Atomization drying device for leachate concentrated solution

Abstract

The utility model belongs to the technical field of wastewater treatment, and relates to a leachate concentrated solution atomization drying device, which comprises a drying tower, a first-stage closed-up opening, a straight-barrel-shaped lower tower body and a second-stage closed-up opening, which are arranged from top to bottom, and a flue gas outlet pipe is arranged at the lower part of the lower tower body; the rotary atomizer is arranged in the center of the top of the drying tower and is used for atomizing the leachate concentrated solution into atomized liquid drops; the rotational flow gas inlet channel is arranged on the outer side of the rotary atomizer and used for uniformly guiding the high-temperature flue gas into the drying tower and making contact with the atomized liquid drops; the pressure relief device is arranged on the top surface of the drying tower and is used for automatically relieving pressure to ensure safety; the first-stage closing opening and the second-stage closing opening are each of an inverted hollow circular truncated cone structure. The height of the lower tower body is larger than that of the upper tower body, and the diameter of the upper tower body is larger than that of the lower tower body. Through rotational flow air inlet and the unique drying tower structure design, the treatment efficiency and the equipment performance are remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology and relates to a leachate concentrate atomization and drying device. Background Technology

[0002] Leachate concentrate (hereinafter referred to as "leachate concentrate") is the residual substance produced after landfill leachate undergoes biochemical treatment and membrane separation processes. Its composition is complex and its treatment is extremely difficult. This concentrate not only contains a large amount of recalcitrant organic matter, high concentrations of inorganic salts, heavy metal ions, and colloidal substances, but also exhibits high viscosity and low biodegradability. Traditional treatment methods such as evaporation crystallization and coagulation sedimentation face problems such as low mass transfer efficiency, severe equipment scaling, and difficulty in controlling secondary pollutants, making it difficult to achieve efficient volume reduction and stabilization.

[0003] In recent years, spray drying technology has demonstrated groundbreaking application potential in the treatment of leachate concentrate from municipal solid waste, thanks to its highly efficient heat and mass transfer characteristics. This technology breaks the concentrate into micron-sized droplets (10-200 μm) using an atomizing device and sprays them into high-temperature flue gas (400-600℃) for instantaneous drying, ultimately producing solid powder with a moisture content of <5%. Most of the solid powder is effectively collected inside the drying device, while a small amount is discharged with the flue gas and further captured by subsequent dust removal equipment.

[0004] The core equipment of existing spray drying processes includes atomizing devices and drying devices. The atomizing device primarily uses a rotary atomizer, achieving high-flow-rate atomization through high-speed centrifugation. The leachate concentrate is dispersed into tiny droplets, which diffuse outwards from the center, forming an umbrella-shaped atomized cloud. The drying device, based on the gas-solid two-phase flow field characteristics, is mainly classified into three structural types: co-current, counter-current, and mixed-flow, to meet the mixing requirements of the leachate concentrate and high-temperature flue gas. Co-current flow refers to the high-temperature flue gas and leachate concentrate entering the drying device from the same side and in the same direction; counter-current flow refers to the high-temperature flue gas and leachate concentrate entering the drying device from different sides and in opposite directions; mixed-flow flow refers to the high-temperature flue gas and leachate concentrate entering the drying device in both co-current and counter-current states.

[0005] However, significant problems still exist in practical applications. First, although rotary atomizers can achieve high-flow atomization through high-speed centrifugation, the umbrella-shaped atomized cloud they produce has a large coverage angle. The synergy between traditional drying devices and atomizers is insufficient, resulting in problems such as short droplet residence time and uneven gas-solid mixing, which affect drying efficiency and product recovery rate. Second, inorganic salts in the concentrate are prone to forming dense salt shells due to local supersaturation during the drying process, leading to scaling on the inner wall of the equipment. Third, the dried inorganic salt powder cannot be easily separated from the exhaust gas, exacerbating the risks of salt absorbing moisture and caking, and back-mixing of undried particles.

