Special filtering equipment for oxidation system of maleic anhydride device
Through the design of the internal and external heating box structure, the problem of uneven heating of the fixed bed reactor is solved, and more efficient heating effect is achieved and the working efficiency of the reactor is improved.
Patent Information
- Application Number
- CN202420258171.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-02
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-02-02
AI Technical Summary
The existing fixed bed reactors are heated unevenly, resulting in inefficient work.
The internal and external heating box structure is adopted. The internal heating box is heated from the inside to the outside through the inner heating pipe, and the outer annular heating box is heated from the outside to the inside through the outer heating pipe to achieve heating uniformity.
The heating uniformity of the fixed bed reactor is improved, thereby improving working efficiency.
Smart Images
Figure CN223096747U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fixed bed reactors, in particular to a special filtering device for an oxidation system of a maleic anhydride device. Background Art
[0002] In the oxidation system of a maleic anhydride device, a fixed bed reactor is used. A fixed bed reactor refers to a reactor filled with granular solid catalysts or solid reactants to form a stacked bed layer of a certain height. While gas or liquid materials flow through the gaps between the particles and pass through the stationary fixed bed layer, a heterogeneous reaction process is realized. The characteristic of this type of reactor is that the solid particles filled in the equipment are stationary, which is different from the moving bed and fluidized bed where solid materials move in the equipment, and it is also called a packed bed reactor. Fixed bed reactors are widely used in gas-solid phase reactions and liquid-solid phase reaction processes. For example, the fixed semi-water gas generator in the synthetic ammonia industry, the fixed bed ion exchange column in water treatment, etc.
[0003] However, the existing fixed bed reactor is only heated from the outside, resulting in uneven heating of the fixed bed layer and reducing the working efficiency of the fixed bed reactor. Summary of the Utility Model
[0004] The utility model provides a special filtering device for an oxidation system of a maleic anhydride device.
[0005] To achieve the above object, the utility model adopts the following technical solutions:
[0006] A special filtering device for the oxidation system of a maleic anhydride plant, comprising a fixed-bed reactor, a first gas cooler, and a second gas cooler. The fixed-bed reactor, the first gas cooler, and the second gas cooler are connected by pipelines. A filtering device is installed at the bottom of the second gas cooler. The filtering device includes a primary filtering device, a secondary filtering device, and a tertiary filtering device. The primary filtering device, the secondary filtering device, and the tertiary filtering device are arranged in sequence from the inside out. The fixed-bed reactor includes an inner heating box, inner heating tubes, inner clamping frames, a support bottom plate, support fine frames, support legs, a discharge pipe, a fixing ring, a fixed-bed layer, a reactor cylinder, a reactor end cover, a feed hopper, strip-shaped holes, an outer annular heating box, outer heating tubes, and outer clamping frames. A reactor end cover is provided at the upper end of the reactor cylinder. The left and right ends of the reactor end cover are fixedly connected to the upper end of the reactor cylinder by bolts. A support bottom plate is provided in the reactor cylinder. A number of support fine frames are provided at the lower end of the support bottom plate. The upper ends of the support fine frames are fixedly connected to the lower end of the support bottom plate, and the lower ends of the support fine frames are fixedly connected to the inner wall of the reactor cylinder. An inner heating box is provided at the upper end of the support bottom plate. The inner heating box is in the shape of a hollow cylinder. The lower end of the inner heating box is fixedly connected to the upper end of the support bottom plate. A number of inner heating tubes are provided in the inner heating box. The number of inner heating tubes is evenly distributed in the inner heating box in an array with the central axis of the inner heating box as the axis. A pair of inner clamping frames is symmetrically provided above and below the number of inner heating tubes. The outer ends of the inner clamping frames are fixedly connected to the inner wall of the inner heating box. The number of inner heating tubes is fixedly connected to the inner clamping frames. An outer annular heating box is provided outside the reactor cylinder. The outer annular heating box is in the shape of a hollow circular ring with a square cross-section. The inner ring of the outer annular heating box is fixedly connected to the outside of the reactor cylinder. A number of outer heating tubes are provided in the outer annular heating box. The number of outer heating tubes is evenly distributed in the outer annular heating box in an annular array with the central axis of the outer annular heating box as the axis. A pair of outer clamping frames is symmetrically provided above and below the outer heating tubes. The outer heating tubes are fixedly connected to the outer clamping frames. The inner ends of the outer clamping frames are fixedly connected to the outer wall of the reactor cylinder.
