CN114393201B - Long-flow groove baking device and baking method for vacuum induction furnace - Google Patents
Long-flow groove baking device and baking method for vacuum induction furnace Download PDFInfo
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- CN114393201B CN114393201B CN202210014918.6A CN202210014918A CN114393201B CN 114393201 B CN114393201 B CN 114393201B CN 202210014918 A CN202210014918 A CN 202210014918A CN 114393201 B CN114393201 B CN 114393201B
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- 230000006698 induction Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000002893 slag Substances 0.000 claims abstract description 154
- 230000000630 rising effect Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 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 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
Classifications
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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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Furnace Details (AREA)
Abstract
The invention provides a long-flow groove baking device and a baking method for a vacuum induction furnace, wherein the baking device comprises a long-flow groove and a baking cover, a primary slag baffle and a secondary slag baffle which are arranged at intervals along the length direction of the long-flow groove are arranged in the long-flow groove, and the primary slag baffle and the secondary slag baffle are perpendicular to the length direction of the long-flow groove; the baking cover is located above the long flow groove, a first side air outlet and a second side air outlet are arranged in the baking cover, the first side air outlet is located above one side, far away from the second-stage slag baffle, of the first-stage slag baffle, the air flow path of the first side air outlet is at least partially intersected with the top end of the first-stage slag baffle, the second side air outlet is located above one side, far away from the first-stage slag baffle, of the second-stage slag baffle, and the air flow path of the second side air outlet is at least partially intersected with the top end of the second-stage slag baffle. The invention can solve the problem that one side of the primary slag baffle and the secondary slag baffle in the long launder, which are away from each other, is easy to become a baking dead angle, improves the baking uniformity and avoids the occurrence of baking cracks.
Description
Technical Field
The invention belongs to the technical field of smelting electric furnace control, and relates to a runner baking device for a vacuum induction furnace and a runner baking method for the vacuum induction furnace.
Background
The vacuum induction furnace is an important device for producing steel in modern times, and is especially used for producing steel with high alloying, easy segregation, difficult control of trace elements and trace impurities. The vacuum induction furnace is smelting equipment, in the pouring process, molten steel needs to flow through an intermediary device, called a launder, before entering an ingot mould, and the launder needs to be baked before use, so that molten steel is prevented from being easily solidified in the launder after being poured therein.
However, the current launders used in the industry, especially long and thin launders, often have uneven baking conditions during baking, which results in difficult control of baking temperature, poor temperature uniformity of each section of the launder, easy cracking of the launder surface after baking, and further shortened service life of the launder.
Disclosure of Invention
The invention aims to provide a runner baking device for a vacuum induction furnace and a runner baking method for the vacuum induction furnace, which solve the problem of uneven runner baking in the prior art.
In order to achieve one of the above objects, an embodiment of the present invention provides a long-flow chute baking apparatus for a vacuum induction furnace, comprising,
The long launder is provided with a primary slag baffle and a secondary slag baffle which are arranged at intervals along the length direction of the long launder, and the primary slag baffle and the secondary slag baffle are perpendicular to the length direction of the long launder;
The baking cover is positioned above the long launder, a first side air outlet and a second side air outlet are arranged in the baking cover, the first side air outlet is positioned above one side of the primary slag baffle, which is far away from the secondary slag baffle, the air flow path of the first side air outlet is at least partially intersected with the top end of the primary slag baffle, the second side air outlet is positioned above one side of the secondary slag baffle, which is far away from the primary slag baffle, and the air flow path of the second side air outlet is at least partially intersected with the top end of the secondary slag baffle;
And the pouring water gap is arranged in the long flow groove and is positioned at one side of the secondary slag baffle, which is away from the primary slag baffle.
As a further improvement of one embodiment of the invention, the top end of the primary slag baffle is provided with a first central line perpendicular to the length direction of the long launder, and the intersection point of the central axis of the air outlet at the first side part and the top end of the primary slag baffle is positioned at one side of the first central line far away from the secondary slag baffle in the length direction of the long launder.
As a further improvement of one embodiment of the invention, the ratio of the flow rate of the first side air outlet to the side of the primary slag trap facing away from the secondary slag trap to the flow rate of the first side air outlet to the side of the primary slag trap facing towards the secondary slag trap is 7:3-8:2.
