Induction heating equipment for iron ore smelting and smelting method

Abstract

The invention discloses induction heating equipment for iron ore smelting and a smelting method, belongs to the technical field of non-blast furnace iron smelting, and aims to solve the problems that molten steel is disturbed to influence the purity of the molten steel and the induction heating equipment interferes with a pipeline in the overturning process due to discharging in a dumping manner in the prior art. The induction heating equipment comprises a fixed furnace barrel and a rotary furnace barrel, the rotary furnace barrel is arranged on the outer wall of the fixed furnace barrel in a sleeving mode and can rotate relative to the fixed furnace barrel, an inner discharging hole is formed in the bottom of the side wall of the fixed furnace barrel, and an outer discharging hole is formed in the bottom of the side wall of the rotary furnace barrel; the induction heating equipment has a reaction mode and a discharging mode; when the induction heating equipment is in a reaction mode, the inner discharge holes and the outer discharge holes are staggered; when the induction heating equipment is in a discharging mode, the inner discharging hole and the outer discharging hole are communicated to form a discharging opening; and the rotary furnace barrel rotates relative to the fixed furnace barrel, so that the induction heating equipment is switched between a discharging mode and a reaction mode. The method can be used for iron ore smelting.

Description

Technical Field

[0001] This invention belongs to the field of non-blast furnace ironmaking technology, and particularly relates to an induction heating device and smelting method for iron ore smelting. Background Technology

[0002] The gas-based molten reduction smelting of iron ore is carried out using induction heating equipment. After smelting, the molten steel obtained from the reaction needs to be poured into a mold, which is called unloading.

[0003] Existing discharge methods typically employ a tilting technique, where the induction heating equipment is placed on a tilting device, which then flips the equipment. However, this tilting process causes disturbance in the molten steel, leading to mixing between the steel and slag at their interface and affecting the steel's purity. Furthermore, since the induction heating equipment involves various pipeline installations and connections, tilting the equipment for discharge can cause interference with these pipelines. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide an induction heating device and smelting method for iron ore smelting, in order to solve the problems in the prior art where the pouring method of material discharge causes disturbance to the molten steel, affecting the purity of the molten steel, and interference between the induction heating device and the pipeline during the inversion process.

[0005] The objective of this invention is mainly achieved through the following technical solutions.

[0006] The present invention provides an induction heating device for iron ore smelting, comprising a fixed furnace cylinder and a rotating furnace cylinder, wherein the rotating furnace cylinder is sleeved on the outer wall of the fixed furnace cylinder and is rotatable relative to the fixed furnace cylinder, an inner discharge hole is provided at the bottom of the side wall of the fixed furnace cylinder, and an outer discharge hole is provided at the bottom of the side wall of the rotating furnace cylinder.

[0007] Induction heating equipment has a reaction mode and a discharge mode;

[0008] When the induction heating equipment is in reaction mode, the inner discharge hole and the outer discharge hole are staggered; when the induction heating equipment is in discharge mode, the inner discharge hole and the outer discharge hole are connected to form a discharge port.

[0009] The rotation of the rotating furnace cylinder relative to the fixed furnace cylinder allows the induction heating equipment to switch between discharge mode and reaction mode.

[0010] Furthermore, the induction heating device also includes a sealing plug for sealing the inner discharge hole.

[0011] Furthermore, the sealing plug includes an inner sealing body and an outer sealing cylinder sleeved on the outer wall of the inner sealing body. The outer sealing cylinder includes a first plug cylinder and a second plug cylinder connected in sequence along a direction that gradually moves away from the axis of the induction heating equipment used for iron ore smelting.

[0012] Furthermore, the diameter of the inner discharge hole is greater than or equal to the outer diameter of the first plug cylinder, which is greater than or equal to the outer diameter of the second plug cylinder, which is greater than or equal to the inner diameter of the second plug cylinder, which is greater than or equal to the outer diameter of the inner sealing body. This makes the wall of the outer discharge hole protrude from the wall of the inner discharge hole, and the inner wall of the discharge port is stepped, as is the outer wall of the outer sealing cylinder.

