CN219398987U - Circulating heating structure of acetaldehyde tower - Google Patents
Circulating heating structure of acetaldehyde tower Download PDFInfo
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- CN219398987U CN219398987U CN202223109576.0U CN202223109576U CN219398987U CN 219398987 U CN219398987 U CN 219398987U CN 202223109576 U CN202223109576 U CN 202223109576U CN 219398987 U CN219398987 U CN 219398987U
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- acetaldehyde
- reboiler
- rectifying tower
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Abstract
The utility model discloses an acetaldehyde tower circulating heating structure, which comprises a wastewater collection tank, a condensate delivery pump and an acetaldehyde rectifying tower, wherein a reboiler is arranged between the condensate delivery pump and the acetaldehyde rectifying tower, a heating medium outlet and a cooling medium liquid outlet are arranged at the top of the reboiler, a heating medium inlet and a cooling medium liquid inlet are arranged at the lower part of the reboiler, a circulating mechanism is further arranged between the acetaldehyde rectifying tower and the cooling medium liquid inlet, liquid in the acetaldehyde rectifying tower can be circularly heated in the reboiler after being output again through the circulating mechanism, so that the liquid is effectively heated and then is secondarily heated in the acetaldehyde tower to be effectively decomposed and extracted. The method can effectively reduce the residue of low boiling point substances in the wastewater, increase the extraction quantity of the low boiling point substances in the device, and ensure the safe and stable operation of the whole device, thereby improving the quality and yield of products, further improving the economic efficiency and maintaining the production stability.
Description
Technical Field
The utility model relates to the technical field of polyester production equipment, in particular to an acetaldehyde tower circulating heating structure.
Background
The continuous development of the current industrial technology gradually attracts the eyeballs of people for the extractable substances in various chemical enterprises, and the actual realization of changing waste into valuable is realized from the original assumption; meanwhile, under the large situation that environmental protection requirements tend to be strict, the economic investment cost for treating chemical wastewater is increased year by year, and the standard of standard emission is refreshed frequently. In order to further improve the yield of acetaldehyde and glycol in the wastewater, and simultaneously reduce the impact on a sewage system and lower investment cost in the wastewater treatment process. The prior process structure is changed in the decomposition treatment link of the process wastewater, and the acetaldehyde and 2-MD values in the effluent tower wastewater are reduced in a thousand times and hundred times; increasing acetaldehyde production and maintaining acetaldehyde column system stability are urgent efforts to our face.
The device recovers the stripping tail gas generated by stripping pretreatment of polyester esterification wastewater, cools the polyester esterification wastewater into condensate, then enters a wastewater collection tank, pumps the condensate into an acetaldehyde rectifying tower, and obtains acetaldehyde from the top of the acetaldehyde tower through steam decomposition and rectification. And then the waste water is condensed and sequentially flows back to the tank, the middle tank and the acetaldehyde storage tank, as described in a method for recycling glycol and acetaldehyde from polyester waste water in patent 201710720292. X. As the device runs down, the stability of the acetaldehyde tower system is poor, and the product quality and the product yield have a certain gap compared with brother enterprises. Aiming at the problems, the research countermeasure needs to be invented, so that the current situation can be improved by obviously improving the stability of an acetaldehyde system, the quality and the yield of products, the economic efficiency is further improved, and the production stability is maintained.
After the exposure of this problem we first analyze the main problems specifically listed below:
1. the low output of the acetaldehyde tower shows that the content of acetaldehyde/2-MD in the wastewater of the tower is obviously higher, so that the acetaldehyde output is not proportional to the polyester productivity, the increase of the reflux quantity of the wastewater is not aggravated, the running load of the existing acetaldehyde tower is frosted on snow, and the flooding accident is extremely easy to occur. Preliminary statistics show that tower flooding caused by open reflux can occur 2-3 times per month.
