Industrial flue gas denitration and desulfurization integrated device

Abstract

The present application belongs to the field of flue gas denitration and desulfurization technology, in particular to an industrial flue gas denitration and desulfurization integrated equipment. The following scheme is proposed, which comprises an absorber, a plurality of nozzles arranged on the absorber, an upper pipe communicated with the top of the gas outlet end of the absorber, a lower pipe communicated with the bottom of the gas outlet end of the absorber, the upper pipe being arranged in an upwardly curved arc structure, a rotating mesh cylinder arranged at the end of the upper pipe away from the absorber, a gas return pipe communicated between one end of the lower pipe and the gas inlet end of the absorber, an air return device group arranged on the gas return pipe, the air return device group mainly comprising a fan and a check valve, and a liquid discharge pipe communicated with the bottom of the lower pipe. The curved change of the arc of the upper pipe and the centrifugal operation of the rotating mesh cylinder separate the gas, the carried liquid and part of the generated solid impurities at the position of the upper pipe, so as to separate the liquid and solid impurities from the gas through the rotating mesh cylinder, and ensure the cleanliness of the exhaust gas.

Description

Technical Field

[0001] This invention relates to the field of flue gas denitrification and desulfurization technology, and in particular to an integrated industrial flue gas denitrification and desulfurization device. Background Technology

[0002] Integrated industrial flue gas denitrification and desulfurization equipment is a highly efficient and environmentally friendly technology that has been developed in recent years to meet the needs of industrial waste gas treatment.

[0003] Low-temperature oxidation is a highly efficient flue gas denitrification and desulfurization technology. Its core principle is to use a strong oxidant to denitrate NO under low-temperature conditions. X The gas is oxidized to higher oxidation states of nitrogen oxides (such as NO2 and N2O5), and then absorbed by alkaline solution to generate recyclable nitrates and sulfates. Usually, the oxidized gas is absorbed by spraying. However, during continuous introduction, the gas may not come into complete contact with the alkaline solution or the treated gas may be mixed with impurities, which will affect the exhaust. Summary of the Invention

[0004] Based on the technical problems in the background technology, the present invention proposes an integrated industrial flue gas denitrification and desulfurization equipment.

[0005] This invention proposes an integrated industrial flue gas denitrification and desulfurization device, comprising an absorber with multiple nozzles. The top of the absorber's outlet is connected to an upper pipe, and the bottom of the absorber's outlet is connected to a lower pipe. The upper pipe is configured as an upwardly curved arc structure, and a rotating screen is installed at the end of the upper pipe away from the absorber. A return gas pipe is connected between one end of the lower pipe and the absorber's inlet, and a return air unit is installed on the return gas pipe. The return air unit mainly consists of a fan and a one-way valve, and a drain pipe is connected to the bottom of the lower pipe.

[0006] Preferably, the absorber is provided with a horizontal cavity, a vertical cavity, a spray cavity and a connecting cavity in sequence from the air inlet end to the air outlet end. The end of the vertical cavity away from the horizontal cavity extends downward, the spray cavity extends horizontally, and multiple nozzles are distributed at the top of the spray cavity. The bottom inner wall of the vertical cavity is located above the bottom inner wall of the spray cavity, and the end of the return air pipe connected to the absorber is located at the bottom of the vertical cavity.

[0007] Preferably, the connecting cavity extends vertically upward from the end of the spray cavity, the lower pipe corresponds to the bottom position of the connecting cavity and the opening of the spray cavity, the upper pipe corresponds to the top position of the connecting cavity and is located above the spray cavity.

[0008] Preferably, the lower tube is bent into an arc shape in the vertical direction, and the middle position of the lower tube is bent away from the absorber.

[0009] Preferably, the upper tube is provided with an arc cavity and a cylindrical cavity. The arc cavity is directly connected to the absorber. The outer and inner walls of the rotating mesh cylinder are both designed as upwardly contracting frustum-shaped structures. The top of the rotating mesh cylinder is sealed and the bottom of the rotating mesh cylinder is open. An upper tube cover is installed at the end of the upper tube away from the absorber. A rotating shaft is fixed at the top of the rotating mesh cylinder. The outer wall of the rotating shaft is rotatably connected to the upper tube cover. A motor is driven to the top of the rotating shaft. An exhaust pipe is connected to one side of the top of the upper tube cover. A retaining ring is fixed on the inner wall of the cylindrical cavity above the rotating mesh cylinder.

