CN219839512U - Wastewater desalination and resource recycling system - Google Patents
Wastewater desalination and resource recycling system Download PDFInfo
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- CN219839512U CN219839512U CN202321325856.7U CN202321325856U CN219839512U CN 219839512 U CN219839512 U CN 219839512U CN 202321325856 U CN202321325856 U CN 202321325856U CN 219839512 U CN219839512 U CN 219839512U
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- ice crystal
- salt
- outlet
- wastewater
- separation device
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- 239000002351 wastewater Substances 0.000 title claims abstract description 48
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 22
- 238000004064 recycling Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 133
- 239000013078 crystal Substances 0.000 claims abstract description 130
- 150000003839 salts Chemical class 0.000 claims abstract description 48
- 238000000926 separation method Methods 0.000 claims abstract description 46
- 238000011084 recovery Methods 0.000 claims abstract description 17
- 238000000746 purification Methods 0.000 claims abstract description 12
- 238000001704 evaporation Methods 0.000 claims abstract description 6
- 230000008020 evaporation Effects 0.000 claims abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 11
- 238000007710 freezing Methods 0.000 claims description 9
- 230000008014 freezing Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 33
- 238000001816 cooling Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000003949 liquefied natural gas Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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- Physical Water Treatments (AREA)
Abstract
The utility model relates to a wastewater desalination and resource recycling system, which comprises a raw water tank, a raw water pump, a freeze concentration generator, a refrigerating unit, an ice crystal separation device and an ice crystal purification device, wherein the freeze concentration generator is immersed in the refrigerating unit, a solution outlet of the freeze concentration generator is communicated with a solution inlet of the ice crystal separation device, an ice crystal outlet of the ice crystal separation device is communicated with an ice crystal inlet of the ice crystal purification device, a high-salt concentration solution outlet of the ice crystal separation device is communicated with a salt recovery device, and the ice crystal separation device realizes separation of ice crystals and a high-salt wastewater solution. According to the wastewater desalination and resource recycling system, the ice crystal separation device is used for separating ice crystals from the high-salt concentration solution, valuable salt in the high-salt concentration solution is recovered through evaporation, and the ice crystals separated by the ice crystal separation device are further desalted by the ice crystal purification device, so that the wastewater desalination and resource recycling system has the advantages of stable operation, high safety, long service life, small occupied area, no secondary pollution and the like.
Description
Technical Field
The utility model relates to a desalination and resource recycling system, in particular to a wastewater desalination and resource recycling system.
Background
The high-salt wastewater mainly comes from industrial production and contains a large amount of inorganic salts and volatile organic compounds; the wastewater has complex components and belongs to the class of wastewater which is difficult to treat. The traditional treatment process has the defects of high running cost, poor stability, easy corrosion of equipment and the like. Therefore, the above problems are to be solved.
Disclosure of Invention
The utility model provides a wastewater desalination and resource recycling system for overcoming the defects of the technical problems.
The utility model relates to a wastewater desalination and resource recycling system, which comprises a raw water tank, a raw water pump, a freeze concentration generator, a refrigerating unit, an ice crystal separation device and an ice crystal purification device, wherein high-salt wastewater to be treated is stored in the raw water tank, and the raw water pump is used for pumping the high-salt wastewater in the raw water tank into the freeze concentration generator; the freezing and concentrating generator is immersed in a refrigerating unit, and the refrigerating unit refrigerates the freezing and concentrating generator to enable the high-salt wastewater in the freezing and concentrating generator to form ice crystals; the method is characterized in that: the solution outlet of the freeze concentration generator is communicated with the solution inlet of the ice crystal separating device, the ice crystal outlet of the ice crystal separating device is communicated with the ice crystal inlet of the ice crystal purifying device, the high-salt concentration solution outlet of the ice crystal separating device is communicated with the salt recovery device, and the ice crystal separating device realizes the separation of the ice crystal and the high-salt wastewater solution; the solution outlet of the ice crystal purifying device is communicated with the water return port of the freeze concentration generator, the ice crystal outlet of the ice crystal purifying device is communicated with the cold energy utilization device, and the ice crystal purifying device realizes the further removal of salt contained in the ice crystal.
According to the wastewater desalination and resource recycling system, the solution inlet of the ice crystal separation device is arranged in the middle of one side surface of the ice crystal separation device, the high-salt concentration solution outlet of the ice crystal separation device is arranged at the bottom of the other side surface of the ice crystal separation device, and the ice crystal outlet of the ice crystal separation device is arranged at the top of the ice crystal separation device.
