Device for removing sulfur dioxide in flue gas

Abstract

The invention relates to the technical field of flue gas treatment, in particular to a device for removing sulfur dioxide in flue gas. Comprising a tower body, the lower end of the tower body fixedly communicates with an air inlet pipe, the air inlet pipe is provided with a flow sensor, the upper end of the tower body fixedly communicates with an air outlet pipe, second side plates are fixed to the front side and the rear side in the tower body, and two first side plates are arranged between the two second side plates and connected with the tower body through electric telescopic rods; a spraying assembly is arranged at the central position in the upper end of the treatment cavity, and the spraying assembly is communicated with the liquid inlet flow control assembly. According to the invention, the two first side plates synchronously move towards each other or away from each other, so that the circulation cross-sectional area of the treatment cavity is changed in real time. When the flue gas flow is reduced, the cross section is reduced, the flue gas and the atomized treating fluid are forced to fill the cavity, and the effective contact area of the atomized treating fluid and the flue gas is ensured; when the flow is increased, the cross section is enlarged, the gas flow rate is reduced, and the reaction time of flue gas and atomized treating fluid is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flue gas treatment, in particular to a device for removing sulfur dioxide from flue gas. BACKGROUND

[0002] Flue gas desulfurization technology is the core link of industrial waste gas treatment, especially for battery production plants, battery recycling plants and other high sulfur dioxide emission industries. The traditional spray tower desulfurization device generally uses a fixed size reaction cavity and a constant flow spray system, which has significant defects in actual operation: 1. Poor working condition adaptability, when the flue gas flow fluctuates, the fixed cross-section treatment cavity is difficult to maintain efficient contact between gas and liquid. If the flue gas flow decreases suddenly, the gas flow rate in the cavity decreases, causing the droplets to settle too quickly, reducing the gas-liquid contact area and the desulfurization efficiency. Conversely, if the flue gas flow increases dramatically, the gas flow rate will be too fast, reducing the gas-liquid reaction time, and unreacted sulfur dioxide and atomized droplets can be easily carried away by the gas flow, resulting in incomplete desulfurization and waste of absorption liquid. 2. Energy and material waste, the existing system usually designs the spray amount according to the maximum flue gas load, and maintains a large flow rate when running at low load. The excess absorption liquid cannot participate in effective reaction and is discharged, increasing the energy consumption of the circulating pump and causing ineffective loss of treatment liquid. At the same time, the escaped atomized droplets may block the subsequent equipment, increasing maintenance costs. 3. The adjustment mechanism is fragmented, and some improved schemes try to adjust the spray density or cavity cross-section by independent actuators, but the mechanical structure is complex and the coordination is insufficient. For example, if the cavity cross-section is reduced without reducing the spray amount, liquid overflow may occur. If the cross-section is enlarged without increasing the spray amount, the unit flue gas desulfurization intensity will be insufficient. This non-linked adjustment method cannot achieve dynamic matching of gas and liquid, and instead exacerbates system instability.

[0003] Therefore, it is urgent to develop a desulfurization device that can automatically and cooperatively adjust the reaction space and spray intensity according to the flue gas flow, maintain high desulfurization efficiency under varying conditions, and minimize energy consumption and material loss. SUMMARY

[0004] The main purpose of the present application is to provide a device for removing sulfur dioxide from flue gas, which can automatically adjust the space of the treatment cavity and the spray amount of the treatment liquid according to the inlet amount of flue gas.

