Absorption tower for sodium chlorite production

Abstract

An absorption tower for sodium chlorite production relates to the technical field of absorption towers and comprises a tower body, the tower body is provided with a gas distribution assembly and a liquid distribution assembly in parallel from top to bottom, and an upper absorption reaction assembly and a lower absorption reaction assembly are arranged in an area between the gas distribution assembly and the liquid distribution assembly. A filler is arranged between the upper absorption reaction assembly and the lower absorption reaction assembly, a plurality of upper rectangular channels are arranged on the upper surface of the filler in parallel, a plurality of lower rectangular channels are arranged on the lower surface of the filler in parallel, and the upper rectangular channels and the lower rectangular channels are arranged in a staggered manner; and the lower end part of the upper rectangular channel is communicated with the upper end part of the lower rectangular channel through an inclined channel. The utility model solves the problems that in the use process of an absorption tower in the prior art, the contact time between gas and liquid is short, the flow speed between the gas and the liquid is higher, the contact is insufficient, and the absorption reaction efficiency is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of absorption towers, in particular to an absorption tower for sodium chlorite production. Background Art

[0002] Sodium chlorite is a highly efficient oxidative bleaching agent, mainly used for bleaching silk fabrics, fibers, etc., treating drinking water and industrial wastewater, and can also be used in animal husbandry and breeding.

[0003] At present, in the sodium chlorite production process, the reaction absorption of chlorine dioxide needs to be reacted through a sodium chlorite reaction absorption tower. The liquid distributor used in the sodium chlorite reaction absorption tower in the prior art has a complex structure and high cost. In addition, when the gas is inlet, the gas is only introduced and ascended through the liquid inlet pipe without any guiding measures. The gas rises in a disorderly manner and the filler absorbs unevenly.

[0004] The prior art discloses a patent with a publication number of CN209735618U. The solution includes a tower body, a baffle layer, a liquid distribution plate, an upper packing layer, a lower packing layer and a liquid inlet pipe. An exhaust port is provided at the top of the tower body, an air inlet is provided at the lower side wall of the tower body, and a liquid discharge port is provided at the bottom of the tower body; a baffle layer, a liquid distribution plate, an upper packing layer and a lower packing layer are provided in sequence from top to bottom inside the tower body. Beneficial effects: simple structure, easy to implement; increased contact stroke of the mixed solution and chlorine dioxide gas, thereby improving the absorption efficiency of chlorine dioxide gas, and allowing hydrogen peroxide to fully react, reducing production costs, reducing exhaust gas emissions, protecting the environment, and at the same time improving the purity of the sodium chlorite product; realized the recovery of sodium chlorite and sodium hydroxide solution in the exhaust gas, avoiding waste of resources.

[0005] As the existing devices are used, the shortcomings of the technology are gradually exposed, mainly in the following aspects:

[0006] First, during use of the existing sodium chlorite absorption tower, the contact time between gas and liquid is short and the flow rate between gas and liquid is fast, resulting in insufficient contact and reducing the absorption reaction efficiency.

[0007] Second, the gas needs to be discharged from the absorption tower after contact with the liquid. This causes the discharge of liquid or gas that has not been fully absorbed, resulting in a waste of energy and making it impossible to carry out repeated absorption reactions.

[0008] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0009] In view of the defects in the prior art, the utility model solves the problems that in the use of the absorption tower in the traditional technology, the contact time between gas and liquid is short and the flow rate between gas and liquid is fast, resulting in insufficient contact and reduced absorption reaction efficiency; and the gas and liquid need to be discharged from the absorption tower after contact, which causes energy waste after the liquid or gas that has not been fully absorbed is discharged and makes it impossible to carry out repeated absorption reactions.

