CN213179464U - Top-blown powder spraying system for electric furnace smelting and integrated furnace cover system thereof - Google Patents
Top-blown powder spraying system for electric furnace smelting and integrated furnace cover system thereof Download PDFInfo
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- CN213179464U CN213179464U CN202020684613.2U CN202020684613U CN213179464U CN 213179464 U CN213179464 U CN 213179464U CN 202020684613 U CN202020684613 U CN 202020684613U CN 213179464 U CN213179464 U CN 213179464U
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- 238000005507 spraying Methods 0.000 title claims abstract description 52
- 238000003723 Smelting Methods 0.000 title claims abstract description 42
- 239000007921 spray Substances 0.000 claims abstract description 75
- 230000005540 biological transmission Effects 0.000 claims abstract description 49
- 238000007664 blowing Methods 0.000 claims abstract description 42
- 239000011819 refractory material Substances 0.000 claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 52
- 238000002347 injection Methods 0.000 claims description 24
- 239000007924 injection Substances 0.000 claims description 24
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- 238000012806 monitoring device Methods 0.000 claims description 12
- 210000001503 joint Anatomy 0.000 claims description 10
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Abstract
The utility model provides a top-blown powder spraying system for electric furnace smelting and an integrated furnace cover system thereof. The powder spraying system comprises a lifting spiral spray gun, a lifting mechanism, a driving unit, a telescopic rotary joint and a gas powder supply device. The liftable spiral spray gun comprises a spiral spray pipe with a constant spiral angle and a refractory material; the lifting mechanism comprises a driving unit, a flange base, a long-tooth roller, a gear and a transmission screw pair with a penetrating central tube, the gear is fixedly sleeved on the transmission screw pair and can be matched with the long-tooth roller to drive the rotation of the transmission screw pair to ascend or descend, and the central tube of the transmission screw pair communicates the spiral spray tube with a telescopic rotary joint connected with the gas powder supply device. The utility model has the advantages that: the blowing angle can be kept unchanged for a long time; the weight is light, and the requirement on the installation height limit of the furnace top is low; the multi-point powder spraying can be realized, and each top-blowing powder spraying system can operate independently or in a linkage manner, so that the smelting effect of the electric furnace is improved.
Description
Technical Field
The utility model relates to an electric stove metallurgical technology field, concretely relates to top-blown system of dusting that electric stove was smelted and integrated bell system of top-blown dusting that electric stove was smelted, it can be in specific smelting task period, spout in the metal liquid through the air current that will contain the powder to evenly spray powder and/or accuse sediment in to the molten bath, thereby for smelting the good reaction dynamics condition of creation, be favorable to strengthening the metallurgical process, improve and smelt the effect.
Background
Generally, the electric furnace smelting process is a chemical reaction process of various elements, the smelting effect is directly determined by full contact of the elements, and powder spraying into molten metal is to create good chemical reaction conditions.
At present, the powder spraying device used by the electric furnace is mainly a furnace wall inclined-insertion type spray gun, the spray gun is obliquely inserted into the furnace wall, a preset included angle is formed between the spray gun and a horizontal plane, and a certain angle is formed between the spray gun and the normal direction on the horizontal plane. The mechanism has many problems in the use process, for example, tight combination of the spray gun and the furnace wall can not be realized, and further cracking occurs, so that molten metal or molten slag leaks, and safety accidents are caused; the burning loss of the spray gun cannot be compensated, and the service cycle is short.
In addition, some manufacturers adopt a furnace top oblique-insertion type spray gun, but a spray gun cantilever is inevitably long, the installation occupied height space is large, the spray gun is generally interfered by furnace top machinery, and most of the spray guns cannot form a complete application scheme; the oblique insertion angle is small, and the requirements of the process on the angle cannot be met generally; in addition, under the influence of high temperature, the inclined insertion gun rod is easy to deform and bend greatly and cannot be inserted, pulled and replaced; and the spraying point is fixed, so that dynamic spraying scanning cannot be realized, the blind area is very large, the mixing of the whole flow field is not uniform, and the metallurgical effect is not good.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve at least one of the above-mentioned not enough of prior art existence. For example, an object of the present invention is to provide a powder spraying device for electric furnace smelting that can replace an oblique-insertion type powder spraying device to avoid the problems of furnace wall cracking and leakage, burning loss unable compensation, gun body bending unable replacement, many blowing blind areas, etc.
