CN217202398U - MSR-NF divides salt crystal system - Google Patents
MSR-NF divides salt crystal system Download PDFInfo
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- CN217202398U CN217202398U CN202220205223.1U CN202220205223U CN217202398U CN 217202398 U CN217202398 U CN 217202398U CN 202220205223 U CN202220205223 U CN 202220205223U CN 217202398 U CN217202398 U CN 217202398U
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Abstract
The utility model discloses a MSR-NF divides salt crystal system, include: the evaporation crystallization module, the solid-liquid separation module, dissolve module and nanofiltration module, the import and the mother liquor source of evaporation crystallization module are connected, the magma export of evaporation crystallization module and the access connection of solid-liquid separation module, the solid export of solid-liquid separation module and the solid access connection of dissolving the module, it is used for dissolving the wet salt that solid-liquid separation module carried to dissolve the module, dissolve the solid export of module and the access connection of nanofiltration module, the monovalent salt export of nanofiltration module is used for evaporating crystallization system with monovalent salt and is connected, the divalent salt export of nanofiltration module is used for evaporating crystallization system with divalent salt and is connected; the utility model discloses a MSR-NF divides salt crystal system to a great extent has reduced the final abandonment miscellaneous salt volume of whole minute salt equipment, solves the problem that miscellaneous salt treatment cost is high, has also improved resource utilization simultaneously, reduces the human resource input cost, has reduced the running cost.
Description
Technical Field
The utility model relates to a sewage treatment technical field, in particular to MSR-NF (Mixed Salt Return back Solution-Nanofiltration Mixed Salt back dissolving-Nanofiltration) divides Salt crystal system.
Background
The zero discharge technology is characterized in that after industrial water is reused, part of salt content and pollutants are highly concentrated into wastewater, and the wastewater is completely (more than 99%) recycled, and the salt and the pollutants in the water are concentrated, crystallized or filter-pressed, and waste residues are discharged in a solid form and sent to a garbage treatment plant for landfill or recovered as useful chemical raw materials. With the requirement of zero emission technology in the fields of power plants, chemical industry and coal chemical industry, the emission of energy resources which must be generated in production needs to be controlled.
In a wastewater treatment process containing high-concentration monovalent salt and divalent salt, wastewater subjected to hard removal and impurity removal in a pretreatment process is usually introduced into an evaporative crystallization system, the system firstly passes through a MVR (mechanical vapor recompression) sodium chloride crystallization unit, wherein sodium chloride crystalline salt is produced through the processes of sodium chloride evaporative crystallization, solid-liquid separation, drying, packaging and the like, mother liquor is discharged and enters a freezing crystallization unit to obtain mirabilite and frozen mother liquor, the mirabilite is subjected to hot-melt recrystallization to obtain sodium sulfate crystalline salt, the frozen mother liquor passes through a mixed salt crystallization unit and is subjected to evaporative crystallization again, impurity salt is filtered, the mother liquor is subjected to drying treatment, and the obtained impurity salt is subjected to solid waste treatment.
However, the main challenges faced by conventional techniques are: the method does not directly produce high-value products, so that the method is more sensitive to energy consumption and cost, the mainstream evaporation salt separation process is generally divided into hot method crystallization and cold method crystallization, mixed salt is generally produced in operation, the mixed salt is classified into solid waste, and the resource utilization of the mixed salt is extremely low, so that the treatment cost is very high, the operation cost is invisibly increased, and the reduction treatment of the mixed salt is carried out to reduce the operation cost, so that the technical difficulty is at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome foretell not enough, it is big to miscellaneous salt content among the evaporation crystallization technology implementation process, handles the problem that solid useless is with high costs, the utility model provides a high efficiency, it is energy-conserving, have the miscellaneous salt decrement technology of good feature of environmental protection and economic nature, a MSR-NF divides salt crystal system promptly.
