Dedusting, desulfurization and denitrification integrated device for waste gas

Abstract

The embodiment of the invention discloses a waste gas dust removal, desulfurization and denitrification integrated device, and relates to the technical field of waste gas treatment.The integrated device comprises a dust removal tower, a desulfurization tower and a denitrification tower which are arranged from bottom to top, a circulation section is arranged on one side of the denitrification tower, and a gas inlet is formed in the position, close to the lower portion, of one side of the dust removal tower; an integrated groove is formed in the bottom of the dust removal tower. According to the waste gas dust removal, desulfurization and denitrification integrated device, by adjusting the position of the balancing weight, the opening degree of the turning plate can be automatically adjusted according to the waste gas flow, when the waste gas flow is small, the turning plate is closed due to the dead weight, and waste gas is filtered in a decelerated mode through the filtering holes; and when the waste gas flow is large, the turning plate is impacted by airflow to be lifted up, the ventilation quantity is increased, and meanwhile equipment damage caused by large-flow waste gas is prevented. By means of the design, the structure is simplified, and the self-adaptive capacity of equipment is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of waste gas treatment, and specifically to an integrated device for waste gas dust removal, desulfurization and denitrification. Background Art

[0002] With the increasing awareness of environmental protection and increasingly stringent industrial emission standards, various dust removal, desulfurization and denitrification technologies have been widely used. Traditional environmental protection equipment often relies on complex electrical control systems and mechanical equipment, which is not only costly and difficult to maintain, but also consumes a lot of energy.

[0003] The environmental protection equipment currently on the market generally has the following defects: First, the structure is complex and requires reliance on multiple sensors and electrical control systems to adjust the working status of the equipment, resulting in high installation and maintenance costs; second, the energy consumption is high. For example, the use of water pumps to maintain the circulation of desulfurization liquid or the use of screw conveyors to recover urea granules increases energy consumption; third, the equipment has poor adaptability and cannot automatically adjust the working status according to changes in exhaust gas flow and composition, resulting in unstable treatment effects.

[0004] Therefore, it is necessary to develop an environmental protection equipment with a simple structure, low energy consumption and the ability to adapt to changes in working conditions to meet increasingly stringent environmental protection requirements. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides an integrated device for waste gas dust removal, desulfurization and denitrification, so as to at least solve the technical problems of complex structure, high energy consumption and poor adaptability of current waste gas environmental protection equipment.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: An integrated device for exhaust gas dust removal, desulfurization and denitrification, comprising a dust removal tower, a desulfurization tower and a denitrification tower respectively arranged from bottom to top; An air inlet is provided at the lower part of one side of the dust removal tower, a guide cover is provided on the inner bottom side of the dust removal tower, three flaps are hinged from bottom to top on the upper part of the guide cover on the inner side of the dust removal tower, the three flaps are arranged in parallel, and the flaps are adapted to the inner size of the dust removal tower, and the surface of the flaps is densely covered with filter holes for filtering exhaust gas, a protrusion is provided at the bottom of the flap near its hinge point, one side of the protrusion is connected to a limit shaft, and a counterweight is provided on the outer transverse sliding sleeve of the limit shaft, and a flange is provided on the other side of the interior of the dust removal tower, and the flange is used to support the non-hinged end of the flap; The desulfurization tower is equipped with three filter screens in a vertical row. The three filter screens are in contact with each other end to end, and the filter screens are in a serpentine structure. The upper part of the filter screen is attached with a sponge pad, and the sponge pads are connected by drainage cotton cloth. A mesh plate is arranged obliquely at the lower part of the denitrification tower, and a plurality of ceramic plates are arranged from bottom to top above the mesh plate inside the denitrification tower, and the surfaces of the ceramic plates are densely covered with honeycomb holes.

[0007] Preferably, an integrated tank is provided at the bottom of the dust removal tower; A through slot corresponding to the integrated slot is provided at the bottom of the dust removal tower. The through slot is communicated with the inside of the air guide cover, and the air guide cover is in the shape of an inverted funnel.

[0008] Preferably, when one side of the non-hinged end of the flap is overlapped on the flange, the flap is in a horizontal state; The counterweight block can be fixed on the limiting shaft by means of bolts.

