Desulfurization absorption system and flue gas desulfurization method

Abstract

The present invention discloses a desulfurization absorption system and a flue gas desulfurization method, the desulfurization absorption system comprises: a desulfurization tower body, the desulfurization tower body is provided with a flue gas inlet and a flue gas outlet, and the bottom of the desulfurization tower body is provided with a slurry pool for collecting a reacted spray liquid; the multiple first spraying mechanisms are arranged at intervals in the height direction of the desulfurization tower body; the second spraying mechanism is arranged between the first spraying mechanism and the slurry pond, or the second spraying mechanism is arranged between two adjacent first spraying mechanisms, and the second spraying mechanism comprises a first spraying mechanism and a second spraying mechanism; the second spraying pipe extends in the circumferential direction of the desulfurizing tower body to form a ring shape, one end of each second spraying nozzle is fixed to the second spraying pipe, the other end of each second spraying nozzle extends towards the inner wall of the desulfurizing tower body, and an included angle is formed between the other end of each second spraying nozzle and the inner wall of the desulfurizing tower body. According to the desulfurization absorption system, the marginal effect of the desulfurization tower body can be reduced, and the desulfurization effect is improved.

Description

Technical Field

[0001] This invention relates to the field of flue gas desulfurization technology, and in particular to a desulfurization absorption system and a flue gas desulfurization method. Background Technology

[0002] In the field of desulfurization in coal-fired power plants, the limestone-gypsum method has become the mainstream process due to its mature technology and high desulfurization efficiency. As the core equipment of the limestone-gypsum method, the desulfurization tower's internal gas-liquid mass transfer efficiency directly determines the SO2 removal effect. However, in actual operation, the desulfurization tower exhibits a significant "marginal effect": due to the uneven distribution of the flue gas flow field (high flow velocity at the center and low flow velocity near the wall) and the influence of blind spots in the spray coverage, insufficient gas-liquid contact often occurs in the "marginal areas" such as near the tower wall and the edge of the spray layer. The short residence time of flue gas in the marginal areas and the low slurry coverage result in incomplete SO2 absorption, forming local troughs in desulfurization efficiency. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a desulfurization absorption system that can further improve the coverage of the spray liquid, reduce the marginal effect of the desulfurization tower, and thus improve the desulfurization effect and efficiency.

[0004] This invention also proposes a flue gas desulfurization method.

[0005] According to a first aspect of the present invention, a desulfurization absorption system includes: a desulfurization tower body, wherein an inlet and an outlet are provided on the desulfurization tower body, and a slurry pool for collecting spray liquid after reaction is provided at the bottom of the desulfurization tower body; at least one first spraying mechanism, and a plurality of first spraying mechanisms are arranged at intervals along the height direction of the desulfurization tower body, each first spraying mechanism including: a first spray pipe and a plurality of first nozzles, wherein the first spray pipe extends in a ring around the circumference of the desulfurization tower body, and the plurality of first nozzles are arranged at intervals on the first spray pipe, the plurality of first nozzles being arranged along the axis of the first spray pipe. The line extends or extends obliquely toward the first spray pipe; the second spray mechanism is arranged between the first spray mechanism and the slurry tank, or the second spray mechanism is arranged between two adjacent first spray mechanisms, the second spray mechanism includes; a second spray pipe and a plurality of second nozzles arranged at intervals on the spray pipe, the second spray pipe extends circumferentially around the desulfurization tower body in a ring shape, one end of the plurality of second nozzles is fixed to the second spray pipe, and the other end extends toward the inner wall of the desulfurization tower body and is set at an angle to the inner wall of the desulfurization tower body.

[0006] According to the desulfurization absorption system of the present invention, by setting a second spraying mechanism, the coverage of the spraying liquid can be further improved, the marginal effect of the desulfurization tower can be reduced, and thus the desulfurization effect and desulfurization efficiency can be improved.

[0007] According to some embodiments of the present invention, the included angle between the second nozzle and the inner wall of the desulfurization tower body is greater than 0° and less than or equal to 60°.

