Chemical tail gas alkali washing device

Abstract

The utility model provides a chemical tail gas alkali washing device. The chemical tail gas alkali washing device comprises an alkali washing tower, a water tank, an alkali liquor tank and a cleaning tank, a plurality of filler layers are arranged on the middle lower section in the alkaline washing tower from top to bottom, and ultrasonic transducers are arranged on the upper surface and the lower surface of each filler layer; the water tank is communicated with the upper section of the alkaline tower through a water pipe; a heating sleeve is arranged outside the alkali liquor box, an alkali liquor pipe is communicated with the alkali liquor box, one end, far away from the alkali liquor box, of the alkali liquor pipe penetrates through and extends into the alkali washing tower and is positioned above the filler layer at the top layer, and a plurality of first high-pressure nozzles are uniformly arranged on a pipe body, positioned in the alkali washing tower, of the alkali liquor pipe; and the cleaning box is communicated with a pipe body of the alkali liquor pipe outside the alkali washing tower through a cleaning pipe. According to the chemical tail gas alkali washing tower, the packing layer is prevented from being blocked as much as possible, so that the contact area of the packing layer and the chemical tail gas on the packing layer is ensured, acid gas in the chemical tail gas can be effectively removed in the alkali washing process of the chemical tail gas through the alkali washing tower, and the environment pollution caused by the fact that the acid gas is exhausted into the atmosphere is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of chemical tail gas treatment, and particularly to a chemical tail gas alkali washing device. Background Technique

[0002] Chemical tail gas, namely chemical waste gas, refers to the toxic and harmful gases discharged from chemical plants during chemical production. Chemical waste gas often contains many types of pollutants, with complex physical and chemical properties and different toxicities, seriously polluting the environment and affecting human health. The components of chemical waste gas generated by different chemical production industries vary greatly. For example: during the production of chloroethylene glycol monopropyl ether from ethylene glycol monopropyl ether and thionyl chloride, the tail gas generated contains a certain amount of thionyl chloride, and thionyl chloride has a strong pungent odor. Therefore, in order to avoid the harm caused by the volatilization of thionyl chloride tail gas to the environment, it is necessary to alkali wash the tail gas generated during the production of chloroethylene glycol monopropyl ether through a chemical tail gas alkali washing device.

[0003] For the existing chemical tail gas alkali washing device, usually the tail gas (containing thionyl chloride) generated during the production of chloroethylene glycol monopropyl ether is introduced into an alkali absorption tower, and an alkali solution (such as sodium hydroxide solution) is used as an absorbent to absorb thionyl chloride in the above-mentioned tail gas and generate sodium sulfite and sodium chloride. After the alkali absorption tower has been used for a long time and the alkali solution is close to saturation, sodium sulfite and sodium chloride will crystallize and precipitate on the packing layer in the absorption tower and deposit in places where the flow rate slows down, and over time, the deposition of sodium sulfite and sodium chloride shows an accelerating trend, resulting in the blockage of the packing layer, affecting the processes of gas supply and liquid flow in the packing layer, thereby affecting the absorption effect of the alkali solution on the tail gas containing thionyl chloride, and causing environmental pollution after thionyl chloride is discharged. Utility Model Content

[0004] The present application provides a chemical tail gas alkali washing device to solve the technical problems recorded in the above background technique.

[0005] To solve the above technical problems, the present application adopts the following technical solutions to solve:

[0006] The present application provides a chemical tail gas alkali washing device, including: an alkali washing tower and a water tank, an alkali solution tank, and a cleaning tank arranged outside it;

[0007] A plurality of packing layers are arranged from top to bottom in the middle and lower sections inside the alkali washing tower, and ultrasonic transducers are arranged on the upper and lower surfaces of each packing layer;

[0008] The water tank is communicated with the upper section of the alkali washing tower through a water pipe;

[0009] A heating jacket is provided outside the lye tank, and a lye pipe is connected thereto. One end of the lye pipe away from the lye tank penetrates and extends into the caustic scrubber and is located above the packing layer at the top layer. A plurality of first high-pressure spray nozzles are uniformly arranged on the pipe body of the lye pipe located inside the caustic scrubber.

