CN215427390U - Polymer polyol tail gas recovery condensing tower - Google Patents
Polymer polyol tail gas recovery condensing tower Download PDFInfo
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- CN215427390U CN215427390U CN202121905500.1U CN202121905500U CN215427390U CN 215427390 U CN215427390 U CN 215427390U CN 202121905500 U CN202121905500 U CN 202121905500U CN 215427390 U CN215427390 U CN 215427390U
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Abstract
The utility model relates to the technical field of polymer polyol tail gas recovery, in particular to a polymer polyol tail gas recovery condensing tower. The polymer polyol tail gas recovery condensing tower comprises a tower body, a tail gas inlet arranged on the side surface of the lower end of the tower body and a tail gas outlet arranged at the top of the tower body, wherein the tower bottom comprises a liquid recovery layer, a first cooling layer, a second cooling layer and a defoaming layer which are sequentially distributed from bottom to top; the two-section cooling layer is internally provided with two sections of heat exchange tubes, the two sections of heat exchange tubes are internally filled with fillers, and the shell of the two-section cooling layer is provided with a low-temperature cooling liquid inlet and a low-temperature cooling liquid outlet. The condensing tower adopts two-section two-stage cooling, reduces the consumption of cooling liquid, improves the cooling efficiency and the removal rate of residual monomers in tail gas, can recycle and reuse condensed liquid after being recovered, and reduces the material consumption.
Description
Technical Field
The utility model relates to the technical field of polymer polyol tail gas recovery, in particular to a polymer polyol tail gas recovery condensing tower.
Background
The polymer polyol (POP) is prepared by modifying polyether polyol, styrene/acrylonitrile and other vinyl polymerization monomers are introduced into the polyether polyol, and special polyether dispersant is used for stabilizing polymer particles, so that the polymer polyol is mainly used for producing soft foam polyurethane, and the bearing capacity, resilience and cell structure of a product can be obviously improved. Because of its excellent performance, it is widely used in automobiles, furniture, mattresses, etc.
The grafting monomers added in the POP production process comprise styrene and acrylonitrile, about 3 percent of the monomers do not participate in the reaction in the polymerization process, and the monomers need to be removed in the demonomerization process. At present, the monomer is removed by rapid vaporization in a vacuum state by adopting a flash evaporation technology, the removed monomer enters a cooler to be condensed and recycled and then enters a vacuum pump, uncondensed gas is conveyed to a water washing tower through an exhaust pipeline, and the uncondensed gas enters a tail gas system of a device to be incinerated after being washed by the water washing tower.
Because the uncondensed gas still contains the monomer with a certain concentration, the residual monomer is easy to condense in the pipeline to self-polymerize and block the pipeline in the long-distance pipeline transportation process; and the waste water COD that the washing tower washed is high, the waste water volume is big, and the residual monomer also easily takes place the auto-agglutination in the waste water treatment pond, causes and handles degree of difficulty and cost increase, directly wash as waste water treatment with the residual monomer in addition, also causes partial material to run off.
SUMMERY OF THE UTILITY MODEL
The technical problem solved by the utility model is as follows: the utility model provides a polymer polyol tail gas recovery condensing tower adopts two-stage type secondary cooling, has reduced the quantity of coolant liquid, has improved cooling efficiency and the clearance of remaining monomer in the tail gas, and the condensate can be circulated after retrieving and apply mechanically, has reduced the material consumption.
The polymer polyol tail gas recovery condensing tower comprises a tower body, a tail gas inlet arranged on the side surface of the lower end of the tower body and a tail gas outlet arranged at the top of the tower body, wherein the tower bottom comprises a liquid recovery layer, a first cooling layer, a second cooling layer and a defoaming layer which are sequentially distributed from bottom to top; the two-section cooling layer is internally provided with two sections of heat exchange tubes, the two sections of heat exchange tubes are internally filled with fillers, and the shell of the two-section cooling layer is provided with a low-temperature cooling liquid inlet and a low-temperature cooling liquid outlet.
The tail gas recycling device comprises a tower body, a tail gas inlet, a tail gas recovery layer, a liquid recovery layer, a defoaming layer, a tail gas inlet, a shell pass, a cooling liquid inlet, a liquid outlet, a tail gas inlet, a tail gas outlet, a tail gas inlet, a tail gas outlet, a tail gas inlet, a tail gas outlet, a tail gas inlet, a tail gas outlet, a tail gas inlet, and a tail gas outlet.
