CN113730944A - System for reducing content of ultrafine dust in production process of PET (polyethylene terephthalate) bottle grade polyester chips - Google Patents
System for reducing content of ultrafine dust in production process of PET (polyethylene terephthalate) bottle grade polyester chips Download PDFInfo
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- 239000000428 dust Substances 0.000 title claims abstract description 93
- 229920000728 polyester Polymers 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 229920000139 polyethylene terephthalate Polymers 0.000 title description 31
- 239000005020 polyethylene terephthalate Substances 0.000 title description 31
- -1 polyethylene terephthalate Polymers 0.000 title description 3
- 230000003068 static effect Effects 0.000 claims abstract description 130
- 238000000746 purification Methods 0.000 claims description 57
- 230000005611 electricity Effects 0.000 claims description 53
- 230000008030 elimination Effects 0.000 claims description 50
- 238000003379 elimination reaction Methods 0.000 claims description 50
- 239000002245 particle Substances 0.000 claims description 28
- 238000003795 desorption Methods 0.000 claims description 15
- 239000008187 granular material Substances 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 6
- 238000009835 boiling Methods 0.000 claims description 4
- 239000000523 sample Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 20
- 238000002425 crystallisation Methods 0.000 abstract description 12
- 230000008025 crystallization Effects 0.000 abstract description 12
- 230000004048 modification Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 49
- 239000000843 powder Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 239000000047 product Substances 0.000 description 9
- 238000001179 sorption measurement Methods 0.000 description 9
- 239000012535 impurity Substances 0.000 description 8
- 238000006068 polycondensation reaction Methods 0.000 description 7
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000007790 solid phase Substances 0.000 description 5
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- FYIBGDKNYYMMAG-UHFFFAOYSA-N ethane-1,2-diol;terephthalic acid Chemical compound OCCO.OC(=O)C1=CC=C(C(O)=O)C=C1 FYIBGDKNYYMMAG-UHFFFAOYSA-N 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007907 direct compression Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D49/00—Separating dispersed particles from gases, air or vapours by other methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
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- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a system for reducing the content of ultrafine dust in the production process of PET bottle-grade polyester chips, which relates to the technical field of production of PET polyester chips and comprises a cache bin, a pre-crystallizer and a crystallizer which are connected, wherein a first static eliminating device and a first dust separator are arranged between the cache bin and the pre-crystallizer, the pre-crystallizer is also connected with a first air purifying device, a second static eliminating device and a second dust separator are arranged between the pre-crystallizer and the crystallizer, and the crystallizer is also connected with a second air purifying device. The method has the advantages that the method is reasonable in design, the problem of high ultrafine dust in the pre-crystallization stage of the bottle chip grade polyester chip can be thoroughly solved, the method is suitable for design of a newly-built polyester chip production device and modification application of the existing polyester production device, and uniformity and product quality of the polyester chip are improved.
Description
Technical Field
The invention relates to the technical field of polyester chip PET production, in particular to a system for reducing the content of ultrafine dust in the production process of PET bottle-grade polyester chips.
Background
Polyester chip (polyethylene terephthalate, PET) is produced by polymerization of terephthalic acid and ethylene glycol. The polyester can be divided into fiber grade polyester chips, bottle grade polyester chips and film grade polyester chips according to the application. Polyester chips are generally produced by the principle of the direct compression method: the terephthalic acid and ethylene glycol EG are directly esterified to generate ethylene glycol terephthalate, and then the ethylene glycol terephthalate is subjected to a homo-polycondensation reaction to generate PET. Wherein the PET generated by polymerization reaction is filtered to remove impurities, and is cut into basic slices of particles with certain specifications by a dicing cutter after being cast. In order to improve the crystallinity of the slices, the basic slices need to be subjected to solid phase polycondensation treatment, namely, the polycondensation reaction is carried out in a solid state, and finally a PET product is obtained.
