一、工作原理及应用范围介绍 Introduction of Working Principle and Scope of Application
Pulse pneumatic drying is also called instant drying, which forms pulse-type movement by using high-speed hot air flow to drive the material to make instant deceleration movement after instant acceleration movement. Its purpose is to intensify the heat and mass transfer so as to achieve efficient, fast and instant dehydration. It may not cause overheat or decomposition to the materials with heat sensitivity or low melting point. It is a continuous, efficient and fast drying method of fluidizing instant dehydration for solids and applicable to fast removing surface water from 5μm~5mm powdery and granular materials. This method may not deteriorate the materials dried and is applicable to drying and dehydrating powdery and granular materials in such industries as pharmaceuticals, chemical engineering, food, building materials and plastics, as follows:
l Pharmaceuticals and food: methaqualone, benzene tea pyrazolone, tea seed cake, Oxalic acid catalyst, precipitated carbon powder, p- acetnitrilobenzene sulfonyl ammonia, p-aminosalicylic acid, Duoermatuo, aureomycin, coke sodium silicate, chaff chlorate coffee grounds tetracycline and corn protein.
l Chemical engineering industry: ABC intermediate, ABS resin, ASC, white carbon black, accelerant mdm, contact agent, terephthalic acid, diethylaniline, titanium dioxide, active carbon, sodium fluosilicate, fluorspar, silica gel powder, synthetic resin, calcium phosphate, polypropylene, ferric oxide, calcium carbonate, iron oxide, calcium sulphate retarder, wood powder, sawdust and rice bran.
1.Particles disperse at high speed in the air flow and is in the suspending state, with the efficiency of heat and mass transfer between gas and solid phases increasing. At the same time, the pulse tube adopted increases the difference between the relative velocities of gas and solid phases and increases the volumetric heat transfer coefficient. So the overall heat efficiency is the highest among the fluidized driers.
2.The pulse pneumatic drier is a simple and compact structure with small volume. The whole set of unit costs little relatively.
3.The drying time is very short (only 0.5-2 seconds). So the equipment is applicable to heat sensitive materials.
4.Pneumatic drying of materials is fully completed in the tube. The products don’t contact with the outside, so there is little pollution and the products are of good quality and good appearance. The equipment is convenient to operate and has high degree of automation.
三、工艺流程图Process flow diagram
Technical parameters (the values in the table below are for reference in type selection only)