Aluminum fluoride tail gas desulfurization and denitrification system and denitrification method

Abstract

The invention discloses an aluminum fluoride tail gas desulfurization and denitrification system, which effectively realizes the purpose of more uniform scattering process of wastewater, and comprises a feeding module; a drying tower comprises a tower body, a hot air distributor, an atomizer, an observation manhole, an in-tower lighting module and a pneumatic knocking hammer, and a scattering frame is arranged on the lower side of the atomizer. An air heating module; the first-stage cyclone separator is connected with the second-stage cyclone separator; a waste gas treatment module; the invention also discloses an aluminum fluoride tail gas denitration method. The method comprises the following steps: S1, feeding wastewater; step S2, atomization of the wastewater; s3, solidifying the wastewater microdroplets; s4, treating dry tail gas in the tower body; the device is novel in structure, ingenious in conception and easy and convenient to operate, dried solid particles are effectively and conveniently collected, the atomization effect of waste liquid during atomization is improved, the device can adapt to different atomization liquid inlet amounts, and the function of adjusting the atomization effect in the atomization process is added.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical production, and relates to an aluminum fluoride tail gas desulfurization and denitration system and a denitration method. Background Art

[0002] In the prior art, aluminum fluoride is usually prepared by reacting hydrogen fluoride gas produced by the reaction of fluorite and sulfuric acid with aluminum hydroxide in a fluidized bed. However, tail gas is produced in the preparation process of aluminum fluoride, and its main components are water, H2SO4 acid mist, a small amount of SO2 and particulate matter, etc. The tail gas is generally desulfurized by a double alkali method. During the desulfurization process, NOx in the tail gas is removed at the same time, and nitrates and nitrites are formed in the desulfurization circulating liquid. However, nitrates are easily soluble in water and are not easy to be converted into precipitation for removal. After long-term circulation absorption, when the concentration reaches saturation, NOx can no longer be absorbed, which has a great impact on the absorption effect of NOx.

[0003] A patent document with application number CN201720325372.0 was retrieved, which discloses a spray drying tower, including a drying tower body, a discharging device and a feeding device, wherein the discharging device and the feeding device are both connected to the drying tower body, and also include an air filter and a freezer, wherein the freezer, the air filter and the discharging device are sequentially connected through a first pipe. A spray drying tower of the utility model reduces the probability of material agglomeration, improves production efficiency, reduces losses, and shortens the production cycle by adding a freezer and an air filter; an atomizer is provided to atomize the air, and the liquid feed can be conveniently dried into dry powder in a very short time; an electric hoist is provided to hang the atomizer, and it is convenient to maintain and clean the atomizing disk; a hot air inlet fan is provided to rotate and draw the heated air into the tower through a distributor; a steam heating device and an electric heating wire are provided to heat the air and enter the tower to dry the liquid feed;

[0004] In addition, a patent document with application number CN201420845996.1 was retrieved, which discloses an energy-saving spray drying system, including a drying tower and a cyclone separator. The drying tower is provided with a high-speed atomizer, which is connected to the feed port, and is characterized in that: the drying tower is provided with a hot air distributor and a purge pipe, the hot air distributor is connected to the heater and the air inlet, the purge pipe is connected to the high-pressure air inlet, one side of the cyclone separator is connected to the conical bottom of the drying tower, and the other side is connected to the bag filter, the cyclone separator and the bag filter are both provided with a recovery fan connected to the hot air distributor, and an air dehumidifier is also provided between the recovery fan and the hot air distributor. The utility model adopts a cyclone separator and a bag filter in combination with a drying tower, which can fully dry the product, and further upgrade the product quality to supply users with high-end requirements; in addition, the cyclone separator and the bag filter are both provided with a recovery fan connected to the hot air distributor, which is energy-saving, environmentally friendly and effectively controls costs;

[0005] However, the above patent documents all have deficiencies in the atomization stage of the waste liquid. During the treatment of the wastewater, the concentration of its internal impurities will change to a certain extent, which will affect the viscosity of the wastewater and further affect the atomization effect of the wastewater. During the hot air drying process, it will affect the drying efficiency. Therefore, an aluminum fluoride tail gas desulfurization and denitrification system and denitrification method that can maintain stable atomization efficiency is needed to solve the above problems. Summary of the invention

[0006] In view of the above problems, the present invention proposes an aluminum fluoride tail gas desulfurization and denitrification system and a denitrification method, which well solve the problems in the prior art.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] An aluminum fluoride tail gas desulfurization and denitrification system, comprising:

[0009] A feeding module, used for conveying wastewater to be dried;

[0010] A drying tower is used to atomize and dry wastewater to dry the solid solution in the wastewater into powder, comprising a tower body, a hot air distributor, an atomizer, an observation manhole, an internal lighting module, and a pneumatic percussion hammer. The hot air distributor is connected to the top of the tower body, the atomizer is located on the upper side of the tower body, the upper side of the atomizer is connected to the feeding module, and the lower side of the atomizer is provided with a disintegrating frame that can rotate with the atomizer.