[0006] Therefore, a novel spray drying device is developed to optimize the flow field distribution and temperature control strategy in terms of structure and parameter control, so as to inhibit inorganic salt caking while efficiently drying the concentrate, thereby improving the system's operational stability and sustainability. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide a leachate concentrate atomization drying device, which uses a rotary atomizer to atomize the leachate concentrate into fine leachate concentrate atomized droplets, which are evenly distributed from the center of the co-flow drying tower to the surrounding area. At the same time, high-temperature flue gas is also dispersed from the center through a swirl inlet, which better contacts and mixes with the leachate concentrate atomized droplets. The two undergo rapid mass and heat transfer reactions, realizing the evaporation of water from the leachate concentrate and the drying of salts in the leachate concentrate into dry powder. The flue gas carries a large amount of water from the leachate concentrate and is discharged from the flue gas outlet pipe of the drying tower, separating it from the salt dry powder in the dried leachate concentrate, thereby achieving the purpose of drying and reducing the volume of leachate concentrate.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A leachate concentrate atomizing and drying device, comprising:

[0010] The drying tower includes a cylindrical upper tower body, a primary constriction, a cylindrical lower tower body, and a secondary constriction arranged from top to bottom, and a flue gas outlet pipe is provided at the lower part of the lower tower body.

[0011] A rotary atomizer, located at the center of the top of the drying tower, is used to atomize the leachate concentrate into atomized droplets.

[0012] The swirl inlet is located on the outside of the rotary atomizer and is used to uniformly guide the high-temperature flue gas into the drying tower and bring it into contact with the atomized droplets.

[0013] A pressure relief device is installed on the top surface of the drying tower to automatically relieve pressure and ensure safety.

[0014] Both the primary and secondary constrictions are inverted hollow frustum structures.

[0015] The height of the lower tower body is greater than the height of the upper tower body, and the diameter of the upper tower body is greater than the diameter of the lower tower body.

[0016] Furthermore, the closing angle of the primary closing section is a cone angle of 60° to 70° to avoid material bridging;

[0017] The diameter of the upper tower body is not less than the diameter of the atomized droplets after atomization by the rotary atomizer;

[0018] Furthermore, the flue gas outlet pipe has an L-shaped structure for discharging the dried flue gas.

[0019] Furthermore, the rotary atomizer includes a motor and an atomizing disc. The motor drives the atomizing disc to rotate at high speed, and the leachate concentrate is atomized into atomized droplets by centrifugal force.

[0020] Furthermore, the swirl inlet includes an inlet, an air distribution duct, and an air distribution duct;

[0021] The air intake duct adopts a volute structure with a gradually decreasing cross-section;

[0022] The uniform air distribution duct is a circular ring with a uniform cross-section, arranged inside the air intake duct, so that the flue gas flow from the air intake duct flows out of the uniform air distribution duct at a uniform speed.

[0023] The air distribution channel is a hollow, annular, frustum-shaped gap that connects to the side of the air distribution channel away from the air intake channel, and the rotating atomizer is installed in the central cavity of the air distribution channel.

[0024] Furthermore, the frustum-shaped gap is radially divided into an inner jacket and an outer jacket, which are staggered to accommodate atomized droplets in different areas.

[0025] Furthermore, the inner jacket extends longer into the drying tower than the outer jacket, creating a misalignment. This allows the flue gas velocity through the inner jacket to be faster, ensuring full contact with the atomized droplets at the center of the rotating atomizer. The flue gas velocity through the outer jacket is slower, which is beneficial for contact with the atomized droplets on the periphery.

[0026] Furthermore, it also includes a dust removal device, which includes a handhole and a vibration device for removing accumulated salt in the drying tower;

[0027] The handhole is located on the top surface of the drying tower near the upper tower wall, which facilitates the removal of salt adhering to the wall.

[0028] The vibration device is installed on the upper outer wall of the upper tower body and the lower outer wall of the lower tower body, and vibrates periodically to remove dry powder salt from the wall surface.

[0029] Furthermore, it also includes:

[0030] Monitoring instruments used to monitor and control the drying process;

[0031] The monitoring instrument includes a thermometer installed at the inlet of the swirl inlet duct;

[0032] Thermometers are installed at the top of the upper tower body and the top of the lower tower body;

[0033] A thermometer installed on the flue gas outlet pipe;

[0034] A pressure gauge installed at the pressure relief device;

[0035] A level gauge is installed in the middle of the secondary closing section.

[0036] The beneficial effects of this utility model are as follows:

[0037] This invention proposes a leachate concentrate atomization drying device, which significantly improves processing efficiency and equipment performance through swirl air intake and a unique drying tower structure design.

