CN216236372U - Centrifugal mother liquor deep separation processing system - Google Patents
Centrifugal mother liquor deep separation processing system Download PDFInfo
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- CN216236372U CN216236372U CN202122221522.2U CN202122221522U CN216236372U CN 216236372 U CN216236372 U CN 216236372U CN 202122221522 U CN202122221522 U CN 202122221522U CN 216236372 U CN216236372 U CN 216236372U
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Abstract
The utility model discloses a centrifugal mother liquor deep separation treatment system, which comprises a pretreatment system, an oxidation reaction system, a tail gas digestion and removal system, a filtration system and an ultrafiltration system which are sequentially connected; the pretreatment system comprises an aging tank, a sand filtration tower and a sterilization tank which are connected in sequence; the oxidation reaction system comprises two oxidation reactors connected in series, the two oxidation reactors are a first oxidation reactor and a second oxidation reactor respectively, the first oxidation reactor is connected with the sterilization tank, the first oxidation reactor and the second oxidation reactor are connected with an ozone generating device, and the top of the second oxidation reactor is provided with a separation tower; a spray header is arranged in the separation tower, a circulating pipe is connected to the spray header, the tail end of the circulating pipe is connected with the bottom of the second oxidation reactor, and a circulating pump is connected to the circulating pipe; the top of the separation tower is connected with an induced draft pipe, a removal induced draft fan and an emptying pipe; filtration systems and ultrafiltration systems are used to filter impurities in the effluent liquid.
Description
Technical Field
The utility model belongs to the technical field of chemical production equipment, and particularly relates to a centrifugal mother liquor deep separation treatment system.
Background
In the industry, in the polyvinyl chloride drying production process, the centrifugal mother liquor wastewater discharged by a centrifugal machine contains a large amount of PVC particles and the residues of organic auxiliaries, and the supernatant of the wastewater is only a small amount of the supernatant of the wastewater which can be used as flushing water for a part of slurry pipelines, but the final direction of the wastewater in the industry is not completely solved.
In the actual production process, a plurality of enterprises directly use the wastewater after biochemical treatment as the water supplement of a circulating water system, but because a large amount of bacteria and microorganisms are brought in the biochemical treatment process, the temperature of the circulating water is more beneficial to the reproduction of the microorganisms and the bacteria, if a large amount of bactericide is added, the chlorine roots of the circulating water system exceed the standard, the water quality of the circulating water system is disordered, the replacement quantity needs to be increased, the use effect is poor, if the bactericide is added less, the pitting corrosion of heat exchange equipment is serious, the service life of the heat exchange equipment is shortened, and the production of the system is influenced. Meanwhile, a plurality of enterprises try to use the polymer feed into kettle water after simple treatment, but organic matters contained in the wastewater are not thoroughly treated, so that severe blockage of ultrafiltration, reverse osmosis and mixed beds is caused, and finally failure is caused.
The centrifugal mother liquor deep treatment process is characterized by that in the course of polyvinyl chloride production, the centrifugal mother liquor discharged from drying centrifugal machine, the stripping waste water discharged from waste water stripping and all the positions of polyvinyl chloride production are collected, and uniformly fed into the centrifugal mother liquor to make treatment, and after the biochemical treatment of said centrifugal mother liquor is completed, said centrifugal mother liquor is directly fed into secondary reverse osmosis and mixed bed of desalted water production process to obtain the invented product which meets the requirements for adding polymerization material into kettle. And the ultrafiltration and secondary reverse osmosis concentrated water are completely recycled, so that zero discharge of the waste water in the polyvinyl chloride production is realized.
The centrifugal mother liquor advanced treatment process is characterized in that a strong oxidant and a high-efficiency catalyst are reasonably utilized, COD (chemical oxygen demand) in the centrifugal mother liquor organic wastewater is thoroughly reduced to be within 10PPm, a powerful guarantee is provided for a subsequent water production system, the service life of each device of the water production system is prolonged, the water production cost of desalted water is reduced, concentrated water is reasonably recycled, energy conservation and emission reduction are realized, and the production cost is saved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a centrifugal mother liquor deep separation treatment system, and aims to solve the technical problem.