[0010] Preferably, a laser gas analyzer is installed on the exhaust pipe. The laser gas analyzer is used to detect the exhaust quality. When the laser gas analyzer detects a decrease in exhaust quality, it controls the rotation speed of the rotating mesh drum to increase.

[0011] Preferably, the inner wall of the arc cavity is slidably connected to two guide plates, the ends of which are connected to an arc-shaped electric guide rail, and the guide plates are provided with guide holes.

[0012] Preferably, the guide holes are distributed in one end area of ​​the side of the guide plate, and the guide holes on the two guide plates are located at both ends, so that the guide holes will be completely covered when the two guide plates overlap.

[0013] Preferably, the motor is connected to a current sensor and a speed sensor. The current sensor and speed sensor are used to monitor the rotational load state of the motor carrying the rotating mesh cylinder, and to control the distance between the two guide plates according to the load of the rotating mesh cylinder and the exhaust quality.

[0014] Preferably, a shaft is rotatably provided at the middle position of the connecting cavity, one end of the shaft is connected to a reciprocating deflection motor, a vertically downward lower air plate is fixed at the bottom of the shaft, and a horizontally extending upper air plate is fixed on the side of the shaft facing the spray cavity. Both the upper and lower air plates are provided with air holes, and a gap is left between the ends of the upper and lower air plates away from the shaft and the inner wall of the absorber.

[0015] The beneficial effects of this invention are as follows:

[0016] In this invention, the curved design of the upper pipe and the centrifugal operation of the rotating screen separate the gas, the carried liquid, and some of the generated solid impurities at the upper pipe position. This facilitates the separation of liquid and solid impurities from the gas by the rotating screen, ensuring the cleanliness of the exhaust gas. The curved design of the lower pipe causes the inner wall of the chamber inside the lower pipe to flip up and down during the bending process, allowing the liquid to come into contact downwards and the gas to come into contact upwards. This fully utilizes the spray liquid to make sufficient contact and reaction treatment on the gas that needs to be returned, thereby improving work efficiency.

[0017] In this invention, by combining the load state of the rotating mesh cylinder with the exhaust quality for dynamic adaptation and adjustment, it can not only reduce impurity accumulation by actively controlling the flow under high load, avoiding motor overload and mechanical wear to extend the service life of the equipment, but also reduce the flow in conjunction with the exhaust quality to ensure compliance when it is abnormal, and increase the flow to improve the processing efficiency when the load meets the standard. This achieves reasonable energy consumption and reduces ineffective waste. At the same time, by adapting to complex working conditions through the graded adjustment logic for special scenarios, it significantly improves the stability of equipment operation, anti-interference ability and reliability of flue gas treatment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an integrated industrial flue gas denitrification and desulfurization equipment proposed in this invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of the absorber in an integrated industrial flue gas denitrification and desulfurization device proposed in this invention.

[0020] Figure 3 This is a partial structural diagram of the nozzle position of an integrated industrial flue gas denitrification and desulfurization device proposed in this invention;

[0021] Figure 4 This is a schematic diagram of the position and structure of the lower and upper air plates of an integrated industrial flue gas denitrification and desulfurization device proposed in this invention.

[0022] Figure 5 This is a schematic diagram of the upper pipe position structure of an integrated industrial flue gas denitrification and desulfurization equipment proposed in this invention;

[0023] Figure 6 This is a schematic diagram of the rotating duct position structure of an integrated industrial flue gas denitrification and desulfurization equipment proposed in this invention.

[0024] In the diagram: 1 Absorber, 2 Nozzle, 3 Upper Pipe, 301 Arc Cavity, 302 Cylinder Cavity, 4 Lower Pipe, 5 Drain Pipe, 6 Return Air Pipe, 7 Return Air Unit, 8 Rotating Screen Cylinder, 801 Notch 1, 9 Exhaust Pipe, 10 Horizontal Cavity, 11 Vertical Cavity, 12 Spray Cavity, 13 Connecting Cavity, 14 Upper Pipe Cover, 15 Rotating Shaft, 16 Motor, 17 Retaining Ring, 18 Guide Plate, 181 Guide Hole, 19 Electric Guide Rail, 20 Shaft Rod, 21 Shaft Seat, 22 Lower Air Plate, 23 Upper Air Plate. Detailed Implementation

