A treatment system and method for sulfur-containing waste gas

Abstract

The present invention discloses a treatment system and method for sulfur-containing waste gas. The system includes a desulfurization tower, an alkali washing tower, and a water washing tower that are connected in sequence. The provided desulfurization tower can effectively remove the sulfur-containing components in the waste gas. Then, through the treatment of the alkali washing tower, the acidic gas escaping from the desulfurization tower is absorbed and removed. Finally, through the treatment of the water washing tower, the alkali mist coming out of the alkali washing tower is absorbed and removed, ultimately achieving the effective purification and up-to-standard discharge of the waste gas. Compared with the RTO incinerator, the treatment system for sulfur-containing waste gas of the present invention has the advantages of simple structure, small investment, low operating cost, good purification effect, high safety factor, easy engineering promotion, etc., with high use value and good application prospect. At the same time, the method for treating sulfur-containing waste gas using this treatment system has the advantages of simple operation, low cost, high treatment efficiency, good treatment effect, and no secondary air pollution, and is suitable for widely treating sulfur-containing waste gas from different sources.

Description

Technical Field

[0001] The present invention belongs to the field of waste gas treatment and relates to a treatment system and method for sulfur-containing waste gas. Background Art

[0002] Sulfur-containing compounds such as hydrogen sulfide, methanethiol, and dimethyl sulfide are widely used in chemical fields such as medicine and pesticides. However, these sulfur-containing compounds have a low odor threshold and a strong foul smell. Therefore, foul-smelling sulfur-containing waste gas often occurs during the production, application, and storage of these sulfur-containing compounds. Common desulfurization processes such as limestone-gypsum method, ammonia-ammonium sulfate method, and double-alkali method mainly target inorganic sulfur such as sulfur dioxide. Organic sulfur tail gas with a foul smell is generally treated by the RTO incineration method. However, the incineration method has a large investment, high operating cost, is not easy to promote, and the sulfur dioxide-containing waste gas generated by incineration also needs to be further desulfurized before it can be discharged. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a treatment system for sulfur-containing waste gas with a simple structure, small investment, low operating cost, good purification effect, high safety factor, and easy to be popularized in engineering. The present invention also provides a treatment method for sulfur-containing waste gas with simple operation, low cost, high treatment efficiency, good treatment effect, and no secondary air pollution.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A treatment system for sulfur-containing waste gas includes a desulfurization tower, an alkali washing tower, and a water washing tower that are connected in sequence and are used to remove sulfur-containing components in the sulfur-containing waste gas.

[0006] As a further improvement of the above technical solution: the number of the desulfurization towers is at least one; when the number of the desulfurization towers exceeds one, the desulfurization towers are connected in series.

[0007] As a further improvement of the above technical solution: a first cloth distributor for spraying chlorine dioxide solution is arranged above the desulfurization tower; the first cloth distributor is connected to the bottom of the desulfurization tower through a pipeline; a first circulation pump is arranged on the pipeline between the desulfurization tower and the first cloth distributor; a first valve is arranged between the first cloth distributor and the first circulation pump.

[0008] As a further improvement of the above technical solution: a chlorine dioxide storage device is also connected to the first cloth distributor; a water injector is arranged on the pipeline between the first cloth distributor and the chlorine dioxide storage device; a one-way valve is arranged on the pipeline from the chlorine dioxide storage device to the water injector; the water injector is connected to the first circulation pump through a pipeline; a second valve is arranged between the water injector and the first circulation pump; the chlorine dioxide storage device is a chlorine dioxide storage tank or a chlorine dioxide generator.

[0009] As a further improvement of the above technical solution: a pickling tower for absorbing the alkaline components in the sulfur-containing waste gas is also connected to the bottom of the desulfurization tower; a second cloth distributor for spraying an acidic solution is arranged above the pickling tower; the second cloth distributor is connected to the bottom of the pickling tower through a pipeline; a second circulation pump is arranged on the pipeline between the second cloth distributor and the pickling tower; a gas supply device for conveying the sulfur-containing waste gas is also connected to the bottom of the pickling tower; the gas supply device is a suction fan.

