CN217423786U - Waste heat recovery device for polyamide slices in cooling stage after high-temperature drying - Google Patents
Waste heat recovery device for polyamide slices in cooling stage after high-temperature drying Download PDFInfo
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- CN217423786U CN217423786U CN202221474544.8U CN202221474544U CN217423786U CN 217423786 U CN217423786 U CN 217423786U CN 202221474544 U CN202221474544 U CN 202221474544U CN 217423786 U CN217423786 U CN 217423786U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The utility model relates to a waste heat recovery device of polyamide section in cooling stage after high temperature drying, including drying tower and cooling storehouse, the upper end of drying tower is provided with the nitrogen gas thermal cycle spare that is used for carrying out the thermal cycle to nitrogen gas in the drying tower, the nitrogen gas delivery end of nitrogen gas thermal cycle spare and the tube side entry intercommunication setting of first heat exchanger, the tube side export of first heat exchanger and the tube side entry intercommunication setting of second heat exchanger, the tube side export of second heat exchanger and the lower extreme intercommunication setting of drying tower; the cooling bin is provided with a nitrogen cold circulation piece for performing cold circulation on nitrogen in the cooling bin, the nitrogen discharge end of the cooling bin is communicated with the shell pass inlet of the first heat exchanger, and the shell pass outlet of the first heat exchanger is communicated with the nitrogen input end of the nitrogen cold circulation piece. The utility model discloses a reduce the steam consumption of polyamide section production through waste heat recovery.
Description
Technical Field
The utility model relates to a polyamide polymerization processing technology field, especially a polyamide section is at the waste heat recovery device of cooling stage behind the high temperature drying.
Background
With the continuous development and expansion of caprolactam polymerization projects at home and abroad, the polyamide chip market is gradually contracted in recent years, and factories want to obtain survival and development in a severe competitive environment, so that the production cost is reduced by means of waste heat recovery, waste recycling and the like in addition to continuous improvement and optimization of product quality.
In the existing or conventional polyamide chip drying process, wet polyamide chips enter a drying tower to be dried through high-temperature nitrogen, the chips which are dried and have the temperature of about 115 ℃ enter a cooling bin and maintain a certain height of material level, the high-temperature nitrogen is discharged from the top of the cooling bin, the high-temperature hot nitrogen is cooled by cooling water through a shell-and-tube heat exchanger and then enters a nitrogen fan, a cold nitrogen source is continuously sent to the bottom of the cooling bin by the fan, continuous drying and cooling work are realized, cooling water heated by the hot nitrogen returns to the cooling tower, and waste heat is released to the nature by the cooling fan, so waste of the waste heat is caused, and the production cost is increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a polyamide section is at the waste heat recovery device of cooling stage behind the high temperature drying, can reduce the steam consumption of polyamide section production through waste heat recovery.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a polyamide section is at waste heat recovery device of cooling stage behind high temperature drying, includes drying tower and cooling bin, be provided with the section input tube on the drying tower, the section output of drying tower with the section input intercommunication setting in cooling bin, be provided with section output tube, its characterized in that on the cooling bin: the upper end of the drying tower is provided with a nitrogen thermal circulation piece for performing thermal circulation on nitrogen in the drying tower, the nitrogen conveying end of the nitrogen thermal circulation piece is communicated with the tube side inlet of the first heat exchanger, the tube side outlet of the first heat exchanger is communicated with the tube side inlet of the second heat exchanger, and the tube side outlet of the second heat exchanger is communicated with the lower end of the drying tower; the cooling bin is provided with a nitrogen cold circulation piece for performing cold circulation on nitrogen in the cooling bin, the nitrogen discharge end of the cooling bin is communicated with the shell pass inlet of the first heat exchanger, and the shell pass outlet of the first heat exchanger is communicated with the nitrogen input end of the nitrogen cold circulation piece.