[0025] Example 1: Refer to Figures 1-6An integrated industrial flue gas denitrification and desulfurization device includes an absorber 1 with multiple nozzles 2. An upper pipe 3 connects to the top of the absorber 1's outlet, and a lower pipe 4 connects to the bottom of the absorber 1's outlet. It should be noted that the flue gas, after being oxidized by contact with ozone or hydrogen peroxide, actively enters the absorber 1 from its inlet direction. Both the upper pipe 3 and the lower pipe 4 are connected to the absorber 1's outlet, with the upper pipe 3 positioned above the lower pipe 4. The upper pipe 3 is configured with an upwardly curved arc shape, with the end of the upper pipe 3 furthest from the absorber 1 vertically upward. A rotating mesh cylinder 8 is installed inside the upper pipe 3 at the end furthest from the absorber 1. A return pipe 6 connects one end of the lower pipe 4 to the absorber 1's inlet. It should be noted that one end of the return pipe 6 connects to the top of the end of the lower pipe 4 furthest from the absorber 1's outlet. The other end of the gas pipe 6 is connected to the air inlet of the absorber 1; a return air unit 7 is installed on the return air pipe 6. The return air unit 7 mainly consists of a fan and a one-way valve. The fan is used to actively introduce the airflow in the lower pipe 4 into the air inlet of the absorber 1. The one-way valve prevents the airflow at the air inlet of the absorber 1 from directly entering the lower pipe 4. The bottom of the lower pipe 4 is connected to a drain pipe 5. In use, the flue gas is oxidized with ozone or hydrogen peroxide and then introduced into the air inlet of the absorber 1. The flue gas is then treated by spraying alkaline solution through the nozzles 2 distributed above the middle position of the absorber 1. Under normal conditions, after the spray reaction treatment, the liquid and a small amount of gas are drawn out from the lower pipe 4. The liquid is drawn out for treatment and reuse or discharge, while some of the gas in the lower pipe can flow back into the absorber 1 through the return air pipe 6. The large amount of treated gas is drawn upward from the upper pipe 3 and discharged.

[0026] If any gas does not fully react with the alkaline solution, it will be introduced downwards into the lower pipe 4 due to the large amount of impurities and weight of the untreated gas. It will then be sent back to the absorber 1 for treatment via the return gas pipe 6. Even if some untreated gas enters the upper pipe 3, the curved design of the upper pipe 3 will cause the channel to bend and change. The untreated gas will collide and contact with some of the liquid carried by the gas in the upper pipe 3, and make full contact at the position of the rotating screen 8 to ensure complete treatment of the emitted gas.

[0027] Furthermore, through the curved bending of the upper pipe 3 and the centrifugal operation of the rotating screen 8, the gas, the carried liquid, and some of the generated solid impurities are separated at the position of the upper pipe 3, so as to facilitate the separation of liquid and solid impurities from gas by the rotating screen 8 and ensure the cleanliness of the exhaust gas.

[0028] In this invention, the absorber 1 is provided with a horizontal cavity 10, a vertical cavity 11, a spray cavity 12, and a connecting cavity 13 arranged sequentially from the air inlet end to the air outlet end. The end of the horizontal cavity 10 away from the vertical cavity 11 is the air inlet end of the absorber 1. The end of the vertical cavity 11 away from the horizontal cavity 10 extends downward. The vertical change of the horizontal cavity 10 and the vertical cavity 11 reduces the impact force of the air inlet and avoids excessive airflow speed leading to too much untreated gas. The spray cavity 12 is arranged horizontally at the bottom of the vertical cavity 11. Multiple nozzles 2 are distributed at the top of the spray cavity 12. The inner wall of the bottom end of the vertical cavity 11 is located above the inner wall of the bottom of the spray cavity 12. The end of the return pipe 6 connected to the absorber 1 is located at the bottom of the vertical cavity 11. The gas returned to the absorber 1 by the return pipe 6 is sprayed upward from the bottom of the vertical cavity 11 to further offset the impact force of the air inlet. In addition, the position where the return pipe 6 is connected to the absorber 1 is raised relative to the bottom of the spray area to prevent a large amount of liquid from entering the return pipe 6.