In order to achieve the above object, an aspect of the present invention provides a top-blown powder spraying system for electric furnace smelting, comprising a liftable spiral spray gun, a lifting mechanism, a driving unit, a telescopic rotary joint and a gas powder supply device, wherein the liftable spiral spray gun comprises a spiral spray pipe and a refractory material, the spiral spray pipe has a constant spiral lift angle, a feed inlet and a discharge outlet, and the refractory material can wrap the spiral spray pipe; the lifting mechanism comprises a driving unit, a flange base, a long-tooth roller, a gear and a transmission screw pair with a penetrating central tube, the long-tooth roller is arranged on the flange base, the gear is fixedly sleeved on the transmission screw pair and can be matched with the long-tooth roller so as to drive the transmission screw pair to rotatably ascend or descend, the lower end of the central tube of the transmission screw pair is communicated with the feed inlet of the spiral spray tube, and the driving unit is connected with the long-tooth roller and can control the forward rotation or the reverse rotation of the long-tooth roller; the telescopic rotary joint is arranged to communicate the gas powder supply device with the upper end of a central tube of a transmission screw pair (also called a screw transmission pair) and can move telescopically under the drive of the transmission screw pair.
The utility model discloses an on the other hand provides an integrated bell system of top-blown dusting that electric stove was smelted, the integrated system of top-blown dusting include electric stove bell and one or evenly lay more than two as above the electric stove smelt top-blown dusting system, the electric stove bell is set up to the suit and is in each flange base below just being located each liftable spiral spray gun top simultaneously outside each transmission revolute pair in the top-blown dusting system of one or evenly laying more than two.
Compared with the prior art, the beneficial effects of the utility model include at least one of following content: the blowing angle can be kept unchanged after the head of the spray gun is burnt to any length; the service life of the spray gun can be greatly prolonged by compensating the burning loss length through lifting; the lifting of the transmission screw pair is realized through the matching of the long-tooth roller and the gear, the weight is light, and the requirement on the installation height limit of the furnace top is low; the multi-point powder spraying can be realized, and each top-blowing powder spraying system can operate independently or in a linkage manner, so that the smelting effect of the electric furnace is improved.
Drawings
FIG. 1a shows a schematic top view of an exemplary embodiment of a top-blown powder injection system for electric furnace smelting according to the present invention;
FIG. 1b shows a schematic cross-sectional view of FIG. 1a along section A-A;
FIG. 1c shows a schematic cross-sectional view of FIG. 1a along section B-B;
FIG. 2 is a schematic structural view of a liftable helical spray gun in an exemplary embodiment of the top-blown powder injection system for electric furnace smelting according to the present invention;
FIG. 3 shows a schematic structural view of a retractable swivel in an exemplary embodiment of a top-blown powder injection system for electric furnace smelting according to the present invention;
FIG. 4 shows an enlarged cross-sectional view of the dynamic gas seal I of the drive screw pair of FIG. 1 c;
fig. 5 shows a schematic top view of an electric furnace top-blown powder injection smelting process using an exemplary embodiment of the integrated top-blown powder injection furnace lid system of the present invention.
The reference numerals are explained below:
a lifting spiral spray gun 10, a spiral spray pipe 11 and a refractory material 12;
the lifting mechanism 20, the flange base 21, the long-tooth roller 22, the gear 23, the transmission screw pair 24, the nut 24a, the screw shaft 24b, the inert gas injection port 24c and the annular diversion trench 24 d;
the device comprises a telescopic rotary joint 30, a medium inlet connecting flange 31, a first self-lubricating sealing ring 32a, a second self-lubricating sealing ring 32b, a static end outer cylinder 33, a first-stage middle joint 34, a second-stage middle joint 35, a third-stage middle joint 36, a medium outlet connecting flange 37, a positive pressure gas inlet 38 and a mechanical labyrinth sealing component 39.
Detailed Description
Hereinafter, the top-blown powder injection system for electric furnace smelting and the integrated furnace lid system thereof according to the present invention will be described in detail with reference to the exemplary embodiments. It should be understood that, in the present invention, the terms "upper end" and "lower end" and "upper end portion" and "lower end portion" are used for convenience of describing the relative structural relationship of the different components with each other, and are not strictly limited in position, for example, when the retractable swivel joint of the present invention is laid flat in a non-mounted state, the "upper end" and "lower end" and the "upper end portion" and "lower end portion" may also be referred to as "left end" and "right end" and "left end" and "right end" respectively. In addition, the terms "first", "second", and "third" are used only to distinguish different components, and are not strictly sequential limitations.
In an exemplary embodiment of the present invention, the top-blown powder spraying system for electric furnace smelting may include a liftable spiral spray gun, a lifting mechanism, a driving unit, a retractable rotary joint, and a gas powder supply device.
The liftable spiral spray gun can be composed of a spiral spray pipe and refractory materials. The spiral spray pipe can be formed by a spiral metal pipe with a spiral angle of a constant degree and two openings at two ends, and the openings at two ends can be respectively used as a feed inlet and a discharge outlet. The spiral nozzle having a constant helix angle can have a desired blowing angle and direction even if it is melted down by the high temperature of electric furnace smelting. The constant lead angle may be selected to be a certain value, for example, 30 °, in the range of 15 to 45 °. The refractory material can wrap the spiral spray pipe, so that the high-temperature-resistant melting loss time of the spiral spray pipe is prolonged. The composition of the refractory material can be determined according to the reaction conditions or slag components in the smelting furnace so as to reduce the pollution caused by falling of the refractory material.