[0005] To achieve the above purpose, the technical solution provided by the present application is: The utility model provides a device of removing sulfur dioxide in flue gas, including tower body, the lower end fixed communication of tower body has the air inlet pipe, installs flow sensor on the air inlet pipe, the upper end fixed communication of tower body has the air outlet pipe, the front and back both sides in tower body are fixed with second side plate, two first side plates are arranged between two second side plates, two first side plates are symmetrically arranged, first side plate is inverted U shape, the free end of two flat parts of first side plate extends to the outside direction of tower body, two flat parts of first side plate respectively penetrate tower body lateral wall, two flat parts of first side plate are connected with the lateral wall of tower body sliding seal respectively, the front and back both ends of first side plate are connected with the opposite end face of two second side plates sliding seal respectively, first side plate is connected with tower body through electric telescopic link, electric telescopic link, controller and flow sensor electric connection, the processing cavity is formed between two first side plates and two second side plates, the center position of processing cavity upper end is provided with spray assembly, and spray assembly communicates with liquid inlet flow control assembly, spray assembly includes five spray units, five spray units are linear array in the sliding direction of first side plate, five spray units are connected through scissor connecting frame, in left and right direction, first spray unit and fifth spray unit are fixedly connected with the first side plate on left and right sides respectively, third spray unit is fixedly connected with two second side plates, second spray unit and fourth spray unit are connected with third spray unit slidingly.

[0006] Specifically, the spray unit includes a distribution box, end plates are fixed to the front and rear ends of the distribution box, and a plurality of atomizing nozzles are fixedly connected to the lower end of the distribution box; a scissor connecting frame is arranged on the front and rear sides of each of the five spray units, a pin rod on the horizontal center line of the scissor connecting frame is rotatably connected to the end plate, a plurality of guide rods are fixed to the end plate of the second spray unit and the end plate of the fourth spray unit, the length direction of the guide rods is parallel to the movement direction of the first side plate, the guide rods penetrate the end plate of the third spray unit, and the guide rods are slidably connected to the end plate of the third spray unit; a hole corresponding to the guide rods on the end plate of the fourth spray unit is formed in the end plate of the second spray unit, and a hole corresponding to the guide rods on the end plate of the second spray unit is formed in the end plate of the fourth spray unit.

[0007] Specifically, the distribution box of the first spray unit is fixedly connected to the left first side plate through a connecting rod, and the distribution box of the fifth spray unit is fixedly connected to the right first side plate through a connecting rod.

[0008] Specifically, the end plates at the front and rear ends of the third spray unit are fixedly connected to the second side plates on the front and rear sides, respectively.

[0009] Specifically, the liquid inlet flow control assembly comprises a water tank located above the spray assembly, the water tank is fixed on one of the second side plates, the water tank is communicated with the distribution boxes of the five spray units through a hose, an inlet is formed on the top plate of the water tank, the inlet is fixedly communicated with the first end of the liquid inlet pipe, a baffle is fixed on the vertical part of the right first side plate, the baffle penetrates through the right side wall of the water tank, the baffle is slidably connected with the right side wall of the water tank, the upper end of the baffle is slidably connected with the lower end of the top plate of the water tank, and the baffle can control the opening degree of the inlet of the top plate of the water tank after moving to the left side.

[0010] Specifically, the second end of the liquid inlet pipe is fixedly communicated with the liquid storage tank, the lower end of the tower body is communicated with the liquid storage tank through a liquid return pipe, and a water pump is installed on the liquid return pipe.

[0011] Specifically, an arc-shaped groove is formed on one side of the lower end of the tower body, an arc-shaped plate is detachably and fixedly connected in the arc-shaped groove, a filter screen is fixed on the inner edge of the arc-shaped plate, the filter screen is located in the lower end of the tower body, the outer edge of the filter screen is in contact with the inner edge of the tower body, a support plate is fixed in the tower body below the filter screen, the support plate supports the filter screen, and the air inlet pipe is located above the filter screen, and one end of the liquid return pipe communicated with the lower end of the tower body is located below the filter screen.

[0012] Specifically, a plurality of slide rods are fixed on the vertical part of the first side plate, a sleeve is slidably arranged on the outer side of the slide rod, one end of the sleeve is fixedly connected with the tower body, and the axial directions of the slide rod, the sleeve and the electric telescopic rod are parallel to the sliding direction of the first side plate.