The utility model provides a pair of salt crystal system is divided to MSR-NF, including the evaporation crystallization module, the solid-liquid separation module, dissolve the module and receive the filter module, the import and the mother liquor source of evaporation crystallization module are connected, the magma export of evaporation crystallization module and the access connection of solid-liquid separation module, the solid export of solid-liquid separation module and the solid access connection who dissolves the module, it is used for dissolving the wet salt that solid-liquid separation module carried and forms solution to dissolve the module, the solution export that dissolves the module and the access connection who receives the filter module, the monovalent salt export that receives the filter module is used for evaporating the crystal system with monovalent salt and is connected, receive the divalent salt export of filter module and be used for evaporating crystal system with divalent salt and be connected, thereby form monovalent salt and the circulation system that divalent salt evaporated the crystallization.
Furthermore, the solid-liquid separation module comprises a thickener and a salt mixing centrifuge, an inlet of the thickener is connected with a crystal slurry outlet of the evaporation crystallization module, a crystal slurry outlet of the thickener is connected with an inlet of the salt mixing centrifuge, and a solid outlet of the salt mixing centrifuge is connected with a solid inlet of the dissolution module.
Furthermore, the evaporative crystallization module comprises a circulating power source, a mixed salt heater and a mixed salt crystallizer which are sequentially connected, wherein an inlet of the circulating power source is connected with the mother liquor source, a material circulating outlet of the mixed salt crystallizer is connected with an inlet of the circulating power source, and a crystal slurry outlet of the mixed salt crystallizer is connected with an inlet of the solid-liquid separation module.
Furthermore, the MSR-NF crystallization system also comprises a mother liquor storage module and a mother liquor drying module, wherein a liquid outlet of the solid-liquid separation module is connected with an inlet of the mother liquor storage module, and a liquid outlet of the mother liquor storage module is connected with the mother liquor drying module.
Furthermore, a liquid outlet of the mother liquor storage module is also connected with an inlet of the evaporation crystallization module, the evaporation crystallization module comprises a circulating power source, a mixed salt heater and a mixed salt crystallizer which are sequentially connected, an inlet of the circulating power source is connected with the mother liquor source, a material circulating outlet of the mixed salt crystallizer is connected with the inlet of the circulating power source, a crystal slurry outlet of the mixed salt crystallizer is connected with an inlet of the solid-liquid separation module, the mother liquor storage module is communicated with the mother liquor drying module when the temperature of a feed liquid outlet of the mixed salt heater reaches a preset temperature value, and is communicated with the inlet of the evaporation crystallization module when the temperature of the feed liquid outlet of the mixed salt heater is lower than the preset temperature value.
Further, the evaporation crystallization module is provided with a steam outlet, the MSR-NF salt separation crystallization system further comprises a condensation module, the condensation module comprises a mixed salt condenser, a secondary condensation water tank and a negative pressure unit connected with the mixed salt condenser and used for providing negative pressure for the mixed salt condenser, an inlet of the mixed salt condenser is connected with the steam outlet of the evaporation crystallization module, and a liquid outlet of the mixed salt condenser is connected with the secondary condensation water tank.
Further, the negative pressure unit comprises a negative pressure source, a vacuum gas-liquid separation tank and a working liquid cooler which are sequentially connected, and an inlet of the negative pressure source is connected with a non-condensing outlet of the mixed salt condenser.
Further, the dissolving module is also provided with a high-temperature liquid inlet connected with a high-temperature liquid source.
Further, the mother liquor in the mother liquor source comprises a monovalent salt evaporative crystallization system mother liquor and/or a divalent salt evaporative crystallization system mother liquor.
Further, the mixed salt heater is a double-tube pass horizontal heat exchanger.
Further, the outlet of the working fluid cooler is connected to a negative pressure source for providing cooling fluid to the negative pressure source.
