AU2020102043A4 - Injection-type spiral agitator for hot metal desulfurization - Google Patents
Injection-type spiral agitator for hot metal desulfurization Download PDFInfo
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- AU2020102043A4 AU2020102043A4 AU2020102043A AU2020102043A AU2020102043A4 AU 2020102043 A4 AU2020102043 A4 AU 2020102043A4 AU 2020102043 A AU2020102043 A AU 2020102043A AU 2020102043 A AU2020102043 A AU 2020102043A AU 2020102043 A4 AU2020102043 A4 AU 2020102043A4
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- injection
- hot metal
- agitating
- desulfurization
- porous
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D27/00—Stirring devices for molten material
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses an injection-type spiral agitator for hot metal desulfurization.
An agitating shaft is provided with a porous injection head (6) and a spiral agitating
blade (4); blades of the agitating blade (4) are uniform in size and are
5 circumferentially and uniformly distributed at intervals; and the center of the overall
agitating shaft communicates up and down to form a cavity-shaped through injection
pipe (7), a lower end of the through injection pipe (7) is forked and runs through the
porous injection head (6) to form a plurality of small injection guide pipes (8), and
each of the small injection guide pipes (8) passes through an outer surface of the
10 porous injection head (6), so that a desulfurizing agent passes through the through
injection pipe (7) to be injected to the outside of the porous injection head (6) from
top to bottom in multiple directions. A mixing region, used for axially and radially
agitating the desulfurizing agent, may be expanded by the agitating blade, the
entrainment circulation flow may be increased, the shearing power consumption may
15 be reduced, and the stress condition of the agitating blade may be improved; a motion
mode of steam of the desulfurizing agent in hot metal may be further improved into a
spiral ascending motion mode, and the dissolution degree of the desulfurizing agent is
increased, so that effective desulfurization is realized; and the injection-type spiral
agitator is suitable for a long and thin desulfurization hot metal ladle and meets the
20 demands on a current agitation and injection combined desulfurization process.
1/4
6
Fig. 1
Description
1/4
6 Fig. 1
Injection-type Spiral Agitator for Hot metal Desulfurization
TECHNICAL FIELD The present invention belongs to the field of desulfurization devices for hot metal
pretreatment and particularly relates to an injection-type spiral agitator for hot metal
desulfurization.
BACKGROUND With rapid development of modern indusial production as well as science and
technology, the requirement on steel quality is increasing day by day, which requires
that a hot metal pre-desulfurization device is continuously upgraded and improved,
the content of sulfur in hot metal is effectively reduced, the loss of a desulfurizing
agent is reduced, and thus, the production cost is reduced. An existing KR (Kambara
Reactor) agitating desulfurization method is good in kinetic characteristics and stable
in desulfurization, but has obvious defects that the hot metal and the desulfurizing
agent flow in a symmetric cycle way due to the rotation action of an agitating shaft,
the agitating shaft rotates to form a columnar rotation region nearby, the desulfurizing
agent is difficult to disperse in both the columnar rotation region and a "dead region"
at a bottom of an agitating head so as to be gathered into a mass and small in flow rate,
thus resulting in relatively poor diffusion effect and reaction kinetic conditions of the
desulfurizing agent in a bottom molten pool. However, a desulfurization lance
adopted in a traditional injection method is low in desulfurization reaction speed due
to insufficient agitating capability to cause a phenomenon that some desulfurizing
powder floats into slag without participating in desulfurization and some
desulfurization products are still retained in the hot metal due to flotation
insufficiency to result in resulfurization, so that a desulfurization effect may not be
achieved, and the desulfurization efficiency is low. Based on the local mixing characteristics of conventional KR agitating desulfurization, scholars at home and abroad have carried out a lot of research on improving the kinetic conditions of a mechanical agitating desulfurization reaction of the hot metal so as to increase the reaction efficiency of the mechanical agitating desulfurization of the hot metal and the economic index of a hot metal desulfurization technology. For example, a Chinese patent entitled Agitator for Hot Metal Desulfurization with the application number of
200910060770.4 discloses a three-blade agitator with an agitating blade of which a
hot metal facing surface and a hot metal sheltering surface are both front inclined
