Embodiment 1
After thermal state metal pellet is discharged in gas-based shaft kiln reduction section, the first flashboard and the second flashboard, hot gold are opened successively
Belong to pellet to start to fall into the cooling section of lower section by reduction shaft furnace section.The gas flow rate of cooling section bottom inflow pipe is 0.5m/s,
The gas flow rate of exhaust outlet is 0.7m/s.
After reduction shaft furnace section discharges, it is first shut off the first flashboard, the second flashboard is turned off after 3s.Pelletizing is in cooling section
Rotary discharger is opened after middle cooling 3h, metallized pellet after cooling is exported to belt conveyor by rotating speed 5r/min.
For the gas-based reduction shaft furnace that reduction section operating pressure is 0.5MPa or so, using discharging provided by the utility model
System, in addition to the operating pressure of reducing gas for shaft furnace can be made to stablize in 0.5MPa, the N of furnace reduction section2Volume fraction is less than
1%, top gas can be recycled for a long time, will not be because of N2Circulative accumulation be affected.
Embodiment 2
After thermal state metal pellet is discharged in gas-based shaft kiln reduction section, the first flashboard and the second flashboard, hot gold are opened successively
Belong to pellet to start to fall into the cooling section of lower section by reduction shaft furnace section.The gas flow rate of cooling section bottom inflow pipe is 3m/s, row
The gas flow rate of gas port is 4m/s.
After reduction shaft furnace section discharges, it is first shut off the first flashboard, the second flashboard is turned off after 5s.Pelletizing is in cooling section
Rotary discharger is opened after middle cooling 6h, metallized pellet after cooling is exported to belt conveyor by rotating speed 60r/min.
For the gas-based reduction shaft furnace that reduction section operating pressure is 0.5MPa or so, using discharging provided by the utility model
System, in addition to the operating pressure of reducing gas for shaft furnace can be made to stablize in 0.5MPa, the N of furnace reduction section2Volume fraction is less than
1%, top gas can be recycled for a long time, will not be because of N2Circulative accumulation be affected.
Embodiment 3
After thermal state metal pellet is discharged in gas-based shaft kiln reduction section, the first flashboard and the second flashboard, hot gold are opened successively
Belong to pellet to start to fall into the cooling section of lower section by reduction shaft furnace section.The gas flow rate of cooling section bottom inflow pipe is 2m/s, row
The gas flow rate of gas port is 3m/s.
After reduction shaft furnace section discharges, it is first shut off the first flashboard, the second flashboard is turned off after 4s.Pelletizing is in cooling section
Rotary discharger is opened after middle cooling 5h, metallized pellet after cooling is exported to belt conveyor by rotating speed 15r/min.
For the gas-based reduction shaft furnace that reduction section operating pressure is 0.5MPa or so, using discharging provided by the utility model
System, in addition to the operating pressure of reducing gas for shaft furnace can be made to stablize in 0.5MPa, the N of furnace reduction section2Volume fraction is less than
1%, top gas can be recycled for a long time, will not be because of N2Circulative accumulation be affected.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
It states and is necessarily directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be with
It can be combined in any suitable manner in any one or more of the embodiments or examples.In addition, without conflicting with each other, this field
Technical staff can by the feature of different embodiments or examples described in this specification and different embodiments or examples into
Row combines and combination.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are in the scope of the utility model
Inside it can make changes, modifications, alterations, and variations to the above described embodiments.