Furthermore, a dehumidifying part is arranged between the nitrogen thermal circulation part and the first heat exchanger, a nitrogen conveying end of the nitrogen thermal circulation part is communicated with a nitrogen input end of the dehumidifying part, and a nitrogen output end of the dehumidifying part is communicated with a tube pass inlet of the first heat exchanger.
Further, the nitrogen gas thermal cycle piece includes first fan, third heat exchanger, the top of drying tower is provided with the nitrogen gas output, the nitrogen gas output with the air intake intercommunication setting of first fan, the air outlet of first fan respectively with the tube side entry of third heat exchanger the nitrogen gas input intercommunication setting of dehumidification piece, the tube side export of third heat exchanger with the upper end intercommunication setting of drying tower, the shell side entry of third heat exchanger is provided with first steam pipe, the shell side export of third heat exchanger is provided with first condensate pipe.
Further, the dehumidification piece includes nitrogen gas dehydrating unit, second fan, the air outlet of first fan with nitrogen gas dehydrating unit's nitrogen gas input intercommunication sets up, nitrogen gas dehydrating unit's nitrogen gas output with the air intake intercommunication of second fan sets up, the air outlet of second fan with the tube side entry intercommunication of first heat exchanger sets up.
Furthermore, the nitrogen cold circulation piece comprises a fourth heat exchanger and a third fan, a shell pass outlet of the first heat exchanger is communicated with a tube pass inlet of the fourth heat exchanger, a tube pass outlet of the fourth heat exchanger is communicated with an air inlet of the third fan, a shell pass inlet of the fourth heat exchanger is provided with a first cooling water pipe, a shell pass outlet of the fourth heat exchanger is provided with a second cooling water pipe, and an air outlet of the third fan is communicated with the lower end of the cooling bin.
Furthermore, a second steam pipe is arranged at a shell pass inlet of the second heat exchanger, and a second condensate pipe is arranged at a shell pass outlet of the second heat exchanger.
The utility model has the advantages that: the utility model discloses a steam consumption, reduction power consumption, reduction carbon emission, reduction in production cost that help reducing polyamide section production through waste heat recovery. The utility model discloses first heat exchanger has been added into the device, first heat exchanger is shell and tube type heat exchanger, high temperature nitrogen gas in the storehouse and the low temperature nitrogen gas in the drying tower that reduces the temperature because of drying wet polyamide section carry out the heat transfer through first heat exchanger, make the high temperature of high temperature nitrogen gas in the low temperature nitrogen gas absorption cooling storehouse, the temperature has certain promotion, thereby after nitrogen gas gets into the second heat exchanger from first heat exchanger, the second heat exchanger can reduce the input of high temperature steam, the high temperature nitrogen gas of cooling storehouse reduces the temperature because of having given the heat to the low temperature nitrogen gas in the drying tower simultaneously, the high temperature nitrogen gas of cooling storehouse gets into the fourth heat exchanger from first heat exchanger, because the temperature has reduced, so can reduce the input of the cooling water of fourth heat exchanger, reduce the consumption of cooling water; the dehumidifying part is added in the device, so that the nitrogen with moisture discharged from the drying tower can be dehumidified, and the drying efficiency of the polyamide chips by the nitrogen entering the drying tower again is not influenced.
