Acid mist absorption device

Abstract

The utility model discloses an acid mist absorption device which comprises a first filter used for receiving acid gas, and the first filter comprises a first containing cavity used for storing water which is used for filtering the acid gas; the second filter is used for receiving the acid gas subjected to water filtration, the second filter comprises a second containing cavity which can be communicated with the first containing cavity, and alkali liquor is stored in the second containing cavity and used for filtering the acid gas subjected to water filtration. According to the acid gas filtering device, the use amount of alkali liquor can be reduced while the acid gas filtering effect is ensured, so that the treatment cost of the acid gas is reduced.

Description

Technical Field

[0001] The utility model relates to the field of acid gas treatment, in particular to an acid mist absorption device. Background Art

[0002] Chemical, petroleum, electric power, metallurgy, medicine, water treatment, and other fields often generate harmful gases (such as acidic gases) during production, processing, and treatment. These gases can corrode equipment, instruments, and buildings, shortening their service life and causing serious economic losses. In addition, these harmful gases can also have adverse effects on the environment and the health of workers. Therefore, these harmful gases need to be treated before they are discharged.

[0003] For example, hydrochloric acid forms acidic gases when it evaporates. Currently, the primary treatment for this acidic gas is an acid mist absorber, which contains an alkaline solution (such as sodium hydroxide). This solution reacts with the acidic gas to produce an acid-base neutralization reaction, reducing the acidity of the gas and allowing it to be released into the air. However, this method requires a large amount of alkaline solution, which is costly and uneconomical. Utility Model Content

[0004] The purpose of the present invention is to solve the problem of high cost of using the current acid mist absorption device. The present invention provides an acid mist absorption device that can reduce the amount of alkali solution used while ensuring the filtering effect of acid gas, thereby reducing the cost of treating the acid gas.

[0005] To solve the above technical problems, the embodiment of the present utility model discloses an acid mist absorption device for filtering acid gas, comprising:

[0006] A first filter is configured to receive the acid gas, wherein the first filter comprises:

[0007] The first accommodating chamber stores water, and the water is used to filter the acid gas;

[0008] a second filter, configured to receive the acidic gas filtered by the water, the second filter comprising:

[0009] The second accommodating chamber can be communicated with the first accommodating chamber. The second accommodating chamber stores alkaline solution, and the alkaline solution is used to filter the acidic gas after being filtered by the water.

[0010] The above technical solution uses water and alkaline solution to perform a dual filtration of acidic gases. Water is first used to perform a first filtration of the acidic gases to reduce their acidity, and then the alkaline solution is used to perform a second filtration of the acidic gases filtered by water. Because the acidic gases have already been reduced in acidity by the water before being filtered by the alkaline solution, the amount of alkaline solution used is significantly reduced, and the cost of water is much lower than that of alkaline solution. Therefore, the acid mist absorption device provided in the embodiments of the present application effectively reduces the cost of acidic gas treatment while ensuring effective acidic gas treatment, resulting in excellent economic efficiency.

[0011] According to a specific embodiment of the present invention, it also includes:

[0012] Connecting pipes, including:

[0013] a first end connected to the first filter, wherein the first end is located above the liquid level of the water in the first accommodating chamber along a height direction;

[0014] The second end is connected to the second filter, and along the height direction, the second end is located below the liquid level of the alkali solution in the second accommodating cavity.

[0015] According to a specific embodiment of the present invention, it also includes:

[0016] Sour Gas Transportation Department;

[0017] an air inlet pipe connected to the acid gas delivery portion, the air inlet pipe comprising a connecting end connected to the first filter, and the air inlet pipe capable of communicating with the first accommodating chamber;

[0018] Along the height direction, the connection end is located below the liquid surface of the water, and the air inlet pipe is used to transport the acidic gas to the first accommodating chamber.