The utility model relates to a wastewater desalination and resource recycling system, wherein a salt recovery device consists of a concentrated solution storage tank and an evaporator, a liquid inlet of the concentrated solution storage tank is communicated with a high-salt concentration solution outlet of an ice crystal separation device, a liquid outlet of the concentrated solution storage tank is communicated with a liquid inlet of the evaporator, and the evaporator is used for recovering valuable salt in high-salt wastewater through evaporation.
The utility model relates to a wastewater desalination and resource recycling system, which comprises a tubular heat exchanger and a cold-using device, wherein an ice crystal outlet of an ice crystal purifying device is connected with a low-temperature medium inlet of the tubular heat exchanger through a cold supply pump, a medium outlet and an inlet of the cold-using device are respectively communicated with an inlet and an outlet of a high-temperature medium of the tubular heat exchanger, and a low-temperature medium outlet of the tubular heat exchanger discharges treated water with salt concentration meeting discharge standards.
The wastewater desalination and resource recycling system is characterized in that a low-temperature heat exchanger is arranged in a refrigerating unit, a liquid nitrogen inlet of the low-temperature heat exchanger and a nitrogen outlet of the low-temperature heat exchanger are arranged on the low-temperature heat exchanger, and a liquid medium for realizing heat exchange between the low-temperature heat exchanger and a freeze concentration generator is stored in the refrigerating unit.
The beneficial effects of the utility model are as follows: the utility model relates to a wastewater desalination and resource recycling system, which is provided with a raw water tank, a freeze concentration generator, a refrigerating unit, an ice crystal separation device, an ice crystal purification device, a salt recovery device and a cold energy utilization device, wherein a raw water pump pumps high-salt wastewater (such as salt concentration of 4.5%) in the raw water tank into the freeze concentration generator, the refrigerating unit cools the freeze concentration generator to separate ice crystals from the high-salt concentration solution, the ice crystal separation device realizes separation of the ice crystals and the high-salt concentration solution, the salt recovery device recovers valuable salt in the high-salt concentration solution through evaporation, the ice crystal purification device further removes salt from the ice crystals separated by the ice crystal separation device, so that the salt concentration (such as 0.6%) of the ice crystals after being converted into water accords with the specification, and the salt-containing solution discharged by the ice crystal purification device flows back into the freeze concentration generator for further removal; the wastewater desalination and resource recycling system has the following advantages:
(1) The utility model operates under the low temperature condition, can effectively inhibit corrosion to equipment, and reduces the maintenance cost of the equipment.
(2) The utility model uses the pipe heat exchanger to make the ice crystal act on the cold equipment in cold energy form, to realize the utilization of cold energy; and meanwhile, the salt is recovered through a salt recovery device, so that the resource utilization is realized.
(3) The utility model obtains fine ice crystals through freezing, and the purified ice crystals have high purity and good water quality.
(4) The utility model also has the advantages of stable operation, high safety, long service life, small occupied area, no secondary pollution and the like.
Drawings
FIG. 1 is a schematic diagram of a wastewater desalination and resource recycling system of the present utility model.
In the figure: 1 raw water tank, 2 raw water pump, 3 freeze concentration generator, 4 cryogenic heat exchanger liquid nitrogen inlet, 5 cryogenic heat exchanger nitrogen outlet, 6 refrigerating unit, 7 ice crystal separator, 8 concentrate storage tank, 9 evaporimeter, 10 ice crystal purifier, 11 cooling pump, 12 tubular heat exchanger, 13 with cold equipment, 14 cryogenic heat exchanger, 15 cold energy utilization device, 16 salt recovery unit.
Detailed Description
The utility model will be further described with reference to the drawings and examples.
As shown in fig. 1, a schematic diagram of a wastewater desalination and resource recycling system of the present utility model is provided, which comprises a raw water tank 1, a raw water pump 2, a freeze concentration generator 3, a refrigerating unit 6, an ice crystal separation device 7, an ice crystal purification device 10, a salt recovery device 16 and a cold energy utilization device 15, wherein the raw water tank 1 stores high-salt wastewater to be treated (for example, the salt concentration is 4.5%) and the freeze concentration generator 3 is immersed in the refrigerating unit 6, and the refrigerating unit 6 stores a liquid medium for conducting and cooling the freeze concentration generator 3. The raw water pump 2 pumps the high-salt wastewater to be treated in the raw water tank 1 into the freeze concentration generator 3, and the high-salt wastewater in the freeze concentration generator 3 is cooled and ice crystals are separated out under the refrigeration of the refrigeration unit 6.