2. The extraction amount of the acetaldehyde is closely related to the proportion of heating steam, and the increase of the steam consumption can cause the phenomenon of pressure holding caused by improper steam proportion, and the steam at the bottom part of the tower is easy to be sucked into a pump to generate cavitation; the temperature of the tower bottom 0197 drops sharply to enable the phenomenon of the liquid level to rise abnormally to submerge the tower, at the moment, things adhered above the liquid sac are easily fallen and brought into the suction inlet of the pump to affect the suction quantity of the pump, when the pump is added, the liquid level of the acetaldehyde tower can be ensured only by draining water of the filter, the on-site peculiar smell is caused to seriously pollute the environment, and meanwhile, the unsafe factor is increased.
3. The quality of the product depends on stable control of the temperature of the top of the acetaldehyde tower, the steam proportioning amount of the acetaldehyde tower plays a key role on 0149 temperature change, the purity of the acetaldehyde is directly influenced by the temperature change, the advantage of the sales link is caused, and the economic benefit of enterprises is influenced to a certain extent.
Disclosure of Invention
In order to solve certain or certain technical problems existing in the prior art, the purpose of the application is to provide an acetaldehyde tower circulating heating structure, which can effectively reduce the residue of low boiling point substances in wastewater, increase the extraction quantity of the low boiling point substances in the device, and ensure the safe and stable operation of the whole device, thereby improving the product quality and yield, further improving the economic efficiency and the maintenance production stability, and really achieving the aims of energy conservation, emission reduction, cost reduction and synergy.
In order to solve the above-mentioned existing technical problem, this application adopts following technical scheme to realize:
the utility model provides an acetaldehyde tower circulation heating structure, includes waste water collection tank, condensate delivery pump, acetaldehyde rectifying column, the condensate delivery pump with be equipped with the reboiler between the acetaldehyde rectifying column, the top of reboiler is equipped with heating medium export and cold medium liquid export, and the lower part is equipped with heating medium import and cold medium liquid import, the delivery port of condensate delivery pump with cold medium liquid access connection, the reboiler passes through cold medium liquid export with the acetaldehyde rectifying column is connected, the acetaldehyde rectifying column with still be equipped with circulation mechanism between the cold medium liquid import, pass through between the acetaldehyde rectifying column with circulation mechanism with form inside circulation pipeline between the cold medium liquid export with the acetaldehyde rectifying column, liquid accessible in the acetaldehyde rectifying column enter into after circulation mechanism exports once more in the reboiler and carry out circulation heating for liquid effectively heats up the back again and carries out the secondary heating and obtain effectively to decompose and draw.
Preferably, the circulating mechanism comprises a conveying pipeline arranged between the acetaldehyde rectifying tower and the cold medium liquid inlet and a reflux pump arranged on the conveying pipeline.
Preferably, a detachable filter is connected in series between the reflux pump and the acetaldehyde rectifying tower, and the liquid flowing out of the bottom of the acetaldehyde rectifying tower is filtered by the filter and then enters the reflux pump for liquid supply.
Preferably, two groups of reflux pumps and the filter are arranged in parallel between the acetaldehyde rectifying tower and the cold medium liquid inlet.
Preferably, two ends of the filter are connected with the conveying pipeline through flanges, a two-way control valve is arranged at the inlet end of the filter, and a three-way control valve is arranged between the two reflux pumps and the cold medium liquid inlet.
Preferably, the conveying pipeline comprises a stainless steel outer pipe and an anti-corrosion infusion pipe arranged in the stainless steel outer pipe, and a heat insulation layer is arranged between the stainless steel outer pipe and the anti-corrosion infusion pipe which are exposed outside.
Preferably, the reboiler is a forced horizontal reboiler.