surfaces, according to the agitator, due to the adoption of a three-blade forward
inclination structure, the agitation entrainment space and entrainment circulation flow
are enhanced, an included angle between the blades is increased from traditional 90°
to 120°, the slag bonding speed of the blades is reduced, the bonded slag is convenient
to clear, and the stability of agitating strength is improved; however, inclined planar
structures of the hot metal facing surface and the hot metal sheltering surface of the
agitating blade result in limited inclination angles, or else, the distance that an upper
end of the agitating blade deviates from an agitating shaft core is excessively longer
than the distance that a lower end of the agitating blade deviates from the agitating
shaft core to result in rotary agitation unbalance of the agitator, and particularly, after
the agitating blade is non-uniformly worn and cracks strip, the unbalance problem is
extremely serious to even endanger the safety of an agitation system, and therefore, an
improving effect is not obvious. In addition, a patent entitled Efficient Mixing
Agitator for Hot metal Desulfurization with the application number of
201710582931 .0 discloses an agitator with a spiral structure, wherein upper and
lower end surfaces of the agitator are horizontal planes, hot metal facing surfaces and
the hot metal sheltering surfaces of the agitator are spiral surfaces and an outer side
surface is a circular truncated cone arc surface of which the radius is large in an upper
part and small in a lower part, and therefore, the precise fabrication of an agitator with a small number of blades for a large-sized hot metal ladle is realized, the problem of agitation unbalance caused by eccentric distance inconsistence of the agitating blade with the planar structure is overcome, meanwhile, due to the adoption of the spiral surface structure, the balanced stress and erosive wear of a single point in the plane are realized, the shape structure of the blade of the agitator in a service process is maintained, furthermore, the safe and stable operation of an agitating apparatus is guaranteed, however, problems of a small mixing region of the agitator and poor desulfurization effect in the columnar rotation region and the "dead region" at a bottom of an agitating head are still not fundamentally solved. In addition, continuous research is performed based on the current situations such as kinetic condition insufficiency of traditional injection desulfurization and easy blockage of a nozzle, for example, a patent entitled Multi-swirling-flow-dispersion Anti-blocking Hot Metal
Injection Desulfurization Lance with the application number of 201510903159.9
discloses a porous desulfurization lance additionally provided with an auxiliary spray
head in addition to a main spray head on a lance body to enhance the injection gas
flux so that desulfurization particles are more uniformly dispersed in hot metal; in
addition, a nozzle is provided with a groove to achieve the aim of preventing the
overall lance from being blocked; moreover, the lance body is enabled to do
self-rotation motion, so that certain agitating power is enhanced, but the lance does
not have a blade structure and is narrow in rotation range so as not to effectively
improve the flowing characteristic of the hot metal, an inner core of the lance is
required to be frequently replaced, the operation is complex, and therefore, the lance
is difficult to popularize. Moreover, for overcoming defects of the above-mentioned
two desulfurization ways, the scholars propose an agitation and injection combined
desulfurization way by combining the KR method with the injection method, for
example, the patent entitled Injection and Agitation Combined Hot metal Pretreatment
Desulfurization Apparatus and Method with the application number of
2014103391859.7 discloses an apparatus which includes a loading system, a lifting
system and a hot metal holding and conveying system and is additionally provided
with an injection system, an agitation system and a hot metal ladle cover
desulfurization device, all parts of the apparatus are closely connected to form a
whole, a powder is sprayed from an injection pipe to hot metal by virtue of a carrier
gas while agitation is performed, and therefore, the injection and agitation combined
hot metal pretreatment desulfurization method increases the desulfurization rate
compared with the injection method and reduces the temperature drop of the hot metal
compared with the KR agitation method. Although the apparatus has the advantages
of a mechanical agitation process and an injection process, the apparatus is
inconvenience to disassemble as a whole, if one part is out of work, an overall powder
injection agitator is required to be changed, and therefore, the cost is relatively high.
