A rotary kiln ultra-low emission treatment device and treatment method

Abstract

This invention discloses a rotary kiln ultra-low emission treatment device and method, relating to the field of rotary kiln ultra-low emission treatment technology. It includes a desulfurization shell, on which a treatment mechanism for ultra-low emissions from the rotary kiln is installed. The treatment mechanism includes a flue gas inlet assembly, with a denitrification shell located at the upper end of the desulfurization shell, and a flue gas inlet pipe at the upper end of the denitrification shell. A first gear ring and a second gear ring drive corresponding spray pipes to rotate, ensuring that the catalyst and desulfurization slurry are evenly distributed in the denitrification and desulfurization zones, respectively. The stirring action of the flapper further enhances gas-liquid contact, ensuring sufficient reaction between nitrogen oxides, sulfides, and the reagents, improving the mixing efficiency between gaseous reactants, and increasing the pollutant removal rate. The stirring bracket rotates in the opposite direction under the drive of a second motor and a drive gear, efficiently stirring the desulfurization slurry, preventing slurry sedimentation and uneven concentration, and ensuring stable and reliable desulfurization performance.

Description

Technical Field

[0001] This invention relates to the field of ultra-low emission treatment technology for rotary kilns, specifically to an ultra-low emission treatment device and method for rotary kilns. Background Technology

[0002] Rotary kilns have wide and crucial applications in many industrial sectors, such as cement, metallurgy, and chemicals. However, during operation, rotary kilns generate large amounts of flue gas containing various pollutants. Nitrogen oxides (NOx) are one of the major pollutants, not only contributing to acid rain and causing severe damage to soil, water bodies, and vegetation, but also participating in the formation of photochemical smog, harming the human respiratory and cardiovascular systems. Sulfides, such as sulfur dioxide, are also significant pollutants; their emissions trigger acid rain, corrode buildings and industrial equipment, and have long-term negative impacts on the ecological environment. Furthermore, the flue gas contains a large number of particulate impurities. These particles not only reduce atmospheric visibility and affect air quality, but also, due to their fine particles, can penetrate deep into the lungs, causing various respiratory diseases and posing a serious threat to human health. With increasingly stringent environmental protection requirements, ultra-low emission treatment of rotary kiln flue gas has become a critical issue that urgently needs to be addressed.

[0003] Currently, the treatment of such flue gas generally adopts a series process route combining "selective catalytic reduction (SCR) denitrification" and "wet desulfurization". In terms of denitrification, some traditional devices are difficult to ensure sufficient contact between the catalyst and the flue gas, resulting in incomplete removal of nitrogen oxides and failure to meet ultra-low emission standards. In the desulfurization stage, the uneven distribution of desulfurization slurry is a prominent problem, with some areas having excessively high or low slurry concentrations, resulting in low sulfide absorption efficiency and affecting the overall desulfurization effect. Furthermore, the entire treatment system is usually composed of multiple independent units, occupying a large area, with complex connecting pipelines, posing risks of flue gas leakage and heat loss. Moreover, the independent drive of each unit's power equipment leads to high system energy consumption. In addition, when the flue gas pretreatment is insufficient, a large amount of dust enters the subsequent denitrification and desulfurization system. Therefore, this invention provides a rotary kiln ultra-low emission treatment device and method. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a rotary kiln ultra-low emission treatment device and method. It solves the problem that in denitrification, some traditional devices struggle to ensure sufficient contact between the catalyst and flue gas, leading to incomplete nitrogen oxide removal and failure to meet ultra-low emission standards. In the desulfurization stage, uneven distribution of the desulfurization slurry is a significant issue, with some areas having excessively high or low slurry concentrations, resulting in low sulfide absorption efficiency and affecting the overall desulfurization effect. Furthermore, the entire treatment system is typically composed of multiple independent units, resulting in a large footprint, complex piping, and risks of flue gas leakage and heat loss. Each unit's power equipment is independently driven, leading to high system energy consumption. Additionally, insufficient flue gas pretreatment allows large amounts of dust to enter the subsequent denitrification and desulfurization systems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a rotary kiln ultra-low emission treatment device, comprising a desulfurization shell, wherein the desulfurization shell is provided with a treatment mechanism for ultra-low emissions from the rotary kiln, the treatment mechanism comprising: The flue gas inlet assembly includes a desulfurization shell with a denitrification shell at the upper end, a flue gas inlet pipe at the upper end of the denitrification shell, a pair of fixing rings fixed inside the flue gas inlet pipe, filter screen supports connected by elastic components on both sides of the fixing rings, cams connected by drive components at the edges of the filter screen supports, and a discharge shell at the lower end of the flue gas inlet pipe, with a transmission belt inside the discharge shell. The processing assembly includes a desulfurization slurry zone at the bottom of the desulfurization shell, a pair of stirring supports inside the desulfurization slurry zone, a flue pipe on one side of the denitrification shell, the other end of the flue pipe being connected to the desulfurization shell, a first slide rail support fixed to the inner wall of the desulfurization shell, a first gear ring rotatably connected inside the first slide rail support, a first spray pipe evenly fixed to the inner wall of the first gear ring, a second slide rail support fixed to the inner wall of the denitrification shell, a second gear ring rotatably connected inside the second slide rail support, a second spray pipe evenly fixed to the inner wall of the second gear ring, a mounting shaft horizontally rotatably connected inside the denitrification shell, a flap fixed to the outer wall of the mounting shaft, and a third motor on one side of the desulfurization shell, the output end of the third motor being connected to a drive rod.