[0010] The cleaning tank is communicated with the pipe body of the lye pipe located outside the caustic scrubber through a cleaning pipe.

[0011] Optionally, each packing layer includes a porous contact box and a plurality of floating balls.

[0012] The outer peripheral wall of the contact box is arranged on the inner peripheral wall of the caustic scrubber, and a plurality of floating balls are arranged inside the contact box. The diameter of the floating ball is larger than the aperture of the contact box.

[0013] Optionally, the contact box is made of metal material, and a plurality of floating balls are made of plastic material.

[0014] Optionally, one end of the water pipe away from the water tank extends into the caustic scrubber. A plurality of second high-pressure spray nozzles are uniformly arranged on the pipe body of the water pipe located inside the caustic scrubber, and a first high-pressure pump is arranged on the pipe body of the water pipe located outside the caustic scrubber.

[0015] Optionally, a first stop valve is arranged on the cleaning pipe. A second high-pressure pump is arranged on the pipe body of the lye pipe between the caustic scrubber and the cleaning pipe, and a second stop valve is arranged on the pipe body of the lye pipe between the cleaning pipe and the lye tank.

[0016] Optionally, a lye collection pipe is connected to the bottom of the caustic scrubber. One end of the lye collection pipe away from the caustic scrubber is connected to a lye collection tank, and a third stop valve is arranged on the pipe body of the lye collection pipe close to the caustic scrubber.

[0017] Optionally, an air inlet pipe is connected to the bottom of the caustic scrubber. One end of the air inlet pipe away from the caustic scrubber is used to connect to a chemical tail gas storage tank to be caustic scrubbed, and a regulating valve is arranged on the air inlet pipe.

[0018] An air outlet pipe is connected to the top of the caustic scrubber, and a fourth stop valve is arranged on the air outlet pipe.

[0019] Optionally, an induced draft fan is arranged at one end of the air outlet pipe away from the caustic scrubber.

[0020] The chemical tail gas caustic washing device provided by the present application heats the caustic solution in the caustic solution tank through a heating jacket, so that the temperature of the caustic washing tower increases after the caustic solution enters the caustic washing tower, avoiding the crystallization salt formed by the reaction of the acidic gas in the chemical tail gas generated during the chemical production process with the caustic solution from precipitating at low temperature and adhering to the packing layer to cause blockage of the packing layer, thereby reducing the risk of blockage of the packing layer caused by the salt generated during the chemical tail gas caustic washing process. Moreover, multiple first high-pressure nozzles not only increase the impact force of the caustic solution on the packing layer, and the relatively large impact force can wash away the crystallization salt deposited on the packing layer from the packing layer, but also increase the contact area between the caustic solution and the packing layer, making the caustic solution sprayed on the packing layer as evenly as possible to avoid local blockage of the packing layer. The ultrasonic transducers arranged on the upper and lower surfaces of the packing layer can generate ultrasonic waves, which not only make the caustic solution fully contact with the chemical tail gas, but also reduce the adhesion of the crystallization salt on the packing layer, making the crystallization salt adhering to the packing layer detach, further reducing the risk of blockage of the packing layer caused by the crystallization salt. In addition, the cleaning solution provided by the cleaning tank is sprayed into the caustic washing tower through the caustic solution pipe and multiple first high-pressure nozzles to fully contact with the packing layer in the tower and clean the packing layer. Finally, the water provided by the water tank is sprayed into the caustic washing tower from top to bottom through the upper section of the caustic washing tower to wash the packing layer in the caustic washing tower again, improving the cleaning efficiency of the packing layer, as much as possible avoiding blockage of the packing layer, thereby ensuring the contact area between the packing layer and the chemical tail gas on the packing layer, enabling the effective removal of the acidic gas in the chemical tail gas through the caustic washing tower and avoiding the pollution of the environment caused by the discharge of the acidic gas into the atmosphere. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of a chemical tail gas caustic washing device provided by an embodiment of the present application;

[0023] Figure 2 It is a schematic structural diagram of a chemical tail gas caustic washing device provided by another embodiment of the present application;

[0024] Figure 3 It is a schematic internal structure diagram of a caustic washing tower provided by an embodiment of the present application;

[0025] Figure 4 It is a schematic structural diagram of a support box provided by an embodiment of the present application.