In the production process of PET bottle grade polyester chips, especially PET basic chips subjected to solid phase polycondensation, the content of superfine powder in the PET basic chips must be strictly controlled, and the problems that the viscosity of chip products is increased, the melting point and the crystallinity are increased, the processability of the products is poor and the downstream injection molding extrusion process is influenced due to the fact that the superfine powder is easy to facilitate small molecule diffusion due to polycondensation are prevented. Therefore, the content of dust (fine powder) must be effectively controlled before the solid-phase polycondensation treatment of the bottle-grade polyester chip, so as to produce the uniform and high-quality PET product. However, in the actual slicing process, the uncrystallized basic slices are usually materials in a metal storage (buffer) bin conveyed by long distance pneumatic power, and a large amount of dust is generated in the conveying process; in addition, the PET basic slices not only contain dust (ultrafine powder) in the PET basic slices due to severe collision, friction, extrusion by equipment and the like in the gas conveying process, but also carry a large amount of static electricity by the slice granules. The charged PET basic slice granules firmly adsorb the ultrafine dust on the surfaces of the granules due to electrostatic adsorption. Because the ultrafine dust adsorbed by static electricity in the basic slice has great influence on the pre-crystallization treatment of the polyester slice and even the uniformity of the final product, necessary measures are needed to be adopted to gradually eliminate the static electricity and desorb the dust in the PET slice, so that the content of the dust in the PET basic slice is reduced, and the requirement of downstream users on high-quality slice products is met.
The traditional chips are dedusted by introducing dust-containing gas in a pre-crystallizer and a crystallizer into a gas purification system mainly through air flow in the pre-crystallization process, but because the pre-crystallizer is in a boiling bed form, the chips are subjected to surging friction under the action of a large amount of reciprocating circulating air, so that dust and static electricity are generated simultaneously, and the dust amount under the action of electrostatic adsorption is difficult to completely remove, so that the problem of ultrafine dust adsorbed on the surfaces of the chip granules due to static electricity cannot be solved by the pre-crystallizer, the solid-phase polymerization process or the dedusting system disclosed in patents CN1047531B, CN204373315U, CN101392051B, CN206622398 and the like.
Disclosure of Invention
The invention discloses a system for reducing the content of ultrafine dust in a PET bottle grade polyester chip production process, aiming at solving the technical problems of dust electrostatic adsorption in the PET chip and reduction of the content of dust in a PET basic chip, and the system is used for improving the uniformity and the product quality of the polyester chip.
In order to achieve the purpose, the invention adopts the following technical scheme:
system for reduce superfine dust content in PET bottle level polyester chip production process, its characterized in that includes:
the buffer storage bin is used for temporarily storing the normal-temperature basic slices;
the pre-crystallizer is used for pre-crystallizing the basic slice particles subjected to primary static elimination and primary ultrafine dust desorption treatment;
and the crystallizer is used for crystallizing the basic slice particles subjected to secondary static elimination and secondary ultrafine dust desorption treatment.
As a further preferred embodiment of the present invention, the bottom outlet of the buffer bin is connected to the top inlet of the pre-crystallizer, and a first rotary feeder, a first static electricity eliminating device and a first dust separator are installed on the conveying pipeline connecting the buffer bin and the pre-crystallizer, wherein the first static electricity eliminating device eliminates static electricity on the surface of the basic slice particles once, and the first dust separator realizes desorption treatment of adsorbing ultrafine dust once.
As a further preferred aspect of the present invention, the lateral outlet of the upper part of the pre-crystallizer is connected to the inlet of the first gas purification device, the outlet of the first gas purification device is connected to the lateral inlet of the lower part of the pre-crystallizer, and the first gas purification device realizes a primary gas purification treatment, i.e., the first gas purification device can remove fine powder and dust generated by the surging of the basic slice particles under the action of a large amount of reciprocating circulating air at a time.
As a further preferred aspect of the present invention, an electrostatic voltage probe is further installed inside the pre-crystallizer, and is used for measuring and characterizing static electricity generated by the PET base slice particles due to boiling friction, and providing reference data for adjusting the static elimination parameters of the first static elimination device.
