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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
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
Introduction
The closed-loop spray dryer is applicable to the drying of solutions, emulsions, suspensions and pastes that contain organic solvents, volatile toxic and harmful gases, or easily oxidized components and require solvent recovery. It inherits all the advantages of conventional spray dryers. Meanwhile, the system allows no powder leakage during operation, achieving nearly 100% product yield.
Solvents recovered by the recycling system can be reused after secondary treatment, which greatly reduces production costs. It is especially suitable for the drying and granulation of pharmaceutical products containing organic solvents, traditional Chinese medicine extracts and biological solvent materials in the pharmaceutical industry. It also supports solvent recovery and drying processes for fine chemicals and polymer materials such as petroleum catalysts and silicon carbide.
Jiangsu Longxin’s closed-loop spray dryer effectively solves the technical difficulties in drying easily oxidized and toxic materials as well as organic solvent recycling. It improves material recovery efficiency and delivers outstanding effects in safety, environmental protection and energy conservation, with remarkable advantages in comprehensive technical performance and process design.
Working Principle of Closed‑Loop Spray Dryer
The closed‑loop inert gas spray drying system consists of core units including a nitrogen closed circulation system, spray dryer, solid‑gas separation device, nitrogen back‑blowing dust removal unit, condensation cooling solvent recovery system and heating system.
First, the drying tower is filled with heated nitrogen. Liquid raw materials are delivered by a feed pump to the centrifugal atomizer and dispersed into fine droplets. Inside the tower, the droplets conduct sufficient heat exchange with hot nitrogen; the liquid components evaporate instantly, while solid components form powder and settle at the tower bottom before final discharge.
Evaporated organic solvent vapor is driven by the fan to pass through cyclone separators, bag filters and other dust removal equipment to remove fine powder. The purified saturated solvent gas is then condensed into liquid via a condenser. A gas–liquid separator is installed at the rear to prevent liquid entrainment. Meanwhile, the inert drying gas is reheated continuously and recycled inside the system as the drying medium.
The explosion‑proof closed‑loop centrifugal spray drying system operates in a fully sealed environment with inert gas such as nitrogen as the drying medium. The drying tower runs under positive pressure. Once the internal pressure drops, a pressure transmitter automatically adjusts the nitrogen intake to maintain system pressure balance.
Technical Comparison: Open vs. Closed‑Loop Spray Drying System
- The closed‑loop system consumes far less drying medium than open systems and features superior energy‑saving performance.
- It is suitable for materials containing organic solvents, as well as easily oxidized, flammable, explosive and toxic substances — application scenarios unavailable for open systems, ensuring high operational safety.
- Equipped with a complete organic solvent recovery unit, the closed‑loop design delivers outstanding environmental benefits.
- Open drying towers operate under negative pressure, while closed‑loop systems maintain stable positive pressure inside the tower.
Performance Characteristics of Closed-Loop Spray Dryer
(1) All pipeline connections of the closed system adopt a unique sealing structure with excellent tightness, ensuring zero leakage under a positive pressure of 10 kPa and high thermal efficiency.
(2) Inert nitrogen is used as the drying medium to realize protection against toxicity, oxidation and explosion. The gas can be recycled repeatedly after moisture absorption and dehumidification.
(3) The system is equipped with a condensation and recovery unit for organic solvents. The separated solvents can be recycled after secondary treatment. Material drying and solvent removal are completed under high temperature in a fully sealed nitrogen atmosphere, with solvents recovered by the condenser for high overall safety.
Featuring an entirely enclosed structure, the equipment achieves an ultra-high material recovery rate unmatched by other dryers.
Key technical indicators: dry powder recovery rate ≥ 95%, residual solvent in finished products ≤ 2%, effectively reducing production costs.
(4) Extremely fast drying speed. After atomization, the material liquid boasts a greatly increased specific surface area. In high-temperature airflow, 95%–98% of moisture evaporates instantly, with the whole drying process completed in only 5–40 seconds.
(5) It is commonly used for solutions with a moisture content of 40%–60%, enabling one-step drying into powdered products. Most materials require no further crushing or screening after drying, which simplifies working procedures and production workflows.
Finished products present good dispersibility, fluidity and solubility. Dried particles remain nearly spherical, similar to the original droplets, ensuring excellent flow performance.
(6) The machine is equipped with online system pressure monitoring, online oxygen concentration detection & control, and CIP cleaning devices.
(7) The control system adopts a human-machine interface with PLC and touchscreen operation, displaying dynamic process flow diagrams.
Product indicators such as particle size, bulk density and moisture content can be adjusted flexibly by modifying operating parameters for convenient process control.
Application Conditions of Closed-Loop Spray Dryer
The closed-loop centrifugal spray dryer is suitable for drying solutions, emulsions, suspensions and pastes that contain organic solvents, volatile toxic and harmful substances, as well as light‑sensitive and easily oxidized materials requiring solvent recovery. It retains all the advantages of conventional centrifugal spray dryers. The fully enclosed system prevents any powder leakage during operation, achieving an almost 100% product yield. Recovered solvents can be recycled after secondary treatment, greatly cutting production costs.
The explosion‑proof closed-loop centrifugal spray dryer meets the spray drying requirements for the following working conditions:
- The moisture component of the material is an organic solvent that needs to be recycled;
- The solvent contained in solids poses a flammable or explosive risk when exposed to air;
- Solid materials are susceptible to oxidation upon contact with oxygen during drying;
- Prevention of bacterial contamination throughout the drying process is required;
- The exhaust gas contains odorous or toxic components that may cause environmental pollution after discharge.
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