CN209923383U - Slab induction heating device - Google Patents
Slab induction heating device Download PDFInfo
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- CN209923383U CN209923383U CN201920509701.6U CN201920509701U CN209923383U CN 209923383 U CN209923383 U CN 209923383U CN 201920509701 U CN201920509701 U CN 201920509701U CN 209923383 U CN209923383 U CN 209923383U
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Abstract
A slab induction heating device and a method belong to the field of heating equipment. The heating device comprises a plurality of groups of electromagnetic induction heaters and a supporting platform, wherein each electromagnetic induction heater comprises a steel through hole, an electromagnetic induction coil, a magnetic flux concentrator, a heat insulation layer and a packaging box of an insulation layer. The electromagnetic induction coil is formed by continuously winding a hollow rectangular copper pipe according to a U shape and an inverted U shape, and meanwhile, the longitudinal current directions of the electromagnetic induction coil arranged on the upper surface and the lower surface are the same, so that transverse magnetic flux induction heating and longitudinal magnetic flux induction heating can be simultaneously realized on the plate blank. The supporting platform is used for fixing the electromagnetic induction heater, and the supporting platform is vertically moved through the external lifting device according to the different thicknesses of the plate blank, so that the center of the steel through hole and the center of the plate blank are positioned on the same horizontal line, and the centering of the plate blank is guaranteed. The utility model discloses the device can realize horizontal magnetic flux induction heating and vertical magnetic flux induction heating to the base simultaneously, and the heating is even and efficient, and the energy saving has reduced the exhaust emission that adopts heating such as coal gas to cause, and easy to assemble and operation take up an area of fewly, the small investment.
Description
Technical Field
The utility model belongs to the firing equipment field, in particular to slab induction heating device.
Background
Induction heating is a heating method in which electric energy is converted into magnetic energy, and the heated steel body is heated by inducing the magnetic energy. The principle is that alternating current generated by an induction heating power supply generates an alternating magnetic field through an inductor (namely an induction coil), a magnetic conductive object is arranged in the inductor to cut alternating magnetic lines, so that alternating current (namely eddy current) is generated in the object, the eddy current enables atoms in the object to move randomly at a high speed, and the atoms collide and rub with each other to generate heat energy, thereby achieving the effect of heating the object. The electromagnetic induction heating has the advantages of high efficiency, energy conservation, rapid heating, reliable operation, cost reduction and the like, and is widely applied to the fields of metallurgy, machining, light chemical industry and the like.
At present, two induction heating modes are mainly available in the market, one is longitudinal magnetic flux induction heating, and the other is transverse magnetic flux induction heating. The longitudinal magnetic flux induction heating is that an electromagnetic induction coil surrounds a magnetic conductive object to form an eddy current flowing along the outer wall of the cross section of the object, and the current density of each point on the eddy current is equal to realize uniform heating. In order to ensure the heating efficiency and avoid the influence of the skin effect, the ratio of the thickness of the plate blank to the penetration depth is required to be more than or equal to 3, which causes very high power supply frequency, large electromagnetic loss and increased radiation risk. Because the width-thickness ratio of the plate blank (including continuous casting blank, intermediate blank and plate strip steel) is large and the temperatures of four edges and adjacent areas are low in the heating process, the temperature difference between the center and the edge of the heated plate strip steel is large and can reach more than 50 ℃, and the distribution uniformity of the surface temperature is poor; meanwhile, the longitudinal magnetic flux induction heating is not provided with the function of adjusting the up-down position at present, so that the temperature difference of the upper part and the lower part of the plate blank with different thicknesses can reach more than 40 ℃, the final cross section is in a sandwich type structure, and the forming performance is influenced, so the longitudinal magnetic flux induction heating is more suitable for small square blanks, round tubes, bars and the like with fixed sizes. The induction coil for transverse magnetic flux induction heating does not surround the slab, the magnetic wire vertically penetrates through the upper surface and the lower surface of the slab, eddy current flows on the surface of the slab, a lower frequency can be used, and the corner and the edge part thereof are not uniformly heated under the influence of edge effect. In contrast, some researchers have optimized the shape of the transverse induction coil, developed improved and novel induction coils, but still cannot completely eliminate the uneven temperature of the plate surface and have low thermal efficiency under the influence of the proximity effect; meanwhile, the side surface can not be heated, the temperature in the thickness direction is uneven and can reach more than 30 ℃ due to the influence of skin effect, and a corner induction heater and the like are required to be adopted for heat supplement. The non-uniformity of the slab temperature, which results in differences in deformation resistance, differences in structure, and differences in width during the subsequent rolling or forming process, seriously affects the internal quality, formability, and shape and dimension accuracy of the slab.