[0010] In order to solve the above problems, the utility model provides the following technical solutions:

[0011] An absorption tower for sodium chlorite production comprises a tower body, wherein a gas distribution component and a liquid distribution component are arranged in parallel from top to bottom of the tower body, an upper absorption reaction component and a lower absorption reaction component are arranged in the area between the gas distribution component and the liquid distribution component, a filler is arranged between the upper absorption reaction component and the lower absorption reaction component, a plurality of upper rectangular channels are arranged in parallel on the upper surface of the filler, a plurality of lower rectangular channels are arranged in parallel on the lower surface of the filler, the upper rectangular channels and the lower rectangular channels are arranged in a staggered manner, and the lower end of the upper rectangular channel is connected to the upper end of the lower rectangular channel through an inclined channel.

[0012] The upper end of the tower body is connected with a gas outlet, and the gas outlet is connected to the gas distribution assembly through a gas circulation pipe group.

[0013] The lower end of the tower body is connected with a liquid outlet cylinder, and the liquid outlet cylinder is connected with the liquid distribution component through a liquid circulation pipe group.

[0014] As an optimized solution, the gas circulation pipe group includes a first three-way valve connected to the gas outlet tube, the other two ports of the first three-way valve connect the gas circulation pipeline and the gas outlet pipeline, the other end of the gas circulation pipeline is connected to the second three-way valve, and the other two ports of the second three-way valve connect the gas distribution component and the gas source.

[0015] As an optimized solution, the liquid circulation pipe group includes a third three-way valve connected to the liquid outlet tube, the other two ports of the third three-way valve connect the liquid circulation pipeline and the liquid outlet pipeline, the other end of the liquid circulation pipeline is connected to the fourth three-way valve, and the other two ports of the fourth three-way valve connect the liquid distribution component and the liquid source.

[0016] As an optimized solution, a gas circulation pump body is connected to the gas circulation pipeline.

[0017] As an optimized solution, a liquid circulation pump body is connected to the liquid circulation pipeline.

[0018] As an optimized solution, the gas distribution assembly includes a central gas distribution disk, and a plurality of gas distribution ring pipes are sequentially mounted on the outer ring of the central gas distribution disk from the inside to the outside. The gas distribution ring pipes and the central gas distribution disk, as well as adjacent gas distribution ring pipes are connected by gas connecting pipes, and the upper wall of the gas distribution ring pipes is evenly provided with gas outlet holes.

[0019] As an optimized solution, an air pipe is connected to the central air distribution disk, and the inlet end of the air pipe is connected to the second three-way valve.

[0020] As an optimized solution, the liquid distribution component includes a central liquid distribution tray, and the outer ring of the central liquid distribution tray is sequentially mounted with a number of liquid distribution ring tubes from the inside to the outside. The liquid distribution ring tubes and the central liquid distribution tray, as well as adjacent liquid distribution ring tubes, are connected by liquid connecting tubes, and liquid outlet holes are evenly distributed on the lower peripheral wall of the liquid distribution ring tubes.

[0021] As an optimized solution, a liquid pipe is connected to the central liquid distribution tray, and the inlet end of the liquid pipe is connected to the fourth three-way valve.

[0022] As an optimized solution, the upper absorption reaction assembly includes upper plates fixedly connected to the inner wall of the tower body from top to bottom, each upper plate is evenly distributed with upper through holes, and the upper through holes of adjacent upper plates are staggered.

[0023] As an optimized solution, the lower absorption reaction assembly includes lower plates fixedly connected to the inner wall of the tower body from top to bottom, each lower plate is evenly distributed with lower through holes, and the lower through holes of adjacent lower plates are staggered.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] During normal use, the liquid source is evenly distributed through the liquid distribution component and flows downward, and the gas source is evenly distributed through the gas distribution component and flows upward. The upper absorption reaction component and the lower absorption reaction component realize uniform distribution of gas and liquid, and the staggered arrangement between the holes can reduce the flow rate of gas and liquid and increase the contact time.

[0026] By providing a filler, an upper rectangular channel, a lower rectangular channel and an inclined channel are provided on the filler to guide the liquid and the gas, slow down the liquid and the gas, increase the contact area and contact time in the inclined channel, and improve the absorption reaction efficiency;

[0027] The liquid distribution assembly and the gas distribution assembly are both provided with a plurality of annular tubes arranged sequentially from the inside to the outside. The annular tubes are used to achieve uniform distribution of gas and liquid, and the gaps between adjacent annular tubes can be used to ensure the normal flow of liquid and gas, thereby reducing the impact on the flow of gas and liquid.

