CN114393201A - Long launder baking device and baking method for vacuum induction furnace - Google Patents
Long launder baking device and baking method for vacuum induction furnace Download PDFInfo
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- CN114393201A CN114393201A CN202210014918.6A CN202210014918A CN114393201A CN 114393201 A CN114393201 A CN 114393201A CN 202210014918 A CN202210014918 A CN 202210014918A CN 114393201 A CN114393201 A CN 114393201A
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- 230000006698 induction Effects 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002893 slag Substances 0.000 claims abstract description 156
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 84
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000003034 coal gas Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000567 combustion gas Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D35/00—Equipment for conveying molten metal into beds or moulds
- B22D35/04—Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D35/00—Equipment for conveying molten metal into beds or moulds
- B22D35/06—Heating or cooling equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D46/00—Controlling, supervising, not restricted to casting covered by a single main group, e.g. for safety reasons
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Abstract
The invention provides a long runner baking device and a baking method for a vacuum induction furnace, wherein the baking device comprises a long runner and a baking cover, a primary slag trap and a secondary slag trap which are arranged at intervals along the length direction of the long runner are arranged in the long runner, and the primary slag trap and the secondary slag trap are both vertical to the length direction of the long runner; the baking cover is positioned above the long runner, a first side gas outlet and a second side gas outlet are arranged in the baking cover, the first side gas outlet is positioned above one side of the first-level slag trap far away from the second-level slag trap, the airflow path of the first side gas outlet is at least partially intersected with the top end of the first-level slag trap, the second side gas outlet is positioned above one side of the second-level slag trap far away from the first-level slag trap, and the airflow path of the second side gas outlet is at least partially intersected with the top end of the second-level slag trap. The invention can solve the problem that the side of the first-stage slag trap and the second-stage slag trap in the long launder, which deviates from each other, is easy to become a baking dead angle, improve the baking uniformity and avoid the baking cracks.
Description
Technical Field
The invention belongs to the technical field of smelting electric furnace control, and relates to a long launder baking device for a vacuum induction furnace and a baking method of a long launder for the vacuum induction furnace.
Background
The vacuum induction furnace is an important device for producing steel products at present, and is particularly used for producing high-alloying steel products which are easy to segregate, difficult to control trace elements and extremely trace inclusions. The vacuum induction furnace is a smelting device, and in the pouring process, molten steel flows through an intermediary device, namely a runner, before entering an ingot mold, and the runner needs to be baked before use so as to prevent the molten steel from being easily solidified in the runner after being poured into the runner.
However, in the prior art, the baking of the runner, especially the slender runner, is not uniform, which results in difficulty in controlling the baking temperature, poor temperature uniformity of each section of the runner, and easy cracking of the surface of the runner after baking, and thus shortens the service life of the runner.
Disclosure of Invention
The invention aims to provide a long launder baking device for a vacuum induction furnace and a baking method of a long launder for the vacuum induction furnace, and solve the problem of uneven baking of the long launder in the prior art.
In order to achieve one of the above objects, an embodiment of the present invention provides a long runner baking apparatus for a vacuum induction furnace, comprising,
the long launder is provided with a primary slag trap and a secondary slag trap which are arranged at intervals along the length direction of the long launder, and the primary slag trap and the secondary slag trap are both vertical to the length direction of the long launder;
the baking cover is positioned above the long runner, a first side gas outlet and a second side gas outlet are arranged in the baking cover, the first side gas outlet is positioned above one side, away from the secondary slag trap, of the primary slag trap, the gas flow path of the first side gas outlet is at least partially intersected with the top end of the primary slag trap, the second side gas outlet is positioned above one side, away from the primary slag trap, of the secondary slag trap, and the gas flow path of the second side gas outlet is at least partially intersected with the top end of the secondary slag trap;
and the pouring water gap is arranged in the long chute and is positioned at one side of the second-level slag trap deviating from the first-level slag trap.
As a further improvement of the embodiment of the present invention, the top end of the primary slag trap has a first central line perpendicular to the length direction of the long launder, and in the length direction of the long launder, an intersection point of a central axis of the first side gas outlet and the top end of the primary slag trap is located on a side of the first central line away from the secondary slag trap.