[0019] Because the density of acidic gas is lower than that of water and alkali solution, it tends to flow upward relative to the water and alkali solution. With this technical solution, since the connection end of the acidic gas transport unit is located below the water surface, upon entering the first containment chamber, the acidic gas will inevitably flow upward, passing through the water to reach above the surface, completing the first stage of filtration. The acidic gas then flows through the connecting pipe into the second containment chamber. Since the second end of the connecting pipe is located below the alkali solution surface, upon entering the second containment chamber, the acidic gas will inevitably flow upward, passing through the alkali solution to reach above the surface, completing the second stage of filtration, and finally being discharged into the ambient air through the first exhaust pipe.

[0020] According to a specific embodiment of the present invention, the second filter includes:

[0021] The first exhaust pipe is provided on the top of the second filter, and is used to discharge the acidic gas filtered by the alkali solution out of the second accommodating cavity.

[0022] According to a specific embodiment of the present invention, the first filter includes:

[0023] a second exhaust pipe, provided on the top of the first filter, the first exhaust pipe being used to discharge the acidic gas filtered by the water out of the first containing chamber;

[0024] The exhaust valve is provided on the second exhaust pipe, and the exhaust valve can open or close the second exhaust pipe.

[0025] According to a specific embodiment of the present invention, it also includes:

[0026] a first valve, provided in the connecting pipe;

[0027] When the first valve is opened, the first accommodating chamber is communicated with the second accommodating chamber;

[0028] When the first valve is closed, the first accommodating chamber is isolated from the second accommodating chamber.

[0029] Using this technical solution, when the acidic gas is weak, it can be discharged into the air after being filtered through water alone. For example, when the acidic gas to be treated is weak, the first valve can be closed to isolate the first and second chambers, and the exhaust valve can be opened to connect the first chamber to the outside world through the second exhaust pipe. This prevents the gas filtered through the water in the first chamber from entering the second chamber through the connecting pipe and can only be discharged into the outside air through the second exhaust pipe. During this process, the acidic gas is not filtered through the alkaline solution, meaning that the alkaline solution in the second chamber is not lost, further reducing the cost of acidic gas treatment.

[0030] According to a specific embodiment of the present invention, the number of the first valves in the connecting pipeline is two, one of the two first valves is close to the first end, and the other first valve is close to the second end.

[0031] Since the acid mist absorption device is a large-scale device with a large volume, the distance between the first filter and the second filter is usually relatively far. In the embodiment of the present application, a first valve is provided at a position of the connecting pipe near the first filter, and a first valve is also provided at a position of the connecting pipe near the second filter. Thus, regardless of whether the operator is at the position of the first filter or the position of the second filter, the first valve can be quickly operated to open or close the connecting pipe.

[0032] According to a specific embodiment of the present invention, a spray portion is provided on the top of the first accommodating cavity, and the spray portion is used to spray the water into the first accommodating cavity.

[0033] With the above technical solution, after the acidic gas passes through the water filter in the first accommodating chamber and reaches above the water level, the acidic gas above the water level is further filtered by the spraying part, which can further reduce the acidity of the acidic gas.

[0034] According to a specific embodiment of the present invention, it also includes:

[0035] a water supply unit connected to the first filter and capable of communicating with the first accommodating chamber, the water supply unit being configured to provide the water to the first accommodating chamber;

[0036] An alkali solution supply part is connected to the second filter and can be communicated with the second accommodating cavity. The alkali solution supply part is used to provide the alkali solution to the second accommodating cavity.

[0037] According to a specific embodiment of the present invention, it also includes:

[0038] a water recovery unit connected to the first filter, the water recovery unit being used to recover the water;

[0039] The alkali solution recovery unit is connected to the second filter, and is used to recover the alkali solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The following is a schematic structural diagram of the acid mist absorption device according to an embodiment of the present utility model.

