Alkali washing tower

Abstract

The utility model discloses an alkaline washing tower and relates to the technical field of flue gas purification equipment. According to the main technical scheme, a washing cavity is formed in a tower body, and an air outlet is formed in the upper end of the tower body and communicated with the washing cavity; an air inlet pipe, a first liquid inlet pipe and a return pipe are arranged on the side wall of the tower body and are all communicated with the washing cavity; a first liquid inlet pump is arranged on the first liquid inlet pipe, and a discharge port of the first liquid inlet pipe is located below the air outlet; a discharge port of the air inlet pipe is located below a discharge port of the first liquid inlet pipe, and a feed port of the return pipe is located below a discharge port of the air inlet pipe; a settling zone is arranged at the lower end of the washing cavity; a feeding hole of the return pipe is positioned above the settling zone; and the alkali liquor pool is communicated with the first liquid inlet pipe and the return pipe. The purposes of reducing resource waste and improving the alkali liquor utilization rate are achieved. The purposes of effectively reducing the amount of impurities in the alkali liquor, improving the circulating washing effect, reducing the risk that the impurities such as tar are adsorbed in the pipeline and improving the conveying efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas purification equipment, in particular to an alkali washing tower. Background Art

[0002] Alkali washing tower is also called acid-base washing tower, and its full name is acid-base waste gas neutralization treatment tower. It is a kind of equipment for environmentally purifying waste gas generated by industrial production.

[0003] The working principle of the alkaline washing tower is based on acid-base neutralization. Generally, it treats chemical substances that are more easily soluble in water, and uses sodium hydroxide and other absorption neutralization liquids to purify acid mist waste gas. After the acid-base waste gas is led out from the air duct, it enters the waste gas neutralization treatment tower, flows upward to the filter material layer, and contacts and reacts with the neutralization liquid sprayed from the nozzle. The absorbed waste gas continues to flow upward, then passes through the swirl plate, and is discharged by the wind cap and exhaust pipe or fan for purification. The washing liquid flowing down from the tower is then lifted to the top of the tower by a water pump and continuously recycled. After the circulating washing liquid reaches a certain concentration, it is discharged to the sewage treatment station.

[0004] Most flue gases contain a lot of tar. During the spray washing process, the tar will enter the washing liquid. When the washing liquid is circulated, the tar in the washing liquid is easily adsorbed in the pipeline, affecting the transmission efficiency. At the same time, the tar in the washing liquid will affect the effect of the cyclic washing. Utility Model Content

[0005] The utility model aims to provide an alkali washing tower, which can effectively reduce the amount of impurities in the alkali solution, thereby improving the circulation washing effect, reducing the risk of impurities such as tar being adsorbed in the pipeline, and improving the transportation efficiency.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A caustic washing tower comprises a tower body and an alkali liquid pool, wherein a washing chamber is provided inside the tower body, and an air outlet is provided at the upper end of the tower body, and the air outlet is connected to the washing chamber; an air inlet pipe, a first liquid inlet pipe and a reflux pipe are provided on the side wall of the tower body, and the first liquid inlet pipe, the air inlet pipe and the reflux pipe are all connected to the washing chamber; a first liquid inlet pump is provided on the first liquid inlet pipe, and the outlet of the first liquid inlet pipe is located below the air outlet; the outlet of the air inlet pipe is located below the outlet of the first liquid inlet pipe, and the feed inlet of the reflux pipe is located below the outlet of the air inlet pipe; wherein a sedimentation area is provided at the lower end of the washing chamber, and the feed inlet of the reflux pipe is located above the sedimentation area; the alkali liquid pool is connected to the feed inlet of the first liquid inlet pipe and the outlet of the reflux pipe.

[0008] A further technical solution is: a first cleaning pipe is further provided on the side wall of the tower body; a first valve is provided on the first cleaning pipe, and a feed inlet of the first cleaning pipe is connected to the precipitation area.

