CN105256102A - Blowing and stirring integrated type molten iron pretreatment desulphurization device and method - Google Patents
Blowing and stirring integrated type molten iron pretreatment desulphurization device and method Download PDFInfo
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Abstract
The invention discloses a blowing and stirring integrated type molten iron pretreatment desulphurization device and method. A powder-gas conveying pipe at the lower ends of weighing hoppers is in flexible connection with a powder spraying gun. The lower end of a fixed sleeve which is arranged outside the powder spraying gun in a sleeving mode is connected with a hollow transmission shaft through a bearing sleeve. A driven gear in which the bearing sleeve is embedded is engaged with a driving gear connected with a motor. A powder spraying pipe located at the lower end of the transmission shaft is buried in a stirring blade provided with a powder spraying channel. The stirring blade is inserted into a molten iron ladle cover. The method comprises the steps that the molten iron ladle cover is descended to the position above the edge of a molten iron ladle, the stirring blade enters the ladle cover to start a blowing system, and after the stirring blade conducts blowing in molten iron for 10-20 s, a stirring system is started for desulphurization; blowing and stirring are conducted for 8-20 min, and if the sulphur content in the molten iron reaches the standard, slagging-off operation is conducted; otherwise, desulphurization continues to be conducted till converting requirements are met; and the motor stops operating after the desulphurization, the blowing system is ascended, and blowing is stopped when the lower end of the stirring blade is flush with the edge of the molten iron ladle. According to the device and method, compared with a blowing method, the desulfurization rate is increased, and the consumption amount per ton of desulfurizing agents is reduced; compared with a KR stirring method, the temperature drop of the molten iron is reduced, and the service life of a stirring head is prolonged.
Description
Technical field
The invention belongs to the front molten iron pretreatment desulfurizing field of steel-making, particularly relate to a kind of winding-up, stir combined type molten iron pretreatment desulfurizing device and method.
Background technology
The relative steel desulfurization of molten iron pretreatment desulfurizing technique or refining desulfuration more simply, are reduce one of the effective way that ironmaking, steel-smelting technology economic target are born, simplify the operation and improved in ironmaking and steel making working procedure desulfurization.West Europe and Japan and other countries from the later stage seventies, just by Liquid Iron Pretreatment Technology for the production of, obtain widespread use to the eighties in developed country.Nineteen ninety-five is as can be seen from the regulation of the countries such as Japan, the U.S. to sulphur content in steel, the sulphur content of ordinary steel is all below 0.015%, structure iron is below 0.011%, sulphur content is not more than the ratio of 0.005% also close to 30%, is not difficult to find out that Japan waits iron and steel power hot metal pretreatment level of application widely.The steel mills such as China's Baosteel, Wuhan Iron and Steel Plant, Taiyuan Iron and Steel Co. have just introduced Liquid Iron Pretreatment Technology in the seventies later stage, each big steel factory in whole nation the late nineteen eighties successively by Liquid Iron Pretreatment Technology for the production of, successively have elder brother's steel, Ji steel etc. built up hot metal pretreatment engineering.
At present, the molten iron pretreatment desulfurizing technology be widely used can be divided into paddling process and blowing process two kinds of techniques.From aerodynamic point, blowing process is compared with mechanical mixing method, and dynamic conditions is poor, easily returns sulphur, and sorbent utilization is low, and for deactivating magnesium powder of jetting, world's highest record is not also more than 50%, and domestic preferably about 40%.Magnesium powder utilization ratio is low closely related with magnesium steam bubble floating interval of floating dock in molten iron of its formation.And floating interval of floating dock and bubble floating path-dependent, for blowing process, bubble floating path is exactly that lance outlet is surperficial to hot metal ladle, can think that floating path is exactly a line.Poor stability, and the aspect such as the security of the transport of sweetening agent and storage and running cost is all lower than mechanical mixing method.Hot metal temperature drop angle, the rapid stirring of paddling process can cause hot metal temperature drop to strengthen, higher to the temperature requirement of molten iron.In addition, the work-ing life of stirring-head is also a problem needing consideration, and in recent years along with the development of resistance to material, the life problems of stirring-head can be resolved.At present, what the hot metal pretreatment of external large iron and steel enterprise mainly adopted is mechanical mixing method, and what domestic large and medium-sized enterprise generally adopted is blowing process.As a whole, the development of molten iron pretreatment desulfurizing technique is mainly carried out round two aspects: one side makes great efforts to reduce desulphurization cost, from reduction sweetening agent unit consumption, adopts cheap composite desulfurizing agent, minimizing iron loss, raising sulfur removal technology and Automated water equality to start with; Be the target desulfurization level ensureing dark desulfurization on the other hand, adopt the sulfur removal technology that dynamic conditions is good, the generation of anti-non-return sulphur.
