Split type converter smoke hood structure

Abstract

The utility model provides a split type converter smoke hood structure which comprises a smoke hood connected with a converter mouth, the smoke hood comprises a fixed hood and a movable hood, the fixed hood and the movable hood respectively form an independent cooling loop, the fixed hood is connected to the converter mouth, the movable hood is detachably connected to the fixed hood, and the movable hood is detachably connected to the fixed hood. An outer layer heating surface and an inner layer heating surface are arranged on the inner wall of the fixed cover, a first annular inlet collecting box and a first annular outlet collecting box are fixed to the outer wall of the fixed cover, the movable cover comprises a straight barrel cover and an inclined cover, the inclined cover is obliquely fixed to the upper portion of the straight barrel cover, and the inclined cover is fixed to the lower portion of the fixed cover. The smoke hood is divided into two sections, namely the fixed hood and the movable hood, each section forms an independent cooling loop, the two sections are connected through a sand seal, a second annular inlet collecting box is installed at the end opening of the straight cylinder hood, a second annular outlet collecting box is installed at the end opening of the inclined hood, and a hood wall heating surface is arranged on the inner wall of the movable hood. And respective isolation maintenance and replacement are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of energy-saving boilers, in particular to a split converter smoke hood structure. Background Art

[0002] When oxygen is blown during converter smelting, carbon in the boiling molten iron reacts violently with oxygen to generate carbon monoxide and carbon dioxide flue gas. The reaction also releases a large amount of heat, causing the flue gas temperature to rise rapidly to 1600-1700℃. After leaving the converter furnace, the high-temperature flue gas passes through the collection hood and flue. The hood and flue are usually surrounded by steel pipes with water cooling. The steel pipes are welded to form a sealed structure. When the flue gas flows through the flue, its heat is transferred through the steel pipe wall to the water flowing in the pipe and taken away.

[0003] The steel pipe must be fully cooled to avoid being burned by high-temperature flue gas. Once the steel pipe is burned and leaks, the water leaking into the flue may flow into the ladle and encounter the high-temperature molten steel, causing an explosion and splashing of steel, damaging the converter and even causing personal accidents. Therefore, the reliability of the flue is of great significance.

[0004] The structure of the converter flue must be strictly sealed on the one hand to prevent CO smoke from leaking out and external air from being sucked into the flue, which will cause CO combustion and reduce its recovery rate. On the other hand, its structure must meet the needs of steelmaking technology, with a cooling system set up in sections, necessary oxygen gun ports, auxiliary oxygen gun ports, chute ports, manholes, inspection holes, etc. The flue pipes must withstand high-temperature flue gas and not be burned out during long-term use. Due to the frequent oxygen blowing and steel-making and charging of the converter, the flue gas is sometimes interrupted, and the flue pipes are frequently subjected to alternating thermal stresses, which places high demands on the material selection, welding, pipe bending, and combined processing of the flue.

[0005] The flue of a large steelmaking converter usually includes a skirt hood at the furnace mouth, a lower smoke hood, a straight smoke duct and an inclined curved smoke duct. Since the lower smoke hood at the furnace mouth operates in a bad condition, it is easy to burst and leak due to wear and poor cooling. Therefore, the present invention proposes a split converter smoke hood structure, which ensures the quality and reliability of the smoke hood through a unique structural form and manufacturing process. Utility Model Content

[0006] In order to solve the above technical problems, the utility model proposes a split converter smoke hood structure, which divides the smoke hood into two sections, a fixed hood and a movable hood, each section constitutes an independent cooling circuit, and the two sections are connected by sand sealing, which is convenient for isolation, maintenance and replacement.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A split converter smoke hood structure includes a smoke hood connected to a converter furnace port, characterized in that: the smoke hood includes a fixed hood and a movable hood, the fixed hood and the movable hood each constitute an independent cooling circuit, the fixed hood is connected to the converter furnace port, and the movable hood is detachably connected to the fixed hood.