The lifting mechanism may include a drive unit, a flange base, a long tooth roller, a gear, and a drive screw pair having a central tube therethrough. Wherein, the long tooth cylinder is arranged on the flange base and can rotate in the forward direction and the reverse direction. For example, the long-toothed roller may be disposed on the flange base in the up-down direction (i.e., the direction parallel to the drive screw pair). The gear is fixedly sleeved on the transmission screw pair and can be matched with the long-tooth roller, so that the transmission screw pair can ascend or descend in a rotating mode through meshing matching under the driving of forward rotation or reverse rotation of the long-tooth roller. The driving unit is connected with the long-tooth roller and can control the long-tooth roller to rotate in the forward direction or the reverse direction. For example, the drive unit may include a motor and a reducer. Furthermore, the drive unit can also be integrated inside the long-toothed drum. In addition, the drive screw pair may include a nut and a screw shaft. The center tube may be disposed through the screw shaft along the center line. The nut is sleeved outside the spiral shaft in a spiral matching mode and is provided with an inert gas injection port and an annular diversion groove which are communicated with each other. For example, an annular deflector groove may be provided along the inner circumference of the nut. The inert gas can be introduced through the inert gas injection port, positive pressure or air leakage can be formed in the direction of the liftable spiral spray gun (for example, in an electric furnace) by the inert gas through the annular drainage groove, the nut and the spiral matching structure (equivalent to a labyrinth mechanical sealing structure) of the spiral shaft, and the transmission spiral pair can be protected, for example, the temperature of the spiral pair is reduced and the spiral pair is prevented or less corroded by the atmosphere in the furnace.
The telescopic rotary joint is arranged to communicate the gas powder supply device with the upper end of the central tube of the transmission screw pair and can be extended or shortened (which can be called telescopic motion) under the driving of the ascending or descending of the transmission screw pair. The lower end of the central tube of the transmission screw pair is communicated with the feed inlet of the spiral spray tube. That is to say, the air flow containing the particle powder generated by the air powder supply device is sequentially sprayed into the electric furnace through the telescopic rotary joint, the transmission screw pair and the liftable spiral spray gun so as to uniformly spray powder and/or control slag in the molten pool. For example, the gas stream containing the particulate powder may be a stream of inert gas containing carbon powder or a stream of gas required for smelting containing carbon powder. For example, the particle size of the granular powder may be less than 100 mesh.
In the present exemplary embodiment, the telescopic rotary joint may include an inlet connection, a stationary end outer cylinder, a multi-stage intermediate joint, and an outlet connection.
The inlet connecting piece is provided with a lower end part connected with the upper end of the static end outer cylinder and an upper end part communicated with the gas powder supply device so as to communicate the upper end of the static end outer cylinder with the gas powder supply device. For example, the upper end of the inlet connection may communicate with the air powder supply device through a powder delivery pipe. The powder conveying pipe can be a gas hose containing granular powder. Furthermore, the inlet connection can be a connection flange, which is not easily releasable compared to a threaded connection.
The multi-stage middle section is composed of a first sleeve, a second sleeve and a third sleeve which are sleeved in sequence from outside to inside. The third sleeve can extend downwards or contract upwards in the second sleeve to realize telescopic movement; the second sleeve can extend downwards or contract upwards in the first sleeve to realize telescopic movement; the first sleeve can extend downwards or contract upwards in the static end outer barrel to realize telescopic movement. For example, a spiral matching structure is arranged between the third sleeve and the second sleeve so as to realize the rotary motion of the third sleeve in the second sleeve and further realize the telescopic motion; a spiral matching structure is arranged between the second sleeve and the first sleeve so as to realize the rotary motion of the second sleeve in the first sleeve and further realize the telescopic motion; the first sleeve pipe and the static end outer pipe are provided with a spiral matching structure, so that the first sleeve pipe can rotate in the static end outer pipe, and the telescopic movement can be realized. That is to say, can realize rotatory concertina movement through helical structure cooperation between each adjacent sleeve pipe in multistage intermediate node, and between outermost sleeve pipe and the quiet end outer tube. However, the present invention is not limited to this, and for example, the telescopic movement other than the rotational telescopic movement may be realized by other matching manners between each adjacent sleeve pipe in the multi-stage middle section and between the outermost sleeve pipe and the outer pipe at the stationary end. In addition, the upper end of each sleeve of the multi-stage middle section can be funnel-shaped (or named as conical), so that powder is not easy to accumulate. That is, the upper ends of the respective sleeves constituting the multi-stage intermediate section may collectively form a tapered cavity having a funnel-shaped cross section in the flow direction of the fluid containing the granular powder.
