CN210773334U - Device and system for removing VOC (volatile organic compounds) in PE (polyethylene) slices - Google Patents
Device and system for removing VOC (volatile organic compounds) in PE (polyethylene) slices Download PDFInfo
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- CN210773334U CN210773334U CN201921884919.6U CN201921884919U CN210773334U CN 210773334 U CN210773334 U CN 210773334U CN 201921884919 U CN201921884919 U CN 201921884919U CN 210773334 U CN210773334 U CN 210773334U
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Abstract
The utility model relates to the technical field of rubber and plastic and chemical fiber production equipment, in particular to a device and a system for removing VOC in PE slices, wherein a first bag filter, a nitrogen cooler, a Roots blower, an adsorption device, a filter and a second electric heater are sequentially arranged between an air outlet arranged on a cyclone separator and an air inlet of a main dryer along the gas flow direction; the utility model discloses not only carry out efficient heat exchange, detach surface moisture and partial VOC to the PE section, dust and piece that produce when having still detached cutting grain in the PE section and in the transportation process have further guaranteed the stability of producing the product performance.
Description
Technical Field
The utility model relates to a rubber and plastic, chemical fiber production facility technical field, specificly relate to a device and system for getting rid of VOC in the PE section.
Background
The existing equipment is drum drying equipment, the equipment structure is complex, manual and intermittent operation is realized, the automation control degree is low, and the performance difference of each drum and each batch of the produced products is large; in addition, Volatile Organic Compound (VOC) impurities such as toluene and the like extracted by vacuumizing during the drying of Polyethylene (PE) slices cannot be recovered, so that the environmental pollution is large; in addition, the sealing is not easy to occur in the operation process, so that the PE slices are oxidized, and the product performance is influenced; the existing equipment can only be used for laboratory or small-scale production.
SUMMERY OF THE UTILITY MODEL
In view of the problem that exists in the above-mentioned technique, the utility model discloses a device and system for getting rid of VOC in PE section, the purpose can be to remaining VOC impurity such as toluene solvent in the PE section when polymerization get rid of and purify in the drying process.
In one aspect, the utility model provides a device for getting rid of VOC in PE section, it includes:
a slice conveying device;
the preheating device comprises a preheater and a cyclone separator, a first centrifugal fan and a first electric heater are sequentially arranged between an air outlet formed in the cyclone separator and an air inlet formed in the side face of the preheater, and a wet material inlet formed in the preheater is communicated with the slicing conveying device;
the top, bottom and bottom side edges of the main dryer are respectively and correspondingly provided with a feed inlet, a discharge outlet and an air inlet, and the feed inlet of the main dryer is communicated with the preheater; a first bag filter, a nitrogen cooler, a Roots blower, an adsorption device, a filter and a second electric heater are sequentially arranged between an air outlet arranged on the cyclone separator and an air inlet of the main dryer along the gas flowing direction;
and the slice output device is communicated with the discharge hole of the main dryer.
Further, section conveyor include the raw materials store the feed bin and with the wet section feed bin of feed bin intercommunication is stored to the raw materials, wet section feed bin with the pre-heater intercommunication, wet section feed bin with be provided with the rotary valve between the pre-heater.
Further, a second rotary valve conveyor is disposed between the raw material storage bin and the wet chip bin.
Furthermore, a second bag filter is communicated with the wet slicing bin, and the bottom of the second bag filter is communicated with a dust barrel.
Further, the slice output device comprises a crusher and a slice cooler communicated with the crusher, the crusher is communicated with the discharge hole of the main dryer, and the outlet end of the slice cooler is provided with a first rotary valve conveyor.
Furthermore, the adsorption device consists of an adsorption tower A, an adsorption tower B, a condenser, a second centrifugal fan and a third electric heater.
Further, a filter is arranged between the adsorption device and the second electric heater.
On the other hand, the utility model also provides a system for getting rid of VOC in the PE section, it includes the utility model provides an arbitrary a device for getting rid of VOC in the PE section.