Drawings
Fig. 1 is a schematic flow chart of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides an embodiment: a waste heat recovery device for polyamide chips in a cooling stage after high-temperature drying comprises a drying tower 1 and a cooling bin 2, wherein a chip input pipe 15 is arranged on the drying tower, a chip output end of the drying tower 1 is communicated with a chip input end of the cooling bin 2, a chip output pipe 16 is arranged on the cooling bin, a nitrogen thermal circulation piece 3 for performing thermal circulation on nitrogen in the drying tower 1 is arranged at the upper end of the drying tower 1, a nitrogen conveying end of the nitrogen thermal circulation piece 3 is communicated with a tube pass inlet of a first heat exchanger 4, a tube pass outlet of the first heat exchanger 4 is communicated with a tube pass inlet of a second heat exchanger 5, and a tube pass outlet of the second heat exchanger 5 is communicated with the lower end of the drying tower 1; the cooling bin 2 is provided with a nitrogen cold circulating part 6 used for performing cold circulation on nitrogen in the cooling bin 2, the nitrogen discharge end of the cooling bin 2 is communicated with the shell pass inlet of the first heat exchanger 4, and the shell pass outlet of the first heat exchanger 4 is communicated with the nitrogen input end of the nitrogen cold circulating part 6. The drying tower 1 is used for drying wet polyamide slices, the cooling bin 2 is used for cooling dried polyamide slices, the nitrogen thermal circulation piece 3 is used for heating nitrogen discharged from the drying tower 1 and then discharging the heated nitrogen into the drying tower 1 again to dry the polyamide slices, the first heat exchanger 4 is used for enabling low-temperature nitrogen passing through the drying tower 1 to pass through the tube pass of the first heat exchanger 4, meanwhile, high-temperature nitrogen discharged from the top of the cooling bin 2 passes through the shell side of the first heat exchanger 4, so that the temperature difference between nitrogen is utilized, heat exchange is carried out in the first heat exchanger 4 under the condition that two kinds of nitrogen are not contacted, on one hand, the temperature of the dry low-temperature nitrogen rises after being preheated by the heat exchange, thereby reducing the steam consumption of the second heat exchanger 5, and discharging low-temperature nitrogen with increased temperature into the lower end of the drying tower 1 for drying again; on the other hand, the temperature of hot nitrogen from the top of the cooling bin 2 is reduced after heat exchange and heat release, so that the consumption of cooling water of the fourth heat exchanger 7 is reduced; the second heat exchanger 5 is used for reheating the heated nitrogen in the first heat exchanger 4 and then discharging the reheated nitrogen into the lower end of the drying tower 1; the nitrogen cooling circulation piece 6 is used for cooling the hot nitrogen discharged from the cooling bin 2 and then discharging the hot nitrogen into the cooling bin 2 again to cool the polyamide chips again.
As shown in fig. 1, in an embodiment of the present invention, a dehumidifying element 8 is disposed between the nitrogen thermal circulation element 3 and the first heat exchanger 4, a nitrogen conveying end of the nitrogen thermal circulation element 3 is communicated with a nitrogen input end of the dehumidifying element 8, and a nitrogen output end of the dehumidifying element 8 is communicated with a tube pass inlet of the first heat exchanger 4. The dehumidifying part 8 is used for dehumidifying the nitrogen gas discharged after passing through the drying tower 1, thereby recycling the nitrogen gas.
Please continue to refer to fig. 1, in an embodiment of the present invention, the nitrogen thermal cycle part 3 includes a first fan 31 and a third heat exchanger 32, the top of the drying tower 1 is provided with a nitrogen output end, the nitrogen output end is connected to the air inlet of the first fan 31, the air outlet of the first fan 31 is connected to the tube side inlet of the third heat exchanger 32 and the nitrogen input end of the dehumidifying part 8, the tube side outlet of the third heat exchanger 32 is connected to the upper end of the drying tower 1, the shell side inlet of the third heat exchanger 32 is provided with a first steam pipe 9, and the shell side outlet of the third heat exchanger 32 is provided with a first condensate pipe 10. The first fan 31 is used for guiding nitrogen discharged from the drying tower 1 to the first heat exchanger 4 and the third heat exchanger 32, the third heat exchanger 32 is a shell-and-tube heat exchanger, high-temperature steam is added into a shell pass, heat of the high-temperature steam is conducted to the nitrogen in the tube pass, heat exchange is completed, and the heated nitrogen enters the drying tower 1 again.
Please refer to fig. 1, in an embodiment of the present invention, the dehumidifying part 8 includes a nitrogen dehumidifying apparatus 81 and a second fan 82, the air outlet of the first fan 31 is communicated with the nitrogen inlet and outlet of the nitrogen dehumidifying apparatus 81, the nitrogen outlet of the nitrogen dehumidifying apparatus 81 is communicated with the air inlet of the second fan 82, and the air outlet of the second fan 82 is communicated with the tube pass inlet of the first heat exchanger 4. The nitrogen gas dehumidifying device 81 is used for dehumidifying nitrogen gas, and the second fan 82 sends the dehumidified nitrogen gas to the tube side inlet of the first heat exchanger 4.
