CN214114971U - Chemical industry industrial waste water recycle device - Google Patents
Chemical industry industrial waste water recycle device Download PDFInfo
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- CN214114971U CN214114971U CN202023330934.1U CN202023330934U CN214114971U CN 214114971 U CN214114971 U CN 214114971U CN 202023330934 U CN202023330934 U CN 202023330934U CN 214114971 U CN214114971 U CN 214114971U
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Abstract
The utility model provides a chemical industry industrial waste water recycle device, wherein, retrieve three tower cauldron waters of three towers and introduce in the flash tank through the pipeline, the liquid phase saturated water that the flash distillation formed is sent into the reinforced heat exchanger of polymerization two towers through the pipeline through three tower cauldron pumps, discharge after the heat transfer with the reinforced carrying on of polymerization two towers, send into three tower cauldron water condensers in through the pipeline, liquid phase saturated water after the condensation is through three tower cauldron water condensers's export discharge, send into storage in the extraction basin through the pipeline, as the extraction water, the extraction basin can be through the pipeline that has the extraction pump with the extraction water add in the polymerization two towers. The utility model discloses can the rational utilization retrieve the heat of three tower cauldron waters of process, improve the waste water rate of recycling.
Description
Technical Field
The utility model relates to a chemical production field, the more specifically chemical industry industrial waste water recycle device that says so.
Background
Water is a source of life, industrial blood, and life pulse in cities. With the increase of human activities, water resource problems are attracting more and more attention. The current ubiquitous water resource shortage in China has really affected people's actual life and industrial and agricultural production. To maintain social development, national policies and market laws will rapidly increase water intake and drainage prices, and such policies will be implemented nationwide, including areas with abundant water resources. Therefore, the cost of water is greatly increased. Therefore, how to do water-saving work, continuously adopting and perfecting a feasible waste water recycling scheme, and recycling waste water to the maximum extent is an important measure for protecting water resources, and has practical significance for reducing cost. In particular, in the chemical industry, a large amount of high-temperature steam and cooling water are required to be consumed in the production process, the heating and preheating in the production process are met through heat source steam, and the material cooling is met through cooling water, so that various factors influencing water saving are analyzed according to the requirements and characteristics of water use and drainage of various production systems in the water saving work, old equipment is reformed to optimize a water supply flow, a feasible water saving scheme is formulated, and the reuse water rate and the wastewater recovery rate are continuously improved; in addition, through water quantity balance and water quality investigation, waste water treatment equipment is added, so that the maximum comprehensive economic benefit and social benefit of limited water resources are brought into play. In view of long-term consideration of enterprises, the aim of saving water is fulfilled by adopting centralized treatment of industrial wastewater to reduce wastewater discharge as much as possible.
In the polyvinyl alcohol chemical industry, production equipment is mostly a rectifying tower, and a large amount of steam and cooling water are needed for stable operation of a system for producing a polyvinyl alcohol, wherein in a polymerization process, after polyvinyl acetate finishes polymerization reaction, a large amount of vinyl acetate monomers are contained in resin, and the monomer removal and purification are needed to be carried out continuously through the rectifying tower. The second polymerization tower is separated by using the azeotropic mode of methanol and vinyl acetate, the rectification mode is azeotropic rectification and extractive rectification, the extractant is water, and desalted water is used as extraction water and added into the second tower for use. The methanol content of the bottom of the second polymerization tower is 35 percent, the water content is 65 percent, the bottom of the second polymerization tower is used as the feed of the third recovery tower, and the methanol and the water are separated. Water with the methanol content of less than 0.01 percent and the temperature of about 130 ℃ is discharged from the kettle of the three towers, the water is returned to a flash tank in the polymerization process for flash evaporation, and gas phase steam is recycled and used as a heat source of a reboiler of the two towers, so that the steam is saved; liquid phase water exchanges heat with materials by acting on a second-tower charging heat exchanger, so that the charging temperature of the second tower is increased, and steam is saved; and directly discharging the water phase after heat exchange into a trench, and treating the water phase in a sewage treatment plant. The waste water after heat exchange has high temperature due to the three-tower kettle, so the waste water has great harm to the fungi of a sewage treatment plant, and the treatment load of the sewage treatment plant is increased. Meanwhile, water in the kettle of the three towers is directly discharged to a trench, and fresh desalted water needs to be supplemented to the extraction water tank of the second polymerization tower for extraction water, so that waste of water resources is caused, and economic operation is not facilitated.