The utility model discloses an actively the effect does: the PE slices form stable plug flow in the main dryer, so that the PE slices are ensured to be firstly-in and firstly-out in the main dryer, namely the PE slices are kept in the main reactor for consistent time, and the stability of the product performance can be ensured; the adsorption device for adsorbing VOC such as toluene and the like and the first bag type dust collector arranged in the bag type dust collector hardly cause pollution to the environment; the nitrogen is used as a drying medium, and the PE slices cannot be oxidized in the nitrogen, so that the product performance is effectively ensured; the nitrogen in the utility model is in closed cycle, only a little fresh nitrogen needs to be supplemented in the continuous production process, and the equipment operation cost is greatly reduced; the preheating device not only carries out high-efficiency heat exchange on the PE slices and removes surface moisture and part of VOC, but also removes dust and scraps generated in the process of grain cutting and conveying in the PE slices, and further ensures the stability of product performance. The system has simple equipment structure, and is a set of automatic control system with adjustable yield and capable of continuously and stably producing.
Drawings
The invention will now be described in connection with certain preferred embodiments with reference to the following illustrative figures. It is emphasized that the description herein is provided to enable those skilled in the art to make clear how the several forms of the invention may be embodied and practiced, and is not intended to be limited to the specific figures and embodiments shown.
Fig. 1 is a schematic view of the connection relationship of the present invention.
In the figure: a preheater 101, a rotary valve 102, a cyclone 103, a first centrifugal fan 104, a first electric heater 105;
a main dryer 201, a crusher 202;
a first bag filter 221, a first dust barrel 222, a nitrogen cooler 223, a Roots blower 224, an adsorption tower A225-A, an adsorption tower B225-B, a second centrifugal blower 225-1, a condenser 225-2, a third electric heater 225-3, a filter 226, and a second electric heater 227;
a slice cooler 301;
an ACU gas circuit control valve group I401, a first rotary valve conveyor 402;
a raw material storage bin 501, a second rotary valve conveyor 502, a valve block 503, an ACU gas circuit control valve block two 504 and a slice transport tanker 505;
a pipeline 601, an air supplement pipe 602;
wet chip silo 715, second bag filter 716, dust bin 717.
Detailed Description
Example (b): as shown in fig. 1, an apparatus and a system for removing VOCs from PE slices includes: a slice conveying device; it includes that raw materials stores feed bin 501 and the wet section feed bin 715 of export intercommunication through pipeline and raw materials storage feed bin 501, and the feed opening that is equipped with on the wet section feed bin 715 communicates with pre-heater 101, is provided with rotary valve 102 on the pipeline between wet section feed bin 715 and pre-heater 101.
A second rotary valve conveyor 502 is provided on the pipe between the raw material storage silo 501 and the wet slicer silo 715, and the raw material storage silo 501 is in communication with a moving slicer tanker through the pipe.
An air opening arranged on the side edge of the upper part of the wet slicing bin 715 is communicated with an inlet of a second bag filter 716, and the bottom of the second bag filter 716 is communicated with a dust barrel 717.
