CN216092310U - Freezing crystallization system - Google Patents
Freezing crystallization system Download PDFInfo
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- CN216092310U CN216092310U CN202122054274.7U CN202122054274U CN216092310U CN 216092310 U CN216092310 U CN 216092310U CN 202122054274 U CN202122054274 U CN 202122054274U CN 216092310 U CN216092310 U CN 216092310U
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Abstract
The utility model discloses a freezing crystallization system which comprises a freezing crystallization tank, a separation device, a mother liquor tank, a freezing heat exchanger and a freezing crystallizer. The advantages are that: 1. the waste water passes through the freezing crystallization tank and the freezing crystallizer to realize twice freezing crystallization, the temperature of the twice freezing crystallization is different, the amount of precipitated crystals is also different, the temperature of the waste water entering the freezing crystallizer is reduced, namely, the temperature difference of the inlet and the outlet of the freezing heat exchanger is reduced, and the problem of precipitation and blockage of a large amount of crystals in the heat exchanger is solved. 2. The mixing of the feed liquid with different concentrations and different temperatures is realized, so that the whole concentration of the feed liquid in the mother liquid tank is reduced, the temperature is increased, and the problem of pipeline blockage caused by excessive fine crystal grains is avoided. 3. Through the heat exchange of the freezing discharge clear liquid and the freezing liquid with the wastewater in the jacket, the primary freezing crystallization of the sodium sulfate freezing wastewater is realized while the system energy consumption is fully utilized.
Description
The technical field is as follows:
the utility model relates to the technical field of wastewater treatment, in particular to a freezing and crystallizing system.
Background art:
at present, the main treatment process flow of the wastewater is basically fixed, and the wastewater realizes zero discharge mainly through combined processes of pretreatment, membrane concentration, nanofiltration salt separation, cold-hot crystallization and the like. The freezing crystallization method comprises the steps of feeding waste water into a freezing crystallizer, feeding feed liquid into a freezing heat exchanger through a freezing circulating pump at the bottom of the crystallizer to exchange heat with freezing liquid from a freezing unit, and cooling the feed liquid to separate out crystals; however, as the temperature of the waste water is high, the temperature of the freezing crystallization is low, the temperature difference between the inlet and the outlet of the heat exchanger is large, and a large amount of crystals are separated out from the heat exchanger, so that the freezing heat exchanger is easy to block; in addition, fine grains still exist in the mother liquor after the freezing feed liquid discharged from the freezing crystallizer is separated, and the problem of pipeline blockage caused by too many fine grains is also solved. The problems seriously affect the running time and the effect of the freezing and crystallizing system, further cause the problems that the whole wastewater treatment system cannot run continuously, a large amount of wastewater is cached, the production pressure is increased and the like, and therefore, a freezing and crystallizing system which can run continuously and stably for a long time is urgently needed to be found.
The utility model has the following contents:
the utility model aims to provide a freezing and crystallizing system for solving the problem of blockage.
The utility model is implemented by the following technical scheme: the freezing crystallization system comprises a freezing crystallization tank, a separation device, a mother liquor tank, a freezing heat exchanger and a freezing crystallizer, wherein the outlet of a water inlet pipe is communicated with a liquid inlet pipeline at the top of the freezing crystallization tank, the bottom slurry outlet of the freezing crystallization tank is communicated with an inlet pipeline of a first slurry pump, the outlet of the first slurry pump is communicated with an inlet pipeline of a first cyclone separator, the discharge port of the first cyclone separator is communicated with the inlet pipeline of the separation device, and the overflow port of the separation device is communicated with the inlet pipeline of the mother liquor tank; an outlet of the mother liquor tank is communicated with an inlet pipeline of a mother liquor pump, an outlet of the mother liquor pump is communicated with an inlet pipeline of the freezing heat exchanger, and an outlet of the freezing heat exchanger is communicated with an inlet pipeline of the freezing crystallizer; the outlet of the freezing crystallizer is communicated with the inlet of a freezing circulating pump, the outlet of the freezing circulating pump is divided into two paths, one path is communicated with the inlet of the freezing heat exchanger through a pipeline, and the other path is communicated with the inlet of a freezing discharging pump through a pipeline; the outlet of the freezing discharge pump is communicated with an inlet pipeline of a second cyclone separator, the discharge port of the second cyclone separator is communicated with the inlet of the separation device, and the discharge port of the separation device is communicated with the inlet of the centrifugal machine.
