The vibratory fluidized-bed dryer developed, designed, and manufactured by Hengshui Xinnuo Mechanical Technology Co., Ltd. features a unique split upper-and-lower frame structure: during operation, the upper section of the bed remains stationary while the lower section vibrates, ensuring stable performance, low failure rates, easy maintenance, and long service life under continuous operation.

Product Introduction

The vibratory fluidized-bed dryer developed, designed, and manufactured by Hengshui Xinnuo Mechanical Technology Co., Ltd. features a unique split upper-and-lower frame structure: during operation, the upper section of the bed remains stationary while the lower section vibrates, ensuring stable performance, low failure rates, easy maintenance, and long service life under continuous operation. The equipment supports fully automated one-button operation, which not only reduces labor requirements and lowers operating costs but, more importantly, minimizes human intervention and associated delays—factors that can introduce numerous operational drawbacks into the system. Our series of vibratory fluidized-bed dryers is widely applicable to drying, cooling, and humidifying powdered and granular materials across industries such as chemicals, light industry, pharmaceuticals, food, plastics, grain and oil processing, slag treatment, salt production, and sugar manufacturing.

Principle, Applications, and Main Features

• A vibratory fluidized-bed dryer uses a vibration motor to generate excitation forces that cause the bed to vibrate. Under the action of these unidirectional excitation forces, the material jumps and advances, while hot air introduced from the bottom of the bed fluidizes the material, ensuring thorough contact between the particles and the hot air and thereby achieving optimal drying performance.
• The vibrating fluidized-bed dryer overcomes the shortcomings of conventional fluidized-bed drying, such as channeling and dead zones caused by non-uniform particle size, severe entrainment, caking, uneven product moisture content, material backmixing, and a broad residence-time distribution.
• Vibrating fluidized-bed dryers are widely used in industries such as chemicals, light industry, pharmaceuticals, food, plastics, grain and oil, slag, distiller’s grains, matches, salt production, tobacco and sugar manufacturing, and compound fertilizer production for drying and cooling powdered and granular materials.

The vibrating fluidized-bed dryer has the following main features:

• Fluidization is uniform and stable, with no dead beds or channeling, enabling consistent drying and cooling of the product.
• The vibration source is a vibration motor, which offers smooth operation, easy maintenance, low noise, and long equipment life.
• Excellent adjustability: the material layer thickness, the residence time of the material within the machine, and the vibration amplitude of the bed can all be continuously adjusted within the design range.
• It has a wide range of applicability and can handle materials with varying specific gravities, particle sizes, moisture contents, and moisture states.
• It causes minimal damage to the material surface, making it suitable for drying fragile materials; even irregularly shaped particles do not affect the drying performance.
• The operating environment is clean, enabling continuous operation.
• High thermal efficiency and excellent energy-saving performance, with energy savings of 30% to 60% compared with conventional drying equipment.

Operating conditions and working environment for product use

The heat source for the vibrating fluidized-bed dryer can be a steam (or thermal oil) heat exchanger, a hot-air furnace, or an oil- or gas-fired flue-gas furnace, with the hot-air temperature adjusted according to the specific material being dried. The power supply for the equipment’s motors is 380 V AC.

The vibratory fluidized-bed dryer, cyclone separator, and baghouse filter shall all be installed indoors to minimize heat loss during drying and to prevent condensation on the inner walls of the equipment and on the surfaces of the filter bags. If the cyclone separator or the reverse-air bag filter must be installed outdoors, the connecting piping and associated equipment shall be provided with external thermal insulation.

Vibrating Fluidized Bed Models and Technical Specifications

Model	Fluidized bed area (m 2 )	Inlet air temperature (°C)	Outlet air temperature (°C)	Evaporation capacity (kg/h)	Vibration motor
					Model	Power
GZL3×30	0.9	70–140	40–70	20–35	YZO10-6	0.8 × 2
GZL3×45	1.35	70–140	40–70	35–50	YZO10-6	0.8 × 2
GZL45×45	2.025	70–140	40–70	50–70	YZO10-6	0.8 × 2
GZL4.5×60	2.7	70–140	40–70	70–90	YZO20-6	2.0 × 2
GZL6×60	3.6	70–140	40–70	100–130	YZO20-6	2.0 × 2
GZL6×75	4.5	70–140	40–70	120–140	ZDS30-6	2.5 times 2
GZL6×90	5.4	70–140	40–70	140–170	ZDS30-6	2.5 times 2
GZL9×60	5.4	70–140	40–70	130–150	ZDS30-6	2.5 times 2
GZL9×75	6.75	70–140	40–70	150–180	ZDS40-6	3.0×2
GZL12×75	0.9	70–140	40–70	160–210	ZDS40-6	3.0×2
GZL15×75	11.25	70–140	40–70	200–260	ZDS50-6	3.7 × 2
GZL15×90	13.5	70–140	40–70	250–300	ZDS50-6	3.7 × 2

Main Structure

The material is fed in a metered manner—either manually or by other means—into the inlet of the vibratory fluidized-bed dryer via a screw feeder. Hot air generated by a heat exchanger (or other heat-source equipment) enters the lower chamber of the dryer, passes through a perforated plate to mix with the material, and facilitates heat and mass transfer to complete the drying process. The dried product is discharged from the dryer outlet. Fine product particles are carried away with the exhaust air at the top of the dryer, undergo primary gas–solid separation in a cyclone separator, and then undergo secondary gas–solid separation in a baghouse filter.