[0009] Preferably, a capillary fiber bundle is provided on one side of the top sponge pad; The outer wall of the desulfurization tower is provided with a liquid storage cavity for storing alkali solution, and the other end of the capillary fiber bundle passes through the inner wall of the desulfurization tower and is arranged in the liquid storage cavity.

[0010] Preferably, a bolt rod is rotated through one side of the liquid storage chamber, the outside of the bolt rod is located in the liquid storage chamber and is screwed with a threaded sleeve through a thread, and one end of the threaded sleeve is connected to a pressure plate that is adapted to the internal width of the liquid storage chamber.

[0011] Preferably, a storage hopper is provided on the inner wall of the denitration tower above the ceramic plate, the storage hopper is filled with urea, and a strip-shaped drop chute is provided on the lower side of the storage hopper; The ceramic plate is arranged to be tilted downward in a direction away from the storage hopper.

[0012] Preferably, a circulation section is provided on one side of the denitrification tower, and the circulation section includes: A conveying cylinder, in which an auger is rotated, a feed pipe is provided on one side of the lower end of the conveying cylinder, the other end of the feed pipe is connected to the outside of the denitrification tower and communicates with the inside of the denitrification tower, and the feed pipe is connected to the position of the mesh plate, a discharge pipe is provided on one side of the upper end of the auger, the other end of the discharge pipe is connected to the outside of the denitrification tower and communicates with the inside of the storage hopper; The shell is arranged at the upper end of the conveying cylinder, and a worm fan is rotatably arranged in the shell. The lower end of the worm fan is connected to the upper end of the auger, and an exhaust port is provided at the lower side of the shell. The upper end of the shell is provided with a conical tube connected to its interior, and the upper part of the conical tube is provided with an exhaust pipe. The other end of the exhaust pipe is provided at the top of the denitrification tower and is connected to the interior of the denitrification tower.

[0013] Preferably, the mesh plate is inclined along the direction of the feed pipe, and both sides of the mesh plate are recessed along the direction of the feed pipe, so that the urea falling onto the mesh plate slides into the conveying cylinder through the recesses.

[0014] The present invention provides an integrated device for dust removal, desulfurization and denitrification of waste gas, which has the following beneficial effects compared with the prior art: First, the integrated exhaust gas dust removal, desulfurization, and denitrification device automatically adjusts the opening degree of the flap according to the exhaust gas flow rate by adjusting the position of the counterweight. When the exhaust gas flow rate is low, the flap closes due to its own weight, and the exhaust gas passes through the filter holes at a slower speed. When the exhaust gas flow rate is high, the flap is impacted by the airflow and lifted, increasing the ventilation volume while preventing damage to the equipment caused by high exhaust gas flow. This design simplifies the structure and improves the device's adaptability.

[0015] Second, the integrated device for dust removal, desulfurization and denitrification of waste gas can automatically moisten the filter through capillary phenomenon, without relying on external water pumps and other equipment, which greatly reduces energy consumption. The capillary fiber bundles draw alkali solution from the liquid storage chamber and distribute it evenly along the surface of the filter, ensuring sufficient contact and reaction between the waste gas and the alkali solution. By turning the bolts to control the extrusion force of the capillary fiber bundles, the conduction rate of the alkali solution is adjusted, thereby achieving effective control of the desulfurization effect.

[0016] Third, in this integrated exhaust gas dust removal, desulfurization and denitrification device, urea is recycled through a gravity circulation system, reducing raw material consumption and operating costs. Urea is discharged from the storage hopper, slides onto the ceramic plate by gravity, and enters the honeycomb holes to react with NOx in the exhaust gas. The unreacted urea falls into the mesh plate, is transported upward through the conveying cylinder and auger, and then returns to the storage hopper for recycling. This process does not require complex mechanical conveying equipment.

[0017] Fourth, the integrated exhaust gas dust removal, desulfurization and denitrification device uses the airflow characteristics of the conical tube to drive the worm gear fan to rotate, and then drives the auger to lift and recover unreacted urea, realizing energy reuse. The design of the conical tube increases the flow rate when the airflow passes through, driving the worm gear fan to rotate, thereby reducing the input of external energy, simplifying the urea recovery process, and improving the operating efficiency and energy saving of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] In the attached figure: Figure 1 This is a schematic structural diagram of the integrated device for dust removal, desulfurization and denitrification of waste gas according to the present invention; Figure 2 Schematic diagram of the internal structure of the dust removal tower of the present invention; Figure 3 for Figure 2 A magnified schematic diagram of point a in the middle; Figure 4 This is a schematic diagram of the matching structure of the filter screen and the drainage cotton cloth inside the desulfurization tower of the present invention; Figure 5 Schematic diagram of the coordination between the liquid storage chamber and the capillary fiber bundle of the present invention; Figure 6 Schematic diagram of the structure of the denitration tower of the present invention; Figure 7 Schematic diagram of the coordination structure of the internal structure of the denitrification tower and the circulation section of the present invention; Figure 8 This is a schematic structural diagram of the circulation segment provided by the present invention.

