CN202582132U - Drying system of ABS (acrylonitrile-butadiene-styrene) powder body - Google Patents
Drying system of ABS (acrylonitrile-butadiene-styrene) powder body Download PDFInfo
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- CN202582132U CN202582132U CN 201220172400 CN201220172400U CN202582132U CN 202582132 U CN202582132 U CN 202582132U CN 201220172400 CN201220172400 CN 201220172400 CN 201220172400 U CN201220172400 U CN 201220172400U CN 202582132 U CN202582132 U CN 202582132U
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- scrubbing tower
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Abstract
The utility model provides a drying system of an ABS (acrylonitrile-butadiene-styrene) powder body. The system comprises a powder drying device and a powder recovery device, wherein a waste heat utilization device for condensed water is arranged in the powder drying device, and the lower part of a washer in the powder recovery device is connected with a slurry recovery tank; the diameter of the upper part of the washer is slightly larger than that of the lower part of the washer, and a skimmer is arranged inside the washer except a filler and a column plate; and second spray water is also arranged at the upper part of the washer. The drying system also comprises a split controller for supplementing nitrogen and emission gas, a fire extinguishing device and an oxygen detection device. The drying system provided by the utility model has less investment, reduction in loss of powder, energy saving and emission reduction, the heat utilization efficiency is improved, the separation effect of ABS and the operating flexibility of a washing system are improved, and the safety performance is also greatly improved.
Description
Technical field
The utility model relates to powder drying field, particularly engineering plastics---the drying system of ABS powder.
Background technology
ABS resin (acrylonitrile-styrene-butadiene copolymer, ABS are the acronyms of Acrylonitrile Butadiene Styrene) is a kind of intensity height, good toughness, be easy to thermoplastics type's macromolecular material structure of machine-shaping.
Moisture ABS powder about 30%, is sent into drier through feeder through water content behind the centrifuge dewatering.The wet mash that gets into drier is evenly distributed on the fluidized bed dryer bed by the powder disperser.Desiccant air is sucked and pressurization by blower fan through filtering, and sends into the drier bed after heating up through air preheater again, fully contacts with wet mash.With process that hot-air contacts in the water evaporates on wet mash surface; The top layer water content reduces, and when the top layer water content was lower than inner ABS powder water content, inner moisture permeated to the top layer; Along with superficial water constantly evaporates; Internal moisture constantly to the top layer diffusion, reaches drying effect, and drier tail gas passes through the exhaust blower emptying after cyclonic separation.
In dry run, dry powder concentration in air reaches explosion limit easily, has the generation of electrostatic spark can light powder, and airborne oxygen can be combustion-supporting simultaneously.The danger of detonation can take place in drying system, causes the production that device can not safety and steady, even destroys drier and peripheral equipment thereof.
Patent CN 2499212Y discloses a kind of engineering plastics air-flow and fluidized bed drying method of nitrogen circulation; Adopt nitrogen as drying medium, through booster fan, fluidized drier; Dust filter unit; The nitrogen scrubbing tower has constituted the nitrogen drying system of sealing and circulating again to the booster fan reuse, can effectively reduce the danger of blasting in the dry run.This patent has only solved ABS powder drying process safe problem, and other are not mentioned such as energy-saving and cost-reducing, each device of whole system and the optimal design of flow process.
Patent CN 1508501A discloses the drying system of a cover ABS, adopts gas flow-fluidized bed combination drying technology, has incorporated nitrogen circulating system; Gas behind the horizontal cyclone foam deduster, gets into demister through the secondary cyclonic separation; Gas gets into scrubbing tower after the demist, after the washing dehumidifying, recycles, and sets up filter behind the demister; Water to containing ABS filters, and reaches the purpose that reclaims ABS.The technological process of this patented technology is long, and number of devices is more, and technological requirement needs moisturizing in demister, makes powder get into centrifugal filtration workshop section easily, and water uses in filter and whirlwind foam deduster through pump, has caused the raising of operating cost; Secondly, operating flexibility is little, in case the ABS blending is uneven, causes the ABS grain amount that carries in the circulating air to increase, and can make whirlwind foam deduster, demister and filter can not satisfy load; Set up independent powder filter in the flow process, with removing the solid particle in the washings, equipment investment increases.
