Device for generating sodium hypochlorite by absorbing carbon dioxide in chlorine-containing tail gas

Abstract

The utility model discloses a device for generating sodium hypochlorite by absorbing carbon dioxide in chlorine-containing tail gas. The device comprises a tail gas pipeline, an adsorption mechanism and a spraying mechanism, the front side and the rear side of the tail gas pipeline are connected with first valves symmetrically distributed left and right through bolts. The adsorption mechanism comprises adsorption tanks and tail gas auxiliary pipelines, valves I are connected with the lower ends of the adsorption tanks through bolts, the tail gas auxiliary pipelines are arranged at the upper ends and the lower ends of the opposite inner side ends of every two adsorption tanks adjacent left and right, and gas supply pipelines are connected between the tail gas auxiliary pipelines at the upper ends through valves III through bolts; according to the device for generating sodium hypochlorite by absorbing carbon dioxide in chlorine-containing tail gas, the concentration of sodium hypochlorite obtained by treating the tail gas is increased by absorbing carbon dioxide, the income of a company is increased, the unnecessary cost is reduced, and meanwhile, the later investment is reduced by means of the adsorption tank and the adsorbent; and the adsorbent is recycled in an adsorption regeneration manner.

Description

Technical Field

[0001] The utility model relates to the technical field of chlorine tail gas treatment, in particular to a device for generating sodium hypochlorite by absorbing carbon dioxide in the chlorine-containing tail gas. Background Technique

[0002] With the continuous improvement of living standards, people's demand for nano-new materials is getting higher and higher, especially fumed silica, which is an important raw material for organosilicon. In the process of producing fumed silica, a small amount of chlorine gas is generated. We usually adopt the method of liquid caustic soda washing to absorb chlorine gas to obtain a sodium hypochlorite solution with a certain concentration. The sodium hypochlorite solution with higher purity can be sold as a by-product. When using methyltrichlorosilane as the raw material to produce fumed silica, due to the presence of carbon dioxide in the tail gas, the concentration of sodium hypochlorite is relatively low and cannot be sold externally, so it can only be treated, which causes waste of resources and increase of costs.

[0003] Usually, hydrogen is added to the tail gas to react hydrogen with chlorine gas to obtain hydrogen chloride. This method consumes chlorine gas to avoid the generation of sodium hypochlorite. This method requires relatively high operating requirements, and the hydrogen reaction is not complete, posing a greater safety hazard. Therefore, we propose a device for generating sodium hypochlorite by absorbing carbon dioxide in the chlorine-containing tail gas. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the existing defects, and provide a device for generating sodium hypochlorite by absorbing carbon dioxide in the chlorine-containing tail gas. By absorbing carbon dioxide, the concentration of sodium hypochlorite obtained by treating the tail gas is increased, the company's income is increased, unnecessary costs are reduced. At the same time, the later investment is reduced in the form of an adsorption tank and an adsorbent, and the adsorbent is recycled by the adsorption regeneration method, which can effectively solve the problems in the background technique.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: A device for generating sodium hypochlorite by absorbing carbon dioxide in the chlorine-containing tail gas, including a tail gas pipeline, an adsorption mechanism and a spraying mechanism;

[0006] Tail gas pipeline: Valves I which are symmetrically distributed left and right are connected to both the front and rear sides thereof by bolts;

[0007] Adsorption mechanism: It includes an adsorption tank and a tail gas auxiliary pipeline. The valves I are respectively connected to the lower end of the adsorption tank by bolts. Tail gas auxiliary pipelines are provided at both the upper and lower ends of the relatively inner sides of two adjacent adsorption tanks on the left and right. A gas supply pipeline is connected to the upper tail gas auxiliary pipelines by bolts through valves III;

[0008] Spraying mechanism: It is placed at the rear side of the tail gas pipeline. The middle part of the spraying mechanism is connected to the rear end of the air supply pipeline. By absorbing carbon dioxide, the concentration of sodium hypochlorite obtained from treating the tail gas is increased, which increases the company's revenue, reduces unnecessary costs. At the same time, through the form of an adsorption tank and adsorbent, the later investment is reduced, and the adsorbent can be recycled through adsorption regeneration.

