Carbon dioxide removal device for ammonia synthesis

Abstract

The utility model discloses a carbon dioxide removal device for ammonia synthesis, and belongs to the technical field of ammonia production from natural gas. Comprising an absorption tower body, a first liquid outlet pipe arranged at the bottom end of the absorption tower body and a filtering assembly arranged at the liquid outlet end of the first liquid outlet pipe, the filtering assembly comprises a filtering box, a filtering barrel arranged in the filtering box, a liquid distribution disc arranged on the filtering barrel, a plurality of liquid distribution holes formed in the bottom wall and the side wall of the liquid distribution disc, and a rotating pipe arranged on the top wall of the liquid distribution disc, wherein the top end of the rotating pipe sequentially and rotationally penetrates through the top wall of the filtering barrel and the top wall of the filtering box, and the rotating pipe is connected with a rotating assembly arranged outside the filtering box; the second liquid outlet pipe is arranged on the side wall of the filter box; and the liquid outlet end of the first liquid outlet pipe is arranged in the rotating pipe and is rotationally connected with the rotating pipe. According to the utility model, sulfur powder, rust and other solid impurities in the rich liquor can be removed before the rich liquor is regenerated, so that the purity of barren liquor or semi-barren liquor obtained after regeneration is effectively improved, and the decarburization efficiency of the barren liquor or semi-barren liquor is improved.

Description

Technical Field

[0001] This utility model relates to the field of natural gas ammonia production technology, and in particular to a carbon dioxide removal device for ammonia synthesis. Background Technology

[0002] The process of synthesizing ammonia from natural gas mainly includes steps such as desulfurization, secondary conversion, carbon monoxide shift reaction, carbon dioxide removal, and methanation. In existing technologies, benzil solution is primarily used for carbon dioxide removal. Benzil solution decarbonization is a method of purifying gas by adding diethanolamine as an activator to a hot potassium carbonate solution.

[0003] However, in the actual decarbonization process, as the benzyl solution continues to be decarbonized, the benzyl solution that has absorbed carbon dioxide (called rich solution) will have some solid impurities, such as sulfur powder (part of the hydrogen sulfide in natural gas reacts with the rust after equipment corrosion), rust, etc. These impurities will cause the rich solution to foam easily and produce liquid blockage, which will seriously affect the subsequent decarbonization effect. Utility Model Content

[0004] The purpose of this invention is to provide a carbon dioxide removal device for ammonia synthesis, so as to at least effectively remove solid impurities from rich liquid.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A carbon dioxide removal device for ammonia synthesis includes an absorption tower body, a first outlet pipe disposed at the bottom end of the absorption tower body, and a filter assembly disposed at the outlet end of the first outlet pipe. The filter assembly includes a filter box, a filter barrel disposed within the filter box, a distribution plate disposed within the filter barrel, multiple distribution holes disposed on the bottom and side walls of the distribution plate, a rotating pipe disposed on the top wall of the distribution plate with its top end rotatably penetrating through the top wall of the filter barrel and the top wall of the filter box and connected to a rotating assembly disposed outside the filter box, and a second outlet pipe disposed on the side wall of the filter box. The outlet end of the first outlet pipe is disposed within the rotating pipe and rotatably connected to the rotating pipe.

[0007] Preferably, the rotating assembly includes a first bevel gear sleeved on the rotating tube, a second bevel gear meshing with the first bevel gear, a rotating shaft connected to the center of the second bevel gear, and a motor disposed at the top of the filter box and fixedly connected to the end of the rotating shaft away from the second bevel gear.

[0008] Preferably, the rotating assembly further includes a retaining ring sleeved on the rotating tube via a bearing, and a retaining rod connecting the retaining ring and the top wall of the filter box.

[0009] Preferably, the filter box includes a box body and a box cover detachably disposed on the top of the box body; the filter bucket includes a bucket body and a bucket cover detachably disposed on the top of the bucket body, and the bucket cover and the box cover are detachably connected.

[0010] Preferably, the top of the bucket lid is provided with an L-shaped connecting plate, and the L-shaped connecting plate and the lid are connected by bolts.

[0011] Preferably, the barrel body and the barrel lid are threaded together.

[0012] Preferably, the liquid distribution plate and the rotating tube are threaded together.

[0013] Preferably, the inner wall of the filter box is provided with a plurality of support blocks that contact the bottom end of the filter barrel.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] By setting up a filter box, a filter barrel is installed inside the filter box, and a distribution plate connected to the first outlet pipe is installed inside the filter barrel; the decarbonized rich liquid can be introduced into the distribution plate along the first outlet pipe. After being separated by the distribution plate, the rich liquid can flow more evenly into the filter barrel, ensuring that the filtration is more balanced throughout the filter barrel. This avoids the technical problems of severe uneven filtration and low filtration efficiency that occur when the distribution plate is not used, where the rich liquid flows along the first outlet pipe to a certain point in the filter barrel.

