CN213950877U - Polyvinyl alcohol production technology water cascade utilizes system - Google Patents
Polyvinyl alcohol production technology water cascade utilizes system Download PDFInfo
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- CN213950877U CN213950877U CN202021356045.XU CN202021356045U CN213950877U CN 213950877 U CN213950877 U CN 213950877U CN 202021356045 U CN202021356045 U CN 202021356045U CN 213950877 U CN213950877 U CN 213950877U
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Abstract
The utility model relates to a polyvinyl alcohol production technology water cascade utilizes system. The method comprises the steps that recovered aqueous solution of a first recovery rectifying tower a or a first recovery rectifying tower b enters a third section energy-saving polymerization tower to carry out methanol purification, and the purified methanol enters a methanol extraction system; the rest of the recovery aqueous solution of the first recovery rectifying tower a and the first recovery rectifying tower b enters a third recovery rectifying tower a; the recovered aqueous solutions of the second recovery rectifying tower a and the second recovery rectifying tower b enter a third recovery rectifying tower b; the recovered water solution of the third recovery rectifying tower b enters a cooling system for cooling after heat exchange through a heat exchanger b; the recovered water solution of the third recovery rectifying tower b enters a second polymerization rectifying tower a and a second polymerization rectifying tower b; and the recovered aqueous solution of the second polymeric distillation tower a and the second polymeric distillation tower b enters a third recovery distillation tower a. The utility model discloses production technology water reason reuse, still make full use of the heat of production technology water, energy-conservation, emission reduction, environmental protection.
Description
Technical Field
The utility model belongs to the technical field of polyvinyl alcohol production technology, concretely relates to polyvinyl alcohol production technology water cascade utilizes system.
Background
Nowadays, energy conservation and emission reduction are the problems that modern production plants need to consider, or when the amount of sewage generated in the production process of polyvinyl alcohol exceeds the sewage treatment capacity, the aim of energy conservation and emission reduction is achieved from the source link under the condition that the normal production load is ensured to be unchanged. Therefore, how to realize the serial utilization of the process water of the recovery workshop and the polymerization workshop is a problem which needs to be solved urgently.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a polyvinyl alcohol production technology water cascade utilizes system.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a serial utilization system for process water in polyvinyl alcohol production comprises a process water self-softening water system and a sewage collecting pool, and further comprises a first recovery rectifying tower a, a second recovery rectifying tower a, a third recovery rectifying tower a, a second polymerization rectifying tower a, a first recovery rectifying tower b, a second recovery rectifying tower b, a third recovery rectifying tower b, a second polymerization rectifying tower b, a cooling system, a heat exchanger and a third section energy polymerization tower; an outlet of the first recovery rectifying tower a or the first recovery rectifying tower b is communicated with an inlet of a third energy-saving polymerization tower for methanol purification, and an outlet of the third energy-saving polymerization tower is communicated with an inlet of a methanol extraction system, so that the purified methanol enters the methanol extraction system; the outlets of the first recovery rectifying tower a and the first recovery rectifying tower b are also communicated with the inlet of a third recovery rectifying tower a, so that the rest part of the recovery aqueous solution enters the third recovery rectifying tower a; the outlet of the second recovery rectifying tower a and the outlet of the second recovery rectifying tower b are both communicated with the inlet of the third recovery rectifying tower b, so that the recovered aqueous solution enters the third recovery rectifying tower b; an outlet of the third recovery rectifying tower b is sequentially communicated with a heat exchanger b and a cooling system, so that a recovered water solution of the third recovery rectifying tower b enters the cooling system for cooling after heat exchange through the heat exchanger b, and the heat exchanger b is close to a third section of energy-efficient polymerization tower to provide heat for methanol purification of the third section of energy-efficient polymerization tower; the outlet of the third recovery rectifying tower b is also communicated with the inlets of the second polymerization rectifying tower a and the second polymerization rectifying tower b, so that a part of the cooled recovered water solution of the third recovery rectifying tower b enters the second polymerization rectifying tower a, and the rest part of the cooled recovered water solution enters the second polymerization rectifying tower b, and provides process water required by rectification for the first polymerization rectifying tower a and the second polymerization rectifying tower b; outlets of the second polymeric rectification tower a, the second polymeric rectification tower b, the first recovery rectification tower a and the first recovery rectification tower b are also communicated with an inlet of a third recovery rectification tower a, so that recovered aqueous solutions of the second polymeric rectification tower a and the second polymeric rectification tower b and residual recovered aqueous solutions of the first recovery rectification tower a and the first recovery rectification tower b are converged into the third recovery rectification tower a; the outlet of the third recovery rectifying tower a is also sequentially communicated with a heat exchanger a and a sewage collecting pool, so that the recovered water solution of the third recovery rectifying tower a enters the sewage collecting pool after heat exchange through the heat exchanger a, and the heat exchanger a is close to a third section energy polymerization tower to provide heat for methanol purification of the third section energy polymerization tower.