[0009] Furthermore, the adsorption mechanism further includes a grid fixing plate and an adsorbent. Grid fixing plates are provided at both the upper and lower ends inside the adsorption tank. An adsorbent is filled between the two grid fixing plates in the same adsorption tank to achieve the removal of carbon dioxide.

[0010] Furthermore, the adsorbent is a renewable amine-based solid adsorbent, and the adsorbent can be recycled.

[0011] Furthermore, the adsorption mechanism further includes a regeneration gas sub-pipeline. Regeneration gas sub-pipelines are provided at both the upper and lower ends of the outer sides facing away from each other of two adjacent adsorption tanks on the left and right. A regeneration gas pipeline is bolted between two regeneration gas sub-pipelines adjacent to each other front and back at the lower end through a valve two. The regeneration gas sub-pipeline at the upper end is bolted to a valve four to achieve the regeneration of the adsorbent.

[0012] Furthermore, the spraying mechanism includes a sodium hypochlorite storage chamber, a spraying pipeline, and an exhaust port. The sodium hypochlorite storage chamber is placed at the rear side of the tail gas pipeline. The upper end of the sodium hypochlorite storage chamber is connected to the rear end of the air supply pipeline. Uniformly distributed spraying pipelines are provided at the upper part inside the sodium hypochlorite storage chamber. An exhaust port is fixedly connected to the upper end of the sodium hypochlorite storage chamber to achieve the reaction of chlorine gas and alkali solution to obtain a sodium hypochlorite solution.

[0013] Furthermore, the spraying mechanism further includes a bolted plate packing and a support plate. A support plate is provided inside the sodium hypochlorite storage chamber. The bolted plate packing is placed on the upper end of the support plate. The bolted plate packing is located at the lower end of the connection port between the sodium hypochlorite storage chamber and the air supply pipeline to improve the treatment efficiency of chlorine gas.

[0014] Furthermore, the spraying mechanism further includes a sodium hypochlorite pipeline. The sodium hypochlorite pipeline is provided at the lower end of the sodium hypochlorite storage chamber to facilitate the recovery of the sodium hypochlorite solution.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: The device for generating sodium hypochlorite by absorbing carbon dioxide in the chlorine-containing tail gas has the following advantages:

[0016] 1. Divide the two adsorption tanks at the front side into Group A and the two adsorption tanks at the rear side into Group B. When the device for generating sodium hypochlorite by absorbing carbon dioxide in the chlorine-containing tail gas operates, Group A adsorbs carbon dioxide and Group B regenerates the adsorbent. For the adsorption tanks in Group A, close Valve 2 and Valve 4 and open Valve 1 and Valve 3. For the adsorption tanks in Group B, open Valve 2 and Valve 4 and close Valve 1 and Valve 3. When it is necessary to exchange the functions of the adsorption tanks in Groups A and B, just interchange the switch states of each valve. After the tail gas enters the interior of the adsorption tank through the tail gas pipeline, the carbon dioxide is absorbed after the tail gas passes through the adsorbent between the two grid fixing plates. Online analyzers are provided on the tail gas auxiliary pipelines at the upper ends of the adsorption tanks to detect the carbon dioxide concentration passing through the upper tail gas auxiliary pipelines, and judge whether it is necessary to exchange the functions of the adsorption tanks in Groups A and B. By absorbing carbon dioxide, the concentration of sodium hypochlorite obtained from the treated tail gas is increased, the company's revenue is increased, and unnecessary costs are reduced.

[0017] 2. In the adsorption tank for adsorbent regeneration, after the regeneration gas enters the interior of the adsorption tank, the adsorbent between the two grid fixing plates combines with the regeneration gas to realize the regeneration of the adsorbent. The excess regeneration gas is discharged through the regeneration gas auxiliary pipeline at the upper end. The later investment is reduced through the form of the adsorption tank and the adsorbent, and the adsorbent is recycled through the adsorption regeneration method. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the present utility model;

[0019] Figure 2 It is a schematic plan sectional view structural diagram of the adsorption mechanism of the present utility model;

[0020] Figure 3 It is a schematic plan sectional view structural diagram of the spraying mechanism of the present utility model.

