1 Equipment introduction:
Small closed spray dryer for pharmaceutical use. Explosion-proof grade. The device is specially designed for organic solvents. The inert gas medium formed by circulating nitrogen gas replaces the usual air medium for spray drying. In addition to recovering products, organic solvents can be recovered. The closed-circulation spray system is specially designed for the low flash point or slight toxicity of organic solvents and the flammable and explosive characteristics.
1.1 Explosion-proof system:
The first layer of nitrogen explosion-proof: According to the nature of the inert gas of nitrogen, the entire pipeline adopts nitrogen circulation, and the system can only operate normally when the oxygen content is below 3%.
The second layer of industrial control is explosion-proof, the pressure is higher than 3000pa, the safety valve is opened, and the pressure can be relieved. Please consult the factory technical engineer for the detailed industrial control process.
The third layer of explosion-proof disc is explosion-proof. When the pressure in the drying tower system increases abnormally, the explosion-proof disc on the top of the tower will automatically open to vent the explosion
The fourth layer is explosion-proof, with internal ventilation system (optional), suitable for harmful gases.
1.2 Product features:
Can prevent oxidation, avoid danger and improve quality;
It is easy to realize aseptic and dust-free.
It can recover the solvent in the feed liquid.
Improve the preservation of aromatic ingredients.
It can dry or cool and granulate combustible materials.
It can dry materials with very high heat sensitivity.
It can achieve low pollution and no pollution.
Can save the deodorizing device.
Can perform low temperature drying below 100°C.
1.3 Applicable products:
Non-oxidizing ceramics, super hard alloys, high-efficiency battery materials. Seasoning, healthy food. Pharmaceuticals, vitamins, organic medicines. Synthetic resin, wax, etc.
2 Overall structure (subject to Qiao Feng's final design)
The equipment is mainly composed of: feeding system, heating system, atomization system, spray drying system, inert gas circulation system, product recovery system, and condensation system.
2.1 Feeding system
Including: batching tank, solvent tank, feed peristaltic pump, conveying pipeline, atomizer, first put the configured slurry into the batching tank, after stirring evenly, driven by the peristaltic pump, the slurry reaches through the pipeline valve The atomizer, the atomizer needs to be equipped with a special explosion-proof atomizer nozzle made by Shanghai Qiaofeng, and the nozzle life is guaranteed for one year.
2.2 Heating system
The heating system is composed of a nitrogen-electric heating system. The closed heating element directly heats the drying medium (nitrogen) in the pipeline and passes through a set of pressure regulating control devices to control the temperature accuracy within ±2℃
2.3 Drying tower
The drying tower includes: tower body, explosion-proof lighting, gas distributor, temperature control equipment, pressure relief device, air inlet pipeline, air outlet pipeline, oxygen content measurement sensor and other components, and a filter device is required inside the air inlet pipeline; After the atomized slurry is heated by the hot air, the slurry is completely volatilized and dried into a discharge port where the powder falls to the bottom, and the gas is discharged from the exhaust pipe to carry out a closed loop pipeline.
2.4 Product recovery system
The gas discharged from the bottom of the drying tower contains powder and organic solvent vapor, and it is recovered by a filter device, the powder and organic solvent gas are separated, the powder is recovered, and the organic gas enters the condenser for recovery and reuse.
2.5 Gas circulation system
The gas circulation is completed by a set of circulating fans. The drying medium is output from the circulating fan, flows through the condensing device, electric heater, drying tower, cyclone separator or bag filter, temperature-resistant high-efficiency filter, and then returns to the circulating fan for repeated use. Form a gas circulation system.
2.6 Condensation system
The condensing system consists of a refrigeration unit, condenser, refrigerant circulating pump, filter, heat exchanger and connecting pipelines. The "wet" gas discharged from the dust collector (including the evaporated organic solvent vapor) enters the condenser. The gas is cooled and deliquored by the condenser and then returned to the gas circulation system. The organic solvent vapor is condensed and recovered and then passed through the liquid level control at the bottom of the condenser The device is automatically discharged into the solvent tank.
2.7 Atomization system
This system adopts the hard contact of the mechanical structure, without any gasket, and no leakage. Different from ordinary electric centrifugal nozzles, the overheated corrosive steam contacts the wires of the electric nozzles for a long time, thereby corroding the wires, causing the plastic coating on the wire surface to corrode and soften, thus forming a short circuit.
3. Advantages of this equipment:
3.1 Adopt Qiao Feng's innovative (QFN-BLG-ES-VER2018-1A) atomization system, this system adopts the hard contact of the mechanical structure, without any gasket, and no leakage. Different from ordinary electric centrifugal nozzles, the overheated corrosive steam will contact the electric wires of the electric nozzles for a long time under positive pressure, thereby corroding the wires, causing the plastic coating on the wire surface to corrode and soften, thus forming a short circuit.
3.2 It can realize ultra-fine powder in the range of 1-8 microns, suitable for the preparation of battery materials
