CN218860369U - Miscellaneous salt mother liquor mummification processing system - Google Patents
Miscellaneous salt mother liquor mummification processing system Download PDFInfo
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- CN218860369U CN218860369U CN202223287396.1U CN202223287396U CN218860369U CN 218860369 U CN218860369 U CN 218860369U CN 202223287396 U CN202223287396 U CN 202223287396U CN 218860369 U CN218860369 U CN 218860369U
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Abstract
The utility model provides a miscellaneous salt mother liquor mummification processing system, which comprises a film evaporator, a separation device, a first condenser, a second condenser, a rectification device, a vacuum device and a tail liquor mummification device; the thin film evaporator is used for converting the miscellaneous salt mother liquor into steam and viscous mother liquor, the first condenser is used for condensing the steam into condensate water, the condensate water is introduced into a rectifying tower of a rectifying device, the rectifying tower is used for rectifying the condensate water to generate steam containing organic matters and tower bottoms, the second condenser is used for condensing the steam containing the organic matters into organic solution, and the organic solution flows back to the rectifying tower for rectification and/or discharge and collection again; the separation device is used for carrying out solid-liquid separation on the viscous mother liquor to obtain mixed salt solid and centrifugal mother liquor; the tail liquid drying device is used for drying the centrifugal mother liquid; the vacuum device is used for pumping out non-condensable gas in the thin film evaporator, the first condenser, the second condenser and the rectifying device.
Description
Technical Field
The utility model relates to a waste water treatment field, especially a miscellaneous salt mother liquor mummification processing system.
Background
In recent years, for the survival and long-term development of enterprises, the zero-emission water treatment process is adopted for wastewater discharged in the production process of enterprises in the industries such as coal chemical industry, petrochemical industry, fine chemical industry, metallurgy, pharmacy, printing and dyeing, papermaking and the like. The 'zero-emission' water treatment process mainly comprises 3 main treatment processes of pretreatment, advanced treatment, concentrated water evaporation crystallization and the like, wherein the common treatment processes of concentrated water evaporation crystallization are triple effect evaporation crystallization and MVR evaporation crystallization. No matter the triple effect evaporation crystallization process or the MVR evaporation crystallization process is adopted, when sodium chloride or sodium sulfate crystallized salt products meeting the requirements are produced, a certain amount of mixed salt mother liquor is discharged, the mother liquor has the characteristics of high salt content and high COD (chemical oxygen demand), the salt content is generally more than 100000mg/L, the COD concentration is more than 10000mg/L, and sodium chloride or sodium sulfate crystallized salt solid particles are also mixed.
At present, the common treatment method for the mixed salt mother liquor is drying treatment by using single drying equipment, such as roller drying, spray drying, rake drying, microwave drying, single cone drying equipment and the like. The single drying equipment has the advantages of thoroughly realizing the drying treatment of the mixed salt mother liquor and really realizing the zero emission of the tail end treatment of the wastewater, but has the greatest defect of small treatment capacity (the water quantity is generally not more than 1 m) 3 H) narrow COD adaptation range (only applicable to the mixed salt mother liquor containing the difficultly volatile COD component). In the 'zero discharge' process of water treatment in various industries, particularly petrochemical enterprises, the amount of the produced miscellaneous salt mother liquor is up to 5m 3 And the COD in the mother liquor is mostly volatile components, and the conventional single drying equipment cannot economically and effectively dry the mixed salt mother liquor. Therefore, the process and the method which can treat a large amount of water, have a wide COD application range, are economical and practical and are easy to operate, and have important application value for drying the mixed salt mother liquor which has different water amounts and different COD types and is generated by the current zero emission process of water treatment in various industries.
Therefore, the utility model is especially provided.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a miscellaneous salt mother liquor mummification processing system to high salt, high COD miscellaneous salt mother liquor are handled to high efficiency.
The utility model discloses a realize above-mentioned purpose, the technical scheme of adoption as follows:
the utility model provides a drying treatment system for miscellaneous salt mother liquor, which comprises a film evaporator, a separation device, a first condenser, a second condenser, a rectification device, a vacuum device and a tail liquor drying device;
the thin film evaporator is used for processing the miscellaneous salt mother liquor and converting the miscellaneous salt mother liquor into steam and viscous mother liquor in an evaporation mode, the first condenser is used for condensing the steam generated by the thin film evaporator into condensate water and conveying the condensate water into a rectifying tower of the rectifying device, the rectifying tower is used for rectifying the condensate water to generate steam containing organic matters and tower bottoms, the second condenser is used for condensing the steam containing the organic matters generated by rectifying the rectifying tower into organic solution, and the organic solution is refluxed to the rectifying tower to be rectified again and/or discharged and collected;
the separation device is used for carrying out solid-liquid separation on the viscous mother liquor generated by the thin film evaporator to obtain mixed salt solid and centrifugal mother liquor;
the tail liquid drying device is used for drying the centrifugal mother liquid generated by the separation device;
the vacuum device is used for pumping out non-condensable gas in the thin film evaporator, the first condenser, the second condenser and the rectifying device.