[0013] Furthermore, the diameter of the inner discharge hole is equal to the outer diameter of the first plug, the diameter of the outer discharge hole is equal to the outer diameter of the second plug, and the inner diameters of the first and second plugs are equal to the outer diameter of the inner sealing body.

[0014] Furthermore, the induction heating device also includes a convex ring, on which at least one through hole is opened. The convex ring is located at the end of the outer discharge hole away from the inner discharge hole. The inner sealing body is T-shaped. When the induction heating device is in the discharge mode, the thickness of the protruding part of the inner sealing body is less than the distance between the second plug and the convex ring.

[0015] Furthermore, the number of through holes opened on the convex ring is multiple, and the multiple through holes are evenly arranged along the circumference of the convex ring.

[0016] Furthermore, the induction heating equipment also includes an induction coil, which is located in both the fixed furnace cylinder and the rotating furnace cylinder.

[0017] Furthermore, a receiving chamber for accommodating the induction coil is opened on the side of the fixed furnace cylinder facing the rotating furnace cylinder, and the induction coil is placed in the receiving chamber.

[0018] The present invention also provides a smelting method for iron ore smelting, which uses the above-mentioned induction heating equipment for iron ore smelting, and the smelting method includes the following steps:

[0019] The induction heating equipment is in reaction mode, with the inner and outer discharge holes staggered.

[0020] The smelting raw materials are added to the fixed furnace drum;

[0021] Turn on the induction heating equipment to induction heat the smelting raw materials until the raw materials are completely melted and reacted to obtain molten iron;

[0022] Rotating the rotating furnace cylinder causes a relative displacement between the rotating furnace cylinder and the fixed furnace cylinder, so that the positions of the outer discharge hole and the inner discharge hole correspond. The induction heating equipment switches from the reaction mode to the discharge mode, and the outer discharge hole and the inner discharge hole form the discharge port for molten iron.

[0023] Molten iron flows out from the discharge port, completing the discharge of molten iron.

[0024] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0025] A) The induction heating equipment for iron ore smelting provided by the present invention only requires rotating the furnace cylinder during the discharge process to connect the inner discharge hole and the outer discharge hole, without involving the rotation of the fixed furnace cylinder. Correspondingly, the pipelines between the induction heating devices will not be displaced, thereby ensuring the stability of the pipeline connection in the induction heating equipment.

[0026] B) The induction heating equipment for iron ore smelting provided by the present invention adopts a bottom discharge method. During the discharge process, the molten iron in the lower layer is in a relatively stable state, and the molten iron is discharged from the discharge port before the slag. This can achieve the separation of molten iron and slag during the discharge process, thereby ensuring the purity and quality of the molten iron.

[0027] C) The induction heating device for iron ore smelting provided by the present invention, when the induction heating device is in reaction mode, the outer sealing cylinder is located in the inner discharge hole, and the inner sealing body is located in the outer sealing cylinder. The outer sealing cylinder and the inner sealing body block the inner discharge hole. At the same time, due to the setting of the rotating furnace cylinder, the outer sealing cylinder and the inner sealing body can be effectively supported to resist the pressure of molten iron on both. Moreover, both are cylindrical in shape and have sufficient mechanical strength, thereby effectively preventing deformation of both and ensuring the tightness of the seal.

[0028] D) The induction heating device for iron ore smelting provided by this invention uses a convex ring to axially limit the inner sealing body, which can prevent the inner sealing body 5 from falling into the discharged molten iron while achieving molten iron discharge. It should be noted that after the molten iron is discharged and before the non-metallic melt flows out, the inner sealing body and the outer sealing cylinder are pushed into the inner discharge hole. Then, the furnace cylinder is rotated to make the inner discharge hole and the outer discharge hole misaligned, thus completing the reset of the sealing plug.

[0029] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0030] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0031] Figure 1 A schematic diagram of the iron ore gas-based melting and reduction system provided in Embodiment 1 of the present invention is provided, in which a tilting assembly is used for material discharge;

[0032] Figure 2A schematic diagram of the sealing plug in the iron ore gas-based melting reduction system provided in Embodiment 1 of the present invention is shown, with the induction heating device in reaction mode;

[0033] Figure 3 The diagram below shows the structure of the sealing plug in the iron ore gas-based molten reduction system provided in Embodiment 1 of the present invention. The induction heating device is in the discharge mode, and the arrow indicates the direction of molten iron flow.