The telescopic rotary joint of the present exemplary embodiment can have a long stroke with a small height (or when being laid flat, which can be called a length) by providing the multi-stage intermediate joint composed of the first, second, and third sleeves. However, the present invention is not limited thereto. For example, the number of casings of the multi-stage intermediate section can also be 2 or 4 or even more.
The outlet connection has an upper end fixedly connected to the lower end of a third casing (i.e., the innermost casing in the multi-stage intermediate section) and a lower end communicating with the upper end of the central tube of the drive screw pair to communicate the third casing with the central tube of the drive screw pair. Preferably, the outlet connection can be a further connection flange, which is not easily releasable in comparison with a threaded connection. The ascending or descending (also called rotary telescopic motion) of the transmission screw pair can drive the multi-stage middle section such as the first sleeve, the second sleeve and the third sleeve, so as to realize the telescopic motion (for example, rotary telescopic motion) of each sleeve in the multi-stage middle section.
In addition, on the basis of the structure, the telescopic rotary joint can further comprise a first sealing element and two groups of second sealing elements, wherein the first sealing element and the two groups of second sealing elements are arranged between the first sleeve and the static end outer cylinder. The first sealing element can be composed of a first self-lubricating rubber ring matched with the first sealing groove arranged on the outer circumference of the upper end of the first sleeve, and a first mechanical labyrinth sealing component arranged at the lower end of the static end outer cylinder. The group of second sealing elements can be composed of a second self-lubricating rubber ring matched with each other, a second sealing groove arranged on the outer circumference of the upper end of the second sleeve and a second mechanical labyrinth sealing component arranged at the lower end of the first sleeve; the other set of the second seal members may be constituted by a third self-lubricating rubber ring and a third seal groove provided on an outer circumference of an upper end of the third sleeve, which are fitted to each other, and a third mechanical labyrinth seal member provided at a lower end of the second sleeve. Through setting up first sealing member and second sealing member, the utility model discloses a but scalable rotary joint can have between each sleeve pipe of the multistage intermediate segment of flexible displacement each other and/or form good sealed between multistage intermediate segment and the quiet end outer tube, prevents that the powder from revealing, ensures the stability of using to increase of service life.
Further, the retractable swivel may further comprise a positive pressure gas access. The positive pressure gas access port is arranged at the lower part of the static end outer barrel and can be communicated with a cavity formed by the inner wall of the static end outer barrel and the outer wall of the first sleeve. The positive pressure gas access port can communicate the chamber with a gas source (e.g., an inert gas source) having a gas pressure higher than the powder delivery tube gas pressure. Through setting up the gaseous access mouth of malleation, the utility model discloses a scalable rotary joint can prevent effectively that the powder from getting into the cavity between quiet end urceolus and the middle festival, causes the card stopper to further increase rotary joint life.
In another exemplary embodiment of the present invention, the top-blown powder spraying system for electric furnace smelting may further include a spray gun monitoring device and/or a control unit based on the structure of the above exemplary embodiment. The spray gun monitoring device is arranged to detect the position of the discharge hole of the spiral spray pipe or the spraying direction in real time. For example, the lance monitoring device may be provided as an infrared video monitoring device that can look down at the blowing conditions (e.g., the location of the discharge orifice or the blowing direction). The control unit is arranged to receive a signal which is provided by the spray gun detection device and corresponds to the position of the discharge hole of the spiral spray pipe or the blowing direction, and controls the driving unit according to the signal to adjust the position of the discharge hole or the blowing direction. In addition, the control unit may be arranged to be able to directly control the drive unit such that the driving screw pair drives the screw nozzle in a complete revolution or sector sweep at a predetermined angular velocity. In addition, in another exemplary embodiment, the control unit is not provided, and the driving screw pair can drive the spiral nozzle to rotate or scan in a fan shape at a predetermined angular speed by operating the direction or the timing of the forward rotation or the reverse rotation of the driving unit.
FIG. 1a shows a schematic top view of an exemplary embodiment of a top-blown powder injection system for electric furnace smelting according to the present invention; FIG. 1b shows a schematic cross-sectional view of FIG. 1a along section A-A; FIG. 1c shows a schematic cross-sectional view of FIG. 1a along section B-B. Fig. 2 shows a schematic structural diagram of a liftable spiral spray gun in an exemplary embodiment of the top-blown powder spraying system for electric furnace smelting of the present invention. Fig. 3 shows a schematic structural view of a telescopic rotary joint in an exemplary embodiment of the top-blown powder spraying system for electric furnace smelting according to the present invention. Fig. 4 shows an enlarged sectional view of the dynamic gas seal I of the drive screw pair of fig. 1 c.
As shown in fig. 1a, 1b and 1c, in another exemplary embodiment of the present invention, the top-blown powder injection system for electric furnace smelting may include a liftable spiral spray gun 10, a lifting mechanism 20, a driving unit (not shown in fig. 1 b), a retractable swivel 30 and a gas-powder supply device (not shown in fig. 1 b).