[0011] An air heating module, connected to the hot air distributor, for conveying dry hot air to the interior of the drying tower;

[0012] A primary cyclone separator and a secondary cyclone separator, wherein the primary cyclone separator is connected to the bottom of the drying tower, and the feed end of the secondary cyclone separator is connected to the air outlet end of the primary cyclone separator;

[0013] The exhaust gas treatment module includes a water spray device and a spray pool.

[0014] Preferably, the tower body comprises a top plate, a circular cylinder and a conical cylinder from top to bottom, the atomizer is provided with a cleaning port on the lower side of the top plate and the lower side of the conical cylinder, the pneumatic percussion hammer is installed at the connection between the circular cylinder and the conical cylinder, and the observation manhole and the lighting module in the tower are both arranged on the circular cylinder.

[0015] Preferably, the atomizer includes a rotatable atomizing disk and an adjusting frame that can move up and down along the atomizing disk, a plurality of first drainage strips are fixedly connected to the lower side of the atomizing disk, a plurality of second drainage strips are fixedly connected to the lower side of the adjusting frame, and the first drainage strips and the second drainage strips cooperate with each other to form a structure for dispersing wastewater droplets.

[0016] Preferably, a rotating frame is rotatably connected to the outer side of the atomizing disk, and the adjusting frame is threadedly sleeved on the outer side of the rotating frame, and the rotating frame rotates to form a lifting structure of the adjusting frame.

[0017] Preferably, the upper side of the atomizing disk is connected to a feeding sleeve, the top of the feeding sleeve is fixedly connected to a first bevel gear ring, the upper side of the first bevel gear ring is meshed with a first bevel gear rotatably connected to the top plate, a power motor is provided on the front side of the first bevel gear, and the output end of the power motor is fixedly connected to the first bevel gear.

[0018] Preferably, a sun gear is fixedly connected to the upper side of the atomizing disk, an outer gear ring is fixedly connected to the inner side of the rotating frame, a plurality of planetary gears are meshed between the sun gear and the outer gear ring, the upper side of the sun gear is rotatably connected to a planetary frame, and the upper side of each planetary gear is rotatably connected to the planetary frame.

[0019] Preferably, a third bevel gear ring is fixedly connected to the upper side of the planetary carrier, and the upper side of the third bevel gear ring is meshed with a second bevel gear and a third bevel gear, an adjusting motor fixedly connected to the unloading sleeve is provided on the rear side of the second bevel gear, and the output end of the adjusting motor is fixedly connected to the second bevel gear, and a counterweight block is provided on the front side of the third bevel gear, and the front side of the counterweight block is rotatably connected to the unloading sleeve.

[0020] Preferably, a large turntable is fixedly connected to the upper side of the atomizing sleeve, a power ring rotatably connected to the top plate is fixedly connected to the upper side of the disintegration frame, a connecting rod that can move up and down is provided between the power ring and the large turntable, the outer sliding sleeve of the connecting rod has a rotating disk, and the lower side of the rotating disk is provided with two fixed plates fixedly connected to the connecting rod, a tension spring is provided on the upper side of each fixed plate, and the upper side of each tension spring is fixedly connected to the fixed plate, the large turntable, the rotating disk and the power ring cooperate with each other to form a structure in which the disintegration frame rotates together with the atomizing disk, the upper side of the connecting rod is rotatably connected to a connecting block, and the upper side of the connecting block is provided with an electric telescopic rod.

[0021] Preferably, the dispersing frame comprises a plurality of first dispersing plates fixedly connected to each other at the bottom, and a plurality of second dispersing plates are arranged between every two adjacent first dispersing plates.