The utility model has the advantages that: the utility model provides a pair of MSR-NF divides salt crystal system can carry out further processing to the mother liquor that produces in the waste water treatment process of monovalent salt and divalent salt, can reduce miscellaneous salt load by very big degree, and the mother liquor that produces in monovalent salt and the divalent salt waste water treatment process mixes and gets into the utility model discloses an after MSR-NF divides the salt system, by the nanofiltration system separation after evaporation concentration crystallization, solid-liquid separation, get into monovalent salt and divalent salt evaporation crystal system once more, increase resource utilization; meanwhile, the heater in the concentration module adopts a double-tube pass horizontal heater, so that the arrangement height of the whole system is reduced, the tube pass flow rate of a heat exchanger is improved, the flow rate of the system is controlled, the scaling risk is reduced, and the operation efficiency of the system is increased; the utility model discloses a MSR-NF divides salt crystal system to a great extent has reduced the final abandonment miscellaneous salt volume of whole minute salt equipment, solves the problem that miscellaneous salt treatment cost is high, has also improved resource utilization simultaneously, reduces the human resource input cost, has reduced the running cost.
Drawings
Fig. 1 is a schematic structural diagram of an MSR-NF fractional salt crystallization system in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of an MSR-NF fractional salt crystallization system in an embodiment of the present invention.
As shown in fig. 1, the MSR-NF fractional salt crystallization system in this embodiment includes an evaporation crystallization module, a solid-liquid separation module, a dissolution module, a nanofiltration module 14, a mother liquor storage module, a mother liquor drying module 15, and a condensation module.
The evaporative crystallization module is used for concentrating mother liquor, wherein the mother liquor comprises monovalent salt evaporative crystallization system mother liquor and/or divalent salt evaporative crystallization system mother liquor mixed liquor. In this example, the mother liquor is mixed by the monovalent salt evaporative crystallization system mother liquor and/or the divalent salt evaporative crystallization system mother liquor. Mother liquor in the mother liquor source enters an inlet of the evaporative crystallization module through a feed pump. The evaporative crystallization module comprises a circulating power source, a mixed salt heater 2, a mixed salt crystallizer 1 and a mixed salt condensate water tank 13 which are connected in sequence.
The inlet of the circulating power source is connected with the mother liquor source through a pipeline. In the present embodiment, the circulating power source is a mixed salt circulating pump 5.
The mixed salt heater is a double-tube-pass horizontal heat exchanger, an air inlet of the double-tube-pass horizontal heat exchanger is communicated with a pressure reduction steam header pipe in the system, a steam heat source is conveyed into the double-tube-pass horizontal heat exchanger through the pressure reduction steam header pipe, a condensate water outlet of the double-tube-pass horizontal heat exchanger is connected with a mixed salt condensate water tank 13, and steam condensate generated by the steam heat source in the double-tube-pass horizontal heat exchanger is discharged into the mixed salt condensate water tank 13 through the condensate water outlet. The feed liquid inlet of the double-tube-pass horizontal heat exchanger is connected with the feed liquid outlet of the mixed salt circulating pump 5, and the feed liquid outlet of the double-tube-pass horizontal heat exchanger is connected with the inlet of the mixed salt crystallizer 1.
The material circulation outlet of the mixed salt crystallizer 1 is connected with the inlet of a circulation power source through a pipeline, and the crystal slurry outlet of the mixed salt crystallizer 1 is connected with the inlet of the solid-liquid separation module through a pipeline. When the mixed feed pump conveys mother liquor to the evaporative crystallization module, a material circulation outlet of the mixed salt crystallizer 1 is communicated with an inlet of a circulation power source, the mother liquor is circularly concentrated in the evaporative crystallization module, and when the discharge concentration is reached, crystal slurry of the mixed salt crystallizer 1 enters a solid-liquid separation device from a crystal slurry outlet through a discharge pump; and when the mixed feeding pump stops conveying the mother liquor to the evaporative crystallization module, the crystal slurry outlet of the mixed salt crystallizer 1 is not communicated with the solid-liquid separation module any more. And a steam outlet of the mixed salt crystallizer 1 is connected with the condensation module, and secondary steam generated by the mixed salt crystallizer 1 enters the condensation module.