As a further improvement of an embodiment of the present 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, an intersection point of the center axis of the second side air outlet and the top end of the secondary slag trap is located at a side of the second center line away from the secondary slag trap.
As a further improvement of one embodiment of the invention, the ratio of the flow rate of the second side air outlet to the side of the secondary slag trap facing away from the primary slag trap to the flow rate of the second side air outlet to the side of the secondary slag trap facing towards the primary slag trap is 6:4-7:3.
As a further improvement of an embodiment of the present invention, the baking 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 elongated slot, 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 baking cover is 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 flow groove.
As a further improvement of an embodiment of the present invention, the middle air outlet is located at the center of the long launder, 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 concentric double-layered pipes, and the cross-sectional area of the outer pipe of the double-layered pipe is 2 to 2.5 times that of the inner pipe thereof.
As a further improvement of an embodiment of the present invention, a first valve for adjusting the opening of the outer tube and a second valve for adjusting the opening of the inner tube are provided in the double tube.
As a further improvement of one embodiment of the present invention, a gap is provided 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, a fixing mechanism for supporting the roasting cover is further included, and the fixing mechanism is connected with the roasting cover.
In order to achieve one of the above objects, an embodiment of the present invention provides a baking method of a launder for a vacuum induction furnace, which adopts the launder baking apparatus for a vacuum induction furnace as described above to perform baking, the baking method comprising,
Controlling the temperature of the long launder to rise from room temperature to 1150-1200 ℃ at a heating speed of 500-600 ℃/h;
Preserving 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 flow groove;
Controlling the ratio of the gas flow rates 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 baking method of a launder for a vacuum induction furnace, which adopts the launder baking apparatus for a vacuum induction furnace as described above to perform baking, the baking method comprising,
The temperature of the long launder is controlled to rise from room temperature to 600-650 ℃ with the temperature rising speed of 100-150 ℃/h;
Preserving heat for 2-2.5 h;
controlling the temperature of the long launder to rise to 1150-1200 ℃ with the temperature rising speed of 250-300 ℃/h;
Preserving 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 side gas outlet and one-level slag trap, and second side gas outlet and second grade slag trap, can solve one side that one-level slag trap and second grade slag trap deviate from each other in the long chute and become the problem of toasting the dead angle easily to make each district of long chute toast evenly, in order to avoid appearing toasting the back long chute surface and appear the crackle easily, influence the life of long chute.
Drawings
FIG. 1 is a sectional view of a longflow cell baking apparatus for a vacuum induction furnace according to the present invention along a length direction of a longflow cell.
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 invention and structural, methodological, or functional modifications of these embodiments that may be made by one of ordinary skill in the art are included within the scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides a chute baking apparatus 100 for a vacuum induction furnace, including a chute 1 and a baking cover 2 for baking the chute 1. The long runner 1 here means a runner having a length of >3m, and the width of the entire runner is about 0.4m, and the longitudinal direction here is the flow direction of molten steel in the long runner 1.
The primary slag baffle 11 and the secondary slag baffle 12 are arranged in the long launder 1 at intervals along the length direction of the long launder, and are used for blocking slag to molten iron, the primary slag baffle 11 and the secondary slag baffle 12 are respectively perpendicular to the length direction of the long launder 1, and both extend to the whole width direction of the long launder 1, so that a better slag blocking effect is achieved.
The long launder 1 is also provided with a pouring water gap 13, the pouring water gap 13 is arranged on the bottom wall of the long launder 1 and is positioned on one side of the secondary slag baffle 12, which is away from the primary slag baffle 11, so that after molten iron is poured into the long launder 1, slag is blocked by the primary slag baffle 11 and the secondary slag baffle 12 in sequence, and then flows out of the long launder 1 from the pouring water gap 13.
For convenience of description, the length direction of the chute 1 in the present application is defined as the left-right direction, and the direction from the primary slag trap 11 toward the secondary slag trap 12 is defined as the right-left direction, and the direction from the baking cover 2 toward the chute 1 is defined as the top-down direction.