[0009] An outer heating surface and an inner heating surface are arranged on the inner wall of the fixed cover. The inner heating surface and the outer heating surface are respectively made of seamless steel pipes, which are welded side by side. The outer heating surface and the inner heating surface are connected through a bend pipe. The upper diameter of the inner heating surface is smaller than the lower diameter. The upper diameter of the outer heating surface is smaller than the lower diameter. A first annular inlet header and a first annular outlet header are fixed on the outer wall of the fixed cover. The end of the outer heating surface is connected to the first annular inlet header, and the end of the inner heating surface is connected to the first annular outlet header. The first annular inlet header is provided with a first throttling device and a first inspection cover corresponding to each heating surface pipeline.

[0010] The movable cover comprises a straight cover and an inclined cover, wherein the inclined cover is tilted and fixed above the straight cover, an oxygen gun water jacket and an auxiliary oxygen gun water jacket are installed on the inclined cover, the oxygen gun water jacket faces the center of the converter furnace mouth, and a chute water jacket is installed oppositely on the straight cover, and the chute water jacket and the oxygen gun water jacket are located on the same vertical line.

[0011] A second annular inlet header is installed at the port of the straight hood, a second annular outlet header is installed at the port of the inclined hood, the movable hood is detachably connected to the first annular outlet header of the fixed hood through the second annular inlet header, and is connected to the straight flue through the second annular outlet header.

[0012] A hood wall heating surface is arranged on the inner wall of the movable hood, and the hood wall heating surface is a membrane wall structure welded by a seamless steel pipe and a second flat steel. A second throttling device and a second inspection cover corresponding to each heating surface tube are installed inside the second annular inlet header.

[0013] In the above structure: a split converter smoke hood structure proposed in the present application comprises a smoke hood connected to the converter furnace port, wherein the smoke hood comprises a fixed hood and a movable hood, the fixed hood and the movable hood each constitute an independent cooling circuit, the fixed hood is connected to the converter furnace port, and the movable hood is detachably connected to the fixed hood, and can be isolated, maintained and replaced respectively when necessary;

[0014] The fixed hood is a circular smoke hood about 1 meter high fixed above the converter furnace mouth. The inner wall of the fixed hood is provided with a heating surface. The heating surface is made of seamless steel pipes, which are welded side by side. It is divided into two layers, inner and outer, respectively, the inner heating surface and the outer heating surface. The two heating surfaces are connected by a bend pipe. The end of the outer heating surface is connected to the first annular inlet header, and the end of the inner layer is connected to the first annular outlet header. The upper diameter of the inner heating surface is small and the lower diameter is large, that is, the inner heating surface is in a shape of about 1° taper with a small upper diameter and a large lower diameter, which is conducive to the free fall of the ash splashed on the tube and does not affect the cooling of the heating surface tube. The upper diameter of the outer heating surface is small and the lower diameter is large, and it also has a certain taper with a small upper diameter and a large lower diameter, so as to adapt to better sealing with the fixed hood when the skirt hood is lowered;

[0015] The first annular inlet header is provided with a first throttling device and a first inspection cover corresponding to each heating surface pipeline, and the first annular outlet header is provided with a sand sealing groove for connecting with the movable cover.

[0016] The movable hood is installed on the upper part of the fixed hood. The movable hood includes a straight hood and an inclined hood. The inclined hood is tilted and fixed above the straight hood. A second annular inlet header is installed at the port of the straight hood. A second annular outlet header is installed at the port of the inclined hood. The movable hood is detachably connected to the first annular outlet header of the fixed hood through the second annular inlet header, which is convenient for smoke circulation and connected to the straight flue through the second annular outlet header.

[0017] A heating surface of the hood wall is arranged on the inner wall of the movable hood. The heating surface of the hood wall is a membrane wall structure welded by seamless steel pipe and flat steel with a width of 10-12mm. The inclination angle of the inclined hood to the horizontal plane is about 50°, thus leaving space for the installation of the oxygen gun water jacket and the auxiliary oxygen gun water jacket.

[0018] The second annular inlet header is provided with a second throttling device and a second inspection cover corresponding to each heating surface tube; the second annular outlet header is provided with a connecting flange, which is connected and fixed to the straight flue through the connecting flange;

[0019] An oxygen lance water jacket is provided above the inclined cover directly facing the center of the converter furnace mouth, an auxiliary oxygen lance water jacket is provided obliquely above the oxygen lance water jacket, and a chute water jacket is provided on each of the left and right sides of the straight cover;

[0020] A spoiler is installed inside the pipe on the lower side of the connection between the straight hood and the inclined hood, and the outer surface is welded with wear-resistant alloy to reduce the wear and cooling problems of the lower pipe of the smoke hood, which is most likely to occur.