[0038] 1. Uniform drying and optimized gas-solid flow

[0039] This technical solution employs a swirling air inlet, a uniform air distribution duct, and a two-layer staggered jacket design to ensure uniform distribution and stratified entry of high-temperature flue gas into the drying tower. Compared to the traditional direct air inlet method, the swirling air inlet, through a volute-type air inlet and a uniform cross-section annular uniform air distribution duct, ensures stable flue gas velocity and full contact with the uneven atomized cloud generated by the rotating atomizer, achieving uniform drying of the leachate concentrate. The drying tower adopts a "straight section + primary constriction + straight section + secondary constriction" structure. The large-diameter straight section reduces the flue gas velocity and extends the mass and heat transfer time; the primary constriction accelerates the airflow to achieve initial particle separation; the small straight section buffers and reduces backmixing; and the secondary constriction enhances the separation of fine particles. This design optimizes the gas-solid two-phase flow, improves particle classification, and reduces the burden on subsequent screening.

[0040] 2. Reduce material accumulation and improve stability

[0041] The straight section structure of the drying tower facilitates the installation of vibrators or air hammers, effectively preventing the accumulation or clumping of highly viscous leachate concentrate at the bottom of the tower. The secondary constriction forms a centralized discharge port, which, in conjunction with a star valve or rotary valve, ensures continuous and stable discharge, avoiding the risk of blockage. Furthermore, the inclusion of ash-cleaning devices (such as manholes and vibrators) further reduces material buildup inside the tower, ensuring long-term stable operation and extending the equipment's service life.

[0042] 3. Reduce wear and energy consumption

[0043] By controlling the airflow velocity in stages, this solution significantly reduces equipment wear and energy consumption. The first-stage narrowing prevents high-speed airflow from directly impacting the tower bottom, while the short straight section further slows the flow velocity, protecting the tower body. The second-stage narrowing only accelerates the airflow near the discharge port, reducing the overall system pressure drop and thus reducing fan energy consumption. This design not only extends equipment life but also optimizes energy utilization, demonstrating its energy-saving and environmental protection advantages.

[0044] 4. Adapting to diverse needs and improving thermal efficiency

[0045] This technical solution adapts to the process requirements of various heat-sensitive materials. The drying time can be flexibly controlled by adjusting the length of the straight section, avoiding overheating or underheating. Furthermore, the straight section can be equipped with observation windows, cleaning ports, or pressure relief interfaces to improve equipment maintainability. In terms of thermal efficiency, the straight section creates a gentler temperature gradient, reducing overheating at the bottom of the tower and hot air short-circuiting, thus improving thermal energy utilization and ensuring a highly efficient and sustainable processing procedure.

[0046] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0047] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0048] Figure 1 This is a schematic diagram of the structure of a leachate concentrate atomizing and drying device in the embodiment;

[0049] Figure 2 This is a plan view of a leachate concentrate atomization drying device in the embodiment.

[0050] Figure 3 This is a schematic cross-sectional view of the swirl inlet in the embodiment;

[0051] Figure 4 This is a plan view of the swirl inlet in the embodiment.

[0052] Attached reference numerals: 1. Rotary atomizer; 2. Swirl air inlet; 3. Drying tower; 4. Pressure relief device; 5. Ash removal device; 6. Monitoring instrument.

[0053] Rotary atomizer: motor 1.1, atomizing disc 1.2;

[0054] Swirl-flow air intake: 2.1 air intake, 2.2 air distribution duct, 2.3 inner shell, 2.4 outer shell, 2.5 air distribution duct, 2.6 inner jacket, 2.7 outer jacket;

[0055] Drying tower: Upper tower body 3.1, primary end cap 3.2, lower tower body 3.3, secondary end cap 3.4, flue gas outlet pipe 3.5;

[0056] Dust collection cleaning device: handhole 5.1, vibration device 5.2;

[0057] Monitoring instruments: thermometer 6.1, pressure gauge 6.2, level gauge 6.3. Detailed Implementation

[0058] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0059] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0060] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0061] Example 1: Leachate Concentrate Atomizing and Drying Device

[0062] This embodiment provides a leachate concentrate atomization and drying device, such as... Figure 1 and Figure 2 As shown, the device includes a drying tower 3, a rotary atomizer 1, a swirl air inlet 2, a pressure relief device 4, a dust removal device 5, and a monitoring instrument 6.

[0063] Device structure description:

[0064] 1. Drying Tower 3:

[0065] Drying tower 3 is the main space for atomizing and drying the leachate concentrate, and from top to bottom includes:

[0066] Upper tower body 3.1: Cylindrical in shape, with a diameter of 3.6 meters and a height of 5.3 meters. The diameter is designed to be no less than the diffusion diameter of the atomized droplets after atomization by the rotary atomizer 1 (approximately 3 meters) to prevent droplets from adhering to the tower wall. Upper tower body 3.1 provides sufficient space for the preheating and constant-rate drying of the atomized droplets.

