Sulfur dioxide tail gas absorption device and treatment system

Abstract

The utility model relates to the technical field of environmental protection, and discloses a sulfur dioxide tail gas absorption device which comprises a reaction unit, a spraying absorption unit, a circulating unit and a heat exchange unit, a tail gas input pipe is arranged on the reaction unit and / or the spraying absorption unit; the heat exchange unit is provided with a refrigerant side and a medium side; a first control valve is arranged on the refrigerant side; a temperature sensor is arranged in the reaction unit; the tail gas input pipe is further provided with a flow sensor in a matched mode. Meanwhile, the utility model also discloses a sulfur dioxide tail gas treatment system with the sulfur dioxide tail gas absorption device. The heat exchange unit is arranged on the circulating unit, the absorption liquid can be cooled in the absorption liquid circulating process, the opening degree of the first control valve can be controlled according to signals of the temperature sensor and the flow sensor, instantaneous large-flow sulfur dioxide tail gas can be absorbed, the boiling phenomenon of the reaction unit is avoided, and the service life of the reaction unit is prolonged. The sulfur dioxide tail gas treatment efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection, and particularly relates to a sulfur dioxide tail gas absorption device and a treatment system. Background Art

[0002] Sulfur dioxide is an important gas in many industrial processes, especially generated in oil refining, metal smelting and chemical synthesis. However, sulfur dioxide is also a harmful pollutant with many negative impacts on the environment and human health.

[0003] Chinese Patent CN103007710B discloses a sodium silicate tail gas treatment process, belonging to the technical field of chemical tail gas treatment, including dust removal and cooling of sodium silicate tail gas, and then reacting the cooled sodium silicate tail gas with the circulating liquid in several stages of tail gas absorption devices until the sulfur dioxide content in the sodium silicate tail gas meets the standard; at the same time, a sodium silicate tail gas treatment device is also disclosed, including a dust removal device, a cooling and heat exchange device and several stages of absorption devices connected in sequence, and a spray pipe for atomizing the circulating liquid is arranged in each stage of absorption device.

[0004] The above technical solution increases the contact area between liquid alkali and sulfur dioxide by spraying the liquid alkali, thereby improving the reaction rate. However, for batch reactions, the generated sulfur dioxide tail gas has the characteristics of large instantaneous flow rate and small normal flow rate, and the reaction between sulfur dioxide and liquid alkali is an exothermic reaction. If the temperature is not controlled, when the instantaneous flow rate of sulfur dioxide tail gas is large, the reaction will be more intense, resulting in a sharp rise in temperature, and the water in the liquid alkali will boil, accompanied by the release of steam, affecting the treatment efficiency of sulfur dioxide. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the above problems, and provides a sulfur dioxide tail gas absorption device. By setting a heat exchange unit on the circulation unit, this device can cool the absorption liquid during the process of circulating the absorption liquid, and the first control valve on the heat exchange unit can control the opening degree according to the signals of the temperature sensor and the flow sensor, so as to absorb sulfur dioxide tail gas with large instantaneous flow rate, avoid the boiling phenomenon in the reaction unit, and improve the treatment efficiency of sulfur dioxide tail gas.

[0006] At the same time, the utility model also provides a sulfur dioxide tail gas treatment system, which can perform secondary absorption on the sulfur dioxide in the tail gas discharged from the tail gas outlet of the sulfur dioxide tail gas absorption device to ensure the maximum sulfur dioxide absorption effect.

[0007] To achieve the above purpose, the utility model provides the following technical solutions:

[0008] A sulfur dioxide tail gas absorption device, comprising a reaction unit, a spray absorption unit, a circulation unit and a heat exchange unit;

[0009] A tail gas input pipe is provided on the reaction unit and / or the spray absorption unit; the heat exchange unit has a refrigerant side and a medium side;

[0010] The circulation unit is used to transport the absorption liquid in the reaction unit to the spray absorption unit through the medium side of the heat exchange unit; the spray absorption unit is provided with a tail gas output port;

[0011] A first control valve is provided on the refrigerant side; a temperature sensor is provided in the reaction unit; the tail gas input pipe is also equipped with a flow sensor for detecting the sulfur dioxide tail gas;

[0012] The first control valve acts according to the signals of the temperature sensor and the flow sensor.

