LPG series high-speed centrifugal spraying dryer The principle of this kind of spraying drying atomizer is that liquid materials are thrown out and atomized by centrifugal force from the edge of the dish that is rotating at high speed (linear speed at 90 to 160m/s).The whole system adopts such a style to dry, that is, hot air medium open circulation plus materials flowing concurrently. Features: 1) Short drying time due to large surface area of droplet groups 2) Power has small granule (80 to 200 meshes) and good flowability 3) Large flexibility of operation 4) Heat utilization rate is higher than that of other spraying when air temperature is over 150oC 5) No high requirements for factory buildings YPG series pressurized spraying and granulation dryer The principle of its atomization is that liquid which gets high pressure (1 - 10Mpa) from high-pressure pump transfers pressure into kinetic energy when it passes through the spray nozle, and is sprayed out at high speed to become droplets. Advantages: 1) Mass atomization power 2) Easy operation, maintenance and replacement 3) Larger granularities Disadvantages: 1) High pressure pump is needed 2) Nozzle is easily blocked up 3) Liquid materials should be filtered strictly 4) Large wearing of nozzles 5) Not easy to atomize for high viscosity liquid: instant milk powder, cocoa powder, coffee granule disperse dyestuff, alkaline dyestuff, propyl methanol, ovoflavin VB2, medicinal yeast Sterilized spraying dryer From the view of sterilized spraying drying production both at home and abroad and experiences of our factory to produce sterilized spraying dryer these years, we thought sterilized materials have good properties, higher heat sensitive temperature and weak humid-absorbing performance. We make spraying drying test on ten odd sterilized materials such as sodium phosphonomycin and streptomycin. We found that when inlet air is at temperature of 160 - 260oC, only shaking the wall of the tower, no materials will be stuck on the wall and in air pipe. Good drying condition and sterilization of drying system are something important. GMP and FDA standards clearly defined that the surface of equipment which contacts medicine or its content should be smooth, plain, easy cleaned and sterilized, corrosion resistant, no reaction or adsorption will occur and no penetration or crack on surface in order to reduce dust or microbe collection and bear repeat use of cleaner. So the materials of equipment should be 316 or carbon steel FDA recommended (1 Cr18Ni9Ti is confined as it can become corrosive with CL-ion and 304 is used in not important case). Its surface should be polished and dimmed. Non-metal materials are chosen from PTFE, silica rubber of nylon. 300oC high temperature online sterilization is adopted and all equipment and pipes have fast-open mouths for dismounting and cleaning. The clean degree of the system should be hundred level.