Water-cooled furnace cover for ladle refining furnace

Abstract

The utility model relates to a water-cooled furnace cover for a ladle refining furnace, and belongs to the technical field of metallurgy. Comprising a furnace cover body, a furnace door device covering the furnace cover body, a refractory cover plate and a dust removal flue, the furnace cover body is communicated with the dust removal flue through an exhaust inlet, one end of the dust removal flue is connected with a smoke outlet pipeline, and smoke in a furnace is exhausted from the smoke outlet pipeline through the exhaust inlet and the dust removal flue; a butt joint surface between the dust removal flue and the smoke outlet pipeline is an inclined surface, and the butt joint surface is sealed through a heat-resistant flexible material; an exhaust inlet is formed between the furnace door device and the furnace cover body, and the dust removal flue is connected with the furnace door device through a first auxiliary flue; the furnace cover body is further provided with a discharging pipe, and the dust removal flue communicates with the discharging pipe through a second auxiliary flue. A water cooling cover plate is arranged on the upper surface of the side, close to the smoke outlet pipeline, of the dust removal flue and located above the air suction opening. The utility model has a simple and reliable structure, completely eliminates the problem that the skirt exhaust inlet is often blocked and is difficult to clean, and reduces the consumption of cooling water.

Description

TECHNICAL FIELD

[0001] The utility model belongs to metallurgical technical field relates to a water -cooled furnace cover for ladle refining furnace. BACKGROUND

[0002] In the current steel smelting technical field, the ladle refining furnace as the key equipment of improving the quality of molten steel, the optimization of its performance is directly related to the improvement of production efficiency and product quality. However, the water-cooled furnace cover design of traditional ladle refining furnace, especially the plate type induced draft flue and the tubular water-cooled structure of main dust removal flue used in the lower skirt, although meet the production demand to some extent, but a series of problems to be solved are exposed in actual application.

[0003] Firstly, the plate type induced draft flue design of the lower skirt of the furnace cover, since it is directly exposed to the high-temperature and high-dust smelting environment, is easy to be blocked by the splashed slag in the smelting process. These blockages are not only difficult to clean, but also increase the labor intensity and safety risk of workers, and at the same time affect the effective capture and emission of flue gas, reduce the dust removal efficiency, and cause potential pollution to the environment.

[0004] Secondly, the tubular water-cooled structure of the main dust removal flue, although can effectively control the flue temperature, but this design requires a large amount of cooling water, not only increases the production cost, but also puts pressure on water resources. In today's energy shortage and precious water resources, it is particularly important to find a more energy-efficient cooling solution.

[0005] Thirdly, the butt joint surface between the dust removal flue of the furnace cover and the dust removal pipeline is designed as a parallel vertical surface with a reserved gap. The original intention of this design is to facilitate the lifting operation of the furnace cover. However, in the actual operation process, this gap becomes a channel for the mixing of "wild wind" (i.e. unfiltered external air) into the furnace, not only dilutes the furnace atmosphere, affects the smelting effect, but also may introduce impurities, reduce the purity of molten steel.

[0006] In addition, the nitrogen sealing system of the material tapping pipe also has problems. In the traditional design, nitrogen sealing is mainly used to prevent the leakage of furnace gas, but due to improper structure or operation, nitrogen sealing failure may occasionally occur, leading to fluctuations in the furnace atmosphere, and even may cause suffocation risk, posing a serious threat to production safety.

[0007] In summary, the design of the existing water-cooled furnace cover and dust removal system of the ladle refining furnace has many deficiencies, and urgent technical innovation and improvement are needed to promote the sustainable development of the steel industry and achieve the win-win of environmental friendliness and economic benefits. INVENTION CONTENTS

[0008] Therefore, the water-cooled furnace cover for the steel ladle refining furnace has the advantages of simple and reliable structure, complete elimination of the problem of frequent blockage of the skirt air suction port and difficult cleaning, and reduced cooling water consumption.

[0009] To achieve the above object, the utility model provides the following technical scheme:

[0010] A water-cooled furnace cover for a steel ladle refining furnace, comprising a furnace cover body, a refractory cover plate arranged on the furnace cover body, a dust removal flue arranged on the side of the refractory cover plate away from the furnace cover body, and an air suction port arranged between the furnace cover body and the dust removal flue.

[0011] Optionally, the dust removal flue comprises a main flue arranged above the refractory cover plate, and an air suction port is arranged between the main flue and the furnace cover body.

[0012] Optionally, the furnace cover body is further provided with a feeding pipe, and the main flue is connected to the feeding pipe through a second auxiliary flue.

[0013] Optionally, the dust removal flue is provided with a detachable water-cooled cover plate.

[0014] Optionally, the water-cooled cover plate partially covers the upper surface of the main flue on the side close to the smoke outlet pipe and is arranged above the air suction port.