[0067] Stage 3.2: This stage is an inverted hollow frustum structure with a 65° cone angle and a height of 1.7 meters. The closure angle is controlled between 60° and 70° to prevent material bridging and to accelerate airflow, causing larger particles to settle.

[0068] Lower tower body 3.3: It is cylindrical with a diameter of 2 meters and a height of 8.2 meters. The height of the lower tower body 3.3 is greater than that of the upper tower body 3.1 to ensure that the material has sufficient time to dry, while stabilizing the airflow.

[0069] Secondary converging section 3.4: This is an inverted hollow frustum structure with a conical angle of 60° and a height of 1.5 meters, which further accelerates the airflow and improves the separation efficiency of fine particles.

[0070] Flue gas outlet pipe 3.5: It has an L-shaped structure. One end is connected to the lower part of the lower tower body 3.3 and is vertically inserted into the drying tower. The other end extends horizontally out of the drying tower 3 to discharge the dried flue gas.

[0071] 2. Rotary atomizer 1

[0072] A rotary atomizer 1 is arranged at the center of the top of the drying tower 3 to atomize the leachate concentrate into micron-sized droplets, including:

[0073] Motor 1.1: The motor is a variable frequency motor with a power of 5 kilowatts and an adjustable speed, up to 20,000 rpm.

[0074] Atomizing disc 1.2: Made of corrosion-resistant alloy, with a diameter of 0.3 meters, and equipped with an anti-clogging structure, it can atomize leachate concentrate into droplets with a diameter of approximately 50 micrometers. Rotary atomizer 1 is fixed to the inner shell 2.3 of the swirl air inlet 2 by a bracket.

[0075] 3. Swirl-flow air intake 2

[0076] The swirl inlet 2 is located outside the rotary atomizer 1, and is used to uniformly guide the high-temperature flue gas into the drying tower 3 so that it can fully contact the atomized droplets. Figure 3 and Figure 4 As shown, it includes:

[0077] Intake 2.1: It has a volute structure with an inlet cross-section of 0.45m × 0.45m, which gradually decreases to 0.35m × 0.35m along the circumference. The inner side of the intake 2.1 is not closed, and the opening size matches the gradually decreasing size of the intake duct. When the flue gas enters from the inlet, due to the gradually decreasing cross-sectional size, an equal amount of flue gas enters the air distribution duct through the inner opening of the intake duct at each cross-section, so that the flue gas is evenly distributed.

[0078] Uniform airflow duct 2.2: It is a circular ring with a uniform cross-section, an inner diameter of 1 meter, an outer diameter of 1.4 meters, and a height of 0.06 meters to ensure uniform flue gas flow rate; the flue gas enters from the inside of the air inlet duct 2.1, is integrated in the uniform airflow duct 2.2 to form flue gas with consistent air volume and uniform flow rate, and then enters the air distribution duct 2.5 formed by the inner shell 2.3 and the outer shell 2.4 from the other side.

[0079] The air distribution duct 2.5 is a hollow annular frustum-shaped gap between the inner shell 2.3 and the outer shell 2.4, radially divided into an inner jacket 2.6 and an outer jacket 2.7. The inner shell 2.3 has an inverted frustum wall, with an upper diameter of 1 meter, a lower diameter of 0.65 meters, and a height of 0.35 meters. The outer shell 2.4 has a volute shape and annular column at the top, serving as the walls of the air inlet duct 2.1 and the air distribution duct 2.2 respectively; the lower part is an inverted frustum wall, with an upper diameter of 1.5 meters, a lower diameter of 1 meter, and a height of 0.5 meters. The inner jacket 2.6 extends 0.2 meters into the drying tower 3, while the outer jacket 2.7 extends 0.1 meters, creating a misalignment. The flue gas velocity in the inner jacket 2.6 is faster, ensuring full contact with the central droplets; the flow velocity in the outer jacket 2.7 is slower, suitable for the peripheral droplets.

