A production process for molecular sieve activated powder using a rotary kiln

Abstract

This invention discloses a production process for activated molecular sieve powder using a rotary kiln, involving equipment such as a rotary roasting kiln, a dryer, an exhaust cyclone separator, and a dehumidification cyclone separator. The process includes: molecular sieve raw powder is mixed with high-temperature flue gas generated by the dryer and the rotary roasting kiln to form powder-containing flue gas, which enters the exhaust cyclone separator for initial gas-solid separation. The separated material enters a feeding device, and the flue gas is discharged after secondary separation by an exhaust dust collector, while the material flows back to the exhaust cyclone separator. The material undergoes secondary drying in the rotary roasting kiln, forming material-containing moisture gas. This moisture gas is treated by gas-solid separation in the dehumidification cyclone separator and separation by the dehumidification dust collector, with the gas discharged and the material flowing back. The secondary-dried material enters the roasting zone for roasting to form activated powder, and after cooling in the cooling zone, it is conveyed by a water-cooled screw conveyor. This process reduces the moisture content of the material and the roasting time, uses natural gas as an energy source to reduce energy consumption, utilizes high-temperature flue gas as a heat source to improve efficiency, and the pneumatic conveying system improves the environment and reduces land occupation.

Description

Technical Field

[0001] This invention belongs to the field of calcination and drying processes and related equipment for molecular sieve activated powder, and relates to a production process for molecular sieve activated powder using a rotary kiln. Background Technology

[0002] Molecular sieve activated powder is obtained by high-temperature calcination of raw molecular sieve powder. Because the raw molecular sieve powder loses most of its moisture during the high-temperature calcination process, the activated powder possesses strong activity and can be directly applied in production as a selective adsorbent. It can be used to adsorb impurities such as H2O, CO2, and H2S generated during production processes, making it an excellent amorphous adsorbent.

[0003] However, the calcination of molecular sieve activated powder has strict temperature requirements. If the temperature is too high, it will destroy the spatial structure of the molecular sieve, causing it to burn out; if the temperature is too low, the structural water will not be able to drain out, affecting the adsorption effect. Therefore, calcination is the most important step in the production process of activated powder, and the calcination equipment currently used in the industry is roller kiln or tunnel kiln.

[0004] In existing roller kilns or tunnel kilns, molecular sieve powder is fed into a steel box mechanically or manually. The box is then propelled into the kiln by rollers or hydraulic pressure. As the box advances within the kiln, the molecular sieve powder undergoes preheating, drying, calcination, and cooling before exiting the kiln. After exiting the kiln, the activated powder is poured out of the box mechanically or manually. In this process, the activated molecular sieve powder is produced by removing free water and structural water from the molecular sieve powder in stages at a suitable temperature. In industrial production, pusher kilns are commonly used. Because molecular sieve powder is highly sensitive to temperature, electricity is currently the primary energy source. Production using pusher kilns is relatively small, typically between 200-500 tons per year.

[0005] Meanwhile, existing molecular sieve activated powder production equipment mainly uses horizontal and vertical conveying equipment, resulting in large workshop areas; it is mostly a semi-open environment with poor production conditions, and the collected dust products cannot be utilized; the power utilization efficiency is low, the unit price is high, and the unit energy consumption is high; the main equipment is too long, making machining difficult and the equipment investment high. Summary of the Invention

[0006] The purpose of this invention is to provide a production process for molecular sieve activated powder using a rotary kiln, and a molecular sieve activated powder equipment based on natural gas as fuel. This solves the problem of unstable temperature control in gas-fired kilns, reduces the energy consumption of molecular sieve activated powder production, and increases the yield of molecular sieve activated powder.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A production process for molecular sieve activated powder using a rotary kiln includes a rotary calcining kiln, a dryer, an exhaust cyclone separator, and a dehumidification cyclone separator. The steps are as follows:

[0009] 1) Drying pretreatment step: Molecular sieve raw powder is fed into the dryer through the feed port. The high-temperature flue gas generated by the combustion of the rotary kiln enters the dryer through the exhaust pipe and mixes with the molecular sieve raw powder in the dryer to form powder-containing flue gas. The powder-containing flue gas is discharged from the discharge port of the dryer and flows into the exhaust cyclone along the outlet duct.

