Decarburization device for synthetic ammonia

Abstract

The utility model discloses a decarburization device for synthesis ammonia, and belongs to the technical field of ammonia production from natural gas. Comprising an absorption tower body, an absorption cover and a spraying assembly which are sequentially arranged in the absorption tower body from bottom to top, a return pipe arranged on the side wall of the absorption tower body, and a storage box arranged outside the absorption tower body and communicated with the absorption cover, the storage box is communicated with a connecting pipe, a filter box is arranged at the liquid outlet end of the connecting pipe, a filter screen is horizontally arranged in the filter box, and the liquid inlet end of the return pipe is connected with the side wall of the filter box; a water pump is arranged on the connecting pipe; a gas inlet pipe is arranged on the side wall of the absorption tower body, and the gas inlet end of the gas inlet pipe is connected with a gas distribution assembly arranged in the absorption tower body. According to the utility model, solid impurities such as sulfur powder and rust generated in the carbon absorption liquid can be filtered, and the technical problem that the solid impurities enter the spraying assembly to cause the blockage of the spraying assembly is avoided.

Description

Technical Field

[0001] This utility model relates to the field of natural gas ammonia production technology, and in particular to a decarbonization 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] For example, patent application number CN202220298955.X discloses a decarbonization device for natural gas pretreatment in natural gas power generation. This device uses a liquid circulation mechanism formed by components such as a collection hood, storage tank, return pipe, first structured packing, bulk packing, and a first spraying mechanism to allow for the reuse of the absorbent liquid. However, in actual implementation, during the continuous decarbonization process of the absorbent liquid, some solid impurities, such as sulfur powder (a reaction between some hydrogen sulfide in natural gas and rust from equipment corrosion) and rust, will accumulate in the absorbent liquid. These solid impurities entering the liquid circulation mechanism are highly likely to cause blockage of the first spraying mechanism, and will also cause blockage of the pores of the first structured packing and bulk packing, thus hindering the smooth circulation of the absorbent liquid and adversely affecting the carbon absorption operation. Utility Model Content

[0004] The purpose of this invention is to provide a decarbonization device for ammonia synthesis, so as to at least remove solid impurities and improve the smooth circulation of carbon adsorption liquid.

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

[0006] A decarbonization device for ammonia synthesis includes an absorption tower body, an absorption hood and a spray assembly arranged sequentially from bottom to top within the absorption tower body, a reflux pipe disposed on the side wall of the absorption tower body, and a storage tank disposed outside the absorption tower body and communicating with the absorption hood; a connecting pipe is connected to the storage tank, a filter box is disposed at the liquid outlet end of the connecting pipe, a filter screen is horizontally disposed inside the filter box, and the liquid inlet end of the reflux pipe is connected to the side wall of the filter box; a water pump is disposed on the connecting pipe;

[0007] An air inlet pipe is provided on the side wall of the absorption tower body, and the air inlet end of the air inlet pipe is connected to the gas distribution component provided inside the absorption tower body.

[0008] Preferably, the gas distribution assembly includes an S-shaped tube disposed inside the absorption hood, and a plurality of gas outlet holes disposed at the lower part of the S-shaped tube.

[0009] Preferably, the top of the filter box is provided with a box cover, and the filter screen and the inner wall of the filter box are slidably connected; the liquid outlet end of the connecting pipe is provided on the box cover.

[0010] Preferably, the liquid outlet end of the connecting pipe is provided with a liquid distribution tank, and the bottom end of the liquid distribution tank is provided with multiple liquid outlet holes.

[0011] Preferably, the outer wall of the filter screen is provided with a slider, and the inner wall of the filter box is provided with a vertical groove that slides with the slider, the top of the vertical groove being in communication with the outside.

[0012] Preferably, a limiting rod is provided at the top of the filter screen, and the top of the limiting rod can contact the dispensing tank.

[0013] Preferably, the absorption tower body is further provided with an orifice plate, and the orifice plate is provided with a packing layer, the packing layer being a porous and loosely structured packing.

[0014] Preferably, the spray assembly includes multiple coaxial rings disposed within the absorption tower body, a fixing pipe connecting the multiple rings, and multiple spray holes disposed at the bottom end of each ring.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] By installing a connecting pipe on the storage tank, a filter box at the outlet of the connecting pipe, a horizontal filter screen inside the filter box, and connecting the inlet of the return pipe to the side wall of the filter box, the carbon absorbent liquid can absorb carbon dioxide, flow into the storage tank through the absorption hood, and then be filtered by the filter screen. This filters out solid impurities such as sulfur powder and rust generated in the carbon absorbent liquid, preventing these solid impurities from entering the spray assembly and causing clogging of the spray assembly.