[0041] Description of Figure Numbers:

[0042] 100. Acid mist absorption device;

[0043] 110. First filter, 111. First accommodating chamber, 112. Second exhaust pipe, 113. Exhaust valve, 114. Spraying part;

[0044] 120. Second filter, 121. Second accommodating chamber, 122. First exhaust pipe;

[0045] 130. Connecting pipe, 131. First end, 132. Second end, 133. First valve;

[0046] 140. Water supply unit, 141. Main pipeline, 142. Backup pipeline, 143. Second valve, 144. Reducer;

[0047] 150. Alkali solution supply unit, 151. Main pipeline;

[0048] 160. Acid gas transport unit, 161. Inlet pipe, 162. Connecting end;

[0049] 170. Water Recovery Department;

[0050] 180. Alkali recovery department;

[0051] 200. Water;

[0052] 300. Lye. DETAILED DESCRIPTION

[0053] The following is an explanation of the implementation of the present invention by means of specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide an in-depth understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0054] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0055] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the utility model.

[0056] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0057] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0058] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0059] refer to Figure 1 The present invention provides an acid mist absorption device 100 for filtering acidic gas. Specifically, the acid mist absorption device 100 includes a first filter 110, a second filter 120, a connecting pipe 130, a water supply unit 140, an alkaline solution supply unit 150, and an acidic gas conveying unit 160.

[0060] The water supply unit 140 is used to provide water 200 to the first filter 110, and the alkali solution supply unit 150 is used to provide alkali solution 300 to the second filter 120. The acid gas delivery unit 160 is used to deliver the acid gas to be treated (such as volatiles of hydrochloric acid) to the acid mist absorption device 100.

[0061] The acidic gas is filtered by the water 200 in the first filter 110 and the alkaline solution 300 in the second filter 120 and then discharged from the second filter 120 to the outside air.

[0062] In the embodiment of the present application, water 200 is relatively low in cost and has a good absorption effect on acidic gases. The acidic gases are filtered through water, effectively reducing their acidity. However, this is not limiting. In other possible embodiments, water 200 can also be another medium that has an absorption effect on acidic gases, but its cost should be lower than that of alkaline solution.

[0063] That is, the acid mist absorption device 100 provided in the embodiment of the present application uses water 200 and alkaline solution 300 to perform a dual filtration of the acidic gas. The acidic gas is first filtered using water 200 to reduce the acidity of the acidic gas, and then the acidic gas filtered by water 200 is filtered using alkaline solution 300 for a second filtration. Because the acidic gas has already been reduced in acidity by water 200 before being filtered by alkaline solution 300, the amount of alkaline solution 300 used is greatly reduced, and the cost of water 200 is much lower than that of alkaline solution 300. Therefore, the acid mist absorption device 100 provided in the embodiment of the present application effectively reduces the cost of acidic gas treatment while ensuring the acidic gas treatment effect, and is economical.

[0064] The specific structure of each part of the acid mist absorption device 100 according to the embodiment of the present application will be described in detail below.

[0065] Continue to refer Figure 1 Exemplarily, the first filter 110 includes a first accommodating chamber 111, in which water 200 is stored. The second filter 120 includes a second accommodating chamber 121, in which alkali solution 300 is stored. The first filter 110 and the second filter 120 are connected by a connecting pipe 130. A first exhaust pipe 122 is provided at the top of the second filter 120, and the first exhaust pipe 122 is in fluid communication with the second accommodating chamber 121 to discharge the gas filtered by the alkali solution 300 into the outside air.

[0066] Exemplarily, the connecting pipe 130 includes a first end 131 and a second end 132. The first end 131 is connected to the first filter 110, and the second end 132 is connected to the second filter 120. The first accommodating chamber 111, the second accommodating chamber 121, and the connecting pipe 130 are in fluid communication, allowing the acidic gas filtered by the water 200 to enter the second accommodating chamber 121 and be filtered by the alkaline solution 300.

[0067] Illustratively, the acid gas transport unit 160 includes an inlet pipe 161 having a connection end 162 connected to the first filter 110. Furthermore, the acid gas transport unit 160 is in fluid communication with the first accommodating chamber 111. Specifically, the acid gas transport unit 160 transports acid gas to the first accommodating chamber 111 of the first filter 110 via the inlet pipe 161.