[0021] Further: a sand sealing groove is installed on the first annular outlet header, and a sand sealing plug is installed on the second annular inlet header. The sand sealing plug is inserted into the sand sealing groove to realize the detachable installation of the movable cover on the fixed cover.

[0022] In the above structure, the fixed cover and the movable cover are connected and fixed by the sand sealing insert and the sand sealing groove. When the movable cover needs to be disassembled, the sand sealing insert can be taken out.

[0023] Furthermore: it also includes a skirt cover, which is arranged at the connection between the fixed cover and the converter furnace mouth and can move up and down along the outer heating surface of the fixed cover.

[0024] In the above structure: the skirt cover is used to achieve sealing and fixation between the converter furnace mouth and the fixed cover. The upper diameter of the outer heating surface of the fixed cover is small, and the lower diameter is large. It has a certain taper shape with a small top and a large bottom, so as to facilitate better sealing with the fixed cover when the skirt cover is lowered.

[0025] Further: it also includes an annular support beam and a support arm, a groove is formed between the first annular inlet header and the first annular outlet header, the annular support beam is installed in the groove, the support arms are respectively fixed on the annular support beam, and the support arms are respectively fixed on the factory platform.

[0026] In the above structure: the annular support beam and the support arm are used to fix the fixed cover. The annular support beam is installed in the groove formed by the first annular inlet header and the first annular outlet header, so as to fix the fixed cover. Then, the annular support beam is fixed on the plant platform through the external support arm.

[0027] Furthermore: the seamless steel pipes on the outer heating surface are respectively welded and sealed by the first flat steel.

[0028] In the above structure: strictly ensuring the geometric shape and size of the fixed cover is a prerequisite for the normal installation and operation of the fixed cover. Since all the tubes of the fixed cover need to be welded together to seal, the welding shrinkage and deformation are large, so a special manufacturing process is required to overcome these manufacturing difficulties.

[0029] Further: the outer wall of the movable cover is provided with a secondary gun opening bifurcated pipe, an oxygen gun opening bifurcated pipe and a chute opening bifurcated pipe, and the secondary gun opening bifurcated pipe, the oxygen gun opening bifurcated pipe and the chute opening bifurcated pipe are respectively connected to the secondary oxygen gun water jacket, the oxygen gun water jacket and the chute water jacket.

[0030] In the above structure: the auxiliary lance opening bifurcated pipe, the oxygen lance opening bifurcated pipe and the chute opening bifurcated pipe will be connected with the corresponding auxiliary oxygen lance water jacket, the oxygen lance water jacket and the chute water jacket to ensure the connection matching size.

[0031] Furthermore: it also includes a first support frame and a second support frame, the inclined cover is fixed on the mobile trolley through the first support frame, and the straight cover is fixed on the mobile trolley through the second support frame.

[0032] In the above structure: the movable cover is supported by the first support frame and the second support frame and sits on the movable trolley respectively. When the converter needs to repair the refractory material of the lining, the flanges at both ends of the movable cover are disassembled, and the movable cover is removed to vacate the space above the fixed cover for lifting and operating the refractory material for furnace repair.

[0033] Further: a connecting flange is installed on the second annular outlet header, and the movable hood is fixedly connected to the straight flue through the connecting flange.

[0034] In the above structure: the connecting flange is used to realize the connection and fixation between the movable hood and the straight flue.

[0035] Furthermore: the inclination angle between the inclined cover and the straight cover is 40 degrees.

[0036] Compared with the prior art, the beneficial effects of the utility model are:

[0037] The split hood is divided into two sections: a fixed hood and a movable hood. Each section constitutes an independent cooling circuit. The two sections are connected by sand sealing to facilitate isolation, maintenance and replacement.