[0008] According to some embodiments of the present invention, the desulfurization absorption system further includes: a circulation tank connected to the slurry tank, the circulation tank having an outlet; a circulation water pump having an inlet and an outlet, the inlet being connected to the outlet, the outlet being connected to the second spray pipe, the circulation water pump being used to pump spray liquid to the second spray pipe.

[0009] According to some embodiments of the present invention, the desulfurization absorption system further includes: an adjustment device arranged in the circulation tank for adjusting the pH value of the liquid in the circulation tank, wherein the pH value is greater than 5.5.

[0010] According to some embodiments of the present invention, the regulating device includes: a solution tank having a receiving cavity for storing an alkaline solution; a metering pump connected between the solution tank and the circulation tank for delivering the alkaline solution to the circulation tank; and a pH meter disposed below the circulation tank for monitoring the pH value of the liquid in the circulation tank, the pH meter being communicatively connected to the metering pump.

[0011] According to some embodiments of the present invention, the desulfurization absorption system further includes: an agitator fixed on the circulation tank to drive the flow of the sprayed liquid in the circulation tank.

[0012] According to some embodiments of the present invention, the desulfurization absorption system further includes: a sedimentation tank connected to the slurry tank for solid-liquid separation of the effluent in the slurry tank to obtain precipitate and upper liquid; and a transfer pump connected between the sedimentation tank and the circulation tank for transferring the upper liquid to the circulation tank.

[0013] According to some embodiments of the present invention, the desulfurization absorption system further includes: a conveyor and a dewatering machine, one end of the conveyor being connected to the sedimentation tank and the other end being connected to the dewatering machine, for transferring the precipitate in the sedimentation tank to the dewatering machine; the dewatering machine is used to dewater the precipitate.

[0014] According to a second aspect of the present invention, the flue gas desulfurization method is used in accordance with the desulfurization absorption system described in the first aspect. The flue gas desulfurization method includes: step S1, flue gas enters the desulfurization tower body through the flue gas inlet, undergoes desulfurization through the first spray mechanism, and the spray liquid after the reaction is completed enters the slurry tank; step S2, the spray liquid after the reaction in the slurry tank is transferred to a sedimentation tank for sedimentation treatment to obtain precipitate and upper liquid; step S3, the upper liquid is transferred to a circulation tank, and the precipitate is transferred to a dewatering machine; step S4, the pH value of the liquid in the circulation tank is adjusted to a preset value by an adjusting device; step S5, the liquid is transferred to a second spray pipe by a circulating water pump, and then sprayed into the desulfurization tower body through a second nozzle.

[0015] The flue gas desulfurization method of the present invention can improve desulfurization efficiency while reducing the use of external spraying liquid, thereby improving resource utilization and reducing desulfurization costs.

[0016] According to some embodiments of the present invention, step S4 includes: step S41, measuring the pH value of the liquid in the circulation tank; step S42, confirming that the pH value is lower than a first preset value; step S43, adding an alkaline solution to the circulation tank through a metering pump to adjust the pH value of the liquid in the circulation tank to the preset value.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a connection diagram of a desulfurization absorption system according to an embodiment of the present invention; Figure 2 This is a connection diagram of a desulfurization absorption system according to another embodiment of the present invention; Figure 3 This is a schematic diagram of the second spray pipe according to an embodiment of the present invention; Figure 4 This is a schematic flowchart of a flue gas desulfurization method according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the process for adjusting the pH value according to an embodiment of the present invention.

[0019] Figure label: 100. Desulfurization absorption system; 10. Desulfurization tower body; 11. Flue gas outlet; 12. Slurry tank; 20. First spraying mechanism; 30. Second spraying mechanism; 31. Second spraying pipe; 32. Second nozzle; 40. Circulating tank; 50. Circulating water pump; 60. Sedimentation tank; 70. Transfer pump; 80. Conveyor; 90. Dewatering machine. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] The following is for reference. Figures 1-3 A desulfurization absorption system 100 according to an embodiment of the first aspect of the present invention is described.

[0022] like Figures 1-3 As shown, the desulfurization absorption system 100 according to an embodiment of the present invention includes: a desulfurization tower body 10, at least one first spraying mechanism 20 and a second spraying mechanism 30.