[0010] As a further improvement of the above technical solution: a third cloth distributor for spraying an alkaline solution is arranged above the caustic washing tower; the third cloth distributor is connected to the bottom of the caustic washing tower through a pipeline; a third circulation pump is arranged on the pipeline between the third cloth distributor and the caustic washing tower.

[0011] As a further improvement of the above technical solution: a fourth cloth distributor for spraying water is arranged above the water washing tower; the fourth cloth distributor is connected to the bottom of the water washing tower through a pipeline; a fourth circulation pump is arranged on the pipeline between the fourth cloth distributor and the water washing tower.

[0012] As a general technical concept, the present invention also provides a method for treating sulfur-containing waste gas, and the above treatment system is used to treat the sulfur-containing waste gas.

[0013] As a further improvement of the above technical solution: it includes the following steps:

[0014] S1. Acidic solution, chlorine dioxide solution, alkaline solution, and water are sequentially introduced into the pickling tower, desulfurization tower, caustic washing tower, and water washing tower, and the corresponding circulation pumps of each tower are started;

[0015] S2. The sulfur-containing waste gas is sequentially passed through the pickling tower, desulfurization tower, caustic washing tower, and water washing tower in step S1 to complete the treatment of the sulfur-containing waste gas.

[0016] As a further improvement of the above technical solution: in step S1, the mass concentration of the pickling solution in the pickling tower is controlled to be 5% - 30%; the acidic solution is sulfuric acid solution and / or hydrochloric acid solution; the mass concentration of the chlorine dioxide solution in the desulfurization tower is controlled to be 0.5% - 2%; the mass concentration of the alkaline solution in the caustic washing tower is controlled to be 10% - 40%; the alkaline solution is sodium hydroxide solution and / or potassium hydroxide solution.

[0017] As a further improvement of the above technical solution: in step S2, the sulfur-containing waste gas passes through the pickling tower, desulfurization tower, caustic washing tower, and water washing tower in a bottom-up manner.

[0018] As a further improvement of the above technical solution: in step S1, when the number of the desulfurization towers is two, the mass concentrations of chlorine dioxide in the first and second desulfurization towers are 0.5% - 2% and 1% - 2% respectively;

[0019] As a further improvement of the above technical solution: in step S2, the sulfur-containing components in the sulfur-containing waste gas include at least one substance shown in formula (I) and formula (II):

[0020]

[0021] In formula (I) and formula (II), R is one of -H, -CH 3 , -CH 2 CH 3 , -CH 2 CH 2 CH 3 , -CH(CH 3 )CH 3 ; R 1 is one of -H, -CH 3 , -CH 2 CH 3 , -CH 2 CH 2 CH 3 , -CH(CH 3 )CH 3 .

[0022] Compared with the prior art, the advantages of the present invention are as follows:

[0023] (1) The present invention provides a treatment system for sulfur-containing waste gas, including a desulfurization tower, an alkali washing tower and a water washing tower connected in sequence. The provided desulfurization tower can not only directly dissolve the water-soluble inorganic sulfur components in the sulfur-containing waste gas into the water phase of the desulfurization tower, but also convert the volatile organic sulfur components with a bad smell in the sulfur-containing waste gas into components with no bad smell and low volatility or easy solubility in water, so that they enter the water phase of the desulfurization tower, thereby effectively removing the sulfur-containing components in the waste gas. Then, through the treatment of the alkali washing tower, the acidic gas diffused from the desulfurization tower is absorbed and removed. Finally, through the treatment of the water washing tower, the alkali mist coming out of the alkali washing tower is absorbed and removed, ultimately realizing the effective purification of the waste gas and reaching the standard for discharge. Compared with the RTO incinerator, the treatment system for sulfur-containing waste gas of the present invention has the advantages of simple structure, small investment, low operation cost, good purification effect, high safety factor, easy engineering promotion, etc., with high use value and good application prospect.