Summary of the invention
The present invention is directed to the deficiency existed in existing molten iron desulfurizing method, a kind of winding-up is provided, stirs combined type molten iron pretreatment desulfurizing device and method, its objective is on the basis of reducing hot metal temperature drop and sorbent consumption, realize the high efficiency of desulfuration efficiency, and reduce desulfurizing iron cost.
For this reason, the technical solution that the present invention takes is:
Combined type molten iron pretreatment desulfurizing device is stirred in a kind of winding-up, comprises feeding system, jacking system and molten iron Sheng and send system, it is characterized in that, set up injection system, stirring system and molten iron clad, injection system comprises powder monitor, fixed sleeving, powder letter shoot and hose connector, stirring system comprises motor, driving toothed gear, follower gear, bearing housing, transmission shaft, flange and powder spraying stirring device, the scale hooper top of feeding system is provided with nitrogen and helps blowpipe, lower end discharge port is connected on powder letter shoot, powder letter shoot one end is connected with nitrogen pipeline, the other end connects powder monitor tail end by hose connector, the outer surface cover of powder monitor has fixed sleeving, fixed sleeving is fixed on lift cart, fixed sleeving lower end is provided with Hollow Transmission Shafts, be connected by bearing housing between transmission shaft with fixed sleeving, powder monitor lower end is passed from bearing housing center and is stretched on transmission shaft top, bearing housing is embedded in follower gear, follower gear engages with the driving toothed gear being connected motor, motor is fixed on lift cart, transmission shaft lower end is by Flange joint powder spraying stirring device upper end, powder spraying stirring device bottom is inserted in molten iron clad centre hole, hot metal ladle covers and is provided with cleaning shaft.
Described powder spraying stirring device is made up of dischage tube, protective sleeve and stirring rake; stirring rake entirety is in the four rib truncateds cone; stirring rake center is provided with the passage that dusts; the dischage tube that passage and bottom be embedded in refractory materials stirring rake that dusts interlinks; dust passage lower end be provided with 2 fall " V " shape distribution squit hole; outside dischage tube, be enclosed with one section of refractory materials protective sleeve, dischage tube upper end is with flange.
Sealing-ring is provided with between described powder monitor and bearing housing.
Refractory mortar gasket is provided with between described transmission shaft flange and dischage tube flange.
Described nitrogen helps blowpipe pressure P 1 to be 0.2 ~ 0.6MPa, and powder letter shoot pressure P 2 is 0.3 ~ 0.8MPa, and ensures P2 >=P1.
Combined type molten iron pretreatment desulfurizing method is stirred in a kind of winding-up, and its concrete grammar and step are:
1, start injection system and stir rotating machine, jetting pressure is set to maximum value 0.8MPa, and stirring rake speed of rotation is set to 100r/min, checks whether flange connections leaks gas, if gas leakage, needs to change gasket and guarantees that flange connections is air tight.
2, entering into behind winding-up position until hot metal ladle, fall molten iron clad, in order to reduce the damage of hot metal ladle vibration to molten iron clad internal refractories in sweetening process, between molten iron clad inwall and molten iron handbag edge, leaving the gap of 50 ~ 80mm.
