EN
FG Closed-loop Fluid Bed Dryer
FG Closed-loop Fluid Bed Dryer
description1
Zipper closure
1/5 zip athletic pullovers for men. Stretchy, lightweight, fast-drying
fabric for superior performance.
REGULAR FIT - US standard sizes. An athletic fit that sits close to the
body
for a wide range of motion, designed for optimal performance and all day
comfort.
FEATURES - Quarter zip closure;Thumbholes on long sleeves to keep them
in
place during workout
Product Details
Nitrogen-Sealed Closed-Circuit Fluidized Bed Dryer
The nitrogen-sealed closed-circuit fluidized bed dryer is a drying equipment specifically designed for materials that are oxygen-sensitive, prone to oxidation, or flammable and explosive. It uses nitrogen as the drying medium and operates in a fully enclosed system, ensuring that materials do not come into contact with oxygen in the air during drying, thus preventing oxidation reactions or explosions, and enabling solvent recovery. Due to its unique working principle, the closed-circuit fluidized bed dryer is widely used in industries such as chemical, pharmaceutical, and food. By controlling the drying environment, it not only improves drying efficiency but also guarantees the quality of dried products.
The closed-circuit fluidized bed dryer mainly consists of a drying host, a gas-solid separator, a surface cooler, a circulating fan, a heater, and other components. It is primarily used for drying materials that release solvents, require anaerobic conditions, or emit toxic/odorous gases. Existing drying systems are not closed-circuit, resulting in the discharge of wastewater and waste gas, solvent release, and environmental pollution. Additionally, the cyclic feeding mechanism causes mixing of wet materials, leading to inconsistent final moisture content of dried materials. Moreover, over-temperature and over-oxygen conditions during operation risk spontaneous combustion of solvents inside the equipment. To address these issues, Longxin Drying has developed a new closed-circuit fluidized bed drying system (Patent No.: ZL 2020 2 1689649.6). This equipment operates in a fully sealed manner with internal inert gas protection, effectively isolating air. It features explosion-proof, odor-proof, and solvent gas leakage prevention capabilities. The closed recovery of solvent gas not only protects the environment with no wastewater or waste gas emissions but also delivers significant economic benefits through solvent recycling and reuse.
Working Principle of MFG Closed Fluidized Bed Dryer
The nitrogen-sealed fluidized bed drying system consists of dryer, feeding unit, discharging unit, closed circulation unit and solvent recovery unit. Hot water tracing pipes are installed on the outer shell of the dryer to maintain stable cylinder temperature and prevent solvent condensation caused by ambient temperature fluctuation. An on-line sampler is fitted on the hopper to test and verify whether the final material moisture content meets standards during commissioning.
An internal bag filter is equipped inside the dryer, adopting high-pressure pulse off-line ash cleaning. It ensures dust-free exhausted gas with dust collection efficiency exceeding 99.5%, effectively protecting surface coolers and heaters. Intermittent automatic feeding and discharging mode is applied, which precisely controls final moisture of low-temperature and low-moisture materials, eliminates back-mixing of wet materials and secures uniform final moisture content.
The closed circulation unit enables fully sealed operation with internal inert gas filling to isolate air, delivering excellent performance of explosion resistance, odor suppression and solvent leakage prevention. Closed solvent recovery achieves zero discharge of wastewater and waste gas for environmental protection, and brings considerable economic benefits via solvent reuse.
The closed circulation unit comprises primary bag filter, condenser, circulating fan, filter and heater. The dryer is pipeline-connected with the primary bag filter. Wet waste gas and residual dust generated from material drying flow into the primary bag filter for dust removal. A differential pressure sensor inside the filter monitors pressure difference of filter bags. Pulse cleaning valves activate only when pressure reaches preset threshold, lowering pulse frequency and nitrogen external emission.
Dust-free waste gas flows into the condenser for condensation, where baffles separate condensed solvent from nitrogen. Recovered solvent is conveyed to the collection unit. Chilled brine serves as cooling medium of the condenser. A humidity sensor mounted on the pipeline between condenser and circulating fan detects nitrogen humidity. Unqualified nitrogen will be reintroduced into the condenser for secondary dehumidification. Low-moisture dry nitrogen accelerates drying efficiency by replacing internal moisture, avoiding unstable final moisture affected by external weather conditions.
Sealed circulating fan delivers nitrogen to the filter for deep dust purification to guarantee circulating gas purity. Purified nitrogen is heated by the heater and sent back to the dryer to displace moisture from wet materials, forming an enclosed circulating drying loop.
Process Flow Diagram of MFG Closed Fluidized Bed Dryer
Key Features of MFG Closed Fluidized Bed Dryer
The nitrogen-sealed fluidized bed dryer is widely applied in pharmaceutical, chemical, food processing and other industries, especially for drying processes requiring sterile, oxygen-free or explosion-proof conditions. In pharmaceutical production, it minimizes loss of volatile organic solvents during drying of medicinal ingredients and safeguards operational safety.
- Fully Closed Circulation: Isolates materials from ambient air and enhances drying safety.
- Zero Emission: Barely generates waste gas during operation, eco-friendly.
- Solvent Recovery: Achieves high-efficiency solvent recycling, cutting costs and environmental pollution.
- High Automation: Equipped with automatic control system to monitor and adjust temperature, oxygen content, system pressure and other parameters for stable and safe operation.
- Energy Saving & Environmental Protection: Reuses inert gas to lower energy consumption.
- Superior Product Quality: Avoids oxygen contact and maintains chemical stability of materials.
- Compliant with Safety Standards: Reduces fire and explosion hazards when handling flammable substances.
- Wide Applicability: Suitable for drying various materials under specific atmospheric conditions.
Technical Upgrades of Nitrogen Circulation Fluidized Bed Dryer
- PLC touch screen control ensures convenient and stable operation. Strict interlock function prevents manual misoperation.
- Off-line pulse bag ash cleaning delivers better dedusting performance than on-line pulse cleaning and cylinder shaking cleaning, avoiding material dead bed.
- Top-mounted rigid framework bags facilitate easy disassembly and cleaning without entering the cylinder, improving working conditions.
- Automatic negative pressure feeding driven by built-in induced draft fan reduces manual workload.
- Automatic sealed discharging avoids cross contamination and lessens labor intensity.
- Built-in stirring structure prevents material bridging and dead bed, optimizing fluidized drying effect.
- Seamless circular structure with no dead corners enables quick cleaning and zero cross contamination, complying with GMP standards.
- Optional fully automatic unattended continuous operation when connected with pneumatic conveying system.
- Drain device installed at machine base rapidly discharges residual cleaning water.
- Easy operation, disassembly and cleaning, fully meeting GMP requirements.
- Excellent overall tightness and negative pressure operation conform to GMP specifications.
- Dual anti-static shaking bag filter, or stainless steel back-blow filter for special demands. Rubber expansion sealing ring and compressed air detection ensure tight sealing. Dust sensor on exhaust pipeline interlocks with PLC system to guarantee product safety.
- Optional 2Bar or 10Bar explosion-resistant design with reliable grounding to protect personnel, equipment and surroundings.
- Optional lifting turnover discharging or vacuum discharging inline dry granulating unit realizes dust-free discharging, satisfying dust-free production norms of GMP.
Related Products
.jpg?x-oss-process=image/resize,w_100/quality,q_100)
.jpg?x-oss-process=image/resize,w_100/quality,q_100)
CONTACT US
Contact US
Product Information
Quantity
Unit
Piece
Support order samples, customization, wholesale direct, and complete payment. If the product you look for does not have corresponding customized content, pls fill out the form below to contact us, and we will reply ASAP.