As shown in fig. 1, in an embodiment of the present invention, the nitrogen cooling circulation component 6 includes a fourth heat exchanger 7 and a third fan 61, the shell pass outlet of the first heat exchanger 4 is communicated with the tube pass inlet of the fourth heat exchanger 7, the tube pass outlet of the fourth heat exchanger 7 is communicated with the air inlet of the third fan 61, the shell pass inlet of the fourth heat exchanger 7 is provided with a first cooling water pipe 11, the shell pass outlet of the fourth heat exchanger 7 is provided with a second cooling water pipe 12, and the air outlet of the third fan 61 is communicated with the lower end of the cooling bin 2. The fourth heat exchanger 7 is a shell-and-tube heat exchanger, high-temperature nitrogen is conveyed in the tube pass of the fourth heat exchanger 7, and low-temperature cooling water is conveyed in the shell pass of the fourth heat exchanger 7, so that the high-temperature nitrogen is subjected to heat exchange and cooled, and the cooled nitrogen is discharged into the cooling bin 2 again through the third fan 61.
Referring to fig. 1, in an embodiment of the present invention, a second steam pipe 13 is disposed at a shell-side inlet of the second heat exchanger 5, and a second condensate pipe 14 is disposed at a shell-side outlet of the second heat exchanger 5. The second heat exchanger 5 is a shell-and-tube heat exchanger, and high-temperature steam is in the shell pass of the second heat exchanger 5 to reheat the nitrogen delivered from the first heat exchanger 4.
The utility model discloses the theory of operation below has: hot nitrogen discharged from the top of the drying tower 1 passes through the first fan 31, a part of the hot nitrogen enters the third heat exchanger 32, is heated by the third heat exchanger 32 and then is discharged to the upper end of the drying tower 1 to dry wet polyamide slices, the other part of the hot nitrogen is dehumidified by the nitrogen dehumidifier 81 and becomes nitrogen with extremely low water content and low temperature, the low temperature nitrogen passes through the tube pass of the first heat exchanger 4 by the second fan 82, meanwhile, high-temperature nitrogen discharged from the top of the cooling bin 2 passes through the shell side of the first heat exchanger 4, so that the temperature difference between nitrogen is utilized, heat exchange is carried out in the first heat exchanger 4 under the condition that two kinds of nitrogen are not contacted, on one hand, the temperature of the dry low-temperature nitrogen rises after being preheated by the heat exchange, thereby reducing the steam consumption of the second heat exchanger 5, and discharging low-temperature nitrogen with increased temperature into the lower end of the drying tower 1 for drying again; on the other hand, the temperature of the hot nitrogen from the top of the cooling bin 2 is reduced after heat exchange and heat release, so that the cooling water consumption of the fourth heat exchanger 7 is reduced, and the purpose of energy conservation is achieved.
The utility model provides a first heat exchanger, second heat exchanger, third heat exchanger, fourth heat exchanger, nitrogen gas dehydrating unit, first fan, second fan are prior art, and technical personnel in the field have can clearly understood, do not carry out the detailed description here.
The above description is only for the preferred embodiment of the present invention, and should not be interpreted as limiting the scope of the present invention, which is intended to cover all the equivalent changes and modifications made in accordance with the claims of the present invention.