[0022] The present invention also discloses a method for denitrification of aluminum fluoride tail gas, comprising the following steps:

[0023] Step S1: wastewater feeding, the high-concentration salt-containing wastewater in the circulating water pool of the desulfurization and denitrification device is pumped to the water inlet pool of the drying and reuse device through a screw pump for temporary storage, and then pumped into the high-level tank of the drying tower. The screw pump adopts variable frequency speed regulation to effectively control the feed amount;

[0024] Step S2: atomization of wastewater. Under the action of gravity, the wastewater in the high-level tank of the drying tower naturally flows from the high-level tank through the outlet pipe into the center of the atomizer inside the tower body. The atomizer drives the wastewater droplets to rotate at a high speed of 11600r / min, accelerates the wastewater droplets, and makes the wastewater droplets obtain a very high tangential linear velocity. When the wastewater droplets leave the atomizer, they are immediately rubbed and torn by the air and atomized into wastewater droplets.

[0025] When the atomizer is started, the breaking frame can be rotated in the opposite direction of the atomizer to break up the larger wastewater droplets for a second time.

[0026] Step S3: solidification of wastewater droplets. The hot air discharged from the air heating module is sent to the hot air distribution chamber at the top of the tower body through the hot air duct, and contacts with the wastewater droplets in a downstream manner to dry the solid solution in the wastewater into powder, which falls to the lower part of the tower body.

[0027] Step S4: Treatment of dry tail gas in the tower body. The dry tail gas is discharged from the exhaust port located at the lower part of the tower body through the first-stage cyclone separator and the second-stage cyclone separator in turn to recover fine powder. The tail gas discharged from the second cyclone separator is then treated by the water spray device and discharged through a 30m high exhaust stack; the water vapor in the dry tail gas is condensed and enters the circulating water pool of the water spray device, and then pumped into the circulating water pool of the desulfurization and denitrification device for reuse.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention has an atomizer capable of adjusting the atomization effect, can better atomize wastewater, and can adapt to atomization of wastewater with different viscosities, thereby improving the stability of atomization.

[0030] 2. The present invention has a primary cyclone separator and a secondary cyclone separator. The two-stage cyclone separator can recover fine powder, thereby recovering the material more thoroughly and increasing the recovery rate.

[0031] 3. The present invention has a first drainage strip and a second drainage strip, which can drain the droplets thrown out from all sides of the atomizing disk, that is, through the action of the first drainage strip and the second drainage strip, the contact area of ​​the droplets when leaving the atomizing disk is reduced, thereby reducing the size of the droplets thrown out. When the liquid inlet amount of the atomizer is small, the droplets can be drained only through the first drainage strip. When the liquid inlet amount increases, the second drainage strip can be extended from the lower part of the atomizing disk to improve the drainage efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the denitration system in the present invention.

[0033] Figure 2 It is a structural schematic diagram of the tower body in the present invention.

[0034] Figure 3 It is a schematic diagram of the position of the power motor in the present invention.

[0035] Figure 4 It is a schematic diagram of the position of the tension spring in the present invention.

[0036] Figure 5 It is a schematic diagram of the dismantling structure in the present invention.

[0037] Figure 6 It is a schematic structural diagram of the planet carrier in the present invention.

[0038] Figure 7 It is a schematic diagram of the exploded structure of the atomizing disk and the adjusting frame in the present invention.

[0039] In the figure: 1. Feeding module; 2. Tower body; 3. Hot air distributor; 4. Atomizer; 5. Observation manhole; 6. Breaking frame; 7. Air heating module; 8. Primary cyclone separator; 9. Secondary cyclone separator; 10. Waste gas treatment module; 11. Top plate; 12. Round cylinder; 13. Conical cylinder; 14. Cleaning port; 15. Atomizing disk; 16. Adjusting frame; 17. First drainage strip; 18. Second drainage strip; 19. Rotating frame; 20. Unloading sleeve; 21. First cone gear ring ; 22. first bevel gear; 23. power motor; 24. sun gear; 25. outer gear ring; 26. planetary gear; 27. planetary carrier; 28. third bevel gear ring; 29. ​​second bevel gear; 30. third bevel gear; 31. adjustment motor; 32. counterweight; 33. large turntable; 34. power ring; 35. connecting rod; 36. rotating disk; 37. fixed plate; 38. tension spring; 39. connecting block; 40. electric telescopic rod; 41. first scattering plate; 42. second scattering plate. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0041] The following is combined with Figure 1 - Figure 7 The specific implementation modes of the present invention are described in further detail.