[0023] Specifically, the desulfurization tower body 10 is provided with a flue gas inlet and a flue gas outlet 11, and a slurry pool 12 is provided at the bottom of the desulfurization tower body 10 for collecting the sprayed liquid after the reaction. The flue gas inlet is mainly used for the inflow of flue gas; the flue gas outlet 11 is mainly used for the discharge of desulfurized flue gas. It should be noted that, under normal circumstances, the flue gas inlet is located on the side wall of the desulfurization tower body 10, and the flue gas outlet 11 is located at the upper end of the desulfurization tower body 10. This is beneficial to the layout of the desulfurization tower body 10.

[0024] Multiple first spraying mechanisms 20 are arranged at intervals along the height direction of the desulfurization tower body 10. Each first spraying mechanism 20 includes a first spraying pipe and multiple first nozzles. The first spraying pipe extends in a ring around the circumference of the desulfurization tower body 10. Multiple first nozzles are arranged at intervals on the first spraying pipe. The multiple first nozzles extend along the axis of the first spraying pipe or extend obliquely toward the first spraying pipe.

[0025] It should be noted that the height direction of the desulfurization tower body 10 is the up-down direction, and the axial direction of the first spray pipe is the same as the height direction of the desulfurization tower body 10.

[0026] It is understood that in some embodiments, the direction of the multiple first nozzles can be up and down, that is, the flow direction of the sprayed liquid can be up and down; in other embodiments, the multiple first nozzles can be arranged facing each other, that is, the water flow from the multiple first nozzles can cross each other, which can further ensure the coverage of the sprayed area.

[0027] The second spraying mechanism 30 is arranged between the first spraying mechanism 20 and the slurry tank 12, or the second spraying mechanism 30 is arranged between two adjacent first spraying mechanisms 20. Specifically, when there is one first spraying mechanism 20, the second spraying mechanism 30 is arranged between the first spraying mechanism 20 and the slurry tank 12; when there are multiple first spraying mechanisms 20, the second spraying mechanism 30 is arranged between two adjacent first spraying mechanisms 20, for example... Figure 2 As shown, the desulfurization absorption system 100 is a single-tower dual-circulation desulfurization system, which includes two first spray mechanisms 20 and a second spray mechanism 30 arranged between the two first spray mechanisms 20.

[0028] The second spraying mechanism 30 includes a second spray pipe 31 and a plurality of second nozzles 32 spaced apart on the spray pipe. The second spray pipe 31 extends in a ring around the circumference of the desulfurization tower body 10. One end of the plurality of second nozzles 32 is fixed to the second spray pipe 31, and the other end extends toward the inner wall of the desulfurization tower body 10 and is set at an angle to the inner wall of the desulfurization tower body 10.

[0029] Specifically, multiple second nozzles 32 extend toward the inner wall of the desulfurization tower 10, so that the water flow sprayed through the second nozzles 32 can be sprayed toward the desulfurization tower 10. This allows the airflow sprayed from the second nozzles 32 to cover the area between the desulfurization tower wall and the first spraying mechanism 20, thereby eliminating the spray dead zone between the first spraying mechanism 20 and the tower wall and improving the desulfurization effect. At the same time, it also ensures that the spray liquid sprayed through the nozzles can be sprayed onto the tower wall, thereby eliminating the marginal effect of the desulfurization tower 10 and further improving the desulfurization effect.

[0030] According to the desulfurization absorption system 100 of the present invention, by setting a second spraying mechanism 30, the coverage of the spraying liquid can be further improved, the marginal effect of the desulfurization tower 10 can be reduced, and thus the desulfurization effect and desulfurization efficiency can be improved.

[0031] According to some embodiments of the present invention, the included angle between the second nozzle 32 and the inner wall of the desulfurization tower body 10 is greater than 0° and less than or equal to 60°. For example, the included angle between the nozzle and the inner wall of the desulfurization tower body 10 can be 10°, 20°, 30°, 40°, 50° or 60°. This ensures that the spraying area of ​​the second spraying mechanism 30 can cover the area between the desulfurization tower wall and the first spraying mechanism 20 that cannot be sprayed, thereby eliminating the spraying dead angle between the first spraying mechanism 20 and the tower wall, thus improving the desulfurization effect. At the same time, it also ensures that the spray liquid sprayed through the nozzle can be sprayed onto the tower wall, thereby achieving the purpose of eliminating the marginal effect of the desulfurization tower body 10.

