吉安Nitrogen closed circuit spray dryer

The nitrogen closed-circuit spray dryer consists of a centrifugal spray dryer main machine, a heater with an air filter, a blower, a gas-liquid separator, a large and small condenser, a spray tower, an exhaust fan, a primary cyclone separator, a secondary cyclone separator, a pump, an oxygen detector, pipelines and control valves, etc. As a special equipment for drying organic solvent slurry, the nitrogen closed-circuit spray dryer is dried by nitrogen..

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吉安Closed circuit dryer series

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Product overview

Equipment Overview

The nitrogen closed-circuit spray dryer is composed of a centrifugal spray dryer host, a heater with an air filter, a blower, a gas-liquid separator, a large and small condenser, a spray tower, an exhaust fan, a primary cyclone separator, a secondary cyclone separator, a pump, an oxygen detector, a pipeline and a control valve.

As a special equipment for drying organic solvent slurry, helium closed-circuit circulation spray dryer uses xenon gas as the drying circulation gas. The materials in the drying process can prevent oxidation and recover organic solvents at the same time. It is suitable for powder drying of slurry prepared by organic solvents such as ethanol, acetone and hexane. The equipment adopts explosion-proof design and the drying process is safe and environmentally friendly.

Working principle

The nitrogen closed-circuit circulation spray dryer works in a closed environment. The drying medium is inert gas, generally nitrogen. It is suitable for drying materials with organic solvent to dry materials with toxic gas or materials prone to oxidation during drying. Nitrogen enters the drying tower after being heated by a heater. The wave body materials are transported to the centrifugal nozzle through a screw pump. The liquid is atomized into droplets by a high-speed rotating centrifugal atomizer to complete the heat and mass exchange process in the drying tower, the dried powdery material is discharged from the bottom of the tower. Under the action of the fan, the evaporated organic solvent gas passes through the cyclone separator and the spray tower to remove dust. After the saturated organic solvent gas is condensed into liquid by the condenser and discharged from the condenser. The non-condensable gas medium is continuously heated and reused as a drying carrier in the system. The regular ordinary centrifugal spray drying is through the continuous air supply, exhaust to achieve the purpose of dehumidifying, which is also a clear difference between the explosion-proof closed centrifugal spray drying equipment and ordinary centrifugal spray drying equipment. Among them, the drying medium in the drying system is nitrogen, and the internal is operated by positive pressure to maintain a certain positive pressure value. If the internal pressure drops, the pressure transmitter will automatically control the nitrogen intake to ensure the pressure balance of the system. Due to the use of inert gas such as nitrogen as the circulating gas, the dry material has a protective effect, the circulating gas undergoes the process of carrying moisture and dehumidification, and the medium can be reused.

advantage embodiment

The connection of each pipeline in the closed system adopts a unique sealing structure, which has good tightness, which can ensure that the system has no leakage under the pressure of 0.5MPa and has high thermal efficiency.

The inert ammonia gas is used as the drying medium gas, which is anti-toxic, anti-oxidation and anti-explosion. The gas can be reused after carrying moisture and dewetting.

The condensation system and recovery system equipped with the solvent of the drying feed liquid in the system can make the solvent in the drying feed liquid be recycled through secondary treatment. The material can be dried (solvent removal) in the closed state and ammonia environment in the hot state and the solvent can be recovered through the condenser. The safety of the whole machine is high. At the same time, the equipment is fully closed and the material recovery rate is high, the high yield of this equipment system is beyond the reach of other types of dryers. Main technical indicators: dry powder material recovery rate> 95%, product residual solvent ≤ 2%, thus greatly reducing the production cost.

The drying speed is rapid. After the feed liquid is sprayed, the surface area increases. In the high-temperature air flow, 95% and 98% of the water can be evaporated instantly, and the drying time is generally only about 5-40see.

Spray drying is usually used to treat solutions with moisture content of 40% and 60%. It can be dried into powdery products at one time. Most products do not need to be crushed and screened after drying, thus reducing the production process and simplifying the production process. At the same time, the products have good dispersibility, fluidity and solubility. Since the drying process is completed in air, the products can maintain spherical shape similar to liquid droplets, with good liquidity;.

The equipment has system pressure on-line test device, oxygen concentration on-line detection control device and in-place cleaning device.

The equipment control system adopts man-machine interface, that is, PLC touch screen control, process flow chart dynamic display. The particle size, bulk density and moisture of the product are within a certain range, which can be adjusted by changing the operating conditions, and the control is more convenient.

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