As a further improvement of an embodiment of the present invention, a ratio of a flow rate of the first side gas outlet flowing to a side of the primary slag trap facing away from the secondary slag trap to a flow rate of the first side gas outlet flowing to a side of the primary slag trap facing toward the secondary slag trap is 7:3 to 8: 2.
As a further improvement of the embodiment of the invention, the top end of the secondary slag trap has a second center line perpendicular to the length direction of the long launder, and in the length direction of the long launder, the intersection point of the central axis of the second side gas outlet and the top end of the secondary slag trap is located on the side of the second center line away from the secondary slag trap.
As a further improvement of an embodiment of the present invention, a ratio of a flow rate of the second side gas outlet flowing to a side of the secondary slag trap facing away from the primary slag trap to a flow rate of the secondary slag trap facing toward the primary slag trap is 6:4 to 7: 3.
As a further improvement of the embodiment of the present invention, the toasting cover includes a top wall, a first side wall and a second side wall, the first side wall and the second side wall are respectively connected to two ends of the top wall along the length direction of the long trough, the first side wall and the second side wall gradually extend away from each other from top to bottom, the first side air outlet is disposed on the first side wall, and the second side air outlet is disposed on the second side wall.
As a further improvement of an embodiment of the present invention, the roast cover is provided with a middle air outlet located between the first side air outlet and the second side air outlet in a length direction of the long chute.
As a further improvement of an embodiment of the present invention, the middle air outlet is located at the center of the long trough, and the middle air outlet extends up and down.
As a further improvement of an embodiment of the present invention, the first side air outlet, the second side air outlet, and the middle air outlet are all concentrically arranged double-layer pipes, and a cross-sectional area of an outer pipe of each double-layer pipe is 2 to 2.5 times a cross-sectional area of an inner pipe thereof.
As a further improvement of an embodiment of the present invention, the double tube is provided with a first valve for adjusting the opening degree of the outer tube and a second valve for adjusting the opening degree of the inner tube.
As a further improvement of one embodiment of the invention, a gap is arranged between the baking cover and the long launder, and the height of the gap is 1-2 cm.
As a further improvement of an embodiment of the present invention, the baking device further includes a fixing mechanism for supporting the baking cover, and the fixing mechanism is connected to the baking cover.
In order to achieve one of the above objects, an embodiment of the present invention provides a method for baking a long runner for a vacuum induction furnace, using the long runner baking apparatus for a vacuum induction furnace as described above, the method comprising,
controlling the temperature of the long launder to rise from room temperature to 1150-1200 ℃, wherein the temperature rise speed is 500-600 ℃/h;
and preserving the heat for 1.5-2 h.
As a further improvement of an embodiment of the present invention, the baking cover is further provided with a middle air outlet, and the middle air outlet is located between the first side air outlet and the second side air outlet in the length direction of the long runner;
controlling the ratio of the gas flow of the first side gas outlet, the second side gas outlet and the middle gas outlet to be 1.5: 3.5: 5-2: 3: 5.
in order to achieve one of the above objects, an embodiment of the present invention provides a method for baking a long runner for a vacuum induction furnace, using the long runner baking apparatus for a vacuum induction furnace as described above, the method comprising,
controlling the temperature of the long launder to rise from room temperature to 600-650 ℃, wherein the temperature rise speed is 100-150 ℃/h;
preserving the heat for 2-2.5 h;
controlling the temperature of the long launder to rise to 1150-1200 ℃, wherein the temperature rise speed is 250-300 ℃/h;
and preserving the heat for 1.5-2 h.
Compared with the prior art, the invention has the beneficial effects that: through the structure and the relative position setting of first lateral part gas outlet and one-level slag trap, and second lateral part gas outlet and second grade slag trap, can solve in the long launder one-level slag trap and second grade slag trap and deviate from one side each other and become the problem of toasting the dead angle easily to each district's section of messenger's long launder toasts evenly, in order to appear toasting the back long launder surface crack appears easily, influences the life in long launder.
Drawings
FIG. 1 is a sectional view of a long runner baking apparatus for a vacuum induction furnace according to the present invention, taken along the longitudinal direction of the long runner.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a long runner baking apparatus 100 for a vacuum induction furnace, including a long runner 1 and a baking cover 2 for baking the long runner 1. The long launder 1 here means a launder of length >3m, the width of the whole launder being about 0.4m, and the longitudinal direction here is also the direction of flow of the molten steel in the long launder 1.
