Multi-stage flue gas desulfurization spray tower

Abstract

The invention relates to the technical field of flue gas desulfurization equipment, and particularly discloses a multi-stage flue gas desulfurization spray tower which comprises a spray tower body, a cavity is formed in the spray tower body, a seventh mounting plate is slidably mounted at the bottom end in the cavity, a first mounting plate is slidably mounted at the position, above the seventh mounting plate, in the cavity, and a second mounting plate is slidably mounted at the position, above the seventh mounting plate, in the cavity. Third mounting plates are mounted on the two sides of the top end in the cavity, a filter screen is further mounted between the two third mounting plates, a second mounting plate and a seventh mounting plate are slidably mounted in the cavity and located between the first mounting plate and the two third mounting plates, and spraying mechanisms are mounted at the bottoms of the first mounting plate and the second mounting plate. By arranging the filler layer capable of being adjusted up and down, the space of each stage of purification can be adjusted according to needs, the capacity of each stage of purification can be adjusted according to needs, and finally the preset use requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas desulfurization equipment, and particularly relates to a multi-stage flue gas desulfurization spray tower. Background Art

[0002] The flue gas waste gas of thermal power plants seriously pollutes the environment, affects people's health and damages the ecological environment; therefore, it is necessary to treat the waste gas. At present, the main methods for dust removal and desulfurization of flue gas are to use a spray tower for desulfurization.

[0003] In the actual use process of the existing flue gas spray tower, due to the long-term operation of the spray tower, impurities are likely to precipitate and adhere to the inner wall of the spray tower, which is difficult to clean. The impurities themselves will corrode the spray tower itself, affecting the service life of the spray tower, and then affecting the overall desulfurization efficiency of the spray tower. Moreover, when the flue gas concentration per unit time is too high, the spray tower itself cannot ensure the desulfurization efficiency of high-concentration flue gas, and the purification ability cannot be adjusted. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies in the prior art and propose a multi-stage flue gas desulfurization spray tower.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A multi-stage flue gas desulfurization spray tower includes a spray tower body. A cavity is provided inside the spray tower body. A seventh mounting plate is slidably installed at the bottom end inside the cavity. A first mounting plate is slidably installed above the seventh mounting plate inside the cavity. Third mounting plates are installed on both sides of the top end inside the cavity. A filter screen is also installed between the two third mounting plates. A second mounting plate is slidably installed between the first mounting plate and the two third mounting plates inside the cavity. Spray mechanisms are installed at the bottoms of the seventh mounting plate, the first mounting plate and the second mounting plate. The spray mechanism includes a fifth mounting block and a first spray head. The top of the fifth mounting block is connected to the bottom of the corresponding first mounting plate and the second mounting plate. The first spray head is located on one side of the corresponding fifth mounting block.

[0006] Optionally, an air inlet is installed at the bottom end on one side of the outer wall of the spray tower body. The air inlet is communicated with the cavity. A plurality of third exhaust holes are provided at one end of the seventh mounting plate, the first mounting plate and the second mounting plate. The third exhaust holes on the seventh mounting plate, the first mounting plate and the second mounting plate are arranged in a staggered manner. A PH sensor is installed on one side of the upper end of the third exhaust holes. A first exhaust port is provided at the top of the spray tower body. The first exhaust port is communicated with the cavity.

[0007] Optionally, sliding grooves are provided on both sides of the inner wall of the spray tower body along the length direction. The seventh mounting plate, the first mounting plate, and the second mounting plate are all slidably mounted inside the spray tower body through the sliding grooves. A plurality of electric sliders are slidably mounted inside the sliding grooves. One end of the seventh mounting plate, the first mounting plate, and the second mounting plate is connected to the outer wall of one side of the corresponding electric slider.

[0008] Optionally, a plurality of first electric rotating rods are installed at the bottom of the seventh mounting plate, the first mounting plate, and the second mounting plate. The bottom of the first electric rotating rod is installed with a first electric telescopic rod. The bottom of the first electric telescopic rod is connected to the top of the corresponding fifth mounting block.