[0010] 2) Initial gas-solid separation step: The flue gas cyclone separator separates the material from the flue gas containing powder. The separated material flows out from the outlet of the flue gas cyclone separator and enters the feeding device of the rotary kiln. The separated flue gas is discharged from the exhaust port of the flue gas cyclone separator and enters the flue gas dust collector. The flue gas dust collector performs secondary separation of the material in the flue gas. The gas after secondary separation is discharged through the flue gas fan. The material after secondary separation flows back to the flue gas cyclone separator through the pipeline.

[0011] 3) Secondary drying step: After the material in the feeding device enters the rotary kiln, it undergoes secondary drying. The secondary drying will generate humid air containing the material (the humid air contains approximately 30% of the material fed into the feeding device). The humid air is discharged from the exhaust port of the exhaust device and enters the exhaust cyclone separator. The exhaust cyclone separator performs a primary separation between the material and the humid gas. The separated material flows back to the feeding device through a pipeline, and the separated humid gas enters the exhaust dust collector through a pipeline. The exhaust dust collector performs a secondary separation between the material and the humid gas. The gas after secondary separation is discharged by the exhaust fan, and the material after secondary separation flows back to the exhaust cyclone separator through a pipeline.

[0012] 4) Calcination step: The material after secondary drying (approximately 70% of the material fed by the feeding device) enters the calcination zone of the rotary kiln, where the combustion system of the rotary kiln calcines the material to form molecular sieve activated powder.

[0013] 5) Cooling and conveying steps: The molecular sieve activated powder enters the cooling zone of the rotary kiln, is discharged from the discharge port of the rotary kiln, and enters the water-cooled screw conveyor for cooling and conveying.

[0014] As a further improvement of one embodiment of the present invention, the feed port of the dryer is provided with a feeding screw conveyor, and the screw discharge port of the feeding screw conveyor is located inside the dryer; the upper end of the dryer is an upper cone, the discharge port of the dryer is located on the upper cone, the lower end of the dryer is a lower cone, and a flue gas inlet connected to the exhaust pipe is provided on the lower cone; the dryer located below the screw discharge port is provided with a rotating cutter head, which can rotate at high speed under the drive of the drive mechanism and form an upward airflow.

[0015] As a further improvement of one embodiment of the present invention, the feeding screw conveyor has a small bag feed inlet and a ton bag feed inlet, wherein the small bag feed inlet is used for feeding small bags and the ton bag feed inlet is used for feeding ton bags.

[0016] As a further improvement of one embodiment of the present invention, the ton bag inlet is provided with a support frame and a ton bag exhaust port, the support frame is used for placing the ton bag, and the ton bag exhaust port is connected to the main channel for ton bag feeding.

[0017] As a further improvement of one embodiment of the present invention, the driving mechanism includes a mounting frame, a bearing seat is provided on the mounting frame, a transmission shaft connected to the rotating cutter head is provided inside the bearing seat, a drive motor is provided on the mounting frame, and the drive motor and the transmission shaft are driven by a belt; a packing seal is provided between the bearing seat and the lower cone, and a compressed gas channel is provided inside the bearing seat to form an air seal between the bearing seat and the lower cone.

[0018] As a further improvement of one embodiment of the present invention, the mounting bracket is provided with an oil pump for cooling and lubricating the bearing housing.

[0019] As a further improvement of one embodiment of the present invention, a reverse air cone is provided between the spiral discharge port and the upper cone body, the reverse air cone being used to block the rising airflow and form a reverse airflow.

[0020] As a further improvement of one embodiment of the present invention, the flue gas inlet is disposed on the inclined surface of the lower vertebra and is distributed at 90° with the inclined surface, and is directly opposite the central axis of the lower vertebra.

[0021] As a further improvement of one embodiment of the present invention, an air distribution plate is provided inside the dryer between the rotating cutter head and the spiral feed port. The air distribution plate is provided with a plurality of guide holes that are wider at the top and narrower at the bottom, which are used to accelerate the airflow from bottom to top inside the dryer.

[0022] As a further improvement of one embodiment of the present invention, the fuel of the combustion system is natural gas, and it includes multiple burners, each of which is equipped with a set of control devices to enable independent operation.

