Vibrating fluidized bed dryer

Product Introduction

The vibrating fluidized bed dryer developed, designed, and manufactured by Hengshui Changlong Machinery Equipment Co., Ltd. adopts a unique upper and lower split frame structure. During operation, the upper part of the bed does not vibrate, and the lower bed vibrates. It operates stably, has a low failure rate, is easy to maintain, and has a long continuous service life. Fully automated one click operation has been achieved, reducing manual labor and lowering operating costs for enterprises. More importantly, it has reduced the lag in human participation and the many drawbacks it brings to the system. Our company's series of vibrating fluidized bed dryers are widely used for drying, cooling, and humidifying powder and granular materials in industries such as chemical, light industry, pharmaceuticals, food, plastics, grain and oil, slag, salt production, and sugar manufacturing.

1、 Principle, purpose, and main features:

A vibrating fluidized bed dryer is a machine that generates excitation force from a vibration motor to make the bed vibrate. The material jumps forward under the action of the excitation force in the given direction, and at the same time, the hot air input from the bottom of the bed makes the material in a fluidized state. The material particles are fully in contact with the hot air, thus achieving the ideal drying effect.

The vibrating fluidized bed dryer overcomes the disadvantages of ordinary fluidized bed drying, such as uneven particle size, easy formation of channel flow and stagnation zone, severe entrainment, easy agglomeration, uneven product moisture content, material backmixing, and large residence time distribution range.

The vibrating fluidized bed dryer is widely used for drying and cooling powdered and granular materials in industries such as chemical, light industry, medicine, food, plastics, grain and oil, slag, distiller's grains, matches, salt production, tobacco and sugar, and compound fertilizers.

The vibrating fluidized bed dryer has the following main characteristics:

1. Fluidization is uniform and stable, without dead beds or blow through phenomena, and can achieve uniform drying and cooling of products.

2. The vibration source is a vibration motor, which runs smoothly, is easy to maintain, has low noise, and has a long equipment life.

3. Good adjustability, the thickness of the material layer, the dwell time of the material in the machine, and the amplitude of the bed can be infinitely adjusted within the design range.

4. Wide applicability, able to adapt to materials with different densities, particle sizes, moisture contents, and moisture forms.

5. It has minimal damage to the surface of the material and can be used for drying fragile materials. The material particles are irregular and do not affect the working effect.

6. The operating environment is clean and can be operated continuously.

7. High thermal efficiency and good energy-saving effect, saving 30% to 60% energy compared to general drying devices.

2、 Working conditions and environment for product use:

The heat source of the vibrating fluidized bed dryer can use steam (or thermal oil) heat exchangers, hot air stoves, and fuel gas flue gas stoves, and different temperatures of hot air can be used according to the different materials. The power supply for the motor used in the equipment is AC 380 volts.

The vibrating fluidized bed dryer, cyclone separator, and bag filter should be installed indoors to reduce heat loss during drying and condensation inside the reactor wall and on the surface of the filter bag. If the cyclone separator or backwash bag filter can only be installed outdoors, an external insulation layer needs to be added to the connecting pipes and equipment.

3、 Vibration fluidized bed model and technical parameters:

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4、 The main structure of the product:

The material is quantitatively fed (or manually or otherwise added) into the inlet of the vibrating fluidized bed dryer by a spiral feeder. The hot air generated by the heat exchanger (or other heat source equipment) flows from the lower box of the dryer, passes through the orifice plate, and mixes with the material for heat and mass exchange to complete the drying process. The product is discharged from the outlet of the dryer. Fine product particles are discharged from the upper end of the dryer along with the exhaust, undergo the first gas-solid separation through a cyclone separator, and then undergo the second gas-solid separation through a bag filter.

5、 Lifting and storage:

1. When lifting a vibrating fluidized bed dryer, it is necessary to avoid impact, which may cause the bed body to bend and the lower box to twist, affecting the vibration stability during operation.

2. When lifting the cyclone separator, it is necessary to avoid deformation caused by impact on the cylinder and cone, which may affect the gas-solid separation effect of the internal rotating airflow.

3. When lifting the blowback bag filter, it is also necessary to avoid deformation caused by the impact of the cylinder and cone, which may affect the gas-solid separation effect of the internal rotating airflow. To avoid deformation of the bag filter frame and damage to the filter bag during transportation.

4. During the lifting process of various fans, it is necessary to avoid impact on the motor shaft and transmission shaft, which may affect the balance of the fan impeller rotation.

5. During transportation and storage, all components should be protected from direct sunlight and rain as much as possible.

6、 Installation and Debugging:

1. The vibrating fluidized bed dryer must be installed on a horizontal foundation, with the bed and bracket fastened. After installing the lower box, the levelness of the orifice plate should be within the allowable range. The soft connecting pipes between the upper and lower boxes, as well as between the upper box and the exhaust pipe, should be sealed to prevent air and material leakage.

2. When installing the cyclone separator and backwash bag filter, it is necessary to ensure that the central axis is vertical, and the anchor bolts of the sturdy bracket should not shake; The clearance between the upper and lower valve plates of the discharge device and the overall structure should be kept as small as possible to ensure sealing and minimize the amount of material carried by the exhaust during discharge. If the cyclone separator and backwash bag filter are installed outdoors, the outer shell needs to be insulated (insulation is completed by the user).

3. The spiral feeder is installed on a sturdy platform, ensuring that the spiral blades do not rub or collide with the inner wall of the feeding housing when the spiral shaft rotates. The reducer and electromagnetic speed motor should be firmly installed on the platform, and the platform bracket should be sturdy with anchor bolts to ensure smooth operation of the reducer and electromagnetic speed motor.