[0024] (2) The present invention also provides a method for treating sulfur-containing waste gas, which has the advantages of simple operation, low cost, high treatment efficiency, good treatment effect, no secondary air pollution, etc., and is suitable for widely treating sulfur-containing waste gas from different sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0026] Figure 1 It is a schematic structural diagram of the sulfur-containing waste gas treatment system in Embodiment 1 of the present invention.

[0027] LEGEND DESCRIPTION:

[0028] 1. Pickling tower; 2. Desulfurization tower; 3. Alkali washing tower; 4. Water washing tower; 5. Chlorine dioxide storage device; 6. Water injector; 7. First distributor; 8. First circulation pump; 9. Second distributor; 10. Second circulation pump; 11. Third distributor; 12. Third circulation pump; 13. Fourth distributor; 14. Fourth circulation pump; 15. Air supply device; 16. First valve; 17. Second valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present invention will be further described below in conjunction with the accompanying drawings of the specification and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0030] Embodiment 1

[0031] As Figure 1 shown, the sulfur-containing waste gas treatment system of this embodiment includes a desulfurization tower 2 connected in sequence for removing sulfur-containing components in the sulfur-containing waste gas, an alkali washing tower 3 for removing acidic gases in the tail gas of the desulfurization tower 2, and a water washing tower 4 for removing alkali mist in the tail gas of the alkali washing tower 3.

[0032] In this embodiment, the desulfurization tower 2 can fully combine the sulfur-containing components in the waste gas with the desulfurizing agent (such as chlorine dioxide solution) in the solution, oxidize to remove the odor and enter the aqueous phase of the desulfurization tower, thereby effectively removing the sulfur-containing components in the waste gas. Then, through the treatment of the alkali washing tower 3, the acidic gases emitted from the desulfurization tower 2 are absorbed and removed. Finally, through the treatment of the water washing tower 4, the alkali mist coming out of the alkali washing tower 3 is absorbed and removed, ultimately achieving effective purification and up-to-standard discharge of the waste gas. Compared with the RTO incinerator, the sulfur-containing waste gas treatment system of the present invention has the advantages of simple structure, small investment, low operating cost, good purification effect, high safety factor, easy engineering promotion, etc., high use value and good application prospect.

[0033] In this embodiment, the number of desulfurization towers 2 is two, which are connected in series. In this embodiment, the sulfur-containing components in the waste gas are oxidized by the primary desulfurization tower, and the sulfur-containing components in the waste gas are deeply oxidized by the secondary desulfurization tower. Therefore, by setting two desulfurization towers 2 connected in series, on the premise of ensuring the rapid and complete removal of sulfur-containing components in the waste gas, not only can the utilization rate of chlorine dioxide be improved, its usage amount and treatment cost be reduced, but also the safety factor of the treatment system can be provided, which is beneficial to realizing safe production. In the present invention, the number of desulfurization towers 2 is at least one, not limited to two, and the number can meet the effective removal of sulfur-containing components in the waste gas, such as one, two, three, four, etc. are all acceptable.

[0034] In this embodiment, a first distributor 7 for spraying chlorine dioxide solution is provided above the desulfurization tower 2; the first distributor 7 is connected to the bottom of the desulfurization tower 2 through a pipeline; a first circulation pump 8 is provided on the pipeline between the desulfurization tower 2 and the first distributor 7; a first valve 16 is provided between the first distributor 7 and the first circulation pump 8. In this treatment system, by the distribution function of the first distributor 7, the contact rate between the chlorine dioxide solution and the waste gas can be further improved, thereby improving the desulfurization efficiency of the desulfurization tower 2, which is beneficial to improving the treatment efficiency and purification effect of the treatment system on the waste gas. At the same time, through the action of the first circulation pump 8, the utilization rate of the chlorine dioxide solution can also be further improved. On the premise of improving the utilization rate of the chlorine dioxide solution, the treatment cost can be further reduced, which is beneficial to reducing the operating cost of the treatment system.