[0034] Figure label:

[0035] 1-Fixed furnace cylinder; 2-Rotating furnace cylinder; 3-Inner discharge hole; 4-Outer discharge hole; 5-Inner sealing body; 6-First plug cylinder; 7-Second plug cylinder; 8-Protruding ring; 9-Induction coil. Detailed Implementation

[0036] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0037] Example 1

[0038] This embodiment provides an induction heating device for iron ore smelting, see [link to relevant documentation]. Figure 1 It includes a fixed furnace cylinder 1 and a rotating furnace cylinder 2. The rotating furnace cylinder 2 is sleeved on the outer wall of the fixed furnace cylinder 1 and can rotate relative to the fixed furnace cylinder 1. The fixed furnace cylinder 1 is a fixed component, and the rotating furnace cylinder 2 is a rotating component. An inner discharge hole 3 is opened at the bottom of the side wall of the fixed furnace cylinder 1, and an outer discharge hole 4 is opened at the bottom of the side wall of the rotating furnace cylinder 2.

[0039] It should be noted that induction heating equipment used in iron ore smelting has both reaction mode and discharge mode.

[0040] When the induction heating equipment used for iron ore smelting is in reaction mode, the inner discharge hole 3 and the outer discharge hole 4 are staggered and not connected.

[0041] When the induction heating equipment used for iron ore smelting is in the discharge mode, the inner discharge hole 3 and the outer discharge hole 4 are connected to form a discharge port. The rotating furnace cylinder 2 rotates relative to the fixed furnace cylinder 1, causing the induction heating equipment used for iron ore smelting to switch between the discharge mode and the reaction mode.

[0042] Compared with the prior art, the induction heating equipment for iron ore smelting provided in this embodiment only requires rotating the furnace cylinder 2 to connect the inner discharge hole 3 and the outer discharge hole 4 during the discharge process of molten iron after smelting is completed. It does not involve the rotation of the fixed furnace cylinder 1. Correspondingly, the pipelines connected to the fixed furnace cylinder 1 do not need to be displaced, which can effectively simplify the pipeline layout in the induction heating equipment. At the same time, it can also ensure the stability of the pipeline connection in the induction heating equipment.

[0043] The aforementioned induction heating equipment for iron ore smelting adopts a bottom discharge method. During the discharge process, the molten iron in the lower layer is in a relatively stable state, and the molten iron is discharged from the discharge port before the slag. This can achieve the separation of molten iron and slag during the discharge process, thereby ensuring the purity and quality of the molten iron.

[0044] From the perspective of structural strength, since the fixed furnace 1 is the main smelting chamber and the rotating furnace 2 is an auxiliary furnace 1 set up to achieve bottom discharge, the thickness of the fixed furnace 1 is greater than the thickness of the rotating furnace 2. For example, the thickness ratio of the fixed furnace 1 to the rotating furnace 2 is 1.1 to 1.2: 0.8 to 0.9.

[0045] From the perspective of smooth material discharge, for example, the ratio of the diameter of the inner discharge hole 3 to the height of the fixed furnace cylinder 1 is 1-2:10-15.

[0046] Similarly, the ratio of the diameter of the external discharge hole 4 to the height of the fixed furnace cylinder 1 is 0.8-1.9:10-15.

[0047] In the gas-liquid molten reduction reaction process, to reduce the leakage of molten iron, the aforementioned induction heating equipment for iron ore smelting also includes a sealing plug. For details regarding the structure of the sealing plug, please refer to... Figure 3 It includes an inner sealing body 5 and an outer sealing cylinder sleeved on the outer wall of the inner sealing body 5. The outer sealing cylinder includes a first plug cylinder 6 and a second plug cylinder 7 connected in sequence along the direction gradually away from the axis of the induction heating equipment used for iron ore smelting.