3, after injection system being transformed into winding-up position from preparation position, powder monitor declines with the speed of 10 ~ 15m/min, after powder spraying stirring device front portion enters molten iron clad, injection system starts, enter into molten iron inside when powder spraying stirring device lower end stirring rake and after the 10 ~ 20s that jets, automatically start stirring system; Sweetening process, according to the initial sulphur content of molten iron, target sulphur content and molten iron temperature setting injection parameter and mixing parametric.
4, after winding-up stir process 8 ~ 20min, carry out thermometric sampling, if the sulphur content of molten iron has reached the requirement of target sulphur, then can carry out taking off slag operation; If the sulphur content of molten iron is greater than target sulphur content, then to carry out secondary desulfuration operation until meet convert stove requirement.
5, the sulphur content of molten iron meets and converts after stove requires, stopping electric machine rotation, starts afterwards to promote injection system, stopping when stirring rake lower end rises to molten iron handbag along jetting when maintaining an equal level; Get back to behind preparation position until injection system, then molten iron clad is risen.
6, start the hydraulic dumping device on hot metal ladle chassis, hot metal ladle is tumbled after 10 ~ 35 ° and carry out operation of skimming, skim after terminating and hot metal ladle is resetted, namely complete molten iron pretreatment desulfurizing and operate.
Described sweetening process, according to the injection parameter of the initial sulphur content of molten iron, target sulphur content and molten iron temperature setting and mixing parametric is:
Beneficial effect of the present invention is:
The present invention is according to the defect of blowing desulfurization and stirring desulphurization two kinds of methods, propose stirring, winding-up compound Desulfuring Device of Hot Metal and method, namely on the basis of original stirring desulphurization technology, additional injection technology, the deficiency of benefit blowing process and paddling process is made up, and its advantage is played.Apparatus of the present invention structure is simple, reasonable in design, easy to operate, can obtain following beneficial effect by these apparatus and method:
1) comparatively Desulfurization by injecting method rate improves;
2) comparatively KR paddling process reduces hot metal temperature drop;
3) comparatively blowing process reduces iron melt desulfurizing agent ton consumption;
4) comparatively KR paddling process improves stirring-head work-ing life.
Accompanying drawing explanation
Fig. 1 is that combined type molten iron pretreatment desulfurizing apparatus structure schematic diagram is stirred in winding-up;
Fig. 2 blows agitator structure sectional view;
Fig. 3 is stirring rake stereographic map.
In figure: feed bin 1, nitrogen helps blowpipe 2, scale hooper 3, turning valve 4, powder letter shoot 5, follower gear 6, cleaning shaft 7, molten iron clad 8, hydraulic dumping device 9, hose connector 10, dust gun breech 11, powder monitor 12, fixed sleeving 13, lift cart 14, motor 15, bearing housing 16, driving toothed gear 17, transmission shaft 18, transmission shaft flange 19, protective sleeve 20, stirring rake 21, hot metal ladle 22, hot metal ladle chassis 23, dischage tube flange 24, dischage tube 25, stiffening web 26, squit hole 27, dust passage 28, stir rib 29.
Embodiment
As seen from Figure 1, the present invention jets, and to stir combined type molten iron pretreatment desulfurizing device be contain at original feeding system, jacking system and molten iron to send on the basis of system, set up again injection system, stirring system and molten iron clad 8.Feeding system comprises feed bin 1 and scale hooper 3.Jacking system comprises lift cart 14 and track.Molten iron is contained and is sent system to comprise hydraulic dumping device 9, hot metal ladle 22 and hot metal ladle chassis 23.
Injection system comprises transmission shaft 18 and the dischage tube 25 of powder letter shoot 5, hose connector 10, powder monitor 12, fixed sleeving 13 and stirring system and a powder spraying stirring device part.Stirring system comprises follower gear 6, motor 15, bearing housing 16, driving toothed gear 17, transmission shaft 18, transmission shaft flange 19 and powder spraying stirring device.