The utility model content
The purpose of the utility model is the closed circuit nitrogen circulation fluidized bed drying system that a kind of safety, equipment investment is little, energy-saving and cost-reducing, operating flexibility is big ABS powder are provided.
The utility model provides a kind of drying system of ABS powder, comprises powder drying device and powder reclaiming device, wherein
The powder drying device comprises fluidized bed dryer and is arranged at heater wherein; Charging valve, fluidized bed dryer, cyclone separator link to each other successively; The bottom of cyclone separator is provided with first rotary valve, and material is returned the discharge port that is transported to fluidized bed dryer, and discharge port links to each other with second rotary valve; Material is transported to the packing of product through air-flow, accomplishes the drying of powder.
Powder reclaiming device comprises nitrogen circulation device and washing water cycling device, wherein
The nitrogen circulation device comprises air blast, nitrogen heater, air-introduced machine and scrubbing tower, and air blast links to each other with nitrogen heater, with sending into fluidized bed dryer after the nitrogen heating; Fluidized bed dryer links to each other with cyclone separator, sends into the bottom of scrubbing tower after the nitrogen pressure that has aqueous vapor that air-introduced machine will come out from cyclone separator, realizes the washing of emission gases, cooling, dehumidification treatments; Scrubbing tower links to each other with air blast, and nitrogen is discharged from the cat head from scrubbing tower, discharges the back and gets into air blast, realizes the circulation of nitrogen.
Washing water cycling device comprises second circulating pump, heat exchanger, cooler and scrubbing tower, and scrubbing tower links to each other with second circulating pump, heat exchanger through bottom line successively, and heat exchanger links to each other with cooler, and cooler links to each other with the top of scrubbing tower.The bottom wash water of scrubbing tower is squeezed into heat exchanger through second circulating pump, and this heat exchanger adopts 28-33 ℃ recirculated water cooling; The cooling back gets into cooler; Cooler adopts 5-10 ℃ water at low temperature to cool off, and from the top entering scrubbing tower of scrubbing tower, sprays downwards then, with the discharging gas that comes from air-introduced machine; Carry out counter current contacting and cool, dehumidifying.
Set up the powder filter in the washing water cycling device no longer separately; Powder is recycled the washings capture in scrubbing tower after; Along with the overflow water Artesian Drainage in the scrubbing tower is put into the slurries recycling can; This overflow water is the moisture that powder is brought in the dry run, has reduced the loss of powder, has reduced equipment investment.
Further, the residual heat using device of condensed water is set also in the powder drying device, it comprises nitrogen heater, heater, buffering hot-water cylinder and first circulating pump.The steam condensate (SC) of nitrogen heater is as the heat medium hot water in the heater; The buffering hot-water cylinder guarantees the stability of driving and system's operation, and circulates with the first circulating pump pressure-raising.Buffering hot-water cylinder available low-pressure steam simultaneously directly heats, and steam conveying pipe outside outside at drier and heater is provided with two thermometers simultaneously, and through dryer temperature and hot water temperature's tandem control steam flow, the hot water temperature is 85 ℃ of temperature in control.
Further, scrubbing tower is that upper diameter is bigger than normal than lower diameter, and ascending air speed reduces, ABS molecule that can sedimentation increases, and has reduced ascending air to the carrying of ABS powder, and has improved the clean result of separating effect and the tower of ABS.
Further; Scrubbing tower top is provided with demister, reduces entrainment, and the temperature of emission gases is reduced to 15-25 ℃ from 60-80 ℃; The humidity of circulating nitrogen gas is 0.01-0.02kg/kgN2; Through cooling, the water that dehumidifying removes is discharged into centrifugal dehydrator rear slurry recycling can in the bottom of scrubbing tower through the fluid-tight overflow, can recovery section ABS particle.
Further, scrubbing tower sets up second shower water in sea, demister top when the demister bottom is provided with shower water, and demister is carried out the flushing at intermittence, and the obstruction that prevents the ABS particle causes the rising of scrubbing tower pressure drop.