As a further preferred aspect of the present invention, the bottom outlet of the pre-crystallizer is communicated with the inlet of the crystallizer, and a second rotary feeder, a second static elimination device and a second dust separator are installed on a conveying pipeline where the pre-crystallizer is communicated with the crystallizer, wherein the second static elimination device is used for realizing secondary static elimination on the surface of the pre-crystallized sliced particles, and the second dust separator is used for realizing secondary desorption treatment of adsorbed ultrafine dust.
As a further preferred aspect of the present invention, the outlet at the top of the crystallizer is connected to the inlet of the second gas purification device, the outlet of the second gas purification device is connected to the outlet at the lower part of the crystallizer, and the second gas purification device realizes secondary gas purification treatment, i.e. secondary removal of fine powder and dust generated by the surging of the basic slice particles under the action of a large amount of reciprocating circulating air.
As a further preferred aspect of the present invention, each of the first and second static electricity eliminating apparatuses includes a static electricity monitor, a static electricity eliminator, and a control system module.
As a further preferred embodiment of the present invention, the static electricity monitor is mounted at a lower portion of the static electricity eliminator, and is configured to detect a charged amount of the slice, provide a feedback signal to the static electricity eliminator, and adjust a discharge capacity of the static electricity eliminator.
As a further preferable mode of the present invention, the electrostatic eliminator is a high voltage output module, and the high voltage output module is installed in an explosion-proof junction box outside the electrostatic eliminator body, so that the electrostatic eliminator can bear the temperature of an internal transmission medium exceeding 200 ℃ when in operation.
As a further optimization of the invention, the static electricity eliminator adopts a positive pressure design and is externally connected with an instrument wind source, wherein the pressure of the instrument wind source after purification treatment is not less than 0.6 MPa.
As a further preferable mode of the present invention, a first fan and a first heat exchanger are further disposed on a pipeline of the first gas purification device, the pipeline being communicated with the pre-crystallizer, and the first gas purification device, the first fan and the first heat exchanger are all subjected to heat preservation treatment to ensure the stability of the temperature of a large amount of reciprocating circulating air.
As a further preferable mode of the present invention, a second fan and a second heat exchanger are further disposed on a pipeline of the second gas purification device, which is communicated with the crystallizer, and the second gas purification device, the second fan and the second heat exchanger are all subjected to heat preservation treatment to ensure the stability of the temperature of a large amount of reciprocating circulating air.
As a further preferred aspect of the present invention, the system further comprises a third gas purification device, and the third gas purification device is connected to the first static elimination device and the second static elimination device through pipelines, respectively.
The beneficial effect of the invention is that,
1. the basic slice material is subjected to primary static elimination and primary ultrafine dust desorption treatment and then enters a pre-crystallizer, and a first static elimination device eliminates the static electricity of the basic slice and inhibits the static adsorption effect of the static electricity on dust generated in the slice pre-crystallization process; free moisture, impurities and dust in the basic slices can be removed in a reciprocating circulating air system constructed among the pre-crystallizer, the first gas purification device, the first fan and the first heat exchanger;
2. the pre-crystallized basic slices are subjected to secondary static elimination and secondary ultrafine dust desorption treatment and then enter the crystallizer, the second static elimination device further performs static elimination treatment on the basic slices, desorption of dust adsorbed on the surface due to static is realized, ultrafine powder among the granules and adsorbed on the surfaces of the granules is thoroughly eliminated, and free moisture, impurities and dust in the basic slices can be further removed in a reciprocating circulating air system constructed among the crystallizer, the second gas purification device, the second fan and the second heat exchanger.
The method has reasonable design, provides a high-performance polyester chip, can thoroughly solve the problem of high ultrafine dust in the pre-crystallization stage of the bottle-chip polyester chip, is suitable for the design of a newly-built polyester chip production device and the modification application of the existing polyester production device, and improves the uniformity and the product quality of the polyester chip.