[0042] Depend on Figure 1 - Figure 7 Provided is an aluminum fluoride tail gas desulfurization and denitrification system. In order to make the wastewater dispersion process more uniform, the present invention comprises:

[0043] Feed module 1 is used to transport the wastewater to be dried; the high-concentration salt-containing wastewater in the circulating water pool of the desulfurization and denitrification device is pumped to the water inlet pool of the drying and reuse device for temporary storage, and then pumped into the high-level tank of the drying tower. The screw pump adopts variable frequency speed regulation to effectively control the feed amount;

[0044] A drying tower is used to atomize and dry wastewater to dry the solid solution in the wastewater into powder, comprising a tower body 2, a hot air distributor 3, an atomizer 4, an observation manhole 5, an in-tower lighting module, and a pneumatic percussion hammer. The hot air distributor 3 is connected to the top of the tower body 2, the atomizer 4 is located on the upper side of the inside of the tower body 2, the upper side of the atomizer 4 is connected to the feeding module 1, and the lower side of the atomizer 4 is provided with a disintegration frame 6 that can rotate with the atomizer 4;

[0045] It should be noted that the principle of the atomizer 4 is a centrifugal disc atomizer 4. The atomizer 4 is installed in the upper part of the tower body 2. The high-concentration salt-containing wastewater of desulfurization and denitration in the high-level tank flows naturally from the high-level tank through the outlet pipe into the center of the centrifugal disc atomizer 4 in the tower under the action of gravity. The centrifugal disc rotates at a high speed of 11600r / min driven by the motor. When the wastewater flows to the edge through the grooves or spray holes on the centrifugal disc, it obtains a very high tangential linear velocity. Once it leaves the atomizer 4, it is immediately rubbed and torn by the air and atomized into droplets. When different impurities are mixed in the wastewater, it will affect the viscosity of the wastewater, and then affect the size of the atomized droplets of the wastewater. When the atomization effect is poor, the scattering frame 6 can be started. The scattering frame 6 rotates in the opposite direction to the atomizer 4, and can mechanically scatter larger atomized droplets, and then when the viscosity of the wastewater increases, the atomization effect is guaranteed.

[0046] The air heating module 7 is connected to the hot air distributor 3 and is used to transport dry hot air to the inside of the drying tower;

[0047] It should be noted that the air heating module 7 is composed of a primary air filter, a medium-efficiency air filter, a fan, and a heater. The heat source is the indirect heating tail gas between the jackets of the hydrogen fluoride reaction kiln of the project, with a temperature of 260°C ± 10°C and a hot gas volume of 25000m3 / h-27000m3 / h. The hot air discharged from the air heating module 7 is sent to the hot air distribution chamber at the top of the tower body 2 through the hot air duct, and contacts with the atomized wastewater droplets in a downstream manner, and the solid solution in the wastewater is dried into powder, which falls on the lower part of the tower body 2;

[0048] A primary cyclone separator 8 and a secondary cyclone separator 9, wherein the primary cyclone separator 8 is connected to the bottom of the drying tower, and the feed end of the secondary cyclone separator 9 is connected to the air outlet end of the primary cyclone separator 8;

[0049] The exhaust gas treatment module 10 includes a water spray device and a spray pool;

[0050] It should be noted that the dry exhaust gas discharged from the tower body 2 is recovered through the two-stage cyclone separators of the primary cyclone separator 8 and the secondary cyclone separator 9 to recover fine powder, and the exhaust gas is then treated by the water spray device and discharged through a 30m high exhaust chimney; the water vapor in the dry exhaust gas is condensed and enters the circulating water pool of the water spray device, and then pumped into the circulating water pool of the desulfurization and denitrification device for reuse.

[0051] Further, by Figure 1 - Figure 7 It is given that, in order to facilitate the collection of the dried solid particles, the tower body 2 includes a top plate 11, a circular cylinder 12 and a conical cylinder 13 from top to bottom, the atomizer 4 is provided with a cleaning port 14 on the lower side of the top plate 11 and the lower side of the conical cylinder 13, the pneumatic percussion hammer is installed at the connection between the circular cylinder 12 and the conical cylinder 13, and the observation manhole 5 and the lighting module in the tower are both arranged on the circular cylinder 12;

[0052] When in use, when the solid solution in the wastewater dries into powder and falls into the conical cylinder 13 at the bottom of the tower body 2, the powder can be collected through the cleaning port 14. In addition, when too much material accumulates on the inner walls of the circular cylinder 12 and the conical cylinder 13, a pneumatic hammer can be started to clear the material on the side wall.

