ABS powder drying method

Abstract

The invention provides an ABS powder drying method, comprising a step of powder drying and a step of powder recovery. In the step of powder drying the technology of utilization of waste heat of condensed water comprises conveying the steam condensed water in a nitrogen heater to a buffer hot water tank as heating medium hot water in a heater. A slurry recovery tank is connected to a bottom portion of a washing tower. The upper portion diameter of the washing tower is slightly bigger than the bottom portion diameter. No filling material and no tray floor are arranged inside the washing tower. The washing tower is provided with a demister, and second spray water in the upper portion of the washing tower. A split-range controller is arranged on the top portion of the washing tower. A first fire extinguishing device is installed in a fluidized bed dryer. A second fire extinguishing device is installed at the exit port of a cyclone separator. An oxygen detector is installed at a nitrogen inlet side of the nitrogen heater. The method of the invention has the advantages of full utilization of the waste heat, energy saving and consumption reduction, heat utilization efficiency improvement, short process flow, reduction of powder loss, reduction of equipment investment, high operation flexibility and stability in the whole technology process, a good ABS separating effect, and good safety performance.

Description

technical field [0001] The invention relates to the field of powder drying, in particular to an engineering plastic—ABS powder drying method. Background technique [0002] ABS resin (acrylonitrile-styrene-butadiene copolymer, ABS is the acronym for Acrylonitrile Butadiene Styrene) is a thermoplastic polymer material structure with high strength, good toughness and easy processing. [0003] The water-containing ABS powder is dehydrated by a centrifuge, and the water content is about 30%, and it is sent to the dryer through a feeder. The wet powder entering the dryer is evenly distributed on the bed of the fluidized bed dryer by the powder disperser. The air used for drying is filtered, inhaled and pressurized by the fan, and then sent to the bed of the dryer after being heated by the air preheater, and fully contacted with the wet powder. In the process of contacting with hot air, the water on the surface of the wet powder evaporates, and the water content of the surface la...

AI Technical Summary

Problems solved by technology

The patented technology has a long process flow and a large number of equipment. The process requires water replenishment in the mist eliminator, so that the powder can easily enter the centrifugal filtration section, and the water is used in the filter and cyclone water foam dust collector through the pump, resulting in running The increase in cost; secondly, the operating flexibility is small. Once the ABS is unevenly mixed, the amount of ABS particles carried in the circulating air will increase, which will make the cyclone water spray dust collector, mist eliminator and filter unable to meet the load; set up a separate process in the process Powder filter, used to remove solid particles in washing water, increases equipment investment

Images