As shown in fig. 1b and 2, the liftable spiral lance 10 may be composed of a spiral lance 11 and a refractory 12. The spiral nozzle 11 may be formed of a spiral metal pipe having a constant spiral angle and having a feed inlet (e.g., an upper end of the spiral nozzle 11 in fig. 2) and a discharge outlet (e.g., a lower end of the spiral nozzle 11 in fig. 2) formed at opposite ends thereof. The refractory material 12 can wrap the spiral nozzle 11, thereby prolonging the high temperature resistant melting loss time of the spiral nozzle 11. After the lower part of the spiral nozzle 11 is burnt, the blowing can be continued at the fracture, and the blowing angle in the Z-axis direction (i.e. the up-down direction in FIG. 1 b) is not changed, but the blowing point is changed in the circumferential direction. The liftable spiral spray gun belongs to a quick-wear part and can be conveniently and integrally replaced.
As shown in fig. 1b and 1c, the lifting mechanism may include a driving unit (not shown in fig. 1 b), a flange base 21, a long-toothed roller 22, a gear 23, and a driving screw pair 24 having a central tube penetrating therethrough.
The long-toothed drum 22 is provided on the flange base 21 in the up-down direction and is capable of forward rotation and reverse rotation. The flange base 21 can be arranged or supported on the water-cooled furnace cover. The gear 23 is fixedly sleeved on the transmission screw pair 24 and can be matched with the long-tooth roller 22, so that the transmission screw pair 24 ascends or descends in a rotating mode through meshing matching under the driving of forward rotation or reverse rotation of the long-tooth roller 22. The lower end of the central tube of the transmission screw pair 24 is communicated with the feed inlet of the spiral spray pipe 11. The driving unit is integrated in the long-toothed drum and is provided to be connected with the long-toothed drum so as to be able to control the long-toothed drum to rotate in a forward direction or a reverse direction. The driving unit may include a motor and a decelerator. Furthermore, the long-toothed drum, the gear and the drive unit can be jointly integrated into a servo-drum gear transmission. That is, the servo roller gear transmission mechanism can rotate the liftable spiral spray gun, so as to realize lifting and spiral of the liftable spiral spray gun, further control the spraying point in a specified direction, and drive the spiral spray gun to rotate in a whole circle or scan in a sector at a preset angular speed by the transmission spiral pair.
As shown in fig. 1b, 1c and 4, the drive screw pair 24 may include a nut 24a and a screw shaft 24 b. The center tube of the transmission screw pair 24 for passing the gas powder is arranged in the screw shaft 24b in a penetrating manner along the central axis direction. The nut 24a is fitted around the outer circumference of the screw shaft 24b in a screw-fitting manner. The nut 24a has an inert gas injection port 24c and an annular guide groove 24d communicating with each other. The inert gas supplied from the outside can be introduced into the conveying screw pair 24 through the inert gas injection port 24 c. Specifically, the inert gas may sequentially pass through the inert gas injection port 24c, the annular drainage groove 24d, and the screw fitting structure (corresponding to a labyrinth type mechanical sealing structure) of the nut and the screw shaft, so as to form a positive pressure or an internal gas release (such as a downward gas release in fig. 1 b) in the direction of the liftable screw lance (e.g., inside the electric furnace), thereby blocking harmful gas in the furnace, and further protecting the transmission screw pair, e.g., protecting the transmission screw pair from or less from corrosion by gas in the furnace. A small amount of seal gas (namely internal air leakage) entering the furnace does not react with the medium in the furnace, and the redundant gas in the furnace can be discharged and treated by a flue of the electric furnace.
In addition, a part of the inert gas may be discharged upward (upward discharge in fig. 1 b) in the direction opposite to the direction of the liftable spiral lance by sequentially passing through the inert gas injection port 24c, the annular drainage groove 24d, and a screw fitting structure (corresponding to a labyrinth mechanical seal structure) of the nut and the spiral shaft. That is, by providing the nut, the screw shaft, the inert gas injection port, and the annular drainage groove, a driving screw pair having a dynamic seal structure of a screw can be formed.
The retractable rotary joint 30 is provided to communicate the air powder supply device with the upper end of the center tube of the driving screw pair, and is capable of being extended or shortened (may be referred to as a retractable movement) by the ascending or descending of the driving screw pair. That is, the gas flow containing the particle powder generated by the gas powder supply device is sequentially fed into the electric furnace through the telescopic rotary joint 30, the transmission screw pair 24 and the spiral nozzle 11 of the liftable spiral spray gun 10 so as to uniformly spray powder and/or control slag in the molten pool.
As shown in fig. 1b and 3, the retractable swivel joint 30 may include: the device comprises a medium inlet connecting flange 31, a first self-lubricating sealing ring 32a, a second self-lubricating sealing ring 32b, a static end outer cylinder 33, a first-stage middle joint 34, a second-stage middle joint 35, a third-stage middle joint 36, a medium outlet connecting flange 37, a positive pressure gas inlet 38 and a mechanical labyrinth sealing element 39.
