Closed Cycle Spray Dryer: For Inflammable & Explosive Powders

Inflammable And Explosive Powder Closed Cycle Spray Dryer ,

Closed Cycle Spray Dryer ,

Description

      This plant works in a closed environment, which needs to be dried in an inert gas atmosphere, generally filled with nitrogen. The closed circulation spray drying system is mainly used for products containing alcohol and flammable and explosive solvents in the slurry, or products which are easily oxidized and cannot be exposed in the air. By filling inert gas such as nitrogen, it can prevent the product from contact with air. The product produced by this plant has good consistency and good fluidity, and can produce spherical materials.

Definition of closed-cycle spray drying

      Closed cycle spray dryer in the drying chamber will be sealed into the mist droplets dispersed solid to liquid and hot medium (nitrogen N2) was dried droplet method of powder products. Atomized by rotary atomizer or a nozzle atomizer to achieve, droplet drying can be adjusted by the temperature or the flow of heat medium to be controlled, evaporation of the solvent to be recovered through the condensation unit, after "removal" and full " dewetting "of the media were highly efficient filters and returned to heat exchanger, and finally recycled into the drying system.

      The success of closed cycle spray drying washing and cooling operation requirements will be part of an accurate temperature control. For high boiling point of alcohol generally cooling water or salt water, low boiling point solvents such as dichloromethane, hexane, acetone and the like, you must use compression refrigeration system heat exchange.

      Spray drying has developed into the most successful technology for powder drying in the pharmaceutical, food, chemical, and metallurgical industries since the development of drying technology for skimmed milk in Europe in the early 20th century. Especially in recent years, spray drying is a drying form that directly forms liquid slurry into powdery materials and is most widely used in other industries. Spray drying is a drying process in which the raw material liquid is dispersed into droplets with an atomizer, and hot air (or other gas) is directly contacted with the droplets for heat transfer and mass transfer heat exchange to obtain a powdery granular product. The raw material liquid can be a solution, an emulsion or a suspension, or a molten liquid or a paste. The dried product can be made into powder, granule, hollow sphere or pellet form as required. From the perspective of the classification of spray dryers: according to the direction of air flow, there are parallel flow (cocurrent), counter flow and mixed flow; according to the form of atomizer, there are centrifugal, pressure, and air flow; According to the production process, there are mainly two types of open and closed cycles (In subdivision, there are also two types of self-idling cycle and semi-closed cycle).

Explosion-proof closed cycle centrifugal spray dryer system work instructions

      Firstly, the heated nitrogen is filled into the drying tower. The dried liquid material is transported to the centrifugal nozzle by the infusion pump. The liquid material is atomized into fine droplets by the high-speed rotating centrifugal atomizer. The droplets are heated in the drying tower. Nitrogen conducts sufficient heat exchange, the liquid part of the material is instantly evaporated, the powdery material formed by the solid part sinks to the bottom of the tower, and finally the dry powdery material is discharged from the bottom of the tower. Among them, the evaporated organic solvent gas is subjected to a cyclone separator, spray tower and other devices to remove the dust attached to the gas under the action of a fan, and then the saturated organic solvent gas after the dust removal is condensed into a liquid through a condenser. Condenser. In the meantime, the non-condensable inert gas as the drying medium is continuously heated and then recycled as a drying carrier in the system. Conventional ordinary centrifugal spray drying achieves the purpose of dehumidification through continuous air supply and exhaust. This is also an obvious difference between explosion-proof closed centrifugal spray drying equipment and ordinary centrifugal spray drying equipment.

      The explosion-proof closed cycle centrifugal spray drying system works in a closed environment. The drying medium is an inert gas such as nitrogen. The drying tower is operated under positive pressure. If the internal pressure drops, the pressure transmitter can automatically control the nitrogen entering To ensure the system pressure balance. Because nitrogen is used as the circulating carrier, it has a protective effect on the dried materials. The circulating carrier such as nitrogen plays the role of moisture-carrying, dehumidifying and circulating transmission, and the carrier medium can be reused. However, conventional ordinary centrifugal spray drying achieves the purpose of dehumidification through continuous air supply and exhaust, and the control in the tower is negative pressure operation. This is also the explosion-proof closed centrifugal spray drying system and the ordinary centrifugal spray drying system. Obvious difference. Therefore, the explosion-proof closed cycle centrifugal spray drying system is especially suitable for drying organic solvent materials, toxic materials, and materials that are prone to oxidation during the drying process.

 
  Products Parameters   

Notes:

⒈The equipment of the above specifications is suitable for the research and development and spray granulation for a small amount of products, small batch production or large-scale production and etc.;

⒉The evaporation of ethanol is based on the hot air inlet temperature of 140 ℃ and outlet temperature of 70 ℃.

主要流程图 Drying flow chat

 
  Details Image