[0013] Preferably, the heat exchange unit is one of a plate heat exchanger, a shell-and-tube heat exchanger, and an air heat exchanger.

[0014] Preferably, the reaction unit is arranged in the spray absorption unit, or, the reaction unit is a reaction kettle and the spray absorption unit is connected to the gas outlet of the reaction kettle.

[0015] Preferably, the circulation unit is provided with a flow control module; the flow control module is used to control the circulation flow of the circulation unit; the flow control module acts according to the signals of the flow sensor and / or the temperature sensor.

[0016] Preferably, a pH sensor is further provided on the reaction unit, a liquid inlet pipe is provided on the reaction unit, the liquid inlet pipe is communicated with an external absorption liquid conveying device, and a second control valve is provided on the liquid inlet pipe, and the second control valve acts according to the signal of the pH sensor.

[0017] Preferably, a discharge pipe for discharging the absorption liquid in the reaction unit and the product formed by the reaction of the absorption liquid and sulfur dioxide is provided on the reaction unit or the circulation unit, and a valve is provided on the discharge pipe.

[0018] Preferably, the circulation unit includes a circulation pipeline and a delivery pump arranged on the circulation pipeline. One end of the circulation pipeline is connected to the bottom of the reaction unit, the other end of the circulation pipeline is connected to the spray absorption unit, the heat exchange unit is arranged on the circulation pipeline, and the delivery pump and the heat exchange unit are arranged in sequence along the conveying direction of the circulation pipeline, and the discharge pipe is connected between the delivery pump and the heat exchange unit.

[0019] At the same time, the utility model also discloses a sulfur dioxide tail gas treatment system, comprising a first tail gas absorption device and a second tail gas absorption device connected in series; the first tail gas absorption device is the sulfur dioxide tail gas absorption device as described above; the second tail gas absorption device is used to absorb sulfur dioxide in the tail gas discharged from the tail gas output port of the first tail gas absorption device.

[0020] Preferably, the second tail gas absorption device is an absorption tower, a scrubbing tower, a bed adsorption device or the sulfur dioxide tail gas absorption device as described above;

[0021] If the second tail gas absorption device is a sulfur dioxide tail gas absorption device, the tail gas output port of the first tail gas absorption device is communicated with the tail gas input pipe of the second tail gas absorption device; the tail gas input pipe of the first tail gas absorption device is connected to an external sulfur dioxide tail gas source; the tail gas output port of the second tail gas absorption device is connected to an external tail gas treatment device or the atmosphere.

[0022] Preferably, if the second tail gas absorption device is a sulfur dioxide tail gas absorption device, a discharge pipe is provided on the reaction unit of the first tail gas absorption device and the reaction unit of the second tail gas absorption device, or a discharge pipe is provided on the circulation unit of the first tail gas absorption device and the circulation unit of the second tail gas absorption device;

[0023] The discharge pipes of the first tail gas absorption device and the second tail gas absorption device are communicated.

[0024] Compared with the prior art, the beneficial effects of the present utility model are:

[0025] The sulfur dioxide tail gas absorption device of the present utility model can cool the absorption liquid during the process of circulating the absorption liquid by arranging a heat exchange unit on the circulation unit, and the first control valve on the heat exchange unit can control the opening degree according to the signals of the temperature sensor and the flow sensor, can absorb sulfur dioxide tail gas with an instantaneous large flow rate, avoid the phenomenon of boiling in the reaction unit, and improve the treatment efficiency of sulfur dioxide tail gas.

[0026] At the same time, the sulfur dioxide tail gas treatment system of the present utility model can perform secondary absorption on sulfur dioxide in the tail gas discharged from the sulfur dioxide tail gas absorption device, ensuring the maximum sulfur dioxide absorption effect. Description of the Drawings

[0027] Figure 1 is the pipeline diagram of the sulfur dioxide tail gas absorption device in Embodiment 1;

[0028] Figure 2 is the pipeline diagram of the sulfur dioxide tail gas treatment system in Embodiment 2;

[0029] Among them, the reference numerals of each part are as follows:

[0030] Sulfur dioxide tail gas absorption device 1; First tail gas absorption device 2; Second tail gas absorption device 3; Reaction kettle 11; Spray absorption unit 12; Circulation unit 13; Heat exchange unit 14; Tail gas input pipe 15; Discharge pipe 16; Liquid inlet pipe 111; Tail gas output port 121; Circulation pipeline 131; Delivery pump 132; Second control valve 1111. Detailed implementation manners

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0032] Embodiment 1

[0033] Refer to Figure 1 , a sulfur dioxide tail gas absorption device, including a reaction unit, a spray absorption unit 12, a circulation unit 13 and a heat exchange unit 14;

[0034] A tail gas input pipe 15 is provided on the reaction unit and / or the spray absorption unit 12; the heat exchange unit 14 has a refrigerant side and a medium side;

[0035] The circulation unit 13 is used to transport the absorption liquid in the reaction unit to the spray absorption unit 12 through the medium side of the heat exchange unit 14; the spray absorption unit 12 is provided with a tail gas output port 121;

[0036] A first control valve is provided on the refrigerant side; a temperature sensor is provided in the reaction unit; the tail gas input pipe 15 is also equipped with a flow sensor for detecting the sulfur dioxide tail gas;

[0037] The first control valve acts according to the signals of the temperature sensor and the flow sensor.

[0038] In a specific embodiment, the reaction unit can be arranged inside the spray absorption unit 12, and this way is similar to the structure of the traditional tail gas tower; in a preferred embodiment, the reaction unit is a reaction kettle 11 and the spray absorption unit 12 is connected to the gas outlet of the reaction kettle 11. In this way, the spray absorption unit 12 can be connected to reaction kettles 11 of different sizes, and the operator can choose to use a reaction kettle 11 with a larger capacity. Both ways can enable the absorption liquid to contact the sulfur dioxide tail gas in a spray manner, and the operator can adopt the first setting method or the second setting method according to the actual situation. And this embodiment is based on the characteristics of batch reaction and preferably selects the second setting method.

[0039] More preferably, the original stirring mechanism can be retained in the reaction kettle 11 to ensure the temperature uniformity of the absorption liquid and the product formed by the reaction of the absorption liquid and sulfur dioxide in the reaction kettle 11.

[0040] In this design, the operator adds the absorbent for absorbing the sulfur dioxide tail gas into the reactor 11. In this embodiment, the absorbent is caustic liquor with a concentration of 20% - 30%. As the sulfur dioxide tail gas enters the reactor 11 from the tail gas input pipe 15, the circulation unit 13 transports the caustic liquor in the reactor 11 to the spray absorption unit 12 through the medium side of the heat exchange unit 14, so that the caustic liquor contacts the sulfur dioxide tail gas in the form of small droplets and sodium sulfite is generated. Since the reaction between the sulfur dioxide tail gas and the caustic liquor is an exothermic reaction, the temperature of the mixed solution of sodium sulfite and caustic liquor in the reactor 11 will increase. The first control valve can control the opening degree according to the signals of the temperature sensor and the flow sensor, and control the temperature of the mixed solution of sodium sulfite and caustic liquor during the circulation process to prevent the water with the lowest boiling point from boiling in the reactor 11.

[0041] In the initial stage, the flow rate of the sulfur dioxide tail gas is small. Correspondingly, the reaction rate in the reactor 11 is relatively constant, and the temperature fluctuation in the reactor 11 is not significant. At this time, the main purpose is to absorb the sulfur dioxide tail gas. In order to ensure the absorption efficiency of the sulfur dioxide tail gas, the first control valve will control the opening degree according to the signal of the flow sensor, and the signal of the temperature sensor is used for auxiliary control. In the initial stage, the opening degree of the first control valve is 15% - 20%.

[0042] In the middle and late stages, during the process when the flow rate of the sulfur dioxide tail gas instantaneously increases to a relatively constant value, correspondingly, the reaction rate of the reactor 11 will increase, and the temperature of the reactor 11 will gradually rise, but the temperature sensor will not be triggered in a short time. At this time, the first control valve will gradually increase the opening degree according to the flow sensor, and control the opening degree of the first control valve to be 30% - 35%. At this time, the main purpose is still to absorb the sulfur dioxide tail gas; as the reaction progresses, the temperature of the reactor 11 rises sharply and triggers the temperature sensor. In order to prevent the phenomenon of boiling in the reactor 11, at this time, the main focus is on cooling, and the first control valve will control the opening degree according to the signal of the temperature sensor, and control the opening degree of the first control valve to be 40% - 50%.