[0009] Optionally, second electric rotating rods are installed around the outer wall of the fifth mounting block. One end of the second electric rotating rod is installed with a sixth mounting block. One end of one side of the outer wall of the sixth mounting block is installed with a first spray head. The other end of one side of the outer wall of the sixth mounting block is installed with a second spray head. A third spray head is installed on one side of the outer wall of the sixth mounting block.

[0010] Optionally, fourth mounting blocks are installed on both sides of the top of the inner wall of the cavity. A plurality of first air outlets are provided on the outer wall of one side of the fourth mounting block. First cleaning plates are installed on one side of the top of the spray tower body corresponding to the fourth mounting blocks. A second cleaning plate is installed outside the first cleaning plate.

[0011] Optionally, a third electric telescopic rod is installed between the top of the inner wall of the cavity and the corresponding first cleaning plate. A fourth electric telescopic rod is installed between the first cleaning plate and the corresponding second cleaning plate. A third cleaning plate is installed above the filter screen at one end of the inner wall of the cavity. A fifth electric telescopic rod is installed between the third cleaning plate and the inner wall of the cavity.

[0012] Optionally, inclined panels are installed on the tops of the seventh mounting plate, the first mounting plate, and the second mounting plate. A plurality of grooves are provided on the top of the inclined panel. The bottom of the groove is inclined.

[0013] Optionally, two support rods are installed on the tops of the seventh mounting plate and the first mounting plate. Second packing layers are installed on the tops of the corresponding two support rods. A first packing layer is installed above the air inlet inside the cavity.

[0014] Optionally, first through grooves are provided at one end of the first mounting plate and the seventh mounting plate. A second through groove is provided at one end of the second mounting plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In this invention, by setting a packing layer that can be adjusted up and down, the purification space of each stage can be adjusted according to needs, so that the purification ability of each stage can be adjusted according to needs, and finally the preset use requirements can be achieved.

[0016] Moreover, the specially - configured spraying mechanism and multiple mounting plates can clean the interior of the spray tower, extend the service life of the spray tower, and improve the purification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 An isometric view of a multi - stage flue gas desulfurization spray tower proposed by the present invention; Figure 2 Another isometric view of a multi - stage flue gas desulfurization spray tower of the present invention from a different angle; Figure 3 For the present invention Figure 2 An enlarged schematic view of the details at position A in the present invention; Figure 4 A schematic structural view of the spraying mechanism in the present invention; Figure 5 A schematic structural view of the third electric telescopic rod and the first cleaning plate in the present invention; Figure 6 A schematic structural view of the fourth electric telescopic rod and the second cleaning plate in the present invention; Figure 7 A schematic structural view of the support rod and the second packing layer in the present invention; Figure 8 A schematic structural view of the first mounting plate and the first through - slot in the present invention; Figure 9 A schematic structural view of the seventh mounting plate and the first through - slot in the present invention; Figure 10 A schematic structural view of the second mounting plate and the second through - slot in the present invention.

[0018] In the figure: 1. Spray tower body; 2. First mounting plate; 3. Second mounting plate; 4. Third mounting plate; 5. Filter screen; 6. First exhaust port; 7. Seventh mounting plate; 8. Fourth mounting block; 9. Third exhaust hole; 11. PH sensor; 12. Fifth mounting block; 13. First air outlet; 14. First cleaning plate; 15. Second cleaning plate; 16. Third cleaning plate; 17. Inclined panel; 18. First through - slot; 19. Second through - slot; 21. First electric rotating rod; 22. First electric telescopic rod; 23. Second electric rotating rod; 24. Sixth mounting block; 25. First spray head; 26. Second spray head; 27. Third spray head; 28. Third electric telescopic rod; 29. Fourth electric telescopic rod; 30. Air inlet; 31. First packing layer; 32. Second packing layer; 33. Support rod; 34. Slide groove; 35. Electric slider. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Referring to Figures 1-10 , a multi-stage flue gas desulfurization spray tower includes a spray tower body 1. A cavity is formed inside the spray tower body 1. A seventh mounting plate 7 is slidably installed at the bottom end inside the cavity. A first mounting plate 2 is slidably installed above the seventh mounting plate 7 inside the cavity. Third mounting plates 4 are installed on both sides of the top end inside the cavity. A filter screen 5 is also installed between the two third mounting plates 4. A second mounting plate 3 is slidably installed between the first mounting plate 2 and the two third mounting plates 4 inside the cavity. Spray mechanisms are installed at the bottoms of the seventh mounting plate 7, the first mounting plate 2, and the second mounting plate 3. The spray mechanism includes a fifth mounting block 12 and a first spray head 25. The top of the fifth mounting block 12 is connected to the bottom of the corresponding first mounting plate 2 and the second mounting plate 3. The first spray head 25 is located on one side of the corresponding fifth mounting block 12.

