In order to evaluate the performance standards of a vacuum dryer vacuum dryer industry is probably the only three basic criteria! "All" means material into the vacuum dryer equipment, in the case of constant amount of materials out of the moisture content of the material are shapely! Does not occur, the larger half of the moisture content this case half of the moisture content. The "dry" refers to the basic characteristics of vacuum dryer! Material into the vacuum dryer equipment is wet moisture.
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.
Vacuum Dryer
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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 is mainly based on the solid nature of production capacity and mode of operation, and other factors to decide.
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.
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.
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Make the product drying effect change an important driving force is the temperature of the evaporation of the liquid contained, and vacuum dried to this 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.
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 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".
Vacuum dryer applications range widely, drying various industrial materials, is a general-purpose drying equipment, introduce below freezing process and application areas under vacuum freeze-drying machine.
The vacuum freeze-drying machine for drying a technique is the use of the principle of sublimation is to be dried material rapid freezing at a low temperature, and then, under proper vacuum environment, so that the frozen water molecules directly sublimated into the vapor escaping process the dried product of the freeze-drying machine is referred to as a lyophilisate, this drying process is referred to lyophilization. Dried product before drying is always maintained in a frozen state, while ice is uniformly distributed in the material, a process called sublimation concentrated phenomenon does not occur due to dehydration, to avoid the foam, oxidation, and other side effects generated by the water vapor. The dried material was dry sponge porous volume basically unchanged, easily soluble in water and restitution. To the maximum extent possible to prevent the degeneration of the physical, chemical and biological aspects of the dry matter.
Vacuum Dryer
Layers of the heating plate are heat carrier outlet tubes Usually the upper layers using a low-pressure saturated steam, or hot water, hot oil, in series, parallel or series-parallel input heating and control layers temperature; the bottom Layer pass into the cooling water, to reduce the product temperature, heat recovery, and to ensure quality. Heating plate at certain intervals fixed in the cylinder frame is horizontal placement, vacuum dryer
Cross boom, during which each floor are equipped with upper and lower dislocation 45 ° staggered fixed in the center of the spindle by worm gear reducer, continuously variable transmission and motor-driven, rotating slowly to 0.6 ~ 3.7 (r / min). Each jib tops how support detachable plow-shaped rake leaves or flat scraper, was equally spaced. Is hinged to rake leaves and reeds swing structure, so that the bottom edge as even floating disk, the angle can be adjusted according to material traits rake leaves, in order to ensure that the material in the disk is constantly advancing.
Dried material from the top disc feeder is continuously applied to the device within the first layer of the top of the heating plate inner disk on the side of the roll was stirred under a mechanical action of the rotary rake leaves, while from the inside outwards the continuous forward movement was serrated covered the entire disk, get contact heating drying; then the material from the outer edge of the drop to the second layer below the heating coil outer ring disk sequential shift, in reverse install rake leaves under, and from the outside in to the inner edge of the fall on the third layer of the small heating coil inner disk. And so on, so that the material layer by layer from top to bottom layer moving, continuous heating and drying.
Moisture is evaporated and equipment exhaust mixed from the top outlet expelled naturally, the final dry material to fall into the footwall, rake leaves scrape the bottom of the discharge port is continuously discharged, qualified dry finished. Based on product performance, drying and processing requirements for the amount of size, plate dryer with a spindle stepless speed manual adjustment sets the height adjustment disc feeder, control layers heating plate temperature distribution, the end of a series of measures to cool-down, played a The superiority of the plate dryer. |
The development and operation mode of the vacuum dryer