[0023] The above technical solution has the following beneficial effects:

[0024] 1. By using the dehumidification devices of the dryer and rotary kiln, the moisture content of the material entering the roasting zone of the rotary kiln is reduced, thereby reducing the roasting time of the material;

[0025] 2. Using natural gas as the production energy source significantly reduces unit energy consumption compared to electricity; at the same time, using the high-temperature flue gas generated by the rotary kiln combustion as the heat source for the dryer fully utilizes the heat of natural gas, improves efficiency, and reduces energy consumption.

[0026] 3. By applying equipment such as exhaust cyclones, dehumidification cyclones, exhaust dust collectors, dehumidification dust collectors, exhaust fans, and dehumidification fans, a pneumatic conveying system is formed, which reduces material exposure and improves the production environment; it also solves the problem of having too many horizontal and vertical conveying devices, and forms a closed loop through pipeline connections, reducing the floor space required.

[0027] 4. Increased the output of a single production line, reaching 3500t per line. Attached Figure Description

[0028] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0029] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0030] Figure 1 This is a schematic diagram of the process flow provided by the present invention.

[0031] Figure 2 This is a schematic diagram of the dryer and its surrounding structure provided by the present invention.

[0032] Figure 3 This is a schematic diagram of a ton bag feed inlet structure provided by the present invention.

[0033] In the picture:

[0034] 1. Rotary kiln; 11. Feeding device; 12. Dehumidification device; 13. Firing zone; 14. Cooling zone;

[0035] 2. Dryer;

[0036] 21. Main unit vertical cylinder;

[0037] 22. Upper vertebral body;

[0038] 23. Lower vertebral body; 231. Flue gas inlet; 232. Cleaning port;

[0039] 24. Rotate the cutter head;

[0040] 251. Mounting bracket; 252. Bearing housing; 253. Drive shaft; 254. Drive motor; 255. Oil pump; 256. Compressed gas passage;

[0041] 26. Air distribution panel;

[0042] 27. Backdraft cone;

[0043] 3. Smoke exhaust cyclone;

[0044] 4. Dehumidification cyclone separator;

[0045] 5. Smoke and dust collector;

[0046] 6. Dehumidifier and dust collector;

[0047] 7. Smoke exhaust fan;

[0048] 8. Dehumidifier fan;

[0049] 9. Feed screw conveyor; 91. Small bag feed inlet; 92. Ton bag feed inlet; 93. Ton bag exhaust port;

[0050] 10. Water-cooled screw conveyor;

[0051] 101. Outlet duct; 102, 103, 104, 105. Pipeline; 106. Smoke exhaust pipe. Detailed Implementation

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0053] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0054] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention. Example

[0055] See Figure 1As shown, a production process for molecular sieve activated powder using a rotary kiln includes a rotary calcining kiln 1, a dryer 2, an exhaust cyclone 3, and a dehumidification cyclone 4. The steps are as follows:

[0056] Step 1, Drying Pretreatment Step: Molecular sieve raw powder is fed into the feed port of dryer 2. The high-temperature flue gas generated by the combustion of rotary kiln 1 enters dryer 2 through exhaust pipe 106 and mixes with the molecular sieve raw powder in dryer 2 to form high-concentration powder-containing flue gas. The powder-containing flue gas is discharged from the discharge port of dryer 2 and flows into exhaust cyclone 3 along the outlet duct 101.

[0057] Step 2, Initial Gas-Solid Separation: The flue gas cyclone 3 separates the material from the flue gas containing powder, resulting in low-concentration powder-containing flue gas and some dried molecular sieve powder, achieving 80% material collection. The separated material (molecular sieve powder) flows out from the outlet of the flue gas cyclone 3 and enters the feeding device 11 of the rotary kiln 1 through a pipeline. The separated flue gas (low-concentration powder-containing flue gas) exits from the exhaust outlet of the flue gas cyclone 3 and enters the flue gas dust collector 5 through pipeline 102. The flue gas dust collector 5 performs secondary material separation on the flue gas. After this separation, 99.99% of the material is collected, yielding compliant gas and molecular sieve powder. The gas after secondary separation (compliant gas) is discharged to the chimney by the exhaust fan 7, while the material after secondary separation (molecular sieve powder) flows back into the flue gas cyclone 3 through pipeline 104.