Claims (10)
1. a kind of discharge system of direct reduced iron gas-based shaft kiln, which is characterized in that including：
Gas-based shaft kiln limits reduction section, discharging section, cooling section and discharge zone, the gas in the gas-based shaft kiln from top to bottom
Base shaft furnace includes：
Material-loosing apparatus, the material-loosing apparatus are arranged in the discharging section, and the material-loosing apparatus includes the first rotary shaft and the second rotary shaft, institute
It states the first rotary shaft and second rotary shaft is positioned opposite, arranged respectively in axial direction with spaced radial in first rotary shaft
There is the first rotating vane, the second rotating vane is disposed with spaced radial respectively in axial direction in second rotary shaft, described
First rotary shaft and the second rotary shaft opposite side, first rotating vane and second rotating vane staggeredly divide
Cloth, and it is arranged with water cooling tube in first rotary shaft and second rotary shaft；
First flashboard, first flashboard are arranged in the discharging section and the lower section positioned at the material-loosing apparatus；
Second flashboard, second flashboard are arranged in the discharging section and the lower section positioned at first flashboard；
Air inlet pipe, the air inlet pipe are arranged in the cooling section bottom side of the wall；
Exhaust pipe, the exhaust pipe are arranged on the side wall of the cooling section upper end；
Rotary discharger, the rotary discharger are arranged in the discharge zone；
Heat exchange unit, the heat exchange unit include：
Surge tank, the surge tank have gas access and gas vent；
Heat exchanger tube, the heat exchanger tube is arranged in cold rinse bank and the rear end of heat exchanger tube is connected with the gas access of surge tank；
Aspiration pump, the aspiration pump are connected with the front end of the heat exchanger tube and the exhaust pipe respectively；
Compression pump, the compression pump are connected with the gas vent and air inlet pipe respectively.
2. system according to claim 1, which is characterized in that the discharging section includes the first converging transition and the from top to bottom
One isometrical section, the material-loosing apparatus is arranged in first converging transition, and first flashboard and second flashboard are arranged in described
First isometrical section.
3. system according to claim 2, which is characterized in that first flashboard bottom end and second flashboard top
Distance is 10~15cm.
4. system according to claim 2, which is characterized in that the side wall of first converging transition and described first isometrical section
Angle between side wall is 5~15 degree.
5. according to claim 2~4 any one of them system, which is characterized in that the material-loosing apparatus includes first loose to third
Glassware, described first to third material-loosing apparatus arranged for interval is in first converging transition from top to bottom, and the first material-loosing apparatus and
First rotary shaft of three material-loosing apparatus and the first rotary shaft of the second material-loosing apparatus are vertical.
6. system according to claim 1, which is characterized in that the cooling section includes the second divergent segment, the from top to bottom
Two isometrical sections and the second converging transition, the air inlet pipe are arranged on the side wall of second converging transition, and the exhaust pipe is arranged in
On the side wall of second divergent segment.
7. system according to claim 6, which is characterized in that the air inlet pipe includes air inlet section and air outlet section, it is described into
Gas section extend into the cooling section along the sidewall direction of vertical second converging transition, and the air outlet section is vertical with the air inlet section
And the gas outlet of the air outlet section is towards the discharge zone；Side wall of the exhaust pipe perpendicular to second divergent segment.
8. system according to claim 7, which is characterized in that the air inlet pipe and the exhaust pipe are separately two
It is a, and described two air inlet pipe are arranged on the opposite side wall of second converging transition, described two exhaust pipe difference
It is arranged on the opposite side wall of second divergent segment, described two air inlet pipe and described two exhaust pipes are in the cooling section
On the same vertical section.
9. system according to claim 8, which is characterized in that the side wall of second divergent segment and described second isometrical section
Angle between side wall is 15~60 degree, and the angle between second converging transition and second isometrical section of side wall is 30~60
Degree.
10. system according to claim 1, which is characterized in that be located at the one of the discharge zone of the rotary discharger
The longitudinal section of section is circular arc, the rotary discharger blade outer rim track and the longitudinal section be the discharge zone of circular arc inner wall away from
From for 2~4mm.
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| CN201721686713.3U CN207738780U (en) | 2017-12-06 | 2017-12-06 | The discharge system of direct reduced iron gas-based shaft kiln |
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| CN201721686713.3U CN207738780U (en) | 2017-12-06 | 2017-12-06 | The discharge system of direct reduced iron gas-based shaft kiln |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116769994A (en) * | 2023-08-25 | 2023-09-19 | 山西冶金工程技术有限公司 | Material loosening device of gas-based reduction shaft furnace |
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2017
- 2017-12-06 CN CN201721686713.3U patent/CN207738780U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116769994A (en) * | 2023-08-25 | 2023-09-19 | 山西冶金工程技术有限公司 | Material loosening device of gas-based reduction shaft furnace |
| CN116769994B (en) * | 2023-08-25 | 2023-11-17 | 山西冶金工程技术有限公司 | Material loosening device of gas-based reduction shaft furnace |
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