Looking at fig. 1, the roasting cover 2 is located above the elongated slot 1, a first side air outlet 21 and a second side air outlet 22 are provided in the roasting cover 2, the first side air outlet 21 is located above one side of the primary slag plate 11 away from the secondary slag plate 12, that is, the first side air outlet 21 is located above the right side of the primary slag plate 11, and the air flow path of the first side air outlet 21 intersects at least partially with the top end of the primary slag plate 11, so that the burnt air flow sprayed from the first side air outlet 21 is divided into two parts by the primary slag plate 11 when encountering the top end of the primary slag plate 11, flows to the left and right sides of the primary slag plate 11 respectively, and the burnt air flow on the right side is sprayed toward the bottom of the right side of the primary slag plate 11 under the reflection of the right surface of the primary slag plate 11, thereby enabling the bottom area of the elongated slot 1 located on the right side of the primary slag plate 11 to be fully roasted, and avoiding the area from becoming a roasting dead angle.
The second side air outlet 22 is located above one side of the secondary slag trap 12 away from the primary slag trap 11, that is, the second side air outlet 22 is located above the left side of the secondary slag trap 12, the air flow path of the second side air outlet 22 intersects at least partially with the top end of the secondary slag trap 12, so that the burnt air flow sprayed from the second side air outlet 22 is divided into two parts by the secondary slag trap 12 when encountering the top end of the secondary slag trap 12, flows to the left and right sides of the secondary slag trap 12 respectively, and the burnt air flow on the left side is sprayed toward the bottom of the long-flow groove 1 located on the left side of the secondary slag trap 12 under the reflection of the left surface of the secondary slag trap 12, thereby the bottom area of the long-flow groove 1 located on the left side of the secondary slag trap 12 is also sufficiently baked, and the area is prevented from becoming a baking dead angle.
Through the structure and the relative position setting of the first side air outlet 21 and the first-stage slag trap 11, and the second side air outlet 22 and the second-stage slag trap 12, the problem that one side of the first-stage slag trap 11 and the second-stage slag trap 12 in the long launder 1 deviating from each other easily becomes a baking dead angle can be solved, so that each section of the long launder 1 is baked uniformly, cracks are prevented from easily appearing on the surface of the long launder 1 after baking, and the service life of the long launder 1 is influenced.
Further, the top end of the primary slag trap 11 has a first center line perpendicular to the length direction of the launder 1, that is, the first center line extends in the width direction of the launder 1. In the length direction of the launder 1, the intersection point of the central axis of the first side air outlet 21 and the top end of the primary slag trap 11 is located on the side of the first central line away from the secondary slag trap 12, that is, the intersection point of the central axis of the first side air outlet 21 and the top end of the primary slag trap 11 is located on the right side of the first central line. In this way, the burnt gas sprayed out from the first side air outlet 21 flows to more parts on the right side of the primary slag trap 11, so that more burnt gas flows are sprayed to the bottom area of the long flow groove 1 on the right side of the primary slag trap 11 under the reflection of the right surface of the primary slag trap 11, thereby ensuring the baking effect of the long flow groove 1 on the bottom area of the right side of the primary slag trap 11, and enabling the temperature of the area to be as consistent as possible with other areas of the long flow groove 1.
Further, the top end of the secondary slag trap 12 has a second center line perpendicular to the length direction of the launder 1, that is, the second center line extends in the width direction of the launder 1. In the length direction of the launder 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 the 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. In this way, the burnt gas sprayed out from the second side air outlet 22 flows to more parts on the left side of the secondary slag trap 12, so that more burnt gas flows are sprayed to the bottom area of the long launder 1 on the left side of the secondary slag trap 12 under the reflection of the left surface of the secondary slag trap 12, thereby ensuring the baking effect of the long launder 1 on the bottom area of the left side of the secondary slag trap 12, enabling the temperature of the area to be consistent with that of other areas of the long launder 1 as much as possible, improving the temperature of the pouring nozzle 13, and avoiding the blockage of the pouring nozzle 13 due to solidification of molten iron at the pouring nozzle 13.
Further, the baking cover 2 includes a top wall 24, a first side wall 25 and a second side wall 26, 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 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 disposed on the first side wall 25, and the second side air outlet 22 is disposed on the second side wall 26. In this way, the design of the first side air outlet 21 and the second side air outlet 22 is convenient, and the distance from the first side air outlet 21 to the top end of the primary slag baffle 11 and the distance from the second side air outlet 22 to the top end of the secondary slag baffle 12 can be shortened, so that a better baking effect is achieved.