[0068] Furthermore, along the height direction Z, the connecting end 162 is located below the liquid level of the water 200 in the first accommodating chamber 111. Accordingly, along the height direction Z, the first end 131 of the connecting pipe 130 is located above the liquid level of the water 200 in the first accommodating chamber 111, and the second end 132 is located above the liquid level of the alkali solution 300 in the second accommodating chamber 121.

[0069] Because the density of acidic gas is lower than that of water 200 and the alkaline solution 300, it tends to flow upward relative to water 200 and the alkaline solution 300. Using this technical solution, since the connection end 162 of the acidic gas transport unit 160 is located below the surface of the water 200, upon entering the first containment chamber 111, the acidic gas will inevitably flow upward in the height direction Z, passing through the water 200 to reach above the surface of the water 200, thus completing the first stage of filtration. The acidic gas then flows into the second containment chamber 121 through the connecting pipe 130. Since the second end 132 of the connecting pipe 130 is located below the surface of the alkaline solution 300, upon entering the second containment chamber 121, the acidic gas will inevitably flow upward in the height direction Z, passing through the alkaline solution 300 to reach above the surface of the alkaline solution 300, thus completing the second stage of filtration. Finally, the acidic gas is discharged into the outside air through the first exhaust pipe 122.

[0070] Continue to refer Figure 1 In some possible embodiments, a spraying portion 114 is provided at the top of the first accommodating chamber 111. The spraying portion 114 is used to spray water 200 into the first accommodating chamber 111. Specifically, after the acidic gas is filtered through the water 200 in the first accommodating chamber 111 and reaches above the liquid level of the water 200, the acidic gas above the liquid level of the water 200 is further filtered by the spraying portion 114 to further reduce the acidity of the acidic gas, thereby further reducing the amount of alkaline solution 300 used. Exemplarily, the spraying portion 114 is a nozzle.

[0071] Continue to refer Figure 1 In some possible implementations, the first filter 110 further includes a second exhaust pipe 112 disposed at the top of the first filter 110. The second exhaust pipe 112 is provided with an exhaust valve 113, which can open or close the second exhaust pipe 112.

[0072] Correspondingly, a first valve 133 is provided on the connecting pipe 130. When the first valve 133 is opened, the first accommodating chamber 111 is fluidically connected to the second accommodating chamber 121. When the first valve 133 is closed, the first accommodating chamber 111 is fluidically isolated from the second accommodating chamber 121.

[0073] Specifically, when the acid mist absorption device 100 is in normal use, the exhaust valve 113 is closed. When the acidity of the acidic gas is relatively weak, it can be discharged into the air after being filtered only by the water 200. For example, when the acidic gas to be treated is relatively weak, the first valve 133 can be closed to isolate the first accommodating chamber 111 from the second accommodating chamber 121, and the exhaust valve 113 can be opened to connect the first accommodating chamber 111 to the outside world through the second exhaust pipe 112. As a result, the gas filtered by the water 200 in the first accommodating chamber 111 cannot enter the second accommodating chamber 121 through the connecting pipe 130 and can only be discharged into the outside air through the second exhaust pipe 112. In this process, the acidic gas is not filtered by the alkali solution 300, that is, the alkali solution 300 in the second accommodating chamber 121 will not be lost, further reducing the cost of treating the acidic gas.

[0074] Continue to refer Figure 1 For example, in an embodiment of the present application, the number of the first valves 133 of the connecting pipe 130 is two, one of the two first valves 133 is close to the first end 131 (i.e., close to the first filter 110), and the other first valve 133 is close to the second end 132 (i.e., close to the second filter 120). Since the acid mist absorption device 100 is a large-scale equipment with a large volume, the distance between the first filter 110 and the second filter 120 is usually relatively far. In an embodiment of the present application, a first valve 133 is provided at a position of the connecting pipe 130 close to the first filter 110, and a first valve 133 is also provided at a position of the connecting pipe 130 close to the second filter 120. Thus, no matter whether the staff is at the position of the first filter 110 or the position of the second filter 120, the first valve 133 can be quickly operated to open or close the connecting pipe 130.