The preheating device comprises a preheater 101 and a cyclone separator 103, wherein a first centrifugal fan 104 and a first electric heater 105 are sequentially arranged on a pipeline between an air outlet arranged on the cyclone separator 103 and an air inlet arranged on the side surface of the preheater 101, and a wet material inlet arranged on the preheater 101 is communicated with a feed opening arranged on a wet slicing bin 715;
the top, the bottom and the side edge of the bottom of the main dryer 201 are respectively and correspondingly provided with a feed inlet, a discharge outlet and an air inlet, and the feed inlet of the main dryer 201 is communicated with a feed outlet arranged on the side edge of the bottom of the preheater 101; a first bag filter 221, a nitrogen cooler 223, a roots blower 224, an adsorption device, a filter 226 and a second electric heater 227 are sequentially arranged on a pipeline between the cyclone separator 103 and the first electric heater 105 or between an air outlet arranged on the cyclone separator 103 and an air inlet of the main dryer 101 along the gas flow direction;
an air inlet of the first bag filter 221 is communicated with a pipeline between the cyclone separator 103 and the first electric heater 105, an air outlet of the first bag filter 221 is communicated with an air inlet of the nitrogen cooler 223, an air outlet of the nitrogen cooler 223 is communicated with an air inlet of the Roots blower 224, an air outlet of the Roots blower 224 is communicated with an inlet end of an adsorption device, an outlet end of the adsorption device is communicated with an air inlet of the filter 226, an air outlet of the filter 226 is communicated with an air inlet of the second electric heater 227, and an air outlet of the second electric heater 227 is communicated with an air inlet of the main dryer 201, wherein the communicated filter 226 is used for removing dust possibly generated in the adsorption device, so that the outlet end of the adsorption device can also be directly communicated with the air inlet of the second electric heater 227 through a;
the gas enters the first bag filter 221, is filtered by filter bags in the first bag filter 221, then flows out from an air outlet of the first bag filter 221, enters an air inlet of the nitrogen cooler 223 through a pipeline, and flows out from an air outlet of the nitrogen cooler 223 after being subjected to partition wall heat exchange with cooling water in the nitrogen cooler, and then flows into an air inlet of the Roots blower 224 through a pipeline.
The nitrogen enters the inlet end of the adsorption device through a pipeline after being boosted by the Roots blower 224, the nitrogen enters the filter 226 through a pipeline after being adsorbed and purified by the adsorption device and then comes out from the outlet end of the adsorption device, the dust possibly generated in the adsorption device is removed, the nitrogen enters the electric heater 227 for temperature rise, and the clean nitrogen after temperature rise enters the main dryer 201 through a pipeline.
The adsorption device is composed of an adsorption tower A225-A, an adsorption tower B225-B, a condenser 225-2, a second centrifugal fan 225-1 and a third electric heater 225-3 which are communicated with a plurality of pneumatic valves through pipelines.
Specifically, the pneumatic valve 225.1 is communicated with the pneumatic valve 225.2 through a pipeline, the pneumatic valve 225.5 is communicated with the pneumatic valve 225.6, wherein after the pipeline communicated with the pneumatic valve 225.1 and the pneumatic valve 225.2 is communicated with the pipeline communicated with the pneumatic valve 225.5 and the pneumatic valve 225.6 in parallel, two ports of the pipeline are respectively communicated with the top port of the adsorption tower A225-A and the top port of the adsorption tower B225-B;
the pneumatic valve 225.7 is communicated with a pneumatic valve 225.8, the pneumatic valve 225.3 is communicated with a pneumatic valve 225.4, wherein two ports after the pipeline communicated with the pneumatic valve 225.7 and the pneumatic valve 225.8 is communicated with the pipeline communicated with the pneumatic valve 225.3 and the pneumatic valve 225.4 in parallel are respectively communicated with the bottom port of the adsorption tower A225-A and the bottom port of the adsorption tower B225-B,
which are communicated with each other through a pipeline, a pneumatic valve 225.9 and a pneumatic valve 225.10, a pneumatic valve 225.11 and a pneumatic valve 225.12, wherein a pipeline communicated with the pneumatic valve 225.9 and the pneumatic valve 225.10 is communicated with a pipeline communicated with the pneumatic valve 225.11 and the pneumatic valve 225.12 in parallel and then the ports thereof are respectively arranged on a pipeline between the pneumatic valve 225.5 and the pneumatic valve 225.6, a pipeline between the pneumatic valve 225.7 and the pneumatic valve 225.8, a third electric heater 225-3 is arranged on a pipeline between the pneumatic valve 225.12 and the pneumatic valve 225.8, wherein a pneumatic valve 225.12 is arranged on an air inlet pipeline of the third electric heater 225-3,
wherein the air inlet of the condenser 225-2 is arranged between the pipelines communicated with the pneumatic valve 225.9 and the pneumatic valve 225.10, the air outlet of the condenser 225-2 is communicated with the air inlet of the second centrifugal fan 225-1, the air outlet of the second centrifugal fan 225-1 is arranged between the pipelines communicated with the pneumatic valve 225.11 and the pneumatic valve 225.12, and the air supplement pipe 602 is communicated between the air outlet of the condenser 225-2 and the air inlet of the second centrifugal fan 225-1 and between the pipelines communicated with the pneumatic valve 225.1 and the pneumatic valve 225.2.