[0038] The fixed cover adopts tube-to-tube sealing welding, and the fixed cover undergoes overall annealing heat treatment, which increases the reliability and life of the use;

[0039] The outer side of the flue gas pipe at the lower part of the mobile cover turning point is welded and the inner side of the pipe is equipped with a spoiler, which greatly enhances the durability of the climbing section, improves the wear resistance of the pipe, accelerates the cooling of the pipe, and effectively protects the vulnerable parts of the mobile cover;

[0040] For the tube-to-tube sealed welding structure, the tube segments are first manufactured and welded, and then assembled and sealed. The size and welding quality can be guaranteed, thereby effectively ensuring the overall structural size and product quality required by the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of this application;

[0042] Figure 2 is a cross-sectional view of a fixed cover in the present application;

[0043] Figure 3 It is the welding diagram of the heating surface tube in this application;

[0044] Figure 4 is a cross-sectional view of the mobile cover in the present application;

[0045] Figure 5 It is the welding diagram of the heating surface tube in this application;

[0046] Figure 6 It is a schematic diagram of the surfacing arrangement and spoiler arrangement in this application.

[0047] List of reference numerals:

[0048] 1. Converter furnace mouth; 2. Skirt cover; 3. Fixed cover; 31. First annular inlet header; 311. First throttling device; 312. First inspection cover; 32. First annular outlet header; 321. Sand sealing groove; 33. Inner heating surface; 331. Outer heating surface; 332. Bend pipe; 333. First flat steel; 34. Annular support beam; 341. Support arm; 4. Moving cover; 41. Second annular inlet header; 411. Second section Flow device; 412, second inspection cover; 413, sand sealing plug plate; 42, second annular outlet header; 421, connecting flange; 43, hood wall heating surface; 431, second flat steel; 44, reinforcement ring; 45, first support frame; 46, second support frame; 5, chute water jacket; 51, chute opening bifurcation pipe; 6, oxygen gun water jacket; 61, oxygen gun opening bifurcation pipe; 7, auxiliary oxygen gun water jacket; 71, auxiliary gun opening bifurcation pipe; 8, straight flue. DETAILED DESCRIPTION

[0049] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementations:

[0050] like Figure 1-6 As shown, the present invention proposes a split converter smoke hood structure, including a smoke hood connected to a converter furnace port 1, the smoke hood including a fixed hood 3 and a movable hood 4, the fixed hood 3 and the movable hood 4 each forming an independent cooling circuit, the fixed hood 3 connected to the converter furnace port 1, the movable hood 4 detachably connected to the fixed hood 3,

[0051] An outer heating surface 331 and an inner heating surface 33 are arranged on the inner wall of the fixed cover 3. The inner heating surface 33 and the outer heating surface 331 are respectively made of seamless steel pipes, which are welded side by side. The outer heating surface 331 and the inner heating surface 33 are connected through a bend pipe 332. The upper diameter of the inner heating surface 33 is smaller than the lower diameter, and the upper diameter of the outer heating surface 331 is smaller than the lower diameter. A first annular inlet header 31 and a first annular outlet header 32 are fixed on the outer wall of the fixed cover 3. The end of the outer heating surface 331 is connected to the first annular inlet header 31, and the end of the inner heating surface 33 is connected to the first annular outlet header 32. The first annular inlet header 31 is equipped with a first throttling device 311 and a first inspection cover 312 corresponding to each heating surface pipeline.

[0052] The movable cover 4 includes a straight cover and an inclined cover, the inclined cover is tilted and fixed above the straight cover, an oxygen gun water jacket 6 and an auxiliary oxygen gun water jacket 7 are installed on the inclined cover, the oxygen gun water jacket 6 is directly opposite to the center of the converter furnace mouth 1, and a chute water jacket 5 is installed opposite to the straight cover, the chute water jacket 5 and the oxygen gun water jacket 6 are located on the same vertical line,

[0053] A second annular inlet header 41 is installed at the port of the straight hood, and a second annular outlet header 42 is installed at the port of the inclined hood. The movable hood 4 is detachably connected to the first annular outlet header 32 of the fixed hood 3 through the second annular inlet header 41, and is connected to the straight flue 8 through the second annular outlet header 42.

[0054] A hood wall heating surface 43 is arranged on the inner wall of the movable hood 4. The hood wall heating surface 43 is a membrane wall structure welded by a seamless steel pipe and a second flat steel 431. The second annular inlet header 41 is internally provided with a second throttling device 411 and a second inspection cover 412 corresponding to each heating surface tube.