[0075] Continue to refer Figure 1 For example, in the embodiment of the present application, the water supply unit 140 is connected to the first filter 110 through the main pipe 141, and the water supply unit 140 can be in fluid communication with the first accommodating chamber 111 to provide water 200 to the first accommodating chamber 111. For example, a second valve 143 is provided on the main pipe 141, and the second valve 143 can open or close the main pipe 141. When it is necessary to supply water 200 to the first accommodating chamber 111, the second valve 143 can be opened to allow the water supply unit 140 to supply water 200 to the first accommodating chamber 111. When it is not necessary to supply water 200 to the first accommodating chamber 111, the second valve 143 can be closed to isolate the first accommodating chamber 111 from the water supply unit 140.

[0076] For example, in some possible embodiments, the water supply unit 140 further includes a backup pipe 142, which is connected in parallel with the main pipe 141 and is also provided with a second valve 143. Thus, when the main pipe 141 is in normal use, the second valve 143 of the main pipe 141 is opened, while the second valve 143 of the backup pipe 142 is closed. The water supply unit 140 is in fluid communication with the first accommodating chamber 111 via the main pipe 141, and water 200 is provided to the first accommodating chamber 111. When the main pipe 141 is damaged or under repair, the second valve 143 of the main pipe 141 can be closed, while the second valve 143 of the backup pipe 142 is opened, thereby maintaining fluid communication between the water supply unit 140 and the first accommodating chamber 111 via the backup pipe 142.

[0077] For example, in this embodiment of the present application, a diameter reducer 144 is further provided on the main pipe 141 and the backup pipe 142. The diameter reducer 144 enables pipes of different diameters to be connected together. Specifically, in this embodiment of the present application, the diameter of the water supply unit 140 is different from that of the main pipe 141 and the backup pipe 142. The diameter reducer 144 enables the main pipe 141 and the backup pipe 142 to be connected to the water supply unit 140.

[0078] Continue to refer Figure 1 For example, in an embodiment of the present application, the alkali solution providing part 150 is connected to the second filter 120 through the main pipe 151, and the alkali solution providing part 150 is communicated with the second accommodating chamber 121, and the alkali solution providing part 150 is used to provide alkali solution 300 to the second accommodating chamber 121.

[0079] In other possible embodiments, the alkali solution providing unit 150 may also be connected to the second filter 120 via a backup pipeline (not shown), and the backup pipeline is connected in parallel with the main pipeline 151. Accordingly, a second valve (not shown) is provided on both the main pipeline 151 and the backup pipeline. Thus, when the main pipeline 151 is in normal use, the second valve of the main pipeline 151 is opened, the second valve of the backup pipeline is closed, and the alkali solution providing unit 150 is in fluid communication with the second accommodating chamber 121 via the main pipeline 151, and provides alkali solution 300 to the second accommodating chamber 121. When the main pipeline 151 is damaged or overhauled, the second valve of the main pipeline 151 can be closed, and the second valve of the backup pipeline can be opened so that the alkali solution providing unit 150 is in fluid communication with the second accommodating chamber 121 via the backup pipeline.

[0080] For example, in some possible embodiments, when the diameter of the alkali solution supply part 150 is different from the diameter of the main pipeline 151 or the backup pipeline, the alkali solution supply part 150 can also be connected to the main pipeline 151 and the backup pipeline through a reducer 144 (not shown in the figure).

[0081] Continue to refer Figure 1In some possible implementations, the acid mist absorption device 100 further includes a water recovery unit 170 and an alkali solution recovery unit 180 .

[0082] Specifically, the water recovery unit 170 is connected to the first filter 110 , and the alkali solution recovery unit 180 is connected to the second filter 120 .