[0035] In this embodiment, a chlorine dioxide storage device 5 is also connected to the first distributor 7; a water injector 6 is provided on the pipeline between the first distributor 7 and the chlorine dioxide storage device 5; a one-way valve is provided on the pipeline from the chlorine dioxide storage device 5 to the water injector 6; the water injector 6 is connected to the first circulation pump 8 through a pipeline; a second valve 17 is provided between the water injector 6 and the first circulation pump 8; the chlorine dioxide storage device 5 is a chlorine dioxide storage tank or a chlorine dioxide generator, specifically a chlorine dioxide generator (a device for preparing chlorine dioxide gas). In this treatment system, the lost chlorine dioxide in the desulfurization tower 2 can be directly supplemented through the chlorine dioxide storage device 5, or the lost chlorine dioxide solution can be supplemented to the desulfurization tower through the chlorine dioxide storage device 5 and the water injector 6. Thus, it can ensure the continuous action of the desulfurization tower 2 on the sulfur-containing components in the waste gas, and can realize the continuous treatment of the waste gas. While reducing the operating cost, the treatment efficiency can also be improved. In addition, in this treatment system, the chlorine dioxide is pumped into the aqueous solution in the desulfurization tower 2 through the negative pressure generated by the water injector 6, and it is dissolved in water to form an aqueous solution and then sprayed into the desulfurization tower (2), so that the possibility of gas explosion can be reduced.

[0036] Such as Figure 1As shown, in this embodiment, the bottom of the desulfurization tower 2 is also connected to an acid scrubber 1 for absorbing the alkaline components in the sulfur-containing waste gas; above the acid scrubber 1, a second distributor 9 for spraying an acidic solution is provided; the second distributor 9 is connected to the bottom of the acid scrubber 1 through a pipeline; a second circulation pump 10 is provided on the pipeline between the second distributor 9 and the acid scrubber 1. In this treatment system, the provided acid scrubber 1 can effectively remove the alkaline components in the waste gas, thereby reducing the adverse effects brought by the alkaline components in the waste gas to the desulfurization tower 2, ensuring that the desulfurization tower 2 can quickly and efficiently remove the sulfur-containing components in the waste gas, which is beneficial to the stable operation of the treatment system; at the same time, by the distribution function of the second distributor 9, the contact rate between the acidic solution and the waste gas can be further improved, thereby improving the pickling efficiency of the acid scrubber 1, which is beneficial to improving the treatment efficiency and purification effect of the treatment system on the waste gas; further, through the action of the second circulation pump 10, the utilization rate of the acidic solution can also be further improved, and the treatment cost can be further reduced on the premise of improving the utilization rate of the acidic solution, which is beneficial to reducing the operation cost of the treatment system.

[0037] As Figure 1 shown, the bottom of the acid scrubber 1 is also connected to a gas supply device 15 for transporting the sulfur-containing waste gas; the gas supply device 15 is a suction fan. In this treatment system, the provided gas supply device 15 can effectively control the flow rate of the waste gas, thereby effectively regulating the operation load of the treatment system, which is beneficial to the stable operation of the treatment system.

[0038] In this embodiment, above the alkali scrubber 3, a third distributor 11 for spraying an alkaline solution is provided; the third distributor 11 is connected to the bottom of the alkali scrubber 3 through a pipeline; a third circulation pump 12 is provided on the pipeline between the third distributor 11 and the alkali scrubber 3. In this treatment system, by the distribution function of the third distributor 11, the contact rate between the alkaline solution and the waste gas can be further improved, thereby improving the alkali scrubbing efficiency of the alkali scrubber 3, which is beneficial to improving the treatment efficiency and purification effect of the treatment system on the waste gas; at the same time, through the action of the third circulation pump 12, the utilization rate of the alkaline solution can also be further improved, and the treatment cost can be further reduced on the premise of improving the utilization rate of the alkaline solution, which is beneficial to reducing the operation cost of the treatment system.