[0020] In the picture: 1. Dust removal tower; 11. Air guide cover; 12. Flap; 13. Filter hole; 14. Bump; 15. Limiting shaft; 16. Counterweight; 17. Flange; 2. Desulfurization tower; 21. Filter screen; 22. Liquid storage chamber; 221. Bolt rod; 222. Threaded sleeve; 223. Pressing plate; 23. Sponge pad; 24. Drainage cotton cloth; 25. Capillary fiber bundle; 3. Denitrification tower; 31. Storage hopper; 32. Urea; 33. Ceramic plate; 34. Honeycomb hole; 35. Mesh plate; 4. Circulation section; 41. Conveying cylinder; 411. Servo motor; 42. Auger; 43. Feed pipe; 44. Discharge pipe; 45. Exhaust pipe; 46. Housing; 47. Conical pipe; 48. Exhaust port; 49. Worm fan; 5. Air intake; 6. Integrated slot; 61. Through slot. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The embodiment of the present application proposes an innovative environmental protection equipment solution, which achieves efficient dust removal, desulfurization and denitrification functions through purely mechanical structure and physical effects. It is not only simple in structure, easy to install and maintain, but also has low energy consumption and good environmental and economic benefits.

[0023] See also Figures 1-8 , the present invention provides five technical solutions: Example 1: Please refer to Figure 1 In an embodiment of the present invention, an integrated device for dust removal, desulfurization and denitrification of exhaust gas comprises a dust removal tower 1, a desulfurization tower 2 and a denitrification tower 3 respectively arranged from bottom to top; An air inlet 5 is provided at the lower part of one side of the dust removal tower 1 , and an integrated tank 6 is provided at the bottom of the dust removal tower 1 .

[0024] See also Figure 2 and Figure 3 In the embodiment of the present invention, a deflector 11 is provided on the inner bottom side of the dust removal tower 1, and three flaps 12 are hinged from bottom to top on one side of the interior of the dust removal tower 1 above the deflector 11. The three flaps 12 are arranged in parallel and adapted to the inner dimensions of the dust removal tower 1. The surface of the flap 12 is densely covered with filter holes 13 for filtering exhaust gas. A protrusion 14 is provided at the bottom of the flap 12 near its hinge point. One side of the protrusion 14 is connected to a limit shaft 15. A counterweight 16 is provided on the outer side of the limit shaft 15 for horizontal sliding. By adjusting the position of the counterweight 16, when the counterweight 16 is closer to the flange 17, the flap 12 is less likely to be knocked open by the airflow. When the counterweight 16 is further away from the flange 17, the flap 12 is more likely to be knocked open by the airflow, thereby being able to adapt to airflows of different flow rates. In some optional embodiments, a flange 17 is provided on the other side of the interior of the dust removal tower 1 at the bottom of the flap 12 , and the flange 17 is used to support the non-hinge end of the flap 12 .

[0025] In this solution, the exhaust gas enters the air inlet 5 and first enters the air deflector 11. The exhaust gas first hits the inner wall of the air deflector 11 to disperse it evenly. Some large dust particles fall into the integrated groove 6 after hitting the wall. Then the exhaust gas passes through the flap 12. The filter holes 13 on the flap 12 filter the exhaust gas. If the exhaust gas flow rate is small, the exhaust gas will be filtered through the filter holes 13 on the flap 12 at a reduced speed. If the exhaust gas flow rate is large, the filter holes 13 cannot quickly discharge the exhaust gas. The exhaust gas will hit the flap 12, and the flap 12 will rotate upward to increase the ventilation volume. The dust that hits the flap 12 will fall down, preventing the large flow of exhaust gas from damaging the flap 12. In this embodiment, by adjusting the position of the counterweight 16, when the counterweight 16 is closer to the flange 17, the flap 12 is less likely to be knocked open by the airflow, and when the counterweight 16 is farther away from the flange 17, the flap 12 is more likely to be knocked open by the airflow, thereby being able to adapt to airflows of different flow rates.