Further, the drying system of the utility model also is provided with the branch range controller that replenishes nitrogen and discharging gas, has guaranteed the stable of nitrogen circulation gas system; The branch range controller that should replenish nitrogen and discharging gas is built in the top at scrubbing tower, and the operating pressure of guaranteeing system is at 1-10KpaG.When system pressure is lower than setup pressure value, open nitrogen automatically and replenish valve, replenish nitrogen; When system pressure surpasses setup pressure value, open the nitrogen discharge valve automatically, rush down pressure; When guaranteeing that system pressure is stable, also guaranteed the renewal of circulating nitrogen gas.The big I of neglecting operational load greatly of this setting pressure adjusts.
Further, the drying system of the utility model also is provided with extinguishing device, and first extinguishing device is installed in drier; Second extinguishing device is installed in the exit of cyclone separator, and each extinguishing device comprises carbon-dioxide fire engine and steam smoothering secondary fire extinguishing system, sets up temperature control point; 105-135 ℃ of control temperature; Temperature surpasses setting value, starts carbon dioxide extinguisher installation automatically, in the control room, starts steam fire smothering system then; Effectively reduce the unexpected burning of dust, blast is to the possibility of damage of facilities.
Further; The drying system of the utility model also is provided with the oxygen detection device; Be installed in the oxygen detection appearance in nitrogen heater nitrogen inlet side, convenient drive and dry run in the oxygen content in the monitoring recyclegas in real time, guarantee that oxygen content is less than 3%; Prevent the destruction of closed system, guarantee that system produces under the safety operating mode.
The utility model compared with prior art good effect of its characteristics and generation is:
1, the drying system of the utility model is set up the powder filter no longer separately, but the overflow water Artesian Drainage that contains the ABS powder in the scrubbing tower is put into the slurries recycling can, has reduced the loss of powder, has reduced equipment investment.
2, the steam condensate (SC) recycle of the nitrogen heater of the utility model, waste heat utilizes nearby, and is energy-saving and cost-reducing, improved efficiency of utilization.
3, the scrubbing tower structure of the utility model; Can improve the separating effect of ABS; The ABS powder that prevents to cause because of preceding systematic failures can't effectively separate after getting into scrubbing tower, then air-introduced machine is impacted and stops up heater, has improved the operating flexibility of washing system.Simultaneously can guarantee that washings can effectively wash the scrubbing tower inwall, prevent the accumulation of particle, also reduce the pressure drop of scrubbing tower.In addition, the scrubbing tower operation divides process control through pressure, and stable operation, washings are through the secondary cooling, and cold fluid and hot fluid is directly contact in tower, and heat transfer efficiency is high, effectively reduces the water content in the circulating nitrogen gas, has guaranteed the low dirt and the low humidity of circulating air.
4, in the closed circuit nitrogen circulating system in the utility model; Carbon dioxide and steam smoothering secondary fire fighting device are installed on gas passage; Effectively reduced the dust explosion of ABS drying system, accident probabilities such as monomer burning, the security that has improved the ABS drying system; Design online oxygen detection system simultaneously, prevented the entering of unexpected oxygen.
Description of drawings
Fig. 1 is the drying system sketch map of a kind of ABS powder of the utility model.
1 charging valve, 2 heaters, 3 fluidized bed dryers, 4 air blasts, 5 nitrogen heaters, 6 cyclone separators; 7 first rotary valves, 8 first extinguishing devices, 9 second extinguishing devices, 10 buffering hot-water cylinders, 11 first circulating pumps; 12 air-introduced machines, 13 coolers, 14 heat exchangers, 15 second circulating pumps, 16 scrubbing towers; 17 second rotary valves, 18 fens range controllers, 19 oxygen detection appearance, 20 demisters, 21 second shower waters
The specific embodiment
Below in conjunction with specific embodiment the utility model is further described.