[0006] Preferably, the elastic component includes a spring uniformly fixed to the inner wall of a fixed ring, the filter screen bracket is fixedly connected to one end of the spring, and the inner ring of the spring is provided with a telescopic sleeve rod, the two ends of which are fixedly connected to the fixed ring and the filter screen bracket respectively.

[0007] Preferably, the drive assembly includes a first motor disposed at the upper end of the smoke inlet pipe, the output end of the first motor being connected to a first worm gear assembly, a transmission shaft being rotatably connected through the vertically penetrating smoke inlet pipe, the cam being fixedly connected to the outer wall of the transmission shaft, and one end of the transmission shaft being drively connected to the first worm gear assembly.

[0008] Preferably, the transmission belt is located directly below the filter support, the transmission belt is driven by a micro motor, and a receiving shell is provided at one end of the discharge shell.

[0009] Preferably, a first transmission gear is fixed to the outer wall of the drive rod, and the first transmission gear is meshed with the gear on the outer wall of the first gear ring. One end of the first spray pipe is connected to a first connecting shell, and the first spray pipe and the first connecting shell are in a flow connection. An extraction pipe is fixed through the outer shell of the desulfurization shell, and one end of the extraction pipe is in a flow connection with the first connecting shell and is rotatably connected to the first connecting shell. The other end of the extraction pipe is in a flow connection with the desulfurization slurry zone. A filler layer is provided below the first spray pipe on the inner wall of the desulfurization shell.

[0010] Preferably, a second motor is provided at the bottom of the desulfurization shell, the stirring bracket is connected to the output end of the second motor, a drive gear is fixed to the output end shell of the second motor, and a pair of drive gears are provided at the bottom of the desulfurization shell. The drive gears are meshed together, and the pair of stirring brackets are driven by the drive gears and the second motor.

[0011] Preferably, the mounting shaft extends to one end of the outer side of the denitrification shell and is provided with a second worm gear. The second worm gear is connected to the drive rod in a transmission manner. The top end of the drive rod is provided with a second transmission gear that meshes with the outer wall teeth of the second gear ring. One end of the second spray pipe is connected to a second connecting shell, and the outer shell of the denitrification shell is horizontally penetrated by a feed pipe. The feed pipe is rotatably connected to the second connecting shell. A conical shell is fixed inside the denitrification shell, and a drain pipe is provided at the lower end of the conical shell.

[0012] This invention also discloses a method for ultra-low emission treatment in rotary kilns, comprising the following steps: Step 1: Flue gas enters through the flue pipe. Large particles are intercepted by the filter screen support. The first motor drives the cam, which causes the filter screen to vibrate at high frequency to clean the dust through the spring. The shaken-off impurities are sent to the receiving shell by the transmission belt.

[0013] Step 2: The purified flue gas enters the denitrification shell. The third motor drives the second spray pipe to rotate and spray ammonia through the drive rod, and drives the flap to rotate to enhance mixing. Under the action of the catalyst, the SCR reaction occurs, and the product is drained through the conical shell.