The top of feeding system scale hooper 3 is provided with nitrogen and helps blowpipe 2, lower end discharge port is connected in the middle of powder letter shoot 5 by turning valve 4, nitrogen helps the pressure P 1 of blowpipe 2 to be 0.2 ~ 0.6MPa, and the pressure P 2 of powder letter shoot 5 is 0.3 ~ 0.8MPa, and need ensure P2 >=P1.One end of powder letter shoot 5 is connected with nitrogen pipeline, the other end connects one section of hose connector 10, the descending operation of powder monitor 12 can be facilitated, the other end of hose connector 10 is sealedly connected on and dusts on gun breech 11, the outer surface cover of powder monitor 12 has fixed sleeving 13, and fixed sleeving 13 is fixed on lift cart 14; Fixed sleeving 13 lower end is provided with transmission shaft 18, and transmission shaft 18 is one section of open tube, is connected between transmission shaft 18 with fixed sleeving 13 by bearing housing 16; The lower end of powder monitor 12 is stretched on the top of Hollow Transmission Shafts 18 after passing from the center of bearing housing 16, and is provided with sealing-ring between powder monitor 12 and bearing housing 16.Bearing housing 16 is embedded in the axis hole of follower gear 6, and follower gear 6 engages with driving toothed gear 17, and driving toothed gear 17 connects motor 15, and motor 15 is fixed on lift cart 14; Transmission shaft 18 lower end is connected on the dischage tube flange 24 of powder spraying stirring device dischage tube 25 upper end by transmission shaft flange 19, is provided with refractory mortar gasket between transmission shaft flange 19 and dischage tube flange 24.Powder spraying stirring device bottom is inserted in the centre hole of molten iron clad 8, molten iron clad 8 is provided with cleaning shaft 7.
Fig. 2 shows; powder spraying stirring device system is made up of dischage tube 25, protective sleeve 20 and stirring rake 21; stirring rake 21 is the four rib truncateds cone that the trapezoidal side's rib arranged by 4 crosses is formed; stirring rake 21 center is provided with the passage 28 that dusts; the dischage tube 25 that passage 28 and bottom be embedded in refractory materials stirring rake 21 that dusts interlinks; the dust lower end of passage 28 is provided with 2 squit holes 27 falling the distribution of " V " shape; outside dischage tube 25, be enclosed with one section of refractory materials protective sleeve 20, dischage tube 25 upper end is with dischage tube flange 24.In order to strengthen stirring rake 21 and the strength of joint of dischage tube 25, be welded with 6 stiffening webs 26 in the periphery of dischage tube 25, and in aggregates with the refractory material casting of stirring rake 21.
For Anshan iron and steel plant factory, what desulfurizing iron adopted is compound powder injection process, sweetening agent is lime powder and passive metal magnesium powder, jet in the ratio of 4:1, the average treatment capacity of every tank molten iron is 245 tons, powder monitor 12 low side is 300mm apart from the distance at the bag end, to overflow molten iron to prevent splash, molten iron level wraps the distance controlling on edge at 300 ~ 400mm apart from hot metal ladle 22, nebulizer gas pressure 1.2MPa, injecting velocity lime 45kg/min, magnesium powder 15kg/min, sorbent consumption amount lime 352kg, magnesium powder 88kg, the utilization ratio of its magnesium powder is 46.9%, before process, the medial temperature of molten iron is at 1350 DEG C, after process, the temperature-averaging of molten iron is at 1320 DEG C, temperature drop is 30 DEG C, average treatment cycle 38min.The distance that injection hole 27 wraps the end apart from hot metal ladle 22 is 240mm, molten iron level is apart from wrapping the distance controlling on edge at 400mm, injection hole 27 carrier gas of dusting is that nitrogen pressure set is at 0.8 ~ 1.0MPa, sweetening agent adopts single lime or lime and magnesium powder compound powder, injecting velocity calcium oxide 40 ~ 50kg/min, magnesium powder 10 ~ 15kg/min.The speed of rotation of stirring-head is 80 ~ 100r/min, in order to prevent splash and reduce hot metal temperature drop, is furnished with insulation clad 8.Every tank can average treatment iron water amount be 250 tons, carries out the process of different mode depending on molten iron temperature situation.