[0055] The present application proposes a split converter smoke hood structure, comprising a smoke hood connected to a converter furnace port 1, wherein the smoke hood comprises a fixed hood 3 and a movable hood 4, wherein the fixed hood 3 and the movable hood 4 each constitute an independent cooling circuit, wherein the fixed hood 3 is connected to the converter furnace port 1, and the movable hood 4 is detachably connected to the fixed hood 3, and can be isolated, maintained and replaced respectively when necessary;

[0056] The fixed hood 3 is a circular smoke hood fixed at a height of about 1 meter above the converter furnace mouth 1. The inner wall of the fixed hood 3 is provided with a heating surface. The heating surface is made of seamless steel pipes, which are welded side by side and are divided into two layers, namely, an inner heating surface 33 and an outer heating surface 331. The two heating surfaces are connected by a bend pipe 332. The end of the outer heating surface 331 is connected to the first annular inlet header 31, and the end of the inner layer is connected to the first annular outlet header 32. The upper diameter of the inner heating surface 33 is small and the lower diameter is large, that is, the inner heating surface 33 is in a shape of about 1° taper with a small upper diameter and a large lower diameter, which is conducive to the free fall of the ash splashed on the tube without affecting the cooling of the heating surface tube. The upper diameter of the outer heating surface 331 is small and the lower diameter is large, and it also has a certain taper with a small upper diameter and a large lower diameter, so as to adapt to better sealing with the fixed hood 3 when the skirt hood 2 is lowered;

[0057] The first annular inlet header 31 is provided with a first throttling device 311 and a first inspection cover 312 corresponding to each heating surface pipeline, and the first annular outlet header 32 is provided with a sand sealing groove 321 for connecting with the movable cover 4.

[0058] The movable hood 4 is installed on the upper part of the fixed hood 3. The movable hood 4 includes a straight hood and an inclined hood. The inclined hood is tilted and fixed above the straight hood. The tilt angle between the inclined hood and the straight hood is 40 degrees. A second annular inlet header 41 is installed at the port of the straight hood. A second annular outlet header 42 is installed at the port of the inclined hood. The movable hood 4 is detachably connected to the first annular outlet header 32 of the fixed hood 3 through the second annular inlet header 41 to facilitate smoke circulation. The movable hood 4 is connected to the straight flue 8 through the second annular outlet header 42.

[0059] A hood wall heating surface 43 is provided on the inner wall of the movable hood 4. The hood wall heating surface 43 is a membrane wall structure welded by a seamless steel pipe and a flat steel with a width of 10-12 mm. The inclination angle of the inclined hood to the horizontal plane is about 50°, thereby leaving space for the installation of the oxygen gun water jacket 6 and the auxiliary oxygen gun water jacket 7.

[0060] The second annular inlet header 41 is provided with a second throttling device 411 and a second inspection cover 412 corresponding to each heating surface tube; the second annular outlet header 42 is provided with a connecting flange 421, which is connected and fixed to the straight flue 8 via the connecting flange 421;

[0061] An oxygen lance water jacket 6 is provided above the inclined cover directly facing the center of the converter furnace mouth 1, and an auxiliary oxygen lance water jacket 7 is provided obliquely above the oxygen lance water jacket 6. A chute water jacket 5 is also provided on the left and right sides of the straight cover respectively.

[0062] A spoiler is installed inside the pipe on the lower side of the connection between the straight hood and the inclined hood, and the outer surface is welded with wear-resistant alloy to reduce the wear and cooling problems of the lower pipe of the smoke hood, which is most likely to occur.

[0063] In this embodiment: a sand sealing groove 321 is installed on the first annular outlet header 32, and a sand sealing plug 413 is installed on the second annular inlet header 41. The sand sealing plug 413 is inserted into the sand sealing groove 321 to realize the detachable installation of the movable cover 4 on the fixed cover 3. The fixed cover 3 and the movable cover 4 are connected and fixed by the sand sealing plug 413 and the sand sealing groove 321. When the movable cover 4 needs to be disassembled, the sand sealing plug 413 can be taken out.

