CN113599979A - System and method for treating sulfur-containing waste gas - Google Patents
System and method for treating sulfur-containing waste gas Download PDFInfo
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Abstract
The invention discloses a system and a method for treating sulfur-containing waste gas, wherein the system comprises a sulfur removal tower, an alkaline washing tower and a water washing tower which are sequentially communicated, wherein the sulfur removal tower is arranged, so that sulfur-containing components in the waste gas can be effectively removed, acid gas overflowing from the sulfur removal tower is absorbed and removed through the treatment of the alkaline washing tower, finally, alkali mist coming out of the alkaline washing tower is absorbed and removed through the treatment of the water washing tower, and finally, the effective purification and standard emission of the waste gas are realized. Compared with an RTO incinerator, the treatment system for sulfur-containing waste gas has the advantages of simple structure, low investment, low operation cost, good purification effect, high safety coefficient, easiness in engineering popularization and the like, and is high in use value and good in application prospect; meanwhile, the method for treating the sulfur-containing waste gas by using the treatment system has the advantages of simple operation, low cost, high treatment efficiency, good treatment effect, no secondary air pollution and the like, and is suitable for widely treating sulfur-containing waste gas from different sources.
Description
Technical Field
The invention belongs to the field of waste gas treatment, and relates to a system and a method for treating sulfur-containing waste gas.
Background
However, these sulfur-containing compounds have a low odor threshold and a strong odor, and therefore, in the production, application, and storage processes of these sulfur-containing compounds, sulfur-containing waste gases having an offensive odor are often generated. Common desulfurization processes such as a limestone-gypsum method, an ammonia-ammonium sulfate method, a double-alkali method and the like mainly aim at inorganic sulfur such as sulfur dioxide and the like, and organic sulfur tail gas containing foul smell is generally treated by an RTO (regenerative thermal oxidizer) incineration method, but the incineration method has the disadvantages of large investment, high operation cost and difficulty in popularization, and sulfur dioxide-containing waste gas generated by incineration can be discharged only by further desulfurization.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a sulfur-containing waste gas treatment system which has the advantages of simple structure, small investment, low operation cost, good purification effect, high safety coefficient and easy engineering popularization, and also provides a sulfur-containing waste gas treatment method which has the advantages of simple operation, low cost, high treatment efficiency, good treatment effect and no secondary air pollution.
In order to solve the technical problems, the invention adopts the following technical scheme:
a processing system of sulfur-containing waste gas comprises a sulfur removal tower, an alkaline washing tower and a water washing tower which are sequentially communicated and used for removing sulfur-containing components in the sulfur-containing waste gas.
As a further improvement of the above technical solution: the number of the sulfur removal towers is at least one; when the number of the sulfur removal towers exceeds one, the sulfur removal towers are communicated in series.
As a further improvement of the above technical solution: a first distributor for spraying chlorine dioxide solution is arranged above the inside of the sulfur removal tower; the first distributor is communicated with the bottom of the desulfurizing tower through a pipeline; a first circulating pump is arranged on a pipeline between the desulfurizing tower and the first distributor; a first valve is arranged between the first distributing device and the first circulating pump.
As a further improvement of the above technical solution: the first distributing device is also communicated with a chlorine dioxide storage device; a water ejector is arranged on a pipeline between the first distributing device and the chlorine dioxide storage device; a one-way valve is arranged on a pipeline from the chlorine dioxide storage device to the water ejector; the water ejector is communicated with the first circulating pump through a pipeline; a second valve is arranged between the water ejector and the first circulating pump; the chlorine dioxide storage device is a chlorine dioxide storage tank or a chlorine dioxide generator.
As a further improvement of the above technical solution: the bottom of the sulfur removal tower is also communicated with an acid washing tower for absorbing alkaline components in sulfur-containing waste gas; a second distributor for spraying acid solution is arranged above the inside of the pickling tower; the second distributing device is communicated with the bottom of the pickling tower through a pipeline; a second circulating pump is arranged on a pipeline between the second distributing device and the pickling tower; the bottom of the pickling tower is also communicated with an air supply device for conveying sulfur-containing waste gas; the air supply device is an exhaust fan.