[0021] In the figure: 1 tail gas pipeline, 2 adsorption mechanism, 21 adsorption tank, 22 grid fixing plate, 23 adsorbent, 24 regeneration gas auxiliary pipeline, 25 tail gas auxiliary pipeline, 3 spraying mechanism, 31 sodium hypochlorite pipeline, 32 sodium hypochlorite storage chamber, 33 bolted plate packing, 34 spraying pipeline, 35 exhaust port, 36 support plate, 4 Valve 1, 5 Valve 2, 6 regeneration gas pipeline, 7 air supply pipeline, 8 Valve 3, 9 Valve 4. Detailed Embodiment

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] Please refer to Figures 1-3 , this embodiment provides a technical solution: a device for generating sodium hypochlorite by absorbing carbon dioxide in chlorine-containing tail gas, which includes a tail gas pipeline 1, an adsorption mechanism 2 and a spraying mechanism 3;

[0024] Tail gas pipeline 1: Valves 4 symmetrically distributed left and right are connected to both the front and rear sides thereof by bolts;

[0025] Adsorption mechanism 2: It includes an adsorption tank 21 and a tail gas sub-pipeline 25. Valve 1 4 is respectively bolted to the lower end of the adsorption tank 21. Tail gas sub-pipelines 25 are provided at both the upper and lower ends of the relatively inner sides of two adjacent adsorption tanks 21. A gas supply pipeline 7 is bolted between the upper tail gas sub-pipelines 25 through Valve 3 8. The adsorption mechanism 2 further includes a grid fixing plate 22 and an adsorbent 23. Grid fixing plates 22 are provided at both the upper and lower ends inside the adsorption tank 21. An adsorbent 23 is filled between the two grid fixing plates 22 in the same adsorption tank 21. The adsorbent 23 is a renewable amine-based solid adsorbent. The adsorption mechanism 2 further includes a regeneration gas sub-pipeline 24. Regeneration gas sub-pipelines 24 are provided at both the upper and lower ends of the outer sides of two adjacent adsorption tanks 21 that face away from each other. A regeneration gas pipeline 6 is bolted between the two adjacent regeneration gas sub-pipelines 24 at the lower end in the front-back direction. The upper regeneration gas sub-pipeline 24 is bolted with Valve 4 9. The two adsorption tanks 21 on the front side are divided into Group A, and the two adsorption tanks 21 on the back side are divided into Group B. When the device for generating sodium hypochlorite by absorbing carbon dioxide in the chlorine-containing tail gas operates, Group A adsorbs carbon dioxide, and Group B regenerates the adsorbent. The adsorption tanks 21 in Group A close Valve 2 5 and Valve 4 9, and open Valve 1 4 and Valve 3 8. The adsorption tanks 21 in Group B open Valve 2 5 and Valve 4 9, and close Valve 1 4 and Valve 3 8. When it is necessary to exchange the functions of the adsorption tanks 21 in Groups A and B, the switch states of each valve are interchanged. After the tail gas enters the inside of the adsorption tank 21 through the tail gas pipeline 1 in the adsorption tank 21 for adsorbing carbon dioxide, after the tail gas passes through the adsorbent 23 between the two grid fixing plates 22, carbon dioxide is absorbed. Online analyzers are provided on the upper tail gas sub-pipelines 25 of the adsorption tank 21 to detect the carbon dioxide concentration passing through the upper tail gas sub-pipeline 25, and judge whether it is necessary to exchange the functions of the adsorption tanks 21 in Groups A and B. After the regeneration gas enters the inside of the adsorption tank 21 in the adsorption tank 21 for regenerating the adsorbent, the adsorbent 23 between the two grid fixing plates 22 combines with the regeneration gas to realize the regeneration of the adsorbent 23, and the excess regeneration gas is discharged through the upper regeneration gas sub-pipeline 24;