Be equipped with in the long chute 1 along its length direction interval set up one-level slag trap 11 and second grade slag trap 12 for to the molten iron slag trap, one-level slag trap 11 and second grade slag trap 12 are perpendicular to the length direction of long chute 1 respectively, and the two all extends to the whole width direction of long chute 1, in order to have the slag trap effect of preferred.
Still be provided with the pouring mouth of a river 13 in the long chute 1, the diapire of long chute 1 is located to the pouring mouth of a river 13, and is located one side that second grade slag trap 12 deviates from one-level slag trap 11, like this, the molten iron pours into in the long chute 1 back, flows out long chute 1 from the pouring mouth of a river 13 behind one-level slag trap 11 and the slag trap 12 pushing off in proper order.
For convenience of description, the length direction of the long launder 1 in the present application is defined as the left-right direction, the direction from the first-stage slag trap 11 to the second-stage slag trap 12 is defined as the right-left direction, and the direction from the baking cover 2 to the long launder 1 is defined as the top-down direction.
Looking at fig. 1, the baking cover 2 is located above the long chute 1, the baking cover 2 is provided with a first side air outlet 21 and a second side air outlet 22, the first side air outlet 21 is located above one side of the first-stage slag trap 11 away from the second-stage slag trap 12, that is, the first side air outlet 21 is located above the right side of the first-stage slag trap 11, the air flow path of the first side air outlet 21 at least partially intersects with the top end of the first-stage slag trap 11, so that the burning air flow ejected from the first side air outlet 21 is divided into two parts by the first-stage slag trap 11 when encountering the top end of the first-stage slag trap 11, and the burning air flow on the right side flows to the left and right sides of the first-stage slag trap 11 respectively, and the burning air flow on the right side is ejected toward the bottom of the long chute 1 on the right side of the first-stage slag trap 11 under the reflection of the right surface of the first-stage slag trap 11, thereby fully baking the bottom area of the long chute 1 on the right side of the first-stage slag trap 11, this area is prevented from becoming a dead baking corner.
The second side air outlet 22 is located above one side of the second-stage slag trap 12 away from the first-stage slag trap 11, that is, the second side air outlet 22 is located above the left side of the second-stage slag trap 12, and the airflow path of the second side air outlet 22 is at least partially intersected with the top end of the second-stage slag trap 12, so that the combustion airflow ejected from the second side air outlet 22 is divided into two parts by the second-stage slag trap 12 when encountering the top end of the second-stage slag trap 12, and the two parts flow towards the left side and the right side of the second-stage slag trap 12 respectively, and the left combustion airflow is reflected by the left surface of the second-stage slag trap 12 and is ejected towards the left bottom of the long chute 1 located on the second-stage slag trap 12, so that the left bottom area of the long chute 1 located on the left side of the second-stage slag trap 12 is also fully baked, and the area is prevented from becoming a baking dead angle.
Through the structure and the relative position setting of first lateral part gas outlet 21 and one-level slag trap 11, and second lateral part gas outlet 22 and second grade slag trap 12, can solve in long chute 1 one-level slag trap 11 and second grade slag trap 12 and deviate from one side each other and become the problem of toasting the dead angle easily, thereby make each district section of long chute 1 toast evenly, in order to avoid appearing toasting the easy crackle that appears in long chute 1 surface, influence the life of long chute 1.
Further, the top end of the primary slag trap 11 has a first central line perpendicular to the length direction of the long launder 1, that is, the first central line extends in the width direction of the long launder 1. In the length direction of the long chute 1, the intersection point of the central axis of the first side gas outlet 21 and the top end of the first-level slag trap 11 is located on one side of the first central line far away from the second-level slag trap 12, that is, the intersection point of the central axis of the first side gas outlet 21 and the top end of the first-level slag trap 11 is located on the right side of the first central line. Like this, can make the gas flow direction of the gas flow of the gas of the spun burning of first side portion gas outlet 21 one-level slag trap 11 right side part more, and then make more combustion gas flows under the reflection of one-level slag trap 11 right surface, spray to the bottom region that long chute 1 is located one-level slag trap 11 right side to guarantee that long chute 1 is located the bottom region's on one-level slag trap 11 right side toasts the effect, make the temperature in this region and other regions of long chute 1 unanimous as far as possible.
