CN216513299U - High COD effluent treatment plant of high salt - Google Patents
High COD effluent treatment plant of high salt Download PDFInfo
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- CN216513299U CN216513299U CN202122882738.3U CN202122882738U CN216513299U CN 216513299 U CN216513299 U CN 216513299U CN 202122882738 U CN202122882738 U CN 202122882738U CN 216513299 U CN216513299 U CN 216513299U
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Abstract
The utility model belongs to the technical field of wastewater treatment, and relates to high-salt high-COD wastewater treatment equipment, which comprises a raw liquid tank, wherein a rectification feed pump is fixedly connected to the raw liquid tank through a pipeline, one end of the rectification feed pump is fixedly connected with a first preheater, the first preheater is fixedly connected with a rectification tower through a pipeline, and the rectification tower is fixedly connected with a reboiler through a pipeline. The high-salt high-COD wastewater treatment equipment and the high-COD wastewater treatment process have the advantages that the MVR evaporation process with remarkable energy-saving effect is adopted, steam is saved, a packed tower with high production capacity, high separation efficiency and small pressure drop is selected for recycling organic products, rectification, MVR evaporation and single-effect evaporation processes are combined for use, the pressure of an MVR system is reduced, vacuum evaporation heating is performed, inner wall scab and scorch are avoided, the device realizes the reduction treatment of wastewater through the combined process of rectification, MVR evaporation and single-effect evaporation, the whole device is reasonable in structure, the use is convenient, and the practicability is strong.
Description
Technical Field
The utility model belongs to the technical field of wastewater treatment, and particularly relates to high-salt high-COD wastewater treatment equipment.
Background
The treatment of high-salt and high-COD wastewater is always a difficult problem in the sewage treatment industry, and mainly the wastewater has the defects of complex composition, high salt content, various organic pollutants, high chroma and suspended matter content and great difficulty in biodegradation treatment.
Most of the high-salt and high-COD wastewater treatment technologies used at present, such as an ozone oxidation method, an electrochemical oxidation method, a Fenton oxidation method and the like, have the defects of complex process, high equipment cost and harsh operating conditions. The ozone oxidation method, the electrochemical oxidation method and the like have the defects of single oxidation condition, large occupied area of equipment, low oxidation efficiency and the like; the Fenton oxidation method has the defects of large medicament input amount, large sludge amount and the like. Therefore, it is necessary to develop a high-efficiency and energy-saving high-salt and high-COD wastewater treatment system and method.
SUMMERY OF THE UTILITY MODEL
To solve the problems set forth in the background art described above. The utility model provides a high-salinity high-COD wastewater treatment device, which solves the technical problems of poor energy-saving effect and low heat utilization efficiency of the traditional device.
In order to achieve the purpose, the utility model provides the following technical scheme: a high-salt high-COD wastewater treatment device comprises a raw liquid tank, wherein a rectification feed pump is fixedly connected onto the raw liquid tank through a pipeline, a first preheater is fixedly connected to one end of the rectification feed pump, a rectification tower is fixedly connected onto the first preheater through a pipeline, a reboiler is fixedly connected onto the rectification tower through a pipeline, a tower kettle pump is fixedly connected onto the rectification tower and the reboiler through pipelines, a cache tank is fixedly connected onto the tower kettle pump through a pipeline, an MVR feed pump is fixedly connected onto the cache tank through a pipeline, a second preheater is fixedly connected onto the MVR feed pump through a pipeline, and an MVR heater is fixedly connected onto the second preheater through a pipeline;
the MVR heater passes through the first separator of pipeline fixedly connected with, the first separator passes through the first discharge pump of pipeline fixedly connected with, the first discharge pump passes through pipeline fixedly connected with stiff ware, the stiff ware passes through pipeline fixedly connected with centrifuge, centrifuge passes through pipeline fixedly connected with mother liquor tank, the mother liquor tank passes through pipeline fixedly connected with mother liquor pump, the mother liquor pump passes through pipeline fixedly connected with third pre-heater, the third pre-heater passes through pipeline fixedly connected with second separator, the second separator passes through pipeline fixedly connected with second condenser, the second condenser passes through pipeline fixedly connected with vapour and liquid separator, vapour and liquid separator passes through pipeline fixedly connected with fresh water storage tank.
As a further scheme of the utility model: the rectifying tower is fixedly connected with a first condenser through a pipeline, the first condenser is fixedly connected with a reflux tank through a pipeline, the reflux tank is fixedly connected with a reflux pump through a pipeline, and the reflux pump is fixedly connected with the rectifying tower through a pipeline.