[0009] A further technical solution is: the discharge port of the first cleaning pipe is connected to the alkali liquid pool; a second valve is provided on the first liquid inlet pipe, and a second cleaning pipe is connected to the first liquid inlet pipe; the second cleaning pipe is located between the second valve and the first liquid inlet pump, the second cleaning pipe is connected to the first liquid inlet pipe, and a third valve is provided on the second cleaning pipe.

[0010] A further technical solution is: the alkali washing tower also includes a second liquid inlet pipe; the feed port of the second liquid inlet pipe is connected to the first liquid inlet pipe, and the feed port of the second liquid inlet pipe is located between the first liquid inlet pump and the alkali washing tank; the first discharge port of the second liquid inlet pipe is connected to the first liquid inlet pipe, and the first discharge port of the second liquid inlet pipe is located between the second valve and the first liquid inlet pump; the second discharge port of the second liquid inlet pipe is connected to the feed port of the second cleaning pipe; the second liquid inlet pipe is provided with a second liquid inlet pump and a fourth valve; the first liquid inlet pipe is provided with a fifth valve, and the fifth valve is located between the first discharge port of the second liquid inlet pipe and the feed port of the second liquid inlet pipe.

[0011] A further technical solution is: a filter material layer is arranged in the washing chamber; the filter material layer is located between the outlet of the air inlet pipe and the outlet of the first liquid inlet pipe.

[0012] A further technical solution is: a cyclone plate is arranged in the washing chamber; the cyclone plate is located between the air outlet and the filter material layer.

[0013] A further technical solution is: the gas outlet is connected to a gas-liquid separation tank.

[0014] A further technical solution is that a liquid inlet is arranged at the upper end of the alkali solution pool.

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

[0016] On the one hand, the alkali liquid after precipitation treatment can be introduced into the alkali liquid pool, and returned to the washing chamber by the first liquid inlet pipe and the first liquid inlet pump, thereby reducing resource waste and improving the utilization rate of the alkali liquid. On the other hand, the alkali liquid after precipitation treatment can effectively reduce the amount of impurities in the alkali liquid, thereby achieving the purpose of improving the circulation washing effect. At the same time, the risk of impurities such as tar being adsorbed in the pipeline can be reduced, thereby achieving the purpose of improving the transportation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a schematic diagram of the structure of an alkali washing tower in this embodiment;

[0018] Figure 2 This is a schematic diagram of the front structure of an alkali washing tower in this embodiment;

[0019] Figure 3 It is a right side structural schematic diagram of a caustic washing tower in this embodiment;

[0020] Figure 4 Schematic diagram of the top view of a caustic washing tower in this embodiment;

[0021] Figure 5 It is a process schematic diagram of an alkali washing tower in this embodiment.

[0022] Marks and corresponding parts names in the attached drawings:

[0023] 1-tower body; 2-washing chamber; 3-air outlet; 4-air inlet pipe; 5-first liquid inlet pipe; 6-reflux pipe; 7-first liquid inlet pump; 8-sedimentation area; 9-alkali liquid pool; 10-first valve; 11-second valve; 12-second cleaning pipe; 13-third valve; 14-second liquid inlet pipe; 15-second liquid inlet pump; 16-fourth valve; 17-fifth valve; 18-filter material layer; 19-cyclone plate; 20-gas-liquid separation tank; 21-liquid inlet; 22-first cleaning pipe. DETAILED DESCRIPTION

[0024] The utility model will be further described below in conjunction with the accompanying drawings.