The two induction heating modes have own characteristics, but have defects, particularly the problems of non-uniformity of temperature distribution, low heating efficiency and the like, and simultaneously, the equipment and the control are more complicated and the portability is poor in order to better utilize or solve the skin effect, the edge effect, the circular ring effect and the proximity effect of the electromagnetic induction heating. Therefore, various national scholars, researchers and the industry continuously strive and explore to find a more reasonable induction heating device, so that the purposes of uniform heating, cost reduction, efficiency improvement, process and equipment simplification, easy transplantation and the like are achieved, the application of the induction heating device in various industries is promoted, a traditional tunnel type heating furnace or a conventional electric heating furnace and the like are replaced, and the effects of energy conservation and emission reduction are achieved.
Disclosure of Invention
The utility model aims to solve the problems of uneven heating of the workpiece, expensive power supply cost, large heat energy loss, low heating efficiency, poor portability and the like existing in the conventional induction heating device and method.
A slab induction heating device is characterized in that: comprises a plurality of groups of electromagnetic induction heaters and a supporting platform; the supporting platform is used for fixing the electromagnetic induction heater, and the upper position and the lower position of the slab induction heating device are moved through the external lifting device, so that the center of the steel through hole of the electromagnetic induction heater and the center of the slab are positioned on the same horizontal line.
Further, the plate blank comprises a continuous casting blank, an intermediate blank and a plate strip steel.
Furthermore, the electromagnetic induction heater comprises a steel through hole, an electromagnetic induction coil, a magnetic flux concentrator, a heat insulation layer and a packaging box of the insulation layer; the power of the electromagnetic induction heater is 0.5-5 MW. The steel through holes are surrounded by the electromagnetic induction coil, and the uniform heating of the plate blank is realized by utilizing the electromagnetic induction; the magnetic flux concentrator is arranged at the periphery of the electromagnetic induction coil far away from the plate blank, and plays a role in preventing magnetic force lines from overflowing; the heat-insulating layer is wrapped on the periphery of the magnetic flux concentrator to play a role in preventing heat from dissipating; the insulating layer is arranged on the outermost layer and plays roles of heat insulation, radiation insulation, insulation and protection. The integral multi-layer packaging mode is convenient for manufacturing, hoisting, installing and the like of the electromagnetic induction heater.
Furthermore, the electromagnetic induction coil is formed by continuously winding a hollow rectangular copper pipe according to a U shape and an inverted U shape, and meanwhile, the longitudinal current directions of the electromagnetic induction coils arranged on the upper surface and the lower surface are the same, so that transverse magnetic flux induction heating and longitudinal magnetic flux induction heating can be simultaneously realized on the plate blank; the device is externally connected with a variable frequency alternating current power supply and a water-cooling distributor.
Furthermore, the steel through holes are rectangular holes, the steel through holes are used for accommodating the slabs to pass through and are parallel to the motion direction of the slabs, the hole height is more than 5mm higher than the thickest slab, and the hole width is more than 10mm wider than the widest slab.