[0015] Optionally, the water-cooled cover plate partially covers the upper surface of the main flue on the side close to the smoke outlet pipe and is arranged above the air suction port.

[0016] Optionally, the furnace cover body is composed of a plurality of water-cooled pipes arranged side by side, and the furnace cover body is further provided with a water distributor connected to the water-cooled pipes.

[0017] Optionally, the abutment surface is inclined toward the side of the smoke outlet pipe.

[0018] Optionally, the heat-resistant flexible material is arranged around the outer periphery of the abutment surface.

[0019] Optionally, the furnace cover body is further provided with a wire feeding port, and a wire feeding cover plate is arranged on the wire feeding port.

[0020] The utility model has the advantages of:

[0021] The utility model avoids high temperature flue gas from spilling from the furnace door and the discharging pipe, is favorable for maintaining the furnace pressure, reduces flue gas spillover pollution, satisfies increasingly stringent environmental protection requirements, increases the auxiliary flue between the furnace door and the main flue, cancels the nitrogen seal of the discharging pipe, and completely eliminates the suffocation hidden danger existing in the nitrogen seal of the discharging pipe.

[0022] The abutment surface of the dust removal flue and the smoke outlet pipeline is changed from the parallel vertical surface with a reserved gap to the gapless contact inclined surface, and the abutment surface is sealed by heat-resistant sealing material, so that the channel for mixing "wild wind" into the furnace is avoided, and the smelting effect and the purity of the molten steel are ensured; the abutment inclined surface is arranged to be inclined towards the side of the smoke outlet pipeline, so that the sealing effect is ensured, and the convenience of the furnace cover lifting operation is provided.

[0023] The structure is simple and reliable, the air suction of the lower skirt of the furnace cover is cancelled, the air suction of the upper top surface of the furnace cover is changed, and the problem that the air suction port of the skirt is often blocked and difficult to clean is completely eliminated.

[0024] The dust removal flue is in the form of a plate type knot, only the upper surface of the main flue close to the dust removal pipeline is provided with a locally covered water cooling cover plate, the water consumption of the furnace cover is greatly reduced compared with the water cooling pipe type dust removal flue of the water cooling furnace cover, and the production cost is reduced.

[0025] Other advantages, objects and features of the utility model will be described in the subsequent description to some extent, and to some extent, will be obvious to those skilled in the art based on the study of the following text or can be taught from the practice of the utility model. The objects and other advantages of the utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to make the purpose, technical scheme and advantages of the utility model more clear, the preferred detailed description of the utility model will be combined with the drawings below, in which:

[0027] Fig. 1 It is the front view of the water cooling furnace cover of the ladle refining furnace.

[0028] Fig. 2 It is the top view of the water cooling furnace cover for the ladle refining furnace.

[0029] Reference signs:

[0030] 1 furnace cover body, 2 refractory cover plate, 3 dust removal flue, 31 main flue, 32 first auxiliary flue, 33 second auxiliary flue, 4 air suction port, 5 furnace door device, 6 knot layer, 7 water cooling cover plate, 8 heat-resistant flexible material, 10 discharging pipe, 11 wire feeding cover plate, 12 water distributor, 13 smoke outlet pipeline, 14 abutment surface. DETAILED DESCRIPTION

[0031] The other advantages and functions of the present application can be easily understood by those skilled in the art from the disclosure of the present application. The present application can also be implemented or applied through other different specific embodiments, and various modifications or changes can be made to the details in the present application based on different views and applications without departing from the spirit of the present application. It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of the present application, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0032] The drawings are only used for exemplary illustration, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation on the present application; in order to better illustrate the embodiments of the present application, some components in the drawings can be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings can be omitted.

[0033] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present application, and for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0034] Please refer to Figs. 1-2 The present application is a water-cooled cover for a ladle refining furnace, which comprises a cover body 1, a refractory cover plate 2 arranged on the cover body 1, a dust removal flue 3 arranged on the side of the refractory cover plate 2 away from the cover body 1, an air suction port 4 connecting the cover body 1 and the dust removal flue 3, an exhaust pipe 13 connected to the dust removal flue 3, and the exhaust pipe 13 being arranged on the side of the dust removal flue 3 away from the cover body 1; the flue gas in the furnace is discharged from the exhaust pipe 13 through the air suction port 4 and the dust removal flue 3; the abutting surface 14 between the dust removal flue 3 and the exhaust pipe 13 is an inclined surface inclined towards the side of the exhaust pipe 13, and the abutting surface 14 is sealed by a heat-resistant flexible material 8 to meet the sealing requirements in a high-temperature environment; the heat-resistant flexible material 8 is arranged around the outer periphery of the abutting surface 14.