[0028] When the gas and liquid are not sufficiently absorbed after contact, the first three-way valve and the second three-way valve are adjusted to allow the gas discharged from the air outlet tube to enter the gas circulation pipeline, and under the action of the gas circulation pump body, the gas passes through the second three-way valve and then enters the gas distribution component again to realize circulating air intake; similarly, the third three-way valve and the fourth three-way valve are adjusted to allow the liquid discharged from the liquid outlet tube to enter the liquid circulation pipeline, and under the action of the liquid circulation pump body, the gas passes through the fourth three-way valve and then enters the liquid distribution component again to realize circulating liquid intake, thereby realizing multiple cyclic contacts between liquid and gas and improving the absorption efficiency between gas and liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0030] Figure 1 It is a schematic diagram of the structure of the utility model;

[0031] Figure 2 It is a schematic diagram of the structure of the gas distribution component of the utility model.

[0032] In the figure: 1-tower body; 2-gas outlet cylinder; 3-liquid outlet cylinder; 4-first three-way valve; 5-gas circulation pipeline; 6-gas circulation pump body; 7-second three-way valve; 8-gas pipe; 9-central gas distribution plate; 10-gas distribution ring pipe; 11-gas connecting pipe; 12-gas outlet hole; 13-third three-way valve; 14-liquid circulation pipeline; 15-liquid circulation pump body; 16-fourth three-way valve; 17-liquid pipe; 18-central liquid distribution plate; 19-liquid distribution ring pipe; 20-liquid connecting pipe; 21-liquid outlet hole; 22-upper plate body; 23-upper through hole; 24-lower plate body; 25-lower through hole; 26-filler; 27-upper rectangular channel; 28-lower rectangular channel; 29-inclined channel. DETAILED DESCRIPTION

[0033] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0034] like Figure 1 and Figure 2 As shown, an absorption tower for sodium chlorite production includes a tower body 1, wherein a gas distribution component and a liquid distribution component are arranged side by side from top to bottom of the tower body 1, an upper absorption reaction component and a lower absorption reaction component are arranged in the area between the gas distribution component and the liquid distribution component, a filler 26 is arranged between the upper absorption reaction component and the lower absorption reaction component, a plurality of upper rectangular channels 27 are arranged side by side on the upper surface of the filler 26, a plurality of lower rectangular channels 28 are arranged side by side on the lower surface of the filler 26, the upper rectangular channels 27 and the lower rectangular channels 28 are arranged in a staggered manner, and the lower end of the upper rectangular channel 27 is connected to the upper end of the lower rectangular channel 28 through an inclined channel 29.

[0035] The upper end of the tower body 1 is connected with a gas outlet 2, which is connected to the gas distribution assembly through a gas circulation pipe group.

[0036] The lower end of the tower body 1 is connected with a liquid outlet cylinder 3, and the liquid outlet cylinder 3 is connected with a liquid distribution component through a liquid circulation pipe group.

[0037] The gas circulation pipe group includes a first three-way valve 4 connected to the gas outlet tube 2, the other two ports of the first three-way valve 4 are connected to the gas circulation pipeline 5 and the gas outlet pipeline, the other end of the gas circulation pipeline 5 is connected to the second three-way valve 7, and the other two ports of the second three-way valve 7 are connected to the gas distribution component and the gas source.

[0038] The liquid circulation pipe group includes a third three-way valve 13 connected to the liquid outlet tube 3, the other two ports of the third three-way valve 13 connect the liquid circulation pipeline 14 and the liquid outlet pipeline, the other end of the liquid circulation pipeline 14 is connected to the fourth three-way valve 16, and the other two ports of the fourth three-way valve 16 connect the liquid distribution component and the liquid source.

[0039] The gas circulation pipeline 5 is connected to a gas circulation pump body 6 .

[0040] The liquid circulation pipeline 14 is connected to a liquid circulation pump body 15 .