[0021] As a technical optimization solution of the present invention, an air inlet 30 is installed at the bottom end on one side of the outer wall of the spray tower body 1. The air inlet 30 is communicated with the cavity. A plurality of third exhaust holes 9 are formed at one end of each of the seventh mounting plate 7, the first mounting plate 2, and the second mounting plate 3. The third exhaust holes 9 on the seventh mounting plate 7, the first mounting plate 2, and the second mounting plate 3 are arranged in a staggered manner. A PH sensor 11 is installed on one side of the upper end in the third exhaust hole 9. A first exhaust port 6 is formed at the top of the spray tower body 1. The first exhaust port 6 is communicated with the cavity. The staggered arrangement of the third exhaust holes 9 makes the gas flow direction curve-shaped, prolongs the purification residence time, and thus improves the purification efficiency.

[0022] As a technical optimization solution of the present invention, sliding grooves 34 are formed along the length direction on both sides of the inner wall of the spray tower body 1. The seventh mounting plate 7, the first mounting plate 2, and the second mounting plate 3 are all slidably installed inside the spray tower body 1 through the sliding grooves 34. A plurality of electric sliders 35 are slidably installed inside the sliding grooves 34. One end of the seventh mounting plate 7, the first mounting plate 2, and the second mounting plate 3 is connected to the outer wall of one side of the corresponding electric slider 35. The cooperation of the sliding grooves 34 and the electric sliders 35 can make the seventh mounting plate 7, the first mounting plate 2, and the second mounting plate 3 move up and down in the spray tower body 1 to adjust their positions, so as to adapt to different working requirements.

[0023] As a technical optimization solution of the present invention, a plurality of first electric rotating rods 21 are installed at the bottoms of the seventh mounting plate 7, the first mounting plate 2 and the second mounting plate 3. A first electric telescopic rod 22 is installed at the bottom of the first electric rotating rod 21. The bottom of the first electric telescopic rod 22 is connected to the top of the corresponding fifth mounting block 12.

[0024] As a technical optimization solution of the present invention, second electric rotating rods 23 are installed around the outer wall of the fifth mounting block 12. A sixth mounting block 24 is installed at one end of the second electric rotating rod 23. A first spray head 25 is installed at one end of one side of the outer wall of the sixth mounting block 24. A second spray head 26 is installed at the other end of one side of the outer wall of the sixth mounting block 24. A third spray head 27 is installed on one side of the outer wall of the sixth mounting block 24. The design of multiple spray heads can adjust the position and angle during actual use, which can not only increase the spraying range and make the purification more sufficient and efficient, but also clean the inside of the spray tower body 1.

[0025] As a technical optimization solution of the present invention, fourth mounting blocks 8 are installed on both sides of the top of the inner wall of the cavity. A plurality of first air outlets 13 are provided on the outer wall of one side of the fourth mounting block 8. First cleaning plates 14 are installed on one side of the corresponding fourth mounting block 8 at the top of the spray tower body 1. A second cleaning plate 15 is installed outside the first cleaning plate 14.

[0026] As a technical optimization solution of the present invention, a third electric telescopic rod 28 is installed between the top of the inner wall of the cavity and the corresponding first cleaning plate 14. A fourth electric telescopic rod 29 is installed between the first cleaning plate 14 and the corresponding second cleaning plate 15. A third cleaning plate 16 is installed above the filter screen 5 at one end of the inner wall of the cavity. A fifth electric telescopic rod is installed between the third cleaning plate 16 and the inner wall of the cavity. This enables the filter screen 5 to be cleaned and maintain high purification ability.

