Production process for realizing molecular sieve activated powder by adopting rotary kiln

Abstract

The invention discloses a process for producing molecular sieve activated powder by adopting a rotary kiln, and relates to equipment such as a rotary roasting kiln, a drying machine, a smoke discharge cyclone and a moisture discharge cyclone. The process comprises the following steps: mixing molecular sieve raw powder with high-temperature flue gas generated by a rotary calcining kiln through a drying machine to form powder-containing flue gas, feeding the powder-containing flue gas into a smoke discharge cyclone for primary gas-solid separation, feeding the separated material into a feeding device, discharging the flue gas after secondary separation through a smoke discharge dust remover, and refluxing the material to the smoke discharge cyclone; the materials are subjected to secondary drying in the rotary roasting kiln to form moisture containing the materials, the moisture is subjected to gas-solid separation of a moisture removal cyclone and separation treatment of a moisture removal dust remover, gas is discharged, and the materials flow back; the secondarily-dried material enters a roasting area to be roasted to form activated powder, and the activated powder is cooled by a cooling area and then conveyed by a water-cooling screw conveyor. The process reduces the water content and roasting time of materials, takes natural gas as energy, reduces energy consumption, utilizes high-temperature flue gas as a heat source, improves efficiency, improves the environment through a pneumatic conveying system, and reduces the occupied area.

Description

Technical Field

[0001] The present invention belongs to the fields of roasting and drying processes of molecular sieve activated powder and related equipment, and relates to a production process for molecular sieve activated powder using a rotary kiln. Background Art

[0002] Molecular sieve activated powder is obtained by high-temperature roasting of molecular sieve raw powder. Since most of the water in the molecular sieve raw powder is lost during the high-temperature roasting process, the activated powder has strong activity and can be directly used as an adsorbent with selective adsorption in production. It can be used to adsorb impurities such as H2O, CO2, and H2S generated during the production process and is an excellent amorphous adsorbent.

[0003] However, the roasting of molecular sieve activated powder has strict requirements for temperature. Once the temperature is too high, the spatial structure of the molecular sieve will be damaged, resulting in dead roasting; if the temperature is too low, the structural water cannot be discharged, affecting the adsorption effect. Therefore, in the production process of activated powder, roasting is the most important link, and currently, the roasting equipment in the industry is a roller hearth kiln or a tunnel kiln.

[0004] In the production process of the existing roller hearth kiln or tunnel kiln, the molecular sieve raw powder is put into a steel box by mechanical or manual means, and the box is sent into the roller hearth kiln or tunnel kiln by rolling on rollers or hydraulic pushing. The box moves forward continuously in the kiln, and the molecular sieve raw powder successively undergoes preheating, drying, roasting, cooling until it leaves the kiln body. After leaving the kiln body, the activated raw powder in the box is poured out under mechanical or manual operation. In this process, the molecular sieve activated powder takes the molecular sieve raw powder as the raw material and removes free water and structural water in stages at an appropriate temperature. In industrial production, a pusher kiln is mostly used. Since the molecular sieve raw powder is sensitive to temperature, electric energy is mostly used as the energy source at present. The output using a pusher kiln is relatively small, usually 200 - 500 tons per year.

[0005] At the same time, the existing production equipment for molecular sieve activated powder has more horizontal and vertical conveying equipment, resulting in a large floor area of the workshop; most of them are semi-open environments, with poor production environments and the dust collection products cannot be utilized; the electric energy utilization efficiency is low, the unit price is high, and the unit energy consumption cost is high; the length of the main equipment is too long, the machining difficulty is large, and the equipment investment is high. Summary of the Invention

[0006] The purpose of the present invention is to provide a production process for molecular sieve activated powder using a rotary kiln, a molecular sieve activated powder device based on natural gas as fuel, which solves the problem of unstable temperature control of the gas kiln, reduces the production energy consumption of molecular sieve activated powder, and increases the output of molecular sieve activated powder.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A production process for molecular sieve activated powder using a rotary kiln, including a rotary roasting kiln, a dryer, a smoke exhaust cyclone and a moisture exhaust cyclone, the steps are as follows:

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

[0010] 2) Primary gas-solid separation step: The smoke exhaust cyclone separates the materials and the flue gas in the powder-containing flue gas. The separated materials flow out from the discharge port of the smoke exhaust cyclone and enter the feeding device of the rotary roasting kiln. The separated flue gas is discharged from the exhaust port of the smoke exhaust cyclone and enters the smoke exhaust dust collector. The smoke exhaust dust collector performs secondary separation of the materials in the flue gas. The gas after secondary separation is discharged through the smoke exhaust fan, and the materials after secondary separation are returned to the smoke exhaust cyclone through the pipeline;

[0011] 3) Secondary drying step: The materials in the feeding device enter the rotary roasting kiln for secondary drying. Secondary drying will generate moisture containing materials (the moisture contains about 30% of the materials fed into the feeding device). The above moisture is discharged from the moisture discharge port of the moisture discharge device and enters the moisture exhaust cyclone; The moisture exhaust cyclone performs primary separation of the materials and the moisture-containing gas in the moisture. The separated materials are returned to the feeding device through the pipeline, and the separated moisture-containing gas enters the moisture exhaust dust collector through the pipeline; The moisture exhaust dust collector performs secondary separation of the materials in the moisture-containing gas. The gas after secondary separation is discharged through the moisture exhaust fan, and the materials after secondary separation are returned to the smoke exhaust cyclone through the pipeline;

[0012] 4) Roasting step: The materials after secondary drying (about 70% of the materials fed into the feeding device) enter the roasting area of the rotary roasting kiln, and the materials are roasted by the combustion system of the rotary roasting kiln to form molecular sieve activated powder;

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

[0014] As a further improvement of an embodiment of the present invention, a feeding screw conveyor is provided at the feeding port of the dryer, and the spiral feeding port of the feeding screw conveyor is located inside the dryer; The upper end of the dryer is an upper conical body, the discharge port of the dryer is located on the upper conical body, the lower end of the dryer is a lower conical body, and a flue gas inlet connected to the smoke exhaust pipe is provided on the lower conical body; A rotary cutter head is provided on the dryer below the spiral feeding port, and the rotary cutter head can rotate at high speed under the drive of a drive mechanism to form an upward air flow.

[0015] As a further improvement of an embodiment of the present invention, the feeding screw conveyor has a small-pack feeding port and a bulk-bag feeding port. The small-pack feeding port is used for small-pack feeding, and the bulk-bag feeding port is used for bulk-bag feeding.

[0016] As a further improvement of an embodiment of the present invention, a mounting frame and a bulk-bag exhaust port are provided at the bulk-bag feeding port. The mounting frame is used for placing the bulk-bag, and the bulk-bag exhaust port is communicated with the main channel of the bulk-bag feeding.

[0017] As a further improvement of an 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 rotary cutter head is provided in the bearing seat. A driving motor is provided on the mounting frame, and the driving motor is belt-driven with the transmission shaft; a stuffing box seal is provided between the bearing seat and the lower cone, and a compressed gas channel is provided in the bearing seat to form an air seal between the bearing seat and the lower cone.

[0018] As a further improvement of an embodiment of the present invention, an oil pump for cooling and lubricating the bearing seat is provided on the mounting frame.

[0019] As a further improvement of an embodiment of the present invention, an air-reversing cone is provided between the spiral discharging port and the upper cone. The air-reversing cone is used to block the upward airflow and form a reverse airflow.

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

[0021] As a further improvement of an embodiment of the present invention, a air distribution plate is provided in the dryer between the rotary cutter head and the spiral discharging port. A number of diversion holes that are wider at the top and narrower at the bottom are provided on the air distribution plate, which is used to accelerate the airflow from bottom to top in the dryer.

[0022] As a further improvement of an embodiment of the present invention, the fuel of the combustion system is natural gas, which includes multiple burners, and each burner is equipped with a set of control equipment to work independently.

[0023] Adopting the above technical solution, the following beneficial effects are achieved:

[0024] 1. Through the moisture discharge devices of the dryer and the rotary roasting kiln, the moisture content of the material entering the roasting area of the rotary roasting kiln is reduced, and the roasting time of the material is reduced;

[0025] 2. Using natural gas as the production energy source, compared with electric energy, the unit energy consumption cost is significantly reduced; at the same time, the high-temperature flue gas generated by the combustion of the rotary roasting kiln is used as the heat source of the dryer, making full use of the heat of natural gas, improving efficiency and reducing energy consumption;

[0026] 3. Through the application of equipment such as the smoke exhaust cyclone, moisture exhaust cyclone, smoke exhaust dust collector, moisture exhaust dust collector, smoke exhaust fan and moisture exhaust fan, a pneumatic conveying system is formed, reducing the exposure of materials and improving the production environment; solving the problem of having more horizontal and vertical conveying equipment, connecting through pipelines to form a closed loop, and reducing the floor area;

[0027] 4. The output of a single production line is increased, and a single production line reaches 3500t. Brief Description of the Drawings

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained according to the provided drawings.