[0083] For example, as the water 200 in the first accommodating chamber 111 continuously filters the acidic gas, the water 200 will tend to be saturated (i.e., the water 200 can no longer filter the acidic gas). At this time, the saturated water 200 needs to be recovered to the water recovery unit 170 for centralized treatment of the saturated water 200.

[0084] For example, as the alkaline solution 300 in the second accommodating chamber 121 continuously filters the acidic gas, the alkaline solution 300 will tend to be saturated (i.e., the alkaline solution 300 can no longer filter the acidic gas). At this time, the saturated alkaline solution 300 needs to be recovered to the alkaline solution recovery part 180 for centralized treatment of the saturated alkaline solution 300.

[0085] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above description is provided to further illustrate the present invention in conjunction with specific embodiments, and that the present invention should not be construed as being limited to these descriptions. Those skilled in the art may make various changes in form and detail, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An acid mist absorption device for filtering acidic gas, characterized in that: include: A first filter is configured to receive the acid gas, wherein the first filter comprises: The first accommodating chamber stores water, and the water is used to filter the acid gas; a second filter, configured to receive the acidic gas filtered by the water, the second filter comprising: The second accommodating chamber can be communicated with the first accommodating chamber. The second accommodating chamber stores alkaline solution, and the alkaline solution is used to filter the acidic gas after being filtered by the water.

2. The acid mist absorption device according to claim 1, characterized in that Also includes: Connecting pipes, including: a first end connected to the first filter, wherein the first end is located above the liquid level of the water in the first accommodating chamber along a height direction; The second end is connected to the second filter, and along the height direction, the second end is located below the liquid level of the alkali solution in the second accommodating cavity.

3. The acid mist absorption device according to claim 2, characterized in that: Also includes: Sour Gas Transportation Department; an air inlet pipe connected to the acid gas delivery portion, the air inlet pipe comprising a connecting end connected to the first filter, and the air inlet pipe capable of communicating with the first accommodating chamber; Along the height direction, the connection end is located below the liquid surface of the water, and the air inlet pipe is used to transport the acidic gas to the first accommodating chamber.

4. The acid mist absorption device according to claim 2, characterized in that: The second filter includes: The first exhaust pipe is provided on the top of the second filter, and is used to discharge the acidic gas filtered by the alkali solution out of the second accommodating cavity.

5. The acid mist absorption device according to claim 4, characterized in that: The first filter comprises: a second exhaust pipe, provided on the top of the first filter, the first exhaust pipe being used to discharge the acidic gas filtered by the water out of the first containing chamber; The exhaust valve is provided on the second exhaust pipe, and the exhaust valve can open or close the second exhaust pipe.

6. The acid mist absorption device according to claim 5, characterized in that: Also includes: a first valve, provided in the connecting pipe; When the first valve is opened, the first accommodating chamber is communicated with the second accommodating chamber; When the first valve is closed, the first accommodating chamber is isolated from the second accommodating chamber.

7. The acid mist absorption device according to claim 6, characterized in that: The number of the first valves in the connecting pipeline is two, one of the two first valves is close to the first end, and the other first valve is close to the second end.

8. The acid mist absorption device according to claim 1, characterized in that: A spray portion is provided on the top of the first accommodating cavity, and the spray portion is used to spray the water into the first accommodating cavity.

9. The acid mist absorption device according to claim 1, characterized in that: Also includes: a water supply unit connected to the first filter and capable of communicating with the first accommodating chamber, the water supply unit being configured to provide the water to the first accommodating chamber; An alkali solution supply part is connected to the second filter and can be communicated with the second accommodating cavity. The alkali solution supply part is used to provide the alkali solution to the second accommodating cavity.

10. The acid mist absorption device according to claim 1, characterized in that: Also includes: a water recovery unit connected to the first filter, the water recovery unit being used to recover the water; The alkali solution recovery unit is connected to the second filter, and is used to recover the alkali solution.

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