Wherein the inlet end of the adsorption device is arranged between the pipelines communicated with the pneumatic valve 225.1 and the pneumatic valve 225.2, the outlet end of the adsorption device is arranged between the pipelines communicated with the pneumatic valve 225.3 and the pneumatic valve 225.4,
and the slice output device is communicated with the discharge hole of the main dryer 201, the slice output device comprises a crusher 202 and a slice cooler 301 communicated with the discharge hole of the crusher 202, the feed hole on the crusher 202 is communicated with the discharge hole of the main dryer 201, and the outlet end of the slice cooler 301 is provided with a first rotary valve conveyor 402.
The utility model discloses it mainly operates the operation through PLC control system, and its process flow is: the PE slices are conveyed to a raw material storage bin 501 from a mobile slice tank truck, then conveyed to a wet slice bin 715 through a second rotary valve conveyor 502, and then conveyed to the preheater 101 through a rotary valve 102, the PE slices are subjected to uniform and efficient heat exchange with hot nitrogen in the preheater 101, so that the temperature of the PE slices is quickly raised to a drying process temperature, moisture, entrained dust and residual VOC in the PE slices are removed, the moisture, dust and VOC on the surfaces of the PE slices enter a first bag filter 221 along with the nitrogen, the moisture, dust and VOC enter a Roots blower 224 after being cooled to within 40 ℃ through a cooler 223 after dust removal, and the PE slices enter an adsorption device after being pressurized through the Roots blower 224,
when gas enters from the inlet end of the adsorption device, the process gas flow controlled by the adsorption device is as follows: the pneumatic valve 225.1 is opened, the pneumatic valve 225.3 is opened, the pneumatic valve 225.2 and the pneumatic valve 225.4 are in a closed state, the process gas passes through the adsorption tower A225-A and then goes out from the outlet end of the adsorption device and enters the filter 226, when the process gas passes through the adsorption tower A225-A, impurities such as VOC in the gas are adsorbed, so that the purpose of purifying VOC in the whole system is achieved, when the adsorption tower A225-A works, the adsorption tower B225-B is desorbed, at the moment, the pneumatic valve 225.12, the pneumatic valve 225.8, the pneumatic valve 225.6, the pneumatic valve 225.9 are in an open state, the pneumatic valve 225.11, the pneumatic valve 225.10, the pneumatic valve 225.5 and the pneumatic valve 225.7 are in a closed state, the second centrifugal fan 225-1 provides circulation, the gas in the pipeline enters the third electric heater 225-3 through the pneumatic valve 225.12, the kinetic energy is heated and then enters the adsorption tower B225-B through the pneumatic valve 225.8, the interior of the adsorption tower B225-B is heated, so that adsorbed impurities such as VOC are desorbed, then the adsorbed impurities enter the condenser 225-2 along with the air flow through the pneumatic valve 225.6 and the pneumatic valve 225.9, the hot gas in the condenser 225-2 is cooled by the chilled water, the temperature is reduced to 15 ℃ (below the dew point temperature), at the moment, the moisture and the impurities such as VOC in the gas are condensed out in a liquid form and are discharged through a discharge port of the condenser 225-2, at the moment, the gas is supplemented into an air inlet of the second centrifugal fan 225-1 through an air supplementing pipe, and therefore the volume difference of the gas in a regeneration gas path, which is generated due to the temperature change, is compensated. After the desorption of the adsorption tower B225-B is finished, the third electric heater 225-3 is closed, the second centrifugal fan 225-1 stops working after the gas cools the adsorption tower B225-B to about 25 ℃, at the moment, the adsorption tower B225-B finishes desorption and is in a standby state, when the working time of the adsorption tower A225-A is finished, the process gas is switched to the adsorption tower B225-B,