[0029] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change in the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention.

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

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

[0032] Figure 3 It is a schematic diagram of a structure of a ton bag feeding port provided by the present invention.

[0033] In the figure:

[0034] 1. Rotary roasting kiln; 11. Feeding device; 12. Moisture exhaust device; 13. Roasting area; 14. Cooling area;

[0035] 2. Dryer;

[0036] 21. Main body vertical cylinder;

[0037] 22. Upper conical body;

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

[0039] 24. Rotary cutter head;

[0040] 251. Mounting frame; 252. Bearing seat; 253. Transmission shaft; 254. Driving motor; 255. Oil pump; 256. Compressed gas passage;

[0041] 26. Air distribution plate;

[0042] 27. Inverted air cone;

[0043] 3. Exhaust gas cyclone;

[0044] 4. Exhaust gas cyclone;

[0045] 5. Moisture exhaust cyclone;

[0046] 6. Exhaust gas dust collector;

[0047] 7. Moisture exhaust dust collector;

[0048] 8. Exhaust gas fan;

[0049] 9. Moisture exhaust fan;

[0050] 9. Feeding screw conveyor; 91. Small bag feeding port; 92. Tonne bag feeding port; 93. Tonne bag exhaust port;

[0051] 10. Water-cooled screw conveyor;

[0052] 101. Outlet air duct; 102, 103, 104, 105. Pipelines; 106. Exhaust pipe. Detailed implementation manners

[0053] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0054] It should be pointed out that unless otherwise specified, all technical and scientific terms used in this application have the same meanings as those commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0055] In the present invention, unless otherwise stated, the orientation words such as "upper, lower, top, bottom" are usually in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contours of the components themselves, but the above orientation words are not used to limit the present invention.

[0056] Embodiment

[0057] See Figure 1 As shown, a production process for molecular sieve activated powder using a rotary kiln includes a rotary roasting kiln 1, a dryer 2, a flue gas cyclone 3, and a moisture exhaust cyclone 4. The steps are as follows:

[0058] Step 1, drying pretreatment step: Molecular sieve raw powder is fed into the dryer 2 from the feeding port. The high-temperature flue gas generated by the combustion of the rotary roasting kiln 1 enters the dryer 2 through the exhaust pipe 106 and mixes with the molecular sieve raw powder in the dryer 2 to form a high-concentration powder-containing flue gas. This powder-containing flue gas is discharged from the discharge port of the dryer 2 and flows into the flue gas cyclone 3 along the outlet air pipe 101.

[0059] Step 2, primary gas-solid separation step: The flue gas cyclone 3 separates the materials from the powder-containing flue gas once to obtain a low-concentration powder-containing flue gas and partially dried molecular sieve raw powder, completing 80% of the material collection. Among them, the separated materials (molecular sieve raw powder) flow out from the discharge port of the flue gas cyclone 3 and enter the feeding device 11 of the rotary roasting kiln 1 through a pipeline. The separated flue gas (low-concentration powder-containing flue gas) is discharged from the exhaust port of the flue gas cyclone 3 and enters the flue gas dust collector 5 through the pipeline 102. The flue gas dust collector 5 performs a secondary separation of the materials from the flue gas. After this separation, 99.99% of the material collection is completed, obtaining qualified gas and molecular sieve raw powder. The gas after the secondary separation (qualified gas) is discharged to the chimney through the flue gas fan 7, and the materials after the secondary separation (molecular sieve raw powder) flow back to the flue gas cyclone 3 through the pipeline 104.