Therefore, the utility model adopts the following technical scheme:
a centrifugal mother liquor deep separation treatment system comprises a pretreatment system, an oxidation reaction system, a tail gas digestion and removal system, a filtration system and an ultrafiltration system which are sequentially connected;
the pretreatment system comprises an aging tank, a sand filtration tower and a sterilization tank which are connected in sequence;
the oxidation reaction system comprises two oxidation reactors connected in series, the two oxidation reactors are a first oxidation reactor and a second oxidation reactor respectively, the first oxidation reactor is connected with the sterilization tank, the first oxidation reactor and the second oxidation reactor are connected with an ozone generating device, and the top of the second oxidation reactor is provided with a separation tower; a spray header is arranged in the separation tower, a circulating pipe is connected to the spray header, the tail end of the circulating pipe is connected with the bottom of the second oxidation reactor, and a circulating pump is connected to the circulating pipe; the top of the separation tower is connected with an induced draft pipe, a removal induced draft fan and an emptying pipe;
the tail gas digestion and elimination system is connected to the second oxidation reactor and is used for separating ozone gas mixed in liquid discharged by the second oxidation reactor;
the filtration system and ultrafiltration system are used to filter impurities in the discharge liquid.
Further, the first oxidation reactor comprises a reactor body, a water distributor is arranged at the bottom in the reactor body, and a spray head is arranged on the water distributor; a catalytic component is arranged above the water distributor.
The tail gas digestion and elimination system comprises a digestion and elimination tank and a degassing blower, wherein a vertical gas inlet pipe is arranged in the digestion and elimination tank, the top end of the gas inlet pipe is connected with the degassing blower, the bottom end of the gas inlet pipe is connected with a distributor, a catalytic assembly is arranged above the distributor, and the top of the digestion and elimination tank is connected with a separation tower through a pipeline;
the upper part in the digestion and elimination tank is provided with a spray header, and the outlet of the second oxidation reactor is connected with the spray header through a pipeline.
Furthermore, a concentrated water outlet and a medicament inlet are arranged on the ultrafiltration system, and the concentrated water outlet is connected with the sterilization tank through a pipeline.
Furthermore, the tail part of the ultrafiltration system is also connected with an ultrafiltration water buffer tank, and the ultrafiltration water buffer tank is connected with an ultrafiltration water delivery pump.
Furthermore, an oxygen inlet, a nitrogen inlet, a circulating water inlet and a circulating water outlet are arranged on the ozone generating device.
The utility model has the beneficial effects that:
the treatment of the system flow can ensure the smooth proceeding of the subsequent process, and ensure that a second-stage reverse osmosis membrane pipe of the water making system is not blocked by dirt, the regeneration time of a mixed bed can be effectively prolonged to reach the advanced level of the industry, and desalted water with the conductivity less than 1us/cm can be prepared and directly supplied to a polymerization kettle for feeding, all the concentrated water generated in the process is recycled, the zero discharge of waste water is realized, the PLC centralized control is realized in the whole process, the operation can be directly communicated to the DCS, the key technical problems of membrane fouling blockage, frequent replacement and high water making cost in the advanced treatment process of the centrifugal mother liquor are solved, and the process that the centrifugal mother liquor cannot be directly recycled to the polymerization kettle for feeding after the treatment of the centrifugal mother liquor waste water in the industry has a new breakthrough.
Drawings
FIG. 1 is a process flow diagram of the present invention;
in the figure: 1-an aging tank, 2-a sand filtration tower, 3-a sterilization tank, 4-a first oxidation reactor, 5-a second oxidation reactor, 6-a separation tower, 7-an ozone generating device, 8-a digestion and removal tank, 9-a filtration system, 10-an ultrafiltration system and 11-an ultrafiltration water buffer tank.
Detailed Description
The utility model will be further described with reference to the accompanying drawings in which:
as shown in fig. 1, a centrifugal mother liquor deep separation treatment system comprises a pretreatment system, an oxidation reaction system, a tail gas digestion and removal system, a filtration system 9 and an ultrafiltration system 10 which are connected in sequence.
The pretreatment system comprises an aging tank 1, a sand filter tower 2 and a sterilization tank 3 which are connected in sequence, wherein centrifugal mother liquor discharged by a drying centrifuge, stripping wastewater discharged by wastewater stripping and ground washing water of each post (polymerization, stripping, drying and recovery units) in polyvinyl chloride production are collected and uniformly enter the aging tank 1, and after biochemical treatment of the centrifugal mother liquor, the centrifugal mother liquor is conveyed to the sand filter tower 2 by a submerged pump for primary impurity filtration and then enters the sterilization tank 3.