[0043] In the final stage, the flow rate of the sulfur dioxide tail gas gradually decreases to a constant value. Correspondingly, the temperature in the reactor 11 will not decrease instantaneously. Therefore, the first control valve will first control the opening degree according to the signal of the temperature sensor, and keep the opening degree of the first control valve at 40% - 50% until the reaction rate of the reactor 11 continuously decreases and the temperature in the reactor 11 gradually drops. Then the first control valve will control the opening degree to decrease according to the signal of the flow sensor, and control the opening degree of the first control valve to be 15% - 20%.

[0044] More preferably, in order to achieve more precise control, a flow control module is further provided on the circulation unit 13; thus, in a preferred embodiment, the flow control module and the first control valve synchronously control the temperature in the reactor 11. The flow control module can be a frequency converter installed on the circulation unit 13 to control the power of the circulation unit 13 such as a pump, or it can be a control valve provided at the outlet position of the circulation unit 13.

[0045] Specifically, when the instantaneous flow rate of the sulfur dioxide tail gas is small, the opening degree of the flow control module is 40% - 50%; when the instantaneous flow rate of the sulfur dioxide tail gas is large, the flow control module acts according to the signal of the flow sensor, increasing the opening degree of the flow control module to 70% - 80%, increasing the flow rate of the spray absorption unit 12 to improve the absorption efficiency of the sulfur dioxide tail gas. At the same time, as the temperature of the reaction unit gradually increases, the first control valve also controls the increase of the opening degree according to the signal of the temperature sensor, and the opening degree of the flow control module will cooperate with the first control valve in a fully open state of 100% to improve the cooling efficiency of the mixed solution of sodium sulfite and liquid caustic soda.

[0046] In actual use, the liquid caustic soda in the reactor 11 will be continuously consumed as the reaction proceeds. In this embodiment, a pH sensor is further provided on the reactor 11. The pH sensor is linked with the second control valve 1111 on the liquid inlet pipe 111, and the opening degree of the second control valve 1111 is controlled through the signal of the pH sensor. The externally provided liquid caustic soda conveying device timely supplements the liquid caustic soda into the reactor 11 through the liquid inlet pipe 111; in a more preferred embodiment, the liquid inlet pipe 111 can be further divided into a water input end and a liquid caustic soda input end, and water is supplemented through the water input end or liquid caustic soda is supplemented through the liquid caustic soda input end according to the signal of the pH sensor, or water and liquid caustic soda can be supplemented simultaneously.

[0047] Optionally, the heat exchange unit 14 is one of a plate heat exchanger, a shell and tube heat exchanger, and an air heat exchanger. All three heat exchange units 14 can achieve cooling, and operators can select and use them according to the actual production situation. From the perspective of anti-corrosion, the plate heat exchanger is preferably used in this embodiment.

[0048] Further, after the reaction is completed, the operator can discharge the mixed solution of sodium sulfite and liquid caustic soda in the reactor 11 through the discharge pipe 16; in a preferred embodiment, the discharge pipe 16 can be provided on the circulation unit 13, and the discharge is completed through the cooperation of the circulation unit 13 and the valve on the discharge pipe 16; in other embodiments, the discharge pipe 16 can be provided on the reactor 11, and the discharge is completed through the cooperation of the reactor 11 and the valve.

[0049] Specifically, the circulation unit 13 includes a circulation pipeline 131 and a delivery pump 132 arranged on the circulation pipeline 131. One end of the circulation pipeline 131 is connected to the bottom of the reaction kettle 11, and the other end of the circulation pipeline 131 is connected to the spray absorption unit 12. The heat exchange unit 14 is arranged on the circulation pipeline 131, and the delivery pump 132 and the heat exchange unit 14 are arranged in sequence along the delivery direction of the circulation pipeline 131. Under the action of the delivery pump 132, the mixed solution of sodium sulfite and liquid caustic soda enters the circulation pipeline 131 from the bottom of the reaction kettle 11, is cooled by passing through the heat exchange unit 14, and then is delivered to the spray absorption unit 12. For the way the discharge pipe 16 is arranged in the circulation unit 13, the discharge pipe 16 can be connected between the delivery pump 132 and the heat exchange unit 14, and the discharge is completed by the delivery pump 132. More preferably, in this embodiment, the spray absorption unit 12 is a spray tower.

