CN212024792U - Sodium chloride crystallized salt system - Google Patents
Sodium chloride crystallized salt system Download PDFInfo
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- CN212024792U CN212024792U CN202020262425.0U CN202020262425U CN212024792U CN 212024792 U CN212024792 U CN 212024792U CN 202020262425 U CN202020262425 U CN 202020262425U CN 212024792 U CN212024792 U CN 212024792U
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Abstract
The utility model discloses a sodium chloride salt crystallization system, which comprises a flash evaporator, a first-effect evaporation unit, a second-effect evaporation unit, a vacuum tank, a swirler, a centrifuge and salt legs; the liquid phase outlet of the flash evaporator is connected with the liquid phase inlet of the first-effect separation chamber of the first-effect evaporation unit, and the liquid phase outlet of the first-effect separation chamber is connected with the liquid phase inlet of the second-effect separation chamber of the second-effect evaporation unit. A strong brine flushing pipe injects a strand of strong brine into the salt leg to flush the impurities deposited at the bottom upwards, so that the aim of elutriating the solid-liquid mixed product is fulfilled, the content of the impurities in the solid-liquid mixed product is reduced, the content of sodium chloride in the final product is improved, and the quality of the sodium chloride is further improved; and discharging the miscellaneous brine from the liquid phase outlet of the double-effect separation chamber to a vacuum tank so as to reduce the content of impurities in the double-effect separation chamber and further reduce the content of impurities in a solid-liquid mixed product in a salt leg.
Description
The technical field is as follows:
the utility model relates to a sodium salt production field, concretely relates to sodium chloride crystallization salt system.
Background art:
the mixed salt evaporation crystallization device comprises a flash evaporator, a first-effect evaporation unit, a cyclone, a centrifuge and a mother liquor tank, wherein in the production process, strong brine is sent into the flash evaporator 1 for storage and then sent into the first-effect evaporation unit for evaporation and then further concentrated, steam generated by the first-effect evaporation unit is sent into a heater of the second-effect evaporation unit, the strong brine discharged from the first-effect evaporation unit enters the second-effect evaporation unit, after evaporation of the second-effect evaporation unit, mixed salt is deposited at the bottom of a second-effect separation chamber of the second-effect evaporation unit and then discharged into the cyclone, solid-liquid separation of a solid-liquid mixed product is carried out through the cyclone, sodium chloride solid is sent into the centrifuge, the strong brine is sent into the second-effect separation chamber of the second-effect evaporation unit for continuous evaporation, after further solid-liquid separation through the centrifuge, the separated mother liquor is sent into the mother liquor tank for storage, and the wet salt is sent to a drying system for further treatment.
Because the mixed salt evaporative crystallization device has low requirements on the product quality in the original design, after salt separation production is carried out, the indexes of the sodium chloride product produced by the equipment do not reach the qualified level all the time, and the following problems are found after the production process is analyzed:
1. most impurities are deposited at the lower part of a double-effect separation chamber of the double-effect evaporation unit and are conveyed together when the double-effect separation chamber conveys materials to a hydrocyclone separator, so that the content of sodium chloride in the produced sodium chloride product is reduced, and the index of the sodium chloride product is seriously influenced
2. The centrifuge does not push materials, so that the sodium chloride solution cannot be subjected to solid-liquid separation, and finally the index moisture of the sodium chloride product exceeds the standard;
3. the central cross section of the first-effect separation chamber of the first-effect evaporation unit and the central cross section of the second-effect separation chamber of the second-effect evaporation unit are at the same height, but the size of the first-effect separation chamber is smaller, and a filter pipeline between the first-effect separation chamber and the second-effect separation chamber is often blocked, so that the concentrated brine is not smoothly fed, and the solid content in the first-effect evaporation unit is high.
The utility model has the following contents:
an object of the utility model is to provide a improve sodium chloride crystal salt system of sodium chloride crystal salt quality.
The utility model discloses by following technical scheme implement:
a sodium chloride salt crystallization system comprises a flash evaporator, a primary effect evaporation unit, a secondary effect evaporation unit, a vacuum tank, a cyclone, a centrifugal machine and salt legs;
a liquid phase outlet of the flash evaporator is connected with a liquid phase inlet of a primary-effect separation chamber of the primary-effect evaporation unit, and a liquid phase outlet of the primary-effect separation chamber is connected with a liquid phase inlet of a secondary-effect separation chamber of the secondary-effect evaporation unit;
a salt leg is arranged at the bottom of the two-effect separation chamber and is communicated with the two-effect separation chamber, a strong brine flushing pipe is arranged at the bottom of the salt leg, a discharge hole is arranged at the side part of the salt leg, and the discharge hole of the salt leg is connected with a feed hole of the swirler;
a liquid phase outlet of the cyclone is connected with a liquid phase inlet of the two-effect separation chamber, a solid phase outlet of the cyclone is connected with a feed inlet of the centrifuge, a liquid phase outlet of the centrifuge is connected with a liquid phase inlet of the flash evaporator, and a solid phase outlet of the centrifuge is connected with a drying system;
and a liquid phase outlet of the two-effect separation chamber is connected with a feed inlet of the vacuum tank, and a discharge outlet of the vacuum tank is connected with a waste salt treatment system.