[0026] Spraying mechanism 3: It is placed at the rear side of the tail gas pipeline 1. The middle part of the spraying mechanism 3 is connected to the rear end of the air supply pipeline 7. The spraying mechanism 3 includes a sodium hypochlorite storage chamber 32, a spraying pipeline 34 and an exhaust port 35. The sodium hypochlorite storage chamber 32 is placed at the rear side of the tail gas pipeline 1. The upper end of the sodium hypochlorite storage chamber 32 is connected to the rear end of the air supply pipeline 7. The upper part inside the sodium hypochlorite storage chamber 32 is provided with uniformly distributed spraying pipelines 34. The upper end of the sodium hypochlorite storage chamber 32 is fixedly connected with an exhaust port 35. The spraying mechanism 3 further includes a bolt plate type filler 33 and a support plate 36. A support plate 36 is arranged inside the sodium hypochlorite storage chamber 32. A bolt plate type filler 33 is placed on the upper end of the support plate 36. The bolt plate type filler 33 is located at the lower end of the connection port between the sodium hypochlorite storage chamber 32 and the air supply pipeline 7. The spraying mechanism 3 further includes a sodium hypochlorite pipeline 31. The lower end of the sodium hypochlorite storage chamber 32 is provided with a sodium hypochlorite pipeline 31. The tail gas removing carbon dioxide enters the inside of the sodium hypochlorite storage chamber 32 through the upper tail gas auxiliary pipeline 25 and the air supply pipeline 7. The spraying pipeline 34 feeds the lye through an external water pump. The lye is sprayed out by the spraying pipeline 34 and combines with the tail gas entering the inside of the sodium hypochlorite storage chamber 32. The chlorine gas in the tail gas combines with the lye to form a sodium hypochlorite solution. The sodium hypochlorite solution falls into the lower end inside the sodium hypochlorite storage chamber 32 after passing through the bolt plate type filler 33 and the support plate 36. The surface of the bolt plate type filler 33 is covered with lye, greatly increasing the contact area between the chlorine gas and the lye, improving the reaction efficiency of the chlorine gas. The tail gas removing chlorine gas enters the waste gas collection pipeline from the exhaust port 35.

[0027] The working principle of a device for generating sodium hypochlorite by absorbing carbon dioxide in chlorine-containing tail gas provided by the present utility model is as follows: Connect the tail gas discharge port of the production device to the tail gas pipeline 1, and the regeneration gas pipeline 6 is connected to the regeneration gas device. The exhaust port 35 is connected to the waste gas collection pipeline. Divide the two adsorption tanks 21 on the front side into group A, and the two adsorption tanks 21 on the rear side into group B. When the device for generating sodium hypochlorite by absorbing carbon dioxide in chlorine-containing tail gas is in operation, group A adsorbs carbon dioxide, and group B regenerates the adsorbent. The adsorption tanks 21 in group A close valve two 5 and valve four 9, and open valve one 4 and valve three 8. The adsorption tanks 21 in group B open valve two 5 and valve four 9, and close valve one 4 and valve three 8. When it is necessary to exchange the functions of the adsorption tanks 21 in groups A and B, just interchange the switch states of each valve. After the tail gas enters the interior of the adsorption tank 21 through the tail gas pipeline 1 in the adsorption tank 21 that adsorbs carbon dioxide, the tail gas passes through the adsorbent 23 between the two grid fixing plates 22, and the carbon dioxide is absorbed. Online analyzers are provided on the tail gas sub-pipelines 25 at the upper end of the adsorption tank 21 to detect the carbon dioxide concentration passing through the tail gas sub-pipelines 25 at the upper end, and judge whether it is necessary to exchange the functions of the adsorption tanks 21 in groups A and B. After the regeneration gas enters the interior of the adsorption tank 21 in the adsorption tank 21 for adsorbent regeneration, the adsorbent 23 between the two grid fixing plates 22 combines with the regeneration gas to realize the regeneration of the adsorbent 23. The excess regeneration gas is discharged through the regeneration gas sub-pipeline 24 at the upper end. The tail gas excluding carbon dioxide enters the interior of the sodium hypochlorite storage chamber 32 through the tail gas sub-pipeline 25 at the upper end and the air supply pipeline 7. The spray pipeline 34 sends the lye through an external water pump, and the lye is sprayed out by the spray pipeline 34 and combines with the tail gas entering the interior of the sodium hypochlorite storage chamber 32. The chlorine gas in the tail gas combines with the lye to form a sodium hypochlorite solution. The sodium hypochlorite solution falls into the lower end of the interior of the sodium hypochlorite storage chamber 32 through the bolt plate type packing 33 and the support plate 36. The surface of the bolt plate type packing 33 is covered with lye, which greatly increases the contact area between the chlorine gas and the lye, improves the reaction efficiency of the chlorine gas, and the tail gas removing chlorine gas enters the waste gas collection pipeline from the exhaust port 35.