when the adsorption tower B225-B works, the pneumatic valve 225.2, the pneumatic valve 225.4 is opened, the pneumatic valve 225.1, the pneumatic valve 225.3 are in a closed state, the process gas passes through the adsorption tower B225-B and then flows out of the outlet end of the adsorption device to enter the filter 226, and simultaneously the adsorption tower A225-A is desorbed, at the same time, the pneumatic valve 225.12, the pneumatic valve 225.7, the pneumatic valve 225.5, the pneumatic valve 225.9 is in an open state, the pneumatic valve 225.11, the pneumatic valve 225.10, the pneumatic valve 225.6 and the pneumatic valve 225.8 are in a closed state, the second centrifugal fan 225-1 provides the circulating kinetic energy, the gas in the pipeline passes through the pneumatic valve 225.12 to enter the third electric heater 225-3, the gas after being heated enters the adsorption tower A225-A through the pneumatic valve 225.7, the interior of the adsorption tower A225-A is heated, so that the adsorbed impurities such as VOC are desorbed, and then the gas flows through the pneumatic valve 225.5 and the pneumatic valve 225.9 to enter the condenser, the hot gas in the condenser 225-2 is cooled by the chilled water, the temperature is reduced to 15 ℃ (below the dew point temperature), impurities such as moisture, VOC and the like in the gas are condensed out in a liquid state and are discharged through a discharge port of the condenser 225-2, and the gas is supplemented into a gas inlet of the second centrifugal fan 225-1 through a gas supplementing pipe 602, so that the volume difference of the gas in a regeneration gas path caused by the temperature change is made up. After the desorption of the adsorption tower A225-A is finished, the third electric heater 225-3 is closed, the gas cools the adsorption tower A225-A to about 25 ℃, then the second centrifugal fan 225-1 stops working, and at the moment, the adsorption tower A225-A finishes desorption and is in a standby state; the cycles are switched in sequence.
Wherein the purified nitrogen gas enters the main dryer 201 through the air inlet after being heated by the second electric heater 227, the PE slices enter the main dryer 201 through the feed inlet after being preheated by the preheater 101, the main dryer 201 is a counter-flow column-type tower dryer, the nitrogen gas flow distribution adopts a unique design, the uniform dispersion of the nitrogen gas is ensured, and the nitrogen gas and the PE slices can form stable piston flow in the main dryer 201, the nitrogen gas flow and the PE slices are subjected to uniform thermal contact in the main dryer 201 and form high-efficiency convection drying, the PE slices have no deviation of residence time in the main dryer 201, the short-circuit flow of the PE slices and the nitrogen gas cannot occur, so that the PE slices have an excellent residence time in the main dryer 201, and the optimal product quality is ensured. The dried hot nitrogen flows in the reverse direction of the PE slices to further remove impurities such as moisture, VOC and the like in the PE slices, the dried PE slices enter a slice cooler 301 through a crusher 202 for cooling, and the cooled PE slices are conveyed to a finished product storage bin or a material using point for direct use.
The nitrogen circulation of the whole system is a closed loop, and nitrogen containing moisture and VOC impurities from the main dryer 201 is reused after being purified by dust removal, adsorption and the like. VOC impurities such as toluene and the like are adsorbed by adopting an activated carbon or molecular sieve adsorption mode, and are heated, desorbed and regenerated after adsorption saturation. In the desorption process, VOC impurities such as water, methylbenzene and the like are automatically discharged into a methylbenzene recovery tank arranged outside. The system adopts nitrogen as a drying medium, ensures that the gas containing toluene is not in the explosion limit, adopts systematic explosion-proof design and safety node monitoring, and ensures the safe operation of the device. The system is a closed circulating system, and a small amount of fresh nitrogen can be automatically supplemented to keep the pressure of the system constant, so that the nitrogen loss of the whole system is very low. The slice cooler is a vertical shell and tube heat exchanger of a special design, and the tube side is walked to the slice, and the shell side is walked to the refrigerated water, and special structural design guarantees that the slice is even to get into every heat exchange tube from the top tube sheet, can not produce the dead angle on the top tube sheet surface and cause the PE section to pile up and influence the fluctuation of product quality.
