Vacuum dryer vacuum drying process is a complex, time-varying, nonlinear industrial processes, drying control is to adjust and control the process parameters affect the entire drying process.
In many chemical and pharmaceutical products (intermediate or final product), the synthesis process, the solid particles are suspended in the liquid, at a certain stage of its separated from the slurry. First, using a mechanical solid-liquid separation equipment, centrifuges, vacuum (or pressure), the filtering machine, settler vessel, filter and static thickener such as filtration, the solid was separated from the liquid. For a process to select the best type of mechanical separation equipment, vacuum dryer vacuum drying is mainly based on the solid nature of production capacity and mode of operation, and other factors to decide. But usually only by a mechanical solid-liquid separation step is the product quality requirements can not be reached, because only rely on the mechanical force is impossible to remove all of the liquid. Discharged from the centrifuge or filter product moisture is generally in the range of 5% to 80% (by weight), depending on the products and equipment. Therefore, after the completion of the mechanical solid-liquid separation, it is generally also need to heat the solid-liquid separation step, the liquid remaining in the solid separated. This step is often referred to as "dry".
Product drying effect change is an important driving force in the evaporation temperature of the liquid contained in the vacuum dryer vacuum drying temperature depends on the process pressure. The evaporation temperature dropped lower process pressure, can bring many benefits, especially for contact drying. Not necessary to design the ideal for which only in the minimum pressure and the maximum permissible temperature of operation of the drying system, since this would require large and expensive peripheral devices. The systems are generally designed to be self-regulating pressure vessel. That is to say, a condenser and a vacuum apparatus adapted to process the high steam flow under a higher pressure, and after drying decreased pressure also reduced.
A vacuum dryer is a device by removing the air inside the packaging container reaches a predetermined degree of vacuum after the removal of the inner member of the container moisture. Dry when the tank is in a vacuum, heating jacket through hot water (or steam, thermal oil), with the low-speed rotation of the tank, the material in the water the tank constantly up and down, inside and outside the movement and absorption into the diamond-shaped trajectory "evaporation, continuous discharge of steam through the vacuum line, drying purposes. Built-in spray drying the mixture at the same time, according to customer requirements, filtration, crushing and other devices can achieve its multifunction operation.
The vacuum drier is by removing the air inside the packaging container reaches a predetermined degree of vacuum after the removal of the inner member of the container moisture equipment. Dry during operation, the tank is in a vacuum state, the heating jacket to the hot water (or steam, HTF), as the tank low-speed rotating, material in the tank continuously up and down, inside and outside into the "diamond track movement and absorbs evaporation, water steam continuously discharged through the vacuum line to achieve drying mesh. Built-in spray drying the mixture at the same time, according to customer requirements, filtration, crushing and other devices can achieve its multifunction operation.
Vacuum dryer Classification
Double Cone Rotary Vacuum Dryer
Double cone rotating vacuum drier is widely used in the chemical, pharmaceutical, food and other industries powdered, granular and fibrous materials concentrated, mixing, drying, and the need for low-temperature drying of materials (such as biochemical products), suitable for the easily oxidized, volatile, heat-sensitive strong stimulus, toxic materials, and do not allow the destruction of crystalline materials dry. Double Cone Rotary Vacuum Dryer belt / chain two elastic coupling, and thus the equipment running smoothly. Special design process, fully reflects the two-axis good concentricity, HTM and vacuum system are reliable mechanical seal or technology rotary joint. The machine can be variable speed, but also thermostatic control. The heat transfer medium from the high temperature thermal oil, the temperature steam and low temperature hot water readily available. Drying viscous material in the tank for you specially designed "copy board structure.
Rake vacuum dryer
Rake vacuum dryer is a conduction heat transfer dryer. The material does not directly contact with the heating medium is suitable for drying a small amount, not high temperatures and are easily oxidized mashed, the paste materials, the water content was 15% to 90%. Desiccator level harrow agitator blade is made from cast iron or steel, is mounted in the square shaft, a half of the blade direction of the left and the other half to the right. Shaft speed for 7 ~ 8r/min, and it is with gear box motor driven. While using the automatic steering apparatus, so that the direction of rotation of the shaft, once the rotating direction of the stirrer was changed at every 5 ~ 8min.
Plate Vacuum Dryer
Plate vacuum drier, also known as disc vacuum drier, the intermittent stirring on the basis of conduction dryer, a combination of a number of advanced technology, through continuous improvement, and developed a multilayer fixed hollow heating disc (also known as set out feed tray), transferrin rake stirred vertical continuous drying apparatus mainly by conduction. |
Vacuum dryer vacuum drying process is a complex, time-varying, nonlinear industrial process