[0026] For further information, see Figure 2-Figure 3 In the embodiment of the present invention, the air guide cover 11 is in the shape of an inverted funnel, and a through groove 61 corresponding to the integrated groove 6 is provided at the bottom of the dust removal tower 1. The through groove 61 is communicated with the inside of the air guide cover 11. After the exhaust gas enters the air guide cover 11, the inverted funnel-shaped air guide cover 11 disperses the airflow so that it can be evenly dispersed to the flap 12.

[0027] For further information, see Figure 2 and Figure 3In the embodiment of the present invention, when the non-hinge end side (the side away from the hinge point) of the flap 12 is overlapped on the flange 17, the flap 12 is in a horizontal state; Optionally, the counterweight 16 can be fixed to the limiting shaft 15 by means of bolts; and by providing the flange 17 , the end of the flap 12 is supported and limited to prevent the flap 12 from rotating downward.

[0028] The difference between the second embodiment and the first embodiment is that: Figure 4 and Figure 5 In the embodiment of the present invention, three filter screens 21 are arranged in a vertical row inside the desulfurization tower 2. The three filter screens 21 are in end-to-end contact with each other, and the filter screens 21 have a serpentine structure. The filter screens 21 with a serpentine structure can slow down the flow rate of the exhaust gas, thereby ensuring the filtering quality and desulfurization effect of the exhaust gas.

[0029] In some alternative embodiments, see Figure 4 and Figure 5 In the embodiment of the present invention, a sponge pad 23 is attached to the upper part of the serpentine structure filter 21, and each sponge pad 23 is conductively connected by a drainage cotton cloth 24, and a capillary fiber bundle 25 is provided on one side of the topmost (top) sponge pad 23. The outer wall of the desulfurization tower 2 is provided with a liquid storage chamber 22 for storing alkali solution, and the other end of the capillary fiber bundle 25 passes through the inner wall of the desulfurization tower 2 and is provided in the liquid storage chamber 22.

[0030] In this scheme: after the exhaust gas is filtered, it enters the desulfurization tower 2 for desulfurization. The filter 21 in the desulfurization tower 2 further filters the exhaust gas. Under the action of capillary phenomenon, the capillary fiber bundle 25 will transfer the alkali solution in the liquid storage chamber 22 to the sponge pad 23, and the sponge pad 23 will then be transferred to the next sponge pad 23 through the drainage cotton cloth 24, so that the alkali solution can wet the entire filter 21. In this way, when the exhaust gas passes through the filter 21, the alkali solution will react with the SO2 in the exhaust gas, and the serpentine filter 21 can slow down the movement rate of the exhaust gas, so that the exhaust gas and the alkali solution are fully in contact and reacted, thereby ensuring the desulfurization effect.

[0031] The third embodiment is different from the first embodiment in that: Figure 4 and Figure 5 In the embodiment of the present invention, a bolt rod 221 is rotated through one side of the liquid storage chamber 22, and the outside of the bolt rod 221 is located in the liquid storage chamber 22 and is screwed with a threaded sleeve 222 through a thread, and one end of the threaded sleeve 222 is connected to a pressure plate 223 that is adapted to the internal width of the liquid storage chamber 22.

[0032] In this solution, an improvement is made on the basis of Example 2. By rotating the bolt rod 221, the threaded sleeve 222 is driven to move, and the threaded sleeve 222 drives the pressure plate 223 to move, so that it squeezes the capillary fiber bundle 25. By controlling its squeezing force, the rate at which the capillary fiber bundle 25 conducts the alkali solution can be controlled.

[0033] The fourth embodiment is different from the first embodiment in that: Figure 6-Figure 8 In the embodiment of the present invention, a mesh plate 35 is obliquely arranged at the lower part of the denitrification tower 3, and a plurality of ceramic plates 33 are arranged from bottom to top above the mesh plate 35 inside the denitrification tower 3. The surfaces of the ceramic plates 33 are densely covered with honeycomb holes 34. A storage hopper 31 is arranged on the inner wall of the denitrification tower 3 above the ceramic plates 33. Urea 32 is contained in the storage hopper 31, and a strip-shaped drop chute is provided on the lower side of the storage hopper 31. The ceramic plates 33 are arranged obliquely downward in a direction away from the storage hopper 31.