[0060] Step 3, secondary drying step: The materials in the feeding device 11 enter the rotary roasting kiln 1 for secondary drying. The secondary drying generates moisture containing materials (the moisture contains approximately 30% of the materials fed into the feeding device). The above moisture is discharged from the moisture exhaust port of the moisture exhaust device 12 and enters the moisture exhaust cyclone 4 through the moisture exhaust pipe. The moisture exhaust cyclone 4 separates the materials from the moisture-containing gas once, completing 80% of the material collection. The separated materials flow back to the feeding device 11 through a pipeline, and the moisture-containing gas after separation enters the moisture exhaust dust collector 6 through the pipeline 103. The moisture exhaust dust collector 6 performs a secondary separation of the materials from the moisture-containing gas. After this separation, 99.99% of the material collection is completed. The gas after the secondary separation is discharged to the chimney through the moisture exhaust fan 8, and the materials after the secondary separation flow back to the flue gas cyclone 3 through the pipeline 105.

[0061] Step 4, roasting step: The materials after secondary drying (approximately 70% of the materials fed into the feeding device) enter the roasting zone 13 (heating zone) of the rotary roasting kiln 1, and the materials are roasted by the combustion system of the rotary roasting kiln 1 to form molecular sieve activated powder. The above combustion system uses natural gas as the production energy, and compared with electric energy, the unit energy consumption cost is significantly reduced.

[0062] Step 5, Cooling and Conveying Step: The molecular sieve activated powder enters the cooling zone 14 of the rotary roasting kiln 1 and is discharged from the discharge port of the rotary roasting kiln 1 into the water-cooled screw conveyor 10 for cooling and conveying, so that the molecular sieve activated powder enters the next stage of screening and packaging process.

[0063] In this embodiment, the combustion system adopts a configuration of multiple burners, and each burner can work independently. This design improves the flexibility and reliability of the combustion system. Each burner is equipped with a complete set of control equipment, specifically including a proportional regulating valve, a combustion controller, a temperature control meter, a thermocouple, and several valves. The proportional regulating valve is used to precisely control the mixing ratio of gas and air, and the combustion controller is responsible for monitoring the combustion process to ensure stable and efficient combustion. The temperature control meter monitors the combustion temperature in real time through the thermocouple and automatically adjusts the valve opening according to the set value to maintain a stable combustion temperature.

[0064] The high-temperature flue gas generated after combustion is discharged through the smoke exhaust port of the rotary roasting kiln 1. Under the suction of the smoke exhaust fan 7, the flue gas enters the dryer 2 along the smoke exhaust pipe 106. This design not only makes full use of the heat generated by combustion, but also improves the energy utilization efficiency, and at the same time ensures that the materials in the dryer 2 can be dried evenly and fully.

[0065] The present invention can effectively reduce the water content of the materials entering the roasting zone of the rotary roasting kiln 1 through the moisture discharge devices of the dryer 2 and the rotary roasting kiln 1. In the dryer 2, the molecular sieve raw powder is fully mixed with the high-temperature flue gas generated by the combustion of the rotary roasting kiln 1. The high-temperature flue gas transfers heat to the materials, causing the moisture in the materials to evaporate rapidly, forming a high-concentration powder-containing flue gas. This process not only removes most of the free moisture in the materials, but also makes the materials more prone to chemical reactions in subsequent processing. The moisture discharge device of the rotary roasting kiln 1 further performs secondary drying on the materials, and discharges the moisture through the moisture discharge port to ensure that the materials reach a lower water content before entering the roasting zone. The lower water content can significantly reduce the roasting time of the materials, because the evaporation of moisture requires a large amount of heat and time. After reducing the water content, the roasting process can focus more on the activation reaction of the molecular sieve, thereby improving the production efficiency.

[0066] This process uses natural gas as the production energy. Compared with electric energy, the unit energy consumption cost is significantly reduced. 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 the rotary roasting kiln 1. At the same time, the high-temperature flue gas generated by the combustion of the rotary roasting kiln 1 is fully utilized as the heat source of the dryer 2, realizing the cascade utilization of heat. This way of making full use of heat not only improves the energy utilization efficiency, but also reduces the overall energy consumption, making the production process more economical and environmentally friendly.

[0067] In terms of material transportation, a complete pneumatic conveying system has been formed through the application of equipment such as the smoke exhaust cyclone 3, the moisture exhaust cyclone 4, the smoke exhaust dust collector 5, the moisture exhaust dust collector 6, the smoke exhaust fan 7, and the moisture exhaust fan 8. The system connects each device through pipelines to form a closed loop, reducing the exposure of materials and effectively improving the production environment. At the same time, the pneumatic conveying system solves the problem of having more traditional horizontal and vertical conveying devices, reducing the floor area and making the production line more compact and efficient.