[0014] Step 3: Finally, the denitrified flue gas enters the desulfurization shell through the exhaust pipe, and the desulfurization slurry is pumped into the rotating first spray pipe through the extraction pipe and evenly sprayed onto the packing layer for gas-liquid reaction. The second motor drives a pair of stirring brackets to synchronously stir the slurry zone in opposite directions.

[0015] Beneficial effects This invention provides a rotary kiln ultra-low emission treatment device and method. Compared with the prior art, it has the following advantages: Firstly, the first and second gear rings of this invention drive the corresponding spray pipes to rotate, so that the catalyst and desulfurization slurry are evenly distributed in the denitrification and desulfurization zones, respectively. The stirring effect of the flapper on the flue gas further enhances the gas-liquid contact, ensuring that nitrogen oxides, sulfides and reagents react fully, enhancing the mixing efficiency between gaseous reactants and improving the pollutant removal rate. The stirring bracket rotates in the opposite direction under the drive of the second motor and drive gear, efficiently stirring the desulfurization slurry, avoiding slurry sedimentation that leads to uneven concentration, and ensuring stable and reliable desulfurization effect.

[0016] Secondly, this invention integrates the denitrification shell and the desulfurization shell into a whole through the flue gas pipe. The denitrified flue gas is directly sent into the desulfurization system, reducing energy loss and leakage risk during flue gas transportation, realizing continuous denitrification and desulfurization treatment, and greatly improving the overall purification efficiency. Among them, a single third motor and drive rod, gear, and worm gear are used to synchronously control three key dynamic components, realizing the rotation of the flap and the spray pipe, reducing the number of independent motors and reducing manufacturing costs.

[0017] Thirdly, the first motor of this invention starts and transmits power through the first worm gear assembly, driving the transmission shaft to rotate, which in turn causes the cam fixed on the outer wall of the transmission shaft to rotate. During the rotation of the cam, it continuously squeezes the edge of the filter screen support. The filter screen support is connected to the fixed ring through the elastic component. Under the squeezing action of the cam and the restoring action of the spring, the filter screen support drives the filter screen to generate high-frequency vibration. The particulate impurities attached to the filter screen are shaken off by the vibration. The shaken impurities fall onto the transmission belt inside the discharge shell at the lower end of the flue gas inlet pipe. The transmission belt runs under the drive of the micro motor, transporting the impurities to the collection shell at one end of the discharge shell for collection. This effectively intercepts particulate impurities, preventing them from entering the denitrification and desulfurization systems and causing equipment blockage or catalyst failure. This provides clean flue gas conditions for subsequent treatment stages. At the same time, the cam, in conjunction with the elastic component, causes the filter screen to vibrate, achieving self-cleaning of the filter screen. This eliminates the need for frequent manual disassembly and cleaning. Then, the shaken impurities are accurately transported to the collection shell through the transmission belt for centralized collection and treatment, preventing impurities from scattering and causing secondary pollution, and improving the environmental friendliness of the device operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2This is a schematic diagram of the internal structure of the smoke inlet pipe of the present invention; Figure 3 This is a schematic diagram of the internal structure of the desulfurization shell and the denitrification shell of the present invention; Figure 4 This is a schematic diagram of the internal structure of the desulfurization shell of the present invention; Figure 5 This is a schematic diagram of the internal structure of the denitrification shell of the present invention.