Preferably or optionally, the thin film evaporator is a wiped film evaporator.
Preferably or optionally, the wiped film evaporator is a two stage wiped film evaporator.
Preferably or optionally, the wiped film evaporator is further provided with an external vapor-liquid separator.
Preferably or optionally, the separation device is a centrifugal separation device.
Preferably or optionally, the tail liquid drying device is one or more of a roller drying device, a spray drying device, a rake drying device, a microwave drying device and a single cone drying device.
Preferably or optionally, a mother liquor tank is arranged between the scraper film evaporator and the separation device.
Preferably or alternatively, the mother liquor tank is a jacketed tank or a reaction kettle.
Preferably or optionally, a tail liquid mother liquor tank is arranged between the separation device and the tail liquid drying device.
Advantageous effects
The utility model provides a miscellaneous salt mother liquor mummification processing system has solved the mummification problem that the water treatment "zero release" technology evaporation crystallization device produced miscellaneous salt mother liquor, does not receive miscellaneous salt mother liquor water volume size, COD component difficult volatile whether, contain the condition restriction such as salt content height, and the range of application is wide; no chemical agent is added during operation, the mass and heat transfer efficiency is high, the operation cost is low, the equipment investment is small, and the device can stably operate for a long time.
Drawings
FIG. 1 is a schematic view of a drying treatment system for a mother solution of miscellaneous salts according to the first embodiment.
Detailed Description
To facilitate understanding of the present invention, the present invention will be described more fully and meticulously with reference to the drawings and preferred examples, but the scope of the present invention is not limited to the following specific examples.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Example one
The embodiment of the utility model provides miscellaneous salt mother liquor mummification processing system, as shown in figure 1, this set of miscellaneous salt mother liquor mummification processing system links to each other with the export of miscellaneous salt mother liquor in boundary area, including at least one-level scraper blade film evaporator, separator, first condenser, second condenser, rectifier unit, vacuum apparatus and tail-liquor mummification device.
And conveying the mixed salt mother liquor generated in the boundary area by a pump, introducing the mixed salt mother liquor into a heat exchanger of a rectifying tower kettle of a rectifying device for preheating, and introducing the preheated mixed salt mother liquor into a scraper film evaporator.
In this embodiment, the wiped film evaporator is a two-stage wiped film evaporator, and the specific number of stages can be determined by those skilled in the art according to the amount of water of the miscellaneous salt mother liquor to be treated in the actual process.
The mixed salt mother liquor is uniformly arranged on the heating surface of the scraper film evaporator to form a liquid film, steam and viscous mother liquor mixed with crystal salt particles are generated through heating and evaporation, and the viscous mother liquor is collected by a mother liquor tank and then is conveyed into a centrifugal separation device.
In this example, the wiped film evaporator was heated using raw steam introduced into the battery compartment.
The separation device carries out solid-liquid separation on the viscous mother liquor in a centrifugal mode, the separated mixed salt solid is directly packaged and then transported outside for harmless treatment, and the separated centrifugal mother liquor is collected in a tail liquor mother liquor tank (not shown in the figure) in a centralized manner and then is conveyed to a tail liquor drying device.
The centrifugal mother liquor is thoroughly dried in a tail liquor drying device, and the produced miscellaneous salt solid is packaged and then transported outside for harmless treatment. In this embodiment, the tail liquid drying device is one or a combination of multiple kinds of drum drying equipment, spray drying equipment, rake drying equipment, microwave drying equipment and single-cone drying equipment.
Steam generated by the scraper film evaporator is condensed by a first condenser to obtain condensed water, the condensed water is conveyed to a rectifying tower for rectification to remove organic matters, the condensed water is subjected to gas-liquid exchange in the middle of the rectifying tower through a tower plate, volatile organic matters and water are separated, the volatile organic matters move upwards in the rectifying tower and are collected at the top of the tower, the condensed water is condensed and converted into an organic solution enriched with a large number of volatile organic matter components by a second condenser, the organic solution is returned to the rectifying tower by a pump to be mixed with the condensed water for rectification again, or a small amount of the organic solution is cooled and conveyed to a storage tank for centralized treatment.