Compared with the prior art, the utility model has the beneficial effects that:
the cooling liquid at the bottom of the acetaldehyde rectifying tower is conveyed into the reboiler again through the circulating mechanism for circulating heating, so that the liquid is heated effectively and then flows back into the acetaldehyde rectifying tower through the cooling medium liquid outlet for secondary heating, thereby effectively decomposing and extracting, effectively reducing the residue of low boiling point substances in wastewater, increasing the extraction quantity of the low boiling point substances in the device, ensuring the safe and stable operation of the whole device, further improving the product quality and the yield, further improving the economic efficiency and the maintenance production stability, and being suitable for optimizing and improving various devices adopting steam decomposition heating in polymerization chemical enterprises, thereby really achieving the purposes of energy conservation, emission reduction, cost reduction and synergy.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
in the figure: 1. a condensate delivery pump; 2. a wastewater collection tank; 3. a cold medium liquid inlet; 4. a heating medium inlet; 5. a reboiler; 6. a heating medium outlet; 7. a cold medium liquid outlet; 8. an acetaldehyde rectifying tower; 9. a delivery conduit; 10. a circulation mechanism; 11. a two-way control valve; 12. a filter; 13. a reflux pump; 14. and a three-way control valve.
Detailed Description
The present application will be further described with reference to the drawings and detailed description, which should be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
In the description of the present application, it should be understood that the terms "upper," "lower," "left," "right," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like in this application are used for distinguishing between similar objects and not for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
As shown in fig. 1, an acetaldehyde tower circulation heating structure comprises a wastewater collection tank 2, a condensate delivery pump 1 and an acetaldehyde rectifying tower 8, wherein a reboiler 5 is arranged between the condensate delivery pump 1 and the acetaldehyde rectifying tower 8, a heating medium outlet 6 and a cooling medium liquid outlet 7 are arranged at the top of the reboiler 5, a heating medium inlet 4 and a cooling medium liquid inlet 3 are arranged at the lower part of the reboiler, a water outlet of the condensate delivery pump 1 is connected with the cooling medium liquid inlet 3, the reboiler 5 is connected with the acetaldehyde rectifying tower 8 through the cooling medium liquid outlet 7, a circulation mechanism 10 is further arranged between the acetaldehyde rectifying tower 8 and the cooling medium liquid inlet 3, an internal circulation pipeline is formed between the acetaldehyde rectifying tower 8 and the reboiler 5 through the circulation mechanism 10 and a conveying pipeline 9 between the cooling medium liquid outlet 7 and the acetaldehyde rectifying tower 8, and liquid in the acetaldehyde rectifying tower 8 can be circularly heated in the acetaldehyde rectifying tower 8 after being output again through the circulation mechanism 10, so that the reboiler effectively heats acetaldehyde in the acetaldehyde rectifying tower 8 after being effectively heated up, and then the acetaldehyde is effectively heated up in the distillation tower 8.
In the practical use process, the liquid in the wastewater collection tank 2 is conveyed into the reboiler 5 forward through the condensate conveying pump 1 for heating and then conveyed into the acetaldehyde rectifying tower 8 for decomposition and extraction, when the reboiler 5 is installed, the top of the reboiler 5 is provided with a heating medium outlet 6 and a cooling medium liquid outlet 7, and the lower part is provided with a heating medium inlet 4 and a cooling medium liquid inlet 3, wherein the liquid output by the condensate conveying pump 1 enters the reboiler 5 through the cooling medium liquid inlet 3, is heated by the reboiler 5, flows out from the cooling medium liquid outlet 7 into the acetaldehyde rectifying tower 8, and the reboiler 5 is heated through high-temperature gas flowing between the heating medium inlet 4 and the heating medium outlet 6, thereby realizing the heating of low-temperature liquid in the reboiler 5, especially, a circulation mechanism 10 is arranged between the acetaldehyde rectifying tower 8 and the cold medium liquid inlet 3, when the circulation mechanism 10 is in dark rotation, holes