[0028] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied to other related technical fields, shall be included in the patent protection scope of the present utility model by the same token.

Claims

1. An apparatus for generating sodium hypochlorite by absorbing carbon dioxide in chlorine-containing tail gas, characterized in that: It includes an exhaust gas pipeline (1), an adsorption mechanism (2) and a spraying mechanism (3); Exhaust gas pipeline (1): Valves one (4) symmetrically distributed left and right are connected by bolts on both the front and rear sides thereof; Adsorption mechanism (2): It includes an adsorption tank (21) and an exhaust gas auxiliary pipeline (25). The valves one (4) are respectively connected to the lower ends of the adsorption tanks (21) by bolts. Exhaust gas auxiliary pipelines (25) are provided at both the upper and lower ends of the relatively inner sides of two adjacent adsorption tanks (21). A gas supply pipeline (7) is connected by bolts between the exhaust gas auxiliary pipelines (25) at the upper ends through valves three (8); Spraying mechanism (3): It is placed at the rear side of the exhaust gas pipeline (1), and the middle part of the spraying mechanism (3) is communicated with the rear end of the gas supply pipeline (7).

2. The device for generating sodium hypochlorite by absorbing carbon dioxide in the chlorine-containing tail gas according to claim 1, wherein: The adsorption mechanism (2) further includes a grid fixing plate (22) and an adsorbent (23). Grid fixing plates (22) are provided at both the upper and lower ends inside the adsorption tank (21), and an adsorbent (23) is filled between the two grid fixing plates (22) in the same adsorption tank (21).

3. The device for generating sodium hypochlorite by absorbing carbon dioxide in chlorine-containing tail gas according to claim 2, wherein: The adsorbent (23) is a renewable amino solid adsorbent.

4. The device for generating sodium hypochlorite by absorbing carbon dioxide in chlorine-containing tail gas according to claim 1, wherein: The adsorption mechanism (2) further includes a regeneration gas auxiliary pipeline (24). Regeneration gas auxiliary pipelines (24) are provided at both the upper and lower ends of the outer sides facing away from each other of two adjacent adsorption tanks (21). A regeneration gas pipeline (6) is connected by bolts between the two regeneration gas auxiliary pipelines (24) adjacent to each other front and rear at the lower end, and a valve four (9) is connected by bolts to the regeneration gas auxiliary pipeline (24) at the upper end.

5. A device for generating sodium hypochlorite by absorbing carbon dioxide in chlorine-containing tail gas according to claim 1, characterized in that: The spraying mechanism (3) includes a sodium hypochlorite storage chamber (32), a spraying pipeline (34) and an exhaust port (35). The sodium hypochlorite storage chamber (32) is placed at the rear side of the exhaust gas pipeline (1). The upper end of the sodium hypochlorite storage chamber (32) is communicated with the rear end of the gas supply pipeline (7). Uniformly distributed spraying pipelines (34) are provided at the upper end inside the sodium hypochlorite storage chamber (32), and an exhaust port (35) is fixedly connected to the upper end of the sodium hypochlorite storage chamber (32).

6. The device for generating sodium hypochlorite by absorbing carbon dioxide in chlorine-containing tail gas according to claim 5, wherein: The spraying mechanism (3) further includes a bolt plate type filler (33) and a support plate (36). A support plate (36) is provided inside the sodium hypochlorite storage chamber (32), and a bolt plate type filler (33) is placed on the upper end of the support plate (36). The bolt plate type filler (33) is located at the lower end of the connection port between the sodium hypochlorite storage chamber (32) and the gas supply pipeline (7).

7. An apparatus for generating sodium hypochlorite by absorbing carbon dioxide in chlorine-containing tail gas according to claim 5, characterized in that: The spraying mechanism (3) further includes a sodium hypochlorite pipeline (31). A sodium hypochlorite pipeline (31) is provided at the lower end of the sodium hypochlorite storage chamber (32).

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