[0068] Through the optimization and improvement of the above process, the output of a single production line has been significantly increased, reaching 3500t. Such a high-output production line can meet the large market demand for molecular sieve activated powder while reducing production costs.

[0069] The present invention optimizes the design of the dryer 2 to better achieve the drying treatment of molecular sieve raw powder. The specific structure is as Figure 2 shown. The dryer 2 includes a main body vertical cylinder 21, an upper cone 22 located at the upper end of the main body vertical cylinder, and a lower cone 23 located at the lower end of the main body vertical cylinder. A feeding screw conveyor 9 is provided at the feeding port of the dryer 2, and the spiral discharging 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. A flue gas inlet 231 connected to the smoke exhaust pipe 106 is provided on the lower cone 23, enabling the high-temperature flue gas generated by the combustion of the rotary roasting kiln 1 to smoothly enter the dryer 2.

[0070] A rotating cutter head 24 is arranged inside the dryer 2 below the spiral discharging port. Driven by a driving mechanism, the rotating cutter head 24 can rotate at a high speed and form an upward airflow. This design not only helps the molecular sieve raw powder to be fully dispersed inside the dryer 2 but also enables the high-temperature flue gas to contact the material more fully, thereby improving the drying efficiency. At the same time, the cutting and stirring effects of the rotating cutter head 24 also help to break up material agglomerates and further promote the drying process.

[0071] Furthermore, fixing ears are provided on the main body vertical cylinder 21 for fixing the dryer 2. The driving mechanism includes a mounting frame 251, on which a bearing seat 252 is arranged. A transmission shaft 253 connected to the rotating cutter head 24 is installed inside the bearing seat 252. The transmission shaft 253 is responsible for transmitting power to the rotating cutter head 24 to enable it to rotate at a high speed. At the same time, a packing seal is adopted between the bearing seat 252 and the lower cone 23, and a compressed gas channel 256 is arranged inside the bearing seat 252 to form an air seal between the bearing seat 252 and the lower cone 23, further enhancing the sealing effect and ensuring no powder leakage at the joint.

[0072] To drive the transmission shaft 253, a driving motor 254 is provided on the mounting bracket 251. A belt drive (such as a V-belt) is adopted between the driving motor 254 and the transmission shaft 253, and this transmission method has the characteristics of simple structure and stable transmission.

[0073] In addition, to extend the service life of the bearing block 252, an oil pump 255 is also provided on the mounting bracket 251. The oil pump 255 is responsible for supplying cooling and lubricating grease to the bearing block 252 to ensure that the bearing block 252 can maintain a good working state during high-speed operation, reducing wear and the occurrence of faults. This design not only improves the reliability of the driving mechanism but also reduces the maintenance cost.

[0074] In this embodiment, the feeding screw conveyor 9 is designed with a through-long shaft, which passes through the main body vertical cylinder 21, and a bearing block is configured on the other side of the main body vertical cylinder. Such a 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 feeding port 91 and a ton-bag feeding port 92 to meet the feeding requirements of different packaging specifications.

[0075] Specifically, the small-bag feeding port 91 is equipped with a special cover plate and fence. This design can not only prevent the material from splashing during the feeding process but also adapt to the feeding of small-packaged materials within 25 kg, improving the flexibility and convenience of feeding. Figure 3 As shown, the ton-bag feeding port 92 is provided with a seat frame and a ton-bag exhaust port 93. The seat frame is used to stably place the ton-bag, ensuring the smoothness of the feeding process; the ton-bag exhaust port 93 is connected to the main channel of the ton-bag feeding, and can effectively discharge the air in the ton-bag during the feeding process, avoiding the blockage of the material due to air compression, thus ensuring the smoothness of the ton-bag feeding.

[0076] In this embodiment, the flue gas inlet 231 is arranged on the inclined surface of the lower cone 23, and is distributed at 90° with this inclined surface, and is also directly opposite to the central axis of the lower cone 23. Such a design enables the flue gas to smoothly enter the lower cone 23, and together with the rotating cutter head 24, a unique air chamber is formed at the lower cone 23. This air chamber not only helps the uniform distribution of the flue gas but also provides a stable air flow environment for the subsequent drying process.