[0025] Example 1

[0026] The present embodiment provides an alkali washing tower, comprising a tower body 1 and an alkali liquid pool 9, wherein a washing chamber 2 is provided inside the tower body 1, and an air outlet 3 is provided at the upper end of the tower body 1, and the air outlet 3 is communicated with the washing chamber 2; an air inlet pipe 4, a first liquid inlet pipe 5 and a reflux pipe 6 are provided on the side wall of the tower body 1, and the first liquid inlet pipe 5, the air inlet pipe 4 and the reflux pipe 6 are all communicated with the washing chamber 2; a first liquid inlet pump 7 is provided on the first liquid inlet pipe 5, and the discharge port of the first liquid inlet pipe 5 is located below the air outlet 3; the discharge port of the air inlet pipe 4 is located below the discharge port of the first liquid inlet pipe 5, and the feed port of the reflux pipe 6 is located below the discharge port of the air inlet pipe 4; wherein a sedimentation area 8 is provided at the lower end of the washing chamber 2, and the feed port of the reflux pipe 6 is located above the sedimentation area 8; the alkali liquid pool 9 is communicated with the feed port of the first liquid inlet pipe 5 and the discharge port of the reflux pipe 6.

[0027] Exemplarily, during the implementation process, a washing chamber 2 is provided inside the tower body 1, a first liquid inlet pipe 5 (for conveying alkali solution) is provided on the side wall of the tower body 1, the first liquid inlet pipe 5 is connected to the washing chamber 2, a feed port of the first liquid inlet pipe 5 is connected to the alkali solution pool 9, and a first liquid inlet pump 7 is provided on the first liquid inlet pipe 5. When the first liquid inlet pump 7 is running, the alkali solution in the alkali solution pool 9 is conveyed to the washing chamber 2.

[0028] An air inlet pipe 4 is also provided on the side wall of the tower body 1. The air inlet pipe 4 is connected to the washing chamber 2. The feed port of the air inlet pipe 4 is used to connect to the gas recovery device so that the gas can enter the washing chamber 2 through the air inlet pipe 4. The discharge port of the air inlet pipe 4 is located below the discharge port of the first liquid inlet pipe 5. In the process of the gas entering the washing chamber 2 through the air inlet pipe 4 and flowing to the upper end of the washing chamber 2, the gas can be fully mixed and reacted with the alkali liquid sprayed from the first liquid inlet pipe 5, so as to improve the removal rate of acidic or harmful components in the gas.

[0029] A gas outlet 3 is provided at the upper end of the tower body 1 , and the gas outlet 3 is located above the first liquid inlet pipe 5 , so as to ensure that the treated gas can flow out of the tower body 1 through the gas outlet 3 .

[0030] A precipitation zone 8 is provided at the bottom of the washing chamber 2. After the alkali solution reacts with the gas, it flows into the precipitation zone 8 at the bottom of the washing chamber 2 and precipitates in the precipitation zone 8, thereby achieving the purpose of precipitating impurities such as tar in the alkali solution.

[0031] The side wall of the tower body 1 is also provided with a reflux pipe 6, the feed port of the reflux pipe 6 is located between the discharge port of the air inlet pipe 4 and the precipitation zone 8, and the discharge end of the reflux pipe 6 is connected to the alkali liquid pool 9. On the one hand, the alkali liquid after precipitation treatment can be introduced into the alkali liquid pool 9, and returned to the washing chamber 2 by the first liquid inlet pipe 5 and the first liquid inlet pump 7, thereby reducing resource waste and improving the utilization rate of the alkali liquid. On the other hand, the alkali liquid after precipitation treatment can effectively reduce the amount of impurities in the alkali liquid, thereby achieving the purpose of improving the circulation washing effect. At the same time, the risk of impurities such as tar being adsorbed in the pipeline can be reduced, thereby achieving the purpose of improving the transportation efficiency.

[0032] In order to enable the reflux pipe 6 to reflux the alkali solution in the washing chamber 2 into the alkali solution pool 9 , the alkali solution pool 9 may be disposed below the reflux pipe 6 , or a liquid inlet pump may be installed on the reflux pipe 6 .

[0033] Example 2

[0034] On the basis of the above-mentioned embodiment 1, in this embodiment, the side wall of the tower body 1 is further provided with a first cleaning pipe 22 ; a first valve 10 is provided on the first cleaning pipe 22 , and a feed port of the first cleaning pipe 22 is connected to the precipitation zone 8 .