[0032] According to some embodiments of the present invention, such as Figures 1-2As shown, the desulfurization absorption system 100 also includes a circulation tank 40 and a circulating water pump 50. The circulation tank 40 is connected to the slurry tank 12, and an outlet is formed on the circulation tank 40. The circulating water pump 50 has an inlet and an outlet, with the inlet connected to the outlet and the outlet connected to the second spray pipe 31. The circulating water pump 50 is used to pump spray liquid into the second spray pipe 31. Specifically, the spray liquid after participating in the reaction can flow from the slurry tank 12 to the circulation tank 40 for storage, while the circulating water pump 50 can pump the spray liquid after participating in the reaction to the second spray pipe 31, so that it can re-participate in the flue gas desulfurization reaction. In this way, resource recovery and utilization can be improved, and the processing cost of the entire device can be reduced.

[0033] According to some embodiments of the present invention, the desulfurization absorption system 100 further includes: an adjusting device arranged in the circulation tank 40, used to adjust the pH value of the liquid in the circulation tank 40, wherein the pH value is greater than 5.5. In this way, the pH value of the spray liquid re-entering the desulfurization tower 10 can reach the required value, thereby ensuring that the spray liquid entering the desulfurization tower 10 can participate in desulfurization.

[0034] For example, the pH value can be 5.6, 5.7, 5.8 and above.

[0035] According to some embodiments of the present invention, the regulating device includes: a solution tank, a metering pump, and a pH meter. The solution tank has a receiving cavity for storing an alkaline solution. The metering pump is connected between the solution tank and a circulation tank 40 for delivering the alkaline solution into the circulation tank 40. The pH meter is located below the circulation tank 40 for monitoring the pH value of the liquid in the circulation tank 40. The pH meter is communicatively connected to the metering pump. The metering pump has a metering function; therefore, by delivering the alkaline solution to the circulation tank 40 via the metering pump, the accuracy of the pH value can be further improved. Furthermore, the communicative connection between the pH meter and the metering pump allows the metering pump to selectively start and stop based on the real-time pH, thereby improving the automation of the entire device.

[0036] Optionally, the alkaline solution in this application is a calcium hydroxide solution. This avoids introducing excess aqueous solution, thus preventing disruption of the water balance of the desulfurization tower 10, and also avoids the addition of other alkaline substances that could affect the quality of the desulfurization gypsum. Furthermore, since calcium hydroxide has high solubility, it avoids corrosion and scaling of the desulfurization tower 10 wall that could be caused by directly spraying with calcium carbonate solution.

[0037] According to some embodiments of the present invention, the desulfurization absorption system 100 further includes a stirrer fixed to the circulation tank 40 to drive the liquid flow within the circulation tank 40. This facilitates the improvement of the mixing uniformity between the alkaline solution and the liquid within the circulation tank 40, thereby improving the accuracy of the pH value.

[0038] It should be noted that the agitator can be located above the circulation tank 40 or on the side of the circulation tank 40; there are no restrictions here.

[0039] According to some embodiments of the present invention, such as Figures 1-2 As shown, the desulfurization absorption system 100 also includes a sedimentation tank 60 and a transfer pump 70. The sedimentation tank 60 is connected to the slurry tank 12 and is used to perform solid-liquid separation on the effluent from the slurry tank 12 to obtain precipitate and supernatant liquid. The transfer pump 70 is connected between the sedimentation tank 60 and the circulation tank 40 and is used to transfer the supernatant liquid to the circulation tank 40. Specifically, the sedimentation tank 60 can achieve the recycling of different resources through solid-liquid separation. For example, the transfer pump 70 can be used to transfer the supernatant liquid to the circulation tank 40, and then it can participate in the desulfurization of flue gas again. The precipitate can be transferred out to make gypsum.