4. Each fan should be fastened to the foundation with anchor bolts to ensure smooth operation and no abnormal impact sound.

5. The heat exchanger is placed on the foundation, and the inlet end should be higher than the outlet end to facilitate the smooth discharge of condensed water.

6. When connecting steam pipeline flanges, a heat-resistant asbestos pad or polytetrafluoroethylene pad should be placed in the middle, and consideration should be given to leaving elbows or expansion pipes that compensate for thermal expansion and contraction; When connecting the flange of the air duct, asbestos rope or rubber asbestos pad should be padded in the middle. All flange connection bolts of pipelines must be tightened to ensure no steam or air leakage.

7. Check whether the voltage and frequency of the power supply are 380V (or 220V) and 50HZ. After confirming that the power supply is correct, the power supply can be connected to the electrical control cabinet and various electrical components.

8. Adjust the speed of the spiral blade shaft of the spiral feeder to achieve the required amount of feed during smooth feeding.

9. Adjust the excitation force of the vibration motor to adjust the amplitude of the bed, so that the amplitude matches the material characteristics and hot air flow rate, and quickly achieve the fluidization requirements of the material.

10. By adjusting the position of the bolt connection holes on the vibration motor base plate and the lower box flange to change the vibration direction angle, the drying time of the material in the vibration fluidized bed dryer can be adjusted to achieve the final moisture content requirement of the product.

11. Adjust the steam valve of the heat exchanger to match the steam supply with the required hot air temperature and volume during drying.

12. On the premise of ensuring the required heat for drying, adjust the valves of the inlet pipes of the fan and vibrating fluidized bed dryer to achieve a slight positive pressure above the orifice plate when no material is added, and a slight negative pressure above the orifice plate when adding material, while achieving uniform fluidization.

7、 Usage and operation:

1. Before use, confirm that the voltage of the power supply meets the requirements and that there are no foreign objects inside each fan and screw feeder.

2. Open the induced draft fan, blower, and steam pipeline valves to generate hot air and preheat the drying system. At the same time, observe whether there are any air leaks at each connection. If there are any air leaks, tighten them in a timely manner (refer to their corresponding instructions when using other heat source equipment).

3. After reaching the preheating requirements, turn on the induced draft fan and adjust the valves of each air inlet to ensure that the drying system is in normal working air volume and heat state.

4. Turn on the vibration motor and observe whether the vibration of the box and bed is stable. If any unevenness is found, immediately turn off the vibration motor and identify the cause.

5. Turn on the electromagnetic speed control motor and adjust the speed of the screw blade shaft of the screw feeder. When starting to add raw materials, it is necessary to observe whether the feeding is uniform at all times and quantitatively enter the feeding port of the vibrating fluidized bed dryer (when adding materials in other ways, it should also strive for uniformity).

6. Turn on the reducer motor and reverse blower of the reverse blow bag filter to start the bag filter working.

7. Observe whether the product discharge from the outlet of the vibrating fluidized bed dryer is uniform, and regularly check the moisture content and output of the product.

8. Regularly discharge the cyclone separator and backwash bag filter. When not discharging, open the upper valve of the discharge device and close the lower valve to allow the material to directly enter the hopper; When discharging, first close the upper valve and then open the lower valve to achieve the effect of closing the air while discharging. The discharge interval of the cyclone separator should be shorter, and the discharge interval of the backwash bag filter can be longer. (Actual interval users can find patterns in production)

9. When the temperature is low, it is necessary to regularly observe whether there is condensation on the backwash bag filter. If there is condensation, the humidity of the hot air should be appropriately increased, and the material adhering to the outside of the bag during condensation should be removed to ensure the smoothness of air passing through the bag.

10. When the drying system stops working, first cut off the power supply of the electromagnetic speed regulating motor, so that the spiral feeder no longer adds materials (stops other ways of feeding). When the discharge port of the vibrating fluidized bed dryer no longer discharges materials, the power supply of the vibrating motor can be cut off, so that the vibrating fluidized bed dryer stops working; Close the steam pipeline valve and no longer generate hot air (refer to the corresponding instructions when using other heat sources), allowing the drying system to gradually cool down; Later, the power supply of the blower and other motors can be turned off, and the entire drying system will stop working.

11. This working method adopts a quantitative feeding, heat exchanger heat exchange, secondary dust collection, and no cooling working mode. According to different materials, manual or other methods can be used to add materials, with hot air supplied by a hot air stove or other heat source equipment, single-stage dust collection, and a working mode with a cooling section; Please refer to the corresponding manual when using.

12. This manual is written according to the conventional operating procedures for users' reference. For specific materials, users should gradually accumulate experience during use, find the best working parameters, and make the entire equipment reach the best working state.

8、 Maintenance and upkeep:

1. Routine maintenance should be carried out daily, such as adjusting the tension of the V-belt, adding lubricating grease, and strengthening the screws of vibrating parts.

2. Regularly clean the orifice plate bed of the vibrating fluidized bed dryer, eliminate blockages, and remove accumulated materials. Simultaneously open the lower discharge hole to clean the leakage material under the orifice plate.

3. Regularly inspect the filter bag for damage and loose connections, and eliminate material accumulation on the outer surface of the filter bag.

4. Check the soft connection parts every two weeks for any damage, and replace them promptly if there is any damage.

5. Each bearing should be cleaned every three months and the lubricating grease should be replaced.

6. Regularly check whether the discharge valves of the cyclone separator and backwash bag filter are tight. If any air leakage is found, it should be repaired in a timely manner.

7. For the maintenance and upkeep of electromagnetic speed regulating motors, fans, and reducers, please refer to the corresponding manuals.

9、 Common faults and troubleshooting methods:

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