Further, the outlet of the first recovery rectifying tower a or the first recovery rectifying tower b is simultaneously communicated with the third recovery rectifying tower a and the third energy-saving polymerization tower.
Further, the cooling system is a chiller.
Has the advantages that: the production process water is reasonably recycled, the heat of the production process water is fully utilized, and the energy conservation, emission reduction and environmental protection are realized.
Drawings
FIG. 1 is a schematic view of a water cascade utilization system for a polyvinyl alcohol production process;
FIG. 2 is a schematic view of another series water utilization system for polyvinyl alcohol production;
FIG. 3 is a schematic view of a cascade utilization system of original polyvinyl alcohol production process water;
in the figure, a first recovery rectifying tower a 1A, a first recovery rectifying tower B1B, a second recovery rectifying tower a 2A, a second recovery rectifying tower B2B, a third recovery rectifying tower a 3A, a third recovery rectifying tower B3B, a second polymeric rectifying tower a 4A, a second polymeric rectifying tower B4B, a process water self-softening water system 5, a sewage collecting tank 6, a third section energy polymerization tower 7, a heat exchanger a 8A, a heat exchanger B8B, a methanol extraction system 9 and a cooling system 10.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in figure 3, the process water treatment of the original 2 sets of tower kettles is realized, the process water is not recycled, and thus a large amount of sewage is generated, and a great burden is caused on sewage treatment.
The embodiment is the improvement of 2 sets of tower kettles, and as shown in fig. 1, a serial utilization system of polyvinyl alcohol production process water is shown, which comprises a process water self-softening water system 5 and a sewage collection tank 6, and further comprises a first recovery rectifying tower a 1A, a second recovery rectifying tower a 2A, a third recovery rectifying tower a 3A, a second polymerization rectifying tower a 4A, a first recovery rectifying tower a 1B, a second recovery rectifying tower a 2B, a third recovery rectifying tower a 3B, a second polymerization rectifying tower B4B, a cooling system 10, a heat exchanger and a third energy-saving polymerization tower 7; the recovered aqueous solution of the first recovery rectifying tower a 1A or the first recovery rectifying tower a 1B enters a third section energy-saving polymerization tower 7 for methanol purification, and the purified methanol enters a methanol extraction system 9; the rest of the recovery aqueous solution of the first recovery rectifying tower a 1A and the first recovery rectifying tower a 1B enters a third recovery rectifying tower a 3A; the process water provides process water for the second recovery rectifying tower a 2A and the second recovery rectifying tower a 2B from the soft water system 5, and the recovery water solutions of the second recovery rectifying tower a 2A and the second recovery rectifying tower a 2B enter the third recovery rectifying tower a 3B; the recovered water solution of the third recovery rectifying tower a 3B enters a cooling system 10 for cooling after heat exchange through a heat exchanger a 8B, and the heat exchanger a 8B uses the heat for methanol purification of a third energy-saving polymerization tower 7; a part of the cooled recovered aqueous solution of the third recovery rectifying tower a 3B enters a second polymerization rectifying tower a 4A, and the rest enters a second polymerization rectifying tower B4B, so that process water required for rectification is provided for the first polymerization rectifying tower a and the second polymerization rectifying tower B4B; the recovered aqueous solutions of the second polymeric distillation column a 4A and the second polymeric distillation column B4B and the residual recovered aqueous solutions of the first recovered distillation column a 1A and the first recovered distillation column a 1B are merged into a third recovered distillation column a 3A; the recovered water solution of the third recovery rectifying tower a 3A enters the sewage collecting tank 6 after heat exchange through the heat exchanger a 8A, and the heat is also used for purifying the methanol of the third energy-saving polymerization tower 7 by the heat exchanger a 8A. Therefore, the waste heat of the recovered aqueous solution is utilized, and the steam consumption of a workshop can be reduced. The cooling system 10 includes or is a chiller.
Example two
Some of the above embodiments are not mentioned in this example.