[0048] For example, the diameter of the inner discharge hole 3 is greater than or equal to the outer diameter of the first plug cylinder 6, which is greater than or equal to the outer diameter of the outer discharge hole 4, which is greater than or equal to the outer diameter of the second plug cylinder 7, which is greater than or equal to the inner diameter of the inner sealing body 5, so that the hole wall of the outer discharge hole 4 protrudes beyond the hole wall of the inner discharge hole 3, the inner wall of the discharge port is stepped, and the outer wall of the outer sealing cylinder is stepped.

[0049] It should be noted that when the induction heating equipment used for iron ore smelting is in reaction mode, the outer sealing cylinder is located in the inner discharge hole 3, and the inner sealing body 5 is located in the outer sealing cylinder. The outer sealing cylinder and the inner sealing body 5 block the inner discharge hole 3. At the same time, due to the setting of the rotating furnace cylinder 2, the outer sealing cylinder and the inner sealing body 5 can be effectively supported to resist the pressure of molten iron on them. Moreover, the two are cylindrical in shape and have sufficient mechanical strength, which can effectively prevent the two from deforming and ensure the tightness of the seal.

[0050] When discharge is required, the rotating furnace cylinder 2 is rotated, causing a relative displacement between the rotating furnace cylinder 2 and the fixed furnace cylinder 1. The positions of the outer discharge hole 4 and the inner discharge hole 3 correspond (i.e., the axes coincide). The induction heating equipment used for iron ore smelting switches from the reaction mode to the discharge mode. Under the pressure of the molten iron in the induction heating equipment used for iron ore smelting, the outer sealing cylinder and the inner sealing body 5 move towards the outer discharge hole 4.

[0051] When the stepped surface of the outer sealing cylinder moves to the stepped surface of the inner wall of the discharge port, the wall of the outer discharge hole 4 will interfere with the outer sealing cylinder, causing the outer sealing cylinder to stop moving. The outer sealing cylinder can seal the gap between the rotating furnace cylinder 2 and the fixed furnace cylinder 1. The inner sealing body 5 continues to move and separates from the outer sealing cylinder, so that the inner discharge hole 3, the outer sealing cylinder and the outer discharge hole 4 are connected to form the discharge port of molten iron.

[0052] From the perspective of sealing tightness, preferably, the diameter of the inner discharge hole 3 is equal to the outer diameter of the first plug 6, the diameter of the outer discharge hole 4 is equal to the outer diameter of the second plug 7, and the inner diameters of the first plug 6 and the second plug 7 are equal to the outer diameter of the inner sealing body 5. In the reaction mode, the inner discharge hole 3, the first plug 6 and the inner sealing body 5 are seamlessly fitted.

[0053] During the discharge process, since the inner sealing body 5 will detach from the outer sealing cylinder, in order to prevent it from falling into the discharged molten iron, the induction heating device for iron ore smelting also includes a convex ring 8. The convex ring 8 has at least one through hole and is located at the end of the outer discharge hole 4 away from the inner discharge hole 3. The inner sealing body 5 is T-shaped.

[0054] It should be noted that when the induction heating equipment used for iron ore smelting is in the discharge mode, in order to form a gap for the flow of molten iron, the thickness of the protruding part of the inner sealing body 5 is less than the distance between the second plug cylinder 7 and the convex ring 8.

[0055] It should also be noted that when the inner sealing body 5 continues to move to the convex ring 8, the protruding part of the inner sealing body 5 will interfere with the convex ring 8, causing the inner sealing body 5 to stop moving. The inner discharge hole 3, the outer sealing cylinder, the gap between the outer sealing cylinder and the inner sealing body 5, the gap between the inner sealing body 5 and the outer discharge hole 4, and the through hole of the convex ring 8 can be connected in sequence to form the discharge port of molten iron, so as to realize the discharge of molten iron.

[0056] With the above structure, the convex ring 8 axially limits the inner sealing body 5, which can prevent the inner sealing body 5 from falling into the discharged molten iron while achieving molten iron discharge. It should be noted that after the molten iron is discharged and before the non-metallic melt flows out, the inner sealing body 5 and the outer sealing cylinder are pushed into the inner discharge hole 3. Then, the furnace cylinder 2 is rotated to make the inner discharge hole 3 and the outer discharge hole 4 misaligned, thus completing the reset of the sealing plug.