[0041] The gas distribution assembly includes a central gas distribution plate 9, and a plurality of gas distribution ring pipes 10 are sequentially mounted on the outer ring of the central gas distribution plate 9 from the inside to the outside. The gas distribution ring pipes 10 and the central gas distribution plate 9, as well as adjacent gas distribution ring pipes 10 are connected via gas connecting pipes 11, and gas outlet holes 12 are evenly distributed on the upper wall of the gas distribution ring pipes 10.

[0042] The central air distribution plate 9 is connected to an air pipe 8 , and the inlet end of the air pipe 8 is connected to the second three-way valve 7 .

[0043] The liquid distribution component includes a central liquid distribution plate 18, and a plurality of liquid distribution ring tubes 19 are sequentially mounted on the outer ring of the central liquid distribution plate 18 from the inside to the outside. The liquid distribution ring tubes 19 and the central liquid distribution plate 18, as well as adjacent liquid distribution ring tubes 19, are connected via liquid connecting tubes 20, and liquid outlet holes 21 are evenly distributed on the lower peripheral wall of the liquid distribution ring tubes 19.

[0044] A liquid pipe 17 is connected to the central liquid distribution tray 18 , and an inlet end of the liquid pipe 17 is connected to the fourth three-way valve 16 .

[0045] The upper absorption reaction assembly includes upper plates 22 fixedly connected to the inner wall of the tower body 1 in parallel from top to bottom. Upper through holes 23 are evenly distributed on each upper plate 22, and the upper through holes 23 of adjacent upper plates 22 are staggered.

[0046] The lower absorption reaction assembly includes lower plates 24 fixedly connected to the inner wall of the tower body 1 in parallel from top to bottom. Lower through holes 25 are evenly distributed under each lower plate 24, and the lower through holes 25 of adjacent lower plates 24 are arranged in a staggered manner.

[0047] The working principle of this device is:

[0048] During normal use, the liquid source is evenly distributed through the liquid distribution component and flows downward, and the gas source is evenly distributed through the gas distribution component and flows upward. The upper absorption reaction component and the lower absorption reaction component realize uniform distribution of gas and liquid, and the staggered arrangement between the holes can reduce the flow rate of gas and liquid and increase the contact time.

[0049] By providing a filler 26, an upper rectangular channel 27, a lower rectangular channel 28 and an inclined channel 29 are provided on the filler 26 to guide the liquid and the gas, slow down the liquid and the gas, increase the contact area and contact time in the inclined channel 29, and improve the absorption reaction efficiency;

[0050] The liquid distribution assembly and the gas distribution assembly are both provided with a plurality of annular tubes arranged sequentially from the inside to the outside. The annular tubes are used to achieve uniform distribution of gas and liquid, and the gaps between adjacent annular tubes can be used to ensure the normal flow of liquid and gas, thereby reducing the impact on the flow of gas and liquid.

[0051] When the gas and liquid are not sufficiently absorbed after contact, the first three-way valve 4 and the second three-way valve 7 are adjusted to allow the gas discharged from the air outlet tube 2 to enter the gas circulation pipeline 5, and under the action of the gas circulation pump body 6, the gas passes through the second three-way valve 7 and then enters the gas distribution component again to realize circulating air intake; similarly, the third three-way valve 13 and the fourth three-way valve 16 are adjusted to allow the liquid discharged from the liquid outlet tube 3 to enter the liquid circulation pipeline 14, and under the action of the liquid circulation pump body 15, the gas passes through the fourth three-way valve 16 and then enters the liquid distribution component again to realize circulating liquid intake, thereby realizing multiple cyclic contact between liquid and gas and improving the absorption efficiency between gas and liquid.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. An absorption tower for sodium chlorite production, characterized in that: The tower body (1) comprises a gas distribution component and a liquid distribution component arranged in parallel from top to bottom of the tower body (1); an upper absorption reaction component and a lower absorption reaction component are arranged in the area between the gas distribution component and the liquid distribution component; a filler (26) is arranged between the upper absorption reaction component and the lower absorption reaction component; a plurality of upper rectangular channels (27) are arranged in parallel on the upper surface of the filler (26); a plurality of lower rectangular channels (28) are arranged in parallel on the lower surface of the filler (26); the upper rectangular channels (27) and the lower rectangular channels (28) are arranged in a staggered manner; the lower end of the upper rectangular channel (27) and the upper end of the lower rectangular channel (28) are connected via an inclined channel (29); The upper end of the tower body (1) is connected to a gas outlet cylinder (2), and the gas outlet cylinder (2) is connected to the gas distribution assembly via a gas circulation pipe group. The lower end of the tower body (1) is connected to a liquid outlet cylinder (3), and the liquid outlet cylinder (3) is connected to the liquid distribution component via a liquid circulation pipe group.