Furthermore, the freezing and crystallizing tank comprises a tank body and a cooling jacket arranged outside the tank body, and a cooling liquid inlet and a cooling liquid outlet are communicated on the cooling jacket.
Furthermore, the freezing crystallization tank comprises a tank body, a freezing jacket and a cooling jacket are arranged outside the tank body, the freezing jacket is communicated with a refrigerating fluid inlet and a refrigerating fluid outlet, and the cooling jacket is communicated with a cooling fluid inlet and a cooling fluid outlet.
Further, a liquid outlet of the freezing crystallizer is communicated with an inlet pipeline of a clear liquid tank, an outlet of the clear liquid tank is communicated with an inlet pipeline of a clear liquid pump, and an outlet of the clear liquid pump is communicated with the cooling liquid inlet pipeline.
Furthermore, the cooling liquid outlet is divided into two paths, one path is communicated with an external discharge pipe, and the other path is communicated with the interior of the freezing crystallization tank through a return pipe; an outer discharge control valve is arranged on the outer discharge pipe, and a backflow control valve is arranged on the backflow pipe.
Furthermore, an outlet of the mother liquid pump is communicated with an inlet of the freezing discharge pump through a bypass pipe, and a bypass control valve is installed on the bypass pipe.
Further, the liquid outlet of the first cyclone separator, the liquid outlet of the second cyclone separator and the liquid outlet of the centrifugal machine are communicated with an inlet pipeline of the mother liquid tank.
The utility model has the advantages that: 1. the waste water passes through the freezing crystallization tank and the freezing crystallizer to realize twice freezing crystallization, the temperature of the twice freezing crystallization is different, the amount of precipitated crystals is also different, the temperature of the waste water entering the freezing crystallizer is reduced, namely, the temperature difference of the inlet and the outlet of the freezing heat exchanger is reduced, and the problem of precipitation and blockage of a large amount of crystals in the heat exchanger is solved. 2. The dehydrated mother liquor discharged by the centrifuge, the overflow clear liquid of the separation device, the clear liquid discharged by the first cyclone separator and the clear liquid discharged by the second cyclone separator are fully mixed in the mother liquor tank, so that the mixing of feed liquids with different concentrations and different temperatures is realized, the integral concentration of the feed liquid in the mother liquor tank is reduced, the temperature is increased, a large amount of fine crystal grains existing in the mother liquor tank are diluted and dissolved, and the problem of pipeline blockage caused by excessive fine crystal grains is avoided; meanwhile, the fine crystal grains are dissolved and then returned to the system for circulating freezing crystallization, so that the precipitation amount of the crystal salt can be increased. 3. The refrigerating fluid and the clear liquid discharged by the freezing crystallizer exchange heat with the wastewater in the jacket, so that the primary freezing crystallization of the sodium sulfate freezing wastewater is realized while the energy consumption of the system is fully utilized.
Description of the drawings:
fig. 1 is a schematic view of the entire structure of embodiment 1.
Fig. 2 is a schematic view of the entire structure of embodiment 2.
FIG. 3 is a schematic view showing the structure of a freezing and crystallizing tank in example 2.
The system comprises a freezing crystallization tank 1, a tank body 101, a cooling jacket 102, a cooling liquid inlet 103, a cooling liquid outlet 104, a freezing jacket 105, a freezing liquid inlet 106, a freezing liquid outlet 107, a separation device 2, a mother liquid tank 3, a freezing heat exchanger 4, a freezing crystallizer 5, a water inlet pipe 6, a first slurry pump 7, a first cyclone separator 8, a mother liquid pump 9, a freezing discharge pump 10, a second cyclone separator 11, a centrifuge 12, a clear liquid tank 13, a clear liquid pump 14, an outer discharge pipe 15, a return pipe 16, an outer discharge control valve 17, a reflux control valve 18, a bypass pipe 19, a bypass control valve 20 and a freezing circulation pump 21.