[0039] In this embodiment, a fourth distributor 13 for spraying water is provided above the water washing tower 4; the fourth distributor 13 is communicated with the bottom of the water washing tower 4 through a pipeline; a fourth circulation pump 14 is provided on the pipeline between the fourth distributor 13 and the water washing tower 4. In this treatment system, by means of the layout of the fourth distributor 13, the contact rate between water and waste gas can be further increased, so that the water washing efficiency of the water washing tower 4 can be improved, which is beneficial to improving the treatment efficiency and purification effect of the treatment system on waste gas; at the same time, through the action of the fourth circulation pump 14, the utilization rate of water can be further increased, and the treatment cost can be further reduced on the premise of improving the water utilization rate, which is beneficial to reducing the operation cost of the treatment system.

[0040] In this embodiment, the main chemical reaction processes in each treatment tower are as follows:

[0041] Pickling tower:

[0042]

[0043] Desulfurization tower:

[0044]

[0045]

[0046] Alkali washing tower:

[0047] HCI + NaOH → NaCI + H 2 O

[0048] In this embodiment, the sulfur-containing components in the sulfur-containing waste gas include at least one of the substances shown in formula (I) and formula (II):

[0049]

[0050] In formula (I) and formula (II), R is one of -H, -CH 3 , -CH 2 CH 3 , -CH 2 CH 2 CH 3 , -CH(CH 3 )CH 3 ; R 1 is one of -H, -CH 3 , -CH 2 CH 3 , -CH 2 CH 2 CH 3 , -CH(CH 3 )CH 3 .

[0051] Example 2

[0052] A method for treating sulfur-containing waste gas, using the treatment system of Example 1 to treat the sulfur-containing waste gas, including the following steps:

[0053] S1. Sequentially introduce sulfuric acid solution with a mass concentration of 30%, water, sodium hydroxide solution with a mass concentration of 30%, and water (each with a dosage of 1 t) into the pickling tower 1, desulfurization tower 2, alkali washing tower 3, and water washing tower 4, and start the corresponding circulating pumps.

[0054] S2. Introduce chlorine dioxide into the desulfurization tower 2, dissolve it into the circulating water of the desulfurization tower 2, and form a chlorine dioxide solution to be sprayed into the desulfurization tower 2. Among them, the mass concentrations of the chlorine dioxide solution in the first and second desulfurization towers 2 arranged in sequence are 1% (the first desulfurization tower 2) and 2% (the second desulfurization tower 2). In this example, chlorine dioxide is prepared by a chlorine dioxide generator during the circulation process and continuously supplemented into the desulfurization tower 2.

[0055] S2. Start the induced draft fan, and pass the sulfur-containing waste gas (from the waste gas of the methomyl workshop, the sulfur-containing components and their contents are: methanethiol 30.1 g / m 3 / h) through the pickling tower 1, desulfurization tower 2, alkali washing tower 3, and water washing tower 4 in sequence to complete the treatment of the sulfur-containing waste gas. The tail gas after being treated by the above treatment system is directly discharged to the outside. 3 、dimethyl disulfide 18.9 g / m 3 )

[0056] Operate continuously for 24 h (the entire system operates continuously and the tail gas is continuously discharged), and randomly sample and detect during this process. During this operation time, methanethiol is not detected in the tail gas, dimethyl disulfide is not detected either, and the waste gas has no obvious odor.

[0057] Example 3

[0058] A method for treating sulfur-containing waste gas, using the treatment system of Example 1 to treat the sulfur-containing waste gas, including the following steps:

[0059] S1. Sequentially introduce sulfuric acid solution with a mass concentration of 30%, water, sodium hydroxide solution with a mass concentration of 30%, and water (each with a dosage of 1 t) into the pickling tower 1, desulfurization tower 2, alkali washing tower 3, and water washing tower 4, and start the corresponding circulating pumps.