As a further improvement of the above technical solution: a third distributor for spraying alkaline solution is arranged above the inside of the alkaline tower; the third distributing device is communicated with the bottom of the alkaline washing tower through a pipeline; and a third circulating pump is arranged on a pipeline between the third distributing device and the alkaline tower.
As a further improvement of the above technical solution: a fourth distributor for spraying water is arranged above the inside of the water washing tower; the fourth distributing device is communicated with the bottom of the water washing tower through a pipeline; and a fourth circulating pump is arranged on a pipeline between the fourth distributing device and the water washing tower.
As a general technical concept, the invention also provides a method for treating the sulfur-containing waste gas, which adopts the treatment system to treat the sulfur-containing waste gas.
As a further improvement of the above technical solution: the method comprises the following steps:
s1, sequentially introducing an acidic solution, a chlorine dioxide solution, an alkali solution and water into the pickling tower, the desulfurizing tower, the alkaline washing tower and the water washing tower, and starting a circulating pump corresponding to each tower;
and S2, sequentially passing the sulfur-containing waste gas through the acid washing tower, the sulfur removal tower, the alkaline washing tower and the water washing tower in the step S1 to finish the treatment of the sulfur-containing waste gas.
As a further improvement of the above technical solution: in the step S1, the mass concentration of the pickling solution in the pickling tower is controlled to be 5-30%; the acid solution is a sulfuric acid solution and/or a hydrochloric acid solution; the mass concentration of the chlorine dioxide solution in the desulfurizing tower is controlled to be 0.5-2%; controlling the mass concentration of an alkaline solution in the alkaline tower to be 10-40%; the alkaline solution is a sodium hydroxide solution and/or a potassium hydroxide solution.
As a further improvement of the above technical solution: in step S2, the sulfur-containing waste gas passes through an acid wash tower, a sulfur removal tower, an alkaline wash tower, and a water wash tower from bottom to top.
As a further improvement of the above technical solution: in step S1, when the number of the sulfur removal towers is two, the mass concentration of chlorine dioxide in the first sulfur removal tower and the mass concentration of chlorine dioxide in the second sulfur removal tower are respectively 0.5-2% and 1-2%;
as a further improvement of the above technical solution: in step S2, the sulfur-containing component in the sulfur-containing off-gas includes at least one substance represented by formula (i) and formula (ii):
Compared with the prior art, the invention has the advantages that:
(1) the invention provides a treatment system of sulfur-containing waste gas, which comprises a sulfur removal tower, an alkaline washing tower and a water washing tower which are sequentially communicated, wherein the sulfur removal tower is arranged, not only inorganic sulfur components which are easy to dissolve in water in the sulfur-containing waste gas can be directly dissolved into a water phase of the sulfur removal tower, but also volatile organic sulfur components with malodor in the sulfur-containing waste gas can be converted into components which are free of malodor and difficult to volatilize or easy to dissolve in water, and the components enter the water phase of the sulfur removal tower, so that the sulfur-containing components in the waste gas can be effectively removed, the acidic gas overflowing from the sulfur removal tower is absorbed and removed through the treatment of the alkaline washing tower, and finally, the alkaline mist coming out of the alkaline washing tower is absorbed and removed through the treatment of the water washing tower, so that the effective purification and the standard emission of the waste gas can be finally realized. Compared with an RTO incinerator, the treatment system for sulfur-containing waste gas has the advantages of simple structure, low investment, low operation cost, good purification effect, high safety factor, easiness in engineering popularization and the like, and is high in use value and good in application prospect.