The oxidation reaction system comprises two oxidation reactors connected in series, the two oxidation reactors are a first oxidation reactor 4 and a second oxidation reactor 5 from front to back respectively, the first oxidation reactor 4 is connected with the sterilization tank 3, the first oxidation reactor 4 and the second oxidation reactor 5 are connected with an ozone generating device 7, and the ozone generating device 7 is used for introducing ozone into the first oxidation reactor 4 and the second oxidation reactor 5. A separation tower 6 is arranged at the top of the second oxidation reactor 5, a spray header is arranged in the separation tower 6, the spray header is connected with a circulating pipe, the tail end of the circulating pipe is connected with the bottom of the second oxidation reactor 5, and the circulating pipe is also connected with a circulating pump; the top of the separation tower 6 is connected with an induced draft pipe, a removal induced draft fan and an emptying pipe, and gas separated from liquid is discharged through the emptying pipe. The ozone generating device 7 is provided with an oxygen inlet, a nitrogen inlet, a circulating water inlet and a circulating water outlet.
The first oxidation reactor 4 comprises a reactor body, a water distributor is arranged at the bottom in the reactor body, a spray head is arranged on the water distributor, a catalytic assembly is arranged above the water distributor and can catalyze the ozonolysis, and the second oxidation reactor 5 has the same structure as the first oxidation reactor 4.
The tail gas digestion and removal system is connected to the second oxidation reactor 5 and used for separating residual gas mixed in liquid discharged from the second oxidation reactor 5. The tail gas digestion and removal system comprises a digestion and removal tank 8 and a degassing air blower, wherein a vertical air inlet pipe is arranged in the digestion and removal tank 8, the top end of the air inlet pipe is connected with the degassing air blower, the bottom end of the air inlet pipe is connected with a distributor, a catalytic assembly is arranged above the distributor, and the top of the digestion and removal tank 8 is connected with a separation tower 6 through a pipeline. The upper part in the digestion and elimination tank 8 is provided with a spray header, and the outlet of the second oxidation reactor 5 is connected with the spray header through a pipeline.
The filtration system 9 and the ultrafiltration system 10 are used for filtering impurities in the discharged liquid. The ultrafiltration system 10 is provided with a concentrated water outlet and a medicament inlet, and the concentrated water outlet is connected with the sterilization tank 3 through a pipeline. The tail part of the ultrafiltration system 10 is also connected with an ultrafiltration water buffer tank 11, and the ultrafiltration water buffer tank 11 is connected with an ultrafiltration water delivery pump.
The working principle of the utility model is as follows:
the centrifugal mother liquor enters an aging tank 1 in the centrifugal mother liquor wastewater pretreatment after the biochemical treatment is finished, when the liquid level of the aging tank 1 reaches more than 65%, a submerged pump is started to send the centrifugal mother liquor to a sand filter tower 2 for primary impurity filtration, the filtered centrifugal mother liquor enters a sterilization tank 3 in the centrifugal mother liquor wastewater pretreatment, and when the liquid level of the sterilization tank 3 reaches more than 65%, the submerged pump of the sterilization tank 3 is started to send the centrifugal mother liquor to a water distributor at the bottom of a first oxidation reactor 4.
Water in the first oxidation reactor 4 overflows into a water distributor at the bottom of a second oxidation reactor 5 through a pipeline, centrifugal mother liquor in the second oxidation reactor 5 finally overflows to a digestion and elimination tank 8 through a spray head, when the liquid level in the digestion and elimination tank 8 begins to rise, a removal induced draft fan is started, an ozone generating device 7 in the second oxidation reactor 5 is started, a degassing blower is started, an emptying valve of the degassing blower is slowly adjusted until the pressure of the digestion and elimination tank 8 is preferably-1 to-3 KPa; when the liquid level of the digestion and removal tank 8 reaches 55%, the ultrafiltration system 10 is automatically started, the ultrafiltration water inlet pump is automatically started, the ultrafiltration starts to operate, when the liquid level in the ultrafiltration water buffer tank 11 reaches 55%, the secondary reverse osmosis system is automatically started, the secondary reverse osmosis water inlet pump is automatically started, and the mixed bed system waits after being automatically started.
When the liquid level of the concentrated water of the ultrafiltration system 10, the secondary reverse osmosis system and the mixed bed system rises to 45 percent, the recovery water pump is automatically started and sent into a lower water tank of the circulating water tower, and the system is normally driven.
If the system stops in winter, heat preservation and anti-freezing work needs to be done, outdoor water pipes need to be emptied and exhausted, and regulating valves and hand valves of heat exchange media of coolers are closed.