Further, the top end of the secondary slag trap 12 has a second median perpendicular to the length direction of the long launder 1, i.e. the second median extends in the width direction of the long launder 1. In the length direction of the long chute 1, the intersection point of the central axis of the second side air outlet 22 and the top end of the secondary slag trap 12 is located on one side of the second central line away from the secondary slag trap 12, that is, the intersection point of the central axis of the second side air outlet 22 and the top end of the secondary slag trap 12 is located on the left side of the second central line. Like this, can make the gas flow direction of the gas flow of second side gas outlet 22 spun burning to the left part of second grade slag trap 12 more, and then make more combustion gas flows under the reflection of second grade slag trap 12 left surface, it is located the left bottom region of second grade slag trap 12 to spray to long chute 1, thereby guarantee that long chute 1 is located the baking effect of the left bottom region of second grade slag trap 12, make the temperature in this region and other regions of long chute 1 unanimous as far as possible, improve the temperature of pouring nozzle 13, avoid the molten iron to solidify at pouring nozzle 13 and make pouring nozzle 13 block up.
Further, the toasting cover 2 comprises a top wall 24, a first side wall 25 and a second side wall 26, wherein the first side wall 25 and the second side wall 26 are respectively connected to two ends of the top wall 24 along the length direction of the long chute 1, the first side wall 25 and the second side wall 26 gradually extend away from each other from top to bottom, the first side air outlet 21 is formed in the first side wall 25, and the second side air outlet 22 is formed in the second side wall 26. Therefore, the design of the first side air outlet 21 and the second side air outlet 22 is not only convenient, but also the distance from the first side air outlet 21 to the top end of the first-level slag trap 11 can be shortened, and the distance from the second side air outlet 22 to the top end of the second-level slag trap 12 can be shortened, so that a better baking effect is achieved.
Further, the baking cover 2 is provided with a middle air outlet 23, and the middle air outlet 23 is located between the first side air outlet 21 and the second side air outlet 22 in the length direction of the long chute 1, that is, the first side air outlet 21 and the second side air outlet 22 are respectively located at the left side and the right side of the middle air outlet 23. The long launder 1 between the first-stage slag trap 11 and the second-stage slag trap 12 is baked through the middle air outlet 23, so that the temperature of each section of the long launder 1 is uniform.
Further, middle part gas outlet 23 is located the center of long chute 1, and middle part gas outlet 23 extends from top to bottom to can make the air current of the burning of middle part gas outlet 23 spout and flow to the left and right sides behind the diapire at long chute 1 middle part, further guarantee the temperature homogeneity of long chute 1.
Preferably, the ratio of the flow rate of the gas flowing from the first side gas outlet 21 to the side of the first-stage slag trap 11 away from the second-stage slag trap 12 to the flow rate of the gas flowing from the first side gas outlet 21 to the side of the first-stage slag trap 11 toward the second-stage slag trap 12 is 7:3 to 8:2, that is, the ratio of the gas flowing from the first side gas outlet 21 to the right side and the left side of the first-stage slag trap 11 is 7:3 to 8: 2.
Preferably, the ratio of the flow rate of the gas flowing from the second side gas outlet 22 to the side of the secondary slag trap 12 away from the primary slag trap 11 to the flow rate of the gas flowing to the side of the secondary slag trap 12 toward the primary slag trap 11 is 6:4 to 7:3, that is, the ratio of the gas flowing from the second side gas outlet 22 to the left side and the right side of the secondary slag trap 12 is 6:4 to 7: 3. And the middle air outlet 23 is combined to bake the part of the long launder 1 between the first-stage slag trap 11 and the second-stage slag trap 12, so that the temperature uniformity of the long launder 1 can be ensured.
In the present embodiment, the first side gas outlet 21, the second side gas outlet 22 and the middle gas outlet 23 are externally connected to a gas pipeline, and the combustion gas is supplied to the elongated flow channel 1 through the externally connected gas pipeline. Preferably, the first side air outlet 21, the second side air outlet 22 and the middle air outlet 23 are integrally formed with respective external gas pipelines, so that gas leakage can be avoided.