[0077] A air distribution plate 26 is arranged in the dryer 2 between the rotating cutter head 24 and the spiral feeding port. The air distribution plate 26 is firmly connected to the main body vertical cylinder 21 by welding, and is provided with a number of diversion holes that are wider at the top and narrower at the bottom. The design of these diversion holes can accelerate the upward air flow in the dryer 2, enabling the high-temperature flue gas to more efficiently pass through the air distribution plate 26 and make full contact and mixing with the molecular sieve raw powder.

[0078] When high-temperature flue gas in the air chamber forms a high-speed airflow under the dual action of the exhaust fan 7 and the high-speed rotating cutter head 24, this airflow will pass through the diversion holes on the air distribution plate 26 from bottom to top and be further accelerated at the diversion holes. At this time, the molecular sieve raw powder is fed into the main machine vertical cylinder 21 from the spiral feeding port under the action of gravity and collides fully with the high-speed airflow. Most of the molecular sieve raw powder is carried away by the airflow, while a small amount of agglomerated materials will pass through the diversion holes, be depolymerized under the impact of the high-speed rotating cutter head 24, and move upward with the airflow. In this process, the high-temperature gas is fully mixed with the molecular sieve raw powder to complete heat transfer and mass transfer, thus achieving an ideal drying effect.

[0079] Furthermore, an inverted air cone 27 is arranged inside the dryer 2 between the spiral feeding port and the upper cone 22. The airflow carrying the molecular sieve raw powder will impact on the inverted air cone 27 and form a reverse airflow. In this process, most of the light molecular sieve raw powder particles will form a uniform gas-solid flow with the high-temperature flue gas and leave the main machine vertical cylinder 21 to enter the upper cone 22. The slightly larger molecular sieve raw powder particles will move downward under the influence of gravity, be stirred and broken by the rising airflow, and become light molecular sieve raw powder particles, further improving the drying effect.

[0080] In this embodiment, a cleaning port 232 is also arranged on the lower cone 23. The design of this cleaning port 232 facilitates regular cleaning and maintenance of the inside of the lower cone 23. Through the cleaning port 232, the impurities and residues accumulated inside the lower cone 23 can be conveniently removed, ensuring the long-term stable operation of the equipment and also contributing to extending the service life of the equipment.

[0081] The dryer 2 provided in this embodiment has significant advantages compared with the commonly used pneumatic drying technology in the industry. This dryer is specially designed with a rotating cutter head and an air distribution plate structure, which can effectively break the agglomerated particles in the material, thus significantly improving the drying intensity and efficiency. In addition, the dryer has been optimized in terms of height space utilization. Compared with traditional pneumatic drying equipment, the required height space is reduced by 40%, making the equipment more compact and applicable to more scenarios.

[0082] Compared with the flash dryer used in the industry, the main machine speed and power of this dryer have been reduced, not only reducing the energy consumption but also reducing the floor area. At the same time, this dryer has no special requirements for the air inlet mode, showing greater compatibility. It is worth mentioning that this dryer and its corresponding drying system can operate either in a positive pressure mode or in a negative pressure mode, while pneumatic drying and flash drying usually require a blower.

[0083] In addition, the dryer 2 in this embodiment is not limited to drying using waste gas heat but can also use an independent heat source for drying. This flexibility enables this dryer to exhibit excellent performance under various working conditions.

[0084] In summary, the embodiments of the present invention achieve the following technical effects:

[0085] 1. Through the moisture exhaust devices of the dryer and the rotary roasting kiln, the moisture content of the material entering the roasting area of the rotary roasting kiln is reduced, and the roasting time of the material is shortened; the problem of sticking to the kiln wall caused by high moisture content of the material can be effectively reduced.

[0086] 2. Using natural gas as the production energy, compared with electric energy, the unit energy consumption cost is significantly reduced. At the same time, the high-temperature flue gas generated by the combustion of the rotary roasting kiln is used as the heat source of the dryer, making full use of the heat of natural gas, improving efficiency and reducing energy consumption;

[0087] 3. Through the application of equipment such as the smoke exhaust cyclone, moisture exhaust cyclone, smoke exhaust dust collector, moisture exhaust dust collector, smoke exhaust fan and moisture exhaust fan, a pneumatic conveying system is formed, reducing the exposure of the material and improving the production environment; the problem of having more horizontal and vertical conveying equipment is solved. Connected by pipelines to form a closed loop, the floor area is reduced.

[0088] 4. The output of a single production line is increased, and the output of a single production line reaches 3500t.