[0007] Further, a feed hopper is provided at the upper end of the reactor end cover and is fixedly connected to the upper end of the reactor end cover. A number of strip-shaped holes are provided in the lower half of the feed hopper. The strip-shaped holes are evenly distributed in an array in the lower half of the feed hopper. The lower end of the feed hopper is fixedly connected to the upper end of the inner heating box. The feed hopper and the inner heating box are coaxially arranged.
[0008] Further, a number of fixing rings are provided in the reactor cylinder. The number of fixing rings is evenly distributed from top to bottom in the reactor cylinder. The outer ends of the number of fixing rings are all fixedly connected to the inner side wall of the reactor cylinder. A number of fixed-bed layers are provided in the number of fixing rings. The fixed-bed layers are clamped between two adjacent ones. The fixed-bed layers and the inner heating box and the reactor cylinder are coaxially arranged.
[0009] Furthermore, a discharge pipe is provided at the lower end of the reactor cylinder body. The discharge pipe is fixed and communicated with the lower end of the reactor cylinder body, and the discharge pipe is coaxially arranged with the reactor cylinder body.
[0010] Furthermore, a plurality of support legs are provided at the lower end of the reactor cylinder body. The plurality of support legs are uniformly distributed in a circular array around the central axis of the reactor cylinder body at the lower end of the reactor cylinder body, and the upper ends of the plurality of support legs are fixedly connected to the lower end of the reactor cylinder body.
[0011] Beneficial effects: In the present utility model, an internal heating box is arranged in the reactor cylinder body. Through the internal heating pipes in the internal heating box, heating is carried out from the inside to the outside of the reactor cylinder body, and through the external heating pipes in the external annular heating box outside the reactor cylinder body, heating is carried out from the outside to the inside of the reactor cylinder body. The two heating boxes work synchronously, making the heating of the fixed bed layer more uniform, thereby improving the working efficiency of the fixed bed reactor. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 is a schematic diagram of the overall structure of the present utility model;
[0013] Figure 2 is a schematic diagram of the structure of the filtration device in the present utility model;
[0014] 1 Fixed bed reactor, 2 First gas cooler, 3 Second gas cooler, 4 Filtration device, 5 Primary filtration device, 6 Secondary filtration device, 7 Tertiary filtration device, 8 Internal heating box, 9 Internal heating pipe, 10 Internal clamping frame, 11 Support bottom plate, 12 Support fine frame, 13 Support leg, 14 Discharge pipe, 15 Fixed ring, 16 Fixed bed layer, 17 Reactor cylinder body, 18 Reactor end cover, 19 Feed funnel, 20 Striped hole, 21 External annular heating box, 22 External heating pipe, 23 External clamping frame. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.
[0016] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.
[0017] Refer toFigure 1-2 , a special filtering device for the oxidation system of a maleic anhydride plant, comprising a fixed-bed reactor 1, a first gas cooler 2 and a second gas cooler 3. The fixed-bed reactor 1, the first gas cooler 2 and the second gas cooler 3 are connected by pipelines. A filtering device 4 is installed at the bottom of the second gas cooler 3. The filtering device 4 includes a primary filtering device 5, a secondary filtering device 6 and a tertiary filtering device 7. The primary filtering device 5, the secondary filtering device 6 and the tertiary filtering device 7 are arranged in sequence from the inside to the outside. The fixed-bed reactor 1 includes an internal heating box 8, internal heating tubes 9, an internal clamping frame 10, a support bottom plate 11, a support thin frame 12, support legs 13, a discharge pipe 14, a fixing ring 15, a fixed-bed layer 16, a reactor cylinder 17, a reactor end cover 18, a feed hopper 19, strip-shaped holes 20, an external annular heating box 21, external heating tubes 22 and an external clamping frame 23. A reactor end cover 18 is provided at the upper end of the reactor cylinder 17. The left and right ends of the reactor end cover 18 are fixedly connected to the upper end of the reactor cylinder 17 by bolts. A support bottom plate 11 is provided in the reactor