The specific implementation mode is as follows:
in the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1: as shown in fig. 1, the freezing and crystallizing system comprises a freezing and crystallizing tank 1, a separating device 2, a mother liquor tank 3, a freezing heat exchanger 4 and a freezing and crystallizing device 5, wherein an outlet of a water inlet pipe 6 is communicated with a liquid inlet pipeline at the top of the freezing and crystallizing tank 1, a slurry outlet at the bottom of the freezing and crystallizing tank 1 is communicated with an inlet pipeline of a first slurry pump 7, an outlet of the first slurry pump 7 is communicated with an inlet pipeline of a first cyclone separator 8, a discharge port of the first cyclone separator 8 is communicated with the inlet pipeline of the separating device 2, and an overflow port of the separating device 2 is communicated with an inlet pipeline of the mother liquor tank 3; an outlet of the mother liquor tank 3 is communicated with an inlet pipeline of a mother liquor pump 9, an outlet of the mother liquor pump 9 is communicated with an inlet pipeline of a freezing heat exchanger 4, and an outlet of the freezing heat exchanger 4 is communicated with an inlet pipeline of a freezing crystallizer 5; the outlet of the freezing crystallizer 5 is communicated with the inlet of a freezing circulating pump 21, the outlet of the freezing circulating pump 21 is divided into two paths, one path is communicated with the inlet of the freezing heat exchanger 4 through a pipeline, and the other path is communicated with the inlet of a freezing discharge pump 10 through a pipeline; the outlet of the freezing discharge pump 10 is communicated with the inlet pipeline of the second cyclone separator 11, the discharge port of the second cyclone separator 11 is communicated with the inlet of the separation device 2, and the discharge port of the separation device 2 is communicated with the inlet of the centrifuge 12. The liquid outlet of the first cyclone separator 8, the liquid outlet of the second cyclone separator 11 and the liquid outlet of the centrifuge 12 are all communicated with the inlet pipeline of the mother liquor tank 3.
The waste water enters a freezing crystallization tank 1 through a water inlet pipe 6, and the freezing temperature of the freezing crystallization tank 1 is 5-30 ℃. When the temperature of the sodium sulfate freezing wastewater is 35-95 ℃, the freezing temperature of the freezing crystallization tank 1 is 15-30 ℃; when the temperature of the sodium sulfate freezing wastewater is 20-35 ℃, the freezing temperature of the freezing crystallization tank 1 is 5-15 ℃; under the condition that the wastewater is frozen and cooled in the freezing and crystallizing tank 1, partial crystal salt is separated out to form crystal slurry; the magma in the freezing and crystallizing tank 1 is sent to a first cyclone separator 8 by a first slurry pump 7, and the separated magma enters a separating device 2.
In the system, the dehydrated mother liquor discharged by the centrifuge 12, the overflow clear liquid of the separation device 2, the clear liquid discharged by the first cyclone separator 8 and the clear liquid discharged by the second cyclone separator 11 are all sent into the mother liquor tank 3 and are fully mixed under the stirring action. Because the freezing temperature and the solid content in the freezing crystallization tank 1 and the freezing crystallizer 5 are different, after the clear liquid with high temperature generated by the first cyclone separator 8 is mixed with the centrifugally dewatered mother liquid and the overflow clear liquid of the separation device 2, the integral concentration in the mother liquid tank 3 can be reduced and the temperature can be increased, and fine crystal grains in the mother liquid tank 3 can be diluted and dissolved, thereby avoiding the problem that the pipeline is easy to block because the centrifugal mother liquid contains too many fine crystal grains in the conventional freezing crystallization process. Meanwhile, the fine crystal grains are dissolved and then returned to the system for circulating freezing crystallization, so that the precipitation amount of the crystal salt can be increased.