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving above-mentioned technical problem to a certain extent at least. Therefore, the utility model provides a chemical industry industrial waste water recycle device can the rational utilization heat of recovery process three tower cauldron waters, improves the waste water rate of recycling.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a chemical industry industrial waste water recycle device which structural feature is:
comprises a recovery three-tower, a flash tank, a three-tower kettle pump, a polymerization two-tower charging heat exchanger, a three-tower kettle water condenser, an extraction water tank and an extraction water pump;
the recovery three-tower is applied to a recovery procedure and used for finishing rectification separation of methanol and water, and formed three-tower kettle water is introduced into a flash tank from a three-tower kettle liquid discharge port through a pipeline through an upper liquid phase inlet of the flash tank;
the flash tank is applied to a polymerization process, gas-phase vapor formed by flash evaporation is sent to a reboiler of a second tower in the polymerization process through a gas-phase pipeline, formed liquid-phase saturated water is discharged from a liquid-phase outlet at the lower part, and is sent to a feeding heat exchanger of the second tower in the polymerization process through a pump of a third tower and a liquid-phase inlet before heat exchange at the upper part of the feeding heat exchanger of the second tower in the polymerization process through a pipeline;
in the second polymerization tower feeding heat exchanger, the second polymerization tower feeding is fed from a material inlet at the lower part of the second polymerization tower feeding heat exchanger and discharged from a material outlet at the upper part, and the liquid phase saturated water is discharged from a liquid phase outlet after heat exchange at the lower part of the second polymerization tower feeding heat exchanger and is fed into the third polymerization tower water condenser through an inlet of the third polymerization tower water condenser through a pipeline;
the three-tower kettle water condenser is used for condensing liquid phase saturated water, and the condensed liquid phase saturated water is discharged through an outlet of the three-tower kettle water condenser and is sent into an extraction water tank through a pipeline to be stored as extraction water;
the extraction water tank can feed extraction water into the second polymerization tower through a pipeline with an extraction water pump.
The utility model discloses a structural feature also lies in:
the water condenser of the three-tower kettle is a horizontal condenser, the cold medium is circulating water at 25 ℃, the circulating water flows in a tube pass, and the liquid-phase saturated water flows in a shell pass.
In a second polymerization tower feeding heat exchanger, the temperature of the second polymerization tower feeding incoming material is 40 ℃.
Compared with the prior art, the utility model discloses beneficial effect embodies:
the utility model discloses the heat of rational utilization recovery process three tower cauldron waters improves reinforced temperature with the reinforced heat transfer of accomplishing of polymerization two towers, reduces steam consumption, and the reuse is the extraction water after the three tower cauldron water landscape cooling treatment that will originally drain the trench simultaneously, reduces the consumption of demineralized water, has improved the waste water rate of recycling, has avoided the waste of water resource, is favorable to energy saving and consumption reduction.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, 1, three recovery towers; 2, a flash tank; 3 three-tower kettle pump; 4, a polymerization second tower feeding heat exchanger; 5, a three-tower kettle water condenser; 6, an extraction water tank; 7 extraction water pump.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, the chemical industry industrial wastewater recycling device of the embodiment has the following structure:
comprises a recovery three-tower 1, a flash tank 2, a three-tower kettle pump 3, a polymerization two-tower charging heat exchanger 4, a three-tower kettle water condenser 5, an extraction water tank 6 and an extraction water pump 7;
the recovery three-tower 1 is applied to a recovery procedure and is used for finishing the rectification separation of methanol and water, and the formed three-tower kettle water is introduced into the flash tank 2 from a three-tower kettle liquid discharge port through a pipeline and through an upper liquid phase inlet of the flash tank 2;