[0029] In this invention, the connecting cavity 13 extends vertically upward from the end of the spray cavity 12. The lower pipe 4 corresponds to the bottom position of the connecting cavity 13 and the opening of the spray cavity 12. The upper pipe 3 corresponds to the top position of the connecting cavity 13 and is located above the spray cavity 12. Through the height difference between the upper pipe 3 and the lower pipe 4 and the correspondence between the lower pipe 4 and the opening of the spray cavity 12, in the initial stage of flue gas entering the treatment, the height difference between the upper pipe 3 and the lower pipe 4 allows a large amount of flue gas containing liquid and impurities to directly flow into the lower pipe 4 for circulation treatment, avoiding the incomplete treatment of flue gas in the initial stage and direct discharge.

[0030] In this invention, the lower pipe 4 is bent into an arc shape in the vertical direction, and the middle position of the lower pipe 4 bends away from the absorber 1. That is, the end of the lower pipe 4 away from the gas outlet of the absorber 1 extends towards the gas inlet of the absorber 1. The drain pipe 5 is installed at the bottom of the lower pipe 4 near the return gas pipe 6. In use, the bending of the lower pipe 4 causes the inner wall of the chamber inside the lower pipe 4 to flip up and down during the bending process. That is, after the liquid is at the bottom and the gas is at the top, it will flip up due to the guidance of the lower pipe 4, so that the liquid is downward and the gas is upward in interactive contact. This makes full use of the spray liquid to fully contact and react with the gas that needs to be returned, thereby improving the working efficiency.

[0031] In this invention, the upper tube 3 is provided with an arc cavity 301 and a cylindrical cavity 302. The arc cavity 301 is directly connected to the absorber 1. The inner wall of the cylindrical cavity 302 is configured as a cylindrical structure with a vertical axis. The outer and inner walls of the rotating mesh cylinder 8 are both configured as upwardly contracting frustum-shaped structures. The top of the rotating mesh cylinder 8 is sealed and the bottom of the rotating mesh cylinder 8 is open. The outer wall of the rotating mesh cylinder 8 is provided with mesh holes. The bottom of the outer wall of the rotating mesh cylinder 8 is in sliding contact with the inner wall of the cylindrical cavity 302. The bottom of the outer wall of the rotating mesh cylinder 8 is provided with multiple notches 801, so that the splashed liquid can flow down from the notches 801 and flow back to the position of the connecting cavity 13 and the lower tube 4. An upper tube cover 14 is installed at the end of the upper tube 3 away from the absorber 1. A rotating shaft 15 is fixed at the top of the rotating screen 8. The outer wall of the rotating shaft 15 is rotatably connected to the upper tube cover 14. A motor 16 is driven to the top of the rotating shaft 15 to realize the rotation of the rotating screen 8 and control its speed. An exhaust pipe 9 is connected to one side of the top of the upper tube cover 14. A retaining ring 17 is fixed on the inner wall of the cylinder cavity 302 above the rotating screen 8 to block the splashed liquid while ensuring gas flow, thereby improving the separation effect of gas, liquid and solid impurities. A laser gas analyzer is installed on the exhaust pipe 9. The laser gas analyzer is used to detect the exhaust quality. When the laser gas analyzer detects a decrease in exhaust quality, it controls the rotation speed of the rotating screen 8 to increase, thereby enhancing the separation effect between gas and impurities.

[0032] In this invention, two guide plates 18 are slidably connected to the inner wall of the arc cavity 301. An arc-shaped electric guide rail 19 is connected to the end of each guide plate 18. The electric guide rail 19 is adapted to the axis of the arc cavity 301, allowing it to move the guide plate 18 along the inner wall of the arc cavity 301. Guide holes 181 are provided on the guide plates 18, distributed at one end of the side of the guide plate 18. The guide holes 181 are located at one end of the horizontal direction of the guide plate 18, and the guide holes 181 on the two guide plates 18 are located at opposite ends. That is, the guide holes 181 on one guide plate 18 are not separated from those on the other guide plate 18. The physical positions of the guide holes 181 correspond to each other. When the two guide plates 18 overlap, the guide holes 181 will be completely covered. Under normal conditions, the two guide plates 18 are separated, and the airflow passes through the guide holes 181 of the two guide plates 18 to filter out impurities and some liquids in the airflow. The staggered arrangement of the guide holes 181 on the two guide plates 18 improves the filtration effect. At the same time, the distance between the two guide plates 18 can be adjusted according to the exhaust quality. When the exhaust quality decreases, the distance between the two guide plates 18 needs to be shortened to reduce the gas flow between the guide plates 18, so that more gas can flow downwards for recirculation, thereby further improving the flue gas treatment effect.