[0013] Compared with the prior art, the present application has the following advantages: 1. The electric telescopic rod drives the two left-right symmetrical first side plates to move synchronously towards or away from each other, thereby changing the flow cross-sectional area of the treatment cavity in real time. When the flue gas flow decreases, the cross-sectional area is reduced, forcing the flue gas and the atomized treatment liquid to fill the cavity, thereby ensuring the effective contact area of the atomized treatment liquid and the flue gas. When the flow increases, the cross-sectional area is expanded, the gas flow rate is reduced, and the reaction time of the flue gas and the atomized treatment liquid is increased. In combination with the spray unit linkage telescopic mechanism, the atomized spray head group is clustered or dispersed, thereby ensuring uniform distribution of droplets covering the gas flow passage under different loads, and greatly improving the gas-liquid mass transfer efficiency. When the flue gas flow increases dramatically, expanding the cross-sectional area of the treatment cavity can significantly reduce the flue gas flow rate, and increasing the distance between the spray units increases the spraying area of the atomized treatment liquid, thereby ensuring the effective contact area of the flue gas and the atomized treatment liquid. The double action prolongs the gas-liquid two-phase contact reaction time, avoids the escape of unreacted sulfur dioxide under high load conditions, and ensures the stability of the desulfurization rate.

[0014] 2. The baffle mechanism driven by the right first side plate forms a linkage valve with the inlet of the water tank. When the flue gas flow decreases, the baffle moves to the left to block the liquid inlet, thereby reducing the supply of treatment liquid. When the flue gas flow increases, the baffle moves to the right to increase the opening degree, thereby synchronously increasing the spray intensity and realizing "on-demand spraying", thereby completely solving the problem of waste caused by excessive dosage of reagents under low load.

[0015] 3. Arc-shaped plate, filter screen and support plate constitute a detachable filtering module to intercept solid particles and non-evaporated liquid film in descending liquid drops, and the purified treatment liquid is returned to the liquid storage tank through the liquid return pipe for recycling. The modular design facilitates cleaning and maintenance, significantly reducing operation cost and waste liquid treatment burden.

[0016] 3. The rigid kinematic chain is formed by the scissors connecting frame and the guide rod insertion structure. The first spray unit and the fifth spray unit are directly driven by the first side plate; the second spray unit and the fourth spray unit are driven through the scissors connecting frame, and the second spray unit and the fourth spray unit are constrained by the third spray unit through the guide rod, so that the five spray units always maintain equidistant translation, avoiding blind areas or overlapping.

[0017] Eliminate the risk of uneven atomization coverage caused by mechanical asynchronization.

[0018] 4. The first side plate flat part is in sliding sealing connection with the tower body, and the front end and the rear end are in dynamic sealing with the second side plate, which, in combination with the slide rod and sleeve guide mechanism, ensures that there is no gas leakage during the size adjustment process of the cavity, resists the impact vibration of flue gas, and maintains long-term operation stability. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic view of the present application.

[0020] Figure 2 is a schematic view of the communication between the tower body and the liquid storage tank.

[0021] Figure 3 is a sectional view of the tower body.

[0022] Figure 4 is a schematic view of the cross section of the tower body.

[0023] Figure 5 is a schematic view of the connection between the spray assembly and the liquid inlet flow control assembly.

[0024] Figure 6 is a sectional view of the water tank and baffle connection structure.

[0025] Figure 7 is a schematic view of the connection between the arc-shaped plate and the filter screen.

[0026] Figure 8 is a schematic view of the scissors connecting frame.

[0027] Figure 9 is a schematic view of the first side plate on the right side.

[0028] Figure 10 is a schematic view of the connection between the scissors connecting frame and the end plate.

[0029] The components in the attached diagram are named as follows: 1. Tower body; 2. Inlet pipe; 3. Outlet pipe; 4. Liquid storage tank; 5. Arc-shaped plate; 6. Liquid inlet pipe; 7. Liquid return pipe; 8. First side plate; 9. Processing chamber; 10. Electric telescopic rod; 11. Water tank; 12. Atomizing nozzle; 13. Filter screen; 14. Second side plate; 15. Hose; 16. Distribution box; 17. End plate; 18. Scissor lift connecting frame; 19. Pin rod; 20. Connecting rod; 21. Insertion hole; 22. Guide rod; 23. Baffle; 24. Inlet; 25. Support plate; 26. Sliding rod; 27. Sleeve. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] like Figures 1-10 As shown, a device for removing sulfur dioxide from flue gas includes a tower body 1, an inlet pipe 2 fixedly connected to the lower end of the tower body 1, a flow sensor installed on the inlet pipe 2, and an outlet pipe 3 fixedly connected to the upper end of the tower body 1.