Then the mother liquor is pumped to the freezing heat exchanger 4 by the mother liquor pump 9 to be cooled and then enters the freezing crystallizer 5, continuously flows through the freezing heat exchanger 4 under the action of the freezing circulating pump 21, circularly exchanges heat with the freezing liquor generated by the freezing unit in the heat exchanger, reduces the temperature again, and simultaneously precipitates a large amount of crystals again. The crystals in the freezing crystallizer 5 are settled at the bottom, when the crystals at the bottom of the freezing crystallizer 5 circulate along with the freezing circulating pump 21, part of the crystals are pumped to the second cyclone separator 11 by the freezing discharge pump 10 for solid-liquid separation and then enter the separation device 2 for separation, and the separated crystal mush enters the centrifuge 12 for centrifugal separation to obtain crystal salt.
Clear liquid is arranged at the top of the freezing crystallizer 5, and the clear liquid is discharged into a clear liquid tank 13 through a clear liquid discharge port at the top of the freezing crystallizer 5. Specifically, the freezing and crystallizing tank 1 comprises a tank body 101 and a cooling jacket 102 arranged outside the tank body 101, wherein the cooling jacket 102 is communicated with a cooling liquid inlet 103 and a cooling liquid outlet 104; the liquid outlet of the freezing crystallizer 5 is communicated with the inlet pipeline of the clear liquid tank 13, the outlet of the clear liquid tank 13 is communicated with the inlet pipeline of the clear liquid pump 14, and the outlet of the clear liquid pump 14 is communicated with the cooling liquid inlet 103. The clear liquid pump 14 pumps the low-temperature clear liquid in the clear liquid tank 13 to the freezing and crystallizing tank 1 for heat exchange and temperature rise and then discharges the clear liquid, the energy of the system is fully utilized in the process, the primary temperature reduction and crystallization of the waste water are efficiently realized, and meanwhile, the temperature of the discharged clear liquid is also raised, so that the overall energy consumption is reduced. In order to fully realize the crystal formation by freezing crystallization, the clear liquid discharged from the cooling liquid outlet 104 is provided with 2 paths, one path is directly discharged out of the system through the discharge pipe 15, and the other path is returned back to the freezing crystallization tank 1 through the return pipe 16 and flows through the whole freezing crystallization system again.
The outlet of the mother liquid pump 9 is communicated with the inlet of the freezing discharge pump 10 through a bypass pipe 19, and a bypass control valve 20 is arranged on the bypass pipe 19; partial mother liquor pumped by the mother liquor pump 9 is sent to an inlet of the freezing discharging pump 10, and the effect is to mix the mother liquor with the discharged material, so that the solid content is reduced, and the blockage of a discharging pipeline is prevented.
Example 2: the overall structure of the freezing and crystallizing tank 1 is the same as that of the embodiment 1, except that, as shown in fig. 2 and 3, the freezing and crystallizing tank 1 comprises a tank body 101, a freezing jacket 105 and a cooling jacket 102 are arranged outside the tank body 101, the freezing jacket 105 is communicated with a refrigerating fluid inlet 106 and a refrigerating fluid outlet 107, and the cooling jacket 102 is communicated with a cooling fluid inlet 103 and a cooling fluid outlet 104. In this embodiment, the jacket of the freezing and crystallizing tank 1 is divided into two parts, which are sequentially the clear liquid pumped from the clear liquid pump 14, and the freezing liquid pumped from the freezing unit is arranged on the other side; after the sodium sulfate freezing waste water enters the tank body 101 from the water inlet pipe 6, the temperature is reduced to below 33 ℃ through heat exchange with freezing liquid and clear liquid in the jacket, and partial crystallization salt is precipitated due to the temperature reduction. The refrigerating fluid cooling jacket is added, so that the refrigerating temperature in the refrigerating crystallization tank 1 can be more accurately controlled.