Further, the first side air outlet 21, the second side air outlet 22 and the middle air outlet 23 are all concentrically arranged double-layer pipes, and the sectional area of the outer pipe of each double-layer pipe is 2-2.5 times that of the inner pipe of each double-layer pipe. In practical application, the inner pipe of the double-layer pipe is filled with gas, and the pipeline between the inner pipe and the outer pipe is filled with air, so that the gas can be fully combusted.
Preferably, the gas flow rate ratio of the first side gas outlet 21, the second side gas outlet 22 and the middle gas outlet 23 is set to be 1.5: 3.5: 5-2: 3:5, thereby ensuring the temperature of each section of the long launder 1 to be uniform.
Furthermore, a first valve for adjusting the opening degree of the outer pipe and a second valve for adjusting the opening degree of the inner pipe are arranged in the double-layer pipe. By adjusting the opening degrees of the first valve and the second valve, the gas flow rate and the air flow rate of each air outlet can be adjusted, and the adjustment can be performed in a targeted manner as required.
Further, toast and have clearance 3 between lid 2 and the long chute 1, clearance 3 highly be 1 ~ 2cm, not only can avoid the flame of burning to spill over from clearance 3, improve and toast efficiency, can make the air current unobstructed moreover, the burning is abundant, in addition, if the air is too much can also discharge from clearance 3.
Specifically, the long runner baking device 100 for the vacuum induction furnace further comprises a fixing mechanism for supporting the baking cover 2, and the fixing mechanism is connected with the baking cover 2, so that a gap 3 can be maintained between the baking cover 2 and the long runner 1. Accordingly, the long runner baking apparatus 100 for a vacuum induction furnace further includes a base for supporting the long runner 1.
An embodiment of the present invention further provides a baking method of a long runner for a vacuum induction furnace, which performs baking using the long runner baking apparatus 100 for a vacuum induction furnace as described above, the baking method including,
controlling the temperature of the long launder 1 to rise from room temperature to 1150-1200 ℃, wherein the temperature rise speed is 500-600 ℃/h;
and preserving the heat for 1.5-2 h.
Thus, by adopting the baking method and controlling the temperature rise speed of the long launder 1, the baking uniformity of the long launder 1 can be achieved, and cracks and defects on the surface of the long launder 1 in the baking process can be avoided. Certainly, the method is suitable for the long launder 1 which is not used for the first time, the temperature difference of each section of the long launder 1 can be reduced to be within 30 ℃ from more than 100 ℃ by the method, the service life of the long launder 1 can be prolonged to be more than 8 times from 2-3 times in the prior art, and the cost is greatly saved.
Preferably, the ratio of the gas flow rates of the first side gas outlet 21, the second side gas outlet 22 and the middle gas outlet 23 is controlled to be 1.5: 3.5: 5-2: 3:5, thereby ensuring the temperature of each section of the long launder 1 to be uniform.
In addition, for the long launder 1 used for the first time, the following baking method may be adopted:
controlling the temperature of the long launder 1 to rise from room temperature to 600-650 ℃, wherein the temperature rise speed is 100-150 ℃/h;
preserving the heat for 2-2.5 h;
controlling the temperature of the long launder 1 to rise to 1150-1200 ℃, wherein the temperature rise speed is 250-300 ℃/h;
and preserving the heat for 1.5-2 h.
Through heating up and heat preservation stage by stage, can preheat the protection to long chute 1 for the first time of using, avoid long chute 1 toasts the temperature overlength and leads to its damage when using for the first time.
Preferably, the ratio of the gas flow rates of the first side gas outlet 21, the second side gas outlet 22 and the middle gas outlet 23 is controlled to be 1.5: 3.5: 5-2: 3:5, thereby ensuring the temperature of each section of the long launder 1 to be uniform.
The following description is further described with reference to specific examples.
Example 1
The long launder 1 used in a 4.5t standard vacuum induction furnace is taken as an example for explanation, and the long launder 1 has a length of >4.5m and a width of 0.4 m.
Wherein, the ratio of the flow of the first side gas outlet 21 flowing to the side of the first-stage slag trap 11 departing from the second-stage slag trap 12 to the flow of the first-stage slag trap 11 facing the second-stage slag trap 12 is 7: 3; the ratio of the flow rate of the second side gas outlet 22 flowing to the side of the secondary slag trap 12 away from the primary slag trap 11 to the flow rate of the second side gas outlet flowing to the side of the secondary slag trap 12 toward the primary slag trap 11 is 7: 3.