[0058] Step 3, Secondary Drying: After the material in the feeding device 11 enters the rotary kiln 1, it undergoes secondary drying. This secondary drying generates moisture containing the material (approximately 30% of the material fed into the feeding device). This moisture is discharged from the exhaust port of the exhaust device 12 and enters the exhaust cyclone 4 through the exhaust pipe. The exhaust cyclone 4 performs a primary separation of the material and the humid gas, completing 80% material collection. The separated material flows back to the feeding device 11 through a pipeline, while the separated humid gas enters the exhaust dust collector 6 through pipeline 103. The exhaust dust collector 6 performs a secondary separation of the material in the humid gas, completing 99.99% material collection after this separation. The gas after secondary separation is discharged to the chimney by the exhaust fan 8, and the separated material flows back to the exhaust cyclone 3 through pipeline 105.

[0059] Step 4, Calcination Step: The material after secondary drying (approximately 70% of the material fed by the feeding device) enters the calcination zone 13 (heating zone) of the rotary calcining kiln 1, where the combustion system of the rotary calcining kiln 1 calcines the material to form molecular sieve activated powder; the combustion system uses natural gas as the production energy source, which significantly reduces the unit energy consumption compared to electricity.

[0060] Step 5, Cooling and Conveying Steps: The activated molecular sieve powder enters the cooling zone 14 of the rotary kiln 1, and is discharged from the outlet of the rotary kiln 1 into the water-cooled screw conveyor 10 for cooling and conveying, so that the activated molecular sieve powder can enter the next screening and packaging process.

[0061] In this embodiment, the combustion system employs a multi-burner configuration, with each burner capable of independent operation. This design enhances the flexibility and reliability of the combustion system. Each burner is equipped with a complete set of control devices, including a proportional control valve, a combustion controller, a temperature controller, a thermocouple, and several valves. The proportional control valve precisely controls the mixing ratio of fuel gas and air, while the combustion controller monitors the combustion process to ensure stable and efficient combustion. The temperature controller monitors the combustion temperature in real time via thermocouples and automatically adjusts the valve opening based on the set value to maintain a stable combustion temperature.

[0062] The high-temperature flue gas generated after combustion is discharged through the exhaust port of the rotary kiln 1. Under the suction of the exhaust fan 7, the flue gas enters the dryer 2 through the exhaust pipe 106. This design not only makes full use of the heat generated by combustion, but also improves energy efficiency, while ensuring that the material in the dryer 2 can be dried evenly and thoroughly.

[0063] This invention effectively reduces the moisture content of materials entering the roasting zone of the rotary roasting kiln 1 by using the dehumidification devices of the dryer 2 and the rotary roasting kiln 1. In the dryer 2, the molecular sieve powder is thoroughly mixed with the high-temperature flue gas generated by combustion in the rotary roasting kiln 1. The high-temperature flue gas transfers heat to the material, causing the moisture in the material to evaporate rapidly, forming a high-concentration powder-containing flue gas. This process not only removes most of the free moisture from the material but also makes the material easier to chemically react in subsequent processing. The dehumidification device of the rotary roasting kiln 1 further performs secondary drying on the material, discharging moisture through the exhaust port to ensure that the material reaches a low moisture content before entering the roasting zone. Lower moisture content significantly reduces the roasting time, as moisture evaporation requires a large amount of heat and time. With reduced moisture content, the roasting process can focus more on the activation reaction of the molecular sieve, thereby improving production efficiency.

[0064] This process utilizes natural gas as the production energy source, resulting in significantly lower unit energy consumption compared to electricity. As a clean and efficient energy source, the heat generated by the combustion of natural gas can be directly used in the roasting process of rotary kiln 1. Simultaneously, the high-temperature flue gas produced by the combustion in rotary kiln 1 is fully utilized as a heat source for dryer 2, achieving cascaded utilization of heat. This method of fully utilizing heat not only improves energy efficiency but also reduces overall energy consumption, making the production process more economical and environmentally friendly.

[0065] In terms of material conveying, a complete pneumatic conveying system is formed through the application of equipment such as exhaust cyclone 3, dehumidification cyclone 4, exhaust dust collector 5, dehumidification dust collector 6, exhaust fan 7, and dehumidification fan 8. This system connects the various devices through pipelines to form a closed loop, reducing material exposure and effectively improving the production environment. At the same time, the pneumatic conveying system solves the problem of numerous traditional horizontal and vertical conveying devices, reducing the floor space required and making the production line more compact and efficient.