Seen from the above-mentioned research, with the development and progress of a
novel blade agitator, an agitating apparatus of a KR agitating desulfurization device
achieves a certain improvement on a mixing effect, but the problem of agitating and
mixing uniformity in the axial columnar rotation region and the "dead region" at the
bottom is not effectively solved. As for the problem of the adaptability of an existing
agitating desulfurization and injection desulfurization technologies to a "long and
thin" hot metal ladle and the problem of a way of changing multi-pipe injection
mixing, there is no effective injection-type desulfurization agitating apparatus which
has been provided at present, and it is urgent to develop a novel combined agitator
with excellent performances to meet the demand on the "agitation and injection
combined" desulfurization process of the current agitator and achieve the aims that
the agitating blade strengthens the axial flow and radial flow of agitation, and
agitation particles injected by the injection pipe may uniformly and effectively react
with the hot metal, so that the kinetics of the mechanical agitating desulfurization reaction of the hot metal may be further improved, the desulfurization efficiency and the effective utilization ratio of the desulfurizing agent may be increased, the agitating time may be shortened, and the service life of the agitating blade may be prolonged.
SUMMARY The technical problem to be solved by the present invention is to provide an
injection-type spiral agitator for hot metal desulfurization, which is good in kinetic
characteristics of agitation, stable in desulfurization effect, low in deep desulfurization
cost, simple and convenient in injection method and device, low in temperature drop
and low in loss; axial and radial agitating and mixing regions of a desulfurizing agent
in a mechanical agitating desulfurization process of hot metal may be obviously
expanded, the entrainment circulation flow may be increased, the shearing power
consumption may be reduced, and the stress condition of an agitating blade may be
improved; and meanwhile, a motion mode of steam of the desulfurizing agent in the
hot metal may be further improved, and the dissolution degree of the desulfurizing
agent is increased, so that sulfur in the hot metal is efficiently removed.
In order to solve the above-mentioned technical problem, a main technical solution
adopted in the present invention includes:
an injection-type spiral agitator for hot metal desulfurization is characterized in that
an agitating shaft is provided with a porous injection head (6) and a spiral agitating
blade (4); blades of the agitating blade (4) are uniform in size and are uniformly
distributed at intervals in a circumferential direction of the agitating shaft; and the
porous injection head (6) is arranged at a lowest end of the agitating shaft, an upper
part of the agitating shaft is fixedly connected with an upper fastening device, a
central cavity of the overall agitating shaft communicates up and down to form a
through injection pipe (7), a lower end of the through injection pipe (7) is forked and runs through the porous injection head (6) to form a plurality of small injection guide pipes (8), and each of the small injection guide pipes (8) runs through an outer surface of the porous injection head (6), so that a desulfurizing agent passes through the through injection pipe (7) to be injected to the outside of the porous injection head (6) from top to bottom in multiple directions.
Further, the agitating blade (4) is configured to divide the overall agitating shaft into
an upper agitating shaft (2) and a lower agitating shaft (5) and is arranged in a region
between the upper agitating shaft (2) and the lower agitating shaft (5); and spiral
directions of the blades of the agitating blade (4) are set to be reverse to a rotary
agitation direction in a circumferential direction to form a reverse torsion angle
opposite to the rotary agitation direction.
Further, each of the spiral blades of the agitating blade (4) includes a hot metal facing
surface and a hot metal sheltering surface, and a connecting surface between the hot
metal facing surface and the hot metal sheltering surface smoothly extends to form a
ridge surface; the hot metal facing surface includes a front inclination angle of the hot
metal upstream surface and a radial internal inclination angle; the hot metal facing
surface forms an included angle with respect to a vertical direction, namely the front
inclination angle of the hot metal facing surface; and the hot metal facing surface
forms an included angle from bottom to top in a radial direction and the vertical
direction, namely the radial internal inclination angle.
Further, the porous injection head (6) is a hemisphere or an inverted conical sphere.
Further, a height h of the lower agitating shaft (5) between the agitating blade (4) and
the porous injection head (6) is 1/3-1/2 times of a height H of the agitating blade (4).
Further, each of the injection guide pipes (8) inside the porous injection head (6) is
arranged at a same included angle, preferably, an included angle of 45°-60°, with a
central shaft of the through injection pipe (7).
Further, a height r of the porous injection head (6) is 1/3-1/2 times of the height h of
the lower agitating shaft (5). Further, the injection guide pipes (8) are arranged at
intervals and at an included angle of 30°-90°.
Preferably, diameters of the injection guide pipes (8) are 8-15 mm, a diameter of the
through injection pipe (7) is 1-2 cm greater than the diameters of the small injection
guide pipes (8), and a distance from an outer side wall of the through injection pipe (7)
to an inner wall of the agitating shaft ranges from 5 cm to 10 cm.