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; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The freezing crystallization system is characterized by comprising a freezing crystallization tank, a separation device, a mother liquor tank, a freezing heat exchanger and a freezing crystallizer, wherein the outlet of a water inlet pipe is communicated with a liquid inlet pipeline at the top of the freezing crystallization tank; an outlet of the mother liquor tank is communicated with an inlet pipeline of a mother liquor pump, an outlet of the mother liquor pump is communicated with an inlet pipeline of the freezing heat exchanger, and an outlet of the freezing heat exchanger is communicated with an inlet pipeline of the freezing crystallizer; the outlet of the freezing crystallizer is communicated with the inlet of a freezing circulating pump, the outlet of the freezing circulating pump is divided into two paths, one path is communicated with the inlet of the freezing heat exchanger through a pipeline, and the other path is communicated with the inlet of a freezing discharging pump through a pipeline; the outlet of the freezing discharge pump is communicated with an inlet pipeline of a second cyclone separator, the discharge port of the second cyclone separator is communicated with the inlet of the separation device, and the discharge port of the separation device is communicated with the inlet of the centrifugal machine.
2. The system for freeze crystallization of claim 1, wherein the freeze crystallization tank comprises a tank body and a cooling jacket disposed outside the tank body, the cooling jacket being in communication with a cooling fluid inlet and a cooling fluid outlet.
3. The system for freezing crystallization of claim 1, wherein the freezing crystallization tank comprises a tank body, a freezing jacket and a cooling jacket are arranged outside the tank body, a freezing liquid inlet and a freezing liquid outlet are communicated on the freezing jacket, and a cooling liquid inlet and a cooling liquid outlet are communicated on the cooling jacket.
4. The system as claimed in claim 2 or 3, wherein the liquid outlet of the freezing crystallizer is communicated with the inlet pipeline of a clear liquid tank, the outlet of the clear liquid tank is communicated with the inlet pipeline of a clear liquid pump, and the outlet of the clear liquid pump is communicated with the cooling liquid inlet pipeline.
5. The system for freezing crystallization of claim 4, wherein the outlet of the cooling liquid is divided into two paths, one path is communicated with the external discharge pipe, and the other path is communicated with the inside of the freezing crystallization tank through a return pipe; an outer discharge control valve is arranged on the outer discharge pipe, and a backflow control valve is arranged on the backflow pipe.
6. The freeze crystallization system of claim 1, 2, 3 or 5 wherein the outlet of the mother liquor pump communicates with the inlet of the freeze draw pump through a bypass line on which a bypass control valve is mounted.
7. The system of claim 4, wherein the outlet of the mother liquor pump communicates with the inlet of the refrigerated discharge pump through a bypass line, and a bypass control valve is mounted on the bypass line.
8. A freeze crystallization system as claimed in claim 1, 2, 3, 5 or 7 wherein the liquid outlet of the first cyclone, the liquid outlet of the second cyclone and the liquid outlet of the centrifuge are all in communication with the inlet line of the mother liquor tank.
9. The system of claim 4, wherein the liquid outlet of the first cyclone, the liquid outlet of the second cyclone and the liquid outlet of the centrifuge are all in communication with an inlet line of the mother liquor tank.
10. The system of claim 6, wherein the liquid outlet of the first cyclone, the liquid outlet of the second cyclone and the liquid outlet of the centrifuge are all in communication with an inlet line of the mother liquor tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122054274.7U CN216092310U (en) | 2021-08-27 | 2021-08-27 | Freezing crystallization system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122054274.7U CN216092310U (en) | 2021-08-27 | 2021-08-27 | Freezing crystallization system |
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| Publication Number | Publication Date |
|---|---|
| CN216092310U true CN216092310U (en) | 2022-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122054274.7U Active CN216092310U (en) | 2021-08-27 | 2021-08-27 | Freezing crystallization system |
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| CN (1) | CN216092310U (en) |
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2021
- 2021-08-27 CN CN202122054274.7U patent/CN216092310U/en active Active
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