The medium inlet connection flange 31 (which may also be regarded as an inlet connection) has a lower end connected to the upper end of the stationary-end outer cylinder 33, and an upper end communicating with a gas powder supply device (not shown in fig. 3) to communicate the upper end of the stationary-end outer cylinder 33 with the gas powder supply device.
The multi-stage intermediate joint is composed of a first-stage intermediate joint 34 (which can be regarded as a first sleeve), a second-stage intermediate joint 35 (which can be regarded as a second sleeve), and a third-stage intermediate joint 36 (which can be regarded as a third sleeve) which are sleeved with each other through a spiral fit structure in sequence from outside to inside. The tertiary intermediate link 36 can be extended downward or retracted upward in the secondary intermediate link 35 to achieve a telescoping motion; the secondary intermediate link 35 can be extended downward or retracted upward in the primary intermediate link 34 to achieve a telescoping motion; the primary intermediate section 34 can be extended downward or retracted upward in the dead end outer cylinder 33 to achieve a telescopic movement. The upper ends of the first-stage intermediate joint 34, the second-stage intermediate joint 35 and the third-stage intermediate joint 36 together form a tapered opening M. In addition, the rotating sliding fit positions between two adjacent middle joints and between the first-stage middle joint and the static end outer cylinder can be filled with graphite, so that the self-lubricating performance of the bearing is further ensured.
The first self-lubricating seal ring 32a and a seal groove arranged on the outer circumference of the upper end of the primary intermediate joint 34 form a mutually matched seal assembly; and this seal assembly constitutes a seal between the primary intermediate joint 34 and the stationary-end outer cylinder 33 together with a mechanical labyrinth seal member 39 provided at the lower end of the stationary-end outer cylinder 33. The positive pressure gas inlet 38 is provided at the lower portion of the stationary end outer cylinder 33 and can communicate with a cavity formed by the inner wall of the stationary end outer cylinder 33 and the outer wall of the primary intermediate joint 34. The positive pressure gas access 38 can communicate the cavity with a gas source (e.g., an inert gas source) having a gas pressure higher than the gas pressure of the gas powder supply. The second self-lubricating sealing ring 32b and a sealing groove arranged on the outer circumference of the upper end of the secondary middle joint 35 form a mutually matched sealing assembly; and this seal assembly constitutes a seal between the primary intermediate joint 34 and the secondary intermediate joint 35 together with a mechanical labyrinth seal member provided at the lower end of the primary intermediate joint 34. Similarly, a seal assembly composed of a self-lubricating seal ring and a seal groove, which are mutually matched, and a seal structure formed by a mechanical labyrinth seal member may be respectively arranged between the second-stage intermediate joint 35 and the third-stage intermediate joint 36.
The medium outlet connection flange 37 (which may also be regarded as an outlet connection member) has an upper end portion fixedly connected to the lower end of the third-stage intermediate link 36, and a lower end portion communicating with the center pipe of the transmission rotary pair to communicate the third-stage intermediate link 36 with the center pipe of the transmission rotary pair.
When the retractable rotary joint 30 is used, positive pressure gas may be introduced into the positive pressure gas inlet 38 of the stationary-end outer cylinder 33 (for example, the gas pressure may be 0.4 MPa); subsequently, an inert gas flow (for example, a gas pressure of about 0.1MPa) containing graphite powder having a particle size of not more than about 100 mesh is introduced through the medium inlet connecting flange 31 and supplied from the medium outlet connecting flange 37 to the center pipe of the driving rotary pair.
In another exemplary embodiment of the present invention, the top-blown powder spraying integrated furnace cover system for electric furnace smelting may include an electric furnace cover (e.g., a water-cooled furnace cover) and one or more than two sets of top-blown powder spraying systems for electric furnace smelting as described above, which are uniformly arranged. The electric furnace cover is arranged to be sleeved outside each transmission rotating pair in one group or more than two groups of uniformly distributed top-blown powder spraying systems, and is positioned above each liftable spiral spray gun and below each flange base.