Further, the upper fastening device is a flange connecting piece (1), and the flange
connecting piece (1) is in butt joint with an upper agitating device in a threaded
connection way or an elastic fixture connection way.
Preferably, an upper end of the flange connecting piece of the agitator is provided
with four connecting pin keys which are same in size and 3-8 cm higher than a flange
connecting piece of a lance, so that a flange of the agitator is in butt joint with the
agitating device.
Further preferably, the reverse torsion angle is 30°-60°.
Further preferably, a front inclination angle a of the hot metal facing surface is
10-5.50.
Further, preferably, a radial internal inclination angle P is 0.5°-3.5°.
One end of each of the above-mentioned injection guide pipes is an immersed end and
enters a hot metal ladle and is immersed under a liquid level of the hot metal when
being used, the other end of the guide pipe is connected with the through injection
pipe, and a top of the through injection pipe is connected with the desulfurizing agent
and a high-pressure power air source; and for the above-mentioned injection head,
preferably, three injection guide pipes are provided, are uniformly distributed along a
circumferential direction of a tail end of a cavity of the through injection pipe and are
capable of making desulfurization gas do spiral ascending motion in the hot metal
during agitation.
According to the injection-type spiral agitator for hot metal desulfurization, preferably,
a thickness of a refractory material layer is 10-20 cm.
In conclusion, according to the injection-type spiral agitator for hot metal
desulfurization, provided by the present invention, each blade of the agitating blade
includes the hot metal facing surface and the hot metal sheltering surface, and the hot
metal facing surface includes the front inclination angle and the radial internal
inclination angle; one injection pipe runs through the center of an agitator main body
and is connected with the plurality of small injection guide pipes at the porous
injection head, the included angle between the injection guide pipes is 30°-90°, and
the injection head is of a hemispherical or inverted conical spherical structure; during
actual production, a mixing region, used for axially and radially agitating the
desulfurizing agent, may be expanded by the agitating blade, the entrainment
circulation flow may be increased, the shearing power consumption may be reduced, and the stress condition of the agitating blade may be improved; due to the porous injection head arranged at a tail part of the agitator, a motion mode of steam of the desulfurizing agent in the hot metal may be further improved into a spiral ascending motion mode, the retention time of the desulfurizing agent in the hot metal is prolonged by extending a motion path, and the dissolution degree of the desulfurizing agent is increased, so that effective desulfurization is realized; and the injection-type spiral agitator is suitable for a "long and thin" desulfurization hot metal ladle and meets the demand on a current agitation and injection combined desulfurization process. The agitator effectively integrates the advantages of good kinetic characteristics, stable desulfurization effect and low deep desulfurization cost of a conversional KR agitation method and the various advantages of simple and convenient device, low temperature drop and low loss of an injection method to achieve an agitation and injection combined" desulfurization way of the agitator.
Compared with the prior art, the present invention has the following advantages:
1) according to the injection-type spiral agitator for hot metal desulfurization,
provided by the present invention, by arranging the front inclination angle of the hot
metal facing surface of each spiral blade of the agitating blade, radially inwards
inclining an outer blade and twisting the blade to be spiral, the erosion resistance of
the agitating blade is enhanced, the thermal mechanical stress on the surface of the
agitating blade is uniform, the stress damage of the agitating blade is delayed, and
thus the service life of the agitator is prolonged; 2) according to the injection-type
spiral agitator for hot metal desulfurization, provided by the present invention, the
lower agitating shaft is provided with a plurality of injection outlets with the same
sizes to ensure that the steam of the desulfurizing agent does rotation motion in the
hot metal, and particulate steam does spiral ascending motion in the hot metal due to
the action of a buoyancy of the steam of the desulfurizing agent, a route of the spiral motion is longer than a linear motion, so that the contact time of the steam of the desulfurizing agent and the hot metal is greatly prolonged, meanwhile, the mass transfer conditions of desulfurization particles are improved to ensure that more particulate steam is dissolved in the hot metal, so that the desulfurization efficiency is improved; and 3) according to the injection-type spiral agitator for hot metal desulfurization, provided by the present invention, the mixing region used for axially and radially agitating the desulfurizing agent in a mechanical agitating desulfurization process of a hot metal machine may be expanded during actual production, the kinetic condition of agitating desulfurization of the hot metal may be improved, the mixing and dispersing depth of the desulfurizing agent may be increased, the hazard of agitation unbalance may be avoided, and the injection-type spiral agitator for hot metal desulfurization is suitable for the "long and thin" desulfurization hot metal ladle and meets the demand on the current "agitation and injection combined" desulfurizationprocess.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of an overall structure of an injection-type spiral agitator
for hot metal desulfurization, provided by the present invention;
Fig. 2 is a top view of the overall structure provided by the present invention;
Fig. 3 is a front view of an agitating blade in Fig. 1;
Fig. 4 is a top view of the agitating blade in Fig. 3;
Fig. 5 and Fig. 6 are front views of an untwisted agitating blade in Fig. 3; and
Fig. 7 is a perspective view of a through injection pipe and injection guide pipes in
Fig. 1.