[0026] In the figure: 100, caustic scrubber; 101, packing layer; 1011, ultrasonic transducer; 1012, contact box; 1013, floating ball; 102, caustic solution collecting pipe; 1021, caustic solution collecting box; 1022, third stop valve; 103, inlet gas pipe; 1031, regulating valve; 104, outlet gas pipe; 1041, fourth stop valve; 1042, induced draft fan; 200, water tank; 201, water pipe; 2011, second high-pressure spray head; 2012, first high-pressure pump; 300, caustic solution tank; 301, heating jacket; 302, caustic solution pipe; 3021, first high-pressure spray head; 3022, second high-pressure pump; 3023, second stop valve; 400, cleaning box; 401, cleaning pipe; 4011, first stop valve; 500, chemical tail gas storage tank. Detailed implementation mode

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts also belong to the scope of protection of the present application.

[0028] Refer to Figures 1 to 4 , the present application provides a chemical tail gas caustic scrubbing device, including: a caustic scrubber 100 and a water tank 200, a caustic solution tank 300 and a cleaning box 400 arranged outside it; wherein, the caustic scrubber 100 is used for caustic scrubbing chemical tail gas to remove the acidic gas contained therein.

[0029] Multiple packing layers 101 are arranged from top to bottom in the middle and lower sections inside the caustic scrubber 100, and ultrasonic transducers 1011 are arranged on the upper and lower surfaces of each packing layer 101; wherein, the packing layer 101 is used to increase the contact area between the chemical tail gas and the caustic solution, so that the caustic solution can fully contact the chemical tail gas and absorb the acidic gas in the chemical tail gas.

[0030] The water tank 200 is communicated with the upper section of the caustic scrubber 100 through a water pipe 201; wherein, the water tank 200 is filled with water, and is used to provide the water required for the caustic scrubbing process in the caustic scrubber 100 and the water required for cleaning the packing layer 101.

[0031] A heating jacket 301 is provided outside the lye tank 300, and a lye pipe 302 is connected thereto. One end of the lye pipe 302 far from the lye tank 300 penetrates and extends into the caustic scrubber 100 and is located above the top packing layer 101. A plurality of first high-pressure nozzles 3021 are evenly arranged on the pipe body of the lye pipe 302 inside the caustic scrubber 100. Among them, the lye tank 300 is filled with lye (which can be sodium hydroxide solution). The heating temperature of the lye in the lye tank 300 can be set through the heating jacket 301 (the specifications and models of the heating jacket 301 can be selected according to actual needs, and the present application does not further limit it here), so that the lye in the lye tank 300 has a certain temperature. The lye with a certain temperature enters the caustic scrubber 100, causing the temperature in the caustic scrubber 100 to rise. During the process of the caustic scrubber 100 scrubbing chemical tail gas, the salts generated by the reaction of the acidic gas in the chemical tail gas with the lye will not precipitate and adhere to the packing layer, thereby reducing the risk of blockage of the packing layer 101. In addition, the plurality of first high-pressure nozzles 3021 not only increase the impact force of the lye on the packing layer 101, and the greater impact force can wash away the crystal salts deposited on the packing layer 101 from the packing layer 101. The plurality of first high-pressure nozzles 3021 also increase the contact area between the lye and the packing layer 101, so that the lye is sprayed as evenly as possible on the packing layer 101, avoiding local blockage of the packing layer 101.

[0032] The cleaning tank 400 is communicated with the pipe body of the lye pipe 302 outside the caustic scrubber 100 through a cleaning pipe 401.