Further, the roast lid 2 is provided with a middle air outlet 23, and in the length direction of the launder 1, the middle air outlet 23 is located between the first side air outlet 21 and the second side air outlet 22, that is, the first side air outlet 21 and the second side air outlet 22 are located on the left and right sides of the middle air outlet 23, respectively. The long launder 1 between the primary slag trap 11 and the secondary 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, the middle air outlet 23 is located at the center of the long flow groove 1, and the middle air outlet 23 extends up and down, so that the burnt air flow sprayed out of the middle air outlet 23 can flow to the left and right sides after being sprayed to the bottom wall of the middle part of the long flow groove 1, and the temperature uniformity of the long flow groove 1 is further ensured.
Preferably, the ratio of the flow rate of the first side gas outlet 21 to the side of the primary slag trap 11 facing away from the secondary slag trap 12 to the flow rate of the first side gas outlet 11 to the side of the primary slag trap 11 facing toward the secondary slag trap 12 is 7:3 to 8:2, that is, the ratio of the gas flow rates blown from the first side gas outlet 21 to the right and left sides of the primary slag trap 11 is 7:3 to 8:2.
Preferably, the ratio of the flow rate of the second side gas outlet 22 to the side of the secondary slag trap 12 facing away from the primary slag trap 11 to the flow rate of the second side gas outlet 22 to the side of the secondary slag trap 12 facing toward the primary slag trap 11 is 6:4 to 7:3, that is, the ratio of the gas flow rates of the left and right sides of the secondary slag trap 12 blown from the second side gas outlet 22 is 6:4 to 7:3. And then the middle air outlet 23 is combined to bake the part of the long flow groove 1 between the primary slag baffle 11 and the secondary slag baffle 12, so that the temperature uniformity of the long flow groove 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 line, and supply the burned gas into the launder 1 through the externally connected gas line. Preferably, the first side gas outlet 21, the second side gas outlet 22 and the middle gas outlet 23 are integrally provided with the respective external gas lines, 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 concentric double-layered pipes, and the cross-sectional area of the outer pipe of the double-layered pipe is 2 to 2.5 times that of the inner pipe thereof. In practical application, the gas is introduced into the inner tube of the double-layer tube, and the air is introduced into the pipeline between the inner tube and the outer tube, so that the gas can be fully combusted.
Preferably, the ratio of the gas flows of the first side gas outlet 21, the second side gas outlet 22 and the middle gas outlet 23 is made to be 1.5: 3.5:5-2:3:5, thereby ensuring the uniform temperature of each section of the launder 1.
Further, a first valve for adjusting the opening of the outer tube and a second valve for adjusting the opening of the inner tube are provided in the double tube. The opening degree of the first valve and the opening degree of the second valve can be adjusted to adjust the gas flow and the air flow of each gas outlet, so that the gas flow and the air flow of each gas outlet can be adjusted in a targeted mode according to the requirements.
Further, a gap 3 is formed between the baking cover 2 and the long groove 1, the height of the gap 3 is 1-2 cm, flame of burning can be prevented from overflowing from the gap 3, baking efficiency is improved, air flow is smooth, burning is sufficient, and in addition, if air is excessive, the air can be discharged from the gap 3.
Specifically, the longflow cell baking apparatus 100 for a vacuum induction furnace further includes a fixing mechanism for supporting the baking cover 2, the fixing mechanism being connected to the baking cover 2 so that a gap 3 can be maintained between the baking cover 2 and the longflow cell 1. Accordingly, the chute baking apparatus 100 for a vacuum induction furnace further includes a base for supporting the chute 1.
An embodiment of the present invention also provides a baking method of a launder for a vacuum induction furnace, which is performed by using the launder baking apparatus 100 for a vacuum induction furnace as described above, the baking method comprising,
The temperature of the long flow groove 1 is controlled to rise from room temperature to 1150-1200 ℃ with the temperature rising speed of 500-600 ℃/h;
Preserving heat for 1.5-2 h.
Thus, by adopting the baking method and controlling the heating speed of the chute 1, the baking uniformity of the chute 1 can be achieved, and cracks and defects on the surface of the chute 1 in the baking process can be avoided. Of course, the method is suitable for the non-first-time used launder 1, and by the method, the temperature difference of each section of the launder 1 can be reduced from more than 100 ℃ to less than 30 ℃, the service life of the launder 1 can be prolonged, the heat of the launder 1 is prolonged to more than 8 times from 2-3 heats in the prior art, and the cost is greatly saved.