[0064] In this embodiment, a skirt cover 2 is also included, which is arranged at the connection between the fixed cover 3 and the converter furnace mouth 1 and can move up and down along the outer heating surface 331 of the fixed cover 3. The skirt cover 2 is used to achieve sealing and fixing between the converter furnace mouth 1 and the fixed cover 3. The outer heating surface 331 of the fixed cover 3 has a small diameter at the upper end and a large diameter at the lower end, and is in a shape with a certain taper, which is small at the upper end and large at the lower end, so as to facilitate the sealing between the skirt cover 2 and the fixed cover 3 when the cover is lowered.

[0065] In this embodiment: it also includes an annular support beam 34 and a support arm 341. A groove is formed between the first annular inlet header 31 and the first annular outlet header 32. The annular support beam 34 is installed in the groove. The support arms 341 are respectively fixed on the annular support beam 34. The support arms 341 are respectively fixed on the plant platform. The annular support beam 34 and the support arm 341 are used to fix the fixed cover 3. The annular support beam 34 is installed in the groove formed by the first annular inlet header 31 and the first annular outlet header 32, so as to fix the fixed cover 3. Then, the annular support beam 34 is fixed on the plant platform through the external support arm 341.

[0066] In this embodiment, the seamless steel pipes on the outer heating surface 331 are welded and sealed respectively by the first flat steel 333. Strictly ensuring the geometric shape and size of the fixed cover 3 is a prerequisite for the normal installation and operation of the fixed cover 3. Since all the pipes of the fixed cover 3 need to be welded together to play a sealing role, the welding shrinkage and deformation are large, so a special manufacturing process is required to overcome these manufacturing difficulties.

[0067] In this embodiment: the outer wall of the mobile cover 4 is provided with a secondary lance opening bifurcated pipe 71, an oxygen lance opening bifurcated pipe 61 and a chute opening bifurcated pipe 51, which are respectively connected to the secondary oxygen lance water jacket 7, the oxygen lance water jacket 6 and the chute water jacket 5. The secondary lance opening bifurcated pipe 71, the oxygen lance opening bifurcated pipe 61 and the chute opening bifurcated pipe 51 are connected to the corresponding secondary oxygen lance water jacket 7, the oxygen lance water jacket 6 and the chute water jacket 5 to ensure the size of the connection fit.

[0068] In this embodiment, it also includes a first support frame 45 and a second support frame 46. The inclined cover is fixed on the moving trolley through the first support frame 45, and the straight cover is fixed on the moving trolley through the second support frame 46. The moving cover 4 is supported by the first support frame 45 and the second support frame 46 and sits on the moving trolley respectively. When the converter needs to repair the refractory material of the furnace lining, the flanges at both ends of the moving cover 4 are disassembled, and the moving cover 4 is removed to vacate the space above the fixed cover 3 for hoisting and operating the refractory material for furnace repair.

[0069] In this embodiment: a connecting flange 421 is installed on the second annular outlet header 42, and the moving hood 4 is fixedly connected to the straight flue 8 via the connecting flange 421. The connecting flange 421 is used to realize the connection and fixation between the moving hood 4 and the straight flue 8.

[0070] The present application sets the smoke hood as a split smoke hood, which is divided into two sections, a fixed hood 3 and a movable hood 4, each section constitutes an independent cooling circuit, and the two sections are connected by sand sealing, which is convenient for isolation maintenance and replacement;

[0071] The fixed cover 3 adopts tube-to-tube sealing welding, and the fixed cover 3 undergoes overall annealing heat treatment, which increases the reliability and life of the use;

[0072] The outer side of the flue gas side pipe at the lower part of the turning point of the mobile cover 4 is welded and the inner side of the pipe is provided with a spoiler, which greatly enhances the durability of the climbing section, improves the wear resistance of the pipe, accelerates the cooling of the pipe, and effectively protects the vulnerable parts of the mobile cover 4;

[0073] For the tube-to-tube sealed welding structure, the tube segments are first manufactured and welded, and then assembled and sealed. The size and welding quality can be guaranteed, thereby effectively ensuring the overall structural size and product quality required by the drawings.