[0050] Embodiment 2

[0051] Reference Figure 2 , a sulfur dioxide tail gas treatment system, includes a first tail gas absorption device 2 and a second tail gas absorption device 3 connected in series; the first tail gas absorption device 2 is the sulfur dioxide tail gas absorption device 1 of Embodiment 1; the second tail gas absorption device 3 is used to absorb sulfur dioxide in the tail gas discharged from the tail gas outlet 121 of the first tail gas absorption device 2.

[0052] Under this design, the first tail gas absorption device 2 is mainly used to absorb sulfur dioxide and collect the generated sodium sulfite solution. However, during the absorption process, there will still be tail gas discharged from the tail gas outlet 121. By connecting the second tail gas absorption device 3 and the first tail gas absorption device 2 in series, under the action of the second tail gas absorption device 3, the sulfur dioxide in the tail gas discharged from the first tail gas absorption device 2 can be secondarily absorbed, ensuring the maximum sulfur dioxide absorption effect.

[0053] Specifically, in actual production, most of the sulfur dioxide tail gas will participate in the reaction in the first tail gas absorption device 2, and only a small amount of sulfur dioxide tail gas enters the second tail gas absorption device 3. Therefore, the second tail gas absorption device 3 is mainly used to ensure that the tail gas containing sulfur dioxide meets the emission standards.

[0054] In a preferred embodiment, the second tail gas absorption device 3 can adopt the sulfur dioxide tail gas absorption device of Embodiment 1. Therefore, the second tail gas absorption device 3 also has the control processes in the initial stage, middle and late stages, and final stage similar to those of the first tail gas absorption device 2 of Embodiment 1; in other embodiments, the second tail gas absorption device 3 can adopt one of an absorption tower, a washing tower, and a bed adsorption device.

[0055] The tail gas flow rate after being processed by the first tail gas absorption device 2 has significantly decreased. At this time, the requirement for the absorption capacity of the second tail gas absorption device 3 is relatively low. Therefore, any of the above implementation forms can be adopted.

[0056] From the perspective of facilitating the utilization and transformation of the existing equipment in the factory, it is preferably to adopt the sulfur dioxide tail gas absorption device of Embodiment 1. In this scenario, the connection relationship between the first tail gas absorption device 2 and the second tail gas absorption device 3 is as follows: the tail gas output port 121 of the first tail gas absorption device 2 is communicated with the tail gas input pipe 15 of the second tail gas absorption device 3; the tail gas input pipe 15 of the first tail gas absorption device 2 is connected to the external sulfur dioxide tail gas source; the tail gas output port 121 of the second tail gas absorption device 3 is connected to an external tail gas treatment device or the atmosphere.

[0057] Specifically, after being absorbed and processed by the first tail gas absorption device 2, the external sulfur dioxide tail gas source is output from the tail gas output port 121 of the first tail gas absorption device 2 and enters the second tail gas absorption device 3 through the tail gas input pipe 15 of the second tail gas absorption device 3 for secondary treatment. The tail gas after being secondary-treated by the second tail gas absorption device 3 can be introduced into an external tail gas treatment device for further reaction and recovery. In other embodiments, if the tail gas after being secondary-treated by the second tail gas absorption device 3 meets the emission standards, it can also be discharged into the atmosphere.

[0058] Furthermore, in a specific embodiment, the discharge pipe 16 is arranged on the reaction unit of the first tail gas absorption device 2 and the reaction unit of the second tail gas absorption device 3; in a preferred embodiment, the discharge pipe 16 is arranged on the circulation unit 13 of the first tail gas absorption device 2 and the circulation unit 13 of the second tail gas absorption device 3, and the discharging is completed by the delivery pump 132, with higher discharging efficiency.

[0059] More preferably, the discharge pipes 16 of the first tail gas absorption device 2 and the second tail gas absorption device 3 are communicated.

[0060] In actual use, the operator can separately control the output of the mixed solution of sodium sulfite solution and liquid alkali from the first tail gas absorption device 2 and the second tail gas absorption device 3, and can also synchronously output the mixed solution of sodium sulfite solution and liquid alkali from the first tail gas absorption device 2 and the mixed solution of sodium sulfite solution and liquid alkali from the second tail gas absorption device 3.