Drawings
FIG. 1 is a schematic structural view of the present invention;
wherein, 1-caching a stock bin; 2-a pre-crystallizer; 3-a crystallizer; 4-a first rotary feeder; 5-a second rotary feeder; 6-third rotary feeder; 7-a first static eliminating device; 8-a second static elimination device; 9-a first gas purification device; 10-a second gas purification device; 11-a third gas purification device; 12-a first fan; 13-a second fan; 14-a first heat exchanger; 15-a second heat exchanger; 16-a first dust separator; 17-second dust separator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in the figure, the system for reducing the content of ultrafine dust in the production process of PET bottle grade polyester chips mainly comprises:
the buffer storage bin 1 is used for temporarily storing the normal-temperature basic slices;
the pre-crystallizer 2 is used for pre-crystallizing the basic slice particles subjected to primary static elimination and primary ultrafine dust desorption treatment;
and the crystallizer 3 is used for crystallizing the basic slice particles subjected to secondary static elimination and secondary ultrafine dust desorption.
Particularly, a bottom outlet of the buffer storage bin 1 is connected with a top inlet of the pre-crystallizer 2, a first rotary feeder 4, a first static elimination device 7 and a first dust separator 16 are installed on a conveying pipeline for communicating the buffer storage bin 1 and the pre-crystallizer 2, and the first rotary feeder 4 is used for conveying the basic slice particles in the buffer storage bin 1 to the pre-crystallizer 2 through the first static elimination device 7 and the first dust separator 16 in sequence; wherein the first static eliminating device 7 realizes the primary static elimination of the surface of the basic slice particles, and the first dust separator 16 realizes the primary desorption treatment of adsorbing ultrafine dust.
Particularly, the lateral outlet of the upper part of the pre-crystallizer 2 is connected with the inlet of a first gas purification device 9, the outlet of the first gas purification device 9 is connected with the lateral inlet of the lower part of the pre-crystallizer 2, and the first gas purification device 9 realizes primary gas purification treatment, so that fine powder and dust generated by the surging of the basic slice particles under the action of a large amount of reciprocating circulating air can be removed at one time.
In particular, an electrostatic voltage probe is also installed inside the pre-crystallizer 2, and is used for measuring and characterizing the static electricity generated by the PET basic slice particles due to boiling friction, and providing reference data for adjusting the electricity eliminating parameters of the first static electricity eliminating device 7.
Particularly, the outlet at the bottom of the pre-crystallizer 2 is communicated with the inlet of the crystallizer 3, a second rotary feeder 5, a second static elimination device 8 and a second dust separator 17 are arranged on a conveying pipeline for communicating the pre-crystallizer 2 with the crystallizer 3, wherein the second static elimination device 8 realizes secondary static elimination on the surface of the pre-crystallized sliced particles, and the second dust separator 17 realizes secondary desorption treatment for adsorbing ultrafine dust.
Particularly, the outlet at the top of the crystallizer 3 is connected with the inlet of a second gas purification device 10, the outlet of the second gas purification device 10 is connected with the outlet at the lower part of the crystallizer 3, and the second gas purification device 10 realizes secondary gas purification treatment, so that fine powder and dust generated by the surging of basic slice particles under the action of a large amount of reciprocating circulating air can be removed secondarily.
In particular, the first static eliminator 7 and the second static eliminator 8 each include a static monitor, a static eliminator, and a control system module, and the static monitors and the static eliminators are both mounted on the conveying pipeline through flanges.
In particular, the static monitor is arranged at the lower part of the static electricity eliminator and is used for detecting the slice electrification amount, providing a feedback signal for the static electricity eliminator and adjusting the electricity eliminating capacity of the static electricity eliminator.
Particularly, the static electricity eliminator is a high-voltage output module, and the high-voltage output module is arranged in an explosion-proof junction box outside the static electricity eliminator body, so that the static electricity eliminator can bear the temperature of an internal conveying medium exceeding 200 ℃ when in work.