[0074] The above is only a preferred embodiment of the present invention and does not constitute any other limitation on the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A split converter smoke hood structure, comprising a smoke hood connected to a converter furnace port (1), characterized in that: The smoke hood comprises a fixed hood (3) and a movable hood (4), wherein the fixed hood (3) and the movable hood (4) each constitute an independent cooling circuit, the fixed hood (3) is connected to the converter furnace mouth (1), and the movable hood (4) is detachably connected to the fixed hood (3). An outer heating surface (331) and an inner heating surface (33) are arranged on the inner wall of the fixed cover (3); the inner heating surface (33) and the outer heating surface (331) are respectively formed by welding seamless steel pipes in parallel; the outer heating surface (331) and the inner heating surface (33) are connected via a bend pipe (332); the upper diameter of the inner heating surface (33) is smaller than the lower diameter; the upper diameter of the outer heating surface (331) is smaller than the lower diameter. The fixed cover (3) has a first annular inlet header (31) and a first annular outlet header (32) fixed on its outer wall, the end of the outer heating surface (331) is connected to the first annular inlet header (31), the end of the inner heating surface (33) is connected to the first annular outlet header (32), and the first annular inlet header (31) is provided with a first throttling device (311) and a first inspection cover (312) corresponding to each heating surface pipeline; The movable cover (4) comprises a straight cover and an inclined cover, wherein the inclined cover is tilted and fixed above the straight cover, an oxygen gun water jacket (6) and an auxiliary oxygen gun water jacket (7) are installed on the inclined cover, the oxygen gun water jacket (6) is directly opposite to the center of the converter furnace mouth (1), and a chute water jacket (5) is installed opposite to the straight cover, and the chute water jacket (5) and the oxygen gun water jacket (6) are located on the same vertical line. A second annular inlet header (41) is installed at the port of the straight hood, a second annular outlet header (42) is installed at the port of the inclined hood, the movable hood (4) is detachably connected to the first annular outlet header (32) of the fixed hood (3) via the second annular inlet header (41), and is connected to the straight flue (8) via the second annular outlet header (42). A hood wall heating surface (43) is arranged on the inner wall of the movable hood (4), and the hood wall heating surface (43) is a membrane wall structure welded by a seamless steel pipe and a second flat steel (431). A second throttling device (411) and a second inspection cover (412) corresponding to each heating surface tube are installed inside the second annular inlet header (41).

2. The split converter smoke hood structure according to claim 1, characterized in that: The first annular outlet header (32) is provided with a sand sealing groove (321), and the second annular inlet header (41) is provided with a sand sealing plug plate (413), and the sand sealing plug plate (413) is inserted into the sand sealing groove (321) to achieve detachable installation of the movable cover (4) on the fixed cover (3).

3. The split converter smoke hood structure according to claim 1 is characterized in that: It also comprises a skirt cover (2), which is arranged at the connection between the fixed cover (3) and the converter furnace mouth (1) and can move up and down along the outer heating surface (331) of the fixed cover (3).

4. The split converter smoke hood structure according to claim 1 is characterized in that: It also includes an annular support beam (34) and a support arm (341); a groove is formed between the first annular inlet header (31) and the first annular outlet header (32); the annular support beam (34) is installed in the groove; the support arms (341) are respectively fixed on the annular support beam (34); and the support arms (341) are respectively fixed on the plant platform.

5. The split converter smoke hood structure according to claim 1 is characterized in that: The seamless steel pipes on the outer heating surface (331) are respectively welded and sealed by first flat steels (333).

6. The split converter smoke hood structure according to claim 1, characterized in that: The outer wall of the movable cover (4) is provided with a secondary lance opening bifurcated pipe (71), an oxygen lance opening bifurcated pipe (61) and a chute opening bifurcated pipe (51); the secondary lance opening bifurcated pipe (71), the oxygen lance opening bifurcated pipe (61) and the chute opening bifurcated pipe (51) are respectively connected to the secondary oxygen lance water jacket (7), the oxygen lance water jacket (6) and the chute water jacket (5).

7. The split converter smoke hood structure according to claim 1, characterized in that: It also comprises a first support frame (45) and a second support frame (46), wherein the inclined cover is fixed on the moving trolley via the first support frame (45), and the straight cover is fixed on the moving trolley via the second support frame (46).

8. The split converter smoke hood structure according to claim 1, characterized in that: A connecting flange (421) is installed on the second annular outlet header (42), and the movable cover (4) is fixedly connected to the straight flue (8) via the connecting flange (421).

9. The split converter smoke hood structure according to claim 1, characterized in that: The inclination angle between the inclined cover and the straight cover is 40 degrees.

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