[0060] S2. Chlorine dioxide is introduced into the desulfurization tower 2 and dissolved in the circulating water of the desulfurization tower 2 to form a chlorine dioxide solution, which is sprayed into the desulfurization tower 2. The mass concentrations of the chlorine dioxide solution in the first and second desulfurization towers 2 arranged in sequence are 0.5% (the first desulfurization tower 2) and 1% (the second desulfurization tower 2), respectively. In this embodiment, chlorine dioxide is prepared by a chlorine dioxide generator during the circulation process and continuously supplemented into the desulfurization tower 2.

[0061] S2. Turn on the exhaust fan and, at a flow rate of 500 m 3 / h, pass the sulfur-containing waste gas (from the waste gas of the storage workshop, the sulfur-containing components and their contents are: hydrogen sulfide 10.3 g / m 3 , methyl mercaptan 16.7 g / m 3 ) through the pickling tower 1, desulfurization tower 2, alkali washing tower 3 and water washing tower 4 in sequence to complete the treatment of the sulfur-containing waste gas. The tail gas treated by the above treatment system is directly discharged.

[0062] Continuously operate for 24 h (the whole system operates continuously and the tail gas is continuously discharged), and randomly sample and detect during this process. During this operation time, methyl mercaptan is not detected in the tail gas, hydrogen sulfide is not detected either, and the waste gas has no obvious odor.

[0063] Comparative Example 1

[0064] A method for treating sulfur-containing waste gas is basically the same as that in Example 2, the only difference being that: in Comparative Example 1, the mass concentrations of the chlorine dioxide solution in the first and second desulfurization towers 2 arranged in sequence are 0.5% (the first desulfurization tower 2) and 0.4% (the second desulfurization tower 2), respectively.

[0065] Continuously operate for 24 h (the whole system operates continuously and the tail gas is continuously discharged), and randomly sample and detect during this process. During this operation time, the average content of methyl mercaptan in the tail gas is 5.8 g / m 3 , the average content of dimethyl disulfide is 3.3 g / m 3 , and the waste gas has an obvious bad odor.

[0066] Comparative Example 2

[0067] A method for treating sulfur-containing waste gas is basically the same as that in Example 3, the only difference being that: in Comparative Example 1, the mass concentrations of the chlorine dioxide solution in the first and second desulfurization towers 2 arranged in sequence are 0.3% (the first desulfurization tower 2) and 0.5% (the second desulfurization tower 2), respectively.

[0068] Continuously operate for 24 h (the whole system operates continuously and the tail gas is continuously discharged), and randomly sample and detect during this process. During this operation time, the average content of methyl mercaptan in the tail gas is 2.6 g / m 3 , hydrogen sulfide is not detected, and the waste gas has an obvious bad odor.

[0069] Table 1 Influence of chlorine dioxide solutions with different concentrations on the treatment effect of sulfur-containing waste gas

[0070]

[0071]

[0072] Note: In Table 1, the treatment conditions in Comparative Example 1 and Comparative Example 2 are basically the same as those in Example 2 and Example 3, with the only difference being that the concentrations of the chlorine dioxide solutions in the desulfurization tower 2 in Example 2, Example 3, Comparative Example 1 and Comparative Example 2 are different. It can be seen from Table 1 that when the number of desulfurization towers 2 is two, a chlorine dioxide solution with too low a concentration cannot effectively deodorize. In addition, without considering the concentration of the chlorine dioxide solution, effective deodorization of sulfur-containing waste gas can be achieved by increasing the number of desulfurization towers 2.