Preferably, the central cross-section of the primary separation chamber is 1 meter higher than the vertical distance between the central cross-sections of the secondary separation chambers.
Preferably, the centrifuge is a spiral screen centrifuge.
The utility model has the advantages that:
1. the liquid phase outlet of the double-effect separation chamber is connected with the feed inlet of the vacuum tank, and the discharge outlet of the vacuum tank is connected with the waste salt treatment system. A strong brine flushing pipe injects a strand of strong brine into the salt leg to flush the impurities deposited at the bottom upwards, so that the aim of elutriating the solid-liquid mixed product is fulfilled, the content of the impurities in the solid-liquid mixed product is reduced, the content of sodium chloride in the final product is improved, and the quality of the sodium chloride is further improved; and discharging the miscellaneous brine from the liquid phase outlet of the double-effect separation chamber to a vacuum tank so as to reduce the content of impurities in the double-effect separation chamber and further reduce the content of impurities in a solid-liquid mixed product in a salt leg.
2. The centrifuge is a spiral screen type centrifuge, changes of solid content of feeding materials are adapted by controlling the feeding amount and adjusting the rotating speed and the differential speed of the centrifuge, and the problems that the centrifuge is diluted due to fluctuation of the solid content of the feeding materials of the centrifuge and the like are solved.
3. Improve 1 meter with the whole upwards of first effect separator chamber, when the strong brine is sent to the second effect separator chamber in first effect separator chamber, utilize gravity to improve conveying efficiency, avoid the filter tube to block up.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention;
figure 2 is a schematic view of the connection of the salt legs to the two-effect separation chamber of the present invention.
In the figure: the device comprises a flash evaporator 1, a primary-effect evaporation unit 2, a primary-effect separation chamber 2.1, a secondary-effect evaporation unit 3, a secondary-effect separation chamber 3.1, a vacuum tank 4, a cyclone 5, a centrifugal machine 6, salt legs 7, a strong brine flushing pipe 7.1 and a discharge hole 7.2.
The specific implementation mode is as follows:
as shown in fig. 1 and fig. 2, a sodium chloride crystallized salt system comprises a flash evaporator 1, a single-effect evaporation unit 2, a double-effect evaporation unit 3, a vacuum tank 4, a cyclone 5, a centrifuge 6 and a salt leg 7;
a liquid phase outlet of the flash evaporator 1 is connected with a liquid phase inlet of a first-effect separation chamber 2.1 of the first-effect evaporation unit 2, and a liquid phase outlet of the first-effect separation chamber 2.1 is connected with a liquid phase inlet of a second-effect separation chamber 3.1 of the second-effect evaporation unit 3;
a salt leg 7 is arranged at the bottom of the two-effect separation chamber 3.1, the salt leg 7 is communicated with the two-effect separation chamber 3.1, a strong brine flushing pipe 7.1 is arranged at the bottom of the salt leg 7, a discharge hole 7.2 is arranged at the side part of the salt leg 7, and the discharge hole 7.2 of the salt leg 7 is connected with a feed inlet of the cyclone 5;
a liquid phase outlet of the cyclone 5 is connected with a liquid phase inlet of the two-effect separation chamber 3.1, a solid phase outlet of the cyclone 5 is connected with a feed inlet of the centrifuge 6, a liquid phase outlet of the centrifuge 6 is connected with a liquid phase inlet of the flash evaporator 1, and a solid phase outlet of the centrifuge 6 is connected with the drying system;
the liquid phase outlet of the double-effect separation chamber 3.1 is connected with the feed inlet of the vacuum tank 4, and the discharge outlet of the vacuum tank 4 is connected with a waste salt treatment system.