[0066] Through the optimization and improvement of the above process, this technology has significantly increased the output of a single production line, reaching 3500 tons. This high-output production line can meet the large market demand for molecular sieve activated powder while reducing production costs.

[0067] This invention features an optimized design for the dryer 2 to better achieve the drying process of the molecular sieve powder. The specific structure is as follows: Figure 2 As shown, the dryer 2 includes a main vertical cylinder 21, an upper cone 22 located at the upper end of the main vertical cylinder, and a lower cone 23 located at the lower end of the main vertical cylinder. A feeding screw conveyor 9 is provided at the feeding port of the dryer 2. The screw discharge port of the feeding screw conveyor 9 is located inside the dryer 2 to ensure that the molecular sieve raw powder can continuously enter the dryer. The lower cone 23 is provided with a flue gas inlet 231 connected to the flue gas pipe 106, so that the high-temperature flue gas generated by the combustion of the rotary kiln 1 can smoothly enter the dryer 2.

[0068] A rotating cutter head 24 is installed inside the dryer 2 below the spiral feed inlet. Driven by a drive mechanism, this rotating cutter head 24 rotates at high speed, creating an upward airflow. This design not only helps the molecular sieve powder to disperse fully within the dryer 2, but also allows for more thorough contact between the high-temperature flue gas and the material, thereby improving drying efficiency. Simultaneously, the cutting and stirring action of the rotating cutter head 24 helps break up material clumps, further promoting the drying process.

[0069] Furthermore, the main unit's vertical cylinder 21 is equipped with fixing ears for securing the dryer 2. The drive mechanism includes a mounting bracket 251, on which a bearing housing 252 is mounted. A drive shaft 253, connected to the rotating cutter head 24, is installed within the bearing housing 252. The drive shaft 253 transmits power to the rotating cutter head 24, enabling it to rotate at high speed. Simultaneously, a packing seal is used between the bearing housing 252 and the lower cone 23, and a compressed gas channel 256 is provided within the bearing housing 252, forming an air seal between the bearing housing 252 and the lower cone 23, further enhancing the sealing effect and ensuring no powder leakage at the joint.

[0070] To drive the drive shaft 253, a drive motor 254 is mounted on the mounting bracket 251. The drive motor 254 and the drive shaft 253 are connected by a belt drive (such as a V-belt), which is characterized by its simple structure and smooth transmission.

[0071] In addition, to extend the service life of the bearing housing 252, an oil pump 255 is also installed on the mounting bracket 251. The oil pump 255 is responsible for supplying cooling and lubricating grease to the bearing housing 252, ensuring that the bearing housing 252 can maintain good working condition during high-speed operation and reducing wear and failure. This design not only improves the reliability of the drive mechanism but also reduces maintenance costs.

[0072] In this embodiment, the feeding screw conveyor 9 is designed with a continuous shaft that passes through the main machine cylinder 21, and a bearing seat is configured on the other side of the main machine cylinder. This structural design can jointly support the weight of the screw, ensuring the stability and reliability of the feeding screw conveyor 9 during operation. The feeding screw conveyor 9 is provided with a small bag inlet 91 and a ton bag inlet 92 to meet the feeding requirements of different packaging specifications.

[0073] Specifically, the small package inlet 91 is equipped with a dedicated cover and grille. This design prevents material from splashing out during feeding and accommodates small packages weighing up to 25kg, improving feeding flexibility and convenience. Figure 3 As shown, the ton bag inlet 92 is equipped with a support frame and a ton bag vent 93. The support frame is used to securely place the ton bag and ensure a stable feeding process. The ton bag vent 93 is connected to the main feeding channel of the ton bag and can effectively discharge the air in the ton bag during the feeding process, avoiding blockage caused by air compression, thereby ensuring the smooth feeding of the ton bag.

[0074] In this embodiment, the flue gas inlet 231 is located on the inclined surface of the lower cone 23, at a 90° angle to the inclined surface, and directly opposite the central axis of the lower cone 23. This design allows the flue gas to smoothly enter the lower cone 23 and, together with the rotating cutter head 24, form a unique air chamber at the lower cone 23. This air chamber not only helps to ensure uniform distribution of the flue gas but also provides a stable airflow environment for the subsequent drying process.