[0033] In this invention, a shaft 20 is rotatably mounted at the middle position of the connecting cavity 13, and the two ends of the shaft 20 are rotatably connected to the two ends of the connecting cavity 13. A bearing seat 21 is installed on the inner wall of the connecting cavity 13 at a position corresponding to the shaft 20, and the two ends of the shaft 20 are rotatably connected to the bearing seat 21. A reciprocating deflection motor is driven to one end of the shaft 20. A vertically downward downward airflow plate 22 is fixed to the bottom of the shaft 20, and a horizontally extending upper airflow plate 23 is fixed to the side of the shaft 20 facing the spray cavity 12. Air holes are provided on both the upper airflow plate 23 and the lower airflow plate 22. The ends of the upper and lower air plates 23 and 22, which are away from the shaft 20, have gaps between them and the inner wall of the absorber 1. On the one hand, the upper and lower air plates 23 and 22 perform preliminary filtration on the gas entering the upper pipe 3 and lower pipe 4, causing some impurities to remain and fall down along the inner wall of the lower pipe 4. On the other hand, the upper and lower air plates 23 and 22 actively swing back and forth with small amplitudes to guide the airflow to disperse, so that the fully treated gas, the incompletely treated gas, and the gas containing impurities can be dispersed under the difference in gravity, thus ensuring the complete treatment effect of the exhaust gas.

[0034] Example 2: Refer to Figures 1-6 An integrated industrial flue gas denitrification and desulfurization device, based on Example 1, is equipped with a detection module and a control module:

[0035] The detection module includes: a laser gas analyzer, installed in the vertical section of the exhaust pipe, used to detect NO in the emitted flue gas. X and SO2 concentration;

[0036] Hall current sensor: It is connected in series in the power supply circuit of the rotating mesh drum motor and is fixed by snap-fit. It is used to detect the motor's operating current and indirectly reflect the load condition of the rotating mesh drum.

[0037] Hall effect speed sensor: Installed on the side of the rotating shaft of the rotating mesh drum and fixed to the inner wall of the upper tube cover by a bracket, it is used to monitor the rotation speed of the rotating mesh drum in real time;

[0038] Displacement sensor: Installed on the outer wall of the arc cavity at the position corresponding to the guide plate. A magnetic induction sheet is fixed on the side of each guide plate to detect the size of the gap between the two guide plates.

[0039] The control module includes: a Siemens S7-1200 PLC as the main controller; two analog input modules for acquiring analog signals from various sensors; and a touch screen as the human-machine interface, which can display the equipment's operating parameters and status in real time.

[0040] Initialization operation: set the guide plate reference gap and the reference rotation speed of the rotating screen cylinder; set the control threshold for exhaust quality: NOx≤50ppm, SO2≤100ppm; all sensors perform self-checks; if a fault is found, an audible and visual alarm is triggered and the fault location is displayed on the touch screen.

[0041] During normal system operation, each sensor collects data at a frequency of 1 time per second and transmits it to the PLC controller; the laser gas analyzer detects NO in the exhaust pipe. X The system monitors the concentration of SO2; a Hall current sensor collects the operating current of the rotating mesh drum motor; a Hall speed sensor monitors the actual rotation speed of the rotating mesh drum; a displacement sensor detects the actual gap between the two guide plates; it should be noted that the controller filters the received data and uses the average of 5 samples as the valid data to avoid the impact of instantaneous fluctuations on control decisions.