The electromagnetic induction coil is formed by continuously winding a hollow rectangular copper pipe according to a U shape and an inverted U shape, and the heating efficiency is improved by utilizing a circular ring effect; the variable frequency alternating current power supply and the water-cooling distributor are externally connected, water cooling is carried out in the hollow rectangular copper pipe, heat generated by the electromagnetic induction coil is taken away, the copper pipe can be prevented from being heated and expanded, conductivity rising caused by temperature rise can be prevented, and the service life and the heat utilization efficiency of the electromagnetic inductor are improved; the electromagnetic induction coils are continuously and parallelly arranged in the width direction according to the U shape and the inverted U shape, the current directions of the adjacent coils are always opposite, the transverse magnetic flux induction heating is carried out on the plate surface by utilizing the proximity effect, the heating efficiency is improved, the U-shaped long edge is consistent with the movement direction of the plate blank, the uneven corner heating caused by the edge effect of the U-shaped bottom in the traditional vertical arrangement is avoided, and the uniformity of the plate surface temperature is ensured; meanwhile, the electromagnetic induction coil is arranged around the steel through hole, so that the four sides of the plate blank are heated. In addition, the electromagnetic induction coils arranged on the upper surface and the lower surface have the same current direction, and longitudinal magnetic flux induction heating is carried out in the thickness direction of the plate blank, so that the heating efficiency and the uniformity of the temperature of the cross section of the plate blank are improved. The magnetic flux concentrator aims to reduce magnetic resistance, increase eddy current power, reduce the edge effect and proximity effect of an electromagnetic induction coil, improve the density of magnetic lines of force through a gap effect and improve the heat efficiency, can select silicon steel sheets, iron-cobalt-nickel soft magnetic alloy, non-metal ferrite soft magnetic materials and the like, can adopt the silicon steel sheets under lower frequency generally, and can adopt high-frequency magnetizer materials such as the iron-cobalt-nickel soft magnetic alloy and the like when the frequency is higher. The heat-insulating layer plays a role in heat insulation, prevents heat loss and improves heat utilization efficiency, and low-temperature light castable, medium-temperature phosphate castable, high-temperature bauxite cement castable or high-temperature low-cement castable can be selected according to heating temperature. The insulating layer has heat insulating, radiation insulating and insulating effects, and can be made of heat insulating materials such as synthetic rubber, radiation-proof materials such as steel, and insulating materials such as ceramics. The power of the electromagnetic induction heater is 0.5-5MW, the temperature of the plate blank in unit area can be improved to be less than or equal to 60 ℃, the temperature difference of the plate surface is ensured to be less than or equal to 2 ℃, the temperature difference of the thickness is ensured to be less than or equal to 1 ℃, and the heat utilization efficiency is more than or equal to 90%. When a plurality of groups of electromagnetic induction heaters are adopted, a freely combined mode can be adopted, such as a uniform heating mode, a front section heating and rear section heat preservation mode, an intermittent heating mode and the like, and thermocouple thermometers can be arranged in front of and behind the electromagnetic induction heaters, so that the online monitoring of the temperature and the real-time adjustment of the heating power are realized, and the heating temperature is ensured.
The utility model provides a slab induction heating device's electromagnetic induction coil wiring mode adopts hollow rectangle copper pipe to form according to the continuous coiling of U-shaped and the shape of falling, be different from traditional one-way vertical magnetic flux induction heating and one-way horizontal magnetic flux induction heating, it can realize horizontal magnetic flux induction heating and vertical magnetic flux induction heating simultaneously, carry out horizontal magnetic flux induction heating above and below the slab on the one hand, on the other hand carries out vertical magnetic flux induction heating in the thickness direction, electromagnetic induction coil encircles the slab simultaneously, realize even heating all around, it is more even to make the slab heating, it is quick and efficient, the proximity effect has been avoided, the temperature difference that causes such as edge effect, slab internal quality has been guaranteed, formability and shape size precision.
The utility model discloses well main technology's effect and mechanism:
the electromagnetic induction coil is adopted to continuously and parallelly arrange the wires according to the U shape and the inverted U shape by adopting the hollow rectangular copper tube, and the transverse magnetic flux induction heating is carried out on the board surface by utilizing the proximity effect, so that the heating efficiency is improved, the uneven corner heating caused by the edge effect of the traditional vertical wiring is avoided, and the uniformity of the board surface temperature is ensured; the four sides of the plate blank are heated by using a surrounding wiring mode, the longitudinal current directions of the electromagnetic induction coils arranged on the upper side and the lower side are the same, longitudinal magnetic flux induction heating is carried out in the thickness direction of the plate blank, and the heating efficiency and the temperature uniformity in the thickness direction of the plate blank are improved; the multi-layer packaging mode of the electromagnetic induction heater improves the heat efficiency and the safety; the free combination among the multiple groups of electromagnetic induction heaters and the external connection of the supporting platform and the lifting device improve the transportability.