Particularly, the static electricity eliminator adopts a positive pressure design, the pressure of an instrument wind source is not less than 0.6MPa through an external instrument wind source, and instrument wind generated by the instrument wind source needs to be purified by the third gas purification device 11, so that the slice is prevented from being polluted by impurities such as liquid drops, oil drops or rust in the instrument wind.
The static monitor can monitor the static quantity of the slices in real time in the conveying process, and the static eliminator eliminates the static of the slices, thereby effectively inhibiting and eliminating the adsorption of the slice particles on the superfine powder due to the static effect; effectively utilize gas purification system to filter and eliminate the dust that the section carried.
Particularly, a first fan 12 and a first heat exchanger 14 are further arranged on a pipeline of the first gas purification device 9 communicated with the pre-crystallizer 2, and the first gas purification device 9, the first fan 12 and the first heat exchanger 14 are all subjected to heat preservation treatment to ensure the stability of the temperature of a large amount of reciprocating circulating air.
Particularly, a second fan 13 and a second heat exchanger 15 are further arranged on a pipeline of the second gas purification device 10 communicated with the crystallizer 3, and the second gas purification device 10, the second fan 13 and the second heat exchanger 15 are all subjected to heat preservation treatment to ensure the stability of the temperature of a large amount of reciprocating circulating air.
Particularly, the system further comprises a third gas purification device 11, wherein the third gas purification device 11 is respectively connected with the first static elimination device 7 and the second static elimination device 8 through pipelines, and the third gas purification device 11 provides gas purification treatment for the first static elimination device 7 and the second static elimination device 8.
The invention comprises the following steps:
the PET basic slice particles in the pre-crystallizer 2 and the slice particles after the pre-crystallization of the PET basic slice are subjected to static elimination treatment through primary static elimination and secondary static elimination treatment, then the ultrafine dust desorbed from the inside and the surface of the PET is separated from the slice particles through large air volume and is brought into the first gas purification device 9 and the second gas purification device 10, and the ultrafine powder between the PET basic slice particles and adsorbed on the surfaces of the particles is thoroughly removed.
Example 2
The base slices designed in this example were pellets.
The method comprises the following steps that a certain amount of dust is carried in basic slice aggregates in a cache bin 1, the basic slice aggregates stored in the cache bin 1 are conveyed to a pre-crystallizer 2 through a first static elimination device 7 and a first dust separator 16 by a first rotary feeder 4, the first static elimination device 7 adopts the existing bipolar ion wind static elimination technology, a static monitor with static electricity detects the static electricity of the basic slices and timely adjusts the electricity elimination parameters of an electricity eliminator, and the first static elimination device 7 adopts remote online detection and control; the static electricity eliminator adopts compressed air as positive pressure protective gas, and the pressure of a wind source is 1.0 MPa.
The static charges carried by the basic slice granules are eliminated by the first static eliminating device 7, the static adsorption effect of the static on dust generated in the slice pre-crystallization process is inhibited, the static-eliminating treatment is carried out, the static-eliminating treatment enters the pre-crystallizer 2, and free moisture, impurities and dust in the basic slices can be removed in a reciprocating circulating air system constructed among the pre-crystallizer 2, the first gas purifying device 9, the first fan 12 and the first heat exchanger 14.
The material is conveyed into the crystallizer 3 from the crystallizer 3 by a second rotary feeder 5 through a second static electricity eliminating device 8 and a second dust separator 17, the second static electricity eliminating device 8 further carries out electricity eliminating treatment on the pre-crystallized basic slices, and free moisture, impurities and dust in the basic slices can be further removed in a reciprocating circulating air system constructed among the crystallizer 3, a second gas purifying device 10, a second fan 13 and a second heat exchanger 15; the second static eliminating device 8 eliminates static charges carried by the pre-crystallized slicing granules, and inhibits the static adsorption effect on dust generated in the pre-crystallization process of the slices.