(2) The invention also provides a method for treating the sulfur-containing waste gas, which has the advantages of simple operation, low cost, high treatment efficiency, good treatment effect, no secondary air pollution and the like, and is suitable for widely treating the sulfur-containing waste gas from different sources.
Drawings
In order to make the objects, 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 drawings in the embodiments of the present invention.
Fig. 1 is a schematic structural view of a sulfur-containing off-gas treatment system in embodiment 1 of the present invention.
Illustration of the drawings:
1. an acid washing tower; 2. a sulfur removal tower; 3. an alkaline washing tower; 4. washing the tower with water; 5. a chlorine dioxide storage device; 6. a water ejector; 7. a first distributor; 8. a first circulation pump; 9. a second distributor; 10. a second circulation pump; 11. a third distributor; 12. a third circulation pump; 13. a fourth distributor; 14. a fourth circulation pump; 15. an air supply device; 16. a first valve; 17. a second valve.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
Example 1
As shown in fig. 1, the system for treating sulfur-containing waste gas of the present embodiment includes a sulfur removal tower 2 for removing sulfur-containing components from sulfur-containing waste gas, an alkaline washing tower 3 for removing acid gases from the tail gas of the sulfur removal tower 2, and a water washing tower 4 for removing alkaline mist from the tail gas of the alkaline washing tower 3, which are connected in sequence.
In this embodiment, the sulfur removal tower 2 can fully combine the sulfur-containing component in the exhaust gas with the sulfur removal agent (such as chlorine dioxide solution) in the solution, remove the odor after oxidation and enter the water phase of the sulfur removal tower, thereby realizing effective removal of the sulfur-containing component in the exhaust gas, further absorbing and removing the acid gas overflowing from the sulfur removal tower 2 through the treatment of the alkaline washing tower 3, and finally absorbing and removing the alkaline mist coming out from the alkaline washing tower 3 through the treatment of the water washing tower 4, thereby finally realizing effective purification and standard emission of the exhaust gas. Compared with an RTO incinerator, the treatment system for sulfur-containing waste gas has the advantages of simple structure, low investment, low operation cost, good purification effect, high safety factor, easiness in engineering popularization and the like, and is high in use value and good in application prospect.
In this embodiment, the number of the sulfur removal towers 2 is two, and they are connected in series. In this embodiment, carry out oxidation treatment through the sulphur component that contains in one-level desulfurizing tower to the waste gas, carry out degree of depth oxidation treatment through the sulphur component that contains in the second grade desulfurizing tower to the waste gas, therefore through setting up two sulphur towers 2 that remove of establishing ties, under the prerequisite of guaranteeing quick, thorough sulphur component that contains in getting rid of the waste gas, can not only improve chlorine dioxide's rate of utilization, reduce its use amount and treatment cost, can provide processing system's factor of safety moreover, be favorable to realizing the safety in production. In the invention, the number of the sulfur removal tower 2 is at least one, and is not limited to two, and the number can meet the requirement of effectively removing sulfur-containing components in the waste gas, such as one, two, three or four.
In the embodiment, a first distributor 7 for spraying chlorine dioxide solution is arranged above the inside of the sulfur removal tower 2; the first distributor 7 is communicated with the bottom of the desulfurizing tower 2 through a pipeline; a first circulating pump 8 is arranged on a pipeline between the desulfurizing tower 2 and the first distributor 7; a first valve 16 is arranged between the first distributor 7 and the first circulating pump 8. Among this processing system, utilize the effect of laying of first distributing device 7, can further promote the contact rate of chlorine dioxide solution and waste gas, thereby can promote the desulfurization efficiency of desulfurizing tower 2, be favorable to improving processing system to the treatment effeciency and the purifying effect of waste gas, and simultaneously, through the effect of first circulating pump 8, also can further promote the rate of utilization of chlorine dioxide solution, also can further reduce processing cost under the prerequisite that improves chlorine dioxide solution utilization ratio, be favorable to reducing processing system's running cost.