[0057] For example, the number of through holes opened on the convex ring is multiple, and the multiple through holes are evenly arranged along the circumference of the convex ring.

[0058] It is understandable that, in order to enable the induction heating device to heat the cavity, the induction heating device for iron ore smelting also includes an induction coil 9. The induction coil 9 is located on the fixed furnace cylinder 1 and the rotating furnace cylinder 2. The heat generated by the induction coil 9 is transferred to the cavity through the side wall of the fixed furnace cylinder 1 to induction heat the raw materials in the cavity.

[0059] From the perspective of circuit connection, the fixed furnace cylinder 1 has a accommodating chamber for accommodating the induction coil 9 on the side facing the rotating furnace cylinder 2. The induction coil 9 is placed in the accommodating chamber, which means that the induction coil 9 is also a fixed component.

[0060] In order to cool the induction coil 9 and reduce damage to the induction coil 9, the fixed furnace cylinder 1 and the rotating furnace cylinder 2 during the smelting process, the induction heating equipment for iron ore smelting also includes a cooling assembly 10, which is used to cool the induction coil 9, the fixed furnace cylinder 1 and the rotating furnace cylinder 2.

[0061] For example, the cooling assembly 10 includes a cooling water passage opened in the rotating furnace cylinder 2, through which cooling water is introduced to effectively cool the induction coil 9, the fixed furnace cylinder 1 and the rotating furnace cylinder 2.

[0062] Example 2

[0063] This embodiment provides a smelting method for iron ore smelting, employing the induction heating equipment for iron ore smelting provided in Embodiment 1. The smelting method includes the following steps:

[0064] Step a: The induction heating equipment is in reaction mode, the inner discharge hole 3 and the outer discharge hole 4 are staggered, the outer sealing cylinder is located in the inner discharge hole 3, the inner sealing body 5 is located in the outer sealing cylinder, and the outer sealing cylinder and the inner sealing body 5 block the inner discharge hole 3.

[0065] Step b: Add the smelting raw materials into the fixed furnace barrel 1;

[0066] Step c: Turn on the induction heating equipment to induction heat the smelting raw materials until the smelting raw materials are completely melted and reacted to obtain molten iron;

[0067] Step d: Rotate the rotating furnace cylinder 2 so that the rotating furnace cylinder 2 is relatively displaced relative to the fixed furnace cylinder 1, and the positions of the outer discharge hole 4 and the inner discharge hole 3 correspond to each other, and the induction heating equipment switches from the reaction mode to the discharge mode.

[0068] Step e: Under the pressure of molten iron in the induction heating equipment used for iron ore smelting, the outer sealing cylinder and the inner sealing body 5 move towards the outer discharge hole 4;

[0069] Step f: When the stepped surface of the outer sealing cylinder moves to the stepped surface of the inner wall of the discharge port, the hole wall of the outer discharge hole 4 will interfere with the outer sealing cylinder, the outer sealing cylinder will stop moving, and the gap between the rotating furnace cylinder 2 and the fixed furnace cylinder 1 will be sealed.

[0070] Step g: The inner sealing body 5 continues to move and detaches from the outer sealing cylinder;

[0071] Step h: When the inner sealing body 5 continues to move to the convex ring 8, the protruding part of the inner sealing body 5 will interfere with the convex ring 8, the inner sealing body 5 will stop moving, and the inner discharge hole 3, the outer sealing cylinder, the gap between the outer sealing cylinder and the inner sealing body 5, the gap between the inner sealing body 5 and the outer discharge hole 4 and the mesh of the convex ring 8 will be connected in sequence to form the discharge port of molten iron. The molten iron flows out from the discharge port, completing the discharge of molten iron.

[0072] Compared with the prior art, the beneficial effects of the smelting method for iron ore smelting provided in this embodiment are basically the same as the beneficial effects of the induction heating equipment for iron ore smelting provided in Embodiment 1, and will not be described in detail here.