are formed at the bottom of the acetaldehyde rectifying tower 8 and the upper edge of the tower liquid bag layer, a conveying pipeline 9DN50 is adopted to connect the bottom position to pass through the circulation mechanism 10, the circulation mechanism 10 pumps the wastewater in the acetaldehyde rectifying tower 8, heats the wastewater by a reboiler 5, and returns the wastewater to the repeated circulation heating in the liquid bag of the acetaldehyde rectifying tower 8, thereby ensuring the stability of the temperature at the bottom of the acetaldehyde rectifying tower 8, the temperature control range of the top of the acetaldehyde rectifying tower 8 can be in a region with relatively small fluctuation, the wastewater in the acetaldehyde rectifying tower 8 is repeatedly circulated after heat exchange, so that the acetaldehyde/2-md content in the wastewater in the acetaldehyde rectifying tower 8 is obviously reduced compared with the prior art, the yield is further improved to a certain extent, the cooling liquid at the bottom of the acetaldehyde rectifying tower 8 is conveyed into the reboiler 5 again through the circulating mechanism 10 for circulating heating, so that the liquid is effectively heated and then flows back into the acetaldehyde rectifying tower 8 through the cooling medium liquid outlet 7 for secondary heating, thereby effectively decomposing and extracting, effectively reducing the residue of low boiling point substances in wastewater, increasing the extraction quantity of the low boiling point substances in the device, ensuring the safe and stable operation of the whole device, further improving the product quality and yield, further improving the economic efficiency and maintaining the production stability, being applicable to optimizing and improving various devices adopting steam decomposition heating in polymerization chemical enterprises, and really achieving the purposes of energy conservation, emission reduction, cost reduction and synergy.
Further improved is that the circulating mechanism 10 comprises a conveying pipeline 9 arranged between the acetaldehyde rectifying tower 8 and the cold medium liquid inlet 3, and a reflux pump 13 arranged on the conveying pipeline 9; a detachable filter 12 is connected in series between the reflux pump 13 and the acetaldehyde rectifying tower 8, and liquid flowing out of the bottom of the acetaldehyde rectifying tower 8 is filtered by the filter 12 and then enters the reflux pump 13 for liquid supply; the reboiler 5 is a forced horizontal reboiler 5.
The reflux pump 13 adopts a 26P01A/B pump, the reboiler 5 is a forced horizontal reboiler, and the scaling rate can be greatly reduced under the condition that the flow rate and the very low evaporation rate of fluid in the acetaldehyde rectifying tower 8 are kept high. And a detachable filter 12 is connected in series between the reflux pump 13 and the acetaldehyde rectifying tower 8, so that impurities can be effectively filtered through the filter 12, and the disassembly and cleaning operation are facilitated.
In a further improvement, two groups of reflux pumps 13 and filters 12 are arranged in parallel between the acetaldehyde rectifying column 8 and the cold medium liquid inlet 3.
Two groups of parallel reflux pumps 13 and filters 12 form the purpose of sustainable operation, one group is used for normal operation and the other group is used for standby during actual use, when one group needs to be overhauled or replaced, the other group is started, so that non-stop operation between the acetaldehyde rectifying tower 8 and the reboiler 5 can be realized, and the problem that shutdown occurs when one reflux pump 13 or filter 12 is damaged or needs to be overhauled is effectively avoided.
In a further improvement, two ends of the filter 12 are connected with the conveying pipeline 9 through flanges, a two-way control valve 11 is arranged at the inlet end of the filter 12, and a three-way control valve 14 is arranged between the two reflux pumps 13 and the cold medium liquid inlet 3.
The liquid flow path between the acetaldehyde rectifying column 8 and reboiler 5 can be arbitrarily adjusted by the two-way control valve 11 and the three-way control valve 14 so that no liquid is supplied between the set of reflux pumps 13 and the filter 12 that need maintenance or replacement.
The conveying pipeline 9 comprises a stainless steel outer pipe and an anti-corrosion infusion pipe arranged in the stainless steel outer pipe, and a heat insulation layer is further arranged between the stainless steel outer pipe and the anti-corrosion infusion pipe which are exposed outside.