In this embodiment, the first distributor 7 is further communicated with a chlorine dioxide storage device 5; a water ejector 6 is arranged on a pipeline between the first distributing device 7 and the chlorine dioxide storage device 5; a one-way valve is arranged on a pipeline from the chlorine dioxide storage device 5 to the water injector 6; the water ejector 6 is communicated with a first circulating pump 8 through a pipeline; a second valve 17 is arranged between the water ejector 6 and the first circulating pump 8; the chlorine dioxide storage device 5 is a chlorine dioxide storage tank or a chlorine dioxide generator, and specifically is a chlorine dioxide generator (a device for preparing chlorine dioxide gas). In the treatment system, the loss chlorine dioxide can be directly supplemented into the desulfurizing tower 2 through the chlorine dioxide storage device 5, and the loss chlorine dioxide solution can also be supplemented into the desulfurizing tower through the chlorine dioxide storage device 5 and the water injector 6, so that the continuous action of the desulfurizing tower 2 on sulfur-containing components in waste gas can be ensured, the continuous treatment of the waste gas can be realized, the operation cost is reduced, and the treatment efficiency can be improved. In addition, in the treatment system, the chlorine dioxide is pumped to the aqueous solution in the sulfur removal tower 2 through the negative pressure generated by the water ejector 6, and is dissolved in the water to form the aqueous solution which is then sprayed into the sulfur removal tower (2), so that the possibility of gas explosion can be reduced.
As shown in fig. 1, in the present embodiment, the bottom of the sulfur removal tower 2 is also communicated with an acid washing tower 1 for absorbing alkaline components in sulfur-containing waste gas; a second distributor 9 for spraying acid solution is arranged above the inside of the pickling tower 1; the second distributing device 9 is communicated with the bottom of the pickling tower 1 through a pipeline; a second circulating pump 10 is arranged on a pipeline between the second distributing device 9 and the pickling tower 1. In the treatment system, the arranged pickling tower 1 can effectively remove alkaline components in the waste gas, so that the adverse effect of the alkaline components in the waste gas on the desulfurizing tower 2 can be reduced, the desulfurizing tower 2 can be ensured to quickly and efficiently remove sulfur-containing components in the waste gas, and the stable operation of the treatment system is facilitated; meanwhile, the contact rate of the acid solution and the waste gas can be further improved by utilizing the arrangement effect of the second distributing device 9, so that the pickling efficiency of the pickling tower 1 can be improved, and the treatment efficiency and the purification effect of a treatment system on the waste gas can be improved; further, the utilization rate of the acidic solution can be further improved through the action of the second circulating pump 10, the treatment cost can be further reduced on the premise of improving the utilization rate of the acidic solution, and the reduction of the operation cost of the treatment system is facilitated.
As shown in fig. 1, the bottom of the pickling tower 1 is also communicated with a gas feeding device 15 for feeding sulfur-containing waste gas; the air supply device 15 is an exhaust fan. In the treatment system, the air supply device 15 can effectively control the flow of the waste gas, thereby effectively regulating and controlling the operation load of the treatment system and being beneficial to the stable operation of the treatment system.
In this embodiment, a third distributor 11 for spraying an alkaline solution is arranged above the inside of the alkaline tower 3; the third distributing device 11 is communicated with the bottom of the alkaline washing tower 3 through a pipeline; a third circulating pump 12 is arranged on a pipeline between the third distributing device 11 and the alkaline tower 3. In the treatment system, the contact rate of the alkaline solution and the waste gas can be further improved by utilizing the arrangement effect of the third distributing device 11, so that the alkaline washing efficiency of the alkaline washing tower 3 can be improved, and the treatment efficiency and the purification effect of the treatment system on the waste gas can be improved; meanwhile, the utilization rate of the alkaline solution can be further improved through the action of the third circulating pump 12, the treatment cost can be further reduced on the premise of improving the utilization rate of the alkaline solution, and the reduction of the operation cost of a treatment system is facilitated.