Symbols of parts in the figures are as follows: flange connecting piece 1, upper
agitating shaft 2, refractory material layer 3, agitating blade 4, lower agitating shaft 5, porous injection head 6, through injection pipe 7 and injection guide pipe 8.
DETAILED DESCRIPTION The injection-type spiral agitator for hot metal desulfurization, provided by the present invention, is further described in detail below in conjunction with
accompanying drawings and specific embodiments.
As shown in Fig. 1 which is a schematic diagram of an overall structure of an injection-type spiral agitator for hot metal desulfurization, implemented according to
the present invention, the injection-type spiral agitator for hot metal desulfurization,
provided by the present invention, includes a flange connecting piece 1 and an agitator main body located below the flange connecting piece 1, and is characterized
in that the agitator main body includes an agitating blade 4 closely and fixedly
connected to an agitating shaft and a porous injection head 6, and the agitating shaft is formed by butt joint of an upper agitating shaft 2 and a lower agitating shaft 5; the
outside of the upper agitating shaft 2 is coated with a refractory material layer 3 made
of a refractory material; a top of the upper agitating shaft 2 is connected to the flange connecting piece 1, and the agitating blade 4 is fixedly connected to a region between
a bottom of the upper agitating shaft 2 and a top of the lower agitating shaft 5; a hollow through injection pipe is formed at the center of the agitating shaft from top to
bottom, i.e., the center of the top of the upper agitating shaft 2 and the center of a bottom of the lower agitating shaft 5 vertically communicate with each other to form a
through injection pipe 7, and the through injection pipe 7 at a region where the
agitating blade 4 is located and the through injection pipe 7 in the upper agitating shaft 2 and the lower agitating shaft 5 are consistent in pore diameter and
communicate with each other; the bottom of the lower agitating shaft 5 is fixedly
connected with the porous injection head 6 below the agitating blade 4; and the through injection pipe 7 is forked at a junction of the lower agitating shaft 5 and the
porous injection head 6 to form a plurality of injection guide pipes 8, and the plurality of injection guide pipes 8 run through the porous injection head 6 to form uniformly spaced through holes in an outer surface of the porous injection head 6. Preferably, included angles between the plurality of injection guide pipes 8 are 30°-90°.
As shown in Fig. 1, the porous injection head 6 is a hemisphere or an inverted conical
sphere, and a height r of the porous injection head 6 is 1/3-1/2 times of a height h of
the lower agitating shaft 5. A height H of the agitating blade 4 is far greater than the height h of the lower agitating shaft 5.
As shown in Fig. 1 to Fig. 4, the agitating blade 4 is composed of a plurality of spiral
blades with uniform sizes, the spiral blades are uniformly distributed at intervals in a circumferential direction of the upper agitating shaft 2, and each of the spiral blades is
a right spiral agitating blade rotating in a direction opposite to a rotary agitation direction (clockwise direction), i.e., seen from top to bottom (a top view in Fig. 4), an upper end of each spiral blade is leftwards arranged relative to a lower end of the
spiral blade to form a reverse torsion angle y opposite to the rotary agitation direction, and preferably, the reverse torsion angle y is 30°-60°
Preferably, a gradually expansive stepped circular truncated cone connection is formed from the top of the upper agitating shaft 2 to the top of the agitating blade 4,
and a bottom surface of a circular truncated cone at a lowest layer of the upper agitating shaft 2 is aligned to a central shaft part of the agitating blade 4. Therefore,
the strengths of the agitating blade and the agitating shaft may be improved. An outer
surface or outer layer of each corresponding circular truncated cone is coated with the refractory material layer 3 made of the refractory material.