Preferably, the ratio of the gas flows 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 uniform temperature of each section of the launder 1.
In addition, for the launder 1 to be used for the first time, the following baking method may be adopted:
The temperature of the long flow groove 1 is controlled to rise from room temperature to 600-650 ℃ with the temperature rising speed of 100-150 ℃/h;
Preserving heat for 2-2.5 h;
Controlling the temperature of the long flow groove 1 to rise to 1150-1200 ℃ and the temperature rising speed to be 250-300 ℃/h;
Preserving heat for 1.5-2 h.
Through the heating up and the heat preservation of stage by stage, can preheat the protection to the chute 1 that uses for the first time, avoid chute 1 toast the too high time overlength of temperature and lead to its damage when using for the first time.
Preferably, the ratio of the gas flows 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 uniform temperature of each section of the launder 1.
Further description will be provided below in connection with specific examples.
Example 1
The length of the long launder 1 >4.5m and the width of the long launder 1 are 0.4m, which is described by taking the long launder 1 used in a vacuum induction furnace with the specification of 4.5t as an example.
Wherein the ratio of the flow rate of the first side air outlet 21 to the side of the primary slag trap 11 facing away from the secondary slag trap 12 to the flow rate of the first side air outlet 11 facing towards the secondary slag trap 12 is 7:3; the ratio of the flow rate of the second side air outlet 22 to the side of the secondary slag trap 12 facing away from the primary slag trap 11 to the flow rate of the second side air outlet 12 facing 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, in particular the ratio of the control gas flows is 2:3:5. wherein, the inner tube of double-deck pipe lets in coal gas, lets in the air between inner tube and the outer tube, and air flow is 1.3 times of coal gas flow.
After the first-time used launder 1 is baked, the temperature difference of each area of the launder 1 is less than or equal to 20 ℃, and the inner surface of the launder 1 has no crack and defect.
In the subsequent use process, the long flow groove 1 is baked again, the temperature difference of each area of the long flow groove 1 is less than or equal to 25 ℃ during each baking, and the inner surface of the long flow groove 1 has no cracks and defects.
The chute 1 can use 9 heats.
Example 2
The length of the long launder 1 used in the vacuum induction furnace with the specification of 4.5t is more than 4.5m, and the width is 0.4m.
Wherein the ratio of the flow rate of the first side air outlet 21 to the side of the primary slag trap 11 facing away from the secondary slag trap 12 to the flow rate of the first side air outlet 11 facing towards the secondary slag trap 12 is 7.5:2.5; the ratio of the flow rate of the second side air outlet 22 to the side of the secondary slag trap 12 facing away from the primary slag trap 11 to the flow rate of the side of the secondary slag trap 12 facing 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, in particular the ratio of the control gas flows is 2:3:5. wherein, the inner tube of double-deck pipe lets in coal gas, lets in the air between inner tube and the outer tube, and air flow is 1.5 times of coal gas flow.
After the first-time used launder 1 is baked, the temperature difference of each area of the launder 1 is less than or equal to 15 ℃, and the inner surface of the launder 1 has no crack and defect.
In the subsequent use process, the long flow groove 1 is baked again, the temperature difference of each area of the long flow groove 1 is less than or equal to 20 ℃ during each baking, and the inner surface of the long flow groove 1 has no cracks and defects.
The chute 1 can use 10 heats.
In summary, the long-flow-groove baking device 100 for vacuum induction furnaces and the baking method for the long flow groove for vacuum induction furnaces of the invention have the following beneficial effects: through the structure and the relative position setting of the first side air outlet 21 and the first-stage slag trap 11, and the second side air outlet 22 and the second-stage slag trap 12, the problem that one side of the first-stage slag trap 11 and the second-stage slag trap 12 in the long launder 1 deviating from each other easily becomes a baking dead angle can be solved, so that each section of the long launder 1 is baked uniformly, cracks are prevented from easily appearing on the surface of the long launder 1 after baking, and the service life of the long launder 1 is influenced.