[0019] In the diagram: 1. Desulfurization shell; 2. Denitrification shell; 3. Inlet pipe; 301. Fixing ring; 302. Spring; 303. Telescopic sleeve; 304. Filter screen support; 305. First motor; 306. First worm gear assembly; 307. Drive shaft; 308. Cam; 4. Discharge shell; 401. Drive belt; 402. Collection shell; 5. Desulfurization slurry zone; 501. Second motor; 502. Drive gear; 503. Stirring support; 504. Extraction pipe; 6. Exhaust pipe; 01. Filler layer; 602. First slide rail bracket; 603. First gear ring; 604. First spray pipe; 605. First connecting shell; 7. Third motor; 701. Drive rod; 702. First transmission gear; 8. Second slide rail bracket; 801. Second gear ring; 802. Second spray pipe; 803. Second connecting shell; 804. Feed pipe; 805. Second transmission gear; 9. Mounting shaft; 901. Flip plate; 902. Second worm gear assembly; 10. Conical shell. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-5 The present invention provides a technical solution A rotary kiln ultra-low emission treatment device includes a desulfurization shell 1, on which a treatment mechanism for ultra-low emissions from the rotary kiln is installed. The treatment mechanism includes: The flue gas inlet assembly includes a desulfurization shell 1 with a denitrification shell 2 at the upper end, a flue gas inlet pipe 3 at the upper end of the denitrification shell 2, an induced draft fan on the flue gas inlet pipe 3, a pair of fixing rings 301 fixed inside the flue gas inlet pipe 3, filter screen supports 304 connected by elastic components on both sides of the fixing rings 301, a cam 308 connected by a drive component at the edge of the filter screen supports 304, and a discharge shell 4 at the lower end of the flue gas inlet pipe 3, with a transmission belt 401 inside the discharge shell 4. The processing assembly includes a desulfurization slurry zone 5 at the bottom of the desulfurization shell 1, a pair of stirring supports 503 inside the desulfurization slurry zone 5, a flue pipe 6 on one side of the denitrification shell 2, the other end of the flue pipe 6 being connected to the desulfurization shell 1, a first slide rail support 602 fixed to the inner wall of the desulfurization shell 1, a first gear ring 603 rotatably connected inside the first slide rail support 602, a first spray pipe 604 evenly fixed to the inner wall of the first gear ring 603, a second slide rail support 8 fixed to the inner wall of the denitrification shell 2, a second gear ring 801 rotatably connected inside the second slide rail support 8, a second spray pipe 802 evenly fixed to the inner wall of the second gear ring 801, a mounting shaft 9 horizontally rotatably connected inside the denitrification shell 2, a flap 901 fixed to the outer wall of the mounting shaft 9, and a third motor 7 on one side of the desulfurization shell 1, with a drive rod 701 connected to the output end of the third motor 7.

[0022] The desulfurization shell 1, denitrification shell 2 and desulfurization slurry zone 5 are integrated into a whole through the exhaust pipe 6 and the extraction pipe 504. After treatment, the denitrification shell 2 is directly sent into the desulfurization shell 1 through the exhaust pipe 6, and an induced draft fan is installed on the exhaust pipe 6.

[0023] In a preferred embodiment, the elastic component includes a spring 302 uniformly fixed to the inner wall of a fixing ring 301, a filter support 304 fixedly connected to one end of the spring 302, a telescopic sleeve 303 provided on the inner ring of the spring 302, and the two ends of the telescopic sleeve 303 fixedly connected to the fixing ring 301 and the filter support 304 respectively. The driving component includes a first motor 305 provided on the upper end of the smoke inlet pipe 3, a first worm gear assembly 306 connected to the output end of the first motor 305, a transmission shaft 307 rotatably connected through the vertical passage of the smoke inlet pipe 3, a cam 308 fixedly connected to the outer wall of the transmission shaft 307, and one end of the transmission shaft 307 being connected to the first worm gear assembly 306. A transmission belt 401 is located directly below the filter support 304 and is driven by a micro motor. A receiving shell 402 is provided at one end of the discharge shell 4.

[0024] Specifically, firstly, the induced draft fan on the flue gas inlet pipe 3 starts, forming a negative pressure suction force to draw the flue gas discharged from the rotary kiln into the flue gas inlet pipe 3. After the flue gas enters, it first passes through the filter screen supported by the filter screen bracket 304 inside the flue gas inlet pipe 3. The particulate impurities in the flue gas are intercepted by the filter screen. Subsequently, the drive assembly starts to operate. The first motor 305 starts and transmits power through the first worm gear assembly 306, driving the transmission shaft 307 to rotate. This causes the cam 308 fixed on the outer wall of the transmission shaft 307 to rotate. During the rotation of the cam 308, it continuously squeezes the edge of the filter screen bracket 304. The filter screen bracket 304 is connected to the fixed ring 301 through the elastic component. Under the squeezing action of the cam 308 and the reset action of the spring 302, the filter screen bracket 304 drives the filter screen to generate high-frequency vibration, and the particulate impurities attached to the filter screen are shaken off by the vibration. Furthermore, the detached impurities fall onto the transmission belt 401 inside the discharge shell 4 at the lower end of the flue gas inlet pipe 3. The transmission belt 401 operates under the drive of a micro motor, transporting the impurities to the receiving shell 402 at one end of the discharge shell 4 for collection. The flue gas that has undergone preliminary impurity removal continues to enter the denitrification shell 2 to start the subsequent processing.