The ratio of the gas flow rates of the first side gas outlet 21, the second side gas outlet 22 and the middle gas outlet 23 is 2:3:5, especially controlling the ratio of the gas flow to be 2:3: 5. wherein, the inner tube of the double-layer tube is communicated with coal gas, air is communicated between the inner tube and the outer tube, and the air flow is 1.3 times of the coal gas flow.
After the long launder 1 used for the first time is baked, the temperature difference of each area of the long launder 1 is less than or equal to 20 ℃, and the inner surface of the long launder 1 has no cracks or defects.
In the subsequent use process, the long launder 1 is baked again, the temperature difference of each area of the long launder 1 is less than or equal to 25 ℃ during each baking, and the inner surface of the long launder 1 has no cracks or defects.
The long launder 1 can be used for 9 heats.
Example 2
A long runner 1 used for a vacuum induction furnace with the specification of 4.5t is adopted, the length of the long runner 1 is more than 4.5m, and the width is 0.4 m.
Wherein, the ratio of the flow of the first side gas outlet 21 flowing to the side of the first-stage slag trap 11 departing from the second-stage slag trap 12 to the flow of the first-stage slag trap 11 flowing to the side of the second-stage slag trap 12 is 7.5: 2.5; the ratio of the flow rate of the second side gas outlet 22 flowing to the side of the secondary slag trap 12 away from the primary slag trap 11 to the flow rate of the second side gas outlet flowing to the side of the secondary slag trap 12 toward the primary slag trap 11 is 6.5: 3.5.
The ratio of the gas flow rates of the first side gas outlet 21, the second side gas outlet 22 and the middle gas outlet 23 is 1.5: 3.5:5, especially controlling the ratio of the gas flow to be 2:3: 5. wherein, the inner tube of the double-layer tube is communicated with coal gas, air is communicated between the inner tube and the outer tube, and the air flow is 1.5 times of the coal gas flow.
After the long launder 1 used for the first time is baked, the temperature difference of each area of the long launder 1 is less than or equal to 15 ℃, and the inner surface of the long launder 1 has no cracks or defects.
In the subsequent use process, the long launder 1 is baked again, the temperature difference of each area of the long launder 1 is less than or equal to 20 ℃ during each baking, and the inner surface of the long launder 1 has no cracks or defects.
The long launder 1 can be used for 10 heats.
In summary, the long launder baking apparatus 100 for a vacuum induction furnace and the baking method of the long launder for the vacuum induction furnace according to the present invention have the following beneficial effects: through the structure and the relative position setting of first lateral part gas outlet 21 and one-level slag trap 11, and second lateral part gas outlet 22 and second grade slag trap 12, can solve in long chute 1 one-level slag trap 11 and second grade slag trap 12 and deviate from one side each other and become the problem of toasting the dead angle easily, thereby make each district section of long chute 1 toast evenly, in order to avoid appearing toasting the easy crackle that appears in long chute 1 surface, influence the life of long chute 1.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (15)
1. A long runner baking device for a vacuum induction furnace is characterized by comprising,
the long launder is provided with a primary slag trap and a secondary slag trap which are arranged at intervals along the length direction of the long launder, and the primary slag trap and the secondary slag trap are both vertical to the length direction of the long launder;
the baking cover is positioned above the long runner, a first side gas outlet and a second side gas outlet are arranged in the baking cover, the first side gas outlet is positioned above one side, away from the secondary slag trap, of the primary slag trap, the gas flow path of the first side gas outlet is at least partially intersected with the top end of the primary slag trap, the second side gas outlet is positioned above one side, away from the primary slag trap, of the secondary slag trap, and the gas flow path of the second side gas outlet is at least partially intersected with the top end of the secondary slag trap;
and the pouring water gap is arranged in the long chute and is positioned at one side of the second-level slag trap deviating from the first-level slag trap.
2. The long runner baking apparatus for a vacuum induction furnace as claimed in claim 1, wherein the top end of the primary slag trap has a first center line perpendicular to the length direction of the long runner, and the intersection of the central axis of the first side gas outlet and the top end of the primary slag trap in the length direction of the long runner is located on the side of the first center line away from the secondary slag trap.