Each of the spiral blades includes a hot metal facing surface and a hot metal sheltering surface, and the hot metal facing surface includes a front inclination angle a of the hot
metal facing surface and a radial internal inclination angle P. As shown in Fig. 5, the hot metal facing surface of each spiral blade forms an included angle a with respect to a vertical direction, namely the front inclination angle a of the hot metal facing surface, preferably, the front inclination angle a of the hot metal facing surface of each spiral blade is 1°-5.5°. As shown in Fig. 6, each spiral blade forms an included angle P from bottom to top in a radial direction and the vertical direction, namely the radial internal inclination angle P from bottom to top of each spiral blade. Preferably, the radial internal inclination angle P is 0.5°-3.5°. As shown in Fig. 1 and Fig. 3, a peripheral surface of each spiral blade of the agitating blade 4 extends from top to bottom to be a smooth curved surface with a smooth extending radian, so that a surface or band with a certain thickness, instead of a sharp edge, is formed at the periphery of each spiral blade.
As shown in Fig. 6, the porous injection head 6 is a hemisphere or an inverted conical
sphere, a plurality of injection guide pipes 8 which are uniform in pore diameter are uniformly distributed at intervals on the outer surface of the porous injection head 6 to form a plurality of through holes communicating with the through injection pipe 7,
and each of the injection guide pipes 8 forms an angle 6 with a central shaft of the through injection pipe 7, preferably, the angle 6 is 45°-60°. As shown in Fig. 1, the
through injection pipe 7 is embedded in centers of upper and lower agitators, and the
pore diameters of the injection guide pipes 8 are smaller than or equal to the pore diameter of the through injection pipe 7. Preferably, the diameter of the through
injection pipe 7 is 1-2 cm greater than the diameters of the injection guide pipes 8, the diameters of the injection guide pipes are 8-15 mm, and a distance from an outer side
wall of the through injection pipe 7 to an inner wall of a region where the agitating
shaft (the upper agitating shaft 2 and the lower agitating shaft 5) and the agitating blade 4 are located ranges from 5 cm to 10 cm, so that it is ensured that the through
injection pipe 7 may not be damaged by high-temperature hot metal when the agitator
works in the hot metal.
Embodiment 1 The agitating blade 4 adopts three spiral agitating blades uniformly arranged in the circumferential direction of the agitating shaft, the front inclination angle a of the hot metal facing surface of each spiral agitating blade is 3, the radial internal inclination angle P from bottom to top of each spiral agitating blade is 1.5°, and the reverse torsion angle y of each spiral agitating blade is 60°; and three small injection guide pipes are adopted at the porous injection head, the diameter of the through injection pipe 7 is 25 mm, the diameters of the small injection guide pipes are 15 mm, an angle 6 formed by each of the small injection guide pipes 8 and the central shaft is 45°, and other contents are identical to the above-mentioned content.
Embodiment 2 The agitating blade 4 adopts four spiral agitating blades uniformly arranged in the circumferential direction of the agitating shaft, the front inclination angle a of the hot
metal facing surface of each spiral agitating blade is 1.5°, the radial internal inclination angle P from bottom to top of each spiral agitating blade is 0.75°, and the reverse torsion angle y of each spiral agitating blade is 30; and four small injection
guide pipes are adopted at the porous injection head, the diameter of the through injection pipe 7 is 25 mm, the diameters of the small injection guide pipes are 10 mm,
an angle 6 formed by each of the small injection guide pipes and the central shaft is
60°, and other contents are identical to the above-mentioned content.
The present invention provides the injection-type spiral agitator for hot metal desulfurization. During injection, desulfurization particles carried by high-pressure
power gas pass through the through injection pipe and then are uniformly injected into
the hot metal by virtue of the plurality of guide pipes, and an outlet gas flux of each of the injection guide pipes is 0.4-4 m 3/h (such as 0.5 m 3/h, 1 m 3/h, 2.2 m 3/h, 3m 3/h and
3.5 m 3/h).
In the above-mentioned injection desulfurization process, preferably, the density of
the desulfurization particles in nitrogen is 5-25 kg/m3 during injection. If the density of the particles in nitrogen is too high, the desulfurization reaction may be violent, and therefore, splashing may be produced; and if the density of the particles in nitrogen is too low, the time consumption of the desulfurization process is too high to affect the desulfurization rhythm.