Fig. 5 shows a schematic top view of an electric furnace top-blown powder injection smelting process using an exemplary embodiment of the integrated top-blown powder injection furnace lid system of the present invention. As shown in fig. 5, an outer circle having the largest diameter represents a furnace wall of the electric furnace, an inner circle concentric with the outer circle represents an electrode area, four small circles represent areas corresponding to the spiral nozzles, and a black triangular area represents a blowing horizontal scanning area of the spiral nozzle on the right side. As shown in fig. 5, the top-blowing powder-spraying integrated furnace cover system comprises four groups of top-blowing powder-spraying systems. In addition, the four groups of top-blown powder spraying systems can share the same spray gun monitoring device and/or share the same control unit. That is, for a top-blow integrated cap system with more than two sets of top-blow powder spray systems, the top-blow powder spray integrated cap system also has only one common spray gun monitoring device and/or one common control unit. The spray gun monitoring device is arranged to detect the position or the blowing direction of the discharge hole of each spiral spray pipe in real time. For example, the lance monitoring device may be provided as an infrared video monitoring device that can look down at the blowing conditions (e.g., the location of the respective outlet ports or the blowing direction). The control unit is arranged to receive signals which are provided by the spray gun detection device and correspond to the positions of the discharge holes of the spiral spray pipes or the blowing directions, and controls the driving unit according to the signals to adjust the positions of the corresponding discharge holes or the blowing directions. In addition, the control unit may be arranged to be able to directly control the drive unit such that the driving screw pair drives the screw nozzle in a complete revolution or sector sweep at a predetermined angular velocity. The sector scanned area may be as shown by the black triangle in fig. 5. In addition, as shown in fig. 5, by uniformly arranging 4 top-blown powder spraying systems around the electrode, an operator can adjust the initial position of the spraying point according to actual conditions, and by means of manual or mechanical or program control, the action sequence, the curve track and the scanning area of each spraying point are preset, and complete rotation, or sector interval scanning or multi-gun cooperative scanning is performed. Namely, the top-blowing powder-spraying integrated furnace cover system can also be intelligently operated according to programs. That is to say, the array formed by a plurality of the top-blowing powder spraying systems is uniformly arranged on the furnace top, each blowing device can independently distribute powder to perform area scanning or whole-circle scanning, and can also realize the combined action and mutual cooperation of a plurality of blowing devices, so that manual or mechanical or programmed scanning is realized, the liquid reaction tank in the furnace is jointly driven to realize three-dimensional flow with a preset rule, and circumferential, radial and axial circulation currents are formed.
In addition, in any top-blowing powder-spraying system of the group or more than two groups of top-blowing powder-spraying systems which are uniformly distributed, the transmission screw pair can comprise a nut and a screw shaft. The spiral shaft is provided with a central pipe which is arranged along the central line in a penetrating way; the nut is arranged above the electric furnace cover and sleeved outside the spiral shaft in a spiral matching mode, and is provided with an inert gas injection port and an annular diversion trench which are communicated with each other.
To sum up, the utility model discloses a top-blown powder spraying system that electric stove was smelted and integrated bell system beneficial effect includes one or more in the following content:
(1) by arranging the liftable spiral spray gun with the spiral spray pipe with the constant spiral lift angle, the blowing angle can be kept unchanged after the gun head burns out any length; the refractory material wrapping the spray pipe is filled with gas, so that the service life of the spray pipe can be ensured; the burning loss length is compensated through lifting, and the service life of the spray gun is greatly prolonged;
(2) the spiral transmission pair with dynamic gas seal can effectively block the overflow of harmful gas in the furnace, and the gas seal does not participate in the reaction in the furnace, thereby being safe and environment-friendly;
(3) the lifting mechanism such as a servo roller is adopted as a transmission mechanism, the long-tooth roller and the gear rotate relatively to realize the lifting of the gear, the structure has the highest integration level, the occupied space is the smallest, the weight of the transmission device is light (for example, the weight of a top-blown powder spraying system for electric furnace smelting of the utility model can not exceed 500Kg), the bearing requirement on the furnace cover is the lowest, and the structure can be directly arranged at the top of the furnace cover without additionally arranging a supporting member outside the furnace;
(4) through the arrangement of the lifting mechanism, the telescopic rotary joint and the like, the top-blown powder spraying system for electric furnace smelting and the integrated furnace cover system thereof are particularly suitable for the situation that the installation space of the circuit furnace top is narrow (for example, the installation height of the upper surface of the furnace cover is at most 3m high); for example, the utility model discloses a top-blown powder spraying system that electric stove was smelted and the shared bell top's of integrated bell system mounting height can be not more than 2.8m to the jetting point of spiral spray tube can be adjustable 0 ~ 1.5m under the high-order slag surface in the stove.
(5) The multi-point powder spraying can be realized, each top-blowing powder spraying system can independently operate or operate in a linkage manner, the operation track of each powder spraying device can be preset according to the process requirements, the non-blind-area, uniform and programmed powder distribution is realized, the smelting effect is favorably improved, and the smelting yield is increased.
Although the present invention has been described above in connection with exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (9)
1. A top-blown powder spraying system for electric furnace smelting is characterized by comprising a liftable spiral spray gun, a lifting mechanism, a driving unit, a telescopic rotary joint and a gas powder supply device, wherein,
the liftable spiral spray gun comprises a spiral spray pipe and a refractory material, the spiral spray pipe is provided with a constant spiral angle, a feeding hole and a discharging hole, and the refractory material can wrap the spiral spray pipe;
the lifting mechanism comprises a driving unit, a flange base, a long-tooth roller, a gear and a transmission screw pair with a penetrating central tube, the long-tooth roller is arranged on the flange base, the gear is fixedly sleeved on the transmission screw pair and can be matched with the long-tooth roller so as to drive the transmission screw pair to rotatably ascend or descend, the lower end of the central tube of the transmission screw pair is communicated with the feed inlet of the spiral spray tube, and the driving unit is connected with the long-tooth roller and can control the forward rotation or the reverse rotation of the long-tooth roller;
the telescopic rotary joint is set to communicate the gas powder supply device with the upper end of the central tube of the transmission screw pair and can be driven by the transmission screw pair to perform telescopic motion.