[0033] The chemical exhaust alkali washing device provided in the present application, in order to prevent the packing layer 101 from being blocked, in the process of alkali washing the chemical exhaust gas through the alkali washing tower 100, the alkali liquid in the alkali liquid tank 300 is first heated by the heating jacket 301, so that the alkali liquid is sprayed from top to bottom onto the packing layer 101 through the alkali washing pipe 302 and the multiple first high-pressure nozzles 3021 located in the alkali washing tower 100, thereby avoiding the acidic gas in the chemical exhaust gas generated in the chemical production process reacting with the alkali liquid to generate a salt solution that precipitates into crystalline salt at low temperature and adheres to the packing layer 101 to cause blockage of the packing layer 101, thereby reducing the risk of the salt generated in the chemical exhaust gas alkali washing process causing blockage of the packing layer 101. At the same time, ultrasonic transducers 1011 arranged on the upper and lower surfaces of the packing layer 101 can generate ultrasonic waves, which not only allows the alkali liquid to fully contact the chemical exhaust gas, but also reduces the adhesion of the crystalline salt to the packing layer 101, so that the crystalline salt attached to the packing layer 101 is detached, further reducing the risk of the crystalline salt causing blockage of the packing layer 101. After the above-mentioned alkali washing process is completed, the cleaning liquid provided by the washing tank 400 is sprayed into the alkali washing tower 100 through the alkali liquid pipe 302 and multiple first high-pressure nozzles 3021 to fully contact the packing layer 101 therein, and the packing layer 101 is cleaned. Then, the water provided by the water tank 200 is sprayed into the alkali washing tower 100 from top to bottom through the upper section of the alkali washing tower 100 to wash the packing layer 101 in the alkali washing tower 101 again, thereby improving the cleaning efficiency of the packing layer 101 and avoiding clogging of the packing layer 101 as much as possible, thereby ensuring the contact area between the packing layer 101 and the chemical exhaust gas on the packing layer 101, so that the acid gas therein can be effectively removed during the alkali washing of the chemical exhaust gas by the alkali washing tower 100, thereby avoiding the acid gas from being discharged into the atmosphere and polluting the environment.

[0034] In some embodiments, reference Figure 4 Each packing layer 101 in the present application includes a porous contact box 1012 and a plurality of floating balls 1013; specifically, the outer peripheral wall of the contact box 1012 is set on the inner peripheral wall of the alkali washing tower 100, and the plurality of floating balls 1013 are all set in the contact box 1012, and the diameter of the floating ball 1013 is larger than the aperture of the contact box 1012, thereby ensuring that the floating ball 1013 is always in the contact box 1012.

[0035] In the above embodiment, the multiple holes on the contact box 1012 can disperse the alkali solution and chemical exhaust gas passing through it, thereby increasing the contact area between the alkali solution and the chemical exhaust gas, and the multiple floating balls 1013 can float back and forth in the contact box 1012 under the impact of the alkali solution or the chemical exhaust gas, further dispersing the alkali solution and chemical exhaust gas entering the contact box 1012, thereby improving the alkali washing efficiency of the alkali solution on the chemical exhaust gas and improving the removal efficiency of the pickling gas in the chemical exhaust gas.

[0036] In some embodiments, the contact box 1012 in the present application is made of metal, and the plurality of floating balls 1013 are all made of plastic. Specifically, the contact box 1012 is made of stainless steel. The stainless steel contact box endows the contact box 1012 with advantages such as corrosion resistance and high temperature resistance, thereby increasing the service life of the contact box in the caustic scrubber 100. The plastic floating balls 1013 can be made of materials such as polypropylene that are light in weight, corrosion-resistant, and high-temperature resistant. This not only enables the floating balls 1013 to float easily in the caustic scrubber 100 when subjected to the impact of caustic liquid or chemical tail gas, but also increases the service life of the floating balls 1013.

[0037] In some embodiments, referring to Figure 3 , one end of the water pipe in the present application that is far from the water tank 200 extends into the caustic scrubber 100. A plurality of second high-pressure nozzles 2011 are uniformly arranged on the pipe body of the water pipe 201 located in the caustic scrubber 100, and a first high-pressure pump 2012 is arranged on the pipe body of the water pipe 201 located outside the caustic scrubber 100.

[0038] In the above embodiments, the first high-pressure pump 2012 sprays the water in the water tank 200 into the caustic scrubber 100 through the water pipe 201 and the plurality of second high-pressure nozzles 2011 for water washing during the caustic washing process of the chemical tail gas. The plurality of second high-pressure nozzles 2011 uniformly spray the water into the caustic scrubber 100, enabling the water to come into full contact with the chemical tail gas, thereby improving the water washing efficiency of the chemical tail gas by water.