The solid-liquid separation module comprises a thickener 4 and a salt mixing centrifuge 5, and an inlet of the thickener 4 is connected with a crystal slurry outlet of the evaporation crystallization module. The upper part of the thickener 4 is also provided with an overflow port, and clear liquid in the thickener 4 enters the mother liquid storage module through the overflow port. The lower part of the thickener 4 is conical and is provided with a crystal slurry outlet, and the crystal slurry outlet of the thickener 4 is connected with an inlet of the mixed salt centrifuge 5. The crystal slurry liquid enters a salt mixing centrifuge 5 from a crystal slurry outlet of the thickener 4 for solid-liquid separation.
The mixed salt centrifuge 5 has a solids outlet and a liquid outlet. And a solid outlet of the mixed salt centrifuge 5 is connected with a solid inlet of the dissolving module, and a liquid outlet of the mixed salt centrifuge 5 is connected with an inlet of the mother liquor storage module. The liquid separated by the salt mixing centrifuge 5 enters a mother liquid storage module, and wet salt enters a dissolving module.
The dissolving module is used for dissolving the wet salt conveyed by the solid-liquid separation module, and an outlet of the dissolving module is connected with an inlet of the nanofiltration module 14. In this embodiment, the high-temperature liquid inlet of the dissolution module is connected to the high-temperature crystallized condensed water or the high-temperature mother liquid in the system. The dissolving module is a mixed salt dissolving tank 7.
Wet salt enters the dissolving module, is mixed with high-temperature liquid accessed into the dissolving module, is fully dissolved, enters the nanofiltration module 14 through a salt mixing dissolving pump, and respectively circularly enters a monovalent salt evaporation crystallization system and a divalent salt evaporation crystallization system after being separated by a nanofiltration membrane in the nanofiltration module 14.
The liquid outlet of the mother liquid storage module is respectively connected with the inlet of the mother liquid drying module 15 and the inlet of the circulating power source through pipelines. The mother liquor storage module is a mixed salt mother liquor tank 6.
The liquid outlet of the mother liquid storage module is communicated with the mother liquid drying module 15 when the temperature of the feed liquid outlet of the mixed salt heater 2 reaches a preset temperature value, so that the mother liquid conveyed by the mother liquid storage module is dried to obtain mixed salt waste, and is communicated with the evaporative crystallization module when the temperature of the feed liquid outlet of the mixed salt heater 2 does not reach the preset temperature value. The preset temperature value is the sum of the evaporation temperature and the boiling point rise of the mixed salt solution.
The condensation module comprises a mixed salt condenser 8, a secondary condensed water tank 12 and a negative pressure unit connected with the mixed salt condenser 8. An inlet of the mixed salt condenser 8 is connected with a steam outlet of the mixed salt crystallizer 1, and a liquid outlet of the mixed salt condenser 8 is connected with a secondary condensed water tank 12. The negative pressure unit is used for maintaining the vacuum degree of the system and separating liquid drops brought out by non-condensable gas in the mixed salt condenser 8 so as to avoid the liquid drops from damaging system equipment. The negative pressure unit comprises a negative pressure source, a vacuum gas-liquid separation tank 10 and a working liquid cooler 11 which are connected in sequence. The inlet of the negative pressure source is connected with the non-condensed steam outlet of the mixed salt condenser 8. The vacuum gas-liquid separation tank 10 is provided with a gas outlet and a liquid outlet, when the non-condensable gas with liquid droplets enters the vacuum gas-liquid separation tank 10, the gas is directly discharged from the gas outlet of the vacuum gas-liquid separation tank 10, and the liquid is introduced into the working liquid cooler 11 from the liquid outlet of the vacuum gas-liquid separation tank 10. Part of the coolant in the working fluid cooler 11 is connected to a negative pressure source for cooling the negative pressure source. In this embodiment, the source of negative pressure is a vacuum pump set 9.