[0040] According to some embodiments of the present invention, such as Figures 1-2 As shown, the desulfurization absorption system 100 also includes a conveyor 80 and a dewatering machine 90. One end of the conveyor 80 is connected to the sedimentation tank 60, and the other end is connected to the dewatering machine 90, used to transfer the sediment in the sedimentation tank 60 to the dewatering machine 90; the dewatering machine 90 is used to dewater the sediment. Specifically, the conveyor 80 mainly plays a transfer role, and the dewatering machine 90 is used to dewater the sediment to obtain desulfurized gypsum, thereby realizing resource recycling.

[0041] Optionally, the desulfurization absorption system 100 also includes multiple valves and control devices. The multiple valves are respectively arranged at the inlet and outlet of the slurry tank 12, the sedimentation tank 60, and the circulation tank 40, and the multiple valves are electrically connected to the control devices. This facilitates the maintenance of the desulfurization absorption system 100.

[0042] According to the flue gas desulfurization method of the second aspect of the present invention, such as Figure 4 As shown, the flue gas desulfurization method is used in the desulfurization absorption system 100 according to the first aspect embodiment. The flue gas desulfurization method includes: step S1, flue gas enters the desulfurization tower 10 through the flue gas inlet, and is desulfurized by the first spray mechanism 20. After the reaction is completed, the spray liquid enters the slurry tank 12; step S2, the spray liquid after the reaction in the slurry tank 12 is transferred to the sedimentation tank 60 for sedimentation treatment to obtain precipitate and upper liquid; step S3, the upper liquid is transferred to the circulation tank 40, and the precipitate is transferred to the dewatering machine 90; step S4, the pH value of the liquid in the circulation tank 40 is adjusted to a preset value by the adjusting device; step S5, the liquid is transferred to the second spray pipe 31 by the circulating water pump 50, and then sprayed into the desulfurization tower 10 through the second nozzle 32.

[0043] Specifically, when desulfurizing flue gas, the flue gas enters the desulfurization tower 10 through the inlet and is then treated by the first spray mechanism 20. At the same time, the sprayed liquid comes into contact with the flue gas to achieve desulfurization. The treated sprayed liquid falls into the slurry pool and then flows into the sedimentation tank 60 for sedimentation. The supernatant after sedimentation is transferred to the circulation tank 40 by the transfer pump 70 for pH value testing. When the pH value is less than or equal to 5.5, the metering pump is turned on to add alkaline solution to the circulation tank 40 to make the pH value of the liquid in the circulation tank 40 reach 10. Then, it is transported to the second spray pipe 31 by the circulating water pump 50 and then sprayed onto the desulfurization tower wall through the second nozzle 32, thereby increasing the spray area in the desulfurization tower 10 and improving the desulfurization effect.

[0044] The flue gas desulfurization method of the present invention can improve desulfurization efficiency while reducing the use of external spraying liquid, thereby improving resource utilization and reducing desulfurization costs.

[0045] According to some embodiments of the present invention, such as Figure 5 As shown, step S4 includes: step S41, measuring the pH value of the liquid in the circulation tank 40; step S42, confirming that the pH value is lower than the first preset value; step S43, adding an alkaline solution to the circulation tank 40 through a metering pump to adjust the pH value of the liquid in the circulation tank 40 to the preset value.

[0046] For example, the first preset value is 5.5, the second preset value is 10, and the alkaline solution is calcium hydroxide solution. Specifically, the pH value in the circulation tank 40 is first measured using a pH meter. If the pH is less than 5.5, calcium hydroxide solution is added to the circulation tank 40 to adjust the pH value of the liquid in the circulation tank 40 to 10. If the pH is greater than 5.5, no adjustment is needed, and the solution can be used directly. This further reduces resource waste and thus lowers operating costs.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A desulfurization absorption system (100), characterized in that, include: The desulfurization tower body (10) is provided with a flue gas inlet and a flue gas outlet (11), and the bottom of the desulfurization tower body (10) is provided with a slurry pool (12) for collecting the sprayed liquid after the reaction. At least one first spray mechanism (20), and a plurality of first spray mechanisms (20) are arranged at intervals along the height direction of the desulfurization tower body (10). The first spray mechanism (20) includes: a first spray pipe and a plurality of first nozzles. The first spray pipe extends in a ring around the circumference of the desulfurization tower body (10). The plurality of first nozzles are arranged at intervals on the first spray pipe. The plurality of first nozzles extend along the axis of the first spray pipe or extend obliquely toward the first spray pipe. The second spraying mechanism (30) is arranged between the first spraying mechanism (20) and the slurry tank (12), or the second spraying mechanism (30) is arranged between two adjacent first spraying mechanisms (20). The second spraying mechanism (30) includes a second spraying pipe (31) and a plurality of second nozzles (32) spaced apart on the spraying pipe. The second spraying pipe (31) extends in a ring around the circumference of the desulfurization tower body (10). One end of the plurality of second nozzles (32) is fixed to the second spraying pipe (31), and the other end extends toward the inner wall of the desulfurization tower body (10) and is set at an angle to the inner wall of the desulfurization tower body (10).