[0034] In this scheme, after the exhaust gas is desulfurized, it enters the denitrification tower 3. The mesh plate 35 in the denitrification tower 3 continues to filter the exhaust gas, which then passes through the ceramic plate 33 and is discharged from the honeycomb holes 34 on the ceramic plate 33. The urea 32 inside the storage hopper 31 is discharged from the chute and falls onto the ceramic plate 33. Since the ceramic plate 33 is tilted, the urea 32 can slide evenly onto the ceramic plate 33 and enter the honeycomb holes 34. At this time, the NOx in the exhaust gas reacts with the urea 32, and the high-temperature gas decomposes the catalyst coated on the inner wall of the honeycomb hole 34, accelerating the reaction rate, thereby achieving the effect of rapid denitrification. The fifth embodiment is different from the first embodiment in that: Figure 6-Figure 8 In the embodiment of the present invention, a circulation section 4 is provided on one side of the denitration tower 3, and the circulation section 4 includes a conveying cylinder 41, an auger 42 is rotatably provided in the conveying cylinder 41, and a feed pipe 43 is provided on one side of the lower end of the conveying cylinder 41, and the other end of the feed pipe 43 is connected to the outside of the denitration tower 3 and communicates with the inside of the denitration tower 3, and the feed pipe 43 is connected to the position of the mesh plate 35, and a discharge pipe 44 is provided on one side of the upper end of the auger 42, and the other end of the discharge pipe 44 is connected to the The outside is connected to the interior of the storage hopper 31, and a shell 46 is provided at the upper end of the conveying cylinder 41. A worm fan 49 is rotatably provided in the shell 46. The lower end of the worm fan 49 is connected to the upper end of the auger 42, and an exhaust port 48 is provided at the lower side of the shell 46. A conical tube 47 connected to the interior thereof is provided at the upper end of the shell 46, and an exhaust pipe 45 is provided on the upper part of the conical tube 47. The other end of the exhaust pipe 45 is provided at the top of the denitrification tower 3 and connected to the interior of the denitrification tower 3.

[0035] In one implementation, a servo motor 411 is provided at the bottom end of the conveying cylinder 41. The servo motor 411 is electrically connected to a speed sensor provided on the worm gear fan 49. During the exhaust gas treatment process, the speed sensor is used to detect the speed of the worm gear fan 49 in real time. When the speed of the worm gear fan 49 is lower than a set threshold or the worm gear fan 49 does not rotate continuously within a certain period of time, the servo motor 411 can be controlled to start and intervene to drive the auger 42 to rotate, so as to ensure that the auger 42 does not stop rotating for a long time. The rotation of the auger 42 transports the unreacted urea 32 upward, and then enters the storage hopper 31 through the discharge pipe 44, so that the urea 32 is recycled. In this solution, on the basis of Example 4, the unreacted urea 32 is recycled. After the desulfurization of the exhaust gas is completed, it enters the denitrification tower 3. The mesh plate 35 in the denitrification tower 3 continues to filter the exhaust gas, and then passes through the ceramic plate 33 and is discharged from the honeycomb hole 34 on the ceramic plate 33. The urea 32 inside the storage hopper 31 will be discharged from the chute and fall onto the ceramic plate 33. Since the ceramic plate 33 is set at an angle, the urea 32 can slide evenly onto the ceramic plate 33 and enter the honeycomb hole 34. At this time, the NOx in the exhaust gas reacts with the urea 32, and the high-temperature gas decomposes the catalyst coated on the inner wall of the honeycomb hole 34, accelerating the reaction rate, thereby achieving the effect of rapid denitrification.

[0036] For further information, see Figure 6-Figure 8 In this embodiment, the mesh plate 35 is inclined along the direction of the feed pipe 43, and both sides of the mesh plate 35 are recessed along the direction of the feed pipe 43, so that the urea 32 falling on the mesh plate 35 slides into the conveying cylinder 41 through the recess.