[0032] The tower body 1 has two second side plates 14 fixed on both the front and rear sides. Two first side plates 8 are arranged between the two second side plates 14. The two first side plates 8 are arranged symmetrically on the left and right. The first side plates 8 are inverted U-shaped. The free ends of the two straight parts of the first side plates 8 extend outward from the tower body 1. The two straight parts of the first side plates 8 penetrate the side wall of the tower body 1 respectively. The two straight parts of the first side plates 8 are slidably and sealed to the side wall of the tower body 1 respectively. The front and rear ends of the first side plates 8 are slidably and sealed to the opposite end faces of the two second side plates 14 respectively. The first side plates 8 are connected to the tower body 1 by an electric telescopic rod 10.

[0033] Multiple sliding rods 26 are fixed on the vertical part of the first side plate 8. A sleeve 27 is slidably sleeved on the outside of the sliding rod 26. One end of the sleeve 27 is fixedly connected to the tower body 1. The axial direction of the sliding rod 26, the sleeve 27 and the electric telescopic rod 10 is parallel to the sliding direction of the first side plate 8.

[0034] The electric telescopic pole 10, controller, and flow sensor are electrically connected.

[0035] The two first side plates 8 and the two second side plates 14 form a processing cavity 9.

[0036] A spray assembly is installed at the center of the upper end of the processing chamber 9, and the spray assembly is connected to the liquid inlet flow control assembly.

[0037] The spray assembly includes five spray units arranged linearly in the sliding direction of the first side plate 8. The five spray units are connected by a scissor lift bracket 18.

[0038] In the left-right direction, the first spray unit and the fifth spray unit are fixedly connected with the first side plates 8 on the left and right sides respectively, the third spray unit is fixedly connected with the two second side plates 14, and the second spray unit and the fourth spray unit are slidingly connected with the third spray unit.

[0039] The spray unit comprises a distribution box 16, end plates 17 are fixedly connected to the front and rear ends of the distribution box 16, and a plurality of atomizing nozzles 12 are fixedly connected to the lower end of the distribution box 16.

[0040] The distribution box 16 of the first spray unit is fixedly connected with the first side plate 8 on the left side through a connecting rod 20, and the distribution box 16 of the fifth spray unit is fixedly connected with the first side plate 8 on the right side through a connecting rod 20. The first side plates 8 on the left and right sides can drive the first spray unit and the fifth spray unit to move respectively.

[0041] The end plates 17 at the front and rear ends of the third spray unit are fixedly connected with the second side plates 14 on the front and rear sides respectively.

[0042] A scissor connecting frame 18 is arranged on the front and rear sides of each of the five spray units, and a pin rod 19 on the horizontal center line of the scissor connecting frame 18 is rotationally connected with the end plate 17.

[0043] When the first spray unit and the fifth spray unit move, the other spray units also move under the connection of the two scissor connecting frames 18, and the distances between the five spray units remain consistent.

[0044] A plurality of guide rods 22 are fixedly connected to the end plate 17 of the second spray unit and the end plate 17 of the fourth spray unit, the length direction of the guide rods 22 is parallel to the movement direction of the first side plate 8, the guide rods 22 penetrate the end plate 17 of the third spray unit, and the guide rods 22 are slidingly connected with the end plate 17 of the third spray unit. The end plate 17 of the second spray unit is provided with a plug hole 21 corresponding to the guide rod 22 on the end plate 17 of the fourth spray unit, and the end plate 17 of the fourth spray unit is provided with a plug hole 21 corresponding to the guide rod 22 on the end plate 17 of the second spray unit.