In conclusion, the injection-type spiral agitator for hot metal desulfurization, provided
by the present invention, includes the agitator main body at the lower part of the
flange connecting piece, wherein the agitator main body includes the agitating blade and the porous injection head which are both closely and fixedly connected with the
upper agitating shaft and the lower agitating shaft; the agitating blade includes the hot metal facing surface and the hot metal sheltering surface, and the hot metal facing
surface includes the front inclination angle and the radial internal inclination angle; one injection pipe runs through the center of the agitator main body, and is connected
with the plurality of small injection guide pipes at the porous injection head, the included angles between the injection guide pipes is 30°-90°, and the porous injection head is of a conical structure. During actual production, a mixing region used for
axially and radially agitating the desulfurizing agent by the agitating blade may be expanded, the entrainment circulation flow may be increased, the shearing power
consumption may be reduced, and the stress condition of the agitating blade may be
improved; due to the adoption of the porous injection head arranged at the tail of the agitator, a motion mode of steam of the desulfurizing agent in the hot metal may be
further improved into a spiral ascending motion, and the dissolution degree of the desulfurizing agent is increased, so that effective desulfurization is realized; and the
injection-type spiral agitator is suitable for a "long and thin" desulfurization hot metal
ladle and meets the demand on a current agitation and injection combined desulfurization process.
Compared with a current novel combined agitator, the injection-type spiral agitator for hot metal desulfurization avoids the defects of narrow agitation direction range,
insufficient agitating strength, nonuniform stress of the agitating blade and short service life during gas carrying, and realizes 360° all-directional agitation in the hot metal, and has the effect that the agitating strength is nearly doubled.
All other parts that are not described in detail fall within the prior art. Although the
present invention is described in detail by the above-mentioned embodiments, the embodiments are only a part of embodiments of the present invention, not all of the
embodiments. People may further obtain other embodiments based on the present
embodiments without creative work, and all these embodiments fall within the protection scope of the present invention.
Claims (10)
1. An injection-type spiral agitator for hot metal desulfurization, characterized in that
an agitating shaft is provided with a porous injection head (6) and a spiral agitating
blade (4), wherein blades of the agitating blade (4) are uniform in size and are
circumferentially and uniformly distributed at intervals; and the center of the overall
agitating shaft communicates up and down to form a cavity-shaped through injection
pipe (7), a lower end of the through injection pipe (7) is forked and runs through the
porous injection head (6) to form a plurality of small injection guide pipes (8), and
each of the small injection guide pipes (8) passes through an outer surface of the
porous injection head (6), so that a desulfurizing agent passes through the through
injection pipe (7) to be injected to the outside of the porous injection head (6) from
top to bottom in multiple directions.
2. The injection-type spiral agitator for hot metal desulfurization according to claim 1,
characterized in that the agitating blade (4) is configured to divide the overall
agitating shaft into an upper agitating shaft (2) and a lower agitating shaft (5) and is
arranged at a region between the upper agitating shaft (2) and the lower agitating shaft
(5); and a spiral direction of each of the blades of the agitating blade (4) is set to be
reverse to a rotary agitation direction in a circumferential direction to form a reverse
torsion angle opposite to the rotary agitation direction.
3. The injection-type spiral agitator for hot metal desulfurization according to claim 1,
characterized in that each of the spiral blades of the agitating blade (4) comprises a
hot metal facing surface and a hot metal sheltering surface, and a connecting surface
between the hot metal facing surface and the hot metal sheltering surface smoothly
extends to form a ridge surface; the hot metal facing surface comprises a front inclination angle of the hot metal upstream surface and a radial internal inclination angle; the hot metal facing surface forms an included angle with respect to a vertical direction, namely the front inclination angle of the hot metal upstream surface; and the hot metal facing surface forms an included angle from bottom to top in a radial direction and the vertical direction, namely the radial internal inclination angle.
4. The injection-type spiral agitator for hot metal desulfurization according to claim 1,
characterized in that the porous injection head (6) is a hemisphere or an inverted
conical sphere.
5. The injection-type spiral agitator for hot metal desulfurization according to claim 1,
characterized in that a height h of the lower agitating shaft (5) between the agitating
blade (4) and the porous injection head (6) is 1/3-1/2 times of a height H of the
agitating blade (4).