[0075] An air distribution plate 26 is installed inside the dryer 2 between the rotating cutter head 24 and the spiral feed inlet. The air distribution plate 26 is firmly connected to the main unit vertical cylinder 21 by welding, and has several guide holes that are wider at the top and narrower at the bottom. The design of these guide holes can accelerate the upward airflow inside the dryer 2, so that the high-temperature flue gas can pass through the air distribution plate 26 more efficiently and have sufficient contact and mixing with the molecular sieve powder.

[0076] When the high-temperature flue gas in the gas chamber forms a high-speed airflow under the combined action of the exhaust fan 7 and the high-speed rotating cutter head 24, this airflow passes through the guide holes on the air distribution plate 26 from bottom to top and is accelerated again at the guide holes. At this time, the molecular sieve powder is fed into the main unit's vertical cylinder 21 from the spiral feed port under the action of gravity, and collides fully with the high-speed airflow. Most of the molecular sieve powder is carried away by the airflow, while a small amount of agglomerated material passes through the guide holes, is deagglomerated under the impact of the high-speed rotating cutter head 24, and moves upward with the airflow. In this process, the high-temperature gas and the molecular sieve powder are fully mixed, completing heat and mass transfer, thereby achieving the ideal drying effect.

[0077] Furthermore, a reverse air cone 27 is installed inside the dryer 2 between the spiral feed port and the upper cone 22. The airflow carrying the molecular sieve powder impacts the reverse air cone 27, creating a reverse airflow. During this process, most of the lightweight molecular sieve powder particles will form a uniform air-material flow with the high-temperature flue gas, leaving the main unit vertical cylinder 21 and entering the upper cone 22. Larger molecular sieve powder particles, under the influence of gravity, will move downwards, where they will be stirred and broken up by the rising airflow, becoming lightweight molecular sieve powder particles, further improving the drying effect.

[0078] In this embodiment, a cleaning port 232 is also provided on the lower vertebral body 23. The design of the cleaning port 232 facilitates regular cleaning and maintenance of the interior of the lower vertebral body 23. The cleaning port 232 can easily remove impurities and residues accumulated inside the lower vertebral body 23, ensuring long-term stable operation of the equipment and also helping to extend the service life of the equipment.

[0079] The dryer 2 provided in this embodiment has significant advantages over commonly used airflow drying technology in the industry. This dryer features a specially designed rotating cutter head and air distribution plate structure, which can effectively break down agglomerated particles in the material, thereby significantly improving drying intensity and efficiency. Furthermore, this dryer has optimized height space utilization; compared to traditional airflow drying equipment, it requires 40% less height space, making the equipment more compact and suitable for a wider range of applications.

[0080] Compared to flash dryers used in the industry, this dryer features reduced main unit speed and power, resulting in lower energy consumption and a smaller footprint. Furthermore, it has no special requirements regarding airflow entry methods, demonstrating greater compatibility. Notably, this dryer and its corresponding drying system can operate under both positive and negative pressure, whereas airflow drying and flash drying typically require a blower.

[0081] In addition, the dryer 2 in this embodiment is not limited to using waste heat from exhaust gas for drying; it can also use an independent heat source for drying. This flexibility allows the dryer to perform excellently under various operating conditions.

[0082] In summary, the embodiments of the present invention achieve the following technical effects:

[0083] 1. By using the dehumidification devices of the dryer and rotary kiln, the moisture content of the material entering the roasting zone of the rotary kiln is reduced, thus shortening the roasting time of the material; this can effectively reduce the problem of the material sticking to the kiln wall due to high moisture content.

[0084] 2. Using natural gas as the production energy source significantly reduces unit energy consumption compared to electricity. Simultaneously, utilizing the high-temperature flue gas generated by the rotary kiln combustion as the heat source for the dryer fully leverages the heat of natural gas, improving efficiency and reducing energy consumption.

[0085] 3. By applying equipment such as exhaust cyclones, dehumidification cyclones, exhaust dust collectors, dehumidification dust collectors, exhaust fans, and dehumidification fans, a pneumatic conveying system is formed, which reduces material exposure and improves the production environment; it also solves the problem of having too many horizontal and vertical conveying devices, and forms a closed loop through pipeline connections, reducing the floor space required.

[0086] 4. Increased the output of a single production line, reaching 3500t per line.