3. The long runner baking device for the vacuum induction furnace as claimed in claim 2, wherein the ratio of the flow rate of the first side gas outlet to the side of the primary slag trap facing away from the secondary slag trap to the flow rate of the first side gas outlet to the side of the primary slag trap facing towards the secondary slag trap is 7:3 to 8: 2.
4. The long runner baking apparatus for a vacuum induction furnace according to claim 1, wherein the top end of the secondary slag trap has a second center line perpendicular to the length direction of the long runner, and the intersection of the central axis of the second side gas outlet and the top end of the secondary slag trap in the length direction of the long runner is located on the side of the second center line away from the secondary slag trap.
5. The long runner baking device for the vacuum induction furnace as claimed in claim 4, wherein the ratio of the flow rate of the second side gas outlet to the side of the secondary slag trap facing away from the primary slag trap to the flow rate of the second side gas outlet to the side of the secondary slag trap facing the primary slag trap is 6:4 to 7: 3.
6. The long runner baking apparatus for a vacuum induction furnace as claimed in claim 1, wherein said baking cover includes a top wall, a first side wall and a second side wall, said first side wall and said second side wall are connected to both ends of said top wall along the length direction of said long runner, respectively, and said first side wall and said second side wall extend gradually away from each other from top to bottom, said first side air outlet is provided in said first side wall, and said second side air outlet is provided in said second side wall.
7. The long runner baking apparatus for a vacuum induction furnace as claimed in claim 1, wherein the baking cover is provided with a middle air outlet between the first side air outlet and the second side air outlet in a length direction of the long runner.
8. The long runner baking apparatus for a vacuum induction furnace of claim 7, wherein the middle air outlet is located at the center of the long runner, and the middle air outlet extends upward and downward.
9. The long runner baking device for the vacuum induction furnace as claimed in claim 7, wherein the first side air outlet, the second side air outlet and the middle air outlet are all concentrically arranged double-layer pipes, and the cross-sectional area of the outer pipe of the double-layer pipe is 2-2.5 times that of the inner pipe thereof.
10. The long runner baking apparatus for a vacuum induction furnace as claimed in claim 9, wherein a first valve for adjusting the opening degree of the outer pipe and a second valve for adjusting the opening degree of the inner pipe are provided in the double pipe.
11. The long runner baking apparatus for a vacuum induction furnace as claimed in claim 1, wherein a gap is provided between the baking cover and the long runner, and the height of the gap is 1 to 2 cm.
12. The long runner baking apparatus for a vacuum induction furnace of claim 10, further comprising a fixing mechanism for supporting said baking cover, said fixing mechanism being connected to said baking cover.
13. A method for baking a long launder for a vacuum induction furnace, characterized by using the long launder baking apparatus for a vacuum induction furnace according to any one of claims 1 to 10, the baking method comprising,
controlling the temperature of the long launder to rise from room temperature to 1150-1200 ℃, wherein the temperature rise speed is 500-600 ℃/h;
and preserving the heat for 1.5-2 h.
14. The roasting method of the long launder for vacuum induction furnace according to claim 13, characterized in that the roasting cover is further provided with a middle air outlet, the middle air outlet being located between the first side air outlet and the second side air outlet in the length direction of the long launder;
controlling the ratio of the gas flow of the first side gas outlet, the second side gas outlet and the middle gas outlet to be 1.5: 3.5: 5-2: 3: 5.
15. a method for baking a long launder for a vacuum induction furnace, characterized by using the long launder baking apparatus for a vacuum induction furnace according to any one of claims 1 to 10, the baking method comprising,
controlling the temperature of the long launder to rise from room temperature to 600-650 ℃, wherein the temperature rise speed is 100-150 ℃/h;
preserving the heat for 2-2.5 h;
controlling the temperature of the long launder to rise to 1150-1200 ℃, wherein the temperature rise speed is 250-300 ℃/h;
and preserving the heat for 1.5-2 h.
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| CN202210014918.6A CN114393201A (en) | 2022-01-07 | 2022-01-07 | Long launder baking device and baking method for vacuum induction furnace |
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| CN202210014918.6A CN114393201A (en) | 2022-01-07 | 2022-01-07 | Long launder baking device and baking method for vacuum induction furnace |
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