CN212704334U

CN212704334U - Electromagnetic induction heating device for intermediate tank

Info

Publication number: CN212704334U
Application number: CN202021518905.5U
Authority: CN
Inventors: 刘长青; 赵清; 管炜
Original assignee: Wuhan Xisai Metallurgical Engineering Co ltd
Current assignee: Wuhan Xisai Metallurgical Engineering Co ltd
Priority date: 2020-07-28
Filing date: 2020-07-28
Publication date: 2021-03-16
Anticipated expiration: 2030-07-28

Abstract

The utility model discloses an electromagnetic induction heating device for pans has solved the complicated, old conticaster system problem that is not suitable for of current heating device structure. The technical scheme includes that the planar coil comprises a planar coil body and magnetizers, the magnetizers are covered on the back face of the planar coil body and are uniformly distributed, the magnetizers are U-shaped magnetizers, the opening direction of the U-shaped magnetizers faces to a heating area in an intermediate tank body, and the planar coil body is a multi-turn planar spiral coil wound by a hollow rectangular copper pipe. The utility model discloses simple structure, installation are maintained not to be restricted by site conditions, the molten steel heating is even, and heating location nature is good, be favorable to realizing low superheat degree constant temperature casting, safe and reliable.

Description

Electromagnetic induction heating device for intermediate tank

Technical Field

The utility model relates to a molten steel is smelted and the continuous casting field, specific electromagnetic induction heating device for pans that says so.

Background

In recent years, the practice of the development of continuous casting technology shows that constant temperature casting with low superheat plays an important role in improving the quality of a cast slab and stabilizing the operation. And controlling the temperature or superheat of the molten steel of the tundish is one of the most effective methods for improving productivity, improving solidification structure, and improving product quality.

In the continuous casting process, because heat loss such as heat radiation of a liquid level of the tundish and heat absorption of a wall covering refractory material can cause the temperature of molten steel in the tundish to drop, the first two furnaces of molten steel in the initial casting stage generally need to keep a relatively high superheat degree to offset the great drop of the temperature of the molten steel, so that the fluctuation range of the temperature of the molten steel from high to low is relatively large in a period of time after casting, and the casting stage is also the stage which is most easy to cause steel leakage.

In recent years, various forms of tundish molten steel heating techniques have been developed, including an arc heating method, a tundish molten steel surface plasma heating method, a tundish passage type electromagnetic induction heating method, a tundish nozzle electromagnetic heating method, and the like. Wherein the electrode arrangement of the electric arc heating method is complex, and the electrode consumption has the function of recarburizing the molten steel; in the plasma heating method, because the molten steel liquid level of the tundish is not stably controlled, the plasma arc is difficult to maintain, so that arc extinction is caused, and electromagnetic radiation generated by the plasma has relatively large interference on a weak current system; the channel type electromagnetic induction heating method of the tundish is characterized in that a molten zone pool under a ladle nozzle and a casting zone pool above a casting nozzle are communicated by a transverse channel, and an electromagnetic induction heating method is adopted on the channel to heat molten metal flowing through the channel, so that the method is inconvenient to install and maintain, the tundish needs special design, the appearance of the tundish is greatly changed and is limited by field conditions, the tundish is not suitable for an old continuous casting machine system, and the installation mode determines that the efficiency is not high; the electromagnetic heating method for the water gap of the tundish is to directly heat the molten steel flowing into the crystallizer by the tundish, has no metallurgical effect, cannot achieve the purpose of homogenizing the temperature of the molten steel in the tundish, has no help for realizing constant-temperature pouring, influences the production operation by the installation position of the tundish, and continuously exerts an electromagnetic effect on the water gap of the stopper rod to greatly reduce the service life of the water gap.

Disclosure of Invention

The utility model aims at solving the technical problem, provide a simple structure, installation are maintained and are not restricted by site conditions, the molten steel heating is even, heating location nature is good, be favorable to realizing low superheat degree constant temperature casting, safe and reliable's an electromagnetic induction heating device for pans.

The technical scheme includes that the planar coil comprises a planar coil body and magnetizers, the magnetizers are covered on the back face of the planar coil body and are uniformly distributed, the magnetizers are U-shaped magnetizers, the opening direction of the U-shaped magnetizers faces to a heating area in an intermediate tank body, and the planar coil body is a multi-turn planar spiral coil wound by a hollow rectangular copper pipe.

And the plane coil and the U-shaped magnetizer are wrapped with heat insulation protective layers.

An insulating layer is arranged between two adjacent planar coils.

The hollow part of the hollow rectangular copper pipe is communicated with a water supply passage.

The water supply passage and the cable of the planar coil are connected to the hydro-electric integral joint.

Has the advantages that:

1) the U-shaped magnetizer is covered outside the planar coil, the opening direction faces to a heating area in the tundish body, directional heating can be realized, and meanwhile, the U-shaped magnetizer has a shielding effect on magnetic lines of force facing to the outside of the tundish, so that the tundish shell is prevented from being heated.