[0087] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0088] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0089] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0090] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A production process for molecular sieve activated powder using a rotary kiln, characterized in that, The components include a rotary kiln, a dryer, an exhaust cyclone separator, and a dehumidification cyclone separator. The steps are as follows: 1) Drying pretreatment step: Molecular sieve raw powder is fed into the dryer through the feed port. The high-temperature flue gas generated by the combustion of the rotary kiln enters the dryer through the exhaust pipe and mixes with the molecular sieve raw powder in the dryer to form powder-containing flue gas. The powder-containing flue gas is discharged from the discharge port of the dryer and flows into the exhaust cyclone along the outlet duct. 2) Initial gas-solid separation step: The flue gas cyclone separator separates the material from the flue gas containing powder. The separated material flows out from the outlet of the flue gas cyclone separator and enters the feeding device of the rotary kiln. The separated flue gas is discharged from the exhaust outlet of the flue gas cyclone separator and enters the flue gas dust collector. The flue gas dust collector performs secondary separation of the material in the flue gas. The gas after secondary separation is discharged through the flue gas fan. The material after secondary separation flows back to the flue gas cyclone separator through the pipeline. 3) Secondary drying step: After the material in the feeding device enters the rotary kiln, it undergoes secondary drying. The secondary drying will generate moisture containing the material. The moisture is discharged from the exhaust port of the exhaust device and enters the exhaust cyclone separator. The exhaust cyclone separator separates the material from the humid gas. The separated material flows back to the feeding device through a pipeline, and the separated humid gas enters the exhaust dust collector through a pipeline. The exhaust dust collector performs secondary separation of the material from the humid gas. The gas after secondary separation is discharged by the exhaust fan, and the material after secondary separation flows back to the exhaust cyclone separator through a pipeline. 4) Calcination step: After secondary drying, the material enters the calcination zone of the rotary kiln, where the combustion system of the rotary kiln calcines the material to form molecular sieve activated powder. 5) Cooling and conveying steps: The molecular sieve activated powder enters the cooling zone of the rotary kiln, is discharged from the discharge port of the rotary kiln, and enters the water-cooled screw conveyor for cooling and conveying.

2. The production process according to claim 1, characterized in that: The dryer is equipped with a feeding screw conveyor at its feeding port, and the screw discharge port of the feeding screw conveyor is located inside the dryer. The upper end of the dryer is an upper cone, and the discharge port of the dryer is located on the upper cone. The lower end of the dryer is a lower cone, and a flue gas inlet connected to the exhaust pipe is provided on the lower cone. The dryer is equipped with a rotating cutter head located below the screw discharge port. The rotating cutter head can rotate at high speed under the drive mechanism and form an upward airflow.

3. The production process according to claim 2, characterized in that: The feeding screw conveyor has a small bag feed inlet and a ton bag feed inlet. The small bag feed inlet is used for feeding small bags, and the ton bag feed inlet is used for feeding ton bags.

4. The production process according to claim 3, characterized in that: The ton bag inlet is equipped with a support frame and a ton bag vent. The support frame is used to place the ton bag, and the ton bag vent is connected to the main channel for ton bag feeding.

5. The production process according to claim 2, characterized in that: The drive mechanism includes a mounting frame, on which a bearing housing is provided. A transmission shaft connected to a rotating cutter head is provided inside the bearing housing. A drive motor is provided on the mounting frame, and the drive motor and the transmission shaft are driven by a belt. A packing seal is provided between the bearing housing and the lower cone body. A compressed gas channel is provided inside the bearing housing to form an air seal between the bearing housing and the lower cone body.

6. The production process according to claim 5, characterized in that: The mounting bracket is equipped with an oil pump for cooling and lubricating the bearing housing.

7. The production process according to claim 2, characterized in that: A reverse air cone is provided between the spiral discharge port and the upper cone body. The reverse air cone is used to block the rising airflow and form a reverse airflow.

8. The production process according to claim 2, characterized in that: The flue gas inlet is located on the inclined surface of the lower vertebra and is distributed at a 90° angle to the inclined surface, and is directly opposite the central axis of the lower vertebra.

9. The production process according to claim 2, characterized in that: An air distribution plate is installed inside the dryer between the rotating cutter head and the spiral feed inlet. The air distribution plate has several guide holes that are wider at the top and narrower at the bottom to accelerate the airflow from bottom to top inside the dryer.

10. The production process according to claim 1, characterized in that: The combustion system is fueled by natural gas and includes multiple burners, each equipped with a set of control devices to operate independently.

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