[0025] In a preferred embodiment, a first transmission gear 702 is fixed to the outer wall of the drive rod 701. The first transmission gear 702 is meshed with the gear on the outer wall of the first gear ring 603. One end of the first spray pipe 604 is connected to a first connecting shell 605. The first spray pipe 604 and the first connecting shell 605 are in a flow connection. An extraction pipe 504 is fixed through the outer shell of the desulfurization shell 1. One end of the extraction pipe 504 is in a flow connection with the first connecting shell 605 and is rotatably connected to the first connecting shell 605. The other end of the extraction pipe 504 is in a flow connection with the desulfurization slurry zone 5. A packing layer 601 is provided below the first spray pipe 604 on the inner wall of the desulfurization shell 1 to evenly disperse the desulfurization slurry on the packing layer 601. The denitrified flue gas is sent into the desulfurization zone through the exhaust pipe 6.

[0026] The flue gas, after being cleaned by the flue gas inlet assembly, enters the denitrification shell 2. The feed pipe 804 delivers the denitrification catalyst to the second connecting shell 803. The catalyst is diverted through the second connecting shell 803 to the second spray pipe 802 fixed on the inner wall of the second gear ring 801. Then, the third motor 7 starts and drives the drive rod 701 to rotate. The second transmission gear 805 at the top of the drive rod 701 meshes with the tooth block on the outer wall of the second gear ring 801, driving the second gear ring 801 to rotate in the second slide rail bracket 8, so that the second spray pipe 802 sprays the catalyst evenly. In addition, the drive rod 701 drives the mounting shaft 9 to rotate through the second worm gear group 902. The flap 901 on the outer wall of the mounting shaft 9 rotates synchronously, stirring the flue gas in the denitrification shell 2, so that the flue gas and the catalyst can fully contact each other and undergo selective catalytic reduction reaction, converting the nitrogen oxides in the flue gas into pollution-free nitrogen and water. The water produced by the reaction flows to the conical shell 10 under the action of gravity and is discharged through the drain pipe at the lower end of the conical shell 10.

[0027] In a preferred embodiment, a second motor 501 is provided at the bottom of the desulfurization shell 1, and the stirring bracket 503 is connected to the output end of the second motor 501. A drive gear 502 is fixed to the outer shell of the output end of the second motor 501, and a pair of drive gears 502 are provided at the bottom of the desulfurization shell 1. The drive gears 502 are meshed together, and the pair of stirring brackets 503 are driven by the drive gears 502 and the second motor 501.

[0028] In a preferred embodiment, a second worm gear assembly 902 is provided at one end of the mounting shaft 9 extending to the outer side of the denitrification housing 2. The second worm gear assembly 902 is connected to the drive rod 701 in a transmission manner. A second transmission gear 805 is provided at the top of the drive rod 701 and meshes with the outer wall teeth of the second gear ring 801. One end of the second spray pipe 802 is connected to the second connecting housing 803 in a flow manner. The housing of the denitrification housing 2 is horizontally penetrated by a feed pipe 804. The feed pipe 804 is rotatably connected to the second connecting housing 803. A conical housing 10 is fixed inside the denitrification housing 2. A drain pipe is provided at the lower end of the conical housing 10. The feed pipe 804 is used to spray in a catalyst, which undergoes a selective catalytic reduction reaction to generate pollution-free nitrogen and water, thus completing the denitrification treatment. The water is discharged through the conical housing 10.