[0045] The liquid inlet flow control assembly comprises a water tank 11, the water tank 11 is located above the spray assembly, the water tank 11 is fixed to one of the second side plates 14, and the water tank 11 is in communication with the distribution boxes 16 of the five spray units through a hose 15. An inlet 24 is formed in the top plate of the water tank 11, the inlet 24 is fixedly communicated with the first end of the liquid inlet pipe 6, a baffle 23 is fixed to the vertical part of the first side plate 8 on the right side, the baffle 23 penetrates the right side wall of the water tank 11, the baffle 23 is slidingly and sealingly connected with the right side wall of the water tank 11, the upper end of the baffle 23 is in sliding sealing contact with the lower end of the top plate of the water tank 11, and after the baffle 23 moves to the left side, the baffle 23 can block the opening degree of the inlet 24 of the top plate of the water tank 11.

[0046] The second end of the liquid inlet pipe 6 is fixedly communicated with the liquid storage tank 4, and the lower end of the tower body 1 is communicated with the liquid storage tank 4 through a liquid return pipe 7, and the water pump is installed on the liquid return pipe 7.

[0047] An arc-shaped groove is formed on one side of the lower end of the tower body 1, and an arc-shaped plate 5 is detachably fixedly and sealingly connected in the arc-shaped groove. The inner edge of the arc-shaped plate 5 is fixedly connected with a filter screen 13, the filter screen 13 is located in the lower end of the tower body 1, the outer edge of the filter screen 13 is in contact with the inner edge of the tower body 1, a support plate 25 is fixedly arranged in the tower body 1 below the filter screen 13, the support plate 25 supports the filter screen 13, and the air inlet pipe 2 is located above the filter screen 13, and one end of the liquid return pipe 7 communicated with the lower end of the tower body 1 is located below the filter screen 13.

[0048] In use, the flue gas pipe is communicated with the air inlet pipe 2, so that the air outlet pipe 3 is connected with the subsequent flue gas treatment equipment. The flue gas enters the tower body 1 through the air inlet pipe 2. Then the water pump is started, the treatment liquid in the liquid storage tank 4 enters the water tank 11 through the liquid inlet pipe 6, the treatment liquid in the water tank 11 enters the five distribution tanks 16 through the hose 15, and the treatment liquid in the distribution tank 16 is sprayed out through the plurality of atomizing nozzles 12 and then descends in the treatment cavity 9.

[0049] The flue gas entering the tower body 1 through the air inlet pipe 2 ascends in the treatment cavity 9, and the ascending flue gas fully contacts and reacts with the descending misty treatment liquid in the treatment cavity 9, so that the sulfur dioxide in the flue gas can be removed.

[0050] After the treatment liquid reacts with the flue gas, the solid particles in the flue gas descend in the treatment cavity 9 with the atomized treatment liquid, the atomized treatment liquid gradually liquefies in the descending process in the treatment cavity 9, and the liquefied treatment liquid gathers in the lower end of the tower body 1 after passing through the filter screen 13. The treatment liquid in the lower end of the tower body 1 returns to the liquid storage tank 4 through the liquid return pipe 7 again for circulation.

[0051] The flue gas after reacting with the atomized treatment liquid is discharged through the air outlet pipe 3 and then enters the subsequent flue gas treatment equipment.

[0052] The flow sensor on the air inlet pipe 2 monitors the flue gas flow entering the tower body 1 in real time. When the flue gas intake amount decreases, the flow sensor sends a signal of reduced flue gas flow to the controller, the controller starts the two electric telescopic rods 10 to make the two electric telescopic rods 10 elongate, so that the two first side plates 8 are close to each other, thereby reducing the flow cross-sectional area of the treatment cavity 9, so that the flue gas entering the treatment cavity 9 can fill in the treatment cavity 9, and the effective contact area of the flue gas and the misty treatment liquid is ensured.