[0073] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An induction heating device for iron ore smelting, characterized in that, It includes a fixed furnace cylinder and a rotating furnace cylinder. The rotating furnace cylinder is sleeved on the outer wall of the fixed furnace cylinder and can rotate relative to the fixed furnace cylinder. An inner discharge hole is opened at the bottom of the side wall of the fixed furnace cylinder, and an outer discharge hole is opened at the bottom of the side wall of the rotating furnace cylinder. The induction heating device has a reaction mode and a discharge mode; When the induction heating device is in reaction mode, the inner discharge hole and the outer discharge hole are staggered; when the induction heating device is in discharge mode, the inner discharge hole and the outer discharge hole are connected to form a discharge port. The rotation of the rotating furnace cylinder relative to the fixed furnace cylinder allows the induction heating equipment to switch between discharge mode and reaction mode.

2. The induction heating equipment for iron ore smelting according to claim 1, characterized in that, The induction heating device also includes a sealing plug for sealing the inner discharge hole.

3. The induction heating equipment for iron ore smelting according to claim 2, characterized in that, The sealing plug includes an inner sealing body and an outer sealing cylinder sleeved on the outer wall of the inner sealing body. The outer sealing cylinder includes a first plug cylinder and a second plug cylinder connected in sequence along a direction that gradually moves away from the axis of the induction heating equipment used for iron ore smelting.

4. The induction heating equipment for iron ore smelting according to claim 3, characterized in that, The diameter of the inner discharge hole is greater than or equal to the outer diameter of the first plug cylinder, which is greater than or equal to the outer diameter of the outer discharge hole, which is greater than or equal to the inner diameter of the second plug cylinder, which is greater than or equal to the outer diameter of the inner sealing body. This makes the wall of the outer discharge hole protrude beyond the wall of the inner discharge hole. The inner wall of the discharge port is stepped, and the outer wall of the outer sealing cylinder is stepped.

5. The induction heating equipment for iron ore smelting according to claim 4, characterized in that, The diameter of the inner discharge hole is equal to the outer diameter of the first plug cylinder, the diameter of the outer discharge hole is equal to the outer diameter of the second plug cylinder, and the inner diameters of the first plug cylinder and the second plug cylinder are equal to the outer diameter of the inner sealing body.

6. The induction heating device for iron ore smelting according to claim 4, characterized in that, The induction heating device also includes a convex ring, on which at least one through hole is opened. The convex ring is located at the end of the outer discharge hole away from the inner discharge hole. The inner sealing body is T-shaped. When the induction heating device is in the discharge mode, the thickness of the protruding part of the inner sealing body is less than the distance between the second plug and the convex ring.

7. The induction heating device for iron ore smelting according to claim 6, characterized in that, The convex ring has multiple through holes, which are evenly arranged along the circumference of the convex ring.

8. The induction heating device for iron ore smelting according to any one of claims 1 to 7, characterized in that, The induction heating device also includes an induction coil, which is disposed on the fixed furnace cylinder and the rotating furnace cylinder.

9. The induction heating device for iron ore smelting according to claim 8, characterized in that, The fixed furnace cylinder has a accommodating chamber on the side facing the rotating furnace cylinder to accommodate the induction coil, and the induction coil is placed in the accommodating chamber.

10. A smelting method for iron ore smelting, characterized in that, The smelting method using the induction heating equipment for iron ore smelting as described in any one of claims 1 to 9 includes the following steps: The induction heating device is in reaction mode, and the inner discharge port and the outer discharge port are staggered. The smelting raw materials are added to the fixed furnace drum; Turn on the induction heating equipment to induction heat the smelting raw materials until the raw materials are completely melted and reacted to obtain molten iron; Rotating the rotating furnace cylinder causes a relative displacement between the rotating furnace cylinder and the fixed furnace cylinder. The positions of the outer discharge hole and the inner discharge hole correspond to each other. The induction heating device switches from the reaction mode to the discharge mode. The outer discharge hole and the inner discharge hole form a discharge port for molten iron. Molten iron flows out from the discharge port, completing the discharge of molten iron.

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