[0027] As a technical optimization solution of the present invention, inclined panels 17 are installed at the tops of the seventh mounting plate 7, the first mounting plate 2 and the second mounting plate 3. A plurality of grooves are provided at the top of the inclined panel 17, and the bottom of the groove is inclined. The grooves incline towards the first through groove 18 and the second through groove 19, so that the spraying liquid and impurities can flow downward through the first through groove 18 and the second through groove 19, and finally be stored in the liquid storage cavity at the bottom end of the spray tower body 1.

[0028] As a technical optimization solution of the present invention, two support rods 33 are installed on the tops of the seventh mounting plate 7 and the first mounting plate 2 respectively. The tops of the corresponding two support rods 33 are both installed with a second packing layer 32, and a first packing layer 31 is installed above the air inlet 30 inside the cavity. Both the first packing layer 31 and the second packing layer 32 are used in the prior art to enable the gas and the spraying liquid to be fully mixed and purified. And the support rods 33 support and fix the first packing layer 31 and the second packing layer 32, and can move up and down during operation.

[0029] As a technical optimization solution of the present invention, a first through groove 18 is provided at one end of the first mounting plate 2 and the seventh mounting plate 7, and a second through groove 19 is provided at one end of the second mounting plate 3.

[0030] When the present invention is in use, the whole device is placed at a predetermined use position and powered on. The spraying mechanism is connected to an externally preset liquid supply pipeline. The part of the liquid supply pipeline inside the tower body is arranged as a flexible hose so as not to affect the up and down movement of the spraying mechanism. When the flue gas needs to be treated, first, the flue gas to be treated is sucked into the air inlet 30 through an externally connected first pump, and then the flue gas enters the chamber from below the first packing layer 31 as shown in the attached Figure 1 figure. At this time, each spraying mechanism located at the bottom of the seventh mounting plate 7 is started, and the first spray head 25, the second spray head 26, and the third spray head 27 simultaneously spray out the spraying liquid (the spraying liquid is a liquid commonly used in existing desulfurization spray towers and will not be elaborated here). The flue gas to be treated is preliminarily treated, and the large particles in the flue gas are precipitated and retained in the cavity below the seventh mounting plate 7; and during the spraying process, the position of the fifth mounting block 12 can be adjusted downward through the corresponding first electric telescopic rod 22, and the adjacent fifth mounting block 12 can continue to move downward. The adjacent two fifth mounting blocks 12 are not in the same plane and are staggered, so that the spraying mechanism located below the first mounting plate 2 can have a larger spraying range, improve the spraying efficiency, and ensure that the flue gas can fully react with the sprayed spraying liquid.

[0031] When each spraying mechanism located below the seventh mounting plate 7 is spraying for desulfurization, the first electric rotating rod 21 is used to rotate each spraying mechanism, so that the spraying range of each spraying mechanism is changed, and thus the spraying purification is more sufficient and the efficiency is improved again.

[0032] After the gas to be purified is preliminarily purified on the seventh mounting plate 7, it passes through the third exhaust hole 9 at one end of the seventh mounting plate 7 and moves upward into the space above the seventh mounting plate 7. Subsequently, it is dispersed inside the second packing layer 32 above the seventh mounting plate 7. The spraying mechanism below the first mounting plate 2 sprays. The gas slowly passes through the gaps inside the second packing layer 32 and reacts fully with the spraying liquid. Then it passes through the third exhaust hole 9 at one end of the first mounting plate 2 and moves upward into the space above the first mounting plate 2, and passes through the inside of the second packing layer 32 above the first mounting plate 2 again and reacts with the spraying liquid. Finally, the gas after multi-stage purification passes through the third exhaust hole 9 at one end of the second mounting plate 3 and moves upward, and passes through the filter screen 5 and enters the first exhaust port 6 and then into the discharge pipe. During each stage of purification, the spraying mechanism can be adjusted in terms of position, angle and spraying amount according to the actual usage requirements, and the specific adjustment method is as shown above.