[0035] For example, during the implementation, the side wall of the tower body 1 is further provided with a first cleaning pipe 22, and the feed port of the first cleaning pipe 22 is connected to the precipitation zone 8. The purpose of using the first cleaning pipe 22 to effectively remove the scale in the precipitation zone 8 is achieved.

[0036] The first valve 10 is installed on the first cleaning pipe 22. When performing gas washing, the first valve 10 is closed first, and then the gas and alkali solution are introduced into the washing chamber 2. At this time, the alkali solution can be precipitated in the precipitation area 8, and the precipitated alkali solution can be refluxed into the alkali solution pool 9 through the reflux pipe 6. Thereby, the risk of the washing liquid being lost through the first cleaning pipe 22 is reduced. When it is necessary to clean the scale in the precipitation area 8, the gas washing work is stopped first, and then the first valve 10 is opened. At this time, the scale in the precipitation area 8 can be cleaned through the first cleaning pipe 22 to restore the normal function of the precipitation area 8 and maintain the efficient operation of the alkali washing tower. At the same time, through the cooperation between the first cleaning pipe 22 and the first valve 10, it is convenient for the operator to open the first valve 10 as needed to effectively clean the precipitation area 8 regularly or irregularly, thereby reducing the accumulation of scale caused by long-term operation.

[0037] Example 3

[0038] On the basis of the above-mentioned Example 2, in this embodiment, the discharge port of the first cleaning pipe 22 is connected to the alkali liquid pool 9; a second valve 11 is provided on the first liquid inlet pipe 5, and a second cleaning pipe 12 is connected to the first liquid inlet pipe 5; the second cleaning pipe 12 is located between the second valve 11 and the first liquid inlet pump 7, the second cleaning pipe 12 is connected to the first liquid inlet pipe 5, and a third valve 13 is provided on the second cleaning pipe 12.

[0039] Exemplarily, during the implementation process, the discharge port of the first cleaning pipe 22 is connected to the alkali liquid pool 9, the second valve 11 is provided on the first liquid inlet pipe 5, and the second cleaning pipe 12 is connected to the first liquid inlet pipe 5. The second cleaning pipe 12 is located between the second valve 11 and the first liquid inlet pump 7, and the third valve 13 is provided on the second cleaning pipe 12. When it is necessary to clean the scale in the sedimentation area 8 or replace the alkali solution, the second valve 11 can be closed, and the first valve 10 and the third valve 13 can be opened, and then the precipitate or alkali solution in the sedimentation area 8 can be removed by passing through the first cleaning pipe 22, the first liquid inlet pipe 5 and the second cleaning pipe 12 in sequence by the pressure of the first liquid inlet pump 7, so as to achieve the purpose of cleaning the sedimentation area 8, the inside of the first cleaning pipe 22, the inside of the first liquid inlet pipe 5 and the inside of the second cleaning pipe 12, and replacing the alkali solution. When it is necessary to transfer the alkali solution, the second valve 11 can be opened, and the first valve 10 and the third valve 13 can be closed.

[0040] Example 4

[0041] On the basis of the above-mentioned Example 3, in this embodiment, the alkali washing tower also includes a second liquid inlet pipe 14; the feed port of the second liquid inlet pipe 14 is connected to the first liquid inlet pipe 5, and the feed port of the second liquid inlet pipe 14 is located between the first liquid inlet pump 7 and the alkali washing tank; the first discharge port of the second liquid inlet pipe 14 is connected to the first liquid inlet pipe 5, and the first discharge port of the second liquid inlet pipe 14 is located between the second valve 11 and the first liquid inlet pump 7; the second discharge port of the second liquid inlet pipe 14 is connected to the feed port of the second cleaning pipe 12; the second liquid inlet pipe 14 is provided with a second liquid inlet pump 15 and a fourth valve 16; the first liquid inlet pipe 5 is provided with a fifth valve 17, and the fifth valve 17 is located between the first discharge port of the second liquid inlet pipe 14 and the feed port of the second liquid inlet pipe 14.