[0029] Specifically, the denitrified flue gas is powered by an induced draft fan on the exhaust pipe 6 and sent into the desulfurization shell 1. Simultaneously, the desulfurization slurry in the desulfurization slurry zone 5 is transported to the first connecting shell 605 via the extraction pipe 504, and then diverted to the first spray pipe 604 on the inner wall of the first gear ring 603. The first transmission gear 702 on the drive rod 701 meshes with the gear on the outer wall of the first gear ring 603, causing the first gear ring 603 to rotate within the first slide rail bracket 602, thus allowing the first spray pipe 604 to evenly distribute the desulfurization slurry. The slurry is evenly sprayed onto the packing layer 601 below. When the flue gas passes through the packing layer 601, it comes into full contact with the desulfurization slurry adhering to the surface of the packing. The sulfides in the flue gas are absorbed by the slurry. During the desulfurization process, the second motor 501 starts and drives the drive gear 502 to rotate. The pair of drive gears 502 mesh and drive the two stirring brackets 503 to rotate in opposite directions, stirring the slurry in the desulfurization slurry zone 5 to ensure uniform slurry concentration. Finally, the purified flue gas is discharged from the desulfurization shell 1, completing the entire treatment process.

[0030] The aforementioned desulfurization slurry is pumped from the desulfurization slurry zone 5.

[0031] The first motor model mentioned above is YE3-80M2-4, the second motor model is Y2-132S-6, the third motor model is YE4-160M1-4, the micro motor driving the transmission belt 401 is a 60ZY24-10 type DC geared motor, the pump model is IHF80-50-200, and the induced draft fans involved are LN20C type rotary kiln special centrifugal induced draft fan and 4-72-11 type centrifugal induced draft fan. All of these are existing technologies and will not be elaborated on further.

[0032] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0033] This invention also discloses a method for ultra-low emission treatment in rotary kilns, comprising the following steps: Step 1: Flue gas enters through the flue gas inlet pipe 3. Large particles are intercepted by the filter support 304. The first motor 305 drives the cam 308, which causes the filter to vibrate at high frequency to clean the dust via the spring 302. The shaken-off impurities are sent to the receiving shell 402 by the transmission belt 401. Specifically, the induced draft fan on the flue gas inlet pipe 3 starts to create negative pressure, drawing the rotary kiln flue gas into the pipe. The flue gas first passes through the filter supported by the filter support 304 to intercept particulate impurities. Then, the first motor 305 drives the transmission shaft 307 and the cam 308 to rotate via the first worm gear assembly 306. The cam 308 squeezes the filter support 304. With the reset action of the spring 302 on the fixed ring 301 and the telescopic sleeve 303, the filter vibrates at high frequency. The detached impurities are transported to the receiving shell 402 by the transmission belt 401 below for collection.

[0034] Step 2: The purified flue gas enters the denitrification shell 2. The third motor 7 drives the second spray pipe 802 to rotate and spray ammonia through the drive rod 701, and drives the flap 901 to rotate to enhance mixing. Under the action of the catalyst, an SCR reaction occurs, and the product is drained through the conical shell 10. Specifically, the purified flue gas enters the denitrification shell 2, and the feed pipe 804 delivers the catalyst to the second connecting shell 803. The catalyst is sprayed out through the second spray pipe 802 on the inner wall of the second gear ring 801. At the same time, the third motor 7 drives the drive rod 701, which drives the second gear ring 801 to rotate in the second slide rail bracket 8 through the second transmission gear 805 to achieve uniform spraying. The drive rod 701 also drives the mounting shaft 9 and the flap 901 to rotate and stir the flue gas through the second worm gear group 902, so that nitrogen oxides react with the catalyst to generate nitrogen and water. The water is discharged through the drain pipe at the lower end of the conical shell 10.

[0035] Step 3: Finally, the denitrified flue gas enters the desulfurization shell 1 through the exhaust pipe 6. The desulfurization slurry is pumped into the rotating first spray pipe 604 through the extraction pipe 504 and evenly sprayed onto the packing layer 601 for gas-liquid reaction. The second motor 501 drives a pair of stirring brackets 503 to synchronously stir the slurry zone in opposite directions. Specifically, the denitrified flue gas is sent into the desulfurization shell 1 through the exhaust pipe 6. The slurry in the desulfurization slurry zone 5 enters the first connecting shell 605 through the extraction pipe 504 and is sprayed out through the first spray pipe 604 on the inner wall of the first gear ring 603. The first transmission gear 702 on the drive rod 701 drives the first gear ring 603 to rotate in the first slide rail bracket 602, so that the slurry is evenly sprayed onto the packing layer 601. When the flue gas passes through the packing layer 601, the sulfides are absorbed by the slurry. During this process, the second motor 501 drives the two stirring brackets 503 to rotate in opposite directions through a pair of meshing drive gears 502 to maintain the uniform concentration of the slurry. Finally, the purified flue gas is discharged from the desulfurization shell 1.