In this embodiment, a fourth distributor 13 for spraying water is arranged above the inside of the water washing tower 4; the fourth distributing device 13 is communicated with the bottom of the water washing tower 4 through a pipeline; a fourth circulating pump 14 is arranged on a pipeline between the fourth distributing device 13 and the water washing tower 4. In the treatment system, the contact rate of water and waste gas can be further improved by utilizing the arrangement effect of the fourth distributing device 13, so that the washing efficiency of the washing tower 4 can be improved, and the treatment efficiency and the purification effect of the treatment system on the waste gas can be improved; meanwhile, the utilization rate of water can be further improved through the action of the fourth circulating pump 14, the treatment cost can be further reduced on the premise of improving the utilization rate of water, and the operation cost of a treatment system is favorably reduced.
In this embodiment, the main chemical reaction processes in each treatment tower are as follows:
acid washing tower:
a desulfurizing tower:
an alkaline washing tower:
HCI+NaOH→NaCI+H2O
in this embodiment, the sulfur-containing component of the sulfur-containing off-gas includes at least one species represented by formula (I) and formula (II):
Example 2
A method for treating sulfur-containing waste gas by using the treatment system of example 1, comprising the steps of:
s1, sequentially introducing a sulfuric acid solution with the mass concentration of 30%, water, a sodium hydroxide solution with the mass concentration of 30% and water (the use amounts of the sulfuric acid solution, the water, the sodium hydroxide solution and the water are all 1t) into the acid washing tower 1, the sulfur removal tower 2, the alkali washing tower 3 and the water washing tower 4, and starting corresponding circulating pumps.
S2, introducing chlorine dioxide into the desulfurizing tower 2, dissolving the chlorine dioxide into circulating water of the desulfurizing tower 2, and spraying chlorine dioxide solution into the desulfurizing tower 2, wherein the mass concentration of the chlorine dioxide solution in the first desulfurizing tower 2 and the mass concentration of the chlorine dioxide solution in the second desulfurizing tower 2 which are sequentially arranged are respectively 1% (the first desulfurizing tower 2) and 2% (the second desulfurizing tower 2). In this embodiment, chlorine dioxide is generated by a chlorine dioxide generator during the circulation process and is continuously replenished into the sulfur removal tower 2.
S2, starting an exhaust fan according to the flow of 1250m3H, sulfur-containing waste gas (from methomyl plant)The waste gas contains the following components in percentage by weight: methyl mercaptan 30.1g/m318.9g/m dimethyl disulfide3) The treatment of the sulfur-containing waste gas is completed sequentially through an acid cleaning tower 1, a sulfur removal tower 2, an alkaline cleaning tower 3 and a water cleaning tower 4. The tail gas treated by the treatment system is directly discharged.
The operation is continuous for 24h (the whole system is continuously operated, tail gas is continuously discharged), and random sampling detection is carried out in the process. During this run time, neither methyl mercaptan nor dimethyl disulfide was detected in the tail gas and the off gas had no significant off-flavor.
Example 3
A method for treating sulfur-containing waste gas by using the treatment system of example 1, comprising the steps of:
s1, sequentially introducing a sulfuric acid solution with the mass concentration of 30%, water, a sodium hydroxide solution with the mass concentration of 30% and water (the use amounts of the sulfuric acid solution, the water, the sodium hydroxide solution and the water are all 1t) into the acid washing tower 1, the sulfur removal tower 2, the alkali washing tower 3 and the water washing tower 4, and starting corresponding circulating pumps.
S2, introducing chlorine dioxide into the desulfurizing tower 2, dissolving the chlorine dioxide into circulating water of the desulfurizing tower 2, and spraying the chlorine dioxide solution into the desulfurizing tower 2, wherein the mass concentration of the chlorine dioxide solution in the first desulfurizing tower 2 and the mass concentration of the chlorine dioxide solution in the second desulfurizing tower 2 which are sequentially arranged are respectively 0.5 percent (the first desulfurizing tower 2) and 1 percent (the second desulfurizing tower 2). In this embodiment, chlorine dioxide is generated by a chlorine dioxide generator during the circulation process and is continuously replenished into the sulfur removal tower 2.
