Delayed coking heating furnace

Abstract

The utility model discloses a delayed coking heating furnace, which belongs to the technical field of delayed coking and comprises a furnace body, the furnace body is sequentially divided into a radiation cavity, a convection cavity and a chimney from bottom to top, a rotating ring is rotatably arranged at the bottom of the radiation cavity, one side of the rotating ring is fixedly connected with an arc-shaped toothed plate, and the other side of the rotating ring is fixedly connected with the chimney. A first driving assembly which is meshed with the toothed plate and drives the rotating ring to rotate is arranged on one side of the toothed plate, a plurality of outer combustion boxes are fixedly installed on the top face of the rotating ring in a circular array mode, and an inner combustion box is fixedly installed in the middle of the bottom face of the radiation cavity. According to the delayed coking heating furnace, the rotating ring is driven to rotate through the first driving assembly, so that rotation of the multiple outer combustion boxes is achieved, uniform heating of the outer side of the furnace tube is guaranteed, and uniform heating of the inner side and the outer side of the furnace tube is achieved in cooperation with the inner combustion box. Compared with an existing device, the problem of coking caused by non-uniform heating of the furnace tube is avoided, the problem of high maintenance cost of a sealing part caused by rotation of the furnace tube is also avoided, and the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of delayed coking technology, and in particular relates to a delayed coking heating furnace. Background Technology

[0002] Delayed coking is a thermal cracking process whose main purpose is to convert high-carbon residual oil into light oil. The equipment used can be circulated, that is, the heavier fractions in the coking distillate of heavy oil are used as circulating oil and have a long residence time in the equipment. The main equipment in the coking section are the heating furnace and the coke tower.

[0003] Existing delayed coking furnaces have high maintenance costs. For example, a novel delayed coking furnace, as disclosed in patent publication CN212864684U, includes a stepped furnace body with a radiant chamber inside. While this patent uses a motor to drive a turntable and furnace tubes to rotate, aiming for more uniform heating, the turntable's limitations prevent even heating between the sides of the furnace tubes facing the center, leading to coking and requiring ongoing maintenance. Furthermore, because the furnace tubes rotate with the turntable, ensuring a proper seal at the connecting pipes is difficult, further increasing maintenance costs.

[0004] Therefore, we propose a delayed coking heater to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to solve the problem of high subsequent maintenance costs in the existing technology by proposing a delayed coking heating furnace.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A delayed coking furnace includes a furnace body, which is divided into a radiant cavity, a convection cavity, and a chimney from bottom to top. A rotating ring is rotatably provided at the bottom of the radiant cavity. An arc-shaped toothed plate is fixedly connected to one side of the rotating ring. A first driving component is provided on one side of the toothed plate to engage the toothed plate and drive the rotating ring to rotate. Multiple external combustion boxes are fixedly installed in a circular array on the top surface of the rotating ring. An internal combustion box is fixedly installed in the middle of the bottom surface of the radiant cavity. A furnace tube is provided between the external combustion boxes and the internal combustion box, and the top end of the furnace tube extends into the convection cavity.

[0008] A filter plate is fixedly installed at the top of the chimney, and a baffle is movably installed below the filter plate. A second drive assembly is provided on one side of the chimney to drive the baffle to rotate.

[0009] Preferably, the first drive assembly includes a gear meshing with a toothed plate and a first motor that drives the gear to rotate.

[0010] Preferably, the number of external combustion chambers is not less than four.

[0011] Preferably, an inclined guide plate is provided between the radiation cavity and the convection cavity.

[0012] Preferably, the baffle is rotatably disposed inside the chimney, and the second drive assembly includes a second motor that drives the baffle to rotate.

[0013] Preferably, auxiliary blocks that cooperate with baffles are provided on both sides of the chimney.

[0014] Preferably, an upward-blowing exhaust fan is provided between the baffle and the filter plate.

[0015] In summary, the technical effects and advantages of this utility model are as follows: This delayed coking heater, through the first driving component driving the rotating ring to rotate, thereby realizing the rotation of multiple outer combustion chambers, ensures uniform heating on the outer side of the furnace tubes. Combined with the inner combustion chamber, it achieves uniform heating on both the inner and outer sides of the furnace tubes. Compared with existing devices, it avoids the problem of coking caused by uneven heating of the furnace tubes, and also avoids the problem of high maintenance costs at the sealing points due to the rotation of the furnace tubes, thus reducing maintenance costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the present invention.

[0018] Figure 3 This is a schematic diagram of the rotating ring structure in this utility model;

[0019] Figure 4 This is a cross-sectional front view of the present invention.

[0020] In the diagram: 1. Furnace body; 2. Radiant cavity; 3. Convection cavity; 4. Chimney; 5. Rotating ring; 6. Gear plate; 7. Outer combustion chamber; 8. Inner combustion chamber; 9. Furnace tube; 10. Filter plate; 11. Baffle; 12. Gear; 13. First motor; 14. Guide plate; 15. Second motor; 16. Auxiliary block; 17. Exhaust fan. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Reference Figure 1-3A delayed coking furnace includes a furnace body 1, which is divided into a radiant cavity 2, a convection cavity 3, and a chimney 4 from bottom to top. A rotating ring 5 is rotatably mounted at the bottom of the radiant cavity 2. An arc-shaped toothed plate 6 is fixedly connected to one side of the rotating ring 5. A first driving assembly is provided on one side of the toothed plate 6 to engage with the toothed plate 6 and drive the rotating ring 5 to rotate. Multiple outer combustion boxes 7 are fixedly mounted in a circular array on the top surface of the rotating ring 5. An inner combustion box 8 is fixedly mounted in the middle of the bottom surface of the radiant cavity 2. A furnace tube 9 is provided between the outer combustion boxes 7 and the inner combustion box 8, and the top end of the furnace tube 9 extends into the convection cavity 3. One end of the furnace tube 9 is located at the bottom of the radiant cavity and serves as the feed inlet; the other end is located at the top of the radiant cavity and serves as the discharge outlet.

