Double cone rotary vacuum dryer is a set of drying equipment, mixing, vacuum drying in one. Double cone rotary vacuum dryer for double cone rotating tank, tank in the vacuum state, the jacket is filled with steam or hot water for heating, heat through the inner wall of the tank body contact with the wet material, moisture evaporation materials after heat absorption, through the vacuum pump vacuum exhaust tube was removed. Because the vacuum in the tank body, and the rotary to materials constantly the flip, the drying rate of materials, improving drying efficiency, achieve the purpose of uniform drying. Double cone rotary vacuum dryer system is mainly composed of double cone rotary vacuum dryer, condenser, dust collector, vacuum pumping system, heating system, cooling system, electric control system etc..
Double cone rotary vacuum dryer, vacuum drying is to be dry material in the cylinder body sealing, vacuum system for vacuum drying materials at the same time on the continuous heating, the material inside the water by a pressure difference or differential concentration diffusion to the surface, the water molecules (or other non condensable gases) get enough kinetic energy in the material surface, diffusion to the low-pressure space vacuum chamber in overcoming the mutual attraction between molecules, pumped out by the vacuum pump and complete with solid separation. So, double cone rotary vacuum dryer is a characteristic:
(1) the process of vacuum drying, the cylinder pressure is always lower than the atmospheric pressure, less number of gas molecules, low density, low oxygen content, thus drying easy oxidation of drugs, reduce material contamination opportunity.
(2) because of moisture during vaporization temperature and steam pressure is proportional to, so the vacuum drying at low temperature, moisture can be vaporized material, low temperature drying, especially suitable for heat sensitive materials in pharmaceutical production.
(3) vacuum drying can eliminate surface hardening phenomenon caused by the atmospheric pressure hot air drying, this is because the vacuum drying material and surface pressure, the pressure gradient effect, water quickly move to the surface, no surface hardening.
(4) for the vacuum drying, the material between the internal and external temperature gradient is small, because the reverse osmosis allows moisture to move independently and collect, overcome the phenomenon of air drying the separated.
Double cone rotary vacuum dryer for drying of material properties
1) the material viscosity. Viscosity with material moisture changes, viscosity materials can be reunited into blocks, and the adhesion of cylinder wall, dry and easy adhesion in the dust collector and the pipe wall. The pneumatic shock and crushing device.
2) the permissible temperature materials. Allowable temperature is the highest temperature of the material can withstand. Over this temperature, material will cause the titer change, destruction or discoloration.
3) bulk density per unit volume of material quality of materials known as bulk density. Because the material is dry materials and mixture moisture, dry material often for granular, powder or solid bulk material, and with the material moisture in different cause dry gap particles are also different. There is a great difference between the bulk density of the original wet materials and materials during the drying process, the drying machine should be noted.
4) material slip angle stacked granular or powdery materials, when the material pile inclined plane and the bottom angle increases to a certain point of time, there will be side material sliding phenomenon. The occurrence of material angle bevel and bottom slide called slip the material angle. Slip angle and material composition, moisture content, particle size and viscosity of. Double cone rotary vacuum dryer, reference materials can slip angle, the cone angle. |