The conveying pipeline 9 for connecting the acetaldehyde rectifying tower 8 and the reboiler 5 adopts a stainless steel outer pipe and a built-in anti-corrosion infusion pipe structure, so that relatively cold liquid at the bottom of the acetaldehyde rectifying tower 8 can be effectively heated in a cavity of the reboiler 5 through a heating medium to enter the acetaldehyde rectifying tower 8 again for decomposition, a heat insulation layer is further arranged between the exposed stainless steel outer pipe and the anti-corrosion infusion pipe, and after heat insulation is carried out through the heat insulation layer, the heat loss of the liquid is smaller, and the energy-saving and environment-friendly effects are achieved.
The above embodiments are only preferred embodiments of the present application, and the scope of the present application is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present application are intended to be within the scope of the present application.
Claims (7)
1. The utility model provides an acetaldehyde tower circulation heating structure, includes waste water collection tank (2), lime set delivery pump (1), acetaldehyde rectifying column (8), its characterized in that: the device is characterized in that a reboiler (5) is arranged between the condensate delivery pump (1) and the acetaldehyde rectifying tower (8), a heating medium outlet (6) and a cold medium liquid outlet (7) are arranged at the top of the reboiler (5), a heating medium inlet (4) and a cold medium liquid inlet (3) are arranged at the lower part of the reboiler, a water outlet of the condensate delivery pump (1) is connected with the cold medium liquid inlet (3), the reboiler (5) is connected with the acetaldehyde rectifying tower (8) through the cold medium liquid outlet (7), a circulating mechanism (10) is further arranged between the acetaldehyde rectifying tower (8) and the cold medium liquid inlet (3), an internal circulating pipeline is formed between the circulating mechanism (10) and a conveying pipeline (9) between the acetaldehyde rectifying tower (8), and liquid in the acetaldehyde rectifying tower (8) can be output again through the circulating mechanism (10) and then enters the reboiler (5) for effectively heating the acetaldehyde to be heated, and then the liquid is effectively decomposed and distilled into the acetaldehyde (8).
2. The acetaldehyde column cycle heating structure as in claim 1, wherein: the circulating mechanism (10) comprises a conveying pipeline (9) arranged between the acetaldehyde rectifying tower (8) and the cold medium liquid inlet (3), and a reflux pump (13) arranged on the conveying pipeline (9).
3. The acetaldehyde column cycle heating structure as in claim 2, wherein: a detachable filter (12) is connected in series between the reflux pump (13) and the acetaldehyde rectifying tower (8), and liquid flowing out of the bottom of the acetaldehyde rectifying tower (8) is filtered by the filter (12) and then enters the reflux pump (13) for liquid supply.
4. The acetaldehyde column cycle heating structure as in claim 3, wherein: two groups of reflux pumps (13) and filters (12) are arranged in parallel between the acetaldehyde rectifying tower (8) and the cold medium liquid inlet (3).
5. The acetaldehyde column cycle heating structure as in claim 4, wherein: the two ends of the filter (12) are connected with the conveying pipeline (9) through flanges, a two-way control valve (11) is arranged at the inlet end of the filter (12), and a three-way control valve (14) is arranged between the two reflux pumps (13) and the cold medium liquid inlet (3).
6. The acetaldehyde column cycle heating structure as in claim 2, wherein: the conveying pipeline (9) comprises a stainless steel outer pipe and an anti-corrosion infusion pipe arranged in the stainless steel outer pipe, and a heat insulation layer is arranged between the stainless steel outer pipe and the anti-corrosion infusion pipe which are exposed outside.
7. The acetaldehyde column cycle heating structure as in claim 1, wherein: the reboiler (5) is a forced horizontal reboiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223109576.0U CN219398987U (en) | 2022-11-23 | 2022-11-23 | Circulating heating structure of acetaldehyde tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223109576.0U CN219398987U (en) | 2022-11-23 | 2022-11-23 | Circulating heating structure of acetaldehyde tower |
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| Publication Number | Publication Date |
|---|---|
| CN219398987U true CN219398987U (en) | 2023-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223109576.0U Active CN219398987U (en) | 2022-11-23 | 2022-11-23 | Circulating heating structure of acetaldehyde tower |
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