The working principle of the MSR-NF salt separation crystallization system in the example is as follows:
in the embodiment, the evaporation crystallization module is a single-effect evaporation system, monovalent salt and divalent salt evaporation crystallization system mother liquor are mixed for feeding, and the evaporation crystallization module is fed intermittently; the evaporation crystallization module is provided with a steam heating heat source by a temperature-reducing steam main pipe; the mixed mother liquor containing high sodium chloride, sodium sulfate, sodium nitrate salt passes through the charge pump and lets in the evaporative crystallization module, get into mixed salt heater 2 by mixed salt circulating pump 5, form the circulation of mixed salt evaporative crystallization, it is different according to the boiling point rise of salt solution, wherein the boiling point of nitrate solution risees in other salt solutions, therefore the ejection of compact temperature of control system heater, reach boiling point temperature with sodium sulfate solution in order to satisfy saturated sodium chloride, the feed liquid after the intensification gets into mixed salt crystallizer 1, after carrying out gas-liquid separation in the evaporating chamber of mixed salt crystallizer 1, the steam of secondary at crystallizer top gets into final effect condensation module after the defogging of defroster. The mixed salt condenser 8 is connected with a vacuum pump set 9 to form a negative pressure system, secondary steam is condensed and collected to a secondary condensed water tank 12 through a condensed water pipeline.
The crystal slurry of the mixed salt crystallizer 1 enters a solid-liquid separation module by a discharge pump for solid-liquid separation, the separated wet salt mainly comprises sodium chloride and sodium sulfate mixed salt crystals, the wet salt enters a mixed salt dissolving tank 7, the mixed salt dissolving tank 7 dissolves the wet salt, then the wet salt is separated by a nanofiltration module 14 and enters a monovalent salt and divalent salt evaporation crystallization system, and a centrifuge liquid phase outlet discharges concentrated feed liquid with high nitrate content into a mixed salt mother liquor tank 6. Concentrated feed liquid in the mixed salt mother liquor tank 6 and mother liquor enter the concentration module together to be evaporated, crystallized and circulated again, when the temperature of the feed liquid outlet of the mixed salt heater 2 reaches a preset temperature value, the liquid in the mixed salt mother liquor tank 6 can be judged to be the concentrated feed liquid with high nitrate and high boiling organic matter content, the mixed salt mother liquor tank 6 is connected into the mother liquor drying module 15, and the mother liquor drying module 15 is used for drying the concentrated feed liquid to obtain the miscellaneous salt waste.
The utility model aims to provide a set of complete MSR-NF salt separating system; the system can further treat freezing mother liquor generated in the wastewater treatment process of monovalent salt and divalent salt to obtain monovalent salt and divalent salt, can greatly reduce the discharge amount of miscellaneous salt, and mother liquor generated in the wastewater treatment process of monovalent salt and divalent salt is mixed to enter the MSR-NF salt separation system, is separated by a nanofiltration system after evaporation concentration crystallization and solid-liquid separation, enters the monovalent salt and divalent salt evaporation crystallization system again, and increases the resource utilization rate; meanwhile, the heater in the concentration module adopts a double-tube-pass horizontal heater, so that the arrangement height of the whole system is reduced, the tube pass flow rate of the heat exchanger is improved, the flow rate of the system is controlled, the scaling risk is reduced, and the operation efficiency of the system is increased.
To sum up, be the utility model discloses a concrete application example, it is right the utility model discloses the protection scope does not constitute the restriction, adopts the technical scheme of equivalent replacement all to fall within the utility model discloses within the protection scope.