S2, starting an exhaust fan according to the flow rate of 500m3The sulfur-containing waste gas (waste gas from storage workshop, sulfur-containing component and its content are 10.3g/m hydrogen sulfide)3Methyl mercaptan 16.7g/m3) The treatment of the sulfur-containing waste gas is completed sequentially through an acid cleaning tower 1, a sulfur removal tower 2, an alkaline cleaning tower 3 and a water cleaning tower 4. The tail gas treated by the treatment system is directly discharged.
The operation is continuous for 24h (the whole system is continuously operated, tail gas is continuously discharged), and random sampling detection is carried out in the process. During the running time, no methyl mercaptan or hydrogen sulfide is detected in the tail gas, and the waste gas has no obvious odor.
Comparative example 1
A method for treating sulfur-containing waste gas, which is substantially the same as that in example 2, except that: the mass concentrations of the chlorine dioxide solution in the first and second sulfur removal towers 2 arranged in this order in comparative example 1 were 0.5% (first sulfur removal tower 2) and 0.4% (second sulfur removal tower 2), respectively.
The operation is continuous for 24h (the whole system is continuously operated, tail gas is continuously discharged), and random sampling detection is carried out in the process. During this operating time, the mean content of methyl mercaptan in the tail gas was 5.8g/m3The average content of dimethyldisulfide was 3.3g/m3The exhaust gas has obvious foul smell.
Comparative example 2
A method for treating sulfur-containing waste gas, which is substantially the same as that in example 3 except that: the mass concentrations of the chlorine dioxide solution in the first and second sulfur removal towers 2 arranged in this order in comparative example 1 were 0.3% (first sulfur removal tower 2) and 0.5% (second sulfur removal tower 2), respectively.
The operation is continuous for 24h (the whole system is continuously operated, tail gas is continuously discharged), and random sampling detection is carried out in the process. During this operating time, the mean content of methyl mercaptan in the tail gas was 2.6g/m3Hydrogen sulfide is not detected, and waste gas has obvious foul smell.
TABLE 1 influence of chlorine dioxide solutions of different concentrations on the treatment of sulfur-containing waste gases
Remarking: in table 1, the treatment conditions in comparative example 1 and comparative example 2 are substantially the same as those in examples 2 and 3 except that: the concentrations of chlorine dioxide solution in the sulfur removal tower 2 in example 2, example 3, comparative example 1 and comparative example 2 were different. As can be seen from table 1, when the number of the sulfur removal towers 2 is two, the chlorine dioxide solution having too low concentration cannot be effectively deodorized. In addition, on the premise of not considering the concentration of the chlorine dioxide solution, the effective deodorization of the sulfur-containing waste gas can be realized by increasing the number of the sulfur removal towers 2.
The above examples are merely preferred embodiments of the present invention, and the scope of the present invention is not limited to the above examples. All technical schemes belonging to the idea of the invention belong to the protection scope of the invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention, and such modifications and embellishments should also be considered as within the scope of the invention.
Claims (10)
1. The system for treating the sulfur-containing waste gas is characterized by comprising a sulfur removal tower (2), an alkaline washing tower (3) and a water washing tower (4) which are communicated in sequence and used for removing sulfur-containing components in the sulfur-containing waste gas.
2. The treatment system according to claim 1, wherein the number of the sulphur removal columns (2) is at least one; when the number of the sulfur removal towers (2) exceeds one, the sulfur removal towers (2) are communicated in series.