Although the invention has been described with reference to preferred embodiments, it will be understood by those skilled in the art that various modifications and changes may be made to the invention without departing from the scope of the invention.
Claims (8)
1. An apparatus for removing VOCs from PE slices, comprising:
a slice conveying device;
the preheating device comprises a preheater and a cyclone separator, a first centrifugal fan and a first electric heater are sequentially arranged between an air outlet formed in the cyclone separator and an air inlet formed in the side face of the preheater, and a wet material inlet formed in the preheater is communicated with the slice conveying device;
the top, bottom and bottom side edges of the main dryer are respectively and correspondingly provided with a feed inlet, a discharge outlet and an air inlet, and the feed inlet of the main dryer is communicated with the preheater; a first bag filter, a nitrogen cooler, a Roots blower, an adsorption device and a second electric heater are sequentially arranged between an air outlet arranged on the cyclone separator and an air inlet of the main dryer along the gas flowing direction;
and the slice output device is communicated with the discharge hole of the main dryer.
2. The apparatus according to claim 1, wherein the apparatus comprises: the slice conveying device comprises a raw material storage bin and a wet slice bin communicated with the raw material storage bin, the wet slice bin is communicated with the preheater, and a rotary valve is arranged between the wet slice bin and the preheater.
3. The apparatus for removing VOC from PE slices as claimed in claim 2, wherein: a second rotary valve conveyor is disposed between the raw material storage bin and the wet slicer bin.
4. The apparatus for removing VOC from PE slices as claimed in claim 2, wherein: and the wet slicing bin is communicated with a second bag filter, and the bottom of the second bag filter is communicated with a dust barrel.
5. The apparatus according to claim 1, wherein the apparatus comprises: the slice output device comprises a crusher and a slice cooler communicated with the crusher, the crusher is communicated with a discharge hole of the main dryer, and a first rotary valve conveyor is arranged at the outlet end of the slice cooler.
6. The apparatus according to claim 1, wherein the apparatus comprises: the adsorption device consists of an adsorption tower A, an adsorption tower B, a condenser, a second centrifugal fan and a third electric heater.
7. The apparatus according to claim 1, wherein the apparatus comprises: and a filter is arranged between the adsorption device and the second electric heater.
8. A system for removing VOCs from PE slices, comprising: at least one device for removing VOCs from PE slices as claimed in any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921884919.6U CN210773334U (en) | 2019-11-01 | 2019-11-01 | Device and system for removing VOC (volatile organic compounds) in PE (polyethylene) slices |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921884919.6U CN210773334U (en) | 2019-11-01 | 2019-11-01 | Device and system for removing VOC (volatile organic compounds) in PE (polyethylene) slices |
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| CN210773334U true CN210773334U (en) | 2020-06-16 |
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| CN201921884919.6U Active CN210773334U (en) | 2019-11-01 | 2019-11-01 | Device and system for removing VOC (volatile organic compounds) in PE (polyethylene) slices |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113577975A (en) * | 2021-08-02 | 2021-11-02 | 鸿灌环境技术有限公司 | Organic pollutant waste gas treatment method in ectopic indirect thermal desorption process |
| CN113912754A (en) * | 2020-07-09 | 2022-01-11 | 中国石油化工股份有限公司 | Technical combination method for removing VOCs and odor from polyolefin resin |
-
2019
- 2019-11-01 CN CN201921884919.6U patent/CN210773334U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113912754A (en) * | 2020-07-09 | 2022-01-11 | 中国石油化工股份有限公司 | Technical combination method for removing VOCs and odor from polyolefin resin |
| CN113577975A (en) * | 2021-08-02 | 2021-11-02 | 鸿灌环境技术有限公司 | Organic pollutant waste gas treatment method in ectopic indirect thermal desorption process |
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