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ABS powder drying method

A drying method and powder technology, applied in the direction of drying solid materials, drying gas arrangement, heating to dry solid materials, etc., can solve the problems of unsatisfactory load, increased operating costs, and increased equipment investment, etc., to reduce powder The effect of reducing the loss, reducing equipment investment, and operating flexibility

Active Publication Date: 2012-08-08
CHINA TIANCHEN ENG +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • ABS powder drying method
  • ABS powder drying method

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Effect test

Embodiment 1

[0028] A drying method for ABS powder, comprising a powder drying step and a powder recovery step, wherein

[0029] In the powder drying step: the ABS powder is evenly added to the fluidized bed dryer 3 through the feeding valve 1, and the ABS powder is dried by the heater 2 in the fluidized bed dryer and the circulating hot air flow, and the fluidized bed The hot air discharged from the dryer is mixed with a certain concentration of fine powder. After passing through the cyclone separator 6, the separated powder passes through the first rotary valve 7, returns to the discharge port of the fluidized bed dryer 3, and passes through the second rotary valve. After 17, it is transported to the packaging by air flow to complete the drying of the powder.

[0030] The waste heat utilization process of condensed water is also set in the powder drying step: the process system includes a nitrogen heater 5, a heater 2 inside the fluidized bed dryer 3, a buffer hot water tank 10 and a fir...

Embodiment 2

[0042] A drying method for ABS powder, comprising a powder drying step and a powder recovery step, wherein

[0043] In the powder drying step: the ABS powder is evenly added to the fluidized bed dryer 3 through the feeding valve 1, and the ABS powder is dried by the heater 2 in the fluidized bed dryer and the circulating hot air flow, and the fluidized bed The hot air discharged from the dryer is mixed with a certain concentration of fine powder. After passing through the cyclone separator 6, the separated powder passes through the first rotary valve 7, returns to the discharge port of the fluidized bed dryer 3, and passes through the second rotary valve. After 17, it is transported to the packaging by air flow to complete the drying of the powder.

[0044] The waste heat utilization process of condensed water is also set in the powder drying step: the process system includes a nitrogen heater 5, a heater 2 inside the fluidized bed dryer 3, a buffer hot water tank 10 and a fir...

Embodiment 3

[0056] A drying method for ABS powder, comprising a powder drying step and a powder recovery step, wherein

[0057] In the powder drying step: the ABS powder is evenly added to the fluidized bed dryer 3 through the feeding valve 1, and the ABS powder is dried by the heater 2 in the fluidized bed dryer and the circulating hot air flow, and the fluidized bed The hot air discharged from the dryer is mixed with a certain concentration of fine powder. After passing through the cyclone separator 6, the separated powder passes through the first rotary valve 7, returns to the discharge port of the fluidized bed dryer 3, and passes through the second rotary valve. After 17, it is transported to the packaging by air flow to complete the drying of the powder.

[0058] The waste heat utilization process of condensed water is also set in the powder drying step: the process system includes a nitrogen heater 5, a heater 2 inside the fluidized bed dryer 3, a buffer hot water tank 10 and a fir...

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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 with a water content of about 30%, and then 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 layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B13/06B29B15/06F26B3/08F26B21/04F26B25/00
Inventor 耿玉侠刘团练马国栋杨克俭李强袁学民郑仁王美娇史骞
Owner CHINA TIANCHEN ENG
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