cylinder 17. A plurality of support thin frames 12 are provided at the lower end of the support bottom plate 11. The upper end of the support thin frame 12 is fixedly connected to the lower end of the support bottom plate 11. The lower end of the support thin frame 12 is fixedly connected to the inner wall of the reactor cylinder 17. An internal heating box 8 is provided at the upper end of the support bottom plate 11. The internal heating box 8 is in the shape of a hollow cylinder. The lower end of the internal heating box 8 is fixedly connected to the upper end of the support bottom plate 11. A plurality of internal heating tubes 9 are provided in the internal heating box 8. The plurality of internal heating tubes 9 are uniformly distributed in the internal heating box 8 in an array with the central axis of the internal heating box 8 as the axis. A pair of internal clamping frames 10 are symmetrically provided above and below the plurality of internal heating tubes 9. The outer end of the internal clamping frame 10 is fixedly connected to the inner wall of the internal heating box 8. The plurality of internal heating tubes 9 are all fixedly connected to the internal clamping frame 10. An external annular heating box 21 is provided outside the reactor cylinder 17. The external annular heating box 21 is in the shape of a hollow circular ring with a square cross-section. The inner ring of the external annular heating box 21 is fixedly connected to the outside of the reactor cylinder 17. A plurality of external heating tubes 22 are provided in the external annular heating box 21. The plurality of external heating tubes 22 are uniformly distributed in the external annular heating box 21 in an annular array with the central axis of the external annular heating box 21 as the axis. A pair of external clamping frames 23 are symmetrically provided above and below the external heating tubes 22. The external heating tubes 22 are fixedly connected to the external clamping frames 23. The inner side end of the external clamping frame 23 is fixedly connected to the outer wall of the reactor cylinder 17.
[0018] A feed hopper 19 is provided at the upper end of the reactor end cover 18 and is fixedly connected to the upper end of the reactor end cover 18. A plurality of strip-shaped holes 20 are provided in the lower half of the feed hopper 19. The strip-shaped holes 20 are uniformly distributed in an array in the lower half of the feed hopper 19. The lower end of the feed hopper 19 is fixedly connected to the upper end of the internal heating box 8. The feed hopper 19 and the internal heating box 8 are coaxially arranged.
[0019] A number of fixed rings 15 are provided in the reactor cylinder body 17. The number of fixed rings 15 are evenly distributed from top to bottom in the reactor cylinder body 17. The outer ends of the number of fixed rings 15 are fixedly connected to the inner side wall of the reactor cylinder body 17. A number of fixed bed layers 16 are provided in the number of fixed rings 15. The fixed bed layer 16 is clamped between two adjacent ones. The fixed bed layer 16 is coaxially arranged with the inner heating box 8 and the reactor cylinder body 17.
[0020] A discharge pipe 14 is provided at the lower end of the reactor cylinder body 17. The discharge pipe 14 is fixedly connected and communicated with the lower end of the reactor cylinder body 17. The discharge pipe 14 is coaxially arranged with the reactor cylinder body 17.
[0021] A number of support legs 13 are provided at the lower end of the reactor cylinder body 17. The number of support legs 13 are evenly distributed in a circular array around the central axis of the reactor cylinder body 17 at the lower end of the reactor cylinder body 17. The upper ends of the number of support legs 13 are fixedly connected to the lower end of the reactor cylinder body 17.
[0022] Working principle:
[0023] By arranging the inner heating box 8 in the reactor cylinder body 17, through the inner heating pipes 9 in the inner heating box 8, heating is carried out from the inside to the outside of the reactor cylinder body 17, and through the outer heating pipes 22 in the outer annular heating box 21 outside the reactor cylinder body 17, heating is carried out from the outside to the inside of the reactor cylinder body 17. The two heating boxes work synchronously, making the heating of the fixed bed layer 16 more uniform, thereby improving the working efficiency of the fixed bed reactor 1.
[0024] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.