[0037] In combination with the above embodiments, the entire working principle of the integrated device for exhaust gas dust removal, desulfurization and denitrification of the present invention is explained: In the exhaust gas filtration stage, the exhaust gas enters from the air inlet 5 and first enters the deflector 11. The exhaust gas first hits the inner wall of the deflector 11 to disperse it evenly. After some large dust particles are hit, they fall into the integrated tank 6. Then the exhaust gas passes through the flap 12. The filter holes 13 on the flap 12 filter the exhaust gas. If the exhaust gas flow rate is small, the exhaust gas will be filtered through the filter holes 13 on the flap 12 at a reduced speed. If the exhaust gas flow rate is large, the filter holes 13 cannot quickly discharge the exhaust gas. The exhaust gas will hit the flap 12, and the flap 12 will rotate upward to increase the ventilation volume. The dust that hits the flap 12 will fall down to prevent the large flow of exhaust gas from damaging the flap 12. By adjusting the position of the counterweight 16, when the counterweight 16 is closer to the flange 17, the flap 12 is less likely to be knocked open by the airflow. When the counterweight 16 is farther away from the flange 17, the flap 12 is more likely to be knocked open by the airflow, thereby being able to adapt to different airflows. In the exhaust gas desulfurization stage, the exhaust gas enters the desulfurization tower 2 for desulfurization after filtration. The filter screen 21 in the desulfurization tower 2 further filters the exhaust gas. Under the action of capillary phenomenon, the capillary fiber bundle 25 will conduct the alkali solution in the liquid storage chamber 22 to the sponge pad 23, and the sponge pad 23 will then conduct it to the next sponge pad 23 through the drainage cotton cloth 24, so that the alkali solution can wet the entire filter screen 21. In this way, when the exhaust gas passes through the filter screen 21, the alkali solution will react with SO2 in the exhaust gas, and the serpentine filter screen 21 can slow down the movement rate of the exhaust gas, so that the exhaust gas and the alkali solution can fully contact and react, thereby ensuring the desulfurization effect. By rotating the bolt rod 221, the threaded sleeve 222 is driven to move, and the threaded sleeve 222 drives the pressure plate 223 to move, so that it squeezes the capillary fiber bundle 25. By controlling its squeezing force, the rate at which the capillary fiber bundle 25 conducts the alkali solution can be controlled; In the exhaust gas denitrification stage, after the exhaust gas is desulfurized, it enters the denitrification tower 3. The mesh plate 35 in the denitrification tower 3 continues to filter the exhaust gas, and then passes through the ceramic plate 33 and is discharged from the honeycomb holes 34 on the ceramic plate 33. The urea 32 inside the storage hopper 31 is discharged from the chute and falls onto the ceramic plate 33. Since the ceramic plate 33 is set at an angle, the urea 32 can slide evenly onto the ceramic plate 33 and enter the honeycomb holes 34. At this time, the NOx in the exhaust gas reacts with the urea 32, and the high-temperature gas decomposes the catalyst coated on the inner wall of the honeycomb hole 34, accelerating the reaction rate, thereby achieving the effect of rapid denitrification; In addition, the unreacted urea 32 falls into the mesh plate 35 and enters the conveying cylinder 41 through the feed pipe 43. The denitrified gas is discharged from the exhaust pipe 45 and enters the shell 46. Since the conical tube 47 is wide at the top and narrow at the bottom, the flow rate increases when the air flow passes through the conical tube 47. The flow rate of the gas will drive the rotation of the worm gear fan 49, and the worm gear fan 49 will drive the auger 42 to rotate. The auger 42 will transport the unreacted urea 32 upward, and then enter the storage hopper 31 through the discharge pipe 44, so that the urea 32 can be recycled.

[0038] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0039] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An integrated device for removing dust, desulfurizing and denitrifying waste gas, comprising a dust removal tower (1), a desulfurization tower (2) and a denitrification tower (3) arranged from bottom to top; characterized in that ； An air inlet (5) is provided at the lower part of one side of the dust removal tower (1), a guide cover (11) is provided at the inner bottom side of the dust removal tower (1), three flaps (12) are hinged from bottom to top at the upper part of the guide cover (11) on the inner side of the dust removal tower (1), the three flaps (12) are arranged in parallel, the flaps (12) are adapted to the inner size of the dust removal tower (1), the surface of the flaps (12) is densely covered with filter holes (13) for filtering exhaust gas, a protrusion (14) is provided at the bottom of the flap (12) near its hinge point, one side of the protrusion (14) is connected to a limit shaft (15), the outer lateral sliding sleeve of the limit shaft (15) is provided with a counterweight (16), and a flange (17) is provided on the other side of the inner part of the dust removal tower (1), and the flange (17) is used to support the non-hinged end of the flap (12); Three filter screens (21) are arranged in a longitudinal row inside the desulfurization tower (2). The three filter screens (21) are in end-to-end contact with each other and have a serpentine structure. A sponge pad (23) is attached to the upper part of the filter screen (21). The sponge pads (23) are conductively connected by drainage cotton cloth (24). A mesh plate (35) is obliquely arranged at the lower portion of the denitration tower (3). A plurality of ceramic plates (33) are arranged from bottom to top above the mesh plate (35) in the denitration tower (3). The surfaces of the ceramic plates (33) are densely covered with honeycomb holes (34).