6. The injection-type spiral agitator for hot metal desulfurization according to claim 1,
characterized in that each of the injection guide pipes (8) inside the porous injection
head (6) is arranged at a same included angle with a central shaft of the through
injection pipe (7).
7. The injection-type spiral agitator for hot metal desulfurization according to claim 1,
characterized in that a height r of the porous injection head (6) is 1/3-1/2 times of the
height h of the lower agitating shaft (5).
8. The injection-type spiral agitator for hot metal desulfurization according to claim 1,
characterized in that each of the injection guide pipes (8) is arranged at an included
angle of 45°-60° with the central shaft of the through injection pipe (7); and the injection guide pipes (8) are arranged at intervals and at an included angle of 30°-90°.
9. The injection-type spiral agitator for hot metal desulfurization according to claim 1,
characterized in that an upper part of the agitating shaft is fixedly connected with a
flange connecting piece (1), and the flange connecting piece (1) is in butt joint with an
upper agitating device in a threaded connection way or an elastic fixture connection
way.
10. The injection-type spiral agitator for hot metal desulfurization according to claim
1, wherein the reverse torsion angle is 30°-60°, the front inclination angle a of the hot
metal facing surface is 1-5.5°, and the radial internal inclination angle P is 0.5°-3.5°.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911052470.1A CN110699508B (en) | 2019-10-31 | 2019-10-31 | Blowing type spiral stirrer for molten iron desulphurization |
| CN201911052470.1 | 2019-10-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2020102043A4 true AU2020102043A4 (en) | 2020-10-08 |
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ID=69203168
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2020102043A Ceased AU2020102043A4 (en) | 2019-10-31 | 2020-08-28 | Injection-type spiral agitator for hot metal desulfurization |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110699508B (en) |
| AU (1) | AU2020102043A4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112892879A (en) * | 2021-01-13 | 2021-06-04 | 于时茂 | Processing apparatus is added to ore dressing medicament |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4143493A1 (en) * | 2020-04-29 | 2023-03-08 | Novelis, Inc. | Scrap submergence device and molten metal recycling system |
| CN111729545B (en) * | 2020-06-11 | 2022-03-15 | 武汉钢铁有限公司 | Combined stirring blade metal core for molten iron KR desulfurization stirrer |
| CN112011663A (en) * | 2020-08-31 | 2020-12-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Composite molten iron desulphurization stirring head with blade cooling function |
| CN113337675B (en) * | 2021-06-04 | 2023-07-14 | 辽宁科技大学 | Molten iron desulfurization device and method |
| CN114657306A (en) * | 2022-04-01 | 2022-06-24 | 山东钢铁股份有限公司 | Stirring head and method for promoting graphite precipitation in molten iron pretreatment |
| CN115246642B (en) * | 2022-07-05 | 2024-01-30 | 北京科技大学 | High-purity crystalline graphite and preparation method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1254763A (en) * | 1998-11-25 | 2000-05-31 | 鞍山钢铁集团公司 | Desulfurizing method and equipment by co-stirring of machine and gas |
| CN2352542Y (en) * | 1998-11-25 | 1999-12-08 | 鞍山钢铁集团公司 | Mechanical, gaseous composite agitation type desulfurising apparatus |
| JP2005068506A (en) * | 2003-08-26 | 2005-03-17 | Sumitomo Metal Ind Ltd | Desulfurization method and equipment for molten iron |
| CN108342536B (en) * | 2018-03-09 | 2019-11-08 | 武汉钢铁有限公司 | Desulfurizing iron is with from pulse blender |
| CN108546795B (en) * | 2018-05-10 | 2020-04-07 | 武汉钢铁有限公司 | Molten iron global stirring desulfurization stirrer and use method thereof |
| CN109207671B (en) * | 2018-10-24 | 2020-01-10 | 东北大学 | Immersion type desulfurization device with mechanical stirring |
-
2019
- 2019-10-31 CN CN201911052470.1A patent/CN110699508B/en active Active
-
2020
- 2020-08-28 AU AU2020102043A patent/AU2020102043A4/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112892879A (en) * | 2021-01-13 | 2021-06-04 | 于时茂 | Processing apparatus is added to ore dressing medicament |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110699508B (en) | 2022-02-01 |
| CN110699508A (en) | 2020-01-17 |
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