[0033] During the process of the gas flowing from bottom to top, when passing through the third exhaust hole 9, the PH sensor 11 inside the third exhaust hole 9 will detect the PH value of the gas and compare the detected data with the preset data in the background. Each stage of gas purification has corresponding purification standards. If the measured PH data does not meet the preset standards, it means that the previous stage of purification is not sufficient, and it is necessary to improve the purification ability of the previous stage and the purification ability of the stage to be purified, so as to make the gas purification reach the final preset standard. Taking the chamber between the first mounting plate 2 and the seventh mounting plate 7 as an example for the adjustment method of the purification ability.

[0034] When the gas enters the chamber between the first mounting plate 2 and the seventh mounting plate 7, after spray purification, it finally flows upward through the third exhaust hole 9 at the end of the first mounting plate 2. At this time, if the detected PH data does not meet the standard. At this time, the corresponding electric slider 35 is slidably adjusted inside the chute 34 to drive the first mounting plate 2 to move upward, so that the gas storage space between the first mounting plate 2 and the seventh mounting plate 7 becomes larger, and at the same time, the spraying efficiency of the spraying mechanisms below the first mounting plate 2 and the second mounting plate 3 is increased. The increase in the spraying efficiency makes the gas contact the spraying liquid more fully, thereby improving the purification efficiency. The increase in the gas storage space increases the residence time of the gas inside, so as to achieve the purpose of improving the purification ability, and finally realizes the adjustment of the purification ability of each stage to reach the preset purification standard.

[0035] At the same time, it can also be adjusted by adjusting the intake air volume at the air inlet 30. The intake air volume is reduced so that the gas meets the preset standard after purification. Since the sulfur content in the gas is different each time during purification, the purification capacity of each stage may need to be adjusted again. At this time, the height positions of the first mounting plate 2, the seventh mounting plate 7 and the second mounting plate 3 can be adjusted, and the intake air volume at the air inlet 30 and the spraying efficiency of the spraying mechanism can be adjusted together to meet the actual purification requirements and achieve the best purification efficiency.

[0036] Some precipitates formed after the sprayed liquid sprayed by the spraying mechanism is mixed with the gas to be purified fall into the first packing layer 31 and the second packing layer 32, and the other part falls into the grooves of the inclined plate 17 above the first mounting plate 2 and the seventh mounting plate 7. Since the grooves are inclined towards the first through groove 18, the precipitates are mixed with the sprayed liquid and enter the first through groove 18 from the grooves and fall downward, and finally fall on the first packing layer 31 and the second packing layer 32.

[0037] When the purified gas moves to the chamber above the second mounting plate 3, the gas has been purified many times at this time and the corresponding PH value is qualified. At this time, the gas is finally filtered by the filter screen 5, and the gas finally enters the exhaust pipe through the first exhaust port 6. If the PH value detected by the third exhaust hole 9 on the second mounting plate 3 still does not meet the standard, the purification capacity of the entire device needs to be adjusted. The specific adjustment method has been elaborated in detail above to ensure that the finally discharged gas meets the preset requirements.

[0038] During the spraying process of the spraying mechanism, since the second inclined surfaces are provided on both the top and one side of the bottom of the sixth mounting block 24, the first spray head 25 can spray obliquely downward, and the third spray head 27 can spray from another angle, and the spraying is carried out synchronously from multiple angles to improve the spraying efficiency.

[0039] After the spray tower has been used for a period of time, in order to maintain its efficient purification ability, it is necessary to clean the inner wall of the spray tower body 1 and the spray mechanism. During cleaning, the air inlet 30 stops admitting air. The second electric telescopic rod between the second electric rotating rod 23 and the corresponding sixth mounting block 24 adjusts the position of the corresponding sixth mounting block 24, so that the corresponding sixth mounting block 24 can move outwards a certain distance until it adheres to an adjacent spray mechanism. At this time, the spray mechanisms can clean each other, which can prevent the first nozzle 25 and the third nozzle 27 from being blocked during actual use, thus ensuring the spray effect. In addition, by rotating the corresponding sixth mounting block 24 through the corresponding second electric rotating rod 23, the corresponding second nozzle 26 is moved to one side of the fifth mounting block 12, so that the second nozzle 26 can spray and clean towards one side of the fifth mounting block 12, preventing sediment from remaining on the outer wall of the fifth mounting block 12 after the spray mechanism has been spraying for a long time during actual use. During the cleaning process, the spray mechanism can be connected to a preset cleaning liquid pipeline to spray out the cleaning liquid.

