ZLG Vibrating Fluid Bed Dryer company, supplier | Longxin (Changzhou) Smart Equipments CO.,Ltd.

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Introduction

The vibrating fluidized bed dryer applies mechanical vibration to a conventional fluidized bed dryer. By adjusting vibration parameters, ordinary fluidized beds with severe back‑mixing can achieve an ideal plug flow state during continuous operation. Meanwhile, the introduction of vibration greatly improves common drawbacks of traditional fluidized bed dryers, such as uneven moisture content of dried particles, as well as agglomeration and caking when material moisture is relatively high.

The vibrating fluidized bed is an upgraded hot air convection drying device. During operation, excitation force generated by vibration motors or other driving methods makes materials jump and advance on the air distribution plate. Meanwhile, materials come into contact with hot air supplied from beneath the plate to complete heat and mass transfer. The lower box forms a stable pressure air plenum for the material bed. By adjusting the induced draft fan, a slight negative pressure is maintained above the material bed inside the upper chamber, ensuring a superior drying environment and preventing dust leakage. The air distribution plate supports the material layer and realizes uniform hot air distribution.

The ZLG series linear vibrating fluidized bed dryer is a new type of drying and cooling equipment developed by our factory. It integrates imported advanced technologies and more than ten years of practical drying experience, and has been widely applied across various industries.

Beyond high-efficiency drying performance, the vibrating fluidized bed can also fulfill granulation, cooling, micro-liquid spraying, screening and conveying processes according to production requirements.

Working Principle

Vibrating Fluidized Bed Dryer

The vibrating fluidized bed dryer adds mechanical vibration to the material fluidization process. The material is tossed and loosened under vibration, which is organically combined with airflow fluidization to achieve stable and low-resistance bed fluidization.

Different from traditional fluidized bed dryers, in which material conveying and fluidization rely entirely on hot air flow, the vibrating fluidized bed mainly depends on mechanical vibration for material transportation. This design reduces the minimum fluidization velocity. Particles near the bottom of the material layer are fluidized first, improving the overall fluidization quality on the air distribution plate. It enables stable drying of materials that are difficult to fluidize conventionally.

The specific working process is as follows:

Hot Air Intake

Hot air is delivered to the equipment bottom by a fan and evenly distributed to the entire material bed through the air distribution plate.
Fluidization

When the hot air velocity reaches a certain value, particulate materials are lifted and collide with one another to form a uniform fluidized state.
Vibration Assistance

In addition to hot air action, the material bed is subject to mechanical vibration (horizontal or vertical). Vibration improves material flowability, prevents particle adhesion and agglomeration, and controls material residence time to ensure uniform drying.
Drying Process

Under fluidized conditions, materials make full contact with hot air. Internal moisture evaporates rapidly and is discharged along with the exhaust airflow.
Material Discharge

After sufficient drying, finished materials are discharged from the outlet for collection, further processing or packaging.

Performance Characteristics

Vibrating Fluidized Bed Dryer

Compared with traditional fixed-bed dryers, the vibrating fluidized bed dryer excels in handling materials that tend to cake or adhere. It delivers higher drying efficiency and more uniform product quality. Meanwhile, parameters such as vibration frequency, hot air temperature and air volume can be adjusted flexibly to meet the drying requirements of various materials.

(1) Mechanical vibration reduces the minimum fluidization air velocity, which significantly cuts air consumption and lowers dust entrainment. The supporting heat source, fan, cyclone separator and other auxiliary equipment can adopt smaller specifications, greatly reducing overall equipment investment with remarkable energy-saving benefits.

(2) The material residence time inside the dryer can be easily adjusted by modifying vibration parameters. The plug-flow operation lowers requirements on particle size uniformity and regularity, ensuring consistently dried finished products.

(3) Vibration promotes material dispersion. With optimized vibration settings, materials prone to agglomeration or channeling in ordinary fluidized beds can achieve stable fluidized drying.

(4) Without severe back-mixing, the airflow velocity is lower than that of conventional fluidized beds, causing minimal damage to particles. It is highly suitable for materials requiring complete crystal form retention or fine surface gloss after drying.

(5) Mechanical vibration will generate certain operating noise, and the service life of individual wearing parts is shorter than that of other types of dryers.

Applicable Materials

Vibrating Fluidized Bed Dryer

The vibrating fluidized bed dryer is suitable for a wide range of materials, especially granular and powdery materials that can form a stable fluidized state.

(1) Chemical Products: catalysts, resins, polymer particles, etc.

(2) Pharmaceutical Industry: pharmaceutical granules, vitamin particles and other medicinal materials.

(3) Food Industry: seasonings, food additives, grains, sugars and related products.

(4) Agricultural Fertilizers: compound fertilizers, trace element fertilizers, etc.

(5) Mineral Processing: mineral powder, metal oxides and other mineral materials.

(6) Plastic Industry: plastic pellets, color masterbatch pellets, and more.

Equipment Improvements

Vibrating Fluidized Bed Dryer

Based on extensive user feedback and practical operating experience, we have carried out targeted structural upgrades on the conventional vibrating fluidized bed. Minor optimizations are not elaborated herein. The major improvements are as follows:

(1) Adopting a sectional air intake design, the dryer is divided into a pre-drying section, intensive drying section and cooling section.

(2) The upper and lower bed shells adopt a quick-assembly structure, enabling fast and thorough cleaning of all key components of the main unit.

(3) The traditional baffled air inlet is replaced with bottom-up air supply, ensuring uniform and reasonable airflow distribution across the entire bed surface. This guarantees even heating and consistent drying quality with lower system resistance.

(4) The enlarged box-type upper chamber reduces scattered exhaust pipelines. Centralized exhaust simplifies cleaning points and further improves overall drying performance.

(5) According to material drying characteristics, tongue-type perforated plates are used for the fluidized bed deck. It features consistent airflow direction, low pressure drop, uniform and steady material conveying speed, and zero material leakage.

(6) Integrated combined design of drying and cooling sections achieves high output and flexible adjustability. The cooling system can be equipped with a refrigeration and dehumidification unit to realize forced cooling and dehumidification of inlet air, ensuring ideal cooling effect and effectively preventing moisture reabsorption.

ZLG Vibrating Fluid Bed Dryer

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