The solution outlet of the freeze concentration generator 3 is in communication with the solution inlet of the ice crystal separation device 7 so that the high salt wastewater containing ice crystals is passed into the ice crystal separation device 7. The ice crystal outlet of the ice crystal separation device 7 communicates with the ice crystal inlet of the ice crystal cleaning device 10 to deliver the separated ice crystals to the ice crystal cleaning device 10. The outlet of the high-salt concentration solution of the ice crystal separation device is communicated with the salt recovery device 16 so as to introduce the high-salt concentration solution separated by the ice crystal into the salt recovery device 16, and the salt recovery device 16 separates out the valuable salt in the high-salt solubility solution by evaporation to realize the recovery of the valuable salt.
The illustrated ice crystal cleaning apparatus 10 achieves further removal of salt from the incoming ice crystals to reduce the salt content of the ice crystallized water so as to provide a lower salt concentration, such as a salt concentration of 0.6%, in the water discharged from the cold energy utilization device 15. The ice crystal outlet of the ice crystal purifying device 10 is communicated with the cold energy utilization device 15 through the cold supply pump 11, and the cold energy utilization device 15 realizes the utilization of ice crystal cold energy. The solution outlet of the ice crystal purifying device 10 is communicated with the water return port of the freeze concentration generator 3 so as to realize further removal of salt in the wastewater.
The ice crystal separation device 7 shown may employ a centrifugal filter device to effect separation of precipitated ice crystals from the high salt concentration wastewater. The solution inlet on the ice crystal separation device 7 is arranged at the middle position of one side surface of the ice crystal separation device, the high-salt concentration solution outlet on the ice crystal separation device 7 is arranged at the bottom of the other side surface of the ice crystal separation device, and the ice crystal outlet of the ice crystal separation device 7 is arranged at the top of the ice crystal separation device.
The illustrated ice crystal cleaning apparatus 10 may be configured to clean ice crystals by infrared microwave heating, with the ice crystals produced in fresh water having a low dielectric constant and substantially no absorption of microwave energy. However, the ice crystals precipitated in the high-salt wastewater contain brine bubbles, which have a high dielectric constant and a high absorption capacity for microwave energy. Under microwave heating, the salt water is heated rapidly, so that salt water bubbles are broken, the formation of salt water channels is accelerated, and salt water flows out through the salt water channels to realize ice crystal purification.
The illustrated salt recovery device 16 is composed of a concentrated solution storage tank 8 and an evaporator 9, wherein a liquid inlet of the concentrated solution storage tank 8 is communicated with an outlet of the high-salt concentration solution of the ice crystal separation device 7, a liquid outlet of the concentrated solution storage tank 8 is communicated with a liquid inlet of the evaporator 9, and the evaporator 9 separates out valuable salt in the wastewater by evaporating water in the high-salt concentration solution, so that the recovery of the valuable salt is realized.
The cold energy utilization device 15 is composed of a tubular heat exchanger 12 and a cold utilization device 13, wherein an ice crystal outlet of the ice crystal purification device 10 is connected with a low-temperature medium inlet of the tubular heat exchanger 12 through a cold supply pump 11, a medium outlet and an inlet of the cold utilization device 13 are respectively communicated with an inlet and an outlet of a high-temperature medium of the tubular heat exchanger 12, and a low-temperature medium outlet of the tubular heat exchanger 12 discharges treated water with salt concentration meeting the discharge standard.
The refrigerating unit 6 is provided with a low-temperature heat exchanger 14, the low-temperature heat exchanger 14 is provided with a low-temperature heat exchanger liquid nitrogen inlet 4 and a low-temperature heat exchanger nitrogen outlet 5, liquid medium stored in the refrigerating unit 6 is reduced by introducing low-temperature liquid nitrogen into the low-temperature heat exchanger 14, and the liquid medium realizes heat exchange between the low-temperature heat exchanger 14 and high-salt wastewater in the freeze concentration generator 3. In the practical application process, the liquefied natural gas is introduced into the low-temperature heat exchanger 14, and the gasification heat absorption of the liquefied natural gas is utilized to realize cooling; in laboratory, liquid nitrogen is used for cooling in order to avoid the risk of leakage of liquefied natural gas.
The working principle of the wastewater desalination and resource recycling system of the utility model is as follows:
(1) The wastewater in the raw water tank 1 is conveyed into the freezing and concentrating generator 3 through the raw water pump 2, and then is introduced into liquid nitrogen with the liquid nitrogen inlet 4 of the low-temperature heat exchanger to cool the wastewater.
(2) With the continuous cooling of the refrigerating unit 6, tiny ice crystals are continuously generated in the freeze concentration generator 3 and float up to the water surface, and are sent into the ice crystal separation device 7 along with the solution.
(3) In the above step, fine ice crystals are precipitated after the temperature of the solution is continuously lowered to the freezing point.
(4) The concentrated solution obtained by the ice crystal separation device 7 is temporarily stored by a concentrated solution storage tank 8. And finally recovering the valuable salt through an evaporator.