the flash tank 2 is applied to a polymerization process, gas-phase vapor formed by flash evaporation is sent to a reboiler of a second polymerization process tower through a gas-phase pipeline, formed liquid-phase saturated water is discharged from a liquid-phase outlet at the lower part, and is sent to the second polymerization tower charging heat exchanger 4 through a three-tower kettle pump 3 from a liquid-phase inlet before heat exchange at the upper part of the second polymerization tower charging heat exchanger 4 through a pipeline;
in the second polymerization tower feeding heat exchanger 4, the second polymerization tower feeding is fed from a material inlet at the lower part of the second polymerization tower feeding heat exchanger 4 and discharged from a material outlet at the upper part, and liquid-phase saturated water is discharged from a liquid-phase outlet after heat exchange at the lower part of the second polymerization tower feeding heat exchanger 4 and is fed into the third polymerization tower kettle water condenser 5 through an inlet of the third polymerization tower kettle water condenser 5 by a pipeline;
the three-tower kettle water condenser 5 is used for condensing liquid phase saturated water, and the condensed liquid phase saturated water is discharged through an outlet of the three-tower kettle water condenser 5 and is sent into the extraction water tank 6 through a pipeline to be stored as extraction water;
the extraction water tank 6 can feed extraction water into the second polymerization column through a pipe having an extraction water pump 7.
In specific implementation, the corresponding setting also includes:
the three-tower kettle water condenser 5 is a horizontal condenser, the cooling medium is circulating water at 25 ℃, circulating water flows in a tube pass, and liquid-phase saturated water flows in a shell pass.
The feeding heat exchanger 4 of the second polymerization tower is of a plate-type structure, and the feeding temperature of the second polymerization tower is 40 ℃.
Based on the device, the embodiment of the utility model provides a chemical industry industrial waste water recycle method is proposed simultaneously, including following step:
step 1, after the recovery three towers 1 in the recovery process finish the rectification separation of methanol and water, the obtained kettle water of the three towers is sent into a flash tank 2 in the polymerization process for flash evaporation through a pipeline;
step 3, in a second polymerization tower charging heat exchanger 4, carrying out heat exchange at intervals between liquid phase saturated water and second polymerization tower charging, and increasing the second polymerization tower charging temperature to 65 ℃ after heat exchange;
step 4, after the interval heat exchange in the step 3 is completed, liquid phase saturated water in the polymerization second-tower charging heat exchanger 4 is sent into the three-tower kettle water condenser 5 through a pipeline, and carries out interval cooling and heat exchange with circulating water in the three-tower kettle water condenser 5 to obtain condensation;
and 5, sending the condensed liquid-phase saturated water into an extraction water tank 6 through a pipeline, taking the liquid-phase saturated water as extraction water for later use, and adding the extraction water into a second polymerization tower through an extraction water pump 7.
After rectification separation of methanol and water is completed in a recovery tower 1 in a recovery process, high-purity methanol steam is arranged at the top of a tower III, the water temperature of the tower III is 130 +/-1 ℃, the component of the water is water with the methanol content of less than 0.01%, the water in the tower III is completely sent to a polymerization process flash tank 2 through a pipeline for flash evaporation (D in figure 1 is steam), gas-phase steam and liquid-phase saturated water are obtained, the gas-phase steam is sent to a polymerization process tower reboiler (A in figure 1) through a gas-phase pipeline for providing a heat source, the use amount of partial steam in the tower reboiler is directly saved, and the liquid-phase saturated water is sent to a polymerization tower feed heat exchanger 4 through a tower III pump 3;
in the second polymerization tower feeding heat exchanger 4, the temperature of the second polymerization tower feeding incoming material is 40 ℃, heat exchange is carried out between the second polymerization tower feeding incoming material and liquid phase saturated water at intervals, the feeding temperature of the second polymerization tower is increased to 65 ℃ after heat exchange, and by increasing the feeding temperature, the use of the second polymerization tower steam is effectively reduced, so that economic operation is achieved;
after the liquid phase saturated water and the feeding of the second polymerization tower are subjected to intermittent heat exchange, the liquid phase saturated water enters a three-tower kettle water condenser 5 for further temperature adjustment, is subjected to intermittent cooling and heat exchange with circulating water (shown as E in figure 1), is subjected to cooling treatment, is condensed and then enters an extraction water tank 6 to be used as extraction water for recycling, and is added into the second polymerization tower (shown as C in figure 1) through an extraction water pump 7.