[0061] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A sulfur dioxide tail gas absorption device, characterized in that It includes a reaction unit, a spray absorption unit, a circulation unit, and a heat exchange unit; A tail gas input pipe is provided on the reaction unit and / or the spray absorption unit; the heat exchange unit has a refrigerant side and a medium side; The circulation unit is used to transport the absorption liquid in the reaction unit to the spray absorption unit through the medium side of the heat exchange unit; the spray absorption unit is provided with a tail gas output port; A first control valve is provided on the refrigerant side; a temperature sensor is provided in the reaction unit; the tail gas input pipe is also equipped with a flow sensor for detecting the flow rate of sulfur dioxide tail gas; The first control valve operates according to the signals of the temperature sensor and the flow sensor.

2. The sulfur dioxide tail gas absorption device according to claim 1, characterized in that The heat exchange unit is one of a plate heat exchanger, a shell-and-tube heat exchanger, and an air heat exchanger.

3. The sulfur dioxide tail gas absorption device according to claim 1, wherein The reaction unit is arranged inside the spray absorption unit, or the reaction unit is a reaction kettle and the spray absorption unit is connected to the gas outlet of the reaction kettle.

4. The sulfur dioxide tail gas absorption device according to claim 1, wherein The circulation unit is provided with a flow control module; the flow control module is used to control the circulation flow rate of the circulation unit; the flow control module operates according to the signals of the flow sensor and / or the temperature sensor.

5. The sulfur dioxide tail gas absorption device according to claim 1, characterized in that A pH sensor is also provided on the reaction unit. The reaction unit is provided with a liquid inlet pipe, which is communicated with an external absorption liquid conveying device. A second control valve is provided on the liquid inlet pipe, and the second control valve operates according to the signal of the pH sensor.

6. The sulfur dioxide tail gas absorption device according to claim 1, wherein, An outlet pipe for discharging the absorption liquid in the reaction unit and the product after the reaction of the absorption liquid with sulfur dioxide is provided on the reaction unit or the circulation unit, and a valve is provided on the outlet pipe.

7. The sulfur dioxide tail gas absorption device according to claim 6, characterized in that, The circulation unit includes a circulation pipeline and a delivery pump arranged on the circulation pipeline. One end of the circulation pipeline is connected to the bottom of the reaction unit, and the other end of the circulation pipeline is connected to the spray absorption unit. The heat exchange unit is arranged on the circulation pipeline, and the delivery pump and the heat exchange unit are arranged in sequence along the conveying direction of the circulation pipeline. The outlet pipe is connected between the delivery pump and the heat exchange unit.

8. A sulfur dioxide tail gas treatment system, characterized in that, It includes a first tail gas absorption device and a second tail gas absorption device connected in series; the first tail gas absorption device is the sulfur dioxide tail gas absorption device according to any one of claims 1 to 7; the second tail gas absorption device is used to absorb sulfur dioxide in the tail gas discharged from the tail gas output port of the first tail gas absorption device.

9. The sulfur dioxide tail gas treatment system according to claim 8, wherein, The second tail gas absorption device is an absorption tower, a scrubbing tower, a bed adsorption device, or the sulfur dioxide tail gas absorption device according to any one of claims 1 to 7; If the second tail gas absorption device is the sulfur dioxide tail gas absorption device, the tail gas output port of the first tail gas absorption device is communicated with the tail gas input pipe of the second tail gas absorption device; the tail gas input pipe of the first tail gas absorption device is connected to an external sulfur dioxide tail gas source; the tail gas output port of the second tail gas absorption device is connected to an external tail gas treatment device or the atmosphere.

10. The sulfur dioxide tail gas treatment system according to claim 8, wherein, If the second tail gas absorption device is the sulfur dioxide tail gas absorption device, a discharge pipe is provided on the reaction unit of the first tail gas absorption device and the reaction unit of the second tail gas absorption device, or a discharge pipe is provided on the circulation unit of the first tail gas absorption device and the circulation unit of the second tail gas absorption device; The discharge pipes of the first tail gas absorption device and the second tail gas absorption device are connected.

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