2. The desulfurization absorption system (100) according to claim 1, characterized in that, The angle between the second nozzle (32) and the inner wall of the desulfurization tower body (10) is greater than 0° and less than or equal to 60°.

3. The desulfurization absorption system (100) according to claim 1, characterized in that, Also includes: A circulation tank (40) is connected to the slurry tank (12), and an outlet is formed on the circulation tank (40); A circulating water pump (50) has an inlet and an outlet. The inlet is connected to the outlet and the outlet is connected to the second spray pipe (31). The circulating water pump (50) is used to pump spray liquid into the second spray pipe (31).

4. The desulfurization absorption system (100) according to claim 3, characterized in that, Also includes: A regulating device is arranged in the circulation tank (40) for regulating the pH value of the liquid in the circulation tank (40), wherein the pH value is greater than 5.

5.

5. The desulfurization absorption system (100) according to claim 4, characterized in that, The regulating device includes: A solution tank having a receiving cavity for storing alkaline solutions; A metering pump is connected between the solution tank and the circulation pool (40) for delivering the alkaline solution into the circulation pool (40); A pH meter is installed below the circulation tank (40) to monitor the pH value of the liquid in the circulation tank (40). The pH meter is communicatively connected to the metering pump.

6. The desulfurization absorption system (100) according to claim 4, characterized in that, Also includes: A stirrer is fixed on the circulation tank (40) to drive the flow of the liquid in the circulation tank (40).

7. The desulfurization absorption system (100) according to claim 3, characterized in that, Also includes: A sedimentation tank (60) is connected to the slurry tank (12) and is used to perform solid-liquid separation on the effluent in the slurry tank (12) to obtain precipitate and upper liquid. A transfer pump (70) is connected between the sedimentation tank (60) and the circulation tank (40) for transferring the upper liquid to the circulation tank (40).

8. The desulfurization absorption system (100) according to claim 7, characterized in that, Also includes: A conveyor (80) and a dewatering machine (90) are provided. One end of the conveyor (80) is connected to the sedimentation tank (60), and the other end is connected to the dewatering machine (90). The conveyor (80) is used to transfer the sediment in the sedimentation tank (60) to the dewatering machine (90). The dewatering machine (90) is used to dewater the sediment.

9. A flue gas desulfurization method, said flue gas desulfurization method being used in a desulfurization absorption system (100) according to any one of claims 1-8, characterized in that, The flue gas desulfurization method includes: Step S1: Flue gas enters the desulfurization tower body (10) through the flue gas inlet and is desulfurized by the first spray mechanism (20). The spray liquid after the reaction is completed enters the slurry tank (12). Step S2: The sprayed liquid after reaction in the slurry tank (12) is transferred to the sedimentation tank (60) for sedimentation treatment to obtain precipitate and upper liquid; Step S3: Transfer the liquid on the upper side to the circulation tank (40) and transfer the sediment to the dewatering machine (90); Step S4: Adjust the pH value of the liquid in the circulation tank (40) to a preset value using an adjustment device; In step S5, the liquid is transferred to the second spray pipe (31) by the circulating water pump (50), and then sprayed into the desulfurization tower body (10) through the nozzle.

10. The flue gas desulfurization method according to claim 9, characterized in that, Step S4 includes: Step S41: Measure the pH value of the liquid in the circulation tank (40); Step S42: Confirm that the pH value is lower than the first preset value; Step S43: An alkaline solution is added to the circulation tank (40) by a metering pump to adjust the pH value of the liquid in the circulation tank (40) to a preset value.

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