2. The integrated device for dust removal, desulfurization and denitrification of waste gas according to claim 1, characterized in that: An integrated trough (6) is provided at the bottom of the dust removal tower (1); A through groove (61) corresponding to the integrated groove (6) is provided at the bottom of the dust removal tower (1). The through groove (61) is communicated with the interior of the flow guide cover (11), and the flow guide cover (11) is in the shape of an inverted funnel.

3. The integrated device for dust removal, desulfurization and denitrification of waste gas according to claim 2, characterized in that: When one side of the non-hinged end of the flap (12) is overlapped on the flange (17), the flap (12) is in a horizontal state; The counterweight (16) can be fixed on the limiting shaft (15) by means of bolts.

4. The integrated device for dust removal, desulfurization and denitrification of waste gas according to claim 3, characterized in that: A capillary fiber bundle (25) is provided on one side of the top sponge pad (23); The outer wall of the desulfurization tower (2) is provided with a liquid storage chamber (22) for storing alkali solution, and the other end of the capillary fiber bundle (25) passes through the inner wall of the desulfurization tower (2) and is arranged in the liquid storage chamber (22).

5. The integrated device for dust removal, desulfurization and denitrification of waste gas according to claim 4, characterized in that: A bolt rod (221) is rotated through one side of the liquid storage chamber (22), and the outside of the bolt rod (221) is located in the liquid storage chamber (22) and is screwed with a threaded sleeve (222) through a thread, and one end of the threaded sleeve (222) is connected to a pressure plate (223) that is adapted to the internal width of the liquid storage chamber (22).

6. The integrated device for dust removal, desulfurization and denitrification of waste gas according to claim 5, characterized in that: A storage hopper (31) is provided on the inner wall of the denitration tower (3) above the ceramic plate (33), urea (32) is contained in the storage hopper (31), and a strip-shaped drop chute is provided on the lower side of the storage hopper (31); The ceramic plate (33) is arranged to be tilted downward in a direction away from the storage hopper (31).

7. The integrated device for dust removal, desulfurization and denitrification of waste gas according to claim 6, characterized in that: A circulation section (4) is provided on one side of the denitration tower (3), and the circulation section (4) includes: A conveying cylinder (41) is provided with an auger (42) which is rotatably arranged in the conveying cylinder (41). A feed pipe (43) is provided on one side of the lower end of the conveying cylinder (41). The other end of the feed pipe (43) is connected to the outside of the denitrification tower (3) and communicates with the inside of the denitrification tower (3). The feed pipe (43) is connected to the position of the mesh plate (35). A discharge pipe (44) is provided on one side of the upper end of the auger (42). The other end of the discharge pipe (44) is connected to the outside of the denitrification tower (3) and communicates with the inside of the storage hopper (31). The housing (46) is provided at the upper end of the conveying cylinder (41), a worm fan (49) is rotatably provided in the housing (46), the lower end of the worm fan (49) is connected to the upper end of the auger (42), and an exhaust port (48) is provided at the lower side of the housing (46), a conical tube (47) communicating with the interior thereof is provided at the upper end of the housing (46), an exhaust pipe (45) is provided at the upper portion of the conical tube (47), and the other end of the exhaust pipe (45) is provided at the top of the denitrification tower (3) and communicates with the interior of the denitrification tower (3).

8. The integrated device for dust removal, desulfurization and denitrification of waste gas according to claim 7, characterized in that: The mesh plate (35) is inclined in the direction of the feed pipe (43), and both sides of the mesh plate (35) are recessed in the direction of the feed pipe (43). Urea (32) falling onto the mesh plate (35) slides into the conveying cylinder (41) through the recesses.

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