Considering the effective degree of heat recovery in the recovered aqueous solution of the third recovery rectifying tower, or the insufficient amount of heat recovery, or limited to the working capacity of the third energy-saving polymerization tower 7, in practical production, it can be considered to reduce the recovered aqueous solution entering the third energy-saving polymerization tower 7, as shown in fig. 2, another solution is shown: part of the recovered aqueous solution of the first recovered rectifying column a 1A or part of the recovered aqueous solution of the first recovered rectifying column a 1B is introduced into the third energy-saving polymerization column 7. Thus, the smooth production can be ensured.
To sum up, the utility model discloses obvious beneficial effect does: the production process water is reasonably recycled, the heat of the production process water is fully utilized, and the energy conservation, emission reduction and environmental protection are realized.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (3)
1. A serial utilization system for process water of polyvinyl alcohol production comprises a process water self-softening water system and a sewage collecting pool, and is characterized by further comprising a first recovery rectifying tower a, a second recovery rectifying tower a, a third recovery rectifying tower a, a second polymerization rectifying tower a, a first recovery rectifying tower b, a second recovery rectifying tower b, a third recovery rectifying tower b, a second polymerization rectifying tower b, a cooling system, a heat exchanger and a third section energy polymerization tower; an outlet of the first recovery rectifying tower a or the first recovery rectifying tower b is communicated with an inlet of a third energy-saving polymerization tower for methanol purification, and an outlet of the third energy-saving polymerization tower is communicated with an inlet of a methanol extraction system, so that the purified methanol enters the methanol extraction system; the outlets of the first recovery rectifying tower a and the first recovery rectifying tower b are also communicated with the inlet of a third recovery rectifying tower a, so that the rest part of the recovery aqueous solution enters the third recovery rectifying tower a; the outlet of the second recovery rectifying tower a and the outlet of the second recovery rectifying tower b are both communicated with the inlet of the third recovery rectifying tower b, so that the recovered aqueous solution enters the third recovery rectifying tower b; an outlet of the third recovery rectifying tower b is sequentially communicated with a heat exchanger b and a cooling system, so that a recovered water solution of the third recovery rectifying tower b enters the cooling system for cooling after heat exchange through the heat exchanger b, and the heat exchanger b is close to a third section of energy-efficient polymerization tower to provide heat for methanol purification of the third section of energy-efficient polymerization tower; the outlet of the third recovery rectifying tower b is also communicated with the inlets of the second polymerization rectifying tower a and the second polymerization rectifying tower b, so that a part of the cooled recovered water solution of the third recovery rectifying tower b enters the second polymerization rectifying tower a, and the rest part of the cooled recovered water solution enters the second polymerization rectifying tower b, and provides process water required by rectification for the first polymerization rectifying tower a and the second polymerization rectifying tower b; outlets of the second polymeric rectification tower a, the second polymeric rectification tower b, the first recovery rectification tower a and the first recovery rectification tower b are also communicated with an inlet of a third recovery rectification tower a, so that recovered aqueous solutions of the second polymeric rectification tower a and the second polymeric rectification tower b and residual recovered aqueous solutions of the first recovery rectification tower a and the first recovery rectification tower b are converged into the third recovery rectification tower a; the outlet of the third recovery rectifying tower a is also sequentially communicated with a heat exchanger a and a sewage collecting pool, so that the recovered water solution of the third recovery rectifying tower a enters the sewage collecting pool after heat exchange through the heat exchanger a, and the heat exchanger a is close to a third section energy polymerization tower to provide heat for methanol purification of the third section energy polymerization tower.
2. The serial utilization system of polyvinyl alcohol production process water as claimed in claim 1, wherein the outlet of the first recovery rectifying tower a or the first recovery rectifying tower b is simultaneously communicated with the third recovery rectifying tower a and the third energy-saving polymerization tower.
3. The polyvinyl alcohol production process water cascade utilization system of claim 1, wherein the cooling system is a chiller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021356045.XU CN213950877U (en) | 2020-07-10 | 2020-07-10 | Polyvinyl alcohol production technology water cascade utilizes system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021356045.XU CN213950877U (en) | 2020-07-10 | 2020-07-10 | Polyvinyl alcohol production technology water cascade utilizes system |
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| CN213950877U true CN213950877U (en) | 2021-08-13 |
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| CN202021356045.XU Active CN213950877U (en) | 2020-07-10 | 2020-07-10 | Polyvinyl alcohol production technology water cascade utilizes system |
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