[0035] The dust-removing flue 3 is provided with a detachable water-cooled cover plate 7; the water-cooled cover plate 7 partially covers the upper surface of the main flue 31 on the side close to the smoke outlet pipeline 13 and is located above the air inlet 4. A knot layer 6 is arranged between the inner side of the dust-removing flue 3 and the dust-removing flue 3 and the water-cooled cover plate 7. The water-cooled cover plate 7 is in a form of local water cooling and detachable, facilitating ash cleaning and maintenance.

[0036] The dust-removing flue 3 comprises a main flue 31 arranged above the refractory cover plate 2; the main flue 31 and the furnace cover body 1 are provided with an air inlet 4; the furnace cover body 1 is provided with a furnace door device 5 at the end away from the smoke outlet pipeline 13; and the main flue 31 and the furnace door device 5 are connected through a first auxiliary flue 32.

[0037] The furnace cover body 1 is further provided with a feeding pipe 10; and the main flue 31 is connected with the feeding pipe 10 through a second auxiliary flue 33. The nitrogen sealing device of the feeding pipe 10 is cancelled, and the suffocation hidden danger of the nitrogen sealing device is completely eliminated.

[0038] The furnace cover body 1 is composed of a plurality of water-cooled pipelines arranged side by side; and the furnace cover body 1 is further provided with a water distributor 12 connected with the water-cooled pipelines.

[0039] The furnace cover body 1 is further provided with a wire feeding port; and a wire feeding cover plate 11 is arranged on the wire feeding port.

[0040] The utility model cancels the traditional furnace cover lower skirt air suction, arranges two air inlets 4 between the furnace cover body 1 and the dust-removing flue 3, changes into the form of furnace cover upper top surface furnace air suction, and the flue gas enters the main flue 31 from the two air inlets 4, is discharged after entering the smoke outlet pipeline 13 from the main flue 31, and the problem that the skirt air inlet 4 is often blocked and difficult to clean is completely eliminated.

[0041] Finally, it is to be noted that the above examples are only used to illustrate the technical solutions of the utility model and not to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions, and all of them should be covered in the scope of the claims of the utility model.

Claims

1. A water-cooled cover for a ladle furnace, characterized by: The utility model relates to a furnace cover body (1), set up on the furnace cover body (1) refractory cover plate (2), the refractory cover plate (2) is provided with dust removal flue (3) away from one side of the furnace cover body (1), the furnace cover body (1) with dust removal flue (3) between through the air suction mouth (4) link to each other, the dust removal flue (3) is connected with the flue gas outlet pipeline (13), and the flue gas in the furnace is discharged from the flue gas outlet pipeline (13) through the air suction mouth (4), dust removal flue (3), the butt joint surface (14) between the dust removal flue (3) and flue gas outlet pipeline (13) is inclined plane, and the butt joint surface (14) is sealed through heat -resistant flexible material (8).

2. The water-cooled ladle furnace cover according to claim 1, characterized in that: The dust removal flue (3) includes the main flue (31) set up above the refractory cover plate (2), the main flue (31) with the furnace cover body (1) between being provided with air suction mouth (4), the furnace cover body (1) is provided with furnace door device (5) away from one end of the flue gas outlet pipeline (13), and the main flue (31) is connected with furnace door device (5) through first auxiliary flue (32).

3. The water cooled lid for a ladle furnace as claimed in claim 2, characterized in that: The furnace cover body (1) is also provided with the downcomer (10), and the main flue (31) is communicated with the downcomer (10) through second auxiliary flue (33).

4. The water cooled lid for a ladle furnace as claimed in claim 2, characterized in that: The dust removal flue (3) is provided with detachable water-cooled cover plate (7).

5. The water cooled ladle furnace cover according to claim 4, characterized in that: The water-cooled cover plate (7) partially covers the upper surface of the main flue (31) on the side close to the flue gas outlet pipeline (13) and is located above the air suction mouth (4).

6. The water cooled lid for a ladle furnace as claimed in claim 4, characterized in that: It also includes the knot material layer (6) arranged between the inner side of the dust removal flue (3) and the dust removal flue (3) and the water-cooled cover plate (7).

7. The water cooled lid for a ladle furnace as claimed in claim 1, characterized in that: The furnace cover body (1) is combined by a plurality of water-cooled pipelines arranged side by side, and the furnace cover body (1) is also provided with a water distributor (12) connected with the water-cooled pipelines.

8. The water cooled ladle furnace cover according to claim 1, characterized in that: The butt joint surface (14) is inclined towards the side of the flue gas outlet pipeline (13).

9. The water cooled ladle furnace cover according to claim 1, characterized in that: The heat-resistant flexible material (8) is arranged around the outer periphery of the butt joint surface (14).

10. The water cooled lid for a ladle furnace as claimed in claim 1, characterized in that: The furnace cover body (1) is also provided with a silk feeding port, and the silk feeding cover plate (11) is arranged on the silk feeding port.

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