[0053] Further, by Figure 1 - Figure 7 It is given that in order to increase the atomization effect of the waste liquid during atomization, the atomizer 4 includes a rotatable atomization disk 15 and an adjustment frame 16 that can move up and down along the atomization disk 15, the atomization disk 15 is in an inverted concave shape, a plurality of first drainage strips 17 are fixedly connected to the lower side of the atomization disk 15, and a plurality of second drainage strips 18 are fixedly connected to the lower side of the adjustment frame 16, and the first drainage strips 17 and the second drainage strips 18 cooperate with each other to form a structure for dispersing wastewater droplets;

[0054] When in use, under the action of the first drainage strip 17 and the second drainage strip 18, the droplets thrown out from the four sides of the atomizing disk 15 can be drained, that is, through the action of the first drainage strip 17 and the second drainage strip 18, the contact area of ​​the droplets when leaving the atomizing disk 15 is reduced, thereby reducing the size of the droplets thrown out. When the liquid inlet amount of the atomizer 4 is small, the droplets can be drained through the first drainage strip 17. When the liquid inlet amount increases, the adjustment frame 16 can be moved downward. At this time, the second drainage strip 18 extends from the lower part of the atomizing disk 15 to improve the drainage efficiency.

[0055] Further, by Figure 1 - Figure 7 It is given that, in order to adapt to different atomization liquid inflow amounts, the outer side of the atomization disk 15 is rotatably connected to a rotating frame 19, and the adjusting frame 16 is threadedly sleeved on the outer side of the rotating frame 19, and the rotating frame 19 rotates to form a lifting structure of the adjusting frame 16;

[0056] Further, by Figure 1 - Figure 7 It is given that, in order to facilitate the atomization operation, a feeding sleeve 20 is connected to the upper side of the atomizing disk 15, and a first bevel gear ring 21 is fixedly connected to the top of the feeding sleeve 20. A first bevel gear ring 22 is meshed with the upper side of the first bevel gear ring 21 and is rotatably connected to the top plate 11. A power motor 23 is provided on the front side of the first bevel gear 22. The power motor 23 is a servo motor, which is a prior art and will not be described in detail here. The output end of the power motor 23 is fixedly connected to the first bevel gear 22;

[0057] During use, after starting the power motor 23, the power motor 23 drives the first bevel gear ring 21 to rotate through the first bevel gear 22, and then drives the atomizing disk 15 to rotate through the unloading sleeve 20. It should be understood that a unloading hole is provided in the middle of the atomizing disk 15 and is connected to the unloading sleeve 20. When liquid is unloaded in the unloading sleeve 20, the waste liquid enters the bottom of the atomizing disk 15 through the side wall of the unloading sleeve 20.

[0058] Further, by Figure 1 - Figure 7 It is given that, in order to be able to quickly extend the second drain strip 18, a sun gear 24 is fixedly connected to the upper side of the atomizing disk 15, an outer gear ring 25 is fixedly connected to the inner side of the rotating frame 19, a plurality of planetary gears 26 are meshed between the sun gear 24 and the outer gear ring 25, a planetary carrier 27 is rotatably connected to the upper side of the sun gear 24, and the upper side of each of the planetary gears 26 is rotatably connected to the planetary carrier 27;

[0059] When in use, during the normal atomization process, there is no relative displacement between the sun gear 24, the planetary gears 26, the outer gear ring 25 and the planetary carrier 27. When the rotating frame 19 needs to be rotated relative to the atomizing disk 15, that is, when the second drainage strip 18 needs to be extended, the planetary carrier 27 can be rotated, with the sun gear 24 as the reference system. At this time, the planetary carrier 27 drives the outer gear ring 25 to rotate through each planetary gear 26. Due to the meshing effect of the planetary gears 26 and the sun gear 24, that is, the rotation of the planetary carrier 27 has an accelerating effect relative to the rotation of the outer gear ring 25, the rotating frame 19 can be rotated quickly to extend the second drainage strip 18.