The concentrated brine enters a flash evaporator 1 for storage, then is sent to a first-effect separation chamber 2.1 of a first-effect evaporation unit 2, is further concentrated after being evaporated by the first-effect evaporation unit 2, the steam generated by the first-effect evaporation unit 2 is sent to a heater of a second-effect evaporation unit 3, the concentrated brine discharged from the first-effect separation chamber 2.1 enters a second-effect separation chamber 3.1 of the second-effect evaporation unit 3, after being evaporated by the second-effect evaporation unit 3, a solid-liquid mixed product is deposited in a salt leg 7 at the bottom of the second-effect separation chamber 3.1, the solid-liquid mixed product is discharged into a swirler 5 through the salt leg 7, the solid-liquid mixed product is subjected to solid-liquid separation through the swirler 5, wherein sodium chloride crystalline solid is sent to a centrifuge 6, the concentrated brine is sent to the second-effect separation chamber 3.1 of the second-effect evaporation unit 3 for continuous evaporation, after being further subjected to solid-liquid separation through the centrifuge 6, the sodium chloride solid is sent to a, the strong brine generated after the centrifugation of the centrifuge 6 is sent to the flash evaporator 1 for storage;
when sodium chloride is deposited in the salt leg 7 at the bottom of the two-effect separation chamber 3.1, impurities in the strong brine are deposited together, a strand of strong brine is injected into the salt leg 7 through the strong brine flushing pipe 7.1, the impurities deposited at the bottom are flushed upwards, insoluble substances are washed, and because sodium chloride crystals in the solid-liquid mixed product are in a saturated state, the impurities are flushed into the two-effect separation chamber 3.1 after the strong brine is injected, the sodium chloride crystals are not affected, the purpose of washing the solid-liquid mixed product is achieved, the content of the impurities in the solid-liquid mixed product is reduced, the content of the sodium chloride in the final product is improved, and the quality of the sodium chloride is further improved;
in the production process, the more impurities in the double-effect separation chamber 3.1 are accumulated, the impurity salt water can be discharged from the liquid phase outlet of the double-effect separation chamber 3.1 to reduce the impurity content in the double-effect separation chamber 3.1, and further reduce the impurity content in the solid-liquid mixed product deposited in the salt leg 7, and as the whole evaporation process of the double-effect evaporation unit 3 is a vacuum environment, the vacuum tank 4 is connected with the liquid phase outlet of the double-effect separation chamber 3.1, so that the normal operation of the system is ensured.
The vertical distance between the central cross section of the first-effect separation chamber 2.1 is 1 meter higher than that between the central cross sections of the second-effect separation chamber 3.1, and when the first-effect separation chamber 2.1 sends strong brine to the second-effect separation chamber 3.1, the conveying efficiency is improved by utilizing gravity, and the blockage of a filter pipeline is avoided.
The centrifuge 6 is a spiral screen type centrifuge 6, the spiral screen type centrifuge 6 has the advantages of large adaptation range of the solid content of the fed material, small civil load, small vibration, low water content of filter cakes, small solid content of filtrate and the like, the variation of the solid content of the fed material is adapted by controlling the feeding amount and adjusting the rotating speed and the differential speed of the centrifuge 6, and the problems that the centrifuge 6 is subjected to dilution and the like due to the fluctuation of the solid content of the fed material of the centrifuge 6 are solved.
Meanwhile, the swirler 5 is replaced by the FXDS200-S swirler, the caliber of an inlet and an outlet of the swirler 5 is reduced, the output is consistent, and the normal operation is ensured.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A sodium chloride crystallized salt system, characterized by: comprises a flash evaporator, a first-effect evaporation unit, a second-effect evaporation unit, a vacuum tank, a swirler, a centrifuge and salt legs;
a liquid phase outlet of the flash evaporator is connected with a liquid phase inlet of a primary-effect separation chamber of the primary-effect evaporation unit, and a liquid phase outlet of the primary-effect separation chamber is connected with a liquid phase inlet of a secondary-effect separation chamber of the secondary-effect evaporation unit;
a salt leg is arranged at the bottom of the two-effect separation chamber and is communicated with the two-effect separation chamber, a strong brine flushing pipe is arranged at the bottom of the salt leg, a discharge hole is arranged at the side part of the salt leg, and the discharge hole of the salt leg is connected with a feed hole of the swirler;
a liquid phase outlet of the cyclone is connected with a liquid phase inlet of the two-effect separation chamber, a solid phase outlet of the cyclone is connected with a feed inlet of the centrifuge, a liquid phase outlet of the centrifuge is connected with a liquid phase inlet of the flash evaporator, and a solid phase outlet of the centrifuge is connected with a drying system;
and a liquid phase outlet of the two-effect separation chamber is connected with a feed inlet of the vacuum tank, and a discharge outlet of the vacuum tank is connected with a waste salt treatment system.
2. A sodium chloride crystalline salt system as claimed in claim 1, wherein: the central cross section of the first-effect separation chamber is 1 meter higher than the vertical distance between the central cross sections of the second-effect separation chambers.
3. A sodium chloride crystalline salt system according to claim 1 or 2 wherein: the centrifuge is a spiral screen centrifuge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020262425.0U CN212024792U (en) | 2020-03-05 | 2020-03-05 | Sodium chloride crystallized salt system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020262425.0U CN212024792U (en) | 2020-03-05 | 2020-03-05 | Sodium chloride crystallized salt system |
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| CN212024792U true CN212024792U (en) | 2020-11-27 |
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| CN202020262425.0U Active CN212024792U (en) | 2020-03-05 | 2020-03-05 | Sodium chloride crystallized salt system |
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