The second polymerization tower is used for separating vinyl acetate and methanol, and because the boiling points are close and the vinyl acetate and the methanol are not easy to separate, a third group of water is added to be used as an extracting agent so as to achieve the separation effect, the water and the methanol are mutually dissolved to form a heavy component, and the heavy component is sent to a second tower kettle for recycling and refining. In production, typically desalted water (shown as B in fig. 1) is used as the source of extractant water. Because the feed of the recovery tower 1 comes from the kettle of the second polymerization tower, the kettle water of the recovery tower 1 can be cooled for recycling, and other impurity components influencing the operation of the tower are not contained. In the embodiment, the water in the three-tower kettle is recycled as the extraction water, so that the consumption of desalted water is reduced.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (3)
1. The utility model provides a chemical industry industrial waste water recycle device which characterized by:
comprises a recovery three-tower, a flash tank, a three-tower kettle pump, a polymerization two-tower charging heat exchanger, a three-tower kettle water condenser, an extraction water tank and an extraction water pump;
the recovery three-tower is applied to a recovery procedure and used for finishing rectification separation of methanol and water, and formed three-tower kettle water is introduced into a flash tank from a three-tower kettle liquid discharge port through a pipeline through an upper liquid phase inlet of the flash tank;
the flash tank is applied to a polymerization process, gas-phase vapor formed by flash evaporation is sent to a reboiler of a second tower in the polymerization process through a gas-phase pipeline, formed liquid-phase saturated water is discharged from a liquid-phase outlet at the lower part, and is sent to a feeding heat exchanger of the second tower in the polymerization process through a pump of a third tower and a liquid-phase inlet before heat exchange at the upper part of the feeding heat exchanger of the second tower in the polymerization process through a pipeline;
in the second polymerization tower feeding heat exchanger, the second polymerization tower feeding is fed from a material inlet at the lower part of the second polymerization tower feeding heat exchanger and discharged from a material outlet at the upper part, and the liquid phase saturated water is discharged from a liquid phase outlet after heat exchange at the lower part of the second polymerization tower feeding heat exchanger and is fed into the third polymerization tower water condenser through an inlet of the third polymerization tower water condenser through a pipeline;
the three-tower kettle water condenser is used for condensing liquid phase saturated water, and the condensed liquid phase saturated water is discharged through an outlet of the three-tower kettle water condenser and is sent into an extraction water tank through a pipeline to be stored as extraction water;
the extraction water tank can feed extraction water into the second polymerization tower through a pipeline with an extraction water pump.
2. The chemical industry industrial wastewater recycling device of claim 1, which is characterized in that:
the water condenser of the three-tower kettle is a horizontal condenser, the cold medium is circulating water at 25 ℃, the circulating water flows in a tube pass, and the liquid-phase saturated water flows in a shell pass.
3. The chemical industry industrial wastewater recycling device of claim 1, which is characterized in that: in a second polymerization tower feeding heat exchanger, the temperature of the second polymerization tower feeding incoming material is 40 ℃.
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| CN202023330934.1U CN214114971U (en) | 2020-12-31 | 2020-12-31 | Chemical industry industrial waste water recycle device |
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| CN202023330934.1U CN214114971U (en) | 2020-12-31 | 2020-12-31 | Chemical industry industrial waste water recycle device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112759015A (en) * | 2020-12-31 | 2021-05-07 | 内蒙古蒙维科技有限公司 | Industrial wastewater recycling device and method for chemical industry |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112759015A (en) * | 2020-12-31 | 2021-05-07 | 内蒙古蒙维科技有限公司 | Industrial wastewater recycling device and method for chemical industry |
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