As a further scheme of the utility model: the MVR heater passes through pipeline fixedly connected with compressor, the compressor passes through pipeline and first separator fixed connection.
As a further scheme of the utility model: the first separator is fixedly connected with a first forced circulation pump through a pipeline, and the first forced circulation pump is fixedly connected with the second preheater and the MVR heater through a pipeline.
As a further scheme of the utility model: the second separator is fixedly connected with a second forced circulation pump through a pipeline, and the second forced circulation pump is fixedly connected with the third preheater and the single-effect heater through pipelines.
As a further scheme of the utility model: the second separator passes through pipeline fixedly connected with second discharge pump, first condenser and second condenser are plate condenser, rectification charge pump, tower cauldron pump, MVR charge pump, MVR discharge pump, mother liquor pump, first discharge pump and second discharge pump are the chemical industry centrifugal pump.
A wastewater treatment process of high-salt high-COD wastewater treatment equipment comprises the following steps:
s1, firstly, preheating feed liquid with high salt and high COD in a raw liquid tank by a first preheater through a rectification feed pump, then conveying the feed liquid into a rectification tower, carrying out efficient mass and heat transfer after the wastewater passes through a filler in the rectification tower, conveying light component COD to the top of the rectification tower, condensing the light component COD through a first condenser, then flowing into a reflux tank, continuously pumping part of condensate in the reflux tank back into the rectification tower by a reflux pump, and discharging part of low boiling point COD out of the system along with the condensate;
s2, heating a shell pass of a reboiler by using raw steam, generating thermosiphon natural circulation with a tower kettle in a tube pass, transferring heat into the tower through circulation liquid at the bottom of the tower, maintaining gas-liquid balance in the rectifying tower, and allowing rectified tower kettle residual liquid to enter a buffer tank through a tower kettle pump and enter a forced circulation evaporation system through an MVR (mechanical vapor recompression) feed pump;
s3, compressing secondary steam from the first separator by a compressor to raise the temperature, and using the compressed secondary steam as a heat source of an MVR heater, wherein the secondary steam is converted into condensed water after being subjected to heat exchange with wastewater by the MVR heater, the temperature is high, in order to effectively utilize heat energy, the condensed water and the wastewater entering the MVR system are cooled to normal temperature and then recycled, feed liquid is continuously circulated in the system by a first forced circulation pump, when the concentration of the feed liquid meets a certain requirement, the concentrated liquid is discharged by a discharge pump and enters a thickener, and the concentration of crystal slurry is increased by utilizing the principle of gravity sedimentation of crystalline particles;
s4, feeding the mother liquor into a centrifuge, a centrifuged salt production system, feeding the centrifuged mother liquor into a mother liquor tank, discharging the mother liquor from the mother liquor pump system into a single-effect evaporation system specially used for treating the mother liquor, and avoiding heavy component COD enrichment in an MVR system;
and S5, finally, using the fresh steam as a heat source of the single-effect heater, enabling the discharged mother liquor to enter the single-effect heater after heat exchange with the fresh steam condensate water through the third preheater, continuously circularly concentrating in the system through the second forced circulation pump, and carrying out secondary evaporation to produce the inorganic salt again.
Compared with the prior art, the utility model has the beneficial effects that:
1. the high-salt high-COD wastewater treatment equipment adopts an MVR evaporation process with obvious energy-saving effect, saves steam, selects a packed tower with large production capacity, high separation efficiency and small pressure drop to recover organic products, combines rectification, MVR evaporation and a single-effect evaporation process to use, reduces the pressure of an MVR system, carries out vacuum evaporation and heating, avoids inner wall scabbing and scorching, is suitable for evaporation of organic matter type heat-sensitive materials, takes comprehensive and complete compressor operation protective measures, achieves the aim of efficient mass and heat transfer after wastewater passes through the packing in the rectification tower by arranging the rectification tower, adopts the form of the packed tower, aims to remove low-boiling-point organic matters in the wastewater, removes low-boiling-point organic matters in the wastewater, leads the operation of the MVR system compressor to be more stable, better solves the problem of high content of COD in evaporated fresh water, and adopts a combined process of rectification, MVR evaporation and single-effect evaporation, the reduction treatment of the waste water is realized, and the whole device has the advantages of reasonable structure, convenient use and strong practicability.