[0017] By installing a gas distribution component at the outlet end of the inlet pipe, the natural gas entering the absorber body can be divided, increasing its contact area with the carbon adsorbent liquid and thus improving the carbon removal efficiency. Attached Figure Description

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

[0019] Figure 2 for Figure 1 A schematic diagram of the structure of the middle ring from a top view.

[0020] Figure 3 A schematic diagram of the S-shaped tube from a top view.

[0021] In the diagram: 1-Absorption tower body, 2-Absorption hood, 5-Return pipe, 6-Storage tank, 7-Connecting pipe, 8-Filter box, 9-Filter screen, 10-Water pump, 11-Air inlet pipe, 12-S-shaped pipe, 13-Box cover, 14-Divider, 15-Slider, 16-Vertical chute, 17-Limiting rod, 18-Orifice plate, 19-Packing layer, 20-Circular ring, 21-Fixing pipe. Detailed Implementation

[0022] Example 1

[0023] A decarbonization device for ammonia synthesis, such as Figure 1 As shown, the absorption tower includes an absorption tower body 1, an absorption hood 2 and a spray assembly arranged sequentially from bottom to top inside the absorption tower body 1, a reflux pipe 5 disposed on the side wall of the absorption tower body 1, and a storage tank 6 disposed outside the absorption tower body 1 and communicating with the absorption hood 2. The storage tank 6 contains carbon adsorption liquid (benzyl sulfate solution); Figure 1 As shown, a connecting pipe 7 is connected to the storage tank 6, and a filter box 8 is installed at the outlet end of the connecting pipe 7. A filter screen 9 is horizontally installed inside the filter box 8, and the inlet end of the return pipe 5 is connected to the side wall of the filter box 8; a water pump 10 is installed on the connecting pipe 7; as shown Figure 1 As shown, an air inlet pipe 11 is provided on the side wall of the absorption tower body 1, and the air inlet end of the air inlet pipe 11 is connected to a gas distribution assembly provided inside the absorption tower body 1. An air outlet pipe is provided on the side wall of the absorption tower body 1.

[0024] Furthermore, such as Figure 1-2 As shown, the spray assembly includes multiple coaxial rings 20 disposed within the absorption tower body 1, a fixed pipe 21 connecting the multiple rings 20, and multiple spray holes (existing technology, not shown in the figure) disposed at the bottom end of each ring 20; the multiple fixed pipes 21 and the multiple rings 20 are interconnected internally.

[0025] Furthermore, such as Figure 3 As shown, the gas distribution assembly includes an S-shaped tube 12 disposed within the absorption shroud 2, and a plurality of gas outlets (existing technology, not shown in the figure) disposed at the lower part of the S-shaped tube 12. It should be noted that... Figure 1 The S-shaped tube 12 is not drawn in the diagram.

[0026] Working principle: When the water pump 10 is turned on, the carbon-absorbing liquid in the storage tank 6 enters the filter tank 8 along the connecting pipe 7. After being filtered by the filter screen 9, it enters the ring 20 along the return pipe 5, and is then transported to other rings 20 via the fixed pipe 21, finally being sprayed through the nozzles at the bottom of multiple rings 20. Subsequently, the gas to be decarbonized is introduced into the absorption tower body 1 along the inlet pipe 11, and then discharged through multiple outlets at the bottom of the S-shaped pipe 12 (setting the outlets at the bottom of the S-shaped pipe 12 prevents the carbon-absorbing liquid from entering the S-shaped pipe 12 along the outlets). The gas, upon contact with the carbon-absorbing liquid spray, achieves the purpose of removing carbon dioxide. After carbon absorption, the carbon-absorbing liquid is discharged back into the storage tank 6 along the absorption hood 2, and the process of circulating the carbon-absorbing liquid is repeated.

[0027] Through the synergistic effect of the above-mentioned devices, solid impurities generated in the carbon adsorption liquid, such as sulfur powder and rust, can be filtered out, thus preventing these solid impurities from entering the spray assembly and causing clogging of the spray assembly.

[0028] Example 2

[0029] In Example 1, when a large amount of solid impurities adhere to the filter screen 9, it needs to be removed and cleaned promptly. Based on this, and building upon Example 1, as follows... Figure 1 As shown, the top of the filter box 8 is provided with a box cover 13, and the filter screen 9 is slidably connected to the inner wall of the filter box 8; the liquid outlet end of the connecting pipe 7 (selected as a flexible hose) is located on the box cover 13. The box cover 13 and the box body can be connected by existing connection methods such as threaded connection. Furthermore, as... Figure 1 As shown, the outer wall of the filter screen 9 is provided with a slider 15, and the inner wall of the filter box 8 is provided with a vertical sliding groove 16 that slides with the slider 15. The top of the vertical sliding groove 16 communicates with the outside. When the filter screen 9 needs to be removed, the box cover 13 is opened, and the filter screen 9 is taken out upwards. During this process, the slider 15 on the outer wall of the filter screen 9 slides upwards in the vertical sliding groove 16, improving the smoothness of removal.