[0036] During operation, the induced draft fan on the flue gas inlet pipe 3 starts to create negative pressure, drawing the rotary kiln flue gas into the pipe. The flue gas first passes through the filter screen supported by the filter screen bracket 304 to intercept particulate impurities. Then, the first motor 305 drives the transmission shaft 307 and cam 308 to rotate through the first worm gear assembly 306. The cam 308 squeezes the filter screen bracket 304, and with the reset action of the spring 302 on the fixed ring 301 and the telescopic sleeve 303, the filter screen vibrates at high frequency. The detached impurities are transported by the transmission belt 401 below to the material collection shell 402 for collection. After impurity removal, the flue gas enters the denitrification shell 2. The feed pipe 804 delivers the catalyst to the second connecting shell 803, which is then sprayed out through the second spray pipe 802 on the inner wall of the second gear ring 801. Simultaneously, the third motor 7 drives the drive rod 701, which in turn drives the second gear ring 801 to rotate within the second slide rail bracket 8 via the second transmission gear 805, achieving uniform spraying. The drive rod 701 also drives the mounting shaft 9 and the flap 901 to rotate and stir the flue gas via the second worm gear assembly 902, promoting the reaction of nitrogen oxides and catalyst to generate nitrogen and water. The water is discharged through the drain pipe at the lower end of the conical shell 10. The denitrified flue gas is then sent into the exhaust pipe 6. The slurry from the desulfurization shell 1 and the desulfurization slurry zone 5 enters the first connecting shell 605 through the extraction pipe 504 and is sprayed out through the first spray pipe 604 on the inner wall of the first gear ring 603. The first transmission gear 702 on the drive rod 701 drives the first gear ring 603 to rotate in the first slide rail bracket 602, so that the slurry is evenly sprayed on the packing layer 601. When the flue gas passes through the packing layer 601, the sulfides are absorbed by the slurry. During this process, the second motor 501 drives the two stirring brackets 503 to rotate in opposite directions through a pair of meshing drive gears 502 to maintain the uniform concentration of the slurry. Finally, the purified flue gas is discharged from the desulfurization shell 1.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rotary kiln ultra-low emission treatment device, comprising a desulfurization shell (1), characterized in that: The desulfurization shell (1) is equipped with a treatment mechanism for ultra-low emissions from the rotary kiln, the treatment mechanism including: The flue gas inlet assembly includes a desulfurization shell (1) with a denitrification shell (2) at the upper end. The denitrification shell (2) has a flue gas inlet pipe (3) at the upper end. A pair of fixing rings (301) are fixed inside the flue gas inlet pipe (3). Filter screen supports (304) connected by elastic components are provided on both sides of the fixing rings (301). Cams (308) connected by drive components are provided at the edges of the filter screen supports (304). A discharge shell (4) is provided at the lower end of the flue gas inlet pipe (3). A transmission belt (401) is provided inside the discharge shell (4). The processing assembly includes a desulfurization slurry zone (5) at the bottom of a desulfurization shell (1), a pair of stirring supports (503) inside the desulfurization slurry zone (5), a flue pipe (6) on one side of the denitrification shell (2), the other end of the flue pipe (6) being connected to the desulfurization shell (1), a first slide rail support (602) fixed to the inner wall of the desulfurization shell (1), a first gear ring (603) rotatably connected inside the first slide rail support (602), and a first spray pipe (6) uniformly fixed to the inner wall of the first gear ring (603). 04), the inner wall of the denitrification shell (2) is fixed with a second slide rail bracket (8), the second slide rail bracket (8) is rotatably connected with a second gear ring (801), the inner wall of the second gear ring (801) is uniformly fixed with a second spray pipe (802), the inner wall of the denitrification shell (2) is horizontally rotatably connected with an installation shaft (9), the outer wall of the installation shaft (9) is fixed with a flap (901), a third motor (7) is provided on one side of the desulfurization shell (1), and the output end of the third motor (7) is connected with a drive rod (701).