[0040] In order to prevent the inner wall of the spray tower body 1 from adhering to sediment and avoid the sediment corroding the inner wall of the spray tower body 1 and affecting the service life of the spray tower body 1, the corresponding second electric telescopic rod can be adjusted so that each sixth mounting block 24 on the side close to the inner wall of the spray tower body 1 adheres to the inner wall of the spray tower body 1 as much as possible. After sequential adjustment, the spray tower body 1 is cleaned by spraying through the corresponding first nozzle 25 and the third nozzle 27. At this time, the first nozzle 25 and the third nozzle 27 are started, and the inner wall of the spray tower body 1 is cleaned by the first nozzle 25 and the third nozzle 27, and the corresponding cleaning liquid is sprayed to remove the sediment, ensuring the desulfurization efficiency while extending the overall service life of the device. In addition, by sliding the corresponding electric slider 35 inside the chute 34 and then adjusting the positions of the seventh mounting plate 7, the first mounting plate 2, and the second mounting plate 3, the outer walls of the seventh mounting plate 7, the first mounting plate 2, and the second mounting plate 3 are used to scrape and clean the inner wall of the spray tower body 1, improving the cleaning efficiency and cleaning ability of the inner wall of the spray tower body 1.

[0041] In addition, during the actual use process, in order to prevent excessive impurities from adhering to the filter screen 5 during its long-term operation, and when the volume of the spray tower body 1 is too large and it is not easy to replace the filter screen 5, the filter screen 5 can be blown and cleaned by each first air outlet 13, and the impurities can be blown and dropped from the surface of the filter screen 5 as much as possible. After using for a period of time, the corresponding third electric telescopic rod 28 can be extended outward so that the first cleaning plate 14 can be pushed and cleaned along the inclined surface of the fourth mounting block 8 to prevent precipitation from adhering to the outer wall of the fourth mounting block 8. During the process of the first cleaning plate 14 pushing and cleaning the corresponding fourth mounting block 8, the second cleaning plate 15 assists the first cleaning plate 14 in cleaning, and at the same time can also assist the first air outlet 13 in cleaning the filter screen 5. The third cleaning plate 16 is pushed outward by the fifth electric telescopic rod, and the third cleaning plate 16 pushes the impurities on the surface of the filter screen 5 to one side of the surface of the filter screen 5, which can ensure the filtering efficiency of the filter screen 5, and thus ensure the overall purification efficiency of the device without frequently replacing the filter screen 5. And there is a gap for dropping impurities between the side of the filter screen 5 far from the fifth electric telescopic rod and the inner wall of the spray tower body 1. Therefore, the impurities pushed and dropped by the third cleaning plate 16 finally fall downward above the second mounting plate 3.

[0042] Considering the sufficiency and accuracy of purification, a sealing layer is provided on the outer wall of the electric slider 35, and it is difficult for gas to leak between the electric slider 35 and the chute 34. And the outer walls of the seventh mounting plate 7, the first mounting plate 2, and the second mounting plate 3 are in close contact with the inner wall of the spray tower body 1, and the sealing performance is good. The gas discharged through the first exhaust port 6 is then subjected to gas-liquid separation by a gas-liquid separation device connected to the exhaust pipe to complete the final purification treatment work.

[0043] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A multi-stage flue gas desulfurization spray tower, characterized in that, It includes a spray tower body (1). A cavity is formed inside the spray tower body (1). A seventh mounting plate (7) is slidably installed at the bottom end inside the cavity. A first mounting plate (2) is slidably installed above the seventh mounting plate (7) inside the cavity. Third mounting plates (4) are installed on both sides of the top end inside the cavity. A filter screen (5) is also installed between the two third mounting plates (4). A second mounting plate (3) is slidably installed between the first mounting plate (2) and the two third mounting plates (4) inside the cavity. Spray mechanisms are installed at the bottoms of the seventh mounting plate (7), the first mounting plate (2), and the second mounting plate (3). The spray mechanism includes a fifth mounting block (12) and a first spray head (25). The top of the fifth mounting block (12) is connected to the bottom of the corresponding first mounting plate (2) and the second mounting plate (3). The first spray head (25) is located on one side of the corresponding fifth mounting block (12).