[0030] Furthermore, such as Figure 1 As shown, a liquid distribution tank 14 is provided at the outlet end of the connecting pipe 7, and multiple liquid outlet holes are provided at the bottom end of the liquid distribution tank 14. In this scheme, by setting up the liquid distribution tank 14, the carbon adsorbent entering through the connecting pipe 7 can be divided through multiple liquid outlet holes, so that it flows to the entire filter screen 9 to the maximum extent, thereby improving the utilization rate and filtration efficiency of the filter screen 9.

[0031] Furthermore, such as Figure 1As shown, the top of the filter screen 9 is provided with a limiting rod 17 (the number is not limited), and the top of the limiting rod 17 can contact the dispensing tank 14. In this solution, by setting the limiting rod 17 and limiting the contact between the top of the limiting rod 17 and the dispensing tank 14, the filter screen 9 can be limited, so that it is always located at the bottom of the vertical slide 16 during filtration. At the same time, when removing the filter screen 9, it is also convenient for the staff to hold the limiting rod 17 and pull the filter screen 9 upward, improving the ease of removal of the filter screen 9.

[0032] Furthermore, such as Figure 1 As shown, the absorption tower body 1 is also provided with an orifice plate 18, and a packing layer 19 is provided on the orifice plate 18. The packing layer 19 is a porous and loosely structured packing material in the prior art. By providing the packing layer 19, the absorption of carbon dioxide can be further improved, thereby increasing the carbon removal efficiency.

Claims

1. A decarburization device for ammonia synthesis, comprising an absorption tower body (1), an absorption cover (2) and a spray assembly arranged in the absorption tower body (1) in sequence from bottom to top, a reflux pipe (5) arranged on the side wall of the absorption tower body (1), and a storage tank (6) arranged outside the absorption tower body (1) and communicating with the absorption cover (2); characterized in that A connecting pipe (7) is communicated on the storage tank (6), a filter tank (8) is arranged at the liquid outlet end of the connecting pipe (7), a filter screen (9) is horizontally arranged in the filter tank (8), and the liquid inlet end of the reflux pipe (5) is connected with the side wall of the filter tank (8); A water pump (10) is arranged on the connecting pipe (7); An air inlet pipe (11) is arranged on the side wall of the absorption tower body (1), and the air inlet end of the air inlet pipe (11) is connected with a gas distribution assembly arranged in the absorption tower body (1).

2. The decarburization device for synthetic ammonia according to claim 1, characterized by The gas distribution assembly comprises an S-shaped pipe (12) arranged in the absorption cover (2), and a plurality of gas outlet holes arranged at the lower part of the S-shaped pipe (12).

3. The decarburization device for synthetic ammonia according to claim 1, characterized by A tank cover (13) is arranged at the top end of the filter tank (8), the filter screen (9) and the inner wall of the filter tank (8) are slidably connected; The liquid outlet end of the connecting pipe (7) is arranged on the tank cover (13).

4. The decarbonizer for synthetic ammonia production according to claim 3, characterized by A distribution tank (14) is arranged at the liquid outlet end of the connecting pipe (7), and a plurality of liquid outlet holes are arranged at the bottom end of the distribution tank (14).

5. The decarbonizer for synthetic ammonia production according to claim 4, characterized by A sliding block (15) is arranged on the outer wall of the filter screen (9), and a vertical sliding groove (16) slidably matched with the sliding block (15) is arranged on the inner wall of the filter tank (8), and the top end of the vertical sliding groove (16) is communicated with the outside.

6. The decarbonizer for synthetic ammonia production according to claim 5, wherein A limiting rod (17) is arranged at the top end of the filter screen (9), and the top end of the limiting rod (17) can contact the distribution tank (14).

7. The decarbonizer for synthetic ammonia production according to claim 1, characterized by A perforated plate (18) is further arranged in the absorption tower body (1), a filler layer (19) is arranged on the perforated plate (18), and the filler layer (19) is a porous and loose filler.

8. The decarbonizer for synthetic ammonia production according to claim 1, characterized by The spray assembly comprises a plurality of coaxial annular rings (20) arranged in the absorption tower body (1), a fixing pipe (21) connecting the plurality of annular rings (20), and a plurality of spray holes arranged at the bottom end of each annular ring (20).

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