Seeking appropriate drying equipment
Thread Content
This post was last edited by Dugu Lingyun on 2023-11-3 at 16:06. Our products and semi-finished products need to be dried; the materials are in the form of small balls with a particle size of 0.3–1.2 mm. The semi-finished products are white balls formed by the polymerization of styrene and divinylbenzene, while the finished products are resins to which various functional groups have been added. The drying temperature should not exceed 100°C, and the moisture content required after drying is below 0.5%, or even lower. It is desired to find a low-temperature, continuous, high-vacuum drying equipment that allows for control of mechanical compression during operation in order to reduce fragmentation; the material should remain inside the equipment for at least 2 hours, or even longer, with a processing capacity of no less than 500 kg/h (with a moisture content of around 50%). I wonder if there is a device similar to a single-screw conveyor, one in which both the outer wall and the screw are hollow, with pipes inside through which hot water or hot oil can be fed as a heating medium. Through the rotation of the screw, this device can not only transport the material from the inlet to the outlet but also mix and stir it. I hope that suitable equipment manufacturers will contact and communicate with me in a timely manner. VX: q531168326, Email: krhbjqx@163.com.
Based on your requirements and ideas, I think a low-temperature screw dryer might be a suitable option. The working principle of this device is that the continuous rotation of the screw ensures thorough mixing and stirring of the material inside the device. Hot water or hot oil can be introduced through the internal pipes to provide the necessary heating, and the drying temperature can be effectively controlled, making it suitable for low-temperature drying. The screw dryer is compactly designed, easy to operate, and capable of continuous production. It creates a vacuum environment inside, resulting in excellent drying effects. Furthermore, since the rotation of the screw itself generates thrust, it prevents the material from staying stagnant inside the equipment, thus ensuring the residence time of the material you mentioned. Furthermore, during operation, since the material is stirred and turned by the rotation of the screw, no mechanical compressive force is generated, which effectively reduces the problem of material fragmentation. The processing capacity of such equipment mainly depends on the diameter and rotation speed of the screw, and it can be adjusted according to actual needs to meet diverse production requirements. Of course, this is just a preliminary suggestion; whether it is suitable or not still needs to be determined based on your actual production conditions and requirements. We recommend that you have in-depth discussions with professional drying equipment suppliers to determine the most suitable solution. .
With such a high moisture content, it is necessary to first remove water mechanically and then dry it through heat conduction; this approach results in the most economical energy consumption. Two approaches were tried for industrialization: one is centrifugal dewatering plus a rotary dryer, and the other is a specially designed machine. From the perspective of drying processes, these are all routes that need to be explored and developed; pilot tests and industrial-scale production require numerous attempts, and there is a risk of failure. It would be best to collaborate with equipment manufacturers to provide some research and development funding, so that the specialized machines developed can incorporate proprietary technologies.
This moisture content has been achieved after watering, and it is similar to the effect of centrifugal dehydration; this water mainly consists of surface water and internal water (as resin particles have pores)
One stage of slurry dryer and two stages of fluidized bed dryer; of course, the selection of equipment also depends on factors such as the density of the material, the temperature it can withstand, and the desired size of the particles after dehydration. The size and shape of the material particles before entering the drying process also require appropriate equipment for control, such as granulators. After the drying process, an air-conveying system can be used for secondary granulation, followed by particle screening, after which the finished product can be packaged