[0080] Specifically, the outer shell 2.4 is fixedly installed on the top of the drying tower 1, and the inner shell 2.3 and the outer shell 2.4 are fixedly connected by stiffening plates;

[0081] The inner shell 2.3 serves as a fixed support for the rotary atomizer 1. It is generally shaped like an inverted frustum with a hollow interior. The rotary atomizer 1 is fixed in the center of the hollow interior, and the atomizing disc 1.2 of the rotary atomizer 1 extends out from the small opening of the frustum of the inner shell 2.3.

[0082] 4. Dust removal device 5

[0083] Handhole 5.1: Located on the top surface of drying tower 3 near the wall of the upper tower body 3.1, there are 4 handholes with a diameter of 0.3 meters, which are convenient for cleaning the salt adhering to the wall.

[0084] Vibration device 5.2: It is a pneumatic vibrator, installed on the upper outer wall of the upper tower body 3.1 and the lower outer wall of the lower tower body 3.3, with 2 at each location, for timed removal of dry powder salt.

[0085] 5. Pressure relief device 4 is a safety valve, located on the top surface of drying tower 3, with a rated pressure of 3 kPa, to ensure safe operation of the equipment.

[0086] 6. Monitoring Instruments

[0087] Thermometers 6.1 are installed at the inlet of the swirl inlet duct 2, the upper part of the upper tower body 3.1, the upper part of the lower tower body 3.3, and the flue gas outlet pipe 3.5 to monitor the temperature.

[0088] Pressure gauge 6.2: Installed at pressure relief device 4 to monitor the pressure inside the tower.

[0089] Material level gauge 6.3: Located in the middle of the secondary closing section 3.4, it monitors the bottom material level.

[0090] Furthermore, observation windows, cleaning ports, or pressure relief interfaces can be installed on the side walls of the upper tower body 3.1 and the lower tower body 3.3 to improve the maintainability of the equipment.

[0091] Example 2: Control method for atomization drying of leachate concentrate

[0092] This embodiment provides a method for controlling the atomization and drying of leachate concentrate, applied to the apparatus described in Embodiment 1. The operation steps are as follows:

[0093] 1. Atomized leachate concentrate

[0094] Turn on the motor 1.1 of the rotary atomizer 1 and adjust the speed to 18,000 rpm.

[0095] The leachate concentrate is fed into the rotary atomizer 1 at a flow rate of 6 liters per minute. The centrifugal force generated by the high-speed rotation of the atomizing disc 1.2 atomizes it into atomized droplets with a diameter of about 50 micrometers.

[0096] 2. Introduce high-temperature flue gas

[0097] The temperature is 350-450℃ and the flow rate is 3500 Nm. 3 High-temperature flue gas per hour is introduced into drying tower 3 through swirl inlet duct 2.

[0098] The flue gas enters the volute-type air inlet 2.1, flows in a circular path, and enters the uniform air distribution duct 2.2 and the air distribution duct 2.5 through the inner opening. Then it enters the drying tower 3 through the inner jacket 2.6 (flow velocity of about 15 m / s) and the outer jacket 2.7 (flow velocity of about 10 m / s), where it comes into full contact with the atomized droplets.

[0099] 3. Drying process

[0100] Inside the upper tower body 3.1, the atomized droplets mix with the flue gas, are rapidly preheated, and enter a constant-rate drying stage. The flue gas velocity is about 0.2 m / s, and the residence time is about 25 seconds.

[0101] Through the first-stage constriction 3.2, the airflow is accelerated to 0.6 m / s, and large particles settle into the lower tower body 3.3.

[0102] Inside the lower tower body 3.3, the airflow velocity is stabilized at 0.6 m / s, and the fine particles continue to dry, with a residence time of about 10 seconds.

[0103] Through the secondary converging stage 3.4, the airflow is accelerated to 10 m / s, enhancing particle separation. The dried flue gas (temperature approximately 110–160°C) is discharged through the flue gas outlet pipe 3.5, with the salt powder settling at the bottom.

[0104] 4. Monitoring and Control

[0105] The flue gas temperature should be monitored by thermometer 6.1 at the inlet of the swirl inlet 2, and should be above 350℃.

[0106] The temperature of the upper part of the upper tower 3.1 is approximately 350℃, and the temperature of the upper part of the lower tower 3.3 is approximately 200℃, with a temperature difference of 150℃, indicating normal atomization. If the temperature difference does not exceed 100℃, check whether the rotating atomizer 1 is clogged or malfunctioning.

[0107] Pressure gauge 6.2 monitors the pressure inside the tower. If it exceeds 3 kPa, pressure relief device 4 will automatically release the pressure.