[0073] The above embodiments are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A method for treating sulfur-containing waste gas, characterized in that, a treatment system is used to treat the sulfur-containing waste gas, including the following steps: S1. Acidic solution, chlorine dioxide solution, alkaline solution, and water are sequentially introduced into the pickling tower (1), desulfurization tower (2), alkali washing tower (3), and water washing tower (4), and the corresponding circulation pumps of each tower are started; S2. The sulfur-containing waste gas is sequentially passed through the pickling tower (1), desulfurization tower (2), alkali washing tower (3), and water washing tower (4) in step S1 to complete the treatment of the sulfur-containing waste gas; the sulfur-containing components in the sulfur-containing waste gas include at least one of the substances shown in formula (I) and formula (II): In formulas (I) and (II), R is -H, -CH 3 , -CH 2 CH 3 , -CH 2 CH 2 CH 3 , -CH(CH 3 )CH 3 being one of them; R 1 is -H, -CH 3 , -CH 2 CH 3 , -CH 2 CH 2 CH 3 , -CH(CH 3 )CH 3 being one of them; The treatment system includes a desulfurization tower (2), an alkali washing tower (3), and a water washing tower (4) that are sequentially connected and used to remove sulfur-containing components in the sulfur-containing waste gas. The number of the desulfurization towers (2) is two, and the desulfurization towers (2) are connected in series. The mass concentrations of chlorine dioxide in the first and second desulfurization towers (2) are 0.5% - 2% and 1% - 2% respectively; the bottom of the desulfurization tower (2) is also connected to a pickling tower (1) for absorbing alkaline components in the sulfur-containing waste gas; the bottom of the pickling tower (1) is also connected to a gas supply device (15) for transporting the sulfur-containing waste gas.

2. The treatment method according to claim 1, characterized in that, in step S1, the mass concentration of the pickling solution in the pickling tower (1) is controlled to be 5% - 30%; the acidic solution is sulfuric acid solution and / or hydrochloric acid solution; the mass concentration of the alkaline solution in the alkali washing tower (3) is controlled to be 10% - 40%; the alkaline solution is sodium hydroxide solution and / or potassium hydroxide solution; in step S2, the sulfur-containing waste gas passes through the pickling tower (1), desulfurization tower (2), alkali washing tower (3), and water washing tower (4) in a bottom-up manner.

3. The treatment method according to claim 1, characterized in that, a first cloth distributor (7) for spraying chlorine dioxide solution is provided above the desulfurization tower (2); the first cloth distributor (7) is connected to the bottom of the desulfurization tower (2) through a pipeline; a first circulation pump (8) is provided on the pipeline between the desulfurization tower (2) and the first cloth distributor (7); a first valve (16) is provided between the first cloth distributor (7) and the first circulation pump (8).

4. The treatment method according to claim 3, characterized in that, a chlorine dioxide storage device (5) is also connected to the first cloth distributor (7); a water injector (6) is provided on the pipeline between the first cloth distributor (7) and the chlorine dioxide storage device (5); a one-way valve is provided on the pipeline from the chlorine dioxide storage device (5) to the water injector (6); the water injector (6) is connected to the first circulation pump (8) through a pipeline; a second valve (17) is provided between the water injector (6) and the first circulation pump (8); the chlorine dioxide storage device (5) is a chlorine dioxide storage tank or a chlorine dioxide generator.

5. The treatment method according to any one of claims 1, 3, and 4, characterized in that, Above the pickling tower (1), a second distributor (9) for spraying acidic solution is provided; the second distributor (9) is communicated with the bottom of the pickling tower (1) through a pipeline; a second circulation pump (10) is provided on the pipeline between the second distributor (9) and the pickling tower (1); the air supply device (15) is a suction fan.

6. The treatment method according to any one of claims 1, 3, and 4, characterized in that above the caustic washing tower (3), a third distributor (11) for spraying alkaline solution is provided; the third distributor (11) is communicated with the bottom of the caustic washing tower (3) through a pipeline; a third circulation pump (12) is provided on the pipeline between the third distributor (11) and the caustic washing tower (3); above the water washing tower (4), a fourth distributor (13) for spraying water is provided; the fourth distributor (13) is communicated with the bottom of the water washing tower (4) through a pipeline; a fourth circulation pump (14) is provided on the pipeline between the fourth distributor (13) and the water washing tower (4).

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