Embodiment 1
The utility model provides a kind of drying system of ABS powder, comprises powder drying device and powder reclaiming device, wherein
The powder drying device comprises fluidized bed dryer 3 and is arranged at heater 2 wherein; Charging valve 1, fluidized bed dryer 3, cyclone separator 6 link to each other successively; The bottom of cyclone separator 6 is provided with first rotary valve 7, and material is returned the discharge port that is transported to fluidized bed dryer 3, and discharge port links to each other with second rotary valve 17; Material is transported to the packing of product through air-flow, accomplishes the drying of powder.The residual heat using device of condensed water also is set in the powder drying device, and it comprises nitrogen heater 5, heater 2, buffering hot-water cylinder 10 and first circulating pump 11.The steam condensate (SC) of nitrogen heater 5 is as the heat medium hot water in the heater 2; Buffering hot-water cylinder 10 guarantees the stability of driving and system's operation, and circulates with first circulating pump, 11 pressure-raisings.Buffering hot-water cylinder 10 available low-pressure steam simultaneously directly heats; Be provided with two thermometers simultaneously in fluidized bed dryer 3 steam conveying pipe outsides outside and heater 2; Through dryer temperature and hot water temperature's tandem control steam flow, the hot water temperature is 85 ℃ of temperature in control.
Powder reclaiming device comprises nitrogen circulation device and washing water cycling device, wherein
The nitrogen circulation device comprises air blast 4, nitrogen heater 5, air-introduced machine 12 and scrubbing tower 16, and air blast 4 links to each other with nitrogen heater 5, with sending into fluidized bed dryer 3 after the nitrogen heating; Fluidized bed dryer 3 links to each other with cyclone separator 6, sends into the bottom of scrubbing tower 16 after the nitrogen pressure that has aqueous vapor that air-introduced machine 12 will come out from cyclone separator 6, realizes the washing of emission gases, cooling, dehumidification treatments; Scrubbing tower 16 links to each other with air blast 4, and nitrogen is discharged from the cat head from scrubbing tower 16, discharges the back and gets into air blast 4, realizes the circulation of nitrogen.Scrubbing tower 16 is that upper diameter is bigger than normal than lower diameter, reduces ascending air carrying the ABS powder; Scrubbing tower 16 tops are provided with demister 20; Reduce entrainment; The temperature of emission gases is reduced to 15-20 ℃ from 60-80 ℃ ℃, and the humidity of circulating nitrogen gas is 0.01-0.02kg/kgN2, through cooling; The water that dehumidifying removes is put into the slurries recycling can in the bottom of scrubbing tower 16 through fluid-tight overflow water Artesian Drainage, can recovery section ABS particle.Scrubbing tower 16 is also set up second shower water 21 on demister 20 tops when demister 20 bottoms are provided with shower water, demister 20 is carried out intermittence flushing, and the obstruction that prevents the ABS particle causes the rising of scrubbing tower pressure drop.
Washing water cycling device comprises second circulating pump 15, heat exchanger 14, cooler 13 and scrubbing tower 16; Scrubbing tower 16 links to each other with second circulating pump 15, heat exchanger 14 through bottom line successively; Heat exchanger 14 links to each other with cooler 13, and cooler 13 links to each other with the top of scrubbing tower 16.The bottom wash water of scrubbing tower 16 is squeezed into heat exchanger 14 through second circulating pump 15, and this heat exchanger 14 adopts 28-33 ℃ recirculated water cooling; The cooling back gets into cooler 13; Cooler 13 adopts 5-10 ℃ water at low temperature to cool off, and gets into the scrubbing tower spray downwards then from the top of scrubbing tower, and from air-introduced machine 12 and the discharging gas that comes; Carry out counter current contacting and cool, dehumidifying.
Powder reclaiming device is no longer set up the powder filter, and the overflow water Artesian Drainage that contains the ABS powder in the scrubbing tower 16 is put into the slurries recycling can, has reduced the loss of powder, has reduced equipment investment.
The drying system of the utility model also is provided with branch range controller 18, extinguishing device and the oxygen detection device that replenishes nitrogen and discharging gas, wherein
Extinguishing device is: first extinguishing device 8 is installed in fluidized bed dryer 3, and second extinguishing device 9 is installed in the exit of cyclone separator 6, and each extinguishing device comprises carbon-dioxide fire engine and steam smoothering secondary fire extinguishing system; Set up temperature control point, 105-135 ℃ of control temperature, temperature surpasses setting value; Automatically start carbon dioxide extinguisher installation; Then in the control room, start steam fire smothering system, effectively reduce the unexpected burning of dust, blast is to the possibility of damage of facilities.