[0042] The controller adjusts the guide plate gap according to the following strategy based on the rotating mesh drum motor current (reflecting the load condition) and the exhaust quality:

[0043] First, when the Hall current sensor detects that the current of the rotating mesh drum motor is in the low load range (indicating that there are few impurities adhering to the surface of the mesh drum and no obvious accumulation), the gap is adjusted in conjunction with the exhaust quality status:

[0044] If the laser gas analyzer detects that the exhaust concentration meets the standard (the content of harmful gases meets the preset threshold): control the electric guide rail to drive the guide plate to move in the direction of "expanding the gap", and make full use of the current low load processing capacity of the mesh cylinder by increasing the ventilation channel of the upper tube arc cavity;

[0045] If the exhaust concentration is in a warning or excessive state (the content of harmful gases exceeds the preset threshold): keep the current reference gap of the guide plate unchanged, do not reduce the gap further (avoid excessive flow restriction leading to a significant decrease in processing capacity), prioritize improving the exhaust quality by adjusting the rotation speed of the rotating screen cylinder to enhance separation efficiency. The core reason for abnormal concentration is insufficient separation efficiency, rather than excessive amount of impurities entering the screen cylinder, so there is no need to control impurities by reducing the gap.

[0046] Second, when the motor current is in the medium load range (indicating that impurities begin to accumulate on the surface of the mesh cylinder and the load gradually increases), dynamic adjustments should be made in conjunction with the exhaust quality:

[0047] If the exhaust concentration meets the standard: maintain the current gap of the guide plate, and continuously monitor the change of motor current. If the current continues to rise to the upper limit of the medium load range (close to the high load threshold), drive the guide plate to move in the direction of "reducing the gap". By reducing the air flow and impurity mass entering the mesh cylinder, reduce the load of the mesh cylinder in advance and avoid further accumulation of impurities that may cause the load to exceed the limit.

[0048] If the exhaust concentration is in a warning or excessive state: drive the guide plate to move in the direction of "reducing the gap". By reducing the ventilation channel, on the one hand, the amount of untreated flue gas directly entering the exhaust pipe is reduced, and on the other hand, the amount of impurities entering the screen cylinder is reduced, reducing the separation burden of the screen cylinder. Combined with the increase in the rotation speed of the screen cylinder, a dual linkage of "impurity control + efficiency improvement" is formed, which quickly improves the exhaust quality.

[0049] Third, when the motor current is in the high load range (indicating significant impurity accumulation on the mesh cylinder surface and the load approaching the equipment's safe upper limit), regardless of whether the exhaust quality meets the standards, the gap should be adjusted with "reducing the mesh cylinder load" as the core objective:

[0050] The drive guide plate moves in the direction of "significantly reducing the gap", which greatly reduces the air flow and impurity volume entering the mesh cylinder by significantly reducing the ventilation channel, allowing the mesh cylinder sufficient time to remove the impurities accumulated on the surface and gradually reduce the load;

[0051] If the motor current remains at the upper limit of the high load range (risk of overload): trigger the guide plate "intermittent shutdown" control mode - drive the guide plate to move to the minimum gap state (close to completely blocking the airflow) and maintain it for the set time, forcibly cut off the airflow and impurities entering the mesh cylinder, allowing the mesh cylinder to concentrate on cleaning the surface residual impurities under low load, and after the current drops back to the safe range, gradually restore the gap to a reasonable range.

[0052] When "exhaust gas concentration seriously exceeds the standard" and "screen cylinder is under high load" occur simultaneously (i.e., impurity accumulation leads to insufficient separation efficiency, and excessive airflow exacerbates the concentration exceeding the standard):

[0053] First, reduce the guide plate gap under high load conditions to reduce impurity input and excessive gas emission through flow restriction;

[0054] After the current in the mesh cylinder drops back to the medium load range (impurity accumulation is relieved), the gap is finely adjusted according to the change in exhaust concentration. If the concentration still does not meet the standard, the reduced gap is maintained to ensure the flow control effect. If the concentration meets the standard, the gap is gradually expanded to a reasonable range that balances the processing capacity and load to avoid long-term small gaps leading to low processing efficiency.