2. The top-blown powder injection system for electric furnace smelting according to claim 1, wherein the helix angle is determined in the range of 15 to 45 °.
3. The top-blowing powder spraying system for electric furnace smelting according to claim 1, wherein the transmission screw pair comprises a nut and a screw shaft, the screw shaft is provided with the central pipe which penetrates through the screw shaft along a central line, the nut is sleeved outside the screw shaft in a screw fit mode, and the nut is provided with an inert gas injection port and an annular diversion trench which are communicated with each other.
4. The top-blowing powder spraying system for electric furnace smelting according to claim 1, further comprising a spray gun monitoring device, wherein the spray gun monitoring device is arranged to detect the position of the discharge hole of the spiral spray pipe or the spraying direction in real time.
5. The top-blowing powder spraying system for electric furnace smelting according to claim 4, further comprising a control unit, wherein the control unit is configured to receive a signal corresponding to the position of the discharge port of the spiral nozzle or the blowing direction provided by the spray gun monitoring device, and control the driving unit to adjust the position of the discharge port or the blowing direction according to the signal.
6. The top-blowing powder injection system for electric furnace smelting according to claim 1, wherein the telescopic swivel joint comprises an inlet connection, a stationary end outer barrel, a multi-stage intermediate joint, and an outlet connection, wherein,
the inlet connecting piece is provided with a lower end part connected with the upper end of the static end outer cylinder and an upper end part communicated with the gas powder supply device;
the multistage middle section is composed of two or more than three sleeved sleeves, any two of the two or more than three sleeves are arranged in the inner sleeve and the outer sleeve which are adjacent to each other, the inner sleeve can move in the outer sleeve in a telescopic mode, and the sleeve positioned on the outermost layer in the multistage middle section is sleeved in the outer sleeve at the static end and can move in the outer sleeve in a telescopic mode;
the outlet connecting piece is provided with an upper end part fixedly connected with the lower end of the sleeve of the innermost layer in the multi-stage middle section and a lower end part communicated with the upper end of the central pipe of the transmission screw pair.
7. The top-blowing powder injection system for electric furnace smelting according to claim 6, wherein the telescopic rotary joint further comprises a positive pressure gas inlet which is arranged at the lower part of the static end outer cylinder and can be communicated with a cavity formed by the static end outer cylinder and the outermost sleeve in the multi-stage middle joint, and the positive pressure gas inlet can be used for communicating the cavity with a gas source with the gas pressure higher than that of the gas powder supply device.
8. The top-blowing powder-spraying integrated furnace cover system for electric furnace smelting is characterized by comprising an electric furnace cover and one or more than two uniformly arranged top-blowing powder-spraying systems for electric furnace smelting according to any one of claims 1 to 2 and 4 to 7, wherein the electric furnace cover is arranged to be sleeved outside each transmission rotating pair in one or more than two uniformly arranged top-blowing powder-spraying systems, is positioned above each liftable spiral spray gun and is positioned below each flange base.
9. The integrated top-blowing powder-spraying furnace cover system for electric furnace smelting according to claim 8, wherein in any one top-blowing powder-spraying system of the one or more than two uniformly arranged top-blowing powder-spraying systems, the transmission screw pair comprises a nut and a screw shaft, the screw shaft is provided with the central pipe which penetrates through the screw shaft along a central line, the nut is arranged to be installed above the electric furnace cover and sleeved outside the screw shaft in a screw fit manner, and the nut is provided with an inert gas injection port and an annular flow guide groove which are communicated with each other.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020684613.2U CN213179464U (en) | 2020-04-29 | 2020-04-29 | Top-blown powder spraying system for electric furnace smelting and integrated furnace cover system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020684613.2U CN213179464U (en) | 2020-04-29 | 2020-04-29 | Top-blown powder spraying system for electric furnace smelting and integrated furnace cover system thereof |
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| CN213179464U true CN213179464U (en) | 2021-05-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115747416A (en) * | 2022-11-09 | 2023-03-07 | 山东钢铁股份有限公司 | Method for prolonging ladle age of ladle for LF refining |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115747416A (en) * | 2022-11-09 | 2023-03-07 | 山东钢铁股份有限公司 | Method for prolonging ladle age of ladle for LF refining |
| CN115747416B (en) * | 2022-11-09 | 2024-01-02 | 山东钢铁股份有限公司 | Method for improving ladle age for LF refining |
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