The oxygen detection device is: be installed in oxygen detection appearance 19 in nitrogen heater 5 nitrogen inlet sides; Monitor the oxygen content in the recyclegas in convenient driving and the dry run in real time; Guarantee that oxygen content less than 3%, prevents the destruction of closed system, guarantee that system produces under the safety operating mode.
More than the preferred embodiment of the utility model is specified, but said content is merely the preferred embodiment of the utility model, can not be considered to be used to limit the practical range of the utility model.All equalizations of doing according to the utility model application range change and improve etc., all should still belong within the patent covering scope of the utility model.
Claims (10)
1. the drying system of an ABS powder; Comprise powder drying device and powder reclaiming device; They connect as a whole system through pipeline, and wherein the powder drying device comprises drier, are arranged at drier inner heater and cyclone separator; The top of drier links to each other with cyclone separator; Powder reclaiming device comprises nitrogen circulation device and washing water cycling device, and the cyclone separator of its set inside is connected through air-introduced machine with scrubbing tower, and scrubbing tower, air blast, nitrogen heater, drier connect successively; It is characterized in that: be provided with the residual heat using device of condensed water in the powder drying device, the residual heat using device of said condensed water comprises nitrogen heater, inner heater, buffering hot-water cylinder and first circulating pump of drier; The steam condensate (SC) of nitrogen heater is conveyed into the buffering hot-water cylinder as the heat medium hot water in the heater; The buffering hot-water cylinder links to each other with heater through first circulating pump.
2. the drying system of a kind of ABS powder according to claim 1 is characterized in that: the buffering hot-water cylinder also links to each other with low pressure steam line, and the steam conveying pipe outer setting of and heater outside at drier has two thermometers.
3. the drying system of a kind of ABS powder according to claim 1 is characterized in that: do not set up the powder filter in the washing water cycling device separately, said scrubbing tower bottom directly is connected with the slurries recycling can.
4. the drying system of a kind of ABS powder according to claim 1 is characterized in that: the upper diameter of said scrubbing tower is bigger than lower diameter.
5. the drying system of a kind of ABS powder according to claim 1 is characterized in that: filler and column plate are not established in said scrubbing tower inside.
6. the drying system of a kind of ABS powder according to claim 1 is characterized in that: said scrubbing tower is provided with demister.
7. the drying system of a kind of ABS powder according to claim 1 is characterized in that: second spray water system is also set up on said scrubbing tower top.
8. the drying system of a kind of ABS powder according to claim 1 is characterized in that: said drying system also is provided with the branch range controller that replenishes nitrogen and discharging gas, this minute range controller be built in top at scrubbing tower.
9. the drying system of a kind of ABS powder according to claim 1; It is characterized in that: said drying system also is provided with extinguishing device; First extinguishing device is installed in drier; Second extinguishing device is installed in the exit of cyclone separator, and each extinguishing device comprises carbon-dioxide fire engine and steam smoothering secondary fire extinguishing system.
10. the drying system of a kind of ABS powder according to claim 1 is characterized in that: said drying system also is provided with the oxygen detection device, and the oxygen detection appearance is installed on nitrogen heater nitrogen inlet side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220172400 CN202582132U (en) | 2012-04-23 | 2012-04-23 | Drying system of ABS (acrylonitrile-butadiene-styrene) powder body |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220172400 CN202582132U (en) | 2012-04-23 | 2012-04-23 | Drying system of ABS (acrylonitrile-butadiene-styrene) powder body |
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| CN202582132U true CN202582132U (en) | 2012-12-05 |
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| CN 201220172400 Expired - Lifetime CN202582132U (en) | 2012-04-23 | 2012-04-23 | Drying system of ABS (acrylonitrile-butadiene-styrene) powder body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3277404B1 (en) * | 2015-03-30 | 2024-05-01 | SABIC Global Technologies B.V. | Wet scrubbing high rubber graft abs particulate vent vapors |
-
2012
- 2012-04-23 CN CN 201220172400 patent/CN202582132U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3277404B1 (en) * | 2015-03-30 | 2024-05-01 | SABIC Global Technologies B.V. | Wet scrubbing high rubber graft abs particulate vent vapors |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121205 |