[0023] The combustion chamber is existing technology, including the combustion chamber body and the gas pipeline. The gas pipeline of the inner combustion chamber 8 can be fixed, while the gas pipeline of the outer combustion chamber 7 needs to be movable because it needs to rotate.

[0024] A filter plate 10 is fixedly installed on the top of the chimney 4, and a baffle 11 is movably installed below the filter plate 10. A second drive assembly is provided on one side of the chimney 4 to drive the baffle 11 to open or close.

[0025] In operation, the delayed coking furnace is powered on by starting the first motor 13 and igniting the outer combustion chamber 7 and the inner combustion chamber 8. The outer and inner combustion chambers 7 and 8 heat the furnace tube 9. The first drive assembly drives the arc-shaped toothed plate 6 to rotate, which in turn drives the rotating ring 5 to rotate, causing the outer combustion chamber 7 to rotate accordingly. The feed oil in the furnace tube 9 is heated by the radiant chamber 2 and then enters the convection chamber 3. The flue gas in the radiant chamber 2 enters the convection chamber 3 and continues to heat the furnace tube 9. After heating is complete, the feed oil leaves the furnace and enters the subsequent coking tower. The second drive assembly drives the baffle 11 to rotate, and the flue gas in the furnace body 1 is filtered by the filter plate 10 and then discharged from the chimney 4.

[0026] The first drive assembly includes a gear 12 that meshes with the gear plate 6, and a first motor 13 that drives the gear 12 to rotate. The first motor 13 drives the gear 12 to rotate, thereby causing the gear plate 6 to rotate.

[0027] The number of external combustion chambers 7 shall not be less than four. Too few external combustion chambers 7 will result in low heating efficiency of furnace tube 9 and will affect the uniformity of heating of furnace tube 9; while too many external combustion chambers 7 will increase costs and have limited improvement effect. The following will explain the scheme with 5 external combustion chambers 7.

[0028] Since excessive rotation of the rotating ring 5 may cause wear to the gas pipeline, the rotating ring 5 only needs to rotate a maximum of 72° to achieve comprehensive and uniform heating of the furnace tube 9. After rotating 72°, it rotates in the opposite direction to achieve cyclical and uniform heating.

[0029] In order to improve the utilization rate of the furnace and the heat transfer efficiency of the furnace tube 9, and increase the volumetric thermal intensity of the furnace, an inclined guide plate 14 is provided between the radiation cavity 2 and the convection cavity 3.

[0030] Reference Figure 1 , Figure 2 , Figure 4 The baffle 11 is rotatably installed inside the chimney 4. The second drive assembly includes a second motor 15 that drives the baffle 11 to rotate. The second motor 15 drives the baffle 11 to rotate. When the baffle 11 is horizontal, it is in a closed state; when the baffle 11 is vertical, it is in an open state. The second motor 15 drives the baffle 11 to rotate, which can adjust the air volume of the chimney 4. During use, the air volume should be adjusted according to the temperature and pressure inside the furnace body 1.

[0031] In order to limit the position of the baffle 11 and improve the stability of the device, auxiliary blocks 16 are provided on both sides of the chimney 4 to cooperate with the baffle 11.

[0032] An upward-blowing exhaust fan 17 is provided between the baffle 11 and the filter plate 10, which assists airflow through the filter plate 10. A HEPA filter can be installed inside the filter plate 10 to capture fine particulate matter in the air and reduce environmental pollution.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A delayed coking heating furnace, comprising a furnace body (1), characterized in that, The furnace body (1) is divided into a radiation cavity (2), a convection cavity (3), and a chimney (4) from bottom to top. A rotating ring (5) is rotatably provided at the bottom of the radiation cavity (2). An arc-shaped toothed plate (6) is fixedly connected to one side of the rotating ring (5). A first driving component that meshes with the toothed plate (6) and drives the rotating ring (5) to rotate is provided on one side of the toothed plate (6). Multiple external combustion boxes (7) are fixedly installed in a circular array on the top surface of the rotating ring (5). An internal combustion box (8) is fixedly installed in the middle of the bottom surface of the radiation cavity (2). A furnace tube (9) is provided between the external combustion box (7) and the internal combustion box (8), and the top end of the furnace tube (9) extends into the convection cavity (3). A filter plate (10) is fixedly provided on the top of the chimney (4), and a baffle (11) is movably provided below the filter plate (10). A second drive assembly is provided on one side of the chimney (4) to drive the baffle (11) to rotate.

2. The delayed coking heating furnace according to claim 1, characterized in that, The first drive assembly includes a gear (12) that meshes with a toothed plate (6) and a first motor (13) that drives the gear (12) to rotate.

3. A delayed coking heating furnace according to claim 1, characterized in that, The number of external combustion chambers (7) shall not be less than four.

4. A delayed coking heating furnace according to claim 1, characterized in that, An inclined guide plate (14) is provided between the radiation cavity (2) and the convection cavity (3).

5. A delayed coking heating furnace according to claim 1, characterized in that, The baffle (11) is rotatably disposed inside the chimney (4), and the second drive assembly includes a second motor (15) that drives the baffle (11) to rotate.

6. A delayed coking heating furnace according to claim 5, characterized in that, The chimney (4) is provided with auxiliary blocks (16) on both sides to cooperate with the baffle (11).

7. A delayed coking heating furnace according to claim 5, characterized in that, An upward-blowing exhaust fan (17) is provided between the baffle (11) and the filter plate (10).

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