[0042] Exemplarily, during the implementation process, the alkali washing tower also includes a second liquid inlet pipe 14, which is connected to the first liquid inlet pipe 5, and the feed port of the second liquid inlet pipe 14 is located between the first liquid inlet pump 7 and the alkali liquid pool 9. The first discharge port of the second liquid inlet pipe 14 is communicated with the first liquid inlet pipe 5, and the first discharge port of the second liquid inlet pipe 14 is located between the first liquid inlet pump 7 and the alkali liquid pool 9. The second discharge port of the second liquid inlet pipe 14 is communicated with the feed port of the second cleaning pipe 12. The second liquid inlet pipe 14 is provided with a second liquid inlet pump 15 and a fourth valve 16, and the first liquid inlet pipe 5 is provided with a fifth valve 17, and the fifth valve 17 is located between the first discharge port of the second liquid inlet pipe 14 and the feed port of the second liquid inlet pipe 14. When the first liquid inlet pipe 5 needs to be used, the second liquid inlet pump 15 and the fourth valve 16 are closed, and the first liquid inlet pump 7 and the fifth valve 17 are opened. When the second liquid inlet pipe 14 is needed, the second liquid inlet pump 15 and the fourth valve 16 are opened, and the first liquid inlet pump 7 and the fifth valve 17 are closed. Through the second liquid inlet pipe 14, and the second liquid inlet pump 15 and the fourth valve 16 on the second liquid inlet pipe 14, a backup path is provided for alkali liquid supply and sediment cleaning, so that when the first liquid inlet pipe 5 or the second liquid inlet pipe 14 fails, the alkali washing tower can be maintained in normal operation through another liquid inlet pipe, so as to enhance the stability and reliability of the system.

[0043] Example 5

[0044] On the basis of the above-mentioned embodiment 1, in this embodiment, a filter material layer 18 is provided in the washing chamber 2 ; the filter material layer 18 is located between the outlet of the air inlet pipe 4 and the outlet of the first liquid inlet pipe 5 .

[0045] Exemplarily, during the implementation process, one or more filter material layers 18 are installed inside the washing chamber 2 by screwing, gluing, etc. The filter material layer 18 is located between the gas outlet 3 and the outlet of the first liquid inlet pipe 5. The filter material layer 18 can be composed of porous filter material (such as quartz sand, anthracite, etc.). When the gas passes through the filter material layer 18, the gas is fully mixed with the alkali solution sprayed from the first liquid inlet pipe 5. The porous structure of the filter material layer 18 increases the contact time and surface area of ​​the gas and alkali solution reaction, making the alkali washing process more thorough, thereby achieving the purpose of effectively improving the removal rate of pollutants in the gas.

[0046] Example 6

[0047] On the basis of the above-mentioned embodiment 5, in this embodiment, a cyclone plate 19 is provided in the washing chamber 2 ; the cyclone plate 19 is located between the air outlet 3 and the filter material layer 18 .

[0048] Exemplarily, in the implementation process, a cyclone plate 19 is provided inside the washing chamber 2 by welding, screwing, etc., between the gas outlet 3 and the filter material layer 18, so as to quickly transmit the gas washed with alkali solution to the gas outlet 3 to improve the purification efficiency.

[0049] Example 7

[0050] On the basis of the above-mentioned embodiment 1, in this embodiment, the gas outlet 3 is connected to a gas-liquid separation tank 20 .

[0051] Exemplarily, during the implementation process, the gas outlet 3 of the alkali scrubber is connected to a gas-liquid separation tank 20. The gas-liquid separation tank 20 captures excess alkali droplets and other liquid residues carried out from the scrubbing chamber 2, ensuring that the gas reaches a dry or nearly dry state before being discharged, so as to effectively remove droplets in the gas and reduce the risk of pollution to the external environment caused by alkali or other liquid pollutants carried by the gas.

[0052] Example 8

[0053] On the basis of the above-mentioned embodiment 1, in this embodiment, a liquid inlet 21 is provided at the upper end of the alkali liquid pool 9 .

[0054] Exemplarily, during the implementation process, a liquid inlet 21 is provided at the upper end of the alkali solution pool 9 to facilitate the replenishment of the alkali solution.