[0060] Further, by Figure 1 - Figure 7It is given that, in order to be able to adjust the atomization effect during the atomization process, a third bevel gear ring 28 is fixedly connected to the upper side of the planetary carrier 27, and a second bevel gear 29 and a third bevel gear 30 are meshed on the upper side of the third bevel gear ring 28. An adjusting motor 31 fixedly connected to the blanking sleeve 20 is provided on the rear side of the second bevel gear 29. The adjusting motor 31 is a servo motor and is equipped with an encoder, which can monitor the rotation angle of the servo motor. No more description is given here. The output end of the adjusting motor 31 is fixedly connected to the second bevel gear 29, and a counterweight 32 is provided on the front side of the third bevel gear 30. The counterweight 32 is used to adjust the dynamic balance of the adjusting motor 31 to make the rotation process of the atomizer 4 more stable. The third bevel gear 30 can make the rotation process of the third bevel gear ring 28 relative to the blanking sleeve 20 more stable, and the front side of the counterweight 32 is rotatably connected to the blanking sleeve 20;

[0061] Further, by Figure 1 - Figure 7 It is given that in order to automatically improve the atomization effect, a large turntable 33 is fixedly connected to the upper side of the atomizing sleeve, a power ring 34 rotatably connected to the top plate 11 is fixedly connected to the upper side of the disintegrating frame 6, a connecting rod 35 that can move up and down is provided between the power ring 34 and the large turntable 33, the outer sliding sleeve of the connecting rod 35 has a rotating disk 36, and the lower side of the rotating disk 36 is provided with two fixed plates 37 fixedly connected to the connecting rod 35, each fixed plate 37 has a tension spring 38 on the upper side, and the upper side of each tension spring 38 is fixedly connected to the fixed plate 37, the large turntable 33 and the rotating disk 36, the power ring 34 cooperate with each other to form a structure in which the disintegrating frame 6 rotates together with the atomizing disk 15, the upper side of the connecting rod 35 is rotatably connected to a connecting block 39, and the upper side of the connecting block 39 is provided with an electric telescopic rod 40;

[0062] It should be noted that a distance sensor is provided at the moving end of the electric telescopic rod 40, and the distance sensor is electrically connected to the adjustment motor 31, that is, the extension distance of the electric telescopic rod 40 corresponds to the rotation angle of the adjustment motor 31 one by one;

[0063] During use, when it is necessary to improve the atomization effect, the electric telescopic rod 40 can be started to drive the connecting rod 35 to move downward through the rotating disk 36. As the connecting rod 35 drives the rotating disk 36 to move continuously downward, the rotating disk 36 will contact the outer side of the large turntable 33 and the inner side of the power ring 34. As the connecting rod 35 moves further downward, under the action of the rotating disk 36, the rotational power of the large turntable 33 is transmitted to the power disk through the rotating disk 36, thereby driving the shattering frame 6 to rotate and mechanically shattering larger droplets. At this time, under the action of the stored force of the tension spring 38, the connecting rod 35 can continue to extend further with the electric telescopic rod 40, making the power transmission more stable. When the electric telescopic rod 40 is extended, the adjusting motor 31 will drive the second bevel gear 29 to rotate. At this time, with the unloading sleeve 20 as the reference system, the second bevel gear 29 drives the third bevel gear ring 28 to rotate relative to the unloading sleeve 20, thereby driving the planetary carrier 27 to rotate.

[0064] Further, by Figure 1 - Figure 7 It is given that, in order to achieve a better breaking effect on the wastewater droplets, the breaking frame 6 includes a plurality of first breaking plates 41 fixedly connected to each other at the bottom, and a plurality of second breaking plates 42 are arranged between every two adjacent first breaking plates 41;

[0065] When in use, the first breaking up plate 41 and the second breaking up plate 42 can improve the breaking up efficiency of the droplets.

[0066] A method for denitrification of aluminum fluoride tail gas comprises the following steps:

[0067] Step S1: wastewater feeding, the high-concentration salt-containing wastewater in the circulating water pool of the desulfurization and denitrification device is pumped to the water inlet pool of the drying and reuse device through a screw pump for temporary storage, and then pumped into the high-level tank of the drying tower. The screw pump adopts variable frequency speed regulation to effectively control the feed amount;

[0068] Step S2: atomization of wastewater. Under the action of gravity, the wastewater in the high-level tank of the drying tower naturally flows from the high-level tank through the outlet pipe into the center of the tower body 2, which is the atomizer 4. The atomizer 4 drives the wastewater droplets to rotate at a high speed of 11600r / min, accelerates the wastewater droplets, and makes the wastewater droplets obtain a very high tangential linear velocity. When the wastewater droplets leave the atomizer 4, they are immediately rubbed and torn by the air and atomized into wastewater droplets.