[0016] By installing a rotating tube on the top wall of the separating plate, which rotates sequentially through the top wall of the filter bucket and the top wall of the filter box and is connected to a rotating assembly located outside the filter box, and by rotating the first outlet pipe to the rotating tube, the rotating assembly can drive the rotating tube to rotate in the first outlet pipe during the separating process, thereby causing the separating plate connected to the rotating tube to rotate accordingly. Through the action of centrifugal force, the discharge efficiency of the rich liquid in the separating plate can be significantly improved, further improving the filtration efficiency.

[0017] Through the synergistic effect of the above devices, solid impurities such as sulfur powder and rust in the rich solution can be removed before regeneration, thereby effectively improving the purity of the lean or semi-lean solution obtained after regeneration, improving its decarbonization efficiency, reducing the foaming degree of the rich solution formed after the lean or semi-lean solution is decarbonized again, and effectively alleviating the problem of liquid blockage. Attached Figure Description

[0018] Figure 1 This is a schematic cross-sectional view of Example 1 from the front view.

[0019] Figure 2 for Figure 1A cross-sectional view of the middle filter box after the L-shaped plate is installed, viewed from the front.

[0020] Figure 3 for Figure 2 A top-view cross-sectional view of the middle filter barrel;

[0021] In the diagram: 1-Absorption tower body, 2-First outlet pipe, 3-Filter box, 4-Filter barrel, 5-Distribution plate, 6-Rotating pipe, 7-Second outlet pipe, 8-First bevel gear, 9-Second bevel gear, 10-Rotating shaft, 11-Motor, 12-Fixing ring, 13-Fixing rod, 301-Box body, 302-Box cover, 401-Barrel body, 402-Barrel cover, 14-Connecting plate, 16-Bolt, 15-Support block. Detailed Implementation

[0022] Example 1

[0023] A carbon dioxide removal device for ammonia synthesis includes an absorption tower body 1, a first outlet pipe 2 disposed at the bottom of the absorption tower body 1, and a filter assembly disposed at the outlet end of the first outlet pipe 2. The filter assembly includes a filter box 3, a filter barrel 4 disposed within the filter box 3 (the side walls and bottom walls of the filter barrel 4 are provided with multiple filter holes), a distribution plate 5 disposed within the filter barrel 4, multiple distribution holes disposed on the bottom wall and side walls of the distribution plate 5, a rotating pipe 6 disposed on the top wall of the distribution plate 5 and whose top end rotatably penetrates the top wall of the filter barrel 4 and the top wall of the filter box 3 and is connected to a rotating assembly disposed outside the filter box 3, and a second outlet pipe 7 disposed on the side wall of the filter box 3. The outlet end of the first outlet pipe 2 is disposed within the rotating pipe 6 and is rotatably connected to the rotating pipe 6.

[0024] The absorption tower body 1 adopts existing technology, that is, it includes the absorption tower and the components installed therein, such as a lean liquid spray section at the top of the absorption tower, a semi-lean liquid spray assembly in the middle of the absorption tower, and a defoamer, an anti-vortex baffle, and a gas distributor at the bottom of the absorption tower. That is, all the components inside the absorption tower adopt existing technology, and this utility model does not make any improvements to them.

[0025] Furthermore, such as Figure 1 As shown, the rotating assembly includes a first bevel gear 8 sleeved on the rotating tube 6, a second bevel gear 9 meshing with the first bevel gear 8, a rotating shaft 10 connected to the center of the second bevel gear 9, and a motor 11 disposed at the top of the filter box 3 and fixedly connected to the end of the rotating shaft 10 away from the second bevel gear 9. Further, as... Figure 1 As shown, the rotating assembly also includes a fixing ring 12 sleeved on the rotating tube 6 via a bearing, and a fixing rod 13 connecting the fixing ring 12 and the top wall of the filter box 3.

[0026] Working principle: Natural gas is introduced through the inlet pipe at the bottom of the absorption tower body 1. After being distributed by the gas distributor at the bottom of the absorption tower, it comes into countercurrent contact with the lean liquid from the top of the tower and the semi-lean liquid from the middle of the tower, completing the decarbonization reaction in the absorption tower. The resulting rich liquid is discharged from the first outlet pipe 2 of the absorption tower to the filter box 3. Specifically, a water pump can be installed on the first outlet pipe 2. The rich liquid flows into the separating plate 5 along the first outlet pipe 2, and then is sprayed onto the side wall and bottom wall of the filter box 4 through multiple separating holes in the separating plate 5. It is then filtered by the side wall and bottom wall of the filter box 4, retaining solid impurities such as sulfur and rust inside the filter box 4, thus achieving solid-liquid separation.

[0027] During the filtration process, to improve filtration efficiency, motor 11 needs to be turned on. Under the action of motor 11, the rotating shaft 10 drives the second bevel gear 9 to rotate. The second bevel gear 9 drives the first bevel gear 8, which meshes with it, to rotate. This, in turn, drives the rotating tube 6 and the separating plate 5 connected to the rotating tube 6 to rotate. During the rotation, the rich liquid in the separating plate 5 can quickly pass through the separating holes of the separating plate 5 under the action of centrifugal force, and the rich liquid discharged through the separating holes is quickly thrown towards the side wall and bottom wall of the filter barrel 4, improving filtration efficiency. The filtered rich liquid is discharged through the second outlet pipe 7 and enters the regeneration process.