Claims (6)
1. The utility model provides a polyamide section is at waste heat recovery device of cooling stage behind high temperature drying, includes drying tower and cooling bin, be provided with the section input tube on the drying tower, the section output of drying tower with the section input intercommunication setting in cooling bin, be provided with section output tube, its characterized in that on the cooling bin: the upper end of the drying tower is provided with a nitrogen thermal circulation piece for performing thermal circulation on nitrogen in the drying tower, the nitrogen conveying end of the nitrogen thermal circulation piece is communicated with the tube side inlet of the first heat exchanger, the tube side outlet of the first heat exchanger is communicated with the tube side inlet of the second heat exchanger, and the tube side outlet of the second heat exchanger is communicated with the lower end of the drying tower; the cooling bin is provided with a nitrogen cold circulation piece for performing cold circulation on nitrogen in the cooling bin, the nitrogen discharge end of the cooling bin is communicated with the shell pass inlet of the first heat exchanger, and the shell pass outlet of the first heat exchanger is communicated with the nitrogen input end of the nitrogen cold circulation piece.
2. The device for recovering the waste heat of the polyamide chips in the cooling stage after the polyamide chips are dried at the high temperature according to claim 1, wherein the device comprises: the nitrogen gas thermal cycle piece with be provided with the dehumidification piece between the first heat exchanger, the nitrogen gas delivery end of nitrogen gas thermal cycle piece with the nitrogen gas input intercommunication setting of dehumidification piece, the nitrogen gas output of dehumidification piece and the tube side entry intercommunication setting of first heat exchanger.
3. The device for recovering the waste heat of the polyamide chips in the cooling stage after the polyamide chips are dried at the high temperature according to claim 2, wherein: the nitrogen gas thermal cycle piece includes first fan, third heat exchanger, the top of drying tower is provided with the nitrogen gas output, the nitrogen gas output with the air intake intercommunication setting of first fan, the air outlet of first fan respectively with the tube side entry of third heat exchanger the nitrogen gas input intercommunication setting of dehumidification piece, the tube side export of third heat exchanger with the upper end intercommunication setting of drying tower, the shell side entry of third heat exchanger is provided with first steam pipe, the shell side export of third heat exchanger is provided with first condensate pipe.
4. The device for recovering the waste heat of the polyamide chips in the cooling stage after the polyamide chips are dried at the high temperature according to claim 3, wherein: the dehumidification piece includes nitrogen gas dehydrating unit, second fan, the air outlet of first fan with nitrogen gas dehydrating unit's nitrogen gas input intercommunication sets up, nitrogen gas dehydrating unit's nitrogen gas output with the air intake intercommunication of second fan sets up, the air outlet of second fan with the tube side entry intercommunication of first heat exchanger sets up.
5. The device for recovering the waste heat of the polyamide chips in the cooling stage after the polyamide chips are dried at the high temperature according to claim 2, wherein: the nitrogen cooling circulation piece comprises a fourth heat exchanger and a third fan, a shell side outlet of the first heat exchanger is communicated with a tube side inlet of the fourth heat exchanger, a tube side outlet of the fourth heat exchanger is communicated with an air inlet of the third fan, a shell side inlet of the fourth heat exchanger is provided with a first cooling water pipe, a shell side outlet of the fourth heat exchanger is provided with a second cooling water pipe, and an air outlet of the third fan is communicated with the lower end of the cooling bin.
6. The device for recovering the waste heat of the polyamide chips in the cooling stage after the polyamide chips are dried at the high temperature according to claim 2, wherein: and a second steam pipe is arranged at the shell pass inlet of the second heat exchanger, and a second condensate pipe is arranged at the shell pass outlet of the second heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221474544.8U CN217423786U (en) | 2022-06-13 | 2022-06-13 | Waste heat recovery device for polyamide slices in cooling stage after high-temperature drying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221474544.8U CN217423786U (en) | 2022-06-13 | 2022-06-13 | Waste heat recovery device for polyamide slices in cooling stage after high-temperature drying |
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| Publication Number | Publication Date |
|---|---|
| CN217423786U true CN217423786U (en) | 2022-09-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221474544.8U Active CN217423786U (en) | 2022-06-13 | 2022-06-13 | Waste heat recovery device for polyamide slices in cooling stage after high-temperature drying |
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| Country | Link |
|---|---|
| CN (1) | CN217423786U (en) |
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2022
- 2022-06-13 CN CN202221474544.8U patent/CN217423786U/en active Active
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