2. This high COD effluent treatment plant of high salt, through first separator work, can be with after the secondary steam that separates improves the temperature through the compressor compression, as the heat source of MVR heater, secondary steam becomes the comdenstion water after MVR heater and waste water heat transfer, the temperature is higher, with the comdenstion water with fall to normal atmospheric temperature after the MVR system waste water heat transfer after recycle, reach the effective utilization to heat energy, the work of mother liquor pump, can carry centrifugal mother liquor to discharge system and get into the single-effect evaporation system who handles mother liquor specially, heavy component COD enrichment in the MVR system is avoided.
3. This high COD effluent treatment plant of high salt, through tower cauldron pump work, can get into the buffer tank through tower cauldron pump with the tower cauldron raffinate that the rectification was distillated, through setting up the forced circulation pump of second, can make the comdenstion water constantly circulate in the system and concentrate, carry out the inorganic salt of secondary evaporation secondary output, through setting up the backwash pump, can continue to beat the rectifying column back in the reflux tank condensate part, rectification charge pump work, can absorb and carry the preheating purpose in reaching the first pre-heater to the feed liquid of the high COD of high salt in the crude tank, through setting up the reboiler, the reboiler shell side utilizes the steam heating, can reach in the tube side and the tower cauldron produce the purpose of siphon natural circulation, through setting up the compressor, you can compress the raising the temperature to steam.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a schematic flow diagram of the system of the present invention;
in the figure: 1. a stock solution tank; 2. a rectification feed pump; 3. a first preheater; 4. a reboiler; 5. a rectifying tower; 6. a first condenser; 7. a reflux tank; 8. a reflux pump; 9. a tower kettle pump; 10. a buffer tank; 11. an MVR feed pump; 12. a second preheater; 13. an MVR heater; 14. a first separator; 15. a compressor; 16. a first forced circulation pump; 17. a first discharge pump; 18. a thickener; 19. a centrifuge; 20. a mother liquor tank; 21. a mother liquor pump; 22. a third preheater; 23. a single-effect heater; 24. a second separator; 25. a second forced circulation pump; 26. a second discharge pump; 27. a second condenser; 28. a gas-liquid separator; 29. a fresh water storage tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1, the present invention provides the following technical solutions: the utility model provides a high COD waste water treatment equipment of high salt, including former liquid tank 1, through pipeline fixedly connected with rectification charge pump 2 on the former liquid tank 1, rectification charge pump 2 work, can absorb and carry to reach the preheating purpose in the first pre-heater 3 to the feed liquid of the high COD of former liquid tank 1 high salt, the first pre-heater 3 of one end fixedly connected with of rectification charge pump 2, first pre-heater 3 passes through pipeline fixedly connected with rectifying column 5, through setting up rectifying column 5, after waste water passes through the interior filler of rectifying column 5, reach the purpose of the mass transfer heat transfer of working up, adopt the packed column form, the purpose is the low boiling point organic matter in the desorption waste water, after dropping the low boiling point organic matter in the waste water, MVR system compressor 15 moves more stably, better solution the problem that COD content is high in the evaporation fresh water.
Rectifying column 5 passes through the first condenser 6 of pipeline fixedly connected with, and first condenser 6 passes through pipeline fixedly connected with reflux tank 7, and reflux tank 7 passes through pipeline fixedly connected with backwash pump 8, through setting up backwash pump 8, can continue to get back rectifying column 5 with the condensate part in reflux tank 7 in, backwash pump 8 passes through pipeline and rectifying column 5 fixed connection.
Rectifying column 5 is through pipeline fixedly connected with reboiler 4, through setting up reboiler 4, 4 shell passes of reboiler utilize raw steam heating, can reach in the tube side and the tower cauldron produce thermosyphon natural circulation's purpose, rectifying column 5 and reboiler 4 are through pipeline fixedly connected with tower cauldron pump 9, tower cauldron pump 9 work, can get into buffer tank 10 through tower cauldron pump 9 with the tower cauldron raffinate that the rectification was distilled off, tower cauldron pump 9 is through pipeline fixedly connected with buffer tank 10, buffer tank 10 is through pipeline fixedly connected with MVR charge pump 11, MVR charge pump 11 is through pipeline fixedly connected with second preheater 12.
The second preheater 12 is fixedly connected with an MVR heater 13 through a pipe. MVR heater 13 passes through pipeline fixedly connected with compressor 15, and through setting up compressor 15, you can compress steam and raise the temperature, and compressor 15 passes through pipeline and first separator 14 fixed connection.
