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BLPG Closed-cycle Spray Dryer
BLPG Closed-cycle Spray Dryer
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Zipper closure
1/5 zip athletic pullovers for men. Stretchy, lightweight, fast-drying
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FEATURES - Quarter zip closure;Thumbholes on long sleeves to keep them
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Product Details
Closed-cycle Spray Dryer
It is applicable to drying solutions, emulsions, suspensions and pastes containing organic solvents, volatile toxic and harmful substances and oxidizable materials requiring solvent recovery. It retains all merits of conventional spray dryers. No powder leakage occurs during operation, achieving nearly 100% product recovery rate. Recovered solvent can be recycled after reprocessing to cut production costs significantly.
It is widely used for drying and granulating pharmaceutical products with organic solvents, Chinese herbal extracts and biological materials, as well as solvent recovery of petroleum catalysts, silicon carbide, fine chemicals and polymer materials.
Jiangsu Longxin closed-cycle spray dryer resolves difficulties in organic solvent recycling and drying of oxidizable & toxic materials. It boosts material recovery and realizes safe, environmentally friendly and energy-saving production with superior technical performance and process design.
Working Principle
The closed-cycle inert gas spray drying unit consists of nitrogen circulation system, spray dryer, gas-solid separator, nitrogen back-blow dust remover, condensing solvent recovery device and heating system.
Heated nitrogen fills the drying tower. Liquid materials are pumped to the centrifugal atomizer and dispersed into fine droplets. Full heat exchange takes place between droplets and hot nitrogen inside the tower. Liquid components evaporate instantly, while solid powder settles at the tower bottom and is discharged finally.
Volatilized organic solvent vapor carries residual dust and undergoes purification via cyclone separator and bag filter. Clean vapor is condensed into liquid by condenser, followed by gas-liquid separation to avoid liquid entrainment. Purified inert gas is reheated and circulated repeatedly as drying medium.
The explosion-proof closed-cycle system operates in sealed condition with inert gas such as nitrogen. Positive pressure is maintained inside the tower. Pressure transmitters automatically adjust nitrogen intake to stabilize system pressure.
Technical Comparison: Open-type vs Closed-cycle Spray Dryer
- The closed-cycle system consumes less heating medium and features high energy efficiency.
- It handles flammable, explosive, oxidizable and toxic materials with organic solvents, which cannot be processed by open-type equipment, ensuring high operational safety.
- Equipped with dedicated solvent recovery unit, it delivers excellent environmental performance.
- Negative pressure is maintained inside open drying towers, while closed-cycle towers work under positive pressure.
Performance Characteristics of Closed-cycle Spray Dryer
- Unique sealing structure for pipeline connection ensures tightness with no leakage under 10kPa positive pressure and high thermal efficiency.
- Inert nitrogen serves as drying medium to prevent poisoning, oxidation and explosion. The gas can be recycled after moisture absorption and removal.
- Built-in condensation and recovery system reprocesses and recycles organic solvents. Drying and solvent removal proceed under sealed nitrogen atmosphere with high safety. Full enclosed design achieves superior material recovery rate over other dryers. Dry powder recovery rate ≥95%, residual solvent ≤2%, effectively cutting production cost.
- Fast drying speed. Atomized material expands surface area, evaporating 95%~98% moisture within 5~40 seconds.
- Processes solutions with 40%~60% moisture and produces powder in one pass. No extra crushing and screening required to simplify procedures. Finished products feature favorable dispersibility, fluidity and solubility with regular spherical shape.
- Equipped with on-line pressure monitoring, oxygen concentration detection and CIP cleaning devices.
- PLC and touch screen control with dynamic process display. Particle size, bulk density and moisture content are adjustable via operating parameters for convenient management.
Application Conditions
Suitable for drying solutions, emulsions, suspensions and pastes containing organic solvents, volatile toxic substances and light-sensitive oxidizable materials with solvent recovery demands. Zero powder leakage realizes nearly 100% yield. Recycled solvents can be reused to reduce costs.
Explosion-proof closed-cycle centrifugal spray dryer applies to scenarios below:
- Solvent recovery required for organic solvent-based wet materials
- Flammable and explosive risks when solvent contacts air
- Materials prone to oxidation under oxygen exposure
- Sterile drying environment required to avoid bacterial contamination
- Avoid environmental pollution caused by peculiar smell and toxic emissions
BLPG Closed-cycle Spray Dryer Process Flow Chart 1 - Standard Type
Process Flow Chart 2 of BLPG Closed-cycle Spray Dryer — With Waste Heat Recovery Unit
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