The jet detailed process that stirs combined type molten iron pretreatment desulfurizing method and step of the present invention is:
1, start injection system and stir rotating machine 15, jetting pressure is set to maximum value 0.8MPa, and stirring rake 21 speed of rotation is 100r/min, checks whether flange connections leaks gas, if gas leakage, needs to change gasket and guarantees that flange connections is air tight.
2, enter into behind winding-up position until hot metal ladle 22, falling molten iron clad 8, vibrating the damage to molten iron clad 8 internal refractories to reduce hot metal ladle 22 in sweetening process, molten iron clad 8 inwall and hot metal ladle 22 wrap the gap leaving 50 ~ 80mm between edge.
3, with the lowering speed of 10 ~ 15m/min, injection system is transformed into winding-up position from preparation position, after powder spraying stirring device front portion enters molten iron clad 8, injection system starts, and enters into molten iron inside and after the 10 ~ 20s that jets, automatically start stirring system when powder spraying stirring device lower end stirring rake 21; Sweetening process, sets injection parameter and mixing parametric according to the initial sulphur content of molten iron, target sulphur content and molten iron temperature.
When temperature before molten iron process is higher than 1350 DEG C: the lime powder that sweetening agent adopts winding-up single, injecting velocity 50kg/min, jetting pressure is set in 1.0MPa, and the speed of rotation of stirring-head is 100r/min.
When temperature before molten iron process higher than 1300 DEG C lower than 1350 DEG C: sweetening agent adopts the single lime powder of winding-up or lime and magnesium powder compound powder, injecting velocity lime 45kg/min, magnesium powder 10kg/min, jetting pressure is set in 0.8MPa, and the speed of rotation of stirring-head is 90r/min.
When temperature before molten iron process is lower than 1300 DEG C: sweetening agent adopts winding-up lime and magnesium powder compound powder, and injecting velocity lime 40kg/min, magnesium powder 15kg/min, jetting pressure is set in 0.9MPa, and the speed of rotation of stirring-head is 80r/min.
4, after winding-up stir process 8 ~ 20min, carry out thermometric sampling, if the sulphur content of molten iron has reached the requirement of target sulphur, then can carry out taking off slag operation; If the sulphur content of molten iron is greater than target sulphur content, then to carry out secondary desulfuration operation until meet convert stove requirement.
5, the sulphur content of molten iron meets and converts after stove requires, stops motor 15 to rotate, starts afterwards to promote injection system, stops along jetting time fair when stirring rake 21 lower end rises to wrap with hot metal ladle 22; Get back to behind preparation position until injection system, then molten iron clad 8 is risen.
6, start the hydraulic dumping device 9 on hot metal ladle chassis 23, hot metal ladle 22 is tumbled after 10 ~ 35 ° and carry out operation of skimming, skim after terminating and hot metal ladle 22 is resetted, namely complete molten iron pretreatment desulfurizing and operate.
Implement the present invention, the utilising efficiency of sweetening agent can be improved, under calcium oxide and magnesium powder composite blowing situation, the utilization ratio of magnesium powder can bring up to 50%, hot metal temperature drop maintains existing winding-up level or lower, and average treatment cycle time, to 35min, realizes the object of low-cost high-efficiency desulfurization.
Claims (7)
1. a combined type molten iron pretreatment desulfurizing device is stirred in winding-up, comprises feeding system, jacking system and molten iron Sheng and send system, it is characterized in that, set up injection system, stirring system and molten iron clad, injection system comprises powder monitor, fixed sleeving, powder letter shoot and hose connector, stirring system comprises motor, driving toothed gear, follower gear, bearing housing, transmission shaft, flange and powder spraying stirring device, the scale hooper top of feeding system is provided with nitrogen and helps blowpipe, lower end discharge port is connected on powder letter shoot, powder letter shoot one end is connected with nitrogen pipeline, the other end connects powder monitor tail end by hose connector, the outer surface cover of powder monitor has fixed sleeving, fixed sleeving is fixed on lift cart, fixed sleeving lower end is provided with Hollow Transmission Shafts, be connected by bearing housing between transmission shaft with fixed sleeving, powder monitor lower end is passed from bearing housing center and is stretched on transmission shaft top, bearing housing is embedded in follower gear, follower gear engages with the driving toothed gear being connected motor, motor is fixed on lift cart, transmission shaft lower end is by Flange joint powder spraying stirring device upper end, powder spraying stirring device bottom is inserted in molten iron clad centre hole, hot metal ladle covers and is provided with cleaning shaft.