The residual water and the organic matters which are difficult to volatilize in the rectifying tower downwards and are gathered at the bottom of the rectifying tower, and are discharged for subsequent treatment after being cooled by a heat exchanger (synchronously preheated wastewater) at the tower kettle of the rectifying tower.
As a feasible treatment mode, the tower bottom liquid can be conveyed to a biochemical pond to carry out biochemical treatment to remove partial organic matters, then the turbidity and the organic matter content are reduced through sludge sedimentation, coagulant addition and sedimentation, oxidation treatment, and ultrafiltration and reverse osmosis treatment are carried out to obtain reverse osmosis produced water with the water quality meeting the water quality requirement of reuse water.
However, it should be noted that the present invention is not limited to the treatment method of the tower bottoms, and those skilled in the art can select a suitable treatment method of the tower bottoms according to actual needs.
The vacuum device is used for pumping out the non-condensable gas in the plate film evaporator, the first condenser, the second condenser and the rectifying device, and in the embodiment, non-condensable gas pipelines of the three devices are communicated to form a non-condensable gas pipeline system.
Example 2
The drying treatment system for the miscellaneous salt mother liquor provided in example 1 is described in detail below with reference to specific process parameters.
In this embodiment, the salt content of the mixed salt mother liquor is not less than 100000mg/L, and the COD concentration is not less than 10000mg/L.
Conveying the mixed salt mother liquor from the boundary area by a pump, introducing the mixed salt mother liquor into a heat exchanger of a rectifying tower kettle of a rectifying device for preheating, and introducing the mixed salt mother liquor into a two-stage scraper film evaporator after preheating to 60-65 ℃.
The mixed salt mother liquor is distributed in a scraper film evaporator, and steam generated by evaporation after forced film formation is condensed into condensed water by a first condenser, and the condensed water is introduced into a rectifying tower to be rectified to remove organic matters.
In the embodiment, the scraper film evaporator is also provided with the external vapor-liquid separator, so that liquid drops contained in the steam generated by the scraper film evaporator can be effectively separated, the phenomenon of entrainment of vapor and liquid is prevented, and the treatment efficiency of the evaporator is improved.
In this example, the wiped film evaporator was operated at a temperature of 80 to 110 ℃ and an operating pressure (gauge pressure) of-85.0 to 0.0KPa.
The condensed water is subjected to gas-liquid exchange in the middle of the rectifying tower through a tower plate, the volatile organic matters and water are separated, the volatile organic matters move upwards in the rectifying tower to form organic matter-containing steam which is collected at the top of the tower and condensed and converted into organic solution enriched with a large amount of volatile organic matter components through a second condenser, and the organic solution is returned to the rectifying tower by a pump for rectification again or is discharged, collected and concentrated for harmless treatment after being cooled.
In the embodiment, the operating temperature of the rectifying tower is 60-100 ℃, the operating pressure (gauge pressure) is-85.0-0.0 kPa, and the separation efficiency of the rectifying tower is more than or equal to 90%.
The residual water and a small amount of organic matters which are difficult to volatilize in the rectifying tower downwards and are gathered at the bottom of the rectifying tower to form tower bottom liquid, and the tower bottom liquid is discharged for subsequent treatment after being cooled by a heat exchanger (synchronously preheating waste water) of the tower bottom of the rectifying tower.
At the moment, the water quality of the tower bottom liquid is that the salt content is less than or equal to 1000mg/L and the COD concentration is less than or equal to 1000mg/L.
And the viscous mother liquor with precipitated crystal salt particles left after evaporation in the scraper film evaporator is conveyed to a mother liquor tank for centralized collection and then conveyed to a centrifugal separation device for solid-liquid separation treatment.
The centrifugal separation device carries out solid-liquid separation on the high-salt mother liquor in a centrifugal mode, the separated miscellaneous salt solids are directly packaged and then transported out for harmless treatment, and the separated centrifugal mother liquor is collected in a concentrated mode through a tail liquor mother liquor tank and conveyed to a tail liquor drying device.
In this embodiment, the mother liquid tank is a jacketed tank, and low-pressure saturated steam at 140-160 ℃ can be introduced into the jacket to further concentrate the viscous mother liquid, or circulating cooling water can be introduced to cool the viscous mother liquid, and when the circulating cooling water is introduced, the temperature of the upper water is controlled to be 32 ℃ and the temperature of the return water is controlled to be 42 ℃.