Claims (10)
1. An MSR-NF salt separation crystallization system, which is characterized by comprising: evaporation crystallization module, solid-liquid separation module, dissolve the module and receive the filter module, the import and the mother liquor source of evaporation crystallization module are connected, the magma export of evaporation crystallization module with the access connection of solid-liquid separation module, the solid outlet of solid-liquid separation module with dissolve the solid access connection of module, it is right to dissolve the module be used for wet salt that solid-liquid separation module carried dissolves, the solution export of dissolving the module with receive the access connection of filter module, receive the monovalent salt export of filter module and be used for evaporating crystallization system with monovalent salt and be connected, receive the divalent salt export of filter module and be used for evaporating crystallization system with divalent salt and be connected.
2. The MSR-NF salt-separation crystallization system according to claim 1, wherein the solid-liquid separation module comprises a thickener and a salt-mixing centrifuge, an inlet of the thickener is connected with a crystal slurry outlet of the evaporation crystallization module, a crystal slurry outlet of the thickener is connected with an inlet of the salt-mixing centrifuge, and a solid outlet of the salt-mixing centrifuge is connected with a solid inlet of the dissolution module.
3. The MSR-NF salt separation crystallization system according to claim 1, wherein the evaporation crystallization module comprises a circulating power source, a mixed salt heater and a mixed salt crystallizer which are connected in sequence, an inlet of the circulating power source is connected with the mother liquid source, a material circulating outlet of the mixed salt crystallizer is connected with an inlet of the circulating power source, and a magma outlet of the mixed salt crystallizer is connected with an inlet of the solid-liquid separation module.
4. The MSR-NF salt-separating crystallization system according to claim 1, further comprising a mother liquor storage module and a mother liquor drying module, wherein the liquid outlet of the solid-liquid separation module is connected with the inlet of the mother liquor storage module, and the liquid outlet of the mother liquor storage module is connected with the mother liquor drying module.
5. The MSR-NF divides salt crystal system of claim 4, characterized in that, the liquid outlet of mother liquor storage module still with the access connection of evaporation crystal module, evaporation crystal module is including the circulation power supply, mixed salt heater and the mixed salt crystallizer that connect gradually, the import of circulation power supply with the mother liquor source is connected, the material circulation export of mixed salt crystallizer with the access connection of circulation power supply, the magma export of mixed salt crystallizer with the access connection of solid-liquid separation module, mother liquor storage module be used for when the feed liquid outlet temperature of mixed salt heater reaches preset temperature value with mother liquor mummification module intercommunication when the feed liquid outlet temperature of mixed salt heater is less than preset temperature value with the import intercommunication of evaporation crystal module.
6. The MSR-NF divides salt crystal system of claim 1 or 3, characterized in that, the evaporation crystal module still has steam outlet, the MSR-NF divides salt crystal system still includes the condensation module, the condensation module includes mixed salt condenser, secondary condensate water jar and with the mixed salt condenser is connected and is used for providing the negative pressure unit of negative pressure to the mixed salt condenser, the import of mixed salt condenser with the steam outlet of evaporation crystal module is connected, the liquid outlet of mixed salt condenser with the secondary condensate water jar is connected.
7. The MSR-NF salt separation and crystallization system according to claim 6, wherein the negative pressure unit comprises a negative pressure source, a vacuum gas-liquid separation tank and a working liquid cooler which are connected in sequence, and an inlet of the negative pressure source is connected with an incondensable steam outlet of the mixed salt condenser.
8. The MSR-NF fractional salt crystallization system of claim 1, wherein the dissolving module further has a high temperature liquid inlet connected to a high temperature liquid source.
9. The MSR-NF fractional salt crystallization system of claim 1, wherein the mother liquor in the mother liquor source comprises a monovalent salt evaporative crystallization system mother liquor and/or a divalent salt evaporative crystallization system mother liquor.
10. The MSR-NF salt separation crystallization system of claim 5, wherein the mixed salt heater is a double-tube pass horizontal heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220205223.1U CN217202398U (en) | 2022-01-26 | 2022-01-26 | MSR-NF divides salt crystal system |
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| CN202220205223.1U CN217202398U (en) | 2022-01-26 | 2022-01-26 | MSR-NF divides salt crystal system |
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