And a third rotary feeder 6 arranged on a discharge pipeline at the bottom of the crystallizer 3 can convey the slices after crystallization treatment to the next procedure to prepare final slice products.
Example 3
The basic slice designed in this example is sheet-like.
Aiming at the problem that the space between a buffer storage bin 1 and a pre-crystallizer in the existing polyester solid phase polycondensation device is limited or the basic slice carries dust.
The method comprises the following steps that a certain amount of dust is carried in basic slice aggregates in a cache bin 1, the basic slice aggregates stored in the cache bin 1 are conveyed to a pre-crystallizer 2 through a first static elimination device 7 and a first dust separator 16 by a first rotary feeder 4, the first static elimination device 7 adopts the existing bipolar ion wind static elimination technology, a static monitor with static electricity detects the static electricity of the basic slices and timely adjusts the electricity elimination parameters of an electricity eliminator, and the first static elimination device 7 adopts remote online detection and control; the static electricity eliminator adopts nitrogen as positive pressure protective gas, and the pressure of a wind source is 0.8 MPa.
The static charges carried by the basic slice granules are eliminated by the first static eliminating device 7, the static adsorption effect of the static on dust generated in the slice pre-crystallization process is inhibited, the static-eliminating treatment is carried out, the static-eliminating treatment enters the pre-crystallizer 2, and free moisture, impurities and dust in the basic slices can be removed in a reciprocating circulating air system constructed among the pre-crystallizer 2, the first gas purifying device 9, the first fan 12 and the first heat exchanger 14.
The material is conveyed into the crystallizer 3 from the crystallizer 3 by a second rotary feeder 5 through a second static electricity eliminating device 8 and a second dust separator 17, the second static electricity eliminating device 8 further carries out electricity eliminating treatment on the pre-crystallized basic slices, and free moisture, impurities and dust in the basic slices can be further removed in a reciprocating circulating air system constructed among the crystallizer 3, a second gas purifying device 10, a second fan 13 and a second heat exchanger 15; the second static eliminating device 8 eliminates static charges carried by the pre-crystallized slicing granules, and inhibits the static adsorption effect on dust generated in the pre-crystallization process of the slices.
And a third rotary feeder 6 arranged on a discharge pipeline at the bottom of the crystallizer 3 can convey the slices after crystallization treatment to the next procedure to prepare final slice products.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (13)
- A system for reducing content of ultrafine dust in a PET bottle grade polyester chip production process is characterized by comprising:the buffer storage bin is used for temporarily storing the normal-temperature basic slices;the pre-crystallizer is used for pre-crystallizing the basic slice particles subjected to primary static elimination and primary ultrafine dust desorption treatment;and the crystallizer is used for crystallizing the basic slice particles subjected to secondary static elimination and secondary ultrafine dust desorption treatment.
- 2. The system for reducing the content of ultrafine dust in the production process of PET bottle grade polyester chips as claimed in claim 1, wherein the bottom outlet of the buffer bin is connected with the top inlet of the pre-crystallizer, and a first rotary feeder, a first static elimination device and a first dust separator are installed on a conveying pipeline connecting the buffer bin and the pre-crystallizer, wherein the first static elimination device realizes one-time static elimination on the surface of the basic chip particles, and the first dust separator realizes one-time desorption treatment for adsorbing ultrafine dust.
- 3. The system for reducing the content of ultrafine dust in the production process of PET bottle grade polyester chips as claimed in claim 2, wherein the lateral outlet of the upper part of the pre-crystallizer is connected with the inlet of a first gas purification device, the outlet of the first gas purification device is connected with the lateral inlet of the lower part of the pre-crystallizer, and the first gas purification device realizes primary gas purification treatment, so that fine dust generated by the surging of basic chip particles under the action of a large amount of reciprocating circulating air can be removed at one time.