[0053] When the two first side plates 8 are close to each other, the first side plate 8 on the left and the first side plate 8 on the right respectively drive the first spray unit and the fifth spray unit to move towards the center of the treatment cavity 9, under the connection of the scissors connecting frame 18, the other spray units move simultaneously, and the interval of the five spray units remains unchanged. When the two first side plates 8 are close to each other, the atomizing nozzle 12 is concentrated towards the center of the treatment cavity 9, so that the mist treatment liquid sprayed by the atomizing nozzle 12 can fill in the treatment cavity 9, thereby ensuring the effective contact area of the atomized treatment liquid and the flue gas.

[0054] During the process that the two first side plates 8 are close to each other, the first side plate 8 on the right drives the baffle 23 to move towards the left direction, after the baffle 23 moves towards the left direction in the water tank 11, the baffle 23 can shield the inlet 24 part at the upper end of the water tank 11, that is, when the flue gas flow decreases, the amount of treatment liquid entering the water tank 11 also decreases, and the discharge amount of the plurality of atomizing nozzles 12 also decreases, thereby avoiding that when the flue gas flow is small, the treatment liquid still discharges at a large amount, and avoiding that when the flue gas flow is small, most of the mist treatment liquid is discharged from the gas outlet pipe 3, thereby avoiding the waste of treatment liquid.

[0055] Conversely, when the flue gas flow of the gas inlet pipe 2 increases, the two electric telescopic rods 10 respectively drive the two first side plates 8 to move away from each other, the flow cross-sectional area of the treatment cavity 9 increases, at the same time, the five spray units move away from each other, and the plurality of atomizing nozzles 12 are dispersed, when the flue gas flow is large, by increasing the flow cross-sectional area of the treatment cavity 9, the upward speed of the flue gas in the treatment cavity 9 and the downward speed of the mist treatment liquid in the treatment cavity 9 are reduced, thereby increasing the reaction time of the mist treatment liquid and the flue gas, and improving the removal effect of sulfur dioxide in the flue gas.

[0056] When the flow cross-sectional area of the treatment cavity 9 increases, the baffle 23 moves towards the right direction with the first side plate 8 on the right, the opening of the inlet 24 at the top of the water tank 11 increases, the amount of treatment liquid entering the water tank 11 increases, and the liquid discharge amount of the plurality of atomizing nozzles 12 also increases, that is, when the flue gas flow increases, the liquid discharge amount of the atomizing nozzle 12 also increases, thereby ensuring the treatment effect of the flue gas when the flue gas flow is large.

[0057] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for removing sulfur dioxide from flue gas, comprising a tower body (1), an inlet pipe (2) fixedly connected to the lower end of the tower body (1), a flow sensor installed on the inlet pipe (2), and an outlet pipe (3) fixedly connected to the upper end of the tower body (1), characterized in that, The tower body (1) has two second side plates (14) fixed on both the front and rear sides. Two first side plates (8) are arranged between the two second side plates (14). The two first side plates (8) are arranged symmetrically on the left and right. The first side plates (8) are inverted U-shaped. The free ends of the two straight parts of the first side plates (8) extend outward from the tower body (1). The two straight parts of the first side plates (8) penetrate the side wall of the tower body (1) respectively. The two straight parts of the first side plates (8) are slidably sealed to the side wall of the tower body (1) respectively. The front and rear ends of the first side plates (8) are slidably sealed to the opposite end faces of the two second side plates (14) respectively. The first side plates (8) are connected to the tower body (1) by an electric telescopic rod (10). The controller and flow sensor are electrically connected. The two first side plates (8) and the two second side plates (14) form a processing chamber (9). A spray assembly is provided at the center of the upper end of the processing chamber (9). The spray assembly is connected to the liquid inlet flow control assembly. The spray assembly includes five spray units. The five spray units are linearly arrayed in the sliding direction of the first side plate (8). The five spray units are connected by a scissor bracket (18). In the left and right direction, the first spray unit and the fifth spray unit are fixedly connected to the first side plates (8) on the left and right sides respectively. The third spray unit is fixedly connected to the two second side plates (14). The second spray unit and the fourth spray unit are slidably connected to the third spray unit.