[0108] The level gauge 6.3 monitors the bottom material level and discharges the material when the set value is reached.

[0109] 5. Clean up accumulated dust

[0110] The vibration device is activated every 2 hours and vibrates for 5 minutes to remove dry powder and salt from the wall surface.

[0111] Weekly cleaning of the salt adhering to the walls of the upper tower body 3.1 through the handhole 5.1.

[0112] This invention provides a highly efficient atomizing and drying device for leachate concentrate. The device optimizes flue gas distribution through a swirling air inlet and a staggered jacket, while the segmented design of the drying tower improves drying efficiency and particle separation. The control method ensures stable system operation through temperature difference monitoring. It is suitable for treating leachate concentrates with high salinity and high organic matter content, achieving volume reduction and harmless treatment.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A leachate concentrate atomization and drying device, characterized in that, include: The drying tower includes a cylindrical upper tower body, a primary constriction, a cylindrical lower tower body, and a secondary constriction arranged from top to bottom, and a flue gas outlet pipe is provided at the lower part of the lower tower body. A rotary atomizer, located at the center of the top of the drying tower, is used to atomize the leachate concentrate into atomized droplets. The swirl inlet is located on the outside of the rotary atomizer and is used to uniformly guide the high-temperature flue gas into the drying tower and bring it into contact with the atomized droplets. A pressure relief device is installed on the top surface of the drying tower to automatically relieve pressure and ensure safety; Both the primary and secondary constrictions are inverted hollow frustum structures. The height of the lower tower body is greater than the height of the upper tower body, and the diameter of the upper tower body is greater than the diameter of the lower tower body.

2. The leachate concentrate atomizing and drying apparatus according to claim 1, characterized in that, The first-stage taper has a taper angle of 60° to 70° to avoid material bridging. The diameter of the upper tower body is not less than the diameter of the atomized droplets after atomization by the rotary atomizer.

3. The leachate concentrate atomizing and drying apparatus according to claim 1, characterized in that, The flue gas outlet pipe has an L-shaped structure and is used to discharge the dried flue gas.

4. The leachate concentrate atomizing and drying apparatus according to claim 1, characterized in that, The rotary atomizer includes a motor and an atomizing disc. The motor drives the atomizing disc to rotate at high speed, and the leachate concentrate is atomized into atomized droplets by centrifugal force.

5. The leachate concentrate atomizing and drying apparatus according to claim 1, characterized in that, The swirl inlet includes an inlet, an air distribution duct, and an air distribution duct. The air intake duct adopts a volute structure with a gradually decreasing cross-section; The uniform air distribution duct is a circular ring with a uniform cross-section, arranged inside the air intake duct, so that the flue gas flow from the air intake duct flows out of the uniform air distribution duct at a uniform speed. The air distribution channel is a hollow, annular, frustum-shaped gap that connects to the side of the air distribution channel away from the air intake channel, and the rotating atomizer is installed in the central cavity of the air distribution channel.

6. The leachate concentrate atomizing and drying apparatus according to claim 5, characterized in that, The frustum-shaped gap is radially divided into an inner jacket and an outer jacket, which are staggered to accommodate atomized droplets in different areas.

7. The leachate concentrate atomizing and drying apparatus according to claim 6, characterized in that, The inner jacket extends longer into the drying tower than the outer jacket, creating a misalignment. This allows the flue gas velocity through the inner jacket to be faster, ensuring full contact with the atomized droplets at the center of the rotating atomizer. The flue gas velocity through the outer jacket is slower, which is beneficial for contact with the atomized droplets on the outer periphery.

8. The leachate concentrate atomizing and drying apparatus according to claim 1, characterized in that, It also includes a dust removal device, which includes a handhole and a vibration device for removing accumulated salt in the drying tower; The handhole is located on the top surface of the drying tower near the upper tower wall, which facilitates the removal of salt adhering to the wall. The vibration device is installed on the upper outer wall of the upper tower body and the lower outer wall of the lower tower body, and vibrates periodically to remove dry powder salt from the wall surface.

9. The leachate concentrate atomizing and drying apparatus according to claim 1, characterized in that, Also includes: Monitoring instruments used to monitor and control the drying process; The monitoring instrument includes a thermometer installed at the inlet of the swirl inlet duct; Thermometers are installed at the top of the upper tower body and the top of the lower tower body; A thermometer installed on the flue gas outlet pipe; A pressure gauge installed at the pressure relief device; A level gauge is installed in the middle of the secondary closing section.

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