Adopt two-stage form cooling can make the residual monomer in the tail gas get rid of more thoroughly, and the circulating water of one of them section cooling layer adopts 20-30 ℃ of normal atmospheric temperature water, carries out preliminary condensation to the residual monomer in the tail gas, and the coolant temperature of two-stage section cooling layer is less than-10 ℃, further condenses the residual monomer, and two-stage section heat exchange tube intussuseption is filled with the filler, plays the vortex effect, prolongs the dwell time of tail gas in two-stage section heat exchange tube, improves cooling efficiency and residual monomer's clearance.
When selecting the heat exchange tube, one section of the heat exchange tube can adopt the heat exchange tube with the conventional size specification, and the size specification is preferably as follows: the outer diameter is 15-38mm, and the wall thickness is 1-2.5 mm; for example, heat exchange tubes with a size of phi 15mm x 1mm, phi 19mm x 2mm, phi 25mm x 2mm, phi 38mm x 2.5mm, etc., are most preferred.
The inner diameter of the second-section heat exchange tube is larger than that of the first-section heat exchange tube, and the preferred size is phi 89mm x 2 mm. The large-size heat exchange tube is selected to facilitate filling of the filler, so that the residence time of the tail gas in the tube is prolonged.
Preferably, the filler filled in the two-stage heat exchange tube is a pall ring, the material of the pall ring is not limited, and the size specification is smaller than the inner diameter of the two-stage heat exchange tube, and the most preferable is a phi 50 pall ring.
And after condensing residual monomers in the tail gas, allowing the condensed residual monomers to enter a liquid recovery layer at the lowest end of the tower bottom, wherein a jacket is arranged outside the liquid recovery layer for preventing the residual monomers from self-polymerization, a jacket cooling liquid inlet and a jacket cooling liquid outlet are arranged on the jacket, and the temperature of the jacket cooling liquid is lower than-5 ℃ so that the condensed liquid is kept at a lower temperature.
The bottom of the liquid recovery layer is provided with a liquid discharge port, and when the liquid recovery layer reaches a certain liquid level, the liquid is discharged through the liquid discharge port and sent into a batching system for cyclic application, so that the recycling is realized, and the materials are saved. The tap hole can adopt automatic interlocking control, and when the liquid level reaches a set value, the automatic interlocking starts the discharge valve and the delivery pump to deliver the condensate, so that automatic control is realized.
Get into the demister by the top of two-stage heat exchange tube after getting rid of the tail gas of remaining monomer, the demister is equipped with the silk screen demister inside, gets rid of the condensation liquid drop of smuggleing secretly in the gas, then discharges from the tail gas outlet at tower body top, and the entering device tail gas system burns the processing.
The working principle of the polymer polyol tail gas recovery condensing tower is as follows:
tail gas with the temperature of 85-90 ℃ enters a condensing tower from a tail gas inlet on the side surface of the lower end of the tower bottom, two-section type two-stage cooling is adopted, the tail gas firstly enters a section of heat exchange tube of a cooling layer, the tube side is the tail gas, the shell side is normal-temperature circulating water with the temperature of 20-30 ℃, and the tail gas is pre-cooled; then entering a second-stage heat exchange tube of a second-stage cooling layer, wherein the tube side is tail gas, the shell side is cooling liquid below minus 10 ℃, the second-stage heat exchange tube is filled with a filler, the residence time of the tail gas in the second-stage heat exchange tube is prolonged by turbulent flow, and residual monomers are further condensed; the tail gas after secondary cooling enters a defoaming layer, entrained condensed liquid drops are removed through a wire mesh demister, and then the condensed liquid drops are discharged from a tail gas outlet at the top of the tower body and enter a tail gas system of the device for incineration disposal; residual monomers in tail gas enter the liquid recovery layer after being condensed, the residual monomers are prevented from self-polymerizing under the cooling of the jacket circulating cooling liquid, and when the liquid recovery layer reaches a certain liquid level, the residual monomers are discharged through the liquid discharge port and sent into the batching system for circulating application, so that the recycling is realized, and the materials are saved.