MVR heater 13 passes through the first separator 14 of pipeline fixedly connected with, and first separator 14 work can be with the secondary steam who separates behind the 15 compression raising the temperature of compressor, as MVR heater 13's heat source, secondary steam becomes the comdenstion water behind MVR heater 13 and the waste water heat transfer, and the temperature is higher, falls to normal atmospheric temperature back recycle with the comdenstion water after advancing MVR system waste water heat transfer, reaches the effective utilization to heat energy.
First separator 14 passes through the first discharge pump 17 of pipeline fixedly connected with, and first discharge pump 17 passes through pipeline fixedly connected with stiff ware 18, and stiff ware 18 passes through pipeline fixedly connected with centrifuge 19, and centrifuge 19 passes through pipeline fixedly connected with mother liquor jar 20, and through setting up centrifuge 19 and mother liquor jar 20, mother liquor pump 21 work can carry centrifugal mother liquor to discharge system and get into the single-effect evaporation system who handles mother liquor specially, avoids heavy ends COD enrichment in the MVR system.
Mother liquor jar 20 passes through pipeline fixedly connected with mother liquor pump 21, mother liquor pump 21 passes through pipeline fixedly connected with third pre-heater 22, third pre-heater 22 passes through pipeline fixedly connected with second separator 24, second separator 24 passes through pipeline fixedly connected with second condenser 27, second condenser 27 passes through pipeline fixedly connected with vapour and liquid separator 28, vapour and liquid separator 28 passes through pipeline fixedly connected with fresh water storage tank 29, the device adopts the rectification, the MVR evaporation, the combination process of single effect evaporation, realize the minimizing of waste water and handle, whole device is rational in infrastructure, high durability and convenient use, therefore, the clothes hanger is strong in practicability.
Specifically, the first separator 14 is fixedly connected with a first forced circulation pump 16 through a pipeline, and the first forced circulation pump 16 is fixedly connected with the second preheater 12 and the MVR heater 13 through pipelines.
Specifically, second separator 24 passes through pipeline fixedly connected with second force circulation pump 25, and second force circulation pump 25 passes through pipeline fixed connection with third pre-heater 22 and single-effect heater 23, through setting up second force circulation pump 25, can make the continuous circulation of comdenstion water in the system concentrate, carries out the inorganic salt of secondary evaporation output once more.
Specifically, the second separator 24 is fixedly connected with a second discharge pump 26 through a pipeline, the first condenser 6 and the second condenser 27 are plate condensers, and the rectification feed pump 2, the tower kettle pump 9, the MVR feed pump 11, the MVR discharge pump, the mother liquor pump 21, the first discharge pump 17 and the second discharge pump 26 are chemical centrifugal pumps.
A wastewater treatment process of high-salt high-COD wastewater treatment equipment comprises the following steps:
s1, firstly, preheating feed liquid with high salt and high COD in a raw liquid tank 1 through a first preheater 3 by a rectification feed pump 2, then conveying the feed liquid into a rectification tower 5, carrying out efficient mass and heat transfer after wastewater passes through a filler in the rectification tower 5, wherein a light component COD goes to the top of the rectification tower 5, the light component COD is condensed by a first condenser 6 and then flows into a reflux tank 7, a condensate part in the reflux tank 7 is continuously pumped back into the rectification tower 5 by a reflux pump 8, and a part of low boiling point COD is discharged out of the system along with condensate;
s2, heating a shell pass of the reboiler 4 by using raw steam, generating thermosiphon natural circulation with a tower kettle in a tube pass, transferring heat into the tower through circulation liquid at the bottom of the kettle, maintaining gas-liquid balance in the rectifying tower 5, and allowing rectified tower kettle residual liquid to enter a buffer tank 10 through a tower kettle pump 9 and enter a forced circulation evaporation system through an MVR (mechanical vapor recompression) feed pump 11;
s3, compressing secondary steam from the first separator 14 by a compressor 15 to raise the temperature, and using the compressed secondary steam as a heat source of the MVR heater 13, wherein the secondary steam is converted into condensed water after being subjected to heat exchange with wastewater by the MVR heater 13, the temperature is high, in order to effectively utilize heat energy, the condensed water is cooled to normal temperature after being subjected to heat exchange with wastewater entering the MVR system and then recycled, feed liquid is continuously circulated in the system by a first forced circulation pump 16, when the concentration of the feed liquid meets a certain requirement, the concentrated liquid is discharged by a discharge pump to enter a thickener 18, and the concentration of crystal mush is increased by utilizing the principle of gravity settling of crystal particles;
s4, feeding the mother liquor into a centrifuge 19, a salt production system after centrifugation, feeding the centrifuged mother liquor into a mother liquor tank 20, discharging the mother liquor from the system through a mother liquor pump 21, and feeding the mother liquor into a single-effect evaporation system specially used for treating the mother liquor, thereby avoiding heavy component COD enrichment in an MVR system;
and S5, finally, using the fresh steam as a heat source of the single-effect heater 23, enabling the discharged mother liquor to enter the single-effect heater 23 after heat exchange between the third preheater 22 and the fresh steam condensate water, continuously circulating and concentrating in the system through the second forced circulation pump 25, and performing secondary evaporation to produce the inorganic salt again.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.