[0069] When the atomizer 4 is started, the breaking frame 6 can be rotated in the opposite direction of the atomizer 4 to break up the larger wastewater droplets for a second time;

[0070] Step S3: solidification of wastewater droplets. The hot air discharged from the air heating module 7 is sent to the hot air distribution chamber at the top of the tower body 2 through the hot air duct, and contacts with the wastewater droplets in a downstream manner to dry the solid solution in the wastewater into powder, which falls to the lower part of the tower body 2. The heat source of the hot air is the indirect heating tail gas between the jackets of the hydrogen fluoride reaction kiln, the temperature is 260℃±10℃, and the hot air volume is 25000m3 / h-27000m3 / h;

[0071] Step S4: Treatment of the dry tail gas in the tower body 2. The dry tail gas is discharged from the exhaust port located at the lower part of the tower body 2 through the first-stage cyclone separator 8 and the second-stage cyclone separator 9 in turn to recover fine powder. The tail gas discharged from the second cyclone separator is then treated by the water spray device and discharged through a 30m high exhaust stack; the water vapor in the dry tail gas is condensed and enters the circulating water pool of the water spray device, and then pumped into the circulating water pool of the desulfurization and denitrification device for reuse.

[0072] The invention has a novel structure, ingenious conception, and simple and convenient operation. Through the design, the purpose of making the wastewater dispersion process more uniform is effectively achieved, the collection of dried solid particles is convenient, the atomization effect of the waste liquid during atomization is increased, and it can adapt to different atomization liquid inflows. The function of adjusting the atomization effect during the atomization process is added, which is convenient for staff to operate.

[0073] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An aluminum fluoride tail gas desulfurization and denitrification system, characterized in that: include: A feed module (1), used for conveying wastewater to be dried; A drying tower is used for atomizing and drying wastewater so as to dry the solid solution in the wastewater into powder, comprising a tower body (2), a hot air distributor (3), an atomizer (4), an observation manhole (5), an internal lighting module, and a pneumatic hammer, wherein the hot air distributor (3) is connected to the top of the tower body (2), the atomizer (4) is located on the upper side of the interior of the tower body (2), the upper side of the atomizer (4) is connected to the feeding module (1), and the lower side of the atomizer (4) is provided with a disintegrating frame (6) which can rotate together with the atomizer (4); An air heating module (7) is connected to the hot air distributor (3) and is used to transport dry hot air to the interior of the drying tower; A primary cyclone separator (8) and a secondary cyclone separator (9), wherein the primary cyclone separator (8) is connected to the bottom of the drying tower, and the feed end of the secondary cyclone separator (9) is connected to the air outlet end of the primary cyclone separator (8); The waste gas treatment module (10) comprises a water spraying device and a spraying pool.

2. The aluminum fluoride tail gas desulfurization and denitrification system according to claim 1, characterized in that: The tower body (2) comprises, from top to bottom, a top plate (11), a circular cylinder (12) and a conical cylinder (13); the atomizer (4) is provided with a cleaning port (14) on the lower side of the top plate (11) and the lower side of the conical cylinder (13); the pneumatic percussion hammer is installed at the connection between the circular cylinder (12) and the conical cylinder (13); the observation manhole (5) and the lighting module in the tower are both arranged on the circular cylinder (12).

3. The aluminum fluoride tail gas desulfurization and denitrification system according to claim 2, characterized in that: The atomizer (4) comprises a rotatable atomizing disk (15) and an adjusting frame (16) which can move up and down along the atomizing disk (15); a plurality of first drainage strips (17) are fixedly connected to the lower side of the atomizing disk (15); a plurality of second drainage strips (18) are fixedly connected to the lower side of the adjusting frame (16); the first drainage strips (17) and the second drainage strips (18) cooperate with each other to form a structure for dispersing wastewater droplets.

4. The aluminum fluoride tail gas desulfurization and denitrification system according to claim 3, characterized in that: The outer side of the atomizing disk (15) is rotatably connected to a rotating frame (19), and the adjusting frame (16) is threadedly sleeved on the outer side of the rotating frame (19). The rotating frame (19) rotates to form a structure in which the adjusting frame (16) can be lifted and lowered.

5. The aluminum fluoride tail gas desulfurization and denitrification system according to claim 3, characterized in that: The upper side of the atomizing disk (15) is connected to a feeding sleeve (20), the top of the feeding sleeve (20) is fixedly connected to a first bevel gear ring (21), the upper side of the first bevel gear ring (21) is meshed with a first bevel gear (22) rotatably connected to the top plate (11), a power motor (23) is provided on the front side of the first bevel gear (22), and the output end of the power motor (23) is fixedly connected to the first bevel gear (22).