Lifting and Storage

1. When lifting and transporting the vibrating fluidized-bed dryer, avoid impacts that could cause bending of the bed plates or distortion of the lower casing, as such damage would compromise the stability of the vibration during operation.

2. When lifting and transporting the cyclone separator, avoid impacts on the cylindrical and conical sections that could cause deformation, thereby compromising the gas–solid separation performance of the internal rotating airflow.

3. During lifting and handling of the reverse-air bag filter, care must be taken to prevent impact between the cylindrical and conical sections, which could cause deformation and compromise the gas–solid separation performance due to the internal swirling airflow. Additionally, deformation of the bag-filter frame and damage to the filter bags must be avoided during transportation.

4. During lifting and transportation, all types of fans must be protected from impacts to the motor shaft and drive shaft to prevent compromising the balance of the fan impeller during rotation.

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

Installation and Commissioning

1. The vibratory fluidized-bed dryer must be installed on a level foundation, with the bed frame and support structure securely fastened. Upon completion of the lower casing installation, the horizontal alignment of the perforated plate shall be within the permissible tolerance. Flexible connecting ducts between the upper and lower casings, as well as between the upper casing and the exhaust pipe, must be tightly sealed to prevent air leakage and material spillage.

2. During installation of the cyclone separator and the reverse-air bag filter, ensure that the central axis is vertical and securely fasten the anchor bolts of the supporting structure to prevent any rocking or vibration. The clearance between the upper and lower valve plates of the discharge device should be as small as possible to ensure a tight seal, thereby minimizing entrainment of material by the exhaust airflow during discharge. If the cyclone separator and the reverse-air bag filter are installed outdoors, the outer casing must be thermally insulated (insulation to be provided by the user).

3. The screw feeder shall be installed on a solid foundation, ensuring that, during rotation, the screw flights do not rub against or impact the inner wall of the feed housing. The reducer and the electromagnetic speed-control motor must be securely mounted on the platform, and the platform supports must be firmly anchored with anchor bolts to ensure smooth operation of the reducer and the electromagnetic speed-control motor.

4. Each fan shall be securely fastened to the foundation using anchor bolts to ensure stable operation and the absence of abnormal impact noises.

5. The heat exchanger shall be installed on a foundation, with the steam inlet end positioned higher than the drain end to ensure smooth condensate discharge.

6. When flange connections are made on steam pipelines, a high-temperature-resistant asbestos gasket or a PTFE gasket shall be installed in the joint; expansion bends or expansion joints shall also be provided to accommodate thermal expansion and contraction. For ductwork flange connections, an asbestos rope gasket or a rubber-asbestos gasket shall be used as the interfacial seal. All bolts for pipeline flange connections must be tightened securely to ensure there are no steam or air leaks.

7. Verify that the power supply voltage and frequency are 380 V (or 220 V) and 50 Hz, respectively. Once you have confirmed that the power supply is correct, connect it to the electrical control cabinet and all powered equipment.

8. Adjust the rotational speed of the screw feeder’s screw shaft to achieve the required feed rate under steady feeding conditions.

9. Adjust the excitation force of the vibration motor to regulate the bed amplitude, ensuring that the amplitude is matched to the material properties and the hot-air velocity so as to quickly bring the material to the fluidization state.

10. By adjusting the position of the bolt connection holes on the vibration motor base plate and the lower housing flange, the vibration direction angle can be changed, thereby regulating the drying time of the material within the vibratory fluidized-bed dryer and ensuring that the final moisture content of the product meets the specified requirements.

11. Adjust the steam valve of the heat exchanger to ensure that the steam supply matches the required hot-air temperature and airflow for the drying process.

12. While ensuring that the required drying heat is supplied, adjust the valves on the air inlet ducts of the fan and the vibrating fluidized-bed dryer so that, when no material is being fed, a slight positive pressure is maintained above the orifice plate, and, when material is being fed, a slight negative pressure is maintained above the orifice plate, thereby achieving uniform fluidization.

Usage and Operation

1. Before use, verify that the power supply voltage meets the specified requirements and ensure that there are no foreign objects inside any fans or screw feeders.

2. Start the induced-draft fan, the forced-draft fan, and the steam pipeline valves to generate hot air, thereby preheating the drying system. At the same time, inspect all connections for air leaks; if any are found, tighten them promptly. (When using other heat-source equipment, refer to its respective operating instructions.)

3. After the preheating requirements are met, start the induced draft fan and adjust the dampers at each air inlet to ensure that the drying system operates at its normal airflow and heat supply levels.