[0055] Although the utility model is described herein with reference to a plurality of illustrative embodiments of the utility model, it should be understood that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the disclosure, drawings, and claims of the present application, various modifications and improvements may be made to the components and / or layout of the subject combination layout. In addition to modifications and improvements to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A caustic washing tower, characterized in that: include: A tower body (1), wherein a washing chamber (2) is provided inside the tower body (1), and an air outlet (3) is provided at the upper end of the tower body (1), wherein the air outlet (3) is communicated with the washing chamber (2); an air inlet pipe (4), a first liquid inlet pipe (5) and a return pipe (6) are provided on the side wall of the tower body (1), wherein the first liquid inlet pipe (5), the air inlet pipe (4) and the return pipe (6) are all communicated with the washing chamber (2); and a first liquid inlet pipe (5) is provided on the upper side of the tower body (1). A first liquid inlet pump (7) is provided, and the discharge port of the first liquid inlet pipe (5) is located below the gas outlet (3); the discharge port of the gas inlet pipe (4) is located below the discharge port of the first liquid inlet pipe (5), and the feed port of the reflux pipe (6) is located below the discharge port of the gas inlet pipe (4); wherein a sedimentation zone (8) is provided at the lower end of the washing chamber (2), and the feed port of the reflux pipe (6) is located above the sedimentation zone (8); An alkali liquid pool (9), wherein the alkali liquid pool (9) is connected to the feed port of the first liquid feed pipe (5) and the discharge port of the reflux pipe (6).

2. The alkali washing tower according to claim 1, characterized in that: The side wall of the tower body (1) is also provided with a first cleaning pipe (22); The first cleaning pipe (22) is provided with a first valve (10), and the feed inlet of the first cleaning pipe (22) is connected to the precipitation zone (8).

3. The alkali washing tower according to claim 2, characterized in that: The discharge port of the first cleaning pipe (22) is connected to the alkali solution pool (9); The first liquid inlet pipe (5) is provided with a second valve (11), and the first liquid inlet pipe (5) is connected to a second cleaning pipe (12); The second cleaning pipe (12) is located between the second valve (11) and the first liquid inlet pump (7), the second cleaning pipe (12) is connected to the first liquid inlet pipe (5), and a third valve (13) is provided on the second cleaning pipe (12).

4. The alkali washing tower according to claim 3, characterized in that: It also includes a second liquid inlet pipe (14); The feed port of the second liquid inlet pipe (14) is connected to the first liquid inlet pipe (5), and the feed port of the second liquid inlet pipe (14) is located between the first liquid inlet pump (7) and the alkali liquid pool; the first discharge port of the second liquid inlet pipe (14) is connected to the first liquid inlet pipe (5), and the first discharge port of the second liquid inlet pipe (14) is located between the second valve (11) and the first liquid inlet pump (7); the second discharge port of the second liquid inlet pipe (14) is connected to the feed port of the second cleaning pipe (12); the second liquid inlet pipe (14) is provided with a second liquid inlet pump (15) and a fourth valve (16); The first liquid inlet pipe (5) is provided with a fifth valve (17), and the fifth valve (17) is located between the first outlet of the second liquid inlet pipe (14) and the inlet of the second liquid inlet pipe (14).

5. The alkali washing tower according to claim 1, characterized in that: A filter material layer (18) is provided in the washing chamber (2); The filter material layer (18) is located between the outlet of the air inlet pipe (4) and the outlet of the first liquid inlet pipe (5).

6. The alkali washing tower according to claim 5, characterized in that: A cyclone plate (19) is provided in the washing chamber (2); The swirl plate (19) is located between the air outlet (3) and the filter material layer (18).

7. The alkali washing tower according to claim 1, characterized in that: The gas outlet (3) is connected to a gas-liquid separation tank (20).

8. The alkali washing tower according to claim 1, characterized in that: The upper end of the alkali solution pool (9) is provided with a liquid inlet (21).

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