2. The rotary kiln ultra-low emission treatment device according to claim 1, characterized in that: The elastic component includes a spring (302) uniformly fixed to the inner wall of a fixing ring (301), a filter support (304) fixedly connected to one end of the spring (302), and a telescopic sleeve (303) provided on the inner ring of the spring (302). The two ends of the telescopic sleeve (303) are fixedly connected to the fixing ring (301) and the filter support (304) respectively.

3. The rotary kiln ultra-low emission treatment device according to claim 1, characterized in that: The drive assembly includes a first motor (305) installed at the upper end of the smoke inlet pipe (3), the output end of the first motor (305) is connected to a first worm gear assembly (306), the vertical through-hole of the smoke inlet pipe (3) is rotatably connected to a drive shaft (307), the cam (308) is fixedly connected to the outer wall of the drive shaft (307), and one end of the drive shaft (307) is connected to the first worm gear assembly (306) for transmission.

4. The rotary kiln ultra-low emission treatment device according to claim 1, characterized in that: The transmission belt (401) is located directly below the filter support (304). The transmission belt (401) is driven by a micro motor, and a receiving shell (402) is provided at one end of the discharge shell (4).

5. The rotary kiln ultra-low emission treatment device according to claim 1, characterized in that: The outer wall of the drive rod (701) is fixed with a first transmission gear (702), which meshes with the gear on the outer wall of the first gear ring (603). One end of the first spray pipe (604) is connected to a first connecting shell (605), and the first spray pipe (604) and the first connecting shell (605) are in a flow connection. An extraction pipe (504) is fixed through the shell of the desulfurization shell (1), and one end of the extraction pipe (504) is in a flow connection with the first connecting shell (605) and is rotatably connected with the first connecting shell (605). The other end of the extraction pipe (504) is in a flow connection with the desulfurization slurry zone (5). A filler layer (601) is provided below the first spray pipe (604) on the inner wall of the desulfurization shell (1).

6. The rotary kiln ultra-low emission treatment device according to claim 1, characterized in that: The bottom of the desulfurization shell (1) is provided with a second motor (501), the stirring bracket (503) is connected to the output end of the second motor (501), the output end shell of the second motor (501) is fixed with a drive gear (502), and the bottom of the desulfurization shell (1) is provided with a pair of drive gears (502), the drive gears (502) are meshed together, and the pair of stirring brackets (503) are driven by the drive gears (502) and the second motor (501).

7. The rotary kiln ultra-low emission treatment device according to claim 1, characterized in that: The mounting shaft (9) extends to one end of the outer side of the denitrification shell (2) and is provided with a second worm gear (902). The second worm gear (902) is connected to the drive rod (701) in a transmission connection. The top end of the drive rod (701) is provided with a second transmission gear (805) that meshes with the outer wall teeth of the second gear ring (801). One end of the second spray pipe (802) is connected to a second connecting shell (803). The shell of the denitrification shell (2) is horizontally penetrated by a feed pipe (804). The feed pipe (804) is rotatably connected to the second connecting shell (803). A conical shell (10) is fixed inside the denitrification shell (2). A drain pipe is provided at the lower end of the conical shell (10).

8. A method for treating ultra-low emissions from a rotary kiln, employing the ultra-low emission treatment device for a rotary kiln as described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: The flue gas enters through the flue pipe (3). Large particles are intercepted by the filter support (304). The first motor (305) drives the cam (308), which causes the filter to vibrate at high frequency to clean the dust through the spring (302). The shaken-off impurities are sent to the receiving shell (402) by the transmission belt (401). Step 2: Purified flue gas enters the denitrification shell (2). The third motor (7) drives the second spray pipe (802) to rotate and spray ammonia through the drive rod (701), and drives the flap (901) to rotate to strengthen the mixing. Under the action of the catalyst, the SCR reaction occurs, and the product is drained through the conical shell (10). Step 3. Finally, the denitrified flue gas enters the desulfurization shell (1) through the exhaust pipe (6), and the desulfurization slurry is pumped into the rotating first spray pipe (604) through the extraction pipe (504) and evenly sprayed onto the packing layer (601) for gas-liquid reaction. The second motor (501) drives a pair of stirring brackets (503) to synchronously stir the slurry zone in opposite directions.

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