It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (13)
1. A long-flow groove baking device for a vacuum induction furnace is characterized by comprising,
The long launder is provided with a primary slag baffle and a secondary slag baffle which are arranged at intervals along the length direction of the long launder, and the primary slag baffle and the secondary slag baffle are perpendicular to the length direction of the long launder;
The baking cover is positioned above the long launder, a first side air outlet and a second side air outlet are arranged in the baking cover, the first side air outlet is positioned above one side of the primary slag baffle, which is far away from the secondary slag baffle, the air flow path of the first side air outlet is at least partially intersected with the top end of the primary slag baffle, and the ratio of the flow rate of the first side air outlet to one side of the primary slag baffle, which is far away from the secondary slag baffle, to the flow rate of the first side air outlet to one side of the primary slag baffle, which is far towards the secondary slag baffle, is 7:3-8:2; the second side air outlet is positioned above one side, far away from the primary slag baffle, of the secondary slag baffle, the airflow path of the second side air outlet is at least partially intersected with the top end of the secondary slag baffle, and the ratio of the flow rate of the second side air outlet to one side, far away from the primary slag baffle, of the secondary slag baffle to the flow rate of the second side air outlet to one side, facing towards the primary slag baffle, of the secondary slag baffle is 6:4-7:3;
And the pouring water gap is arranged in the long flow groove and is positioned at one side of the secondary slag baffle, which is away from the primary slag baffle.
2. The apparatus according to claim 1, wherein the top end of the primary slag trap has a first center line perpendicular to the longitudinal direction of the elongated runner, and an intersection point of the center axis of the first side air outlet and the top end of the primary slag trap is located on a side of the first center line away from the secondary slag trap in the longitudinal direction of the elongated runner.
3. The apparatus according to claim 1, wherein the top end of the secondary slag trap has a second center line perpendicular to the longitudinal direction of the long launder, and an intersection point of the center axis of the second side air outlet and the top end of the secondary slag trap is located on a side of the second center line away from the secondary slag trap in the longitudinal direction of the long launder.
4. The apparatus according to claim 1, wherein the baking cover comprises 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 elongated slot, the first side wall and the second side wall extend away from each other gradually from top to bottom, the first side air outlet is formed in the first side wall, and the second side air outlet is formed in the second side wall.
5. The longflow groove baking apparatus for a vacuum induction furnace according to claim 1, wherein the baking 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 longflow groove.
6. The apparatus according to claim 5, wherein the central air outlet is located at the center of the chute, and the central air outlet extends vertically.
7. The apparatus according to claim 5, wherein the first side air outlet, the second side air outlet and the middle air outlet are all double pipes concentrically arranged, and the cross-sectional area of the outer pipe of the double pipes is 2 to 2.5 times that of the inner pipe thereof.
8. The launder baking apparatus for vacuum induction furnaces according to claim 7, wherein a first valve for adjusting the opening of the outer tube and a second valve for adjusting the opening of the inner tube are provided in the double tube.
9. The longflow groove baking apparatus for a vacuum induction furnace according to claim 1, wherein a gap is provided between the baking cover and the longflow groove, and the height of the gap is 1 to 2cm.
10. The longflow cell baking apparatus for a vacuum induction furnace according to claim 9, further comprising a fixing mechanism for supporting the baking cover, the fixing mechanism being connected to the baking cover.
11. A method for baking a chute for a vacuum induction furnace, characterized by using the chute baking device for a vacuum induction furnace according to any one of claims 1 to 10, comprising,
Controlling the temperature of the long launder to rise from room temperature to 1150-1200 ℃ at a heating speed of 500-600 ℃/h;
Preserving heat for 1.5-2 h.
12. The method of baking a chute for a vacuum induction furnace according to claim 11, wherein the baking cover is further provided with a middle air outlet located between the first side air outlet and the second side air outlet in the length direction of the chute;
Controlling the ratio of the gas flow rates 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.
13. A method for baking a chute for a vacuum induction furnace, characterized by using the chute baking device for a vacuum induction furnace according to any one of claims 1 to 10, comprising,
The temperature of the long launder is controlled to rise from room temperature to 600-650 ℃ with the temperature rising speed of 100-150 ℃/h;
Preserving heat for 2-2.5 h;
controlling the temperature of the long launder to rise to 1150-1200 ℃ with the temperature rising speed of 250-300 ℃/h;
Preserving heat for 1.5-2 h.
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