Claims
1. A special filtering device for the oxidation system of a maleic anhydride plant, characterized in that: It includes a fixed-bed reactor (1), a first gas cooler (2) and a second gas cooler (3). The fixed-bed reactor (1), the first gas cooler (2) and the second gas cooler (3) are connected by pipelines. A filtering device (4) is installed at the bottom of the second gas cooler (3). The filtering device (4) includes a primary filtering device (5), a secondary filtering device (6) and a tertiary filtering device (7). The primary filtering device (5), the secondary filtering device (6) and the tertiary filtering device (7) are arranged in sequence from the inside to the outside. The fixed-bed reactor (1) includes an internal heating box (8), internal heating tubes (9), an internal clamping frame (10), a support bottom plate (11), support fine frames (12), support legs (13), a discharge pipe (14), a fixing ring (15), a fixed bed layer (16), a reactor cylinder (17), a reactor end cover (18), a feed funnel (19), a strip-shaped hole (20), an outer annular heating box (21), outer heating tubes (22) and an outer clamping frame (23). A reactor end cover (18) is provided at the upper end of the reactor cylinder (17). The left and right ends of the reactor end cover (18) are fixedly connected to the upper end of the reactor cylinder (17) by bolts. A support bottom plate (11) is provided in the reactor cylinder (17). A number of support fine frames (12) are provided at the lower end of the support bottom plate (11). The upper ends of the support fine frames (12) are fixedly connected to the lower end of the support bottom plate (11). The lower ends of the support fine frames (12) are fixedly connected to the inner wall of the reactor cylinder (17). An internal heating box (8) is provided at the upper end of the support bottom plate (11). The internal heating box (8) is in the shape of a hollow cylinder. The lower end of the internal heating box (8) is fixedly connected to the upper end of the support bottom plate (11). A number of internal heating tubes (9) are provided in the internal heating box (8). The number of internal heating tubes (9) is evenly distributed in the internal heating box (8) in an array shape with the central axis of the internal heating box (8) as the axis. A pair of internal clamping frames (10) are symmetrically provided above and below the number of internal heating tubes (9). The outer ends of the internal clamping frames (10) are fixedly connected to the inner wall of the internal heating box (8). The number of internal heating tubes (9) are all fixedly connected to the internal clamping frames (10). An outer annular heating box (21) is provided outside the reactor cylinder (17). The outer annular heating box (21) is in the shape of a hollow circular ring with a square cross-section. The inner circle of the outer annular heating box (21) is fixedly connected to the outside of the reactor cylinder (17). A number of outer heating tubes (22) are provided in the outer annular heating box (21). The number of outer heating tubes (22) is evenly distributed in the outer annular heating box (21) in an annular array shape with the central axis of the outer annular heating box (21) as the axis. A pair of outer clamping frames (23) are symmetrically provided above and below the outer heating tubes (22). The outer heating tubes (22) are fixedly connected to the outer clamping frames (23). The inner ends of the outer clamping frames (23) are fixedly connected to the outer wall of the reactor cylinder (17).
2. The special filtering equipment for the oxidation system of a maleic anhydride device according to claim 1, characterized in that: At the upper end of the reactor end cover (18), there is a feed hopper (19) fixedly connected to the upper end of the reactor end cover (18). In the lower half of the feed hopper (19), there are a number of strip-shaped holes (20), and the strip-shaped holes (20) are evenly distributed in an array in the lower half of the feed hopper (19). The lower end of the feed hopper (19) is fixedly connected to the upper end of the internal heating box (8), and the feed hopper (19) and the internal heating box (8) are coaxially arranged.
3. The special filtering equipment for the oxidation system of a maleic anhydride device according to claim 1, characterized in that: In the reactor cylinder (17), there are a number of fixed rings (15), and the number of fixed rings (15) is evenly distributed from top to bottom in the reactor cylinder (17). The outer ends of the number of fixed rings (15) are all fixedly connected to the inner side wall of the reactor cylinder (17). In the number of fixed rings (15), there are a number of fixed bed layers (16), and the fixed bed layer (16) is clamped between two adjacent ones. The fixed bed layer (16) and the internal heating box (8) and the reactor cylinder (17) are coaxially arranged.
4. A special filtration device for the oxidation system of a maleic anhydride device according to claim 1, characterized in that: At the lower end of the reactor cylinder (17), there is a discharge pipe (14), and the discharge pipe (14) is fixedly connected and communicated with the lower end of the reactor cylinder (17). The discharge pipe (14) and the reactor cylinder (17) are coaxially arranged.
5. The special filtration equipment for the oxidation system of a maleic anhydride device according to claim 1, characterized in that: At the lower end of the reactor cylinder (17), there are a number of support legs (13), and the number of support legs (13) is evenly distributed in an annular array around the central axis of the reactor cylinder (17) at the lower end of the reactor cylinder (17). The upper ends of the number of support legs (13) are all fixedly connected to the lower end of the reactor cylinder (17).