3. The treatment system according to claim 2, characterized in that a first distributor (7) for spraying chlorine dioxide solution is arranged above and inside the sulphur removal tower (2); the first distributor (7) is communicated with the bottom of the desulfurizing tower (2) through a pipeline; a first circulating pump (8) is arranged on a pipeline between the desulfurizing tower (2) and the first distributor (7); a first valve (16) is arranged between the first distributing device (7) and the first circulating pump (8).
4. The treatment system according to claim 2, characterized in that said first distributor (7) is also connected to a chlorine dioxide storage device (5); a water ejector (6) is arranged on a pipeline between the first distributor (7) and the chlorine dioxide storage device (5); a one-way valve is arranged on a pipeline from the chlorine dioxide storage device (5) to the water ejector (6); the water ejector (6) is communicated with a first circulating pump (8) through a pipeline; a second valve (17) is arranged between the water ejector (6) and the first circulating pump (8); the chlorine dioxide storage device (5) is a chlorine dioxide storage tank or a chlorine dioxide generator.
5. The treatment system according to any one of claims 1 to 4, wherein the bottom of the sulfur removal tower (2) is also communicated with an acid washing tower (1) for absorbing alkaline components in sulfur-containing waste gas; a second distributor (9) for spraying acid solution is arranged above the inside of the pickling tower (1); the second distributing device (9) is communicated with the bottom of the pickling tower (1) through a pipeline; a second circulating pump (10) is arranged on a pipeline between the second distributing device (9) and the pickling tower (1); the bottom of the pickling tower (1) is also communicated with an air feeding device (15) for conveying sulfur-containing waste gas; the air supply device (15) is an exhaust fan.
6. The treatment system according to any one of claims 1 to 4, wherein a third distributor (11) for spraying an alkaline solution is arranged above the inside of the alkaline tower (3); the third distributing device (11) is communicated with the bottom of the alkaline washing tower (3) through a pipeline; a third circulating pump (12) is arranged on a pipeline between the third distributing device (11) and the alkaline washing tower (3);
a fourth distributor (13) for spraying water is arranged above the inside of the water washing tower (4); the fourth distributing device (13) is communicated with the bottom of the water washing tower (4) through a pipeline; and a fourth circulating pump (14) is arranged on a pipeline between the fourth distributing device (13) and the water washing tower (4).
7. A method for treating sulfur-containing waste gas, characterized in that the sulfur-containing waste gas is treated by the treatment system according to any one of claims 1 to 6.
8. The process of claim 7, comprising the steps of:
s1, sequentially introducing an acidic solution, a chlorine dioxide solution, an alkali solution and water into the pickling tower (1), the desulfurizing tower (2), the alkaline washing tower (3) and the water washing tower (4), and starting a circulating pump corresponding to each tower;
s2, the sulfur-containing waste gas passes through the acid washing tower (1), the sulfur removal tower (2), the alkaline washing tower (3) and the water washing tower (4) in sequence in the step S1, and the sulfur-containing waste gas is treated.
9. The treatment method according to claim 8, wherein in step S1, the mass concentration of the pickling solution in the pickling tower (1) is controlled to be 5-30%; the acid solution is a sulfuric acid solution and/or a hydrochloric acid solution; the mass concentration of the chlorine dioxide solution in the desulfurizing tower (2) is controlled to be 0.5-2%; the mass concentration of the alkaline solution in the alkaline tower (3) is controlled to be 10-40%; the alkaline solution is a sodium hydroxide solution and/or a potassium hydroxide solution;
in step S2, the sulfur-containing waste gas passes through an acid washing tower (1), a sulfur removal tower (2), an alkali washing tower (3) and a water washing tower (4) from bottom to top.
10. The process according to claim 9, wherein in step S1, when the number of the sulfur removal towers (2) is two, the mass concentration of chlorine dioxide in the first and second sulfur removal towers (2) is 0.5-2% and 1-2%, respectively;
in step S2, the sulfur-containing component in the sulfur-containing off-gas includes at least one substance represented by formula (i) and formula (ii):
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