Compared with the prior art, the utility model, have following advantage:
1) the induction heating device adopts a composite heating mode combining transverse magnetic flux induction heating and longitudinal magnetic flux induction heating, so that the heating efficiency and the heating uniformity are greatly improved;
2) the multi-layer packaging mode and the multi-group free combination mode of the electromagnetic induction heater reduce the heat energy loss and increase the flexibility and transportability of heating;
3) the induction heating device adopts an external lifting device, and the slab is ensured to be in the central position of the device according to the thickness adjusting device of the slab, so that the upper surface and the lower surface of the slab are heated uniformly, and the problem of uneven temperature distribution on the upper surface and the lower surface of the slab is avoided.
4) The electromagnetic induction coil adopts a hollow rectangular copper pipe and a novel wiring mode, fully utilizes a circular ring effect, a skin effect and a proximity effect, avoids an edge effect and improves the heating stability.
Drawings
Figure 1 is an induction heating apparatus for a slab (preferably 10 sets of electromagnetic induction heaters),
reference numerals denote an electromagnetic induction heater 1 and a support platform 2.
Fig. 2 is a schematic diagram of the wiring and working principle of the electromagnetic induction coil.
Figure 3 is a cross-sectional half view of the electromagnetic induction heater in section Y-Z,
figure 4 is a cross-sectional view of the electromagnetic induction heater taken in cross section X-Z,
the reference numerals of fig. 3 and 4 are: steel through hole 101, electromagnetic induction coil 102, magnetic flux concentrator 103, heat preservation layer 104, insulating layer 105.
Detailed Description
Example 1:
the induction heating device is adjusted through the external lifting device, so that the center of the steel through hole of the electromagnetic induction heater and the center of the intermediate blank are positioned on the same horizontal plane, and the upper surface and the lower surface of the intermediate blank are uniformly heated. Then, alternating current is introduced into the electromagnetic induction heating device through an external variable frequency alternating current power supply, and the external water-cooling distributor is used for supplying water to the interior of the coil to realize water cooling, so that the temperature stability of the coil is ensured. The induction heating device selects ten groups of electromagnetic induction heaters to be arranged at equal intervals, adopts a uniform heating mode, and sets the power of each group to be 3 MW. The thickness of the intermediate billet is 20mm, the surface temperature of the intermediate billet before heating is 950 ℃, the heating time is 20s, the surface temperature of the intermediate billet after heating is 1150 ℃, the temperature of each group is raised by 20 ℃, the accumulated temperature rise is 200 ℃, the surface temperature difference is less than or equal to 10 ℃, and the thickness temperature difference is less than or equal to 5 ℃.
Example 2:
the induction heating device is adjusted through the external lifting device, so that the center of the electromagnetic induction heater and the center of the plate blank are positioned on the same horizontal plane, and the upper surface and the lower surface of the plate blank are uniformly heated. Then, alternating current is introduced into the electromagnetic induction heating device through an external variable frequency alternating current power supply, and the external water-cooling distributor is used for supplying water to the interior of the coil to realize water cooling, so that the temperature stability of the coil is ensured. The induction heating device selects ten groups of electromagnetic induction heaters to be arranged at equal intervals, a front section heating mode is adopted, the power of each of the front seven groups is set to be 5MW, the heating effect is mainly achieved, the power of each of the rear three groups is set to be 0.5MW, and the temperature equalizing effect is mainly achieved. The thickness of the plate blank before heating is 70mm, the surface temperature of the plate blank is 25 ℃, the heating time is 120s, the surface temperature of the heated intermediate blank is 425 ℃, the cumulative temperature rise is 400 ℃, the surface temperature difference is less than or equal to 8 ℃, and the thickness temperature difference is less than or equal to 6 ℃.