[0039] In some embodiments, referring to Figure 1 、 Figure 2 and Figure 3 , a first stop valve 4011 is arranged on the cleaning pipe 401 in the present application. A second high-pressure pump 3022 is arranged on the pipe body of the caustic liquid pipe 302 between the caustic scrubber 100 and the cleaning pipe 401, and a second stop valve 3023 is arranged on the pipe body of the caustic liquid pipe 302 between the cleaning pipe 401 and the caustic liquid tank 300. During the process of the caustic scrubber 100 performing caustic washing on the chemical tail gas, the first stop valve 4011 is closed, and the second stop valve 3023 and the second high-pressure pump 3022 are opened, so that the caustic liquid in the caustic liquid tank 300 is sprayed into the caustic scrubber 100 through the caustic liquid pipe 302 and the plurality of first high-pressure nozzles 3021. After the caustic washing process is over, during the process of cleaning the packing layer 101, the second stop valve 3023 is closed, and the first stop valve 4011 and the second high-pressure pump 3022 are opened. The cleaning liquid in the cleaning tank 400 is sprayed onto the packing layer 101 through the cleaning pipe 401, the caustic liquid pipe 302, and the plurality of first high-pressure nozzles 3021 to clean the dirt attached to the packing layer 101, thereby reducing the clogging efficiency of the packing layer 101.

[0040] In some embodiments, referring to Figure 1, a lye collecting pipe 102 is connected to the bottom of the caustic scrubbing tower 100 in this application. One end of the lye collecting pipe 102 far from the caustic scrubbing tower 100 is connected to a lye collecting tank 1021, and a third stop valve 1022 is arranged on the pipe body of the lye collecting pipe 102 close to the caustic scrubbing tower 100. Among them, during the caustic scrubbing process, to ensure the caustic scrubbing efficiency, it is necessary to timely discharge the caustic scrubbing waste liquid generated during the caustic scrubbing process outside the caustic scrubbing tower 100. Specifically, open the third stop valve 1022, and the caustic scrubbing waste liquid in the caustic scrubbing tower 100 flows into the lye collecting tank 1021 through the lye collecting pipe 102. The lye collecting tank 1021 is used to collect the caustic scrubbing waste liquid generated during the caustic scrubbing process, thereby ensuring the effective progress of the caustic scrubbing process.

[0041] In some embodiments, referring to Figure 2 , an inlet gas pipe 103 is connected to the bottom of the caustic scrubbing tower 100 in this application. One end of the inlet gas pipe 103 far from the caustic scrubbing tower 100 is used to connect to a chemical industrial waste gas storage tank 500 to be caustically scrubbed, and a regulating valve 1031 is arranged on the inlet gas pipe; among them, the chemical industrial waste gas enters the bottom of the caustic scrubbing tower 100 from the chemical industrial waste gas storage tank 500 and the inlet gas pipe 103 and diffuses towards the top of the caustic scrubbing tower 100. The flow rate of the chemical industrial waste gas entering the caustic scrubbing tower 100 can be adjusted in real time through the regulating valve 1031, which is convenient for mastering the actual caustic scrubbing situation of the chemical industrial waste gas.

[0042] In addition, an outlet gas pipe 104 is connected to the top of the caustic scrubbing tower 100, and a fourth stop valve 1041 is arranged on the outlet gas pipe 104. Among them, open the fourth stop valve 1041, and the caustically scrubbed chemical industrial waste gas (with the acidic gas contained therein removed) is discharged through the outlet gas pipe 104. At the initial stage of the caustic scrubbing process, the fourth stop valve 1041 is closed, aiming to make the chemical industrial waste gas fully contact with the lye and then be discharged from the caustic scrubbing tower 100, improving the caustic scrubbing efficiency of the chemical industrial waste gas.