- 4. The system for reducing the content of ultrafine dust in the production process of PET bottle grade polyester chips as claimed in claim 3, wherein an electrostatic voltage probe is further installed in the pre-crystallizer, and is used for measuring and characterizing the static electricity generated by the PET basic chip particles due to boiling friction, and providing reference data for adjusting the electricity eliminating parameters of the first static electricity eliminating device.
- 5. The system for reducing the content of ultrafine dust in the production process of PET bottle grade polyester chips as claimed in claim 4, wherein the outlet at the bottom of the pre-crystallizer is communicated with the inlet of the crystallizer, and a second rotary feeder, a second static eliminating device and a second dust separator are installed on a conveying pipeline of the pre-crystallizer communicated with the crystallizer, wherein the second static eliminating device realizes secondary static elimination on the surface of the pre-crystallized chip granules, and the second dust separator realizes secondary desorption treatment of adsorbed ultrafine dust.
- 6. The system for reducing the content of ultrafine dust in the production process of PET bottle grade polyester chips as claimed in claim 5, wherein the outlet at the top of the crystallizer is connected with the inlet of a second gas purification device, the outlet of the second gas purification device is connected with the outlet at the lower part of the crystallizer, and the second gas purification device realizes secondary gas purification treatment, namely secondary removal of fine dust generated by the surging of basic chip particles under the action of a large amount of reciprocating circulating air.
- 7. The system for reducing content of ultrafine dust in the production process of PET bottle grade polyester chips as claimed in claim 5, wherein the first static elimination device and the second static elimination device comprise a static monitor, a static eliminator and a control system module.
- 8. The system for reducing content of ultrafine dust in production process of PET bottle grade polyester chip as claimed in claim 7, wherein the static monitor is installed at lower part of the static electricity eliminator for detecting slice electrification amount, providing feedback signal for the static electricity eliminator and adjusting the electricity eliminating capacity of the static electricity eliminator.
- 9. The system for reducing content of ultrafine dust in production process of PET bottle grade polyester chip as claimed in claim 8, wherein the electrostatic eliminator is a high voltage output module, the high voltage output module is installed in an explosion-proof junction box outside the electrostatic eliminator body, so that the electrostatic eliminator can bear the temperature of internal conveying medium exceeding 200 ℃ in operation.
- 10. The system for reducing the content of ultrafine dust in the production process of PET bottle grade polyester chips as claimed in claim 9, wherein the electrostatic charge remover adopts a positive pressure design and is externally connected with an instrument air source, and the pressure of the instrument air source subjected to purification treatment is not less than 0.6 MPa.
- 11. The system for reducing the content of ultrafine dust in the production process of PET bottle grade polyester chips as claimed in claim 3, wherein a first fan and a first heat exchanger are further arranged on a pipeline of the first gas purification device communicated with the pre-crystallizer, and the first gas purification device, the first fan and the first heat exchanger are all subjected to heat preservation treatment for ensuring the stability of the temperature of a large amount of reciprocating circulating air.
- 12. The system for reducing the content of ultrafine dust in the production process of PET bottle grade polyester chips as claimed in claim 6, wherein a second fan and a second heat exchanger are further arranged on a pipeline of the second gas purification device communicated with the crystallizer, and the second gas purification device, the second fan and the second heat exchanger are all subjected to heat preservation treatment for ensuring the stability of the temperature of a large amount of reciprocating circulating air.
- 13. The system for reducing the content of ultrafine dust in the production process of PET bottle grade polyester chips as claimed in claim 1, wherein the system further comprises a third gas purification device, and the third gas purification device is respectively connected with the first static elimination device and the second static elimination device through pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010465887.7A CN113730944A (en) | 2020-05-28 | 2020-05-28 | System for reducing content of ultrafine dust in production process of PET (polyethylene terephthalate) bottle grade polyester chips |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010465887.7A CN113730944A (en) | 2020-05-28 | 2020-05-28 | System for reducing content of ultrafine dust in production process of PET (polyethylene terephthalate) bottle grade polyester chips |
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| CN113730944A true CN113730944A (en) | 2021-12-03 |
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Application publication date: 20211203 |