2. The sodium chlorite production absorption tower according to claim 1, characterized in that: The gas circulation pipe group comprises a first three-way valve (4) connected to the gas outlet tube (2), the other two ports of the first three-way valve (4) are connected to the gas circulation pipeline (5) and the gas outlet pipeline, the other end of the gas circulation pipeline (5) is connected to the second three-way valve (7), and the other two ports of the second three-way valve (7) are connected to the gas distribution component and the gas source.

3. The sodium chlorite production absorption tower according to claim 2, characterized in that: The liquid circulation pipe group includes a third three-way valve (13) connected to the liquid outlet cylinder (3), the other two ports of the third three-way valve (13) are connected to the liquid circulation pipeline (14) and the liquid outlet pipeline, the other end of the liquid circulation pipeline (14) is connected to the fourth three-way valve (16), and the other two ports of the fourth three-way valve (16) are connected to the liquid distribution component and the liquid source.

4. The sodium chlorite production absorption tower according to claim 3, characterized in that: The gas circulation pipeline (5) is connected to a gas circulation pump body (6), and the liquid circulation pipeline (14) is connected to a liquid circulation pump body (15).

5. The sodium chlorite production absorption tower according to claim 4, characterized in that: The gas distribution assembly comprises a central gas distribution plate (9), and a plurality of gas distribution ring pipes (10) are sequentially mounted on the outer ring of the central gas distribution plate (9) from the inside to the outside. The gas distribution ring pipes (10) and the central gas distribution plate (9), as well as adjacent gas distribution ring pipes (10), are connected via gas connecting pipes (11), and gas outlet holes (12) are evenly distributed on the upper wall of the gas distribution ring pipe (10).

6. The sodium chlorite production absorption tower according to claim 5, characterized in that: The central air distribution plate (9) is connected to an air pipe (8), and the inlet end of the air pipe (8) is connected to the second three-way valve (7).

7. The sodium chlorite production absorption tower according to claim 6, characterized in that: The liquid distribution component comprises a central liquid distribution plate (18), the outer ring of which is sequentially provided with a plurality of liquid distribution ring tubes (19) from the inside to the outside. The liquid distribution ring tubes (19) and the central liquid distribution plate (18), as well as adjacent liquid distribution ring tubes (19), are connected via liquid connecting tubes (20), and liquid outlet holes (21) are evenly distributed on the lower peripheral wall of the liquid distribution ring tubes (19).

8. The sodium chlorite production absorption tower according to claim 7, characterized in that: The central liquid distribution tray (18) is connected to a liquid pipe (17), and the inlet end of the liquid pipe (17) is connected to the fourth three-way valve (16).

9. The sodium chlorite production absorption tower according to claim 8, characterized in that: The upper absorption reaction assembly comprises upper disk bodies (22) fixedly connected to the inner wall of the tower body (1) in parallel from top to bottom, each of the upper disk bodies (22) is evenly distributed with upper through holes (23), and the upper through holes (23) of adjacent upper disk bodies (22) are arranged in a staggered manner.

10. The sodium chlorite production absorption tower according to claim 9, characterized in that: The lower absorption reaction assembly comprises lower plates (24) fixedly connected to the inner wall of the tower body (1) in parallel from top to bottom, each lower plate (24) is evenly distributed with lower through holes (25), and the lower through holes (25) of adjacent lower plates (24) are arranged in a staggered manner.

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