6. The aluminum fluoride tail gas desulfurization and denitrification system according to claim 5, characterized in that: A sun gear (24) is fixedly connected to the upper side of the atomizing disk (15), an outer gear ring (25) is fixedly connected to the inner side of the rotating frame (19), a plurality of planetary gears (26) are meshed between the sun gear (24) and the outer gear ring (25), a planetary frame (27) is rotatably connected to the upper side of the sun gear (24), and the upper side of each planetary gear (26) is rotatably connected to the planetary frame (27).

7. The aluminum fluoride tail gas desulfurization and denitrification system according to claim 6, characterized in that: A third bevel gear ring (28) is fixedly connected to the upper side of the planet carrier (27), and a second bevel gear (29) and a third bevel gear (30) are meshed on the upper side of the third bevel gear ring (28). An adjusting motor (31) fixedly connected to the blanking sleeve (20) is provided on the rear side of the second bevel gear (29), and an output end of the adjusting motor (31) is fixedly connected to the second bevel gear (29). A counterweight block (32) is provided on the front side of the third bevel gear (30), and the front side of the counterweight block (32) is rotatably connected to the blanking sleeve (20).

8. The aluminum fluoride tail gas desulfurization and denitrification system according to claim 5, characterized in that: A large rotating disk (33) is fixedly connected to the upper side of the atomizing sleeve, a power ring (34) rotatably connected to the top plate (11) is fixedly connected to the upper side of the disintegrating frame (6), a connecting rod (35) movable up and down is provided between the power ring (34) and the large rotating disk (33), a rotating disk (36) is provided on the outer sliding sleeve of the connecting rod (35), two fixed plates (37) fixedly connected to the connecting rod (35) are provided on the lower side of the rotating disk (36), a tension spring (38) is provided on the upper side of each fixed plate (37), and the upper side of each tension spring (38) is fixedly connected to the fixed plate (37), the large rotating disk (33) and the rotating disk (36) and the power ring (34) cooperate with each other to form a structure in which the disintegrating frame (6) rotates together with the atomizing disk (15), a connecting block (39) is rotatably connected to the upper side of the connecting rod (35), and an electric telescopic rod (40) is provided on the upper side of the connecting block (39).

9. The aluminum fluoride tail gas desulfurization and denitrification system according to claim 1, characterized in that: The disintegration frame (6) comprises a plurality of first disintegration plates (41) whose bottoms are fixedly connected to each other, and a plurality of second disintegration plates (42) are arranged between every two adjacent first disintegration plates (41).

10. An aluminum fluoride tail gas denitration method, applied to an aluminum fluoride tail gas desulfurization and denitration system according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1: wastewater feeding, the high-concentration salt-containing wastewater in the circulating water pool of the desulfurization and denitrification device is pumped to the water inlet pool of the drying and reuse device through a screw pump for temporary storage, and then pumped into the high-level tank of the drying tower. The screw pump adopts variable frequency speed regulation to effectively control the feed amount; Step S2: atomizing the wastewater. Under the action of gravity, the wastewater in the high-level tank of the drying tower naturally flows from the high-level tank through the outlet pipe into the center of the tower body (2), which is the atomizer (4). The atomizer (4) drives the wastewater droplets to rotate at a high speed of 11600 r / min, accelerating the wastewater droplets so that the wastewater droplets obtain a very high tangential linear velocity. When the wastewater droplets leave the atomizer (4), they are immediately rubbed and torn by air and atomized into wastewater droplets. When the atomizer (4) is started, the breaking frame (6) can be rotated in the opposite direction of the atomizer (4) to break up the larger wastewater droplets for a second time; Step S3: solidification of wastewater droplets. The hot air discharged from the air heating module (7) is sent to the hot air distribution chamber located at the top of the tower body (2) through the hot air duct, and contacts with the wastewater droplets in a downstream manner, drying the solid solution in the wastewater into powder, which falls to the lower part of the tower body (2); Step S4: treatment of the dry tail gas in the tower body (2). The dry tail gas is discharged from the exhaust port located at the lower part of the tower body (2) after passing through the primary cyclone separator (8) and the secondary cyclone separator (9) in sequence to recover fine powder. The tail gas discharged from the second cyclone separator is then treated by a water spray device and discharged through a 30m high exhaust stack. The water vapor in the dry tail gas is condensed and enters the circulating water pool of the water spray device, and then pumped into the circulating water pool of the desulfurization and denitrification device for reuse.

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