4. Start the vibration motor and observe whether the vibration of the lower housing and the machine bed is smooth. If any instability is detected, immediately shut down the vibration motor and identify the cause.

5. Start the electromagnetic speed-control motor and adjust the rotational speed of the screw feeder’s screw shaft. Begin feeding the raw material, continuously monitoring to ensure uniform and metered feed into the inlet of the vibratory fluidized-bed dryer (when using other feeding methods, strive for equally uniform feeding as well).

6. Start the reducer motor of the reverse-air bag filter and the reverse-air blower to initiate operation of the bag filter.

7. Observe whether the product discharge from the outlet of the vibrating fluidized-bed dryer is uniform, and periodically check the product’s moisture content and production rate.

8. Perform scheduled discharge from the cyclone separator and the reverse-air bag filter. When not discharging, open the upper valve on the discharge device and close the lower valve to allow material to flow directly into the hopper; during discharge, first close the upper valve and then open the lower valve to achieve air-locking while discharging. The discharge interval for the cyclone separator should be shorter, whereas the discharge interval for the reverse-air bag filter can be longer. (In practice, users can determine the optimal intervals through production trials.)

9. When ambient temperatures are low, regularly inspect the reverse-air bag filter for condensation. If condensation is observed, appropriately increase the humidity of the heated air and promptly remove any material that has adhered to the outer surface of the filter bags due to condensation, thereby ensuring unobstructed airflow through the bags.

10. When the drying system is to be shut down, first disconnect the power supply to the electromagnetic speed-control motor to stop the screw feeder from feeding material (and also cease any other feeding methods). Once no more material is discharged from the outlet of the vibratory fluidized-bed dryer, disconnect the power supply to the vibration motor to bring the dryer to a complete stop. Next, close the steam pipeline valve to halt the generation of hot air (if another heat source is used, refer to its respective operating manual) and allow the drying system to cool down gradually. After a short delay, turn off the power to the blower and other motors; at this point, the entire drying system will have been brought to a standstill.

11. This operating mode employs quantitative feeding, heat exchange in a heat exchanger, two-stage dust collection, and a non-cooling operation. Depending on the material, feeding may be performed manually or by other means, while hot air is supplied by a hot-air furnace or other heat-source equipment; the system can also operate with single-stage dust collection and a cooling section. Users are advised to refer to the corresponding instruction manual when using the equipment.

12. This instruction manual is prepared in accordance with standard operating procedures for reference by users. For specific materials, users should gradually accumulate experience during operation to determine the optimal process parameters, thereby ensuring that the entire equipment set operates at its best performance.

Maintenance and Care

1. Routine daily maintenance shall be performed, including adjusting the tension of the V-belt, lubricating with grease, and tightening screws on vibration-prone components, among other tasks.

2. Regularly clean the perforated plate bed of the vibrating fluidized-bed dryer to eliminate blocked holes and remove accumulated material. At the same time, open the bottom discharge port to clear any material that has leaked beneath the perforated plate.

3. Regularly inspect the filter bags for damage and loose connections, and remove any accumulated dust from the outer surface of the bags.

4. Inspect the flexible connection joints every two weeks for any signs of damage; if damage is found, replace them promptly.

5. Each bearing shall be cleaned and lubricated with fresh grease every three months.

6. Regularly inspect the discharge valves of the cyclone separator and the reverse-air bag filter for tightness; if any air leaks are detected, repair them promptly.

7. For the maintenance and servicing of electromagnetic speed-control motors, all fans, and gear reducers, please refer to the respective instruction manuals.

Common Faults and Troubleshooting Methods

Serial Number	Characteristics of the fault	Causes	Methods of elimination
1	Uneven feed	1. Bridging occurs inside the hopper. 2. The screw shaft speed is inappropriate.	1. Inspect the feeder blades 2. Adjust the screw shaft speed
2	Excessive vibration noise in the fluidized bed	1. The vibration motor generates significant noise. 2. Amplitude too large 3. Areas with loose connections 4. Vibration isolation spring damage	1. Select a vibration motor with low noise. 2. Appropriately reduce the amplitude 3. Tighten any loose parts 4. Replace the vibration isolation spring with a new one.
3	Material deviation	1. Lateral amplitude exists 2. The orifice plate is not horizontally level.	1. Adjust the eccentric blocks of the vibration motors on both sides. 2. Re-adjust the orifice plate’s level.
4	The product has a relatively high moisture content.	1. Excessive feed rate 2. Low hot-air temperature 3. Insufficient hot air flow	1. Reduce the feeder speed 2. Increase the hot-air temperature 3. Adjust to increase the airflow
5	The cyclone separator and the reverse-air bag filter discharge unit are not discharging material.	1. Valve leakage, air leakage 2. Material adhesion to the discharge device wall 3. Internal Material Accumulation	1. Adjust valve clearance 2. Gently tap the outer shell with a wooden stick to increase the number of discharging cycles. 3. Exclude
6	Product dust is discharged from the induced draft fan outlet.	1. Filter bag damage 2. The top connector of the filter bag is loose.	1. Replace the filter bag 2. Robust Interface