The equipment principle of vacuum rake dryer
Vacuum rake dryer is a kind of novel horizontal batch vacuum drying equipment, wet material by conduction evaporation, with scraper agitator removal of material on the surface of the heat, and goes on to form a cyclic flow within the container, moisture evaporates from a pump. Vacuum rake dryer, organic intermediate in chemical industry and fuel be applied dry operation.
Vacuum rake dryer device with steam jacketed indirect heating material, and under the high vacuum exhaust, so special adaptation is not high temperature resistant, easy to oxidation at high temperature of the material or dry prone to powder materials (such as all kinds of fuel), and ruled out in the process of dry steam or dry solvents must be recycled materials. Of the vacuum rake dryer dry material moisture or up to 90%, the volume of solvent and the lowest is only 15%. Be dry material paste, paste, granular, powder, also can be fibrous. The moisture content after drying of material generally reached 0.1%, even 0.05%.
Be dry material from joining shell above middle, constantly rotating stirring rake tine, material, when in contact with the shell wall surface constantly updated, dry material by indirect steam heating, and make the material of water gasification, gasification of water by the vacuum pump away in time, the machine can also use interlining and tine heating mode at the same time, the heat transfer area is larger, high thermal efficiency, make its get higher drying efficiency. Because the operating vacuum degree is higher, is dry material surface water vapor pressure is greater than the dry cabinet space evaporation of water vapor pressure in the body, thus to be dry material internal water and surface water discharge, to be dry material movement of water molecules, the purpose of drying.