The centrifugal mother liquor is thoroughly dried in a tail liquor drying device, and the produced miscellaneous salt solid is packaged and then transported outside for harmless treatment. In this embodiment, the tail liquid drying device is one or a combination of multiple kinds of drum drying equipment, spray drying equipment, rake drying equipment, microwave drying equipment, and single cone drying equipment.
The vacuum device is used for pumping out non-condensable gas in the scraper film evaporator, the first condenser, the second condenser and the rectifying device, in the embodiment, the first-stage scraper film evaporator and the second-stage scraper film evaporator are communicated with a steam pipeline of the first condenser, the non-condensable gas pipeline of the first condenser is communicated with a secondary steam pipeline of the second condenser, the secondary steam pipeline of the second condenser is communicated with the rectifying tower, and the non-condensable gas pipeline of the second condenser is communicated with the vacuum device to form a non-condensable gas pipeline system.
The utility model provides a miscellaneous salt mother liquor mummification processing system has solved the mummification problem that the water treatment "zero release" technology evaporation crystallization device produced miscellaneous salt mother liquor, does not receive miscellaneous salt mother liquor water volume size, COD component difficult volatile whether, contain the condition restriction such as salt content height, and the range of application is wide; no chemical agent is added during operation, the mass and heat transfer efficiency is high, the operation cost is low, the equipment investment is small, and the device can stably operate for a long time.
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 the same; 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 in its corresponding aspects.
Claims (9)
1. A miscellaneous salt mother liquor drying treatment system is characterized by comprising a film evaporator, a separation device, a first condenser, a second condenser, a rectification device, a vacuum device and a tail liquor drying device;
the thin film evaporator is used for processing the miscellaneous salt mother liquor and converting the miscellaneous salt mother liquor into steam and viscous mother liquor in an evaporation mode, the first condenser is used for condensing the steam generated by the thin film evaporator into condensate water and conveying the condensate water into a rectifying tower of the rectifying device, the rectifying tower is used for rectifying the condensate water to generate steam containing organic matters and tower bottoms, the second condenser is used for condensing the steam containing the organic matters generated by rectifying the rectifying tower into organic solution, and the organic solution is refluxed to the rectifying tower to be rectified again and/or discharged and collected;
the separation device is used for carrying out solid-liquid separation on the viscous mother liquor generated by the thin film evaporator to obtain mixed salt solid and centrifugal mother liquor;
the tail liquid drying device is used for drying the centrifugal mother liquid generated by the separation device;
the vacuum device is used for pumping out non-condensable gas in the thin film evaporator, the first condenser, the second condenser and the rectifying device.
2. The miscellaneous salt mother liquor mummification treatment system of claim 1, wherein the thin film evaporator is a wiped film evaporator.
3. The miscellaneous salt mother liquor drying treatment system of claim 2, wherein the wiped film evaporator is a two-stage wiped film evaporator.
4. The miscellaneous salt mother liquor drying treatment system of claim 2, wherein the scraper film evaporator is further provided with an external vapor-liquid separator.
5. The miscellaneous salt mother liquor mummification treatment system of claim 1, wherein the separation device is a centrifugal separation device.
6. The mixed salt mother liquor drying treatment system as claimed in claim 1, wherein the tail liquor drying device is one or more of a roller drying device, a spray drying device, a rake drying device, a microwave drying device and a single cone drying device.
7. The miscellaneous salt mother liquor drying treatment system according to claim 2, wherein a mother liquor tank is further arranged between the scraper film evaporator and the separation device.
8. The miscellaneous salt mother liquor drying treatment system of claim 7, wherein the mother liquor tank is a jacketed tank or a reaction kettle.
9. The miscellaneous salt mother liquor drying treatment system of claim 1, wherein a tail liquor mother liquor tank is further arranged between the separation device and the tail liquor drying device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223287396.1U CN218860369U (en) | 2022-12-07 | 2022-12-07 | Miscellaneous salt mother liquor mummification processing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223287396.1U CN218860369U (en) | 2022-12-07 | 2022-12-07 | Miscellaneous salt mother liquor mummification processing system |
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| CN218860369U true CN218860369U (en) | 2023-04-14 |
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| CN202223287396.1U Active CN218860369U (en) | 2022-12-07 | 2022-12-07 | Miscellaneous salt mother liquor mummification processing system |
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