Compared with the prior art, the utility model has the following beneficial effects:
(1) compared with the traditional single-tube pass cooling, the polymer polyol tail gas recovery condensing tower adopts two-section two-stage cooling, reduces the consumption of cooling liquid and reduces the consumption of cooling liquid by pre-cooling the first-section heat exchange tubeThe energy consumption is low, the filling filler of the second-stage heat exchange tube plays a role in turbulence, the retention time of the tail gas in the second-stage heat exchange tube is prolonged, the cooling efficiency is improved, the removal rate of residual monomers in the tail gas is improved, and the concentration of the residual monomers in the tail gas is 1500mg/m3The concentration is reduced to 30mg/m3The problems of tail gas conveying pipeline liquid accumulation and monomer self-polymerization blockage of the pipeline caused by overhigh tail gas monomer concentration are solved;
(2) the condensate treated by the condensing tower can be recycled, so that the material consumption is reduced, the product yield is improved, and is improved to 99% from 98.5% before modification;
(3) the polymer polyol tail gas recovery condensing tower provided by the utility model does not adopt a water washing mode, realizes zero wastewater discharge, and is beneficial to environment-friendly production.
Drawings
FIG. 1 is a schematic view of a polymer polyol tail gas recovery condensing column according to the present invention;
in the figure: 1. a tail gas outlet; 2. a wire mesh demister; 3. a defoaming layer; 4. a low-temperature cooling liquid outlet; 5. a second cooling layer; 6. a second section of heat exchange tube; 7. a filler; 8. a cryogenic coolant inlet; 9. a circulating water outlet; 10. a first cooling layer; 11. a section of heat exchange tube; 12. a circulating water inlet; 13. a jacket cooling fluid outlet; 14. a tail gas inlet; 15. a liquid recovery layer; 16. a jacket; 17. a jacket cooling fluid inlet; 18. a liquid discharging port.
Detailed Description
The present invention is further illustrated by the following examples, but the scope of the present invention is not limited thereto.
Example 1
As shown in fig. 1, a polymer polyol tail gas recovery condensing tower comprises a tower body, a tail gas inlet 14 arranged on the side surface of the lower end of the tower body and a tail gas outlet 1 arranged at the top of the tower body, wherein the tower bottom comprises a liquid recovery layer 15, a first cooling layer 10, a second cooling layer 5 and a defoaming layer 3 which are sequentially distributed from bottom to top, a section of heat exchange pipe 11 is arranged in the first cooling layer 10, and a shell of the first cooling layer 10 is provided with a circulating water inlet 12 and a circulating water outlet 9; two-stage heat exchange tube 6 is equipped with to two-stage cooling layer 5 inside, and two-stage heat exchange tube 6 is inside to be filled with filler 7, and the casing of two-stage cooling layer 5 is equipped with cryogenic cooling liquid import 8 and cryogenic cooling liquid export 4.
Wherein, the tube side of one section heat exchange tube 11 and two-stage heat exchange tube 6 is tail gas, the shell side is the coolant liquid, the tube side of one section heat exchange tube 11 and two-stage heat exchange tube 6 communicates with each other, polymer polyol tail gas gets into the tower from tail gas import 1, get into one section heat exchange tube 11 and two-stage heat exchange tube 6 in proper order and cool off, residual monomer in the tail gas gets into liquid recovery layer 15 after condensing, the tail gas of detaching residual monomer gets rid of residual condensate drop through defoaming layer 3, discharge from the tail gas export 1 at tower body top, the entering device tail gas system burns the processing.
Adopt two-stage form cooling can make the residual monomer in the tail gas get rid of more thoroughly, and the circulating water of one section cooling layer 10 adopts 20-30 ℃ of normal atmospheric temperature water, carries out the preliminary condensation to the residual monomer in the tail gas, and the coolant temperature of two-stage cooling layer 5 is less than-10 ℃, further condenses the residual monomer, and two-stage heat exchange tube 6 intussuseption is filled with the filler, plays the vortex effect, prolongs the dwell time of tail gas in two-stage heat exchange tube 6, improves cooling efficiency and residual monomer's clearance.
When selecting the heat exchange tube, one section of the heat exchange tube 11 adopts a heat exchange tube with the dimension specification of phi 25mm x 2mm, and the two section of the heat exchange tube 6 adopts a heat exchange tube with the dimension specification of phi 89mm x 2 mm. The filler 7 filled in the two-section heat exchange tube 6 is a phi 50 pall ring, and the material of the pall ring is not limited.
And after condensing residual monomers in the tail gas, the condensed residual monomers enter a liquid recovery layer 15 at the lowest end of the tower bottom, in order to prevent the residual monomers from self-polymerization, a jacket 16 is arranged outside the liquid recovery layer 15, a jacket cooling liquid inlet 17 and a jacket cooling liquid outlet 13 are arranged on the jacket, the temperature of the jacket cooling liquid is lower than-5 ℃, and the condensate is kept at a lower temperature.