[0089] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0090] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0091] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above drawings 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 under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0092] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A production process for molecular sieve activated powder using a rotary kiln, characterized in that, It includes a rotary roasting kiln, a dryer, a smoke exhaust cyclone and a moisture exhaust cyclone, and the steps are as follows: 1) Drying pretreatment step: The molecular sieve raw powder is fed into the dryer from the feeding port. The high-temperature flue gas generated by the combustion of the rotary roasting kiln enters the dryer through the smoke exhaust pipe and mixes with the molecular sieve raw powder in the dryer to form a powder-containing flue gas. This powder-containing flue gas is discharged from the discharge port of the dryer and flows into the smoke exhaust cyclone along the outlet air duct; 2) Primary gas-solid separation step: The smoke exhaust cyclone separates the materials from the powder-containing flue gas. The separated materials flow out from the discharge port of the smoke exhaust cyclone and enter the feeding device of the rotary roasting kiln. The separated flue gas is discharged from the exhaust port of the smoke exhaust cyclone and enters the smoke exhaust dust collector. The smoke exhaust dust collector performs secondary separation of the materials from the flue gas. The gas after secondary separation is discharged through the smoke exhaust fan, and the materials after secondary separation are returned to the smoke exhaust cyclone through a pipeline; 3) Secondary drying step: The materials in the feeding device enter the rotary roasting kiln for secondary drying. The secondary drying generates moisture containing materials. The moisture is discharged from the moisture exhaust port of the moisture exhaust device and enters the moisture exhaust cyclone. The moisture exhaust cyclone performs primary separation of the materials from the moisture-containing gas. The separated materials are returned to the feeding device through a pipeline, and the separated moisture-containing gas enters the moisture exhaust dust collector through a pipeline. The moisture exhaust dust collector performs secondary separation of the materials from the moisture-containing gas. The gas after secondary separation is discharged through the moisture exhaust fan, and the materials after secondary separation are returned to the smoke exhaust cyclone through a pipeline; 4) Roasting step: The materials after secondary drying enter the roasting area of the rotary roasting kiln, and the materials are roasted by the combustion system of the rotary roasting kiln to form molecular sieve activated powder; 5) Cooling and conveying step: The molecular sieve activated powder enters the cooling area of the rotary roasting kiln, is discharged from the discharge port of the rotary roasting kiln and enters the water-cooled screw conveyor for cooling and conveying.

2. The production process according to claim 1, characterized in that: A feeding screw conveyor is arranged at the feeding port of the dryer, and the spiral discharging port of the feeding screw conveyor is located inside the dryer; the upper end of the dryer is an upper conical body, the discharge port of the dryer is located on the upper conical body, the lower end of the dryer is a lower conical body, and a flue gas inlet connected to the smoke exhaust pipe is arranged on the lower conical body; a rotary cutter head is arranged on the dryer below the spiral discharging port, and the rotary cutter head can rotate at a high speed under the drive of a drive mechanism to form an upward air flow.

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

4. The production process according to claim 3, characterized in that: A seat frame and a ton bag exhaust port are arranged at the ton bag feeding port. The seat frame is used for placing ton bags, and the ton bag exhaust port is communicated with the main channel of ton bag feeding.

5. The production process according to claim 2, characterized in that: The drive mechanism includes a mounting frame. A bearing seat is arranged on the mounting frame. A transmission shaft connected to the rotary cutter head is arranged inside the bearing seat. A drive motor is arranged on the mounting frame, and belt transmission is provided between the drive motor and the transmission shaft; packing sealing is provided between the bearing seat and the lower conical body, and a compressed gas channel is arranged inside the bearing seat to form a gas seal between the bearing seat and the lower conical body.

6. The production process according to claim 5, characterized in that: An oil pump for cooling and lubricating the bearing seat is provided on the mounting bracket.

7. The production process according to claim 2, characterized in that: An inverted air cone is provided between the spiral feeding port and the upper conical body. The inverted air cone is used to block the upward airflow and form a reverse airflow.

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

9. The production process according to claim 2, characterized in that: A air distribution plate is arranged in the dryer between the rotary cutter head and the spiral feeding port. A number of diversion holes that are wider at the top and narrower at the bottom are provided on the air distribution plate for accelerating the airflow from bottom to top in the dryer.

10. The production process according to claim 1, characterized in that: The fuel of the combustion system is natural gas, which includes multiple burners, and each burner is equipped with a set of control equipment to achieve independent operation.

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