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An industrial flue gas denitration and desulfurization integrated device, comprising an absorber (1), a plurality of spray heads (2) are arranged on the absorber (1), characterized in that, The top of the gas outlet end of the absorber (1) is communicated with an upper pipe (3), the bottom of the gas outlet end of the absorber (1) is communicated with a lower pipe (4), the upper pipe (3) is arranged in an arc structure bending upward, the end of the upper pipe (3) away from the absorber (1) is provided with a rotating mesh cylinder (8), one end of the lower pipe (4) and the gas inlet end of the absorber (1) are communicated with a return air pipe (6), the return air pipe (6) is provided with a return air device group (7), the return air device group (7) is composed of a fan and a one-way valve, the bottom of the lower pipe (4) is communicated with a liquid discharge pipe (5), the upper pipe (3) is provided with an arc cavity (301) and a cylinder cavity (302), the arc cavity (301) is directly communicated with the absorber (1), the end of the upper pipe (3) away from the absorber (1) is provided with an upper pipe cover (14), one side of the top of the upper pipe cover (14) is communicated with an exhaust pipe (9), the exhaust pipe (9) is provided with a laser gas analyzer, the laser gas analyzer is used for detecting the exhaust quality, when the laser gas analyzer detects that the exhaust quality decreases, the rotating speed of the rotating mesh cylinder (8) is increased; the inner wall of the arc cavity (301) is slidably connected with two guide plates (18), the end of the guide plate (18) is connected with an arc-shaped electric guide rail (19), the guide plate (18) is provided with a guide hole (181), the top of the rotating mesh cylinder (8) is fixed with a rotating shaft (15), the top of the rotating shaft (15) is drivingly connected with a motor (16), the motor (16) is connected with a current sensor and a rotating speed sensor, the current sensor and the rotating speed sensor are used for monitoring the rotating load state of the motor (16) with the rotating mesh cylinder (8), the distance between the two guide plates (18) is controlled according to the load of the rotating mesh cylinder (8) and the exhaust quality.

2. The integrated device for flue gas denitration and desulfurization according to claim 1, characterized in that, The absorber (1) is provided with a horizontal cavity (10), a vertical cavity (11), a spraying cavity (12) and a communication cavity (13) from the gas inlet end to the gas outlet end, the end of the vertical cavity (11) away from the horizontal cavity (10) extends downward, the spraying cavity (12) is horizontally arranged, a plurality of spray heads (2) are arranged at the top of the spraying cavity (12), the bottom end inner wall of the vertical cavity (11) is above the bottom inner wall of the spraying cavity (12), the end of the return air pipe (6) connected with the absorber (1) is located at the bottom of the vertical cavity (11).

3. The integrated device for flue gas denitration and desulfurization according to claim 2, characterized in that, The communication cavity (13) vertically extends upward from the end of the spraying cavity (12), the lower pipe (4) corresponds to the bottom of the communication cavity (13), the lower pipe (4) corresponds to the opening of the spraying cavity (12), the upper pipe (3) corresponds to the top of the communication cavity (13), and the upper pipe (3) is above the spraying cavity (12).

4. The integrated device for flue gas denitration and desulfurization according to any one of claims 2 to 3, characterized in that, The lower pipe (4) is curved into an arc structure in the vertical direction, and the middle position of the lower pipe (4) is bent away from the absorber (1).

5. The integrated device for flue gas denitration and desulfurization according to any one of claims 2 to 3, characterized in that, The outer wall and the inner wall of the rotating mesh cylinder (8) are arranged in a circular truncated cone structure which is contracted upward, the top of the rotating mesh cylinder (8) is sealed, and the bottom of the rotating mesh cylinder (8) is open, the outer wall of the rotating shaft (15) is rotationally connected between the upper pipe cover (14), the inner wall of the cylinder cavity (302) is fixed with a blocking ring (17) above the rotating mesh cylinder (8).

6. The integrated device for flue gas denitration and desulfurization according to claim 5, characterized in that, The guide holes (181) are distributed in the end area of the side of the guide plate (18), and the guide holes (181) on the two guide plates (18) are located at two ends respectively, and when the two guide plates (18) overlap, the guide holes (181) are completely covered.

7. The integrated device for flue gas denitration and desulfurization according to claim 5, characterized in that, The middle position of the communication cavity (13) is rotationally provided with a shaft rod (20), one end of the shaft rod (20) is drivingly connected with a reciprocating deflection motor, the bottom of the shaft rod (20) is fixedly provided with a vertically downward lower air baffle (22), one side of the shaft rod (20) towards the spraying cavity (12) is fixedly provided with a horizontally extending upper air baffle (23), the upper air baffle (23) and the lower air baffle (22) are both provided with air holes, and the end portions of the upper air baffle (23) and the lower air baffle (22) away from the shaft rod (20) are both provided with gaps with the inner wall of the absorber (1).

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