2. combined type molten iron pretreatment desulfurizing device is stirred in winding-up according to claim 1; it is characterized in that; described powder spraying stirring device is made up of dischage tube, protective sleeve and stirring rake; stirring rake entirety is in the four rib truncateds cone; stirring rake center is provided with the passage that dusts; the dischage tube that passage and bottom be embedded in refractory materials stirring rake that dusts interlinks; dust passage lower end be provided with 2 fall " V " shape distribution squit hole; outside dischage tube, be enclosed with one section of refractory materials protective sleeve, dischage tube upper end is with flange.
3. combined type molten iron pretreatment desulfurizing device is stirred in winding-up according to claim 1, it is characterized in that, is provided with sealing-ring between described powder monitor and bearing housing.
4. combined type molten iron pretreatment desulfurizing device is stirred in winding-up according to claim 1, it is characterized in that, is provided with refractory mortar gasket between described transmission shaft flange and dischage tube flange.
5. combined type molten iron pretreatment desulfurizing device is stirred in winding-up according to claim 1, and it is characterized in that, described nitrogen helps blowpipe pressure P 1 to be 0.2 ~ 0.6MPa, and powder letter shoot pressure P 2 is 0.3 ~ 0.8MPa, and ensures P2 >=P1.
6. a method for combined type molten iron pretreatment desulfurizing device is stirred in winding-up as claimed in claim 1, and it is characterized in that, concrete grammar and step are:
(1) start injection system and stir rotating machine, jetting pressure is set to maximum value 0.8MPa, and stirring rake speed of rotation is set to 100r/min, checks whether flange connections leaks gas, if gas leakage, needs to change gasket and guarantees that flange connections is air tight;
(2) entering into behind winding-up position until hot metal ladle, fall molten iron clad, in order to reduce the damage of hot metal ladle vibration to molten iron clad internal refractories in sweetening process, between molten iron clad inwall and molten iron handbag edge, leaving the gap of 50 ~ 80mm;
(3) after injection system being transformed into winding-up position from preparation position, powder monitor declines with the speed of 10 ~ 15m/min, after powder spraying stirring device front portion enters molten iron clad, injection system starts, enter into molten iron inside when powder spraying stirring device lower end stirring rake and after the 10 ~ 20s that jets, automatically start stirring system; Sweetening process, according to the initial sulphur content of molten iron, target sulphur content and molten iron temperature setting injection parameter and mixing parametric;
(4) after winding-up stir process 8 ~ 20min, carry out thermometric sampling, if the sulphur content of molten iron has reached the requirement of target sulphur, then can carry out taking off slag operation; If the sulphur content of molten iron is greater than target sulphur content, then to carry out secondary desulfuration operation until meet convert stove requirement;
(5) sulphur content of molten iron meets and converts after stove requires, stopping electric machine rotation, starts afterwards to promote injection system, stopping when stirring rake lower end rises to molten iron handbag along jetting when maintaining an equal level; Get back to behind preparation position until injection system, then molten iron clad is risen;
(6) start the hydraulic dumping device on hot metal ladle chassis, hot metal ladle is tumbled after 10 ~ 35 ° and carry out operation of skimming, skim after terminating and hot metal ladle is resetted, namely complete molten iron pretreatment desulfurizing and operate.
7. the method for combined type molten iron pretreatment desulfurizing device is stirred in winding-up according to claim 6, it is characterized in that, described sweetening process, according to the injection parameter of the initial sulphur content of molten iron, target sulphur content and molten iron temperature setting and mixing parametric is:
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