[0028] Through the synergistic effect of the above devices, solid impurities such as sulfur powder and rust in the rich solution can be removed before regeneration, thereby effectively improving the purity of the lean or semi-lean solution obtained after regeneration, improving its decarbonization efficiency, reducing the foaming degree of the rich solution formed after the lean or semi-lean solution is decarbonized again, and effectively alleviating the problem of liquid blockage.

[0029] Example 2

[0030] Based on Example 1, such as Figure 2 and Figure 3 As shown, the filter box 3 includes a box body 301 and a detachable cover 302 detachably mounted on the top of the box body 301 (the box body 301 and the cover 302 can be connected by bolts 16), so that the components inside the box body 301 or the components on the cover 302 can be repaired or cleaned after the cover 302 is opened. The filter bucket 4 includes a bucket body 401 and a detachable cover 402 detachably mounted on the top of the bucket body 401, and the cover 402 and the box cover 302 are detachably connected. Further, the bucket body 401 and the cover 402 are threaded together. When it is necessary to clean solid impurities inside the bucket body 401, the cover 302 is opened, and then the bucket body 401 is rotated to disassemble the bucket body 401 and the cover 402, thus completing the cleaning, repair or replacement of the bucket body 401. Further, as Figure 2As shown, an L-shaped connecting plate 14 is provided at the top of the barrel cover 402. The L-shaped connecting plate 14 and the box cover 302 are connected by bolts 16. This arrangement allows the filter barrel 4 to be installed inside the filter box 3, improving the convenience of disassembly and installation. Furthermore, the distributing plate 5 and the rotating tube 6 are threadedly connected. After the barrel body 401 is removed from the barrel cover 402, the distributing plate 5 can be directly rotated to separate it from the rotating tube 6, facilitating maintenance and replacement of the distributing plate 5. Further, as... Figure 2 and Figure 3 As shown, the inner wall of the filter box 3 is provided with a plurality of support blocks 15 that contact the bottom end of the filter barrel 4 to support the filter barrel 4 and share the load of the L-shaped connecting block.

Claims

1. A carbon dioxide removal device for synthetic ammonia, comprising an absorption tower body (1), a first liquid outlet pipe (2) arranged at the bottom end of the absorption tower body (1), and a filter assembly arranged at the liquid outlet end of the first liquid outlet pipe (2); characterized in that, The filter assembly comprises a filter box (3), a filter barrel (4) arranged in the filter box (3), a distribution disc (5) arranged in the filter barrel (4), a plurality of distribution holes arranged in the bottom wall and the side wall of the distribution disc (5), a rotating tube (6) arranged in the top wall of the distribution disc (5) and rotatingly penetrating the top wall of the filter barrel (4) and the top wall of the filter box (3) in sequence and being connected with a rotating assembly arranged outside the filter box (3), and a second liquid outlet pipe (7) arranged in the side wall of the filter box (3); the liquid outlet end of the first liquid outlet pipe (2) is arranged in the rotating tube (6) and is rotatably connected with the rotating tube (6).

2. The carbon dioxide removal device for synthetic ammonia according to claim 1, characterized by The rotating assembly comprises a first bevel gear (8) sleeved on the rotating tube (6), a second bevel gear (9) engaged with the first bevel gear (8), a rotating shaft (10) connected with the center of the second bevel gear (9), and a motor (11) arranged at the top end of the filter box (3) and fixedly connected with the end of the rotating shaft (10) away from the second bevel gear (9).

3. The carbon dioxide removal device for synthetic ammonia according to claim 2, characterized by The rotating assembly further comprises a fixing ring (12) sleeved on the rotating tube (6) through a bearing, and a fixing rod (13) connecting the fixing ring (12) and the top wall of the filter box (3).

4. The carbon dioxide removal device for synthetic ammonia according to claim 1, characterized by The filter box (3) comprises a box body (301) and a box cover (302) detachably arranged at the top end of the box body (301); the filter barrel (4) comprises a barrel body (401) and a barrel cover (402) detachably arranged at the top end of the barrel body (401), and the barrel cover (402) and the box cover (302) are detachably connected.

5. The carbon dioxide removal device for synthetic ammonia according to claim 4, wherein An L-shaped connecting plate (14) is arranged at the top end of the barrel cover (402), and the L-shaped connecting plate (14) and the box cover (302) are connected through a bolt (16).

6. The carbon dioxide removal device for synthetic ammonia according to claim 4, wherein The barrel body (401) and the barrel cover (402) are threadedly connected.

7. The carbon dioxide removal device for synthetic ammonia according to claim 4, wherein The distribution disc (5) and the rotating tube (6) are threadedly connected.

8. The carbon dioxide removal device for synthetic ammonia according to claim 5, wherein A plurality of support blocks (15) are arranged on the inner wall of the filter box (3) and in contact with the bottom end of the filter barrel (4).

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