First. Overview
ZPG type vacuum rake drier line horizontal intermittent conduction Drying equipment, for oxidation, easily broken, heat-sensitive type granular powder, paste, paste material drying process, such as Pigment, fuel and intermediates, plastics, resins, inorganic salts, and clay and other drugs.
This machine by means of a central shaft rake leaves, timing intervals reverse rotation, the material is rotated to move forward with the rake leaves on both sides, and with the reverse rotation center remitted by both sides. Since in rake leaves, stirring constantly, when the material and the cylinder wall contact surfaces constantly updated, and is indirectly heated by steam, the inner parts of the wet material continuously vaporized while being vacuum pump promptly withdrawn. Given the high degree of operating vacuum 400-700mmHg, wet parts of lower boiling point, the vapor pressure of the material surface of the wet parts of the machine is much larger than the wet parts of the vapor space of the vapor pressure, beneficial to its internal parts wet evaporation, promotes drying, so as to achieve the purpose of drying. Depending on the product properties and requirements, after a certain drying time, drying the finished product from the lower portion of the cylinder quick opening discharge, typically up to a moisture content of 0.1% to 0.05% (wet).
Second, the principle
vacuum rake drier is the use of the material in the water in a vacuum state to reduce the boiling point of the characteristics of drying equipment. The device is indirectly heated with steam jacket, water evaporation and heat extraction in time. In the drier casing, rake end axis design has a certain angle. Spindle reverse rotation by the forward axial movement of the material in order to facilitate drying and discharging.
Third, the characteristics of the device
1, uniform drying, to avoid oxidation, overheating, low moisture content of the product obtained, the product does not need to smash particles less demanding material to packaging.
2, high ZPG vacuum rake drier evaporation intensity, generally evaporate 10-15㎏ (water) / m · h.
3, ZPG vacuum rake drier air is no intervention, condenser load is small, the solvent can be easily recovered materials.
4, solvent vapor entrainment after the bag filter and no environmental pollution.
5, ZPG vacuum rake drier small amount of steam, because the vacuum rake drier and more steam through the jacket, the use of steam for heating material, Handled amount of steam consumption per kilogram of finished product is small, typically 1.3 to 1.5㎏ steam.
6, ZPG vacuum rake drier outlet valve in the cylinder body ball valve without dead ends, easy unloading.
7, the heat medium can be water vapor, thermal oil, hot water or boiler flue gas.
8, vacuum rake drier simple, low capacity, low labor intensity.
9, little material to escape, reducing costs while also improving the environment.

ZPG vacuum rake drier finger shaft installation site

Fourth, the main technical parameters