2) The planar coil is adopted for magnetic induction heating, the structure is simple, the size is small, the installation and the maintenance are easy, the limitation of field conditions is avoided, and the conventional intermediate tank body can be reconstructed. The planar coil is a multi-turn planar spiral coil wound by a hollow rectangular copper pipe, cooling water can be introduced into the hollow part of the hollow rectangular copper pipe to ensure uniform heating gradient, and the planar coil cannot be damaged by overheating; the plane coil and the U-shaped magnetizer are wrapped with the heat insulation protective layer, so that the surrounding parts can be protected from being damaged by overheating after the device is installed, and the service life of the device is prolonged.

3) The utility model discloses very simple structure, fixed point heating is effectual, can be convenient install bottom or the lateral wall at the pans body, does not receive the site conditions restriction, especially is fit for old conticaster and reforms transform, maintains very simply, and the running cost is low.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of a planar coil.

Fig. 3 is an installation diagram of the present invention.

Fig. 4 is a right side view of fig. 3.

Wherein, 1, an intermediate tank; 2-a permanent layer; 3-a working layer; 4-electromagnetic induction heating device; 4.1-plane coil, 4.11-hollow rectangular copper tube; 4.12-hollow; 4.2-insulating layer; 4.3-U-shaped magnetizer; 4.4-water, electricity integrative joint body; 4.5-heat insulation protective layer; and 5, molten steel.

Detailed Description

The invention will be further explained with reference to the drawings:

referring to fig. 1, the electromagnetic induction heating apparatus of the present invention includes a planar coil 4 and a magnetizer, a plurality of uniformly arranged back sides of the planar coil 4.1 cover the magnetizer, the magnetizer is a U-shaped magnetizer 4.3, an opening direction of the U-shaped magnetizer 4.3 faces a heating area in the intermediate tank, referring to fig. 2, the planar coil 4.1 is a multi-turn planar spiral coil wound by a hollow rectangular copper tube 4.11, and relevant parameters (such as winding turns and the like) of the coil can be designed according to the implementation requirement; the hollow rectangular copper tube 4.11 has a hollow portion 4.12 communicating with the water supply passage. The planar coils 4.1 and the U-shaped magnetizers 4.3 are wrapped with heat insulation protective layers 4.5, and an insulation layer 4.2 is arranged between every two adjacent planar coils 4.1. The water supply passage and the cable of the planar coil 4.1 are connected to a hydro-electrical integral joint 4.4.

Referring to fig. 3, the electromagnetic heating induction device 4 is installed in the permanent layer 2 on the side wall of the intermediate tank 1, and is protected by the permanent layer 2 and the working layer 3 during working, the opening direction of the U-shaped magnetizer 4.3 faces to the heating area in the intermediate tank 1, a hole is formed in the corresponding position on the shell of the intermediate tank 1, and the water and electricity integrated connector body 4.4 of the electromagnetic heating induction device 4 extends out of the hole, so as to be conveniently connected with the cable corresponding to the external water cooling pipeline and the power supply.

The hollow part 4.12 of the hollow rectangular copper tube 4.11 of the planar coil 4.1 is filled with low-temperature cooling water through a water supply passage to cool the planar coil 4.1. When the electromagnetic heating induction heating device works, the electromagnetic heating power supply is used for providing single-phase medium-frequency current for the electromagnetic heating induction device 4, so that the planar coil 4.1 generates an alternating magnetic field, the U-shaped magnetizer 4.3 can intensively guide the magnetic energy generated by the planar coil 4.1 to the heated molten steel 5, the alternating magnetic field generates eddy current in the molten steel 5, the molten steel is heated to be heated, and meanwhile, the U-shaped magnetizer 4.3 has a shielding effect on magnetic lines of force on the outer side of the tundish 1, so that the tundish shell 1 can be prevented from being heated.

According to the size of the intermediate tank 1, 4 sets or 6 sets of electromagnetic heating induction devices 4 can be installed on one intermediate tank optionally. According to the molten steel temperature of different areas in the tundish, the input power of the electromagnetic heating inductor 4 can be changed, and the stable molten steel temperature of the areas is ensured.

Claims

1. The utility model provides an electromagnetic induction heating device for pans, includes planar coil and magnetizer, its characterized in that, a plurality of evenly arrange planar coil's back cover dress magnetizer, the magnetizer is the U-shaped magnetizer, the opening direction of U-shaped magnetizer is towards the internal heating region of pans, planar coil is the multiturn planar spiral coil by hollow rectangle copper pipe coiling.

2. The electromagnetic induction heating apparatus for the tundish of claim 1, wherein the planar coil and the U-shaped magnetizer are wrapped with a heat insulating protective layer.

3. The electromagnetic induction heating apparatus for the tundish of claim 1 or 2, wherein an insulating layer is provided between adjacent two of the planar coils.

4. The electromagnetic induction heating apparatus for the intermediate tank as claimed in claim 1 or 2, wherein the hollow portion of the hollow rectangular copper pipe communicates with the water supply passage.

5. The electromagnetic induction heating apparatus for the tundish of claim 4, wherein the cables of the water supply passage and the planar coil are connected to a hydro-electric integral joint.