The treatment of the process flow can ensure the smooth proceeding of the subsequent process, and ensure that a second-stage reverse osmosis membrane pipe of a water making system is not blocked by dirt, the regeneration time of a mixed bed can be effectively prolonged to reach the advanced level of the industry, and desalted water with the conductivity less than 1us/cm can be prepared and directly supplied to a polymerization kettle for feeding, all the concentrated water generated in the process is recycled, the zero discharge of waste water is realized, the PLC centralized control in the whole process can be realized, the operation can be directly communicated to the DCS, the key technical problems of membrane fouling blockage, frequent replacement and high water making cost in the advanced treatment process of the centrifugal mother liquor are solved, and the process that the centrifugal mother liquor cannot be directly recycled to the polymerization kettle for feeding after the treatment of the centrifugal mother liquor waste water in the industry has a new breakthrough.
It should be noted that the above are only some embodiments of the present invention, and it should be noted that, for those skilled in the art, many modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (6)
1. A centrifugal mother liquor deep separation treatment system is characterized by comprising a pretreatment system, an oxidation reaction system, a tail gas digestion and removal system, a filtering system (9) and an ultrafiltration system (10) which are sequentially connected;
the pretreatment system comprises an aging tank (1), a sand filtration tower (2) and a sterilization tank (3) which are connected in sequence;
the oxidation reaction system comprises two oxidation reactors connected in series, the two oxidation reactors are respectively a first oxidation reactor (4) and a second oxidation reactor (5), the first oxidation reactor (4) is connected with the sterilization tank (3), the first oxidation reactor (4) and the second oxidation reactor (5) are connected with an ozone generating device (7), and the top of the second oxidation reactor (5) is provided with a separation tower (6); a spray header is arranged in the separation tower (6), a circulating pipe is connected to the spray header, the tail end of the circulating pipe is connected with the bottom of the second oxidation reactor (5), and a circulating pump is connected to the circulating pipe; the top of the separation tower (6) is connected with an induced draft pipe, a removal induced draft fan and an emptying pipe;
the tail gas digestion and elimination system is connected to the second oxidation reactor (5) and is used for separating ozone gas mixed in liquid discharged by the second oxidation reactor (5);
the filtration system (9) and the ultrafiltration system (10) are used for filtering impurities in the discharged liquid.
2. The centrifugal mother liquor deep separation treatment system according to claim 1, wherein the first oxidation reactor (4) comprises a reactor body, a water distributor is arranged at the bottom in the reactor body, and a spray head is arranged on the water distributor; a catalytic component is arranged above the water distributor.
3. The centrifugal mother liquor deep separation treatment system according to claim 1, wherein the tail gas digestion and removal system comprises a digestion and removal tank (8) and a degassing blower, a vertical gas inlet pipe is arranged in the digestion and removal tank (8), the top end of the gas inlet pipe is connected with the degassing blower, the bottom end of the gas inlet pipe is connected with a distributor, a catalytic assembly is arranged above the distributor, and the top of the digestion and removal tank (8) is connected with a separation tower (6) through a pipeline;
the upper part in the digestion and removal tank (8) is provided with a spray header, and the outlet of the second oxidation reactor (5) is connected with the spray header through a pipeline.
4. The centrifugal mother liquor deep separation treatment system according to claim 1, wherein a concentrated water outlet and a medicament inlet are arranged on the ultrafiltration system (10), and the concentrated water outlet is connected with the sterilization tank (3) through a pipeline.
5. The centrifugal mother liquor deep separation treatment system according to claim 4, characterized in that an ultrafiltration water buffer tank (11) is further connected to the tail part of the ultrafiltration system (10), and an ultrafiltration water delivery pump is connected to the ultrafiltration water buffer tank (11).
6. The centrifugal mother liquor deep separation treatment system according to claim 1, wherein the ozone generating device (7) is provided with an oxygen inlet, a nitrogen inlet, a circulating water inlet and a circulating water outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122221522.2U CN216236372U (en) | 2021-09-14 | 2021-09-14 | Centrifugal mother liquor deep separation processing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122221522.2U CN216236372U (en) | 2021-09-14 | 2021-09-14 | Centrifugal mother liquor deep separation processing system |
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| Publication Number | Publication Date |
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| CN216236372U true CN216236372U (en) | 2022-04-08 |
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| CN202122221522.2U Active CN216236372U (en) | 2021-09-14 | 2021-09-14 | Centrifugal mother liquor deep separation processing system |
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2021
- 2021-09-14 CN CN202122221522.2U patent/CN216236372U/en active Active
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