2. The apparatus for removing sulfur dioxide from flue gas according to claim 1, characterized in that, The spray unit includes a distribution box (16), with end plates (17) fixed at both ends of the distribution box (16). Multiple atomizing nozzles (12) are fixedly connected to the lower end of the distribution box (16). A scissor-mounted connecting frame (18) is provided on both the front and rear sides of each of the five spray units. A pin (19) on the horizontal center line of the scissor-mounted connecting frame (18) is rotatably connected to the end plate (17). Multiple guide rods (22) are fixed on the end plate (17) of the second spray unit and the end plate (17) of the fourth spray unit. 2) The length direction is parallel to the movement direction of the first side plate (8). The guide rod (22) passes through the end plate (17) of the third spray unit. The guide rod (22) is slidably connected to the end plate (17) of the third spray unit. The end plate (17) of the second spray unit has a corresponding insertion hole (21) on the guide rod (22) on the end plate (17) of the fourth spray unit. The end plate (17) of the fourth spray unit has a corresponding insertion hole (21) on the guide rod (22) on the end plate (17) of the second spray unit.

3. The apparatus for removing sulfur dioxide from flue gas according to claim 2, characterized in that, The distribution box (16) of the first spray unit is fixedly connected to the first side plate (8) on the left side via a connecting rod (20), and the distribution box (16) of the fifth spray unit is fixedly connected to the first side plate (8) on the right side via a connecting rod (20).

4. The apparatus for removing sulfur dioxide from flue gas according to claim 2, characterized in that, The end plates (17) at both ends of the third spray unit are fixedly connected to the second side plates (14) on the front and rear sides, respectively.

5. The apparatus for removing sulfur dioxide from flue gas according to claim 1, characterized in that, The liquid inlet flow control component includes a water tank (11), which is located above the spray assembly. The water tank (11) is fixed on one of the second side plates (14). The water tank (11) is connected to the distribution box (16) of the five spray units through a hose (15). An inlet (24) is provided on the top plate of the water tank (11). The inlet (24) is fixedly connected to the first end of the liquid inlet pipe (6). A baffle (23) is fixed on the vertical part of the first side plate (8) on the right side. The baffle (23) penetrates the right side wall of the water tank (11). The baffle (23) is slidably sealed to the right side wall of the water tank (11). The upper end of the baffle (23) is slidably sealed to the lower end of the top plate of the water tank (11). After the baffle (23) moves to the left, it can control the opening degree of the inlet (24) of the top plate of the water tank (11).

6. The apparatus for removing sulfur dioxide from flue gas according to claim 5, characterized in that, The second end of the inlet pipe (6) is fixedly connected to the storage tank (4), and the lower end of the tower body (1) is connected to the storage tank (4) through the return pipe (7). A water pump is installed on the return pipe (7).

7. The apparatus for removing sulfur dioxide from flue gas according to claim 6, characterized in that, An arc-shaped groove is provided on one side of the lower end of the tower body (1). An arc-shaped plate (5) is detachably fixed and sealed in the arc-shaped groove. A filter screen (13) is fixed on the inner edge of the arc-shaped plate (5). The filter screen (13) is located inside the lower end of the tower body (1). The outer edge of the filter screen (13) is in contact with the inner edge of the tower body (1). A support plate (25) is fixed inside the tower body (1) below the filter screen (13). The support plate (25) supports the filter screen (13). The air inlet pipe (2) is located above the filter screen (13). One end of the return liquid pipe (7) connected to the lower end of the tower body (1) is located below the filter screen (13).

8. The apparatus for removing sulfur dioxide from flue gas according to claim 1, characterized in that, Multiple sliding rods (26) are fixed on the vertical part of the first side plate (8). A sleeve (27) is slidably sleeved on the outside of the sliding rod (26). One end of the sleeve (27) is fixedly connected to the tower body (1). The axial direction of the sliding rod (26), the sleeve (27) and the electric telescopic rod (10) is parallel to the sliding direction of the first side plate (8).

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