The ice crystal obtained by the ice crystal separating device 7 is purified in the ice crystal purifying device 10, the purified water enters the freeze concentration generator 3, and the purified ice crystal enters the tubular heat exchanger through the cooling pump for temporary heat exchange.
In the above step, as more and more ice crystals are generated in the freeze concentration generator 3, other impurities cannot enter the ice crystals due to the single rock character of the ice, thereby resulting in an increased concentration into the concentrate tank.
(5) When the volume of the waste water contained in the freeze concentration generator 3 reaches a peak value, the raw water pump 2 is turned off, and the concentrated solution passes through the evaporator 9 to recover the value salt; and (3) after ice crystals in the tubular heat exchanger are subjected to heat exchange and melted to obtain normal-temperature water, the steps are continuously circulated.
Claims (5)
1. The system comprises a raw water tank (1), a raw water pump (2), a freeze concentration generator (3), a refrigerating unit (6), an ice crystal separation device (7) and an ice crystal purification device (10), wherein high-salt wastewater to be treated is stored in the raw water tank, and the raw water pump is used for pumping the high-salt wastewater in the raw water tank into the freeze concentration generator; the freezing and concentrating generator is immersed in a refrigerating unit, and the refrigerating unit refrigerates the freezing and concentrating generator to enable the high-salt wastewater in the freezing and concentrating generator to form ice crystals; the method is characterized in that: the solution outlet of the freeze concentration generator is communicated with the solution inlet of the ice crystal separating device, the ice crystal outlet of the ice crystal separating device is communicated with the ice crystal inlet of the ice crystal purifying device, the high-salt concentration solution outlet of the ice crystal separating device is communicated with the salt recovery device (16), and the ice crystal separating device realizes the separation of the ice crystal and the high-salt wastewater solution; the solution outlet of the ice crystal purifying device is communicated with the water return port of the freeze concentration generator, the ice crystal outlet of the ice crystal purifying device is communicated with the cold energy utilization device (15), and the ice crystal purifying device realizes the further removal of salt contained in the ice crystal.
2. The wastewater desalination and resource recovery system of claim 1, wherein: the solution inlet of the ice crystal separation device (7) is arranged in the middle of one side surface of the ice crystal separation device, the high-salt concentration solution outlet of the ice crystal separation device is arranged at the bottom of the other side surface of the ice crystal separation device, and the ice crystal outlet of the ice crystal separation device is arranged at the top of the ice crystal separation device.
3. The wastewater desalination and resource recycling system according to claim 1 or 2, characterized in that: the salt recovery device (16) is composed of a concentrated solution storage tank (8) and an evaporator (9), a liquid inlet of the concentrated solution storage tank is communicated with a high-salt concentration solution outlet of the ice crystal separation device (7), a liquid outlet of the concentrated solution storage tank is communicated with a liquid inlet of the evaporator, and the evaporator is used for recovering valuable salt in high-salt wastewater through evaporation.
4. The wastewater desalination and resource recycling system according to claim 1 or 2, characterized in that: the cold energy utilization device (15) consists of a tubular heat exchanger (12) and a cold utilization device (13), wherein an ice crystal outlet of the ice crystal purification device (10) is connected with a low-temperature medium inlet of the tubular heat exchanger (12) through a cold supply pump (11), a medium outlet and an inlet of the cold utilization device are respectively communicated with a high-temperature medium inlet and a high-temperature medium outlet of the tubular heat exchanger, and a low-temperature medium outlet of the tubular heat exchanger discharges treated water with salt concentration meeting a discharge standard.
5. The wastewater desalination and resource recycling system according to claim 1 or 2, characterized in that: the refrigerating unit (6) is internally provided with a low-temperature heat exchanger (14), the low-temperature heat exchanger is provided with a low-temperature heat exchanger liquid nitrogen inlet (4) and a low-temperature heat exchanger nitrogen outlet (5), and a liquid medium for realizing heat exchange between the low-temperature heat exchanger and the freeze concentration generator (3) is stored in the refrigerating unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321325856.7U CN219839512U (en) | 2023-05-29 | 2023-05-29 | Wastewater desalination and resource recycling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321325856.7U CN219839512U (en) | 2023-05-29 | 2023-05-29 | Wastewater desalination and resource recycling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219839512U true CN219839512U (en) | 2023-10-17 |
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ID=88300296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321325856.7U Active CN219839512U (en) | 2023-05-29 | 2023-05-29 | Wastewater desalination and resource recycling system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219839512U (en) |
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2023
- 2023-05-29 CN CN202321325856.7U patent/CN219839512U/en active Active
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