[0043] In some embodiments, referring to Figure 2 , a draft fan 1042 is arranged at one end of the outlet gas pipe 104 far from the caustic scrubbing tower 100 in this application. Among them, the draft fan 1042 can extract the chemical industrial waste gas in the caustic scrubbing tower 100 outwards, improving the diffusion rate of the chemical industrial waste gas in the caustic scrubbing tower 100, thereby improving the caustic scrubbing efficiency of the caustic scrubbing tower 100 for the chemical industrial waste gas.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, rather than to limit them; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and 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 this application.

Claims

1. A chemical tail gas caustic washing device, characterized in that, Including: An alkali washing tower (100) and a water tank (200), an alkali solution tank (300) and a cleaning tank (400) arranged outside it; Multiple packing layers (101) are arranged from top to bottom in the middle and lower sections inside the alkali washing tower (100), and ultrasonic transducers (1011) are arranged on the upper and lower surfaces of each packing layer (101); The water tank (200) is communicated with the upper section of the alkali washing tower (100) through a water pipe (201); A heating jacket (301) is arranged outside the alkali solution tank (300), and an alkali solution pipe (302) is communicated with it. One end of the alkali solution pipe (302) far from the alkali solution tank (300) penetrates and extends into the alkali washing tower (100) and is located above the top packing layer (101). A plurality of first high-pressure nozzles (3021) are evenly arranged on the pipe body of the alkali solution pipe (302) inside the alkali washing tower (100); The cleaning tank (400) is communicated with the pipe body of the alkali solution pipe (302) outside the alkali washing tower (100) through a cleaning pipe (401).

2. The chemical tail gas caustic washing device according to claim 1, wherein, Each packing layer (101) includes a porous contact box (1012) and a plurality of floating balls (1013); The outer peripheral wall of the contact box (1012) is arranged on the inner peripheral wall of the alkali washing tower (100), and a plurality of floating balls (1013) are arranged inside the contact box (1012). The diameter of the floating balls (1013) is larger than the aperture of the contact box (1012).

3. The chemical tail gas caustic washing device according to claim 2, characterized in that, The contact box (1012) is made of metal, and a plurality of floating balls (1013) are made of plastic.

4. The chemical tail gas caustic washing device according to claim 1, characterized in that, One end of the water pipe (201) far from the water tank (200) extends into the alkali washing tower (100). A plurality of second high-pressure nozzles (2011) are evenly arranged on the pipe body of the water pipe (201) inside the alkali washing tower (100), and a first high-pressure pump (2012) is arranged on the pipe body of the water pipe (201) outside the alkali washing tower (100).

5. The caustic scrubbing device for chemical tail gas according to claim 1, wherein, A first stop valve (4011) is arranged on the cleaning pipe (401), a second high-pressure pump (3022) is arranged on the pipe body of the alkali solution pipe (302) between the alkali washing tower (100) and the cleaning pipe (401), and a second stop valve (3023) is arranged on the pipe body of the alkali solution pipe (302) between the cleaning pipe (401) and the alkali solution tank (300).

6. The chemical tail gas caustic washing device according to any one of claims 1 to 5, characterized in that, The bottom of the alkali washing tower (100) is communicated with an alkali solution collecting pipe (102). One end of the alkali solution collecting pipe (102) far from the alkali washing tower (100) is communicated with an alkali solution collecting box (1021), and a third stop valve (1022) is arranged on the pipe body of the alkali solution collecting pipe (102) close to the alkali washing tower (100).

7. The caustic scrubbing device for chemical tail gas according to any one of claims 1 to 5, characterized in that The bottom of the alkali washing tower (100) is communicated with an air inlet pipe (103). One end of the air inlet pipe (103) far from the alkali washing tower (100) is used to communicate with a chemical industrial waste gas storage tank (500) to be alkali-washed, and a regulating valve (1031) is arranged on the air inlet pipe (103); An air outlet pipe (104) is connected to the top of the caustic scrubber tower (100), and a fourth stop valve (1041) is arranged on the air outlet pipe (104).

8. The caustic scrubbing device for chemical tail gas according to claim 7, characterized in that, An induced draft fan (1042) is arranged at one end of the air outlet pipe (104) away from the caustic scrubber tower (100).

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