Example 3:
the induction heating device is adjusted by the external lifting device, so that the center of the electromagnetic induction heater and the center of the plate strip steel are positioned on the same horizontal plane, and the upper surface and the lower surface of the plate strip steel are uniformly heated. Then, alternating current is introduced into the electromagnetic induction heating device through an external variable frequency alternating current power supply, and the external water-cooling distributor is used for supplying water to the interior of the coil to realize water cooling, so that the temperature stability of the coil is ensured. Eight groups of electromagnetic induction heaters are selected for the induction heating device to be arranged at equal intervals, an intermittent heating mode is adopted, the power of each group of odd groups is set to be 2MW, the power of each group of even groups is not opened, the heat conduction time in the plate blank is prolonged, and the uniform distribution of the temperature is facilitated. The thickness of the strip steel before heating is 4mm, the surface temperature of the strip steel is 500 ℃, the heating time is 15s, the surface temperature of the strip steel after heating is 750 ℃, the accumulated temperature rise is 250 ℃, the surface temperature difference is less than or equal to 6 ℃, and the thickness temperature difference is less than or equal to 3 ℃.
Claims (5)
1. A slab induction heating device is characterized in that: comprises a plurality of groups of electromagnetic induction heaters and a supporting platform; the supporting platform is used for fixing the electromagnetic induction heater, and the upper position and the lower position of the slab induction heating device are moved through the external lifting device, so that the center of the steel through hole of the electromagnetic induction heater and the center of the slab are positioned on the same horizontal line.
2. An induction heating apparatus for a sheet blank as set forth in claim 1, wherein: the plate blank comprises a continuous casting blank, an intermediate blank and a plate strip steel.
3. An induction heating apparatus for a sheet blank as set forth in claim 1, wherein: the electromagnetic induction heater comprises a steel through hole, an electromagnetic induction coil, a magnetic flux concentrator, a heat insulation layer and a packaging box of an insulation layer; the power of the electromagnetic induction heater is 0.5-5 MW; the steel through hole is surrounded by the electromagnetic induction coil; the magnetic flux concentrator is arranged on the periphery of the electromagnetic induction coil far away from the plate blank; the heat-insulating layer is wrapped on the periphery of the magnetic flux concentrator; the insulating layer is at the outermost layer.
4. A slab induction heating apparatus as set forth in claim 1 or 3, characterized in that: the electromagnetic induction coil in the electromagnetic induction heater is formed by continuously winding a hollow rectangular copper pipe according to a U shape and an inverted U shape, and the longitudinal current directions of the electromagnetic induction coils arranged on the upper surface and the lower surface are the same; the device is externally connected with a variable frequency alternating current power supply and a water-cooling distributor.
5. A slab induction heating apparatus as set forth in claim 1 or 3, characterized in that: the steel through holes are rectangular holes, the accommodated plate blank passes through the steel through holes and is parallel to the movement direction of the plate blank, the hole height is more than 5mm higher than the thickest plate blank, and the hole width is more than 10mm wider than the widest plate blank.
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| CN201920509701.6U CN209923383U (en) | 2019-04-16 | 2019-04-16 | Slab induction heating device |
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| CN201920509701.6U CN209923383U (en) | 2019-04-16 | 2019-04-16 | Slab induction heating device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109971928A (en) * | 2019-04-16 | 2019-07-05 | 北京科技大学 | A kind of slab induction heating apparatus |
| CN112911747A (en) * | 2021-01-14 | 2021-06-04 | 首钢京唐钢铁联合有限责任公司 | Linear magnetic circuit device and electromagnetic induction heater |
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2019
- 2019-04-16 CN CN201920509701.6U patent/CN209923383U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109971928A (en) * | 2019-04-16 | 2019-07-05 | 北京科技大学 | A kind of slab induction heating apparatus |
| CN109971928B (en) * | 2019-04-16 | 2023-09-15 | 北京科技大学 | Slab induction heating device |
| CN112911747A (en) * | 2021-01-14 | 2021-06-04 | 首钢京唐钢铁联合有限责任公司 | Linear magnetic circuit device and electromagnetic induction heater |
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