In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.
Claims (6)
1. The utility model provides a high COD effluent treatment plant of high salt, includes former feed liquor jar (1), its characterized in that: a rectification feed pump (2) is fixedly connected onto the raw liquid tank (1) through a pipeline, a first preheater (3) is fixedly connected to one end of the rectification feed pump (2), a rectification tower (5) is fixedly connected onto the first preheater (3) through a pipeline, a reboiler (4) is fixedly connected onto the rectification tower (5) through a pipeline, a tower kettle pump (9) is fixedly connected onto the rectification tower (5) and the reboiler (4) through a pipeline, a buffer tank (10) is fixedly connected onto the tower kettle pump (9) through a pipeline, an MVR feed pump (11) is fixedly connected onto the buffer tank (10) through a pipeline, a second preheater (12) is fixedly connected onto the MVR feed pump (11) through a pipeline, and an MVR heater (13) is fixedly connected onto the second preheater (12) through a pipeline;
the MVR heater (13) is fixedly connected with a first separator (14) through a pipeline, the first separator (14) is fixedly connected with a first discharging pump (17) through a pipeline, the first discharging pump (17) is fixedly connected with a thickener (18) through a pipeline, the thickener (18) is fixedly connected with a centrifugal machine (19) through a pipeline, the centrifugal machine (19) is fixedly connected with a mother liquor tank (20) through a pipeline, the mother liquor tank (20) is fixedly connected with a mother liquor pump (21) through a pipeline, the mother liquor pump (21) is fixedly connected with a third preheater (22) through a pipeline, the third preheater (22) is fixedly connected with a second separator (24) through a pipeline, the second separator (24) is fixedly connected with a second condenser (27) through a pipeline, and the second condenser (27) is fixedly connected with a gas-liquid separator (28) through a pipeline, the gas-liquid separator (28) is fixedly connected with a fresh water storage tank (29) through a pipeline.
2. The high-salt high-COD wastewater treatment equipment according to claim 1, characterized in that: rectifying column (5) are through pipeline fixedly connected with first condenser (6), first condenser (6) are through pipeline fixedly connected with reflux drum (7), reflux drum (7) are through pipeline fixedly connected with backwash pump (8), backwash pump (8) are through pipeline and rectifying column (5) fixed connection.
3. The high-salt high-COD wastewater treatment equipment according to claim 1, characterized in that: MVR heater (13) pass through pipeline fixedly connected with compressor (15), compressor (15) pass through pipeline and first separator (14) fixed connection.
4. The high-salt high-COD wastewater treatment equipment according to claim 1, characterized in that: the first separator (14) is fixedly connected with a first forced circulation pump (16) through a pipeline, and the first forced circulation pump (16) is fixedly connected with the second preheater (12) and the MVR heater (13) through pipelines.
5. The high-salt high-COD wastewater treatment equipment according to claim 1, characterized in that: the second separator (24) is fixedly connected with a second forced circulation pump (25) through a pipeline, and the second forced circulation pump (25) is fixedly connected with the third preheater (22) and the single-effect heater (23) through pipelines.
6. The high-salt high-COD wastewater treatment equipment according to claim 2, characterized in that: second separator (24) are through pipeline fixedly connected with second discharge pump (26), first condenser (6) and second condenser (27) are plate condenser, rectification charge pump (2), tower cauldron pump (9), MVR charge pump (11), MVR discharge pump, mother liquor pump (21), first discharge pump (17) and second discharge pump (26) are the chemical centrifugal pump.
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| CN202122882738.3U CN216513299U (en) | 2021-11-23 | 2021-11-23 | High COD effluent treatment plant of high salt |
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| CN114044600A (en) * | 2021-11-23 | 2022-02-15 | 青岛康景辉环境科技集团有限公司 | High-salt high-COD wastewater treatment equipment and process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114044600A (en) * | 2021-11-23 | 2022-02-15 | 青岛康景辉环境科技集团有限公司 | High-salt high-COD wastewater treatment equipment and process |
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