The bottom of the liquid recovery layer 15 is provided with a liquid discharge port 18, and when the liquid recovery layer 15 reaches a certain liquid level, the liquid is discharged through the liquid discharge port 18 and sent into a batching system for recycling, so that the recycling is realized, and the materials are saved.
Get into demister layer 3 by the top of two-stage heat exchange tube 6 after getting rid of the tail gas of remaining monomer, demister layer 3 inside is equipped with silk screen demister 2, gets rid of the condensation liquid drop of smuggleing secretly in the gas, then from the tail gas export 1 discharge at tower body top, the entering device tail gas system burns and deals with.
The working principle of the polymer polyol tail gas recovery condensing tower is as follows:
tail gas with the temperature of 85-90 ℃ enters a condensing tower from a tail gas inlet 14 on the side surface of the lower end of the tower bottom, two-section type two-stage cooling is adopted, the tail gas firstly enters a section of heat exchange tube 11 of a section of cooling layer 10, the tube side is the tail gas, the shell side is normal-temperature circulating water with the temperature of 20-30 ℃, and the tail gas is pre-cooled; then the tail gas enters a second-section heat exchange tube 6 of a second-section cooling layer 5, the tube side is tail gas, the shell side is cooling liquid below minus 10 ℃, a filler 7 is filled in the second-section heat exchange tube 6, the retention time of the tail gas in the second-section heat exchange tube 6 is prolonged through turbulent flow, and residual monomers are further condensed; the tail gas after secondary cooling enters a defoaming layer 3, entrained condensed liquid drops are removed through a wire mesh demister 2, and then the condensed liquid drops are discharged from a tail gas outlet 1 at the top of the tower body and enter a tail gas system of the device for incineration disposal; residual monomers in tail gas enter the liquid recovery layer 15 after being condensed, the residual monomers are prevented from self-polymerization under the cooling of circulating cooling liquid of the jacket 16, and when the liquid recovery layer 15 reaches a certain liquid level, the residual monomers are discharged through the liquid discharge port 18 and sent into the batching system for circulating application, so that the recycling is realized, and materials are saved.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a condensation column is retrieved to polymer polyol tail gas, includes the tower body, sets up tail gas import (14) and the tail gas export (1) of setting at the tower body top of tower body lower extreme side, its characterized in that: the tower bottom comprises a liquid recovery layer (15), a first section of cooling layer (10), a second section of cooling layer (5) and a defoaming layer (3) which are sequentially distributed from bottom to top, a section of heat exchange pipe (11) is arranged inside the first section of cooling layer (10), and a shell of the first section of cooling layer (10) is provided with a circulating water inlet (12) and a circulating water outlet (9); two-section heat exchange tube (6) is equipped with in two-section cooling layer (5) inside, and two-section heat exchange tube (6) inside is filled with filler (7), and the shell of two-section cooling layer (5) is equipped with cryogenic cooling liquid import (8) and cryogenic cooling liquid export (4).
2. The polymer polyol tail gas recovery and condensation column of claim 1, wherein: the size specification of a section of heat exchange tube (11) is as follows: the outer diameter is 15-38mm, and the wall thickness is 1-2.5 mm.
3. The polymer polyol tail gas recovery and condensation column of claim 1, wherein: the two-stage heat exchange tube (6) has the size specification of phi 89mm x 2 mm.
4. The polymer polyol tail gas recovery and condensation column according to claim 1 or 3, wherein: the packing (7) filled in the two-section heat exchange tube (6) is a pall ring.
5. The polymer polyol tail gas recovery and condensation column of claim 1, wherein: a jacket (16) is arranged outside the liquid recovery layer (15), and a jacket cooling liquid inlet (17) and a jacket cooling liquid outlet (13) are arranged on the jacket.
6. The polymer polyol tail gas recovery and condensation column of claim 1, wherein: the bottom of the liquid recovery layer (15) is provided with a liquid discharging port (18).
7. The polymer polyol tail gas recovery and condensation column of claim 1, wherein: the inside of the defoaming layer (3) is provided with a wire mesh demister (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121905500.1U CN215427390U (en) | 2021-08-13 | 2021-08-13 | Polymer polyol tail gas recovery condensing tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121905500.1U CN215427390U (en) | 2021-08-13 | 2021-08-13 | Polymer polyol tail gas recovery condensing tower |
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| Publication Number | Publication Date |
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| CN215427390U true CN215427390U (en) | 2022-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121905500.1U Active CN215427390U (en) | 2021-08-13 | 2021-08-13 | Polymer polyol tail gas recovery condensing tower |
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2021
- 2021-08-13 CN CN202121905500.1U patent/CN215427390U/en active Active
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