2. The multistage flue gas desulfurization spray tower according to claim 1, wherein, An air inlet (30) is installed at the bottom end of one side of the outer wall of the spray tower body (1). The air inlet (30) is communicated with the cavity. A plurality of third exhaust holes (9) are formed at one end of each of the seventh mounting plate (7), the first mounting plate (2), and the second mounting plate (3). The third exhaust holes (9) on the seventh mounting plate (7), the first mounting plate (2), and the second mounting plate (3) are arranged staggeredly. A PH sensor (11) is installed on one side of the upper end in the third exhaust hole (9). A first exhaust port (6) is formed at the top of the spray tower body (1). The first exhaust port (6) is communicated with the cavity.

3. The multi-stage flue gas desulfurization spray tower according to claim 2, characterized in that, Chutes (34) are formed along the length direction on both sides of the inner wall of the spray tower body (1). The seventh mounting plate (7), the first mounting plate (2), and the second mounting plate (3) are all slidably installed inside the spray tower body (1) through the chutes (34). A plurality of electric sliders (35) are slidably installed inside the chutes (34). One end of each of the seventh mounting plate (7), the first mounting plate (2), and the second mounting plate (3) is connected to the outer wall of one side of the corresponding electric slider (35).

4. A multi-stage flue gas desulfurization spray tower according to claim 2, characterized in that, A plurality of first electric rotating rods (21) are installed at the bottoms of the seventh mounting plate (7), the first mounting plate (2), and the second mounting plate (3). A first electric telescopic rod (22) is installed at the bottom of the first electric rotating rod (21). The bottom of the first electric telescopic rod (22) is connected to the top of the corresponding fifth mounting block (12).

5. A multi-stage flue gas desulfurization spray tower according to claim 4, characterized in that, Second electric rotating rods (23) are installed around the outer wall of the fifth mounting block (12). One end of the second electric rotating rod (23) is installed with a sixth mounting block (24). A first spray head (25) is installed at one end of one side of the outer wall of the sixth mounting block (24). A second spray head (26) is installed at the other end of one side of the outer wall of the sixth mounting block (24). A third spray head (27) is installed on one side of the outer wall of the sixth mounting block (24).

6. The multistage flue gas desulfurization spray tower according to claim 2, wherein, On both sides of the top of the inner wall of the cavity, a fourth mounting block (8) is installed. A plurality of first air outlets (13) are formed on the outer wall of one side of the fourth mounting block (8). On the top of the spray tower body (1) and on one side of the corresponding fourth mounting block (8), a first cleaning plate (14) is installed. A second cleaning plate (15) is installed outside the first cleaning plate (14).

7. The multi-stage flue gas desulfurization spray tower according to claim 6, characterized in that, A third electric telescopic rod (28) is installed between the top of the inner wall of the cavity and the corresponding first cleaning plate (14). A fourth electric telescopic rod (29) is installed between the first cleaning plate (14) and the corresponding second cleaning plate (15). At one end of the inner wall of the cavity and above the filter screen (5), a third cleaning plate (16) is installed. A fifth electric telescopic rod is installed between the third cleaning plate (16) and the inner wall of the cavity.

8. A multi-stage flue gas desulfurization spray tower according to claim 7, characterized in that, On the tops of the seventh mounting plate (7), the first mounting plate (2) and the second mounting plate (3), inclined panels (17) are installed. A plurality of grooves are formed on the tops of the inclined panels (17), and the bottoms of the grooves are inclined.

9. A multi-stage flue gas desulfurization spray tower according to claim 7, characterized in that, On the tops of the seventh mounting plate (7) and the first mounting plate (2), two support rods (33) are installed respectively. On the tops of the corresponding two support rods (33), a second packing layer (32) is installed. Inside the cavity and above the air inlet (30), a first packing layer (31) is installed.

10. A multi-stage flue gas desulfurization spray tower according to claim 9, characterized in that, At one end of the first mounting plate (2) and the seventh mounting plate (7), a first through groove (18) is formed respectively. At one end of the second mounting plate (3), a second through groove (19) is formed.

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